Tape unwinding tension control device

Abstract

The utility model discloses a cloth tape unwinding tension control device, including mounting seat, gyro wheel group, motor and tension control mechanism, and tension control mechanism includes swing rod, counterweight, movable baulk, tension limit switch and encoder, and one end of swing rod is swingably installed on mounting seat, and the other end is installed movable baulk, and still be installed with one counterweight on swing rod, tension limit switch is installed in the side of swing rod, is used for swing rod's initial position limit, still be equipped with an encoder for recording swing rod swing angle on mounting seat, and tension limit switch and encoder are electrically connected with motor respectively. The utility model discloses a cloth tape unwinding tension control device for other model cloth tape production, because of having the initial limit of tension limit switch, only needs to adjust the parameter of encoder, and the data of encoder can be read, so adjustment is simple and convenient.

Description

Technical Field

[0001] This utility model relates to the field of zipper manufacturing equipment, and more specifically to a tape unwinding tension control device. Background Technology

[0002] Zippers are connectors that use continuously arranged teeth to join or separate items, and are widely used in clothing, packaging, tents, and other applications. The zipper assembly on a nylon zipper is made by sewing teeth and fabric tape together using a sewing machine. During zipper production, acceleration, deceleration, or emergency stops of the fabric tape can cause sudden changes in inertial tension. If the unwinding tension is out of control, the nylon yarn may be stretched and deformed, resulting in uneven tooth spacing or reduced closing force. Insufficient tension will cause the material to loosen and drift, leading to wrinkles or lateral shift, affecting the accuracy of subsequent processing.

[0003] To address the above issues, the applicant disclosed a constant tension length measuring device for a nylon zipper sewing machine in Chinese invention patent application publication number CN 111620196A. The device includes a slider assembly, a drive wheel, a drive wheel motor, a belt pressing mechanism, and a length measuring mechanism. The belt pressing mechanism is located above the drive wheel. The slider assembly includes a guide rod, a slider, a pulley, an upper sensor switch, and a lower sensor switch. The guide rod is vertically fixed below the drive wheel, and the pulley is fixed to the slider. The slider is slidably mounted on the guide rod. The upper and lower sensor switches are located at the top and bottom of the slider's sliding path, respectively. The upper and lower sensor switches are respectively connected to the drive wheel motor for control. The length measuring mechanism includes a meter-counting wheel and a meter counter control box. The meter-counting wheel rotates synchronously with the drive wheel.

[0004] While the above patents effectively buffer the nylon zipper blanks by maintaining a constant overall weight of the slider assembly, with the slider's rise and fall triggering the motor's start and stop to intermittently pull the nylon zipper blanks, this device becomes problematic when used for producing other types of nylon zipper blanks. Changes in tension cause corresponding changes in the buffering distance, necessitating manual adjustment of the upper and lower sensor switches. This adjustment is cumbersome, requiring disassembly and reassembly of the switches, and lacks readily available data, relying heavily on the experience of technicians. Therefore, we provide a fabric tension control device. Utility Model Content

[0005] This invention provides a tape unwinding tension control device to solve the shortcomings of existing tape tension control devices, such as cumbersome adjustment and lack of data when used in the production of other types of nylon zipper blanks, which rely more on the experience of technicians for adjustment.

[0006] The present invention adopts the following technical solution: A fabric tape unwinding tension control device includes a mounting base, a roller assembly mounted on the mounting base for unwinding the fabric tape, and a motor for driving the roller assembly to rotate. It also includes a tension control mechanism, which comprises a swing arm, a counterweight, a movable stop wheel, a tension limit switch, and an encoder. One end of the swing arm is oscillatingly mounted on the mounting base, and the other end is fitted with the movable stop wheel. The counterweight is also mounted on the swing arm. The tension limit switch is mounted beside the swing arm for limiting its initial position. An encoder for recording the swing angle of the swing arm is also provided on the mounting base. The tension limit switch and the encoder are electrically connected to the motor.

[0007] In a preferred embodiment, the roller assembly consists of a drive wheel and a pressure wheel, and the motor is connected to the drive wheel.

[0008] In a preferred embodiment, several cloth guide wheels are provided in front of the roller assembly.

[0009] In a preferred embodiment, a fabric belt knot detection mechanism is also provided between the aforementioned fabric belt guide wheels.

[0010] In a preferred embodiment, the above-mentioned fabric tape knot detection mechanism includes a knot detection rod, a swing block, a swing block elastic support assembly, an auxiliary rod, and a knot detection switch. One end of the swing block is rotatably mounted on the mounting base, and the other end is a swing end and is fixedly provided with the knot detection rod. The auxiliary rod is spaced apart on the side of the knot detection rod. The swing block elastic support assembly and the knot detection switch are respectively provided on both sides of the swing end of the swing block.

