Cloth spreading machine

Abstract

The invention provides a spreading machine which comprises a multi-groove round pipe, a sliding way is arranged on the multi-groove round pipe, two nail plates are arranged on the two sides of the sliding way in a sliding mode, an elastic rubber strip is connected between the two nail plates, guide wheels are arranged at the lower ends of the nail plates, a cloth sensing system is arranged on one side of a feeding port of the multi-groove round pipe, and a first guide cylinder and a second guide cylinder are arranged on the inner side of the multi-groove round pipe. A first driving assembly for adjusting the position of the first guide cylinder in real time is arranged on the first guide cylinder, and a second driving assembly for adjusting the positions of the two second guide cylinders according to the required fabric expanding width is arranged on the second guide cylinders. According to the spreading machine provided by the invention, the position of the first guide cylinder is adjusted in real time according to the sensing system, and the position of the nail plate is adjusted by guiding the guide wheel of the nail plate through the first guide cylinder, so that the nail plate can fix the boundary of cloth at the feed port of the spreading machine, and the guide wheel of the nail plate is pushed to the second guide cylinder in the rotating process of the multi-groove circular tube; the guide wheel on the nail plate is guided through the second guide cylinder, and the cloth is expanded to the specified width.

Description

Technical Field

[0001] The present invention relates to the technical field of cloth stretching machines, in particular to a cloth stretching machine. Background Art

[0002] A stenter frame is a device used in textile printing and dyeing factories that stretches the fabric flat and makes its weft width uniform by heating and applying tension to both sides.

[0003] In the prior art, tentering machines are generally large machines that occupy a large area and have high requirements for factory buildings. When adjusting the tentering width of the fabric, it is necessary to adjust the distance between the needle plates on both sides, which consumes high energy, makes high noise, and is inconvenient to adjust. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the prior art that the tentering machine is generally a large machine, and when adjusting the cloth tentering width, it is necessary to adjust the distance between the needle plates on both sides, which results in high energy consumption, high noise and inconvenient adjustment, the present invention provides a cloth stretching machine.

[0005] The technical solution to be adopted by the present invention to solve its technical problems is: a cloth stretching machine, comprising a multi-grooved circular tube, the cross-section of the multi-grooved circular tube is circular, the multi-grooved circular tube is provided with a driving device for driving the multi-grooved circular tube to rotate along the axis, the multi-grooved circular tube comprises a plurality of conveying strips arranged at intervals along the conveying direction, the conveying strip is provided with a slideway arranged along the length direction, two nail plates for fixing the two sides of the cloth are slidably arranged on both sides of the slideway, an elastic rubber strip is connected between the two nail plates in the same slideway, a guide wheel is provided at the lower end of the nail plate, a sensing system for sensing the boundary position of the cloth is provided on one side of the feeding port of the multi-grooved circular tube, two first guide cylinders and two second guide cylinders are provided on the inner side of the multi-grooved circular tube, a first guide surface cooperating with the guide wheel is provided on the side of the two first guide cylinders away from each other, a first driving component for adjusting the position of the first guide cylinder in real time according to the boundary position of the cloth is provided on both the first guide cylinders, a second guide surface cooperating with the guide wheel is provided on the side of the two second guide cylinders away from each other, the second guide surface is an elliptical inclined surface, and a second driving component for adjusting the position of the two second guide cylinders according to the required expansion width of the cloth is provided on both the second guide cylinders.

[0006] The rotation speed of the multi-slot circular tube matches the feeding speed of the cloth, and the multi-slot circular tube drives the nail plate in the slide to circulate and roll during its rotation; the cloth pulling machine adjusts the position of the nail plate by adjusting the position of the guide wheel, and the nail plate is used to fix the boundary position of the cloth; the two nail plates in the same slide are connected by an elastic rubber strip, and the contraction force of the elastic rubber strip presses the guide wheels of the two nail plates on the elastic rubber strip tightly against the first guide surface or the second guide surface; the sensing system is used to sense the boundary position of the cloth in real time, and the first driving component is used to synchronously adjust the position of the first guide cylinder according to the cloth boundary sensed by the sensing system, and the first guide cylinder is used to capture the guide wheel of the nail plate at the feeding position, and the multi-slot circular tube drives the guide wheel to move on the first guide surface of the first guide cylinder during its rotation, and when approaching the second guide cylinder, the guide wheel slides to the second guide surface of the second guide cylinder, and guides the guide wheel through the second guide surface (elliptical inclined surface) to expand the cloth.

