KR910003896Y1 - Automatic severing device of sewing thread for sewing machine - Google Patents

Abstract

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Description

Automatic thread trimmer for sewing machine

1 is an installation state of the present invention.

2 is a main portion of the present invention.

3 is a front view of the main part of the present invention.

4 is an operation of the initial progress state according to the use of the present invention.

5 is an operation of the intermediate state in accordance with the use of the present invention.

FIG. 6 is a cross-sectional view of FIG. 5.

7 is an operation of the final state according to the use of the present invention.

8 is a cross-sectional view of the helix of FIG.

* Explanation of symbols for main parts of the drawings

1: mounting plate 2: rotating lever for vertical movement

3: rotating lever for horizontal movement 4: rotating lever for variable blade operation

2a, 3a, 4a: face rollers 2b, 3b, 4b: link bar

5: Moving piece 5a: Rail for vertical movement

5b: Rail for variable blade operation 5c: Rail for variable blade operation

6: wire 7: vertical movement port

8: horizontal movement hole 8 ': chin

9: Variable Blade Actuator 9 ': Tight

11: cutting blade coupler 11 ': jaw

12: fixed blade 13: variable blade

13 ': Chin 14: Guided Roller

15: return spring

The present invention pulls the wire connected to the separate clutch mechanism by the user's foot, the cutting edge is moved to the predetermined position by the lever and link mechanism to automatically cut the thread for the sewing machine (絲 絶) )

In general, sewing machines that require the use of both hands, especially for electric sewing machines that can digest large quantities of sewing materials by improving sewing efficiency due to fast sewing speed and convenience, are required to cut the finishing thread or narrow sewing materials during sewing. Since there is no separate means, there was an inconvenience to cut using scissors after stopping the operation of the sewing machine. Therefore, the closure caused by this decrease in sewing speed and further decrease the overall sewing efficiency is pointed out.

The present invention is devised to solve such a conventional discomfort and closed end at a time, and is rotated sequentially as the levers are moved by the pulling of the wire and the levers stacked in multiple stages are contacted to several guide rails of different lengths. This rotational operation is converted into vertical and horizontal movements by the link mechanism so that the cutting blades can be moved and cut.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

On the central axis (1 ') of the side of the mounting plate (1), the rotary lever (2) for horizontal movement, the rotary lever (3) for horizontal movement, and the variable blade operation are combined with the rotary lever (4) in three stages. At one end of the lever, the face rollers 2a, 3a and 4a are connected, and the other end is connected to the link bars 2b, 3b and 4b.

The face rollers 2a, 3a and 4a are long, medium and short vertical rails 5a, horizontal rails 5b and variable blade rails 5c, respectively. The rails are integrally connected to one side of the moving piece 5 which is moved back and forth by the wire 6.

Each of the link bars 2b, 3b, and 4b is connected to a vertically movable opening 7, a horizontally moving opening 8 on the guide 10, a variable blade operating opening 9, and the like. The cutting blade coupling sphere 11 with the jaw 11 'upwardly protruded is installed on the horizontal movement material, and the fixed blade 12 and the jaw 13' are protruded upwardly under the cutting blade coupling sphere 11. The blade 13 is installed.

At the bottom of the horizontal movable tool 8 and the variable blade actuating tool 9, as shown in FIGS. 6 and 8, the bumps 8 'and 9' are respectively protruded downward, so that the cutting blade coupling tool 11 2) correspond to the jaw 11 'and the jaw 13' on the variable blade 13, respectively.

Each of the moving members is guided as guide rollers 14, is shot as return springs 15, and the wire 6 is installed in the tube 6 ′ and connected to a separate clutch mechanism.

The present invention configured as described above is mounted on the side of the sewing machine 17 by covering the cover 16 as shown in Figure 1 and the wire 6 is connected to a separate clutch mechanism (not shown) and pulled at the foot position of the sewing thread By installing and using the operation, the cutting blade coupler 11 is moved vertically and horizontally by pulling the wire 6 and the cutting operation by the rotation of the variable blade 13 is sequentially performed. will be. The sequential operation of the cutting blade coupling tool 11 will be described in detail for each step according to the accompanying drawings.

