CN111501226A - Thread cutting device for column type sewing machine - Google Patents

Abstract

The invention relates to a thread trimming device for a column sewing machine, wherein the column sewing machine comprises a bottom plate (1) and a column base body (2) fixed on the bottom plate (1), a rotating shuttle (21) and a needle plate component (22) are arranged on the column base body (2), the thread trimming device comprises a cutter component (3), a movable cutter rotating seat (4) and a transmission mechanism (5), and the cutter component (3) comprises a fixed cutter (31) and a movable cutter (32) which are close to the needle plate component (22) and fixed on the column base body (2); the movable knife rotating seat (4) and the rotating shuttle (21) rotate coaxially, and a movable knife (32) is fixed on the movable knife rotating seat (4); the transmission mechanism (5) drives the movable knife rotating base (4) to drive the movable knife (32) to reciprocate, so that the movable knife (32) is matched with the fixed knife (31) to finish the wire shearing operation. The invention can reduce the distance between the fixed knife and the needle plate hole of the needle plate assembly, so that the residue of the upper thread and the bottom thread on the bottom of the sewn material after thread cutting can not be longer.

Description

Thread cutting device for column type sewing machine

Technical Field

The present invention relates generally to the field of pillar sewing machines. More particularly, the present invention relates to a thread trimming device for a column sewing machine.

Background

A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. The sewing machine can sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitches are neat, beautiful, flat and firm, and have the characteristics of high sewing speed and simple and convenient use.

The rotating shuttle of the existing column type sewing machine is a vertical rotating shuttle, the thread cutting structure arranged on the column type sewing machine is matched with the vertical rotating shuttle for use, and the fixed knife of the thread cutting structure matched with the vertical rotating shuttle is far away from a needle plate hole of the column type sewing machine, so that the existing column type sewing machine has the problem that the upper thread and the bottom thread on the bottom of a sewing material are remained for a long time after thread cutting, secondary trimming is needed manually, and the processing cost of sewing is correspondingly increased.

Disclosure of Invention

In view of the above-mentioned drawbacks in the prior art, an object of the present invention is to provide a thread trimming device for a column-type sewing machine, which can reduce the distance between a stationary knife and a needle plate assembly, thereby reducing the distance between the stationary knife and a needle plate hole of the needle plate assembly, so that the residue of upper thread and bottom thread on the bottom of the trimmed material will not be longer.

In order to achieve the purpose, the invention provides the following technical solutions:

in one aspect, the present invention provides a thread trimming device for a column sewing machine, the column sewing machine including a bed plate and a column base fixed to the bed plate, the column base being provided with a rotating shuttle and a needle plate assembly, wherein the thread trimming device includes:

the cutter assembly comprises a fixed cutter close to the needle plate assembly and fixed on the stand column base body and a movable cutter which coaxially rotates with the rotating shuttle;

the movable knife rotating seat is rotationally fixed in the upright post seat body and coaxially rotates with the rotating shuttle, and the movable knife is fixed on the movable knife rotating seat; and

and the transmission mechanism drives the movable cutter rotating seat to drive the movable cutter to reciprocate around the axis of the rotating shuttle so that the movable cutter is matched with the fixed cutter to finish the thread trimming operation.

In one embodiment, wherein the transmission mechanism comprises:

the thread trimming swing rod is rotationally fixed on the bottom plate, a thread trimming roller is arranged on the thread trimming swing rod, and one end of the thread trimming swing rod acts on the movable cutter rotating seat so as to enable the movable cutter rotating seat to rotate around the axis of the rotating shuttle in a reciprocating mode;

the driving device acts on the other end of the trimming swing rod to drive the trimming swing rod to rotate;

and the cam is fixed on the lower shaft, and when the driving device drives the trimming swinging rod to rotate to the maximum stroke, the cam and the lower shaft synchronously rotate and act on the trimming roller, so that the trimming swinging rod is restored to the initial position of starting to rotate.