[0007] Before the fabric is expanded, the positions of the two second guide cylinders are adjusted respectively by the two second drive components according to the predetermined expansion width of the fabric; the distance between the two points of the two elliptical slopes at the outlet, plus the horizontal distance between the two guide wheels and the nails, is equal to the expansion width of the fabric. It should be noted that the boundary range of the fabric should be between the highest point and the lowest point of the elliptical slope. If the fabric boundary is inside the lowest point of the elliptical slope, the nail plate cannot be fixed to the fabric boundary. If the fabric boundary is outside the highest point of the elliptical slope, the first guide cylinder cannot transition the guide wheel to the second guide cylinder, and the expansion function is lost.

[0008] Furthermore, the nail plate includes a main board, the guide wheel and a plurality of pulleys cooperating with the slide are provided below the main board, a connecting plate is provided above the main board, a connecting groove cooperating with the elastic rubber strip is provided on the connecting plate, a plurality of threaded holes are provided in the connecting groove, fixing bolts are passed through the threaded holes, a nail seat is provided at the upper end of the connecting plate, and a plurality of adjustment holes cooperating with the nail seat are provided at intervals along the length direction of the main board on the upper end of the connecting plate.

[0009] The elastic rubber strip is partially inserted into the connecting groove of the connecting plate and fixed by fixing bolts. The deformation force of the elastic rubber strip is mainly concentrated on the connecting groove and the fixing bolts, thereby reducing the damage of the elastic rubber strip by the nails and extending the service life of the elastic rubber strip. When the elastic rubber strip is damaged at the nail, the service life of the elastic rubber strip can be extended by adjusting the position of the nail seat.

[0010] Furthermore, in order to adjust the position of the first guide cylinder, the first drive assembly includes a first motor, a first lead screw, a guide rail and an intermediate block, the first motor is arranged on one side of the multi-groove round tube and fixedly connected to the frame, the intermediate block is arranged at the middle position of the inner side of the multi-groove round tube, the first guide cylinder is provided with a first transmission plate, one end of the first lead screw is connected to the output end of the first motor, and the other end is rotatably connected to the intermediate block, the first lead screw passes through the first transmission plate and is threadedly connected to the first transmission plate, one end of the guide rail is connected to the intermediate block, and the other end is connected to the frame, and the first transmission plate is slidably connected to the guide rail. One first drive assembly can only adjust the position of one first guide cylinder, and the actions of the two first drive assemblies are independent of each other, that is, the movements of the two first guide cylinders are independent.

[0011] Furthermore, in order to adjust the position of the second guide cylinder, the second drive assembly includes a second motor and a second lead screw, the second motor is arranged at the end of the multi-groove round tube and fixedly connected to the frame, the second guide cylinder is sleeved outside the first guide cylinder, a second transmission plate is arranged on the second guide cylinder, one end of the second lead screw is connected to the output end of the second motor, and the other end is rotatably connected to the intermediate block, the second lead screw passes through the second transmission plate and is threadedly connected to the second transmission plate, and the second transmission plate is slidably connected to the guide rail. One second drive assembly can only adjust the position of one second guide cylinder, and the actions of the two second drive assemblies are independent of each other, that is, the movements of the two second guide cylinders are independent.

[0012] Furthermore, a retaining frame is provided on one side of the second transmission plate, and the retaining frame includes a first bearing, the inner ring of the first bearing is fixedly connected to the second transmission plate, the outer ring of the first bearing is supported on the inner side of the multi-groove circular tube, a plurality of second bearings are provided on the outer ring of the first bearing along the circumferential direction, and a plurality of sliding grooves cooperating with the second bearings are provided on the inner wall surface of the multi-groove circular tube.

[0013] Since the second guide surface is an inclined surface, when the guide wheel squeezes the second guide surface, the second guide cylinder will tend to tilt to one side. In order to extend the service life of related parts and ensure the quality of cloth expansion, a retainer is set on the second transmission plate side of the second guide cylinder to increase the structural stability. When adjusting the position of the second guide cylinder, the retainer moves synchronously with the second guide cylinder through the cooperation of the second bearing and the slide groove. During the working process, the inner ring of the first bearing does not move, and the outer ring cooperates with the slide groove of the multi-groove round tube through the second bearing and the multi-groove round tube, and rotates synchronously with the multi-groove round tube.

