JP2005074113A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine for preventing a threader hook from colliding with a sewing needle from to be broken by saving the threading hook from the needle eye of the sewing needle when the threader hook has probability to collide with the sewing needle. <P>SOLUTION: The sewing machine includes a threader hook detecting means 111 for detecting the position of the threader hook; a state detecting means 112 for detecting a prescribed state relative to the operation of the sewing machine; and a movement control means 100 for driving threader hook moving means 70, 109, so as to save the threader hook to a saving position separated from the needle eye of the sewing needle, based on the position of the threader hook detected by the threader hook detecting means 111 and the prescribed state of the sewing machine detected by the state detecting means 112. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sewing machine that includes a threading hook that can move forward and backward with respect to the eye hole of a sewing needle, and a threading hook moving means that moves the threading hook, and that automatically threads the eye through the eye hole.

  2. Description of the Related Art Conventionally, there has been known a sewing machine provided with a threading device that can automatically thread a thread through a threaded hook by advancing and retracting a threading hook through the threaded hole of a sewing needle (for example, see Patent Document 1). ).

  This patent document 1 includes needle bar raising means for raising a needle bar in response to an operation of the threading device and positioning the needle bar at a predetermined position. A sewing machine is disclosed in which the needle raising means is driven to position the needle bar at a predetermined position, and then a threading pulse motor for moving the threading hook is driven to advance and retract the threading hook with respect to the eye hole.

According to the sewing machine described in Patent Document 1, when the threading hook is advanced and retracted with respect to the eye hole, the needle bar (the eye of the sewing needle attached to the needle bar) is positioned at a predetermined position. Therefore, the threading hook can be properly advanced and retracted into the eye of the sewing needle.
Japanese Patent No. 2917324

  However, a general sewing machine is provided with a manual operation member such as a hand pulley for manually rotating the main shaft of the sewing machine in order for the operator to manually move the needle bar up and down. In the threading device of 1, when the operator inadvertently operates the manual operation member while the threading hook is inserted into the eye hole, the threading hook collides with the sewing needle. There is a risk of damage.

  It is also conceivable to provide mechanisms for coping with this, but these mechanisms complicate the mechanism around the main shaft of the sewing machine. As the state where the threading hook collides with the sewing needle, it may be caused by a cause other than the above-mentioned manual operation member, and for all of them, a mechanism for prohibition or invalidation as described above is provided. Was not realistic.

  The object of the present invention is to retract the sewing needle from the eye hole when the threading hook has a possibility of colliding with the sewing needle, and the threading hook collides with the sewing needle and is damaged. It is to provide a sewing machine that can prevent this.

  The invention of claim 1 has a threading hook that can be advanced and retracted with respect to the stitch hole of the sewing needle, and a threading hook moving means for moving the threading hook, and the threading hook is moved by the moving means. In a sewing machine equipped with a threading device for threading through the eye of the sewing needle by inserting and retracting into the hole, threading hook detecting means for detecting the position of the threading hook, and a predetermined state relating to the operation of the sewing machine Based on the state detecting means for detecting the thread, the position of the threading hook detected by the threading hook detecting means, and the predetermined state of the sewing machine detected by the state detecting means, the threading hook moving means is driven to thread And a movement control means for retracting the threading hook to a retracted position separated from the eye of the sewing needle.

  According to this sewing machine, the threading hook detecting means detects the position of the threading hook, and the state detecting means detects a predetermined state related to the operation of the sewing machine. Based on the detected position of the threading hook and the predetermined state of the sewing machine, the movement control means drives the threading hook moving means to retract the threading hook to a retracted position separated from the eye of the sewing needle.

  According to a second aspect of the present invention, in the sewing machine according to the first aspect, the threading hook detection means includes an insertion position detection sensor for detecting that the threading hook is positioned at the insertion position inserted into the eye of the sewing needle. And the movement control means is configured to detect the threading thread when the state detecting means detects the predetermined state of the sewing machine in a state where the insertion position detecting sensor detects that the threading hook is located at the insertion position. The hook is retracted from the insertion position to the retracted position.

  According to this sewing machine, the insertion position detection sensor detects that the threading hook is located at the insertion position inserted into the eye hole, and the movement control means detects the sewing machine in a state where the threading hook is located at the insertion position. When a predetermined state is detected, the threading hook is retracted to the retracted position.