In one embodiment, one end of the trimming swing rod acts on the movable cutter rotating seat through a trimming pull rod, a groove matched with the trimming pull rod in shape is formed in the upright seat body, the trimming pull rod is located in the groove, and when the driving device drives the trimming swing rod to rotate, the trimming pull rod moves in the groove along the axial direction of the trimming pull rod.

In one embodiment, a transverse groove intersecting with the self-moving direction is formed in the thread trimming pull rod, a rotating roller located in the transverse groove is arranged on the movable cutter rotating base, and when the thread trimming pull rod moves along the self-moving direction, the rotating roller reciprocates in the transverse groove so that the movable cutter rotating base rotates around the axis of the rotating shuttle.

In one embodiment, a pressing plate is arranged on the upright post seat body and fixed at the groove to limit the trimming pull rod to be positioned in the groove.

In one embodiment, a universal assembly is further arranged between the trimming swing rod and the trimming pull rod, and the universal assembly changes the direction of an acting force acting on the trimming swing rod when the trimming swing rod rotates and acts on the trimming pull rod, so that the trimming pull rod moves along the axial direction of the trimming pull rod.

In one embodiment, the universal assembly comprises a universal connecting rod, a crank oscillating rod and a universal ball head assembly which are connected in sequence, the universal connecting rod is rotatably connected with the trimming oscillating rod and transmits acting force generated when the trimming oscillating rod rotates to the crank oscillating rod, the crank oscillating rod is rotatably fixed on the bottom plate and transmits the acting force transmitted by the universal connecting rod to the universal ball head assembly in a direction changing manner, and the universal ball head assembly is rotatably connected with the trimming pull rod and transmits the acting force generated after the crank oscillating rod changes the direction to the trimming pull rod.

In one embodiment, the crank oscillating rod is connected with the universal ball head assembly through a universal connecting block, the universal ball head assembly comprises a universal ball head and a universal ball head connecting rod, one end of the universal ball head connecting rod is rotatably connected with the universal ball head, the universal connecting block comprises a first connecting block and a second connecting block, the second connecting block is rotatably connected with the first connecting block, the first connecting block is fixed with the crank oscillating rod, and the second connecting block is fixed with the other end of the universal ball head connecting rod.

In one embodiment, the thread cutting device further comprises a return spring, two ends of the return spring are respectively fixed on the universal connecting rod and the bottom plate, and when the driving device drives the thread cutting swinging rod to rotate and enables the universal connecting rod to move, the return spring pulls the universal connecting rod, so that the universal connecting rod has an acting force in a direction opposite to the self-movement direction.

In one embodiment, the driving device comprises a trimming electromagnet and a trimming electromagnet core, and the trimming electromagnet is electrified to drive the trimming electromagnet core to move towards the trimming swinging rod.

Compared with the prior art, the fixed knife of the cutting knife assembly is arranged close to the needle plate assembly, so that the distance between the fixed knife and the needle plate assembly can be reduced, the distance between the fixed knife and a needle plate hole of the needle plate assembly is reduced, and the situation that long residues are left on the upper threads and the bottom threads at the bottom of the sewing material after the fixed knife and the movable knife are matched for thread cutting is avoided. Meanwhile, due to the arrangement of the movable cutter rotating seat, the movable cutter fixed on the movable cutter rotating seat can rotate around the rotating shuttle, so that the space occupied by the independent rotation of the movable cutter can be saved, and the space utilization rate of the stand body is correspondingly improved.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

fig. 1 is a schematic view showing the structure of a thread trimming apparatus according to the present invention;

fig. 2 is a schematic view showing the structure of a thread trimming apparatus according to the present invention;

fig. 3 is a partially enlarged schematic view showing a column base of the thread trimming apparatus according to the present invention;

fig. 4 is a schematic structural view showing a column housing of the thread trimming apparatus according to the present invention;

figures 5a-5c are a number of schematic views illustrating the thread cutting apparatus according to the invention at the start of thread cutting;

FIGS. 6a-6c are various schematic views showing the movable and stationary blades of a thread cutting device according to the present invention in cooperation with thread cutting; and

fig. 7a-7c are various schematic views showing the thread cutting device according to the present invention after the thread cutting is completed.

