CN210031103U

CN210031103U - Thread trimming mechanism

Info

Publication number: CN210031103U
Application number: CN201920805784.3U
Authority: CN
Inventors: 黄锦莎; 金涛; 王世来
Original assignee: Donghai Science and Technology Colloge of ZJOU
Current assignee: Donghai Science and Technology Colloge of ZJOU
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-02-07
Anticipated expiration: 2029-05-30

Abstract

The utility model belongs to the technical field of make up equipment, a thread trimming mechanism is related to, its thread trimming inefficiency scheduling problem of having solved current thread trimming mechanism. The thread trimming mechanism comprises a driving source, a rotating shaft, a pressing cap, a pressing rod and a pressing plate, wherein a movable blade and a fixed blade which can be meshed with each other are arranged on the pressing plate, the lower end of the rotating shaft is connected with the movable blade and can drive the movable blade to swing, and the upper end of the rotating shaft sequentially penetrates through the pressing rod and the pressing cap; the wire cutting mechanism further comprises a swing rod, a through hole is formed in one end of the swing rod, a sliding groove is formed in the hole wall of the through hole in the vertical direction, the through hole penetrates through the upper end of the rotating shaft, a boss in sliding fit with the sliding groove is arranged on the side wall of the rotating shaft, and a transmission assembly capable of driving the swing rod to swing is arranged between the driving source and the other end of the swing rod. The utility model has the advantages of the thread trimming is efficient.

Description

Thread trimming mechanism

Technical Field

The utility model belongs to the technical field of make up equipment, a thread trimming mechanism is related to.

Background

After the sewing machine finishes one-time sewing, a section of thread head and overlapped thread feet can be left on the cloth, the thread head and the overlapped thread feet are not easy to trim, the attractiveness of the surface of the clothes is affected, and the efficiency of manually trimming the thread head is lower.

In order to solve the problems, the national patent CN 204251844U discloses a thread trimming mechanism for a presser foot of a sewing machine, which comprises a workbench, a sewing machine head and a presser foot, wherein the presser foot comprises a presser bar and a presser plate, the presser plate is provided with a thread trimming groove parallel to the surface of the workbench, a thread trimming knife is installed in the thread trimming groove, the thread trimming knife comprises a fixed blade and a movable blade, the fixed blade is positioned below the movable blade and fixed in the thread trimming groove, a knife edge is arranged at the position of a sewing stitch corresponding to the front part of the fixed blade, a shaft hole is arranged in the presser bar, a rotating shaft is accommodated in the shaft hole, the rotating shaft upwards extends through a pressing spring above the presser foot and penetrates out of the top of a pressing cap, the upper part of the rotating shaft is movably connected with a transverse connecting rod, the other end of the transverse connecting rod is movably. When the thread cutting device is used, the driving device drives the rotating shaft to rotate through the transverse connecting rod, so that the movable cutter blade is driven to rotate to cut off the thread end.

However, the above scheme cannot be realized in detail by careful analysis, and the specific reasons are as follows:

1. the presser plate of the sewing machine needs to be lifted, so the rotating shaft also needs to be lifted along with the presser plate, and the patent does not provide a scheme how the rotating shaft is lifted;

2. the above patent describes that the output end of the driving device drives the rotating shaft to rotate through the transverse link, but from the analysis of mechanical principle, it can be seen only from the disclosure of the specification and the drawings of the above patent that when the output end of the driving device moves, the transverse link is stuck and cannot swing, and further the rotating shaft does not swing.

Based on the two reasons, the above patent can not realize the thread trimming, and still does not solve the problem of low thread trimming efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having the above-mentioned problem to current technique, provided a thread trimming mechanism, the utility model aims to solve the technical problem that: how to improve the trimming efficiency of the trimming mechanism.

The purpose of the utility model can be realized by the following technical proposal:

a thread trimming mechanism comprises a driving source, a rotating shaft, a pressing cap, a pressing rod and a pressing plate, wherein a movable blade and a fixed blade which can be meshed with each other are arranged on the pressing plate, the lower end of the rotating shaft is connected with the movable blade and can drive the movable blade to swing, and the upper end of the rotating shaft sequentially penetrates through the pressing rod and the pressing cap; the wire cutting mechanism is characterized by further comprising a swing rod, a through hole is formed in one end of the swing rod, a sliding groove is formed in the hole wall of the through hole in the vertical direction, the through hole is penetrated through the upper end of the rotating shaft, a boss in sliding fit with the sliding groove is arranged on the side wall of the rotating shaft, and a transmission assembly capable of driving the swing rod to swing is arranged between the driving source and the other end of the swing rod.

