JPH0475690A - Empty ring holding device for overlock sewing machine - Google Patents

Abstract

PURPOSE:To automatically hold an idle chain stitch in a correct position by moving an extruding member to a first position and holding the idle chain stitch, when the idle chain stitch is sucked by a suction part. CONSTITUTION:In an idle chain stitch holding base 30, an idle chain stitch extruding member 33 is placed so that it can move so as to be freely slidable in the idle chain stitch holding base. In such a state, when air goes in from a tube 32, the extruding member 33 moves in the left and the right directions, holds the idle chain stitch, and when it moves to the right, the idle chain stitch can be extruded. Also, in the idle chain stitch holding base 30, an chain of stitch suction tube 40 for sucking the idle chain stitch moved to a holding position by an idle chain stitch suction pipe 10 to the lower part is formed, and to this suction tube 40, a hose 41 is connected and negative pressure is supplied, and the idle chain stitch is sucked to the lower part. Subsequently, when the idle chain stitch is sucked by a suction part, the extruding member 33 is moved to a first position and holds the idle chain stitch, and moves to a second position and cuts the idle chain stitch after sewing by a prescribed number of stitches at the time of the next sewing.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to an empty ring holding device for an overlock sewing machine, and more specifically, to an automatic ring holding device for an overlock sewing machine, in order to cause the empty ring to be rolled up in the overlock sewing machine. This invention relates to an empty ring holding device for an overlock sewing machine that holds the ring in a proper position.

[Prior Art] Generally, in an overlock sewing machine, in order to ensure that the hollow ring is wound into the seam formed on the back side of the fabric, the hollow ring is wrapped around the throat plate in advance before sewing starts. The ring must be stretched, cut to length, and held in place by a clamping device.

Conventionally, this empty ring setting work was done manually by workers, but the work efficiency was low and uniform sewing quality could not be obtained. Such a device is being considered. In this device, as shown in FIGS. 3 and 4 (A), the sewing machine 1 cuts the cloth W set on the cloth stand 2 with the hem cutting knife 7 provided in front of the throat plate 5 in the sewing direction. Overlock the edge of the fabric while trimming it evenly (. Then, when the sewing is finished, cut the empty Ffja with the thread trimming knife 17 provided at the front of the throat plate 5 in the sewing direction, and blow the cut end with air. The sewing machine is operated while suction is drawn into the suction pipe 9 connected to the pipe 8, and an empty ring of a predetermined length is formed in the suction pipe 9. After this, the empty ring suction pipe 10 is rotated by a pipe rotation mechanism A to be described later. By rotating the suction port 10a formed at one end of the pipe IO, from the first position PI (initial position) shown in FIG. 4(A) to the vicinity of the throat plate pawl 6 as shown in FIG. 4(B). the second of
It is moved to position P2, and the empty ring a formed in the empty ring suction pipe 9 is sucked in.

Next, the empty ring suction pipe 10 is returned to the third position P3, which is a position before the first position PI, by the vibrator rotation mechanism. At this time, the empty ring a is positioned diagonally across the suction hole 12 formed in the empty ring holding base 11 as shown in FIG. The ring is pulled out from the suction pipe IO and sucked into the suction hole I2 as shown in FIG. The empty ring holding stand 11 is configured to move in the left and right direction together with the rod 14 by means of a treid.
Move to the left as shown in Figure (E). 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 protruding from the side surface of the empty ring holder 11 via a spring 15. be done.

Also, at that time, the empty ring suction pipe 10 returns to its initial position.

After this, when the cloth W is set and the sewing machine I is driven,
The empty ring a held by the bottle 16 of the empty ring holding stand 11 is cut by the hem cutting knife 7 and sewn onto the lower side of the cloth W. Further, the tip of the air ring [a that has not been sewn in is sucked in through the suction hole 12 of the air ring holding base 11, and thereafter, the suction operation is stopped.

By the way, in the above device, the empty ring suction pipe 10
The pipe moving mechanism A that moves the pipe is constructed as follows. That is, this mechanism
The cylinder rod 20a of the first air cylinder 20 is equipped with a gear 19 to which O is fixed, a gear 18 that meshes with this gear 19, and first and second air cylinders 20 and 21 that rotate this gear 18. The mounting is such that the second air cylinder is connected to the base 22, and the cylinder rods 21a of 21 are connected to the rotation shaft 18a of the gear 18 via the arm 23, respectively. Then, the first and second air cylinders 20
．． 21 is turned ON and the cylinder rods 20a and 21a are sucked, the gear 18.1 is turned on together with the arm 23 and the rotating shaft 18a.
9 rotates, and the empty ring suction pipe 10 rotates to the second position P2 shown in FIG. 4(B).