Detailed Description

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

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic view showing the structure of a thread trimming apparatus according to the present invention; fig. 2 is a schematic view showing the structure of a thread trimming apparatus according to the present invention; fig. 3 is a partially enlarged schematic view illustrating a column housing of the thread trimming apparatus according to the present invention. As shown in fig. 1 to 3, an embodiment of the present invention provides a thread cutting device, which may include a cutter assembly 3, a movable cutter rotating base 4 and a transmission mechanism 5, and the thread cutting device of the present invention may be used for thread cutting operation of a column-type sewing machine, which may include a base plate 1 and a column base body 2 fixed on the base plate 1, wherein the column base body 2 is provided with a rotating shuttle 21 and a needle plate assembly 22. In one embodiment, the cutter assembly 3 includes a stationary blade 31 adjacent to the needle bar assembly 22 and fixed to the column housing 2, and a movable blade 32 rotating coaxially with the rotary hook 21. In addition, the movable knife rotating base 4 is rotationally fixed in the upright post base body 2, the movable knife rotating base 4 and the rotating shuttle 21 rotate coaxially, and the movable knife 32 is fixed on the movable knife rotating base 4. Further, the transmission mechanism 5 drives the movable blade rotating base 4 to drive the movable blade 32 to reciprocate around the axis of the rotating shuttle 21, so that the movable blade 32 cooperates with the fixed blade 31 to complete the thread trimming operation.

In actual operation, the transmission mechanism 5 drives the movable blade rotating base 4 and drives the movable blade 32 to rotate around the axis of the rotating shuttle 21, so that the movable blade 32 cooperates with the fixed blade arranged close to the needle plate assembly 22 to complete the thread cutting operation. Since the fixed knife 31 of the cutter assembly 3 of the invention is arranged close to the needle board assembly 22, the distance between the fixed knife 31 and the needle board assembly 22 is reduced, so that the distance between the fixed knife 31 and the needle board hole of the needle board assembly 22 can be reduced, and the upper threads 81 and the bottom threads 82 (shown in fig. 5 c) on the bottom of the sewing material after the fixed knife 31 and the movable knife 32 are matched for thread cutting can not be left for a long time. Meanwhile, due to the arrangement of the movable knife rotating seat 4, the movable knife 32 fixed on the movable knife rotating seat 4 can rotate around the rotating shuttle 21, so that the space occupied by the independent rotation of the movable knife 31 can be saved, and the space utilization rate in the stand column seat body 2 is correspondingly improved.

As shown in fig. 1 and 2, the transmission mechanism 5 of the present invention may include a trimming swing lever 51, a driving device 52, and a cam 53. Wherein, the thread cutting swing lever 51 is rotatably fixed on the bottom plate 1, the thread cutting roller 511 is arranged on the thread cutting swing lever 51, and one end of the thread cutting swing lever 51 acts on the movable cutter rotating seat 4, so as to make the movable cutter rotating seat 4 rotate around the axis of the rotating shuttle 21 in a reciprocating manner. In addition, the driving device 52 acts on the other end of the thread trimming swing lever 51 to drive the thread trimming swing lever 51 to rotate. The structure of the trimming swing lever 51 rotatably fixed to the base plate 1 can be selected as required. In one embodiment, the wire cutting swing rod 51 is provided with a through hole, and the base plate 1 is fixed with a screw passing through the through hole of the wire cutting swing rod 51. In another embodiment, a trimming swing lever seat is fixed on the bottom plate 1, and a shaft pin is rotatably fixed on the trimming swing lever seat, and a through hole is formed in the shaft pin, and the trimming swing lever 51 penetrates through and is partially positioned in the through hole. Further, the width of the portion of the trimming swing lever 51 located inside the through hole is smaller than the width of the trimming swing lever 51 located outside the through hole. In addition, the configuration of the driving device 52 may be selected as needed. In one embodiment, the drive device 52 may be a hydraulic cylinder. In another embodiment, the driving device 52 may include a trimming electromagnet 521 and a trimming electromagnet core 522, and the trimming electromagnet 521 is energized to drive the trimming electromagnet core 522 to move toward the trimming swing lever 51.

