JPS6043989B2 - industrial sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an industrial sewing machine used to sew trim covers, etc. that are placed over the cushioning material of automobile seats, for example, and in particular to a structure for automatically and continuously sewing straight and curved stitches. Regarding.

Generally, when sewing trim covers, etc. that cover the cushioning material of car seats, the main part, side parts, and other structural parts are cut into a predetermined shape and sewn together manually using an industrial sewing machine.・However, this seam combines a straight seam part and a curved seam part,
The operator rotates the sewing member along the curve of the seam allowance while ensuring that the seam allowances are overlapped at the end position of the straight stitch.

For this reason, manual sewing work using a sewing machine requires a high level of skill and careful attention, and is a physical labor that is harsh on the hands, feet, eyes, and the like. An object of the present invention is to take the above-mentioned conventional situation into consideration, and to provide a rotating presser plate placed on the side of the presser foot that detects when the edge of the sewing machine in a straight sewing state comes off the detector placed on the front side in the feed direction. The sewing member is moved toward the sewing member by a signal from the rotary presser plate, thereby pressing down a local part of the sewing member, and the sewing member is rotated by the cooperation of the rotary presser of the rotary presser plate and the feed drive of the feed dog. To provide an industrial sewing machine which can be rotated about the center of rotation of a presser plate and can automatically and continuously sew straight and curved stitches.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description of the industrial sewing machine according to the present invention will be given below with reference to the drawings.

Although this embodiment exemplifies the case where a welt for edging is sewn to the main part and side part of a trim cover, the present invention is not limited to this, and can be applied to all types of industrial sewing machines. FIG. 1 is a partially cutaway perspective view of the industrial sewing machine of the present invention, in which a head 2 is installed on a table 1, and the head 2 has a needle bar 3 and a presser foot 4. is attached to the table 1 in a protruding state.

The needle bar 3 is moved up and down by the drive of a motor (not shown), and the presser foot 4 is moved up and down by the operation of a lever (not shown). The table 1 located below the needle bar 3 and the presser foot 4 is equipped with a feed dog 5, and the feed dog 5 is driven by the motor (not shown) and is closed in a vertical helical shape. It swings back and forth while drawing a movement trajectory. A needle 6 is detachably attached to the needle bar 3, and an upper thread is threaded through the needle hole of the needle 6 from a spool rotatably fitted onto a spool shaft (not shown). A hook (not shown) is attached to the lower part of the feed dog 5, and the feed dog 5 is detachably attached to the hook. A bobbin thread (not shown) is supplied from the fitted bobbin. Therefore, by positioning the sewing members Xl and X2 in an overlapping state between the presser foot 4 and the feed dog 5, and driving the motor after lowering the presser foot 4, the sewing members Xl, When sewing X2, the elastic presser foot 4 works together with the feed drive of the feed dog 5 to produce the arrow A.
The needle thread from the needle 6 and the bobbin thread from the button are sewn together in a known manner while being moved intermittently in this direction. On the other hand, according to the present invention, the optical fiber sensor 7 constituting the detector
is disposed in front of the sewing members Xl and X2 in the feeding direction (same as the direction of arrow A) when sewing the sewing members Xl and X2, that is, in the vicinity of the presser foot 4 and the feeding dog 5.

The optical fiber sensor 7 is of a transmission type in which a light emitting part and a light receiving part are arranged facing each other with a predetermined distance between them. The optical fiber sensor 7 is composed of one optical fiber element 8 that constitutes a light emitting section or a light receiving section, and the other optical fiber element 9 that constitutes a light receiving section or a light emitting section paired with this optical fiber element 8. The working end surface of one optical fiber element 8 is in the feeding driving direction of the feeding dog 5 (
Same as the direction of arrow A) Through hole 10 drilled in one corner of the front
The optical fiber element 9 is positioned in a loosely fitted state while being exposed upward from the bottom of the table 1, and the working end surface of the other optical fiber element 9 is placed directly above the working end surface of the one optical fiber element 8 at a predetermined distance. They are placed opposite each other. The working end of this optical fiber element 9 is fixed via a fixture 12 to a guide 11 provided on the table 1 while being located on the side of the feed dog 5 . Further, the optical fiber element 8
. Therefore, the optical fiber sensor 7 has an optical fiber element 8
, 9 is sensed when the edge of the sewing member X1 is positioned between the working end surfaces of the sewing member On the other hand, a rotating presser plate 13 is disposed on one side of the upper part of the presser foot 4 so as to be rotatable along the table 1. The rotating presser plate 13 has a boss 14 projecting from the center of the top in the shape of a cylinder with a bottom.

