JPH0662Y2 - Upholstering machine cloth tensioning device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cloth tensioning device for a boring machine having both functions of a front knife and a rear knife.

[Conventional technology and problems to be solved]

As a conventional overhollow sewing machine capable of overholling a sewing cloth, a front knife type and a rear knife type are known. A series of work processes of the tip knife type overlock sewing machine is in the order of "sewing cloth clamping process", "button hole drilling process", "clothing process", "rapid feed process", "sewing process", and then back. A series of work process of the female type overlock sewing machine is in the order of "clamping process of sewing cloth", "clothing process", "fast-forwarding process", "sewing process", and "button boring process", both of which are There is a difference in the order of the "button punching process".

Thus, conventionally, when one sewing machine has both functions of a front knife and a rear knife, as shown in FIG. 4, the sewing machine operates in the X direction, which is the forward direction of the pair of base plates 2 and 2'in the fast-forwarding process. I was on the move. That is, when the "fast-forwarding step" is given for the "clothing step", the two pairs of rollers 100, 100 ', 10' mounted on the sewing machine main body (not shown) are provided.
The cam surface of each base plate 2, 2'contacts 1, 101 ', and each base plate 2, 2'is orthogonal to the X direction.
It is possible to apply tension to the sewing cloth 3 which is opened in the left-right direction, which is the -Y 'direction, and clamped by the clamp devices 5, 5'on both base plates 2, 2'.

However, in such a conventional cloth tensioning device for a boring machine, a "fast-forwarding step" is required in addition to the "fastening step". There has been a problem that the stroke of the "process" must be increased, and the sewing machine as a whole must be enlarged in order to allow this stroke.

In addition, as a cloth tensioning device for other conventional overlock sewing machines,
The "button tensioning process" is the "clothing process" when the tip knife is used.
(Specifically, a splicer cam 22 'as shown in FIG. 5 is attached to a cutting drive vehicle that operates when the cutting knife is ejected.
Is used to move the spreader lever 18 'forward. ) In addition, the "clothing step" for the rear knife uses the "sewing cloth clamping step" (specifically, the projection fixed to the closing lever 17 'that operates in the "sewing cloth clamping step"). 17'a (see FIG. 6) was used), and a "clothing step" was applied to each.

However, such a conventional cloth tensioning device cannot be applied as it is to a sewing machine that also serves as a front knife and a rear knife. That is, in the cloth tensioning device for the front knife, the "clothing process" cannot be performed after the "clamping process of the sewing cloth" at the time of overholing the rear knife, and in the cloth tensioning device for the rear knife, At the time of sewing over-holes of the tip knife, the "clothing process" is performed before the "button hole drilling process".

[Means for Solving the Problems]

The present invention has been made in view of the above-mentioned conventional problems, and provides a tapper sewing machine that can be used both as a front muzzle and a rear knife. The work clamp has a structure that is slidably supported in the front-rear direction on a sewing machine main body. A carrier and a pair of clamp devices, respectively, are mounted on the upper surface of the work clamp carrier so as to be movable in the left-right direction, and are urged by springs in the closing direction. A closing lever which is swingably supported and swings to one side to perform a clamp operation of the clamping device, an operating member which is integrated with the closing lever, and a spreader which is slidably supported in the front and rear direction on the sewing machine main body. A lever and a middle portion are rotatably supported by the spreader lever, and are biased rearward by a return spring and the front end is attached to one side. In the free state, the other surface of the rear portion is engageable with one surface of the operating member of the closing lever in the inactive swing state, and the rear end portion is engageable with the stepped front surface of the operating member in the swing operation state. The operating claw, a cutting arm that is supported by the sewing machine body so as to be swingable in the left-right direction, and has a sloped surface that pushes up the front end of the operating claw when swinging toward the operating claw, and the spreader. A cam member that is provided so as to face the rear end of the lever and that moves in the front-rear direction, is arranged below the pair of base plates in parallel and inward movement is constrained, and extends in the front-rear direction to extend in one direction. A pair of spliner connecting members whose rear end faces the front end of the spreader lever and front ends of both spliner connecting members are relatively swingably connected, and a central part is swingably connected to the work clamp carrier. Was done Upholstery sewing of an overlock sewing machine including a hook member and a pair of link mechanisms that are interposed between an intermediate portion of each spreader connecting member and each base plate and that open and operate a pair of base plates by forward movement of one spreader connecting member. It is a device.

