JPH088781Y2 - Sewing machine presser foot - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a presser foot of a sewing machine, and more particularly to a presser foot used for sewing a band-shaped cloth body to a side edge of a work cloth.

[Prior Art] Conventionally, a presser foot described in Japanese Utility Model Publication No. Sho 60-21274 has been proposed as a presser foot for a sewing machine suitable for sewing a band-shaped cloth body made of this kind of rubber or the like. In the presser foot, a threaded pin is erected on the presser foot body, and the presser piece is loosely fitted to the pin. Then, the pressing piece is pushed down by the coil spring mounted between the pin and the screwed nut, and the rubber or the like is pressed against the shaft, and the pressing force can be adjusted by rotating the nut. ing.

[Problems to be Solved by the Invention] However, in the conventional presser foot, since the nut is rotated to change the pressing force applied to the band-shaped cloth body, the nut may be changed when the pressing force is changed significantly. However, there is a drawback in that the amount of rotation is extremely large and the operation is complicated. Moreover, it is difficult to grasp the magnitude of the pressing force,
There was a problem that the reproducibility of the pressing force was poor.

[Object of the Invention] The present invention was made to solve the conventional problems, and the object of the present invention described in claim 1 of the utility model is to change the pressing force applied to the strip-shaped cloth body. By using the cam member, the operation member can be operated easily even when the pressing force applied to the strip-shaped cloth body is changed from the minimum pressing force to the maximum pressing force, and the structure is simple and the manufacturing cost is low. It is to provide the presser foot of the sewing machine.

Further, an object of the present invention as set forth in claim 2 of utility model registration is to make it possible to easily recognize the magnitude of the pressing force and to provide a presser foot of the sewing machine having a high reproducibility of the pressing force. It is in.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the presser foot of the sewing machine according to claim 1 is provided with a presser foot main body for pressing the work cloth, A presser foot for sewing a band-shaped cloth on the side edge, which is arranged along the upper surface of the presser foot main body and is located on one surface of the presser foot main body on the work cloth feeding side from the needle drop point. It is composed of a leaf spring attached to the presser foot body so as to be able to press, and is movable over the entire area between the area where the one surface and the leaf spring are most distant and the area where the one surface and the leaf spring are closest to each other, A pressing member configured to apply a pressing force corresponding to the movement position to the belt-shaped cloth body, and a rotatably mounted on the presser foot main body and arranged between the presser foot main body and the pressing member. Operation member and its pressing member A cam surface that acts on the pressing member to adjust the pressing force of the operating member, the cam surface that acts on the pressing member changes in conjunction with the rotation operation of the operating member, and further, the first surface and the pressing member are separated most from each other. Of the first cam surface, the second cam surface which is steeply continuously inclined to the first cam surface and in which the movement amount of the pressing member with respect to the rotation amount of the operation member is large, and the second cam surface is gradually inclined from the second cam surface. And a cam member having a cam surface formed by a third cam surface that is inclined and has a smaller movement amount of the pressing member with respect to the rotation amount of the operation member.

The presser foot of the sewing machine described in claim 2 of the utility model has a cam member formed integrally with it, and a scale indicating the pressing force of the pressing member is displayed, and the cam surface covers a range of 360 degrees or less. The operating member is formed.

[Function] Claim 1 of the utility model registration configured as described above
In the presser foot of the sewing machine described in the item 1, the one surface of the presser foot main body and the pressing member are separated most by the first cam, and the movement amount of the pressing member by the second cam with respect to the rotation amount of the operating member is the operation amount. It is larger than the movement amount of the pressing member by the third cam with respect to the rotation amount of the member. When changing the pressing force of the strip-shaped cloth body pressed by the pressing member against the presser foot main body, the pressing force is changed by the rotation operation of the operation member supported by the presser foot main body.