An air cylinder 15 constituting a driving source is attached to the bracket 1 on the outer surface of the head 2 located on the rotation presser plate 13 side.
5a and 15b, the piston rod 1 of this air cylinder 15 is fixed so that the device position in the vertical direction can be adjusted.
6 is moved up and down from the head 2 toward the table 1.

The tip of the piston rod 16 is provided with the rotary holding plate 1.
3 is rotatably attached. That is, the tip of the piston rod 16 is passed through a through hole 17 bored in the center of the top constituting the bottom of the boss 14, as shown in the second figure, and the tip of the piston rod 16 is positioned within the boss 14. There is. Nuts 18A and 18B are seated on the piston rods 16 located above and below the through hole 11, respectively,
Thrust bearings 19A, 19B are interposed between these nuts 18A, 18B and the top of the boss 14, respectively. Although not shown, air piping is provided between the air cylinder 15 and the air compressor via an electromagnetic solenoid valve.
By switching this electromagnetic solenoid valve, the piston rod 16 is moved up and down a predetermined distance.

The vertical movement of the piston rod 16 is regulated by a signal from the optical fiber sensor 7. That is, when the edge of the sewing member X1 is located between the optical fiber elements 8 and 9, the piston rod 16 is stopped at the upper position, and the edge of the sewing member X1 is not located between the optical fiber elements 8 and 9. At this time, the piston rod 16 is stopped in the lower position. By stopping the piston rod 16 in the upper position, the rotary presser plate 13 is held at the position shown by the solid line in FIG. is held in the indicated position. When the rotary presser plate 13 is held at the position shown by the imaginary line, the local part of the sewing member -X is
3 and table 1. Further, a beaded guide 20 constituting the sewing member X2 is fixed in front of the optical fiber element 9 on the guide plate 11, and the beaded edge is passed through the guide 20 from this side toward the feed dog 5.

According to the embodiment configured as described above, the sewing member X1 is positioned between the presser foot 4 and the feed dog 5 by the cooperation of the presser foot 4 and the feed dog 5 while being guided by the guide plate 11. The sewing members Xl and X2 are sewn in a straight line using the upper thread from the needle 6 and the lower thread from the button.

During this straight sewing, since the sewing member X1 is located between the optical fiber elements 8 and 9, the rotating presser plate 1
3 is held in the position shown by the solid line in FIG. and,
When the curved part of the sewing member X1 passes between the optical fiber elements 8 and 9 as shown by the solid line in FIG. 3 as the straight stitch progresses, light is transmitted from one of the optical fiber elements 8 and 9 to the other. Then, a sensing signal from the optical fiber sensor 7 is sent to an electromagnetic solenoid valve (not shown), and the piston rod 16 is moved downward. As a result, a local part of the sewing member X1 is pressed between the rotating presser plate 13 and the table 1. At this time, although a straight force is applied to the sewing members Xl and X2 by the feed drive of the sewing machine, that is, the feed drive of the feed dog 5, since the local part of the sewing member X1 is pressed down, the sewing The member X1 is rotated in the direction of arrow B in FIG. 3 about the center of rotation of the rotary presser plate 13 by the cooperation of the rotary presser of the rotary presser plate 13 and the feed drive of the feed dog 5, and the sewing member X1, X2 is sewn in a curved line. When the sewing member X1 is rotated in the direction of arrow B and its posture is controlled as shown by the imaginary line in FIG.
The piston rod 16 is moved upward by the sensing signal of the optical fiber sensor 7, and the pressing of the rotary presser plate 13 is released, so that the sewing members Xl,
X2 is sewn in a straight line again. By the way, according to the embodiment, since the rotary presser plate 13 is rotatably arranged,
When sewing the curved line, the rotating presser plate 13 is used as the sewing member X1.
As it turns in the direction of arrow B, it is rotated in the same direction, that is, in the direction of arrow C. As a result, the sewing member Xl that is rotated
, X2, etc., and smooth curved stitching continuous to straight stitching is automatically performed.
Moreover, according to the embodiment, the detector is composed of the optical fiber sensor 7, and the optical fiber elements 8 and 9 of the optical fiber sensor 7 can be easily obtained with relatively small diameters.
By attaching it close to the sewing member X1, it is possible to perform a good curved stitch that matches the curved edge of the sewing member X1. In addition, since the driving source is composed of the air cylinder 15, the rotary presser plate 13 can be moved up and down quickly and accurately.
Compared to a hydraulic cylinder, it creates a cleaner working environment without oil leakage, and prevents the sewing members Xl and X2 from becoming soiled. Now, FIG. 4 is a cross-sectional view showing another embodiment of the present invention, and the feature of this embodiment is that the part of the table 1 facing the rotary presser plate 13 shown by the imaginary line in FIG. This is because the plate 21 is provided.