In FIG. 4, when the wire 6 is pulled, the moving piece 5 connected thereto is also moved to one side while being supported by the guide rollers 14, so that the first moving part 5 corresponds to the longest vertical rail 5a. Since the face roller (2a) of the vertically movable pivoting lever (2) is pushed downward, the pivoting lever (2) rotates in one direction from the center axis (1 '), and this pivoting movement is vertically connected to the link bar (2b). By moving the movable tool 7 vertically, the lower fixed blade 12 and the variable blade 13 of the cutting blade coupling sphere 11 is protruded under the mounting plate 1, that is, cutting blade coupling sphere 11 ) Is the vertical movement of.

5 and 6, when the wire 6 is further pulled, the facing roller 3a of the horizontal pivoting lever 3 corresponding to the intermediate length horizontal rail 5b is pushed downward to push the pivoting lever ( 3) rotates the horizontal port 8 connected to the link bar 3b horizontally on the guide 10 as it is rotated about the central axis 1 ', so that the bottom step 8' corresponds to this. Pushing the jaw (11 ') on the cutting blade coupling sphere 11 is made a horizontal movement of the cutting blade coupling sphere 11 on the vertical movement hole (7).

7 and 8, when the wire 6 is fully pulled, the facing roller 4a of the variable blade operating pivot lever 4 corresponding to the shortest length of the variable blade operating rail 5c is lowered. This pivoting lever 4 is pivoted about the central axis 1 'to move the variable blade operating port 9 on the guide 10 connected to the link bar 4b horizontally so that the lower jaw 9' is moved. Pushing the jaw 13 ′ on the variable blade 13 corresponding to this, the variable blade 13 is rotated on the fixed blade 12, the cutting operation is made.

As described above, the operation of the three stages by pulling the wire 6 is performed in a sequential order. Therefore, the fixed blade 12 and the variable blade 13 are moved out of the mounting plate 1 and are laterally moved to finish. When the thread or other sewing material is trimmed, and the force pulling the wire 6 is removed, the fixed blade 12 and the variable blade 13 are reversed by the reverse action by the respective return springs 15. It is horizontally and vertically moved and is loaded into the installation plate 1.

In this way, the present invention does not need to stop the operation of the sewing machine during sewing and can automatically cut the finishing thread or sewing materials without using separate scissors and hands, so that the sewing speed is faster and the sewing efficiency is greatly improved. It works.

Claims (1)

On the central axis 1 'of the side of the mounting plate 1, the pivoting lever 2, the pivoting lever 3 for horizontal movement, and the pivoting lever 4 for variable blade operation are combined in three stages. One end of the rotating lever is connected to the face rollers 2a, 3a and 4a, and the other end is connected to the link bars 2b, 3b and 4b. The face rollers 2a, 3a and 4a are long, medium and short vertical rails 5a, horizontal rails 5b and variable blade rails 5c, respectively. The rails are integrally connected to one side of the movable piece 5 which is moved back and forth by the wire 6, and the vertical bar 7 is provided on the link bars 2b, 3b and 4b, respectively. And a horizontal moving hole 8 on the guide 10, a variable blade operating hole 9, and the like, and a cutting blade coupler 11 having a jaw 11 'upwardly protruded on the vertical moving hole 7 horizontally. It is installed so as to move material, the lower edge of the cutting blade coupling sphere 11 is a fixed blade 12 and the jaw (13 ') is provided with a variable blade 13 is upwardly projected, and the horizontal port (8) and the variable blade At the bottom of the actuating tool 9, the lower jaw 8 'and 9 are respectively protruded downward to correspond to the jaw 11' on the cutting blade coupling tool 11 and the jaw 13 'on the variable blade 13, respectively. Each moving member is guided as guide rollers 14 and is shot as return springs 15. The sewing machine automatically refused (絲 絶) group for which the control configuration.