JPS5824152B2 - suturing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for forming seams along each edge of a cut piece, such as a cut piece of clothing, which is cut so that its lines meet at an angle. The present invention relates to a suturing device, and in particular, to a suturing device that enables seam formation along each line by turning the cut piece using a turning means so that when one edge is sutured, the next edge coincides with the feed direction line. It is something.

Conventionally, this type of suturing device was disclosed in U.S. Patent No. 34.
According to this device, which is known from Japanese Patent No. 25369, a rotating means disposed on a sewing machine arm descends from a raised position to engage the upper surface of a cut piece at the same time as sewing of one edge of the cut piece is completed. At the same time, it is designed to rotate along with the cut piece around the vertical axis passing through the sewing point so that another edge that follows coincides with the feeding direction line, so when the rotating means is lowered, the operator may accidentally If your hand is placed on the fabric support surface, there is a risk of your hand being pinched between the rotating means and the fabric supporting table, and the rotating means may rotate toward the worker after being lowered. Therefore, there is a risk that the rotating means will hit the worker's face, which may cause the worker to suffer an unexpectedly large injury, and since the rotating means is always located on the fabric support surface, This has the disadvantage that it obstructs the worker's work such as setting the cloth, significantly reducing safety and workability.

The object of the present invention is to obtain the above-mentioned suturing device that does not have these drawbacks.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.

The sewing machine 1 shown in Figs. 1 and 2 is an overlock sewing machine exclusively for overlock stitching, and the arm portion 1a has a drive shaft (
(not shown) moves up and down in conjunction with the needle bar 3 supporting the needle 2 at the lower end, and the rear end is rotatably supported by a horizontal support shaft 4 perpendicular to the feed direction line so that it can move up and down, and is always elastic. Although not shown, a presser foot 5, which is pushed downward by an acting force, is installed in a batted portion 6 whose upper surface is a cloth support surface 6a that supports the piece W to be sewn, and which cooperates with the needle 2. A looper mechanism that forms an overlock stitch and a looper mechanism that protrudes and retracts from the feed hole of the throat plate 7 disposed on the fabric support surface 6a cooperates with the presser foot 5 to move the piece W to be sewn in a predetermined direction (third and fourth A feeding mechanism for feeding in the direction of the arrow a in the figure) is installed, and furthermore, behind the presser foot 5, it is rotatably supported with respect to the sewing machine arm about an axis that corresponds to the feeding direction line. A thread cutting knife 9 is fixedly arranged on the support shaft 8 so as to cross the feed direction line.

Around the side surface of the sewing machine 1, its upper surface forms a horizontal cloth support surface together with the cloth support surface 6a on the upper surface of the sewing machine bed section 6, and the left half surrounding the sewing machine bed section 6 is formed as an air chamber. An auxiliary stand 10 having a large number of through holes 10a formed on the side circumferential surface of the half part is arranged, and an endless belt 11 having a large number of through holes 11a (FIG. 2) formed on the entire side circumferential surface of this auxiliary stand 10. The hook is slidable along the circumference.

As shown in FIG. 2, a through hole 12 is provided at the bottom of the air chamber of the auxiliary table 10 to connect the conduit 14 of the vacuum device 13, and as shown in FIG. In the section, the electric motor M1 is connected to its motor shaft m.
is fixedly arranged so as to protrude upward, and a roller 15 whose outer circumferential surface engages with the inner circumferential surface of the endless belt 11 is fixed to the motor shaft m.

Further, as shown in FIG. 2, one end of the operating lever 17 is fixed to the spindle 4 that supports the presser foot 5 through a notch 16 provided on the rear side of the sewing machine, and the operating lever 17 is fixed to the support shaft 4 that supports the presser foot 5. The other end of the lever 17 and the armature 18a of the electromagnet 18 appropriately arranged below the auxiliary stand 10 are connected by a chain 20 of equal length through a notch 19 provided in the auxiliary stand 10, and further protrudes outward from the rear side of the sewing machine. The above thread cutting knife 9
One end of the connecting link 21 is fixed to the support shaft 8 of the
The armature 22a of the electromagnet 22 appropriately arranged on the top surface of the electromagnet 22 is connected.

