阅读说明：本技术 一种数显尺子制造方法及产品 (Digital display ruler manufacturing method and product ) 是由 严超 于 2019-11-28 设计创作，主要内容包括：本发明提供一种数显尺子制造方法及产品包括：(1)紧实绕卷尺带到尺带轮上并获取尺带最外圈半径R；(2)获取尺带单层厚度d；(3)检测尺带轮转动角度数据θ；(4)尺带释放长度L与以上3个数值的关系如下：利用本方法制造数显尺子产品,所需传感器数量少,结构简单,实施简单,生产简单,准确度高,成本低廉。(The invention provides a digital display ruler manufacturing methodThe method and the product comprise: (1) tightly winding the tape measure belt onto the tape measure belt wheel and obtaining the radius R of the outermost circle of the tape measure belt; (2) obtaining the single-layer thickness d of the tape; (3) detecting the rotation angle data theta of the belt wheel of the ruler; (4) the tape release length L is related to the above 3 values as follows: the digital display ruler product manufactured by the method has the advantages of small number of required sensors, simple structure, simple implementation, simple production, high accuracy and low cost.)

1. A method of manufacturing a digital ruler, comprising:

(1) tightly winding the tape measure belt onto the tape measure belt wheel and obtaining the radius R of the outermost circle of the tape measure belt;

(2) obtaining the single-layer thickness d of the tape;

(3) detecting the rotation angle data theta of the belt wheel of the ruler;

(4) the tape release length L is related to the above 3 values as follows:

description of the calculation formula:representing a number in a symbol down-integer; { } denotes the fraction part of the number in the symbol after the fraction point only; here, theTaking an integer downwards;taking a decimal part after the decimal point; l is the release length of the tape; theta represents the rotation angle degree of the tape wheel; pi is the circumference ratio; r is the tape outermost peripheral radius; d is the thickness of a single layer of the tape.

2. The method for manufacturing the digital display ruler according to claim 1, wherein there are a plurality of methods for obtaining the outermost radius of the ruler tape: directly measuring the diameter D of the outermost circle of the tape after winding is finished, and dividing the diameter D by 2, wherein the radius R of the outermost circle of the tape is equal to the radius D of the outermost circle of the tape divided by 2; and counting the number K of the tape winding layers after the winding is finished, wherein under the condition that the tape single-layer thickness d is obtained, the radius R of the outermost circle of the tape is the sum of the radius H of the tape wheel at the tape winding position and the product of the tape single-layer thickness d multiplied by the tape layer number K, and the radius R of the outermost circle of the tape is equal to the radius H of the tape wheel plus the tape single-layer thickness d multiplied by the tape winding layer number K.

3. The manufacturing method of the digital display ruler according to claim 1, wherein there are a plurality of methods for obtaining the single-layer thickness of the ruler tape:

directly measuring the single-layer thickness value d of the tape;

after the ruler belt is overlapped in multiple layers, measuring the total thickness value of the ruler belt in multiple layers and dividing the value by the number K of layers;

subtracting the radius value H of the outside of the tape wheel by the radius R of the outermost circle of the tape coil, and then dividing by the number of layers K.

4. The method for manufacturing the digital display ruler according to claim 1, wherein in the steps (1) and (2), the outermost circle radius R and the thickness value d of the single layer of the ruler tape can be reversely calculated by measuring the rotation angle theta of the two groups of ruler belt wheels and the release length L of the ruler tape and using the relation of the parameters in the step (4) to form a binary primary function group.

5. The method for manufacturing the digital display ruler according to claim 1, wherein in the steps (1) and (2), the outermost circle radius value R and the ruler single-layer thickness value d can be further defined by: and (4) measuring the rotation angle theta of the belt wheel of a large number of sets of measuring tapes and the release length L of the tape, taking the data relation in the step (4) as a function model, and fitting the function to obtain the measuring tape.

6. The method for manufacturing the digital display ruler according to claim 1, wherein in the steps (1) and (2), the outermost circle radius value R and the ruler single-layer thickness value d can be further defined by: and (4) measuring the signal number S of the angle sensor and the tape release length L when a large number of groups of tape reels rotate, taking the data relation in the step (4) as a function model, and obtaining the signal number through fitting a function.

7. The manufacturing method of the digital display ruler according to claim 1, wherein the data of the rotation angle of the ruler belt wheel is obtained by connecting and installing an angle sensor on the ruler belt wheel and detecting the rotation angle of the ruler belt wheel by the angle sensor; the angle sensor is a mouse encoder, a capacitive grating rotary encoder, a photoelectric encoder and a Hall angle sensor.

8. The method for manufacturing a digital display ruler according to claim 1, wherein the tape length calculating method is variable in the relation:wherein M is the value of the resolution of the angle sensor, the variable S is the number of signals detected by rotation, and pi is the circumferential ratio; r is the outermost radius of the tape; d is the single-layer thickness of the tape; note the bookB ═ pi × d, the simplified relationship is:

because each parameter in the L relational expression has different expression forms, the corresponding L relational expression also has a plurality of expression forms; other variants of the L relation are also within the scope of the invention.

9. A digital display ruler product comprises a shell, a central shaft, a ruler belt, a clockwork spring, a ruler belt wheel, an angle sensor, a circuit board, a processor, a display screen and a power supply; the circuit board and the processor are respectively electrically connected with the angle sensor, the display screen and the power supply; one end of the clockwork spring is fixedly arranged on the central shaft, and the other end of the clockwork spring is fixedly arranged on the ruler belt wheel; the tape wheel is arranged on the central shaft and can rotate by taking the central shaft as the center; the ruler belt is fixed and wound on the ruler belt wheel; the tape can be pulled out to drive the tape wheel to rotate, the clockwork spring is driven to tighten when the tape wheel rotates, when the tape is loosened, the clockwork spring drives the tape wheel to reversely rewind and rotate due to the self-stretching elasticity, and the tape wheel reversely rewinds and rotates, so that the tape pulled out in front is rewound on the tape wheel; the ruler belt wheel is provided with an angle sensor for measuring the rotation angle of the ruler belt wheel; the processor is used for processing the rotating angle data of the tape wheel to obtain the length value of the tape release and sending the result to the display screen. The digital display ruler is characterized in that the processor adopts the manufacturing method of the digital display ruler.

