阅读说明：本技术 缝纫机、布料撑开结构及其压力检测方法 (Sewing machine, cloth stretching structure and pressure detection method thereof ) 是由 陈汉杰 李斌斌 居尚 于 2021-08-10 设计创作，主要内容包括：本发明提供了一种缝纫机、布料撑开结构及其压力检测方法,布料撑开结构包括：第一布料撑开筒及第二布料撑开筒,之间放置有待扩张的布料,且第一布料撑开筒能够相对第二布料撑开筒移动；弹性件,一端固定,另一端为自由端；感应元件,包括相连接的固定部及感应部,固定部与第一布料撑开筒连接并跟随第一布料撑开筒移动,感应部与自由端连接,固定部移动时感应部拉伸弹性件,且感应部根据弹性件施加的反作用力以获取布料撑开的松紧度。第一布料撑开筒的移动量与弹性件的受到的拉伸力成正比以及布料的松紧度成正比,故通过感应元件检测弹性件的受到的拉伸力进而获取布料撑开的松紧度,解决了传统的人工调码方式容易产生误差的问题。(The invention provides a sewing machine, a cloth stretching structure and a pressure detection method thereof, wherein the cloth stretching structure comprises: the cloth to be expanded is placed between the first cloth expanding cylinder and the second cloth expanding cylinder, and the first cloth expanding cylinder can move relative to the second cloth expanding cylinder; one end of the elastic piece is fixed, and the other end of the elastic piece is a free end; the sensing element comprises a fixing part and a sensing part which are connected, the fixing part is connected with the first cloth opening barrel and moves along with the first cloth opening barrel, the sensing part is connected with the free end, the sensing part stretches the elastic piece when the fixing part moves, and the sensing part obtains the tightness of the cloth opening according to the counterforce applied by the elastic piece. The amount of movement of a section of thick bamboo is propped open to first cloth is directly proportional with the tensile force that receives of elastic component and the elasticity of cloth is directly proportional, so detect the tensile force that receives of elastic component and then acquire the elasticity that the cloth propped open through sensing element, solved the easy production error's of traditional manual code mode of transferring problem.)

1. A cloth struts structure which characterized in that includes:

the cloth expanding device comprises a first cloth expanding cylinder and a second cloth expanding cylinder, wherein cloth to be expanded is placed between the first cloth expanding cylinder and the second cloth expanding cylinder, and the first cloth expanding cylinder can move relative to the second cloth expanding cylinder;

one end of the elastic piece is fixed, and the other end of the elastic piece is a free end;

the sensing element comprises a fixing part and a sensing part which are connected, the fixing part is connected with the first cloth opening barrel and moves along with the first cloth opening barrel, the sensing part is connected with the free end, the sensing part stretches the elastic piece when the fixing part moves, and the sensing part obtains the tightness of the cloth opening according to the counterforce applied by the elastic piece.

2. The cloth spreading structure according to claim 1, further comprising a fixed base and a movable plate, wherein the fixed portion is connected to the first cloth spreading cylinder through the movable plate, one end of the elastic member is fixed to the fixed base, and the movable plate is capable of moving relative to the fixed base and driving the first cloth spreading cylinder and the sensing element to move.

3. The cloth spreading structure according to claim 2, wherein the fixed base is provided with a fixed plate having a slide rail, and the movable plate is provided with a sliding groove, and the sliding groove is engaged with and movable along the slide rail.

4. The cloth material stretching structure according to any one of claims 1 to 3, further comprising a control module, wherein the control module is configured to obtain a set value when the cloth material is completely stretched in advance, the sensing element outputs a voltage value according to a reaction force applied by the elastic member, the control module receives the voltage value and compares the voltage value with the set value, and when the voltage value is greater than or equal to the set value, the control module controls the first cloth material stretching tube to stop moving.

5. The cloth stretching structure of claim 4, wherein the control module comprises a processing unit and an input and output unit connected with each other, and the input and output unit is configured to obtain a material and a size of the cloth in advance and output a set value for the processing unit when the cloth is completely stretched.

6. The cloth spreading structure of claim 5, wherein the control module further comprises a display unit, and the display unit is connected to the input and output unit and the sensing element and configured to display the setting value and the voltage value.

7. The cloth stretching structure of claim 6, wherein the cloth stretching structure further comprises a driving unit, and when the voltage value is greater than or equal to the set value, the processing unit sends a signal to the driving unit, and the driving unit controls the first cloth stretching tube to stop moving.

