JPH02261489A - Method and apparatus for sewing tubular cloth edge by sewing machine - Google Patents

Abstract

PURPOSE:To prevent a cloth tube from vertical and horizontal vibrations, zigzagging, difficulty of shearing the end together with a rubber woven tube, slip to the rubber woven tube and elasticity loss of the rubber woven tube by gussetting the rear of one end edge of the cloth tube and contracting gradually the rubber woven tube until both tubes return to a rectangular form while sewing the rear of the one end edges of both tubes. CONSTITUTION:The outer peripheral surface of a rubber woven tube 33 is adapted to overlap with a portion of the inner peripheral surface of a cloth tube 32 to extend there along and have the distal end edge coinciding therewith so that the natural inner periphery of the cloth tube 32 is about two times that of the rubber woven tube 33. Both tubes are inserted from the front of fixed, movable and pivotable arms 13, 20, 36 paralleled to each other and suspended covering the upper surface of a needle plate 1 of a sewing machine. Then, the lower portion of the rubber woven tube 33 is slightly suspended and the lower portion of the cloth tube 32 is suspended further lower to provide both rectangular front and rear tubes. The drive of the sewing machine 12 is started by a control means to reverse a motor 31 and a screw shaft 17 so that the cloth tube 32 is gussetted and the distal end edge of the rubber woven tube 33 has the inner diameter reduced while both tubes being cut in the cloth feeding direction are linked.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The invention related to this patent application (hereinafter referred to as "the claimed invention") is applied to upper and lower cuffs and cuffs of clothing such as training wear.
To be used as a hem opening, an elastic knitted rubber tube with an outer diameter smaller than the inner diameter is inserted into the inner surface of a fabric tube made of stretchable knit fabric, etc., and is made by knitting rubber into the cloth along vertical lines. death,
Use an overlock sewing machine to overlock and sew the edges of both tubes with overlock stitches and folding stitches on the fabric tubes, and after matching the diameters of both tubes with one rotation of the stitches, the front and back sides of both tubes are aligned. In particular, the present invention relates to a technique for forming a rubber knitted tube by turning the inside surface into an outside surface so as to make the rubber knitted tube protrude outward in the longitudinal direction from the fabric tube so as to be suitable for the cuffs and hem openings of the above-mentioned garments. This invention relates to a method and device for sewing the edges of double-sided cloth.

[Conventional technology]

Conventionally, as shown in the JP-A-62-14885 invention for which the patent applicant of the present invention previously filed a patent application, a stretchable fabric tube and an elastic knitted rubber tube with a smaller diameter were placed in a horizontal state. , overlap the rubber knitted tubes along a part of the inside of the fabric tube so that both ends of the tubes meet, and align both tubes horizontally from the inside to the outside so that the rubber knitted tube is larger than its natural diameter. While expanding in the direction, both ends of both tubes are sutured.

However, in its natural state, the diameter of the fabric tube is 1.8 to 2 times larger than the diameter of the rubber knitted tube, so most of the fabric tube except for one edge sag due to its weight.
Due to the intermittent cloth feeding motion of the sewing machine's cloth feed teeth, the drooping part of the cloth tube and its surrounding area vibrates horizontally due to intense vertical movement and intermittent back and forth movement of the cloth feed.

Therefore, one end edge of the fabric tube to be sewn is on the left and right of the stitching position with a needle or the like in the fabric feed direction of the sewing machine.

This is a defect in which the sewing quality of the product deteriorates due to repeated violent reciprocating motions inward and meandering, resulting in one end edge of the fabric tube being S into the rubber knit tube and being sewn erroneously or sewn deeper than the required seam allowance. was causing

In addition, with conventional overlock sewing machines, the following steps are taken when overlocking the edge of the flat fabric cut using a chain stitch, while trimming the edge of the flat fabric parallel to the fabric feed direction. It is structured and acts as follows.