10. The digital display ruler product of claim 4, wherein the digital display ruler product is a tape measure, a girth ruler, a head circumference ruler, or a measuring cap ruler.

Technical Field

The invention relates to a measuring ruler neighborhood, in particular to a digital display ruler manufacturing method and a product.

Background

In daily life, tape measures, girth scales, head girth scales and measuring cap scales are widely used. Some of these rulers are not electronic digital display, and the reading is not convenient enough; some are electronic digital displays, but the structure is complex and the manufacturing cost is high.

Chinese patent documents disclose:

a multifunctional digital display tape measure (94110610.1) is composed of mechanical drive control unit, sensor unit, special IC module, display driver circuit, display, etc. The mechanical transmission control unit adopts a ruler belt to drive a friction wheel to rotate by utilizing friction force or adopts a ruler belt with a through hole matched with a barbed gear for transmission, so that the length pulled out of the ruler belt is converted into an electric signal by a sensing unit, and the electric signal is processed and then displayed in a digital mode to measure the length. The friction wheel is inaccurate in transmission measurement result, and the mechanical transmission mode of the tape band makes the structure more complex and the size larger; second, the correlation calculation method is not described.

The digital display tape measure of the dual sensor (03250083.1), it includes tape cassette, clockwork spring, one-chip computer, display unit installed in outer cover, also include the contact code wheel sensor made up of code wheel and electric brush with multiple feet, the surface of code wheel shows multiple code tracks made up of circulating code, the code wheel is fixed in outer cover, one end of the electric brush is fixed on terminal surface of the tape cassette, the foot of the electric brush contacts with elastic of code wheel; still including setting up the photoelectric sensor in the shell: the installation positions of the light-emitting diode and the photoelectric receiver are opposite to the scale belt scale surface, and black error trimming stripes are marked on the scale belt scale surface. In the scheme, 2 sensors are required to be used, black error trimming stripes of tape printing marks are required, the size is large, the process is complicated and complicated, and the cost is high; second, the correlation calculation method is not described.

The capacitance grid type digital display tape measure (200320102400.0) comprises a shell (1), a spring box (2), a spring (8) and a tape (7), and is characterized in that a rotating device is arranged in the shell (1), a movable grid (4) of a capacitance grid sensor is arranged on the rotating device, and a fixed grid (5) of the capacitance grid sensor is arranged at a fixed position opposite to the movable grid (4); the output signal of the capacitive grating sensor is sequentially input into a special analog-to-digital conversion chip, a singlechip (9) and a display (3) arranged on the shell (1). In this scheme, a calculation method of an analog-to-digital conversion chip is not given.

The digital display tape measure (201710653123.9) comprises a shell, a tape and a tape box, wherein a scroll is arranged in the shell, the tape box is arranged on the scroll to rotate, the tape is wound on the tape box, and a hook is arranged at the front end of the tape; the ruler tape is characterized by further comprising a grid disc, a grid detector, a circuit board and a display screen, wherein the grid disc is fixed on the ruler tape box and rotates, a circle of grids are arranged on the circumference of the grid disc, the grid detector generates a detection signal of the rotation of the grid disc through the rotation of the grid disc and the grids, the length of the ruler tape drawn out is obtained through the calculation of the circuit board by utilizing the detection signal, and the length is displayed on the display screen; the tape is drawn out from the zero position for the nth circle, namely the grating disk is turned to the nth circle, the grating detector detects that the number of corresponding gratings on the grating disk is M, the number of corresponding gratings of each circle of the grating disk is S, the length of the tape in the 1 st circle is L1, the length of the tape in the 2 nd circle is L2, and so on, so that the drawn length of the tape is obtained: L-L1 + L2 … … + L (n-1) + (Ln/S M)

Wherein, every circle that the chi area was drawn out is the measurement storage in advance, for known length, only needs the number of turns and the grid that detects the grid dish and is located at present through the grid detector, just can directly calculate the result with above-mentioned formula. The scheme needs to detect the number of grid rotation turns and the number of grids, and needs 2 parameter detection points which are too many for detecting the 2 parameters; in the scheme, the length value of each circle of tape needs to be built, the memory of the chip is various, and in the scheme, the current grid detector detects that the number of the corresponding grids on the grid disc is M, the number of the corresponding grids of each circle of the grid disc is S, so that the scheme is ambiguous and has no clear meaning; the sensors in the scheme have no directivity, and only can record an addition signal and cannot record a subtraction signal.

A capacitive grating type digital display tape measure (201711173101.9), the description of which records the tape length acquisition principle, comprises the steps of measuring a length value corresponding to tape expansion according to every N pitch angles by a factory calibration mode, storing every N pitch angles of a capacitive grating sensor and the length value of the tape expansion into a single chip microcomputer in a one-to-one correspondence mode, and forming electronic digital scales of the tape in the single chip microcomputer; the scheme has the advantages of complex and difficult operation of accurate acquisition of the electronic digital scales and large memory capacity of the chip.

Disclosure of Invention

In summary, in order to overcome the defects that the prior art requires a plurality of sensors, the calculation method is not recorded or complicated, the product structure is complicated, and the implementation is not easy, the invention provides a digital display ruler manufacturing method and a product, wherein the invention explicitly describes the principle of a calculation relational expression and the calculation method, can detect the rotation angle data theta of the belt wheel of the ruler by using only one angle sensor, and can accurately, simply and conveniently calculate the length value L released by the ruler belt by using the relational expression; the whole body only adopts one sensor, so that the product structure can be simplified.

