Independent thread trimming driving mechanism for button sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to an independent thread trimming driving mechanism for a button sewing machine, which comprises a thread trimming electromagnet, a telescopic shaft is arranged in the thread trimming electromagnet, one end of the telescopic shaft is hinged with a connecting piece, the other end of the connecting piece is provided with a first connecting rod, and the front end of the first connecting rod is hinged with a second connecting rod. The other end of the second connecting rod is hinged to a third connecting rod, the other end of the third connecting rod is hinged to a fourth connecting rod, the other end of the fourth connecting rod is connected with a thread trimming driving rod, and a thread trimming assembly is installed at the end of the thread trimming driving rod. According to the thread trimming mechanism, the thread trimming assembly can be independently controlled to act and execute the thread trimming action through the thread trimming electromagnet and the connecting rod assembly, the mechanism is simple in structure and can independently achieve the thread trimming action, and therefore the thread trimming electromagnet can drive the thread trimming assembly firstly and then conduct lifting and pressing after thread trimming is completed, the thread end can be short, the stitch is more attractive, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to an independent thread cutting drive mechanism for a button sewing machine. Background Art

[0002] At present, various thread cutting mechanisms of sewing machines are connected with the presser foot lifting mechanism and share an electromagnet for driving. The action of the electromagnet first acts on the presser foot lifting device, and at the same time, the action is transmitted to the thread cutting device through a connecting piece to perform thread cutting. The disadvantages of this mechanism are as follows: the mechanism is relatively complex; the parts are not easy to process. Thread cutting and presser foot lifting cannot independently achieve their respective actions. Sometimes in garment processing, there are situations where only thread cutting is required without lifting the presser foot or the presser foot is lifted with a delay after thread cutting, which cannot be achieved by the linkage mechanism. Content of the Utility Model

[0003] The purpose of the utility model is to provide an independent thread cutting drive mechanism for a button sewing machine, which solves the problem that the thread cutting cannot achieve independent actions through an independent thread cutting drive mechanism.

[0004] The purpose of the utility model is achieved as follows: an independent thread cutting drive mechanism for a button sewing machine includes a thread cutting electromagnet. A telescopic shaft is arranged inside the thread cutting electromagnet. One end of the telescopic shaft is hinged with a connecting piece. The other end of the connecting piece is installed with a first connecting rod. The front end of the first connecting rod is hinged with a second connecting rod. The other end of the second connecting rod is hinged with a third connecting rod. The other end of the third connecting rod is hinged with a fourth connecting rod. The other end of the fourth connecting rod is connected with a thread cutting drive rod. A thread cutting assembly is installed at the end of the thread cutting drive rod.

[0005] Preferably, a vertical groove is formed at one end of the telescopic shaft. The connecting piece is arranged inside the vertical groove. A hinge shaft is installed between the lower end of the connecting piece and the telescopic shaft.

[0006] Preferably, a first connecting portion is formed at the upper end of the connecting piece. A first fixing hole is formed on the first connecting portion. A first elongated hole is formed on the first connecting rod. A first fastener is installed between the first elongated hole and the first fixing hole.

[0007] Preferably, the rear end of the first connecting rod is fixed on the thread cutting electromagnet. A second elongated hole for inserting a second fastener is formed at the rear end of the first connecting rod.

[0008] Preferably, the middle end of the third connecting rod is hinged with the machine body.

[0009] Preferably, a retaining ring is sleeved on the outer periphery of the telescopic shaft. A spring is arranged between the retaining ring and the end face of the thread cutting electromagnet. The spring is sleeved on the outer periphery of the telescopic shaft.

[0010] Preferably, a mounting bracket is installed on the side surface of the thread cutting electromagnet to fix it on the side surface of the machine body.

[0011] The prominent and beneficial technical effects of the present utility model compared with the prior art are as follows:

[0012] Through the design of an independent thread cutting drive mechanism, during the actual working process, the thread cutting electromagnet can separately control the action of the thread cutting component through the connecting rod assembly to perform the thread cutting action. This mechanism has a simple structure and can independently achieve the thread cutting action, enabling the thread cutting electromagnet to drive the thread cutting component first and then perform lifting and pressing after the thread cutting is completed. This can make the thread end shorter, the stitch more beautiful, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a button sewing machine.

[0014] Figure 2 It is a schematic structural diagram of the machine body and the thread cutting drive mechanism.

[0015] Figure 3 It is a schematic assembly structural diagram of the thread cutting drive mechanism.

[0016] Figure 4 It is a schematic exploded structural diagram of the parts of the thread cutting drive mechanism.

[0017] Reference numerals: 1 - thread cutting electromagnet; 2 - telescopic shaft; 3 - connecting piece; 4 - connecting rod one; 5 - connecting rod two; 6 - connecting rod three; 7 - connecting rod four; 8 - thread cutting drive rod; 9 - thread cutting component; 10 - vertical groove; 11 - hinge shaft; 12 - connecting part one; 13 - fixing hole one; 14 - strip hole one; 15 - fastener one; 16 - strip hole two; 17 - fastener two; 18 - retaining ring; 19 - spring; 20 - mounting bracket; 21 - machine body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further details the specific embodiments of the present utility model with reference to the drawings.