[0011] In a preferred embodiment, one end of the aforementioned lever is connected to a fixed shaft, the fixed shaft being rotatably mounted on the mounting base, and the encoder being connected to the fixed shaft.

[0012] In a preferred embodiment, a pressure rod is further provided between the roller assembly and the movable stop wheel.

[0013] The fabric tape unwinding tension control device of this utility model also includes a height-adjusting wheel shaft, which is located above the movable stop wheel.

[0014] As can be seen from the above description of the structure of this utility model, compared with the prior art, this utility model has the following advantages: 1. The tension control mechanism of this utility model includes a swing arm, a counterweight, a movable stop wheel, a tension limit switch, and an encoder. The tension limit switch is used to limit the initial position of the swing arm, while the encoder records the swing angle of the swing arm. When used in the production of other types of fabric tape, since the initial limit is provided by the tension limit switch, only the parameters of the encoder need to be adjusted. Since the encoder data is readable, the adjustment is simple and convenient.

[0015] 2. This utility model features a fabric tape knot detection mechanism in front of the roller assembly. The alarm principle of this mechanism is as follows: when the fabric tape knots, the knot detection rod pulls the swing block towards the side of the swing block's elastic support assembly. The knot detection switch cannot detect the signal from the knot detection rod, thus triggering an alarm. This fabric tape knot detection mechanism can prevent the fabric tape from knotting or tangling before the chain teeth are sewn, reducing waste and ensuring product quality. Attached Figure Description

[0016] Figure 1 This is a diagram showing the winding path of the fabric tape installed on the frame according to this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0018] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 . Detailed Implementation

[0019] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Many details are described below to provide a comprehensive understanding of this utility model; however, those skilled in the art can implement this utility model without these details. Well-known components, methods, and processes will not be described in detail below.

[0020] This embodiment provides a tape unwinding tension control device, referring to... Figure 1 and Figure 2 It includes a mounting base 2, a roller assembly 30, a motor 31, and a tension control mechanism. The front end of the frame 1 of the sewing equipment is equipped with a guide wheel 11 and a fabric guide wheel 12.

[0021] Reference Figure 1 and Figure 2 The mounting base 2 is fixed to the frame 1, and the roller assembly 3 is mounted on the mounting base 2 for unwinding the fabric belt; the roller assembly 3 consists of a drive wheel 301 and a pressure wheel 302. A motor 31 is used to drive the roller assembly 3 to rotate and is connected to the drive wheel 301. Although this embodiment... Figure 1 The diagram shows the drive wheel 301 at the bottom and the pressure wheel 302 at the top. However, in practical applications, the drive wheel can also be positioned at the top and the pressure wheel at the bottom.

[0022] Reference Figure 2 and Figure 3 The aforementioned tension control mechanism includes a swing arm 41, a counterweight 42, a movable stop wheel 43, a tension limit switch 44, and an encoder 45. One end of the swing arm 41 is swayably mounted on the mounting base 2, and the other end is equipped with the movable stop wheel 43. Specifically, one end of the swing arm 41 is fixedly connected to a fixed shaft 411, and the fixed shaft 411 is rotatably mounted on the mounting base 2.

[0023] Reference Figure 2 and Figure 3 A counterweight 42 is also installed on the swing arm 41, and a tension limit switch 44 is installed on the side of the swing arm 41 for limiting the initial position of the swing arm. An encoder 45 for recording the swing angle of the swing arm 41 is also provided on the mounting base 2. Specifically, the encoder 45 is connected to the aforementioned fixed shaft 411. The tension limit switch 44 and the encoder 45 are electrically connected to the motor 31.

[0024] Reference Figure 1 and Figure 2 A fabric belt knot detection mechanism is also provided between the first guide wheel 11 and the second guide wheel 12, and a third guide wheel 13 is provided between the second guide wheel 12 and the roller group 3. The fabric belt knot detection mechanism includes a knot detection rod 51, a swing block 52, a swing block elastic support assembly 53, an auxiliary rod 54, and a knot detection switch 55. One end of the swing block 52 is rotatably mounted on the mounting base 2, and the other end is a swing end and is fixedly provided with the knot detection rod 51. The mounting base 2 on the side of the knot detection rod 51 is provided with auxiliary rods 54 at intervals, and the distance between the auxiliary rods 54 and the knot detection rod 51 is slightly greater than the thickness of the fabric belt. The swing block elastic support assembly 53 and the knot detection switch 55 are respectively provided on both sides of the swing end of the swing block 52. The swing block elastic support assembly 53 includes a bolt 531, a spring 532, and a bolt mounting block 533. The bolt mounting block 533 is fixed to the side of the swing block 52. A threaded hole is opened on the bolt mounting block 533, and the end of the bolt 531 passes through the threaded hole, with a gap between it and the swing block 52. The spring 532 is installed between the end of the bolt 531 and the side of the swing block 52. When the fabric is unwound normally, the spring 532 presses tightly against the side of the swing block to fix it. When the fabric gets knotted, the knot detection rod 51 drives the swing block to compress the spring towards the side of the swing block elastic support assembly 53.

