Thread trimming mechanism of sewing machine

Abstract

The invention relates to the technical field of sewing machines, in particular to a thread trimming mechanism of a sewing machine. According to the scheme, the drive motor is vertically fixed to the base of the sewing machine, the drive motor drives the drive shaft to be fixedly provided with the thread trimming cam, the thread trimming cam rotates to push the first push rod to rotate, the other end of the rotating first push rod pushes the second push rod, and the second push rod pushes the thread trimming crank; the rotating thread trimming crank pushes the first thread trimming crank to rotate, and the first thread trimming crank is indirectly connected with the thread trimming execution end to execute the thread trimming action of the thread trimming mechanism. Compared with the prior art, the thread trimming driving motor has the advantages that the risk that oil enters an existing thread trimming driving motor can be effectively solved, the service life of the sewing machine driving motor is prolonged, and the thread trimming driving motor has high practicability and popularization and use value.

Description

Technical Field

[0001] The present application relates to the technical field of sewing machines, and specifically proposes a thread trimming mechanism for a sewing machine. Background Art

[0002] National utility model patent CN219793308U discloses a sewing machine, including a driving source. The driving source is used to replace the swing-free seat to not only adjust the needle length of the needle length adjustment mechanism, but also to locate the zero position of the feed dog on the zero position positioning mechanism. It is characterized in that it also has a driving source 2 and a thread trimming and presser foot lifting area. The driving source idles or stays in the thread trimming and presser foot lifting area. At the same time, the driving source 2 actually performs the thread trimming and presser foot lifting actions. This structure is easy to assemble, has a streamlined structure, reduces the manufacturing difficulty and cost, and improves the working efficiency of the sewing machine. The driving source of this solution is installed under the base, and the whole is in the oil pan. When the sewing machine is running, the lubricating oil in the oil pan will splash onto the driving source, and there is a risk of oil intrusion into the driving source. Summary of the invention

[0003] A thread trimming mechanism of a sewing machine, characterized in that a driving motor is fixed in a vertical state on a base of the sewing machine, a thread trimming cam is fixed on a driving shaft of the driving motor, the thread trimming cam rotates to drive a pushing rod 1 to rotate, the other end of the rotating pushing rod 1 drives a pushing rod 2, the pushing rod 2 drives a thread trimming crank, the rotating thread trimming crank drives the thread trimming crank 1 to rotate, and the thread trimming crank 1 is indirectly connected to the thread trimming execution end.

[0004] Furthermore, a motor mounting body and a cover plate are provided on the base, the cover plate covers and is fixed on the motor mounting body, the motor mounting body is used for the driving motor, and the driving motor is fixed inside the motor mounting body in a vertical state.

[0005] Furthermore, the thread trimming cam rotates to push the shaft sleeve 2 provided on the push rod 1, and the push rod 2 is hinged to the pressure plate by screws.

[0006] Furthermore, the push rod 2 has a sliding groove inside, and the screw passes through the sliding groove to movably position the push rod 2 on the pressure plate.

[0007] Furthermore, a shaft sleeve three is fixed to the other end of the push rod two, and the shaft sleeve three is located inside the fork opening one of the fork rod one of the thread trimmer crank. Under the push of the shaft sleeve three, the thread trimmer crank rotates along the rotating shaft.

[0008] Furthermore, the fork opening 2 on the fork rod 2 of the thread trimmer crank is provided with the shaft sleeve 4 on the thread trimmer crank 1 inside.

[0009] Furthermore, the fork rod 1 and fork rod 2 of the thread trimmer crank are connected at an angle staggered, one end of the rotating shaft is clearance-fitted in the shaft hole of the thread trimmer crank, and the other end of the rotating shaft is clearance-fitted on the shaft sleeve 1, and the shaft sleeve 1 is arranged on the machine body through a retaining spring.

[0010] Furthermore, the driving motor has a driving shaft that passes through the bottom of the motor mounting body.

