TWI429802B - Sewing machine air ring suture method and air ring suturing device - Google Patents

Description

Empty loop stitching method for sewing machine and empty loop stitching device

The present invention relates to an empty loop stitching method and an empty loop stitching apparatus for a sewing machine which is suitable for sewing a cuff or a side seam of a knitted T-shirt, an outer garment, an underwear, or the like, a side seam of a panty or a shorts, or the like. More specifically, the sewing process is started by sewing the sewing ring formed by the stitch forming claws attached to the needle board at the end of the sewing of the sewn fabric, and the sewing start of the sewn fabric is started. The stitching is stitched in the suture, that is, the so-called back seam sewing, to prevent the sewing process of the sewing machine from being unthreaded at the beginning of the sewing, and the empty loop stitching device.

In the above-described empty-loop suturing device, as disclosed in Japanese Patent No. 3,567,274, the air ring formed by the suture forming claw portion connected to the needle plate is sucked into the air such as a vacuum pump outside the drawing at the end of the sewing of the sewn fabric. The source is disposed in the suction pipe of the empty ring cutting device on the side after the sewing direction of the needle drop portion, and is cut from the sewing cloth in the suction pipe, and the cut empty ring is transmitted through the air source. Occurs in the suction pipe and blows back from the suction port at the front end of the pipe to the air flow which is ejected in the opposite direction to the sewing direction. The right side of the needle plate can be used as a fulcrum to reciprocally drive the oscillating motion in the front-rear direction and suck and hold the blown air. By returning the empty ring suction nozzle of the empty ring, the cloth of the empty ring suction nozzle is fed from the position where the air ring is fed back to the vicinity of the base end of the needle forming claw portion of the needle plate. The position near the end cutting knife moves backward and passes through the intermediate stop position of the standby to the intermediate stop position. Retreating in a direction opposite to the direction in which the sewing is performed, the empty loop that is sucked and held by the suction ring suction nozzle is held in a stretched state on the proximal side of the needle drop portion, and is pulled into the suture of the sewing start end of the next sewing fabric and Stitching.

It is also known as disclosed in Japanese Patent Publication No. Hei 5-28160 or Japanese Patent Publication No. Hei 5-40877, which is shown in Fig. 11 in a direction opposite to the direction in which the sewing is performed from the suction port 11a at the tip end of the suction pipe 11. The air flow (air flow) ejected from the left side of the needle portion 14 (which shows a double needle but may be a single needle) 15 is sucked into the empty loop suction pipe 11 of the empty ring cutting device 10 and sewn from the air. The cloth-cut empty ring 12 passes through the left side of the needle 15 and blows back to the upper portion of the needle plate 13 which is obliquely forward to the left of the needle 15, and is blown from the end of the empty ring 12 which is blown back. The auxiliary air flow (auxiliary air flow) ejected from the air nozzle (not shown) provided on the left side of the needle drop portion 14 causes the end portion of the air ring 12 to be blown back to be traced as indicated by the thick arrow A. The empty ring holding device 16 provided on the right side of the needle plate 13 is moved and held by the holding device 16 on the near side of the needle drop portion 14, and the sewing start of the sewing cloth is started. Suture in the suture.

In the above-described conventional empty-loop suturing device, for example, the device disclosed in Japanese Patent No. 3,567,274 has a right side portion of the needle plate that covers the space between the forward receiving position of the empty ring and the forward direction of the sewing direction of the needle drop portion. The movable type air ring suction nozzle that can reciprocally drive the swing is not only complicated in structure, but also the movable air ring suction nozzle that reciprocally drives and swings on the right side of the needle plate is likely to be an obstacle to the sewing operation, and is easy for the operator to observe the sewing condition. And the problem of visual obstacles during sewing work.

On the other hand, due to Japan’s special fair 5-28160, or fairness Japanese Patent Publication No. 5-40877 or the like is known as a device in which the device is sucked back from the empty ring and cut in a direction opposite to the direction in which the sewing is performed, and even moves toward the end of the empty ring holding device side. All the empty ring movement processing is carried out by air flow, and the movable air ring suction nozzle is not required to be disposed, so that the structure is simple and the operation hinder or the visual obstacle disappears, and the problem of the former device can be solved, but the latter device still has the following problems. Not resolved yet.

That is, the latter device is finally shown in Fig. 12. The empty ring 12 formed by the suture forming claw portion 13a connected to the needle plate 13 is received by the left side of the needle 15 to the right side of the needle plate 13 which is provided on the proximal side of the needle drop portion 14. Since the empty loop holding device 16 is held, the needle thread 17 located in the needle drop portion 14 is bent by the empty ring 12 into an inverted U shape. Therefore, when the needle 15 moves up and down with the start of the sewing process, tension is generated in the needle thread 17, which tension may cause the portion 12a of the empty ring 12 that has moved to the right side of the needle drop portion 14 to be pulled back to the needle drop portion 14 side, if In this state, the needle 15 is lowered, and since the needle 15 is passed through the empty loop portion 12a in the pulled-back state to form the suture, the empty loop portion 12a is not sewn into the seam of the sewn fabric 18 as shown in FIG. In the line 19, there is a problem that sewing defects such as a pellet protrusion are left in the front edge portion 18e of the sewing start end portion of the sewing fabric 18.