  According to a third aspect of the present invention, in the sewing machine according to the first aspect, the threading hook detecting means detects whether or not the threading hook is positioned at a predetermined retracted position spaced from the eye of the sewing needle. The movement control means includes a detection sensor, and the movement control means detects a predetermined state of the sewing machine by the state detection means in a state in which it is detected by the retract position detection sensor that the threading hook is not located at the predetermined retract position. The threading hook is retracted to a predetermined retracting position.

  According to this sewing machine, the retracting position detecting means detects whether or not the threading hook is located at the predetermined retracting position, and the movement control means is in a state where the threading hook is not located at the predetermined retracting position. When a predetermined state of the sewing machine is detected, the threading hook is retracted to the retracted position.

  According to a fourth aspect of the present invention, in the sewing machine according to any one of the first to third aspects, the state detecting means is operated to rotate the main spindle for moving the needle bar holding the sewing needle up and down. And at least one state in which the needle bar has been moved in the left-right direction and that the power supply to the sewing machine has been shut off, and the movement control means detects the threading hook when at least one state is detected. Based on the position of the threading hook detected by the detecting means, the threading hook is retracted to the retracted position.

  According to this sewing machine, the state detection means includes at least one of an operation for rotating the main shaft of the sewing machine, a movement of the needle bar in the left-right direction, and a power-off of the sewing machine being cut off. The state is detected, and the movement control means retracts the threading hook to the retracted position based on the position of the threading hook when at least one of these states is detected.

  According to a fifth aspect of the present invention, in the sewing machine according to any one of the first to third aspects, the plurality of needle bars, the needle bar support means for supporting the plurality of needle bars, and the needle bar support means in the left-right direction. Needle bar moving means for moving the needle bar support means, and the needle bar support means is moved in the left-right direction by the needle bar moving means, so that one of the needle bars supported by the needle bar support means is threaded. By selectively facing the hook, it can be threaded through the eye of the sewing needle attached to the needle bar, and the state detection means detects that the needle bar support means has been moved in the left-right direction. The movement control means is characterized in that when the movement of the needle bar support means is detected, the threading hook is retracted to the retracted position based on the position of the threading hook detected by the threading hook detecting means. Have.

  According to this sewing machine, the state detection means detects that the needle bar support means for supporting the plurality of needle bars has moved in the left-right direction, and the movement control means detects the thread when the needle bar support means is moved. Based on the position of the threading hook, the threading hook is moved to the retracted position.

  According to a sixth aspect of the present invention, in the sewing machine according to any one of the first to fifth aspects, the threading hook moving means transmits the pulse motor and the driving force of the pulse motor to the threading hook so that the threading hook is moved. And a driving force transmission means for moving.

  According to this sewing machine, the threading hook is moved by transmitting the driving force of the pulse motor to the threading hook.

  According to the first aspect of the present invention, based on the position of the threading hook detected by the threading hook detecting means and the predetermined state of the sewing machine detected by the state detecting means, the movement control means controls the threading hook moving means. The driven and threading hook is retracted to the retracted position separated from the stitch hole of the sewing needle, so that when a predetermined state such as the main shaft of the sewing machine rotating or moving the needle bar case occurs automatically Thus, the threading hook can be retracted from the eye of the sewing needle, and the threading hook can be prevented from being damaged by colliding with the sewing needle.

  According to the invention of claim 2, the threading hook is retracted from the insertion position when a predetermined state of the sewing machine is detected when the insertion position detection sensor detects that the threading hook is located at the insertion position. Since it is retracted to the position, the threading hook can be prevented from being damaged.

  According to a third aspect of the present invention, the threading hook is detected when a predetermined state of the sewing machine is detected by the state detecting means in a state where the retracting position detecting sensor detects that the threading hook is not positioned at the predetermined retracted position. Since the hook is retracted to a predetermined retracted position, the threading hook can be prevented from being damaged.

