Stitch length adjusting mechanism on sewing machine

Abstract

The utility model relates to a stitch length adjusting mechanism on a sewing machine, which is characterized by comprising a driving part, an eccentric wheel, a crank and a swing rod, the eccentric wheel is arranged on an output shaft of the driving part, one end of the swing rod is connected with the crank, the other end of the swing rod is positioned on a machine needle seat, and the crank is directly or indirectly connected with the eccentric wheel. When the eccentric wheel rotates, the swing rod is driven to swing. By the adoption of the technical scheme, the stitch length adjusting mechanism on the sewing machine is simple in adjusting structure, convenient to operate and capable of being adjusted at any time.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, especially a needle spacing adjusting mechanism on sewing machine. BACKGROUND

[0002] In the prior art, the needle spacing adjusting function of the sewing machine is achieved by manually rotating a hand wheel to drive the needle holder to swing, which cannot be adjusted during the operation of the machine and must be stopped before the needle spacing adjusting operation can be performed, which is not convenient. SUMMARY

[0003] The utility model discloses a needle spacing adjusting mechanism on sewing machine, which is simple in structure, easy to operate and can be adjusted at any time.

[0004] The utility model discloses a needle spacing adjusting mechanism on sewing machine, which comprises a driving member, an eccentric wheel, a crank and a swing rod, the eccentric wheel is arranged on the output shaft of the driving member, one end of the swing rod is connected with the crank, and the other end is located on the needle holder, the crank is directly or indirectly connected with the eccentric wheel to drive the swing rod to swing when the eccentric wheel rotates.

[0005] The above technical solution is convenient to use, easy to adjust, high in functionality, good in stability and capable of meeting different sewing requirements, and solves the problem that the needle spacing adjusting function of the sewing machine is achieved by manually rotating a hand wheel to drive the mechanical structure, which cannot be adjusted during the operation of the machine and must be stopped before the needle spacing adjusting operation can be performed.

[0006] The utility model discloses a further setting, further comprising a connecting rod, the crank is indirectly connected with the eccentric wheel through the connecting rod, and the eccentric wheel can drive the connecting rod to rotate to drive the crank to swing when rotating.

[0007] The further setting is that the connecting rod is provided with a first connecting hole and a second connecting hole, the first connecting hole is sleeved outside the eccentric wheel and is provided with a first bearing between the eccentric wheel, and the second connecting hole is sleeved outside the mounting shaft and is provided with a second bearing between the mounting shaft.

[0008] The above further setting is adopted, the connecting structure is simple and good in stability, and the crank can be driven to swing when the eccentric wheel rotates.

[0009] The further setting of the utility model discloses that the crank comprises a first connecting part and a second connecting part, the first connecting part is provided with a first mounting hole, the end of the swing rod is inserted into the first mounting hole, the second connecting part is provided with a second mounting hole, and the connecting rod is connected into the second mounting hole through the mounting shaft.

[0010] Further setting as above, the second connecting part swings under the driving of the connecting rod, and can drive the first connecting part to move, thereby driving the swing rod to swing.

[0011] Further setting of the utility model: the first connecting part is further provided with a slot communicated with the first mounting hole, and the first connecting part is provided with a locking piece, the clamping force of both sides of the slot is adjusted, so that the first mounting hole tightly holds or releases the swing rod.

[0012] Further setting: the locking piece comprises a locking rod and a nut, the locking rod is arranged in the slot, and the end is threadedly connected with the nut.

[0013] The further setting as above has the advantages of simple structure, convenient disassembly and assembly, and the clamping force of the first mounting hole can be adjusted by rotating the nut, thereby realizing the disassembly and assembly between the swing rod and the crank. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the embodiment of the utility model;

[0015] Figure 2 It is a schematic diagram of the crank and the swing rod of the embodiment of the utility model;

[0016] Figure 3 It is a schematic diagram of the second mounting hole arranged on the crank of the embodiment of the utility model;

[0017] Figure 4 It is a schematic diagram of the arc-shaped slot arranged on the crank of the embodiment of the utility model;

[0018] Figure 5 It is a schematic diagram of the connecting rod of the embodiment of the utility model;

[0019] Figure 6 It is a schematic diagram of the connecting rod and the eccentric wheel of the embodiment of the utility model.

[0020] In the drawing, 1, driving piece; 2, eccentric wheel; 3, crank; 31, first connecting part; 311, first mounting hole; 312, slot; 32, second connecting part; 321, second mounting hole; 322, arc-shaped slot; 4, swing rod; 5, connecting rod; 51, first connecting hole; 511, first bearing; 52, second connecting hole; 521, second bearing; 10, needle holder. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in this embodiment with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] It should be noted that in the description of this utility model, all directional indications (such as up, down, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being described. In the description of this utility model, "several" means at least two, such as two or three, unless otherwise specifically defined.

