CN215440908U - Thread cutting and stitch length adjusting mechanism of sewing machine and sewing machine - Google Patents

Abstract

The utility model belongs to the technical field of sewing machines, in particular to a thread cutting and stitch length adjusting mechanism of a sewing machine and the sewing machine, which comprises a frame and also comprises: the double-head servo motor is arranged in the rack, and motor shafts are arranged at two ends of the double-head servo motor; the adjusting crank is connected with a motor shaft on one end of the double-head servo motor; the adjusting crank is connected with an adjusting component; the trimming crank is connected with a motor shaft on the other end of the double-head servo motor; the thread cutting crank is connected with a thread cutting assembly; when the double-end servo motor rotates, the adjusting crank and the thread cutting crank are driven to rotate simultaneously. According to the utility model, through the double-head servo motor structure, the single motor drives the thread cutting action and the needle pitch adjusting action to operate simultaneously, so that the structural complexity of the sewing machine is greatly reduced, and more installation spaces of the sewing machine are left in the sewing machine.

Description

Thread cutting and stitch length adjusting mechanism of sewing machine and sewing machine

Technical Field

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

Background

The Chinese patent 201910098276.0 discloses a sewing machine and a device for adjusting the needle pitch by lifting and pressing the thread of the thread, which comprises a power part, a cam, a thread-cutting driving crank connected with a thread-cutting mechanism, a thread-lifting driving crank connected with a thread-lifting mechanism and a needle pitch-adjusting driving crank connected with a needle pitch-adjusting mechanism, wherein the power part is connected with the cam and drives the cam to rotate, the cam is provided with a thread-cutting profile surface, a thread-lifting pressure foot profile surface and a needle pitch-adjusting profile surface, the thread-cutting driving crank is provided with a thread-lifting pressure foot ball matched with the thread-cutting profile surface, the thread-lifting pressure foot driving crank is provided with a pressure foot-lifting pressure foot ball matched with the thread-lifting pressure foot profile surface, and the needle pitch-adjusting driving crank is provided with a needle pitch-adjusting roller matched with the needle pitch-adjusting profile surface.

This patent suffers from the following drawbacks: drive the trimming work through trimming drive shaft, trimming drive crank in this patent, the mechanical structure of this kind of drive mode is complicated, and transmission efficiency is low, and it is big to occupy the sewing machine space.

Disclosure of Invention

The utility model aims to provide a thread cutting and stitch length adjusting mechanism of a sewing machine and the sewing machine, which have simple structure and occupy small space of the sewing machine.

The purpose of the utility model is realized as follows:

the utility model provides a trimming and gauge needle adjustment mechanism of sewing machine, includes the frame, still includes:

the double-head servo motor is arranged in the rack, and motor shafts are arranged at two ends of the double-head servo motor;

the adjusting crank is connected with a motor shaft on one end of the double-head servo motor; the adjusting crank is connected with an adjusting component; and

the trimming crank is connected with a motor shaft on the other end of the double-head servo motor; the thread cutting crank is connected with a thread cutting assembly;

when the double-end servo motor rotates, the adjusting crank and the thread cutting crank are driven to rotate simultaneously.

Furthermore, one end of the adjusting crank is provided with an adjusting roller, the adjusting fork is connected through the adjusting roller and is connected with an adjusting rod, and the adjusting rod is connected with the adjusting assembly.

Furthermore, a trimming roller is arranged at one end of the trimming crank, a trimming cam is connected with the trimming roller, the trimming cam is connected with a trimming rod, and the trimming rod is connected with a trimming assembly;

the trimming cam is provided with an open slot, the open slot is provided with an inner contour surface, and the inner contour surface comprises an arc-shaped working section and a flat non-working section; the thread cutting idler wheel is abutted against the working section of the inner contour surface.

Furthermore, the non-working section is provided with a plane convex part protruding inwards.

Further, the adjusting component is a needle pitch adjusting swing seat.

Furthermore, the thread trimming assembly comprises a driving handle of which the middle end is connected with the thread trimming rod, and both ends of the driving handle are provided with a first connecting rod and a second connecting rod which are connected with each other; the cutting device also comprises a first tool rest and a second tool rest which are attached to each other, wherein the first tool rest and the second tool rest are respectively provided with a movable cutter and a fixed cutter; the first connecting rod and the second connecting rod are respectively connected with the first tool rest and the second tool rest.

A sewing machine comprises the thread cutting and stitch length adjusting mechanism of the sewing machine.

Compared with the prior art, the utility model has the outstanding and beneficial technical effects that:

according to the utility model, through the double-head servo motor structure, the single motor drives the thread cutting action and the needle pitch adjusting action to operate simultaneously, so that the structural complexity of the sewing machine is greatly reduced, and more installation spaces of the sewing machine are left in the sewing machine.

