JPS6334631Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an automatic guide device for a workpiece material in a sewing machine, and more particularly, to an automatic guide device for a workpiece material in a sewing machine, and in particular to an automatic guiding device for a workpiece material in a sewing machine. The present invention relates to an automatic guide device that can be easily changed depending on the properties of the processed material.

Prior Art In order to form a seam at a predetermined position from the side edge of a workpiece material that can be sewn, such as a cloth or sheet, along the side edge of the workpiece material at the seam forming point, A detection device that is disposed on the front side in the feeding direction and detects the deviation of the side edge of the workpiece material from the reference position, and a detection device that detects the deviation of the side edge of the workpiece material from the reference position; a rotating shaft rotatably arranged around an axis substantially parallel to the feeding direction so as to be able to engage with the feed direction; An automatic guide device for a workpiece is provided, comprising a rotary drive means operatively connected to and rotationally driving the rotary wheel to move the workpiece. The rotating wheels in such devices are within the range in which the workpiece material can be moved in a direction that intersects with the feed direction, and do not cause wrinkles or distortion to the workpiece material as it moves in the feed direction. In order to prevent defects such as misaligned stitches and uneven stitch pitches, it is desirable to slide and engage the workpiece material with as little pressing force as possible.

Problems to be Solved by the Invention However, such conventional automatic guide devices are generally configured such that the rotating ring is pressed against the workpiece material by a pneumatic cylinder. For example, there is a device described in Japanese Patent Laid-open No. 51-52049. With such a device, by operating a manual pressure adjustment valve, it is easy to finely adjust the pressure supplied to the pneumatic cylinder according to the thickness, hardness, material quality, etc. of the material to be processed. However, considerable skill is required to operate the pressure regulating valve to set the pressing force (engagement pressure) of the rotary ring against the workpiece material, and at the same time, the reproducibility of the set pressing force against the workpiece material is difficult. I had the inconvenience of not being able to get enough. In particular, such inconvenience becomes noticeable when it is necessary to subtly change the pressing force of the rotary wheel in response to changes in the properties of the material to be processed during the sewing operation. Moreover, it is necessary to install pneumatic equipment such as a pneumatic pump, pneumatic piping, filter, lubricator, switching valve, pressure regulating valve, and pneumatic cylinder, which makes the equipment large and complicated. The disadvantage was that it generated noise.

On the other hand, in connection with the operation of the engagement pressure, in order to easily change the pressure supplied to the pneumatic cylinder, there is provided a plurality of types of pressure reducing valves whose pressures are set in stages, and a switching valve for selecting among them. However, since such a device requires a large number of pressure reducing valves and switching valves corresponding to the types of set pressures, the device is larger and requires a larger number of switching valves. It is expensive and impractical.

Purpose The present invention was developed against the background of the above-mentioned circumstances, and its purpose is to adjust the pressing force of the rotating wheel that presses against the material to be processed, depending on the properties of the material to be processed. In addition, it is possible to set a large number of stages very easily even during sewing work, and the pressing force of the rotating wheel can be equally reproduced for workpiece materials having the same properties. An object of the present invention is to provide a small-sized automatic guide device for workpiece materials.

Solution In order to achieve such an object, the gist of the present invention is to arrange seam forming points movable individually along the direction crossing the feed direction on the front side of the feed direction of the workpiece material. a pair of detection devices for detecting deviations from respective reference positions of the side edges of the upper and lower two workpiece materials sent toward the seam forming point; A separating plate for separating the seam forming point in the forward direction in the feed direction, and two upper and lower workpiece materials in a direction intersecting the feed direction of the workpiece materials based on a detection signal from the detection device. a pair of rotary wheels that are rotatable about axes substantially parallel to the feed direction and arranged oppositely with the separating plate in between so as to be able to engage with the workpiece materials for movement; The sewing machine is equipped with a sewing machine that automatically stitches the upper and lower workpieces by forming continuous seams at predetermined positions from each side edge of the upper and lower workpieces. The automatic guide device includes a rod that is provided to be movable back and forth along its own axis, and a spring that applies elastic force to the rod, and is operatively connected to each of the rotating wheels at one end in the axial direction. a pair of elastic devices, each operatively connected to the other end of the pair of elastic devices in the axial direction, and presses or pulls the other end in response to a supplied drive signal to make the spring elastic. A pair of step-driveable pulse motors are provided for deforming the rotary wheel and changing the engagement pressure of the rotary wheel with respect to the separating plate in stages.