[0014] Furthermore, a first avoidance hole corresponding to the position of the second screw is provided on the first transmission plate, and a second avoidance hole corresponding to the position of the first screw is provided on the second transmission plate.

[0015] Furthermore, the sensing system includes a detection plate and a base, the detection plate is provided with a U-shaped detection portion, the U-shaped detection portion is provided with two infrared sensors, the base is provided with a servo motor and a lead screw for driving the detection plate to move along the width direction of the multi-slot circular tube, and the servo motor and the first motor are both connected to the controller signal.

[0016] Two infrared sensors are set in the U-shaped detection part. According to whether the two infrared sensors sense the cloth, the controller controls the servo motor to rotate forward or reverse, thereby driving the detection plate to move toward the boundary direction of the multi-slot circular tube or the middle position direction of the multi-slot circular tube. When both infrared sensors detect the cloth, the servo motor drives the detection plate to move toward the boundary direction of the multi-slot circular tube; when both infrared sensors do not detect the cloth, the servo motor drives the detection plate to move toward the middle position direction of the multi-slot circular tube; when the inner infrared sensor detects the cloth and the outer infrared sensor does not detect the cloth, the detection plate stops moving. The controller controls the first motor to rotate according to the position of the detection plate, thereby controlling the movement of the first guide cylinder to ensure that the nail plate at the feed inlet can capture the cloth boundary.

[0017] Furthermore, the base is provided with a cloth guiding rod for guiding the cloth into the U-shaped detection part.

[0018] Furthermore, in order to drive the multi-grooved circular tube to rotate, the two ends of the multi-grooved circular tube are rotatably connected to the frame through bearings, and the driving device includes driving teeth and a driving motor. The driving teeth are sleeved on one side of the multi-grooved circular tube, and the driving teeth are drivingly connected to the output end of the driving motor.

[0019] The beneficial effects of the present invention are as follows: a cloth stretching machine provided by the present invention adjusts the position of the first guide cylinder in real time according to the sensing system, and guides the guide wheel of the nail plate to adjust the position of the nail plate through the first guide cylinder, so that the nail plate can fix the cloth boundary at the feeding port of the cloth stretching machine, and the nail plate guide wheel is pushed onto the second guide cylinder during the rotation of the multi-slot circular tube, and the guide wheel on the nail plate is guided by the second guide cylinder to expand the cloth to a specified width, with low energy consumption, low noise, smooth movement and high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a schematic diagram of the structure of the best embodiment of the present invention; Figure 2 yes Figure 1 A is an enlarged schematic diagram; Figure 3 yes Figure 1 A magnified schematic diagram of B; Figure 4 It is a schematic diagram of the internal structure of the cloth spreading machine; Figure 5 yes Figure 4 A magnified schematic diagram of middle C; Figure 6 is a schematic diagram of the structure of the first drive assembly and the second drive assembly; Figure 7 It is a schematic diagram of the structure of the nail board; Figure 8 yes Figure 7 A magnified schematic diagram of D in the middle.

[0022] In the figure: 1, frame, 2, multi-slot round tube, 201, slide, 3, nail plate, 301, guide wheel, 302, main board, 303, pulley, 304, connecting plate, 305, connecting groove, 306, threaded hole, 307, nail seat, 308, adjustment hole, 4, elastic rubber strip, 5, first guide cylinder, 501, first transmission plate, 502, first guide surface, 6, second guide cylinder, 601, second transmission plate, 602, second guide surface, 7, first motor, 8, first lead screw, 9, guide rail, 10, intermediate block, 11, second motor, 12, second lead screw, 13, detection plate, 14, base, 15, cloth guide rod, 16, driving tooth, 17, driving motor, 18, limit switch, 19, retaining frame, 1901, first bearing, 1902, second bearing. DETAILED DESCRIPTION

[0023] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0024] like Figure 1-8 As shown, a cloth pulling machine of the present invention comprises a multi-grooved circular tube 2, the cross-section of the multi-grooved circular tube 2 is circular, both ends of the multi-grooved circular tube 2 are rotatably connected to the frame 1 through bearings, the multi-grooved circular tube 2 is provided with a driving device for driving the multi-grooved circular tube 2 to rotate along the axis, the driving device comprises a driving tooth 16 and a driving motor 17, the driving tooth 16 is sleeved on one side of the multi-grooved circular tube 2, the driving tooth 16 is transmission-connected to the output end of the driving motor 17, and the driving motor 17 controls the rotation speed of the multi-grooved circular tube 2 to match the feeding speed of the cloth.