  In the invention of claim 4, the state detecting means has been operated to rotate the sewing machine main shaft for moving the needle bar holding the sewing needle up and down, the needle bar has been moved in the left-right direction, Since the threading hook is retracted to the retracted position based on the position of the threading hook detected by the threading hook detection means when at least one state that the power supply of the sewing machine is cut off is detected, the state The case where there is a risk of the threading hook being broken by the detection means can be accurately determined, and the threading hook can be quickly retracted.

  According to the fifth aspect of the present invention, the threading hook detected by the threading hook detecting means when the state detecting means detects that the needle bar supporting means supporting the plurality of needle bars has moved in the left-right direction. Since the threading hook is retracted to the retracted position based on the position of the threading needle, the threading hook is broken even when the threading device is used in a multi-needle sewing machine equipped with a needle bar support means for supporting a plurality of needle bars. Can be prevented in advance.

  According to the sixth aspect of the present invention, the threading hook moving means includes a pulse motor and driving force transmitting means for transmitting the driving force of the pulse motor to the threading hook to move the threading hook. By making the hook moving means simple, the manufacturing cost of the sewing machine can be reduced.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment is an example in which the present invention is applied to an industrial or professional multi-head sewing machine that includes three multi-needle embroidery sewing machines and can simultaneously sew three identical embroidery patterns to a hat.

  First, the multi-head sewing machine M will be described. Note that the direction in which the worker is located is assumed to be the front, and left, right, up and down are determined as viewed from the worker. As shown in FIG. 1, the multi-head sewing machine M has an embroidery machine body frame 1 extending in the left-right direction, and a sewing machine support plate 2 extending in the left-right direction disposed on the rear side of the upper surface of the embroidery machine body frame 1. On the sewing machine support plate 2, three multi-needle embroidery sewing machines M1 to M3 having the same structure are arranged in a line in the left-right direction.

  A needle bar case for supporting the six needle bars 10 so as to be movable up and down is provided in the left-right direction at the front end part of the head part 4 provided at the tip part of each arm part 3 of the three embroidery sewing machines M1 to M3. It is arranged to be movable. On the other hand, the arm part 3 is connected to a leg column part, and the bed main body part 7 connected to the lower end part of the leg column part is fixed on the support plate 2 of the sewing machine. A cylinder bed 8 extends forward from the front end of the bed main body 7, and a thread catcher (not shown) or the like is provided at the front end of the cylinder bed 8. An operation panel 9 for an operator to perform various operations is also provided at the right end of the multi-head sewing machine M.

  As shown in FIGS. 3 and 4, each head portion 4 includes a needle bar case 5, an elevating drive mechanism 30 that transmits a vertical driving force from the sewing machine motor 110 (see FIG. 12) to the needle bar 10, Needle bar release mechanism 31 for cutting off transmission of driving force between needle bar 10 and elevating drive mechanism 30, thread pulling mechanism 32 including thread pulling member 62, and threading hook in the eye of sewing needle 15 A threading mechanism 33 or the like for threading by 83 is provided.

  As shown in FIGS. 2 and 3, each needle bar case 5 corresponding to the needle bar support means is swingable to six needle bars 10 extending in the vertical direction and positions corresponding to the needle bars 10. Six mounted scales 11, a first needle bar guide member 12 and a second needle bar guide member 13 which are fixed to the needle bar case 5 and guide the needle bar 10, extend in the left-right direction, and both ends of the needle bar case 5 There are provided a first thread holding member 14 supported by a fixing plate 17 fixed to the head, a second thread holding member 16 provided so as to correspond to each sewing needle 15, a presser foot 24, and the like.

  Each head portion 4 is provided with a needle bar case moving mechanism (corresponding to a needle bar moving means) (not shown) for moving the needle bar case 5 in the left-right direction. By driving the needle bar case moving mechanism, the needle bar case 5 is moved in the left-right direction, and the desired needle bar 10 among the six needle bars attached to the needle bar case 5 is driven by the drive shaft 22. It is connected to the state where force is transmitted. In this state, the sewing needle 15 attached to the desired needle bar 10 is positioned at a sewing position facing a needle hole (not shown) at the tip of the cylinder bed 8 and is threaded by the threading mechanism 33. It is configured to be positioned at a threading position for threading 15a.