Effects of the invention According to the above method, the amount of elastic deformation of the springs of the pair of elastic devices can be changed in multiple stages in response to the operation of a pair of step-driveable pulse motors, and the elastic deformation amount corresponding to the amount of elastic deformation can be changed. A force is applied to a pair of rotary wheels operably connected to the elastic device, and the engagement pressure of the rotary wheels can be easily and finely adjusted. Therefore, compared to the conventional device in which the engagement pressure of the rotary ring to the workpiece is changed by manually adjusting the air pressure supplied to the pneumatic cylinder, this device has a pair of rotary wheels and two upper and lower sheets. The engagement pressure between the material to be processed and the material to be processed can be adjusted very easily according to its properties, improving the quality of the sewing product. It can be made similar, and sufficient reproducibility of the pressing force can be obtained. Moreover, compared to conventional automatic guide devices that use pneumatic cylinders to urge rotating wheels, there is no need to install various pneumatic equipment, so the device is compact and simple to configure, and can be easily connected to the pneumatic circuit. Various problems associated with the exhaust of air are completely eliminated.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In Figures 1 and 2, sewing machine arm 1
A spacer plate 16 on which a longitudinal box-shaped housing 14 extending along the sewing machine arm 10 is placed, and a mounting block 18 are fixed on the bed 12 at the lower position. On the mounting block 18 there are two protrusions 2 extending parallel to the sewing machine arm 10.
1 and 23 are provided, and those protrusions 21,
A groove 22 sandwiched between grooves 23 is formed. A groove 20 is formed in the lower surface of the housing 14 in a direction perpendicular to its longitudinal direction, into which the mounting block 18 is fitted and an intermediate wall 24 depending within the groove 22 is formed. By fitting the lower end of the housing 14 into the bed 1
It is positioned at a predetermined position on 2. and,
A horizontal pin 26 is fixed in the groove 22, and a rotating shaft 32 having a hook 28 and a mounting lever 30 at both ends, which can be engaged with the horizontal pin 26, is provided at the bottom of the housing 14. Mounting lever 3
The housing 14 is moved to the bed 1 by the rotation operation at step 0.
2 so that it can be fixed on top.

The housing 14 has an open end that opens toward the front side (upstream side) in the feed direction of the workpiece material based on the feed movement of the feed dog 35 with respect to the stitch forming point on the bed 12, that is, the drop point of the sewing needle 34. The upper plate 36, the separating plate 38, the upper arm 40, and the lower arm 42 are installed in the housing 14 with the upper plate 36, the separating plate 38, the upper arm 40, and the lower arm 42 respectively protruding from the inside of the open end thereof.

The separating plate 38 is a thin metal plate that separates the two workpiece materials into upper and lower parts. The upper plate 36 is provided with a notch 44 that allows the tip of the upper arm 40 to engage with the workpiece material on the separation plate 38, and is stacked on the separation plate 38 with a predetermined gap to hold the workpiece material. It is a plate-shaped body made of synthetic resin that provides guidance. Both the separation plate 38 and the upper plate 36 are connected to the upper slide plate 4.
6 is supported in a cantilevered manner. Housing 14
Inside, the upper slide plate 46 and the lower slide plate 48 are formed on the inner wall surface of the housing 14 along the longitudinal direction from the open end of the housing 14 and facing each other, as shown in detail in FIG. The slide grooves 50 are fitted into the pair of slide grooves 50 in a mutually overlapping state, and are supported so as to be freely movable in the direction of the slide grooves 50 (horizontal direction). Racks 52 and 5 are provided on the upper surfaces of the upper slide plate 46 and the lower slide plate 48, respectively.
4 are fixed, and their racks 52,
54 includes an upper slide knob 56 and a lower slide knob 58, respectively, and a pinion fixed to an inner rotary shaft 60 and a cylindrical outer rotary shaft 62, which are coaxially located and rotatably supported by the housing 14, respectively. 64 and 66 are engaged. Further, on both circular sides of the lower slide knob 58, there are numerous grooves 5 extending radially from the center of rotation.
8a and 58b are formed. Therefore, the upper slide knob 56 and the lower slide knob 58
According to the operation, the upper slide plate 46 and the lower slide plate 48 are moved independently. In addition, 68 is a friction member provided in the housing 14 and slidably engaged with the groove 58a according to the biasing force of a spring in order to provide a certain rotational resistance to the lower slide knob 58 and prevent it from freely rotating. It is. Further, 70 provides rotational resistance between the lower slide knob 58 and the upper slide knob 56 that is smaller than the rotational resistance by the friction member 68 so that the upper slide knob 56 rotates together with the lower slide knob 58, and the upper slide knob 56 rotates with the lower slide knob 58. 56, the groove 58 of the lower slide knob 58 is moved according to the biasing force of the spring provided in the upper slide knob 56.
This is a friction member that is slidably connected and engaged with b.