[0011] The solution of the present application fixes a driving motor in a vertical state on the base of the sewing machine, and a thread trimming cam is fixed on the driving shaft driven by the driving motor. The thread trimming cam rotates to drive the push rod 1 to rotate, and the other end of the rotating push rod 1 drives the push rod 2, and the push rod 2 drives the thread trimming crank, and the rotating thread trimming crank drives the thread trimming crank 1 to rotate, and the thread trimming crank 1 is indirectly connected to the thread trimming execution end to execute the thread trimming action of the thread trimming mechanism. Compared with the prior art, the beneficial effect of the present application is that it can effectively solve the risk of oil ingress in the existing thread trimming motor, and improve the service life of the sewing machine drive motor, and has high practicality and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the position of a thread trimming mechanism of a sewing machine on a base of the present application;

[0013] Figure 2 It is a schematic diagram of a drive motor mounting body of a thread trimming mechanism of a sewing machine of the present application;

[0014] Figure 3 This is a schematic diagram of the connection between the drive motor and various components of the thread trimming mechanism of a sewing machine of the present application;

[0015] Figure 4 This is a schematic diagram of the connection of various components of a thread trimming mechanism of a sewing machine of the present application;

[0016] Figure 5 The present invention discloses a schematic diagram of a thread trimming crank, a rotating shaft and a shaft sleeve of a thread trimming mechanism of a sewing machine.

[0017] The specific features indicated by the numbers in the above drawings are as follows: head 10, base 11, motor mounting body 111, cover plate 112;

[0018] Driving motor 20, driving shaft 21;

[0019] Thread trimming cam 31, push rod 1 32, shaft sleeve 2 321, push rod 2 33, slide groove 331, shaft sleeve 3 332, thread trimming crank 34, fork rod 1 341, fork mouth 1 3411, fork rod 2 342, fork mouth 2 3421, rotating shaft 35, shaft sleeve 1 36, thread trimming crank 1 37, shaft sleeve 4 371, thread trimming execution end 38, pressure plate 39. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-5 The preferred embodiments of the present application are described in detail 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 explicit definition of the protection scope of the present application. These embodiments are only used to illustrate the present invention, but not to limit the present invention. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description, and are not used to limit the scope of the present invention. The change or adjustment of their relative relationship shall also be regarded as the scope of the present invention without substantial change in the technical content.

[0021] See the above attachment Figure 1-5 The present application discloses a thread trimming mechanism for a sewing machine for thread trimming of the sewing machine. The sewing machine has a machine head 10 and a thread trimming mechanism, etc. A motor mounting body 111 and a cover plate 112 are provided on the base 11 of the machine head 10. The cover plate 112 covers and is fixed on the motor mounting body 111. The motor mounting body 111 is used to install a driving motor 20 of the thread trimming mechanism. The driving motor 20 is fixed inside the motor mounting body 111 in a vertical state, that is, the driving motor 20 is fixed on the base 11 in a vertical state. Since the vertical state installation can effectively be stained by oil, the problem of the existing motor that performs one-to-two work being installed on the edge of the oil pan being corroded by oil is avoided.

[0022] Driven by the driving motor 20 , the thrust is laterally transmitted to the thread trimming mechanism through the driving shaft 21 , thereby realizing the thread trimming action of the thread trimming mechanism.

[0023] The thread trimming mechanism includes components such as a driving motor 20, a thread trimming cam 31, a push rod 1 32, a push rod 2 33, a thread trimming crank 34, a rotating shaft 35, a sleeve 1 36, a thread trimming crank 1 37, a thread trimming execution end 38 and a pressing plate 39. The driving motor 20 has a driving shaft 21 that passes through the bottom of the motor mounting body 111, and a thread trimming cam 31 is fixed on the driving shaft 21. The thread trimming cam 31 rotates to push the push rod 1 32 to rotate, specifically, the thread trimming cam 31 rotates to push the sleeve 2 321 on the push rod 1 32, specifically, the push rod 2 33 is hinged with a screw and the hinge is roughly located in the middle of the push rod 2 33; the other end of the rotating push rod 1 32 pushes the push rod 2 33; the push rod 2 33 has a slide groove 331 inside, and the screw passes through the slide groove 331 to movably position the push rod 2 33 on the pressing plate 39. The push rod 2 33 pushes the trimming crank 34, specifically, the other end of the push rod 2 33 is fixed with a sleeve 332, the sleeve 332 is located inside the fork 1 3411 of the fork rod 1 341 of the trimming crank 34, and the trimming crank 34 rotates along the rotating shaft 35 under the push of the sleeve 332. The rotating trimming crank 34 pushes the trimming crank 1 37 to rotate, specifically, the fork 2 3421 on the fork rod 2 342 of the trimming crank 34 is provided with a sleeve 4 371 on the trimming crank 1 37, so that the trimming crank 1 37 is pushed to rotate under the rotation of the trimming crank 34. Under the rotation of the trimming crank 1 37, the trimming execution end 38 indirectly connected to the trimming crank 1 37 can implement the trimming action.

