JPS624306Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cloth guiding device for a sewing machine that guides cloth so as to form a straight seam along the cloth feeding direction.

Conventionally, when forming a straight seam as described above, as shown in Japanese Patent Publication No. 56-45639, etc., the direction of the fabric feed through the needle is placed before the sewing machine sewing part in the fabric feed direction. It is known that a guide surface along the cloth feeding direction is provided on one side of the line, and a pressing means is provided to apply rotational moment by pressing the cloth so as to bring the edge of the cloth closer to the guide surface. The conventional method can only be used when forming a seam along a straight edge of the fabric along the fabric feeding direction, and can only be used when sewing fabrics with bent fabric edges or in a straight line in a direction that does not follow the edge of the fabric. When forming eyes, it is difficult to guide the eyes, resulting in a disadvantage that the method becomes unusable.

This invention aims to eliminate the drawbacks of the above-mentioned conventional ones.

An example of this invention will be explained with reference to the drawings.1
2 is a table with a flat top surface, 2 is a sewing machine whose bed surface 2a is placed on the top surface of table 1,
3 is a needle that moves up and down in conjunction with the main shaft of the sewing machine (not shown), and 4 is a needle that faces above the feed dog (not shown) so as to pinch the fabric and transport it in one direction in cooperation with the feed dog (not shown). This is a presser foot that receives downward elastic force.

The cloth guide device 5 will be explained.

Reference numeral 6 denotes a pair of substantially Z-shaped supports 7, 7, which are spaced apart to one side from the cloth feed line through which the needle 3 is passed, and whose lower ends are fixed to the upper surface of the table 1 so as to be spaced apart from each other in the front and rear directions in the cloth feed direction. 8 and 8 are upper flat parts 6a and 6a of both support stands 6, 6 and 6, respectively. These are air cylinders that are individually erected and fixed. 9 stands for the upright portions 7a, 7 of both holding bodies 7, 7.
It is a heavy metal connecting body whose upper end is fitted into the inverted U-shaped gap of a so that it can move up and down, and the upper end is L-shaped so that it faces above the operating rods 8a and 8a of the air cylinders 8 and 8, respectively. The bent engaging portions 9a, 9a are formed to protrude upward, and the lower end portion 9b is inclined so as to be close to the cloth feed line passing through the needle 3. Reference numeral 10 denotes a guide plate made of transparent synthetic resin and having a lower edge formed at a right angle or an acute angle.The acute angle part (guide part) 10a of the guide plate is placed on the cloth feed line passing through the needle 3 when the air cylinders 8, 8 are inactive. The upper end is fixed to the lower end 9b of the connecting body 9 so that it can be engaged with the connecting body 9. Further, as shown in FIG. 3, this guide plate 10 has a guide portion 10
When the leading end S in the cloth feeding direction of a is brought close to the needle drop point P and the leading end of the cloth W to be sewn is positioned at the needle drop point P, the trailing end E in the cloth feeding direction of the guide section 10a is brought close to the needle drop point P. The length l is set so that it is located behind the rear end Q in the cloth feeding direction, that is, it can be pressed to the rear end of the cloth W at the beginning of sewing.

This device has the above-mentioned configuration, and during preparation for sewing, the air cylinders 8, 8 act to raise the operating rods 8a, 8a, and the engaging portion 9a of the connecting body 9
is pushed up to separate the guide portion 10a of the guide plate 10 above the upper surface of the table 1.

The cloth W is arranged as shown in FIG. 3 so that its leading end faces the needle drop point, and the air cylinders 8, 8 become inactive in response to a switch operation by the operator or a cloth detection signal from the cloth detection means. Since the connecting body 9 is made of heavy metal, it descends due to its own weight, and the guide portion 10a falls onto the cloth feed line passing through the needle, thereby clamping the cloth W between it and the upper surface of the table 1. Since the guide portion 10a is formed at an acute angle, it presses the cloth W in a wedge shape, and in this state, it does not generate any lateral acting force such as rotational moment on the cloth W, and the entire width of the cloth W in the cloth feeding direction is Since the pressure is applied in a wedge shape, the pressure is reliable, and the sewing machine is driven in conjunction with pedal operation, etc., and the fabric W is fed by the cooperation of the feed dog and the presser foot 4, and the needle 3 stitches the stitches. is formed, but the cloth W does not shift laterally until the trailing edge Q of the cloth passes the needle drop point. After the sewing is finished, the air cylinders 8, 8 act in conjunction with pedal operation, etc., and the actuating rods 8a, 8a rise to engage the engaging portions 9a, 9 of the connecting body 9.
engage with a and make it follow.

Since the guide body 10 is made of transparent synthetic resin, it is easy to check the condition of the edge of the cloth side.

In this embodiment, when the air cylinder is inactive, the connecting body 9 and the guide plate 10 descend and press due to their own weight, but elastic force may be applied to lower and press. Although the connecting body 9 is made of metal and the guide plate 10 is made of synthetic resin, the materials are not selected.

Further, in this embodiment, the guide plate 10 is arranged obliquely, but as shown in FIG. If it is wide, it can be flat at the bottom.

Furthermore, although an air cylinder is used as the actuating means, other actuating means such as an electromagnet may also be used, and these can be controlled in sequence by the actuating mechanism of the sewing machine or the like.

In addition, in this embodiment, the upper surface 2 of the sewing machine bed
Although a and the top surface of the table 1 are shown on the same plane, one plate may be placed on both top surfaces and the guide plates 10 and 11 may be pressed against the plate.

As described above, according to this invention, the fabric is supported by roughly touching the fabric from the point near the needle drop to the rear edge of the fabric along the fabric feed line that passes through the needle drop point before the sewing machine sewing part in the fabric feed direction. By providing a guide means that can be pressed on the surface, the edge of the fabric does not follow the guide wall as in the past, so it can be used for fabrics with bent edges or in a direction that does not follow the edge of the fabric. Even when a seam is formed in a straight line, the cloth can be guided in a straight line, making the seam neat, improving the quality of the product, and providing versatile cloth guidance.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a sewing machine including the fabric guide device of this embodiment, Fig. 2 is a side view of the fabric guide device, Fig. 3 is an explanatory diagram of the guide plate seen from above, and Fig. 4 is another embodiment. It is an explanatory diagram of an example. In the figure, 10 is a guide plate, and 10a is a guide part.

Claims (1)

[Scope of utility model registration request] On the fabric feed line passing through the needle drop point in front of the sewing machine sewing part in the fabric feed direction, the guide means is capable of substantially line contacting the fabric and pressing it onto the fabric support surface from the point near the needle drop of the fabric to the rear edge of the fabric. , a fabric guide device for a sewing machine that guides the fabric along the fabric feed direction.