JPH0418554Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is based on the method of overlock stitching the edge of a cloth using an overlock sewing machine, and after forming the seam of the cloth part, the empty ring that is created in succession to the seam. This invention relates to an empty ring sewing device that is attached to the overlock sewing machine to cut the empty ring and sew the empty ring continuing from the needle drop into the seam of the next fabric.

[Conventional technology]

Generally, when overlock stitching is performed using an overlock sewing machine, when the seam formation is completed, an empty ring connected to the seam is created at the end of the fabric. Therefore, in conventional overlock sewing machines, an empty ring holding/cutting device is installed in front of the needle drop, which has an integrated cutting blade and a clamping member made of an elastic material. The worker brings the ring along with the fabric to the front side, presses it against the cutting blade, uses the cutting edge to cut it, and holds the free end of the cut empty ring with a clamping member to remove the empty ring left on the sewing machine side. By holding this empty ring on the upper surface of the throat plate and sewing it into the seam of the next fabric, it is possible to prevent the seam from fraying at the beginning of sewing without performing any special bar-tacking work.

In addition, in the above case, there is an inconvenience caused by the operator pressing the empty ring against the cutting blade, that is, the yarn making up the empty ring is cut unevenly due to the operator's carelessness, and as a result, the yarn is cut. When sewing the empty ring into the seam of the next fabric, the beauty of the seam may be spoiled, or the catch between the empty ring and the seam may be weak and insufficient. This causes the inconvenience of not being able to prevent fraying, so in order to eliminate this inconvenience, when the worker moves the fabric transferred to the rear of the needle entry part to the front side, it is necessary to prevent the fabric from passing through an empty ring connected to the fabric. An empty ring sewing device has been disclosed which detects this, drives a movable blade of an empty ring cutter based on this detection, and elastically presses and holds the cut empty ring. (Japanese Unexamined Patent Publication No. 175587/1987).

[Problem that the invention attempts to solve]

However, in the above-mentioned empty ring sewing device, in order to cut the empty ring that is created by connecting to the fabric, the operator has to move the fabric to the front side of the needle drop every time one piece of fabric is sewn. It had to be moved, which was a problem in improving work efficiency. Furthermore, as shown in the above-mentioned Japanese Patent Application Laid-Open No. 58-1775587, the conventional means for holding the cut hollow ring was provided on the throat plate in front of the needle drop, which caused a problem of interfering with cloth feeding. It was hot.

The present invention was developed in view of the above-mentioned problems, and it eliminates the need for the operator to move the fabric each time to cut and hold the loop, and furthermore, the cut loop can be used to sew the next fabric. An empty ring sewing device that allows sewing work to be made smoother, more efficient, and safer because the empty ring holding means that is held so that it can be sewn into the eye does not interfere with cloth feeding. The purpose is to provide

[Means for solving problems]

The empty ring sewing device according to the present invention, which has been made to achieve the above object, is an overlock sewing machine that forms a seam by overlock stitching at the edge of a fabric, and also creates an empty ring connected to the seam at the end of the fabric. A suction port of a suction tube connected to an air suction source on the side where the edge of the fabric passes with respect to the sewing axis and near the rear side of the needle drop portion of the throat plate; At the same time, an air ring cutting device is equipped with a cutting cut consisting of a fixed blade and a movable blade at this suction port, and an air pressure feeding pipe connected to an air supply source is connected to the suction tube of this air ring cutting device. A first blowing device which is connected to each other and blows out air from the suction port in a direction intersecting the sewing axis, and a nozzle tip of an air pressure pipe connected to an air supply source on the front side of the needle drop section. a second blow-out device that is directed towards the fabric table; an air ring introduction hole that is provided on the fabric table surface on the front side of the needle drop portion and penetrates through the back side of the fabric table; and a horizontal movement is possible near the bottom of the air ring introduction hole. a pair of clamping plates provided on the fabric table and pressed against each other by an elastic biasing force, and the clamping plate provided below the fabric table being moved horizontally against the biasing force to press and release the pressure contact and separate them. an empty ring clamping device consisting of a clamping force release part that can be used to release pressure, and an empty ring suction device comprising an air suction port of a suction cylinder connected to an air suction source opened upward below the clamping plate of the empty ring clamping device. The hollow ring connected to the seam is cut by the hollow ring cutting device, and the free end of the cut hollow ring is transferred to the hollow ring holding device side by the first blowing device and the second blowing device. While moving, the free end was suctioned by the empty ring suction device through between the empty ring introduction hole and the holding plate, and the empty ring whose free end was sucked by the empty ring suction device was held by the holding plate. It is something.