In actual operation, the cam 53 is fixed to the lower shaft 6, and when the driving device 52 drives the trimming swing lever 51 to rotate to the maximum stroke, the cam 53 rotates in synchronization with the lower shaft 6 and acts on the trimming roller 511 to restore the trimming swing lever 51 to the initial position where the rotation is started. Further, the cam 53 may be a cylinder with a notch, and when the trimming swing lever 51 rotates to the maximum stroke, the trimming roller 511 on the trimming swing lever 51 is located in the notch of the cylinder (as shown in fig. 5 a). In an application scenario, the driving device 52 may be controlled to be turned off and on by an electronic control device. When the sewing process is performed and the thread cutting operation is required, the electric control device sends out a thread cutting signal, the driving device 52 receives the signal and applies an acting force to the thread cutting swing rod 51 along the direction indicated by the arrow in fig. 1 to rotate the thread cutting swing rod 51, so that the thread cutting swing rod 51 acts on the movable cutter rotating base 4 and finally drives the movable cutter 32 to rotate around the rotating shuttle 21. When the driving device 52 receives a signal for trimming, the cam 53 fixed to the lower shaft 6 rotates the lower shaft 6 so that the cam 53 does not act on the trimming swing lever 51 when the trimming swing lever 51 does not rotate to the maximum stroke. When the trimming swing lever 51 is rotated to the maximum stroke, the lower shaft 6 is rotated to rotate the cam 53 and act on the trimming swing lever 51, so that the trimming swing lever 51 obtains a force against the driving device 52 to change toward the initial state of the trimming swing lever 51. When the cam 53 acts on the thread cutting swing lever 51 and causes the thread cutting swing lever 51 to be in the initial state, the fixed blade 31 and the movable blade 32 have been engaged to complete the thread cutting operation, and the movable blade 32 is in the initial state when the thread cutting operation is not performed.

Fig. 4 is a schematic structural view showing a column housing of the thread trimming apparatus according to the present invention. Referring to fig. 2 and 4, one end of the trimming swing rod 51 can act on the movable blade rotating base 4 through the trimming pull rod 54, a groove with a shape matching the trimming pull rod 54 can be formed on the upright base 2, the trimming pull rod 54 is located in the groove, and when the driving device 52 drives the trimming swing rod 51 to rotate, the trimming pull rod 54 moves in the groove along the axial direction of itself. When the driving device 52 does not act on the trimming swing lever 51, the trimming pull rod 54 is located at the uppermost position of the groove in fig. 4. When the driving device 52 acts on the wire cutting swing rod 51 to rotate, the wire cutting swing rod 51 acts on the wire cutting pull rod 54 to move in the groove (in the downward direction of the arrow in fig. 4). When the trimming swing lever 51 is rotated to the maximum stroke, the cam 53 will start to act on the trimming swing lever 51 to drive the trimming pull rod 54 to move in the groove in the direction indicated by the arrow in fig. 4. Furthermore, a pressing plate 23 is arranged on the upright post seat body 2, and the pressing plate 23 is fixed at the groove to limit the position of the trimming pull rod 54 in the groove. In addition, when the pressing plate 23 is fixed on the stand column base body 2, the pressing plate 23 is embedded on the stand column base body 1, so that the pressing plate 23 cannot protrude out of the surface of the stand column base body 1, and the arrangement mode can avoid the situation that the pressing plate 23 protrudes out of the surface of the stand column base body 1 and is scratched by other objects under the condition that the position of the pressing plate 23 is limited. Meanwhile, a limiting groove for accommodating part of the pressing plate 23 is formed in the trimming pull rod 54, and when the trimming pull rod 54 moves downwards to the lowest position, the pressing plate 23 abuts against the inner wall above the limiting groove. Correspondingly, when the wire cutting pull rod 54 moves upwards to the highest position, the pressing plate 23 abuts against the inner wall below the limiting groove. Due to the arrangement of the limiting groove on the trimming pull rod 54, the trimming pull rod 54 can play a limiting role when moving to the highest position and the lowest position in the groove, and the damage of the connection part between the trimming pull rod 54 and the movable knife rotating seat 4 caused by the continuous action of the acting force when the trimming pull rod 54 moves to the highest position or the lowest position is avoided.