(1) In other words, the 1st rJ! As shown in Ja, the throat plate l
A plain cloth 2 (-dot chain & I) is placed on the throat plate 1, and the feed dog 4 moves vertically and horizontally from the feed dog groove 3 penetrating the throat plate L vertically, and the elastic force is applied thereto. press the presser foot (
(not shown), when the plain fabric 2 is sandwiched between the top and bottom and sent intermittently to the left along a straight line, the throat plate 1 is provided with a chain in cooperation with a louver (not shown) that is provided below and operates. A needle (not shown) that supplies and holds the needle thread that forms the seam works with the needle hole 5 that moves up and down, the louver, and the needle to form the seam with a constant width in the horizontal orthogonal direction to the cloth feeding direction. In order to continuously form the plain fabric 2 before it reaches the needle drop hole 5, it extends from the needle drop hole 5 toward the cloth feed direction and is inclined so as to become thinner, so that the cloth feed direction ratio is adjusted. As shown in FIG. 1, the tongue piece 6 is perpendicular to the horizontal plane and is provided on the same plane as the throat plate 1. As shown in FIG. A lower knife 7 is provided above and extends vertically below the throat plate l, and above the lower knife 7 there is a cutting section of the lower knife that moves up and down above and below the upper surface of the throat plate l in conjunction with the drive mechanism of the sewing machine. The upper knife 8, which is provided with a cutting blade 8a below that slides parallel to the cloth to shear the cloth, is subjected to the action of a cloth cutting machine such as a cloth cutting machine $j17.8 by an extension part 8b extending vertically above and below the throat plate l. Therefore, after the plain fabric edge 2a of the plain fabric 2 fed to the left by the feed dog 4 etc. reaches the upper and lower knives 7°8 in the fabric feeding direction in FIG. 1a, the upper and lower knives 7 of the plain fabric 2 The right front edge 2b on the opposite side of the needle droplet hole 5 from the parallel cut portions 7 and 8a of . They are formed sequentially and continue to be sent to the left.

(2) Also, after sewing the elastic knit fabric into a tube shape in advance, the soft tube fabric 10 (two points 1 & 11) is sewn into the first
In Figure a, it is expanded to the left and right, and the upper surface of the soft tube cloth 10 is placed on the upper surface of the throat plate 1, and the lower surface thereof is lower than the throat plate 1. Even if an attempt is made to place the front edge 10a of the sleeve cloth in front of the upper knife 8 in order to trim the front edge 10a of the sleeve cloth forward of the upper knife 8, the front edge 10a of the sleeve cloth will be cut in the extension part 8a of the upper knife 8. 8a
The needles stand upright above and below the upper surface of the throat plate l and become an obstacle, making it impossible for them to advance forward, but since the soft tube fabric 10 is flexible, as shown in Figure 1a, In the vicinity of the left and right sides of the upper knife 8, the intrusion part Jo is narrowed diagonally.
b are sequentially formed, and then the soft tube cloth 10 is rotated counterclockwise while being sent to the left by the operation of the feed dog 4, the recessed portion tab on the right side is rotated and moved to the left, and the cloth cutting mechanism After that, similar to the plain fabric 2, the stitches 9 are sequentially formed near the needle drop hole 5.

(3) After sewing a stretchy knit fabric into a cylindrical shape in advance, a cylindrical piece is made by sewing a linear rubber inside the end of the cylindrical fabric with an outer diameter smaller than the inner diameter. The double sleeve cloth 11 (three-dot chain line) into which the rubber Ml sleeve cloth is inserted is expanded from the inside to the outside, and the upper surface of the double sleeve cloth 11 is placed on the upper surface of the throat plate L, and the lower surface thereof is Even if an attempt is made to expand left and right below the throat plate l to surround the top, bottom, left and right of the throat plate 1, and to shear the front edge 11a of the double sleeve cloth 11 with the cloth cutting machines tlI7 and 8, the double The front edge 11a of the sleeve cloth 11 is made of a cylindrical stretchable knit cloth and a cylindrical rubber knitted cloth on its inner surface, which is harder than the flexible knit cloth due to tension due to expansion and the nature of the rubber. As shown in FIG.
Since it is not possible to touch the upright part of the upper surface and advance beyond it, the front edge 11a of the double-tube fabric 11 cannot be sheared as shown in (1, 2), and the fabric is fed. Chain stitches 9 were formed on uneven and uneven edges in the direction parallel to each other, resulting in deterioration of the quality of the sewing object.

(4) Therefore, in the conventional technique described above, the following defects occur in addition to the defects described above.

