阅读说明：本技术 一种基于电机扭矩的恒张力控制系统 (Constant tension control system based on motor torque ) 是由 杨洁 于 2020-04-15 设计创作，主要内容包括：本发明公开了一种基于电机扭矩的恒张力控制系统,包括底箱,所述底箱的顶部固定连接有传送箱,所述传送箱内表面顶部的左侧转动连接有卷料卷筒,所述卷料卷筒中心轴的后端贯穿传送箱并延伸至传送箱的背面,本发明涉及激光打标设备技术领域。该基于电机扭矩的恒张力控制系统,通过设置编码器测量和计算卷料卷筒上卷料的剩余半径,利用该数据可控制伺服电机的转速,进而时卷料在拉出打印的全过程中,卷料的张紧力可保持恒定,可避免出现撕裂卷料的问题,且两个胶辊通过第一从动带轮、第二从动带轮与第二皮带的配合,可实现同步转动,可避免牵引力矩会成指数变化的问题,省去了后期调节的麻烦,还能及时报警提示更换卷料。(The invention discloses a constant tension control system based on motor torque, which comprises a bottom box, wherein the top of the bottom box is fixedly connected with a conveying box, the left side of the top of the inner surface of the conveying box is rotatably connected with a coil winding drum, and the rear end of a central shaft of the coil winding drum penetrates through the conveying box and extends to the back of the conveying box. This permanent tension control system based on motor torque, through setting up the surplus radius of coil stock on the encoder measurement and the calculation coil stock reel, utilize this steerable servo motor's of data rotational speed, and then the coil stock is at the overall process that pulls out the printing during, the tensile force of coil stock can keep invariable, can avoid appearing tearing the problem of coil stock, and two rubber rolls are through first driven pulleys, the cooperation of second driven pulleys and second belt, can realize synchronous rotation, can avoid traction torque can become index change's problem, the trouble of later stage regulation has been saved, can also in time report to the police and indicate to change the coil stock.)

1. The utility model provides a constant tension control system based on motor moment of torsion, includes under casing (1), the top fixedly connected with transmission case (2) of under casing (1), its characterized in that: the left side at conveying case (2) internal surface top is rotated and is connected with coil stock reel (3), the rear end of coil stock reel (3) center pin runs through conveying case (2) and extends to the back of conveying case (2), and the rear end fixedly connected with first band pulley (4) of coil stock reel (3) center pin, the back of conveying case (2) just is located below fixedly connected with mount (5) of first band pulley (4), the positive fixedly connected with encoder (6) of mount (5), the rear end fixedly connected with belt lace wheel of encoder (6) pivot, and be connected through first belt (7) transmission between the surface of first band pulley (4) and belt lace wheel, from left to right rotate in proper order between the front and back both sides of conveying case (2) inner wall and be connected with first rubber roll (8) and second rubber roll (9), the rear end of first rubber roll (8) and second rubber roll (9) all runs through conveying case (2) and extends to the back of conveying case (2) The back, and the rear end of first rubber roll (8) and second rubber roll (9) is fixedly connected with first driven band pulley (10) and second driven band pulley (11) respectively, and passes through second belt (12) transmission connection between the surface of first driven band pulley (10) and second driven band pulley (11).

2. A motor torque based constant tension control system as claimed in claim 1, wherein: the rear side fixedly connected with servo motor (13) of transfer case (2) inner wall, the rear end of servo motor (13) output shaft runs through transfer case (2) and extends to the back of transfer case (2), and the rear end of servo motor (13) output shaft passes through torque sensor fixedly connected with driving pulley (14).

3. A motor torque based constant tension control system as claimed in claim 2, wherein: the second driven belt wheel (11) is a double-groove belt wheel, and the surface of a clamping groove at the front side of the second driven belt wheel (11) is in transmission connection with the surface of the driving belt wheel (14) through a third belt (15).