In one embodiment, as shown in fig. 1, 2 and 4, a universal assembly 55 may be further disposed between the wire cutting swing rod 51 and the wire cutting pull rod 54, and the universal assembly 55 changes the direction of the acting force acting on the wire cutting swing rod 51 when the wire cutting swing rod rotates and acts on the wire cutting pull rod 54, so that the wire cutting pull rod 54 moves along the axial direction of the wire cutting pull rod 54. Further, the universal assembly 55 may include a universal connecting rod 551, a crank swing rod 552 and a universal ball assembly 553, which are connected in sequence, the universal connecting rod 551 is rotatably connected with the trimming swing rod 51 and transmits the acting force generated when the trimming swing rod 51 rotates to the crank swing rod 552, the crank swing rod 552 is rotatably fixed on the bottom plate 1 and transmits the acting force transmitted by the universal connecting rod 551 to the universal ball assembly 553, and the universal ball assembly 553 is rotatably connected with the trimming pull rod 54 and transmits the acting force generated after the crank swing rod 552 changes the direction to the trimming pull rod 54. When the driving device 52 acts on the wire cutting oscillating rod 51 to rotate, firstly, the wire cutting oscillating rod 51 transmits a force to the universal link 551 rotationally connected with the wire cutting oscillating rod, so that the universal link 551 moves along the axial direction of itself (as indicated by an arrow at the universal link 551 in fig. 1 and 2). Universal link 551 then transmits the force to a crank lever 552 rotationally connected thereto, causing crank lever 552 to rotate about a rotational axis (as indicated by the arrow shown at crank lever 552 in fig. 1 and 2) that is fixed to base plate 1 by the rotational axis. Then, since crank oscillating rod 552 rotates by the action of the force, the direction of the force applied from crank oscillating rod 552 to universal ball element 553 changes, and universal ball element 553 moves in its axial direction. Finally, the force of the driving device 52 is finally transmitted to the thread cutting pull rod 54 by the universal ball head assembly 553 to drive the movable blade rotating base 4 to rotate around the rotary shuttle 21.

In one embodiment, crank rocker 552 and universal ball joint assembly 553 may be coupled by a universal coupling block 554, and universal ball joint assembly 553 may include a universal ball 555 and a universal ball link 556 rotatably coupled at one end to universal ball 555. Wherein the universal coupling block 554 may include a first coupling block 557 and a second coupling block 558 rotatably connected to the first coupling block 557, the first coupling block 557 being fixed to the crank swing lever 552, the second coupling block 558 being fixed to the other end of the universal ball-head link 556. When the crank oscillating lever 552 rotates due to the action of the universal connecting rod 551, since the first coupling block 557 is rotatably connected to the second coupling block 558 and the second coupling block 558 is fixed to the universal ball head connecting rod 556, the crank oscillating lever 552 rotates the universal coupling block 554 around the rotation axis of the crank oscillating lever 552, and the first coupling block 557 and the second coupling block 558 relatively rotate, so that the direction of the acting force is changed, and the acting force acting on the universal ball head assembly 553 is in the axial direction of the universal ball head assembly 553 itself. Since the position of the connection between the crank swing lever 552 and the universal coupling block 554 changes to be arc when the crank swing lever 552 rotates, the universal ball 555 and the universal ball connecting rod 556 are connected in a manner capable of rotating in multiple directions, so that the acting force of the universal ball assembly 553 acting on the shear pull rod 54 when the crank swing lever 552 rotates is in the axial direction of the shear pull rod 54. When universal bulb 555 and universal bulb connecting rod 556 are fixed connection, because the motion trail of the junction of crank swinging rod 552 and universal bulb connecting rod 556 when rotating is arc-shaped for universal bulb connecting rod 556 has an acting force in the direction crossing with self axial, finally leads to the condition that bending or even breaking occurs between universal bulb connecting rod 556 and universal bulb 555.

