JPH10235046A - Seam mode switching device of overlock machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easier to switch between fringe linking and lapping and to prevent switching erroneous operation. SOLUTION: When a shaft 12 is rotated within a predetermined range of angles by a stepping motor 10, the inclination of a groove 20a in a feed adjuster 20 is adjusted and the workpiece feed pitch of a feed dog is adjusted via a feed dog adjustment mechanism. A predetermined space is secured between an operating arms 300 and an operating plate 302, and when the shaft 12 is rotated within the predetermined range of angles, the operating arm 300 does not abut to the operating plate 302, but if the shaft 12 is rotated in excess of the predetermined range of angles, the operating plate 302 is slid by a predetermined connecting mechanism to adjust the position where a cam part 327a abuts to a feed adjustment lever 341, thereby switching a thread sliding piece 343 between operating and non-operating positions. Also, the position where a cam part 341b abuts to a screw 345a is adjusted to adjust the lateral positions of the thread sliding piece 343, a lower knife 346, and an upper knife. Thereafter, the shaft 12 is rotated back, a predetermined angle within the predetermined range is attained, and the feed pitch is also switched to a predetermined size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stitch mode switching device for an overlock sewing machine, which is provided in an overlock sewing machine and switches the stitch mode to overlock sewing or winding sewing as desired.

[0002]

2. Description of the Related Art In a conventional overlock sewing machine, a workpiece is cut by an upper knife and a lower knife in front of a needle drop position in accordance with the movement of the workpiece sent by a feed dog. Overcast on the edge. FIG. 31 shows a normal overlock stitch formed on the edge portion 101 of the sewing object 100 in this manner.

When the stitching method is switched from the normal overlock sewing to the winding sewing, the thread sliding piece for supporting the edge portion of the sewing object at the overlock sewing is positioned at a position where the thread slide is exposed from under the needle plate. It is possible to move from the (working position) to a position (inactive position) where the sewing object is stored under the needle plate, and to bend the edge portion of the sewing object so as to be wound by the tension of the thread. Also,
The cutting position of the work to be sewn by the upper and lower scalpels is moved and adjusted so that the overlock width becomes narrower than the normal overlock sewing. Further, the sewing pitch (pitch in the sewing direction) is adjusted so as to be narrower than the normal edge overlock sewing. FIG. 32 shows winding sewing formed on the edge portion 101 of the work 100 in this manner.

As described above, when the stitch type is switched from the overlock sewing to the winding sewing by the overlock sewing machine, (1) the thread sliding piece is switched from a predetermined operation position to an inoperative position, and (2) the overlock width is set to a predetermined amount. (3) It is necessary to change the feed pitch to a predetermined amount.

[0005] However, it is troublesome to perform all three switching operations individually, and there is a problem that an operation error is likely to occur even for an experienced operator.

Accordingly, as a technique for solving such a problem, Japanese Patent Application Laid-Open Nos. 2-154788 and 4-3 are known.
There is a technique disclosed in Japanese Patent No. 12493.

In the technique disclosed in Japanese Patent Application Laid-Open No. 2-154788, a thread sliding piece switching mechanism for switching the position of the thread sliding piece is provided on a lower knife adjusting dial shaft for adjusting the lower knife holder to which the lower knife is fixed to the left and right. The cam is fixed. And
By turning a predetermined lower knife adjustment dial, the lower knife adjustment dial shaft is driven to adjust the position of the thread slide, and in conjunction with this, the lower knife is adjusted to adjust the overlock width.

According to the technique disclosed in Japanese Patent Application Laid-Open No. 4-31493, a cloth feed dial for switching a cloth feed pitch is
An adjusting claw switching cam for switching the position of the adjusting claw (thread sliding piece) is fixed. The cloth feed pitch is switched by turning the cloth feed dial, and the position of the adjusting claw (thread sliding piece) is adjusted in conjunction with the pitch.

[0009]

However, the above prior art has the following problems.

That is, in the technique disclosed in Japanese Patent Application Laid-Open No. 2-154788, the thread slip can be switched only by operating the lower knife adjustment dial in conjunction with the change of the overlock width.
The fabric feed pitch must be manually switched separately.

In the technique disclosed in Japanese Patent Application Laid-Open No. Hei 4-324493, the thread slide can be switched in conjunction with the switching of the cloth feed pitch only by operating the cloth feed dial, but the overlock width must be manually switched separately. Must.

As described above, the switching of the thread slide, the overlock width, and the feed pitch, which are necessary for switching from the overlock sewing to the winding sewing, also requires a plurality of switching operations according to the above-described conventional technique. Therefore, there is a problem that it is complicated and is not particularly suitable for use in general households.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stitching system switching device for an overlock sewing machine in which the switching operation between the overlock sewing and the winding sewing is simpler than the conventional one and there is no mistake in the switching operation.

Another object of the present invention is to provide a stitching system switching device for an overlock sewing machine, which is capable of switching the thread sliding piece and adjusting the overhang width independently of the adjustment of the feed pitch. Is to do.

Another object of the present invention is to provide a stitching system switching device for an overlock sewing machine, which is capable of adjusting only the overlock width separately from the switching of the thread slide and the adjustment of the feed pitch. It is in.

It is another object of the present invention to provide a stitching system switching device for an overlock sewing machine, which can adjust a thread sliding piece and an overhang width separately from a feed pitch.

[0017]

Means for solving the above-mentioned problems will be described by adding corresponding member names and reference numerals in parentheses in the embodiments of the invention described later.

(1) The invention according to claim 1 is characterized in that a thread sliding piece (343) and a thread sliding piece switching means (switching a position of the thread sliding piece to a predetermined working position or a predetermined inoperative position). Cam portion 327a, thread slide lever 341 and thread slide shaft 34
2. Guide member 344 / thread slide lever 347, thread slide operation cam 384) and an overlock width adjusting means (cam portion 327b, screw 345a, lower knife holder positioning shaft 345, lower knife holder) for adjusting the overlock width of the sewing material. 340, upper knife holder 360 / cam portion 392a, adjusting shaft 393), and feed pitch adjusting means (feed adjuster 20, feed adjuster shaft 12 / feed adjusting cam 372) for adjusting the feed pitch of the workpiece.
Selection drive means (feed adjustment stepping motor 10 / feed adjustment dial 37) for selecting between overcasting and winding sewing
1) and the driving of the selection driving means, the thread sliding piece switching means, the overlock width adjusting means and the feed pitch adjusting means are interlocked, and the respective means are interlocked to positions suitable for edge overlocking or winding sewing, respectively. And a moving means (operating arm 300, operating plate 302, operating gear 322 / operating cam 376 / switching shaft 370, operating plate 385, operating cam 382) for moving by moving. Device ”.

According to the stitch system switching device of the overlock sewing machine according to the first aspect, the thread sliding piece switching unit, the overlock width adjusting unit, and the feed pitch adjusting unit are interlocked by the driving of the driving unit. Since the means is moved to the position suitable for the overlock sewing or the winding sewing, respectively, the switching between the overlock sewing and the winding sewing can be performed by a single operation.

Therefore, according to the stitch system switching device of the overlock sewing machine according to the first aspect, the switching operation between the overlock sewing and the winding sewing can be simplified and the switching operation error can be prevented.

(2) According to a second aspect of the present invention, the feed pitch adjusting means (the feed adjustment dial 371 and the feed adjustment cam 372) is provided with a variable area (groove cam 372a) for changing the feed pitch of the workpiece. B, C) and an invariable area (A of the groove cam 372a) which is not changed, and when the invariable area of the feed pitch adjusting means moves, the thread sliding piece switching means and the overlock width adjusting means move to predetermined positions. Possible moving means (operation plate 385, thread slide operation cam 384, operation cam 3
82, operating link 387, connecting arm 388, gear 391,
And an adjusting cam 392). "

According to the stitching system switching device of the overlock sewing machine according to the first aspect, it is possible to perform the switching of the thread slide and the adjustment of the overlock width independently of the adjustment of the feed pitch.