4. A motor torque based constant tension control system as claimed in claim 1, wherein: the back of the conveying box (2) and the inner side of the second belt (12) are connected with a tensioning wheel mechanism (16) in a sliding mode, and the surface of the tensioning wheel in the tensioning wheel mechanism (16) is connected with the bottom of the upper half portion of the second belt (12) in a rolling mode.

5. A motor torque based constant tension control system as claimed in claim 1, wherein: the middle fixedly connected with translucent cover (17) at conveying case (2) top, fixedly connected with fall way (18) between the right side at translucent cover (17) and conveying case (2) top, sliding connection has sliding sleeve (19) between both sides around fall way (18), fall way (18) are run through on the right side of sliding sleeve (19), and both sides all offer spout (20) with sliding sleeve (19) looks adaptation around fall way (18).

6. The motor torque based constant tension control system of claim 5, wherein: the elevator is characterized in that a screw rod (21) is rotatably connected between the upper side and the lower side of the inner surface of the elevator tube (18), the right side of a sliding sleeve (19) is located on an inner fixedly connected threaded sleeve (22) of the elevator tube (18), the inner surface of the threaded sleeve (22) is in threaded connection with the surface of the screw rod (21), the top end of the screw rod (21) penetrates through the top end of the elevator tube (18) and extends to the upper side of the elevator tube (18), and a hand wheel (23) is fixedly connected to the top end of the screw rod (21).

7. The motor torque based constant tension control system of claim 5, wherein: the top of sliding sleeve (19) just is located left side fixedly connected with bracket (24) of fall way (18), and the inside fixedly connected with electric telescopic handle (25) of bracket (24), the front end fixedly connected with laser marking machine (26) of electric telescopic handle (25), just be located the left and right sides under laser marking machine (26) laser head between the front and back both sides of translucent cover (17) inner wall and all rotate and be connected with directive wheel (27), and the surface of coil stock on coil stock reel (3) is connected with the surface transmission of second rubber roll (9), directive wheel (27) and first rubber roll (8) in proper order.

8. A motor torque based constant tension control system as claimed in claim 1, wherein: the coil stock export has been seted up on the right side of conveying case (2), below fixedly connected with play work or material rest (28) that just is located the coil stock export between the right side of conveying case (2) and the top of under casing (1), the right front side fixedly connected with start button (29) at under casing (1) top, the positive below of conveying case (2) articulates there is guide chamber door (30).

9. A motor torque based constant tension control system as claimed in any one of claims 1 to 8, wherein: the constant tension control system based on the motor torque is applied to the laser marking industry.

10. A motor torque based constant tension control system as claimed in any of claims 1 to 8, wherein: the operation method comprises the following steps:

the method comprises the following steps: firstly, shaking a hand wheel (23) to enable a screw rod (21) to rotate, further driving a sliding sleeve (19) to ascend by utilizing a threaded sleeve (22), further driving an electric telescopic rod (25) and a laser marking machine (26) to ascend through a bracket (24), then pulling out printing paper on the surface of a coil winding drum (3), then opening a guide box door (30), stretching a hand into a conveying box (2) from the position of the guide box door (30) or from the upper part, sequentially passing the printing paper through a second rubber roller (9), a steering wheel (27) and a first rubber roller (8) until pulling out from a coil outlet, then closing the guide box door (30), and then reversely shaking the hand wheel (23) to descend the electric telescopic rod (25) and the laser marking machine (26) to the original height;

step two: during printing, the encoder (6), the servo motor (13), the torque sensor, the electric telescopic rod (25) and the laser marking machine (26) are connected with the same computer and a starting button (29), the starting button (29) is connected into a main circuit, a constant torque value T of the servo motor (13) is set on the computer, equipment is started to work through the starting button (29), the servo motor (13) drives a driving belt wheel (14) to rotate, a third belt (15) is used for driving a second driven belt wheel (11) to rotate, a second rubber roller (9) is further rotated, meanwhile, a second belt (12) is used for driving a first driven belt wheel (10) to rotate, a first rubber roller (8) is made to rotate synchronously, a roll material is pulled out, meanwhile, the electric telescopic rod (25) controls the laser marking machine (26) to move back and forth, and back, and forth, and laser printing is carried out on the roll material by the laser marking machine (26;

step three: in the printing process, the coil stock is pulled out, and coil stock reel (3) drive first band pulley (4) and rotate to utilize first belt (7) to drive the axle of encoder (6) and rotate, encoder (6) are counted, and with data transmission to computer, calculate the angular velocity of current coil stock through encoder (6) feedback and be:

