JPH0540875Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a ring control device for an overlock sewing machine, and is particularly concerned with a ring control device for an overlock sewing machine. This invention relates to an empty loop control device for a device that sews into the seam at the beginning of sewing.

[Prior Art] In overlock stitching using an overlock sewing machine, it is impossible to prevent the sewing thread from fraying by sewing an empty loop formed before the start of sewing into the overlock seam at the end of the fabric at the beginning of sewing. Japanese Unexamined Patent Publication 1973-
It is known from No. 128443 and Utility Model Publication No. 63-48583.

For example, Utility Model Application No. 63-48583 and related patent application No. 62-48583 filed by the present applicant.
In the device shown in No. 335236, a pipe for sucking in and blowing back the ring is provided on the cloth feeding side than the throat plate claw for forming the ring and on the edge side of the cloth than the sewing line.
At the end of sewing the fabric, the empty ring connected to the throat plate claw from the sewing end is sucked into the tube, and the empty ring is cut with scissors provided at the opening of the tube to separate the fabric from the sewing machine. The end that is sucked into the empty ring tube connected to the throat plate claw is blown back, moved to the fabric feeding side of the sewing machine, held almost along the sewing line, and then the edge of the starting edge of the next fabric to be sewn is drawn. The held empty ring is sewn into the overlock seam.

[Problems to be solved by the invention] However, in these devices, as shown in Fig. 3, the cut end TE of the cut empty ring TC connected to the needle thread claw is sucked into the tube TU. Later, when it is blown back in the direction of arrow A, as shown in Figure 3, empty rings and feathers get into the gap between the fixed blade SK and the movable blade MK that make up the scissors, and the opening TO of the tube TU. There was a problem that the liquid could not be expelled smoothly.

Therefore, the main purpose of this invention is to provide a device that can smoothly transfer the empty ring connected to the throat plate pawl to the front side of the sewing section and sew the empty ring to the sewing start end of the fabric without any hindrance. The goal is to provide the following.

[Means for Solving the Problems] The empty ring control device of the overlock sewing machine according to this invention has an empty ring suction control device located on the cloth feeding side than the throat plate claw for forming the empty ring and on the cloth cutting blade side than the sewing line. A tube for double blowback is opened, and a pair of scissors consisting of a movable blade and a fixed blade that swing in conjunction with the main shaft of the sewing machine is installed inside the opening, and the scissors are installed deeper inside the tube than the meshing part of the two blades. A shield is provided on the side to prevent the empty ring sucked into the pipe from entering the gap between the engaging parts when it is blown back from the inner depth to the outside of the pipe from both edges of the pipe. It is characterized by:

[Function] In the device configured as described above, the empty ring formed continuously at the sewing end of the fabric is cut with scissors provided at the opening of the tube and separated from the fabric. The cut end side of the empty ring connected to the needle plate claw side is sucked into the inner part of the tube. The cut end of this empty ring is transferred to the front side of the sewing section and sewn into the starting seam of the next sewing fabric, so when the cut end is blown back from the tube, the empty ring and its feathers are removed. The shield can prevent entry into the gap between the engagement parts of the scissors or entanglement with the ends of the scissors, and the work of sewing the empty ring can proceed smoothly.

[Example] An example of this invention will be described based on FIGS. 1 and 2. In other words, Figure 1 shows the main parts of an overlock sewing machine that is equipped with a device that can automatically sew an empty ring formed on the claw 2 of the throat plate 1 into the seam of the fabric to be sewn next. A pipe 4 for sucking in and blowing back the ring is provided on the cloth feeding side 2 and on the cloth cutting blade 3 side compared to the sewing line X.
The starting end 5 is closed, and a cross plate 7 is provided on the vertical side wall 6 along the cloth feeding direction near the starting end 5.
An opening 8 is provided at the same height as or slightly above.

The other end of this pipe 4 branches into a main pipe 9 and a branch pipe 10, as shown in FIG. are connected to the openings 8, respectively, and the empty ring can be sucked in or sucked in and blown back through the opening 8 by an automatic control device or switch operation.

Also, a scissor 13 consisting of a fixed blade 11 and a movable blade 12 is provided inside this opening 8, and the movable blade 12 is supported on the outside of the tube 4 and can swing in conjunction with the main shaft of the sewing machine. ing.

