A jumper device on a sewing machine

Abstract

The utility model discloses a jumper device on sewing machine, including needle rest, and set up in the needle rest's curved needle, be connected with the swing arm mechanism that can drive needle rest and swing forward and backward on the needle rest, be connected with the telescopic mechanism that can drive swing arm mechanism and swing on swing arm mechanism, be equipped with the linkage mechanism that can drive connection of both between telescopic mechanism and swing arm mechanism, the connecting place between linkage mechanism and telescopic mechanism has displacement gap. Through the device in sewing realizes jumper operation, and it will not occupy the operation space of sewing platform surface, will not have the influence to sewing operation, and the user is convenient to use.

Description

Technical Field

[0001] This utility model relates to the technical field of sewing machines, and more particularly to a skipping thread device on a sewing machine. Background Technology

[0002] In garment sewing, it is often necessary to perform skip stitch operations, which temporarily interrupt continuous sewing to meet specific process requirements, such as reserving buttonhole positions or avoiding decorative parts. Patent document CN204608352U discloses a new type of sewing machine. While this machine can perform skip stitch operations, its cylinder is too close to the sewing table, thus occupying a certain amount of operating space and hindering the user's sewing operation. Furthermore, its V-shaped movable rod intersects with the sewing thread, potentially preventing the thread from being threaded smoothly. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a skipping thread device for use on a sewing machine that facilitates sewing for the user.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0005] A skipping device for a sewing machine includes a needle holder and a curved needle mounted on the needle holder. A swing arm mechanism is connected to the needle holder, which can drive the needle holder to swing back and forth. A telescopic mechanism is connected to the swing arm mechanism, which can drive the swing arm mechanism to swing. A linkage mechanism is provided between the telescopic mechanism and the swing arm mechanism to drive the two to rotate. The connection between the linkage mechanism and the telescopic mechanism has a displacement gap.

[0006] In a preferred embodiment of this utility model, the telescopic mechanism includes a guide seat disposed on the sewing machine body, a telescopic rod disposed in the guide seat and movable back and forth, and a telescopic motor disposed on the sewing machine body and capable of driving the telescopic rod to move back and forth. The extended end of the telescopic rod is provided with a first connector that is connected to the linkage mechanism.

[0007] In a preferred embodiment of this utility model, the guide seat includes a first guide seat disposed on the front side and a second guide seat disposed on the rear side; a limiting ring is fixed on the telescopic rod, and the limiting ring is disposed between the first guide seat and the second guide seat; a return spring is sleeved on the telescopic rod, one end of the return spring abuts against the limiting ring, and the other end abuts against the second guide seat.

[0008] In a preferred embodiment of this utility model, a buffer sleeve is fitted onto the telescopic rod, and the buffer sleeve is disposed between the limiting ring and the first guide seat.

[0009] In a preferred embodiment of this utility model, the protruding end of the first connector is annular in shape, and the linkage mechanism includes a hinge seat disposed on the sewing machine body, a first connecting rod hinged to the hinge seat, a rocker arm sleeved on the first connecting rod, a second connector disposed on the protruding end of the first connecting rod, and a second connecting rod disposed at the bottom of the second connector and capable of being inserted downward into the first connector. The insertion end of the second connecting rod protrudes from the first connector, and the outer diameter of the second connecting rod is smaller than the inner diameter of the connector, so that the displacement gap is formed between the two.

[0010] In a preferred embodiment of this utility model, the hinge seat includes a first hinge seat disposed on the right side and a second hinge seat disposed on the left side, the rocker arm is disposed between the first hinge seat and the second hinge seat, and the extended end of the first connecting rod extends to the left through the second hinge seat and connects to the second connector.

[0011] In a preferred embodiment of this utility model, a limiting structure is provided between the rocker arm and the first connecting rod. The limiting structure includes a first limiting groove disposed on the first connecting rod, a second limiting groove disposed on the rocker arm and capable of cooperating with the first limiting groove, and a locking pin disposed between the first limiting groove and the second limiting groove.

[0012] In a preferred embodiment of this utility model, the swing arm mechanism includes a third connector hinged to the extended end of the rocker arm, a third connecting rod disposed on the third connector, and a fourth connector disposed on the other end of the third connecting rod, the fourth connector being disposed on the needle holder.

[0013] In a preferred embodiment of this utility model, the telescopic motor is connected to a pedal switch for controlling its operation.