[Effect]

According to the present invention, the empty ring sewing device sucks into the suction port of the empty ring cutting device the empty ring created by connecting the seam formed by overstitching the edge of the fabric. Cut the sucked ring with a cutting cutter installed at the suction port and separate it from the fabric, and move the cut free end of the ring to the ring holding device using the first blowing device and the second blowing device. At the same time, the free end of the ring is sucked by the ring suction device through the ring introducing hole and between the pair of clamping plates of the ring holding device, which have previously opened and separated the mutual pressure contact against the elastic biasing force. By doing so, the free end of the hollow ring is guided below the fabric table through the hollow ring introducing hole and inserted between the pair of clamping plates. Thereafter, the pair of clamping plates of the hollow ring clamping device are brought into pressure contact with each other by an elastic biasing force, so that the free end of the hollow ring is held between the pair of clamping plates, and the hollow ring is held on the throat plate. It is.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated embodiments.

The empty chain sewing device shown here is constructed around a throat plate 2 fitted into a fabric guide table 1 of an overlock sewing machine. The sewing shaft 3 shown by a dashed line in FIGS. 2A to 2C is a temporary blank line indicating a fabric feed line passing through the needle drop 2a of the throat plate 2, and the edge of the fabric is overlocked. The cloth is fed while being positioned on the outside of the sewing shaft 3 (on the right side in FIGS. 2A to 2C).

A ring cutting device 4 is attached near the throat plate 2. This ring cutting device 4 includes a suction tube 5 having a suction port 5a opened outside the sewing shaft 3 and near the rear side of the needle drop portion 2a and connected to an air suction source (not shown); It consists of a cutting cutter 6 equipped at the suction port 5a. This cutting cutter 6 has a fixed blade 6a fixed to the suction port 5a.
and a movable blade 6b driven by a member linked to the main shaft of the sewing machine. In addition, as another example, the loop cutting device 4 may be configured so that the terminal end of the fabric is located at the needle drop portion 2.
The number of needle movements after passing through point a may be counted, and the sewing machine may be stopped when the number of needle movements reaches a set number, and then the movable blade 6b may be activated by a solenoid or the like, or the operator may However, after confirming that the required length of the empty ring has been created, it may be activated by operating a pedal, etc. In any case, the air suction source must be activated first, and then the second A
As shown in the figure, an empty ring B connected to the end of fabric A
is sucked into the suction port 5a, and then the movable blade 6b is driven to cut the sucked empty ring between it and the fixed blade 6a. By this cutting, the empty ring B
With the cut portion as a free end, the needle is connected to sewing elements such as the tongue bar 2b and the needle 7 formed in contact with the needle drop portion 2a of the throat plate 2.

As shown in FIGS. 2A to 2C, a first blowing device 8 is arranged in parallel with the suction tube 5 of the ring cutting device 4, and this first blowing device is connected to an air pressure supply source (not shown). ) and a nozzle 10 provided at the tip of the air pressure feed pipe 9.
Consisting of The tip of this nozzle 10 is set near the needle drop side of the suction port 5a of the ring cutting device 4,
It is oriented in a direction intersecting the sewing shaft 3.
Therefore, after cutting the empty ring with the cutting cutter 6, when the first blowing device is activated to blow air out from the nozzle 10, the free end side of the empty ring is attached to the sewing element such as the needle 7. The sewing shaft 3 is moved to the sewing shaft 3 side.