  A connecting member 18 having a connecting pin 18a to which a driving force from the elevating drive mechanism 30 is transmitted is fixed to the center portion of the needle bar 10, and a needle is interposed between the connecting member 18 and the first needle bar guide member 12. A compression spring 19 that biases the bar 10 upward is fitted on the needle bar 10. A sewing needle 15 is attached to the lower end of each needle bar 10, and an embroidery thread T is supplied to each of the six sewing needles 15 from a thread stand 21 of a thread stand 20. The first yarn holding member 14 is for holding the yarn T drawn by the yarn drawing mechanism 32, and holds the yarn with the hook surfaces of two hook-type magic tapes (registered trademark) facing each other. It has the tape 14a and the reinforcement board 14b which clamps the thread | yarn holding tape 14a.

  The second thread holding member 16 temporarily holds the thread end of the thread T hung on the threading hook 83 before threading the thread T through the eye 15a of the sewing needle 15 during threading. And has a holding portion 16b for holding the thread T cut by the blade portion 16a, and a guide portion 16c whose tip is raised forward to guide the yarn T to the holding portion 16b. The thread T is passed from the right to the rear side of the guide part 16c from the right to the left, and when the thread T is guided to the blade part 16a, the thread T is pulled to the lower side of the front side, thereby cutting the thread T by the blade part 16a. The thread T is held between the needle holding part 16b and the front surface of the needle bar case 5, and the thread end part is held.

  When one of the needle bars 10 is selected by moving the needle bar case 5 to the left and right to switch one desired sewing needle 15 to a sewing position facing a needle hole (not shown) at the tip of the cylinder bed 8, The rotational driving force of the sewing machine motor 110 is transmitted to the lifting / lowering driving mechanism 30 as a driving force in the vertical direction by the driving shaft 22 (corresponding to the main shaft of claim 4), the V belt 23, and the like. 10 is swung up and down, and the balance 11 corresponding to the needle bar 10 is also swung up and down, and the color of the color selected by the cooperation of the sewing needle 15 of the needle bar 10 and the thread catcher is selected. A stitch is formed by the thread T.

  The drive shaft 22 is provided with a manual operation member such as a hand pulley (not shown) for the operator to manually move the needle bar 10 up and down, and the operator manually operates the manual operation member. Thus, by rotating the drive shaft 22, the vertical position of the sewing needle 15 attached to the needle bar 10 can be moved.

  As shown in FIGS. 3, 5, and 6, the elevating drive mechanism 30 includes a base needle bar 35 provided in parallel to the needle bar 10, and a drive supported by the base needle bar 35 so as to be slidable and non-rotatable. A member 36, a transmission member 37 supported so as to be movable up and down together with the drive member 36 and rotatably with respect to the base needle bar 35, one end abutting the drive member 36 and the other end abutting the transmission member 37 and transmitting The member 37 includes a first winding spring 38 that urges the needle bar 10 to a transmission position where the driving force can be transmitted to the needle bar 10.

  The thread drawing mechanism 32 wipes the thread T extending downward through the eye hole 15a of the sewing needle 15 at the end of sewing or changing the needle, and passes the thread T through the eye hole 15a of the sewing needle 15 when threading. Thus, the loop-shaped thread loop L hung on the threading hook 83 is eliminated.

  As shown in FIGS. 3, 5, and 6, the thread drawing mechanism 32 includes a drive motor 46, a sector gear 47 in which the detected body 60 is formed, and a thread drawing member for detecting the detected body 60. An origin detector 61, a thread pulling member 62, a connecting plate 63 that is swingably connected to the thread pulling member 62 and the sector gear 47 at both ends, a guide member 64 that guides the thread pulling member 62, and a guide member 64 And a lid member 65. The yarn pulling member 62 has a standing portion 62a that is swingably connected to the connecting plate 63, and a hook-like hook portion 62b for pulling the yarn T, and is held between the guide member 64 and the lid member 65. The guide member 64 is slidably supported in the guide groove 64a. The yarn pulling member origin detector 61 is a photo interrupter including a light receiving element and a light emitting element, and the yarn pulling when the edge of the lower end of the detected body 60 passes between the light receiving element and the light emitting element. The position of the member 62 is detected as the origin position. The guide groove 64 for guiding the thread pulling member 62 is arranged so that the thread pulling member 62 is moved to the position shown in FIGS. 4 and 6 when the drive motor 46 is rotated in the direction of arrow D to drive the needle bar releasing mechanism 31. It is formed to be able to move further backward from the standby position shown.

