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sewing machine

A sewing machine and needle technology, which is applied to sewing machine components, sewing equipment, cloth feeding mechanisms, etc., can solve the problems of complex structure, close feeding teeth, and increased number of components.

Active Publication Date: 2017-03-01
JUKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the setting pitch is small, the feed teeth cannot be sufficiently approached, and the remaining end of the suture cannot be sufficiently shortened.
[0014] The thread cutting device described in Patent Document 3 needs to be configured to move both the hooking knife and the cutting knife of the thread cutting device, which leads to a complicated structure and an increase in the number of parts.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Experimental program
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no. 1 approach ］

[0075] Below, based on Figure 1 to Figure 11 , the first embodiment of the present invention will be described in detail. In this embodiment, a needle feed sewing machine will be described as an example of the feed mechanism of the sewing machine. The needle feed sewing machine is the following sewing machine, that is, for thick sewing objects such as slippage in the normal feeding mechanism, which makes it difficult to accurately convey according to the set pitch, and the feed tooth The needle swing of the needle bar is performed synchronously, and the sewing needle can be transported according to the set pitch while the sewing needle penetrates the sewing object.

[0076] Here, in the following description, the direction along the feed direction (arrow F) is defined as the X-axis direction (front-rear direction), and the longitudinal direction of the sewing machine arm 8 perpendicular to the X-axis direction is defined as the Y-axis direction ( left-right direction), and ...

no. 2 approach ］

[0158] In the above-mentioned sewing machine 1, the case where the thread cutting position of the fixed cutter 72 is set on the downstream side in the forward cloth feeding direction with respect to the rotation center position and the rotation range of the sewing needle 13 is exemplified. However, the thread cutting position of the fixed cutter 72 may be set on the upstream side in the forward cloth feeding direction with respect to the rotation center position and the rotation range of the sewing needle 13 .

[0159] Figure 15 and Figure 16 is an operation explanatory diagram in this case, Figure 17 It is an explanatory diagram showing the position change of the feed tooth 44 . Description will be made using these drawings.

[0160] Below, with Figure 9 and Figure 10 The difference between the contents explained in .

[0161] Next, the operation based on the control of the control device 90 will be described.

[0162] In the case of this example, the case where t...

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Abstract

PROBLEM TO BE SOLVED: To reduce the residual end length of a sewing thread after being cut in a sewing machine which performs needle feed.SOLUTION: In a sewing machine 1 which performs cloth feed by a feed dog 44 with a sewing needle 13 moved down and stuck through a workpiece cloth C, a controller 90 controls a feed amount adjustment mechanism such that, while the sewing needle 13 which forms a stitch TL of a final node point is stuck through the workpiece cloth, a feed pitch is set to a minimum pitch Pco capable of being adjusted by the feed amount adjustment mechanism in the normal or reverse cloth feed direction, and the workpiece cloth is fed at the set feed pitch. In addition, the controller 90 controls the feed amount adjustment mechanism such that, while the sewing needle which has been located at a point following the final node point is stuck through the workpiece cloth, a feed pitch is set to a maximum pitch Pmax capable of being adjusted by the feed amount adjustment mechanism in the normal feed direction, and the workpiece cloth is fed at the set feed pitch. During a period of time until a thread is cut after the feed dog which has fed the workpiece cloth at the maximum pitch is separated from the workpiece cloth, the controller 90 controls the feed amount adjustment mechanism such that a feed pitch is set to a maximum pitch capable of being adjusted by the feed amount adjustment mechanism in the reverse cloth feed direction, and the feed dog is moved at the set feed pitch.

Description

technical field [0001] The present invention relates to a sewing machine which shortens the remaining end of thread after thread cutting. Background technique [0002] Existing sewing machines have feed teeth on the lower side of the needle plate, and a thread cutting device for cutting the upper thread and the lower thread is provided on the lower side of the feed teeth. [0003] The feed teeth describe a roughly elliptical trajectory with the major axis along the feed direction and perform rotational motion. When passing through the upper part of the ellipse, the upper end of the feed teeth protrudes from the upper surface of the needle plate, and the cloth can be moved along the specified feed direction. Send direction. [0004] The feed mechanism that applies the above-mentioned rotational motion to the feed teeth can arbitrarily adjust its rotational direction or the width of the feed direction in the trajectory of the rotational motion through the actuator. During the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D05B27/00
CPCD05B19/12D05B65/00
Inventor 门胁真次郎
Owner JUKI CORP