[0025] Reference Figure 1 A pressure bar 46 is also provided between the roller group 3 and the movable stop roller 43. A height-adjusting roller shaft 14 is provided at the rear end of the frame 1. The height-adjusting roller shaft 14 is located above the movable stop roller 43 to guide the fabric strip to the sewing process.

[0026] The method of using the above-mentioned fabric tape unwinding tension control device includes the following steps: 1. The fabric tape is sequentially passed around the first fabric tape guide wheel, the knot detection rod, the second fabric tape guide wheel, the third fabric tape guide wheel, the roller group, the pressure bar, the movable stop wheel, and the rotating wheel shaft on the frame, and finally reaches the working position of the sewing equipment.

[0027] 2. During normal operation, the movable stop wheel swings up and down with the swing arm. When the motor accelerates, the movable stop arm falls downwards. When the swing arm reaches its initial position, a deceleration signal is triggered by the tension limit switch, causing the motor to decelerate and the movable stop wheel to rise with the swing arm. The encoder records the rotation angle of the swing arm. When the swing arm reaches the maximum deflection angle set by the encoder, the motor is triggered to accelerate, and the movable stop wheel falls downwards. This cycle continues until the tension becomes constant and remains stable.

[0028] 3. When a knot occurs in the fabric belt, the belt pulls the swing block towards the side of the elastic support assembly. The knot detection switch cannot detect the knot detection rod signal and triggers an alarm. After the knot is cleared, the fabric belt is re-looped around the first fabric belt guide wheel, knot detection rod, second fabric belt guide wheel, third fabric belt guide wheel, roller group, pressure rod, movable stop wheel, and height adjustment wheel axle on the frame, and the equipment continues to operate.

[0029] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A fabric tape unwinding tension control device, comprising a mounting base, a roller assembly mounted on the mounting base for unwinding the fabric tape, and a motor for driving the roller assembly to rotate, characterized in that: It also includes a tension control mechanism, which comprises a swing arm, a counterweight, a movable stop wheel, a tension limit switch, and an encoder. One end of the swing arm is swayably mounted on the mounting base, and the other end is equipped with the movable stop wheel. The counterweight is also mounted on the swing arm. The tension limit switch is mounted on the side of the swing arm and is used to limit the initial position of the swing arm. The mounting base is also equipped with an encoder for recording the swing angle of the swing arm. The tension limit switch and the encoder are electrically connected to the motor.

2. The fabric tape unwinding tension control device as described in claim 1, characterized in that: The roller assembly consists of a drive wheel and a pressure wheel, and the motor is connected to the drive wheel.

3. The fabric tape unwinding tension control device as described in claim 1, characterized in that: Several cloth belt guide wheels are also provided in front of the roller assembly.

4. The fabric tape unwinding tension control device as described in claim 3, characterized in that: A fabric belt knot detection mechanism is also provided between the fabric belt guide wheels.

5. The fabric tape unwinding tension control device as described in claim 4, characterized in that: The fabric tape knot detection mechanism includes a knot detection rod, a swing block, a swing block elastic support assembly, an auxiliary rod, and a knot detection switch. One end of the swing block is rotatably mounted on the mounting base, and the other end is a swing end and is fixedly provided with the knot detection rod. The auxiliary rod is spaced apart from the side of the knot detection rod. The swing block elastic support assembly and the knot detection switch are respectively provided on both sides of the swing end of the swing block.

6. The fabric tape unwinding tension control device as described in claim 1, characterized in that: One end of the swing arm is connected to a fixed shaft, which is rotatably mounted on the mounting base, and the encoder is connected to the fixed shaft.

7. The fabric tape unwinding tension control device as described in claim 1, characterized in that: A pressure rod is also provided between the roller assembly and the movable stop wheel.

8. The fabric tape unwinding tension control device as described in claim 1, characterized in that: It also includes a height-adjusting axle, which is located above the movable stop wheel.

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