JP3757336B2 - Sewing machine with empty ring stitching device - Google Patents

Description

  The present invention relates to a sewing machine with a ring stitching device that is applied to sewing such as cuffs and side-to-side alignment of knit T-shirts, outwear, and underwear, and side-by-side alignment of briefs and shorts. More specifically, the empty ring remaining at the end of the sewing of the preceding sewing fabric is drawn into the stitches at the sewing start end of the subsequent sewing fabric and sewn to prevent fraying at the sewing start end. The present invention relates to a sewing machine with an empty ring stitching device.

  Conventionally, as shown in FIG. 9, an empty ring 2 connected to a stitch forming claw portion 1 a of a needle plate 1 at the end of sewing of a preceding sewing fabric is provided as an empty ring stitching device via a venturi tube 3 and a hose 4. Pre-sewing fabric by an upper blade 6 and a lower blade 7 (see FIG. 10) sucked into the tip of the suction pipe 5 connected to an air source such as a vacuum pump (not shown) and attached to the tip of the suction pipe 5 An empty ring cutting device 10 that blows back the cut empty ring 2 in a direction Y opposite to the sewing progress direction X from the suction pipe 5 connected to the air source via the hose 8 and the joint 9; An empty ring that is connected to an air source (not shown) via a venturi pipe 12 and a hose 13 and is blown back from the suction pipe 5 of the empty ring cutting device 10 is disposed above the presser foot (not shown). 2 to receive and hold the suction (provisional position in FIG. 9) 1st position indicated by a line) and the air ring 2 in the sucking and holding state, the needle plate 1 is moved backward to the position near the cloth end cutting knife (not shown) near the base end of the seam forming claw portion 1a. The intermediate stop position (second position indicated by the solid line in FIG. 9) and the second sewing position are further retracted from the second position in the direction opposite to the sewing progress direction X and held by suction with the start of sewing of the subsequent sewing fabric. An empty ring suction nozzle that is movable between a retracted position (not shown in FIG. 9) that pulls the empty ring 2 toward the front side of the needle drop portion 1b of the needle plate 1 and draws it into the seam at the sewing start end of the subsequent sewing fabric. 11 and the empty ring 2 pulled to the front side of the needle drop portion 1b by the empty ring suction nozzle 11 is moved to the lower surface side of the presser foot and pulled into the seam at the sewing start end of the subsequent sewing fabric. Those configured to sew are known (eg patents Document reference 1).

  Japanese Patent Laid-Open No. 2003-144786

  In the conventional empty ring stitching device as described above, as clearly shown in FIG. 10, the empty ring 2 sucked and cut into the suction pipe 5 of the empty ring cutting device 10 is formed in the suction pipe 5. The air flow A1, which is jetted substantially horizontally from the front end opening 5a in the direction Y opposite to the sewing progress direction X, is blown back in a straight line in the direction Y opposite to the sewing progress direction X. The empty ring 2 is sucked into the pipe from the downward end opening portion 11a by the upward suction air flow A2 generated in the empty ring suction nozzle 11 located at the first position. The idle ring transfer action from the apparatus 10 to the idle ring suction nozzle 11 side is performed. At this time, by adjusting the flow rates of the air flow A1 and the upward suction air flow A2 which are ejected substantially horizontally in advance, the balance between the blow-back force and the suction force of the air ring is properly adjusted, It is possible to transfer to the suction nozzle 11 side.

  However, if, for example, the type of thread using wooly thread or thick thread as the thread forming the loop, or the length and density of the loop due to changes in the sewing speed, the weight of the loop increases, The balance between the blowback force and suction force of the air ring caused by both air flows A1 and A2 may be lost, and an error may occur in the action of moving the air ring from the air ring cutting device 10 to the air ring suction nozzle 11 side. As a result, there is a possibility that the empty ring 2 cannot be sewn into the seam at the sewing start end of the subsequent sewing fabric. To prevent this, both airs are used to correct the balance each time sewing is started. There is a problem that troublesome work such as adjusting the flow rates of the flows A1 and A2 must be taken.

  The present invention has been made in view of the above-described circumstances. When a thick thread or the like is used as a thread forming the empty ring, or when the weight of the empty ring increases as the sewing speed changes, the present invention Even if the balance between the return force of the ring and the suction force is lost, there is no need to correct the change. An object of the present invention is to provide a sewing machine with an empty ring stitching device that can be reliably performed.