[Action]

When the cloth tensioning device for this holing machine is used as a tip knife type, a series of work steps of the hooking type boring machine of the tip knife type are "sewing cloth clamping step", "button hole punching step", "cloth tensioning". "Process", "fast-forward process", "sewing process"
First, the closing lever is swung sufficiently in one direction, and the sewing machine is clamped in conjunction with each other to clamp the sewing cloth on each base plate. At that time, the relationship between the operating member of the closing lever and the operating pawl is changed from a state in which the rear surface of the operating pawl contacts one surface of the operating member to a state in which the rear portion of the operating pawl is locked to the stepped front surface of the operating member. And transition.

Next, when the cutting arm is rotated by moving to the "button hole forming process", the inclined surface portion of the cutting arm pushes up the front end portion of the operating pawl. As a result, the operating claw moves to a position that avoids interference with the operating member of the closing lever, and in this state, the closing lever is swung in the other direction to return to the original position. Then, a button hole is drilled in the sewing cloth by the cutter, and immediately after the cutting is completed, if the spreader lever is pushed forward by the cam member, one spreader connecting member is moved forward and the other spreader connecting member is connected. Since the members are respectively moved in the rearward direction, opening operation is given to both base plates via the link mechanism. As a result, the sewing cloth already clamped by the clamp device is opened, and the "clothing step" is completed.

On the other hand, when it is used as a rear knife type, the series of work processes of the rear knife type overlock sewing machine are "clamping process of sewing cloth", "cloth tensioning process", "fast-forwarding process", "sewing process". Since the order is "the button boring process", first, similar to the work process of the tapper sewing machine of the front knife type, the closing lever is swung in one direction and the clamp device is interlocked with the sewing cloth on each base plate. Clamp to.

Then, since the cutting arm is not cut, the closing lever is swung in the other direction to return to the original position. At that time, the stepped front surface of the actuating member pushes the rear end of the actuating claw forward, and the spreader lever integrally pushes forward, so as described above, an opening operation is given to both base plates via the link mechanism. . As a result, the sewing cloth already clamped by the clamp device is opened, and the "clothing step" is completed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

In the figure, reference numeral 1 is a work clamp carrier,
The carrier 1 is slidably supported in a sewing machine body (not shown) in the XX 'direction, that is, in the front-back direction, and functions as a pedestal for a pair of base plates 2 and 2'described later.
Feed is applied to the sewing cloth 3 on the base plates 2 and 2 '.
The pair of base plates 2, 2'is mounted on the upper surface of the work clamp carrier 1 so as to be movable in the YY 'axis direction, that is, the left-right direction, and is wound between the main body of the sewing machine and the spiral springs 4, 4'. ′ Is always urged in the closing direction and is provided with clamping devices 5 and 5 ′ for clamping the sewing cloth 3, respectively.