The present invention has been made in view of the above circumstances, and provides a suture which can be surely and smoothly sewn into the sewing start end of the next sewn fabric in addition to simplification of the structure and elimination of obstruction or visual disturbance of the work. The empty loop stitching method of the sewing machine and the empty loop stitching device are aimed at.

In order to achieve the above object, the empty loop stitching method of the sewing machine according to the first aspect of the present invention is the sewing of the loop formed by the stitch forming claws connected to the needle plate at the end of the sewing of the sewing fabric. The inside of the suction pipe of the empty ring cutting device on the side after the direction is cut off from the sewing cloth in the suction pipe, and the air flow blown in the opposite direction to the sewing direction is used to cut the end of the cut ring. Blowing back toward the proximal side of the needle drop portion, the air ring retaining device provided on the proximal side of the needle drop portion holds the end portion of the air loop that is blown back and starts to sew with the second sewing fabric, and pulls An empty loop stitching method for a sewing machine which is inserted into a stitch of a sewing start seam end of the sewing fabric, wherein the front end side portion of the suction pipe of the empty ring cutting device is provided in a direction opposite to the sewing operation When the airflow is blown out in the opposite direction, it is moved and held at a position where the suction port of the suction pipe is largely opened, and when the airflow is blown in a direction opposite to the direction in which the sewing is performed, the airflow is moved to be blown back by the blown airflow. a movable plate-like cover member at a position where the upper portion of the needle plate between the needle and the cloth end cutting blade moves toward the proximal side of the needle drop portion or is extended to the needle plate a position at which one of the front end portions of the suture forming claw portion partially overlaps, and an empty ring guide having a lower end edge at a height position substantially the same as the upper surface of the needle plate and having a narrow upper and lower width is continuously formed at a front end portion of the front end portion in the sewing direction. The fixed plate-shaped cover member of the air inlet and the air inlet opening having a wide opening and closing width, the movable plate is blown by the airflow blown from the airflow outlet portion formed at the front end of the suction pipe of the air ring cutting device The cover member or the fixed plate cover member guides the end of the empty ring which is cut into the suction pipe of the empty ring cutting device, and the end portion is moved up and down with respect to the needle drop portion With In the vicinity of the proximal end of the suture forming claw portion, the upper portion of the needle plate between the cloth end cutting blades that cut the edge of the sewing fabric is swept back toward the proximal side of the needle dropping portion, and The auxiliary airflow that is intermittently ejected from the lateral side position to the obliquely forward side with respect to the empty loop blowing movement trajectory moves the end portion of the blown back moving ring to the holding position of the above-mentioned empty ring holding device maintain.

Further, the empty loop stitching device for a sewing machine according to the third aspect of the present invention is configured such that when the sewing of the sewing fabric is completed, the loop formed by the stitch forming claws connected to the needle plate is sucked into the needle drop portion. In the suction pipe of the empty ring cutting device on the side of the direction, the inside of the suction pipe is cut from the sewing cloth, and the air flow which is blown in the opposite direction to the sewing direction is used to cut the end of the cut ring. The proximal side of the needle drop portion is blown back, and the empty loop holding device provided on the near side of the needle drop portion holds the end portion of the loop which is blown back and moves, and starts to sew with the second sewing fabric, and is pulled in. An empty loop suturing device for a sewing machine in which a sewn thread of a sewn fabric is sewn and sewn, wherein an end portion of the suction ring of the empty ring cutting device is formed so as to be sucked into the suction pipe The end portion of the cut empty ring is cut along the end portion of the needle which is moved up and down with respect to the needle drop portion, and the end portion of the vicinity of the base end of the stitch forming claw portion is cut at the end of the cloth. The upper part of the needle plate between the knives The suction side of the suction needle is blown back to the moving air outlet portion, and the front end side portion of the suction pipe of the empty ring cutting device is moved and held by the suction pipe when the airflow is not blown from the airflow outlet portion. a position where the suction port is largely opened and is moved to the empty loop edge that is blown back by the blown airflow when being blown out from the airflow outlet portion a movable plate-like cover member at a position where the upper portion of the needle plate between the needle and the cloth end cutting blade is moved toward the proximal side of the needle drop portion or a claw for forming a suture with the needle plate One of the front end portions of the front portion is partially overlapped, and an empty ring guiding hole having a lower end edge and a lower vertical width at a height position substantially the same as the upper surface of the needle plate is continuously formed at the front end portion in the sewing direction. Further, the fixed plate-like cover member of the wide air ring suction port is provided at the side portion of the needle drop portion with respect to the empty ring blowing movement trajectory from the side of the sewing direction to the obliquely front side. The airflow is an auxiliary airflow discharge device that moves back to the end portion of the air ring that is moved to the near side of the needle drop portion by the airflow from the air outlet portion to the holding position of the airbag holding device.