Furthermore, by turning off the first air cylinder 20 from this state, the gears 18 and 19 rotate in the opposite direction to that described above, and the vibrator 10 moves back to the third position shown in FIG. 4(C). , by also turning off the second air cylinder 21, the empty ring suction pipe IO returns to the initial position PL.

[Problems to be Solved by the Invention] In the conventional device as described above, when setting the cloth from the state shown in FIG. As shown in figure (F), the empty ring holding stand 1
1 by a predetermined amount T, and cut it into the air using the edge cutting knife 7.
It is necessary to limit the length of the empty ring that is cut and wrapped around the seam. However, depending on the sewing item, if the end surfaces of the sewing item are not lined up and pushed by hand to the vicinity of the thread trimming knife 7, the stitching may be misaligned. In devices that require such continuous work, the empty ring holding stand If may fly out and hit the operator's hand, causing great anxiety during the work.

Therefore, the present invention has been made to solve these problems, and in order to safely and reliably wind the empty ring into the sewing material in an overlock sewing machine, the empty ring is automatically positioned at the appropriate position. An object of the present invention is to provide an empty ring holding device for an overlock sewing machine that can hold the ring in the overlock sewing machine.

[Means for Solving the Problems] In order to solve the above problems, in the present invention, the empty ring formed after sewing is moved to a holding position on the front side of the needle and held, and at the same time when the next sewing starts. The held empty ring is rolled into the sewing material and sewn.In the empty ring holding device of the Now Overlock sewing machine, the empty ring is held in the empty ring holding stand disposed near the holding position and the empty ring holding stand. an empty ring pushing member movable between a first position for pushing out the empty ring and a second position for pushing out the empty ring; and a suction part formed in the empty ring holding base for sucking in the empty ring moved to the holding position. When the ring is sucked in by the suction part, the push-out member is moved to the first position to hold the empty ring, and when the next sewing is performed, the push-out member is moved to the second position to hold the empty ring for a predetermined number of stitches. A cutting configuration was adopted.

[Operation] In such a configuration, the empty ring formed after sewing is delivered to the empty ring holding table on the front side of the needle and held at a predetermined position. An empty ring pushing member is disposed within the empty ring holding table, and is movable by a drive source such as an air cylinder between a first position for holding the empty ring and a second position for pushing out the empty ring. A suction pipe for sucking the empty ring moved to the holding position is connected to the empty ring holding stand, and when the empty ring is sucked by the suction part, the pushing member moves to the first
The second position is moved to hold the empty ring, and after a predetermined number of stitches have been sewn during the next sewing, the second position is moved to cut the empty ring. Therefore, the empty ring holder itself does not move when the next sewing starts, and the push-out member installed inside it pushes out the empty ring, so the empty ring holder can be popped out for cutting the empty ring. There will be no need.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

An embodiment of the present invention is illustrated in FIGS. 1 and 2, and the same parts in FIGS. do.

FIGS. 1A and 1B illustrate 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 stand 30, and this empty ring holding stand 30 has a concave portion 3.
The air cylinder 31 is fixed with a nut 37 having a diameter of 0a. Inside the empty ring holding table 30 is an empty ring pushing member 3.
3 is arranged so as to be slidably movable within the empty ring holder. This extrusion member 33 has a clamp screw 34
, the cylinder shaft 36 by the collar 33a and the nut 35.
Fixed. As air enters the tube 32, the push-out member 33 moves in the left-right direction in FIG.
Also, when you move to the right, you can push out the empty ring. In addition, the empty ring suction pipe 10 (
An empty ring suction pipe 40 is formed to suck the empty ring moved downward to the holding position by the method shown in FIG. 3), and a hose 41 is connected to this suction pipe 40 to supply negative pressure.
Let the empty ring be sucked downward.

The empty ring holding stand 30 is fixed to a base Φ 39 of an air cylinder 31 with a screw 38, and this base 39 is fixed to a lower mounting body 43 with a set screw 42. Further, a cover 45 is provided on the empty ring holding stand 30. This cover 45 covers the cloth moving member between it and the throat plate 5 to prevent the cloth or hand from getting caught, and also makes the negative pressure of the empty ring suction more efficient and prevents air leakage. ing.

Next, the operation of the holding device configured as described above will be explained with reference to FIG. 2.