In order to solve the problems, the invention adopts the following technical scheme:

a method of manufacturing a digital ruler, comprising:

(1) tightly winding the tape measure belt onto the tape measure belt wheel and obtaining the radius R of the outermost circle of the tape measure belt;

(2) obtaining the single-layer thickness d of the tape;

(3) detecting the rotation angle data theta of the belt wheel of the ruler;

(4) the tape release length L is related to the above 3 data as follows:

description of the relation:indicating that the numbers in the symbols are integers down, the decimal places after the decimal place are ignored,down to integers, x representing a number in parentheses, e.g.{ } denotes the number in the symbol as a decimal fraction after the decimal point, ignoring integers before the decimal point, { x } denotes the fractional part after the decimal point, x denotes a number in parentheses, for example, {5.6} -, 0.6, {8.2} -, or0.2; here, theDown-taking an integer, representingDown-sampling the integer values;taking the decimal part after the decimal point to representTaking the decimal part after the decimal point as the result of (1); l is the release length of the tape; theta represents the rotation angle degree of the tape wheel, 360 degrees is obtained after one rotation, and 360 degrees is obtained after one and half rotations3600 degrees after 10 turns, the tape is released and pulled out, the tape wheel synchronously rotates, the theta value is increased by a corresponding angle, the tape is contracted and rewound, and the theta value is reduced by a corresponding angle; pi is the circumference ratio; r is the tape outermost peripheral radius; d is the single-layer thickness of the tape; when the R value and the d value are obtained, only the theta value is monitored, and the tape release length value can be calculated and displayed in real time through the relation.

In the scheme (1), the tape is tightly wound on the tape wheel, so that the wound tape can be similar in shape of each layer, and convenience is provided for later mathematical modeling; the radius of the outermost circle of the tape can be obtained by a plurality of methods:

directly measuring the diameter D of the outermost circle of the tape after winding is finished, and dividing the diameter D by 2, wherein the radius R of the outermost circle of the tape is equal to the radius D of the outermost circle of the tape divided by 2;

and counting the number K of the tape winding layers after the winding is finished, wherein under the condition that the tape single-layer thickness d is obtained, the radius R of the outermost circle of the tape is the sum of the radius H of the tape wheel at the tape winding position and the product of the tape single-layer thickness d multiplied by the tape layer number K, and the radius R of the outermost circle of the tape is equal to the radius H of the tape wheel plus the tape single-layer thickness d multiplied by the tape winding layer number K.

In the above scheme (2), there may be a plurality of measuring methods for obtaining the single-layer thickness of the blade:

directly measuring the single-layer thickness value d of the tape;

after the ruler belt is overlapped in multiple layers, measuring the total thickness value of the ruler belt in multiple layers and dividing the value by the number K of layers;

subtracting the value H of the radius outside the belt wheel of the ruler from the radius R of the outermost ring of the ruler belt coil, and then dividing the value by the number K of layers;

in the above schemes (1) and (2), the R and d values can also be calculated by measuring two sets of data of the rotation angle θ of the tape wheel and the release length L of the tape, where the rotation angle θ of one tape wheel and the release length L of one tape are a set of data, measuring two sets of such data, and using the relation of the data in (4) to form a binary primary function set, and calculating the R and d values in the following way:

firstly, keeping the tape tightly wound on the tape wheel, drawing the tape by a first length, and measuring the drawn length value L of the tape_aAnd measuring the rotation angle theta of the belt wheel of the ruler_a(ii) a Similarly, the tape is drawn out for a second length, and the length L of the tape drawn out is measured_bAnd measuring the rotation angle theta of the belt wheel of the ruler_b；

② measuring the length value L of the tape_aAngle of rotation theta of tape-and-reel_aSubstituting into the relation formula to obtain:measuring the length L of the tape_bAngle of rotation theta of tape-and-reel_bSubstituting into the relation formula to obtain:

and combining the two relational expressions into a linear equation system of two-dimensional equations, and solving the equations to obtain the radius R of the outermost circle of the measuring tape and the thickness value d of the single layer of the measuring tape.

In the above schemes (1) and (2), the values of R and d may also be determined by: measuring a plurality of sets of data of the rotation angle theta of the tape wheel of the number tape and the release length L of the tape, wherein the rotation angle theta value of one tape wheel and the release length L value of one tape are taken as a set of data, and measuring a plurality of sets of data; or by: measuring data of the number S of angle sensor signals driven by a large number of groups of ruler belt wheels to rotate and the release length L of the ruler belt, wherein the number S of angle sensor signals driven by one ruler belt wheel to rotate and the release length L of the ruler belt are a group of data, and measuring a large number of groups of data; then, taking the data relation in the step (4) as a function model, and fitting by using a fitting function to obtain an R value and a d value; the fitting function method for obtaining the R value and the d value can increase the closeness of the L value calculated by the model and the actual value of the tape, can better reduce the simulation deviation of the model and the measurement deviation in the previous obtaining methods, and is a better R value and d value obtaining method.

In the scheme (3), the ruler belt wheel is wound with the ruler belt, and the ruler belt wheel is driven to rotate in the drawing and contraction processes; the angle sensor is a component for detecting the rotation angle, can detect and identify the rotation direction, and can be a mouse encoder, a capacitive grating rotary encoder, a photoelectric encoder, a Hall angle sensor and the like; an angle sensor for detecting the rotation angle is arranged on the ruler belt wheel, and an induction part of the angle sensor and the ruler belt wheel synchronously rotate so as to detect the rotation angle of the ruler belt wheel; detecting the rotation angle data of the belt wheel of the ruler in real time; when the tape is pulled out, the number of signals is increased, and the rotation angle theta of the tape pulley is synchronously increased; when the tape is contracted and rewound, the number of signals is reduced, and the rotation angle theta of the tape pulley is synchronously reduced; the tape length value L is calculated using the current tape pulley angle value theta.

