A sewing machine

Abstract

The present application proposes a sewing machine, which specifically relates to the technical field of sewing machine manufacturing. It includes a driving source, and the driving source executes a reverse stitch length adjustment mechanism, a presser foot lifting mechanism, and a thread trimming mechanism in different time periods. It is characterized in that a reverse stitch driving wheel and a presser foot thread trimming driving wheel are installed on the main shaft of the driving source, and the reverse stitch driving wheel rotates back and forth within the reverse stitch length adjustment angle of the driving source, and the presser foot thread trimming driving wheel performs presser foot lifting and thread trimming actions at the presser foot thread trimming angle of the driving source. The present application uses one driving source to execute reverse stitch length adjustment, presser foot lifting, and thread trimming actions, so as to achieve the purpose of executing multiple sewing actions using one power source, so that the driving source fully exerts its operating efficiency, realizes programmed control of each sewing action, and has the characteristics of high efficiency.

Description

Technical Field

[0001] The present application provides a sewing machine, and specifically relates to the technical field of sewing machine manufacturing. Background Art

[0002] Sewing machines currently on the market generally use stepper motors to control the swing seat to adjust the stitch length. At the same time, the sewing machine uses a stepper motor or an electromagnet to control the presser foot lifting and thread cutting actions respectively. The configuration of multiple power devices reduces the power utilization rate of the entire sewing machine, making the manufacturing and assembly of the sewing machine complicated, and increasing the cost of the entire sewing machine. The operation of multiple drive sources also increases the heat dissipation of the sewing machine, which shortens the service life of the sewing machine's electronic control in the long run. In response to the above technical defects, a sewing machine that uses a stepper motor to control the stitch length adjustment, presser foot and thread cutting has been developed to improve the overall working efficiency of the machine and reduce manufacturing costs. Summary of the invention

[0003] In view of the above-mentioned defects in the existing sewing machine technology, a sewing machine with high efficiency is provided to perform multiple sewing actions with one power source, including a driving source, the driving source executing a reverse stitching stitch length adjustment mechanism, a presser foot lifting mechanism and a thread trimming mechanism in different time periods, characterized in that a reverse stitching driving wheel and a presser foot thread trimming driving wheel are installed on the main shaft of the driving source, the reverse stitching driving wheel rotates back and forth within the reverse stitch length adjustment angle of the driving source, and the presser foot thread trimming driving wheel performs presser foot lifting action and thread trimming action at the presser foot thread trimming angle of the driving source. Using one driving source to simultaneously drive the reverse stitching driving wheel and the presser foot thread trimming driving wheel makes the design of the sewing machine more reasonable, greatly reduces the manufacturing cost, and greatly improves the mechanical transmission efficiency.

[0004] Preferably, the return stitch length adjustment angle does not overlap with the presser foot thread trimming angle. The return stitch length adjustment angle does not overlap with the presser foot thread trimming angle, which ensures that the various actions driven by the driving source do not interfere with each other, thereby achieving orderly execution of various sewing actions and facilitating control by the sewing machine program.

[0005] Preferably, the reverse seam driving wheel has an action wheel at an eccentric position, the action wheel abuts against the reverse seam action surface of the reverse seam driving wheel, and the reverse seam driving wheel is hingedly connected to the swing seat.

[0006] Preferably, an upper connecting rod is arranged between the swing seat and the return seam swing fork wheel, a hinged arrangement is arranged between the connecting rod and the return seam swing fork wheel, and a hinged arrangement is arranged between the connecting rod and the swing seat.

[0007] Preferably, the reverse seam swing fork wheel also has a swing sleeve, which is the swing fulcrum of the reverse seam swing fork wheel. The swing sleeve is movably connected to a fixed shaft, and the fixed shaft is fixed on the sewing machine.

[0008] Preferably, the reverse seam swing fork wheel has a presser foot shearing action surface and a reverse seam action surface, and the reverse seam driving wheel has an action wheel, and when the action wheel idles between the idling surface 1 and the idling surface 2 inside the reverse seam swing fork wheel, the presser foot thread trimming driving wheel performs the presser foot lifting action and the thread trimming action at the presser foot lifting and thread trimming turning angle of the driving source. The idling setting ensures that there is no influence between the various sewing actions.

[0009] Preferably, the reverse sewing driving wheel directly acts on the thread trimming cam and the presser foot cam under the drive of the driving source.

[0010] Preferably, the presser foot thread trimming active wheel presses the presser foot thread trimming crank to rotate the presser foot thread trimming shaft, and the thread trimming cam and the presser foot lifting cam fixedly installed on the other side of the presser foot thread trimming shaft also twist accordingly, and the twisted thread trimming cam and presser foot cam apply thrust to the presser foot lifting connecting rod and the thread trimming connecting rod respectively, and the above-mentioned presser foot lifting connecting rod and the thread trimming connecting rod push the presser foot lifting end to execute and the thread trimming end to execute.