In other words, when a rubber knitted tube with a smaller diameter is superimposed on a part of the inner peripheral surface of a fabric tube made of stretchable knit fabric and one end edge of both tubes is sewn together, the two tubes are made of different materials. The fabric tube may slip against the rubber knit tube, making it impossible to sew smoothly (
A defect occurs. In addition, to solve this problem, if the rubber knitted tube is expanded to have the same inner diameter as the fabric tube, the inner diameter of the fabric tube is usually about twice the inner diameter of the rubber knitted tube. Because of this, the inner diameter of the rubber knitted tube is expanded approximately twice as much, so after stitching, the elasticity of the rubber is lost and the inner diameter becomes close to the expanded inner diameter, making it impossible to use it for cuffs of clothing, etc. A defect had occurred.

(5) In addition, in the above-mentioned conventional technology, the expansion of the fabric tube and the rubber knit tube is achieved by rotating the movable arm 17 in the counterclockwise direction, so that both tubes reach the apex near the throat plate l and the free end of the fixed arm 16. It is expanded into a right triangle with right angles nearby.

The cloth feeding at the apex portions of both cylinders is carried out as shown in FIG. It receives the force of being squeezed and fed into the upper and lower knives 8.7, but the cloth feed direction at the top is parallel to the cloth feed direction rather than diagonally like the one in front, and the cloth is fed in both directions. Because it is based only on the linear movement of the cloth presser foot and the feed dog 4 that pinch and feed the vicinity of the apex of the cylinder, the rotational feed at the front in the cloth feed direction at the apex and at the other end are not equal, and the front is bent diagonally. The waste does not move smoothly to the upper and lower knives 8.7, and even if the counterclockwise rotation angle of the moving arm 17 is increased to facilitate the feeding, the feed dog 4 is restricted to linear feed. This resulted in defects that made it impossible to obtain the required large cutting width.

(6) In addition, as shown in the invention of Japanese Patent Application No. 61-221661, which was previously filed by the applicant for the patent of this application, when a part of the fabric tube having an inner diameter larger than the rubber knit tube is suspended and sewn, the upper and lower In order to prevent vibrations caused by side-to-side movement, natural gravity is applied to the inner surface of the drooping part of the fabric tube using a round bar, etc., and since tension is always applied to the fabric tube when sewing, the inner diameter of the fabric tube is sewn with rubber knitting. When sewing while contracting to match the inner diameter of the tube, the tension caused by gravity becomes an obstacle and the stitching cannot be done smoothly. The rod cylinder had to be pulled out, and at that time, the sudden loss of tension caused defects such as the inability to suture smoothly.

[Problem to be solved by the invention]

The present invention provides upper and lower parts of the fabric tube of the prior art,
To provide a method and device for sewing the edge of a tube cloth in a sewing machine to prevent defects such as lateral vibration, meandering, difficulty in shearing the ends of the rubber knit tube, slippage against the rubber knit tube, and loss of elasticity of the rubber knit tube. The purpose is to

Arranged in a rectangular shape in the front and back in the orthogonal direction, expand the Gofu knitted tube horizontally from the inside to the outside beyond its natural inner circumference so that the fabric tube hangs slightly downward, and then open both tubes from above. When viewed from the front, it is a trapezoid with a wide front side, and one end edge of the fabric tube is adjusted so that the front inner circumference behind one end edge of the fabric tube matches the entire outer circumference behind one end edge of the rubber knit tube by one rotation of both tubes by cloth feeding. While gradually shrinking the rubber knitted tube until the back is shirred and both tubes return to their rectangular shape, work in sequence to sew up the rear ends of one end of both shoulders.

[Means to solve the problem]

In order to achieve the above object, the present invention is characterized by having the following configuration.

Along a part of the inner circumferential surface of the fabric tube, a part of the outer circumferential surface of a rubber knitted tube with a smaller diameter and elasticity is overlapped horizontally, and the fabric is fed by sewing the rear and upper part of one end edge of both tubes. Both cylinders are suspended downward in a natural state so as to feed in parallel to the cloth feeding direction, and are horizontal to the cloth feeding direction when viewed from above [Example] As shown in Fig. 2, the cloth is fixed to a table, etc. The overlock sewing machine 12 is provided with the throat plate l shown in FIGS. 1a and 1b projecting forward, and the throat plate 1 has the feed dog groove 3. Feed dog 4. Upper feed dog that operates faster than the lower feed dog 4 or a stationary presser foot (not shown), needle drop hole 5
．． Tongue piece6. A lower knife 7 and an upper knife 8 are provided to form a suture body, and a fixing arm I3, which is a so-called free arm that protrudes in front of the throat plate 1 and has four arcuate corners in a cross section, is fixed.