In the above scheme (4), a mathematical model is established and the derivation principle is as follows according to the relation between the tape release length L and the outermost circle radius R, the tape single layer thickness d and the tape wheel rotation angle data theta:

FIG. 2 is a cross-sectional trace of the blade; as shown in fig. 2, the tape is wound on the tape wheel in a circle, and the tape has a convex deformation at the transition point crossing into another layer in the process of winding from the inner layer to the outer layer, although the tape has the convex deformation, because the thickness of the tape is thinner and the tape wheel at the center is in a perfect circle shape, the cross section track of the tape winding still presents a highly approximate perfect circle shape; each turn of the tape is simulated here as a perfect circle, as shown in figure 3,the dotted line part is the part of the perfect circle model simulation; FIG. 4 is a simplified right circular model, as shown in FIG. 4, since the tape has its own thickness, the radius of each turn is the radius of the outer circle of each layer of tape, as shown in FIG. 4, from the outer circle to the inner circle, 1 st turn Q₁Here, get r₁Is the radius; 2 nd circle Q₂Here, get r₂Is the radius; analogizing in turn, the number of turns from the outer ring to the inner ring is n-1_n-1Here, get r_n-1Is the radius; n-th circle Q_nHere, get r_nIs the radius; n is the number of sequencing turns from the outer ring to the inner ring, and n is a natural number; r is the outermost radius of the tape, the 1 st turn Q of the outermost turn₁Get r₁Is a radius, so R ═ R₁(ii) a The tape wheel is arranged on the central shaft, the tape wheel is driven to rotate by taking the central shaft as the center in the process of pulling the tape out, the angle sensor detects the rotating circumferential angle theta of the tape wheel in real time, the tape which is wound starts to be released from the outermost circle, and the length of the released tape corresponds to the rotating circumferential angle theta of the tape wheel; the tape release may or may not be a full turn, and the corresponding circumferential angle is divided into two parts, a full turn circumferential angle and a non-full turn circumferential angle, the full turn partial circumferential angle being marked as theta₁Wherein theta₁The circumferential angle, which may be 0, 1 or more turns, ending with a non-complete turn, is marked theta₂，θ₁+θ₂θ; the tape release length is marked L corresponding to a number of complete turns of the partial circumferential angle theta₁The tape release length of (1) is marked as L₁Corresponding to a circumferential angle theta ending in a non-complete number of turns₂The tape release length of (1) is marked as L₂，L₁+L₂L; wherein L is₁The sum of the length of each full turn released for the tape; the thickness of the single layer of the tape is consistent, the thickness value is marked as d, and the difference of the radiuses between adjacent layers is the thickness value d of the single layer of the tape;the number in the symbol is expressed as a downward integer, and the decimal after the decimal point is ignored; { } represents that the number in the symbol only takes the decimal after the decimal point, and ignores the integer before the decimal point; a complete circle is 360 degrees andit can be understood that 360-degree equal divisions or 360-arc equal divisions are made on a circle, different angle sensors have different resolutions, the resolution of the circle of some angle sensors is 1200 equal divisions, and the resolution of some angle sensors is only 24 equal divisions, here we take the angle as a unit, the 360-degree angles of the circle are taken as unity, so the unit of theta is degree; markingIs N, i.e. corresponding to L released by the tape₁Integer number of turns of circumferential angle theta₁The N value is the whole circle number released by the tape, and can be 0 circle, 1 circle, 2 circles or more;taking the decimal part after the decimal point for the calculation result in the bracket, namely corresponding to the tail section of tape release not a whole circle of the circumferential angle theta₂A moiety; the circumference of each circle is marked as C, Q₁A circumference of C₁，Q₂A circumference of C₂，Q₃A circumference of C₃By analogy, Q_n-1A circumference of C_n-1，Q_nA circumference of C_nAnd pi is the circumference ratio;

the number of turns from the outer ring of the tape coil to the inner ring,

1 st turn, r₁＝R-0×d，C₁＝2×π×r₁＝2×π×(R-0×d)；

2 nd turn, r₂＝R-1×d，C₂＝2×π×r₂＝2×π×(R-1×d)；

Loop 3, r₃＝R-2×d，C₃＝2×π×r₃＝2×π×(R-2×d)；

4 th turn, r₄＝R-3×d，C₄＝2×π×r₄＝2×π×(R-3×d)；

N-1 th turn, r_N-1＝R-(N-2)×d，C_N-1＝2×π×r_N-1＝2×π×[R-(N-2)×d]；

N th turn, r_N＝R-(N-1)×d，C_N＝2×π×r_N＝2×π×[R-(N-1)×d]；

N +1 th turn, r_N+1＝R-N×d，C_N+1＝2×π×r_N+1＝2×π×[R-N×d]；

L₁＝C₁+C₂+C₃+C₄+···+C_N-1+C_N＝2×π×(R-0×d)+2×π×(R-1×d)+2×π×(R-2×d)+…+2×π×[R-(N-2)×d]+2×π×[R-(N-1)×d]＝2×π×R×N-π×d×(N²-N)