In the presser foot of the sewing machine described in claim 2 of the utility model registration, the scale of the operating member is 360
The pressing force of the pressing member corresponding to the rotation of less than or equal to the degree can be recognized.

Embodiment An embodiment of the presser foot of the present invention will be described below with reference to the drawings.

In FIG. 1, a presser foot holder 10 is provided at the lower end of a presser bar (not shown) for exchangeably attaching various presser feet, and a presser foot body 12 is detachably attached to the presser holder 10 by a pivot 14. There is. The presser foot main body 12 has its front free end portion 16 inclined upward to facilitate the feeding of the work cloth W. Also, in FIG. 2, the presser foot main body
On the right side of 12 is the space for dropping the sewing needle 18, the movable blade 20 and the fixed blade.
The working space of the cutter is formed by 22.

Then, in the presser foot main body 12 on the feeding side of the work cloth W from the space for dropping the sewing needle 18 and the working space of the cutter,
An opening 24 is provided for feeding the flat rubber Y below the presser foot body 12. The opening 24 is formed by elongating in a direction orthogonal to the feeding direction of the work cloth W, one side of which is open to the outside of the presser foot body 12, and the inside of the other side is flat rubber Y.
It engages with one side edge to position and guide the flat rubber Y.

A leaf spring 26 corresponding to a pressing member is fixed to the front free end portion 16 of the presser foot body 12 by a screw 28. And
The free end of the leaf spring 26 extends into the opening 24, and the flat rubber Y is formed by the elongated inner wall 24a on the left side of the opening 24 in FIG.
It is designed to be pressed and held. Further, a notch 32 for passing a guide protrusion 30a of a guide member 30 described later is provided on one side of the leaf spring 26, and the flat rubber Y is positioned on the opposite side together with the inner surface of the other side of the opening 24. In addition, a protrusion 34 for guiding is provided. Further, a convex portion 26 for engaging with an adjustment dial 36, which will be described later, is provided at substantially the center of the leaf spring 26.
a is provided.

A guide member 30 is rotatably attached to the presser foot main body 12 with a screw 31, and the guide member 30 has an operation protrusion.
The guide protrusion 30a is pressed down by operating 30b
While coming into contact with the presser foot main body 12 from the position retracted from 12, it moves toward the terminal end through the notch 32 of the leaf spring 26, and between the guide protrusion 30a and the protrusion 34 of the leaf spring 26. The interval can be adjusted according to the width of the flat rubber Y.

An adjusting dial 36 corresponding to an operating member is provided between the front free end portion 16 and the leaf spring 26, and a base end portion 38 provided on the lower surface of the adjustment dial 36 is formed in the front free end portion 16 through a hole (not shown). It is rotatably supported by. The cam member 40 is fixedly arranged on the upper surface of the adjustment dial 36. Cam member 40
The cam surface 42 of the first is formed parallel to the adjustment dial 36.
Cam surface 42a, a second cam surface 42b formed so as to be steeply inclined from the first cam surface 42a, and a second cam surface 4a.
The second cam surface 42c is formed so as to be gently inclined from 2b. And the adjustment dial 36
The cam surface 42 changes the engagement position with the convex portion 26a of the leaf spring 26 in accordance with the rotating operation of, and the free end of the leaf spring 26 is separated from the elongated inner wall 24a of the opening 24 or pressed against the elongated inner wall 24a. The holding pressure of the flat rubber Y is adjusted. At this time, as is clear from the drawing, the base end portion 38 is a leaf spring.
Held in the hole by 26. Further, the adjustment dial 36 is provided on its upper surface with a graduation 44 composed of numbers 0 to 4 around the cam member 40, and according to the rotation of the adjustment dial 36, one of the numbers is changed from the leaf spring 26. The exposure is displayed.

Next, in the known overlock sewing machine that forms the overlocking stitch of one needle and three threads, the case where the presser foot of this embodiment is used to sew the flat rubber Y to the work cloth W while extending the flat rubber Y will be described. To do.