[0019] As Figures 1-4 shown, an independent thread cutting drive mechanism for a button sewing machine includes a thread cutting electromagnet 1. A telescopic shaft 2 is arranged inside the thread cutting electromagnet 1. One end of the telescopic shaft 2 is hinged with a connecting piece 3. The other end of the connecting piece 3 is installed with a connecting rod one 4. The front end of the connecting rod one 4 is hinged with a connecting rod two 5. The other end of the connecting rod two 5 is hinged with a connecting rod three 6. The other end of the connecting rod three 6 is hinged with a connecting rod four 7. The other end of the connecting rod four 7 is connected with a thread cutting drive rod 8. The end of the thread cutting drive rod 8 is installed with a thread cutting component 9.

[0020] Through the design of an independent thread cutting drive mechanism, during the actual working process, the thread cutting electromagnet can independently control the action of the thread cutting assembly 9 through the connecting rod assembly to perform the thread cutting action. This mechanism has a simple structure and can independently achieve the thread cutting action, enabling the thread cutting electromagnet to drive the thread cutting assembly first and then perform lifting and pressing after the thread cutting is completed. This can make the thread end shorter, the stitch more beautiful, and reduce production costs.

[0021] One end of the telescopic shaft 2 is provided with a vertical groove 10, and the connecting piece 3 is arranged in the vertical groove 10. An articulated shaft 11 is installed between the lower end of the connecting piece 3 and the telescopic shaft 2 to achieve the articulated connection between the telescopic shaft and the connecting piece 3. This connection structure is simple and convenient for assembly.

[0022] The upper end of the connecting piece 3 is formed with a first connecting portion 12, and a first fixing hole 13 is opened on the first connecting portion 12. A first elongated hole 14 is opened on the first connecting rod 4, and a first fastener 15 is installed between the first elongated hole 14 and the first fixing hole 13. Through the design of the elongated hole in this technical solution, the installation position of the first connecting rod 4 can be adjusted, thereby reducing the machining and assembly precision of parts and facilitating adjustment of the installation.

[0023] The rear end of the first connecting rod 4 is movably fixed on the thread cutting electromagnet 1. A second elongated hole 16 for inserting a second fastener 17 is opened at the rear end of the first connecting rod 4, and the first connecting rod 4 can move around the outer circumference of the second fastener 17 through this second elongated hole 16, thereby improving the stability of the first connecting rod 4 during movement.

[0024] The middle end of the third connecting rod 6 is articulated with the machine body 21.

[0025] A retaining ring 18 is clamped on the outer circumference of the telescopic shaft 2. A spring 19 is arranged between the retaining ring 18 and the end face of the thread cutting electromagnet 1. The spring 19 is sleeved on the outer circumference of the telescopic shaft 2. During the actual working process, when the electromagnet works, it will attract the telescopic shaft 2 to retract backward, and the spring 19 will be compressed. When the electromagnet loses power, the telescopic shaft 2 will be pushed forward by the acting force of the spring to automatically reset, so as to drive the connecting rod and the thread cutting assembly to perform the thread cutting action.

[0026] An installation frame 20 is installed on the side of the thread cutting electromagnet 1 to fix it on the side of the machine body 21.

[0027] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An independent thread cutting drive mechanism for a button sewing machine, characterized in that, It includes a wire-cutting electromagnet (1). A telescopic shaft (2) is arranged inside the wire-cutting electromagnet (1). One end of the telescopic shaft (2) is hinged with a connecting piece (3). The other end of the connecting piece (3) is installed with a first connecting rod (4). The front end of the first connecting rod (4) is hinged with a second connecting rod (5). The other end of the second connecting rod (5) is hinged with a third connecting rod (6). The other end of the third connecting rod (6) is hinged with a fourth connecting rod (7). The other end of the fourth connecting rod (7) is connected with a wire-cutting driving rod (8). The end of the wire-cutting driving rod (8) is installed with a wire-cutting assembly (9); A vertical groove (10) is opened at one end of the telescopic shaft (2). The connecting piece (3) is arranged inside the vertical groove (10). An articulated shaft (11) is installed between the lower end of the connecting piece (3) and the telescopic shaft (2); A first connecting part (12) is formed at the upper end of the connecting piece (3). A first fixing hole (13) is opened on the first connecting part (12). A first strip-shaped hole (14) is opened on the first connecting rod (4). A first fastener (15) is installed between the first strip-shaped hole (14) and the first fixing hole (13); The rear end of the first connecting rod (4) is fixed on the wire-cutting electromagnet (1). A second strip-shaped hole (16) for inserting a second fastener (17) is opened at the rear end of the first connecting rod (4); A retaining ring (18) is clamped on the outer periphery of the telescopic shaft (2). A spring (19) is arranged between the retaining ring (18) and the end face of the wire-cutting electromagnet (1). The spring (19) is sleeved on the outer periphery of the telescopic shaft (2).

2. The independent thread cutting drive mechanism for a button sewing machine according to claim 1, characterized in that: The middle end of the third connecting rod (6) is hinged with the machine body (21).

3. The independent thread cutting drive mechanism for a button sewing machine according to claim 1, characterized in that: An installation bracket (20) is installed on the side surface of the wire-cutting electromagnet (1) so that it is fixed on the side surface of the machine body (21).

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