The foregoing marksWhereinAccording to the initial definition of the two terms

In actual production, the detected rotation angle is actually the number of signals generated during rotation detection, the number of the signals is marked as a letter S, the number of the signals is added when the signals are pulled out, the rotation angle theta is synchronously increased, the number of the signals is reduced when the signals are contracted and rewound, and the rotation angle theta is synchronously reduced; since the angular sensors of different types may also have different peripheral resolutions, the peripheral resolution of the angular sensor is recorded as M, which is the number of signals that can be recognized and acquired by the angular sensor for a complete circle, and can be understood as a circleDividing the circumference angle into M equal parts or dividing the circumference angle into M equal arc sections, wherein each signal corresponds toAngle of circle center, so corresponding to the rotation angle of the tape wheel

It is known thatSubstitution into

The variable relation can be obtained:

description of the relation: the value of the resolution of the angle sensor is a constant M, and the number of signals detected by rotation is a variable S;

in practical use, in combination with the above variation, since pi, R, M, d are known constantsOnly one known constant, denoted a,pi × d also represents only one constant, denoted as B, where B is pi × d; the relation can be further simplified as:wherein A and B are constants, and M is the resolution value of the angle sensor;

because the radius R of the outermost ring of the tape, the thickness d of a single layer of the tape, the value H of the outer radius of the tape wheel and the number K of the tape winding layers also have corresponding mathematical relations, the value R and the value d respectively have various expression forms, and the expression forms are substituted into the relational expression of R, d, theta and L, so that the relational expression also has various variable expression forms, and the detailed description is omitted.

The invention also discloses a digital display ruler product, which comprises a shell, a central shaft, a ruler belt, a clockwork spring, a ruler belt wheel, an angle sensor, a circuit board, a processor, a display screen and a power supply, wherein the central shaft is arranged on the shell; the circuit board and the processor are respectively electrically connected with the angle sensor, the display screen and the power supply; one end of the clockwork spring is fixedly arranged on the central shaft, and the other end of the clockwork spring is fixedly arranged on the ruler belt wheel; the tape wheel is arranged on the central shaft and can rotate by taking the central shaft as the center; the ruler belt is fixed and wound on the ruler belt wheel; the tape can be pulled out to drive the tape wheel to rotate, the clockwork spring is driven to tighten when the tape wheel rotates, when the tape is loosened, the clockwork spring drives the tape wheel to reversely rewind and rotate due to the self-stretching elasticity, and the tape wheel reversely rewinds and rotates, so that the tape pulled out in front is rewound on the tape wheel; the ruler belt wheel is provided with an angle sensor for measuring the rotation angle of the ruler belt wheel; the processor adopts the manufacturing method of the digital display ruler, stores the calculation relational expression of the outermost radius value R of the ruler tape coil, the single-layer thickness value d of the ruler tape and the length L of the ruler tape which are measured in advanceThe processor calculates the length value of the tape according to the angle value detected by the angle sensor, and sends the result to the display screen.

The invention also discloses a digital display ruler product, and the processor adopts the digital display ruler manufacturing method to store the calculation relational expression of the ruler tape coil outermost radius value R, the ruler tape single-layer thickness value d, the angle sensor peripheral resolution M and the ruler tape length L which are measured in advanceThe processor calculates the length value L of the tape release according to the number S of the signals detected by the angle sensor, and sends the result to the display screen;

the invention also discloses a digital display ruler product, the processor adopts the manufacturing method of the digital display ruler to store the A value which is calculated in advance,b, B pi x d and M24, and calculating a relation corresponding to the tape length LThe processor calculates the length value L of the tape release according to the number S of the signals detected by the mouse encoder, and sends the result to the display screen;

the invention has the advantages that the release length value of the tape can be calculated by only adopting one angle sensor and detecting the rotation angle of the tape wheel of the tape, the implementation of the technical scheme is simple, the tape printing is not required, the number of the sensors can be reduced, the product mechanism is simplified, the production process is simplified, the production efficiency is improved, the product cost is reduced, and the tape can be widely applied to products such as a tape measure, a waist tape, a head tape, a measuring cap tape and the like.

Drawings

The invention is further illustrated by the following figures and examples.

FIG. 1 is a diagram of the manufacturing process of the digital ruler.

FIG. 2 is a blade path diagram showing the blade cross-sectional path winding pattern and the blade path.

FIG. 3 is a simulation diagram of a perfect circle model of the tape track, showing the relationship between the perfect circle model and the tape track.

FIG. 4 is a right circular model of the tape, with various parameters.

FIG. 5 is an exploded view of the tape wheel and corresponding mouse encoder, in this embodiment, the angle sensor employs a mouse encoder.

FIG. 6 is a ruler-on-wheel mouse encoder installation versus bitmap, in this embodiment, the angle sensor employs a mouse encoder.

FIG. 7 is a profile of a digital ruler product, in this embodiment, the angle sensor is a mouse encoder.

FIG. 8 is a right side sectional view of a digital display ruler product, in this embodiment, the angle sensor is a mouse encoder.

FIG. 9 is a circumference ruler diagram of a digital display ruler product.

From the outer ring toInner circle number, 1 st circle number Q₁The radius of the outer ring is r₁(ii) a Circle 2 is marked Q₂The radius of the outer ring is r₂(ii) a The 3 rd circle is marked as Q₃The radius of the outer ring is r₃(ii) a By analogy, the n-1 th circle is Q_n-1The radius of the outer ring is r_n-1(ii) a The n-th turn is Q_nThe radius of the outer ring is r_n(ii) a D is the diameter of the outermost periphery of the blade coil, R is the radius of the outermost periphery of the blade coil, D is the thickness of a single layer, and H is the radius of the blade pulley, which is here the innermost circle of the blade coil and also the minimum radius of the blade coil.

The ruler tape 10, the ruler tape winding layer bulge 11, the ruler tape model line 12, the ruler tape wheel 20, the transmission shaft 21 of the ruler tape wheel, the central shaft 22, the mouse encoder 30, the central hole 31 of the mouse encoder, the shell 40, the ruler tape head 41, the display screen 50, the circuit board 60, the processor 70, the clockwork spring 80 and the power supply 90.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and the present invention includes the embodiments herein but is not limited to the embodiments herein.