In order to achieve the above object, the sewing machine with an empty ring stitching device according to the present invention sucks an empty ring connected to the stitch forming claw portion of the needle plate at the end of sewing of the preceding sewing fabric, and cuts it from the preceding sewing fabric. An empty ring cutting device that blows back the cut empty ring in a direction opposite to the sewing progress direction, an advance position that is arranged above the presser foot and sucks and holds the empty ring blown back from the empty ring cutting device, and subsequent sewing As the fabric starts sewing, it moves in the direction opposite to the sewing progress direction, and pulls the idle ring held by suction toward the front side of the needle drop section and retracts it into the seam at the sewing start end of the subsequent sewing fabric. A hollow ring suction nozzle that can be moved in position, and by moving the hollow ring pulled toward the front side of the needle drop portion to the lower surface side of the presser foot by this blank ring suction nozzle, Pull it into the seam and sew it The air ring sewn device with a sewing machine that is configured to,
When the air ring suction nozzle is positioned at the forward movement position, the air ring suction airflow that is blown out substantially horizontally from the air ring cutting device in a direction opposite to the sewing progress direction is directed to the downward end of the air ring suction nozzle. An auxiliary air flow outlet pipe that blows an air flow upward so as to change the flow toward the opening is provided.

  According to the sewing machine with a ring stitching device according to the present invention having the above-described characteristic configuration, the main flow of the ring-circulated backflow air stream that is ejected substantially horizontally from the loop cutting device in the direction opposite to the sewing progressing direction is Since the airflow blown upward from the auxiliary airflow blowing pipe is turned to the flow toward the lower end opening of the air ring suction nozzle, the properties of the air ring blown back from the air ring cutting device are, for example, woolly yarn or thick yarn Etc., and the balance and balance of suction force and suction force of the air ring due to both air currents, such as the length and density of the air ring and the weight of the air ring become heavier as the sewing speed changes. Even if collapse occurs, the empty ring blown back from the empty ring cutting device can be reliably and smoothly transferred to the suction nozzle side. Therefore, regardless of the nature of the empty ring, there is no troublesome work such as adjusting the flow rate of the airflow to balance the blow back force and suction force at the start of sewing, and the empty space generated at the end of sewing of the preceding sewing fabric is not required. There is an effect that the ring can be surely sewn into the seam at the sewing start end of the subsequent sewing fabric without mistake.

  In the sewing machine with an empty ring stitching device according to the present invention having the above-described configuration, as described in claim 2, the auxiliary airflow blowing pipe is integrally attached to the empty ring cutting device, so that The positional relationship between the airflow that is blown out substantially horizontally in the direction opposite to the direction of sewing and the auxiliary airflow that is blown upward is always kept constant, and the direction of the airflow is stable. And the above-described vacancy transfer action can be further ensured.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall schematic perspective view of an edge stitching machine with an empty ring stitching device according to the present invention, FIG. 2 is a perspective view showing a configuration of a main part of the empty ring stitching device, and FIG. 3 is a main portion of FIG. FIG. In the empty ring stitching device according to the present invention, the same components as those in the conventional empty ring stitching device shown in FIGS. 9 to 10 are denoted by the same reference numerals, and description thereof is omitted or simplified. To do.

  In FIG. 1, reference numeral 14 denotes a cross plate of an edge stitch sewing machine M. A needle plate 1 having a needle drop portion 1b and a seam forming claw portion 1a (see FIG. 2) is fixed to a predetermined position of the cross plate 14. A cloth edge cutting knife 15 (only the movable upper knife section is shown in FIG. 3 and the fixed lower knife section is omitted) is provided near the proximal end of the seam forming claw section 1a. . In addition to the presser foot 16, the needle plate 1 has a needle bar which can be driven to reciprocate up and down with respect to the needle drop portion 1 b via a needle bar supported by the sewing machine bed portion 17 and a needle clamp (these needles). Is not shown in the drawings, and the presence of the sewing fabric on the upper surface of the needle plate 1 is detected, and when the sewing fabric is present (dark state), the photoelectric fabric sensor 18 that allows the sewing machine M to rotate and the sewing start An air nozzle 19 that blows the air ring in the direction of the knife 15 and an air nozzle 20 that pushes the air ring into the lower surface of the presser foot 16 are provided. An empty ring cutting device 10 is disposed, and an empty ring suction nozzle 11 is disposed on the right side of the needle plate 1 so as to be able to drive and swing around a fulcrum rotation shaft 21. In front of the sewing machine Check ring pressing device 23 which is mounted through a mount 22 to the part 17 is arranged.