8. A sewing machine comprising a cloth stretching structure according to any one of claims 1 to 7.

9. A method for detecting a pressure of a cloth stretching structure of any one of claims 4 to 7, comprising:

placing the cloth to be expanded between a first cloth expanding cylinder and a second cloth expanding cylinder, and obtaining a set value when the cloth is completely expanded in advance according to the material and the size of the cloth;

moving the first cloth stretching cylinder relative to the second cloth stretching cylinder;

the control module receives the voltage value and compares the voltage value with the set value, and when the voltage value is larger than or equal to the set value, the control module controls the first cloth spreading barrel to stop moving.

10. The pressure detecting method according to claim 9, wherein the sensing element performs sampling at a set time interval when the sensing element outputs a voltage value according to the reaction force applied by the elastic member, and the voltage value is an average value calculated from at least two sampling results.

Technical Field

The invention relates to the technical field of sewing, in particular to a sewing machine, a cloth stretching structure and a pressure detection method thereof.

Background

In the sewing process of the annular lower hem machine, the expansion width with a fixed length is commonly adopted to expand the tightness of the cloth, but the cloth is made to have a small amount of deviation in the actual opening condition due to different materials and sizes of the cloth, so that the final sewing effect is influenced. For example, if the material of the cloth with the same size is different, the tightness of the cloth is expanded by adopting the expansion width with a fixed length, and if the tightness of the material with poor elasticity is proper, the material with good elasticity is too loose. Or, the cloth materials with the same material and different sizes are expanded by adopting the expansion width with fixed length, and if the tightness of the material with smaller size is proper, the material with larger size is too loose.

Traditional accent sign indicating number mode need rely on the degree of strutting of artifical adjustment cloth, and whether the elasticity degree of dependence artifical experience according to the cloth judges to transfer the sign indicating number suitable, and different people have different standards, and the quality that results in transferring to sew up after the sign indicating number has the difference.

Disclosure of Invention

The invention aims to provide a sewing machine, a cloth spreading structure and a pressure detection method thereof, which solve the problem that the traditional manual code adjusting mode is easy to generate errors and improve the sewing quality of cloth.

In order to achieve the above object, as a first aspect of the present invention, there is provided a cloth spreading structure comprising:

the cloth expanding device comprises a first cloth expanding cylinder and a second cloth expanding cylinder, wherein cloth to be expanded is placed between the first cloth expanding cylinder and the second cloth expanding cylinder, and the first cloth expanding cylinder can move relative to the second cloth expanding cylinder;

one end of the elastic piece is fixed, and the other end of the elastic piece is a free end;

the sensing element comprises a fixing part and a sensing part which are connected, the fixing part is connected with the first cloth opening barrel and moves along with the first cloth opening barrel, the sensing part is connected with the free end, the sensing part stretches the elastic piece when the fixing part moves, and the sensing part obtains the tightness of the cloth opening according to the counterforce applied by the elastic piece.

Optionally, the cloth spreading structure further includes a fixed base and a movable plate, the fixed portion is connected to the first cloth spreading cylinder through the movable plate, one end of the elastic member is fixed to the fixed base, and the movable plate can move relative to the fixed base and drive the first cloth spreading cylinder and the sensing element to move.

Optionally, a fixed plate with a slide rail is arranged on the fixed base, a slide groove is arranged on the movable plate, and the slide groove is clamped on the slide rail and can move along the slide rail.

Optionally, the cloth stretching structure further includes a control module, the control module is configured to obtain a set value when the cloth is completely stretched in advance, the sensing element outputs a voltage value according to a reaction force applied by the elastic element, the control module receives the voltage value and compares the voltage value with the set value, and when the voltage value is greater than or equal to the set value, the control module controls the first cloth stretching cylinder to stop moving.

Optionally, the control module includes a processing unit and an input and output unit connected to each other, and the input and output unit is configured to obtain a material and a size of the fabric in advance and output a set value when the fabric is completely stretched to the processing unit.

Optionally, the control module further includes a display unit, and the display unit is connected to the input and output unit and the sensing element, and is configured to display the set value and the voltage value.

Optionally, the cloth stretching structure further includes a driving unit, and when the voltage value is greater than or equal to the set value, the processing unit sends a signal to the driving unit, and the driving unit controls the first cloth stretching cylinder to stop moving.

As a second aspect of the present invention, there is provided a sewing machine including the cloth spreading structure.

As a third aspect of the present invention, there is provided a pressure detection method for a fabric spreading structure, including:

placing the cloth to be expanded between a first cloth expanding cylinder and a second cloth expanding cylinder, and obtaining a set value when the cloth is completely expanded in advance according to the material and the size of the cloth;

moving the first cloth stretching cylinder relative to the second cloth stretching cylinder;

the control module receives the voltage value and compares the voltage value with the set value, and when the voltage value is larger than or equal to the set value, the control module controls the first cloth spreading barrel to stop moving.

