Ultrasonic trimming device

Abstract

The utility model provides an ultrasonic trimming device, and belongs to the technical field of sewing. The technical problem that when an existing ultrasonic trimming device trims elastic cloth, the edge of the cloth is uneven is solved. The ultrasonic trimming device comprises a working table, a machine head, an ultrasonic generator and a cutter, the machine head is fixed to the working table, a blade of the cutter is opposite to the end face of the ultrasonic generator, a cloth feeding mechanism capable of intermittently driving cloth to move is arranged on the working table, and a lifting mechanism capable of driving the cutter to move up and down is arranged on the machine head. When the cloth feeding mechanism drives the cloth to move, the lifting mechanism lifts the cutter, and when the cloth feeding mechanism stops feeding the cloth, the lifting mechanism puts down the cutter, so that the cutting edge of the cutter is matched with the end face of the ultrasonic generator. The elastic cloth trimming device has the advantage that the edge obtained after the elastic cloth is trimmed is flat.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing and relates to an ultrasonic trimming device. Background Art

[0002] The fabric needs to be trimmed before sewing. Using a traditional cutter to cut the trimmed fabric will result in loose edges and fringes, and it is also impossible to achieve edge bonding and splicing. In order to solve the above problems, there is a structure that uses ultrasound to achieve trimming, such as an ultrasonic cloth cutting device and a sewing machine disclosed in Chinese patent documents [Authorization Announcement No. CN209873314U], a seamless bonding machine ultrasonic front cutting adjustable knife gluing machine [Authorization Announcement No. CN220052919U], etc., which use an ultrasonic generator and a circular cutter to achieve trimming. When in use, the circular cutter rotates while the fabric moves forward to cooperate with the ultrasonic generator to achieve trimming. Although the problems of loose edges and fringes are solved, the edges can also be bonded and spliced ​​at the same time. However, when it comes to elastic fabrics, the elastic fabrics will be pulled and deformed due to the friction of the work surface when they move. The existing ultrasonic cloth cutting device will trim, bond and splice the elastic fabrics while the elastic fabrics are moving. Since the edges of the elastic fabrics are in a pulled and deformed state during trimming, when the elastic fabrics return to their normal state and shrink, wrinkles will appear on the edges of the elastic fabrics after trimming, which cannot meet the flatness requirements of the fabrics. Utility Model Content

[0003] The utility model aims to solve the above problems in the prior art and proposes an ultrasonic trimming device. The technical problem solved by the utility model is to trim the edge of the cloth when it is stationary.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] An ultrasonic trimming device comprises a work surface, a machine head, an ultrasonic generator and a cutter, wherein the machine head is fixed on the work surface, and the blade of the cutter is arranged opposite to the end face of the ultrasonic generator. The device is characterized in that a cloth feeding mechanism capable of intermittently driving cloth to move is provided on the work surface, and a lifting mechanism capable of driving the cutter to move up and down is provided on the machine head. When the cloth feeding mechanism drives the cloth to move, the lifting mechanism lifts the cutter, and when the cloth feeding mechanism stops feeding the cloth, the lifting mechanism lowers the cutter so that the blade of the cutter cooperates with the end face of the ultrasonic generator.

[0006] When in use, the cloth is placed on the work surface, and the cloth is intermittently moved forward by the cloth feeding mechanism. The position of the cloth to be trimmed passes between the cutter and the ultrasonic generator. When the cloth feeding mechanism moves the cloth forward, the lifting mechanism lifts the cutter, and the cloth stops after completing one movement. The static cloth will return to a normal state without being subjected to external force. At the same time, the lifting mechanism puts down the cutter, and the cutter cooperates with the ultrasonic generator. Under the joint action of the ultrasonic generator and the cutter, the cloth is cut and bonded and spliced. After completion, the lifting mechanism lifts the cutter again, and the cloth feeding mechanism moves the cloth for a distance again, and the cloth is trimmed in this reciprocating manner. The movement and trimming of the cloth are performed at intervals separately, and the elastic cloth will return to a normal state without being subjected to force when static. The cloth is trimmed in a static normal state, so the edge of the cloth after trimming is smooth, thereby improving the trimming quality of the elastic cloth.

[0007] In the above ultrasonic trimming device, the feed mechanism includes a feed dog and a presser foot, the feed dog is arranged on the work surface and is located on one side of the ultrasonic generator, and the presser foot is installed on the machine head and is located directly above the feed dog. The feed dog and the presser foot adopt the relevant structure of the existing lockstitch sewing machine, when the feed dog moves forward horizontally, the cloth moves forward, and when the feed dog moves downward and retreats, the cloth stops moving, and the cooperation of the feed dog and the presser foot realizes driving the cloth to move intermittently.

