JPS6137428Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a sewing machine in which operating sections such as a plurality of pattern selection buttons, an automatic reverse stitch switching button, and a plurality of buttonhole selection buttons for sewing buttonholes are arranged in parallel. This invention relates to an interlock device.

In the case of such a sewing machine, when performing pattern stitching that combines normal zigzag stitching with automatic backward stitching, if an operating section such as a buttonhole selection button is pressed by mistake, the desired pattern cannot be sewn. The same applies to the opposite case.

This idea solves the above problems,
When performing pattern sewing that includes automatic backward sewing in addition to normal pattern sewing, or vice versa, use an interlock device that prevents buttons such as the buttonhole selection button or automatic backward sewing changeover button from being pressed. This is what we provide.

Embodiments of this invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, 1 is an upper shaft rotatably mounted within a sewing machine arm 2, and 3 is a camshaft that rotates in conjunction with this upper shaft 1. This cam shaft 3 has a plurality of pattern cams 4, a left-side narrow zigzag buttonhole cam 5 that sews the left side of the buttonhole, and a buttonhole that sews the buttonhole with the largest width zigzag stitch. The cam 6 and the buttonhole cam 7 for right-side narrow zigzag stitching for sewing the right side of the buttonhole are fixed.

In addition, a cam 8 for controlling cloth feed, which is used when sewing a zigzag pattern with automatic backward sewing, is provided at the front of the cam shaft 3 so as to be able to move forward and backward, and a spring (not shown) moves this cam 8 backward. Press.

Reference numeral 10 in FIG. 3 is a push lever that moves the cam 8 back and forth, and its lower end is swingably attached to the arm 2 via a shaft 9. make contact with the rear side of the

Reference numeral 12 in FIG. 3 denotes an elevating and lowering rocking plate, and an automatic reverse sewing switching button 13 is provided at its upper end, and the lower end of the rocking plate 12 is connected to the front end of the lever 10 by a shaft 14.

Reference numeral 15 in FIG. 3 is a fixed plate fixed inside the arm 2, and this fixed plate 1 is located on the rear side of the upper part of the swing plate 12.
Upper and lower engaging portions 16 and 17 are provided on the front edge of the swing plate 12, and the swing plate 12 is provided with a spring that provides elasticity toward the rear.

Reference numeral 18 in FIGS. 3 and 4 is a cam contactor that swings in contact with the cam 8. A part of the cam contactor is attached to the arm 2 by a shaft 19, and a swinging body 20 is attached to the contactor 18.
is fixed. This rocking body 20 is interlocked with a cloth feed adjustment box (not shown) by an interlocking mechanism (not shown).

Reference numeral 21 in Fig. 1 indicates three buttonhole selection buttons, and each of these buttons 21 corresponds to Fig. 3 and 4, respectively.
It is fixed to the tip of a selection lever 22 shaped as shown in the figure. The rear ends of these levers 22 are swingably attached to the arm 2 via a horizontal shaft 23.

Further, the upper end of a push rod 24 is connected to the front of each lever 22 by a shaft 25, and an arm 26 is integrally provided at the lower rear end of the lever 22.

Reference numeral 27 denotes a selection plate whose upper ends on both sides of the forward facing pieces are rotatably supported by the shaft 23, and at the front of its lower end there is a receiving part 28 with which the rear side of the lower end of the arm 26 of each lever 22 comes into contact. Each arm 26 is provided in different steps.

29 is a limiting plate, and the lower ends of left and right legs 30 extending downward from both sides thereof are swingably attached to the shaft 19. As is clear from FIG. 2, the limiting plate 29 faces the upper front side of the cam 8 and has a spring 40 that is pressed against the front surface of the cam 8.

Further, the push rod 24 is bent forward from the middle as shown in FIGS. 3 and 4, and a downward abutting portion 31 and a rearward abutting portion 32 are formed at the rear end of this bent portion, These contact parts 31 and 32 are shown in FIGS. 3 and 4.
This corresponds to the upper end or front end of the limiting plate 29 as shown in the figure.

