JPS6234538Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a retraction mechanism for a shirring device in an industrial differential feed sewing machine or the like.

[Conventional technology]

As shown in Figure 2, the cross-sectional side view of the main part, the throat plate NP
In relation to this, there is a main feed dog T1, and a sub feed dog T1 that can increase the feed amount of the work cloth with respect to the main feed dog T1.
2, and a cloth pressing means P for pressing both teeth T1 and T2 from above the work cloth to form pleats.
1. So-called pleats (ruffler) with P2
In a conventional industrial differential feed sewing machine equipped with this device, for example, the mechanism for releasing the pressure on the presser foot and retracting it at the end of the pleating sewing operation is shown in FIGS. 3, 4 and 4, for example. 5
The ones shown in Figures a and b are known. Third
The figure is a cutaway front view of the front main part on the operator side of an industrial sewing machine equipped with a shirring device R, FIG. 5a is a cutaway front view of the back main part of the sewing machine, and FIG. This is a perspective view. In FIG. 3, reference numeral 1 denotes a machine frame of a sewing machine, and a shirring device R is attached to the front side of the machine frame 1. FIG. 4 shows a top perspective view of this shirring device R. P2 is a work holding plate for the sub-feed dog T2, and 2 is its rotation operating shaft, which is rotatably supported by the support frame 3. Reference numeral 4 denotes a lever fixed to the operating shaft, and a presser foot pressure adjustment screw 5 screwed on the support frame 7 causes the presser foot plate P2 to be moved by the compression coil spring 6 to the arrow A shown in FIG. 4 relative to the sub-feed dog T2. biased in the direction. 7 is a pull lever, and pin 8 (third
(Fig.), and is configured so that its end hole can be engaged with a ferrule 11 at the end of a wire 10 of a control cable (Bowden cable, etc.) 9 and rotated upward. In the middle part of this lever 7,
It is provided with a bent portion 12 and abuts and engages with the tip of an actuating lever 13 fixed to the other end of the actuating shaft 2.

Next, in FIG. 5, on the back side of the sewing machine, a presser foot P1 lifting lever 14 for the main feed dog T1 is pivotally mounted on the machine frame 1 by a pin 15, and a presser foot lifting lever 14 is mounted adjacent to the pin 15. A link 16 is attached and connected to a presser foot lifting mechanism (not shown). A chain 19 is connected to the tip hole 17 of the lever 14 via a hook 18.
is connected to a presser foot lifting operation pedal (not shown). A bent portion 14a is provided adjacent to the tip hole 17 of the lever 14, and has a hole that engages with the ferrule 11a at the other end of the wire 10 of the control cable 9, which is the same as that shown in FIG.
20 is a return stopper for the lever 14, and 21 is a bracket attached to the machine frame 1.

Next, the operation will be explained. When the operator steps on the operation pedal (not shown) at the end of the knee stitching work, the lever 14 is pulled down via the chain 19, and the link 16 is pulled, and the presser foot (not shown) is pulled down. The lifting mechanism is activated to raise the presser foot P1. When the rotation of the lever 14 reaches a certain rotation angle, the ferrule 11a of the wire 10 comes into contact with the bent portion 14a of the lever 14 and pulls the wire of the control cable 9 in the direction A in FIG. 5a. This movement is transmitted in the direction A in FIG. Push up the tip and rotate the actuating shaft 2 in the direction of the dotted arrow B in FIG.

[Problem that the invention attempts to solve]

However, in the conventional configuration as described above, the lever ratio of the pulling lever 7 to the operating lever 13 of the operating force of the chain 19 by the operating pedal is such that the force point (ferrule 11) and the point of action are different from the fulcrum (pin 8). (bending portion 12), the ratio was approximately 2:1, and since the operating force of the petal was reduced by only this amount, it had the disadvantage of being quite heavy. This is because the pull-up lever 7 is installed on the front side of the sewing machine, so it is difficult to increase the lever ratio due to space and mechanism limitations. Because of this, the simple aesthetic appearance was spoiled.

This idea was made in view of the above problems, and by arranging a lever mechanism that provides a large lever ratio on the back side of the sewing machine, it is possible to reduce the foot pressure of the presser foot lift operation pedal. The purpose is to reduce the noise and improve the appearance of the front side of the sewing machine aesthetically.

[Means for solving problems]

Therefore, in this invention, on the back side of the sewing machine,
Another lever is provided opposite to the presser foot lifting lever and pivoted to the machine frame, and its tip is engaged with the intermediate portion of the presser foot lifting lever to obtain a large combined lever ratio. By doing so, the above-mentioned problem is solved.