These double blades 11 and 12 are designed to engage with each other from the fabric delivery side, that is, from the back side of the tube 4 toward the opening 8 side, to ensure cutting of the empty ring, and also to ensure that the empty ring is cut when the two blades intersect. It is press-fitted so that it can be opened backwards and tilted.

In addition, a shielding body 15 made of a protrusion is provided on the inner side of the tube 4 beyond the gap 14 created at the engagement portion of the double-edged blades due to the opening, so that the empty ring sucked into the tube 4 can be When the double blades 11 and 12 of No. 4 are blown back to the outside of the tube from the inner depths, the blades are prevented from entering the gap 14 between the meshing portions of the double blades.

On the other hand, as shown in FIG. 1, a first blow pipe 16 is provided on the lower surface of the cross plate 7, and a nozzle consisting of a long hole 17 at its tip is connected to the opening 8 of the tube 4 across the sewing line The opening is made to face the claw 2, and air supplied from a pressurized air supply source (not shown) is ejected toward the claw 2.

Further, the throat plate 1 has a hollow ring holding portion 18 formed by cutting out a part of the front side of the cloth cutting blade 3. This hollow ring holding part 18 includes a first holding plate 18a and a second holding plate 18b.
Each of them can be rotated independently around the shaft 19, and when only the second clamping plate 18b is rotated clockwise, a gap is created between both clamping plates, and the empty ring is guided into the gap. After that, by rotating one of the clamping plates to close the gap, the empty ring can be grasped, and in this state, by further rotating both detail plates clockwise, the claw 2 extends to the clamping part 18. The empty ring is cut by the cloth cutting blade 3 when the sewing machine is operated.

Note that a vacuum suction pipe (not shown) is opened below the gap formed between the first and second clamping plates, and a second blow pipe (not shown) is opened above it toward the gap. This helps the empty ring being transferred by the first blow pipe 16 to be held by the empty ring holding part 18.

By using the device configured in this way,
The empty ring sewing work can proceed smoothly as follows.

First, when the sewing of the fabric is finished, empty rings TC are formed one after another around the claw 2 of the throat plate 1 following the seam, and the end of the fabric is connected to the opening of the tube 4 connected to the vacuum suction device. 8, the hollow ring TC is cut by the scissors 13, and the cut end TE of the hollow ring TC connected to the claw 2 cut from the fabric is sucked deep into the tube 4.

When the sewing machine is stopped at the needle top dead center manually or by an automatic control device based on a fabric end detection signal, the movable blade 12 stops at the position shown in FIGS. When the air is sent from the branch pipe 10, the cut end of the empty ring
The TE is guided by the shield 15 and smoothly blown back from the innermost part of the tube 4 to the outside of the tube as indicated by arrow B in FIG.

Then, the cut end TE of the blown-back empty ring is moved by the air flow discharged from the blow pipe 16 to the empty ring holding part 18 in front of the throat plate 1, where it is gripped, and the fabric to be supplied next. Prepare for sewing.

When new fabric is supplied, the cut end
The TE is sewn into the overlock seam at the beginning of the seam.

In addition, at an appropriate time immediately after you start sewing,
When the empty ring holding part 18 is moved in a direction away from the sewing line
The length can be determined as desired.

[Effects of the invention] According to this invention, the empty ring is blown back smoothly from the suction pipe, and the operation of sewing the empty ring in the overlock sewing machine can be carried out efficiently.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of an embodiment of this invention, FIG. 2 is an explanatory diagram of its operation, and FIG. 3 is an explanatory diagram of the operation of a conventional example. 1... Throat plate, 2... Claw, 4... Tube, 11... Fixed blade, 12... Movable blade, 13... Scissors, 15...
shield.

Claims (1)

[Scope of utility model registration request] A pipe for sucking in and blowing back the ring is opened on the cloth feeding side of the needle plate claw for forming the ring of the overlock sewing machine, and on the cloth cutting blade side of the sewing line,
A pair of scissors consisting of a movable blade and a fixed blade that swing in conjunction with the main shaft of the sewing machine is provided inside the opening, and a shield is provided further inside the tube than the engagement part of the two blades, so that the scissors are not sucked into the tube. An air ring control device for an overlock sewing machine, characterized in that when the empty ring is blown back from the inner depth to the outside of the pipe from both blades of the pipe, it is prevented from entering the gap between the meshing parts. .