A flat, rectangular, box-shaped base 14 is fixed to the sewing machine 12 at a distance to the right, a guide shaft 16 is fixed to the left and right side plates 15a, b of the base 14 in front, and a screw shaft 17 is fixed to the rear thereof. are rotatably supported in parallel, and a guide stand 18 is supported on the base 14 in contact with it and fitted with a screw shaft 17 and a guide shaft,
A movable table 19 is fixed to the upper surface of the guide table 1B so as to be movable left and right by the forward and reverse rotation of a screw shaft 17.

The moving table 19 is provided with a drive mechanism for the moving arm 20 as follows. That is, the shaft 21 is vertically fixed at a position close to the throat plate l of the sewing machine 12 in the left-right direction, the movable arm 20 is fixed to the front of the shaft 21, and the arm 22 extending rearward is rotatably supported. Axis 2 of arm 22! Behind Nirimo is a moving platform 19.
A piston shaft 26 of a cylinder 25, which is rotatably supported by a vertically fixed pin 24 and whose internal piston reciprocates as air enters and exits, is mounted on a vertical pin 27.
An adjustment screw 28 is screwed into the free end of the arm 22 rearward of the bottle so as to be perpendicular to the horizontal direction.
A stopper 29 whose tip is fixed to the left side plate of the base 14
The adjustment nut 3o is screwed onto the opposite side of the stopper 29 in the middle, and the adjustment nut 3o is brought into contact with the arm 22.

Before the preparation work for suturing, the rotatable motor 31 that supports the screw shaft 17 and is fixed to the right side plate 15b of the base 14 is stopped, the guide table and the movable table 19 stand still to the left, and the cylinder 25 also stops, the arm 22 comes to rest at the clockwise rotation position, the tip of the adjusting screw leaves the stopper 29 and comes to rest, and the movable arm 20 comes to rest parallel to the fixed arm 13.

When preparing for suturing, the arm 22 is first actuated by only the cylinder 25 to project the piston shaft 26 to the left.
rotates counterclockwise, the adjusting screw 28 contacts the stopper 29, and the movable arm 20 is moved away to the right so that the front end is wider than the rear end relative to the fixed arm, and the motor 31 is then rotated. It rotates forward at high speed, uses the guide table 18, moves to the right together with the moving table 19, and then stops.

During sewing work on the sewing machine, the motor 31 is rotated in the reverse direction at low speed, the guide table 18 is moved to the left together with the moving table 19, and when the moving arm 20 reaches the state of the above-mentioned preparatory work, the motor 31 is rotated in the reverse direction at low speed. Stop 31.

To complete the suturing, the arm 22 is rotated clockwise with the cylinder 25 inactive, and the movable arm 20 is brought into contact with the fixed arm 13 in parallel, as shown in FIG. 2 before the suturing preparation work described above. to return to.

A substrate 35 is fixed to the sewing machine 12 and a driving device for a rotating arm 36 is provided on the left side opposite to the base 14 with the sewing machine 12 interposed therebetween.

In other words, a cylinder 38 is fixed to the base plate 35, and the cylinder 38 is provided with a piston shaft 37 that is linked to the reciprocating movement of the internal nohistone by the inflow and outflow of air. The rear end of the rotating arm 36, which is normally parallel to the left side of the fixed arm 13, is fixed to the right end of the lower side of the rotating arm 40, which is arranged along the lower surface of the sewing machine 12. The right end of the piston shaft 37 is rotatably supported in a pin 41 fixed in the middle of the upright side of the rotary arm 40, and an adjustment screw is installed at the rear end of the upright side of the rotary arm 40 so as to be perpendicular to the horizontal direction. Screw in 42 and attach the right end to board 3.
5, and on the opposite side of the adjustment screw 42 from the stopper 43 fixed to the stopper 43. Screw the lWi screw 44 into contact with the rotating arm 40.

