JPS6043990B2 - sewing machine sewing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing device for a sewing machine, and particularly to a sewing device that electrically detects the right end and moves the cloth from side to side in a direction intersecting the cloth feeding direction using a cloth moving mechanism that acts on the right end based on the detection signal. This invention relates to a sewing device that automatically maintains a constant distance from the right end to the needle and performs automatic suturing.

In this type of conventional device, in order to accurately feed the cloth to the right edge detection device and the cloth moving device, which are fixedly placed, a cloth guiding device is placed at a fixed horizontal interval in front of these devices in the cloth feeding direction. It was configured.

For this reason, when this type of device is used to sew a sewing product that has a thick part in the middle of the cloth, for example, the side seam of pants, that part is thickened because a pocket is sewn in the middle of one side of the cloth. There is a drawback that this type of sewing is virtually impossible because the fabric gets caught in the fabric guide device or right edge detection device and cannot be fed, and if the gap between the fabric guide devices is widened so that the thick part of the fabric can pass through, the right edge can be accurately detected. There was a drawback that the fabric could not be guided to the fabric detection device, making it impossible to perform accurate sewing.

When sewing this type of cloth, the present invention moves these devices to a non-working position away from the right edge from the start of sewing until the thick portion of the fabric passes through these fabric guides and the right edge detection device, It is an object of the present invention to eliminate the above-mentioned drawbacks of the prior art by providing a device which automatically assumes the working position after the thick portion of the fabric has passed through these devices.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic plan view of the seam part, and FIG. 2 is a side view thereof. It consists of a pair of upper cloth control devices 1 and lower cloth control devices 2 arranged vertically and shifted from side to side.

FIG. 3 is a perspective view with the upper part of the frame 3 of the upper cloth control device 1 cut away and a part of the cover 4 removed, and 5 is a fixed body whose base is not shown but is fixed to the upper surface of the bed 6. At the same time, a cylindrical portion 7 is integrally formed above. Reference numeral 7 denotes a U-shaped connecting body, which is fixed to the right inner side of the frame 3 with screws 8, 8, and is connected to the frame 3 with respect to the fixed body 5 by a shaft 9 that loosely fits through the cylindrical portion 7 of the fixed body 5. It is rotatably supported.

Reference numeral 10 denotes a spring wound around the shaft 9, one end of which is engaged with the upper surface of the fixed body 5, the other end of which is engaged with the upper right surface of the connecting body 7, and the frame 3 is
A clockwise rotational force is always applied to the shaft 9 around the shaft 9.

Reference numeral 11 denotes a sliding plate, which is supported on the inner lower side of the frame 3 so as to be slidable left and right in a direction perpendicular to the cloth feeding direction, and its left end projects outward from the left end of the frame 3.

12 is a rack gear, and the gear 1 is fixed to the upper surface of the sliding plate 11 inside the frame 3 and rotatably supported inside the frame 3.
3 are interlocked.

Numeral 14 denotes a gear meshing with the wheel 13, which is rotatably supported on the frame 3 and fixed at one end to a shaft 15 protruding outward from the frame 3.

Reference numeral 16 denotes a rack support, which is fixed to the outer surface of the frame 3 with screws 17, 17, and has a rack gear 18 on the upper surface.
A groove 19 that slidably supports the.

The rack gear 18 meshes with a gear 20 fixed to the protruding end of the shaft 15 described above. Reference numeral 21 denotes a cylinder support plate whose base is fixed to the end face of the rack support 16 and whose tip supports the base of the air cylinder 22.

23 is an interlocking plate, and base! is fixed to the rear end surface of the rack gear 18 (not shown), and the tip is connected to the rod 24 of the air cylinder 22.

As a result, when the air cylinder 22 acts and the rod 24 protrudes to the right, the rack gear 18 slides to the right, rotates the gear 20 and the shafts 15, 14, and 13, and the rack gear 18 slides to the right.
When the air cylinder 22 becomes inactive, the sliding plate 11 moves to the left. Reference numeral 25 denotes a well-known electrical cloth edge detection device, which is fixed to the left end of the sliding plate 11 and has an upper cloth detection passage 27 and a lower cloth detection passage 28 that sandwich a horizontally extending reflective plate 20.
It is equipped with

Reference numeral 29 denotes a cloth guide device, which is comprised of a separation plate 30 whose base is fixed to the sliding plate 11 and an upper cloth guide plate 32 arranged above the separation plate 30 at a distance to form an upper cloth guide passage 31, as shown in FIG. As shown in FIG. 2, the separation plate 30 extends to the upper surface of the bed to form a lower cloth guide passage 33.