V＝(N1–N2)/t；

wherein N1 is the value of the current encoder (6), N2 is the value of the last encoder (6), t is the time interval of two acquisitions, and then the residual radius of the current coil stock is calculated as:

R＝S/V；

wherein S is the linear velocity of the first belt wheel (4), is a system given value, when the residual radius of the coil stock approaches 0, namely the coil stock is about to be used up, the system warns, and when the diameter of the coil stock changes, the speed of the servo motor (13) controlled by the computer changes according to the diameter of the coil stock, and the tension of the whole system is kept constant.

Technical Field

The invention relates to the technical field of laser marking equipment, in particular to a constant tension control system based on motor torque.

Background

The laser marking technology is one of the largest application fields of laser processing, and the laser marking is a marking method which utilizes high-energy-density laser to locally irradiate a workpiece to enable a surface layer material to be vaporized or to generate a chemical reaction with color change so as to leave a permanent mark. The laser marking can print various characters, symbols, patterns and the like, and the size of the characters can be from millimeter to micron, which has special significance for the anti-counterfeiting of products. The laser marking is characterized by non-contact processing, can mark on any special-shaped surface, does not deform and generate internal stress on a workpiece, and is suitable for marking materials such as metal, plastic, glass, ceramic, wood, leather and the like. The laser can mark almost all parts (such as piston, piston ring, valve seat, hardware tool, sanitary ware, electronic component, etc.), and mark wear-resisting, and the production technology easily realizes the automation, and the part deformation that is marked is little.

The current situation is as follows: in the traditional control system of laser nameplate marking, there are two solutions: 1, the driving feeding shaft keeps constant-speed feeding, the driven shaft is unpowered, and the driven shaft is driven to feed materials; and 2, feeding the driving shaft and the driven shaft at the same angular speed. The first system has the inevitable defects that in the process of feeding by the driving wheel, because the feeding resistance of the driven wheel is constant, when the coiled materials are changed from big to small, the traction torque can be changed exponentially, so that the reverse torque of the driven wheel needs to be manually adjusted for a period of time; and the second method adopts the driving wheel and the driven wheel to rotate and feed at the same angular speed all the time, so that the linear speed can be changed in the process of changing the diameter of the roll material, and the famous brand paper can be tensioned and snapped.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a constant tension control system based on motor torque, which solves the problem that in the process of feeding by adopting a driving wheel, because the feeding resistance of a driven wheel is constant, when a coil material is changed from big to small, the traction torque can be changed exponentially, so that the reverse torque of the driven wheel needs to be manually adjusted within a period of time; the driving wheel and the driven wheel are adopted to rotate at the same angular speed for feeding, so that the linear speed can be changed in the process of changing the diameter of a roll, and the famous brand paper can be tensioned and snapped.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a constant tension control system based on motor torque comprises a bottom box, wherein a conveying box is fixedly connected to the top of the bottom box, a coil winding drum is connected to the left side of the top of the inner surface of the conveying box in a rotating mode, the rear end of a central shaft of the coil winding drum penetrates through the conveying box and extends to the back of the conveying box, a first belt wheel is fixedly connected to the rear end of the central shaft of the coil winding drum, a fixing frame is fixedly connected to the back of the conveying box and is located below the first belt wheel, an encoder is fixedly connected to the front side of the fixing frame, a small belt wheel is fixedly connected to the rear end of a rotating shaft of the encoder, the first belt wheel is in transmission connection with the surface of the small belt wheel through a first belt, a first rubber roller and a second rubber roller are sequentially connected between the front side and the rear side of the inner wall of the conveying box in a rotating mode from left to right, and the rear ends of the first rubber roller and the second rubber roller are respectively and fixedly connected with a first driven belt wheel and a second driven belt wheel, and the surfaces of the first driven belt wheel and the second driven belt wheel are in transmission connection through a second belt.

