JPH0580239B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a pattern cam selection device for a sewing machine.

[Field of application of the invention]

The pattern cam selection device of the sewing machine described above can be used not only for home sewing machines but also for embroidery sewing machines and the like.

[Prior art]

A conventional pattern cam selection device for a sewing machine is disclosed in Japanese Patent Publication No. 57-49235. In this device, when the pattern cam is rotated, the follower is detached from the pattern cam and moved to a desired outer circumference of the pattern cam.

[Problems in the prior art and their technical analysis] In the pattern cam selection device of this conventional sewing machine, in order to select a pattern, it is necessary to pre-rotate the dial to maintain release and then rotate the dial further. However, the structure was very complicated, and furthermore, it was necessary to press a release button before starting sewing.

[Technical issues]

Therefore, the technical object of the present invention is to make it possible to disengage the follower from the pattern cam by operating the presser foot lifting lever.

[Technical means]

The technical means taken to solve the above-mentioned technical problem is to operate a detachment means by operating a presser lever, to detach the follower from the pattern cam by the detachment means, and to mechanically remove the follower. By means of selection,
It is possible to select any pattern cam.

[Effect of technical means]

When the presser foot lifting lever 2 is rotated in the direction of the arrow,
The detachment cam 3 pushes the detachment cover 4, and the follower 10 rotates a predetermined amount through the detachment rod 5, detachment arm 13, and extension drive arm 11, and the follower cam contact finger 10A
completely separates from the maximum diameter portion of the pattern cam 9. At this point, the detachment operation of the follower 10 is completed.

In the next selection operation, although not shown, an arbitrary pattern is selected by moving the follower 10 in the axial direction of the pattern cam 9 by an external operation.

When sewing, never presser foot lifter lever 2.
is operated to lower the presser foot and start work, so the follower 10 comes into contact with the pattern cam 9, and the follower swings according to the ups and downs of the pattern cam 9, and the width drive arm 11, width adjuster 14, Although not shown, the needle bar is swung through the width rod 15 to sew a predetermined pattern.

[Special effects produced by the present invention]

The present invention produces the following unique effects. In other words, (1) Conventionally, there is a method of automatically releasing the release of the sewing machine by rotating the sewing machine to avoid fools, but due to the structure, one or two stitches are sewn at the needle position in the release state, which is an unavoidable serious situation. There were flaws. However, in the present invention, since the presser foot is always lowered during sewing, such drawbacks are completely eliminated.

(2) The dial operation is extremely light because it does not perform a detachment operation, but only a cam selection operation.

(3) The release operation is linked to the presser foot lifting operation, which is always performed during sewing, so no extra operations are required.

(4) The presser foot lifting lever is long enough for the release operation, so the operating force is not large.

〔Example〕

Hereinafter, an example showing a specific example of the above technical means will be described. As shown in the figure, sewing machine frame 1
A presser foot lifting lever 2 is rotatably attached to the jaws of the presser foot, a release cam 3 is provided at the rotation center shaft of the presser foot lifting lever, one end of the release lever 4 is brought into contact with the outer peripheral surface of the release lever, and the release lever 4 is brought into contact with the outer peripheral surface of the release lever. The center part of the release lever is swingably attached to the sewing machine frame 1, the other end is rotatably attached to one end of the release rod 5, and the other end of the release rod 5 is connected to the release arm 13. The detachable arm 13 is fitted on a follower shaft 12 fixed to the sewing machine frame 1, and the other end is attached to the follower shaft 12.
The leading edge of the follower 10 is engaged with the outer circumference of the pattern cam 9 by the follower cam contact finger 10A. The pattern cam 9 is rotated by a worm 7 attached to the main shaft 6 of the sewing machine. Further, the opening angle of the detachment arm 13 and the width driving arm 11 can be adjusted, and a width adjusting device is attached to the tip of the width driving arm 11.
It is fitted so that it can swing freely.

[Brief explanation of the drawing]

The drawing is a three-dimensional front view of the main parts of an embodiment of the present invention. 1... Sewing machine frame, 2... Presser foot lifting lever, 9
... Pattern cam, 10 ... Follower.

Claims (1)

[Claims] 1. A presser foot lifting lever that is operated from outside the sewing machine frame to raise or lower the presser foot, a plurality of pattern cams that rotate in conjunction with the main shaft of the sewing machine, and a plurality of pattern cams that are provided so as to be in contact with the pattern cams. In the sewing machine, the sewing machine includes a follower, a mechanical detachment means for disengaging the follower from the pattern cam, and a mechanical selection means for arbitrarily moving the follower in the axial direction of the pattern cam. activating the detachment means by operating a raising lever, and causing the detachment means to detach the follower from the pattern cam;
A pattern cam selection device for a sewing machine, wherein the follower is caused to select an arbitrary pattern cam by the mechanical means.