[0014] The beneficial effects of this utility model are as follows: The skip stitch device includes a needle holder and a curved needle mounted on the needle holder. A swing arm mechanism that can drive the needle holder to swing back and forth is connected to the needle holder, and a telescopic mechanism that can drive the swing arm mechanism to swing is connected to the swing arm mechanism. A linkage mechanism that can transmit power between the telescopic mechanism and the swing arm mechanism is provided, and there is a displacement gap at the connection between the linkage mechanism and the telescopic mechanism. Thus, skip stitch operation can be achieved in sewing with this device, and it does not occupy the operating space of the sewing table, does not affect the sewing operation, and is convenient for the user. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention;

[0016] Figure 2 This is an exploded view of the telescopic mechanism in this utility model;

[0017] Figure 3 This is an exploded view of the linkage mechanism in this utility model;

[0018] Figure 4 This is an exploded view of the swing arm mechanism in this utility model. Detailed Implementation

[0019] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0020] Reference Figures 1 to 4 A skip-stitch device for a sewing machine includes a needle holder 1 and a curved needle 2 mounted on the needle holder 1. A swing arm mechanism 3, capable of driving the needle holder 1 to swing back and forth, is connected to the needle holder 1. A telescopic mechanism 4, capable of driving the swing arm mechanism 3 to swing, is connected to the telescopic mechanism 4. A linkage mechanism 5, connecting the telescopic mechanism 4 and the swing arm mechanism 3, provides a displacement gap at the connection point between the linkage mechanism 5 and the telescopic mechanism 4. The needle holder 1 is fixed to the curved needle 2 drive mechanism at the bottom of the sewing machine, thereby driving the curved needle 2 to swing back and forth and cooperate with the needle above to sew garments. When the user needs to perform a skip-stitch operation while sewing garments, the telescopic mechanism 4 can drive the swing arm mechanism 3 to swing backward, dragging the curved needle 2 backward and causing it to deviate from its normal working position, preventing it from hooking the thread, thus completing the skip-stitch operation to meet specific sewing needs. When normal sewing is required, the telescopic mechanism 4 drives the swing arm mechanism 3 to swing forward, returning it to its normal working position for normal sewing. During this process, the displacement gap eliminates the displacement caused by the movement of the looper 2 driven by the looper 2, thus avoiding interference with the looper 2's thread-hooking operation. The telescopic mechanism 4 and the linkage mechanism 5 are located below the sewing area, so they do not interfere with the thread feeding process. Furthermore, the telescopic mechanism 4 does not occupy the operating space of the sewing table, thus not affecting the user's sewing operation.

[0021] In this solution, the telescopic mechanism 4 includes a guide seat 41 fixed to the sewing machine body by means of a threaded connection, a telescopic rod 42 disposed in the guide seat 41 and movable back and forth, and a telescopic motor 43 fixed to the sewing machine body by means of a threaded connection and capable of driving the telescopic rod 42 to move back and forth. The extended end of the telescopic rod 42 is provided with a first connector 421 connected to the linkage mechanism 5.

[0022] In this design, the guide seat 41 includes a first guide seat 411 disposed on the front side and a second guide seat 412 disposed on the rear side; a limiting ring 422 is fixed on the telescopic rod 42, and the limiting ring 422 is fixed on the telescopic rod 42 by screw locking, and the limiting ring 422 is disposed between the first guide seat 411 and the second guide seat 412; a return spring 423 is sleeved on the telescopic rod 42, one end of the return spring 423 abuts against the limiting ring 422, and the other end abuts against the second guide seat 412, thereby ensuring the accuracy of the position of the bent needle 2 when it is reset.

[0023] In this design, a buffer sleeve 424 is fitted onto the telescopic rod 42. The buffer sleeve 424 is positioned between the limiting ring 422 and the first guide seat 411 to reduce the impact force on the limiting ring 422 and improve its service life.

[0024] In this design, the protruding end of the first connector 421 is annular. The linkage mechanism 5 includes a hinge seat 51 mounted on the sewing machine body, a first connecting rod 52 hinged to the hinge seat 51, a rocker arm 53 sleeved on the first connecting rod 52, a second connector 54 mounted on the protruding end of the first connecting rod 52, and a second connecting rod 55 located at the bottom of the second connecting rod 54 and insertable downward into the first connector 421. The insertion end of the second connecting rod 55 protrudes from the first connector 421, and the outer diameter of the second connecting rod 55 is smaller than the inner diameter of the connector, thus creating the displacement gap between them. The travel distance of the swing arm mechanism 3 driven by the telescopic mechanism 4 to swing back and forth is greater than the travel distance of the looper 2 driven by the looper 2 drive mechanism to swing back and forth. This ensures that the operation of the looper 2 is not affected, and the swing arm mechanism 3 can drive the looper 2 to swing backward, thereby achieving the skip stitch operation.

[0025] In this design, the hinge base 51 includes a first hinge base 511 located on the right side and a second hinge base 512 located on the left side. The rocker arm 53 is positioned between the first hinge base 511 and the second hinge base 512. The extended end of the first connecting rod 52 extends to the left through the second hinge base 512 and connects to the second connector 54. Bearings are provided between the first connecting rod 52 and the first hinge base 511, and between the first connecting rod 52 and the second hinge base 512, allowing the first connecting rod 52 to rotate smoothly within the first hinge base 511 and the second hinge base. Both the first hinge base 511 and the second hinge base 512 are fixed to the sewing machine body via threaded connections.

[0026] In this design, a limiting structure is provided between the rocker arm 53 and the first connecting rod 52. The limiting structure includes a first limiting groove 521 disposed on the first connecting rod 52, a second limiting groove 531 disposed on the rocker arm 53 and capable of cooperating with the first limiting groove 521, and a locking pin 6 disposed between the first limiting groove 521 and the second limiting groove 531, so that the first connecting rod 52 can drive the rocker arm 53 to rotate.