(3) In the above case, for example, "the moving means has an operating cam (382) having a plurality of cam portions, and a connecting means engageable with the operating cam and connected to the overlock width adjusting means. (Operating plate 385, operating link 387, connecting arm 388, adjusting cam 392) and a driving member (thread sliding piece operating cam 384) for driving the thread sliding piece switching means, and rotation of the feed pitch adjusting means. 2. The device according to claim 1, wherein one of the operation cams engages with the connecting means to adjust a width of the connection member according to a direction, and drives the drive member to move a position of the thread slide to a predetermined position. 3. A stitch method switching device for an overlock sewing machine (Claim 3).

(4) The fourth aspect of the present invention provides a yarn sliding piece (343) and a yarn sliding piece switching means for switching the position of the yarn sliding piece to a predetermined working position or a predetermined inoperative position. Cam portion 327a, thread slide lever 341 and thread slide shaft 34
2, the guide member 344), the overlock width adjusting means (the cam portion 327b, the screw 345a, the lower knife holder positioning shaft 345, the lower knife holder 340, the upper knife holder 360) for adjusting the overhang width of the sewing object, and the thread sliding piece switching. Holding means (gear 320, adjusting shaft 321, operating gear 322, click plate 313) capable of holding the means and the overlock width adjusting means at predetermined positions, and feed pitch adjusting means (feed) for adjusting the feed pitch of the sewing material. In connection with the operation of the adjuster 20, the feed adjuster shaft 12) and the operation of the feed pitch adjusting means, the holding of the holding means with respect to the thread sliding piece and the overlock width is released, and the thread sliding piece switching means and the A moving means (operating arm 300, operating plate 302, operating gear 322) capable of moving the overlock width adjusting means to a predetermined position; It is a system switching device ".

According to the stitching system switching device for an overlock sewing machine according to the fourth aspect, since the switching of the overlock width and the switching of the thread slide are linked to the adjustment of the feed pitch, the feed pitch can be adjusted. By doing so, the overlock width and the switching of the yarn sliding piece can be performed at the same time.

Therefore, according to the stitching system switching device of the overlock sewing machine according to the fourth aspect, the switching operation between the overlock sewing and the winding sewing can be simplified and the switching operation error can be prevented.

(5) In the above case, for example, "the moving means is an operating arm (300) connected to the feed pitch adjusting means.
And an operating plate (302) that can be engaged with the holding means, wherein the operating arm and the operating plate are separated by a predetermined amount in a feed pitch adjusting region of the sewing object. Of the overlock sewing machine of the present invention (claim 5).

(6) According to a sixth aspect of the present invention, there is provided an apparatus according to claim 6, wherein the overlock width adjusting means is independently driven by the overlock width independent driving means (adjustment knob 326, adjusting knob The stitching system switching device for an overlock sewing machine according to claim 4, comprising a shaft (321). "
It is.

According to the stitch system switching device of the overlock sewing machine according to the fifth aspect, it is possible to perform the switching of the thread slide and the adjustment of the feed pitch and the adjustment of only the overhang width.

(7) The seventh aspect of the present invention provides a thread sliding piece (343) and a thread sliding piece switching means (switching means for switching the position of the thread sliding piece between a predetermined operating position and a predetermined inoperative position. Cam portion 327a, thread slide lever 341 and thread slide shaft 34
2, the guide member 344), the overlock width adjusting means (the cam portion 327b, the screw 345a, the lower knife holder positioning shaft 345, the lower knife holder 340, the upper knife holder 360) for adjusting the overhang width of the sewing object, and the thread sliding piece switching. Holding means (gear 320, adjusting shaft 321, operating gear 322, click plate 313) capable of holding the means and the overlock width adjusting means at predetermined positions, and feed pitch adjusting means (feed) for adjusting the feed pitch of the sewing material. In connection with the operation of the adjuster 20, the feed adjuster shaft 12) and the operation of the feed pitch adjusting means, the holding of the holding means with respect to the thread sliding piece and the overlock width is released, and the thread sliding piece switching means and the Moving means (operating arm 300, operating plate 302, operating gear 322) capable of moving the overlock width adjusting means to a predetermined position; Dial 371, feed adjusting cam 3
72) has a variable area (B, C of the groove cam 372a) for changing the feed pitch of the sewing object and an invariable area (A of the groove cam 372a) not to change, and the constant area movement of the feed pitch adjusting means. At this time, the holding means with respect to the yarn sliding piece and the overlock width is released, and the yarn sliding piece switching means and the overlock width adjusting means can be moved to predetermined positions by moving means (the operating cam 376 and the operating plate 302). ), A stitching system switching device for overlock sewing machines "
It is.

According to the stitch system switching device of the overlock sewing machine according to the seventh aspect, the switching operation between the overlock sewing and the winding sewing can be simplified and the switching operation error can be prevented.

In addition, it is possible to adjust the yarn sliding piece and the overlock width separately from the feed pitch.

(8) According to an eighth aspect of the present invention, there is provided an image forming apparatus, wherein the moving means (operating cam 376, operating plate 302) is capable of engaging with an operating cam (376) having a plurality of cam portions and a holding means. An operating plate (302), and selecting means (the operating plate 302, the cam portion 376a, or the like) for selecting any one of the plurality of cam portions of the moving device in accordance with the rotation direction of the feed pitch adjusting device. 376b, protrusion 375e, compression spring 37
8), and a stitching system switching device for an overlock sewing machine according to claim 7 (claim 8).

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION

 [First Embodiment of the Invention] First, the configuration will be described.

FIGS. 1 and 2 show a switching adjusting mechanism 1 and a feed dog driving mechanism 2 of a stitch type switching apparatus according to an embodiment of the present invention.

As shown in the figure, the switching adjustment mechanism 1
A feed adjusting stepping motor 10 is provided, and a drive gear 11 is attached to a motor shaft 10a. The feed adjusting shaft 12 is rotatably supported by a sewing machine frame (not shown). A switching gear 13 is fixed to one of the feed adjuster shafts 12, and the switching gear 13 meshes with the drive gear 11.

A feed adjuster 20 constituting the feed dog drive mechanism 2 is fixed to the other end of the feed adjuster shaft 12. The feed adjuster 20 has a sliding groove 20a.
The sliding groove 20a is curved in an arc shape in the length direction of the groove, and the square piece 21 is slidably fitted in the groove 20a.

Reference numeral 5 denotes a main shaft of the overlock sewing machine, which is driven by a main motor (not shown) via a timing belt (not shown). A vertical feed cam 22 constituting the feed dog driving mechanism 2 is attached to the main shaft 5 and is engaged with a bifurcation 23 a of a feed base 23.

A horizontal feed cam 25a is attached to the main shaft 5, and a base end of a horizontal feed rod 25b is engaged. The tail end side of the horizontal feed rod 25b, the square piece 21 and one end side of the horizontal feed link 26 are rotatably attached to each other by a square piece shaft 21a. The feed arm 27 has a support shaft 27a fixed to the center of the shaft.
Is rotatably supported by a sewing machine frame (not shown). One end of the feed arm 27 is rotatably connected to the other end of the horizontal feed link 26 and a shaft 27b. The end of the feed base 23 opposite to the side on which the bifurcated portion 23a is formed and the other end of the feed arm 27 are rotatably connected to each other via a shaft 27c. A feed dog 24 is fixed to the feed base 23.

Next, the configuration of the overlock width adjusting / thread sliding piece switching mechanism 3 of the stitch type switching apparatus according to an embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 3, the overlock width adjusting / thread sliding piece switching mechanism 3 includes an operating plate moving mechanism 30 and a click mechanism 3.
1. A thread sliding piece moving mechanism 32, a lower knife moving mechanism 33, a lower knife holder mechanism 34, an upper knife mechanism 36, and the like.

The operation plate moving mechanism 30 will be described with reference to FIG.

An operation plate 300 is screwed and fixed to the feed adjusting shaft 12. The bottom of the operation plate mounting plate 301 is fixed to the sewing machine frame with screws. Arms 301a, 301a extend from the operation plate mounting plate 301. The operation plate 302 has long holes 302a, 302a formed therein. The arms 301a, 301a and the long holes 302a,
The operating plate 302 is slidably movable in the horizontal direction with respect to the operating plate mounting plate 301.