In FIGS. 1 and 4, the upper plate 36 includes
A reflective photoelectric device 72, which is a detection device for detecting the deviation of the side edge of the upper workpiece material from the reference position, is attached facing the separation plate 38, and the lower slide plate 48 is equipped with a reflection type photoelectric device 72 that detects the deviation of the side edge of the upper workpiece material from the reference position. A photoelectric device 74 is attached to detect the deviation of the side edge from the reference position. Therefore, the position at which the side edge of the upper workpiece material sandwiched between the separation plate 38 and the upper plate 36 is detected by operating the upper slide knob 56 is set relative to the feeding direction of the workpiece material. It can be moved to a desired position along the intersecting direction, and the lower workpiece material sandwiched between the spacer plate 16 and the separation plate 38 on the bed 12 can be moved by operating the lower slide knob 58. The detection position of the side edge and the side edge of the upper workpiece material can be simultaneously adjusted to the desired position. The photoelectric devices 72 and 74 are located in front of the dropping point of the sewing needle 34, and are each equipped with two pairs of light emitters (light emitting diodes) and light receivers (phototransistors).
The reflected light from the separating plate 38 that enters the receiver located on the side) is blocked by the workpiece material, and the reflected light from the separating plate 38 enters the receiver located on the side where the fabric is bitten (housing 14 side). By this, the reference position of the side edge of the workpiece material is detected. In other words, when viewed from directly above,
The reference position is midway between the light receivers.

The separation plate 38 and the upper plate 36 are supported by the upper slide plate 46 via a gap adjustment device 76 which is a gap changing means, and between the upper plate 36 and the separation plate 38,
and the separation plate 38 and the spacer plate 1 on the bed 12
6 is adjusted according to the thickness of the material to be processed sandwiched between the gaps. As shown in detail in FIGS. 4 and 5, a support block 78 is fixed to the end of the upper slide plate 46, and this support block 78 has two support blocks extending vertically.
Through holes 80 and 82 are formed. A female thread is formed in the through hole 80, and a screw shaft 86 having a lower gap adjustment knob 84 at the upper end is screwed into the through hole 80. The upper plate 36 is attached to the screw shaft 86.
A step portion 90 is formed which slidably penetrates the separation plate support plate 8, and a flange 90a is formed at the lower end of the step portion 90, and a flange 90a is formed at the lower end of the step portion 90.
A stepped screw 91 for holding 8 is screwed from below. The separation plate 38 and the separation plate support plate 88 are riveted together by the head of an inverted male screw 92, and the male screw 92 is inserted into the through hole 82 and has an upper gap adjustment knob 94 fixed to its upper end. It is screwed onto the lower end of the rotating shaft 96. The lower end of the rotating shaft 96 passes through the upper plate 36 so as to be rotatable around the axis, and a flange 96a that engages with and lifts the upper plate 36 is formed at the lower end. Therefore, as the lower gap adjustment knob 84 is rotated, the screw shaft 86 moves up and down relative to the support block 78, so that the flange 90a formed on the screw shaft 86 and the step screw 9
The separation plate support plate 88 held between the spacer plates 1 and the separation plate 38 fixed thereto are moved up and down relative to the bed 12, and the gap between the spacer plate 16 and the separation plate 38 is adjusted. . At this time, the flange 96a of the rotating shaft 96 that is screwed into the male screw 92 riveted to the separation plate support plate 88 is moved up and down, and the upper plate 36 that is engaged with the flange 96a is also moved up and down. However, since both the separation plate 38 and the upper plate 36 are moved up and down by the same amount, the gap between them does not change. And the upper gap adjustment knob 94
As the is rotated, the upper plate 36 that engages with the rotating shaft 96 is moved up and down relative to the separating plate support plate 88 by the male screw 92 that is threaded onto the rotating shaft 96, and the separating plate 38 and the upper plate 36 is adjusted, but the gap between the spacer plate 16 and the separation plate 38 is not adjusted. Note that 98 is a detent spring that engages with the lower gap adjustment knob 84 and the upper gap adjustment knob 94 to prevent them from freely rotating. Further, 100 is a restraining ring fixed to the rotating shaft 96 to suppress the upper plate 36, and 101 is a restraining ring that is fixed to the rotating shaft 96 to suppress the upper plate 36, and 101 is a separating plate support plate 88 when the gap is adjusted by rotating the upper and lower gap adjusting knobs 84, 94 of the gap adjusting device 76. and a guide pin for guiding the upper plate 36 to move it up and down and to prevent its rotation.

