JPH0595480U - Sewing machine feed amount adjusting device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent unnatural wear between the members of the feed amount adjusting device when changing the cloth feed direction in the sewing machine, adjusting the feed pitch, and operating the sewing machine. [Structure] Feed adjusting arm 3 fixed to reverse feed lever shaft 1
And a feed adjusting piece 4 swingably supported at its free end.
And the tip of the feed adjusting screw 4 is screwed into the feed adjusting piece 4, has a stopper portion 8a, and is rotatably supported by the arm 6
And a reverse feed dial 9 screwed onto the arm 6 and slidably engaged with the feed adjusting screw 8 in both the axial direction and the circumferential direction, and the feed adjustment is slidable in the axial direction and fixed in the circumferential direction. Screw 8
The forward feed dial 10 is engaged with the reverse feed dial 9 so as to be brought into contact with and separated from the reverse feed dial 9 and rotatable, and is integrated with the feed adjusting screw 8 when approaching, and the stopper portion 8a is provided between the dials 9 and 10. It is movably located in the formed space.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a feed amount adjusting device for adjusting a feed pitch in a cloth forward feed direction and a reverse forward feed direction in a sewing machine.

[0002]

[Prior Art]

 The conventional feed pitch adjusting device has a structure as shown in FIG. That is, a feed amount setting dial 21 movably supported by the machine frame, a cam body 22 rotatably supported by a shaft 23, and cam surfaces 22a and 22b facing the tip end thereof, and a cam body 22a. The other end of 22 has its upper end pivotally mounted, has a bulge portion 24a in the middle, is connected to the lower end of a feed amount conversion mechanism for changing the feed amount of the feed dog, and is urged upward. 24, an operating arm 25a protruding from a support base, a reverse feed lever 25 whose operation portion side is urged upward by a spring 26, and a shaft 28 rotatably supported, and an upper end of the feed amount setting dial 21. The adjusting arm 29 engages with the end of the threaded portion 21a and the lower end engages with the tip of the operating arm 25a. In this device, in order to reverse feed the feed dog, the reverse feed lever 25 is pushed down by hand. At this time, by the counterclockwise rotation of the reverse feed lever 25 about the shaft 27, the bulging portion 24a is pressed by the operating arm 25a, and thus the operating rod 24 is pressed down against the urging force. When the operating rod 24 is lowered, the cam body 22 rotates clockwise around the shaft 23, and the cam surface 22b comes into contact with the tip of the feed amount setting dial 21 and stops. At this time, the feed amount conversion mechanism connected to the lower end of the operating rod 24 also changes to the reverse feed state. In both forward feed and reverse feed, by rotating the feed amount setting dial 21, the tip end of the dial acts on the cam surface 22a or the cam surface 22b, and the operating rod 24 moves to the lower end. The feed amount conversion mechanism connected changes and the feed pitch can be changed.

[0003]

[Problems to be solved by the device]

 In the above-described sewing machine feed amount adjusting device, since the tip of the feed amount setting dial 21 is in point contact with the cam surface 22a or 22b of the cam body 22, the feed direction is changed, the sewing machine is operated, or the feed pitch is adjusted. There is a possibility that shock and vibration will occur and both contact parts will be worn, resulting in a feed pitch error or an inoperable state. There is also known a feed pitch adjusting device in which the cam body is divided into a forward feed type and a reverse feed type, and a forward feed dial and a reverse feed dial are provided correspondingly, respectively. However, since the tips of the dials are similarly in point contact or line contact on the surface of each cam, the points where both contact portions are worn are the same.

An object of the present invention is to provide a feed amount adjusting device in which unnatural wear does not occur between members when the feed direction is changed in the sewing machine, the sewing machine is operated, or the feed pitch is adjusted.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a feed amount adjusting device of a sewing machine of the present invention comprises a feed adjusting arm fixed to a reverse feed lever shaft, a feed adjusting piece swingably supported at its free end, and a tip. Part is screwed to the feed adjustment piece and has a stopper part, and the feed adjustment screw is rotatably supported by the arm and the feed adjustment screw is screwed to the arm and is slidable both axially and circumferentially. The reverse feed dial is engaged with the reverse feed dial, is slidable in the axial direction, and engages the feed adjustment screw in a fixed state in the circumferential direction. It sometimes consists of a forward feed dial integrated with the feed adjusting screw, and the stopper portion is movably positioned in the space formed between the dials.