Reference numerals 6 and 6'represent spliner connecting members which are arranged in parallel below the work clamp carrier 1 in association with the pair of base plates 2 and 2 ', respectively.
It extends in the X'direction, and the central portions are connected links 7,
The work clamp carrier 1 is swingably supported by step screws 8 and 8'via 7 '. Specifically, the outer ends of the connecting links 7 and 7'are respectively formed by the rocking members 9 and 7.
9'and stepped screws 8, 8'to spreader connecting member 6,
6'is pin-coupled, and each inner end has a step screw 30, 30 '.
In the state shown in FIG. 1 in which both spliner connecting members 6 and 6'are returned to the work clamp carrier 1 by
The inner end of one of the connecting links 7 is inclined in the X direction,
The inner end of the other connecting link 7'is inclined in the X'direction. The outer ends of the rocking members 9, 9'incline in the same direction as the inner ends of the connecting links 7, 7 ', and the cams 13, 13' and the pins 14, 14 'are fixedly installed. Pin 1
4, 14 'are engaged and guided in grooves 15, 15' extending to the left and right of the work clamp carrier 1, and the cams 13, 13 'are engaged with adjusting screws 16, 16' of the base plates 2, 2 '. . The adjusting screws 16 and 16 'are fixed to the base plates 2 and 2'by adjusting the position in the YY' axis direction. With these, each spreader connecting member 6,
A pair of link mechanisms that are interposed between the intermediate portion of 6'and each of the base plates 2 and 2'to open and actuate the pair of base plates 2 and 2'by the forward movement of one spreader connecting member 6 is configured. Reference numeral 10 denotes a link member which is urged by a return spring 31 stretched between the work clamp carrier 1 and extends in the Y-Y'-axis direction in a normal state. The front end portion is pivotally connected to each other by pins, and the center portion is pivotally supported by the work clamp carrier 1 by a pin 11.
Reference numeral 12 is a spreader plate fixed to the rear end portion of one spreader connecting member 6.

Then, the spreader plate 1 is resisted against the return spring 31.
When 2 is pushed in in the X direction, the link member 10 swings around the pin 11 as a fulcrum, one spreader connecting member 6 moves in the X direction, and the other spreader connecting member 6'moves in the X'direction. Each connecting link 7, 7'has a step screw 8,
8 ', 30, 30' are oscillated to urge the central portions of both spliner coupling members 6, 6'to the outside and the oscillating members 9, 9'are provided with pins 14, 14 'in grooves 15 , 15 '
The base plates 2, 2 are swung while being guided by the cams 13, 13 'which are engaged with the adjusting screws 16, 16'.
Expand 2 '. In this way, each connecting link 7, 7 '
Are both base plates 2 by the swinging members 9, 9 '.
There is a function to assist the 2'opening operation.

In FIG. 2, reference numeral 17 is a closing lever which is swingably supported in the sewing machine body in the ZZ 'axis direction, that is, in the vertical direction about the YY' axis orthogonal to the XX 'direction. It swings in the Z direction, that is, downward from the return state shown in FIG. And the closing lever 17
An actuating member 17a is integrally fixed to the unit by means of a position-adjustable unit (long hole and set screw) in the XX 'direction.

Reference numeral 18 denotes a spreader lever slidably supported in the sewing machine main body in the XX 'direction. As shown in FIG. 2, a roller 18a is attached to the rear end portion of the spreader lever, and a front end portion thereof is provided with a position adjustment in the front-rear direction. The adjusting plate 18b is attached by means capable of controlling the adjusting plate 18b, and the adjusting plate 18b faces the rear surface of the spreader plate 12 so that the spreader plate 12 can be pushed in the X direction. An intermediate portion of the operating claw 19 is swingably supported by a pin 20 at the center of the spreader lever 18, and the operating claw 19 is stretched between the front end of the operating claw 19 and the sewing machine main body. A return spring 21 composed of a tension coil spring is constantly urged downward and forward. Therefore, the operating claw 19 returns to the rear end position together with the spreader lever 18 in the free state pulled by the return spring 21, and the rear upper surface 19a of the closing lever 17 returns to the upward swinging state. Actuating member 17a
The rear end of the operating member 17a of the closing lever 17, which is in contact with the lower surface 17b of the lower lever 17b, is engaged with the rear end (see FIGS. 3 (1) and 3 (2)). .

Reference numeral 22 denotes a cam member attached to a cutting drive wheel (not shown), which is attached to a cutting shaft U-U 'extending in the same direction as the YY' axis. Therefore, the cam member 22 is connected to the spider lever 18
When the cutting shaft U-U 'is rotated to perform a cutting operation (after cutting with a knife), it is moved in the front direction and returns to the rear direction after the cutting operation is completed.