[0025] The multi-slot circular tube 2 includes a plurality of conveying strips spaced apart along the conveying direction, a slideway 201 disposed along the length direction is disposed on the conveying strip, two nail plates 3 for fixing the two sides of the cloth are slidably disposed on both sides of the slideway 201, an elastic rubber strip 4 is connected between the two nail plates 3 in the same slideway 201, the nail plate 3 includes a main board 302, a guide wheel 301 and a plurality of pulleys 303 cooperating with the slideway 201 are disposed below the main board 302, a connecting plate 304 is disposed above the main board 302, a connecting groove 305 cooperating with the elastic rubber strip 4 is disposed on the connecting plate 304, a plurality of threaded holes 306 are disposed in the connecting groove 305, fixing bolts are passed through the threaded holes 306, a nail seat 307 is disposed at the upper end of the connecting plate 304, and a plurality of adjustment holes 308 cooperating with the nail seat 307 are disposed at the upper end of the connecting plate 304 along the length direction of the main board 302.

[0026] A sensing system for sensing the boundary position of the cloth is provided on one side of the feeding port of the multi-grooved circular tube 2. The sensing system includes a detection plate 13 and a base 14. The detection plate 13 is provided with a U-shaped detection part, and two infrared sensors are provided in the U-shaped detection part. The base 14 is provided with a servo motor and a lead screw for driving the detection plate 13 to move along the width direction of the multi-grooved circular tube 2. The base 14 is provided with a limit switch 18 for controlling the sliding range of the detection plate 13. The servo motor and the first motor 7 are both connected to the controller signal. The base 14 is provided with a cloth guide rod 15 for guiding the cloth into the U-shaped detection part. When both infrared sensors detect the cloth, the servo motor drives the detection plate 13 to move toward the boundary direction of the multi-grooved circular tube 2; when both infrared sensors do not detect the cloth, the servo motor drives the detection plate 13 to move toward the middle position of the multi-grooved circular tube 2; when the inner infrared sensor detects the cloth and the outer infrared sensor does not detect the cloth, the detection plate 13 stops moving.

[0027] Two first guide cylinders 5 and two second guide cylinders 6 are provided on the inner side of the multi-grooved circular tube 2. A first guide surface 502 cooperating with the guide wheel 301 is provided on the side of the two first guide cylinders 5 away from each other. A first driving component for adjusting the position of the first guide cylinder 5 in real time according to the boundary position of the cloth is provided on the two first guide cylinders 5. A second guide surface 602 cooperating with the guide wheel 301 is provided on the side of the two second guide cylinders 6 away from each other. The second guide surface 602 is an elliptical inclined surface. A second driving component for adjusting the position of the two second guide cylinders 6 according to the required expansion width of the cloth is provided on the two second guide cylinders 6.

[0028] The first driving assembly includes a first motor 7, a first lead screw 8, a guide rail 9 and an intermediate block 10, and the second driving assembly includes a second motor 11 and a second lead screw 12. The first motor 7 is arranged on one side of the multi-slot circular tube 2 and is fixedly connected to the frame 1. The intermediate block 10 is arranged at the middle position of the inner side of the multi-slot circular tube 2. A first transmission plate 501 is provided on the first guide cylinder 5. One end of the first lead screw 8 is connected to the output end of the first motor 7, and the other end is rotatably connected to the intermediate block 10. The first lead screw 8 passes through the first transmission plate 501 and is threadedly connected to the first transmission plate 501. One end of the guide rail 9 is connected to the center position of the intermediate block 10, and the other end is connected to the frame 1. The first transmission plate 501 is slidably connected to the guide rail 9, and the first transmission plate 501 is provided with a first avoidance hole corresponding to the position of the second lead screw 12.