An arm 304 extends from a lower portion of the operation plate 302. The operation arm 300 and one end edge 302b of the operation plate 302 face each other, and when the feed adjuster shaft 12 rotates by a predetermined angle or more, the operation plate 300 comes into contact with the end edge 302b. Arm 304 and one arm 3 of operating plate mounting plate 301
01a is connected to the operating plate 30 by a tension spring 305.
2 is urged toward the operation arm 300 side. The tip of the arm 304 is bent in the horizontal direction to form a cut-and-raised portion 304a.
Further, a part of the edge of the operation plate 302 forms an inclined cam portion 302c having a predetermined shape.

The click mechanism 31 will be described with reference to FIGS. 3, 4, and 5.

As shown in FIGS. 3, 4 and 5, the click operation cam 310 has an inclined cam portion 30 of an operation plate 302.
A contact portion 310a of a predetermined shape is formed to contact with 2c. Further, a cam portion 310b having a predetermined shape is also formed. The click operation cam 310 is rotatably supported by a shaft 311, and the click operation cam 310 is urged by a torsion compression spring 312 so as to rotate in a direction indicated by an arrow shown in FIG. 5. Also, the contact portion 310a is urged to move in the direction of the cam portion 302c, and
Are always in contact. Further, the contact portion 310
a tension spring 306 is stretched between the front end of the sewing machine frame and the sewing machine frame (not shown).
The click operation cam 310 is also urged in the direction of the arrow shown in FIG. 5 to facilitate rotation.

As shown in FIG. 3 and FIG.
3 is rotatably attached to the sewing machine frame 314. One end of the click plate 313 forms a bent portion 313a bent in a dogleg shape, and the other end forms a bent portion 313b bent in a hook shape and abutting on the click operation cam 310a. Sewing machine frame 3
14 is provided with a shaft 315, on which a torsion spring 315 is interposed. Click operation cam 310
Is biased by the torsion spring 315 in the direction in which the adjustment gear 320 and the distal end of the bent portion 313a engage. The adjustment gear 320 is fixed to an adjustment shaft 321 supported by the sewing machine frame 314. As shown in FIG. 6, an adjustment knob 326 for manually switching the overhang width and the thread slide (described later) is attached to the adjustment shaft 321.

Referring to FIGS. 3 and 6, lower knife moving mechanism 3
3 will be described.

As shown in FIGS. 3 and 6, the lower knife holder detaching plate 330 is rotatably attached to a shaft 330a fixed to a sewing machine frame (not shown).
The operating plate 302 is rotated by being pressed by the cut-and-raised portion 304a of the operating plate 302 which is pressed and slid by the operating arm 300. By the return torsion spring 334, the lower knife holder detaching plate 330 is urged to rotate about the axis 330a in a direction in which it comes into contact with the cut-and-raised portion 304a.

The lower knife holder shaft 331 is the sewing machine frame 3
14 is slidably inserted and supported. A lower knife holder 340 is fixed to one end of the lower knife holder shaft 331, and a lower knife holder spring collar 332 is fixed to the other end.

A compression spring 333 is provided at a position between the sewing machine frame 314 and the lower knife holder spring collar 332 on the lower knife holder shaft 331. This allows
The cam 327b of the adjusting cam 327 and the screw 345a are urged so as to be in contact with each other.

Usually, there is a gap between the lower knife holder spring collar 332 and the lower knife holder cut-off plate 330, and they come into contact only when the lower knife holder cut-off plate 330 rotates. The portion of the lower knife holder detaching plate 330 that contacts the lower knife holder spring collar 332 is a cam. When the lower knife holder detaching plate 330 is rotated by being pressed by the cut-and-raised portion 304a, the compression spring 333 is formed by the cam shape. Against the elastic force of the lower knife holder spring collar 3
32, and finally the lower knife holder shaft 331 is pushed out.

Referring to FIGS. 3 and 4, thread sliding piece moving mechanism 3
2 will be described.

As shown in FIG. 3 and FIG.
Is a substantially fan-shaped member, and is rotatably attached to the sewing machine frame 314 by a shaft 323 at a base end portion, which is a key position of the fan. Then, teeth are formed along the fan-shaped arc-shaped edge, and the teeth mesh with the teeth of the adjustment gear 320. From the side edge of the operating gear 322, the arm 3
22a is extended. The shaft 3 is moved in a direction in which the arm portion 322a contacts one end edge 302d of the operation plate 302.
The operating gear 322 is urged by a torsion spring 325 so as to rotate about the rotation center 23.

An adjusting cam 327 is screwed and fixed to an end of the adjusting shaft 321 on the lower knife holder 340 side. As shown in FIG. 7, the adjusting cam 327 includes a cam portion 327a having two radii, large and small, for switching thread sliding pieces (described later), and a cam portion 327b for switching the position of the lower knife holder 340. Is provided. Further, stoppers 327c and 327c for locking the movement of the screw 345a are provided on both ends of the cam portion 327b.

The lower knife holder mechanism 34 will be described with reference to FIGS.

As shown in FIG. 3 and FIG.
41 is rotatably attached to the lower knife holder 340, and a shaft 341b extends from one end.
The thread sliding piece lever 341 is biased by a torsion spring 341a, and the shaft 341b is constantly pressed against the cam portion 327a. The other end is rotatably attached to one end of the thread slide shaft 342. A thread slide 343 is attached to the other end of the thread slide shaft 342. Thread slide shaft 34
2 is guided by a thread slide guide 344 attached to the lower knife holder 340, and is slidable in the axial direction. Further, the thread sliding piece shaft 342 is urged toward the bottom surface of the needle plate 350 (clockwise in FIG. 8) by the torsion spring 341c.

When the thread slide lever 341 is rotated clockwise in FIG. 8 by the contact position of the shaft 341b with the cam portion 327a, the thread slide shaft 342 is pulled to the right. At this time, the right side of the thread slide shaft 342 is pulled up, but the left side of the thread slide shaft 342 is regulated by the thread slide guide 344, so that the thread slide 343 is pulled under the needle plate 350. (State of FIG. 8A).

A lower knife holder positioning shaft 345 is fixed to a portion of the lower knife holder 340 facing the axis of the adjustment shaft 321. A screw 345a is fixed to a position where the lower knife holder 340 abuts on the cam portion 327b. The screw head comes into contact with the cam portion 327b. A lower knife 346 is formed on the upper edge of the lower knife holder 340.

The upper knife mechanism 36 will be described with reference to FIG.

As shown in FIG. 9, it is connected to the main shaft 5 (see FIG. 1) by a well-known mechanism, and is attached to the distal end of an upper knife operating arm 360 which reciprocates up and down in conjunction with the rotation of the main shaft 5. The upper knife 361 is urged by the compression spring 362 and pressed against the lower knife 346. Thus, even if the lower knife holder 340 moves in the axial direction of the lower knife holder shaft 331, the contact state of the upper and lower knife 361, 346 is maintained.

As shown in FIG. 10A, a cutout 351 from which the thread sliding piece 343 is exposed and a cutout 352 from which the lower knife 346 is exposed are formed in the needle plate 350. Notch 3
From 51, a support bar 353 for bending the edge portion of the sewing object at the time of winding sewing extends in parallel with the thread sliding piece 343.

The feed plate 24 is provided with the feed dog 24 and other feed dogs 355, 356a and 356b for feeding an object to be sewn by a predetermined driving mechanism. , 354b, 355, 356a and 35
6b are formed.

As shown in FIG. 11, the overlock sewing machine 4 is provided with a needle bar 40, upper and lower loopers 41 and 42, and a needle 43 attached to the needle bar 40, which are driven by a known mechanism.

On the sewing machine head of the overlock sewing machine 4, a feed manual switch 50 for adjusting the feed pitch as desired, and a 7-segment LED for displaying the feed pitch set by the feed manual switch 50 in millimeters, etc. And a predetermined display unit 51 is provided. Further, a winding sewing button 52 for switching the stitch system from overlock sewing to winding sewing and an overlock sewing button 53 for switching from winding sewing to overlock sewing are provided. Although illustration is omitted in the overlock sewing machine 4,
A well-known microcomputer is provided, and the microcomputer, the feed adjustment stepping motor 10, the display 51, the feed manual switch 50,
The winding sewing button 52, the overlock sewing button 53, and the like are connected. The ROM of the microcomputer stores a predetermined control program for controlling the device and fixed data.