The rotary plate 21 is in the shape of a disk having approximately the same diameter as the rotary presser plate 13, and is rotatably fitted into a recess 22 bored in the table 1 with a thrust bearing 23 interposed therebetween. The recess 22 has a circular shape with a slightly larger diameter than the rotating plate 21. Top surface 2 of the rotating plate 21
1a is slightly cut out from the top surface 1a of the table 1. Therefore, according to this embodiment, the sewing member
1 is pressed between the rotary press plate 13 and the rotary plate 21, so even if the pressing force of the rotary press plate 13 against the sewing member X1 becomes somewhat strong, the sewing member X1
turns smoothly. In other words, when changing from a thick seam member to a thin seam member during sewing work, the lower stop position of the piston rod 16 is set in advance with reference to the thin seam member. By keeping it in place, thick-walled sewing members can be sewn in that state. In each of the embodiments described above, the case where the optical fiber sensor 7 is configured as a transmissive type is illustrated, but in the present invention, a modification example in which the optical fiber sensor 7 is configured as a reflective type can be considered.

Further, in each of the embodiments described above, the drive source was constituted by the air cylinder 15, but in the present invention, the drive source is constituted by an electromagnetic solenoid, and the rotary holding plate 13 is rotatably attached to the plunger of this electromagnetic solenoid. In some cases, it is also possible to omit air piping. As explained above, according to the present invention, as the curved part of the sewing member passes through the detector as the sewing progresses, the rotating presser is used only when the edge of the sewing member comes off the detector. The plate presses a local part of the sewing member, and the sewing member is rotated around the center of rotation of the rotating pressing plate by the cooperation of the rotating presser of the rotating pressing plate and the feed drive of the feed dog. , straight and curved stitches can be automatically sewn continuously.

Furthermore, since the rotary presser plate is rotatable in the direction along the table, smooth curved stitching can be performed while preventing undesirable wrinkles from occurring in the seam allowance when the sewing member is rotated.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of an industrial sewing machine according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ of Fig. 1, and Fig. 3 is a diagram for explaining the present invention in detail. The perspective view and FIG. 4 are sectional views corresponding to FIG. 2 for explaining another embodiment of the present invention. 1... table, 2... head, 4... presser foot, 5...
... Feed dog, 7... Optical fiber sensor, 8,9.
...Optical fiber element, 13...Rotary holding plate, 14.
... Boss, 15 ... Air cylinder, 16 ... Zeston rod, 21 ... Rotating plate.

Claims (1)

[Scope of Claims] 1. In an industrial sewing machine that sews while feeding a sewing member located between a presser foot attached to the head of a table and a feed dog attached to the table in a fixed direction, a detector disposed in front of the sewing member in the feed direction so that the edge of the sewing member crosses over; a vertically movable rod located on one side of the presser foot; and a rod facing the top surface of the table;
A rotary presser plate rotatably pivoted to the lower part of the rod, and a signal from the detector that detects that the edge of the sewing member has come off lowers the rod to attach the rotary presser plate to the sewing member. and a drive source that rotates the sewing member around the center of rotation of the rotary presser plate by the cooperation of the rotary presser foot and the feed drive of the feed dog. sewing machine. 2. The industrial sewing machine according to claim 1, further comprising a rotary plate that rotates in cooperation with the rotary press plate at a portion of the table that faces the rotary press plate. 3. The industrial sewing machine according to claim 1, wherein the detector is constituted by an optical fiber sensor. 4. The industrial sewing machine according to claim 1, wherein the drive source is an air cylinder. 5. The industrial sewing machine according to claim 1, wherein the drive source is an electromagnetic solenoid.