First, with the presser foot raised, the worker
The work cloth W is placed on the bed B, the operation protrusion 30b is operated to rotate the guide member 30, and the guide protrusion 30a is pressed to the presser foot main body 12
Evacuate from. Next, the operator rotates the adjustment dial 36 to engage the first cam surface 42a of the cam member 40 and the convex portion 26a of the leaf spring 26, and the free end of the leaf spring 26 is elongated in the opening 24. It is largely separated from the inner wall 24a. Then, as shown in FIG. 1, the flat rubber Y is inserted between the free end of the leaf spring 26 and the elongated inner wall 24a of the opening 24 through one side of the opening 24 which is open to the outside of the presser foot body 12. .

Again, the operator operates the operation protrusion 30b to rotate the guide member 30 to adjust the distance between the guide protrusion 30a and the protrusion 34 of the leaf spring 26. Then, on both side edges of the flat rubber Y, the guide protrusions are formed.
By engaging with 30a and the protrusion 34, the flat rubber Y in the direction orthogonal to the feeding direction of the work cloth W is prevented from floating.

Next, the operator rotates the adjustment dial 36 to change the cam surface 42 that engages with the convex portion 26a of the leaf spring 26. The convex portion 26a of the leaf spring 26 always engages with the second cam surface 42b when engaged with the first cam surface 42a. First cam surface
It disengages from 42a and engages only with the second cam surface 42b. Leaf spring
When the convex portion 26a is engaged with the second cam surface 42b, the convex portion 26 moves toward the elongated inner wall 24a at a large rate with respect to the rotation amount of the adjustment dial 36, and the convex portion 26a has the third convex portion 26a. Cam surface
When engaged with 42c, it moves toward the elongated inner wall 24a at a relatively small rate relative to the amount of rotation of the adjustment dial 36. Then, the holding pressure of the flat rubber Y by the free end of the leaf spring 26 and the slender inner wall of the opening 24 is appropriately adjusted.

Then, when the worker lowers the presser foot and operates the sewing machine to perform sewing, the work cloth W is transferred to the left in FIG. The flat rubber Y is appropriately extended by the free end of the leaf spring 26 and the slender inner wall 24a of the opening 24 without being loosened by the guide projection 30a and the projection 34, while passing through the opening 24 and the work cloth W. It is piled up and transferred to the left. The work cloth W and the flat rubber Y are guided to the dropping point of the sewing needle 18, the edges of the work cloth W are cut and aligned by the cutter, and the flat rubber Y is sewn along the cut edges. .

In this embodiment, a scale 44 made up of numbers 0 to 4 is provided on the upper surface of the adjustment dial 36, and the set flat rubber Y is set.
Since the number corresponding to the holding pressure of No. 3 is exposed and displayed from the leaf spring 26, when the holding pressure of the flat rubber Y that has been set once is changed and then the original set holding pressure is obtained again,
It is not necessary to search for the original holding pressure by trial sewing, and the holding pressure can be set quickly.

Further, in the present embodiment, the cam surface 42 is steeply inclined to the second cam surface 42b, and the third surface is gently inclined.
Since it has the cam surface 42c, it has the following effects. The adjustment dial 36 does not need to be largely rotated to move the tip of the leaf spring 26 from a position largely separated from the elongated inner wall 24a of the opening 24 to a position where the flat rubber Y is started to be gripped, and its operation is easy. . Further, when the tip of the leaf spring 26 moves from the position where it begins to grip the flat rubber Y to the position where it grips the flat rubber Y most strongly, the flat spring 26 is attached to the elongated inner wall 24a with respect to the predetermined rotation amount of the adjustment dial 36. Since it moves toward a relatively small amount, the fine adjustment of the pressure holding force of the flat rubber Y is easy.