Example one

Referring to fig. 1, a method for manufacturing a digital ruler includes:

(1) tightly winding the tape measure belt onto the tape measure belt wheel and obtaining the radius R of the outermost circle of the tape measure belt;

(2) obtaining the single-layer thickness d of the tape;

(3) detecting the rotation angle data theta of the belt wheel of the ruler;

(4) the tape release length L is related to the above 3 data as follows:

description of the relation:it is shown that numbers in the symbols are integers downwards, the decimal after the decimal point is ignored,down to integers, x representing a number in parentheses, e.g.{ } denotes a number in a symbol which is a decimal after a decimal point, and omits an integer before the decimal point, { x } which is a decimal part after the decimal point, and x denotes a number in parentheses, for example, {5.6} ═ 0.6, {8.2} ═ 0.2, {12.0} -, 0; here, theDown-taking an integer, representingDown-sampling the integer values;taking the decimal part after the decimal point to representTaking the decimal part after the decimal point as the result of (1); l is the release length of the tape; theta is the rotation angle of the tape wheel; pi is the circumference ratio; r is the radius of the outermost circle of the tape; d is the single-layer thickness of the tape; when the R value and the d value are obtained, only the theta value is monitored, and the tape release length value can be calculated and displayed in real time through the relation.

In item (1) of the first embodiment, as shown in FIG. 2, the tape is tightly wound on the tape wheel, so that the wound tape can be similar in shape of each layer, and later mathematical modeling is facilitated;

the radius R of the outermost circle of the tape can be obtained by a plurality of methods:

directly measuring the outer diameter D of the outermost circle of the tape after winding is finished, and dividing the diameter D by 2, wherein the radius R of the outermost circle of the tape is equal to the radius D of the outermost circle of the tape divided by 2; for example, in fig. 2, the diameter D is measured as 36mm, and the radius R as 36mm 2 as 18 mm;

and counting the number K of the tape winding layers after the winding is finished, wherein under the condition that the tape single-layer thickness d is obtained, the radius R of the outermost circle of the tape is the sum of the radius H of the tape wheel at the tape winding position and the product of the tape single-layer thickness d multiplied by the tape layer number K, and the radius R of the outermost circle of the tape is equal to the radius H of the tape wheel plus the tape single-layer thickness d multiplied by the tape winding layer number K. For example, in fig. 2, the radius H of the tape reel at the position where the tape is wound is 13.2mm, the thickness d of a single layer is 0.3mm, the number K of tape winding layers is 16, and the radius R of the outermost tape turn is 13.2+0.3 × 16, which is 18 mm.

In item (2) of the first embodiment, there may be a plurality of measurement methods for obtaining the thickness of the single layer:

directly measuring a single-layer thickness value d; the thickness d is measured directly as 0.3 mm.

After the ruler belt is overlapped in multiple layers, measuring the total thickness value of the ruler belt in multiple layers and dividing the value by the number K of layers; for example, the folding tape has 8 layers thick, where K is 8, and the total thickness of the 8 layers is 2.4mm, so the single layer thickness value d is 2.4 mm/layer number 8 is 0.3 mm.

Subtracting the value H of the radius outside the belt wheel of the ruler from the radius R of the outermost ring of the ruler belt coil, and then dividing the value by the number K of layers; as shown in FIG. 2, the radius R of the outermost circle of the tape is 18mm, the value H of the outer radius of the tape wheel is 13.2mm, the number K of the tape winding layers is 16, and the thickness of the single layer is measured

In the first embodiment (1) and (2), the R and d values can also be calculated by measuring two sets of the tape pulley rotation angle θ and the tape release length L, where one set of the tape pulley rotation angle θ and one set of the tape release length L are taken as a set of data, taking two sets of such data, and using the relationship of the data in (4) to calculate in reverse, as follows:

firstly, keeping the tape tightly wound on the tape wheel, drawing the tape by a first length, and measuring the drawn length value L of the tape_aAnd measuring the rotation angle theta of the belt wheel of the ruler_aWhere L is measured_a＝950mm，θ_a3240 degrees; similarly, the tape is drawn out for a second length, and the length L of the tape drawn out is measured_bAnd measuring the rotation angle theta of the belt wheel of the ruler_bWhere L is measured_b＝1190.42，θ_b4155 degrees;

② measuring the length value L of the tape_aAngle of rotation theta of tape-and-reel_aSubstituting into the relation formula to obtain:

measuring the length L of the tape_bAngle of rotation theta of tape-and-reel_bSubstituting into the relation formula to obtain:

combining the two relational expressions into a linear equation set of two-dimensional equations, solving the equations to obtain the radius R of the outermost circle of the measuring tape and the thickness value d of the single layer of the measuring tape; two relationships are obtained here:

wherein pi is 3.1415926, solving the equation set of equations of this binary system to get R18 mm, d 0.3 mm.