A second blow-off device 11 is provided on the sewing shaft 3 and on the rear side of the needle drop portion 2a, and sends air under pressure from an air supply source (not shown) to a nozzle through an air pressure feed pipe 12. It is ejected from 13.
The tip of this nozzle 13 faces toward the front side of the needle drop portion 2a. This second blowing device 11 is operated simultaneously with the first blowing device 8 after cutting the empty ring with the cutting cutter 6, or the second blowing device 11 is operated at the free end of the empty ring by the first blowing device 8. After being moved to the sewing shaft 3 side, the free end of the empty ring B is moved to the front side of the throat plate 2 by operating in exchange with the first blowing device 8.

On the fabric table 1 in front of the throat plate 2, there is an empty ring introduction hole 1a penetrating through the back side of the fabric table 1.
A hollow ring is provided below the upper surface of the throat plate 2, including below the hollow ring introduction hole 1a, to sandwich the free end of the hollow ring B moved by the second blowing device 11. A clamping device 14 is provided. This empty ring clamping device 14 includes a pair of clamping plates that are pressed against each other by an elastic biasing force, that is, fixed clamping plates (hereinafter referred to as fixed plates) 15.
a, a movable plate (hereinafter referred to as a clamping plate) 15b that is horizontally movable, an elastic pressure urging section 16, and a clamping force release section 17. The fixing plate 15a, the clamping plate 15b, and the elastic biasing section 1
6. Consisting of a clamping force release part 17. Fixed plate 1
5a and the holding plate 15b are connected to the empty ring introduction hole 1.
are arranged below the sewing shaft 3 with their contact surfaces (pressure contact surfaces in the case of the fixed plate 15a) being parallel to the sewing shaft 3, of which the fixed plate 1
5a is fixed by bolts 19 to a base 18 of the fabric table 1 which is integrated with the sewing machine body. The elastic pressure biasing section 16 includes a rod 20 that is fixed to the clamping surface of the clamping plate 15b and passes through the fixing plate 15a, a spring receiver 21 that is fixed to the base 18 and that the rod 20 passes through, and a spring receiver 21 that is fixed to the base 18 and that the rod 20 passes through. A roller bearing 22 fixed to the tip of 20 and a spring bearing 2
Compression spring 2 stretched between 1 and roller bearing 22
Consists of 3. Therefore, when no external force is applied to the elastic biasing portion 16, the clamping plate 15
b is fixed plate 1 due to the elastic biasing force of the compression spring.
5a. The squeezing force release portion 17 is pivotally connected to an air cylinder 25 fixed to the base 18 via a fixture 24, a tapered member 26 connected to a piston rod 25a of the air cylinder 25, and the roller bearing 22. The tapered surface 26a of the tapered member 26 is in contact with the roller 22a. The tapered surface 26
a is the piston rod 25 as shown in FIG. 2B.
When a is extended, the roller 27 is pressed against the biasing force of the compression spring 23, and the rod 20 is moved toward the pressure plate 15b, causing the piston rod 25a of the air cylinder 25 to retract, as shown in FIG. 2C. The shape is such that no external force is applied to the elastic pressure biasing portion 16 when the pressure biasing portion 16 is in the position of the pressure biasing portion 16.

Therefore, when the air cylinder 25 is controlled to extend the piston rod 25a, the clamping plate 15b fixed to the rod 20 is pressed against the fixed plate 1.
5a, and both face each other below the empty ring introduction hole 1a.

An empty ring suction device 27 is installed below the empty ring holding device 14. This empty ring suction device 27
The suction port 28a of the suction tube 28 connected to an air suction source (not shown) is connected to the fixed plate 1 of the empty ring clamping device 14 below the empty ring introduction hole 1a.
5a and the clamping plate 15b, and when operated simultaneously with the second blowing device 11, the second blowing device 11 moves the needle plate 2 forward. The free end of the empty ring B is sucked into the suction port 28a. Therefore,
When the clamping plate 15b of the ring clamping device 14 is separated from the fixed plate 15a and the ring suction device 27 is operated, the free end of the ring B moves between the fixed plate 15a and the clamping plate 15b. When the clamping plate 15b is brought into pressure contact with the fixed plate, the free end of the blank ring B is clamped between these two plates.

