JP2010017529A - Sewing machine with tape feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine having a tape feeder capable of reducing the risk of causing fractures in a timing belt by preventing any fluffy dust generated by cutting off fabric edges from attaching to or accumulating on the timing belt or a tooth part of a driving roller shaft. <P>SOLUTION: This sewing machine having a tape feeder comprises: a bed; a cloth cutter located nearby capable of working in conjunction with the sewing machine; a driving roller, including a first toothed pulley, which holds a belt-like tape itself between and a driven roller; a second tooth pulley which is connected with the first toothed pulley via a timing belt; a motor which turns the second toothed pulley at a prescribed rotation speed as the sewing machine is driven; and a tape feeder which is disposed between the bed and the driving roller, including a movable knife for cutting the belt-like tape in cooperation with a fixed knife, and the sewing machine is provided with a blower outlet facing the inner circle of the timing belt and an air blower for blowing air through the blower outlet in conjunction with the movement of the movable knife. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sewing machine with a tape supply device that sews a tape such as rubber on a waist portion of a swimsuit or pants or a hem portion of a leg.

  As a conventional sewing machine with a tape supply device, one in which a belt-shaped tape supply driving roller arranged on the upper side of a needle plate (bed) is connected to a stepping motor via a timing belt is known. (For example, see Patent Document 1). In such a sewing machine with a tape supply device, a driving roller having a toothed pulley on a shaft piece sandwiches a belt-like tape with a driven roller. A tape cutter for cutting the strip tape is disposed between the needle plate and the drive roller, and a fabric trimming device for trimming the fabric edge on the side of the needle plate is provided. The tape cutter operates every time the tape sewing is completed, and the fabric trimming device is generally configured to trim the fabric edge in conjunction with the drive of the sewing machine.

JP 2002-172285 A (page 3-4, Fig. 1-2)

However, in a conventional sewing machine with a tape supply device, when cotton dust generated around the cloth trimming device of the sewing machine moves around the bed during driving, a part of the cotton dust is a timing belt or a toothed pulley (drive roller shaft piece). When the adhering cotton dust is interposed between both teeth, excessive tension is applied to the timing belt and the timing belt may break.
Accordingly, an object of the present invention is to prevent the dust generated by the cloth trimming device on the side of the throat plate from being fixed to the teeth of the timing belt or the driving roller shaft piece, and to reduce the breakage of the timing belt. An object of the present invention is to provide a sewing machine with a tape supply device.

  In order to achieve the above-mentioned object, the present invention has a bed and a sewing machine having a sewing machine interlocking type fabric trimming device beside the bed, a first toothed pulley, and a belt-like tape sandwiched by a driven roller. A drive roller, a second toothed pulley connected to the first toothed pulley by a timing belt, a motor for applying a predetermined amount of rotation to the second toothed pulley according to the drive of the sewing machine, and a bed A sewing machine with a tape supply device, which is arranged between a driving roller and a moving knife that cuts a belt-like tape in cooperation with a fixed knife, has a blower port directed into the ring of the timing belt, An air blower that blows air from the air blowing port in conjunction with the operation of the knife is provided.

  It is desirable to operate the moving knife through the air cylinder and connect a quick exhaust valve provided in the air piping of the air cylinder to the air blower. In addition, the air cylinder includes a rod that can be moved back and forth in the longitudinal direction, a packing that is fixed to the proximal end of the rod, and a stopper that locks the packing before reaching the output port. It is better to flow out only from the corresponding output port.

  According to the present invention, the air blower that has the air blowing port directed into the ring of the timing belt and that blows air in conjunction with the operation of the moving knife is provided. As a result, the timing belt is hardly broken due to an excessive increase in tension. In addition, if the moving knife is operated through the air cylinder and the quick exhaust valve provided in the air piping of the air cylinder is connected to the air blower, the required amount of air is instantaneously fed into the timing belt ring without spending a great deal of cost. Air can be blown, and air blown instantaneously does not return to the solenoid valve.

It is the perspective view which showed the external appearance of the sewing machine with a tape supply apparatus which concerns on this invention. It is the schematic front view explaining the principal part structure of the tape supply apparatus of the sewing machine. It is the principal part perspective view which showed the internal structure of the apparatus. It is the schematic side view explaining the ventilation location of the air blower of the apparatus. Schematic explanatory drawing which showed the other plan regarding the internal structure of the air cylinder of the apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the sewing machine 1 has a bed 2, and a part of the upper surface of the bed 2 is covered with a needle plate 3. A dough trimming device 4 is disposed on the side of the needle plate 3. The cloth trimming device 4 includes a fixed blade 4a fixed in the vicinity of the needle plate 3 and a moving blade 4b that moves up and down toward the fixed blade. The moving blade 4b moves up and down in conjunction with the sewing machine drive. The presser foot 5 disposed opposite to the throat plate 3 has an insertion port 5a for the belt-like tape T, and the fabric sandwiched between the throat plate 3 and the presser foot 5 is conveyed by a known feeding mechanism. The needle (not shown) arranged on the arm side of the sewing machine 1 intermittently penetrates the needle hole of the needle plate 3 when the sewing machine is driven, and at this time, the cloth on the needle plate 3 is sewn. .