An empty loop stitching method for a sewing machine according to the present invention, which is characterized by the above-described features, and an empty loop stitching device for a sewing machine according to claim 3, wherein the stitch forming claw portion connected to the needle plate is formed as described above The air ring that is sucked into the suction pipe of the air ring cutting device provided in the direction of the sewing direction of the needle drop portion and cut in the suction pipe is blown by the air outlet blown from the air outlet of the front end of the suction pipe. The upper portion of the needle plate between the knife and the cloth end cutting blade is blown back, and the end portion of the air ring that is blown back is moved to the auxiliary airflow which is intermittently ejected with respect to the air ring blowing back movement path to The empty ring holding device side on the near side of the needle drop portion is held by the empty ring holding device, sucked and cut from the empty ring, blown back in the opposite direction to the sewing direction, and even kept to the empty ring at the end thereof. The movement and the movement of all the empty rings on the device side are transmitted through the airflow, so there is no need to provide a movable air ring suction nozzle, etc., and the structure can be simplified and the obstacles or visual obstacles of the work can be eliminated. Improve workability.

Moreover, since the empty ring can be held in the empty ring holding device in a state where the empty ring passes through the right side of the needle without any interference with the needle thread, it is possible to surely avoid the occurrence of a situation in which the second sewing time passes through the empty ring. Therefore, the empty loop can be smoothly and smoothly sewn into the suture of the sewing start end of the next sewn fabric, and it is possible to surely prevent one of the empty loops from remaining in the front edge of the sewing fabric at the beginning of the sewn fabric. Significant effect of the occurrence of poor sewing.

The above-described auxiliary airflow ejecting apparatus of the sewing machine of the present invention, which is the above-mentioned invention, is provided with the above-mentioned auxiliary airflow ejecting apparatus of the sewing machine, and the auxiliary airflow ejecting apparatus of the sewing machine of the present invention is provided to be permeable to the needle at the side of the needle plate. a cap-shaped air valve in which the opening formed by the substantially identical plate is switched between the state of protruding toward the upper plate and the state of being retracted toward the lower side of the cloth, and the air flow for introducing the pressurized airflow into the air valve is introduced Preferably, the means is formed on the side wall of the upper end of the air valve, and when the air valve protrudes above the cloth plate, the pressurized air flow introduced into the air valve is preferably discharged along the airflow of the cloth plate and the needle plate.

At this time, the air valve is made to be ejected only when the auxiliary airflow is ejected when the end portion of the upper portion of the needle plate that is moved back to the needle and the cloth end cutting blade is moved toward the empty ring holding device side. The upper part of the board protrudes, and the rest of the sewing makes the air valve retreat to the lower side of the cloth board, so the air valve does not become a hindrance to the sewing, and the sewing cloth can be smoothly performed along the upper surface of the cloth board. Moreover, there is no swarf or the like that blocks the airflow ejection hole formed by the side wall of the upper end of the air valve, thereby affecting the movement function of the end of the air ring provided by the auxiliary airflow, even if it is long The use of the period is also sustainable and stable.

In particular, the cap-shaped air valve is configured to pass through a guide protrusion that protrudes outward in the radial direction from the outer peripheral edge of the lower end of the air valve, and is recessed in an air chamber formed below the valve holder fitted to the cloth plate. The guide groove of the inner peripheral wall portion is configured to be non-rotatable but movable up and down, and the discharge direction of the auxiliary airflow can be maintained as intended to ensure the effect of the empty-loop movement processing.

Further, in the empty loop sewing device for a sewing machine according to claim 3 of the present invention, the suction pipe of the empty ring cutting device is provided at a front end side portion thereof, and is provided to be normally moved and held at a position where the suction port of the suction pipe is largely opened. When the airflow from the airflow outlet portion is blown, the air ring that is moved back and forth by the airflow is moved to the vicinity of the needle plate portion between the needle and the cloth end cutting blade toward the needle drop portion. A movable plate cover member that moves the position of the guide is preferred.

At this time, when the air ring formed by the suture forming claw portion connected to the needle plate is sucked into the suction pipe of the empty ring cutting device, the movable plate cover member moves toward the rear side of the needle drop portion to ensure the suction. The large suction port at the front end of the pipe allows the empty ring to be sucked into the suction pipe without being mistaken and cut off at a predetermined length; and the movable plate cover member is moved when the cut empty ring is blown back by the blowing air flow. Move to the front side of the needle drop section and guide the empty loop to the proximal side of the needle drop section. Therefore, the empty loop can be blown back as far as possible and positioned securely between the needle and the cloth end cutting knife. section.

Further, the suction pipe of the above-described empty ring cutting device in the empty loop sewing device of the sewing machine of the present invention is fixed to the front end side portion and extended to the foregoing a plate-like cover member at a position where one of the front end portions of the claw portion of the needle plate is partially overlapped, and the front end portion of the fixed plate-like cover member is continuously formed in front and rear in the sewing direction to be substantially the same as the upper surface of the needle plate. The empty ring guide hole whose height position is the lower end edge and the upper and lower widths is narrower is more desirable than the empty ring suction port having a wide upper and lower width.

