JP2009291406A - Multi-headed sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-headed sewing machine which switches on/off actuators installed on several sewing machines by fluid pressure actuators that eliminates the use of a valve for locking/releasing the output shaft of the actuator by a mechanical means and controls the actuator. <P>SOLUTION: Several embroidery sewing machines are provided with top thread feeding devices 31 and air cylinders 62 which switch the on/off of such top thread feeding devices. Solenoids 63 are applied to the air cylinders 62 and stoppers 78 are provided to plungers 77 of the solenoids 63. The output shafts 73 of air cylinders 62 are connected to the top thread feeding devices 31 by couplings 70. The couplings 70 are provided with locking grooves 71 where the stoppers 78 are locked to guide the couplings 70 to move straight by guiding members 69. Solenoids 63 are de-energized, the output shafts 73 are locked by the stoppers 78 while the air cylinders 62 are in the energized state, and the movement of the top thread feeding devices 31 are stopped at a part of the embroidery sewing machines. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a multi-head sewing machine in which an operation device is installed in a plurality of sewing machines and the operation / stop of the operation device is switched by a fluid pressure actuator.

2. Description of the Related Art Conventionally, a multi-head sewing machine is known in which a plurality of sewing machines are provided with a device for sending embroidery materials such as embroidery threads and decorative parts to a sewing position. For example, Patent Document 1 describes a large embroidery sewing machine that combines a drive shaft common to several hundred embroidery points (sewing positions) and a thread brake for each embroidery point. In this embroidery sewing machine, a large number of brake rollers for braking the embroidery thread are switched between a position where the brake roller engages with the drive shaft and a position where the brake roller detaches. Each air cylinder is connected to a switching valve via an air pipe, and many valves are connected to an air supply source common to all embroidery points.
JP 7-26464 A

  However, according to the conventional multi-head type sewing machine, since the operation / stop of the operating device is switched by controlling the pressure of the fluid pressure actuator, it is necessary to provide an expensive fluid switching valve for each of the many sewing machines. In addition, since the number of pipe connection points is increased, dropout and leakage are likely to occur, and the operation reliability of the operating device is lowered.

  An object of the present invention is to provide a multi-head sewing machine that solves the above-described problems and that can control the fluid pressure actuator with inexpensive mechanical means and increase the operation reliability of the actuator.

  In order to solve the above-mentioned problems, the present invention provides a multi-head type sewing machine in which an operation device is installed in a plurality of sewing machines and the operation / stop of the operation device is switched by a fluid pressure actuator. A stopper is provided on the actuator, and the output shaft is locked by the stopper in the biased state of the fluid pressure actuator, and the operation of the actuator is stopped by a part of the sewing machine.

  In addition, the multi-head sewing machine of the present invention couples the output shaft of the fluid pressure actuator to the actuator with a coupling so as to protect the fluid pressure actuator from an impact generated when the actuator is switched, and stops the coupling on the coupling. And a coupling is guided in the axial direction of the output shaft by a guide member.

  Examples of the sewing machine operating device include an upper thread feeding device, a yarn tension adjusting device, a decorative part feeding device such as sequin and rhinestone, a material feeding device such as a patch and a label, and a lubricating oil supply device. Examples of the fluid pressure actuator include an air cylinder, a hydraulic cylinder, a pneumatic pump, a hydraulic pump, and the like. In addition to an actuator in which the output shaft moves linearly, an actuator that rotates can also be used. As the electric actuator, a solenoid, a motor, a piezoelectric actuator, or the like can be used.

  According to the multi-head type sewing machine of the present invention, the output shaft of the actuator is mechanically locked by the stopper while the fluid pressure actuator is energized. With such a configuration, there is an effect that the operation reliability of the actuator can be improved.