[0011] Preferably, the main shaft is only equipped with a reverse seam swing fork wheel, and the driving source drives the reverse seam swing fork wheel to perform the reverse seam stitch length adjustment action.

[0012] Preferably, the thread trimming cam and the presser foot cam are fixed to the presser foot thread trimming rotating shaft, or the thread trimming cam is installed on the presser foot thread trimming rotating shaft, or the presser foot lifting cam is installed on the presser foot thread trimming rotating shaft.

[0013] Compared with the prior art, the beneficial effects of the present application are as follows: the present application uses one driving source to perform the back stitching adjustment, presser foot lifting action and thread trimming action, so as to achieve the use of one power source to perform multiple sewing actions, so that the driving source can give full play to its operating efficiency, realize the programmed control of each sewing action, and has the characteristics of high efficiency. In terms of manufacturing, the assembly efficiency is improved. Since only one power source is used, the failure rate of the driving source of the whole machine is relatively reduced, thereby improving the performance of the whole sewing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of a sewing machine of the present application;

[0015] Figure 2 It is a schematic diagram of a back-stitching stitch length adjustment mechanism, a presser foot lifting mechanism and a thread trimming mechanism of a sewing machine of the present application;

[0016] Figure 3 It is a schematic diagram of a back-stitch stitch length adjustment mechanism of a sewing machine of the present application;

[0017] Figure 4 It is a schematic structural diagram of a presser foot lifting mechanism and a thread trimming mechanism of a sewing machine of the present application.

[0018] The accompanying drawings are marked as follows: driving source 10, main shaft 11, reverse seam active wheel 21, action wheel 211, reverse seam swing fork wheel 22, idling surface one 221, idling surface two 222, swinging sleeve 223, reverse seam rotating surface 224, swinging seat 23, feeding shaft 24, connecting rod 25, fixed shaft 26, presser foot thread trimming active wheel 30, presser foot thread trimming crank 31, presser foot thread trimming rotating shaft 32, presser foot lifting connecting rod 33, presser foot lifting cam 34, presser foot lifting end actuator 35, thread trimming connecting rod 36, thread trimming cam 37, thread trimming end actuator 38, elastic member 4. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present application are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application. These implementation modes are only used to illustrate the present invention, and are not intended to limit the present invention. Example

[0020] In the accompanying drawings, a sewing machine of the present application has a driving source 10, a back-stitching stitch length adjustment mechanism, a presser foot lifting mechanism and a thread trimming mechanism. The driving source 10 performs back-stitching stitch length adjustment, presser foot lifting and thread trimming actions in different time periods. The main shaft 11 of the driving source 10 is controlled by the sewing machine to sequentially perform the back-stitching stitch length adjustment action of the back-stitching stitch length adjustment mechanism, the thread trimming action of the thread trimming mechanism and the presser foot lifting action of the presser foot lifting mechanism. The driving source 10 adopts a shaft rotation power device, and this embodiment particularly selects a motor as the driving source.

[0021] The present application adopts a driving source 10 to control the back-stitch stitch adjustment action, presser foot lifting action and thread trimming action in different time periods, which fully reflects that the sewing machine of the present application has a high transmission efficiency, and the manufacturing cost of the sewing machine is greatly reduced compared with the prior art, and the sewing machine has a high power utilization efficiency. The back-stitch driving wheel 21 and the presser foot thread trimming driving wheel 30 are installed on the main shaft 11 of the above-mentioned driving source 10. As another embodiment, the back-stitch driving wheel 21 and the presser foot thread trimming driving wheel 30 can also be installed at both ends of the main shaft 11 of the driving source 10, and the technical effect is the same.

[0022] The reverse stitch length adjustment mechanism includes a driving source 10, a reverse stitch driving wheel 21, a reverse stitch swing fork wheel 22, a swing seat 23, a feed shaft 24, a connecting rod 25 and a fixed shaft 26. The reverse stitch swing fork wheel 22 has a swing sleeve 223, an idle surface 1 221 and an idle surface 222. The driving source 10 first drives the reverse stitch driving wheel 21 to perform the reverse stitch length adjustment action. The driving source 10 rotates back and forth within the reverse stitch length adjustment angle of the sewing machine, so that the reverse stitch driving wheel 21 generates a swing source for the reverse stitch swing fork wheel 22 until the swing seat 23, thereby realizing the reverse stitch length adjustment action. When the back-stitch stitch length adjustment action is implemented, the driving source 10 drives the back-stitch driving wheel 21 and the presser foot thread trimming driving wheel 30 at the same time. The driving source 10 drives the back-stitch driving wheel 21 to make the back-stitch swing fork wheel 22 generate a swing source, while the swing source received by the presser foot thread trimming driving wheel 30 does not have a substantial effect on the presser foot lifting cam 34 and the thread trimming cam 37 to perform the presser foot and thread trimming actions. In other words, the presser foot cam 34 and the thread trimming cam 37 are idle stroke swings under the back-and-forth rotation of the driving source 10, so when the spindle 11 implements the back-stitch stitch length adjustment action, the presser foot lifting mechanism and the thread trimming mechanism do not perform actual actions.