[Modification] The present invention is not limited to the embodiments described in detail above, and various modifications can be made without departing from the spirit of the invention. For example, in the present invention, the adjustment dial and the cam member are rotated around an axis line vertical to the leaf spring, but the adjustment dial and the cam member are rotated around an axis line horizontal to the leaf spring. You may make it move.

A cam surface may be formed on the front free end of the presser foot body. Further, the scale may be at the front free end of the presser foot body.

[Advantage of the Invention] As described in detail above, the present invention uses the cam member to change the pressing force of the pressing member against the strip-shaped cloth body, so that the pressing force of the pressing member is changed from the minimum pressing force to the maximum pressing force. Even in the case, it is not necessary to rotate the operation member largely,
The operation of the operation member can be facilitated. Further, since the pressing member is composed of the leaf spring, no special component is required for returning the pressing member to the original position, and the structure is simple and the manufacturing cost is low.

Further, since the strip-shaped cloth body is pressed by the cam member via the pressing member composed of a leaf spring, it is easy to adjust the pressing clamping force and the strip-shaped cloth body passes between the pressing portion and the presser foot main body. Is also smooth and can be easily sewn.

Also, in the presser foot described in claim 2 of the utility model registration, since the scale indicating the pressing force of the pressing member corresponding to the rotation operation of 360 degrees or less is provided, the pressing force once set can be changed. After that, when the original set pressing force is obtained again, it is not necessary to perform trial sewing to search for the original pressing force, and the pressing force can be promptly reproduced and set.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a left side view showing a state in which a flat rubber is sewn to a work cloth by using the presser foot of this embodiment, and FIG. FIG. 3 is a top view of the presser foot shown in the figure, FIG. 3 is an enlarged top view showing the adjustment dial, and FIG. 4 is a side view of the adjustment dial shown in FIG. 12: Presser foot body, 26: Leaf spring, 36: Adjustment dial, 38: Base end,
40: Cam member, 42: Cam surface, W: Work cloth, Y: Flat rubber, 44: Scale

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Shou 59-98874 (JP, U) Seki 60-21274 (JP, U) Seki 60-16373 (JP, Y2) Seki 56- 22867 (JP, Y2)

Claims (2)

[Scope of utility model registration request] 1. A work cloth (W) attached to the lower end of a presser bar.
The work cloth (W) is provided with a presser foot body (12) for pressing.
A presser foot for sewing a band-shaped cloth body (Y) to the side edge of the work cloth, which is arranged along the upper surface of the presser foot body (12) and on which the work cloth (W) is fed from the needle drop point. In the step (1), a plate spring is attached to the presser foot body (12) so as to press the strip-shaped cloth body (Y) against the one surface (24a) of the presser foot body (12). It is possible to move over the entire area between the area where the spring is most distant and the area where the one surface (24a) and the leaf spring are closest to each other, and the pressing force according to the moving position is applied to the strip-shaped cloth (Y). A pressing member (26) configured to apply, rotatably mounted on the presser foot body (12), and arranged between the presser foot body (12) and the pressing member (26). And the pressing force of the pressing member (26) is adjusted. The cam surface (42) that acts on the pressing member (26) to act on the pressing member (26) and that changes in conjunction with the rotating operation of the operating member (36). A first cam surface (42a) that separates the one surface (24a) and the pressing member (26) most, and the operating member (42a) that is rapidly inclined continuously to the first cam surface (42a). The second cam surface (42b) in which the amount of movement of the pressing member (26) with respect to the amount of rotation of the operation member (36) is large, and the operation member (36) is gradually inclined with respect to the second cam surface (42b). Pressing member (2
A presser foot for a sewing machine, wherein a cam surface (42) composed of a third cam surface (42c) having a small movement amount of 6) is formed on the cam member (40). 2. The operating member (36) and the cam member (40)
And the pressing member (2
A presser foot for a sewing machine according to claim 1, wherein a scale (44) indicating the pressing force of 6) is displayed, and the cam surface is formed over a range of 360 degrees or less.