  In the multi-head sewing machine (100), the operation device (31) is installed in a plurality of sewing machines (1), and the operation / stop of the operation device (31) is switched by the fluid pressure actuator (62). 62) is combined with the electric actuator (63), the electric actuator (63) is provided with a stopper (78), and the output shaft (73) of the fluid pressure actuator (62) is coupled to the actuator (31) by the coupling (70). The coupling (70) is provided with a locking portion (71) for locking the stopper (78), and the coupling (70) is guided in the axial direction of the output shaft (73) by the guide member (69). The output shaft (73) is locked by the stopper (78) in the biased state of the fluid pressure actuator (62), and the operation of the actuator (31) is stopped by a part of the sewing machine (1). To.

  Embodiment 1 of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the multi-head embroidery sewing machine 100 of this embodiment is configured by arranging a plurality of (for example, 56) multi-needle embroidery sewing machines 1 in the left-right direction of the machine frame 2. The sewing machine frame 2 includes a column portion 3 and a beam portion 4, and an arm 5 of a multi-needle embroidery sewing machine 1 projects from the front surface of the beam portion 4. A sewing head 6 is supported on the front surface of the sewing machine arm 5 by a rail 7 so as to be slidable in the left-right direction, and the heads 6 of all embroidery sewing machines 1 are simultaneously driven by a motor 9 of a color changing mechanism 8 via a connecting rod 10. .

  A plurality of (for example, five) needle bars 11, a thread guide 12, a balance 13, and a thread clamp 14 are disposed on the sewing head 6, and a needle 15 is attached to the lower end of each needle bar 11. A table 16 is provided below the sewing head 6, and an embroidery frame 17 that holds the work cloth W is placed on the table 16 so as to be movable in the XY direction. A sewing machine bed 18 having the same height as the table 16 is provided with a needle plate 19 and a rotary hook 20, and one of a plurality of needles 15 cooperates with the rotary hook 20 by sliding of the sewing machine head 6. Selectively placed in position.

  2 and 3, a tension base 22 is installed at the upper end of the sewing head 6, and a plurality of thread tensions 21 and a switch 27 for individually stopping the operation of the embroidery sewing machine 1 are arranged on the front surface thereof. Has been. A thread stand 23 and an upper thread feeder 31 are installed in the beam section 4 above the tension base 22. A large number of bobbins 24 as upper thread supply sources are placed on the thread stand 23, and the upper thread T unwound from the bobbin 24 is supplied to the upper thread feeder 31 through the thread hook 25 and the tensioner 26. Then, the upper thread feeder 31 sends one embroidery thread ET out of the same number of upper threads T as the needle 15 to the needle 15 at the sewing position via the thread tension 21, the balance 13, and the like.

  The upper thread feeder 31 includes an upper thread guide mechanism 32, a drive roller 33, a presser roller 34, and a switching mechanism 35 on the yarn path between the thread stand 23 and the tension base 22. The upper thread guide mechanism 32 is attached to the top of the tension base 22 and guides a plurality of upper threads T up and down in a state of being aligned left and right. The drive roller 33 is disposed on the rear side of the upper thread guide mechanism 32 and extends long to the left and right so as to cross each upper thread T. The presser roller 34 faces the drive roller 33 from the front, and presses one embroidery thread ET against the drive roller 33.

  The switching mechanism 35 is disposed above the presser roller 34 and drives the presser roller 34 to a position where the presser roller 34 is engaged with the drive roller 33 and a position where it is released. The drive roller 33, the presser roller 34, and the switching mechanism 35 are provided on the beam unit 4 and operate at fixed positions in the left-right direction of the sewing machine frame 2. The upper thread guide mechanism 32 includes a base 37 attached to the tension base 22, and the base 37 and the color changing mechanism 8 constitute a yarn distribution mechanism 36. Then, the yarn distribution mechanism 36 moves integrally with the sewing head 6 so that the upper thread guide mechanism 32 slides left and right with respect to the presser roller 34 so that the embroidery thread ET is interposed between the drive roller 33 and the presser roller 34. It has become.

