CN211872269U - A thread trimming mechanism for an overlock sewing machine - Google Patents

Abstract

The utility model discloses a thread trimming mechanism of an overlock sewing machine, which comprises a knife rest, wherein the knife rest is provided with a vertical plate and a double-section hole, the end of the vertical plate is provided with a material blocking plate, and the double-section A rotating shaft is arranged through the hole, an electromagnet assembly is fixedly connected to the protruding end of the rotating shaft, a moving knife is fixedly connected to the other end of the rotating shaft, and a fixed knife is fixedly arranged on the knife holder opposite to the blade of the moving knife. Through the rotation of the rotating shaft, a circular arc motion is driven to mesh with the fixed knife. The front end of the blade of the fixed knife is also provided with a receiving light eye, and the sewing machine casing directly above the receiving light eye is provided with a transmitting light eye corresponding to the receiving light eye. The utility model designs the receiving light eye in front of the edge of the fixed knife, the distance S between the fixed knife cutting edge and the receiving light eye is fixed, the cut wire braid is extremely short, and the length can be close to zero, and no manual trimming is required. And through the adjustment of the control system, the length of the long braid cut by the trimmer can be adjusted.

Description

A thread trimming mechanism for an overlock sewing machine

technical field

The utility model relates to the field of sewing machines, in particular to a thread trimming mechanism of an overlock sewing machine.

Background technique

At present, the automatic overlock sewing machine is equipped with an automatic thread trimming mechanism. When the sewing material leaves the emitting light, the optical signal changes and is converted into a corresponding electrical signal, which is transmitted to the control system to control the action of the thread trimming mechanism to complete the thread trimming braid. action.

However, the emitting light eye of the thread trimming mechanism of the overlock sewing machine on the market is located behind the cutting edge of the fixed knife. When the fabric leaves the emitting electric eye, the thread trimming mechanism acts and the thread braid is cut, and there will be a certain delay. Such a thread braid has a longer thread head , and the structural defects cannot be compensated by the adjustment of system parameters, which requires manual trimming with yarn scissors, which wastes man-hours and affects the efficiency of production.

Utility model content

In view of this, in order to solve the problem that the thread end of the thread braid cut by the thread trimming mechanism of the existing overlock sewing machine is long, it needs to be trimmed manually with a yarn scissor, which wastes man-hours and affects the efficiency of production, and provides an overlock sewing machine. Sewing machine thread trimming mechanism.

In order to solve the problems existing in the prior art, the technical scheme of the present utility model is: a thread trimming mechanism for an overlock sewing machine, which is characterized in that it comprises a knife rest, the knife rest is provided with a vertical plate and a double-section hole, and the The end of the vertical plate is provided with a baffle plate, a rotating shaft is arranged through the double-section hole, an electromagnet assembly is fixedly connected to the extending end of the rotating shaft, and a moving knife is fixedly connected to the other end of the rotating shaft, which is connected with the moving knife. A fixed knife is fixed on the knife holder opposite the blade, and the movable knife is driven by the rotation of the rotating shaft to make an arc motion to engage with the fixed knife. The casing of the sewing machine is provided with an emission light eye corresponding to the receiving light eye.

As a further arrangement of this solution, a connecting rod and a cutter pin are also provided on the tool holder, and the electromagnet assembly is fixed by the connecting rod and the cutter pin.

As a further arrangement of this solution, the movable knife is welded on one end of the rotating shaft, and is flush with the edge of the fixed knife when engaged.

As a further arrangement of this solution, the receiving light eye is encapsulated in a transparent plastic shell, and is detachably fixed on the tool holder through screws.

Compared with the prior art, the advantages of the present utility model are as follows:

The utility model has a simple structure, can conveniently and quickly realize the control and adjustment of the length of the wire braid, and meets the diverse needs of customers. That is, in front of the fixed knife. During the working process, the cutting material first passes through the light eye, and the system passes the thread trimming command and executes the program. At the same time, after the thread trimming mechanism that has received the signal starts to move, the cutting material passes through the moving knife and the fixed knife. , through the adjustment of electric control, the length of the wire braid passing through the wire cutting mechanism can be further shortened according to the actual situation. Compared with the existing product technical scheme, the wire braid cut by the utility model can hardly be cut again, avoiding the mechanical and program delay. The resulting incomplete thread trimming completely avoids the sewing workers from reprocessing, which greatly improves the work efficiency.

Description of drawings

Fig. 1 is the installation position diagram of the utility model thread trimming mechanism;

Fig. 2 is the schematic diagram of the utility model tool holder;

3 is a schematic diagram of the connection between the electromagnet assembly and the tool holder of the present invention;

FIG. 4 is a schematic diagram of the position structure of the optical eye and the fixed knife of the present invention.