  In the yarn pulling mechanism 32, when the yarn is wiped, the sector gear 47 to which the driving force is transmitted from the driving motor 46 rotates in the direction of arrow E shown in FIG. 3, and the connecting plate 63 is driven forward and downward along with the rotation. The thread pulling member 62 connected to the lower end of the connecting plate 63 passes through the first thread holding member 14 while being guided by the guide groove 64a, and the thread dispensation position where the hook portion 62b reaches below the sewing needle 15 The hook portion 62b is engaged with the thread T extending downward through the eye hole 15a (see the two-dot chain line shown in FIG. 3). When the yarn pulling member 62 is returned to the standby position in this state, the yarn T engaged with the yarn pulling member 62 passes between the first yarn holding members 14 so that the yarn T is in the first yarn holding member 14. Is held by the yarn holding tape 14a.

  4 and 5, the threading mechanism 33 includes a threading motor 70 that is a pulse motor, and guide pins 72a that mesh with the output shaft 70a of the threading motor 70 and are fixed to the right sewing machine frame 73. 72b is connected to a rack 71 engaged with the guide groove 71a, one end connected to a connecting pin 74 fixed to the lower end of the rack 71, and the other end connected to a connecting protrusion 75 fixed to the guide frame 77. A tension spring 76 that urges 71 upward, a guide frame 77 that is fixed to the right sewing machine frame 73 and formed with a guide groove 77 a, and a connecting pin 74 that is positioned on the right side of the guide frame 77 at the lower end of the rack 71. Via a first guide pin 79 engaged with a guide groove 77a at a lower end portion of the crank plate 78, and a guide frame that is swingable. A pair of left and right thread hooking members 81 having a rectangular parallelepiped link block 80 connected to the left side of 77, and inclined portions 81a and 82a that are fixed to the tip of the link block 80 and guide the thread T to the threading hook 83; 82 and a threading hook 83 having a hook part 83a between which a thread T is hooked between a pair of threading members 81 and 82, and a threading hook detector for detecting the position of the threading hook 83 111 (see FIG. 12).

  A second guided pin 84 engaged with the guide groove 77 a is fixed to the center portion of the link block 80. The guide groove 77a has an inclined portion 77b and a horizontal portion 77c, and guides the link block 80 downward and forward first when threading, and then guides it forward in the horizontal direction.

  Next, threading by the thread drawing mechanism 32 and the threading mechanism 33 will be described. First, from the state where both the threading hook 83 and the thread pulling member 62 shown in FIG. 7 are in the standby state, the rack 71 is moved downward while being guided by the guide pins 72 a and 72 b by the threading motor 70, and is connected to the rack 71. The crank plate 78 and the link block 80 connected to the crank plate 78 first move downward and forward along the inclined portion 77b of the guide groove 77a, and then forward horizontally along the horizontal portion 77c. Moving. As shown in FIGS. 4 and 9, the link block 80 moves until the hook portion 83a of the threading hook 83 passes through the eye 15a of the sewing needle 15, and the second guided pin 84 moves to the front end of the guide groove 77a. Stops at the yarn hooking position in contact with the part. Thereby, the threading hook 83 reaches the insertion position where it is inserted into the eye hole 15a.

  Next, as shown in FIGS. 2 and 4, the operator hooks the thread T guided by the thread guides 85, 86 and the like from the right onto the thread hooking members 81, 82, and the thread T is threaded to the second thread holding member. The blade 16 is cut by the 16 blade portions 16a, and the free end portion of the thread T is sandwiched and held between the holding portion 16b and the front surface of the needle bar case 5. At this time, as shown in FIGS. 9 and 10, the operator pulls the yarn T hung on the yarn hooking members 81 and 82 upward, so that the yarn T is inclined by the inclined portions 81 a and 81 b of the yarn hooking members 81 and 82. It is guided to the threading hook 83 by 82a and hooked on the hook portion 83a.

  Next, the threading hook 83 is separated by a predetermined distance rearward by the threading motor 70 and stopped at the loop release position located on the rear side of the sewing needle 15. As a result, as shown in FIG. 7, the threading hook 83 (hook portion 83a) is moved to the retracted position, which is a position sufficiently separated from the eye hole 15a.