At this time, when the hollow ring formed by the suture forming claw portion connected to the needle plate is sucked into the suction pipe of the empty ring cutting device, the width of the end portion formed at the front end portion of the fixed plate-like cover member can be widened. The ring suction port causes the empty ring to be sucked into the suction pipe to be cut at a predetermined length; and when the empty ring is blown back from the suction pipe to the needle drop portion, it is guided to the needle forming claw portion of the needle plate. Near position above. Therefore, the empty ring that is not blown back is blown upward from the upper surface of the needle plate, and is wound around the claw portion of the lower side of the pressing member which is lifted from the upper surface of the needle plate when it is blown back, and can be cut along the needle and the cloth end. The needle plate of the narrow portion between the broken knives is surely and smoothly blown back. Further, since the cover member is fixed to the suction pipe of the empty ring cutting device, it can be configured to be simpler and lower in cost than when the movable plate cover member is used.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Fig. 1 is a schematic perspective view showing a whole of a double-needle edging sewing machine with an empty loop sewing device according to an embodiment of the present invention, and Figs. 2 and 3 are perspective views showing a configuration of a main part of the empty loop sewing device. In the empty loop suturing device of the present invention, the same components as those of the conventional empty loop suturing device shown in Figs. 11 to 13 are denoted by the same reference numerals, and their description will be omitted or simplified.

In Fig. 1, reference numeral 1 denotes a cloth board of a edging sewing machine M, and a needle plate 13 having a needle drop portion 14 and a thread forming claw portion 13a (refer to Fig. 2) is fixed to a predetermined position of the cloth sheet 1 at a predetermined position. The cloth cutting blade 2 for cutting the edge of the cloth is provided in the vicinity of the proximal end of the formation claw portion 13a (only the movable upper blade portion is shown in Figs. 1 and 2, and the fixed lower blade portion is omitted). Further, in addition to the pressing member 3 in the upper portion of the needle plate 13, a needle bar supported by the sewing machine head portion 4, a double needle 15 permeable to the needle dropping portion 14 with respect to the needle dropping portion 14 and a detecting needle plate are provided. (13) The photoelectric fabric sensor that allows the sewing machine M to rotate when the sewing fabric (dark state) is present (the illustration is omitted, as shown in the figure), and the direction of sewing with respect to the needle plate 13 An empty ring cutting device to be described later is disposed on the right side of the rear side of X, and an empty ring holding device 16 is provided on the right side of the needle plate 13 on the near side of the needle drop portion 14, and a needle plate on the proximal side of the needle drop portion 14 is provided. An auxiliary airflow (hereinafter referred to as auxiliary airflow) discharge device 5 is provided in the portion 1 of the panel near the left side portion of the left side portion 13.

As shown in FIG. 1, FIG. 2, and FIG. 3, the empty ring cutting device 10 is an empty ring 12 formed by the suture forming claw portion 13a connected to the needle plate 13 at the end of the sewing of the preceding sewing cloth (refer to 3) The suction port 11a at the tip end of the suction pipe 11 through the air tube (not shown) and the air hose 6 connected to the air source such as a vacuum pump outside the drawing is sucked into the suction pipe 11, and the suction ring is attached to When the knife (not shown) at the front end of the suction pipe 11 and the drive mechanism (not shown) move up and down, the knife 7 is cut off from the sewing cloth, and the reverse air flow generated in the suction pipe 11 is cut. The broken empty ring 12 is blown back to the side of the suction port 11a, and thereafter, the front end blowing portion 8a is moved toward the sewing direction from the air pipe 8 fixedly held by the right side surface of the suction pipe 11 connected to the air source. X is a flow of air blown in a substantially straight line in the opposite direction Y so as to be blown back to the vicinity of the needle drop portion 14 along the upper portion between the right needle of the double needle 15 and the cloth end cutting blade 2.

The left side surface of the front end of the suction pipe 11 of the empty ring cutting device 10 is provided with a movable type that can be slidably moved in the direction of the arrow xy in a certain range along the sewing direction X through the long hole 9 and the bolt-shaped guide 19. Plate cover member 20. The movable plate-like cover member 20 is configured such that the elastic force of the spring 21 stretched between the protruding piece 11b fixed to the side of the suction pipe 11 and the protruding piece 20a fixed to the side of the plate-like cover member 20 is normally used. The suction port 11a at the front end of the suction pipe 11 is moved and held at a position of a large opening, and when the airflow is blown from the front end outlet portion 8a of the air pipe 8, the extension of the pneumatic cylinder 22 overcomes the elastic force of the spring 21 toward the y direction. Sliding movement causes the empty ring 12 that is blown back by the air flow to move along the upper portion of the needle plate between the right needle of the double needle 15 and the cloth end cutting blade 2 toward the proximal side of the needle drop portion 14 .

Further, as shown in FIGS. 4 to 6, the auxiliary airflow discharge device 5 is provided with a circular opening 1a in the panel 1 which is substantially coplanar with the needle plate in the vicinity of the left side surface of the needle plate 13, A valve holder 24 that is disposed to be flush with the upper surface of the cloth 1 and has an air chamber 23 formed below is fitted to the opening 1a. The valve holder 24 is fixed to the bracket 26 by the bolts 27 and fixed to the bracket 26 by the bolts 25, and is connected to the center portion of the valve holder 24 to communicate with the aforementioned portion. The circular opening 24a of the air chamber 23, the cylindrical cap-shaped air valve 28 having the lower end open and having the auxiliary hollow flow discharge hole 28a formed at the upper end side of the opening 24a The guide groove 23a recessed in the inner peripheral wall portion of the air chamber 23 is fitted and held so as not to be rotatable but can be moved up and down (up and down) so as to protrude outward in the radial direction from the weir 28b formed from the outer periphery of the lower end thereof. The guiding protrusion 28c is engaged.