[0023] The specific working process of the reverse stitch length adjustment mechanism is described below. The reverse stitch swing fork wheel 22 has an idle surface 1 221 and an idle surface 222, and the reverse stitch driving wheel 21 has an action wheel 211. The driving source 10 drives the reverse stitch driving wheel 21, and the action wheel 211 abuts against the reverse stitch rotating surface 224 to form a swing source, and the reverse stitch swing fork wheel 22 swings left and right at the original position of the action wheel 211. The reverse stitch swing fork wheel 22 is hinged with the swing seat 23, and the reverse stitch swing fork wheel 22 swinging left and right transmits the swing source to the swing seat 23, and then the swing seat 23 transmits the swing source to the feed shaft 24 to implement the reverse stitch length adjustment. The above-mentioned reverse stitch swing fork wheel 22 also has a swing sleeve 223, which is the swing fulcrum of the reverse stitch swing fork wheel 22, and the swing sleeve 223 is dynamically connected to the fixed shaft 26, and the fixed shaft 26 is fixed on the sewing machine.

[0024] In this embodiment, a connecting component is further added between the back seam swing fork wheel 22 and the swing seat 23, that is, a connecting rod 25 is provided between the swing seat 23 and the back seam swing fork wheel 22. The connecting rod 25 and the back seam swing fork wheel 22 are hingedly arranged, and the connecting rod 25 and the swing seat 23 are hingedly arranged.

[0025] After the driving source 10 implements the back-stitching stitch length adjustment action in the back-stitching stitch length adjustment angle, the driving source 10 enters the presser foot lifting and thread trimming angle to perform the presser foot lifting and thread trimming actions. The presser foot thread trimming active wheel 30 directly acts on the thread trimming cam 37 and the presser foot cam 34 under the drive of the driving source 10, thereby realizing the presser foot lifting and thread trimming actions. Another scheme of this embodiment is to implement the presser foot lifting and thread trimming actions by providing a presser foot thread trimming rotating shaft 32. Before entering the presser foot thread trimming angle, the driving source 10 drives the back-stitching swing fork wheel 22 to swing, and also drives the presser foot thread trimming active wheel 30 to rotate. The swing source transmitted to each part of the presser foot lifting mechanism and the thread trimming mechanism is not enough to generate substantial thrust on the thread trimming cam 37 and the presser foot cam 34, which is actually insufficient thrust. The reason is that the action wheel 211 at the eccentric position of the back-stitching active wheel 21 is at a position with the main shaft 11 as the center of the circle when the driving source 10 enters. As a result, when the driving source 10 drives the presser foot thread trimming active wheel 30 to rotate, the action wheel 211 idles between the idle surface 1 221 and the idle surface 222 inside the reverse stitch swing fork wheel 22. Therefore, the reverse stitch length adjustment will not affect the presser foot lifting action and the thread trimming action, and the reverse stitch length adjustment angle does not overlap with the presser foot lifting and thread trimming angle. Similarly, the reverse stitch length adjustment during the presser foot lifting action and the thread trimming action is not affected at all.

[0026] When the driving source 10 starts to swing the presser foot thread trimming driving wheel 30 at the reverse stitch pitch adjustment angle, the presser foot thread trimming driving wheel 30 presses the presser foot thread trimming crank 31 to rotate the presser foot thread trimming rotating shaft 32, and the thread trimming cam 37 and the presser foot lifting cam 34 fixed on the other side of the presser foot thread trimming rotating shaft 32 also twist accordingly, and the twisted thread trimming cam 37 and the presser foot cam 34 respectively apply thrust to the presser foot lifting connecting rod 33 and the thread trimming connecting rod 36, so that the presser foot lifting connecting rod 33 and the thread trimming connecting rod 36 push the presser foot lifting end execution 35 and the thread trimming end execution 38, and implement the presser foot lifting action and the thread trimming action. The presser foot thread trimming rotating shaft 32 is also provided with an elastic member 4, which is used for the reset effect of the presser foot thread trimming rotating shaft 32 after being pressed by the presser foot thread trimming driving wheel 30. Example