Next, the operation will be described.

When the main shaft 5 starts sewing by a sewing machine motor (not shown), the upper and lower knives 361 and 346 (see FIG. 7 and the like) cooperate to cut the workpiece along the feed movement.

The thread sliding piece 343 is located immediately after the lower knife 346 when viewed in the sewing direction, and in the case of normal edge overlock sewing, the lower looper thread and the upper looper thread that are entangled form a thread sliding piece. Since the stitches are formed in a state where the stitches are hooked, the overhang width is determined by the positions of the lower knife 346 and the thread sliding pieces 343.

In the overlock sewing machine 4, set values of a normal overlock width and a feed pitch in the case of overlock stitching are provided (for example, an overlock width of 6 mm and a feed pitch of 2.5).
mm).

If the user wants to change the length as desired, and if it is the overhang width, as shown in FIGS. 3, 4, 5, and 7, the adjustment knob 326 is rotated to rotate the cam 327b and the screw 345a. The lower knife holder 340 moves in the left and right directions as viewed from the sewing direction by adjusting the contact position with the threading piece 34 supported by the lower knife holder 340.
The 3 and lower knife 346 (and the upper knife 361 in contact with the lower knife 346) also move in the same manner, and the overlock width is manually adjusted.

The tip of the bent portion 313a of the click plate 313 is urged by the spring 315 to mesh with the gear 320, and the rotation of the adjustment shaft 321 is locked.
The elastic force of the spring 315 is large enough not to hinder the turning of the adjusting knob 326 manually.
6, the adjustment shaft 3 against the elastic force of the spring 315
21 can easily rotate.

To change the feed pitch, refer to FIGS.
By operating the feed manual switch 50, a predetermined step angle excitation signal is generated within a feed pitch range of 1 to 4 mm, for example.
And the excitation phase changes, and the feed pitch is changed. That is, in accordance with the direction and angle of rotation of the gear 11 by the motor 10, the inclination of the feed adjuster shaft 12, and thus the inclination of the sliding groove 20a, fluctuates, and the horizontal direction of the square piece 21 sliding and reciprocating in the groove 20a. Movement range of the feed dog 24
Is manually adjusted.

As will be described later, the feed adjusting shaft 12
Is rotated and the operation plate 302 is slid by the operation arm 300, thereby storing the position of the thread sliding piece 343 in the inoperative position, adjusting the overlock width to a predetermined minimum width, and changing the stitch method. You can switch to winding sewing. However, the operation plate 30
2 is provided with a predetermined space between the end portion 302b and the operating arm 300, and as described above, the feed pitches 1 to 4
Even if the feed adjuster shaft 12 is rotated within a predetermined rotation angle range within the range of mm, the operation arm 300 does not abut on the operation plate 302. Therefore, only the feed pitch is adjusted in the range of 1 to 4 mm, and switching to winding sewing is not performed. Switching to winding sewing is performed when the feed adjuster shaft 12 is rotated beyond the predetermined rotation angle range, as will be apparent from the description below.

Next, a description will be given of a case where, when the stitch method is set to the overlock stitch, this is switched to the winding stitch.

For such switching, the yarn sliding piece 343 is stored in an inoperative position, the overhang width is adjusted to a predetermined minimum width, and the feed pitch is also a predetermined minimum pitch (1 m in the above example).
m). In this example, these operations can be switched collectively only by operating the winding sewing button 52.

That is, when the winding sewing button 52 is operated, a predetermined microcomputer outputs a predetermined winding sewing switching signal. Referring to FIGS. 3 to 6, feed adjustment stepping motor 1 receiving winding stitching switching signal
0 is driven, the feed adjuster shaft 12 rotates, and the operating arm 3
00 contacts the edge 302 b of the operation plate 302. Further, when the feed adjuster shaft 12 rotates, it is pushed out by the operation arm 300 and the operation plate 302 moves against the elastic force of the spring 305, and the contact portion 310
a is pressed, and the click operation cam 310 is moved to the spring 306;
It rotates against the elastic force of 312. And the cam part 31
The position where 0b is in contact with the bent portion 313b fluctuates,
Due to the cam shape of the cam portion 310, the click plate 313 rotates against the elastic force of the spring 315, and the bent portion 313a of the click plate 313 separates from the adjustment gear 320.

At the same time, the cut-and-raised portion 304a of the operation plate 302
Is pressed to rotate the lower knife holder cutting and removing plate 330,
The lower knife holder 340 moves in a direction to compress the compression spring 333. As the lower knife holder 340 moves, the cam portion 327b of the adjusting cam 327 is separated from the screw 345a, and the adjustment is such that only the elastic force of the relatively weak elastic torsion spring 341a attached to the thread slide lever 341 is received. The shaft 321 is rotated (in the counterclockwise direction in FIG. 4) by the elastic force of the torsion spring 324 attached to the operation gear 322, and the screw 345a and the stopper 327 are rotated.
c stops at the position where it comes into contact with c.

When the operation plate 302 is further moved, the cam portion 310a of the click operation cam 310 forms a cam.
The tip of the bent portion 313 a of the click plate 313 is engaged with the adjustment gear 320 again.

When the operating plate 302 is further moved and its edge 302 d presses the arm 322 a of the operating gear 322, the operating gear 322 is moved around the shaft 323 to move the spring 3.
24, the adjusting gear 320 meshing with the operating gear 322 rotates, and the adjusting shaft 321 rotates. The switching position to the winding sewing is performed by setting the thread sliding lever 3 to the small radius cam portion of the cam portion 327a of the adjusting cam 327.
The position of the cam 41 is set to a position where the thread 41 abuts (switching to the inoperative position of the thread sliding piece 343) and a position where the cam portion 327b climbs by a predetermined amount from the lowest point of the valley (switching of the overlock width). Accordingly, the motor 10 rotates the feed adjuster shaft 12 to move the operation plate 302 until reaching this position.

The cam portion 327a at the above-mentioned winding stitching switching position
Since the thread sliding piece lever 341 is in contact with the cam portion having a small radius, the thread sliding piece shaft 342 is rotated clockwise in FIG. 6 by the elastic force of the torsion spring 341a. It is stored under the needle plate 350 (inactive position) (see FIG. 8C).

After the operation plate 302 moves as described above until the position is reached, the feed adjustment stepping motor 10
Of the tension spring 30 is started.
It is returned to the original position by the elastic force of 5. However, since the tip of the bent portion 313a of the click plate 313 meshes with the teeth of the operation gear 320, the adjustment cam 327 does not rotate from the above position. As the operation plate 302 returns, the click operation cam 310 also starts to return and rotate by the elastic force of the springs 306 and 312, and returns to the initial adjustment start position while the compression torsion spring 312 is compressed. At this time, the bent portion 313b of the click plate 313 and the back side 3 of the cam portion 310b
10b1 abuts on the operating gear 320 at the tip of the bent portion 313a, and the click is maintained.

At the same time, the lower knife holder cutting-off plate 3
30 also starts returning rotation by the elastic force of the compression spring 333, and the lower knife holder 340 stops at the position where the cam 327b of the adjustment cam 327 and the screw 345a are in contact. Thereby, the thread sliding piece 343 and the lower knife 346 (furthermore, the upper knife 3
The left and right positions 61) are cam positions where the overlock width is a predetermined minimum width required for winding sewing, and the cam portion 327b and the screw 34
5a contacts.

As described above, the adjustment of the overlock width and the switching of the thread sliding piece 343 to the winding sewing are completed, the feed adjusting stepping motor 10 returns to the origin, and it is determined by the predetermined microcomputer that no step-out has occurred. After confirming,
Driving the motor 10 to minimize the feed pitch (1 m in this example)
m) and the feed adjuster 20 is rotated to the phase indicated by m). As a result, the switching to the winding stitch is also completed for the feed pitch.