The working principle is as follows: when the thread is required to be cut, the driving source drives the swing rod to swing through the transmission assembly, and the swing rod is matched with the boss on the rotating shaft through the sliding groove in the through hole, so that the rotating shaft can be driven to swing, the movable blade at the lower end of the rotating shaft is driven to swing, and the movable blade is meshed with the fixed blade to cut the thread. When the presser foot needs to be lifted, the pressing plate rises, the rotating shaft can slide along the vertical direction relative to the oscillating bar, and the presser foot is lifted in cooperation with the rising of the pressing plate. Compare with current artifical trimming scheme, the trimming efficiency of this application can obtain great promotion. It should be noted that the pressing plate, the movable blade and the fixed blade mentioned in the present application are the same as those disclosed in the patent CN 204251844U mentioned in the background art, and are not described herein again, and the present application aims to overcome the technical defects existing in the patent CN 204251844U, so as to achieve real intelligent trimming and improve the trimming efficiency.

In the above thread trimming mechanism, there are two of the sliding grooves, and the two sliding grooves are symmetrically distributed about the center line of the through hole; the number of the bosses is two, and the bosses are symmetrically distributed about the center line of the rotating shaft. The sliding groove and the boss are both designed into two parts, so that the stability during transmission can be ensured, and the rapid abrasion caused by the concentrated local stress is avoided.

In the above thread trimming mechanism, as an aspect, the transmission assembly includes a connecting rod, the telescopic shaft of the driving source is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the other end of the swing rod. The telescopic shaft of the driving source stretches out and draws back to drive the connecting rod to swing, so that the swing rod is driven to swing, and finally the movable blade is driven to move through the swinging of the rotating shaft, so that the thread trimming is realized.

In the above-mentioned thread trimming mechanism, as another scheme, the transmission assembly includes the bar hole of seting up on the telescopic shaft of driving source, the length direction in bar hole is unanimous with the length direction of telescopic shaft, the other end of pendulum rod rotates and is provided with the round pin that rolls with this bar hole clearance fit. The telescopic shaft of the driving source stretches, the roll pin at the other end of the swing rod can slide in the strip-shaped hole, so that the swing rod is driven to swing, and finally the movable blade is driven to move through the swing of the rotating shaft, and thread trimming is achieved.

In one of the thread trimming mechanisms described above, the drive source includes an electromagnet.

In the thread trimming mechanism, the thread trimming mechanism further comprises a mounting seat capable of being fixed on a head of the sewing machine, a sliding rail is arranged on the mounting seat, and a sliding block in sliding fit with the sliding rail is arranged at the lower end of the electromagnet. The fixing of the mounting seat can be realized by means of screws and the like; the mounting seat is provided with the sliding rail, so that the mounting position of the electromagnet can be conveniently debugged, and the precision error generated during part processing can be overcome; if the sliding rail is directly designed on the machine head of the sewing machine, the curved surface of the machine head of the sewing machine is more, so that the installation difficulty is higher, and the attractiveness is influenced.

In the above thread trimming mechanism, the thread trimming mechanism further includes a lifting plate connected to the pressing rod. The lifting plate can be connected with a presser foot lifting mechanism of the sewing machine to drive the pressing rod to lift.

Compared with the prior art, the utility model has the advantages of it is following:

when the thread is required to be cut, the driving source drives the swing rod to swing through the transmission assembly, and the swing rod is matched with the boss on the rotating shaft through the sliding groove in the through hole, so that the rotating shaft can be driven to swing, the movable blade at the lower end of the rotating shaft is driven to swing, and the movable blade is meshed with the fixed blade to cut the thread. When the presser foot needs to be lifted, the pressing plate rises, the rotating shaft can slide along the vertical direction relative to the oscillating bar, and the presser foot is lifted in cooperation with the rising of the pressing plate.

Drawings

Fig. 1 is a schematic structural diagram of the thread trimming mechanism.

Fig. 2 is a partially enlarged view of fig. 1.

In the figure, 1, a drive source; 2. a rotating shaft; 3. pressing the cap; 4. a pressure lever; 5. a swing rod; 6. a through hole; 7. a chute; 8. a boss; 9. a transmission assembly; 10. a connecting rod; 11. a mounting seat; 12. a slide rail; 13. a slider; 14. a lifting plate.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the thread cutting mechanism comprises a driving source 1, a rotating shaft 2, a pressing cap 3, a pressing rod 4 and a pressing plate, wherein the side wall of the pressing rod 4 is connected with a lifting plate 14, a movable blade and a fixed blade which can be meshed with each other are arranged on the pressing plate, the lower end of the rotating shaft 2 is connected with the movable blade and can drive the movable blade to swing, and the upper end of the rotating shaft 2 sequentially penetrates through the pressing rod 4 and the pressing cap 3; the wire cutting mechanism is characterized by further comprising a swing rod 5, wherein one end of the swing rod 5 is provided with a through hole 6, the wall of the through hole 6 is provided with a sliding chute 7 along the vertical direction, the upper end of the rotating shaft 2 penetrates through the through hole 6, the side wall of the rotating shaft 2 is provided with a boss 8 in sliding fit with the sliding chute 7, and preferably, the number of the sliding chutes 7 is two, and the two sliding chutes 7 are symmetrically distributed about the central line of the through hole 6; the bosses 8 are also two and are symmetrically distributed about the central line of the rotating shaft 2.

