CN220318129U - Thread cutting mechanism of sewing machine - Google Patents

Abstract

The utility model provides a thread cutting mechanism of a sewing machine, and belongs to the technical field of sewing machines. The problem that stability of tool rest motion and wire shearing effect are difficult to guarantee in the prior art is solved. The thread cutting mechanism of the sewing machine comprises a machine base and a movable cutter frame movably arranged on the machine base, wherein two ends of the movable cutter frame are respectively fixedly connected with sliding rails, the positions, corresponding to the two sliding rails, on the machine base are respectively fixedly connected with sliding blocks, the sliding rails are slidably connected onto the sliding blocks, and the thread cutting mechanism further comprises a linkage assembly capable of driving the two sliding rails to synchronously move. The utility model has the advantage of improving the stability of the thread cutting mechanism and the thread cutting effect.

Description

Thread cutting mechanism of sewing machine

Technical Field

The utility model belongs to the technical field of sewing machines, and relates to a thread cutting mechanism of a sewing machine.

Background

The multi-needle sewing machine, which is called multi-needle machine for short, is widely applied in decorative sewing, and can realize functions of pleating, cable beating, rubber band wrinkling and the like after the auxiliary device is added on the multi-needle machine.

The existing multi-needle sewing machine generally comprises a thread cutting mechanism, for example, chinese patent literature discloses an automatic thread cutting mechanism (application number: 201821424351.5) of the multi-needle sewing machine, which comprises a seat plate, a movable cutter set, a fixed cutter set and a cylinder, wherein a sliding groove is formed in the seat plate, the movable cutter set is arranged in the sliding groove and comprises a movable cutter, a movable cutter rest and a dust removing elastic sheet, the movable cutter rest is fixedly provided with the movable cutter, and the dust removing elastic sheet is arranged between the movable cutter and the movable cutter rest; the movable knife set is connected with an air cylinder, the air cylinder drives the movable knife rest to reciprocate, the fixed knife set matched with the movable knife set is fixed on the seat board, the dust removing elastic sheet is attached to the movable knife, and when the movable knife reciprocates, the dust removing elastic sheet is in tangential contact with the fixed knife set. Although the automatic thread cutting mechanism of the multi-needle machine can realize the functions of automatic thread cutting and automatic dust cleaning, the following defects exist in the use process: the movable tool rest of the automatic thread trimming mechanism of the multi-needle machine is driven by the two air cylinders to reciprocate at the same time, so that the synchronization of the actions of the two air cylinders is difficult to ensure in the actual use process, the stress at the two ends of the movable tool rest is unbalanced, and the stability of the movement of the tool rest and the thread trimming effect are difficult to ensure.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provides a thread cutting mechanism of a sewing machine. The utility model aims to solve the technical problem of improving the stability and the wire cutting effect of a wire cutting mechanism.

The aim of the utility model can be achieved by the following technical scheme:

the utility model provides a sewing machine's thread cutting mechanism, includes frame and movable knife rest that movably set up on the frame, its characterized in that, the both ends of movable knife rest have linked firmly the slide rail respectively, the position that corresponds two slide rails on the frame has linked firmly the slider respectively, the slide rail slidable is connected on the slider, this thread cutting mechanism still includes the linkage subassembly that can drive two slide rails synchronous motion.

Compared with the prior art that the movable knife rest is driven by two cylinders to do reciprocating motion simultaneously, the thread cutting mechanism of the sewing machine enables the two ends of the movable knife rest to be stressed and the two ends of the movable knife rest to move relative to the machine base at the same speed all the time through the matched structure of the linkage assembly and the sliding rail sliding block, in addition, compared with the traditional mode that the sliding rail is kept motionless and the sliding block moves, the sliding block of the thread cutting mechanism of the sewing machine is kept motionless all the time in the use process, the linkage assembly drives the two sliding rails to synchronously move relative to the sliding, so that the possibility that the sliding block is damaged is greatly reduced, the sliding rail is far higher than the bearing capacity of the sliding block, the service life and the service stability of the thread cutting mechanism of the sewing machine can be prolonged, the sliding rail is long-shaped, the movable knife rest and the linkage assembly can be connected better, the running stability and the moving precision of the movable knife rest can be guaranteed, and the stability and the thread cutting effect of the thread cutting mechanism are improved.