[0029] The second motor 11 is arranged at the end of the multi-grooved circular tube 2 and is fixedly connected to the frame 1. The second guide cylinder 6 is sleeved on the outside of the first guide cylinder 5. The second guide cylinder 6 is provided with a second transmission plate 601. One end of the second lead screw 12 is connected to the output end of the second motor 11, and the other end is rotatably connected to the intermediate block 10. The second lead screw 12 passes through the second transmission plate 601 and is threadedly connected to the second transmission plate 601. The second transmission plate 601 is slidably connected to the guide rail 9. The first lead screw 8 and the second lead screw 12 are symmetrically arranged on both sides of the guide rail 9. The second transmission plate 601 is provided with a second avoidance hole corresponding to the position of the first lead screw 8.

[0030] A retaining frame 19 is provided on one side of the second transmission plate 601, and the retaining frame 19 includes a first bearing 1901. The inner ring of the first bearing 1901 is fixedly connected to the second transmission plate 601, and the outer ring of the first bearing 1901 is supported on the inner side of the multi-groove circular tube 2. A plurality of second bearings 1902 are circumferentially provided on the outer ring of the first bearing 1901, and a plurality of sliding grooves cooperating with the second bearing 1902 are provided on the inner wall surface of the multi-groove circular tube 2.

[0031] Working process: Before starting work, the positions of the two second guide cylinders 6 are adjusted by the two second motors 11 according to the cloth specifications, so that the distance between the two points of the two elliptical slopes at the discharge port plus the horizontal distance between the two guide wheels 301 and the nails is equal to the expanded width of the cloth.

[0032] When the machine is started, the driving motor 17 drives the multi-slot circular tube 2 to rotate, so that the rotation speed of the multi-slot circular tube 2 matches the feeding speed of the cloth, and the cloth guide rod 15 guides the cloth into the moving range of the two detection plates 13. The two infrared sensors in the U-shaped detection part cooperate with each other to detect the real-time position of the cloth boundary and send a signal to the controller, which sends a signal to the first motor 7 through the controller to drive the first motor 7 to rotate forward or reverse, thereby adjusting the position of the first guide cylinder 5, and then adjusting the position of the nail plate 3 at the feed port, to ensure that the boundary of the cloth can be fixed on the nails on the nail plate 3.

[0033] During the rotation of the multi-slot circular tube 2, the cloth is driven into the cloth stretching machine through the nail plate 3. The cloth entering the cloth stretching machine is fixed on the nail plate 3. The guide wheel 301 of each nail plate 3 moves on the first guide surface 502 of the first guide cylinder 5. When approaching the second guide cylinder 6, the guide wheel 301 slides to the second guide surface 602 of the second guide cylinder 6, and guides the guide wheel 301 through the second guide surface 602 (elliptical inclined surface) to expand the cloth. When the cloth moves to the discharge port of the cloth stretching machine, the cloth is separated from the nail plate 3 to complete the expansion.

[0034] Directions and references (e.g., up, down, left, right, etc.) in the present invention may only be used to assist in the description of features in the accompanying drawings. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0035] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the scope of the present invention through the above description. The technical scope of this invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A cloth stretching machine, characterized in that: The invention comprises a multi-grooved circular tube (2), wherein a driving device for driving the multi-grooved circular tube (2) to rotate along an axis is provided on the multi-grooved circular tube (2), wherein a plurality of slideways (201) are provided on the multi-grooved circular tube (2) along the length direction, wherein two nail plates (3) for fixing the two sides of the cloth are slidably provided on both sides of the slideway (201), wherein an elastic rubber strip (4) is connected between the two nail plates (3) in the same slideway (201), wherein a guide wheel (301) is provided at the lower end of the nail plate (3), wherein a sensing system for sensing the boundary position of the cloth is provided on one side of the feeding port of the multi-grooved circular tube (2), and wherein two first guide cylinders (5) are provided on the inner side of the multi-grooved circular tube (2). and two second guide cylinders (6), the first guide cylinders (5) are provided with a first guide surface (502) cooperating with a guide wheel (301) on one side away from each other, the first guide cylinders (5) are provided with a first drive assembly for adjusting the position of the first guide cylinder (5) in real time according to the boundary position of the cloth, the second guide cylinders (6) are provided with a second guide surface (602) cooperating with the guide wheel (301) on one side away from each other, the second guide surface (602) is an elliptical inclined surface, and the second guide cylinders (6) are provided with a second drive assembly for adjusting the position of the two second guide cylinders (6) according to the required expansion width of the cloth.