Optionally, when the sensing element outputs a voltage value according to the counterforce exerted by the elastic element, the sensing element performs sampling once at intervals of a set time, and the voltage value is an average value calculated according to at least two sampling results.

In the sewing machine, the cloth stretching structure and the pressure detection method thereof, provided by the invention, the moving amount of the first cloth stretching cylinder is in direct proportion to the tensile force applied to the elastic part, and meanwhile, the moving amount of the first cloth stretching cylinder is in direct proportion to the tightness of the cloth, so that the tensile force applied to the elastic part is detected by the sensing element, the tightness of the cloth stretching can be further obtained, the problem that the traditional manual code adjusting mode is easy to generate errors is solved, and the sewing quality of the cloth is improved.

Drawings

It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the invention and do not constitute any limitation to the scope of the invention. Wherein:

fig. 1-2 are schematic views of different viewing angles of a cloth stretching structure according to an embodiment of the present invention;

in the drawings:

10-a first cloth spreading cylinder; 20-an elastic member; 30-an inductive element; 31-a stationary part; 32-a sensing portion; 40-a fixed base; 50-a movable plate; and 60, fixing the plate.

Detailed Description

As described in the background art, in the sewing process of the circular lower hem machine, the tightness of the cloth is generally expanded by adopting the expansion width with a fixed length, but due to the fact that the material and the size of the cloth are different, a small amount of deviation occurs in the actual expanding situation of the cloth, and the final sewing effect is affected. Traditional accent sign indicating number mode need rely on the degree of strutting of artifical adjustment cloth, and whether the elasticity degree of dependence artifical experience according to the cloth judges to transfer the sign indicating number suitable, and different people have different standards, and the quality that results in transferring to sew up after the sign indicating number has the difference.

In order to solve the above problems, a core idea of the present invention is to provide a sewing machine, a cloth stretching structure and a pressure detecting method thereof, the cloth stretching structure including:

the cloth expanding device comprises a first cloth expanding cylinder and a second cloth expanding cylinder, wherein cloth to be expanded is placed between the first cloth expanding cylinder and the second cloth expanding cylinder, and the first cloth expanding cylinder can move relative to the second cloth expanding cylinder;

one end of the elastic piece is fixed, and the other end of the elastic piece is a free end;

the sensing element comprises a fixing part and a sensing part which are connected, the fixing part is connected with the first cloth opening barrel and moves along with the first cloth opening barrel, the sensing part is connected with the free end, the sensing part stretches the elastic piece when the fixing part moves, and the sensing part obtains the tightness of the cloth opening according to the counterforce applied by the elastic piece.

Because the movement amount of the first cloth stretching cylinder is in direct proportion to the tensile force received by the elastic part, and the movement amount of the first cloth stretching cylinder is in direct proportion to the tightness of the cloth, the sensing element is used for detecting the tensile force received by the elastic part so as to obtain the tightness of the cloth stretching, the problem that the traditional manual code adjusting mode is easy to generate errors is solved, and the sewing quality of the cloth is improved.

To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

As used in this application, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this disclosure, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise. As used in this disclosure, the term "plurality" is generally employed in its sense including "at least one" unless the content clearly dictates otherwise. As used in this disclosure, the term "at least two" is generally employed in a sense including "two or more" unless the content clearly dictates otherwise. Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or at least two of the features.

Referring to fig. 1-2, fig. 1-2 are schematic views of a cloth stretching structure provided in an embodiment of the present invention from different viewing angles. This embodiment provides a cloth struts structure, includes:

the cloth expanding device comprises a first cloth expanding cylinder 10 and a second cloth expanding cylinder, wherein cloth to be expanded is placed between the first cloth expanding cylinder 10 and the second cloth expanding cylinder, and the first cloth expanding cylinder 10 can move relative to the second cloth expanding cylinder;

an elastic member 20 having one end fixed and the other end being a free end;

the sensing element 30 comprises a fixing portion 31 and a sensing portion 32 which are connected, the fixing portion 31 is connected with the first cloth spreading barrel 10 and moves along with the first cloth spreading barrel 10, the sensing portion 32 is connected with the free end, the sensing portion 32 stretches the elastic piece 20 when the fixing portion 31 moves, and the sensing portion 32 obtains the spreading tightness of the cloth according to the counterforce applied by the elastic piece 20.