An open slot is arranged in the trimming cam, and an arc-shaped working section is arranged in the open slot; the arc-shaped working section is used for being attached to a rotating trimming crank, so that the trimming cam is driven to rotate to work through trimming driving, and meanwhile, the closed open slot is beneficial to the connection stability of the trimming roller and the cam, so that the accurate operation of trimming work is ensured.

Drawings

Fig. 1 is a schematic structural view of a rack.

Fig. 2 is a schematic view of the inside of the sewing machine.

Fig. 3 is a schematic structural diagram of the thread trimming mechanism.

Fig. 4 is a schematic structural view of the pitch adjustment mechanism.

Fig. 5 is a schematic structural view of the trimming cam.

The reference numerals in the figures denote the meanings:

1. a frame; 2. a double-headed servo motor; 21a, a motor shaft; 21b, a motor shaft; 22. a support; 31. adjusting a crank; 32. an adjustment assembly; 33. adjusting the roller; 34. an adjusting fork; 35. adjusting a rod; 36. erecting a rod; 41. a thread cutting crank; 42. a thread trimming assembly; 421. a drive handle; 422. a first link; 423. a second link; 424. a first tool holder; 425. a second tool holder; 426. moving a knife; 427. fixing a cutter; 43. trimming rollers; 44. a trimming cam; 441. an open slot; 442. a working section; 443. a non-working section; 444. a planar convex portion; 45. a thread cutting rod.

Detailed Description

The utility model is further described below with reference to specific examples:

the utility model provides a sewing machine, includes a sewing machine's trimming and gauge needle adjustment mechanism, this sewing machine's trimming and gauge needle adjustment mechanism includes frame 1, still includes:

the double-head servo motor 2 is arranged in the rack, and motor shafts 21 are arranged at two ends of the double-head servo motor 2; when the double-head servo motor 2 works, the motor shafts 21 on the two sides are driven to synchronously rotate.

The adjusting crank 31 is connected with a motor shaft 21 on one end of the double-head servo motor 2; the adjusting crank 31 is connected with an adjusting component 32; and

the trimming crank 41 is connected with the motor shaft 21 on the other end of the double-head servo motor 2; the thread cutting crank 41 is connected with a thread cutting assembly 42; when the double-head servo motor 2 rotates, the adjusting crank 31 and the trimming crank 41 are driven to rotate at the same time.

As shown in fig. 1 and 2, the double-headed servo motor 2 is located at the bottom of the rack 1, and two ends of the double-headed servo motor 2 are respectively provided with a bracket 22 for fixing the double-headed servo motor at the bottom of the rack 1.

As shown in fig. 4, one end of the adjusting crank 31 is fixed on the motor shaft 21 at one end of the double-headed servo motor 2 through a screw, and the other end of the adjusting crank 31 is provided with an adjusting roller 33; the adjusting roller 33 specifically comprises a fixed part fixed on the adjusting crank 31 and a rectangular roller part rotatably arranged on the fixed part, a stitch length adjusting fork 34 is connected through the roller part, one end of the adjusting fork 34 is connected with a transverse adjusting rod 35, and the other end of the adjusting rod 35 is connected with an adjusting component 32; the adjusting component 32 is specifically a needle pitch adjusting swing seat, the needle pitch adjusting swing seat comprises a front swing seat, a rear swing seat, a first connecting handle group and a second connecting handle group, the first connecting handle group is rotatably connected with the front swing seat and the rear swing seat, the second connecting handle group is connected with a vertical rod 36, and the vertical rod is used for connecting a main shaft. During operation, double-end servo motor 2 rotates, drives adjust crank 31 and rotate, adjusts crank 31 and rotates the drive adjust the swing of fork 34, adjust the swing drive of fork 34 the work of needle pitch regulation swing pendulum seat realizes the needle pitch regulation.

As shown in fig. 3, one end of the trimming crank 41 is fixed on the motor shaft 21 at one end of the double-head servo motor 2 through a hoop structure, and the other end of the trimming crank 41 is rotatably provided with a trimming roller 43; the thread trimming roller 43 specifically comprises a roller frame fixed on the thread trimming crank 41 and a roller arranged in the roller frame, and the roller has a smooth arc surface; the thread trimming roller 43 is connected with a thread trimming cam 44, the thread trimming cam 44 is connected with a thread trimming rod 45, and the thread trimming rod 45 is connected with the thread trimming assembly 42. During operation, double-end servo motor 2 rotates and drives trimming crank 41 rotates, and trimming gyro wheel 43 butt of trimming crank 41 is in on the cam, and drives the cam rotates, drives trimming pole 45 work, realizes the trimming.

Furthermore, the trimming cam 44 is provided with an open slot 441, the open slot 441 has an inner contour surface, and the inner contour surface includes an arc-shaped working section 442 and a flat non-working section 443; the trimming roller 43 abuts against the working section 442 of the inner contour. As shown in fig. 3 and 5, the open slot 441 is flat and approximately elliptical, the upper end of the open slot 441 is provided with the arc-shaped working section 442, the lower end of the open slot 441 is provided with a flat non-working section 443, and the thread trimming roller 43 does not abut against the non-working section 443 generally; the arc-shaped working section 442 is used for being attached to and matched with the rotating trimming crank 41, so that the trimming cam 44 is driven to rotate to work through trimming driving, and meanwhile, the closed opening groove 441 is beneficial to the connection stability of the trimming roller 43 and the trimming cam 44, so that the accurate operation of trimming work is ensured.