  As shown in FIGS. 2, 4, and 5, the empty ring cutting device 10 is configured to connect the empty ring 2 connected to the seam forming claw portion 1 a of the needle plate 1 to the venturi tube at the end of sewing of the preceding sewing material. 3. The upper blade 6 attached to the tip of the suction pipe 5 is sucked into the tip of the suction pipe 5 connected to an air source such as a vacuum pump (not shown) via the hose 4; After cutting from the preceding sewing fabric with the lower blade 7, the cut ring 2 is connected to the sewing progress direction X from the tip opening 5 a of the suction pipe 5 connected to the air source via the hose 8 and the joint 9. Is configured to blow back in the reverse direction Y.

  Further, as shown in FIGS. 2 and 6, the air ring suction nozzle 11 receives the air ring 2 blown back from the suction pipe 5 after being cut by the air ring cutting device 10. For cutting the fabric edge near the base end of the stitch formation claw portion 1a of the needle plate 1 with the forward holding position (first position indicated by the phantom line in FIGS. 2 and 6) and the air ring 2 in the suction holding state. An intermediate stop position (second position indicated by a solid line in FIG. 2 and an imaginary line in FIG. 6) that stands back and swings near the position of the knife 15 and the second position as the subsequent sewing fabric W starts to be sewn. A retracted position in which the idler ring 2 that has been swung back and forth in the direction Y opposite to the sewing progress direction X is pulled toward the front side of the needle drop portion 1b of the needle plate 1 and pulled into the stitch at the sewing start end of the subsequent sewing fabric W. (The third position is omitted in FIG. 2 and indicated by the solid line in FIG. 6). It has been.

  Further, the idle ring pushing device 23 includes an air cylinder 24 fixedly held on the mounting base 22 and an idle ring pusher 25 fixedly connected to the tip of the piston rod 24 a of the air cylinder 24. A substantially V-shaped empty ring hooking portion 25a is formed at the tip of the. As shown by the solid line in FIG. 1, the empty ring pushing device 23 normally stands by in a backward position at an obliquely upper right position of the needle plate 1 and the presser foot 16. As shown by the arrow in FIG. 1 in conjunction with the swinging movement from the second position to the third position, the tip of the tip is emptied by moving forward in a diagonally lower left direction Z that intersects the pulling path of the air ring 2. The ring hooking portion 25a is configured to push and displace a part of the empty ring 2 drawn to the front side of the needle drop portion 1b to the left side of the needle drop portion 1b.

  In addition, as shown in FIGS. 2, 4, and 5, the idle ring cutting device 10 includes an auxiliary air blowing pipe 27 connected to an unillustrated air source via a venturi pipe 26. 5 is fixedly arranged in a posture along the upper surface of 5 and integrated with the empty ring cutting device 10. The distal end portion 27 a of the auxiliary air blowing pipe 27 is bent to the lower side portion of the suction pipe 5, and the distal end opening section 27 b faces upward immediately after the sewing progress direction X with respect to the distal end opening section 5 a of the suction pipe 5. Thus, as clearly shown in FIG. 7, the tip opening of the suction pipe 5 of the idle ring cutting device 10 is caused by the auxiliary air flow A <b> 3 blown upward from the tip opening portion 27 b of the auxiliary air blowing pipe 27. An air blowback air flow A1 ejected from the portion 5a in a direction Y opposite to the sewing progressing direction X substantially horizontally is positioned at the first position, and an upward suction air flow A2 is generated therein. The air ring suction nozzle 11 is configured to turn to the flow A4 toward the downward end opening 11a.

  Next, a description will be given of an idle stitching operation by the edge overlock sewing machine with the idle stitching device configured as described above with reference to the timing chart of FIG.