Preferably, the rear side of the inner wall of the transmission box is fixedly connected with a servo motor, the rear end of an output shaft of the servo motor penetrates through the transmission box and extends to the back face of the transmission box, and the rear end of the output shaft of the servo motor is fixedly connected with a driving belt wheel through a torque sensor.

Preferably, the second driven pulley is a double-groove pulley, and the surface of a clamping groove at the front side of the second driven pulley is in transmission connection with the surface of the driving pulley through a third belt.

Preferably, a tensioning wheel mechanism is connected to the back of the conveying box and located on the inner side of the second belt in a sliding mode, and the surface of a tensioning wheel in the tensioning wheel mechanism is connected with the bottom of the upper half portion of the second belt in a rolling mode.

Preferably, the middle fixedly connected with translucent cover at conveying roof portion, fixedly connected with fall way between the right side at translucent cover and conveying roof portion, sliding connection has the sliding sleeve between the both sides around the fall way, the fall way is run through on the right side of sliding sleeve, and the spout with sliding sleeve looks adaptation is all seted up to both sides around the fall way.

Preferably, rotate between the upper and lower both sides of fall elevator pipe internal surface and be connected with the lead screw, the right side of sliding sleeve and the inside fixedly connected with thread bush that is located the fall elevator pipe, and the internal surface of thread bush and the surperficial threaded connection of lead screw, the top of lead screw runs through the top of fall elevator pipe and extends to the top of fall elevator pipe, and the top fixedly connected with hand wheel of lead screw.

Preferably, the top of sliding sleeve just is located the left side fixedly connected with bracket of fall way, and the inside fixedly connected with electric telescopic handle of bracket, electric telescopic handle's front end fixedly connected with laser marking machine, the left and right sides that just is located under the laser marking machine laser head between the front and back both sides of translucent cover inner wall all rotates and is connected with the directive wheel, and the surface of coil stock on the coil stock reel is connected with the surface transmission of second rubber roll, directive wheel and first rubber roll in proper order.

Preferably, the coil stock export has been seted up on the right side of conveying case, the below fixedly connected with play work or material rest that just is located the coil stock export between the right side of conveying case and the top of under casing, the right front side fixedly connected with start button at under casing top, the positive below of conveying case articulates there is the guide chamber door.

Preferably, the constant tension control system based on the motor torque is applied to the laser marking industry.

The invention also discloses an operation method of the constant tension control system based on the motor torque, which specifically comprises the following steps:

the method comprises the following steps: firstly, wave the hand wheel and make the lead screw rotate, and then utilize the thread bush to drive the sliding sleeve and rise, and then it rises with laser marking machine to drive electric telescopic handle through the bracket, then draw out the printing paper on coil stock reel surface, then open the guide chamber door, the hand is from guide chamber door department or stretch into the conveying incasement from the top, the guide is beaten printing paper and is passed the second rubber roll in proper order, directive wheel and first rubber roll, until drawing out from the coil stock export, then close the guide chamber door, reverse hand wheel of waveing again, descend electric telescopic handle and laser marking machine to original height.

Step two: when printing, the encoder, servo motor, torque sensor, same computer and start button are all connected to electric telescopic handle and laser marking machine, and insert the main circuit with start button, set up servo motor's invariable torque value T on the computer, through the work of start button starting equipment, servo motor drives the driving pulley and rotates, utilize the third belt to drive the rotation of second driven pulley, and then make the second rubber roll rotate, utilize the second belt to drive first driven pulley and rotate simultaneously, make first rubber roll synchronous rotation, pull out the coil stock, the back-and-forth movement of electric telescopic handle control laser marking machine simultaneously, laser marking machine carries out laser printing to the coil stock.