It should be noted that, in the sewing machine, the thread cutting action and the needle pitch adjusting action are not performed simultaneously, that is, in the thread cutting process, the main shaft of the sewing machine stops and does not rotate any more, and the needle pitch adjusting action needs to be started before the sewing machine works; therefore, sewing machine in this patent is before the work, and earlier through double-end servo motor 2 with stitch length adjust to assigned position after the work, if need the trimming in the working process, then through the drive of double-end servo motor 2 the action of trimming mechanism, the trimming back that finishes, double-end servo motor 2 resets to after the position department of original good stitch length of adjusting, carries out the sewing machine operation again.

According to the utility model, through the structure of the double-head servo motor 2, the single double-head servo motor 2 drives the thread cutting action and the needle pitch adjusting action at the same time, so that the structural complexity of the sewing machine is greatly reduced, and more installation spaces of the sewing machine can be left in the sewing machine.

Further, as shown in fig. 3, the non-working section 443 is provided with a planar protrusion 444 protruding inward, and the planar protrusion 444 is used for distinguishing the non-working section 443 from the working section 442 and reminding an assembler of the non-working section 443, so as to prevent an assembly angle error or an assembly direction error.

Further, the thread trimming assembly 42 comprises a driving handle 421 with the middle end connected with the thread trimming rod 45, and both ends of the driving handle 421 are provided with a first connecting rod 422 and a second connecting rod 423 which are connected; the cutting device also comprises a first tool rest 424 and a second tool rest 425 which are attached to each other, wherein a movable knife 426 and a fixed knife 427 are respectively arranged on the first tool rest 424 and the second tool rest 425; the first link 422 and the second link 423 are connected to the first tool holder 424 and the second tool holder 425, respectively.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered by the protection scope of the utility model.

Claims (7)

1. The utility model provides a trimming and gauge needle adjustment mechanism of sewing machine, includes frame (1), its characterized in that still includes:

the double-head servo motor (2) is arranged in the rack, and motor shafts (21a, 21b) are arranged at two ends of the double-head servo motor (2);

the adjusting crank (31) is connected with a motor shaft (21) on one end of the double-head servo motor (2); the adjusting crank (31) is connected with an adjusting component (32); and

the trimming crank (41) is connected with a motor shaft (21) on the other end of the double-head servo motor (2); the thread cutting crank (41) is connected with a thread cutting assembly (42);

when the double-end servo motor (2) rotates, the adjusting crank (31) and the thread cutting crank (41) are driven to rotate at the same time.

2. The thread trimming and gauge adjusting mechanism of a sewing machine according to claim 1, wherein: one of adjusting crank (31) is served and is equipped with adjusting roller (33), is connected with through adjusting roller (33) and adjusts fork (34), adjusts fork (34) and is connected with regulation pole (35), adjusts pole (35) and connects adjusting subassembly (32).

3. The thread cutting and gauge adjusting mechanism of a sewing machine according to claim 1 or 2, characterized in that: a trimming roller (43) is arranged at one end of the trimming crank (41), a trimming cam (44) is connected through the trimming roller (43), the trimming cam (44) is connected with a trimming rod (45), and the trimming rod (45) is connected with a trimming assembly (42);

the trimming cam (44) is provided with an open slot (441), the open slot (441) is provided with an inner contour surface, and the inner contour surface comprises an arc-shaped working section (442) and a flat non-working section (443); the thread trimming roller (43) abuts against the working section (442) of the inner contour surface.

4. The thread trimming and gauge adjusting mechanism of a sewing machine according to claim 3, wherein: the non-working section (443) is provided with a plane convex part (444) which is convex inwards.

5. The thread cutting and gauge adjusting mechanism of a sewing machine according to claim 1 or 2, characterized in that: the adjusting component (32) is a needle pitch adjusting swing seat.

6. The thread trimming and gauge adjusting mechanism of a sewing machine according to claim 3, wherein: the wire cutting assembly (42) comprises a driving handle (421) of which the middle end is connected with the wire cutting rod (45), and two ends of the driving handle (421) are respectively connected with a first connecting rod (422) and a second connecting rod (423); the cutting device also comprises a first tool rest (424) and a second tool rest (425) which are attached to each other, wherein a movable knife (426) and a fixed knife (427) are respectively arranged on the first tool rest (424) and the second tool rest (425); the first connecting rod (422) and the second connecting rod (423) are respectively connected with the first tool rest (424) and the second tool rest (425).

7. A sewing machine comprising the thread cutting and stitch length adjusting mechanism of the sewing machine according to any one of claims 1 to 6.

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