Before the suturing preparation work, the cylinder 38 is stopped, the piston shaft 37 is retracted to the left, and the rotating arm 40 is rotated counterclockwise to stand still.
3, the rotating arm 36 is parallel to the fixed arm 3.

During suturing preparation work and suturing work, the cylinder 38 is actuated in synchronization with the cylinder 25 to project the piston shaft 37 to the right, and the rotating arm 40 is rotated clockwise to tighten the adjusting screw 42. By touching the tip of the rotating arm 36 with the stopper 43 and separating the front end of the rotating arm 36 to the left with respect to the fixed arm 13 by the same distance as the moving arm 20, both arms form a trapezoid with a wide front and a narrow rear. shall be.

When the suturing is finished, the cylinder 38 is made inactive in synchronization with the cylinder 25, the piston shaft is retracted to the left, the rotating arm 40 is rotated counterclockwise, and the right end of the adjusting screw 42 is moved to the stopper 43.
, and make the rotating arm 36 parallel to the fixed arm 13.

and the activation and deactivation of cylinders 25 and 38 and the motor 3
! The sewing machine 12 rotates in forward and reverse directions, and stops driving the sutured body and cutting body of the sewing machine 12 to control the state before the suturing preparation work, during the suturing preparation work, during the suturing work, and at the end of the suturing work. For this purpose, a control means consisting of an electrical control circuit connecting them is provided.

[Action of the invention]

The present invention is constructed based on the above-mentioned structure so as to produce the following effects as shown in FIG.

As shown in FIG. 3 al and bl, the outer circumferential surface of the rubber knitted tube 33 is overlapped along a part of the inner circumferential surface of the fabric tube 32 and one end edge of the front end is aligned, and the natural inner circumference of the fabric tube 32 is Rubber W
The fixed and movable rotating arm 13.20 shall be approximately twice that of l'j133, and both cylinders are parallel to each other.
．． 36 and hangs down to cover the upper surface of the throat plate 1 of the sewing machine, and at this time, the lower part of the rubber knitted tube 33 hangs down slightly, and the lower part of the fabric tube 32 hangs down further below, Both cylinders have a rectangular shape from front to back.

(2) Figure 3 a2. As shown in b2, the cylinder 25.38 is actuated and stopped by the control means, and the arm 22 is rotated counterclockwise until the tip of the adjustment screw 28 contacts the stopper 29, and the movement 1 rotation arm 20.36 When separated from the fixed arm 13 and held so that the front side is wide and the front side is narrow to form a trapezoid, the rubber knitted tube 33 is supported by both farms at approximately the natural inner diameter, and the fabric tube 32 is held at the +
The rotating arm 20 is supported in a hanging state in which the lower part is slightly raised compared to the state shown in FIG. The angle formed by .36 shall be adjustable.

(3) Figure 3 a3. As shown in b3, the remoter 31 is rotated forward at high speed and stopped by the control means, and the forward rotation of the screw shaft 17 causes the moving table 19 to move to the right along with the guide table 18, and the rubber knitted tube 33 moves to the right. The fabric expands to about 1.5 times its natural inner diameter and becomes taut. ! ! 132 is supported by each arm 13.20.36 with the lower part hanging slightly, and then the upper feed dog or presser foot, which differentially moves faster than the feed dog 4 below the sewing machine 12, is lowered. Preparation for suturing is completed by sandwiching both cylinders with the feed dog 4 of the throat plate l by elastic force.
The motor 31. By making the number of rotations of the screw shaft 17 adjustable, both cylinders are brought into the tensioned and hanging state as described above, and the trapezoidal shape is maintained.

(4) As shown in Figure b4 of the table 3, the control means starts driving the sewing machine 12, operates the feed dog 4, the faster upper feed dog, and the sewing mechanism of the upper knife 8, and rotates the motor 31 in the reverse direction. By rotating the screw shaft 17 in the opposite direction, the fabric tube 32 is shirred and the inner diameter of the front end edge of the rubber knitted tube 33 is reduced, and both tubes are cut in proportion to the cloth feeding direction and stitched together.