In the first embodiment (3), the tape winding belt is wound on the tape wheel, and the tape wheel is driven to rotate in the process of pulling out and retracting; an angle sensor for detecting the rotation angle is arranged on the ruler belt wheel, and an induction part of the angle sensor and the ruler belt wheel rotate synchronously so as to detect the rotation angle of the ruler belt wheel in real time; the angle sensor can detect and identify the rotating direction; the angle sensor can be a mouse encoder, a capacitive grating rotary encoder, a photoelectric encoder, a Hall angle sensor and other principles; as in fig. 5, here the angle sensor is a mouse encoder; in FIG. 5, the drive shaft on the tape reel is inserted into the central hole attached to the mouse encoder; the rotation of the ruler belt wheel can drive the central hole of the mouse encoder to rotate, the central hole of the mouse encoder rotates, and the mouse encoder is mainly usedThe body does not rotate, so that the rotation angle of a central hole of the mouse encoder can be detected, the rotation angle of a transmission shaft of the tape wheel of the ruler can be detected, and the transmission shaft of the tape wheel of the ruler and the tape wheel of the ruler are integrated, so that the rotation angle theta of the tape wheel of the ruler can be detected; the precision of the common mouse encoder is 24 signal points in a circle, the circle is equally divided into 24 parts, and each part corresponds to an angle of 24The angle value measured by the mouse encoder is 15 degrees multiplied by the number of detected signals S, namely theta is 15 multiplied by the number of signals S; when the tape is pulled out, the signal number S is increased, and the rotation angle theta of the tape pulley is synchronously increased; when the tape is contracted and rewound, the signal number S is reduced, and the rotation angle theta of the tape pulley is synchronously reduced; the tape length value L is calculated using the current tape pulley angle value theta.

In example one (4), the relationship of tape release length L to outermost turn radius R, tape single layer thickness d, and tape wheel rotational angle data θ:

r-18 mm, d-0.3 mm, known as pi-3.1415926;

when the number of signals detected by the mouse encoder is 75, theta is 15 multiplied by 75 which is 1125,{3.125}＝0.125，

L＝2×3.1415926×18×3.125－3.1415926×0.3×(3²-3 +2 × 3 × 0.125) ═ 347.067 mm. This number 347.067mm is the amount of tape paid out.

When the number of signals detected by the mouse encoder is 103, theta is 15 multiplied by 103 to 1545,{4.2916}＝0.2916，

L＝2×3.1415926×18×4.2916－3.1415926×0.3×(4²－4+2×4×0.2916)＝471.860 mm. This number 471.860mm is the amount of tape paid out.

When the number of signals detected by the mouse encoder is 216, theta is 15 multiplied by 216 is 3240,{9}＝0，

L＝2×3.1415926×18×9－3.1415926×0.3×(9²-9 +2 × 9 × 0) ═ 950.018 mm. This number 950.018mm is the amount of tape paid out.

When the number of signals detected by the mouse encoder is 277, theta is 15 × 277 and 4155, {11.5416}＝0.5416，

L＝2×3.1415926×18×11.5416－3.1415926×0.3×(11²-11 +2 × 11 × 0.5416 ═ 1305.32418547776-114.902367044256 ═ 1190.422 mm. This number 1190.422mm is the amount of tape paid out.

In the above calculation method, since the R value and d can be obtained by measurement in advance, and pi is also a known constant, the length value L released by the tape can be calculated by detecting the variable value of the rotation angle theta of the tape wheel.

In actual production, the detected rotation angle is actually the number of signals generated during rotation detection, the number of the signals is marked as a letter S, the number of the signals is added when the signals are pulled out, the rotation angle theta is synchronously increased, the number of the signals is reduced when the signals are contracted and rewound, and the rotation angle theta is synchronously reduced; since the peripheral resolution may be different for different types of angle sensors, the peripheral resolution of the angle sensor is recorded as M, and the peripheral resolution is the number of signals that can be identified and acquired for a complete circle of the angle sensor, which can be understood as M equal divisions of a circle angle or M equal arcs of a circle angle, each signal corresponds toAngle of circle center, so corresponding to the rotation angle of the tape wheel

It is known thatSubstitution into

The variable relation can be obtained:

description of the relation: the value of the resolution of the angle sensor is a constant M, and the number of signals detected by rotation is a variable S;

in practical use, in combination with the above variation, since pi, R, M, d are known constantsOnly one known constant, denoted a,pi × d also represents only one constant, denoted as B, where B is pi × d; the relation can be further simplified as:wherein A and B are constants, and M is the resolution value of the angle sensor.

Where pi is 3.1415926, M is 24, R is 18mm, d is 0.3mm, and S is a signal value, the signal values are substituted into the relation L,

obtaining: B＝π×d＝0.94248,

go toThe method comprises the following steps:

when the number of signals detected by the mouse encoder is 75,{3.125}＝0.125，

L＝4.7124×75－0.94248×(3²-3 +2 × 3 × 0.125) ═ 347.07 mm. This number 347.07mm is the amount of tape paid out.

When the number of signals detected by the mouse encoder is 103,{4.2916}＝0.2916，

L＝4.7124×103－0.94248×(4²-4 +2 × 4 × 0.2916) ═ 471.86 mm. This number 471.86mm is the amount of tape paid out.

When the number of signals detected by the mouse encoder is 277,{11.5416}＝0.5416，

L＝4.7124×277－0.94248×(11²-11 +2 × 11 × 0.5416) ═ 1190.43 mm. This number 1190.43mm is the amount of tape paid out.

Example two

In a method for manufacturing a digital display ruler, a capacitive rotary encoder is used as an angle sensor, the minimum resolution is 0.5 degrees, the peripheral resolution M is 720 degrees, and according to the change relation of an L relation:

it is known that pi is 3.1416, R is 18mm, d is 0.3mm, S is the number of signals,

therefore, it is not only easy to use

Substituting known number to further obtain

EXAMPLE III

In the manufacturing method of the digital display ruler ((1) and (2), R and d values can also be obtained by measuring a large number of sets of data of the rotation angle theta of the ruler belt wheel and the release length L of the ruler belt, wherein the value of the rotation angle theta of the ruler belt wheel and the value of the release length L of the ruler belt are a set of data, and measuring a large number of sets of data, or by measuring the number S of angle sensor signals driven by the rotation of the large number of sets of ruler belt wheels and the data of the release length L of the ruler belt, wherein the value S of the angle sensor signals driven by the rotation of the ruler belt wheel and the value of the release length L of the ruler belt are a set of data, and then using the data relation in (4) as a function model and using a fitting function to fit and obtain the R value and the d value;