In the thread cutting mechanism of the sewing machine, the linkage assembly comprises a fixing frame, a pair of rotating shafts are rotatably arranged on the fixing frame, the two rotating shafts are respectively connected with corresponding sliding rails in a hinged mode through first connecting blocks, driving blocks are fixedly connected in the rotating shafts, the two driving blocks are connected through linkage pull rods, and the two driving blocks are respectively connected with the linkage pull rods in a hinged mode. When the sliding rail synchronous motion device is used, one of the driving blocks is pulled by external force, and the two driving blocks synchronously move due to the action of the linkage pull rod, so that synchronous rotation of the two rotating shafts is realized, the two rotating shafts drive the corresponding sliding rails to move through the first connecting blocks, synchronous movement of the two sliding rails is realized, and the linkage assembly with the structure is simple in structure and can realize synchronous movement of the two sliding rails. In addition, the linkage assembly can also adopt a ball screw structure except that the structure is adopted, and specifically, the ball screw structure comprises a screw rod and a screw rod nut, wherein the screw rod is arranged between two sliding rails and along the length direction of the sliding rails, and two sides of the screw rod nut are respectively connected with the two sliding rails.

In the thread cutting mechanism of the sewing machine, the linkage assembly is connected with the driving connecting rod, and the driving connecting rod is connected with one of the driving blocks. When the device is used, the driving connecting rod is used for connecting a power source, the power source pulls the driving blocks connected with the driving connecting rod through the driving connecting rod, and the two driving blocks synchronously move due to the action of the linkage pull rod, so that synchronous rotation of two rotating shafts is realized, the two rotating shafts drive corresponding sliding rails to move through the first connecting blocks, synchronous movement of the two sliding rails is realized, and the linkage assembly can realize synchronous movement of the two sliding rails better.

In the thread cutting mechanism of the sewing machine, the end part of the sliding rail, which is far away from the movable knife rest, is fixedly connected with the second connecting block, and the second connecting block is hinged with the first connecting block. The second connecting block on the one hand makes the slide rail can be connected with first connecting block is articulated better to make first connecting block drive the slide rail better and remove, on the other hand the second connecting block links firmly the tip at the slide rail, in the slip in-process, when second connecting block and slider looks butt, the slider can play the effect of blockking to the slide rail removal, thereby plays the limiting displacement that moves the knife rest to keeping away from the linkage subassembly direction.

In the thread cutting mechanism of the sewing machine, at least two parts of the rotating shaft along the axial direction are respectively connected with the fixing frame in a rotating way through the shaft sleeve. The rotating shaft is connected with the fixing frame in a rotating way through the shaft sleeve at least at two positions along the axial direction, so that the rotating stability and the rotating accuracy of the rotating shaft can be guaranteed, and the linkage assembly can better realize synchronous movement of the two sliding rails.

In the thread cutting mechanism of the sewing machine, the machine base is provided with the sliding groove, the movable knife rest is arranged in the sliding groove in a sliding manner, and the movable knife rest is positioned between the machine base and the sliding rail. The movable tool rest is arranged in the sliding groove in a sliding manner, the movable tool rest is arranged between the machine base and the sliding rail, the running stability and the moving precision of the movable tool rest can be further guaranteed, the stability of the wire cutting mechanism and the wire cutting effect are further improved, in addition, in the sliding process, when the movable tool rest is abutted with the sliding block, the sliding block can play a role in blocking the movement of the movable tool rest, and therefore the limiting effect that the movable tool rest moves towards the direction close to the linkage assembly is achieved.

Compared with the prior art, the thread cutting mechanism of the sewing machine has the advantages that: the thread cutting mechanism of the sewing machine is characterized in that the two ends of the movable cutter frame are stressed in balance and move at the same speed all the time through the matched structure of the linkage assembly and the sliding rail sliding block, so that the running stability and the moving precision of the movable cutter frame can be ensured, and the stability and the thread cutting effect of the thread cutting mechanism are improved.

Drawings

Fig. 1 is a schematic perspective view of a thread cutting mechanism of the sewing machine.

Fig. 2 is an exploded view of the thread cutting mechanism of the sewing machine.

Fig. 3 is a sectional view of a thread cutting mechanism of the sewing machine.

Fig. 4 is a schematic view showing a bottom perspective of a thread cutting mechanism of the sewing machine.

Fig. 5 is a schematic view showing a bottom perspective of a base of a thread cutting mechanism of the sewing machine.

Fig. 6 is a schematic perspective view of the thread cutting mechanism of the sewing machine in use.

In the figure, 1, a stand; 1a, a chute; 2. a movable tool rest; 3. a slide rail; 4. a slide block; 5. a linkage assembly; 5a, fixing frame; 5b, a rotating shaft; 5c, a first connecting block; 5d, a driving block; 5e, linkage pull rod; 6. a drive link; 7. a second connection block; 8. a shaft sleeve.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

Example 1

The utility model provides a thread cutting mechanism of sewing machine, refers to fig. 1-6, includes frame 1 and movable knife rest 2 that movably sets up on frame 1, slide rail 3 has been linked firmly respectively to movable knife rest 2's both ends, slide block 4 has been linked firmly respectively to the position of corresponding two slide rails 3 on the frame 1, slide rail 3 slidable is connected on slide block 4, and this thread cutting mechanism still includes the linkage subassembly 5 that can drive two slide rails 3 synchronous motion.