Reference numeral 33 denotes three recesses formed at appropriate depths from the upper part of the rocking body 20, and the lower end of the push rod 24 is fitted into each recess 33 with an appropriate play. In addition, if each push rod 24 has the same length, the first
Starting from the recess 33 on the left side in FIGS.

Further, on the side of each group of selection levers 22, a first
Selection lever 3 for multiple zigzag patterns as shown
4, the rear end of which is swingably attached to the shaft 23, a pattern selection button 35 is fixed to the tip of each lever, and the arm at the lower rear end of each lever 34 is attached to the receiving part 28 of the selection plate 27. It is arranged so that it comes in contact with the

Reference numeral 36 in FIGS. 3 and 4 is a locking plate whose lower end is swingably attached to the sewing machine arm 2 via a shaft 37.
A locking hole 39 is provided for each selection lever 22, 34 to lock a protrusion 38 on the front thereof. Although not shown, each selection lever 22, 34 is equipped with a spring that pushes it upward, and the locking plate 36 is equipped with a spring that pushes it toward each selection lever 22, 34.

Further, a cancel button 41 and a base line conversion button 42 are provided adjacent to the left end of the selection button group 35 as shown in FIG. This release button 41 has a lever 43 integrally attached to the shaft 23 so as to be able to swing freely, and is given upward elasticity by a spring.The front end of the lever has a protrusion similar to the protrusion 38 of the lever 22, etc. However, the locking plate 36 does not have a locking hole that engages with this. Also, there is nothing corresponding to the arm 26. Therefore, when this release button 41 is pressed down, the protruding piece at the front end of the lever 34 tilts the locking plate 36 forward, and the other selection buttons locked in the locking holes 39 of this locking plate 36 are returned to their original positions. .

When the base line conversion button 42 is pressed and any of the other selection buttons 35 is pressed, the stitch pattern selected by the selection button 35 changes, but the details will be explained in detail.

Further, a swing frame 45 is provided on a guide shaft parallel to the cam shaft 3, in which a contact 44 that swings in contact with any of the pattern cam 4 and buttonhole cams 5, 6, and 7 is attached so as to be movable in the axial direction. Installation, connect this frame 45 with 4
6 and 47, and when the selection button 21 is pressed, the contact 44 comes into contact with any of the buttonhole cams 5, 6, and 7, and the selection button 3
When 5 is pressed down, the contact 44 comes into contact with any of the pattern cams 4.

This invention has the above configuration, and when the switching button 13 is in the upper position as shown in FIG. 3, the cloth feed control cam 8 is in the retracted position. Therefore, the limiting plate 32, which is pressed against the cam 8 by the spring 40, is connected to the push rod 2.
4, the push rod 24 can freely descend.

In the above state, buttonhole selection button 21
can be pressed freely, so first press down the leftmost selection button 21 as shown in Fig. 1, lower the leftmost selection lever 22 and push rod 24, and then operate the sewing machine to make the left side of the buttonhole a predetermined length. After sewing, press the second selection button 21 from the left to start the sewing machine, the bar will be sewn, then press the rightmost selection button 21 to sew the right side of the buttonhole to a specified length, and finally from the left. The second selection button 21 is pressed again to complete buttonhole sewing.

Selection button 21 for buttonhole as shown above
When pressed, the protruding piece 38 of the selection lever 22 is locked in the locking hole 39 of the locking plate 36, and the contact portion 32 of the push-down rod 24 descends just in front of the limiting plate 29.
The zigzag width and cloth feed amount are set appropriately and the predetermined portion of the buttonhole is sewn.