[0008] In the above-mentioned ultrasonic trimming device, the cloth feeding mechanism includes a cloth feeding wheel and a cloth pressing wheel, the cloth feeding wheel is rotatably connected to the work surface, the upper side of the cloth feeding wheel is flush with the work surface, a stepping motor capable of intermittently driving the cloth feeding wheel to rotate is fixed on the work surface, the cloth pressing wheel is rotatably connected to the machine head and the cloth pressing wheel can be pressed against the cloth feeding wheel. The stepping motor can accurately control the rotation angle through a pulse signal, and the rotation angle of the cloth feeding wheel can be controlled by setting the rotation angle of the stepping motor each time, and the intermittent driving of the cloth feeding wheel to move the cloth is achieved by intermittently starting the stepping motor.

[0009] In the above ultrasonic trimming device, the lifting mechanism includes a guide rod and a cylinder, the guide rod is vertically arranged in the machine head and can move up and down relative to the machine head, the cylinder is fixed on the machine head, the piston rod of the cylinder is fixedly connected to the guide rod, and the cutter is installed at the lower end of the guide rod. The guide rod is driven up and down by the cylinder, and the extension or retraction time of the cylinder can be controlled by controlling the opening and closing of the solenoid valve of the cylinder, so as to move in accordance with the gap of the cloth, so as to realize the downward movement of the cutter for trimming when the cloth is stationary, and the upward movement of the cutter to make way when the cloth moves.

[0010] In the above-mentioned ultrasonic trimming device, a main shaft is rotatably arranged in the machine head, a proximity switch is arranged in the machine head near the main shaft, the proximity switch is electrically connected to the electromagnetic valve of the cylinder, a metal sheet is fixed on the main shaft, and the metal sheet can rotate with the main shaft to a position that triggers the proximity switch. The rotation of the main shaft can realize that the metal sheet periodically triggers the proximity switch, after the proximity switch is triggered, the electromagnetic valve of the cylinder is ventilated and opened, and the cylinder drives the cutter to move downward, and when the metal sheet does not trigger the proximity switch, the electromagnetic valve of the cylinder is de-aired and reset, and the cylinder drives the cutter to move upward.

[0011] In the above-mentioned ultrasonic trimming device, the lifting mechanism includes a guide rod, a turntable and a connecting rod. The guide rod is vertically arranged in the machine head and can move up and down relative to the machine head. The cutter is installed at the lower end of the guide rod. A main shaft is rotatably arranged in the machine head. The turntable is vertically fixed on the main shaft. A convex shaft is fixed at an eccentric position on the turntable. A sleeve is fixed on the guide rod. One end of the connecting rod is rotatably connected to the convex shaft, and the other end of the connecting rod is rotatably connected to the sleeve. The turntable is driven to rotate by the main shaft, and the eccentric rotation of the convex shaft on the turntable drives the connecting rod to move up and down. The connecting rod drives the guide rod to move up and down. The cycle of the up and down movement of the connecting rod cooperates with the gap movement of the cloth to realize that the cutter moves down to trim when the cloth is stationary, and the cutter moves up to make way when the cloth moves.

[0012] In the above ultrasonic trimming device, the blade of the cutter is in the shape of a straight strip, the end face of the ultrasonic generator is a plane, and the blade of the cutter can be in contact with the end face of the ultrasonic generator as a whole. The cutter of this structure can cut and glue together a fixed length of cloth at one time when the cloth stops moving, and the length of the blade of the cutter matches the travel of the cloth at one time.

[0013] In the above ultrasonic trimming device, the lower end of the guide rod is fixedly connected to a knife holder, a mounting vertical groove is provided on the side of the knife holder, a strip hole is vertically provided on the cutter, the cutter is located in the mounting vertical groove and is fixed to the knife holder by bolts passing through the strip hole. This structure can adjust the up and down position of the cutter.

[0014] In the above ultrasonic trimming device, the lower end of the guide rod is plugged and fixed to the upper end of the tool holder, a limit plate is transversely fixed on the tool holder, a positioning plate is fixed on the lower side of the machine head, and the end face of the limit plate is in contact with the positioning plate. The contact between the limit plate and the positioning plate can prevent the limit plate from rotating, thereby preventing the tool holder from rotating, thereby achieving circumferential positioning of the cutter, and preventing the cutter from deflecting due to the vibration of the ultrasonic generator.

