Cutter mechanism for sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a cutter mechanism for a sewing machine, which comprises a casing, an upper shaft arranged in the casing, a cutter component mounted at the head of the front end of the casing, a mounting seat arranged on the side of the front end of the casing, a cutter shaft arranged in the mounting seat, and a cutter crank I mounted on the periphery of one end of the cutter shaft. The other end of the first cutter crank is connected with the upper shaft through an eccentric connecting rod, the periphery of the other end of the cutter shaft is provided with a second cutter crank, the other end of the second cutter crank is connected with a first connecting rod, the other end of the first connecting rod is connected with a second connecting rod, and the other end of the second connecting rod is provided with a clutch piece so as to be connected with or separated from the cutter assembly. In the actual working process, the cutter shaft is driven to move through the upper shaft, then the cutter assembly is driven to move up and down through the first connecting rod and the second connecting rod, the cloth cutting action is achieved, the mechanism is simple in design, the number of parts is small, and cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and specifically to a cutting mechanism for a sewing machine. Background Technology

[0002] Currently, existing sewing machines equipped with side-cutting devices can complete both sewing and edge trimming in one operation.

[0003] For example, Chinese Utility Model Patent No. CN202221720868.5 discloses a differential flat sewing machine cutter mounting structure, including a housing, an upper shaft, a cutter assembly, a connecting rod assembly, and a wrench assembly; the housing has a notch on its back side, and the notch extends outward to form a protective cover; the wrench assembly includes a wrench shaft and a wrench, the wrench shaft is at least partially disposed inside the protective cover, and the wrench is disposed at the end of the wrench shaft.

[0004] The structure of this mechanism is quite complex and has many parts, so further improvements are needed. Utility Model Content

[0005] The purpose of this invention is to provide a cutting mechanism for a sewing machine, which solves the problem of complex existing structures through a more reasonable structural design.

[0006] The purpose of this utility model is achieved as follows: A cutting mechanism for a sewing machine includes a housing, an upper shaft inside the housing, a cutting assembly mounted at the front end of the housing, a mounting base on the side of the front end of the housing, a cutting shaft inside the mounting base, a cutting crank one mounted on the outer periphery of one end of the cutting shaft, the other end of the cutting crank one connected to the upper shaft via an eccentric connecting rod, a cutting crank two mounted on the outer periphery of the other end of the cutting shaft, a connecting rod one connected to the other end of the cutting crank two, a connecting rod two connected to the other end of the connecting rod one, a clutch at the other end of the connecting rod two for engaging or disengaging the cutting assembly, a connecting member hinged to the middle end of the connecting rod two via a pin, the other end of the connecting member being fixed to the machine head, and a locking wrench for pushing the cutting assembly to move mounted on the outer periphery of the pin.

[0007] Preferably, the mounting base has mounting holes, and both ends of the cutter shaft are rotatably mounted in the mounting holes via bushings.

[0008] Preferably, one end of the eccentric connecting rod is formed with a connecting rod portion, and the end of the connecting rod portion is provided with a sliding member. The other end of the cutter crank is formed with a connecting portion, and a strip-shaped hole is provided in the connecting portion for the sliding member to move.

[0009] Preferably, the cutter assembly includes a guide post disposed on the lower end face of the machine head, a mounting bracket movably disposed on the outer periphery of the guide post, and a blade disposed on one side of the mounting bracket.

[0010] Preferably, the side of the mounting bracket is formed with a fixing groove for the clutch to be engaged.

[0011] Preferably, the side of the mounting bracket is formed with a pushing part for the locking wrench to push.

[0012] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0013] In actual operation, this invention drives the cutter shaft through the upper shaft, which in turn drives the cutter assembly to move up and down through connecting rod one and connecting rod two, thus realizing the fabric cutting action. The mechanism has a simple design, few parts, and reduced costs. By controlling the clutch, the connection between connecting rod two and the cutter assembly can be separated, so that the cutter assembly is no longer driven to move and the fabric cutting action is not performed. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a sewing machine.

[0015] Figure 2 This is a schematic diagram of the main view structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 .

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0018] Reference numerals: 1-Machine housing; 2-Upper shaft; 3-Cutter assembly; 4-Mounting base; 5-Cutter shaft;

[0019] 6-Cutter crank one; 7-Eccentric connecting rod; 8-Cutter crank two; 9-Connecting rod one; 10-Connecting rod two;

[0020] 11-Clutch; 12-Pin; 13-Connector; 14-Head; 15-Locking wrench; 16-Mounting hole; 17-Sleeve; 18-Connecting rod; 19-Sliding part; 20-Connecting part; 21-Strip hole; 22-Guide post; 23-Mounting bracket; 24-Blade; 25-Fixing groove; 26-Pushing part. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1-4As shown, a cutting mechanism for a sewing machine includes a housing 1, an upper shaft 2 inside the housing 1, a cutting assembly 3 mounted at the front end of the housing 1 (head 14), a mounting base 4 on the side of the front end of the housing 1, a cutting shaft 5 inside the mounting base 4, a cutting crank 6 mounted on the outer periphery of one end of the cutting shaft 5, the other end of the cutting crank 6 connected to the upper shaft 2 via an eccentric connecting rod 7, a cutting crank 8 mounted on the outer periphery of the other end of the cutting shaft 5, a connecting rod 9 connected to the other end of the cutting crank 8, a connecting rod 10 connected to the other end of the connecting rod 9, a clutch 11 at the other end of the connecting rod 10 for connecting or disengaging the cutting assembly 3, a connecting member 13 hinged to the middle end of the connecting rod 10 via a pin 12, the other end of the connecting member 13 fixed to the head 14, and a locking wrench 15 for pushing the cutting assembly 3 to move mounted on the outer periphery of the pin 12.