2. A cloth stretching machine as claimed in claim 1, characterized in that: The nail plate (3) comprises a main plate (302), the guide wheel (301) and a plurality of pulleys (303) cooperating with the slideway (201) are arranged below the main plate (302), a connecting plate (304) is arranged above the main plate (302), a connecting groove (305) cooperating with the elastic rubber strip (4) is arranged on the connecting plate (304), a plurality of threaded holes (306) are arranged in the connecting groove (305), fixing bolts are passed through the threaded holes (306), a nail seat (307) is arranged at the upper end of the connecting plate (304), and a plurality of adjustment holes (308) cooperating with the nail seat (307) are arranged at intervals at the upper end of the connecting plate (304) along the length direction of the main plate (302).

3. A cloth stretching machine as claimed in claim 1, characterized in that: The first driving assembly comprises a first motor (7), a first lead screw (8), a guide rail (9) and an intermediate block (10); the first motor (7) is arranged on one side of the multi-grooved circular tube (2) and fixedly connected to the frame (1); the intermediate block (10) is arranged at a middle position inside the multi-grooved circular tube (2); a first transmission plate (501) is provided on the first guide cylinder (5); one end of the first lead screw (8) is connected to the output end of the first motor (7), and the other end is rotatably connected to the intermediate block (10); the first lead screw (8) passes through the first transmission plate (501) and is threadedly connected to the first transmission plate (501); one end of the guide rail (9) is connected to the intermediate block (10), and the other end is connected to the frame (1); the first transmission plate (501) is slidably connected to the guide rail (9).

4. A cloth stretching machine as claimed in claim 3, characterized in that: The second driving assembly comprises a second motor (11) and a second lead screw (12); the second motor (11) is arranged at the end of the multi-grooved circular tube (2) and is fixedly connected to the frame (1); the second guide cylinder (6) is sleeved on the outside of the first guide cylinder (5); a second transmission plate (601) is provided on the second guide cylinder (6); one end of the second lead screw (12) is connected to the output end of the second motor (11), and the other end is rotatably connected to the intermediate block (10); the second lead screw (12) passes through the second transmission plate (601) and is threadedly connected to the second transmission plate (601); and the second transmission plate (601) is slidably connected to the guide rail (9).

5. A cloth stretching machine as claimed in claim 4, characterized in that: A retaining frame (19) is provided on one side of the second transmission plate (601), and the retaining frame (19) includes a first bearing (1901), the inner ring of the first bearing (1901) is fixedly connected to the second transmission plate (601), the outer ring of the first bearing (1901) is supported on the inner side of the multi-groove circular tube (2), a plurality of second bearings (1902) are provided on the outer ring of the first bearing (1901) along the circumferential direction, and a plurality of sliding grooves matching the second bearings (1902) are provided on the inner wall surface of the multi-groove circular tube (2).

6. A cloth stretching machine as claimed in claim 4, characterized in that: The first transmission plate (501) is provided with a first avoidance hole corresponding to the position of the second lead screw (12), and the second transmission plate (601) is provided with a second avoidance hole corresponding to the position of the first lead screw (8).

7. A cloth stretching machine as claimed in claim 4, characterized in that: The sensing system comprises a detection plate (13) and a base (14); the detection plate (13) is provided with a U-shaped detection portion, the U-shaped detection portion is provided with two infrared sensors, and the base (14) is provided with a servo motor and a lead screw for driving the detection plate (13) to move along the width direction of the multi-grooved circular tube (2); the servo motor and the first motor (7) are both connected to a controller signal.

8. A cloth stretching machine as claimed in claim 7, characterized in that: The base (14) is provided with a cloth guide rod (15) for guiding the cloth into the U-shaped detection portion.

9. A cloth stretching machine as claimed in claim 1, characterized in that: Both ends of the multi-grooved circular tube (2) are rotatably connected to the frame (1) via bearings; the driving device comprises a driving tooth (16) and a driving motor (17); the driving tooth (16) is sleeved on one side of the multi-grooved circular tube (2); and the driving tooth (16) is drivingly connected to an output end of the driving motor (17).

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