JP2656373B2 - Empty ring holding device of overlock sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for holding an empty ring of an overlock sewing machine, and more particularly, to automatically form an empty ring in an overlock sewing machine so that the empty ring is involved. The present invention relates to an empty ring holding device of an overlock sewing machine that is held at an appropriate position.

[Prior Art] Generally, in an overlock sewing machine, in order to ensure that an empty ring is entangled in a stitch formed on the back surface of a cloth, an empty wrapped around a needle plate before sewing is started. It is necessary to stretch the annulus, cut it to a suitable length and then hold it in place by a clamping device.

Conventionally, the setting work of this hollow ring has been performed manually by an operator. However, since the working efficiency is low and uniform sewing product quality cannot be obtained, it is described in JP-A-2-71789. Such a device has been considered. In the apparatus, as shown in FIGS. 3 and 4A, the sewing machine 1
The cloth W set on the sewing machine is trimmed with a trimming knife 7 provided in front of the needle plate 5 in the sewing direction while trimming the cloth edges. Then, when the sewing is completed, the empty ring a is cut by the thread trimming knife 17 provided in front of the needle plate 5 in the sewing direction.
The cut end is connected to the suction pipe 9 connected to the air pipe 8.
The sewing machine is operated while being sucked into the inside, and an empty ring having a predetermined length is formed in the suction pipe 9. Thereafter, the empty ring suction pipe 10 is rotated by a pipe rotation mechanism A to be described later, and the suction port 10a formed at one end of the pipe 10 is moved from the first position P1 (initial position) shown in FIG. 4 As shown in FIG. 4 (B), it is moved to the second position P2 near the needle plate claw 6 to suck the empty ring a formed in the empty ring suction pipe 9.

Next, the empty ring suction pipe 10 is returned to the third position P3 before the first position P1 by the pipe rotating mechanism. At this time, as shown in FIG. 4C, the empty ring a is positioned so as to diagonally cross the suction hole 12 formed in the empty ring holding base 11, so that the leading end portion is caused by the suction operation from the suction hole 12. As shown in FIG. 4 (D), it is pulled out from the empty ring suction pipe 10 and is sucked into the suction hole 12, and is fitted into the groove 13 formed on the upper surface of the empty ring holding base 11. Empty ring holder 11
Is moved in the left-right direction together with the rod 14 by the solenoid, and moves leftward as shown in FIG. 4 (E) with the empty ring a held after the suction operation by the suction hole 12 described above. . As a result, the empty ring a is held between the side surface of the empty ring holder 11 and the needle plate 3 and is pressed by the pin 16 elastically protruded through the spring 15 on the side surface of the empty ring holder 11. Is done. At that time, the empty ring suction pipe 10 returns to the initial position.

Thereafter, when the cloth W is set and the sewing machine 1 is driven, the empty ring a held by the pins 16 of the empty ring holder 11 is cut by the edge cutting knife 7 and sewn under the cloth W. Further, the leading end of the empty ring a that has not been sewn is sucked through the suction hole 12 of the empty ring holding base 11, and thereafter, the suction operation stops.

By the way, in the above device, the empty ring suction pipe 10
Is configured as follows. That is, this mechanism is used to
And a gear 18 meshing with the gear 19,
First and second air cylinders 20 for rotating the gear 18,
21 and the cylinder rod 20 of the first air cylinder 20.
a is attached to a mounting base 22, and a second air cylinder is connected to a rotation shaft 18a of the gear 18 via an arm 23 and a cylinder rod 21a of a second air cylinder 21. And the first and second
Turn on the air cylinders 20 and 21 of the cylinder rods 20a and 2
When 1a is sucked, the gears 18, 19 together with the arm 23 and the rotating shaft 18a
Rotates, and the empty ring suction pipe 10 rotates to the second position P2 shown in FIG. 4 (B). By turning off the first air cylinder 20 from that state, the gears 18 and 19 rotate in the opposite direction to the above, and the pipe 10 returns to the third position shown in FIG. 4 (C). , The second air cylinder 21 is also OF
F to move the empty ring suction pipe 10 to the initial position P1.
Return to.

[Problems to be Solved by the Invention] In the conventional device as described above, when the cloth is set from the state shown in FIG. As shown in FIG.
11 is ejected by a predetermined amount T, and an empty ring a is
It is necessary to limit the length of the hollow ring to be cut into the seam and wrapped around the seam. However, depending on the sewn product, if the end faces of the sewn product are aligned and pushed into the vicinity of the thread trimming knife 7 by hand, a sewing deviation may occur. In a device that requires such an operation, the empty ring holder 11 may jump out and hit the operator's hand, giving a great deal of anxiety to the operation.

Therefore, the present invention has been made in order to solve such problems, and in order to allow the overlock sewing machine to safely and reliably perform the winding of the hollow ring into the sewing product.
An object of the present invention is to provide an empty ring holding device of an overlock sewing machine that can automatically hold an empty ring at an appropriate position.