At this time, both cylinders are pulled by the control means into a trapezoidal shape with the front side wide and the tip narrow in the states shown in Fig. 3 a3 and b3, so that the front end edges of both cylinders in front of the upper and lower knives 8.7 in the cloth feeding direction As shown in FIG.
The fabric tube 32 is made of a rubber knit whose lower part is slightly sagging without tension, and 80% of its inner peripheral surface is expanded to about 1.5 times its natural inner diameter. Since it is in close and stable contact with the outer peripheral surface of the tube 33, it does not vibrate vertically and horizontally, and the rubber knitted tube 33 does not lose its elasticity.

In addition, the control means moves the movable arm 20 to the left to reduce the inner diameter of the rubber knitted tube, while only the fabric tube 32 is sent faster than the rubber knitted tube 33 by the upper feed teeth, causing it to contract in an uneven shape. To smoothly and stably overlock the front end edge of a tube.

(5) As shown in FIG. 3 b5, the control means continues to drive the sewing machine 12 and the motor 31 also continues to rotate in the reverse direction.
Fabric? While reducing the inner diameters of both front edges of J32 and the rubber knitting tube 33, the sewing machine 12 and the motor 31 continue to cut in the cloth feed direction while continuing to stitch.
and the movement 3 rotation arm 20.36 is shown in Fig. 3 a2.
．． It returns to the state g of b2, and the overlock stitches complete going around both front edges of both tubes, and the entire circumference of the fabric tube 32 is sewn to the same size as the entire circumference of the rubber knit tube 33 by shrink stitching. As a result, both cylinders are sewn together with uniform tension applied over the entire circumference, and the elastic force of the rubber & I cylinder 33 is not lost.

(6) As shown in Fig. 3 b6, the cylinder 25.38 is deactivated by the control means and its piston shaft 26.37 is
Move to the right or left and stop, release the tip of the adjusting screw 28.42 from the stopper 29.43, and move the moving 2 rotation arm 20.
36 and parallel to and close to the fixed arm 13 in Fig. 3 al.
, bl, and both cylinders return to their rectangular shapes.

At that time, the rubber knitted tube 33 loses tension and its lower part droops slightly, and the fabric tube 32 is also sewn to the rubber knitted tube 33 and its lower part droops slightly, so both tubes are connected to the needle Vi. , 1, fixed arm 13, moving 1, rotating arm 20.3
6 and can be easily pulled out toward the front, thereby completing the work.

3-2-3 Other Embodiments If the cylinder 25 is replaced by a solenoid that uses electromagnetic force instead of one that uses air, and the upper feed dog is replaced by a shirring device, the same effect will be produced.

3-3 Effects of the Invention The present invention has the above-mentioned structure and operates, and therefore has the following effects.

ill Since the fabric tube 32 does not vibrate vertically, horizontally, or meandering back and forth, it can be sewn accurately to the rubber knitted tube 32.

(2) The fabric 1'1J32 is sewn to accurately follow the rubber knitted tube without slipping against the rubber knitted tube by shrink stitching to its own rubber knitted tube 32 and successive reduction of the inner diameter of the rubber knitted tube. Ru.

(3) By pulling both the fabric tube 32 and the rubber knit tube 33 into a trapezoid shape with the front side wide and the front side wide, both front ends are inclined to extend diagonally forward with respect to the upper and lower knives 8 and 7. The edges can be reliably cut in the fabric feed direction.

(4) The inner diameter of the rubber knitted tube is sequentially reduced during one rotation of sewing, and the fabric tube is sewn with its entire circumference matching the same dimensions as the rubber knitted tube, so both tubes have uniform tension over their entire circumference. Since it is sewn, if used for the cuffs of clothing, etc., the contraction force will be uniform all around the circumference.

(5) The rubber knitted tube 33 has a diameter equal to 2 of the natural inner diameter of the fabric tube 32.
Although the inner diameter of the branch line is 1/1, the inner diameter is the same as that of the fabric tube (
Since the expansion is not expanded to approximately 1.5 times (approximately 2 times), but remains at approximately 1.5 times, the contraction force of both cylinders is good without losing elasticity.

(6) According to the movement 1 rotation arm 20.36, both the tension distance and the angle thereof can be adjusted together with the fabric tube 32 by expanding the rubber knit tube 32, so that it can respond to changes in the natural inner diameters of both ends.