Further, a gas supply pipe 29 that is connected to the inlet portion of the air flow to the inside of the air valve 28 is connected to the air supply pipe 29 of the lower end of the air valve 28, and is connected to the air supply pipe 29 for introducing the pressurized air flow to the inside of the air valve 28. At the end of the passage 26a, between the upper wall portion of the air chamber 23 and the lower end 28b of the air valve 28, there is a compression spring 30 that biases the air valve 28 in the downward direction, and the compression pressure of the compression spring 30 is such that The air valve 28 is retracted from the auxiliary air flow discharge hole 28a toward the lower side of the cloth 1 as shown in FIG. 4, and the pressurized air is introduced into the air valve 28 through the tube 29 and the air supply passage 26a. The air valve 28 is caused to protrude above the cloth 1 by the auxiliary air flow ejection hole 28a as shown in FIG. 5, and the auxiliary air flow is close to the upper needle portion 14 along the upper side of the cloth plate 1 and the needle plate 13. The trajectory of the movement of the empty loop 12 that is blown back to the side is switched from the state in which the left side of the sewing progress direction X is obliquely forward.

Further, the above-mentioned empty ring holding device 16 is constituted by a pair of clamping members 16a, 16b which are openable and closable, and the pair of holding members 16a, 16b are transmitted through the cylinder 31 around the fulcrum shaft 32 in the arrow of FIG. The co-direction drive is swayable and moves to the right in a clamped state at the end of the empty ring 12 at a position where the arrow is swung in the direction of the arrow o, thereby guiding the empty ring 12 to the cutting end of the cloth end cutting blade 2. Guided and cut off.

The empty loop stitching operation by the overlock sewing machine having the empty loop stitching device constructed as described above will be described below.

When the sewing end of the preceding sewing fabric passes through the cloth sensor (outside the drawing) and the sensor becomes unmeasured (bright state), the suction pipe 11 of the empty ring cutting device 10 starts to be sucked and will be connected to the needle. The empty ring 12 formed by the suture forming claw portion 13a of the plate 13 is sucked into the suction pipe 11 from the suction port 11a, and the sucked empty ring 12 is moved up and down by the upper blade (not shown). The fabric is cut. Thereafter, the pressing member 3 is lifted off the upper surface of the needle plate 13, and the reverse air flow occurring in the suction pipe 11 is blown back to the suction port side. Then, the blown-back empty ring 12 is blown from the front end blowing portion 8a of the air tube 8 to the air flow which is blown in the opposite direction Y from the sewing direction X, along the right needle of the double needle 15 and the cloth end cutting blade 2 The upper portion of the needle plate 13 is moved back substantially linearly toward the proximal side of the needle drop portion 14.

Immediately thereafter, the air valve 28 that has been retracted into the auxiliary airflow discharge device 5 below the layout plate 1 is raised by the pressurized air introduced into the interior of the air valve 28 through the pipe 29 and the air supply passage 26a. As shown in Fig. 5, the auxiliary air flow ejection hole 28a protrudes above the cloth board 1, and the auxiliary air flow from which the auxiliary air flow ejection hole 28a is protruded is blown back relative to the proximal side of the needle drop portion 14. The empty ring 12 is blown obliquely forward from the left side position in the sewing direction X, whereby the empty ring 12 is moved to the side of the empty ring holding device 16 as shown by the thick arrow B in FIG. It is clamped between the pair of clamping members 16a, 16b, and the preparation for the next sewing is completed.

Next, the next sewing fabric 18 (refer to FIG. 8) is set on the needle plate 13 so that the sewing start end leading edge 18e is substantially in the same line as the cloth edge cutting blade 7 in the sewing direction X, and the cloth is detected. After the device detects (dark state), the pressing member 3 is lowered to abut against the needle plate 13 to become the next slit. When the pedal is activated in this state, the sewing machine M starts to rotate, and the subsequent sewing fabric 18 is advanced in the sewing progress direction X until the sewing start end leading edge 18e reaches the needle drop portion 14 of the needle plate 13. The empty ring 12 of the suture forming claw portion 13a wound around the needle plate 13 during this period is still wound around the claw portion 13a.

Further, the subsequent sewing fabric 18 is sent to the sewing progress direction X and the sewing start end leading edge 18e exceeds the stitch forming claw portion 13a of the needle plate 13 to reach the leading edge from the sewing start end to the cloth edge. When the size of the blade 2 is a predetermined length, the pair of the holding members 16a and 16b of the empty ring holding device 16 are cut to the end edge of the cloth cutting edge 2 while the empty ring 12 is being held. The department moves to the right.

Thereafter, the empty ring 12 guided to the cutting portion of the cloth edge cutting blade 2 is cut by the blade 2 together with the side end portion of the sewing fabric 18, and the cut empty ring portion is pulled in subsequent The sewn fabric 18 is sewn into the suture of the beginning end and sewn.