Also, when sewing the buttonhole seam mentioned above,
If you try to press the automatic reverse stitching changeover button 13 by mistake, the vertical swing plate 12 integrated with this button 13
As the lever 10 connected to the lower end of the lever 10 tries to rotate forward about the shaft 9, the roller 11 pushes the rear part of the cam 8 forward, but at this time, the front part of the cam 8
It is received by the contact portion 32 of the push rod 24 via the push rod 24 and does not move. Therefore, the selection button 13 cannot be pressed while the buttonhole stitch is being sewn.

Further, after the buttonhole stitching is finished and the release button 41 is pressed to return the selection button 21, each push rod 24 is raised as shown in FIG. Therefore, when the automatic backward sewing switching button 13 is pressed down, and the vertical swing plate 12 integrated therewith is pressed down, and the lever 10 connected to the lower end is rotated, the roller 11 moves the cloth feed control cam 8. Push forward against the spring. Therefore, the limiting plate 29 also rotates slightly forward against the spring 40, and becomes directly below the contact portion 31 as shown in FIG. At this time, the engaging portion 16 on the upper part of the swing plate 12
is locked to the fixed plate 15.

When the sewing machine is operated by pressing any selection button 35 in the above state, the contact 44 is activated by the pattern cam 4.
is swung, the swiveling frame 45 swung together with the swiveling frame 45 swings, and the needle bar mounting frame swivels via the connecting rods 46, 47 to perform zigzag stitching, and the contactor 18 is swung by the cam 8. As a result, the cloth feed adjuster moves and a zigzag pattern including automatic backward stitching is sewn.

In this state, buttonhole selection button 2
Even if you try to press 1, the contact part 31 of the push rod 24
The selection button 21 cannot be pressed because it hits the upper end of the limiting plate 29 and cannot be pressed.

This invention is based on a sewing machine having a plurality of selection buttons for selecting zigzag patterns, an automatic reverse stitch switching button, and a plurality of buttonhole selection buttons as described above. Even if an attempt is made to press the automatic backward sewing switching button 13 during sewing, the button cannot be pressed. Further, even if the user attempts to press the buttonhole selection button 21 by mistake while sewing a zigzag pattern incorporating automatic backward stitching by pressing the automatic backward stitching switching button 13 and the pattern selection button 35, the buttonhole selection button 21 cannot be pressed. Therefore, it is possible to prevent the pattern from being disturbed due to pressing the button incorrectly.

[Brief explanation of the drawing]

Figure 1 is a front view showing the internal structure of the main parts of the sewing machine that implemented this invention, Figure 2 is an enlarged front view of the same main parts, and Figures 3 and 4 are parts showing the various states of the main parts. FIG. 4... Pattern cam, 5, 6, 7... Buttonhole cam, 8... Cloth feed control cam, 10... Push lever, 12... Lifting rocking plate, 13... Automatic reverse sewing switching button, 18... Contact, 20... Rocking body,
21...Buttonhole selection button, 22...Selection lever, 24...Press rod, 29...Limited plate, 3
1, 32... hit section, 35... pattern selection button.

Claims (1)

[Scope of utility model registration request] There are multiple pattern cams and buttonhole cams that rotate in conjunction with the upper shaft of the sewing machine, and a fabric feed control cam that rotates with these cams and is movable in the axial direction, and the needle bar is attached by contacting these cams. In a sewing machine having a pattern selection operation section that operates a cam contactor that swings the frame, a buttonhole selection operation section, and an automatic backward stitch switching operation section, when the automatic backward stitch switching button is in an inactive position, the cloth feed control A limiting plate that can move forward and backward to push the cam backward is provided, and a part of a push rod that moves up and down together with the buttonhole selection operation section and acts on the cloth feed adjustment box when lowered is located in the front of the limiting plate. A part of the pusher rod is provided with a contact portion that becomes the upper part of the limiting plate in the forward position when the pusher rod is raised, and an abutment portion that becomes immediately before the limiter plate in the retracted position when the pusher rod is lowered. Interlock device.