(7) The expanded shape of the fabric tube 32 and rubber knit tube 33 is trapezoidal, with a small diameter near the rear seam and cut body and a large diameter toward the free end of the front fixed arm 13. The force sent from the rear side moves, and the cloth feed force along a straight line acts equally on the left and right sides of the rear, and the cloth is rotated and fed evenly and smoothly. Even if the width is small, the rear part of both cylinders in front of the cloth feed direction is smoothly and sufficiently squeezed and guided into the upper and lower knives 8.7, and then cut to the required and sufficiently accurate width. and a reliable overlock seam is formed.

[Brief Description of the Drawings] Fig. 1a is a plan view of the throat plate 1 of the overlock sewing machine, Fig. 1 is a front side view of the same as above, Fig. 2 is a plan view of the main parts, Fig. 3a 1- A3 is a plan view of the main parts showing the working order, and FIGS. 3 b1 to b6 are front views of the same as above.

Claims (11)

[Claims] (1) Along a part of the inner circumferential surface of the fabric tube, a part of the outer circumferential surface of the rubber knitted tube, which has a smaller diameter and has elasticity, is overlapped horizontally, and the upper rear and upper edges of one end of both tubes are sewn together. In order to feed the cloth parallel to the cloth feeding direction, both tubes are placed in a rectangular shape with the bottom hanging downward in a natural state and viewed from above in a horizontal orthogonal direction to the cloth feeding direction. The rubber knitted tube is expanded horizontally from the inside to the outside to be larger than its natural inner circumference so that it rises and slightly droops, and both tubes are shaped like a trapezoid with a wide front when viewed from above. With one rotation, the trapezoidal shape of both tubes is maintained and the rear edge of one end of the fabric tube is shirred so that the entire inner circumference behind one edge of the fabric tube matches the entire outer circumference behind one edge of the rubber knit tube. A method for sewing the edges of a tube cloth using a sewing machine, in which the rubber knitted tube is gradually contracted and the rear ends of one end of both tubes are sewn together. (2) Along a part of the inner circumferential surface of the fabric tube, a part of the outer circumferential surface of the rubber knitted tube, which has a smaller diameter and has elasticity, is overlapped horizontally, and the upper rear and upper edges of one end of both tubes are sewn together. and a cutting body that cuts the cloth parallel to the cloth feeding direction in front of the cloth feeding direction. Arrange them in a rectangular shape in front and back in the horizontal orthogonal direction to the fabric feeding direction, and move the waste knitting tubes from the inside to the outside beyond their natural inner circumference so that the fabric tubes rise downwards and hang slightly. By expanding horizontally, both tubes become trapezoidal with a wide front when viewed from above, and by one rotation of both tubes by cloth feeding, the entire inner circumference behind one end edge of the fabric tube becomes the entire outer circumference behind one end edge of the rubber-rimmed tube. While maintaining the trapezoidal shape of both tubes, pleat the rear edge of one end of the fabric tube, and gradually shrink the rubber knitted tube, cut and sew the rear edge of both tubes in order to match the shape of the tube. , How to sew the edges of tube fabric using a sewing machine. (3) The base of the suture body to be sewn while feeding the cloth in one straight line is fixed to the suture body, and the free end is then fixed horizontally orthogonally to the cloth feed direction and the base of the fixed arm protrudes forward in the direction of the cloth feed than the suture body. The free end is supported in front of the fixed arm in parallel with the fixed arm and protrudes forward so that the whole can be moved forward and backward in the cloth feeding direction, and the free end can be moved forward and forward in the cloth feeding direction centering on the base. The rotatable movable arm base is supported ahead of the sutured body in the cloth feeding direction, and the free end protrudes forward in parallel to the fixed arm, and can be rotated around the base to the front and back in the cloth feeding direction. A driving body that enables the movable arm to move in relation to the reciprocating motion of the rotating arm. A hand forward moving body and a front rotating body that enable the movable arm and the rotating arm to rotate in relation to the reciprocating motion. A part of the outer circumferential surface of the rubber knitted tube, which has a smaller diameter and elastic force, is overlapped horizontally along a part of the tube, and the rear upper part of one end edge of both tubes is fed to the sewn body in parallel to the cloth feeding direction. Both tubes are placed in a rectangular shape in the front and back in the horizontal orthogonal direction to the cloth feed direction when viewed from above, with the bottom