[0027] In this design, the swing arm mechanism 3 includes a third connector 31 hinged to the extended end of the rocker arm 53, a third connecting rod 32 mounted on the third connector 31, and a fourth connector 33 mounted on the other end of the third connecting rod 32. The fourth connector 33 is fixed to the needle holder 1 via a threaded connection. The telescopic mechanism 4 drives the lower end of the first connecting rod 52 to swing backward, causing the rocker arm 53 connected to the upper end of the first connecting rod 52 to swing forward. The swing arm mechanism 3 then drives the needle holder 1 to swing backward, thereby causing the curved needle 2 to swing backward. This multi-link hinge structure allows for flexible force transmission, reducing the impact force from rigid transmission, and adapting to the swing trajectory of the needle holder 1, ensuring the smoothness of the curved needle 2's displacement.

[0028] In this solution, the telescopic motor 43 is connected to a pedal switch for controlling its operation. The pedal switch can be connected to the telescopic motor 43 via wired or wireless means. The pedal switch can be located on the ground or at the bottom of the sewing machine frame, so that the user can control it by stepping on it.

[0029] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A skipping stitch device for a sewing machine, comprising a needle holder (1) and a curved needle (2) disposed on the needle holder (1), wherein a swing arm mechanism (3) is connected to the needle holder (1) and is capable of driving the needle holder (1) to swing back and forth, characterized in that, The swing arm mechanism (3) is connected to a telescopic mechanism (4) that can drive the swing arm mechanism (3) to swing. A linkage mechanism (5) is provided between the telescopic mechanism (4) and the swing arm mechanism (3) to drive the two together. There is a displacement gap at the connection between the linkage mechanism (5) and the telescopic mechanism (4).

2. The skipping stitch device on a sewing machine according to claim 1, characterized in that, The telescopic mechanism (4) includes a guide seat (41) disposed on the sewing machine body, a telescopic rod (42) disposed in the guide seat (41) and movable back and forth, and a telescopic motor (43) disposed on the sewing machine body and capable of driving the telescopic rod (42) to move back and forth. The extended end of the telescopic rod (42) is provided with a first connector (421) connected to the linkage mechanism (5).

3. A skipping stitch device on a sewing machine according to claim 2, characterized in that, The guide seat (41) includes a first guide seat (411) disposed on the front side and a second guide seat (412) disposed on the rear side; a limit ring (422) is fixed on the telescopic rod (42), and the limit ring (422) is disposed between the first guide seat (411) and the second guide seat (412); a return spring (423) is sleeved on the telescopic rod (42), one end of the return spring (423) abuts against the limit ring (422), and the other end abuts against the second guide seat (412).

4. A skipping stitch device on a sewing machine according to claim 3, characterized in that, A buffer sleeve (424) is fitted on the telescopic rod (42), and the buffer sleeve (424) is disposed between the limiting ring (422) and the first guide seat (411).

5. A skipping stitch device on a sewing machine according to any one of claims 2 to 4, characterized in that, The first connector (421) has an annular protrusion. The linkage mechanism (5) includes a hinge seat (51) on the sewing machine body, a first connecting rod (52) hinged to the hinge seat (51), a rocker arm (53) sleeved on the first connecting rod (52), a second connector (54) on the protrusion of the first connecting rod (52), and a second connecting rod (55) at the bottom of the second connecting rod (54) that can be inserted downward into the first connector (421). The insertion end of the second connecting rod (55) protrudes from the first connector (421). The outer diameter of the second connecting rod (55) is smaller than the inner diameter of the connector, so that the displacement gap is formed between them.

6. A skipping stitch device on a sewing machine according to claim 5, characterized in that, The hinge seat (51) includes a first hinge seat (511) disposed on the right side and a second hinge seat (512) disposed on the left side. The rocker arm (53) is disposed between the first hinge seat (511) and the second hinge seat (512). The extended end of the first connecting rod (52) extends to the left through the second hinge seat (512) and connects to the second connector (54).

7. A skipping stitch device on a sewing machine according to claim 5, characterized in that, A limiting structure is provided between the rocker arm (53) and the first connecting rod (52). The limiting structure includes a first limiting groove (521) disposed on the first connecting rod (52), a second limiting groove (531) disposed on the rocker arm (53) and capable of cooperating with the first limiting groove (521), and a locking pin (6) disposed between the first limiting groove (521) and the second limiting groove (531).

8. A skipping stitch device on a sewing machine according to claim 5, characterized in that, The swing arm mechanism (3) includes a third connector (31) hinged to the extended end of the rocker arm (53), a third connecting rod (32) disposed on the third connector (31), and a fourth connector (33) disposed on the other end of the third connecting rod (32). The fourth connector (33) is disposed on the needle holder (1).

9. A skipping stitch device on a sewing machine according to claim 2, characterized in that, The telescopic motor (43) is connected to a pedal switch that controls its operation.

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