Gap between upper plate 36 and separation plate 38 and separation plate 8
Regardless of the change in the gap between the spacer plate 8 and the spacer plate 16 on the bed 12, the guide pins 102 and 104 that contact and guide the side edges of the workpiece are attached to the separation plate support plate 88 and the guide pin support member 106. It is provided. The guide pin 102 has a cylindrical shape, and its base end is connected to the separation plate 38 and the separation plate support plate 8.
8 and inserted into a hole 108 formed in the upper plate 36. Therefore, regardless of the change in the gap between the separation plate 38 and the upper plate 36, the guide pin 102 is inserted into the hole 108, so that the side edge of the workpiece material is closer to the housing 14 than the guide pin 102. I never reach that point. Further, the guide pin 104 is inserted into a hole 112 formed in the guide pin support member 106 at a position coaxial with the hole 108, and its lower end abuts a leaf spring 114 fixed to the lower side of the guide pin support member 106. It is pushed up close to the ground. Therefore, the separation plate 38
Regardless of the change in the gap between the guide pin 104 and the spacer plate 16 on the bed 12, the upper end of the guide pin 104
Since the guide pin 104 is in contact with the guide pin 104, the side edge of the workpiece material does not exceed the guide pin 104. Note that the guide pins 102 and 104 are arranged so as to be located approximately on the side where the housing 14 is located (the side where the fabric bites) rather than on a straight line that passes through the reference position and extends parallel to the feeding direction of the workpiece material. . Also,
The guide pin support member 106, the leaf spring 114, the guide pin 104, and the distal end portion of the lower arm 42 mentioned above are formed by the spacer plate 16 placed on the bed 12 and the recessed part 116 provided on the surface of the bed 12. It is housed within a space.

As shown in detail in FIG.
An L-shaped plate-shaped guide 118 for guiding the side edge of the workpiece material is disposed near the front side of the falling point, parallel to the feeding direction of the workpiece material, and on a straight line passing through the reference position. ing. The guide 118 is
It is fixed to the end of a horizontal slide rod 120 via a guide holder 122, and the slide rod 120 is slidably fitted into a hole in a rod support member 124 fixed to the upper slide plate 46 to support its axial movement freely. By this, it is possible to move in a direction substantially perpendicular to the feeding direction of the workpiece material. The coil spring 126 inserted between the rod support member 124 and the guide holder 122 causes the stepped portion 123 provided on the guide holder 122 to move toward the workpiece material side of the upper slide plate 46 and the lower slide plate 48. It is always brought into contact with one or both of stoppers 128 and 129 formed at the end.

Therefore, the upper and lower slide knobs 56 and 58
The upper and lower slide plates 46, 48 are rotated
When one of the stoppers 128 and 129 is moved and adjusted in accordance with the movement of the guide holder 122, as shown in FIG.
23, and the guide 118 is positioned. At this time, for example, when performing see-through sewing (sew two pieces of workpieces together by changing the distance from their side edges), the upper and lower slide knobs 56, 58 are separately operated by the operator, and of the stoppers 128, 129, the stopper 128 is moved to a position further to the right in the figure than the stopper 129, so that the position of the guide 118 is determined by the stopper 128 provided on the lower slide plate 48. In other words, when performing see-through sewing, etc., the guide 118
The guide is configured to guide the side edge of the one of the two workpieces having the larger seam allowance.