Step three: in the printing process, the coil stock is pulled out, and the coil stock reel drives first band pulley and rotates to utilize the axle of first belt drive encoder to rotate, the encoder counts, and with data transmission to computer, calculate the angular velocity of current coil stock through the encoder feedback and be:

V＝/t；

wherein N1 is the value of the current encoder, the last encoder value of N2, and t is the time interval between two acquisitions, and then the residual radius of the current coil stock is calculated as:

R＝S/V；

and when the diameter of the coil stock changes, the speed of the servo motor controlled by the computer changes according to the diameter of the coil stock in a self-adaptive manner, so that the tension of the whole system is kept constant.

(III) advantageous effects

The invention provides a constant tension control system based on motor torque. Compared with the prior art, the method has the following beneficial effects:

(1) this permanent tension control system based on motor torque, through the rear end at first rubber roll and second rubber roll respectively the first driven band pulley of fixedly connected with and the second driven band pulley, and connect through second belt drive between the surface of first driven band pulley and second driven band pulley, step three: in the printing process, the coil stock is pulled out, and the coil stock reel drives first band pulley and rotates to utilize the axle of first belt drive encoder to rotate, the encoder counts, and with data transmission to computer, calculate the angular velocity of current coil stock through the encoder feedback and be: v ═ t; wherein N1 is the value of the current encoder, the last encoder value of N2, and t is the time interval between two acquisitions, and then the residual radius of the current coil stock is calculated as: r is S/V; wherein S is the linear velocity of first band pulley, for the system setting value, the remaining radius at the coil stock approaches and 0, when the coil stock will be used up promptly, the system warns, and when the coil stock diameter changes, the speed of computer control servo motor can change according to coil stock diameter self-adaptation, keep entire system 'S tension invariable, measure and calculate the remaining radius of coil stock on the coil stock reel through setting up the encoder, utilize this data steerable servo motor' S rotational speed, and then the coil stock is in the overall process of pulling out the printing, the tensioning force of coil stock can keep invariable, can avoid appearing tearing the problem of coil stock, and two rubber rolls are through first driven pulley, the cooperation of second driven pulley and second belt, can realize synchronous rotation, can avoid the problem that traction torque can become exponential change, the trouble of later stage regulation has been saved, can also in time report to the police and indicate to change the coil stock.

(2) This permanent tension control system based on motor moment of torsion, through sliding connection with the sliding sleeve between the both sides around the fall way, the fall way is run through on the right side of sliding sleeve, and the spout with sliding sleeve looks adaptation is all seted up to both sides around the fall way, it is connected with the lead screw to rotate between the upper and lower both sides of fall way internal surface, the inside fixedly connected with thread bush that the right side of sliding sleeve just is located the fall way, and the internal surface of thread bush and the surface threaded connection of lead screw, the top of lead screw runs through the top of fall way and extends to the top of fall way, and the top fixedly connected with hand wheel of lead screw, the top of sliding sleeve just is located the left side fixedly connected with bracket of fall way, and the inside fixedly connected with electric telescopic handle of bracket, electric telescopic handle's front end fixedly connected with laser marking machine, the positive below of transfer box, Sliding sleeve and bracket make the manual rising that electric telescopic handle and laser marking machine can relax, and then make the top space of conveying case open, the cooperation guides the chamber door, and the coil stock is alternated in the guide that can be more convenient, convenient to use.

Drawings

FIG. 1 is a front view of the structure of the present invention;

FIG. 2 is a rear view of a partial structure of the present invention;

FIG. 3 is a rear view of the internal structure of the transfer box of the present invention;

fig. 4 is a top view of the internal structure of the elevator tube of the present invention.