Reference numeral 23 denotes a cutting arm supported by the sewing machine main body so as to be capable of swinging about the Z-Z 'axis. When the cutting arm is swung in the right (Y') direction from the return state shown in FIG. A cutting arm extension 23b having an inclined surface portion 23a for pushing up the front end portion of 19 is fixed by a screw 24. Then, the cutting arm 23
When the rocking member swings to the right and pushes up the front end portion of the operating pawl 19, the rear upper surface 19a and the rear end portion of the operating pawl 19 do not interfere with the operating member 17a.

Next, the operation will be described.

When used as a tip knife type, the series of work steps of the tapper sewing machine of the tip knife type are "clamping process of sewing cloth", "button punching process", "clothing process", "fast-forward process", " Since the order is the "sewing process", first, the closing lever 17 swings sufficiently downward to interlock the clamping devices 5 and 5'to clamp the sewing cloth 3 on the base plates 2 and 2 '. At this time, the relationship between the closing lever 17 and the operating claw 19 of the closing lever 17 is that the rear upper surface 19a shown in FIG.
The state in which the rear upper edge shown in FIG. 3 (2) is in contact with the lower surface 17b of FIG. 3 shifts to the state in which the stepped front surface 17c of the operating member 17a is locked.

Next, move to the "button drilling process", where the cutting axis U
When the cutting arm 23 is rotated in the right direction (arrow A) while giving one rotation to -U ', the inclined surface portion 23a of the cutting arm extension 23b pushes up the front end portion of the operating pawl 19. As a result, the operating claw 19 is moved to the position shown in FIG.
As shown in (3), the operating member 1 of the closing lever 17
It moves to a position avoiding interference with 7a, and in this state, the closing lever 17 swings upward and returns to the original position.
On the other hand, a button hole is drilled in the sewing cloth 3 by a cutter (not shown) that is interlocked with the cutting axis U-U ', and immediately after cutting is completed (cutting axis U-U' is 1
Just before the rotation), the cam member 22 causes the roller 18 to
a is pushed forward, and the rear surface of the spreader plate 12 is pushed in the X direction by the adjusting plate 18b, and as described above, one spliner connecting member 6 is moved in the X direction and the other spliner connecting member 6'is moved to X '. The pair of swing members 9, 9'and the pair of connecting links 7, 7'are swung to move the base plates 2, 2'to open. As a result, the sewing cloth 3 clamped by the clamp devices 5 and 5'is opened, and the "clothing step" is completed.

Next, the "fast-forwarding process" and the "sewing process" are sequentially performed, and the sewing cloth 3 is subjected to predetermined buttonhole oversewing.

On the other hand, when it is used as a rear knife type, the series of work processes of the rear knife type overlock sewing machine are "clamping process of sewing cloth", "cloth tensioning process", "fast-forwarding process", "sewing process". Since the order is "the button boring process", first, the closing lever 17 is sufficiently swung downward to interlock the clamping devices 5 and 5 ', as in the working process of the front knife type boring machine. And clamp the sewing cloth 3 on each base plate 2, 2 '.

Then, because it does not cut, cutting arm 2
3, the closing lever 17 swings upward from the state of FIG. 3 (2) and returns to the original position. At this time, the stepped front surface 17c of the actuating member 17a pushes the rear end of the actuating claw 19 forward and pushes the spreader lever 18 integrally in the X direction, so that the adjusting plate 18b moves the spreader plate 12 in the same direction. Both base plates 2, 2'via extrusion, the splicer connecting members 6, 6 ', the link member 10, the connecting links 7, 7'and the swinging members 9, 9'.
Give the opening operation to. As a result, the clamp devices 5, 5 '
The sewing cloth 3 already clamped by is opened, and the "clothing step" is completed. Then, a "fast-forward process", a "sewing process" and a "button hole forming process" are sequentially performed.