When the overlock button 53 is operated,
In the same manner as the above-described switching of the stitch mode from the overlock stitch to the winding stitch, the switching of the stitch mode from the winding stitch to the overlock stitch can be performed at one time. In this case, the thread slip 3
It is necessary to pull out 43 to the notch 351 (action position), switch the feed pitch to 2.5 mm, for example, and switch the overhang width to a predetermined maximum width. In this case, when the cam having a large radius abuts on the thread slide lever 341, the thread slide 343 is switched to the operating position (see FIG. 8B), and the cam stopper of the cam 327 b is moved. The overhang width is set to a predetermined maximum width by the screw 345a abutting on a position slightly lower than the valley 327c. The operation plate 302 is moved by rotating the shaft 12.

During the rotation of the sewing machine, the winding sewing button 5
Even if the button 2 or the button 53 is operated, the switching signal to the winding sewing or the signal to the button sewing by this operation is invalidated.
Only the feed pitch is adjusted by adjusting the rotation angle of.

As described above, according to the above-described embodiment of the present invention, the stitch method can be switched to the winding stitching or the overlocking stitch only by operating the winding stitching button 52 or the buttonhole stitching button 53. It is not necessary to perform a plurality of switching operations.

Therefore, the switching operation between the overlock stitching and the winding stitching can be simplified and the switching operation error can be eliminated.

Also, as described above, the switching adjusting mechanism 1, the feed dog driving mechanism 2, and the overlock width adjusting / thread sliding piece switching mechanism can be switched at once without performing a plurality of switching operations. 3 is configured as described above, and a mechanism for switching the operation and non-operation of the thread slide 343, a mechanism for switching the overlock width, and a mechanism for switching the feed pitch are connected. Using a mechanism, adjustment of only the feed pitch by the feed manual switch 50 and adjustment of only the overhang width by the adjustment knob 326 can be performed.

Further, in order to make it possible to switch only the feed pitch by the above mechanism, only the feed dog drive mechanism 2 is driven when the feed adjuster shaft 12 is at a rotation angle within a predetermined range, and the feed control mechanism 2 is moved beyond the predetermined range. Actuating plate 302 when rotated
Slides to change the stitch type by performing the operation and non-operation of the thread sliding piece 343 and switching the overlock width.

In other words, since such proper use is performed only by the difference in the rotation angle of the feed adjusting shaft 12, adjustment of only the feed pitch can be performed automatically without having to manually perform the adjustment.
In addition, a single actuator (feed adjustment stepping motor 10) can drive the mechanism for that purpose, so that manufacturing costs can be reduced.

[Embodiment 2] First, the configuration will be described.

Referring to FIGS. 12 to 17, the configuration of the overlock width adjusting / thread sliding piece switching mechanism 3a of the stitch type switching apparatus according to the second embodiment of the present invention will be described. The switching adjustment mechanism and the feed dog driving mechanism are common to the switching adjustment mechanism 1 and the feed dog driving mechanism 2 described with reference to FIGS.

Further, the overlock width adjusting / thread sliding piece switching mechanism 3
In FIG. 12A, since the thread sliding piece moving mechanism 32, the lower knife moving mechanism 33, the lower knife holder mechanism 34, the upper knife mechanism 36, and the like are common to the overlock width adjusting / thread sliding piece switching mechanism 3, FIG.
In FIG. 17 to FIG. 17, the same reference numerals are given and detailed description is omitted.

The second embodiment of the present invention relates to a feed pitch,
The adjustment of the position of the thread sliding piece and the lower knife is performed by manual operation of a dial, and a mechanism of an operating plate moving mechanism 30a corresponding to the operating plate moving mechanism 30 and a click mechanism 31a corresponding to the click mechanism 31 are provided. This is different from the first embodiment of the invention, and the following description will focus on these mechanisms. In the description of these mechanisms, members common to the first embodiment of the present invention are denoted by the same reference numerals, and detailed description is omitted.

Referring to FIGS. 12 to 15, the operation plate moving mechanism 30a will be described.

As shown in FIG. 12, a feed adjustment dial 371 is attached to one end of the switching shaft 370.
As shown in FIG. 13, on the feed adjustment dial 371, adjustment positions 1 to 4 of the feed pitch are displayed at two places of “overlock” and “winding”.

As shown in FIG. 14, the switching shaft 370 has
The feed adjusting cam 372 is fixed with a screw 372b.
The feed adjusting cam 372 is formed with a groove cam 372a including an A portion whose distance from the rotation center is entirely constant, and a B portion and a C portion whose distance from the rotation center are changed. .

The feed adjusting link 373 is formed with a long hole 373a having a long axis in the axial direction. The shaft 370 is inserted and engaged with the long hole 373a.
a. A shaft 373b caulked at one end of the feed adjusting link 373 is slidably engaged with the groove cam 372a. The feed adjusting arm 374 has a base end fixed to the feed adjuster shaft 12 with a screw 374a, and a shaft 374b caulked to the tail end is rotatably stopped by an E-ring 374c with the other end of the feed adjusting link 373. Have been.

As shown in FIG. 12, the switching shaft guide 375
Is formed with a long hole 375a, and the shafts 54, 54 extending from the sewing machine frame (not shown) are engaged with the long hole 375a, and are stopped by E-rings 375b, 375b.
The switching shaft guide 375 is slidable.

A switching shaft 370 is rotatably inserted into the cut-and-raised portion 375c of the switching shaft guide 375, and is positioned by an E-ring 370b. At a position between the cut-and-raised portion 375c and the cut-and-raised portion 375d of the switching shaft guide 375, the operation cam 376 is slidably attached to the switching shaft 370. Then, the cut-and-raised portion 375c and the operating cam 3
76, a compression spring 377 is interposed to urge the operation cam 376 and is pressed against the cut-and-raised portion 375d. On the cut-and-raised portion 375d side of the switching shaft 370,
A compression spring 378 is also provided, and the switching shaft guide plate 37 is provided.
5 is pressed against the E-ring 370b. A projection 375e is formed on the cut-and-raised portion 375d.

As shown in FIG. 15, the operation cam 376 is provided with two cam portions 376a and 376b for pressing the end 302b of the operation plate 302 and a projection 376c for switching the cam. I have. Also, the cam portion 376
a and the cam portion 376b are partitioned by a guide portion 376d.

Referring to FIGS. 16 and 17, the configuration of the click mechanism 31a will be described.

The cut and raised portions 302e and 302 of the operation plate 302
The click operation cam shaft 319 is fixed to e.
The click operation cam shaft 319 has a click operation cam 3
16 is rotatably mounted. Click plate 317
Is formed with a bent portion 317a bent in the shape of a square. The click plate 317 is rotatably attached to the shaft 315, and the bent portion 317a is
20 is urged by a torsion spring 315a in a direction in which the torsion spring 315a engages.

The click operation cam 316 is connected to the torsion spring 3.
As a result, the cam portion 316 a of the click operation cam 316 is pressed against the click plate 317. The click plate 317 has an inclined portion 317b whose edge is inclined. Further, the click operation cam 316 is provided with a projection 316b, which comes into contact with the cut-and-raised portion 302e, and is provided with a click operation cam
Lock so that 16 does not rotate.

Next, the operation will be described.

First, a feed pitch of overlock stitch 2.5 mm
Then, the case where the adjustment is changed to the feed pitch of 1 mm for the winding sewing will be described.

The position of the feed adjustment dial 371 when the overfeed sewing feed pitch is 2.5 mm is a position where an intermediate position between 2 and 3 of “overcast” is aligned with an arrow (FIG. 13).
At this time, the feed adjusting cam 372 is set to the B of the groove cam 372a.
The shaft 373b of the feed adjusting link 373 is adjusted to be located near the center of the portion. Operation cam 3 at this time
In reference numeral 02, the cam portions 376a and 376b are located substantially at the lowest position.

From this state, the feed adjusting dial 371
Is rotated in the direction from the "overlock" position to the "winding" position, the feed adjustment cam 372 rotates, and the engagement position of the shaft 373b moves from the B portion of the groove cam 372a to the A portion. Since the distance from the center of rotation of the portion A is constant, the feed adjusting link 373 does not move.