In the above-described embodiment, the suture forming claw portion 13a connected to the needle plate 13 is formed and sucked into the suction pipe 11 of the empty ring cutting device 10, and is cut off. The ring 12 is blown back by the air flow along the upper portion of the needle plate between the needle 15 and the cloth end cutting blade 2, and the end portion of the air ring 12 that is blown back is caused by the auxiliary air flow ejection device. The auxiliary air flow ejected from the discharge hole 28a of the fifth portion is moved to the side of the empty ring holding device 16 on the near side of the needle drop portion 14, and is held (clamped) by the empty ring holding device 16, and is sucked and cut from the empty ring 12. Breaking, blowing back in the opposite direction to the sewing direction, even to the side of the empty ring holding device 16 at the end of the empty ring The movement processing of all the empty rings that are moved and held is carried out through the air flow, so that it is not necessary to provide a movable empty ring suction nozzle, etc., and the structure can be simplified and the obstacle of the sewing operation or the visual obstacle can be eliminated to improve the workability.

Further, as shown in FIG. 7, the empty ring 12 is held by the empty ring holding device 16 in a state where the empty ring 12 passes through the right side of the double needle 15 without any interference with the needle thread 17, so that the second sewing hour 15 can be surely avoided. By the occurrence of the situation in the empty ring 12, as shown in Fig. 8, the empty ring 12 can be smoothly and smoothly sewn into the suture 19 of the sewing start end of the next sewn fabric 18, and the space can be surely prevented. One of the rings has a remarkable effect of occurrence of a sewing failure such as a pellet protrusion at the front edge 18e of the sewing start end of the sewing fabric 18.

Further, as described in the above embodiment, the movable plate cover member 20 attached to the suction pipe 11 of the empty ring cutting device 10 causes the movable plate cover member 20 to be formed in the suture to be connected to the needle plate 13. When the empty ring 12 formed by the claw portion 13a is sucked into the suction pipe 11, it moves to the rear side of the needle drop portion 14 to secure the large suction port 11a at the front end of the suction pipe 11, whereby the empty ring 12 can be surely sucked into the suction pipe. 11 is cut at a predetermined length; and the air ring 12 blown back to the suction port 11a of the suction pipe 11 by the reverse air flow is blown back by the air flow blown out from the front end blowing portion 8a of the air pipe 8 to make the movable type The plate-like cover member 20 is slidably moved in the direction of approaching the needle drop portion 14, whereby the empty ring 12 can be blown back as far as possible and positioned securely in a narrow portion between the needle 15 and the cloth end cutting blade 2.

Further, in the above-described embodiment, the movable plate cover member 20 attached to the left side surface of the front end of the suction pipe 11 of the empty ring cutting device 10 will be described. However, as shown in FIGS. 9 and 10, the fixed plate-like cover member 33 attached to the left side surface of the front end of the suction pipe 11 of the empty ring cutting device 10 may be replaced.

The fixed plate-like cover member 33 has a front end portion 33a extending to a position partially overlapping one of the front end portions of the suture forming claw portion 13a of the needle plate 13, and the end portion 33a is in the sewing direction before the extension. An empty ring guide hole 34a having a lower end edge and a lower width and a lower width are formed continuously on the front and rear sides of the needle plate 13, and an empty ring suction port 34b having a wide upper and lower width is formed, and the upper and lower widths are wide. An elongated hole 34c that induces the sucked empty ring to the cut portion of the upper blade and the lower blade 7 is continuously formed at the upper end portion of the rear end of the empty ring suction port 34b. Further, although the fixed plate-like cover member 33 is permeable to the longitudinal direction by the long hole 35 and the bolt 36, the initial position of the fixed plate-like cover member 33 is finely adjusted. The action is used without moving it at all.

When the fixed plate-shaped cover member 33 is used, when the empty ring 12 formed by the suture forming claw portion 13a connected to the needle plate 13 is sucked into the suction pipe 11 of the empty ring cutting device 10, it can be formed by The empty ring suction port 34b having a wide width of the front end portion 33a of the fixed plate-like cover member 33 allows the empty ring 12 to be surely and smoothly sucked into the suction pipe 11 to be cut at a predetermined length; and from the suction pipe 11 to the needle drop portion 14 At the time of blowing back, the empty ring 12 can be guided to a position near the upper side of the suture forming claw portion 13a of the needle plate 13. Therefore, the empty ring 12 which is not blown back is blown upward from the upper surface of the needle plate 13, and is wound around the claw portion of the lower side of the pressing member 3 which is raised from the upper surface of the needle plate 13 when it is blown back, and can be placed along the needle. The upper portion of the needle plate 13 between the narrow portion between the 15 and the cloth end cutting blade 2 is surely and smoothly blown back. Moreover, since the cover member 33 is fixed to the empty ring Since the suction pipe 11 of the apparatus 10 is sufficient, it can be configured to be simpler and lower in cost than when the movable plate-shaped cover member is used.