  Next, as shown in FIG. 8, the threading member 62 is inserted into the thread loop L by the drive motor 46 and the thread pulling position is below the thread loop L. The free end F of the yarn loop L is engaged with the hook portion 62b by moving along the locus. This yarn pulling position is located above the yarn wiping position and has a shorter moving distance than the yarn wiping.

  At this time, the free end of the yarn T is in a state where the yarn holding of the second yarn holding member 16 is released, the tension of the yarn T is loosened, and the yarn loop L is engaged with the threading hook 83, which is shown in FIG. Thus, the thread loop L between the threading hook 83 and the eye hole 15a does not hang downward, and the width in the left-right direction is increased. Further, as shown in FIG. Is located below the eye hole 15a of the sewing needle 15, so that the thread loop L is substantially perpendicular to the thread pulling member 62. Therefore, the thread pulling member 62 is surely passed between the thread loops L and thread T Can be engaged.

  Next, when the thread pulling member 62 is returned to the standby position by the drive motor 46, the free end side F of the thread loop L held between the threading hook 83 and the eye hole 15a of the sewing needle 15 is pulled. As a result, the thread loop L is eliminated by detaching from the eye hole 15a and also from the threading hook 83, and the thread pulling member 62 passes through the first thread holding member 14 while pulling the free end side F of the thread T. Thus, the yarn T is held by the yarn holding tape 14a of the first yarn holding member 14. Then, the thread T is completely threaded through the eye hole 15a. Next, the threading hook 83 is returned to the standby position by the threading motor 70, and the threading is completed.

  Next, the control unit 100 including the computer 101 will be described based on the block diagram of FIG. The control unit 100 governs overall control of the embroidery sewing machines M1 to M3 such as the threading mechanism 33 and the thread drawing mechanism 32. The control unit 100 includes a CPU 102, a ROM 103, a RAM 104, a computer 101 including a bus 105 for connecting them, an input / output interface 106 for inputting / outputting to / from the computer 101, and a sewing machine connected to the input / output interface 106. A drive circuit 107 for the motor 110, a drive circuit 108 for the drive motor 46, and a drive circuit 109 for the threading motor 70 are included. The control unit 100 is connected to a power switch 115 that switches between a power supply state and a cut-off state for the control unit 100 and various drive mechanisms of the embroidery sewing machines M1 to M3.

  The input / output interface 106 includes a thread pulling member origin detector 61 for detecting the position of the thread pulling member 62 and a threading hook to be described later corresponding to threading hook detecting means for detecting the position of the threading hook 83. A state detector 112 (to be described later) corresponding to the detector 111 and the state detector is also connected. In the ROM 103, a threading control program for driving and driving the drive motor 46 and the threading motor 70, a control program for moving the threading hook to the retracted position according to the present embodiment, and the like are recorded in a readable manner. ing. The RAM 104 stores various data such as position data received from the thread drawing member origin detector 61, the threading hook detector 111, and the like.

  In the present embodiment, the threading hook detector 111 described above is a sensor (insertion position detection) that detects that the threading hook 83 is located at the insertion position where the threading hook 83 is inserted into the eye 15a of the sewing needle 15. Although not shown, the threading hook 83 is detected by detecting the position of the rack 71 that is moved by driving a threading motor 70 for moving the threading hook 83 forward and backward. It is configured to detect the position at the insertion position and output the detection signal to the control unit 100.

  In the present embodiment, the state detector 112 described above includes a drive shaft detection sensor, a needle bar case (not shown) that detects that an operation of rotating the drive shaft 22 for moving the needle bar 10 up and down has been performed. A needle bar case detection sensor (not shown) that detects that the 5 is moved in the left-right direction, and a power sensor (not shown) that detects that the power switch 115 is operated and switched to a power-off state in which the supply of power is cut off. It is configured. In the present embodiment, the rotation operation of the drive shaft 22, the movement operation of the needle bar case 5, the power cut-off operation by the power switch 115, and the like correspond to the predetermined state relating to the operation of the sewing machine according to claim 1, A detection signal is output to the control unit 100 based on the detection of any one of these predetermined states by the sensors.