[0015] Compared with the prior art, the ultrasonic trimming device has the advantage that the edge of the elastic fabric after trimming is smooth, thereby improving the trimming quality of the elastic fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the three-dimensional structure of the first embodiment.

[0017] Figure 2 It is a schematic diagram of the top view of the structure of the first embodiment.

[0018] Figure 3 yes Figure 1 Schematic diagram of the partial enlarged structure of part A in the middle.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure inside the nose in the first embodiment.

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the knife holder and the cutter.

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the second embodiment.

[0022] Figure 7 yes Figure 6 Schematic diagram of the partial enlarged structure of part B in the middle.

[0023] Figure 8 It is a schematic diagram of the internal structure of the front end of the nose in the second embodiment.

[0024] In the figure, 1. work surface; 11. machine head; 12. spindle; 13. positioning plate; 2. ultrasonic generator; 21. cutter; 22. strip hole; 3. feed dog; 4. presser foot; 5. guide rod; 51. bushing; 52. cylinder; 53. proximity switch; 54. metal sheet; 6. tool holder; 61. mounting vertical slot; 62. limit plate; 7. turntable; 71. cam shaft; 72. connecting rod. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] Embodiment 1

[0027] like Figures 1 to 5As shown, the ultrasonic trimming device includes a work surface 1, a machine head 11, an ultrasonic generator 2 and a cutter 21. The machine head 11 is fixed on the work surface 1, the ultrasonic generator 2 is fixed on the work surface 1, the end surface of the ultrasonic generator 2 extends out of the work surface 1, the blade of the cutter 21 is arranged opposite to the end surface of the ultrasonic generator 2, and a cloth feeding mechanism capable of intermittently driving the cloth to move is provided on the work surface 1. The cloth feeding mechanism includes a cloth feeding tooth 3 and a presser foot 4. The cloth feeding tooth 3 is arranged on the work surface 1 and is located on one side of the ultrasonic generator 2. The presser foot 4 is installed on the machine head 11 and is located directly above the cloth feeding tooth 3. The cutter 21 is connected to a lifting mechanism capable of driving it to move up and down. When the cloth feeding mechanism drives the cloth to move, the lifting mechanism lifts the cutter 21. When the cloth feeding mechanism stops feeding, the lifting mechanism lowers the cutter 21 so that the blade of the cutter 21 matches the end surface of the ultrasonic generator 2.

[0028] The lifting mechanism includes a guide rod 5 and a cylinder 52. The guide rod 5 is vertically arranged in the machine head 11 and can move up and down relative to the machine head 11. The cylinder 52 is fixed on the machine head 11. The piston rod of the cylinder 52 is fixedly connected to the guide rod 5. The cutter 21 is installed at the lower end of the guide rod 5. A spindle 12 is rotatably arranged in the machine head 11. A proximity switch 53 is arranged in the machine head 11 near the spindle 12. The proximity switch 53 is electrically connected to the solenoid valve of the cylinder 52. A metal sheet 54 is fixed on the spindle 12. The metal sheet 54 can rotate with the spindle 12 to a position that triggers the proximity switch 53. The spindle 12 drives the feed dog 3 to move. The position of the metal sheet 54 is installed according to actual conditions. When the spindle 12 rotates to the feed dog 3 and starts to move downward and retreat, the metal sheet 54 just rotates to a position that triggers the proximity switch 53. In this embodiment, the metal sheet 54 is 6 mm wide. The spindle 12 continues to rotate. 54 is always in the position of triggering the proximity switch 53. During this process, the cylinder 52 moves the cutter 21 down to the position matching the end face of the ultrasonic generator 2, and the feed dog 3 synchronously retracts. When the main shaft 12 rotates to the position where the metal sheet 54 is out of the position of triggering the proximity switch 53, the feed dog 3 completes the retraction action, and the trimming is completed at this time. The solenoid valve of the cylinder 52 is cut off to make the cylinder 52 rod reset upward, and the cylinder 52 drives the cutter 21 to move up, so that the cylinder 52 and the feed dog 3 cooperate to realize the action of lifting the cutter 21 when the cloth moves, and lowering the cutter 21 for trimming when the cloth is stationary.