Further, as described in the above embodiment, the auxiliary airflow discharge device 5 can be switched between a state in which it is protruded upward by the opening formed in the panel 1 and a state in which it is retracted downward, and is formed on the side wall of the upper end portion thereof. The cylindrical air-shaped air valve 28 of the auxiliary air flow discharge hole 28 is used, so that the air valve 28 can be retracted under the cloth 1 during normal sewing, so that the air valve 28 does not become an obstacle to sewing. The sewing fabric can be smoothly formed along the upper surface of the cloth sheet 1, and there is no chip or the like blocking the air flow ejection hole 28a, thereby affecting the movement function of the end portion of the air ring provided by the auxiliary airflow, and it is sustainable even if it is used for a long time. Stabilization performs the air ring moving treatment provided by the air flow, but as can be seen in Patent Documents 2 and 3, the auxiliary air of the air nozzle for discharging the auxiliary air flow is fixed on the left side of the needle drop portion on the cloth board. A flow ejection device is substituted.

Further, in the above-described embodiment, the double-needle sewing machine M is illustrated. However, the same effect as described above can be exhibited even in a hem sewing machine which is applied to a plurality of pins other than the double needle.

1‧‧‧ cloth board

1a‧‧‧ openings

2‧‧‧Knife end cutting knife

5‧‧‧Assisted air flow ejection device

8a‧‧‧Air Flow Blowout Department

10‧‧‧Air ring cutting device

11‧‧‧Inhalation tube

11a‧‧‧Inhalation

12‧‧‧ Empty ring

13‧‧‧ needle board

13a‧‧‧Claws for suture formation

14‧‧‧ needle drop

15‧‧‧ needle

16‧‧‧Air ring retaining device

18‧‧‧Sewing fabric

19‧‧‧ stitching

20‧‧‧ movable plate cover member

28‧‧‧Air valve

28a‧‧‧Assisted air flow spout

29‧‧‧ Pressurized air supply pipe

33‧‧‧Fixed plate cover members

34a‧‧‧ Empty ring guide hole

34b‧‧‧Air ring suction

X‧‧‧Sewing direction

Y‧‧‧The direction of the sewing is opposite

Fig. 1 is a schematic perspective view showing the entire double needle hem sewing machine with an empty loop sewing device according to an embodiment of the present invention.

Fig. 2 is a perspective view showing the configuration of a main part of the same upper loop sewing device.

Figure 3 is a diagram showing the composition and movement of the main parts of the same upper empty loop suturing device A three-dimensional picture.

Fig. 4 is a longitudinal cross-sectional view showing the main part of the configuration of the auxiliary air flow ejection device in the same upper loop sewing device.

Fig. 5 is an enlarged longitudinal sectional view showing the main part of the operation of the auxiliary air flow ejecting apparatus.

Fig. 6 is a plan view showing an air valve which is a component of the auxiliary air flow ejection device.

Fig. 7 is a perspective view showing the main part of the state at the end of the empty ring moving action of the same upper loop sewing device.

Figure 8 is a perspective view showing the sewn product after the empty loop is sewn.

Fig. 9 is an enlarged perspective view showing the main part of a double needle wrapping machine with an empty loop sewing device according to another embodiment of the present invention.

Fig. 10 is a side elevational view showing the main part of the configuration of the empty ring cutting device in the same upper loop sewing device.

Fig. 11 is a perspective view showing the configuration and operation of a main part of a conventional empty loop suturing device.

Fig. 12 is a perspective view showing a main part of a state at the end of the movement of the empty loop of the conventional empty loop suturing device.

Figure 13 is a perspective view showing the sewn product after the empty loop stitching of the conventional empty loop suturing device.

2‧‧‧Knife end cutting knife

5‧‧‧Assisted air flow ejection device

12‧‧‧ Empty ring

13‧‧‧ needle board

13a‧‧‧Claws for suture formation

14‧‧‧ needle drop

15‧‧‧ needle

16‧‧‧Air ring retaining device

17‧‧‧ Needle thread

Claims (6)