hanging down in a natural state, and the rubber knitting tube is placed so that the fabric tube rises downward and hangs slightly. horizontally from the inside to the outside to be larger than the natural inner circumference, making both tubes a trapezoid with a wide front when viewed from above, and one rotation of both tubes by cloth feeding expands the entire inner circumference behind one end edge of the fabric tube. While maintaining the trapezoidal shape of both tubes, pleat the rear of one end edge of the fabric tube so that it matches the entire outer periphery of the rear edge of one end of the rubber knitted tube, and stitch the rear of one end edge of both tubes while gradually shrinking the rubber knitted tube. A control body for controlling a suturing body, a driving body, and a front rotating body in order to sequentially work so as to perform operations such as: (4) A sewn unit that overlocks one edge of the cloth while feeding the cloth in one direction in a straight line. A fixing arm that cuts one end edge of the fabric parallel to the cloth feeding direction of the sutured body in front of the cloth feeding direction.The base of the cutting body is fixed to the sutured body, and the free end thereof is horizontally orthogonal to the cloth feeding direction and protrudes forward. The base is supported in front of the sutured body in the cloth feeding direction, and the free end is protruded forward parallel to the fixed arm so that the entire body can be moved forward and backward in the cloth feeding direction. A movable arm base that can be rotated forward and backward in the feeding direction is supported in the forward direction of the cloth feeding direction relative to the sutured body,
A drive body whose free end protrudes forward in parallel with the fixed arm, and whose movable arm is movable in relation to the reciprocating movement of the rotary arm, which is rotatable from the front to the front in the cloth feeding direction around the base. A hand forward moving body and a front rotating body, each of which allows the moving arm and rotating arm to rotate in relation to reciprocating motion, and a rubber knitted tube with a smaller diameter and elasticity along a part of the inner circumferential surface of the fabric tube. A part of the outer circumferential surface of the two cylinders is overlapped horizontally, and the rear upper part of one end edge of both cylinders is connected to a sewing body and a cutting body that cuts the cloth in parallel to that direction in front of the sewing body in the cloth feeding direction. Both tubes are placed in a rectangular shape in front and back in the horizontal orthogonal direction to the cloth feed direction when viewed from above, so that the fabric tubes hang downward in a natural state so as to feed parallel to the cloth, and the fabric tubes rise downward and droop slightly. The rubber knitted tube is expanded horizontally from the inside to the outside to be larger than its natural inner circumference so that both tubes are shaped like a trapezoid with a wide front when viewed from above. While maintaining the trapezoidal shape of both tubes so that the entire inner circumference behind one end edge matches the entire outer circumference behind one end edge of the rubber knitted tube, the back of one end edge of the fabric tube is shirred and the rubber knitted tube is gradually contracted. A control body for controlling a sewing body, a cutting body, a driving body, and a front and front rotating body in order to sequentially cut and sew the rear ends of one end of both cylinders. Sewing position for fabric edges. (5) The natural inner circumference ratio of the polymerized fabric tube and rubber knit tube is 2:
3. The method of sewing a rim of a tube fabric in a sewing machine according to claim 1 or 2, wherein the inner circumference of the rubber knitted tube when expanded is 1.5 times the natural inner circumference. (6) A method for sewing a tube fabric edge in a sewing machine according to claim 1 or 2, wherein the horizontal distance when the rubber knit tube is expanded is changed. (7) The method of sewing tube cloth in a sewing machine according to claim 1 or 2, wherein the angle of the trapezoid when the rubber knit tube is expanded is changed. (8) In order to pleat one end edge of the fabric tube, the cloth feeding speed of the sewn body is made faster than that of the rubber knitted tube, in the sewing machine according to claim 3 or 4. Edge sewing device. (9) The sewing machine for sewing the edge of a fabric tube in a sewing machine according to claim 3 or 4, further comprising a shirring device for shirring one end edge of the fabric tube. (10) In the sewing machine according to claim 1 or 2, the sewing machine operates sequentially such that after sewing the rear ends of one end of both tubes, the rubber knitted tube is gradually contracted to return both tubes to a rectangular shape. How to sew. (11) After sewing the rear ends of one end of both tubes, the rubber knitted tube is gradually contracted to restore both tubes to a rectangular shape. 4. A device for sewing the edge of a tube cloth in the sewing machine according to item 4.