Reference numeral 34 denotes a well-known cloth moving device, which supports a holder 35 inside the frame 3 so as to be rotatable about a shaft 36, and has an arm 37 extending above the separation plate 30.

In addition, 38 indicated by the two-dot chain line is fixed to the back side of the holder 35.
It is a servo motor, which rotates in forward and reverse directions in response to a cloth presence/absence signal from a cloth edge detection device, rotates forward and reverse a roller 40 provided at the tip of an arm 37 via a rotating shaft 39, and cooperates with the separation plate 30 to separate the cloth. Moving. 49 is an air cylinder provided within the frame 3, the base of which is supported within the frame 3, and the tip of the rod is supported within the holder 3.
5, and its action rotates the holder 35 counterclockwise about the shaft 36, presses the roller 40 onto the separation plate 30, presses the cloth between them, and causes the roller 40 to press upwardly due to non-action. to leave.

Note that the lower fabric control device 2 includes the same parts related to the holder 35 of the upper fabric control device 1, and as shown in FIG. 2, its rollers are disposed below the separating plate 30 to move the lower fabric. .

In the figure, 41 is a cloth presser foot, and 42 is a cloth edge guide fixed to the needle plate 43.

Reference numeral 44 in FIG. 2 is an air cylinder, whose base is supported by a sewing machine frame (not shown), and whose lower end is opposed to the upper left end of the shaft 9 of the frame 3.
is rotated about the shaft 9 against the spring 10 to move the moving device 3, cloth guide device 29, and cloth edge detection device 25 downward to the lower working position, and due to non-action, the frame 3 is released from the spring. The actuating force of 10 causes each device to rotate clockwise around the shaft 9 to bring the above-mentioned devices to an upper non-active position away from the upper surface of the bed 6.

FIG. 5 is a block diagram of an electric circuit that controls this device, 45 is a start switch, 46 is a well-known main control device, which starts and stops the sewing machine, controls the roller 40 of the moving device 12, and controls the separation plate 30 (cloth ) Air cylinder 4 that approaches and separates from
1, the servo motor 38 is rotated in forward and reverse directions, and the roller 40 is rotated. 47 is a sub-control circuit, which includes a selection switch 48 for enabling or disabling the sub-control circuit, controls the air cylinders 22 and 44, and controls the counter 5.
When the set count number set by 0 is reached, a sewing machine stop signal is sent to the main control circuit.

The present invention has the above-mentioned configuration, and the operation will be explained below with reference to the time chart of FIG. 4. For pants etc. that have a thick part of the fabric, the number of stitches from the sewing start point until the thick part of the fabric passes the fabric edge detection device 25 is set in advance, the number is set in the counter 50, and the sub control circuit is enabled. Turn on the selection switch 48. In this sewing start state, the air cylinders 22, 44, and 49 are inactive, so the sliding body 11 moves to the right and the cloth edge detection device 25
and the cloth guide device 29 are located at inactive positions away from the right side of the movement path of the cloth in the cloth feeding direction, and the left side of the upper cloth detection device 1 is raised from the cloth movement path due to the action of the spring 10. ,
Furthermore, the rollers 40 of the upper and lower cloth detection devices are separated from the separating plate 30, respectively.

From this state, two pieces of cloth are inserted into the lower surface of the presser foot 41, and the ends of the cloth are brought into contact with the cloth edge guide 42.

When the start switch 45 is turned on, the sewing machine is driven and the two pieces of cloth are sewn together at a certain distance from the cloth edge guide 42 to the needle. Manually guide you.

When the sewing machine starts sewing and finishes forming the stitches set by the counter 50, that is, when the thick part of the cloth passes through the cloth edge detection device 25, a signal from the counter 50 causes the sub-control circuit 47 to send the stitches to the main control circuit 46. When a signal is issued, the sewing machine stops, and the cylinder 44 acts to lower the cloth control device 1 to the upper surface of the bed, and the cylinder 22 acts gently to cause the sliding plate 11 to start moving to the left.

From the middle of this movement, the upper and lower cloths enter the upper and lower cloth detection devices 26 and 28 of the cloth edge detection device 25, and the cloth edge detection device becomes effective, and the upper and lower cloth guide passages 3L of the cloth guide device 29
The upper and lower cloths enter the upper and lower cloths 33, and the cylinder 49 acts to bring the rollers 40 of the upper and lower cloth moving devices into contact with the upper and lower cloths. When the start switch 45 is turned on again from the above state, the sewing machine starts and sews the upper and lower fabrics, detects the upper and lower fabric edges based on the signal from the fabric edge detection device 25, rotates the servo motor 38 in forward and reverse directions, and rotates the roller 40. Two pieces of cloth are automatically sewn together by automatic control so that the distance from the upper and lower ends of the cloth to the needle is always constant.