[Means for Solving the Problems] In order to solve the problems described above, according to the present invention, the hollow ring formed after the completion of the sewing is moved to a holding position on the near side of the needle, and held. In an overlock sewing machine that performs sewing by winding an empty ring held at the time of starting sewing into a seam formed in a sewing product, a trimming knife for trimming a cloth disposed on a front side of a needle plate claw of the needle plate. An empty ring holding table disposed near the holding position on the front side of the trimming knife; a first position for holding the empty ring in the empty ring holding table; An empty ring pushing member movable to a second position positioned so as to intersect with the cutting edge, and a suction unit formed in the empty ring holding table and sucking the empty ring moved to the holding position. The ring is sucked by the suction part When it is inserted, the empty ring pushing member is moved to the first position to hold the empty ring, and the empty ring pushing member is moved to the second position in connection with the start of the next sewing to remove the empty ring pushing member. A configuration was adopted in which the ring was positioned so as to intersect with the cutting edge of the edging knife, and cutting was performed with the edging knife.

[Operation] In such a configuration, the empty ring formed after the sewing is completed is delivered to the empty ring holding table on the near side of the needle and is held at a predetermined position. An empty ring pushing member movable to a first position for holding the empty ring and a second position for pushing the empty ring by a driving source such as an air cylinder is disposed in the empty ring holding table. A suction pipe for sucking the empty ring moved to the holding position is connected to the empty ring holding table. When the empty ring is sucked by the suction section, the pushing member is moved to the first position to empty the empty ring. After sewing the predetermined number of stitches during the next sewing, the sewing machine moves to the second position while holding the empty ring and cuts the empty ring. The winding length of the hollow ring wound in the stitch is determined according to the amount of movement of the hollow ring pushing member to the second position at this time. Therefore, the empty ring holder itself does not move at the start of the next sewing, and the pushing member provided therein pushes the empty ring, so that the empty ring holder is ejected for cutting the empty ring. Eliminates the need.

EXAMPLES Hereinafter, the present invention will be described in detail based on examples shown in the drawings.

1 and 2 show one embodiment of the present invention, in which the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted. I do.

1 (A) and 1 (B) show an empty ring holding device according to an embodiment of the present invention. This empty ring holding device is composed of an empty ring holding table 30, and this empty ring holding table 30 is provided with a concave portion 30a.
And the air cylinder 31 is fixed via a nut 37. An empty ring pushing member 33 is arranged in the empty ring holder 30 so as to be slidable in the empty ring holder. The pushing member 33 is fixed to a cylinder shaft 36 by a clamp screw 34, a collar 33a, and a nut 35. When air enters from the tube 32, the pushing member 33 moves in the left-right direction in FIG. 1, holds an empty ring at the position shown in the drawing, and can push the empty ring when moved to the right. . An empty ring suction pipe 40 is formed on the empty ring holding base 30 for sucking downward the empty ring moved to the holding position by the empty ring suction pipe 10 (FIG. 3). 41 is connected to supply a negative pressure to suck the empty ring downward.

The empty ring holder 30 is fixed to a base 39 of the air cylinder 31 by screws 38, and the base 39 is fixed to a lower mounting body by a set screw 42.
Fixed to 43. A cover 45 is provided on the empty ring holder 30. The cover 45 is arranged on the same plane as the needle plate 5 with a gap 45a along the cloth feeding direction provided between the cover 45 and the needle plate 5, thereby covering a moving member such as an empty ring pushing member or the like so that the cloth fits in or closes. In addition to preventing the hands from getting stuck, the negative pressure of the suction of the empty ring is made more efficient to prevent air leakage.

Next, the operation of the holding device thus configured will be described with reference to FIG.

The states shown in FIGS. 2 (A) to 2 (C) are the same as those in FIGS. 4 (A) to 4 (C), and when the sewing is completed, the thread trimming knife provided in front of the needle plate 5 in the sewing direction. Empty ring a at 17
The sewing machine is operated while sucking the cut end into the suction pipe 9 connected to the empty ring pipe 8, and the second machine is operated.
As shown in FIG. 7A, the cloth end sensor S counts the number of stitches after detecting the cloth end, thereby forming an empty ring of a predetermined length in the suction pipe 9. After this, the empty ring suction pipe
By rotating the pipe 10 by the pipe rotating mechanism A, the suction port 10a formed at one end of the pipe 10 is moved to the second position as shown in FIG. Inhale the empty ring a. While the air ring suction pipe 10 is started from the position shown in FIG. 2A to the position shown in FIG. 2B, the pushing member 33 is driven from the left position shown in FIG. 2B has moved to the position shown in FIG.

Next, when the empty ring suction pipe 10 returns to the initial position, it passes through the empty ring holder 30, and at this time, the empty ring a becomes the suction pipe 40 formed in the empty ring holder 30 as shown in FIG. Suction pipe to move diagonally across the top
The suction pipe from the end is empty and the suction pipe is sucked.
10 and the suction pipe 40 as shown in FIG.
It is sucked in. With this suction force, the empty ring enters the concave portion 30a from the gap 45a and presses against the collar 33a. At this time, the pushing member 33 moves to the left as shown in FIG. 2 (E), so that the empty ring a is held between the empty ring clamp screw 34 and the side surface of the empty ring holding base 30. Become. At this time, the negative pressure of the air ring suction pipe is released.