Specifically, referring to fig. 1, 2 and 3, the linkage assembly 5 includes a fixing frame 5a, a pair of rotating shafts 5b are rotatably disposed on the fixing frame 5a, the two rotating shafts 5b are respectively hinged with the corresponding sliding rails 3 through first connecting blocks 5c, driving blocks 5d are fixedly connected on the rotating shafts 5b, the two driving blocks 5d are connected through a linkage pull rod 5e, and the two driving blocks 5d are respectively hinged with the linkage pull rod 5 e. Further, referring to fig. 1, 2 and 3, the linkage assembly 5 is connected with a driving link 6, and the driving link 6 is connected with one of the driving blocks 5 d. Further, referring to fig. 1, 2 and 3, the end of the sliding rail 3 away from the moving blade carrier 2 is fixedly connected with a second connecting block 7, and the second connecting block 7 is hinged with the first connecting block 5 c. Still further, referring to fig. 4 and 5, the base 1 is provided with a sliding groove 1a, the movable tool rest 2 is slidably disposed in the sliding groove 1a, and the movable tool rest 2 is located between the base 1 and the sliding rail 3. In this embodiment, the rotating shaft 5b is preferably rotatably connected to the fixing frame 5a through the shaft sleeve 8 at least at two positions along the axial direction.

When the wire shearing mechanism is used, referring to fig. 1-6, the driving connecting rod 6 is used for connecting a power source, the power source pulls the driving blocks 5d connected with the driving connecting rod 6 through the driving connecting rod, because the linkage pull rod 5e connects the two driving blocks 5d, the two driving blocks 5d can synchronously rotate under the pulling of the driving connecting rod 6, and because the driving blocks 5d are fixedly connected with the rotating shaft 5b, the rotating shaft 5b can rotate along with the fixedly connected driving blocks 5d, namely, the synchronous rotation of the two rotating shafts 5b is realized, then the two rotating shafts 5b drive the sliding rail 3 which is hinged with the driving connecting rod through the first connecting block 5c to move respectively, so that the synchronous movement of the two sliding rails is realized, the sliding rail 3 can only do linear movement under the limiting action of the sliding block 2, so that the stress at two ends of the moving tool rest 2 is balanced, and the two ends of the moving tool rest 2 always move relative to the machine base 1 at the same speed, the running stability and the moving precision of the moving tool rest 2 can be ensured, and the stability and the wire shearing effect of the wire shearing mechanism are further improved.

Example two

The present embodiment is basically the same in structure and principle as the first embodiment, except that: the linkage assembly 5 is a ball screw structure (not shown in the figure), the ball screw structure comprises a screw rod and a screw nut, the screw rod is arranged between the two sliding rails 3 and along the length direction of the sliding rails 3, and two sides of the screw nut are respectively connected with the two sliding rails 3.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims (6)

1. The utility model provides a sewing machine's thread cutting mechanism, includes frame (1) and movable knife rest (2) of movably setting on frame (1), its characterized in that, slide rail (3) have been linked firmly respectively to the both ends of movable knife rest (2), slide block (4) have been linked firmly respectively to the position of corresponding two slide rails (3) on frame (1), slide rail (3) slidable ground is connected on slide block (4), this thread cutting mechanism still includes link assembly (5) that can drive two slide rails (3) synchronous motion.

2. The thread cutting mechanism of a sewing machine according to claim 1, wherein the linkage assembly (5) comprises a fixing frame (5 a), a pair of rotating shafts (5 b) are rotatably arranged on the fixing frame (5 a), the two rotating shafts (5 b) are respectively hinged with corresponding sliding rails (3) through first connecting blocks (5 c), driving blocks (5 d) are fixedly connected on the rotating shafts (5 b), the two driving blocks (5 d) are connected through linkage pull rods (5 e), and the two driving blocks (5 d) are respectively hinged with the linkage pull rods (5 e).

3. A thread cutting mechanism of a sewing machine according to claim 2, wherein the linkage assembly (5) is connected with a drive link (6), and the drive link (6) is connected with one of the drive blocks (5 d).

4. The thread cutting mechanism of a sewing machine according to claim 2, wherein the end of the sliding rail (3) far away from the movable knife rest (2) is fixedly connected with a second connecting block (7), and the second connecting block (7) is hinged with the first connecting block (5 c).

5. A thread cutting mechanism for a sewing machine according to claim 2, wherein the shaft (5 b) is rotatably connected to the fixed frame (5 a) via a bush (8) at least at two positions along the axial direction.

6. A thread cutting mechanism for a sewing machine according to any one of claims 1-5, wherein the frame (1) is provided with a chute (1 a), the movable blade carrier (2) is slidably disposed in the chute (1 a), and the movable blade carrier (2) is disposed between the frame (1) and the slide rail (3).