JPS6125145Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch device, and more particularly, the present invention includes a switch member consisting of two fixed contact pieces and a movable contact piece arranged between them separately. an intermediate position located between both fixed contact pieces;
One connection position is bent to one side of the fixed contact against its own elastic force and connected to that one fixed contact piece, and the other is bent to one side of the fixed contact and connected to the other fixed contact piece. This invention relates to a switch device that can assume one connection position and the other connection position, and its purpose is to provide a switch device that is small and has fewer failures.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be explained below with reference to the drawings showing an embodiment of the present invention as a switch mechanism of a sewing machine for sewing buttonholes.

In the figure, 1 is a sewing machine body equipped with an arm 2 and a bed 3 having a workpiece support surface, and the open end of the arm 2 has a sewing machine needle that reciprocates in the vertical direction in conjunction with the main shaft (not shown) of the sewing machine. A needle bar 5 with a needle bar 5 and a presser bar 6, which is always pressed toward the bed 3 by a spring force, are mounted so as to be able to move up and down. A face plate 8 is attached. Further, the needle bar 5 is attached to the arm 2 so as to be able to swing in a direction perpendicular to the cloth feeding direction. A known fabric feeding device (not shown) is provided which performs four-feeding movements to transfer the work fabric. Furthermore, inside the sewing machine body 1, the swing width of the sewing machine needle 4 is adjusted based on the rotation of the sewing machine main shaft (not shown) so as to form a stitch pattern selected by the operator. It is disposed in an electronic control device (not shown) for automatically forming a desired stitch pattern by controlling the base line, the cloth feed amount and feed direction of the cloth feed device, and the like.

Reference numeral 10 denotes a presser foot for buttonholing, which is attached to the lower end of the presser bar 6, and has a mounting piece 11 attached to the presser bar 6, and is movably supported on the mounting piece 11, and has the sewing machine needle at its front end. 4. A rotating piece 13 provided with a through hole 12 for dropping, and the rotating piece 13
The sewing machine needle 4 is slidably fitted on both sides of the
A cloth presser piece 15 having a substantially square cross section and provided with a long hole 14 for dropping, and a cloth presser plate attached to the front end of the cloth presser piece 15 so that its movement can be adjusted using an elastic plate at the rear end of the cloth presser piece 15. A contact portion 16 protruding to the left side of the piece 15
The adjusting plate 17 is provided with a protruding adjustment plate 17. A stopper piece 18 that can be engaged with the front end of the rotating piece 13 is attached to the front end of the cloth presser piece 15. Further, a cloth presser piece 1 is provided on the left side surface of the cloth presser piece 15 so as to face the contact portion 16 of the adjustment plate 17.
A contact plate 19 is provided to protrude above the left side of 5.

Reference numeral 20 denotes a switch device disposed at the open end of the arm 2, which is composed of a mounting frame 21, a switch body 25, and a switching lever 34, which will be described later. 21 is a screw 22 at the open end of the arm 2;
22 is a synthetic resin mounting frame made of electrical insulating material, and a housing portion 24 having opposing inner wall surfaces 23 and 23 is provided on the open end side. Reference numeral 25 denotes a switch body disposed within the storage section 24, which includes two fixed contact pieces 2 disposed approximately parallel to and close to the inner wall surfaces 23, 23 of the storage section 24.
6, 27, and a movable contact piece 28 interposed separately between the two fixed contact pieces 26, 27, and these contact pieces 26, 27, 28 are made of elastic plates with good conductivity. The sewing machine is connected to the sewing machine via electric cords 29, 30, 31, whose base ends pass through a part of the mounting frame 21 and are attached to the mounting frame 21 and connected to their base ends. It is connected to an electronic control circuit (not shown) inside the main body 1. Further, a part of the open ends of the fixed contact pieces 26 and 27 are bent toward the movable contact piece 28 side as shown in FIG. is provided. Reference numeral 33 denotes a screw body screwed onto the upper end of the mounting frame 21, the lower end of which is disposed so as to be able to engage with the fixed contact piece 26 on the front side, and is moved and adjusted in the axial direction to engage the fixed contact piece 26. The gap between the engaging piece 32 of the piece 26 and the movable contact piece 28 is adjusted.

