CN201605426U

CN201605426U - Thread cutting device for sewing machine

Info

Publication number: CN201605426U
Application number: CN200920263019XU
Authority: CN
Inventors: 谢新伟
Original assignee: ZHONGSHAN GRAND PRECISION INDUSTRIAL Ltd
Current assignee: ZHONGSHAN GRAND PRECISION INDUSTRIAL Ltd
Priority date: 2009-11-14
Filing date: 2009-11-14
Publication date: 2010-10-13
Anticipated expiration: 2019-11-14

Abstract

The utility model discloses a thread cutting device for a sewing machine, comprising a moving knife installed on the top of a rotating shaft and a fixed knife installed on a knife seat, the rotating shaft is sleeved on the knife seat, and the moving knife and the fixed knife are made to fit close to each other through a spring, the rotating shaft rotates to drive the moving knife to rotate so as to form a shearing force between the moving knife and the fixed knife to cut the thread end, wherein: a fine-tuning device is arranged on the fixed knife, and the position of the fixed knife is adjusted by the fine-tuning device so as to improve the matching clearance between the moving knife and the fixed knife. The utility model has a simple structure, and the matching clearance between the moving knife and the fixed knife is adjusted by the fine-tuning device, so as to achieve the purpose of improving the shearing quality, thereby improving the working efficiency and extending the service life of the knife.

Description

A kind of Sewing machines thread cutting device

(1) technical field:

The utility model relates to a kind of Sewing machines thread cutting device.

(2) background technology:

The existing sewing machine thread cutting device, comprise the stationary knife that is installed on the body, and the moving knife that cooperates with stationary knife, moving knife is installed in the rotating shaft and is movable around the shaft, it is tangent that stationary knife is provided with the blade of a plane and moving knife, cuts off sewing thread when the moving knife activity is tangent to stationary knife place and stationary knife.After use after a while, becoming flexible can appear in the connection between moving knife and the rotating shaft, and this directly influences to the cooperation of moving knife and stationary knife; Occurring wear also influences the tangent line quality between moving knife and the stationary knife simultaneously.

(3) utility model content:

In order to overcome the deficiencies in the prior art, the utility model provides a kind of Sewing machines thread cutting device, can prolong cutter life, improves shearing quality, increases work efficiency.

The utility model is to realize by following technical scheme:

A kind of Sewing machines thread cutting device, comprise the moving knife that is installed in the rotating shaft top, be installed in the stationary knife on the tool rest, shaft set is on tool rest, and make moving knife and stationary knife near cooperating by spring, thereby rotate drive moving knife rotation formation shearing force between moving knife and stationary knife by rotating shaft and cut off the end of a thread, wherein: stationary knife is provided with a micromatic setting, thereby improves the fit clearance of moving knife and stationary knife by the position of micromatic setting adjustment stationary knife.

The utility model compared with prior art, following advantage is arranged: the utility model is simple in structure, adjusts the fit clearance of moving knife and stationary knife by micromatic setting, reaches the purpose of improving shearing quality, thereby increases work efficiency, prolongation cutter life.

Above-mentioned described micromatic setting comprises adjusting rod and the screw that stretches out from stationary knife one side, and it is corresponding with screw on the tool rest that through hole is set on the adjusting rod, and screw passes through hole and is screwed into screw, thereby the head of screw compresses the adjusting rod end face stationary knife is located.

The diameter of above-mentioned described through hole is bigger than the diameter at screw middle part.

Above-mentioned described spring housing is in rotating shaft, and projection is installed at the middle part of rotating shaft, and spring one end withstands on the projection, and the other end withstands on the tool rest.

The periphery of above-mentioned described moving knife is provided with screening glass, and described screening glass is installed on the stationary knife.Screening glass is trapped among the periphery of moving knife, and it is injured to prevent to run into moving knife when the workman from working.

Above-mentioned described rotating shaft afterbody is equipped with driving mechanism, this driving mechanism comprises electromagnetic valve, swing arm and short connecting rod, one end and the valve rod of described short connecting rod are hinged, the other end and swing arm are hinged, described rotating shaft is fixedly mounted on the other end of swing arm, make the stem movement of electromagnetic valve by the adhesive of electromagnetic valve, drive transmission mechanism rotating shaft is rotated, thereby moving knife is rotated around the axis and cooperate with stationary knife.By the rotation of electromagnetic valve drive transmission mechanism control cutter head, principle is simple and practical, low cost of manufacture, reliable operation.

(4) description of drawings:

Below in conjunction with accompanying drawing the utility model is done detailed explanation:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is explosive element figure of the present utility model;

Fig. 3 is a cut-away view of the present utility model;

Fig. 4 is the A-A enlarged drawing of Fig. 3;

Fig. 5 is a user mode reference diagram of the present utility model.

