JP2647247B2 - Method and apparatus for holding cloth of sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for holding a sewing machine, and more particularly, to a method and an apparatus for holding a sewing machine by sewing two sheets of fabric together.

[Conventional technology]

FIG. 7 is a plan view of a needle plate portion of an automatic sewing apparatus that performs seam stitching while superimposing two fabrics and keeping the seam allowance of each fabric constant, and FIG. 8 shows a side view of a part thereof. Reference numerals 1a and 1b denote a cloth end control manipulator for the lower cloth and the upper cloth as disclosed in, for example, JP-A-52-24750, reference numeral 2 denotes a needle drop section, reference numeral 3 denotes a cloth end sensor, reference numeral 4 denotes an upper and lower cloth separation plate,
Is a needle plate, 6 is a fabric, and 7 is a feed dog.

In such a device, when the lower fabric 6a of the two fabrics is inserted into the sewing device, the manipulator 1a for stitch allowance setting for the lower fabric 6a automatically scrapes the fabric 6a and performs a scraping operation. This operation is controlled by the cloth edge sensor 3, and the cloth edge is set at a set position on the needle plate 5. Next, the upper cloth 6b is placed on the lower cloth 6a, the upper cloth 6b is set in the same manner by the upper cloth manipulator 1b, and the cloth presser foot (not shown) is lowered to move the cloth to the needle plate 5. A sandwiching sewing operation is performed with the feed dog 7.

[Problems to be solved by the invention]

However, in the above-mentioned conventional apparatus, when the lower cloth 6a is set and the hand is released from the lower cloth 6a, the lower cloth 6a rotates around the point P in FIG. 7 where the manipulator 1a presses the lower cloth 6a. In a possible state, if any force is applied to the fabric, the position of the needle drop portion may be shifted.

Also, when inserting the upper cloth 6b on the lower cloth 6a, the lower cloth 6a may be dragged and the position may be shifted,
If the sewing machine is sewn by lowering the presser foot of the sewing machine as it is, there is a problem that the seam line 8 is bent and sewn at the sewing start portion as shown in the completed seam line 8 in FIG.

This is because, in the case of an automatic sewing apparatus for keeping the seam allowance width of the seam line 8 constant, as shown in FIG.
This is because the function of keeping the seam allowance constant does not work in front of 1b, that is, between the needle drop portion 2 and the manipulator 1b.

For this reason, it has been troublesome to set the two fabrics, check the alignment of the sewing start portion again, and perform sewing.

Further, when a loading device using a robot or the like is added, this problem becomes more remarkable.

The present invention has been made to eliminate such disadvantages.

[Means for solving the problem]

When the lower cloth is set at a predetermined position of the sewing machine, the lower cloth is pressed by the lower cloth auxiliary presser, the upper cloth is set on the lower cloth, and these two cloths are set by the cloth presser foot. After the material is pressed, the pressing of the lower material by the lower material auxiliary presser is released.

Further, the cloth presser of the sewing machine of the present invention is a lower cloth auxiliary presser which pivotally supports the base end and arranges the free end near the side of the cloth presser foot on the lower cloth set at a predetermined position of the sewing machine. ,
And a mechanism for rotating the lower cloth auxiliary press so that the lower cloth is pressed or released by the free end.

(Operation)

In the sewing machine cloth holding method and apparatus of the present invention, after the lower cloth is set at a predetermined position of the sewing machine, the lower cloth is pressed by the lower cloth auxiliary presser, and the pressing is performed by setting the upper cloth on the lower cloth. After these two fabrics are pressed by the fabric presser foot, they are released.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the present invention, as shown in FIGS. 1 and 2, a lower cloth auxiliary holding mechanism is provided, and the lower cloth end control manipulator 1a is provided.
After the lower cloth 6a is set at a predetermined position of the sewing machine (not shown, similar to FIGS. 7 and 8), the lower cloth 6a is pressed by the lower cloth auxiliary holding mechanism, and the upper cloth 6b is set on the lower cloth 6a. Then, after the cloth presser foot 15 is lowered, the lower cloth auxiliary presser mechanism is separated from the lower cloth 6a.

The lower cloth auxiliary holding mechanism has a first auxiliary table 10 that can be tilted about a support shaft 9, a base end fixed to a lower portion of the first auxiliary table 10, and a free end on the needle plate 5. A spring plate 11 that is opposed to the side of the dough presser foot 15 on the set lower dough 6a, and a second plate that is arranged side by side on the first auxiliary table 10.
Auxiliary table 12, an air cylinder 13 pivotally supported on the second auxiliary table 12 so as to be tiltable, and a piston of the air cylinder 13 supported on an upper part of the first auxiliary table 10 such that the tip thereof is freely tilted. If the air cylinder 13 is urged to extend the piston 14, the first auxiliary table 10
Is rotated clockwise about the support shaft 9 to rotate the spring plate 11
When the piston 14 is retracted, the first auxiliary table 10 rotates counterclockwise as shown in FIG. The free end of 11 is separated upward from the lower fabric 6a.

The sewing machine using the sewing machine presser of the present invention is operated as follows.

First, as shown in FIG. 3, when the lower cloth 6a is inserted into the sewing machine, the lower cloth cloth end control manipulator 1a operates to set the cloth cloth to the set position.

The air cylinder 13 operates and the lower cloth auxiliary holding spring plate 11 holds the lower cloth 6a as shown in FIG.

Next, as shown in FIG. 5, when the upper cloth 6b is inserted into the lower cloth 6a, the upper cloth cloth end control manipulator 1b operates to set the cloth cloth to the set position.

As shown in FIG. 6, the presser foot 15 descends and holds the upper and lower fabrics.

The air cylinder 13 operates, the lower fabric auxiliary presser spring plate 11 returns to its original position, and sewing starts.

〔The invention's effect〕

As described above, according to the sewing machine cloth holding method and apparatus of the present invention, the lower cloth auxiliary holding mechanism holds the lower cloth at the time when the lower cloth end position is set by the cloth edge control manipulator. There is a great advantage that the function of the cloth near the beginning is restricted, and a stable seam line can be obtained without manual correction.

[Brief description of the drawings]

FIG. 1 is a plan view of a lower cloth auxiliary presser mechanism of the sewing machine according to the present invention, FIG. 2 is a front view thereof, FIGS. 3 to 6 are explanatory views of the operation thereof, and FIG. Partial plan view,
FIG. 8 is a side view of a part thereof, and FIG. 9 is an explanatory view of a seam line. 1a, 1b: Manipulator, 2: Needle drop section, 3: Cloth edge sensor, 4: Upper and lower cloth separation plate, 5: Needle plate, 6a ...
... lower cloth, 6b ... upper cloth, 7 ... feed dog, 8 ... seam line, 9 ... support shaft, 10 ... auxiliary table, 11 ... spring plate, 12 ...
Auxiliary stand, 13 ... Air cylinder, 14 ... Piston, 15 ...
… Cloth foot.

Claims (2)

(57) [Claims] The lower cloth is set by a lower cloth auxiliary presser when the lower cloth is set at a predetermined position of the sewing machine, and the upper cloth is set on the lower cloth and these cloths are set by a cloth presser foot.
A cloth presser method for a sewing machine, comprising releasing the press of the lower cloth by the lower cloth auxiliary presser after a plurality of cloths are pressed. 2. A lower fabric auxiliary presser having a base end rotatably supported and a free end disposed near a side surface of a fabric presser foot on a lower fabric set at a predetermined position of a sewing machine; A cloth presser for a sewing machine, comprising: a mechanism for rotating the lower cloth auxiliary presser so as to press or release the cloth.