[0029] The blade of the cutter 21 is in the shape of a straight strip, the end face of the ultrasonic generator 2 is a plane, the blade of the cutter 21 can contact the end face of the ultrasonic generator 2 as a whole, and the length of the blade of the cutter 21 matches the stroke of the cloth moving once. The lower end of the guide rod 5 is fixedly connected to the knife holder 6, and the side of the knife holder 6 is provided with a mounting vertical groove 61. The cutter 21 is vertically provided with a strip hole 22, and the cutter 21 is located in the mounting vertical groove 61 and is fixed to the knife holder 6 by passing a bolt through the strip hole 22. The lower end of the guide rod 5 is plugged and fixed to the upper end of the knife holder 6, and a limit plate 62 is horizontally fixed on the knife holder 6. A positioning plate 13 is fixed to the lower side of the machine head 11. In this embodiment, the positioning plate 13 is a section of the front end cover plate of the machine head 11 extending downward, and the end face of the limit plate 62 is in contact with the positioning plate 13. The contact between the limiting plate 62 and the positioning plate 13 can prevent the limiting plate 62 from rotating, thereby preventing the cutter 21 from deflecting due to the vibration of the ultrasonic generator 2 .

[0030] When in use, the cloth is placed on the work surface 1, and the cloth is intermittently moved forward by the cooperation of the feed dog 3 and the presser foot 4. The position where the cloth needs to be trimmed passes between the cutter 21 and the ultrasonic generator 2. When the feed dog 3 moves the cloth forward, the cylinder 52 lifts the cutter 21, and the cloth stops after completing one movement. The feed dog 3 moves down and resets. At this time, the static cloth will return to a normal state without being subject to external force, and at the same time, the cylinder 52 puts down the cutter 21, and the cutter 21 cooperates with the ultrasonic generator 2. Under the joint action of the ultrasonic generator 2 and the cutter 21, the cloth is cut and bonded and spliced. After completion, the cylinder 52 lifts the cutter 21 again, and the feed dog 3 moves the cloth forward again for a distance, and the cloth is trimmed in this reciprocating manner. The movement and trimming of the cloth are performed separately at intervals, and the cloth is trimmed in a static normal state. Therefore, the edge of the cloth after trimming is smooth, which improves the quality of the cloth trimming.

[0031] The feed dog 3 and the presser foot 4 are conventional structures on a flat-sewing sewing machine, such as a sewing machine feeding mechanism and a sewing machine [application number 202310038781.2], a sewing machine lifting tooth feeding drive mechanism and a sewing machine [application number 201710164197.6] disclosed in Chinese patent literature, etc. Therefore, the relevant structures for realizing the feed dog 3 and the presser foot 4 are not specifically described in this application.

[0032] Embodiment 2

[0033] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figures 6 to 8As shown, the lifting mechanism includes a guide rod 5, a turntable 7 and a connecting rod 72. The guide rod 5 is vertically arranged in the machine head 11 and can move up and down relative to the machine head 11. The cutter 21 is installed at the lower end of the guide rod 5. A main shaft 12 is rotatably provided in the machine head 11. The turntable 7 is vertically fixed on the main shaft 12. A cam 71 is fixed at an eccentric position on the turntable 7. A sleeve 51 is fixed on the guide rod 5. One end of the connecting rod 72 is rotatably connected to the cam 71, and the other end of the connecting rod 72 is rotatably connected to the sleeve 51. The main shaft 12 drives the feed dog 3 to move, and the initial position of the cam 71 on the turntable 7 is set according to actual conditions. When the main shaft 12 rotates until the feed dog 3 starts to move downward and retreat, the cam 71 just rotates to the downward rotation position, and the main shaft 12 continues to rotate, and the cam 71 moves downward with the connecting rod 72, and the connecting rod 72 drives the guide rod 5 to move downward, so that the cutter 21 and the end surface of the ultrasonic generator 2 are matched. When the cam 71 rotates to the lowest position, the feed dog 3 completes the retreat action, and the trimming is completed at this time. The main shaft 12 continues to rotate, and the cam 71 rotates upward to drive the connecting rod 72 to move upward, and the cutter 21 moves upward, so that the cutter 21 and the feed dog 3 cooperate to realize the action of lifting the cutter 21 when the cloth moves and lowering the cutter 21 for trimming when the cloth is stationary.

[0034] Embodiment 3

[0035] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that the cloth feeding mechanism includes a cloth feeding wheel and a cloth pressing wheel. The cloth feeding wheel is rotatably connected to the work surface, and the upper side of the cloth feeding wheel is flush with the work surface. A stepper motor capable of intermittently driving the cloth feeding wheel to rotate is fixed on the work surface. The cloth pressing wheel is rotatably connected to the machine head and the cloth pressing wheel can be pressed against the cloth feeding wheel. The stepper motor can accurately control the rotation angle through a pulse signal. The rotation angle of the cloth feeding wheel can be controlled by setting the rotation angle of the stepper motor each time according to the actual situation, thereby controlling the position of the cloth when it is transferred once. The intermittent driving of the cloth feeding wheel to move the cloth is achieved by intermittently starting the stepper motor.