34 is a stepped screw 35 near the mounting frame 21.
a switching lever rotatably attached to the open end of the arm by a
a base 36 rotatable around the base 36; and a fixed contact piece 2 attached to one end extending upward from the base 36.
A switch operation part 38 made of synthetic resin made of electrically insulating material and having a protrusion 37 protruding between 6 and 27.
and a fork 39 provided at the front end of the base 36.
An operating portion 4 is attached to the presser foot so as to be movable up and down, and is engageable with the contact portion 16 and the contact plate 19 of the presser foot 10 at the lower end.
0 is provided with an operating lever body 41. In order to support the operation lever body 41, an elastic plate 43 is spanned between the insertion holes 42, 42 provided in the forked portion 39, and the operation lever 41 is moved to a desired position by the action of the elastic plate 43. It is designed to be kept as is. Note that the operating lever 41 is moved downward as shown in FIG.
The head 41a provided at the upper end of the forked portion 3
The contact portion 1 of the presser foot 10 is in contact with the upper side of the presser foot 9.
6 and the use position where it can engage with the contact plate 19, and the 8th
As shown in the figure, it can be moved upward to a storage position where it does not interfere with sewing operations other than buttonhole stitching.

Further, the protrusion 37 of the switch operation part 40 is formed in a circular cross-section with a diameter close to the distance between the fixed contact pieces 26 and 27, and a protrusion 37 located between the movable contact pieces 2 is located at the center of the protrusion 37. A groove 44 into which the part is inserted is provided.

The present embodiment has the above-described structure, and its operation will be explained below in accordance with the sewing order for forming a buttonhole stitch.

First, the work cloth W is placed between the presser foot 15 and the bed 3 so that the portion of the work cloth W where the buttonhole is formed is located below the presser foot 15 of the presser foot 10. Next, when the stopper piece 18 is brought into contact with the front end of the rotary piece 13 and the abutment plate 19 is brought into contact with the operating part 40 of the operating lever body 41, the operating part 40 is placed on the cloth feed side of the sewing machine (see Fig. 1). ) to the left of
The switching lever 34 is rotated clockwise as shown in FIG.
8 is bent toward the front fixed contact piece 26 and connected to the fixed contact piece 26, as shown in FIG. 5b.

When the arm is started in this state, the bartacking portion A of the buttonhole stitch is formed as shown in FIG. 9a under the control of an electronic control circuit (not shown) inside the sewing machine body 1. . During this time, the movable contact piece 28 and the fixed contact piece 26 are in a connected state, but since no current is flowing through the switch device 20 at this time, other devices are not affected. Note that when the work cloth W is transported by a cloth feeding device (not shown), the work cloth W is also transported together with the work presser piece 15.

Next, when the bar tacking portion A is formed, the electronic control circuit changes the oscillation width and base line of the sewing machine needle, and the amount of cloth feed, and also changes the cloth feed (arrow R in Fig. 1).
direction), and the left side hem B is formed. As sewing of the hem B begins, the contact plate 19 of the presser foot 15 separates from the operating section 40 of the operating lever body 41. Due to the elastic force of the movable contact piece 28, the switching lever 34 is moved counterclockwise in FIG. At the same time, the movable contact piece 28 is returned to the state separated from both the fixed contact pieces 26 and 27 as shown in FIG. 5a.

During the sewing of the hem B, a current is applied to the movable contact piece 28 under the control of the electronic control circuit. Thereafter, when most of the overhanging portion B is formed, the contact portion 16 of the adjustment portion 17 is pressed against the operating lever body 41.
The switching lever 34 is rotated counterclockwise in FIG. 1, and the movable contact piece 28 is moved through the protrusion 37 to the rear side as shown in FIG. 5C. The movable contact piece 28 is connected to the fixed contact piece 27 by being bent toward the fixed contact piece 27 side. When a current flows from the movable contact piece 28 to the fixed contact piece 27 based on these connections, the current is transmitted as a signal to the electronic control circuit (not shown), and the electronic control circuit controls the swing width of the sewing machine needle 4. Then, the base line and cloth feed amount are changed, and sewing of the bar tacking portion C is started.

When the bar tacking portion C is formed by a predetermined number of stitches, the width, base line, and cloth feed amount of the sewing machine needle 4 are changed under the control of the electronic control circuit, and the workpiece cloth W is fed normally, and the work cloth W is It is transferred together with the presser piece 15 in the direction of the arrow F in FIG. 1, and the right side hem D is sewn. As the hem D is sewn, the abutting part 16 of the adjustment plate 17 is attached to the operating part 4 of the operating lever body 41.
0, the elastic force of the movable contact piece 28 causes the switching lever 34 to rotate clockwise in FIG. It will return to a more separate state.