  When the sewing end of the preceding sewing fabric passes through the fabric sensor 18 and the sensor 18 is not detected (bright state), the suction pipe 5 of the idle ring cutting device 10 starts to suck and remains in the pipe. While the known thread loosening device is turned on to loosen the thread, the edge stitch sewing machine M continues to rotate until it reaches a preset number of stitches, during which time it connects to the stitch forming claw portion 1a of the needle plate 1. Thus, an empty ring 2 having a certain length is formed. When the set number of stitches is reached, the rotation of the sewing machine M stops, and the suction pipe 5 of the idle ring cutting device 10 sucks the idle ring 2 and cuts the idle ring from the preceding sewing fabric by the upper blade 6 and the lower blade 7. The cut air ring 2 is blown back in a straight line in a direction Y opposite to the sewing progress direction X by an air flow A1 which is ejected from the front end opening 5a of the suction pipe 5 in a direction substantially horizontal to the direction opposite to the suction direction. .

  Immediately thereafter, the idle suction nozzle 11 that has been waiting at the second position indicated by the solid line in FIGS. 2 and 7 is driven to swing to the first position indicated by the phantom line in FIGS. An upward suction air flow A2 is generated inside. At the same time or before and after, the auxiliary air flow A3 is blown upward from the tip opening 27b of the auxiliary air blowing pipe 27. As a result, the air ring blowback air flow A1 ejected substantially horizontally from the front end opening 5a of the suction pipe 5 in the direction Y opposite to the sewing progress direction X generates an upward suction air flow A2 inside. The empty ring 2 blown out from the intake pipe 5 of the empty ring cutting device 10 is changed in flow, A4, toward the downward end opening 11a of the empty ring suction nozzle 11 and changes in its properties, particularly in weight. Regardless, the suction nozzle 11 is reliably sucked and held through the downward opening 11a. That is, the idle ring transition from the idle ring cutting device 10 to the idle ring suction nozzle 11 is performed reliably and smoothly.

  The air ring suction nozzle 11 that sucks and holds the air ring 2 then swings again to the second position indicated by the solid line in FIGS. 2 and 7 and waits, and at the same time, the presser foot 16 is separated from the upper surface of the needle plate 1. To rise. In this state, the sewing of the preceding sewing fabric is completed by turning off the pedal.

  Next, in a state in which the air ring 2 sucked and held by the air ring suction nozzle 11 is drawn in front of the needle drop portion 1b of the needle plate 1 by the swing movement of the suction nozzle 11 to the second position, The next succeeding sewing fabric W is set on the throat plate 1 so that the sewing start edge is positioned substantially on the same line as the fabric edge cutting knife 15 in the sewing progress direction X, and the fabric sensor 18 detects it. In the dark state, the presser foot 16 is lowered so as to come into contact with the upper surface of the throat plate 1, and the thread loosening device is turned off to release the thread loosening, so that the sewing can be started.

  When the pedal is turned on in this state, the sewing machine M starts to rotate and the subsequent sewing fabric W is fed in the sewing progress direction X until the sewing start edge reaches the needle drop portion 1b of the needle plate 1. During this time, the empty ring 2 wound around the stitch forming claw portion 1a of the needle plate 1 remains wound around the claw portion 1a.

  Further, the subsequent sewing fabric W is fed in the sewing progress direction X, and the sewing start edge reaches the position near the tip of the stitch forming claw portion 1a of the needle plate 1, and the fabric edge is cut from the sewing start edge. When the dimension up to the upper knife 15 reaches a position where the predetermined length is reached, the rotation of the sewing machine M is once stopped for a predetermined time, and at the same time, the empty ring suction nozzle 11 is moved from the second position to the position shown in FIG. By swinging and moving to the third position, the air ring 2 is pulled to the front side of the needle drop portion 1b.

  Immediately after that, the empty ring pushing device 23 is actuated and the empty ring pushing tool 25 moves obliquely in the lower left direction. Along with this, a part of the empty ring 2 is brought into contact with the needle 25a through the hooking portion 25a. It will be pushed and displaced to the left of the falling part 1b, and thereafter the suction holding of the empty ring 2 by the empty ring suction nozzle 11 is released.