  As shown in FIGS. 4, 5, and 6, a pair of left and right support bars 38 are erected on the upper surface of the base 37, and an arm 39 is attached to the upper end of each support bar 38. The arm 39 projects to the upper side of the drive roller 33, and an upper thread introduction plate 40 and a first thread guide 41 are attached to the upper and lower portions of the projecting portion. A flexible member 42 such as a felt is bonded to the lower surface of the upper thread introduction plate 40, and the same number of threading holes 43 as the upper thread T are formed in the first thread guide 41. The upper thread introduction plate 40 is provided so as to be rotatable and detachable with respect to the arm 39 by notches 44 and screws 45 at both ends.

  The flexible member 42 is joined to the upper surface of the first thread guide 41 on the upstream side of the drive roller 33 and applies tension to the upper thread T passing through the threading hole 43. For this reason, the upper thread T can be linearly extended below the threading hole 43 and the single embroidery thread ET can be accurately grasped by the presser roller 34. A second thread guide 46 is attached to the upper end of the base 37 below the first thread guide 41. The first yarn guide 41 and the second yarn guide 46 are opposed to each other in the vertical direction at the same or narrow interval as the diameter of the driving roller 33, suppresses the yarn shaking accompanying the movement of the base 37, and stabilizes the arrangement of the upper yarns T.

  The threading hole 47 of the second thread guide 46 is formed in front of the threading hole 43 of the first thread guide 41, and the upper and lower threading holes 43, 47 float the upper thread T from the drive roller 33 and guide it. . For this reason, the rotational force of the drive roller 33 is not transmitted to the upper threads T other than the embroidery thread ET, so that each upper thread T can be held in a stationary state, and electrostatic charging due to friction can be prevented. Below the second thread guide 46, a third thread guide 48 is mounted at the intermediate height of the base 37, and the upper thread T is distributed from the threading hole 49 of the thread guide 47 to the tension base 22 side.

  A scraper 50 is mounted on the front surface of the base 37 on the rear side of the second yarn guide 46 and the third yarn guide 48. The scraper 50 is formed of a thin plate material, and the bent portion 51 at the upper end is in light contact with the surface of the driving roller 33 below the engaging portion (see FIG. 7) between the driving roller 33 and the pressing roller 34. Then, the scraper 50 peels the embroidery thread ET from the surface of the driving roller 33 by the bent portion 51, prevents the embroidery thread ET from being caught by the driving roller 33, and smoothly guides the embroidery thread ET to the threading hole 47 of the second thread guide 46. It can be done.

  As shown in FIGS. 1 and 2, the driving roller 33 is made of a long metal pipe, extends so as to hang over several or all of the multi-needle embroidery sewing machines 1, and is supported by the beam unit 4 by a plurality of bearings 53. Yes. A motor 54 is installed at one end of the beam unit 4, and an output unit 55 is connected to one end of the drive roller 33 via a belt 56 and a transmission pulley 57. The motor 54 is controlled by a controller (not shown) common to all the embroidery sewing machines 1, and the drive roller 33 is driven at a rotational speed based on the upper thread feed data in the embroidery program.

  In this embodiment, a metal pipe having a diameter of 25 mm is used for the drive roller 33, and the surface of the pipe is used as it is as an upper thread gripping surface. For this reason, the space | interval of the 1st and 2nd thread | yarn guides 41 and 46 can be narrowed to about 20 mm, and the upper thread | yarn T can be guided in a stable state. Further, it is not necessary to provide a separate roller on the metal pipe, and a plurality of upper threads T can be selectively fed by sharing one drive roller 33, and the number of parts of the upper thread feeder 31 can be reduced. There is also an advantage that the static electricity generated in the upper thread T can be released by a metal pipe and the embroidery thread ET can be prevented from adhering.