Returning to FIGS. 1 and 2, the housing 14
Inside, an upper guide device and a lower guide device are provided that engage with the workpiece material while allowing movement in the feed direction and move the workpiece material in a direction substantially perpendicular to the feed direction. The upper guide device includes an upper arm 40 having a rotary ring 130 at its tip that rotates around an axis substantially parallel to the feeding direction of the workpiece material.
, a step-driveable pulse motor 134 that rotates the upper arm 40, and a pulse motor 13.
4 to the upper arm 40. Similarly, the lower guide device includes a lower arm 42 having a rotating ring 132 at its tip.
, a step-driveable pulse motor 138 that rotates the lower arm 42 , and a pulse motor 13 .
The elastic link 140 elastically transmits the driving force of 8 to the lower arm 42.

The upper arm 40 is located within the housing 14.
It is supported by a pin 141 so as to be rotatable in a plane perpendicular to the feeding direction of the workpiece material, and the workpiece is placed between the rotating wheel 130 provided at the tip of the pin 141 and the separating plate 38. The rotary wheel 130 is adapted to engage with the material to be processed while holding the material therebetween.

A servo motor 142 is installed at the base end of the upper arm 40.
and a reduction gear 14 fixed to the base end of a drive shaft 144 extending longitudinally within the upper arm 40.
6 and a small gear (not shown) of a servo motor 142 are meshed with each other. As shown in FIGS. 7 and 8, the distal end of the upper arm 40 accommodates the rotary ring 130 with outer peripheral teeth 147 facing slightly downward by about 1 mm, and also extends toward the distal end and downward. The rotary wheel 130 is provided with an opening cutout 148 and
A gear holder 152 rotatably supports a gear shaft 150 to which a gear shaft 150 is fixed and is substantially parallel to the feed direction of the workpiece material.
is fixed by two screws 154. A bevel gear 156 formed at the shaft end of the gear shaft 150
and a bevel gear 158 formed at the tip of the drive shaft 144.
The rotating wheel 130 and the servo motor 142 are operatively connected. A hole 160 formed in the gear holder 152 for inserting the screw 154 screwed into the upper arm 40.
has an appropriate margin than the outer diameter of the screw 154, and by changing the mounting position of the gear holder 152 with respect to the upper arm 40, the bevel gear 15
6,158 It is advantageous that the mutual engagement setting position can be finely adjusted.

A notch 162 that opens on three sides is formed at the tip of the upper arm 40 to accommodate the bevel gear 158, and when the gear holder 152 is attached, the bevel gears 156, 158 can be stored and the bevel gears 156 and 158 can be accommodated. Gear chamber 164 that opens toward the tip of arm 40
is formed. Then, it closes the lower opening of the gear chamber 164 and slightly (approximately 1 mm)
A cover 168 is fixed to the upper arm 40, and is a plate material having an L-shaped cross section and a spring portion 166 cut and raised. Note that a cover member 169 made of rubber or resin is fitted into the opening on the tip side of the gear chamber 164 to close the gear chamber 164. Therefore, apart from the rotating wheel 130 exposed for engaging the workpiece material, the bevel gear 156,
158 is stored in the gear chamber 164, foreign matter such as lint and dirt is prevented from getting caught between the bevel gears 156 and 158, eliminating misalignment of the meshing position and deformation of the gear shaft 150 and the drive shaft 144. There is an advantage that Further, since a spring portion 166 cut and raised downward in the feed direction of the workpiece material is provided near the front side of the rotating wheel 130 (upstream side with respect to the feed direction of the workpiece material), the spring portion 166
By the guidance of
Moreover, in normal cases, the elastic deformation of the spring portion 166 does not prevent the rotary ring 130 from engaging the workpiece material. The elastic force of the spring portion 166 is set to a value that allows the above-mentioned engagement by the engagement pressure (pressing force) of the rotary wheel 130 against the workpiece material.