Reference signs: 1. Rotating shaft; 2. Tool holder; 3. Fixed knife; 4. Receiving light eye; 5. Moving knife; 6. Material stopper; 7. Presser foot shell; 8. Needle plate; 9. Electromagnet Components; 10. Cutter pin; 11. Connecting rod; 12. Emitting light eye.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

As shown in Figures 1-4, this embodiment provides a thread trimming mechanism for an overlock sewing machine, which is characterized in that it includes a knife rest 2, the knife rest 2 is provided with a vertical plate and a double-section hole, the vertical plate The end of the shaft is provided with a baffle plate 6, a rotating shaft 1 is arranged through the double-section hole, an electromagnet assembly 9 is fixedly connected to the extending end of the rotating shaft 1, and a moving knife 5 is fixedly connected to the other end of the rotating shaft 1. A fixed knife 3 is fixedly arranged on the knife holder 2 opposite to the blade of the movable knife 5, and the movable knife 5 is driven by the rotation of the rotating shaft 1 to make an arc movement to engage with the fixed knife 3, and the front end of the blade of the fixed knife 3 is also provided with a receiving device. The light eye 4 is provided, and an emission light eye 12 corresponding to the receiving light eye 4 is arranged on the sewing machine casing just above the receiving light eye 4 .

As a further arrangement of this solution, the tool holder 2 is also provided with a connecting rod 11 and a cutter pin 10 , and the electromagnet assembly 9 is fixed by the connecting rod 11 and the cutter pin 10 .

As a further arrangement of this solution, the movable knife 5 is welded to one end of the rotating shaft 1, and is flush with the edge of the fixed knife 3 during meshing.

As a further arrangement of this solution, the receiving light eye 4 is encapsulated in a transparent plastic shell, and is detachably fixed on the tool holder 2 by screws.

The working principle of this scheme: During the sewing process, when the sewing material leaves the receiving electric eye 4, the optical signal is converted into an electrical signal, and the receiving electric eye 12 feeds back the signal change to the control system. After the control system waits for the time t, it immediately responds to the thread trimming electromagnet assembly 9 action, the electromagnet assembly 9 drives the rotating shaft 1 to move through the connecting rod pin 10 and the connecting rod 11, the moving knife 5 is fixed on the rotating shaft, and also performs circular arc motion, and completes the meshing with the fixed knife 3 to realize the action of trimming, which can ensure At this time, the length of the wire braid is the shortest; when the waiting time is greater than t, the length of the wire braid can be adjusted according to the actual needs of the customer.

In the utility model, the receiving light eye 4 is designed in front of the cutting edge of the fixed knife 3, the distance S between the cutting edge of the fixed knife 3 and the receiving light eye 4 is fixed, the automatic sewing speed is constant, and the control system controls the thread trimming mechanism to delay t=s/ After v responds to the action, the wire braid is cut, so that the wire braid is short, if the response delay time is greater than the time t, the length of the wire braid can be adjusted.

The above description should not be construed as a limitation of the present invention, but is only used to help illustrate the present invention. The preferred embodiment does not describe all the details in detail, nor does it limit the utility model to only the described specific embodiments. Any modification, equivalent replacement, improvement, etc. made within the design concept of the present utility model shall include within the scope of protection of the present invention. This specification selects and describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art can better understand and utilize the present invention.

Claims (4)

1. A thread trimming mechanism for an overlock sewing machine, characterized in that it comprises a knife rest (2), the knife rest (2) is provided with a vertical plate and a double-section hole, and the end of the vertical plate is provided with a stopper A material plate (6), a rotating shaft (1) is arranged through the double-section hole, an electromagnet assembly (9) is fixedly connected to the extending end of the rotating shaft (1), and the other end of the rotating shaft (1) is fixedly connected and arranged The movable knife (5) is fixedly provided with a stationary knife (3) on the knife holder (2) opposite to the blade edge of the movable knife (5), and the movable knife (5) is driven by the rotation of the rotating shaft (1) to perform circular motion and fixed motion. The knife (3) is engaged, the front end of the blade of the fixed knife (3) is further provided with a receiving light eye (4), and a receiving light eye (4) is provided on the sewing machine casing directly above the receiving light eye (4). Corresponding emission photo eyes (12). 2. A thread trimming mechanism for an overlock sewing machine according to claim 1, characterized in that: a connecting rod (11) and a cutter pin (10) are also provided on the knife holder (2), and the electromagnetic The iron assembly (9) is fixed by the connecting rod (11) and the cutter pin (10). 3. A thread trimming mechanism for an overlock sewing machine according to claim 2, characterized in that: the movable knife (5) is welded and arranged at one end of the rotating shaft (1), and is connected to the fixed knife (3) when engaged. The cutting edge is flush. 4. A thread trimming mechanism of an overlock sewing machine according to claim 3, characterized in that: the light receiving eye (4) is encapsulated in a transparent plastic shell, and is detachably fixed on the knife holder (2) by screws .

Images