As shown in FIG. 1, the fabric support surface 6a of the bed portion 6 is placed at an appropriate position on the sewing machine frame slightly in front of the presser foot 5.
A pilot lamp 23 is disposed to emit light toward the cloth support surface 6a, and two sensors X and Y made of phototransistors or the like are disposed on the cloth support surface 6a that is irradiated with the light.

The present invention has the above-described structure, and its operation will now be explained with reference to the electrical control block circuit diagram shown in FIG.

In the figure, the mode designation is, for example, means for inputting in advance how many edges of a piece W to be sewn consisting of edges on four sides are to be stitched.

First, one edge E1 of the piece to be sewn W is aligned with the feed direction line a, and its tip is raised from the upper surface of the throat plate 7 against the elastic action of the throat plate 7 and the electromagnet 18. leg 5
When the pilot lamp 23 enters between the two, the irradiation from the pilot lamp 23 to the sensors X and Y is cut off.

By cutting off the irradiation to the sensor A stitch is formed on the edge E1 of the piece W to be sewn while being fed in a predetermined direction (direction a) by the feeding mechanism.

Then, as shown in FIG. 4A, when the rear end of the piece to be sewn passes over the sensors X and Y and the pilot lamp 23 illuminates the sensors X and Y, the sewing machine drive motor M2 stops. Then, the sewing machine 1 stops, and the formation of the stitch on the edge E1 is completed, and the electromagnet 18 is actuated to raise the presser foot 5 from above the piece W to be sewn.

At this time, the leading end of the piece W to be sewn hangs downward from the rear edge of the auxiliary table 10 and comes to face the endless belt 11.

Then, the vacuum device 13 is activated, and the suction force causes the leading end portion of the piece W to be sewn to move through the through hole 10a on the side surface of the rear end of the auxiliary stand 10 and through the through hole 11a of the endless belt 11 located at a position opposite thereto. At the same time that the endless belt 11 is attracted to the outer peripheral surface, the electric motor M1 is activated to rotate the roller 15 fixed to the motor shaft m in the direction of the arrow in FIG. is slid on the side peripheral surface in a counterclockwise direction in FIG.

Due to this sliding motion of the endless belt 11, the tip of the piece W to be sewn is moved together with the endless belt 11 while being attracted and held on the outer peripheral surface of the endless belt 11. As a result, as shown in A of FIG. The piece W to be sewn is centered around point P, that is, the needle drop point.
is now rotated in the direction of the arrow on the cloth support surface.

Then, as shown in FIG. 4B, the sutured edge E1
Continuing (When the next edge E2 coincides with the cloth feeding direction line, the irradiation to the sensors
At the same time, the rotation of the sewing material W is stopped, and the adhesion of the tip of the sewing material W is released, and almost at the same time, the electromagnet 18 becomes inactive, and the presser foot 5 is lowered by elastic action, thereby lowering the sewing material W.
As it descends again, the drive motor M2 of the sewing machine is driven again to form a stitch along the edge E2.

By repeating such actions, stitches are sequentially formed along each line of the piece W to be sewn, and in this case, when the number of edges to be sewn inputted by the mode specification is sewn, that is, When the rear ends of the pieces W to be sewn corresponding to the above-mentioned number are detected, the electromagnet 22 is activated, and the thread cutting knife 9 is rotated via the connecting link 21 and the support shaft 8 to the sewing point. The stitching thread extending from P to the rear end of the piece to be sewn W is cut.

Note that the above control circuit controls the last piece W to be sewn according to the mode specification.
When the rear end is detected, the sewing machine drive motor M2
does not become inactive immediately, but becomes inactive after a certain number of stitches have been formed or after a certain period of time after the rear end is detected, and at the same time, the electromagnet 18 is activated and the presser foot 5 furthermore, the vacuum device 13 and the electric motor Ml are not operated again (the control circuit is reset) after the rear end is detected.