  As shown in FIGS. 1 and 4, a long mounting shaft 58 is disposed on the upper side of the driving roller 33 and is assembled to the beam portion 4 by a bracket 59. At a position corresponding to each multi-needle embroidery sewing machine 1, a substrate 60 and a lever 61 of the switching mechanism 35 are mounted on the mounting shaft 58, and an air cylinder 62 that switches operation / stop of the upper thread feeder 31 on the substrate 60. And a solenoid 63 that locks the air cylinder in an energized state. Each air cylinder 62 is connected to an air supply source (not shown) common to all the embroidery sewing machines 1 by an air pipe 64, and all the air cylinders 62 are energized by pressurized air during operation of the multi-head embroidery sewing machine 100. ing.

  As shown in FIGS. 6 and 7, the lever 61 is formed in a bifurcated shape, and an intermediate portion is rotatably supported on the attachment shaft 58. The front end input portion 65 of the lever 61 is connected to the output block 67 of the air cylinder 62 by a pin 66, and the presser roller 34 is supported by a roller shaft 68 at the lower end of the lever 61. The presser roller 34 is formed to have a size so that only one embroidery thread ET is gripped by a flexible material such as rubber. The presser roller 34 is pressed against the drive roller 33 when the lever 61 rotates downward, and the lever 61 rotates upward. When it moves, it is detached from the drive roller 33.

  The air cylinder 62 is attached to the upper end of the guide member 69, and the guide member 69 is fixedly installed on the substrate 60. The guide member 69 is formed in a cylindrical shape having a guide hole 69a coaxial with the output shaft 73 of the air cylinder 62, and a coupling 70 having a larger diameter than the output shaft 73 is slidably inserted into the guide hole 69a. . The coupling 70 includes a locking groove 71 at an intermediate portion, an output shaft 73 is coupled to a portion 72 above the locking groove 71, and a screw 75 is protruded from a lower portion 74. A screw 75 is connected to the input portion 65 of the lever 61 via the output block 67.

  The solenoid 63 is installed on the substrate 60 in the vicinity of the guide member 69, and the plunger 77 of the solenoid 63 is provided at a right angle to the output shaft 73. A pin-shaped stopper 78 is coaxially attached to the plunger 77, and a spring 79 that biases the stopper 78 toward the guide member 69 is interposed between the base end surface of the stopper 78 and the solenoid 63. Then, the tip of the stopper 78 is locked in the locking groove 71 of the coupling 70 through the lateral hole 76 of the guide member 69 in the demagnetized state of the solenoid 63, and is released from the locking groove 71 in the excited state of the solenoid 63. It is like that.

  As shown in FIG. 6, the multi-needle embroidery sewing machine 1 configured as described above changes the color of the upper thread T in a state where the presser roller 34 is detached from the drive roller 33. At this time, in the needle thread feeding device 31, the output shaft 73 of the air cylinder 62 stops at the upper limit position, the solenoid 63 is demagnetized, and the stopper 78 locks the coupling 70. In this state, the color changing mechanism 8 slides the sewing head 6 and arranges one needle 15 at the sewing position. Then, as shown in FIGS. 3A and 3B, the yarn distribution mechanism 36 slides to the left and right integrally with the tension base 22, and the upper thread guide mechanism 32 is moved with respect to the presser roller 34, so that one The embroidery thread ET is interposed between the drive roller 33 and the presser roller 34.

  When the color change is completed, as shown in FIG. 7, the solenoid 63 is excited to attract the plunger 77, and the stopper 78 is separated from the coupling 70 to release the output shaft 73 of the air cylinder 62. As a result, the output shaft 73 protrudes from the upper limit position to the lower limit position, the lever 61 rotates downward, and the presser roller 34 presses the embroidery thread ET against the drive roller 33. Then, the needle 15 is moved up and down by each embroidery sewing machine 1, the driving roller 33 is rotated at a pre-programmed speed, the specified amount of the embroidery thread ET is pulled out from the bobbin 24, and the flexible member 42 of the upper thread guide mechanism 32, It is fed out toward the needle 15 at the sewing position through the thread guides 41, 46 and 48.