  A tape supply device 6 is arranged above the bed 2 on the upper side. The tape supply device 6 includes a driving roller 7 and a driven roller 8 that sandwich the belt-like tape T. As shown in FIG. 2, the driving roller 7 has a shaft piece 7a, and a toothed pulley 9 is attached to the shaft piece 7a. Above the toothed pulley 9, a toothed pulley 11 fixed to the output shaft 10a of the stepping motor 10 is disposed. The ring-shaped timing belt 12 is mounted on the toothed pulleys 9 and 11, and the tooth portions 12 a formed inside the timing belt 12 and the tooth portions of the toothed pulleys 9 and 11 are in contact with each other. . The stepping motor 10 is attached to the bracket 13 on the front surface of the sewing machine, and the rotation amount of the output shaft 10a is determined according to the sewing machine driving speed. When the output shaft 10a of the motor 10 rotates in the direction of the arrow α in conjunction with the drive of the sewing machine, the rotation of the output shaft 10a is transmitted to the shaft piece 7a through the timing belt 12, and as a result, the drive roller 7 rotates. At this time, the belt-like tape T sandwiched between the driving roller 7 and the driven roller 8 is supplied to the presser foot 5 serving as a sewing portion. As shown in FIG. 3, the bracket 13 extends to both sides of the toothed pulley 9, and the shaft piece 7a is rotatably supported by the extending portions 13a and 13a.

  A tape cutter 14 is disposed between the bed 2 and the tape supply device 6 (drive roller 7). The tape cutter 14 includes a fixed knife 15 and a moving knife 16, and the fixed knife 15 is fixed to the lower surface of the protruding piece 13 b of the bracket 13. The moving knife 16 is rotatably fixed to the fixed knife 15 by a stepped screw 15 a, and the base of the moving knife 16 is connected to the rod 18 a of the air cylinder 18 via the link member 17. The rod 18a of the air cylinder 18 can advance and retreat in the longitudinal direction. The air cylinder 18 is a double-acting type and includes a first port 18b and a second port 18c. The first port 18b is connected to the output port 19s of the first quick exhaust valve 19A, and the second port 18c is connected to the output port 19x of the second quick exhaust bubble 19B. The input ports 19t and 19y of both quick exhaust bubbles 19A and 19B are connected to an electromagnetic valve 20, and the electromagnetic valve 20 is connected to an air supply source 21. The electromagnetic valve 20 has two valves 20a and 20b, and the opening and closing of the electromagnetic valve 20 is performed based on a knife operation signal generated at the end of tape sewing.

  An air blower 22 is attached to the tape supply device 6. The air blower 22 includes two blower pipes 23 and 24 extending in a direction away from the dough trimming device 4, and has blower openings 23 a and 24 a at the tips of the blower pipes 23 and 24, respectively. As shown in FIG. 4, the air blowing port 23 a is directed to the tooth portion 12 a of the timing belt 12 that is a meshing start portion with the toothed pulley 9, and the air blowing port 24 a is directed to the tooth portion 9 a of the toothed pulley 9. Yes. That is, the air outlets 23 a and 24 a of the air blowing pipes 23 and 24 are directed into the ring of the timing belt 12. The base end of the air duct 23 is connected to the exhaust port 19u of the first quick exhaust valve 19A, and the base end of the air duct 24 is connected to the exhaust port 19z of the second quick exhaust valve 19B.

  When one valve 20a of the electromagnetic valve 20 is opened by a signal generated at the end of tape sewing, air is supplied from the air supply source 21 to the input port 19t of the first quick exhaust bubble 19A. As a result, the input port 19t of the first quick exhaust bubble 19A is opened and the exhaust port 19u is closed. The air supplied to the input port 19t is supplied to the first port 18b of the air cylinder 18 through the output port 19s, and the rod 18a of the air cylinder 18 advances. As the rod 18a advances, the moving knife 16 turns to the fixed knife 15 side, and the belt-like tape T is cut. When the rod 18a advances, a part of the air supplied from the first port 18b is supplied to the output port 19x of the second quick exhaust valve 19B via the second port 18c. At this time, if the input port 19y of the second quick exhaust valve 19B is open, the port 10y is closed and the exhaust port 19z is opened. The air supplied to the output port 19x is supplied from the exhaust port 19z to the blower tube 24 of the air blower 22 and blown from the blower port 24a at the end of the blower tube 24. That is, the air supplied to the output port 19x of the second quick exhaust valve 19B is supplied to the blower tube 24 of the air blower 22 without being returned to the electromagnetic valve 20, and dust attached to the tooth portion 9a of the toothed pulley 9 is removed. Will be.