Returning to FIGS. 1 and 2, the lower arm 42
In order to guide the lower workpiece material located below the separating plate 38, the distal end thereof is bent approximately horizontally from the intermediate portion thereof and is positioned within the concave portion 116, and the outer circumference is formed at the distal end thereof. It has a rotary wheel 132 with teeth facing slightly upward, a reduction gear 172 at the base end that meshes with a small gear of a servo motor 170 provided at the base end, and a middle portion connected to a universal joint 174. A drive shaft 176 is provided. The tip of the lower arm 42 is the upper arm 4
The rotary ring 13 is symmetrical with the tip of the rotary ring 13 and has substantially the same structure as the tip of
2 is designed to be rotationally driven. Note that the lower arm 42 is connected to the pin 178 similarly to the upper arm 40.
The rotary wheel 132 is rotatably supported by the housing 14 by the separating plate 38, and the rotating ring 132 is adapted to sandwich the workpiece material between the separation plate 38 and engage with the separating plate 38.

Intermediate wall 24 includes pivot arms 180 and 18.
Pulse motor 134 and 1 with 2 on the output shaft
38 is attached, and its rotating arm 18
0 and the upper arm 40 is an elastic link 1.
36 is provided, and the upper arm 40 is connected to the pulse motor 1.
34 in the same rotational direction, and an elastic link 140 is provided between the pivot arm 182 and the lower arm 42 to rotate the lower arm 42.
is driven by a pulse motor 138 in the opposite rotational direction. Limit switches 184 and 186 are attached to the intermediate wall 24 to detect the home position of the pivot arms 180 and 182. That is, the limit switch 184 is installed at a position where it is activated by the rotating arm 180 when the tip of the upper arm 40 is raised the most, and the limit switch 186 is installed at the position where it is activated by the rotation arm 180 when the tip of the lower arm 42 is moved the most downward. It is mounted in a position where it can be actuated by a movable arm 180.

The elastic link 136 constitutes an elastic device, and includes a bottomed cylindrical cylinder 190 that accommodates a compression coil spring 188 and whose base end is pivotally connected to the rotating arm 180, and whose distal end is connected to the upper arm. 4
0 and a compression coil spring 18 at the proximal end.
The rod 194 includes a flange portion 192 for receiving the tip side of the cylinder 190, and a thick-walled cylindrical sliding metal 196 that is fixed to the tip opening of the cylinder 190 and supports the rod 194 so as to be freely movable in the axial direction. ing. Therefore, compression coil spring 1
88 is operatively connected to an upper arm 40 provided with a rotating ring 130, and after the tip of the upper arm 40 engages the workpiece material, the rotating arm 180 further rotates (counterclockwise in FIG. 1). Then, the rod 194 is retracted and the compression coil spring 188 is compressed between the flange portion 192 and the cylinder 190.
The compression coil spring 188
92 and the cylinder 190, and the engagement pressure (pressing force) of the rotating ring 130 is generated according to the amount of compression of the compression coil spring 188.

The elastic link 140 constitutes an elastic device like the elastic link 136, and includes a bottomed cylindrical cylinder 198 whose base end is pivoted to the rotating arm 182, a compression coil spring 200, and a sliding metal 202. and a rod 204,
The distal end of the rod 204 is pivotally attached to the lower arm 42, and the proximal end of the rod 204 is provided with a flange portion 206 for receiving the proximal end of the compression coil spring 200. Therefore, as the rotating arm 182 rotates (counterclockwise in FIG. 1), after the tip of the lower arm 42 engages with the workpiece material,
The rod 204 is pulled out from the cylinder 198 and the compression coil spring 200 is moved to the flange portion 206.
and the sliding metal 202, and the engagement pressure of the rotary ring 132 is generated according to the amount of compression of the compression coil spring 200.

Note that 208 is a photoelectric device that is fixed to the upper plate 36 and detects the terminal edge of the upper workpiece material, and a detection device (not shown) for detecting the terminal edge of the lower workpiece material is provided in the recessed portion 116. ing.

Further, 210 is a screw for attaching the support block 78 to the upper slide plate 46. As shown in FIG. 2, when the screw 210 is loosened and the support block 78 is pulled out to the left in the figure, the support block 78 and the gap adjustment device 76,
The upper plate 36, the separation plate 38, the photoelectric devices 72, 208, etc. are configured to be easily removable. For example, attachments (not shown) for sewing operations, such as pin tucks, can be easily attached to the support block 78 to easily accommodate these operations. Note that electrical signals such as current supply to the photoelectric devices 72 and 208 and signals from them are transmitted via a connector (not shown) provided in the housing 14 at a suitable location near the screw 210.

The operation of this embodiment will be explained below.