Since the forces are applied mutually, when the sensing part 32 moves and stretches the elastic member 20, the elastic member 20 applies a reaction force to the sensing part 32, that is, the reaction force detected by the sensing element 30 can output a signal (for example, a voltage signal), and then the tightness of the cloth stretching can be obtained according to the signal.

Specifically, the cloth stretching structure is mainly applied to a lower hem machine, the first cloth stretching cylinder 10 and the second cloth stretching cylinder are at the same height and are arranged oppositely, in the sewing process of the lower hem machine, the first cloth stretching cylinder 10 and the second cloth stretching cylinder not only can move relatively, but also can rotate to sew the annular lower hem of the cloth through the first cloth stretching cylinder 10 and the second cloth stretching cylinder.

It should be understood that, in the present application, the first fabric opening cylinder 10 can move relative to the second fabric opening cylinder, and it should be understood that the first fabric opening cylinder 10 moves away from the second fabric opening cylinder, so that the opening of the fabric can be realized.

Referring to fig. 1-2, the fabric spreading structure further includes a fixed base 40 and a movable plate 50, the movable plate 50 is connected to the first fabric spreading cylinder 10, the fixed portion 31 is connected to the first fabric spreading cylinder 10 through the movable plate 50, one end of the elastic member 20 is fixed to the fixed base 40, and the movable plate 50 can move relative to the fixed base 40 and drive the first fabric spreading cylinder 10 and the sensing element 30 to move. That is, the movable plate 50 is connected to the sensing element 30 and the first fabric spreading cylinder 10, respectively, and when the movable plate 50 moves relative to the fixed base 40, the movable plate drives the first fabric spreading cylinder 10 and the sensing element 30 to move, so that the sensing portion 32 stretches the elastic member 20.

Preferably, the fixed base 40 is provided with a fixed plate 60 having a sliding rail, and the movable plate 50 is provided with a sliding slot, which is clamped on the sliding rail and can move along the sliding rail. The slide rail is used for limiting and guiding the movement of the movable plate 50, and in this embodiment, the slide rail is located at the top of the fixing portion 3140. Alternatively, a pulley may be disposed on the movable plate 50, and the pulley may move along the slide rail. Alternatively, a slider may be further disposed on the movable plate 50, and the slider may also move along the slide rail. Of course, the movable plate 50 and the fixed base 40 can also move relatively in other manners, and the application is not limited in this respect.

Referring to fig. 1, the cloth stretching structure further includes a control module, the control module is configured to obtain a set value when the cloth is completely stretched in advance, the sensing element 30 outputs a voltage value according to a reaction force applied by the elastic member 20, the control module receives the voltage value and compares the voltage value with the set value, and when the voltage value is greater than or equal to the set value, the control module controls the first cloth stretching cylinder 10 to stop moving. Specifically, since the size and material of the cloth can be obtained in advance, the relation of the size-material-set value of the cloth can be obtained by performing a simulation distraction experiment on the cloth and stored in the control module, or the control module can call a database storing the relation at any time. Therefore, when a kind of cloth is changed, the control module can quickly obtain a voltage set value corresponding to the cloth, the sensing element 30 outputs a voltage value according to the reaction force applied by the elastic member 20, the control module receives the voltage value and compares the voltage value with the set value, when the voltage value is greater than or equal to the set value, the cloth is completely stretched, namely the tightness of the stretched cloth is proper, the control module controls the first cloth stretching cylinder 10 to stop moving, and then the cloth is sewn.

In this embodiment, the control module is, for example, a PLC (programmable logic controller). The sensing element 30 is a pressure sensor, such as a piezoresistive sensor, and has low cost and high detection accuracy. The application does not limit this at all

It should be understood that even if the same cloth is in the same size, there is a small amount of size error, so that when the simulated stretching experiment is performed on various cloths, the set value of the voltage can be compensated through a compensation algorithm, so that the obtained set value is more reasonable, and the sewing quality of the cloths is improved.

Further, the control module comprises a processing unit and an input and output unit which are connected, wherein the input and output unit is used for acquiring the material and the size of the cloth in advance and outputting a set value when the cloth is completely stretched to the processing unit.

Further, the control module further includes a display unit, and the display unit is connected to the input and output unit and the sensing element 30, and is configured to display the setting value and the voltage value.

The input and output unit is, for example, an operation panel for inputting the material and size of the cloth to be sewn and outputting a set value when the cloth is completely spread, and the display unit is, for example, a display screen for displaying the set value and the voltage value. Or the input unit and the display unit are integrated into a human-computer interaction interface, and the set value when the cloth is stretched and the voltage value of the sensing element 30 are obtained by performing operations such as text input, language input, clicking and the like on the human-computer interaction interface, so that the sewing personnel can know and control the movement of the first cloth stretching cylinder 10 in real time.