In one or more embodiments, the thread cutting device further comprises a return spring 7, two ends of the return spring 7 are respectively fixed on the universal connecting rod 551 and the base plate 1, when the driving device 52 drives the thread cutting swinging rod 51 to rotate and move the universal connecting rod 551, the return spring 7 pulls the universal connecting rod 551, so that the universal connecting rod 551 has an acting force opposite to the self movement. When the driving device 52 acts on the wire cutting oscillating rod 51 to rotate, the wire cutting oscillating rod 51 transmits a force to the universal link 551, so that the universal link 551 moves in the axial direction of itself. Since the driving device 52 is not directly fixed to the trimming swing lever 51, the trimming swing lever 51 may shake during rotation when the driving device 52 acts on the trimming swing lever 51. An additional acting force opposite to the acting force transmitted to the universal connecting rod 551 by the trimming swinging rod 51 can be applied to the universal connecting rod 551 through the arranged return spring 7, so that the trimming swinging rod 51 has an acting force resisting the driving of the driving device 52, the shaking of the trimming swinging rod 51 can be inhibited, the trimming roller 511 on the trimming swinging rod 51 can not collide with the cam 53, accordingly, the damage of the trimming roller 511 colliding with the cam 53 can be reduced, and the noise generated in the collision can be reduced. Further, when the driving device 52 drives the trimming swing rod 51, the return spring 7 is still in a tightened state, the return spring 7 acts on the universal connecting rod 551, and finally the trimming swing rod 51 is close to the trimming electromagnet core 522 of the driving device 52, so that the situation that the trimming swing rod 51 shakes when the trimming device does not perform trimming operation can be reduced.

In order to facilitate those skilled in the art to understand the structure and principle of the thread cutting device according to the embodiments of the present invention without any error, the thread cutting operation of the thread cutting device will be described in detail below.

Fig. 5a-5c are a number of schematic views showing the beginning of the cutting of a thread cutting device according to the invention. As shown in fig. 5a and 5b, when the driving device 52 drives the thread cutting oscillating rod 51 to rotate to the maximum stroke, the thread cutting roller 511 of the thread cutting oscillating rod 51 moves into the notch of the cam 53, the universal connecting rod 551 moves along its own axial direction and drives the crank oscillating rod 552 to rotate, and the crank oscillating rod 552 drives the universal ball assembly 553 to move through the universal connecting block 554, so that the thread cutting pull rod 54 moves along its own axial direction, and the movable cutter rotating base 4 rotates around the axis of the rotating shuttle 21. As further shown in fig. 5c, the thread trimming pull rod 54 is provided with a transverse groove 541 intersecting with the moving direction thereof, the movable blade rotating base 4 is provided with a rotating roller 41 located in the transverse groove 541, and when the thread trimming pull rod 54 moves in the self direction, the rotating roller 41 reciprocates in the transverse groove 541 to rotate the movable blade rotating base 4 about the axis of the rotary hook 21. Wherein the rotary roller 41 is located at the same position in the transverse groove 541 when the shear pull rod 54 is located at the highest and lowest positions. When the trimming swing lever 51 is rotated to the maximum stroke, the trimming pull rod 54 moves from the uppermost position to the lowermost position, and the corresponding rotating roller 41 slides in the transverse groove 541 and returns to the initial position. During the sliding of the rotating roller 41, the movable blade rotating base 4 rotates accordingly, and drives the movable blade 32 to rotate to the position shown in fig. 5 c. The upper thread 81 and the lower thread 82 which need to be cut can enter the thread hooking groove of the movable blade 32 through the thread hooking part of the movable blade 32.