When the overcut portion D is almost completely formed, the contact plate 19 of the presser foot piece 15 is again pressed against the operating portion 40 of the operating body 41.
Therefore, the switching lever is rotated clockwise in FIG. 1, and the movable contact piece 28 is bent toward the front fixed contact piece 26 via the protrusion 37. is connected to the fixed contact piece 26 as shown in FIG. 5b. Based on these connections, current flows through the movable contact piece 28 to the fixed contact piece 26. The current is transmitted as a signal to the electronic control circuit (not shown), and the sewing machine 1 is stopped with the sewing machine needle 4 positioned above the work cloth W under the control of the electronic control circuit.

When the sewing machine is started after inserting the work cloth W under the presser foot 10 in this way, the buttonhole stitch is automatically formed, so the work cloth W is removed from the underside of the presser foot 10. After that, the button hole E may be formed by making an incision in the center of the seam with a knife or the like.

In this embodiment, the work cloth W is held by the presser foot 1.
0, when taking out the work cloth W from the underside of the presser foot 10, or when forming other stitches, the operator's hand may accidentally touch the operating lever body 41, causing the operating lever to be damaged. If the body 41 is strongly pressed in the direction of rotation, the protrusion 37 should have a diameter close to the distance between the fixed contact pieces 26, 27, and are disposed close to both inner wall surfaces 23, 23 of the mounting frame 21, so that the protrusion 3
7, one fixed contact piece 26 is connected to one inner wall surface 23.
The inner wall surface 23 of the protrusion 37 is prevented from rotating. Therefore, the movable contact piece 28 and the fixed contact pieces 26, 27 are not rotated beyond their elastic limits, so they are not broken, and the fixed contact pieces 26, 27 are not rotated beyond their elastic limits. Once abutted, the movable contact piece 28 is not rotated any further, so the movable contact piece 28 is not pressed extremely strongly against the engaging parts 32, 32 of the fixed contact pieces 26, 27. 32 is not deformed.

As detailed above, the present invention includes two fixed contact pieces disposed in the storage part of the mounting frame close to the inner wall surface of the storage part, and a fixed contact piece arranged between the two fixed contact pieces. A switching member consisting of a movable contact piece is provided, and a switching lever having an engaging portion that engages with an intermediate portion of the movable contact piece is rotatably provided on the mounting frame or the frame to which it is attached. Since the two fixed contact pieces and one movable contact piece are arranged in the storage section of the mounting frame, they can be made compact, and the fixed contact piece can be stored inside the mounting frame. Since the movable contact piece is arranged close to the inner wall surface of the storage part, when the movable contact piece is rotated toward the fixed contact side, the fixed contact piece engages with the inner wall surface of the storage part, preventing their rotation. Furthermore, since the engaging portion of the switching lever is formed in a circular cross-section with a diameter close to the spacing between the fixed contact pieces, the movable contact pieces are not damaged. When the fixed contact piece comes into contact with the inner wall surface as described above when the piece is rotated to the fixed contact side, the movable contact piece is also not rotated any further, so that the movable contact pieces and their engaging pieces are Damage can be prevented.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that changes may be made as appropriate without departing from the spirit of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a left side view of the sewing machine, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. 1, and Fig. 4 is an enlarged sectional view taken along the - line in Fig. 1. Fifth
6 is an operation explanatory diagram showing the operation of the switch device, FIG. 7 is a perspective view showing the movable contact piece and the fixed contact piece, FIG. 8 is a left side view showing the retracted state of the operating lever body, and FIG. The figure is a drawing showing seams. In the figure, 1 is the sewing machine body, 20 is a switch device, 2
1 is a mounting frame body, 23, 23 are inner wall surfaces, 24 is a storage section, 25 is a switch body, 26, 27 are fixed contact pieces,
28 is a movable contact piece, 32 is an engaging piece, 34 is a switching lever, 37 is a protrusion, and 44 is a groove.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A mounting frame made of an electrically insulating material and provided with storage portions having opposing inner wall portions; It consists of two fixed contact pieces that are in contact with each other, and a movable contact piece that is arranged separately between both of the fixed contact pieces, the base ends of which are attached to the mounting frame, and the fixed contact pieces. and a switch member made of an elastic plate having an engagement piece provided at an open end of at least one of the movable contact pieces for electrically connecting the two, and an intermediate portion rotating on the mounting frame or the frame to which it is attached. a switching lever which is movably mounted and has an engaging part made of an electrically insulating material at one end that engages with the intermediate part of the movable contact piece. 2. The above-mentioned utility model registration characterized in that the engaging part of the switching lever is a protrusion that protrudes between the fixed contact pieces and has a groove in the center thereof into which the intermediate part of the movable contact piece is inserted. A switch device according to claim 1. 3. The switch device according to claim 2, wherein the protrusion has a substantially circular cross section with a diameter close to the distance between the fixed contact pieces. .