  The drive shaft detection sensor is a well-known main shaft sensor (NP sensor) provided for detecting the rotation position (needle bar position) of the drive shaft by detecting the rotation of the drive shaft 22 in a general sewing machine. The main shaft sensor is configured to detect that the drive shaft 22 has been rotated by the operator operating the drive shaft 22 by operating the hand pulley or the like. ing. The needle bar case detection sensor includes a needle bar support (a needle bar case 5 of the present application) that supports a plurality of needle bars and a moving mechanism that moves the needle bar support means for needle bar selection or the like. A known needle bar support movement detection sensor used for detecting that the needle bar support is moved in the left-right direction in a general multi-needle sewing machine equipped with a needle bar moving means of the present application). The sensor is configured to detect that the needle bar case 5 has moved in the left-right direction by instructing the operator to move the needle bar case 5 or pressing the needle bar case 5 by hand. Yes.

  Next, according to the present embodiment, a retraction control program executed by the control unit 100 to the computer 101 in order to retract the threading hook 83 to a predetermined retraction position sufficiently retracted from the eye 15a of the sewing needle 15 will be described. This will be described with reference to the flowchart of FIG. This save control program is always executed every 1 ms by timer interrupt processing.

  First, in step S10, the threading hook detector 111 (corresponding to the insertion position detecting means) detects that the threading hook 83 is located at the aforementioned insertion position in the eye 15a of the sewing needle 15. It is determined whether or not there is. If it is not detected by the threading hook detector 111 that the threading hook 83 is located at the insertion position (S10: No), the process is terminated. On the other hand, if it is detected by the threading hook detector 111 that the threading hook 83 is located at the insertion position (S10: Yes), the predetermined state of the sewing machine is determined by the state detector 112. It is determined whether or not it has been detected (S11).

  In step S11, when none of the above-mentioned predetermined states is detected by the state detector 112 (S11: No), the process is terminated. On the other hand, if any one of the above-mentioned predetermined states is detected (S11: Yes), the threading motor 70 is driven and the threading hook located at the insertion position in step S12. 83 is retracted to a retracted position separated from the eye hole 15a, and the process is terminated.

  Therefore, at the time of the determination in step S11, for example, the operator performed an operation of rotating the drive shaft 22 by operating the above-described hand pulley (not shown) (in other words, an operation of moving the needle bar 10 up and down). In this case, or when an operation for moving the needle bar case 5 in the left-right direction (in other words, an operation for moving the needle bar 10 in the left-right direction) is performed, the threading motor 70 is immediately driven and the threading hook 83 is moved. Since the retracting position is moved away from the eye hole 15a of the sewing needle 15, the threading hook 83 can be prevented from being damaged by colliding with the sewing needle 15.

  Further, in the sewing machine of the present embodiment, a predetermined operation including driving of the threading motor 70 is performed even when the power is cut off by the operation of the power switch 115 by storing electric charge in a capacitor or the like (not shown). Even when it is detected by the state detector 112 that the power has been cut off at the time of the above-described determination in step S11, the threading motor 70 is driven in step S12. The threading hook 83 is configured to be retracted to the aforementioned retracted position.

  As described above, in the sewing machine of the present embodiment, when the threading hook 83 is present at the position inserted into the eye hole 15a, the needle bar 10 (needle bar) by operating the drive shaft 22 of the sewing machine or the needle bar case 5 is used. When the sewing needle 15) attached to the sewing machine 15) is moved or when the sewing machine power is cut off, the threading hook 83 is retracted from the eye hole 15a, so that the threading hook 83 is damaged. Can be prevented.

  In the present embodiment, the sensor for detecting that the threading hook 83 is located at the insertion position where the threading hook 83 is inserted into the eye hole 15a has been described as an example of the threading hook detector 111. The hook detector 111 may be configured by a sensor (corresponding to a retracted position detecting means) that detects that the threading hook 83 is located at a separated position sufficiently separated from the eye hole 15a. In this case, the determination process in step S10 described above is performed to determine whether or not the threading hook 83 is located at the separation position, and when the threading hook 83 is not located at the separation position, What is necessary is just to make it progress to the determination process of S11.