[0006]

[Work]

 In the sewing machine feed amount adjusting device configured as described above, when the forward feed dial is lightly pressed and only the forward feed dial is rotated, the operating angle of the reverse feed lever shaft to the forward feed side changes, and Only the pitch is adjusted. When only the reverse feed dial is rotated, the clearance of the internal stopper is adjusted, the operating angle of the reverse feed lever shaft to the reverse feed side is changed, and only the reverse feed pitch is adjusted. Furthermore, when the forward feed dial is pressed firmly to engage the feed adjusting screw and the forward feed dial and both dials are rotated together, the operating angle of the reverse feed lever shaft toward the forward feed side and the operating angle toward the reverse feed side are increased. Changes, and the forward and reverse feed pitches are adjusted by the same amount.

[0007]

【Example】

 The feed amount adjusting device for a sewing machine according to the present invention will be described with reference to FIGS.

This feed amount adjusting device is generally composed of a feed adjusting arm 3 fixed so as to hold a reverse feed lever shaft 1 to which a feed converting lever 2 is fixed, and a forked portion formed at its free end. The feed adjusting piece 4 is swingably supported by a fixed shaft 5 between the portions 3a, and the front end portion is screwed into the feed adjusting piece 4, and the intermediate portion is supported by the arm 6 via the feed converting boss 7. The feed adjusting screw 8 and the reverse feed dial 9 which engages with the feed adjusting screw 8 in the axial direction and the circumferential direction in a sliding manner and is screwed to the feed converting boss 7, and the feed adjusting screw 8. The forward feed dial 10 is slidable in the axial direction and fixedly engaged in the circumferential direction.

In addition to the feed conversion lever 2 and the feed adjusting arm 3, the reverse feed lever shaft 1 has an operating rod 12 which is a part of a feed amount conversion mechanism for converting the feed amount of the feed dog via the feed arm 11. Has been installed. The reverse feed lever shaft 1 is urged in the direction of the arrow by the tension springs 13 and 14 having one end hooked on the frame. Therefore, the forked portion 3a side of the adjustment arm 3 is biased toward the front side, and the operation portion of the feed conversion lever 2 is biased upward.

The centers of the feed adjusting piece 4 and the fixed shafts 5 are located on a straight line.

The feed adjusting screw 8 is supported by the feed converting boss 7 via an O-ring 19. A stopper 20 is fixed to the feed adjusting screw 8, and a cushion rubber 30 is interposed between the feed conversion boss 7 and the stopper 20. Therefore, when the forward feed dial 10 is operated and a rotational force is applied to the feed adjusting screw 8, a slip occurs between the O-ring 19 and the cushion rubber 30, and the feed adjusting screw 8 is attached to the feed converting boss 7. Rotate against. In addition, the feed conversion boss 7 is provided with a lock pin 31 that prevents the stopper 20 from naturally rotating, that is, the feed adjusting screw 8 from rotating naturally.

Further, a flange-shaped internal stopper portion 8 a having a large diameter is formed in a portion of the feed adjusting screw 8 located between the reverse feed dial 9 and the normal feed dial 10. The stopper portion 8a serves as a stopper when the feed conversion lever 2 is operated to swing the feed adjusting arm 3 around the reverse feed lever shaft 1 to change the feed direction. The gap A between the stopper portion 8a and the facing surface of the reverse feed dial 9 is the swingable range of the feed adjusting arm 3. This gap A can be adjusted by rotating the reverse feed dial 9 and moving it with respect to the feed conversion boss 7. When the gap A changes, the swing angle of the feed adjusting arm 3 to the reverse feed side, that is, the operation angle β of the reverse feed lever shaft 1 to the reverse feed side changes, and the reverse feed pitch changes. When the feed conversion lever 2 is operated, the internal stopper portion 8a and the reverse feed dial 9 collide with each other at their facing surfaces, so that partial wear does not occur unlike the conventional one. Since the operating angle of the reverse feed lever shaft 1 is small, if the distance L between the centers of the reverse feed lever shaft 1 and the fixed shaft 5 is lengthened, the movement locus of the feed adjusting screw 8 becomes almost a straight line. There is no reason for it.