[0024] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that technical personnel in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0025] like Figures 1-6 As shown, a stitch length adjustment mechanism on a sewing machine includes a driving member 1, an eccentric wheel 2, a crank 3 and a swinging rod 4. The eccentric wheel 2 is arranged on the output shaft of the driving member 1, one end of the swinging rod 4 is connected to the crank 3, and the other end is located on the needle seat 10. The crank 3 is directly or indirectly connected to the eccentric wheel 2 to drive the swinging rod 4 to swing when the eccentric wheel 2 rotates. The end of the swinging rod is inserted into the needle seat. The swinging of the swinging rod can drive the needle seat to swing, and then drive the needle to swing, so as to adjust the stitch length. It is easy to use, easy to adjust, highly functional, can meet the needs of different stitches, has good stability, and solves the current sewing problems. The stitch length adjustment function of the sewing machine is achieved by manually turning the handwheel to drive the mechanical structure. It cannot be adjusted during the operation of the machine and the stitch length adjustment operation can only be performed after the machine stops running. To solve the problem of inconvenience, the driving part 1 adopts a motor setting. The greater the motor rotation angle, the greater the swing amplitude. The stitch length is adjusted according to the motor rotation angle, thereby changing the sewing pattern. This adjustment mechanism allows the sewing machine to freely adjust the stitch length even when it is not running or in operation. The stitch length adjustment has high precision, easy operation, and greatly improved work efficiency, which is conducive to the development of sewing machines in a more convenient and intelligent direction.

[0026] Further comprising connecting rod 5, the crank 3 is indirectly connected with eccentric wheel 2 through connecting rod 5, eccentric wheel 2 rotation can drive connecting rod 5 to rotate to drive the crank 3 swing, further setting, the connecting rod 5 is equipped with first connecting hole 51 and second connecting hole 52, the first connecting hole 51 is set on eccentric wheel 2, and first bearing 511 is arranged between the first connecting hole 51 and eccentric wheel 2, the second connecting hole 52 is set on the mounting shaft, and second bearing 521 is arranged between the second connecting hole 52 and the mounting shaft, the connecting structure is simple, and the stability is good, the eccentric wheel 2 is convenient when driving the crank 3 swing.

[0027] The crank 3 includes first connecting portion 31 and second connecting portion 32, the first connecting portion 31 is equipped with first mounting hole 311, the swing rod 4 end is inserted into the first mounting hole 311, the second connecting portion 32 is equipped with second mounting hole 321, the connecting rod 5 is connected in the second mounting hole 321 through the mounting shaft, of course, arc-shaped slot 322 can be provided on the second connecting portion 32, the connecting rod 5 is connected in the arc-shaped slot 322 through the mounting shaft, and the mounting shaft can slide in the arc-shaped slot 322, the swing rod 4 and the connecting rod 5 are connected, the second connecting portion 32 swings under the driving of the connecting rod 5, can drive the first connecting portion 31 movement, to drive the swing rod 4 swing;The first connecting portion 31 is further equipped with the slot 312 communicated with the first mounting hole 311, the first connecting portion is equipped with locking member, the clamping force of both sides of slot 312 is adjusted, so that the first mounting hole 311 tightly or loosens the swing rod 4;Further setting;The locking member includes locking rod and nut, the locking rod is arranged by bolt, the locking rod is arranged in the slot 312, and the end is threadedly connected with the nut, the structure is simple, and the dismounting is convenient, the clamping force of the first mounting hole 311 can be adjusted by rotating the nut, the swing rod 4 and the crank 3 are disassembled.

Claims

1. A needle length adjustment mechanism on a sewing machine, characterized in that: The invention comprises a driving member (1), an eccentric wheel (2), a crank (3) and a swinging rod (4), wherein the eccentric wheel (2) is arranged on the output shaft of the driving member (1), one end of the swinging rod (4) is connected to the crank (3), and the other end is located on the needle seat (10), and the crank (3) is directly or indirectly connected to the eccentric wheel (2) so as to drive the swinging rod (4) to swing when the eccentric wheel (2) rotates.

2. The stitch length adjustment mechanism for a sewing machine according to claim 1, characterized in that: It also includes a connecting rod (5), and the crank (3) is indirectly connected to the eccentric wheel (2) through the connecting rod (5). The rotation of the eccentric wheel (2) can drive the connecting rod (5) to rotate to drive the crank (3) to swing.

3. The needle length adjustment mechanism for a sewing machine according to claim 2, characterized in that: The crank (3) comprises a first connecting portion (31) and a second connecting portion (32); the first connecting portion (31) is provided with a first mounting hole (311); the end of the swing rod (4) is inserted into the first mounting hole (311); the second connecting portion (32) is provided with a second mounting hole (321); and the connecting rod (5) is connected to the second mounting hole (321) via a mounting shaft.

4. The stitch length adjustment mechanism for a sewing machine according to claim 2, characterized in that: The crank (3) comprises a first connecting portion (31) and a second connecting portion (32); the first connecting portion (31) is provided with a first mounting hole (311); the end of the swing rod (4) is inserted into the first mounting hole (311); the second connecting portion (32) is provided with an arcuate groove (322); the connecting rod (5) is connected to the arcuate groove (322) via a mounting shaft.

5. The stitch length adjustment mechanism for a sewing machine according to claim 2, 3 or 4, characterized in that: The connecting rod (5) is provided with a first connecting hole (51) and a second connecting hole (52). The first connecting hole (51) is sleeved outside the eccentric wheel (2), and a first bearing (511) is provided between the first connecting hole (51) and the eccentric wheel (2). The second connecting hole (52) is sleeved outside the mounting shaft, and a second bearing (521) is provided between the second connecting hole (52) and the mounting shaft.

6. The stitch length adjustment mechanism for a sewing machine according to claim 3 or 4, characterized in that: The first connecting portion (31) is further provided with a slot (312) communicating with the first mounting hole (311). The first connecting portion (31) is provided with a locking member for adjusting the clamping force on both sides of the slot (312) so that the first mounting hole (311) holds or releases the swing rod (4).

7. The stitch length adjustment mechanism for a sewing machine according to claim 6, characterized in that: The locking member comprises a locking rod and a nut. The locking rod is inserted into the slot (312), and the end portion is threadably engaged with the nut.

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