As described above, in this invention, when sewing a piece to be sewn having a plurality of edges that are in contact with each other at an angle, for example, using an overedge sewing machine or the like, when one edge is sewn, the rotating means holds the piece to be sewn by an air flow. The sewing machine rotates along the fabric support surface around the stitching point or a point close to it, and continues to the stitched edge (by aligning the next edge with the fabric feeding direction line, unlike the conventional method) , there is no danger of the worker being seriously injured due to the turning means.
It has excellent safety, and the rotating means does not interfere with the worker's work such as centrifuging the sewing material (it has the effect of significantly improving work efficiency, etc.).

In the above embodiment, the auxiliary stand 10 is provided with an air chamber and connected to the vacuum device 13, and the endless belt 11 is provided with a large number of through holes 11a on the side circumferential surface thereof. The end portion of the piece to be sewn W hanging down from the surface of the fabric support table is suctioned and held on the outer peripheral surface of the endless belt 11 by the action of the vacuum device 13, while the endless belt 11 is held. Although the piece W to be sewn is rotated by sliding, as shown in FIG. A rotating means A having a large number of through holes a is disposed so as to be rotatable back and forth about a vertical axis by an electric motor M1, and is connected to a vacuum device 13' by a flexible conduit 14'. The leading end of the piece to be sewn hanging down from the rear edge of 10 is suctioned and held on the outer surface of the rotating means A by the action of the vacuum device 1, and the piece to be sewn is rotated by the rotating means A by the operation of the electric motor M1. The same effect as in the above embodiment can be obtained even if the sewing machine is rotated, and in this case, the rotation means A may be configured to return and rotate when the rotation of the piece to be sewn is completed.

Further, as shown in FIG. 7, the endless belt 11 provided with a large number of through holes 11a is arranged so that a part thereof slightly protrudes outward from cutouts 10a and 10b appropriately provided in the upper surface of the auxiliary table 10. The air chamber connected to the vacuum device (not shown) is placed in the auxiliary table 10 and is placed below the endless belt 11 which is exposed on the supporting surface, and the sewing material is placed on the endless belt 11 after the sewing is completed. The piece W to be sewn may be rotated by sucking and holding the piece W by operating a vacuum device and moving the endless belt 11 by operating an electric motor.

According to this, even if the stitching of one edge is completed, the piece to be sewn W
Even when sewing a piece W to be sewn with such a length that the tip portion thereof does not hang down from the rear end edge of the auxiliary table 10, the rotating action can be reliably performed.

Furthermore, in the above embodiment, the sewing piece W is rotated while being sucked and held by a vacuum device, but as shown in FIG. The air discharge pipes 24 are arranged at intervals, and an air compressor (not shown) is connected to the air discharge pipes 24 via a conduit 25, so that the air discharged from the air compressors is transferred from the air discharge pipes 24. By releasing the air toward the outer peripheral surface of the auxiliary table 10, the released air can cause the tip of the piece W to be sewn hanging down from the rear edge of the auxiliary table 10 to slide along the outer surface of the auxiliary table 10. The same effect as in the above embodiment can be obtained by holding the sewing piece W in pressure contact with the outer surface of an endless belt 11 disposed in the sewing machine and rotating the sewing piece W by sliding the endless belt 11 by an electric motor.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of the suturing device seen from the front, Fig. 2 is a partial perspective view of the suturing device seen from the rear, Fig. 3 is a plan view of the suturing device excluding the sewing machine mechanism, and Fig. 4 is an explanatory diagram showing the rotating action of the piece to be sewn, FIG. 5 is an electrical control block circuit diagram,
FIG. 6.7.8 is a partial perspective view showing another embodiment. Sewing machine...1, Swivel means...11,1
3.15°Ml, control means...Block circuit in Figure 5.

Claims (1)

[Claims] 1. A feeding mechanism for feeding a piece to be sewn, which has a plurality of edges that touch each other at an angle, along a fabric support surface so that one edge moves along a predetermined direction, and a stitch is sewn along the edge. a sewing machine having a seam forming mechanism for forming a seam;
It is arranged on a cloth support stand or a position close to it so as to be able to act on the piece to be sewn, and can operate so as to rotate along the surface of the cloth support stand around the sewing point or a point close to it while holding the piece to be sewn by airflow. a rotating means; and a control means for operating the rotating means to rotate the piece to be sewn in relation to completion of stitching of one edge of the piece to be sewn until another edge coincides with the cloth feed direction line. Suturing device.