  Then, once the sewing machine M once stopped is returned to a predetermined rotation, the subsequent sewing fabric W is sent in the sewing progress direction X and sewing is started, and air blowing from the air nozzle 19 is performed by the initial needle movement at the start of sewing. The hollow ring 2 pushed into the cutting portion of the fabric edge cutting knife 15 by cutting is cut by the knife 15 and a fixed knife (not shown) together with the side edge portion of the sewing fabric, and the cut empty ring portion becomes the subsequent sewing fabric. It is drawn into the seam at the sewing start end and is sewn.

  Furthermore, when the number of hands at the time of sewing the ground ring after the above-mentioned empty ring stitching reaches a predetermined value, the empty ring pushing device 23 moves back to the diagonally upper right position shown by the solid line in FIG. And the empty ring suction nozzle 11 returns to the second position and is prepared for the next empty ring stitching.

  In the above embodiment, the auxiliary air blowing pipe 27 is fixedly disposed in a posture along the upper surface of the suction pipe 5 of the idle ring cutting device 10 and integrated with the idle ring cutting device 10. The auxiliary air blowing pipe 27 may be provided separately from the idle ring cutting device 10.

  Further, in the above embodiment, the two-edge edge sewing machine M is illustrated, but even when applied to an edge-sewing machine having a plurality of needles other than one needle, the same effects as described above can be obtained. It is what is done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall schematic perspective view of an edge stitch machine with an empty ring stitching device according to the present invention.   It is a perspective view which shows the structure of the principal part of an empty ring stitching apparatus same as the above.   It is an expansion perspective view of the principal part of FIG.   It is a partially broken side view which shows the structure of the empty ring cutting device in an empty ring stitching device same as the above.   It is a top view which shows the structure of the empty ring cutting device in an empty ring stitching device same as the above.   It is an expansion partially notched top view of the principal part which shows the structure and operation | movement of an empty ring suction nozzle in an empty ring stitching device same as the above.   It is an enlarged side view of the principal part explaining the empty ring transfer effect | action in an empty ring stitching apparatus same as the above.   It is a timing chart explaining the empty ring stitching operation by the same empty ring stitching device.   It is a perspective view which shows the structure of the principal part of the conventional empty ring stitching apparatus.   It is an enlarged side view of the principal part explaining the empty ring transfer action in the conventional empty ring stitching device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Needle plate 1a Claw part 1b for stitch formation 1 Needle drop part 2 Empty ring 5 Suction pipe 10 Empty ring cutting device 11 Empty ring suction nozzle 11a Downward end opening part 16 Presser foot 27 Auxiliary air blowing pipe (auxiliary air blowing pipe)
A1 Air ring blow-back air flow A2 Suction air flow A3 Auxiliary air flow M Edge overlock sewing machine W Subsequent sewing fabric X Sewing progress direction Y Reverse direction of sewing progress direction

Claims (2)

An empty ring cutting device that sucks an empty ring connected to the stitch forming claw portion of the needle plate at the end of sewing of the preceding sewing fabric, cuts it from the preceding sewing fabric, and blows off the cut empty ring in a direction opposite to the sewing progress direction. The advancing position, which is disposed above the presser foot and sucks and holds the empty ring blown back from the empty ring cutting device, and moves in the direction opposite to the sewing progress direction with the start of sewing of the subsequent sewing fabric, and is held by suction. An empty ring suction nozzle that can move between a retracted position that pulls the empty ring toward the front side of the needle drop portion and retracts it into the stitching at the sewing start end of the subsequent sewing fabric. In a sewing machine with an empty ring stitching device configured to shift an empty ring pulled toward the front side of the press portion to the lower surface side of the presser foot and pull it into a seam at a sewing start end of a subsequent sewing fabric. ,
When the air ring suction nozzle is positioned at the forward movement position, the air ring suction airflow that is blown out substantially horizontally from the air ring cutting device in a direction opposite to the sewing progress direction is directed to the downward end of the air ring suction nozzle. A sewing machine with an empty ring stitching device, characterized in that an auxiliary air blowing pipe is provided to blow an air flow upward so as to change the flow toward the opening.   The sewing machine with an empty ring stitching device according to claim 1, wherein the auxiliary air flow outlet pipe is integrally attached to the empty ring cutting device.

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