The feed conversion boss 7 is provided with a lock pin 15 for preventing natural rotation of the reverse feed dial 9, and the reverse feed dial 9 has a lock pin 16 for preventing natural rotation of the forward feed dial 10. Is provided. The lock pins 31, 15, and 16 are provided in a predetermined manner with respect to the stopper 20 for the feed conversion boss 7, the reverse feed dial 9 for the conversion boss 7, and the forward feed dial 10 for the reverse feed dial 9, respectively. It is spring-biased so that it is fixed on the pitch.

The forward feed dial 10 is located on the upper surface of the reverse feed dial 9 via a spring 17. A reverse feed dial lid 18 is fixed to the reverse feed dial 9, while the forward feed dial 10 is provided with a collar portion 10a. When the collar portion 10a is engaged with the reverse feed dial lid 18, the reverse feed dial 9 and the forward feed dial 10 are integrated, and the reverse feed dial 9 is prevented from popping out.

Knurled lateral or diagonal notches are formed on the facing surfaces 8 b, 10 b of the feed adjusting screw 8 and the forward feed dial 10, respectively, and are normally separated by the force of the spring 17.

In the sewing machine feed amount adjusting device having the above-described configuration, when the forward feed dial 10 is lightly pushed to separate the collar portion 10a from the reverse feed dial cover 18, and only the forward feed dial 10 is rotated, the fixed shaft is rotated. The distance of the shaft center of 5 to the arm 6, that is, the operation angle α of the reverse feed lever shaft 1 toward the forward feed side changes, and only the forward feed pitch is adjusted. When only the reverse feed dial 9 is rotated, the clearance A of the internal stopper is adjusted, the operating angle β of the reverse feed lever shaft 1 to the reverse feed side is changed, and only the reverse feed pitch is adjusted. Further, when the forward feed dial 10 is strongly pushed to connect the feed adjusting screw 8 and the knurled portions of the facing surfaces 8b and 10b of the forward feed dial 10 and the forward feed dial 10 is rotated together with the reverse feed dial 9, The operation angle α to the forward feed side and the operation angle β to the reverse feed side of the feed lever shaft 1 change, and the forward feed pitch and the reverse feed pitch are adjusted by the same amount. The return side is returned by the tension springs 13 and 14 as in the conventional one.

[0017]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

That is, there is no occurrence of involuntary wear between members associated with cloth feed direction conversion, feed pitch adjustment, and sewing machine operation. Therefore, unlike the conventional one, a pitch error does not occur and the operation cannot be disabled. Also, it is convenient because the reverse feed pitch and the forward feed pitch can be adjusted with one dial. In addition to that, fine adjustment of the pitch at the time of reverse feed is also possible, and adjustment of only the reverse feed pitch can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view of a feed amount adjusting device of the present invention excluding each feed dial portion.

FIG. 2 is a bottom view in which the dial portion of the feed amount adjusting device of the present invention is cut away.

FIG. 3 is a right side view of the feed amount adjusting device of the present invention shown in FIG.

FIG. 4 is a cross-sectional view of a conventional feed amount adjusting device.

[Explanation of symbols]

 1 Reverse feed lever shaft 2 Feed conversion lever 3 Feed adjusting arm 4 Feed adjusting piece 6 Arm 8 Feed adjusting screw 8a Internal stopper 9 Reverse feed dial 10 Forward feed dial

Claims (1)

[Scope of utility model registration request] 1. A feed adjusting arm fixed to a reverse feed lever shaft, and a feed adjusting piece swingably supported at a free end thereof.
A feed adjustment screw that has a stopper that is rotatably supported by the arm and has a tip end screwed with it, and a screw that engages with the arm and that engages with the feed adjustment screw slidably in both the axial and circumferential directions. The feed dial is slidable in the axial direction and is engaged with the feed adjusting screw in a fixed state in the circumferential direction, and is integrated with the reverse feed dial so that it can move in and out of contact with the reverse feed dial. A feed amount adjusting device for a sewing machine, which comprises a feed dial, and the stopper portion is movably positioned in a space formed between the dials.