As shown in fig. 1, a transmission assembly 9 capable of driving the swing rod 5 to swing is disposed between the driving source 1 and the other end of the swing rod 5. In this embodiment, the transmission assembly 9 includes a connecting rod 10, the telescopic shaft of the driving source 1 is hinged to one end of the connecting rod 10, and the other end of the connecting rod 10 is hinged to the other end of the swing rod 5. As other schemes, the transmission assembly 9 includes a strip-shaped hole opened on the telescopic shaft of the driving source 1, the length direction of the strip-shaped hole is consistent with that of the telescopic shaft, and the other end of the swing rod 5 is rotatably provided with a roll pin movably matched with the strip-shaped hole.

In the present embodiment, the drive source 1 includes an electromagnet. Alternatively, the drive source 1 may be configured as a cylinder or the like.

In order to compensate for the precision error in the part processing, the thread trimming mechanism further comprises a mounting seat 11 capable of being fixed on the head of the sewing machine, a sliding rail 12 is arranged on the mounting seat 11, and a sliding block 13 in sliding fit with the sliding rail 12 is arranged at the lower end of the electromagnet. After the position of the electromagnet is adjusted, the electromagnet can be fixed on the mounting seat 11 by using screws or other fasteners.

When a thread is required to be cut, the driving source 1 drives the swing rod 5 to swing through the transmission component 9, and the swing rod 5 is matched with the boss 8 on the rotating shaft 2 through the sliding groove 7 on the through hole 6, so that the rotating shaft 2 can be driven to swing, the movable blade at the lower end of the rotating shaft 2 is driven to swing, and the movable blade is meshed with the fixed blade to cut the thread. When the presser foot needs to be lifted, the pressing plate rises, the rotating shaft 2 can slide along the vertical direction relative to the oscillating bar 5, and the presser foot is lifted in cooperation with the rising of the pressing plate.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A wire shearing mechanism comprises a driving source (1), a rotating shaft (2), a pressing cap (3), a pressing rod (4) and a pressing plate, wherein a movable blade and a fixed blade which can be meshed with each other are arranged on the pressing plate, the lower end of the rotating shaft (2) is connected with the movable blade and can drive the movable blade to swing, and the upper end of the rotating shaft (2) sequentially penetrates through the pressing rod (4) and the pressing cap (3); the wire cutting mechanism is characterized by further comprising a swing rod (5), a through hole (6) is formed in one end of the swing rod (5), a sliding groove (7) is formed in the hole wall of the through hole (6) in the vertical direction, the through hole (6) is penetrated through the upper end of the rotating shaft (2), a boss (8) in sliding fit with the sliding groove (7) is arranged on the side wall of the rotating shaft (2), and a transmission assembly (9) capable of driving the swing rod (5) to swing is arranged between the other end of the driving source (1) and the other end of the swing rod (5).

2. The thread trimming mechanism according to claim 1, wherein the two sliding grooves (7) are symmetrically distributed about the center line of the through hole (6); the number of the bosses (8) is two, and the bosses are symmetrically distributed about the center line of the rotating shaft (2).

3. The thread trimming mechanism according to claim 2, wherein the transmission assembly (9) comprises a connecting rod (10), the telescopic shaft of the driving source (1) is hinged with one end of the connecting rod (10), and the other end of the connecting rod (10) is hinged with the other end of the swinging rod (5).

4. The thread trimming mechanism according to claim 2, wherein the transmission assembly (9) comprises a strip-shaped hole formed in the telescopic shaft of the driving source (1), the length direction of the strip-shaped hole is consistent with the length direction of the telescopic shaft, and the other end of the swing rod (5) is rotatably provided with a roll pin movably matched with the strip-shaped hole.

5. The thread cutting mechanism according to claim 1 or 2 or 3 or 4, characterized in that the drive source (1) comprises an electromagnet.

6. The thread trimming mechanism according to claim 5, further comprising a mounting seat (11) capable of being fixed on a head of the sewing machine, wherein the mounting seat (11) is provided with a sliding rail (12), and the lower end of the electromagnet is provided with a sliding block (13) in sliding fit with the sliding rail (12).

7. The thread trimming mechanism according to claim 1, characterized in that it further comprises a lifting plate (14) connected to the presser bar (4).