JPH0112712Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention consists of a presser metal fitting having a sewing machine needle insertion hole, left and right lower feed teeth that apply a linear feed force to the lower surface of the fabric, and a fabric. The present invention relates to a vertical feed device for a sewing machine, which includes an upper feed dog that applies a linear feed force to the upper surface of the sewing machine.

[Conventional technology]

The third type of vertical feed device for this type of sewing machine is
As shown in FIG. 4, one lower feed dog 50
, the two tooth portions 50a, 50b in the cloth linear feeding direction
It is known that the upper feed tooth 51 is configured to have a wide width that can be engaged with the divided tooth portion 5a located on the upper side in the cloth linear feed direction and the other lower feed tooth 52. There is.

However, when considering sewing work using such a conventional device, for example, when sewing a curved part such as a corner of a cowl, the movement trajectory of the needle is It is necessary to move the fabric so that the curved sewing line of the fabric is located at the top, but at this time,
The fabric is fed by the left and right lower feed dogs and the upper feed dog that straddles both of them, and the positions of these feeding effects are widely dispersed from the center of the curved sewing of the fabric, making it possible to move the fabric smoothly. There was a problem that the curved sewing line could not be moved in any direction, resulting in poor finish on the curved sewing line.

[Problem that the invention attempts to solve]

The purpose of the present invention is to make it possible to beautifully finish curved sewing lines on fabric by simply modifying the upper feed dog.

[Means for solving problems]

The characteristic configuration of the vertical feed device of the sewing machine according to the present invention is that the length of the upper feed dog in the cloth linear feed direction is smaller than that of the lower feed dog, and the upper feed dog is connected to one of the lower feed teeth. It is arranged in such a way that it is only in a polymerized position, and its functions and effects are as follows.

[Effect]

By configuring the length of the upper feed dog to be smaller than that of one of the lower feed dogs, the area of feed action can be reduced, and by positioning this upper feed dog overlapping only one of the lower feed dogs, the number of areas where the feed action can be applied can be reduced. For example, when sewing a curved part of the fabric, even if the curved sewing line of the fabric is positioned on the movement trajectory of the sewing machine needle, the fabric can be moved smoothly with a light force.

[Effect of idea]

Therefore, by making simple improvements such as changing the length and mounting position of the upper feed dog as described above, it is now possible to easily finish the curved sewing line of the fabric while making it easier to manipulate the fabric. Ivy.

In addition, as shown in the examples below, if the upper feed dog is disposed on a line that is perpendicular to the center cloth linear feed direction in the cloth linear feed direction while passing through the sewing machine needle, the upper feed dog Since the center of the tooth is close to the center of curvature of the curved portion of the fabric, the amount of movement of the fabric portion that comes into contact with the upper feed dog is reduced, and there is an advantage that the fabric can be moved smoothly with even lighter force.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the vertical feed device of the sewing machine, which is a hole 1a formed in the throat plate 1 below the throat plate 1 of the cloth table T in conjunction with a well-known downward feed mechanism (not shown).
Left and right lower feed teeth 2A, 2B are provided which apply a linear feed force to the lower surface of the fabric by protruding upward through circular motion through the needle plate 1. a sewing machine needle 4, a presser metal fitting 5 in which a sewing machine needle insertion hole 5a is cut out, and a well-known upper feed mechanism 6.
By protruding downward and circulating in conjunction with the
An upper feed dog 7 is provided to apply a linear feed force to the upper surface of the fabric.

Among the lower feed teeth 2A and 2B, the length of the lower feed dog 2B located on the right side when viewed from the fabric feed direction in the cloth linear feeding direction is determined by the length of the lower feed dog 2A located on the left side.
The length of the lower feed dog 2A on the left side is set to be less than half the length of the
It is arranged on a line that is perpendicular to the sewing machine needle 4 in the cloth linear feed direction, and the lower feed dog 2 on the right side
b is disposed close to the sewing machine needle 4 on the upper side in the cloth linear feeding direction.

The length of the upper feed dog 7 in the cloth linear feed direction is configured to be smaller than that of the lower feed dog 2B on the right side, and the center of the upper feed dog 7 in the cloth linear feed direction is set to It is disposed so as to be located on a line perpendicular to the sewing machine needle 4 with respect to the direction, and to overlap only with the left lower feed dog 2A.

Pressing surface portions 5 on the bottom surface of the presser metal fitting 5 located on both left and right sides of the sewing machine needle insertion notch hole 5a.
Of b and 5c, the pressing surface portion 5b located on the opposite side to the side where the upper feed dog 7 is present, that is, on the right side, is configured to be located above and parallel to the other pressing surface portion 5c. ing.

Then, the length of the upper feed dog 7 is set to the lower feed dog 2A, 2.
Reduction of the feed action area by configuring it to be smaller than b, and reduction of the feed action area by placing the upper feed dog 7 in an overlapping position only with the left lower feed dog 2A,
In addition, by bringing the center of the upper feed dog 7 closer to the center of the curve of the curved portion of the fabric, and by reducing the amount of movement of the fabric that comes into contact with the upper feed dog 7, sewing of the curved portion of the fabric is facilitated. Even when the curved sewing line of the fabric a is positioned on the movement trajectory of the sewing machine needle 4, the fabric can be moved accurately and smoothly with a light force, and the curved sewing line of the fabric can be beautifully finished. This is possible.

In addition, when the above-mentioned step is provided on the bottom surface of the presser metal fitting 5, when sewing the overlapped edges of the fabric, the difference in the thickness of the fabric is absorbed or reduced by the step. Because you can
The dough can be pressed evenly or almost evenly.

In the above-mentioned embodiment, the pressing surface portion 5b of the presser metal fitting 5 was configured to be located above and parallel to the other pressing surface portions 5c, but the pressing surface portion 5c was positioned upwardly toward its lateral outer end. It may be implemented by configuring the tapered surface such that it is positioned.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the vertical feed device for a sewing machine according to the present invention. Figure 1 is a partially cutaway side view, Figure 2 is a plan view, and Figure 3 is a longitudinal sectional front view of the presser fitting. It is. FIGS. 4 and 5 are a partially cutaway side view and a plan view showing a vertical feed device of a conventional sewing machine. 2A, 2B...Lower feed dog, 4...Sewing machine needle, 5
... Presser fitting, 5a ... Sewing machine needle insertion hole, 5
b, 5c...pressing surface portion, 7...upper feed dog.

Claims (1)

[Scope of Claim for Utility Model Registration] Holder metal fitting 5 having a sewing machine needle insertion hole 5a
, left and right lower feed teeth 2A, 2B that apply a linear feed force to the bottom surface of the fabric, and an upper feed dog 7 that applies a linear feed force to the top surface of the fabric.
A vertical feed device for a sewing machine comprising: a length of the upper feed dog 7 in the cloth linear feed direction is configured to be smaller than that of the lower feed dog 2A;
The vertical feed device of the sewing machine is arranged such that the upper feed dog 7 is superimposed only on one lower feed dog 2A. The upper and lower parts of the sewing machine according to claim 1, wherein the center of the upper feed dog 7 in the cloth linear feed direction is disposed on a line perpendicular to the cloth linear feed direction passing through the sewing machine needle 4. Feeding device. Pressing surface portions 5 located on both left and right sides of the sewing machine needle insertion hole 5a on the bottom surface of the presser metal fitting 5.
b, 5c, the pressing surface portion 5b located on the opposite side to the side where the upper feed dog 7 is present is configured such that it is located above the other pressing surface portion 5c. A vertical feed device for a sewing machine set forth in item 1 or 2 of the scope.