Fig. 6a-6c are various schematic views showing the movable and stationary blades of the thread cutting device according to the present invention in cooperation with thread cutting. As shown in fig. 6a and 6b, the cam 53 starts to abut against the trimming roller 511 by the lower shaft 6 when the trimming swing lever 51 rotates to the maximum stroke, so that the trimming swing lever 51 has a tendency to return to the initial position where the rotation is started. As further shown in fig. 6c, the movable blade 32 will start to drive the upper thread 81 and the bottom thread 82 in the thread hooking groove to move towards the fixed blade 31.

Fig. 7a-7c are various schematic views showing the thread cutting device according to the present invention after the thread cutting is completed. As shown in fig. 7a-7c, the cam 53 is driven by the lower shaft 6 to act on the trimming roller 511, so that the trimming swing rod 51 is restored to the initial position of starting rotation, during the restoration process of the trimming swing rod 51, the universal connecting rod 551 moves along its own axial direction and drives the crank swing rod 552 to rotate, and the crank swing rod 552 drives the universal ball assembly 553 to move through the universal coupling block 554, so that the trimming pull rod 54 moves along its own axial direction, and the movable knife rotating base 4 rotates around the axis of the rotary shuttle 21. When the thread cutting swing lever 51 returns to the initial position where the rotation is started, the thread cutting pull rod 54 moves from the lowest position to the highest position, and the corresponding rotating roller 41 slides in the transverse groove 541 and returns to the initial position. During the sliding of the rotating roller 41, the movable blade rotating base 4 correspondingly rotates, and drives the movable blade 32 to rotate from the position shown in fig. 5c to the position shown in fig. 7 c. During the rotation of the movable knife 32, the upper thread 81 and the bottom thread 82 in the thread hooking groove are matched by the rotating movable knife 32 and the fixed knife 31 to form a scissor-like action mechanism so as to complete the thread cutting operation of the upper thread 81 and the bottom thread 82.

It should be understood that the terms "first," "second," "third," and "fourth," etc. in the claims, description, and drawings of the present disclosure are used to distinguish between different objects and are not used to describe a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this disclosure, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the disclosure. As used in the specification and claims of this disclosure, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the specification and claims of this disclosure refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.

As used in this specification and claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".

Although the embodiments of the present invention are described above, the descriptions are only examples for facilitating understanding of the present invention, and are not intended to limit the scope and application scenarios of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides a thread trimming device for column sewing machine, column sewing machine include bottom plate (1) and be fixed in stand pedestal (2) on bottom plate (1), be equipped with rotating shuttle (21) and faller subassembly (22) on stand pedestal (2), wherein thread trimming device includes:

the cutter assembly (3) comprises a fixed cutter (31) which is close to the needle plate assembly (22) and fixed on the upright post base body (2), and a movable cutter (32) which coaxially rotates with the rotating shuttle (21);

the movable knife rotating seat (4) is rotationally fixed in the upright post seat body (2), the movable knife rotating seat (4) and the rotating shuttle (21) rotate coaxially, and the movable knife (32) is fixed on the movable knife rotating seat (4); and

the transmission mechanism (5) drives the movable knife rotating seat (4) to drive the movable knife (32) to reciprocate around the axis of the rotating shuttle (21), so that the movable knife (32) is matched with the fixed knife (31) to finish the wire shearing operation.