In this embodiment, the cloth stretching structure further includes a driving unit, and when the voltage value is greater than or equal to the set value, the control module sends a signal to the driving unit, and the driving unit controls the first cloth stretching tube 10 to stop moving. The driving unit is used for controlling the movement of the first cloth spreading cylinder 10, and the driving unit is, for example, a motor, which is not limited in this application.

In this embodiment, the elastic member 20 includes a spring, and the sensing portion 32 of the pressure sensor is U-shaped and is clamped at a free end of the spring. The spring has a simple structure, is easy to manufacture and low in price, and is a better choice.

Based on the same inventive concept, the invention provides a sewing machine, which comprises the cloth spreading structure, and certainly, the sewing machine also comprises a machine body, a machine table and other conventional parts, which are not described again in the application.

As another aspect of the present invention, the present invention further provides a pressure detection method of the cloth stretching structure, including the following steps:

s1, placing the cloth to be expanded between a first cloth expanding cylinder and a second cloth expanding cylinder, and obtaining a set value of the fully expanded cloth in advance according to the material and the size of the cloth;

s2, enabling the first cloth stretching cylinder to move relative to the second cloth stretching cylinder;

s3, outputting a voltage value according to the counterforce exerted by the elastic piece through the sensing element, receiving the voltage value by the control module, comparing the voltage value with the set value, and controlling the first cloth opening cylinder to stop moving when the voltage value is larger than or equal to the set value.

Specifically, step S1 is executed first, a cloth to be expanded is placed between a first cloth expanding cylinder and a second cloth expanding cylinder, a set value when the cloth is completely expanded is obtained in advance according to the material and size of the cloth, and since the size and material of the cloth can be obtained in advance, the size-material-set value relationship of the cloth can be obtained by performing a simulated expanding experiment on the cloth, and when a cloth is changed, a voltage set value corresponding to the cloth can be obtained quickly by a control module.

Next, step S2 is executed to move the first cloth spreading cylinder relative to the second cloth spreading cylinder. In this embodiment, the first cloth stretching cylinder is driven by a driving unit (e.g., a motor) to move so as to stretch the cloth.

And finally, executing step S3, outputting a voltage value according to the counterforce exerted by the elastic element through the sensing element, receiving the voltage value by the control module, comparing the voltage value with the set value, and controlling the first cloth opening cylinder to stop moving when the voltage value is greater than or equal to the set value. When the voltage value is greater than or equal to the set value, the cloth is completely stretched at the moment, namely the stretching tightness of the cloth is proper, the control module sends a signal to the driving unit, the driving unit controls the first cloth stretching barrel to stop moving, and then the cloth is sewn.

Furthermore, when the tensile force applied to the elastic piece is detected through the sensing element and a voltage value is output, the sensing element performs sampling once at intervals of set time, and the voltage value is an average value calculated according to at least two sampling results. The voltage value is sampled for a plurality of times within a certain time, so that the precision and the accuracy of the voltage value are improved. In this embodiment, the setting time is 100 microseconds, and the voltage value is an average value calculated according to 10 sampling results.

To sum up, the embodiment of the invention provides a sewing machine, a cloth stretching structure and a pressure detection method thereof, wherein the cloth stretching structure comprises: the cloth expanding device comprises a first cloth expanding cylinder and a second cloth expanding cylinder, wherein cloth to be expanded is placed between the first cloth expanding cylinder and the second cloth expanding cylinder, and the first cloth expanding cylinder can move relative to the second cloth expanding cylinder; one end of the elastic piece is fixed, and the other end of the elastic piece is a free end; the sensing element comprises a fixing part and a sensing part which are connected, the fixing part is connected with the first cloth opening barrel and moves along with the first cloth opening barrel, the sensing part is connected with the free end, the sensing part stretches the elastic piece when the fixing part moves, and the sensing part obtains the tightness of the cloth opening according to the counterforce applied by the elastic piece. Because the movement amount of the first cloth stretching cylinder is in direct proportion to the tensile force received by the elastic part, and the movement amount of the first cloth stretching cylinder is in direct proportion to the tightness of the cloth, the sensing element is used for detecting the tensile force received by the elastic part so as to obtain the tightness of the cloth stretching, the problem that the traditional manual code adjusting mode is easy to generate errors is solved, and the sewing quality of the cloth is improved.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.