The states shown in FIGS. 2(A) to (C) are as shown in FIG. 4(A).
This is the same as in ~(C), and when the sewing is completed, the empty loop a is cut with the thread cutting knife 17 provided in the front of the throat plate 5 in the sewing direction, and the cut end is connected to the air vibrator 8. Operate the sewing machine while drawing suction into the suction pipe 9, and as shown in Figure 2 (
As shown in A), the cloth edge sensor S forms an empty ring of a predetermined length in the suction pipe 9 by counting the number of times after the cloth edge is detected. After this empty ring suction vibe 10
is rotated by the pipe rotation mechanism A to move the suction port 10a formed at one end of the vibrator 10 to the second position and the first end as shown in FIG. Inhale the empty ring a. Sky ring suction vibe I
2(A) to the position shown in FIG. 2(B), the pushing member 33 moves from the left position shown in FIG. 2(A) to the left position shown in FIG. ) has moved to the position shown in the diagram.

Next, when the empty ring suction vibrator 10 returns to the initial position, it passes through the empty ring holding stand 30, and this space-time ring a is shown in FIG.
), the ring moves diagonally across the suction pipe 40 formed on the ring holding base 30, so the tip part pulls out from the ring suction vibrator 10 due to the suction operation from the suction pipe 40, and the second It is sucked into the suction pipe 40 as shown in Figure (D). Due to this suction force, the empty ring has a gap of 45
It enters the recess 30a from a and comes into pressure contact with the collar 33a. At this time, the pushing member 33 moves to the left as shown in FIG. . At this time, the negative pressure in the empty ring suction pipe is released.

Thereafter, the cloth W is set and the sewing machine I is driven to sew a predetermined number of stitches, and then the air cylinder 31 is activated and the push-out member 33 is moved to the collar 33a as shown in FIG. 2(F).
is pushed out to the right side, causing the empty ring a to protrude a predetermined amount within the recess 30a. At this time, the empty ring is cut together with the cloth by the knife 7, thereby making it possible to restrict the length of the empty ring that is caught in the seam. Further, since a negative pressure is applied to the empty ring suction pipe 40 at the same time as the pushing member moves, the empty ring is pulled downward in a taut state and is discharged to the outside. In this way, sewing is performed by repeating the steps shown in FIGS. 2(A) to 2(F).

[Effects of the Invention] As explained above, the present invention includes an empty ring pushing member movable between a first position for holding an empty ring and a second position for pushing out an empty ring within an empty ring holding stand; A suction part is formed in the empty ring holding stand and sucks the empty ring moved to the holding position, and when the empty ring is sucked by the suction part, a pushing member is moved to a first position to hold the empty ring. At the same time, when the next sewing is started, the sewing pushing member is moved to the second position for a predetermined number of stitches to cut the empty ring, so that the empty ring holding table itself does not move when the next sewing starts. A push-out member provided inside the ring pushes out the empty ring. Therefore, there is no need to pop out the ring holding stand for cutting the ring, allowing the operator to sew with peace of mind, and increasing the space available for sewing adjustments.

[Brief explanation of the drawing]

Figures 1 (A) and (B) are a partially cutaway top view and side view showing the configuration of the empty ring holding device, and Figures 2 (A) to (F) are the equipment in each process of empty ring holding operation. 3 is a top view showing the configuration of the conventional device, and FIGS. 4(A) to 4(F) are each part of the device in each process of the empty ring holding operation in the conventional device. FIG. 2 is an operation explanatory diagram showing a state of 0... Empty ring suction vibrator 0... Empty ring holding stand ■ - Air cylinder 3... Empty ring pushing member 4 - Clamp screw 0 - Empty ring suction pipe operation record - Diagram 2 Figure (B) Figure 2 (D) Figure 2 (C) Figure 2 (E) Figure 4 (B) Figure 4 (D) Figure 4 (E) Figure 4 (F)

Claims (1)

[Claims] 1) The empty ring formed after sewing is moved to a holding position on the front side of the needle and held, and when the next sewing starts, the held empty ring is rolled into the sewing material and sewing is performed. An empty ring holding device for an overlock sewing machine includes an empty ring holding stand disposed near the holding position, a first position in the empty ring holding stand for holding the empty ring, and a second position for pushing out the empty ring. an empty ring pushing member movable to the holding position; and a suction part formed in the empty ring holding base and sucking the empty ring moved to the holding position, and when the empty ring is sucked by the suction part, the pushing member is moved to the first position. An empty ring of an overlock sewing machine, characterized in that the empty ring is moved to a first position to hold the empty ring, and at the same time, when the next sewing starts, an extrusion member is moved to a second position and the empty ring is cut with a hem cutting knife. holding device.