In the figure, 1-a bottom box, 2-a conveying box, 3-a material winding drum, 4-a first belt wheel, 5-a fixing frame, 6-an encoder, 7-a first belt, 8-a first rubber roller, 9-a second rubber roller, 10-a first driven belt wheel, 11-a second driven belt wheel, 12-a second belt, 13-a servo motor, 14-a driving belt wheel and 15-a third belt, 16-tensioning wheel mechanism, 17-transparent cover, 18-lifting pipe, 19-sliding sleeve, 20-sliding chute, 21-screw rod, 22-thread sleeve, 23-hand wheel, 24-bracket, 25-electric telescopic rod, 26-laser marking machine, 27-steering wheel, 28-discharging frame, 29-starting button and 30-guiding box door.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, an embodiment of the present invention provides a technical solution: a constant tension control system based on motor torque comprises a bottom case 1, a conveying case 2 is fixedly connected to the top of the bottom case 1, a servo motor 13 is fixedly connected to the rear side of the inner wall of the conveying case 2, the rear end of an output shaft of the servo motor 13 penetrates through the conveying case 2 and extends to the back of the conveying case 2, a driving pulley 14 is fixedly connected to the rear end of an output shaft of the servo motor 13 through a torque sensor, a tensioning pulley mechanism 16 is slidably connected to the back of the conveying case 2 and located on the inner side of a second belt 12, the surface of the tensioning pulley in the tensioning pulley mechanism 16 is in rolling connection with the bottom of the upper half portion of the second belt 12, a transparent cover 17 is fixedly connected to the middle of the top of the conveying case 2, a lifting pipe 18 is fixedly connected between the transparent cover 17 and the right side of the top of the conveying case 2, a sliding sleeve 19 is slidably connected between the front side and the, the front side and the rear side of the lifting pipe 18 are respectively provided with a sliding groove 20 matched with the sliding sleeve 19, a screw rod 21 is rotatably connected between the upper side and the lower side of the inner surface of the lifting pipe 18, the right side of the sliding sleeve 19 is positioned in the lifting pipe 18, the inner surface of the screw sleeve 22 is in threaded connection with the surface of the screw rod 21, the top end of the screw rod 21 penetrates through the top end of the lifting pipe 18 and extends to the upper side of the lifting pipe 18, the top end of the screw rod 21 is fixedly connected with a hand wheel 23, the top of the sliding sleeve 19 is positioned on the left side of the lifting pipe 18 and is fixedly connected with a bracket 24, the inner part of the bracket 24 is fixedly connected with an electric telescopic rod 25, the front end of the electric telescopic rod 25 is fixedly connected with a laser marking machine 26, the left side and the right side between the front side and the rear side of the inner wall of the transparent cover 17 and, The turning wheel 27 is connected with the surface of the first rubber roller 8 in a transmission way, the right side of the conveying box 2 is provided with a coil outlet, a discharge frame 28 is fixedly connected between the right side of the conveying box 2 and the top of the bottom box 1 and positioned below the coil outlet, a start button 29 is fixedly connected on the right front side of the top of the bottom box 1, a guide box door 30 is hinged below the front side of the conveying box 2, a screw rod 21 is arranged to match with a thread sleeve 22, a sliding sleeve 19 and a bracket 24, so that an electric telescopic rod 25 and a laser marking machine 26 can be easily and manually lifted, the upper space of the conveying box 2 is opened, the guide box door 30 is matched to guide and insert coils more conveniently, the use is convenient, the left side of the top of the inner surface of the conveying box 2 is rotatably connected with a coil winding drum 3, the rear end of the central shaft of the coil winding drum 3 penetrates through the conveying box 2 and extends to the back of the conveying box 2, a fixed frame 5 is fixedly connected to the back of the conveying box 2 and below the first belt pulley 4, an encoder 6 is fixedly connected to the front of the fixed frame 5, a small belt pulley is fixedly connected to the rear end of a rotating shaft of the encoder 6, the first belt pulley 4 is in transmission connection with the surface of the small belt pulley through a first belt 7, a first rubber roller 8 and a second rubber roller 9 are sequentially connected between the front side and the rear side of the inner wall of the conveying box 2 in a rotating manner from left to right, a silica gel pressing shaft is further arranged between the front side and the rear side of the inner wall of the conveying box 2 and below the first rubber roller 8 and used for pressing the coil materials on the surface of the first rubber roller 8, the rear ends of the first rubber roller 8 and the second rubber roller 9 penetrate through the conveying box 2 and extend to the back of the conveying box 2, a first driven belt pulley 10 and a second driven belt pulley 11 are respectively and fixedly connected to the rear ends of the first rubber roller 8 and the second rubber roller 9, and the surfaces of, the second driven pulley 11 is a double-groove pulley, and the surface of the front clamping groove of the second driven pulley 11 is in transmission connection with the surface of the driving pulley 14 through a third belt 15.