Thereafter, when the cloth W is set and the sewing machine 1 is driven to sew a predetermined number of stitches, the air cylinder 31 is operated, and the pushing member 33 is pushed rightward by the collar 33a as shown in FIG. The empty ring a is made to protrude by a predetermined amount in the concave portion 30a. At this time, the hollow ring is cut by the scalpel 7 together with the cloth, so that the length of the hollow ring wound around the seam can be regulated. In addition, since the negative pressure is applied to the empty ring suction pipe 40 simultaneously with the movement of the pushing member, the empty ring is pulled downward in a stretched state and is discharged to the outside. Sewing is performed by repeating the steps of FIGS. 2 (A) to 2 (F).

[Effects of the Invention] As described above, in the present invention, the empty ring formed after the sewing is completed is moved to the holding position on the near side of the needle and held, and the empty ring held at the start of the next sewing is held. In an overlock sewing machine in which a ring is wound around a seam formed on a sewing product and sewing is performed, a trimming knife for trimming a cloth disposed on a front side of a needle plate claw of the needle plate, An empty ring holding table disposed near the holding position on the near side, a first position for holding the empty ring in the empty ring holding table, and the held empty ring intersecting the cutting edge of the edge cutting knife. An empty ring pushing member movable to a second position to be positioned; and a suction portion formed in the empty ring holding base and sucking the empty ring moved to the holding position, wherein the empty ring is sucked by the suction portion. The empty ring The extruding member is moved to the first position to hold the empty ring, and the empty ring extruding member is moved to the second position in relation to the start of the next sewing, so that the empty ring is moved to the cutting edge of the trimming knife. A configuration is adopted in which they are positioned so as to intersect and cut with a scalpel knife.

Therefore, the empty ring pushing member moves to the first position when the empty ring is sucked by the suction portion and holds the empty ring, and holds the empty ring in connection with the next sewing start in the second state. In order to move to the position and position the empty ring so as to intersect with the cutting edge of the edge cutting knife, the empty ring is cut as the next sewing progresses.

At this time, the winding length of the hollow loop to be wound into the stitch is determined according to the moving amount of the hollow loop pushing member to the second position, and the hollow ring holding table itself does not move at the start of the next sewing. The hollow ring pushing member provided therein operates to push the hollow ring. Therefore, it is not necessary to pop out the empty ring holding base for cutting the empty ring as in the conventional case, and the sewing can be performed with peace of mind by the operator, and the space for entering the hand for sewing adjustment can be increased. Will be possible.

Further, in the present invention, when the pushing member is moved to the second position in relation to the start of the next sewing, the empty ring moves to the cutting edge of the trimming knife arranged closer to the needle than the empty ring holding table. Because of the crossing, this trimming knife cuts the blank ring at the same time as the cutting of the fabric edge accompanying the movement of the cloth during sewing.The shortest possible loop length of the blank ring is from the needle drop position to the trimming knife. Can be shortened to the same length as the distance.

Therefore, the length of the empty ring is adjusted so that the free end of the empty ring is firmly held and the length is short enough to prevent the seam from being frayed, and the entangled seam is immediately rolled up. Therefore, even if the cloth is moved in a direction intersecting the feeding direction, the blank ring does not protrude. It has excellent effects such as preventing seam fraying peculiar to chain stitches and obtaining high sewing product quality.

[Brief description of the drawings]

1 (A) and 1 (B) are a partially cutaway top view and a side view showing a configuration of an empty ring holding device, and FIGS. 2 (A) to 2 (F) show devices in each process of an empty ring holding operation. FIG. 3 is a top view showing the configuration of a conventional device, and FIGS. 4A to 4F are diagrams showing the components of the device in each process of an empty ring holding operation in the conventional device. FIG. 4 is an operation explanatory diagram showing the state of FIG. 10: Empty ring suction pipe 30: Empty ring holder 31 ... Air cylinder 33: Empty ring extrusion member 34 ... Clamp screw 40: Empty ring suction pipe

Claims (1)

(57) [Claims] An empty ring formed after the sewing is completed is moved to and held at a holding position on the near side of the needle, and the empty ring held at the start of the next sewing is formed on a sewing product. In the overlock sewing machine which wraps around the sewing machine and performs sewing, the trimming knife for trimming the cloth arranged on the front side of the needle plate claw of the needle plate, and the trimming knife arranged near the holding position on the front side of the trimming knife are arranged. Movable to a first position for holding an empty ring in the empty ring holding table, and a second position for intersecting the held empty ring with the cutting edge of the edge cutting knife. An empty ring pushing member, and a suction unit formed in the empty ring holding table and sucking the empty ring moved to the holding position, wherein the empty ring pushing member is moved when the empty ring is sucked by the suction unit. Move to position 1 While holding the empty ring, the empty ring extruding member is moved to the second position in relation to the start of the next sewing, so that the empty ring is positioned so as to intersect with the cutting edge of the edging knife, and cut with the edging knife. An empty ring holding device for an overlock sewing machine.