[0024] The fork rod 1 341 and the fork rod 2 342 of the above-mentioned thread trimmer crank 34 are connected at staggered angles, one end of the rotating shaft 35 is clearance-fitted in the shaft hole 343 of the thread trimmer crank 34, and the other end of the rotating shaft 35 is clearance-fitted on the shaft sleeve 1 36, and the shaft sleeve 1 36 is arranged on the machine head 10 through a retaining spring. The arrangement of the rotating shaft 35 enables the thread trimmer crank 34 to have a reliable rotating axis.

[0025] The thread trimming cam 31 has a pushing portion 311 , and the driving motor 20 rotates the thread trimming cam 31 so that the pushing portion 311 pushes the rod 1 32 to rotate.

[0026] The above is only one of the preferred implementation methods of the present application and is not intended to limit the present invention. The scope of the patent implementation of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made by using the shape, structure, and principle of the description and drawings of the present application, or directly or indirectly applied in other related technical fields; any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention are included in the patent protection scope of the present application.

Claims

1. A thread trimming mechanism for a sewing machine, characterized in that: The sewing machine has a base on which a driving motor is fixed in a vertical state, and a thread trimming cam is fixed on a driving shaft of the driving motor. The thread trimming cam rotates to drive a pushing rod 1 to rotate, and the other end of the rotating pushing rod 1 drives a pushing rod 2, and the pushing rod 2 drives a thread trimming crank, and the rotating thread trimming crank drives the thread trimming crank 1 to rotate, and the thread trimming crank 1 is indirectly connected to the thread trimming execution end.

2. A thread trimming mechanism for a sewing machine according to claim 1, characterized in that: The base is provided with a motor mounting body and a cover plate, the cover plate covers and is fixed on the motor mounting body, the motor mounting body is used for the driving motor, and the driving motor is fixed inside the motor mounting body in a vertical state.

3. The thread trimming mechanism of a sewing machine according to claim 1, characterized in that: The thread trimming cam rotates to push the shaft sleeve 2 provided on the pushing rod 1, and the pushing rod 2 is hinged to the pressing plate by screws.

4. The thread trimming mechanism of a sewing machine according to claim 1, characterized in that: The push rod 2 has a sliding groove inside, and the screw passes through the sliding groove to movably position the push rod 2 on the pressure plate.

5. The thread trimming mechanism of a sewing machine according to claim 1, characterized in that: The other end of the push rod 2 is fixed with a shaft sleeve 3, which is located inside the fork opening 1 of the fork rod 1 of the thread trimmer crank. Under the push of the shaft sleeve 3, the thread trimmer crank rotates along the rotating shaft.

6. The thread trimming mechanism of a sewing machine according to claim 1, characterized in that: The fork opening 2 on the fork rod 2 of the thread trimmer crank is provided with the shaft sleeve 4 on the thread trimmer crank 1 inside.

7. The thread trimming mechanism of a sewing machine according to claim 1, characterized in that: The fork rod 1 and the fork rod 2 of the thread trimmer crank are connected at staggered angles, one end of the rotating shaft is loosely fitted in the shaft hole of the thread trimmer crank, and the other end of the rotating shaft is loosely fitted on the shaft sleeve 1, which is arranged on the machine body through a retaining spring.

8. The thread trimming mechanism of a sewing machine according to claim 2, characterized in that: The driving motor has a driving shaft that passes through the bottom of the motor mounting body.

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