[Effect of device]

As will be understood from the above description, according to the present invention, in the overlock sewing machine having both the functions of the front knife and the rear knife, the “cloth sewing process” and the “button hole drilling process” are associated with each other. Since the "tensioning step" is executed, the "clothing step" can be automatically incorporated in an appropriate place by sequentially performing the steps other than the "clothing step" of the front knife and the rear knife. Moreover, since it is not necessary to give the work clamp carrier a large amount of movement dedicated to the "clothing process", downsizing of the boring machine, shortening of the "clothing process" time and durability of the sliding contact part of the work clamp carrier It is possible to obtain a practically excellent effect that the property can be improved. In addition, when this boring sewing machine is automated, the "clothing process" can be set only by the switching operation of the front knife or the rear knife, so it is not necessary to change the setting of the "clothing process" separately. Not only is the switching operation simple, but it is possible to prevent accidents such as forgetting to change the setting of the "clothing process" when switching the front knife or the rear knife and damaging the sewing machine and the sewing cloth. Is obtained.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is an exploded perspective view showing essential parts of a boring machine, and FIG. 2 is a perspective view showing a closing lever, a spreader lever and a cutting arm. 3 (1), (2) and (3) are explanatory views of the operation, respectively, FIG. 4 is a perspective view showing a conventional base plate, FIG. 5 is a perspective view showing a conventional spreader lever, and FIG. FIG. 6 is a perspective view showing a conventional cutting arm. 1: Work clamp carrier, 2, 2 ': Base plate, 3: Sewing cloth, 4, 4': Spring, 5, 5 ': Clamping device, 6, 6': Spreader connecting member, 7: Connecting link, 9, 9 ′: Rocking member, 10: link member, 11: pin, 13, 13 ′: cam, 14, 14 ′: pin, 15,
15 ': groove, 16, 16': adjusting screw, 17: closing lever, 17a: operating member, 17b: lower surface (one surface), 17c: stepped front surface, 18: spreader lever,
18a: roller, 18b: adjusting plate, 19: operating claw, 19
a: rear upper surface (rear other surface), 20: pin, 21: return spring, 22: cam member, 23: cutting arm, 23
a: inclined surface portion, 30, 30 ': stepped screw, 31: return spring, U-U': cutting shaft.

Claims (1)

[Scope of utility model registration request] 1. A work clamp carrier slidably supported in a front-back direction on a sewing machine main body, and a clamp device, respectively. The work clamp carrier is mounted on an upper surface of the work clamp carrier so as to be movable in the left-right direction and in a closing direction. A pair of base plates that are respectively biased by springs, a sewing lever that is swingably supported in the up-down direction, and a closing lever that swings to one side to clamp the clamping device; and a closing lever integrated with the closing lever. An operating member, a spliner lever slidably supported in the longitudinal direction of the sewing machine main body, an intermediate portion rotatably supported by the spreader lever, and biased rearward by a return spring. In the free state, the front end portion is biased to one side, and the other surface of the rear portion engages with the lower surface of the operating member of the closing lever in the inactive swing state, and the rear end portion swings. An operating claw that can be engaged with the stepped front surface of the operating member in an operating state, and a front end of the operating claw that is supported by the sewing machine body so as to be swingable in the left-right direction and swings toward the operating claw A cutting arm having an inclined surface portion that pushes up the portion, a cam member that is provided so as to face the rear end portion of the spreader lever and that moves in the front-rear direction, and a pair of base plates that move in parallel and inwardly downward. A pair of spliner connecting members, which are arranged so as to be constrained and extend in the front-rear direction, and one rear end portion of which is opposed to the front end portion of the spreader lever, and the front end portions of both spliner connecting members are relatively swingably connected. The center portion of the splicer connecting member is pivotally connected to the work clamp carrier, and the middle portion of each spliner connecting member is interposed between each base plate. Upholstered apparatus stitching machine, characterized in that it comprises a pair of link mechanisms for actuating opening a pair of base plates by movement.