[0027] This embodiment is basically the same as the above-mentioned embodiment 1, except that the above-mentioned main shaft 11 is only equipped with a reverse seam swing fork wheel 22, and the driving source 10 drives the reverse seam swing fork wheel 22 to perform the reverse seam stitch length adjustment action. Example

[0028] This embodiment is basically the same as the above-mentioned embodiment 1, except that the above-mentioned presser foot thread trimming shaft 32 is only equipped with a thread trimming cam 37, and the driving source 10 drives the presser foot thread trimming driving wheel 30 and performs the presser foot lifting action through the thread trimming cam 37. Example

[0029] This embodiment is basically the same as the above-mentioned embodiment 1, except that the above-mentioned presser foot thread trimming shaft 32 is only equipped with a presser foot lifting cam 34, and the driving source 10 drives the presser foot thread trimming driving wheel 30 and performs the thread trimming action through the presser foot lifting cam 34.

[0030] The above description is only the preferred implementation mode of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present application. 。

Claims

1. A sewing machine, comprising a driving source (10), a back-stitching stitch length adjustment mechanism, a presser foot lifting mechanism and a thread trimming mechanism, wherein the driving source (10) executes the back-stitching stitch length adjustment mechanism, the presser foot lifting mechanism and the thread trimming mechanism in different time periods, characterized in that: The reverse stitch needle pitch adjustment mechanism comprises a reverse stitch swing fork wheel (22), a swing seat (23), a connecting rod (25) and a reverse stitch driving wheel (21); the reverse stitch driving wheel (21) is mounted on the main shaft (11) of the driving source (10); the reverse stitch driving wheel (21) has an action wheel (211) at an eccentric position; the reverse stitch swing fork wheel (22) has a reverse stitch rotating surface (224); the action wheel (211) abuts against the reverse stitch rotating surface (224); a connecting rod (25) is arranged between the reverse stitch swing fork wheel (22) and the swing seat (23); a hinged arrangement is arranged between the connecting rod (25) and the reverse stitch swing fork wheel (22); a hinged arrangement is arranged between the connecting rod (25) and the swing seat (23); the reverse stitch driving wheel (21) rotates back and forth within the reverse stitch needle pitch adjustment rotation angle of the driving source (10); The presser foot lifting mechanism comprises a presser foot thread trimming driving wheel (30), a presser foot thread trimming crank (31), a presser foot thread trimming rotating shaft (32), a presser foot lifting connecting rod (33), a presser foot lifting cam (34) and a presser foot lifting end actuator (35); the thread trimming mechanism comprises a presser foot thread trimming driving wheel (30), a presser foot thread trimming crank (31), a presser foot thread trimming rotating shaft (32), a thread trimming connecting rod (36), a thread trimming cam (37) and a thread trimming end actuator (38); the driving source (10) comprises a main shaft (11) on which the presser foot thread trimming driving wheel (30) is installed; the presser foot thread trimming main shaft (11) comprises a presser foot thread trimming driving wheel (30) and a presser foot thread trimming connecting rod (33). The moving wheel (30) presses the presser foot thread trimming crank (31) to rotate the presser foot thread trimming rotating shaft (32), and the thread trimming cam (37) and the presser foot lifting cam (34) fixedly installed on the presser foot thread trimming rotating shaft (32) twist accordingly, and the twisted thread trimming cam (37) and the presser foot lifting cam (34) respectively push the thread trimming connecting rod (36) and the presser foot lifting connecting rod (33), so that the presser foot lifting connecting rod (33) and the thread trimming connecting rod (36) respectively push the presser foot lifting end execution (35) and the thread trimming end execution (38), and the presser foot lifting action and the thread trimming action are implemented within the presser foot lifting thread trimming rotating angle; The return seam swing fork wheel (22) further comprises an idle surface one (221) and an idle surface two (222); when the action wheel (211) idles between the idle surface one (221) and the idle surface two (222) inside the return seam swing fork wheel (22), the presser foot thread trimming active wheel (30) performs a presser foot lifting action and a thread trimming action at a presser foot thread trimming lifting angle of the driving source (10).

2. A sewing machine according to claim 1, characterized in that: The back-stitch stitch length adjustment angle does not overlap with the presser foot lifting thread trimming angle, and the action wheel (211) abuts against the back-stitch rotating surface (224) to swing.

3. A sewing machine according to claim 1, characterized in that: The reverse seam swing fork wheel (22) further comprises a swing shaft sleeve (223) and a fixed shaft (26); the swing shaft sleeve (223) is a swing fulcrum of the reverse seam swing fork wheel (22); the swing shaft sleeve (223) and the fixed shaft (26) are movably connected; and the fixed shaft (26) is fixed on the sewing machine.

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