First, the operator appropriately adjusts the gap between the lower gap adjustment knob 84 and the upper gap adjustment knob 94 with the spacer plate 16 and the gap between the separation plate 38 and the upper plate 36 according to the thickness of the material to be processed. After adjusting the seam allowance from the side edges of the two workpiece materials by rotating the upper and lower slide knobs 56 and 58, the two workpiece materials are positioned below or above the rotating wheels 130 and 132. The upper plate 36 and the separation plate 38 are inserted into the respective gaps from the left ends in FIG. 1 until they can be engaged with them.

Next, in accordance with a starting operation of a control device (not shown), the pulse motors 134 and 138 are activated to the first position, respectively.
When rotated counterclockwise in the figure, the rotating arm 18
0 and 182 are rotated from their fixed positions, the tips of the upper arm 40 and lower arm 42 move toward the workpiece material, and the rotating wheels 130 and 132 move toward the upper workpiece material and the lower workpiece material. Each is pressed. That is, the pulse motors 134 and 138 are each supplied with a drive signal for rotating the output shaft by a predetermined angle depending on the properties of the material to be processed, such as thickness, hardness, material, etc. 180 and 182 are rotated to positions based on their drive signals,
The tips of the upper arm 40 and the lower arm 42 contact the workpiece material and are prevented from rotating.

As a result, the compression coil spring 188 in the elastic link 136 connecting the upper arm 40 and the rotation arm 180 is compressed in accordance with the amount of rotation of the rotation arm 180, and the compression coil spring 188 corresponding to the amount of compression is compressed. The elastic force of rod 194
is transmitted to the upper arm 40 via the elastic force, and the rotating ring 130 is engaged with the upper workpiece material by a pressing force corresponding to the elastic force. Similarly, the lower arm 42
The elastic link 14 connects the rotating arm 182 and the rotating arm 182.
The compression coil spring 200 in 0 is compressed according to the amount of rotation of the rotating arm 182, and the rotating ring 132 is engaged with the workpiece material below with a pressing force corresponding to the amount of compression.

In this way, pulse motors 134 and 138
The pulse motors 134 and 138 are
The rotation angles of the rotation arms 180, 182 are precisely positioned in steps, and the amount of elastic deformation of the compression coil springs 188, 200 is changed. This allows the engagement pressure (feed dog 3
The rotary wheels 130, 132 are brought into engagement with the workpiece material fed by the rotary wheels 130, 132 with a suitable pressing force that is as small as possible without causing wrinkles or distortion to the workpiece material fed by the rotary wheels 130, 132. Therefore, the pulse motor 13
4,138 is a compression coil spring 188,20
The rotating wheel 13 is rotated by changing the amount of elastic deformation of 0 in stages.
This constitutes an adjusting means for adjusting the engagement pressure of 0.132.

For this reason, compared to, for example, manually adjusting the air pressure supplied to a pneumatic cylinder to press a rotary ring against a workpiece material, there is no need for skill to delicately operate a control valve. Moreover, the rotating wheels 130, 1 can be easily operated even during sewing work without making the device large and expensive.
The engagement pressure with respect to the workpiece material 32 can be maintained at a desired value at all times, making it difficult for misaligned stitches and uneven stitch pitches to occur, thereby improving the quality of the stitched product. Moreover, since the rotary wheels 130 and 132 are always engaged with the same pressing force with respect to workpiece materials having the same properties, it is possible to obtain the effect that sufficient reproducibility of the pressing force can be obtained.

Moreover, since pneumatic equipment such as pneumatic pumps, pneumatic piping, filters, lubricators, switching valves, pressure regulating valves, and pneumatic cylinders can be removed, the guide device can be configured compactly and easily, and there are no problems related to air exhaust. The generation of oil mist and noise is completely eliminated.

The rotating wheels 130 and 132 are respectively brought into engagement with the workpiece material, the sewing machine is started, and sewing is started, and at the same time the workpiece material is fed by the feed dog 35. In such a state, the deviation of the side edge of the workpiece material from the reference position causes the photoelectric device 72,
74 respectively, and the photoelectric device 7
The servo motors 142 and 170 are driven based on the detection signals output from the servo motors 2 and 74, and the deviation of the side edges of the workpiece material is corrected. That is, for example, if the side edge of the upper workpiece material deviates toward the sewing needle 34, the servo motor 142 is driven based on a detection signal representing the deviation, and the rotating wheel 130
is rotated (counterclockwise in Figure 1). For this reason, the upper workpiece is moved in a direction substantially perpendicular to its feed direction (rightward in FIG. 1) until the deviation of its side edge from the reference position becomes zero. Conversely, even if the side edge of the upper workpiece material deviates toward the housing 14, the deviation is corrected to zero by the operation opposite to the above. This operation is also performed on the lower workpiece material.

