JPS6182788A - Cloth press pressure regulation mechanism of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a presser foot pressure adjustment mechanism for a presser foot of a sewing machine.

[Conventional technology]

In a conventional sewing machine, for example, an industrial lockstitch sewing machine, there is a presser foot full lifting device.
The presser foot 3 is pressed against the throat plate 2 by the presser spring 1.
The knee lift lever I is activated by the solenoid 4 energized by the knee operation switch 6 embedded in the knee rest member 5.
, a presser rod 9 disposed in the oil sump 8. Salary 10. Lever 11
, 13, and a locking rod 15 fixed to the presser foot 14 via the connecting rod 12 is pulled up to raise the presser foot 3 relative to the throat plate 2.

However, in the conventional device as described above, the operating force required by the operator to raise the presser foot 3 is reduced by the strain/id 4, but the fixed position of the presser foot 3 is at the lowest position where it contacts the throat plate 2. and the highest position on the throat plate determined by the stroke of Sobi/Ide 4. Therefore, for example, when the fabric to be sewn is thick, or to facilitate fabric positioning and operation, had the disadvantage that it was not possible to raise the presser foot to an appropriate intermediate position.

In order to eliminate the above-mentioned drawbacks, for example, pcT application number / JP84100140r sewing machine presser foot),
Figure 3 shows a cross-sectional view of this part.The details of acid resistance are shown in the cited document above, so a detailed explanation of the installation will be omitted. However, this device has a pressurizing force reduction mechanism that reduces the spring force of the spring means 112 that urges the presser foot 100 at the lower end of the presser foot 102, which is supported by a bearing 104 on the sewing machine frame 103, toward the throat plate 101. 200, a presser foot mechanism m300 for lifting the presser foot 100, and an operating device +540G operated by the operator, and the spring means 102 is composed of a presser spring 105 and an auxiliary spring 106.

To explain the outline of the operation, when the worker's knee is placed on the knee rest member 406, the f111 and operation lever 401 rotate slightly to the right against the torsion coil spring 405, and the limit switch 4 (12 By rotating counterclockwise to move away from the lower surface of the oil pan 305 and closing the contacts, the rotary linenoid 204 is urged and rotated in the direction of the arrow, and the drive arm 203, connecting rod 2o8.bell crank 2o7. The arm 21 (1” iM
The upper arm 205α of the shaped member 205 is moved upward #f, and the pressing spring 105 is held upward together with the annular plate 110 against its elastic force, thereby causing the pressing spring 105 to move fEka. The elastic force of this γ presser spring 105 does not act on the presser foot 102 (
Thus, only the force of the auxiliary spring 106 acts on the presser foot 102.

Furthermore, when the operating lever 401 is rotated counterclockwise, the presser rod 306 moves upward, and the connecting rod 3081, bell crank 304. Connecting rod 301. Bell crank 303.
The horizontal lever 3 is moved by the arm 310 via the presser keyaki rising lever 302.
(11 is raised against the spring force of the auxiliary spring 106, and the presser foot ml02 is raised. Therefore, the presser foot 100 is raised.

As described above, since the lifting of the presser foot 100 only requires resistance to the relatively weak auxiliary spring 106, the operating force required by the knee is small. It has become relatively stable (can now be maintained).

[Problem that the invention seeks to solve]

However, in the cited example above, the above-mentioned effects (can be obtained), but the function of the auxiliary spring 106 is originally to reduce the presser foot lifting operation force, and also to reduce the This is to reduce the pressure of the presser foot in order to facilitate positioning operations, etc., and the spring constant is constant, M is set as small as possible, and it is linked with the khy mechanism of the presser spring. I wasn't able to overcome the pressure level to the extent that I could send regular memories.

For this reason, in this invention, the auxiliary spring pressure can be easily adjusted from the outside, and the second presser foot pressure is provided while maintaining the characteristics of the cited example, so that the 911 foot can be sewn with a curve. The purpose of this product is to create a webbing that can be used to sew the stepped portions of soft materials such as knits by hand, making it easier to feed the stepped portions.

[Means for solving problems]

For this reason, in the present invention, the auxiliary spring is configured to be externally accessible by an auxiliary spring adjustment screw screwed through the axis of the pressing spring member qhj.

〔Example〕

The present invention will be explained below based on examples.

Fig. 1 is a cross-sectional view of a main part of an embodiment of the presser foot pressure V @ knot mechanism according to the present invention, and in order to correspond to Fig. 3 of the cited example, the same or equivalent components as in Fig. 3 are denoted by the same reference numerals. is shown using λ, and the double explanation of λ is omitted.

The presser foot 102, which has the presser foot 100 at its lower part, has a third
As shown in the figure, it is supported by a bearing 104 on the sewing machine 7 frame 103 so as to be able to move freely in oil, and the force can be adjusted by a spring means 112 consisting of a pressing spring 105 and an auxiliary spring 106.

The auxiliary spring 106 is disposed in a concave hole on the horizontal rod 301 of the presser foot 1 (12), and is connected to the adjustment J screw member 1 via the ball B.
Auxiliary spring screwed through the axis of 09 = t = screw S
The elastic force can be adjusted by adjusting the structure. N is a lock nut. f+li help spring 10
The spring bi of No. 6 is determined by the above quotation u by the above y@reduced screw S.
From the purpose of reducing the presser foot lifting operation force lK and fi, a value that can be set within the desired range suitable for the second presser foot pressure is selected.

As mentioned above, the configuration of this embodiment is basically the same as the above-mentioned cited example (Fig. 3), except for the part of the above-mentioned auxiliary spring. Although the explanation will be omitted, since the operator can easily adjust the auxiliary spring 106 to the desired range from the outside, the above-mentioned purpose can be achieved.

[Effect of light]

As described above, according to the present invention, since the auxiliary spring is configured to be independently adjustable from the outside, it is possible to reduce the operating force for fully raising the presser foot, and to provide the second presser foot within a desired range. It has become possible to extremely simplify various process operations such as sewing thick fabrics, stepped sections of soft M-sewn items, or sewing curves.

4. A simple explanation of section 115. Figure 1 is a self-cut diagram of an example of the presser foot pressure adjustment according to the present invention, and Figure 2 is a diagram of a lockstitch machine for use with a stand and rice mill.
FIG. 3 is a sectional view of a presser foot lifting bag as an example of a conventional improvement proposal.

100... Presser foot position 101... Needle plate 102
... Presser foot 103 ... Sewing machine 7 reams 10
5- Pressing spring 106... Auxiliary spring 109... Adjustment screw member 112... Spring means S... Auxiliary spring adjustment screw N... Lock nut

Claims (1)

[Claims] In a sewing machine having a spring means for a presser foot consisting of a presser spring and an auxiliary spring, the elastic force of the auxiliary spring can be adjusted independently from the outside by an adjustment screw threaded through an adjustment member of the presser spring. A presser foot pressure adjustment mechanism for a sewing machine, characterized in that it is configured as follows.