2. The thread trimming device according to claim 1, wherein the transmission mechanism (5) comprises:

the thread trimming swing rod (51), the thread trimming swing rod (51) is rotationally fixed on the bottom plate (1), a thread trimming roller (511) is arranged on the thread trimming swing rod (51), and one end of the thread trimming swing rod (51) acts on the movable cutter rotating seat (4) so that the movable cutter rotating seat (4) can rotate around the axis of the rotating shuttle (21) in a reciprocating manner;

the driving device (52) acts on the other end of the trimming swinging rod (51) to drive the trimming swinging rod (51) to rotate;

the cam (53) is fixed on the lower shaft (6), and when the driving device (52) drives the trimming swinging rod (51) to rotate to the maximum stroke, the cam (53) rotates synchronously with the lower shaft (6) and acts on the trimming roller (511) so as to restore the trimming swinging rod (51) to the initial position of starting rotation.

3. The trimming device according to claim 2, wherein one end of the trimming swing rod (51) acts on the movable cutter rotating base (4) through a trimming pull rod (54), a groove matched with the trimming pull rod (54) in shape is formed in the upright base body (2), the trimming pull rod (54) is located in the groove, and when the driving device (52) drives the trimming swing rod (51) to rotate, the trimming pull rod (54) moves in the groove along the axial direction of the trimming pull rod (54).

4. The thread trimmer according to claim 3, wherein the thread trimming pull rod (54) is provided with a transverse groove (541) intersecting with the moving direction thereof, the movable blade rotating base (4) is provided with a rotating roller (41) positioned in the transverse groove (541), and when the thread trimming pull rod (54) moves in the self direction, the rotating roller (41) reciprocates in the transverse groove (541) to rotate the movable blade rotating base (4) around the axis of the rotary shuttle (21).

5. The thread trimming device according to claim 3, wherein a pressing plate (23) is provided on the upright seat (2), and the pressing plate (23) is fixed at the groove to limit the thread trimming pulling rod (54) to be located in the groove.

6. The thread trimming device according to claim 3, wherein a universal assembly (55) is further arranged between the thread trimming swing rod (51) and the thread trimming pull rod (54), and the universal assembly (55) changes the direction of the acting force acting on the thread trimming swing rod (51) when the thread trimming swing rod rotates and acts on the thread trimming pull rod (54) so that the thread trimming pull rod (54) moves along the axial direction of the thread trimming pull rod.

7. The thread trimming apparatus according to claim 6, wherein the gimbal assembly (55) comprises a gimbal link (551), a crank oscillating rod (552) and a gimbal ball assembly (553) which are connected in sequence, the gimbal link (551) is rotatably connected with the thread trimming oscillating rod (51) and transmits the force generated by the rotation of the thread trimming oscillating rod (51) to the crank oscillating rod (552), the crank oscillating rod (552) is rotatably fixed on the base plate (1) and transmits the force transmitted by the gimbal link (551) to the gimbal ball assembly (553), and the gimbal ball assembly (553) is rotatably connected with the thread trimming pull rod (54) and transmits the force generated by the direction change of the crank oscillating rod (552) to the thread trimming pull rod (54).

8. The wire cutting device according to claim 7, wherein the crank oscillating rod (552) and the universal ball head assembly (553) are connected by a universal coupling block (554), the universal ball head assembly (553) comprises a universal ball head (555) and a universal ball head connecting rod (556) with one end rotatably connected with the universal ball head (555), the universal coupling block (554) comprises a first coupling block (557) and a second coupling block (558) rotatably connected with the first coupling block (557), the first coupling block (557) is fixed with the crank oscillating rod (552), and the second coupling block (558) is fixed with the other end of the universal ball head connecting rod (556).

9. The thread trimming apparatus according to claim 7, further comprising a return spring (7), wherein both ends of the return spring (7) are respectively fixed on the universal link (551) and the base plate (1), and when the driving device (52) drives the thread trimming swinging rod (51) to rotate and move the universal link (551), the return spring (7) pulls the universal link (551) so that the universal link (551) has a force in a direction opposite to the self-movement.

10. The thread trimming apparatus according to claim 2, wherein the driving means (52) comprises a thread trimming electromagnet (521) and a thread trimming electromagnet core (522), the thread trimming electromagnet (521) being energized to drive the thread trimming electromagnet core (522) to move toward the thread trimming swing lever (51).

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