this embodiment employs measuring the angle sensor signal number S and tape release length L;

the relation of L, R, d, theta is according to

The variation relation is as follows:

in the relational expression, M is the resolution of the angle sensor, and S is the number of signals detected and obtained by the angle sensor;

in this embodiment, a photoelectric rotary encoder is used as an angle sensor, the resolution M is 600, and the number of signals is S;

and M is 600, and the following variable relations are substituted:

detecting the number S of signals of the photoelectric rotary encoder and measuring the length value L of the release of the corresponding tape, and acquiring a plurality of groups of data as follows:

using mathematical software MATLAB of MathWorks company in America to perform function fitting; the method specifically comprises the following steps:

taking data in the table as a column vector w and a column vector y respectively; the specific writing is as follows:

w＝[0；211；702；1087；1484；1910；2574；3342；3945；4622；5254；5588；6193；7162；7511；8225；8901]；

y＝[0；40；130；200；270；345；460；590；690；800；900；952；1045；1190；1241；1343；1437]；

② byAs a function model, where S is a variable, and R and d are coefficients;

fitting by using a fit function in MATLAB mathematical software, wherein fitting codes are as follows:

symsx

w＝[0；211；702；1087；1484；1910；2574；3342；3945；4622；5254；5588；6193；7162；7511；8225；8901]；

y＝[0；40；130；200；270；345；460；590；690；800；900；952；1045；1190；1241；1343；1437]；

f＝fittype('2.*pi.*R.*S/600-pi.*d.*(floor(S/600).*floor(S/600)-floor(S/600)+2.*floor(S/600).*((S/600)-floor(S/600)))','independent','S','coefficients',{'R','d'})

；

cfun＝fit(w,y,f)

wi＝0:500:10000；

yi＝cfun(wi)；

plot(w,y,'r*',wi,yi,'b-')；

coeffvalues(cfun)

the return result after running is:

wherein:

Coefficients(with95％confidencebounds):

R＝17.59(17.56,17.61)

d＝0.3139(0.3098,0.3181)

the fitted R and d values are shown in parentheses with 95% confidence limits.

ans-17.5864671226280360.313946731240338, i.e. increasing the number of display bits to 15, R-17.59 mm increasing the number of display bits to 17.586467122628036mm, d-0.3139 mm increasing the number of display bits to d-0.313946731240338 mm.

The fitting function method is used for obtaining the R value and the d value, so that the proximity between the L value calculated by the model and the actual value of the tape can be increased, the model simulation deviation and the measurement deviation in the previous obtaining methods can be better reduced, and the method is a better R value and d value obtaining method; this example is only for the convenience of better understanding, and does not exclude other better fitting methods, such as finding better model L values closer to the R and d values of the tape actual length value by using the fitting method.

Example four

A digital display ruler product, as shown in fig. 5, 6, 7 and 8, comprises a casing 40, a central shaft 22, a ruler tape 10, a clockwork spring 80, a ruler tape wheel 20, an angle sensor, a circuit board 60, a processor 70, a display screen 50 and a power supply 90; here, the angle sensor employs a mouse encoder 30; the circuit board 60 and the processor 70 are electrically connected with the mouse encoder 30, the display screen 50 and the power supply 90 respectively; one end of the spring 80 is fixed on the central shaft 22, and the other end is fixed on the ruler belt wheel 20; the tape pulley 20 is mounted on the central shaft 22, and the tape pulley 20 can rotate around the central shaft 22; the tape 10 is fixed and wound on the tape reel 20; when the tape 10 is pulled out, the tape wheel 20 can be driven to rotate, the clockwork spring 80 is driven to tighten when the tape wheel 20 rotates, when the tape 10 is loosened, the clockwork spring 80 drives the tape wheel 20 to reversely rewind and rotate due to self-stretching elasticity, and the tape wheel 20 reversely rewinds and rotates, so that the tape 10 pulled out in the front is rewound on the tape wheel 20; the ruler belt wheel 20 is provided with a mouse encoder 30 for measuring the rotation angle of the ruler belt wheel; the processor 70 stores the calculation methods of the outermost radius R, the single-layer thickness d and the length L of the measuring tape which are measured in advance by adopting the manufacturing method of the digital display ruler; the processor 70 calculates the length value L of the tape according to the angle value theta detected by the mouse encoder 30, and sends the result to the display screen 50; in this embodiment.

In a fifth embodiment, in a digital display ruler product, as shown in fig. 5, 6, 7, 8, the angle sensor employs a mouse encoder, the processor 70 employs the above digital display ruler manufacturing method, and the relational expression of the calculation of the outermost radius R of the tape roll, the single-layer thickness d of the tape, the peripheral resolution M of the mouse encoder, and the length L of the tape measured in advance is storedThe processor 70 calculates the length value L of tape release according to the number S of signals detected by the mouse encoder 30, and sends the result to the display screen 50;

sixth embodiment, in a digital ruler product, as shown in fig. 5, 6, 7, and 8, the angle sensor uses a mouse encoder, the processor 70 uses the above digital ruler manufacturing method, stores a previously calculated a value,b, B pi x d and M24, and calculating a relation corresponding to the tape length LThe processor 70 calculates the length value L of tape release according to the number S of signals detected by the mouse encoder 30, and sends the result to the display screen 50;

seventh embodiment, the angle sensor is a capacitive-grating rotary encoder of the capacitive principle.

In an eighth embodiment, the angle sensor is a photoelectric encoder based on photoelectric principle.

In a ninth embodiment, the angle sensor is a hall angle sensor based on the hall effect principle.

Example ten, as shown in fig. 9, the digital display ruler product is a girth ruler for measuring girth.