  Thereafter, when the one valve 20a is closed and the other valve 20b is opened, air is supplied from the air supply source 21 to the input port 19y of the second quick exhaust bubble 19B. Then, the input port 19y of the second quick exhaust bubble 19B is opened and the exhaust port 19z is closed. The air supplied to the input port 19y is supplied to the second port 18c of the air cylinder 18 through the output port 19x, and the rod 18a of the air cylinder 18 moves backward. As the rod 18a moves backward, the moving knife 16 rotates backward to secure a supply space for the strip-shaped tape T. When the rod 18a is retracted, a part of the air supplied from the second port 18c is supplied to the output port 19s of the first quick exhaust valve 19A via the first port 18b. At this time, the input port 19t of the first quick exhaust valve 19A is closed and the exhaust port 19u is opened. The air supplied to the output port 19 s is supplied from the exhaust port 19 u to the blower pipe 23 of the air blower 22 and blown from the blower opening 23 a at the end of the blower pipe 23. That is, the air supplied to the output port 19s of the first quick exhaust valve 19A is supplied to the blower pipe 23 of the air blower 22 without being returned to the electromagnetic valve 20, and the dust adhering to the tooth portion 12a of the timing belt 12 is toothed. It is removed before the tooth portion 9a of the pulley 9. As described above, when air is blown from the air blower 22 at the end of tape sewing to the tooth portion 9a of the toothed pulley 9, and then to the tooth portion 12a of the timing belt 12, the dust is toothed. Even if it is not removed on the pulley 9, the adhesion to the toothed pulley 9 is reduced, and the dust is reliably removed when air is blown in the vicinity of the tooth 12a of the timing belt 12. It becomes.

  In the present embodiment, the air cylinder 18 is a double-acting type, but it may be a single-acting type. In this case, the air blower 22 is connected to the toothed pulley 9 and the timing belt 12 with the tooth portion meshing start portion. It is desirable to turn to. In such a configuration, not only the basic effect of removing the dust adhering to the toothed pulley 9 or the tooth portion of the timing belt 12 can be achieved, but the number of parts is less than that of the double acting type. The cost effect of becoming can be expected. In this embodiment, air blowing from the air blower 22 at the end of tape sewing is first performed on the tooth portion 9a of the toothed pulley 9, and then performed on the tooth portion 12a of the timing belt 12. However, it is not limited to this. For example, air blowing from the air blower 22 may be performed first on the tooth portion 12 a of the timing belt 12 and then on the tooth portion 9 a of the toothed pulley 9. Even if it is set as such a structure, the cotton dust adhering to the tooth parts 9a and 12a of the toothed pulley 9 or the timing belt 12 will be removed.

  Even when the air outlet of the blower pipe is directed to the tooth portion of the timing belt 12 and the tooth portion of the toothed pulley 11 which are meshing start portions with the toothed pulley 11, the cotton adhering to the tooth portion on the toothed pulley 11 side. Although dust will be removed, if the sewing machine is not used as it is, cotton dust removed from the toothed pulley 11 may fall and adhere to the tooth portion 9a of the toothed pulley 9.

  Further, in the present embodiment, the air flowing into one port of the air cylinder 18 is configured to flow out to the other port, but the present invention is not limited to this. For example, as shown in FIG. 5, the packing 18aa fixed to the rod 18a is locked by the stoppers 18d and 18d before reaching the output ports 18b and 18c, and only the air staying in the chamber of the air cylinder 18 is received from the corresponding port. You may change a structure so that it may flow out. The stoppers 18d and 18d are preferably fixed to the inner wall of the air cylinder 18. With such a configuration, when the rod 18a advances, the air staying at the indoor front end side of the air cylinder 18 is supplied from the second port 18c to the output port 19x of the second quick exhaust valve 19B. Conversely, when the rod 18a is retracted, the air staying at the indoor base end side of the air cylinder 18 is supplied from the first port 18b to the output port 19s of the first quick exhaust valve 19A. The air supplied to the output ports 19x and 19s is supplied to the blower tube of the air blower 22 as in the embodiment described above.

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Bed 4 Material trimming device 7 Drive roller 7a Shaft piece 8 Driven roller 9 Toothed pulley 10 Motor 12 Timing belt 15 Fixed knife 16 Moving knife 22 Air blower 23a, 24a Blower T

Claims (3)

A sewing machine equipped with a bed and a sewing machine-linked dough trimming device beside the bed;
A driving roller having a first toothed pulley and sandwiching the belt-like tape with a driven roller;
A motor having a second toothed pulley connected to the first toothed pulley by a timing belt, and applying a predetermined amount of rotation to the second toothed pulley according to the drive of the sewing machine;
In the sewing machine with a tape supply device, which is disposed between the bed and the driving roller and includes a moving knife that cuts the belt-shaped tape in cooperation with a fixed knife.
A sewing machine with a tape supply device, comprising an air blower having an air blowing port directed into a ring of a timing belt and blowing air from the air blowing port in conjunction with an operation of a moving knife.   The sewing machine with a tape supply device according to claim 1, wherein the moving knife is operated through an air cylinder, and a quick exhaust valve provided in an air pipe of the air cylinder is connected to an air blower. The air cylinder includes a rod that can be moved back and forth in the longitudinal direction, a packing that is fixed to the proximal end of the rod, and a stopper that locks the packing before reaching the output port. The sewing machine with a tape supply device according to claim 2, wherein the sewing machine is caused to flow out from a corresponding output port.

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