〔Example〕

This invention will be explained below based on examples. FIGS. 1a and 1b and FIG. 6 are diagrams showing an embodiment of the shirring device retraction mechanism according to this invention,
Fig. 1a is a front view of the main part of the back of the sewing machine (corresponding to Fig. 5a of the conventional example), Fig. 1b is a view taken along the line bb, and Fig. 1c is a view taken along the line c-c. , and Figure 6 is
It is a partially cutaway perspective view of the operating lever of the shirring device R (a view corresponding to the right end of FIG. 4 of the prior art example), in which the same (equivalent) components as in the prior art example are denoted by the same reference numerals and redundant explanation will be omitted.

In FIG. 1, reference numeral 14' denotes a presser foot lifting lever, and an oblong hole 24 is bored approximately in the middle of the length of the lever, and a pin 23 is adjustable and fixed in an appropriate position with a nut. In addition, a bracket 21 is fixed to the machine frame 1 in opposition to the pivot pin 15 of the lever 14'.
A pull-up lever L having a pivot pin 22 is disposed on the top thereof, and its tip extends away from the lever 14' toward the machine frame 1 and almost parallel thereto, and corresponds to the oblong hole 24 of the lever 14'. An oblong hole 25 is bored, and the tip of the pin 23 is inserted and engaged therein. Furthermore, a terminal 11b of a wire 10 of the control cable 9 is fixed to a hole approximately in the middle of the length of the pull-up lever L.

The other end of the cable wire 10 is configured to pass through a hole at the tip of the operating lever 13' in FIG. 6, and a ferrule 11 is fixed thereto so as to abut and engage with the hole. The other configurations described above are the same as those of the prior art example.

Next, the operation of this embodiment will be explained. At the end of the pleat sewing work, when a presser foot lifting operation pedal (not shown) is stepped on, the presser foot lifting lever 14' is pushed down via the chain 19, and the presser foot lifting link 16 pulls up the presser foot P1. . Then,
The lever 14' pushes down the pull-up lever L via the pin 23, and connects the wire 10 of the control cable 9 to A by means of the terminal 11b fixed in the intermediate hole.
the actuating lever 13' in FIG.
By lifting the tip of the holder and rotating the operating shaft 2 in the direction of the arrow A, the work presser plate P2 is moved against the force of the biasing spring 6 as in FIG.
Release/evacuate from.

Operation pedal chain 19 in the above operation
The lever ratio for the actuating lever 13' is the force point of the lever 14' against the fulcrum pin 15 (hole 1
7) and the point of action (pin 23), approximately 2:1, and the point of force (pin 23) relative to the fulcrum of lever L (pin 22).
and about 2:1 of the point of application (terminal 11b),
The combined lever ratio is approximately 4:1, which is approximately twice as large as the conventional lever ratio of 2:1, which reduces the pedal operating force and simplifies the mechanism at the front of the sewing machine. This prevents damage to the appearance.

Furthermore, by changing the fixing position of the pin 23 in the oblong hole 24, the composite lever ratio, that is, the amount of reduction in pedal operating force can be adjusted.
Further, a secondary effect is obtained in that the timing of raising the presser foot P1 and the presser plate P2 can be changed.

[Effect of idea]

As explained above using the embodiments, according to this invention, another lever is provided for the presser foot lifting lever on the back of the sewing machine to increase the composite lever ratio. The required operating force can be greatly reduced, and at the same time, the appearance of the front of the sewing machine can be improved.

[Brief explanation of the drawing]

FIGS. 1a, b, and c are a cutaway front view of the main part of the back of a sewing machine of an embodiment of the shirring device evacuation mechanism according to the present invention, and its views taken along the line bb and c-c, and FIG. , Fig. 3 is a cutaway front view of the main part on the front side of a conventional similar sewing machine, Fig. 4 is a top perspective view of the shirring device, Fig. 5a , b are a cutaway front view of the main part of the back of the same sewing machine as above, a view taken along the line b-b, and No. 6, respectively.
This figure is a cutaway perspective view of the operating lever portion in the embodiment shown in FIG. 1. R...Fold removing device, L...Pull lever, P
1... Presser foot, P2... Material presser plate, 1... Sewing machine frame, 11b, 23... Lever center, 14'
... Presser foot lift lever, 15, 22 ... Pivot pin.

Claims (1)

[Scope of utility model registration request] A differential feed sewing machine equipped with a shirring device has a pull-up lever pivotally connected to the machine frame opposite to the pivot point of the presser foot lift lever on the rear side, and the tip of the lever is connected to the presser foot. A shirring device evacuation device for a sewing machine, characterized in that the shirring device is engaged with an intermediate portion of a foot lifting lever to obtain an operation output for releasing/evacuating a cloth presser plate of the shirring device from the intermediate portion of the foot lifting lever. mechanism.