  According to the needle thread feeding device 31 of this embodiment, since a common drive roller 33 is used for a plurality of multi-needle embroidery sewing machines 1, there is one press roller 34 for each roller 33 and embroidery sewing machine 1. In the meantime, the embroidery thread ET can be gripped and sent out in a stretched state. For this reason, the number of parts of the upper thread feeding device 31 can be reduced, the trouble of winding the upper thread T can be omitted, and the winding habit of the embroidery thread ET can be eliminated. In particular, since the upper thread guide mechanism 32 is moved using the power of the color changing mechanism 8, the dedicated drive means can be omitted from the yarn distribution mechanism 36, and the embroidery thread ET can be distributed with an inexpensive configuration.

  When the embroidery process is completed, the air cylinder 62 pulls the presser roller 34 away from the drive roller 33, the solenoid 63 is demagnetized, and the stopper 78 locks the coupling 70 (see FIG. 6). In order to suspend some embroidery sewing machines 1, the switch 27 of the tension base 22 is turned off. In this state, when the multi-head embroidery sewing machine 100 is restarted, the air cylinders 62 are energized in all the embroidery sewing machines 1, but as shown in FIG. Therefore, the stopper 78 is not released from the coupling 70, and the output shaft 73 is locked at a position slightly lowered from the upper limit position. For this reason, the presser roller 34 is held at a position where it is separated from the driving roller 33, the upper thread feeding device 31 is stopped, and the feeding operation of the embroidery thread ET is cancelled.

  According to the multi-head embroidery sewing machine 100 of this embodiment, the stopper 78 is driven by the solenoid 63, and the output shaft 73 of the air cylinder 62 is mechanically locked by the stopper 78. There is no need to provide a valve. For this reason, the air supply system can be configured easily and inexpensively, and the air pipe 64 is less likely to drop off or leak, and the operation reliability of the upper thread feeder 31 can be improved. Further, since the stopper 78 is locked to the coupling 70 and the coupling 70 is linearly guided by the guide member 69, the output shaft 73 is protected from the impact caused by the stopper 78 and the impact caused by the contact between the driving roller 33 and the pressing roller 34. In addition, the durability of the air cylinder 62 can be enhanced.

  Next, a second embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 9 and 10, the upper thread feeder 81 of the second embodiment has an upper thread guide mechanism 82 and a driving roller 83 installed on the beam section 4 of the sewing machine frame 2, and the presser roller 84 is installed in the beam section. The yarn distribution mechanism 86 is configured to move the presser roller 84 and the switching mechanism 35 in the axial direction of the drive roller 83 with respect to the upper thread guide mechanism 82. Hereinafter, a configuration different from the first embodiment will be described. In the drawings, the same reference numerals as those in the first embodiment denote the components described above.

  As shown in FIGS. 10 and 11, the upper thread guide mechanism 82 includes two thread guides 87 and 88 that face each other up and down at substantially the same interval as the diameter of the drive roller 83, and the upper thread T is aligned with each other. A plurality of threading holes 89 and 90 for guiding are formed. The yarn guides 87 and 88 are mounted on the upper and lower two-stage plate 91, and the plate 91 is mounted on the beam portion 4 via the mounting member 98. The drive roller 83 is formed in a columnar shape having a relatively large diameter and a length that crosses the plurality of upper threads T, and is fixedly provided on the left and right rotating shafts 92 at positions corresponding to the multi-needle embroidery sewing machines 1. It has been. The rotating shaft 92 is installed on the beam portion 4 by a bearing 53 and is driven by a motor 54 via a belt 56 (see FIG. 9).

