JPS64221Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to an improvement of a cloth holder for a sewing machine.

[Application field of this invention]

The cloth holder of the sewing machine can be used to hold cloth in general sew-stitch sewing machines, etc.

[Prior art]

Patent application filed in 1984 as a cloth holder for conventional sewing machines.
There is No. 158633 (Japanese Unexamined Patent Publication No. 57-81369). This device includes an outer presser frame having a hollow frame, and a plurality of mounting arms each having a lever plate biased in one direction by a spring on the side of the hollow portion of the outer presser. By displacing the plate and working with the external presser,
The positions of the intermediate presser, the outer presser, and the intermediate presser, which hold the fabric between the fabric supports and press and spread it onto the throat plate, can be raised and lowered by operating a lever on an operating arm disposed on the support base. This is how it was done.

[Problems with conventional technology and their technical analysis]

Among these conventional techniques, in Japanese Patent Application No. 55-158633, a lever plate is displaced by the vertical movement of an intermediate presser, and after the fabric is once pressed by the upper and lower pressers, the fabric in the center is spread outward with the lever plate. The structure is such that a presser cloth is stretched over it. Therefore, although the cloth can be stretched reliably, the structure of the entire cloth holder becomes complicated, and the weight of the frame becomes heavy, which is disadvantageous for high speeds. It also has the disadvantage of increasing costs.

[Technical issues]

Therefore, the present invention solves the technical problem of fixing a plurality of leaf springs so as to press the cloth against the lower cloth support while sliding outward from the center of the frame of the upper cloth presser foot. That is.

[Technical means]

The technical means taken to solve the above technical problem is to fix an elastic piece having a spring property radially around the entire circumference to the center of the frame of the upper presser foot. The tip of the elastic piece protrudes from the lower surface of the presser foot, and by the lowering action of the upper presser foot, the tip of the elastic piece slides the fabric while moving outward from the center of the frame of the upper presser foot. is pressed against the lower cloth support.

[Effect of technical means]

The said technical means work as follows. That is, the feed operation arm 3 has a cloth holder attachment part 3' and a presser foot lifting arm 4 that raises and lowers the upper presser foot, and the presser foot lifter arm 4 always presses the upper presser foot 5 downward by spring action. It seems to be working. Now, the presser foot lifting arm 4 is raised manually or by electromagnetic action, the upper presser foot 5 is lifted, and the cloth 9 is sandwiched onto the lower cloth support 6. Then, when the presser arm 4 is lowered, the upper cloth presser foot 5 is lowered and presses the cloth 9 with the tip end 7a of the elastic piece 7, as shown in FIG. Further, when the upper presser foot 5 is lowered by the spring pressure of the presser foot lifting arm 4, the elastic piece 7 is compressed as shown in FIG. In the above cloth 9
is crimped. In this case, as shown in FIG. 6, when the upper presser foot 5 lowers, the elastic piece 7 is
At the same time, the tip 7 of the elastic piece 7
a moves to position 7b. That is, it will move outward by the dimension A. Due to this action, the cloth 9 is horizontally moved outward of the upper presser foot 5 frame due to the frictional resistance of the tip 7a of the elastic piece 7, and the cloth is stretched. At the same time, the cloth 9 is pressed against the lower cloth support 6 by the portion 10 provided on the inner frame of the upper presser foot 5, thereby further tightening the cloth 9.

[Special effects produced by the present invention]

The present invention produces the following unique effects. That is,
When the upper presser foot moves to the lower cloth support and the two move until they sandwich the cloth and come into close contact with each other, the cloth holding section of the elastic piece automatically moves the cloth outward (radially) from the sewing center. Because of this, the fabric can be stretched by simply pinching it, similar to the fabric clamping method used in ordinary cycle sewing machines, so there is no need to pull the fabric each time before pinching it, and it is also possible to tighten thin fabrics. This has the effect that stitches that are conventionally difficult to sew can be easily sewn on thin and knitted fabrics without loosening or wrinkling the fabric. Furthermore, the structure is very simple, and the lower fabric support can be in the form of a thin plate, so there is little gap between the sandwiched fabric and the needle plate or the sewing machine bed, making it extremely sensitive to fabric movement. is stable. Furthermore, the presser foot has an extremely simple structure, is easy to manufacture, is inexpensive, and requires a small number of component parts, so the weight of the cage as a whole is light and can be made very compact. Furthermore, since the elastic pieces are fixed radially around the entire circumference, the cloth is spread out with equal force in all directions, and no cloth will stretch in a particular direction and wrinkle. In addition, since the elastic piece itself has spring properties, the holding force against the fabric can automatically adjust according to the thickness of the fabric, allowing it to achieve the best upholstery condition for any fabric. can be obtained.

〔Example〕

Hereinafter, an embodiment showing a specific example of the descriptive means will be described. Similar to the fabric holder of general cycle sewing machines, a feed operating arm 3 is provided between the arm 1 and the bed 2 of the sewing machine body, and the lower fabric support 6 is attached to the main arm 3.
In addition, the upper presser foot 5 is attached, and a drive device installed inside the sewing machine body moves the needle bar up and down.
It has a structure that can freely operate horizontally in the X-Y directions, and the upper cloth presser foot 5 is always pressed by a spring in the direction of the lower cloth support 6 by the feeding arm 4. A plurality of spaces 5' are provided on the back surface 5'' of the frame for pressing the cloth 9 on the upper presser foot 5, and the frame has elasticity so as to fit into the spaces 5' of the upper presser foot 5. A plurality of elastic pieces 7 each having a cross section are fixed with setscrews 8, and the elastic pieces 7 are
The portion of the cloth holding portion 7a that comes into contact with the cloth is subjected to an uneven surface treatment in order to increase the frictional resistance with the cloth. In addition, in the structure of this embodiment, the upper presser foot has a rectangular shape, but it also has a circular frame,
The same effect can be obtained also when the elastic pieces 7 are attached radially to the outer periphery.

[Brief explanation of the drawing]

Fig. 1 is a front view of the holder of the present invention attached to the sewing machine head, Fig. 2 is a longitudinal sectional view of the main body of the fabric holder of the invention, and Fig. 3 is a view from above of the main body of the fabric holder of the present invention. The plan view, Figure 4, is a partially enlarged vertical cross-sectional view showing the attached state of the elastic piece in the cross section AA of Figure 3, and Figure 5.
The figure is a partially enlarged vertical cross-sectional view showing a state in which the upper presser foot in FIG. 3 is lowered and the elastic piece is in action, and FIG. 6 is an explanatory view of the action of the elastic piece. 5...Top presser foot, 6...Bottom fabric support, 7...
Elastic piece, 9...cloth.

Claims (1)

[Scope of utility model registration request] Sandwich the fabric between the upper presser foot and the lower fabric support,
In the fabric holder of a sewing machine, where a needle through which thread is inserted, the upper presser foot, and the lower cloth support move relative up and down to sew, the machine sews approximately all the way around the center of the frame of the upper presser foot. In addition, an elastic piece having a spring property is fixed in a radial direction, and the elastic piece protrudes from the lower surface of the upper presser foot, and the tip of the elastic piece is moved toward the lower surface of the upper presser foot by the downward action of the upper presser foot. Upper presser foot 5
sliding the cloth 9 while moving outward with respect to the center of the frame so as to press it against the lower cloth support;
Cloth holder for sewing machine.