In the above configuration, the clamping plate 15b has a clamping part 15ba and a horizontal part 15 as shown in FIG.
It may be replaced with a pressure plate 15b made of bb.
This clamping plate 15b has a notch in a part of the fabric guide table 1 and throat plate 2, and a horizontal part 15bb that is integral with a clamping part 15ba facing the fixed plate 15a and that is flush with the throat plate surface is provided in this notch. The suction port 28a of the suction cylinder 28 is normally closed and the clamping force release part is activated.
It moves as shown by the dashed line in FIG. 3 to create an empty ring introduction port above the suction port 28a. By using the clamping plate 15b as shown in FIG. 3, it is possible to obtain a larger suction hole only during empty ring suction compared to the empty ring introducing hole 1a shown in FIG. 1, and the suction efficiency is increased. can be increased.

Furthermore, in the clamping force release section 17 shown in FIGS. 1 to 2C, the piston rod 25a of the air cylinder 25 is disposed in a direction perpendicular to the rod 20.
The wear cylinder 25 may be disposed on the same axis as the piston rod 25a, and the rod 20 may be moved forward and backward directly by the piston rod 25a without using the taper member 26 or the like.

The hollow ring sewing device configured as described above is
Needle 7 connects the empty ring created at the end of the fabric.
The empty ring cutting device 4 cuts the sewing elements, including the sewing elements, by leaving an appropriate length, and the free ends of the cut empty rings are transferred to the first blowing device 8 and the second blowing device 11.
It flies to the front of the throat plate 2 near the empty ring introduction hole 1a. At the same time, the free end of the empty ring is sucked from below by the empty ring suction device 27, and the air cylinder 25 is driven to extend the piston rod 25a of the empty ring holding device 14, which has been separated in advance. Fixed plate 15a and clamping plate 1
5b, and after insertion, the piston rod 25a of the air cylinder 25 is retracted to separate the fixed plate 15a and the clamping plate 15.
The free end of the empty ring is clamped between the tongue 2b and the empty ring holding device 14, which create the empty ring with sewing elements such as the needle 7.
It will be placed between. Therefore, when a new piece of fabric is set and overlock stitching is started on this fabric, the hollow ring is sewn into the seam on the underside of the fabric as the fabric is fed. At this time, since the free end of the empty ring is held by the empty ring holding device 14 by elastic biasing, the free end of the empty ring resists the urging force and escapes from the holding portion due to the feeding of the fabric.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and for example, as an empty ring clamping device, as shown in FIG. An empty ring clamping device 114 may also be used. This empty ring clamping device 1
No. 14 clamping plate 115 is attached to side surface 1 of base 120 on the back surface of cloth guide table 101 by bolt 118 with its longitudinal direction parallel to sewing shaft 3.
20a via a mounting piece 122 for an air cylinder 121, which will be described later. The elastic pressure biasing portion 116 is connected to the bolt 118 and this bolt 11.
The bolt 1 consists of a compression spring 119 fitted externally to the bolt 1.
18 and tighten the head 118 of this bolt 118.
a compression spring 11 between the pressure plate 115 and the pressure plate 115.
By tensioning the pressure plate 9, the pressure plate 115 is elastically biased in a direction in which it comes into pressure contact with the mounting piece 122. The clamping force release part 117 is connected to the base 120.
The air cylinder 121 is attached to the mounting piece 122 fixed to the side surface 120a of the air cylinder 121.
The tip of the piston rod 121a is brought into contact with one front end of the pressure plate 115 during retraction. Therefore, before operating the first and second blowing devices and the empty ring suction device, the air cylinder 121 is operated and the piston rod 121
When a is extended, this piston rod 121a
connects one end of the clamping plate 115 to the compression spring 11
9, the clamping plate 115 is separated from the mounting piece 122 fixed to the side surface 120a of the base 120 from the pressing part to the fixing part of the bolt 118, and the clamping plate 11
5 and the attachment piece 122 so that the free end of the hollow ring can be inserted. Further, when the piston rod 121a is retracted after inserting the free end of the hollow ring between the clamping plate 115 and the mounting piece 122, the free end of the hollow ring is clamped between the clamping plate 115 and the mounting piece 122. That will happen.