[0036] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but this will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An ultrasonic trimming device, comprising a work surface (1), a machine head (11), an ultrasonic generator (2) and a cutter (21), wherein the machine head (11) is fixed on the work surface (1), and the blade of the cutter (21) is arranged opposite to the end face of the ultrasonic generator (2), characterized in that: The work surface (1) is provided with a cloth feeding mechanism capable of intermittently driving the cloth to move, and the machine head (11) is provided with a lifting mechanism capable of driving the cutter (21) to move up and down. When the cloth feeding mechanism drives the cloth to move, the lifting mechanism lifts the cutter (21), and when the cloth feeding mechanism stops feeding the cloth, the lifting mechanism lowers the cutter (21) so that the blade of the cutter (21) cooperates with the end surface of the ultrasonic generator (2).

2. The ultrasonic trimming device according to claim 1, characterized in that: The cloth feeding mechanism comprises a cloth feeding tooth (3) and a presser foot (4); the cloth feeding tooth (3) is arranged on a work surface (1) and is located on one side of an ultrasonic generator (2); and the presser foot (4) is installed on a machine head (11) and is located directly above the cloth feeding tooth (3).

3. The ultrasonic trimming device according to claim 1, characterized in that: The cloth feeding mechanism comprises a cloth feeding wheel and a cloth pressing wheel, the cloth feeding wheel is rotatably connected to a work surface (1), the upper side surface of the cloth feeding wheel is flush with the work surface (1), a stepping motor capable of intermittently driving the cloth feeding wheel to rotate is fixed on the work surface (1), the cloth pressing wheel is rotatably connected to a machine head (11), and the cloth pressing wheel can be pressed tightly against the cloth feeding wheel.

4. The ultrasonic trimming device according to claim 1, 2 or 3, characterized in that: The lifting mechanism comprises a guide rod (5) and a cylinder (52); the guide rod (5) is vertically arranged in the machine head (11) and can move up and down relative to the machine head (11); the cylinder (52) is fixed on the machine head (11); the piston rod of the cylinder (52) is fixedly connected to the guide rod (5); and the cutter (21) is mounted at the lower end of the guide rod (5).

5. The ultrasonic trimming device according to claim 4, characterized in that: A main shaft (12) is rotatably arranged in the machine head (11), a proximity switch (53) is arranged in the machine head (11) near the main shaft (12), the proximity switch (53) is electrically connected to the solenoid valve of the cylinder (52), a metal sheet (54) is fixed on the main shaft (12), and the metal sheet (54) can rotate with the main shaft (12) to a position that triggers the proximity switch (53).

6. The ultrasonic trimming device according to claim 1, 2 or 3, characterized in that: The lifting mechanism comprises a guide rod (5), a rotating disk (7) and a connecting rod (72); the guide rod (5) is vertically arranged in the machine head (11) and can move up and down relative to the machine head (11); the cutter (21) is mounted at the lower end of the guide rod (5); a main shaft (12) is rotatably arranged in the machine head (11); the rotating disk (7) is vertically fixed on the main shaft (12); a convex shaft (71) is fixed at an eccentric position on the rotating disk (7); a shaft sleeve (51) is fixed on the guide rod (5); one end of the connecting rod (72) is rotatably connected to the convex shaft (71); and the other end of the connecting rod (72) is rotatably connected to the shaft sleeve (51).

7. The ultrasonic trimming device according to claim 1, 2 or 3, characterized in that: The blade of the cutter (21) is in the shape of a straight strip, the end face of the ultrasonic generator (2) is a plane, and the blade of the cutter (21) can be in contact with the end face of the ultrasonic generator (2) as a whole.

8. The ultrasonic trimming device according to claim 4, characterized in that: The lower end of the guide rod (5) is fixedly connected to a knife holder (6), a side of the knife holder (6) is provided with a mounting vertical groove (61), a strip hole (22) is vertically provided on the cutter (21), and the cutter (21) is located in the mounting vertical groove (61) and is fixed to the knife holder (6) by means of bolts passing through the strip hole (22).

9. The ultrasonic trimming device according to claim 8, characterized in that: The lower end of the guide rod (5) is plugged and fixed to the upper end of the tool holder (6); a limit plate (62) is transversely fixed on the tool holder (6); a positioning plate (13) is fixed on the lower side of the machine head (11); and the end surface of the limit plate (62) is in contact with the positioning plate (13).

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