Furthermore, when the end of the fabric is detected, the sewing machine stops and
With the cylinder 44 inactive, the left end of the fabric control device rises to the non-active position above the bed, the cylinder 22 also gradually becomes inactive, the sliding plate 11 moves to the right, and the fabric edge detection device 25 and the cloth guide device 29 are moved to an inactive position laterally away from the cloth edge.

In the illustrated embodiment, the number of days of sewing is set by the counter 50, which is the length from the start of sewing the cloth until the thick portion of the cloth passes through the cloth guide device 29 and the cloth edge detection device 25, and the sewing machine is stopped. Although the device is shown in which these devices are placed in the working position, instead of this counter, a timer or the like may be used to place these devices in the working position after a certain period of time has elapsed from the start of sewing.

In addition, the cloth guide device 29 and the cloth edge detection device 25 are connected to the sliding plate 11.
The sliding plate 11 is moved by an air cylinder 22 to an active position and a non-active position in a direction crossing the cloth moving direction with respect to the cloth moving path, and an air cylinder 44 moves these devices along the cloth moving path. The devices shown above are configured to move between the working position and the non-working position in the vertical direction, but the direction in which these devices are moved between the working position and the non-working position is as follows.
Either the direction crossing the cloth feeding direction or the vertical direction may be used.

Further, the servo motor 3.8 of the cloth moving device 34 may be configured such that it rotates in one direction in response to a cloth no signal from the cloth edge detection device and stops in response to a cloth present signal.

As described above, the present invention automatically detects the edge of the fabric when sewing the inner part of the fabric at a predetermined distance from the edge of the fabric, which has a thick part at a predetermined distance from the sewing start position of the fabric. A fabric edge detection device generates a signal to control the fabric moving device to keep the fabric edge in a fixed position, and a fabric guide device guides the fabric edge to the fabric edge detection device. Until passing through these devices, these devices are placed in a non-working position in a direction crossing or above the cloth feeding direction away from the movement path of the cloth edge, and then automatically returned to the working position within the movement path of the cloth edge. Since the distance from the edge of the fabric to the needle is automatically controlled to be constant during stitching, these fabrics can be stitched together smoothly and accurately, improving sewing efficiency and stabilizing the quality of sewn products. This has the effect of producing sewn products with high commercial value.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view of the sutured part, Figure 2 is a side view of the sutured part,
FIG. 3 is a perspective view with a portion of the upper part of the frame of the upper cloth control device cut away and a portion of the cover removed, FIG. 4 is a block diagram of the control circuit, and FIG. 5 is a time chart. In the figure, 25 is a cloth edge detection device, 34 is a cloth moving device, 29 is a cloth guide, 46 and 47 are main and sub control circuits as control circuits, and 22 and 44 are air cylinders as examples of the moving device. .

Claims (1)

[Claims] 1. An operating position that is close to the fabric edge and generates a fabric detection signal by detecting the presence or absence of fabric on one side of the fabric feed direction line that passes through the needle in front of the fabric feed direction with respect to the sewing machine sewing part, and a function position that is located away from the fabric edge and generates a fabric detection signal. The working position includes a cloth edge detection device that is movable in the horizontal direction crossing the cloth feeding direction or the vertical direction, and the cloth edge detection device at the working position is configured to keep the distance from the cloth edge to the needle constant. A cloth moving device that contacts the cloth in response to a detection signal and moves the cloth in a direction that intersects the cloth feeding direction, and a cloth moving device that is placed in front of the cloth edge detection device in the cloth feeding direction and spaced at a constant horizontal interval from the cloth edge detection device. A cloth guiding device that maintains the fed cloth edge horizontally and is movable in the horizontal direction or vertical direction intersecting the cloth feeding direction between an active position for guiding the cloth edge and a non-working position away from the cloth edge. , a control circuit that generates an action signal after a predetermined number of stitches or a predetermined time has elapsed after starting the sewing machine, and a cloth end detection signal; A sewing device for a sewing machine, comprising a moving device that is activated by an activation signal to move the devices to an activation position, and is inactivated by a cloth end detection signal to move the devices to an inactivation position.