  In the above embodiment, the state detector 112 has been described by taking a sensor that detects that the needle bar case 5 included in the multi-needle sewing machine has been moved in the left-right direction as an example, but it is not a multi-needle sewing machine. In a zigzag sewing machine that includes a single needle bar and swings the needle bar in the left-right direction, a sensor that detects that the needle bar has been swung is used to make the present invention a single needle bar. It can also be applied to a zigzag sewing machine with a bar.

1 is an overall view of a multi-head sewing machine according to an embodiment of the present invention. It is a front view of a needle bar case. It is a left view of the principal part in the sewing machine for embroidery. It is a right view of the principal part in the sewing machine for embroidery. It is a front view of the principal part in the sewing machine for embroidery. It is a top view of the principal part in the sewing machine for embroidery. It is a right view explaining the threading operation of the embroidery sewing machine. It is a right view explaining the threading operation of the embroidery sewing machine. It is a longitudinal cross-sectional view around the eye of the sewing needle in the thread hooked state. FIG. 5 is a plan view of the vicinity of the eye of the sewing needle in the thread hooked state. It is a top view around the eye hole of the sewing needle in the state where the thread loop was formed. It is a block diagram of schematic structure of a control unit. It is a flowchart explaining an evacuation program.

Explanation of symbols

M Multi-head sewing machine M1 to M3 Embroidery sewing machine 10 Needle bar 15 Sewing needle 33 Threading mechanism 70 Threading motor 83 Threading hook 100 Control unit 111 Threading hook detector 112 Status detector T Thread

Claims (6)

A threading hook capable of moving forward and backward with respect to the stitch hole of the sewing needle; and a threading hook moving means for moving the threading hook, and the threading hook is inserted into the stitch hole of the sewing needle by the moving means. And a sewing machine provided with a threading device for threading the eye of the sewing needle by retracting and moving,
Threading hook detection means for detecting the position of the threading hook;
State detecting means for detecting a predetermined state relating to the operation of the sewing machine;
Based on the position of the threading hook detected by the threading hook detecting means and the predetermined state of the sewing machine detected by the state detecting means, the threading hook moving means is driven to drive the threading hook. Movement control means for retreating to a retreat position separated from the eye of the sewing needle,
A sewing machine characterized by comprising: The threading hook detection means includes an insertion position detection sensor for detecting that the threading hook is positioned at an insertion position inserted into the eye of the sewing needle,
When the predetermined state of the sewing machine is detected by the state detection means in a state where the insertion position detection sensor detects that the threading hook is located at the insertion position, The sewing machine according to claim 1, wherein the threading hook is retracted from the insertion position to the retracted position. The threading hook detection means includes a retracted position detection sensor that detects whether the threading hook is positioned at a predetermined retracted position separated from the eye of the sewing needle,
The movement control unit is configured to detect the predetermined state of the sewing machine by the state detection unit in a state where the threading hook is not positioned at the predetermined retracted position by the retracted position detection sensor. The sewing machine according to claim 1, wherein the threading hook is retracted to the predetermined retracted position. The state detecting means includes an operation of rotating a sewing machine main shaft for moving the needle bar holding the sewing needle up and down, a movement of the needle bar in the horizontal direction, and a power source of the sewing machine. Detecting at least one condition of being blocked;
The movement control means retracts the threading hook to the retracted position based on the position of the threading hook detected by the threading hook detecting means when the at least one state is detected. The sewing machine according to any one of claims 1 to 3, wherein: A plurality of needle bars; needle bar support means for supporting the needle bars; and needle bar moving means for moving the needle bar support means in the left-right direction;
By moving the needle bar support means in the left-right direction by the needle bar moving means, any one of the needle bars supported by the needle bar support means is selectively opposed to the threading hook. Is configured to be threadable through the eye of the sewing needle attached to the needle bar,
The state detection means detects that the needle bar support means has been moved in the left-right direction,
The movement control means retracts the threading hook to the retracted position based on the position of the threading hook detected by the threading hook detecting means when the movement of the needle bar support means is detected. The sewing machine according to any one of claims 1 to 3, wherein 6. The threading hook moving means comprises a pulse motor and driving force transmitting means for transmitting the driving force of the pulse motor to the threading hook to move the threading hook. The sewing machine according to any one of the above.

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