The constant tension control system based on the motor torque is applied to the laser marking industry.

The invention also discloses an operation method of the constant tension control system based on the motor torque, which specifically comprises the following steps:

the method comprises the following steps: firstly, the hand wheel 23 is shaken to enable the screw rod 21 to rotate, then the threaded sleeve 22 is utilized to drive the sliding sleeve 19 to ascend, then the bracket 24 is used for driving the electric telescopic rod 25 and the laser marking machine 26 to ascend, then printing paper on the surface of the coil winding drum 3 is pulled out, then the guide box door 30 is opened, a hand stretches into the conveying box 2 from the guide box door 30 or from the upper side, the guide printing paper sequentially passes through the second rubber roller 9, the steering wheel 27 and the first rubber roller 8 until being pulled out from a coil outlet, then the guide box door 30 is closed, then the hand wheel 23 is shaken reversely, and the electric telescopic rod 25 and the laser marking machine 26 are descended to the original height.

Step two: during printing, the encoder 6, the servo motor 13, the torque sensor, the electric telescopic handle 25 and the laser marking machine 26 are connected with the same computer and the starting button 29, the starting button 29 is connected into the main circuit, the constant torque value T of the servo motor 13 is set on the computer, the equipment is started through the starting button 29 to work, the servo motor 13 drives the driving belt wheel 14 to rotate, the third belt 15 is used for driving the second driven belt wheel 11 to rotate, the second rubber roller 9 is further made to rotate, meanwhile, the second belt 12 is used for driving the first driven belt wheel 10 to rotate, the first rubber roller 8 is made to rotate synchronously, the coil stock is pulled out, meanwhile, the electric telescopic handle 25 controls the front and back movement of the laser marking machine 26, and the laser marking machine 26 performs laser printing on the coil stock.

Step three: in the printing process, the coil stock is pulled out, and coil stock reel 3 drives first pulley 4 and rotates to utilize first belt 7 to drive the axle of encoder 6 and rotate, encoder 6 counts, and with data transmission to computer, the angular velocity who calculates current coil stock through encoder 6 feedback is:

V＝N1–N2/t；

wherein N1 is the value of the current encoder 6, N2 is the value of the last encoder 6, t is the time interval between two acquisitions, and then the remaining radius of the current coil stock is calculated as:

R＝S/V；

wherein S is the linear speed of the first belt wheel 4, is a given value of the system, and is close to 0 when the residual radius of the coil stock is 0, namely, when the coil stock is used up, the system warns, and when the diameter of the coil stock changes, the speed of the servo motor 13 controlled by the computer changes according to the diameter of the coil stock, the tension of the whole system is kept constant, by means of the encoder 6, the remaining radius of the web on the web roll 3 is measured and calculated, with which the rotational speed of the servomotor 13 can be controlled, furthermore, the tension force of the coil stock can be kept constant in the whole process of pulling out the coil stock for printing, the problem of tearing the coil stock can be avoided, and the two rubber rollers are matched with a second belt 12 through a first driven belt wheel 10 and a second driven belt wheel 11, can realize synchronous rotation, can avoid pulling torque to become the problem of index change, save the trouble of later stage regulation, can also in time report to the police and indicate to change the coil stock.

And those not described in detail in this specification are well within the skill of those in the art.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.