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Sewing machine

A technology for sewing machines and electric motors, which is applied in the direction of sewing machine components, sewing equipment, sewing machine ring mechanism, etc., which can solve the problems of easy weakening of upper suture thread tension, lower sewing quality, and poor balance of lower suture thread tension, etc. Occurrence of tangle stitches and improvement of sewing quality

Active Publication Date: 2015-04-22
JUKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, as entanglement stitches, there are following problems, that is, the tension of the upper thread tends to be weakened, the balance of the tension of the lower thread is poor, and adverse effects such as seam slack tend to occur, which easily leads to a decline in sewing quality.

Method used

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Experimental program
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no. 1 Embodiment approach

[0076] based on Figure 1 ~ Figure 3 , and the first embodiment of the present invention will be described.

[0077] As this embodiment, the sewing machine 100 described below is a so-called electronic cycle sewing machine, which has a holding frame as a cloth holding part, holds the cloth to be sewn, and moves relative to the sewing needle by the holding frame. Thereby, a sewing pattern based on predetermined sewing data is formed on the cloth held by the holding frame.

[0078] Here, the direction in which the sewing needle 11 described later moves up and down is defined as the Z-axis direction (up-and-down direction), and a direction perpendicular thereto is defined as the X-axis direction (left-right direction), and the Z-axis direction and the X-axis Direction The direction in which these two are orthogonal is defined as the Y-axis direction (front-rear direction).

[0079] The above-mentioned sewing machine 100 mainly includes: a needle bar 12 that holds the sewing nee...

no. 2 Embodiment approach

[0163] Based on attached Figure 14 ~ Figure 22 , and the second embodiment of the present invention will be described.

[0164] The sewing machine 100A of the second embodiment is mainly different from the above-mentioned sewing machine 100 in that the tank 13A is a vertical tank, that is, a semicircular rotary tank, and that the differential transmission mechanism 40A uses a differential transmission belt instead of a differential gear mechanism. As for the mechanism, other structures having the same functions are assigned the same reference numerals, and repeated explanations are omitted. In addition, the structure which is not mentioned in the following description of 100 A of sewing machines is considered to have the same structure as the sewing machine 100.

[0165] (kettle and differential transmission mechanism)

[0166] based on Figure 14 to Figure 21 , the tank 13A and the differential transmission mechanism 40A will be described.

[0167] Such as Figure 20 , ...

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Abstract

The invention relates to a sewing machine (100) configured to avoid a hitch stitch. The sewing machine (100) includes a rotation base (43) rotatable about a center line (C) of a needle bar (12), a rotation drive motor (463), and a differential transmission mechanism (40) including an input shaft (41) coupled to a sewing machine motor (21) and an output shaft (42) coupled to a shuttle (13). The differential transmission mechanism (40, 40A) is configured such that a phase difference between the input shaft (41) and the output shaft (42) is adjustable. The input shaft (41) and the output shaft (42) are aligned on the center line (C) of the needle bar (12). The differential transmission mechanism (40) includes a support frame (441) rotatable around the input shaft (41) and the output shaft (42), a transmission member (445) rotatably supported by the support frame (441) and transmits a rotating force between the input shaft (41) and the output shaft (42) such that a rotation direction is reversed, a first driven member (461) provided on the support frame (441), a second driven member (462) provided on the rotation base (43), a first driver member (464) providing a rotating force to the first driven member (461), and a second driver member (465) providing a rotating force to the second driven member (462). An amount of a rotation transmission from the first driver member (464) to the first driven member (461) is half an amount of a rotation transmission from the second driver member (465) to the second driven member (462). The first driver member (464) and the second driver member (465) are provided on the same shaft in a fixed manner such that they rotate simultaneously.

Description

technical field [0001] The present invention relates to a sewing machine for realizing ideal stitches. Background technique [0002] In seams formed by sewing machines, there are seams such as Figure 24 As shown in (A), the ideal stitch formed by winding the upper suture and the lower suture in a uniform state, and as shown in Figure 24 As shown in (B), a hitch stitch is formed in such a manner that only the upper suture exhibits a helix. [0003] As an ideal stitch, the tension of the upper thread and the tension of the lower thread act on the fabric in good balance with each other to form a good seam and provide a sewn product with high sewing quality. On the other hand, as entanglement stitches, there are following problems, that is, the tension of the upper thread is easily weakened, the balance of the tension of the lower thread is poor, and adverse effects such as seam slack are likely to occur, which easily leads to a decline in sewing quality. [0004] As one of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D05B57/30D05B27/00
CPCD05B69/02D05B57/146D05B57/143A47J27/05A47J27/084A47J27/13A47J36/04
Inventor 月冈高志公文哲柳泽理人
Owner JUKI CORP
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