In addition, in the present invention, the means for determining the operation timings of the empty ring cutting device, the first blowing device, the second blowing device, the empty ring holding device, and the empty ring suction device include a counter that counts the number of hand movements. It may be a means using an electrical control method using a timer, or a limit switch corresponding to each component activated by the operator's pedal operation may be provided.
The actuating parts of each limit switch and the distances corresponding to these actuating parts may be made different, so that the actuation time of each limit switch is staggered. Any means may be used as long as the timing allows the free end of the ring to be held by the empty ring holding device.

[Effect of idea]

As is clear from the above explanation, according to the empty ring sewing device according to the present invention, there is no need to perform the troublesome work of moving the fabric to the front side of the needle drop after creating the empty ring. Work efficiency can be significantly improved. In addition, a loop clamping device including a pair of horizontally movable clamping plates and a clamping force release part is placed below the loop introduction hole provided on the fabric table surface on the near side of the needle drop.
It is possible to eliminate objects protruding onto the surface of the fabric table, and there is no obstruction to fabric feeding, making sewing work smoother and more efficient. Furthermore, if an empty ring clamping device or the like suddenly protrudes onto the fabric table surface, there is a risk of being surprised or injuring the worker by hitting his or her hands on it, but with this invention, such dangers are eliminated and the sewing This has the effect that work safety can also be ensured.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective explanatory view showing an embodiment of the hollow ring sewing device according to the present invention, Fig. 2A
2C to 2C are explanatory plan views illustrating the operating state, FIG. 3 is a plan view of essential parts illustrating another example of the clamping plate, and FIG. 4 is an explanatory plan view illustrating another embodiment. 4... Empty ring cutting device, 5... Suction tube,
5a... Suction port, 6... Cutting cutter, 8... First
Blowout device, 9... Air pressure feeding pipe, 10... Nozzle, 11... Second blowing device, 12... Air pressure feeding pipe, 13... Nozzle, 14, 114... Empty ring clamping device, 15b, 115 ...Press plate, 16,
116... Resilience urging section, 17, 117... Squeezing force release section.

Claims (1)

[Scope of Claim for Utility Model Registration] An empty ring sewing device attached to an overlock sewing machine that forms a seam by overlocking at the edge of a fabric and creates an empty ring connected to the seam at the end of the fabric. Then, open a suction port of a suction tube connected to an air suction source on the side where the edge of the fabric passes with respect to the sewing axis and near the rear side of the needle drop of the throat plate, and attach a fixed blade to this suction port. A hollow ring cutting device is equipped with a cutting cutter consisting of a movable blade and a movable blade, and an air pressure feeding pipe connected to an air supply source is connected to the suction tube of this hollow ring cutting device, and air is supplied from the suction port to the sewing machine. a first blow-out device configured to blow air in a direction intersecting the axis; a second blow-out device configured to have a nozzle tip of an air pressure pipe connected to an air supply source directed toward the front side of the needle drop; A hollow ring introducing hole is provided on the fabric table surface on the front side of the needle drop part and penetrates through the back side of the fabric table. a pair of clamping plates that are pressed into contact with each other, and a clamping force release part that is provided below the fabric table and can move the clamping plates horizontally against the urging force to press them and release the pressure contact and separate them. an empty ring clamping device; and an empty ring suction device formed by opening an upward suction port of a suction cylinder connected to an air suction source below the clamping plate of the empty ring clamping device; The hollow ring connected to the seam is cut, and the free end of the cut hollow ring is moved toward the hollow ring holding device by the first blowing device and the second blowing device, and the hollow ring suction device is used to move the free end of the cut hollow ring to the hollow ring holding device. An empty ring sewing device characterized in that the free end is suctioned between an empty ring introduction hole and a holding plate, and the empty ring whose free end has been sucked by an empty ring suction device is held by the holding plate. .