An empty loop stitching method for sewing a sewing machine, in which an empty loop formed by a stitch forming claw portion connected to a needle plate is sucked into an empty loop which is provided in a direction in which the needle drop portion is sewn in the sewing direction of the sewing fabric. The inside of the suction pipe of the device is cut from the sewing cloth in the suction pipe, and the air flow blown in the opposite direction to the sewing direction causes the end portion of the cut empty ring to be blown back to the vicinity of the needle drop portion. Moving, the empty ring holding device disposed on the near side of the needle drop portion holds the end portion of the air ring that is blown back and moves with the sewing of the next sewing cloth, and is pulled into the sewing start end portion of the sewing cloth. The suture is sutured and stitched, and the side surface portion of the suction tube of the empty ring cutting device is moved and held by the suction pipe when the airflow is blown in a direction opposite to the direction in which the sewing is performed. When the mouth is opened at a large position and is blown out in a direction opposite to the direction in which the sewing is performed, the air is moved to the upper end of the needle plate between the needle and the cloth end cutting blade when the air is blown back by the blowing air. unit The movable plate cover member that is moved to the proximal side of the needle drop portion is extended to a position partially overlapped with one of the front end portions of the needle formation claw portion of the needle plate, and is sewn at the front end portion thereof. a fixed plate-like cover member having an empty ring guide hole having a lower end edge and a lower width and a wider upper and lower width, and a hollow ring suction port having a wider upper and lower width, which are formed at substantially the same height as the upper surface of the needle plate, is formed. Formed from the front end of the suction pipe of the aforementioned empty ring cutting device The blown airflow blown by the airflow outlet portion guides the movable plate cover member or the fixed plate cover member to the end portion of the empty ring that is cut into the suction pipe of the empty ring cutting device, and the end is cut The needle plate is placed on the needle plate between the cloth end cutting blades which are aligned with the end edge of the sewing fabric by the needle which moves up and down with respect to the needle drop portion and the vicinity of the base end of the claw forming claw portion Partially blowing back toward the proximal side of the needle drop portion, and blowing back the moving air trajectory from the side of the sewing direction to the side of the obliquely forward side with respect to the empty loop blowing movement trajectory The end of the ring is moved to the holding position of the aforementioned air ring holding device and held. The method for sewing an empty loop of a sewing machine according to the first aspect of the invention, wherein the auxiliary airflow is provided by an opening formed by a cloth plate that is transparent to a side surface of the needle plate and substantially flush with the needle plate. a cap-shaped air valve that switches between a state in which the cloth is protruded upward and a state in which it is retracted toward the lower side of the cloth plate, a gas flow introducing means that introduces a pressurized airflow into the air valve, and a side wall formed on the upper end of the air valve When the air valve protrudes above the cloth, the pressurized airflow introduced into the air is ejected along the airflow ejection hole of the auxiliary airflow ejection device of the airflow ejection hole which is ejected from the disk and the needle plate. An empty loop stitching device for a sewing machine is configured to suck an empty loop formed by a stitch forming claw portion connected to a needle plate at the end of the sewing of the sewing fabric, and to provide an empty loop on the side after the sewing direction of the needle drop portion The inside of the suction pipe of the cutting device is cut from the sewing cloth in the suction pipe, and the air flow blown in the direction opposite to the sewing direction is conventionally caused to bring the end portion of the cut empty ring to the vicinity of the needle drop portion. Blow back to move to be placed near the needle drop The side empty ring retaining device maintains the end of the empty loop that is blown back and starts to sew with the next sewing fabric, pulls into the stitching of the sewing start end of the sewing fabric, and is stitched, characterized in that The front end portion of the suction pipe of the empty ring cutting device is formed with a needle for moving the end portion of the empty ring which is cut into the suction pipe and moved up and down with respect to the needle drop portion, and is formed in the stitch formation. a portion near the base end of the claw portion, the upper portion of the needle plate between the cloth end cutting blades which are cut at the edge of the sewing cloth is blown back to the moving air blowing outlet portion near the needle dropping portion, the above space The front end side portion of the suction pipe of the ring cutting device is provided to be moved and held at a position where the suction port of the suction pipe is largely opened, and is blown out from the airflow outlet portion when the airflow is not blown from the airflow outlet portion. The movable plate is moved to a position where the upper portion of the needle plate between the needle and the cloth end cutting blade moves toward the proximal side of the needle drop portion by the air ring that is blown back by the blowing air flow. Cover member or extension to the foregoing a position at which one of the front end portions of the slit forming claw portion of the plate partially overlaps, and a front end portion is continuously formed at a front end portion in the sewing direction, and a lower end edge is formed at a height position substantially equal to the upper surface of the needle plate, and the upper and lower widths are narrow. a ring-shaped guide hole and a fixed plate-like cover member for a hollow ring suction port having a wide width and a wide width, and a lateral direction of the needle-dropping portion is provided on a side of the side opposite to the direction in which the air is blown back from the sewing direction. The position intersects obliquely forwardly to discharge the auxiliary airflow so that the end portion of the air ring that is blown back to the proximal side of the needle drop portion by the airflow from the air outlet portion is moved to the empty ring holding device Auxiliary air flow ejection device that maintains position and maintains. The air-loop suturing device for a sewing machine according to the third aspect of the invention, wherein the auxiliary airflow ejecting device includes: an opening that can be formed in a vicinity of a side portion of the needle plate and that is formed on a panel substantially flush with the needle plate a cap-shaped air valve that switches between a state in which the cloth is protruded upward and a state in which it is retracted toward the lower side of the cloth plate, a gas flow introducing means that introduces a pressurized airflow into the air valve, and an end wall formed on the upper end of the air valve And when the air valve protrudes above the cloth plate, the pressurized airflow introduced into the air is discharged along the airflow ejection hole of the cloth plate and the needle plate. The air-loop suturing device for a sewing machine according to the fourth aspect of the invention, wherein the cap-shaped air valve transmits a guide protrusion that protrudes outward in a radial direction from an outer peripheral edge of the lower end of the air valve, and is recessed in The inner peripheral wall portion of the air chamber formed below the valve holder fitted to the cloth plate keeps the guide groove in which the guide protrusion is engaged so as not to be rotatable but can move up and down. The open loop stitching device for a sewing machine according to the third aspect of the invention, wherein the movable plate cover member is configured to be fixed to a tab fixed on the side of the suction pipe and fixed to a side of the plate cover member. The elastic force of the spring between the protrusions moves the suction port of the suction pipe to a position of a large opening, and slides with the air force of the airflow outlet portion to slide against the elastic force of the spring when the air cylinder is blown out. The empty ring that is blown back is moved along the upper portion of the needle plate between the needle and the cloth end cutting blade toward the proximal side of the needle drop portion.