Further, by rotating the feed adjusting dial 371 from the “overlock” position to the “winding” position, the operation cam 376 attached to the switching shaft 370 also rotates, and FIG. ) To (E),
The cam portion 376a pushes the operation plate 302 (the operation plate 302 indicated by a dashed line in FIG. 15). Thereby, the operation plate 30
17 moves to the right in FIG.
The click plate 317 rides on the cam portion 316a by being pushed by the 16 cam portions 316a.
Is rotated about the axis 315 and the click is released. When the operation plate 302 further moves, the click operation cam 31
The cam portion 316a of 6 is disengaged from the click plate 317, and the bent portion 317a and the gear 320 are engaged again by the urging force of the spring 315a, and the click is applied again.

Further, the operation plate 302 is moved, the thread sliding piece 343 is moved to the inoperative position, and the lower knife holder 340 is also moved to the winding sewing position, as in the first embodiment of the present invention. The cam portion 376a of the operation cam 376 has a cam shape that pushes the operation plate 302 to the winding sewing position.

When the feed adjustment dial 371 is further rotated, the operation plate 302 starts returning by the tension spring 305. At this time, the cam portion 316 a of the click operation cam 316 that has passed the operation plate 302 abuts on the inclined portion 317 b of the click plate 317. Further, the operating plate 3
02 returns and moves along the inclined portion 317b.
Since the click plate 317 does not ride on the cam portion 316a since it returns while rotating against the urging force of the torsion spring 318, the click is not released during this return movement.

When the switching shaft 315 further rotates, the projection 376c of the operation cam 376 comes into contact with the projection 375e of the switching shaft guide plate 375. Thereby, the operation cam 3
15, a force is generated to slide the operating plate 302 and the guide portion 37 of the operating cam 376.
6d is in contact, the operation cam 376 is switched to the switching shaft 37.
0, cannot move in the axial direction.
5e rides on, and the switching shaft guide plate 375
It moves downward in FIG. 15 against the urging force of 78.

When the feed adjusting dial 371 is further rotated, the feed adjusting cam 372 rotates, and the shaft 373b moves to the C portion of the cam groove 372a. The distance from the center of rotation of the portion C changes, and the engagement between the shaft 373b and the portion C causes
The feed adjusting link 373 is pushed to the left in FIG. 14, and the feed adjusting arm 374 rotates the feed adjusting shaft 12 to change the inclination of the feed adjusting device 20.

As described above, the feed adjusting dial 37
By one operation of rotating 1, in addition to adjusting the feed pitch required for winding sewing, the thread sliding piece 343 can be changed to the inoperative position, and the position of the lower knife holder 340 can be changed to the winding sewing position.

Next, a description will be given of a case in which the winding stitch is changed to the overlock stitch.

The feed adjustment dial 371 is positioned at the winding stitch position.
If there is, the actuation cam 376 is at the top. When the feed adjusting dial 371 is rotated from the “winding” direction to the “overlock” direction, the operation cam 376 rotates as shown in FIG. 19A to FIG. 19E over time. And the operation cam 37
No. 6 protrusion 376c is the protrusion 375 of the switching shaft guide plate 375.
e (in the state of FIG. 19A), the operation cam 37
6 moves on the switching shaft 370 against the urging force of the compression spring 377.

The moved position is a position where the tip of the cam portion 376b of the operation cam 376 and the end portion 302b of the operation plate 302 face and abut (the position of the operation plate 302 shown by a solid line in FIG. 15). The operation cam 376 further rotates,
The projection 376c of the operation cam 376 and the switching shaft guide plate 37
5 is separated from the end 3 of the operating plate 302
19B is in contact with the guide portion 376d of the operation cam 376 urged by the spring 377, so that the operation plate 302 and the cam portion 376b of the operation cam 376 do not separate (the state of FIG. 19C). ).

The cam portion 376b of the operation cam 376 has a cam shape capable of moving the operation plate 302 so as to rotate the operation gear 322 until the lower knife holder 340 reaches the overlocking position.

That is, the feed adjusting dial 371 is further provided.
Is rotated, the thread sliding piece 343 moves to the operation position, and the lower knife holder 340 moves to the overlocking position, as in the first embodiment of the invention.

As described above, the feed adjusting dial 37
By one operation of turning 1, the feed pitch is adjusted to the overlock sewing, and the thread sliding piece 343 is moved to the operation position, and the lower knife holder 3 is turned.
It becomes possible to move 40 to the position of the overlock stitch.

[Embodiment 3] First, the configuration will be described.

Referring to FIGS. 20 to 23, the configuration of the overlock width adjusting / thread sliding piece switching mechanism 3b of the stitch type switching apparatus according to the third embodiment of the present invention will be described. The switching adjustment mechanism and the feed dog driving mechanism are common to the switching adjustment mechanism 1 and the feed dog driving mechanism 2 according to the first embodiment of the invention described with reference to FIGS.
Detailed description is omitted.

Further, the overlock width adjusting / thread sliding piece switching mechanism 3
b, the upper knife mechanism 36 and the mechanism for driving the feed adjuster shaft 20 of the operating plate moving mechanism 30a are the same as the overlock width adjusting / thread sliding piece switching mechanism 3a, so that illustration and description will be omitted. Omitted. In addition, members having the same reference numerals as those in the first and second embodiments of the invention are the same members, and thus detailed description is omitted.

The third embodiment of the present invention is an example in which a dial for adjusting the feed pitch, switching the thread slide 343, and adjusting the position of the lower knife 346 is provided on the lower knife holder 340 side.

As shown in FIG. 20, the feed adjustment dial 3
A feed adjusting cam 372 is screwed to the switching shaft 370 to which the 71 is attached. The feed adjusting cam 372 is formed with the same groove cam 372a as that of the second embodiment of the present invention, and the feed adjusting link 373 is similarly connected to the E-ring 37.
Stopped at 0a.

As shown in FIG. 21, the feed adjustment dial 3
At 71, the adjustment positions 1 to 4 of the feed pitch are shown
And "Maki (meaning winding sewing)".

The feed adjusting link 373 is interlocked with a feed adjuster shaft (not shown) (similar to the feed adjuster shaft 12 of the second embodiment of the present invention), and is similar to the first and second embodiments of the present invention. The feed pitch can be adjusted.

The switching shaft guide plate 380 has the long holes 380a, 3
80a is formed, and is attached to the sewing machine frame 314 so as to be slidable in the direction of the switching shaft 370 through stepped screws 380b and 380b through the elongated holes 380a and 380a.
A hole 380d is formed in the cut-and-raised portion 380c formed on one side of the switching shaft guide plate 380, and the switching shaft 370 is inserted through the hole 380d. A compression spring 381 is interposed between the cut-and-raised portion 380c and the sewing machine frame 314, and the switching shaft guide plate 380 is connected to the lower knife holder 340.
Is biased to the side. Further, a projection 380e is formed on the cut-and-raised portion 380c.

As shown in FIG. 22 and FIG.
Reference numeral 82 is slidably attached to the switching shaft 370. The operation cam 382 has two cam portions 382 having different shapes.
a, 382b and respective guide portions 382c, 382
d and a protrusion 382e are formed. Operating cam 38
2 is pressed against the cut-and-raised portion 380c of the switching shaft guide plate 380 by the compression spring 383.

A thread slide operating cam 384 is attached to the dial 371 of the switching shaft 370. This cam 3
Reference numeral 84 denotes a cam having two radii, large and small.

The operation plate 385 has a bifurcated shape, and the base end of the operation plate 385 is connected to an E-ring 385 by a connecting shaft 385 a rotatably attached to the sewing machine frame 314.
Stopped by b. An operation plate shaft 386 is caulked at a position below the connection shaft 385a of the operation plate 385,
One end of an operation link 387 is rotatably fixed to the operation plate shaft 386 by an E-ring 387a.

The tail end of the connecting arm 388 has an E-ring 388a.
, And is rotatably connected to the other end of the operation link 387. The base end of the connecting arm 388 is the sewing machine frame 314.
Is screwed to a connection shaft 390 that is rotatably mounted on the shaft.