  The presser roller 84 is supported by a lever 61, and the lever 61 is rotatably supported on a long slide shaft 93. The slide shaft 93 is supported by a rail 95 on the mounting member 98 via a bearing plate 94 and is driven along an axis parallel to the rotation shaft 92 by a motor 96 of the yarn distribution mechanism 86. At a position corresponding to the lever 61, the movable substrate 97 is attached to the slide shaft 93, and the switching mechanism 35 having the same configuration as that of the first embodiment is installed on the movable substrate 97. The yarn distribution mechanism 86 slides the switching mechanism 35 together with the presser roller 84 so that one embroidery thread ET is interposed between the presser roller 84 and the drive roller 83.

  Therefore, according to the upper thread feeder 81 of the second embodiment, since the drive roller 83 is formed with a length that crosses the plurality of upper threads T, one of the upper threads T as in the first embodiment. The embroidery thread ET can be gripped by the two rollers 83 and 84 and sent out while being stretched. Further, since the upper thread guide mechanism 82 guides the upper thread T at a fixed position on the sewing machine frame 2, it is possible to prevent thread sway during color change and to stabilize the thread gripping operation by the presser roller 84. Note that the operation and effect of canceling the needle thread feeding operation by some embroidery sewing machines 1 are the same as those of the multi-head embroidery sewing machine 100 of the first embodiment.

The present invention is not limited to the above-described embodiments. For example, as described below, the present invention can be appropriately modified and embodied without departing from the spirit of the invention.
(1) In a multi-needle embroidery sewing machine not equipped with the tension base 22, the base 37 of the upper thread guide mechanism 32 is attached to the sewing machine head 6.
(2) The third thread guide 48 is omitted in the upper thread guide mechanism 32 shown in FIG.
(3) In the switching mechanism 35 shown in FIGS. 6 and 10, the stopper 78 is driven by an electric motor.
(4) In the upper thread feeder 81 shown in FIG. 10, the scraper 50 shown in FIG.

1 is a front view of a multi-head embroidery sewing machine showing Embodiment 1 of the present invention. It is a side view which shows one multi-needle embroidery sewing machine. It is a front view showing an upper thread feeder of a multi-needle embroidery sewing machine. It is a perspective view which shows the drive roller and presser roller of an upper thread feeder. It is a disassembled perspective view which shows the upper thread guide mechanism of the upper thread feeder. It is sectional drawing which shows the switching mechanism of an upper thread feeder. FIG. 6 is a cross-sectional view showing an upper thread gripping operation by a presser roller. It is sectional drawing which shows cancellation operation | movement of a switching mechanism. It is a front view of the multi-head type embroidery sewing machine which shows Example 2 of the present invention. It is sectional drawing which shows the upper thread feeder of a multi-needle embroidery sewing machine. It is a front view which shows operation | movement of an upper thread feeder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multi-needle embroidery machine 2 Sewing machine frame 6 Sewing machine head 8 Color change mechanism 15 Needle 31 Needle thread feeder (Example 1)
32 Upper thread guide mechanism 33 Drive roller 34 Presser roller 35 Switching mechanism 36 Distribution mechanism 41 First thread guide 42 Flexible member 46 Second thread guide 50 Scraper 62 Air cylinder 63 Solenoid 69 Guide member 70 Coupling 71 Locking groove 73 Output Shaft 78 Stopper 81 Upper thread feeder (Example 2)
82 Upper thread guide mechanism 83 Drive roller 84 Presser roller 86 Thread distribution mechanism 87 Thread guide 88 Thread guide 100 Multi-head embroidery sewing machine

Claims (2)

In a multi-head sewing machine in which actuators are installed in a plurality of sewing machines and the operation / stop of the actuators is switched by a fluid pressure actuator.
An electric actuator is combined with each fluid pressure actuator, a stopper is provided on the electric actuator, the output shaft is locked by the stopper in the biased state of the fluid pressure actuator, and the operation of the actuator is stopped by a part of the sewing machine. Features a multi-head sewing machine.   The multi-head type sewing machine according to claim 1, wherein the output shaft is coupled to the actuator by a coupling, a locking portion for locking the stopper to the coupling is provided, and the coupling is guided in the axial direction of the output shaft by the guide member. .

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