[0023] In actual operation, the upper shaft 2 drives the cutting shaft 5 to move, which in turn drives the cutting assembly 3 to move up and down through connecting rod 1 9 and connecting rod 2 10, thus realizing the fabric cutting action. The mechanism has a simple design, few parts, and reduced costs. By controlling the clutch 11, the connection between connecting rod 2 10 and the cutting assembly 3 can be separated, so that the cutting assembly is no longer driven to move and the fabric cutting action is not performed.

[0024] The mounting base 4 has a mounting hole 16, and both ends of the cutter shaft 5 are rotatably mounted in the mounting hole 16 through bushings 17 to keep it rotating stably.

[0025] One end of the eccentric connecting rod 7 is formed with a connecting rod portion 18, and a sliding member 19 is provided at the end of the connecting rod portion 18. The other end of the cutter crank 6 is formed with a connecting portion 20, and a strip hole 21 for the sliding member 19 to move is provided in the connecting portion 20. During the rotation of the upper shaft 2, the sliding member 19 will reciprocate within the strip hole 12 through the eccentric connecting rod 7, thereby driving the cutter crank 6 and the cutter shaft 5 to reciprocate.

[0026] The cutter assembly 3 includes a guide post 22 disposed on the lower end face of the head 14. A mounting bracket 23 is disposed on the outer periphery of the guide post 22, which can move up and down. A blade 24 is disposed on one side of the mounting bracket 23.

[0027] Combination Figure 3 and Figure 4The mounting bracket 23 has a fixed groove 25 formed on its side for the clutch 11 to be inserted. A spring is provided in the clutch 11 to keep it moving towards the side of the mounting bracket 23. When there is no external force, the end of the clutch 11 abuts against the fixed groove 25. When the connecting rod 10 swings, it will drive the mounting bracket 23 to move at the same time. A spring is abutting the lower end of the mounting bracket 23 or a tension spring is connected to the upper end of the mounting bracket 23 to keep the mounting bracket 23 moving upward. When the clutch 11 is pulled to move and its end leaves the fixed groove 25, the mounting bracket 23 will move upward automatically by the elastic force of the spring, thereby separating the connection between the connecting rod 10 and the cutter assembly 3, and no longer driving the cutter assembly to move, and not performing the cutting action.

[0028] Combination Figure 3 and Figure 4 The mounting bracket 23 has a pushing part 26 formed on its side for the locking wrench 15 to push. In actual operation, by pressing the locking wrench 15 downward, the mounting bracket 23 can be pushed downward through the pushing part 26, thereby causing the end of the clutch 11 to re-engage in the fixing groove 25.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A cutting mechanism for a sewing machine, characterized in that, The assembly includes a housing (1), an upper shaft (2) is installed inside the housing (1), a cutter assembly (3) is installed at the front end of the housing (1) at the head (14), a mounting base (4) is provided on the side of the front end of the housing (1), a cutter shaft (5) is installed inside the mounting base (4), a cutter crank one (6) is installed on the outer periphery of one end of the cutter shaft (5), the other end of the cutter crank one (6) is connected to the upper shaft (2) through an eccentric connecting rod (7), and a cutter crank two (8) is installed on the outer periphery of the other end of the cutter shaft (5). The other end of the second cutter crank (8) is connected to the first connecting rod (9), the other end of the first connecting rod (9) is connected to the second connecting rod (10), the other end of the second connecting rod (10) is provided with a clutch (11) to connect or disconnect the cutter assembly (3), the middle end of the second connecting rod (10) is hinged to a connector (13) via a pin (12), the other end of the connector (13) is fixed to the machine head (14), and a locking wrench (15) for pushing the cutter assembly (3) to move is installed on the outer periphery of the pin (12).

2. The cutting mechanism for a sewing machine according to claim 1, characterized in that: The mounting base (4) has a mounting hole (16) and the two ends of the cutter shaft (5) are rotatably mounted in the mounting hole (16) through bushings (17).

3. The cutting mechanism for a sewing machine according to claim 1, characterized in that: One end of the eccentric connecting rod (7) is formed with a connecting rod portion (18), and a sliding member (19) is provided at the end of the connecting rod portion (18). The other end of the cutter crank (6) is formed with a connecting portion (20), and a strip hole (21) for the sliding member (19) to move is provided in the connecting portion (20).

4. The cutting mechanism for a sewing machine according to claim 1, characterized in that: The cutter assembly (3) includes a guide post (22) disposed on the lower end face of the head (14), a mounting bracket (23) is movably disposed on the outer periphery of the guide post (22), and a blade (24) is disposed on one side of the mounting bracket (23).

5. The cutting mechanism for a sewing machine according to claim 4, characterized in that: The mounting bracket (23) has a fixing groove (25) formed on its side for the clutch (11) to be inserted.

6. The cutting mechanism for a sewing machine according to claim 4, characterized in that: The mounting bracket (23) has a pusher (26) formed on its side for the locking wrench (15) to push.

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