A connecting gear 391 is fixed to the connecting shaft 390, and meshes with a gear 392a formed on the adjusting cam 392. Adjusting cam 392 has lower knife holder 3
A groove cam 392b (a cam similar to the groove cam 327b in the first and second embodiments of the present invention) for adjusting the left-right position of the shutter 40 is formed, and is fixed to one end of the adjustment shaft 393. Further, similarly to the first and second embodiments of the present invention, the adjusting cam 392 includes the lower knife holder positioning shaft 34.
5 has been inserted. A lower knife holder adjustment knob 394 is fixed to the other end of the adjustment shaft 393. A gear 394 a is formed on the lower knife holder adjustment knob 394, and a click plate 315 which is a leaf spring fixed to the sewing machine frame 314 with a screw is engaged.

The lower knife holder mechanism 34a is a mechanism corresponding to the lower knife holder mechanism 34 in the first and second embodiments of the present invention, and only the differences in configuration will be described below.

That is, a thread slide lever 347 is provided in place of the thread slide lever 341. One end of the lever 347 is rotatably connected to the base end of the thread sliding piece 343, and is urged by a torsion spring 341c as in the first and second embodiments. Thread slide lever 347
The center of the shaft is rotatably attached to the side surface of the lower knife holder 340. The lever 347 is urged by the torsion spring 341a in a direction to store the thread sliding piece 343 in the inoperative position, similarly to the first and second embodiments of the invention.

One end of the lower knife holder shaft 331 is fixed to the lower knife holder 340 in the same manner as in the first and second embodiments, but the other end of the lower knife holder shaft 331 is moved toward the sewing machine frame 314 by a spring 335. It is biased in the retracting direction.

Next, the operation will be described.

When the feed adjusting dial 371 is at the "overcast" position, the operating cam 382 is mounted so that the cam portion 382b is at the top as shown in FIG. At this time, since the operation cam 382 and the operation plate 385 are not in contact with each other, the lower knife holder adjustment knob 394 can be rotated left and right, and the left and right positions of the lower knife holder 340 can be adjusted as desired.

In this case, the thread sliding piece switching cam 384 has a large radius cam in contact with the thread sliding piece lever 347, and the thread sliding piece 343 is pulled out to the operating position (the state of FIG. 20).

When the feed adjusting knob 371 is rotated from the "overlock" direction to the "rolling" direction in order to change the overlock sewing to the winding sewing, as shown in FIG. 385 abuts,
The operation plate 385 rotates clockwise as shown in FIG. With this rotation, the adjusting cam 392 is moved to the click plate 395 via the operation link 387, the connecting arm 388, and the gear 391.
Rotate against the elastic force of Cam part 3 of operation cam 382
When 82b fully pushes the operation plate 385 (FIG. 25),
The groove cam 392b of the adjusting cam 392 is adjusted such that a predetermined winding sewing position of the valley cam comes into contact with the screw head 345a of the lower knife holder positioning shaft 345.

As the operation cam 382 rotates, the projection 382e of the operation cam 382 comes into contact with the projection 380e of the switching shaft guide plate 380 (FIG. 25), and the force for moving the operation cam 382 to the lower knife holder 340 side is applied. Since the guide portion 382d of the operation cam 382 and the operation plate 385 are in contact with each other (the operation plate 385 indicated by a dashed line in FIG. 22), the switching shaft guide plate 380 includes the compression spring 38.
It moves against the elastic force of 1.

At this time, at the same time, the yarn sliding piece switching cam 384
Also rotates, the contact between the cam with a large radius of the thread sliding piece switching cam 384 and the thread sliding piece lever 347 is released, and the spring 341 a
The biasing force causes the lever 347 to rotate, and the thread slide piece switching cam 384 comes into contact with a small-diameter cam, so that the thread slide 343 is stored at the inoperative position.

Feed adjusting cam 372, feed adjusting link 37
The adjustment of the feed pitch by the operation such as 3 is the same as that of the second embodiment of the present invention, and thus the detailed description is omitted.

As described above, in one operation of rotating the feed adjusting dial 371, the feed pitch is set to the winding position, the thread sliding piece 343 is set to the inoperative position, and the lower knife holder 340 is set.
Is changed to the winding sewing position, and the change from the overlock sewing to the winding sewing can be performed.

Next, a description will be given of a change from winding sewing to overlock sewing.

When the feed adjusting dial 371 is at the winding sewing position, as shown in FIG. 26, the cam portion 382a of the operation cam 382 is located above.

Then, when the feed adjusting dial 371 is rotated from the “saw” direction to the “overswing” direction, the operation cam 3
82 rotates as shown in FIG. 27 and then in FIG.
At this time, the protrusion 382e of the operation cam 382 comes into contact with the protrusion 380e of the switching shaft guide plate 380, and the operation cam 382
The cam portion 382a and the operation plate 385 contact each other. FIG.
When the operation cam 382 rotates to the position shown in FIG.
2e and the projection 380e are separated from each other, but are urged by the spring 383 to guide the guide portion 382c of the operation cam 382 and the operation plate 385.
Are in contact with each other (the operation plate 3 indicated by a solid line in FIG. 22).
85), the operation cam 382 and the operation plate 385 are not separated. The cam portion 382a of the operation cam 382 has a cam shape such that the adjustment cam 392 rotates until the lower knife holder 340 moves to the overlocking position, and the lower knife holder 340 moves to the overlocking position (FIG. 3).
0).

At the same time, the contact with the thread sliding piece lever 347 is changed to the larger radius cam of the thread sliding piece switching cam 384, and the thread sliding piece 343 moves to the operating position.

The change of the feed pitch is the same as that of the second embodiment of the present invention, so that the detailed description is omitted.

As described above, the feed adjusting dial 37
In one operation of rotating 1, the feed pitch is shifted to the overlocking position, the thread sliding piece 343 is shifted to the operation position, and the lower knife holder 3 is rotated.
40 can be adjusted to the overlock position.

[0151]

According to the first aspect of the present invention, it is possible to provide a stitching system switching device for an overlock sewing machine, in which the switching operation between the overlock sewing and the winding sewing is simplified and the switching operation is not mistaken. .

According to the invention described in claim 2, according to claim 1
In addition to the effects similar to those of the invention described in (1), the switching of the thread slide and the adjustment of the overlock width can be performed separately from the adjustment of the feed pitch.

According to the third aspect of the present invention, the first aspect
Alternatively, an effect similar to that of the invention described in claim 2 can be obtained.

According to the fourth aspect of the present invention, it is possible to provide a stitching system switching device for an overlock sewing machine, in which the switching operation between the overlock sewing and the winding sewing is simpler than the conventional one and the switching operation is not mistaken.

According to the invention set forth in claim 5, according to claim 4,
The same effect as the invention described in (1) can be obtained.

According to the invention described in claim 6, according to claim 4,
In addition to the effect similar to that of the invention described in (1), it is also possible to adjust only the overlock width separated from the switching of the thread slide and the adjustment of the feed pitch.

According to the seventh aspect of the present invention, it is possible to provide a stitching system switching device for an overlock sewing machine, in which the switching operation between the overlock sewing and the winding sewing is simpler and the switching operation is not mistaken.

In addition, the yarn sliding piece and the overlock width can be adjusted separately from the feed pitch.

According to the invention of claim 8, according to claim 7,
The same effect as the invention described in (1) can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a switching adjustment mechanism and a feed dog driving mechanism of a stitching system switching device of an overlock sewing machine according to a first embodiment of the present invention.

FIG. 2 is a side view of a feed dog driving mechanism of the stitch mode switching device of the overlock sewing machine according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a switching adjustment mechanism and an overlock width adjustment / thread sliding piece switching mechanism of the stitching system switching device of the overlock sewing machine according to the first embodiment of the present invention.