(5) specific embodiment:

As Fig. 1, Fig. 2, Fig. 3, Fig. 4 and shown in Figure 5, the utility model comprises the moving knife 1 that is installed in rotating shaft 5 tops, is installed in the stationary knife 3 on the tool rest 2, rotating shaft 5 is sleeved on the tool rest 2, and make moving knife 1 and stationary knife 3 near cooperating by spring 4, thereby rotate drive moving knife 1 rotation formation shearing force between moving knife 1 and stationary knife 3 by rotating shaft 5 and cut off the end of a thread, wherein: stationary knife 3 is provided with a micromatic setting, thereby improves the fit clearance of moving knife 1 and stationary knife 3 by the position of micromatic setting adjustment stationary knife 3.The utility model is simple in structure, by the fit clearance of micromatic setting adjustment moving knife 1 with stationary knife 3, reaches the purpose of improving shearing quality, thereby increases work efficiency, and prolongs cutter life.

Above-mentioned described micromatic setting comprises adjusting rod 6 and the screw 7 that stretches out from stationary knife 3 one sides, it is corresponding with screw 9 on the tool rest 2 that through hole 8 is set on the adjusting rod 6, screw 7 passes through hole 8 and is screwed into screw 9, thereby the head of screw 7 compresses adjusting rod 6 end faces to stationary knife 3 location.

The diameter of above-mentioned described through hole 8 is bigger than the diameter at screw 7 middle parts.

Above-mentioned described spring 4 is enclosed within the rotating shaft 5, and projection 10 is installed at the middle part of rotating shaft 5, and spring 4 one ends withstand on the projection 10, and the other end withstands on the tool rest 2.

The periphery of above-mentioned described moving knife 1 is provided with screening glass 11, and described screening glass 11 is installed on the stationary knife 3.Screening glass 11 is trapped among the periphery of moving knife 1, and it is injured to prevent to run into moving knife 1 when the workman from working.

Above-mentioned described rotating shaft 5 afterbodys are equipped with driving mechanism, this driving mechanism comprises electromagnetic valve 12, swing arm 13 and short connecting rod 14, one end and the electromagnetic valve valve rod 15 of described short connecting rod 14 are hinged, the other end and swing arm 13 are hinged, described rotating shaft 5 is fixedly mounted on the other end of swing arm 13, adhesive by electromagnetic valve 12 makes 15 motions of electromagnetic valve valve rod, drives transmission mechanism rotating shaft 5 is rotated, thereby make moving knife 15 rotate and cooperate with stationary knife 3 around the shaft.By the rotation of electromagnetic valve 12 drive transmission mechanism control cutter heads, principle is simple and practical, low cost of manufacture, reliable operation.Above-mentioned described driving mechanism also comprises sensor circuit module 16 and controller, described sensor circuit module 16 is installed in the situation of the front end induction sewing machine needle place cloth of moving knife 1, sense when sensor circuit module 16 and promptly to send signal after the eedle place does not have cloth to controller, controller is received control electromagnetic valve 12 adhesives behind the signal, moving knife 1 is rotated and cooperates with stationary knife.

The foregoing description is a better embodiment of the present utility model; but embodiment of the present utility model is not limited thereto; other are any not to deviate from change, the modification done under spiritual essence of the present utility model and the principle, substitute, combination, simplify; be the substitute mode of equivalence, be included within the protection domain of the present utility model.

Claims

1. A sewing machine thread cutting device, including a moving knife installed on the top of the rotating shaft, a fixed knife installed on the knife seat, the rotating shaft is set on the knife seat, and the moving knife and the fixed knife are closely matched by a spring, and the moving knife is driven by the rotation of the rotating shaft. The knife rotates to form a shearing force between the moving knife and the fixed knife to cut off the thread. It is characterized in that: a fine-tuning device is arranged on the fixed knife, and the position of the fixed knife is adjusted by the fine-tuning device to improve the matching gap between the moving knife and the fixed knife. .

2. A sewing machine thread cutting device according to claim 1, characterized in that: the fine-tuning device includes an adjustment rod and a screw protruding from one side of the fixed knife, and the through hole on the adjustment rod corresponds to the screw hole on the knife seat, The screw passes through the through hole and is screwed into the screw hole, and the head of the screw presses the top surface of the adjusting rod to position the fixed knife.

3. A sewing machine thread cutting device according to claim 2, characterized in that: the diameter of the through hole is larger than the diameter of the middle part of the screw.

4. A sewing machine thread cutting device according to claim 1, 2 or 3, characterized in that: the spring is sleeved on the rotating shaft, and a bump is installed in the middle of the rotating shaft, and one end of the spring is pushed against the bump, and the other end is pushed against the bump. on the knife block.

5. A sewing machine thread cutting device according to claim 4, characterized in that: a protective sheet is provided on the periphery of the movable knife, and the protective sheet is installed on the fixed knife.

6. A sewing machine thread cutting device according to claim 4, characterized in that: a driving mechanism is installed at the tail of the rotating shaft, and the driving mechanism includes a solenoid valve, a swing arm and a short connecting rod, the short connecting rod One end is hinged with the valve stem, and the other end is hinged with the swing arm. The rotating shaft is fixedly installed on the other end of the swing arm. The valve stem of the solenoid valve moves through the suction of the solenoid valve, drives the transmission mechanism and rotates the rotating shaft, so that The moving knife rotates around the rotating shaft and cooperates with the fixed knife.