As a result, two pieces of workpiece material can be automatically sewn together with a seam along and at a fixed distance from the side edges.

Although the embodiment of the present invention has been described above based on the drawings, the present invention can also be applied to other aspects.

In order to generate engagement pressure between the rotating wheels 130, 132 and the workpiece material, the tips of the upper arm 40 and lower arm 42 are pressed toward the fixed separation plate 38, but on the contrary, The distal ends of the upper arm 40 and lower arm 42 may be fixed in position, and the separation plate 38 may be pressed against them.

Further, the upper arm 40 and the lower arm 42 are rotationally driven, and their rotating wheels 130, 132 are
Elastic links 136, 140 that apply engagement pressure to
The connecting positions of the pulse motors 134 and 138 can be changed in various ways depending on the rotation direction of the pulse motors 134 and 138, and
The compression coil springs 188, 200 may be made of leaf springs, rubber, or the like.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a partially cutaway front view and a plan view showing an embodiment of the present invention. FIG. 3 is a cross-sectional view taken from the side in FIG. 2. Figure 4 is the same version of Figure 2 with the upper and lower arms removed.
FIG. FIG. 5 is a cross-sectional view taken from - in FIG. 2, and FIG. 6 is a cross-sectional view taken from - in FIG. 2. FIG. 7 is a partially cutaway view of FIG. 1. FIG. 8 is a cross-sectional view taken from the side in FIG. 1. 36... Upper plate, 38... Separation plate, 44... Notch (notch part), 72, 74... Photoelectric device (detection device), 76...
Gap adjustment device (gap changing means), 130, 132
...Rotating wheel, 134, 138...Pulse motor, 13
6,140...Elastic link (elastic device), 188,
200... Compression coil spring (spring).

Claims (1)

[Claims for Utility Model Registration] (1) Disposed so as to be movable individually along the direction intersecting the feed direction on the side in front of the seam forming point in the feed direction of the workpiece material, and a pair of detection devices for detecting deviations from respective reference positions of side edges of two upper and lower workpiece materials being fed in the direction of the feed direction; a separating plate for separating the material at the side; and a separating plate for separating the material at the upper and lower sides in a direction intersecting the feeding direction of the material to be processed based on a detection signal from the detection device.
In order to move each of the workpiece materials, the workpieces are arranged so as to be rotatable around an axis substantially parallel to the feeding direction and facing each other with the separating plate in between so as to be able to engage with the workpiece materials respectively. A pair of rotary wheels configured to automatically sew together two upper and lower workpiece materials by forming a continuous seam at a predetermined position from each side edge of the upper and lower workpiece materials. An automatic guide device for a workpiece material in a sewing machine according to the present invention includes a rod that is provided so as to be movable back and forth along its own axis, and a spring that applies elastic force to the rod, and the rotating wheel is connected to the rotating wheel at one end in the axial direction. a pair of elastic devices operatively connected to each of the elastic devices; and a pair of elastic devices operably connected to the other axial ends of the pair of elastic devices, each pushing or pulling the other end in response to a supplied drive signal. a pair of step-driveable pulse motors that elastically deform the spring and change the engagement pressure of the rotary wheel with respect to the separating plate in stages; Automatic guidance device. (2) the automatic guide device is placed on the sewing machine bed surface and located above the separation plate;
The sewing machine further includes an upper plate having a notch through which the rotary wheel can protrude, and the lower workpiece material of the upper and lower workpieces is accommodated between the sewing machine bed surface and the separation plate, and the upper plate The workpiece material to be located is accommodated between the separating plate and the upper plate, and the distances between the sewing machine bed surface and the separating plate and between the separating plate and the upper plate are maintained respectively. An automatic guide device for a workpiece material in a sewing machine according to claim 1, characterized in that the device is equipped with a pair of interval changing means that can be changed arbitrarily.