FIG. 4 is a partial side view of an overlock width adjusting / thread sliding piece switching mechanism of the overlock sewing machine switching apparatus according to Embodiment 1 of the present invention;

FIG. 5 is a partially enlarged view of FIG. 3;

FIG. 6 is a partial plan view of an overlock width adjusting / thread sliding piece switching mechanism of the overlock sewing machine switching apparatus according to the first embodiment of the present invention;

FIG. 7 is a partially enlarged perspective view of FIG. 6;

FIG. 8 is a partial side view of the overlock width adjusting / thread sliding piece switching mechanism of the stitching system switching device of the overlock sewing machine according to the first embodiment of the present invention, and FIG. (B) shows a state in which the thread sliding piece is in an inoperative position.

FIG. 9 is a diagram showing an upper knife mechanism of a stitch method switching device of the overlock sewing machine according to the first embodiment of the present invention.

FIG. 10 is a plan view of a needle plate portion of the stitching system switching device of the overlock sewing machine according to the first embodiment of the present invention, wherein (A) is a plan view of the entire needle plate portion, and (B) and (C). ) Is the same partial plan view.

FIG. 11 is a partial perspective view of the overlock sewing machine.

FIG. 12 is a perspective view of an overlock width adjusting / thread sliding piece switching mechanism of the stitching system switching device of the overlock sewing machine according to the second embodiment of the present invention.

FIG. 13 is a plan view of a feed adjustment dial of the stitching system switching device of the overlock sewing machine according to the second embodiment of the present invention.

FIG. 14 is a partially enlarged view of FIG. 12;

FIG. 15 is a partially enlarged view of FIG. 12;

FIG. 16 is a partially enlarged view of FIG. 12;

FIG. 17 is a partially enlarged view of FIG. 12;

FIG. 18 is a diagram for explaining the operation of the stitching system switching device of the overlock sewing machine according to the second embodiment of the present invention.

FIG. 19 is a diagram illustrating the operation of the stitching system switching device of the overlock sewing machine according to the second embodiment of the present invention.

FIG. 20 is a perspective view of an overlock width adjusting / thread sliding piece switching mechanism of the stitching system switching device of the overlock sewing machine according to the third embodiment of the present invention.

FIG. 21 is a plan view of a feed adjustment dial of the stitching system switching device of the overlock sewing machine according to the third embodiment of the present invention.

FIG. 22 is a partially enlarged view of FIG. 20;

FIG. 23 is a diagram illustrating the operation of the stitching system switching device of the overlock sewing machine according to the third embodiment of the present invention.

FIG. 24 is a diagram illustrating the operation of the stitching system switching device of the overlock sewing machine according to the third embodiment of the present invention.

FIG. 25 is a diagram illustrating the operation of the stitching system switching device of the overlock sewing machine according to the third embodiment of the present invention.

FIG. 26 is a diagram illustrating the operation of the stitching system switching device of the overlock sewing machine according to the third embodiment of the present invention.

FIG. 27 is a diagram illustrating the operation of the stitching system switching device of the overlock sewing machine according to the third embodiment of the present invention.

FIG. 28 is a diagram illustrating the operation of the stitching system switching device of the overlock sewing machine according to the third embodiment of the present invention.

FIG. 29 is a diagram illustrating the operation of the stitching system switching device of the overlock sewing machine according to the third embodiment of the present invention.

FIG. 30 is a diagram illustrating the operation of the stitching system switching device of the overlock sewing machine according to the third embodiment of the present invention.

FIG. 31 is a diagram illustrating a seam method of overcasting.

FIG. 32 is a view for explaining a stitch method of winding sewing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switching adjustment mechanism 10 Feed adjustment stepping motor 12 Feed adjustment shaft 2 Feed tooth adjustment mechanism 20 Feed adjuster 3, 3a, 3b Overlock width adjustment / thread sliding piece switching mechanism 300 Working arm 302 Working plate 313 Click plate 320 Gear 321 Adjustment Shaft 322 Operating gear 326 Adjusting knob 327a Cam part 327b Cam part 340 Lower knife holder 341 Thread slider lever 342 Thread slider shaft 343 Thread slider 344 Guide member 345 Lower knife holder positioning shaft 345a Screw 347 Thread slider lever 360 Upper knife holder 370 Shaft 371 Feed adjustment dial 372 Feed adjustment cam 372a Groove cam 375e Projection 376 Operation cam 376a Cam section 376b Cam section 378 Compression spring 382 Operation cam 384 Thread sliding piece operation cam 385 Operation plate 388 Operation link 388 Connection 391 Gear 392 adjusting cam 392a cam portion 393 adjustment shaft

Claims (8)

[Claims] 1. A thread sliding piece, a thread sliding piece switching means for switching the position of the thread sliding piece to a predetermined working position or a predetermined inoperative position, and an overlock width adjusting means for adjusting the overlock width of the sewing material. Feed pitch adjusting means for adjusting the feed pitch of the work; selecting drive means for selecting between edge sewing and winding sewing; driving of the selection drive means, the thread sliding piece switching means, Moving means for interlocking the width adjusting means and the feed pitch adjusting means, and interlockingly moving the respective means to a position suitable for overcasting or winding sewing;
A stitch method switching device for an overlock sewing machine, comprising: 2. The feed pitch adjusting means has a variable area for changing a feed pitch of a sewing object and an invariable area which does not change, and when the feed pitch adjusting means moves in the invariable area, the thread sliding piece switching means. 2. A stitching system switching device for an overlock sewing machine according to claim 1, further comprising: a moving means capable of moving the overlock width adjusting means to a predetermined position. 3. The driving means for driving an operating cam having a plurality of cam portions, a connecting means engageable with the operating cam and connected to the overlock width adjusting means, and a thread sliding piece switching means. And a member that adjusts the width of one of the operation cams that engages with the connection means in accordance with the rotation direction of the feed pitch adjustment means, and drives the drive member to position the thread slide. 2. The stitching system switching device for an overlock sewing machine according to claim 1, wherein the sewing machine is moved to a predetermined position. 4. A thread sliding piece, a thread sliding piece switching means for switching the position of the thread sliding piece to a predetermined working position or a predetermined inoperative position, and an overlock width adjusting means for adjusting the overlock width of the sewing material. Holding means capable of holding the thread sliding piece switching means and overhang width adjusting means at predetermined positions; feed pitch adjusting means for adjusting the feed pitch of the sewing object; and operation of the feed pitch adjusting means. And moving means capable of releasing the holding of the holding means with respect to the thread sliding piece and the overlock width, and capable of moving the thread sliding piece switching means and the overlock width adjusting means to a predetermined position. Stitch system switching device for overlock sewing machines. 5. The moving means comprises: an operating arm connected to feed pitch adjusting means; and an operating plate engageable with a holding means. The stitching system switching device for an overlock sewing machine according to claim 4, wherein the arm and the operation plate are separated by a predetermined amount. 6. The overlock sewing machine according to claim 4, wherein said overlock width adjusting means includes an overlock width independent driving means which is driven independently without operating the feed pitch adjusting means. Method switching device. 7. A thread sliding piece, a thread sliding piece switching means for switching the position of the thread sliding piece to a predetermined operating position or a predetermined inoperative position, and an overlock width adjusting means for adjusting the overlock width of the sewing object. Holding means capable of holding the thread sliding piece switching means and overhang width adjusting means at predetermined positions; feed pitch adjusting means for adjusting the feed pitch of the sewing object; and operation of the feed pitch adjusting means. Moving means capable of releasing the holding of the holding means with respect to the thread sliding piece and the overlock width, and capable of moving the thread sliding piece switching means and the overlock width adjusting means to a predetermined position, The pitch adjusting means has both a variable area for changing the feed pitch of the work and an invariable area that does not change, and holds the holding means with respect to the thread sliding piece and the overlock width when the feed pitch adjusting means moves the invariable area. As well as release, and a moving means capable of moving said darning width adjusting means and the yarn Namerahen switching means to a predetermined position, the stitch method switching apparatus overlock sewing machine. 8. The moving means has an operating cam having a plurality of cam portions, and an operating plate engageable with a holding means, and the moving means moves in accordance with a rotation direction of the feed pitch adjusting means. The stitching system switching device for an overlock sewing machine according to claim 7, further comprising a selection unit that selects any one of the plurality of cam portions of the unit.