JP3797292B2 - Yarn hooking device for yarn guide and sewing machine equipped with this yarn hooking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a yarn hooking device for a yarn guide and a sewing machine equipped with the yarn hooking device, in particular, one that can be automatically hooked to a yarn guide below a needle bar.
[0002]
[Prior art]
  Conventionally, the needle bar of the sewing machine has often been provided with a thread guide for guiding the thread from the balance to the eye of the sewing needle along the needle bar, and is supported at the lower end of the needle bar. It is necessary to thread the thread guide before threading the stitch needle. Here, in recent years, various sewing machines configured to automatically perform the threading operation have been proposed or put into practical use. However, even in these sewing machines, the thread before automatically threading is used. The threading work for the guide was performed manually by the worker himself.
[0003]
[Problems to be solved by the invention]
  However, in preparation for sewing, the thread guide may be very close to the sewing machine head depending on the stop position of the needle bar. For example, regardless of whether the sewing machine is equipped with a threading device, the needle bar needs to be close to the uppermost position in order to pass the thread through the eye of the sewing needle. The thread guide is in a state of approaching the sewing machine head. Alternatively, when the needle bar is raised to put in and out the cloth between the sewing needle and the bed portion, the thread guide comes close to the sewing machine head. In this approaching state, it is difficult for the operator to see the thread guide, or because the gap between the thread guide and the machine head is narrow, it is difficult for the operator to thread the thread guide. In addition, it is troublesome to lower the position of the needle bar after completion of threading and entering / exiting the cloth and then thread the thread guide onto the thread guide, resulting in a reduction in work efficiency.
[0004]
  An object of the present invention is to efficiently perform a sewing preparation work by automatically performing a thread hooking operation on a thread guide with the mounting of a thread cassette.
[0005]
[Means for Solving the Problems]
  According to another aspect of the present invention, there is provided a yarn hooking device for a yarn guide, which includes a yarn cassette that houses a yarn supply source and is detachably mounted on a cassette mounting portion of a sewing machine, and a first yarn guide below a needle bar that supports a sewing needle.A second thread guide provided near the lower end of the sewing machine head and spaced apart from the first thread guide by a predetermined distance;A threading device for a thread guide of a sewing machine having a threading hook having a threading hook, and a standby position where the thread led out from the thread cassette is not threaded and a working position where threading is possible A hook member that can move between and an operation force addition member that adds an operation force for switching the hook member between a standby position and an action position;The first yarn guide and the second yarn guide each have a yarn hooking portion for hooking the yarn, and each has a yarn hooking portion that opens in substantially the same direction. The operating position of the hook member is from the standby position. Is also located in the opening direction of the thread hook,The hook member is moved by the operation force acting on the operation force adding member from the yarn cassette in conjunction with the attaching operation of the yarn cassette.Between the first thread guide and the second thread guideThe first thread guide is switched over between a standby position and an operating position.And the second thread guideIt is configured to hang the thread.
[0006]
  This yarn hooking device for the yarn guide hooks the yarn on the yarn hook by switching the hook member from the standby position where the yarn drawn from the yarn cassette is not hooked to the yarn hook to the working position where the yarn can be hooked.1st and 2ndThe yarn guide is configured to be threaded. Here, the operating force for switching the hook member in this way acts on the operating force adding member in conjunction with the thread cassette mounting operation when the thread cassette is mounted on the cassette mounting portion. It is transmitted from the operation force addition member to the hook member, and the hook member is switched over between the standby position and the action position. By configuring the yarn hooking device in this way, it is automatically linked with the loading operation of the yarn cassette.1st and 2ndA thread is hung on the thread guide.Further, since the working position for hooking the thread onto the thread hook is located in the opening direction of the thread hooks of the first and second thread guides relative to the standby position, even when the hook member is in the standby position, the thread sags. Thus, even if the yarn is positioned near the opening of the yarn hooking portion, the yarn hook and the yarn are separated. When the hook member is switched to the operating position, the thread is hooked on the thread hook. Further, the hook member moves between the standby position and the operating position between the first thread guide and the second thread guide, and the hook member is moved in the opening direction of the thread hooking portion while the thread is hooked on the thread hook. Since the yarn enters the back end portion of the yarn hooking portion, the yarn is hooked on the first and second yarn guides.
[0007]
  The yarn hooking device to the yarn guide according to claim 2 is the invention according to claim 1,A base member fixed to a lower portion of the head of the sewing machine, a movable member attached to the base member so as to be slidable, and pivotally attached to the movable member and interlocked with the hook member so that the operation force is input. A rotating arm having an operating force input unit, and an operating force transmission mechanism for transmitting an operating force acting on the operating force adding member to the operating force input unit of the rotating arm.It is a thing.When an operation force for switching the hook member is applied to the operation force addition member in conjunction with the yarn cassette mounting operation, this operation force is transmitted to the operation force input portion of the rotating arm by the operation force transmission mechanism. Since the rotating arm is pivotally attached to the movable member and interlocked with the hook member, when the operating force is input to the operating force input portion, the rotating arm rotates by a predetermined angle and the rotation is performed. In conjunction, the hook member is switched from the standby position to the operating position. In this way, when the hook member is switched to the operating position and the yarn hook is hooked, the rotating arm and the hook member slide together with the movable member relative to the base member. The drawn yarn is drawn toward the yarn guide side, and the yarn is hung on the first and second yarn guides.
[0008]
  The yarn hooking device for the yarn guide according to claim 3Item 2In the invention ofThe operating force transmission mechanism includes a link member pivotally attached to the operating force adding member so that a middle portion thereof is pivotable, a distal end arm portion formed in a bent shape at the distal end portion of the link member, and the link A cam plate having a driven pin provided at the base end of the member and an arcuate cam groove with which the driven pin is engagedIt is equipped with.
[0009]
  In conjunction with the operation of attaching the thread cassette,The applied operating force is transmitted to the operating force input portion of the rotating arm via the link member, but the base end portion of the link member is guided to the cam groove of the cam plate via the driven pin. The member moves smoothly in the horizontal direction.
[0010]
  Therefore, the operating force input part of the rotating arm is pressed almost horizontally by the tip arm part, and sliding friction is prevented as much as possible between the tip arm part and the operating force input part.It is done.
[0011]
  According to a fourth aspect of the present invention, there is provided the yarn hooking device for the yarn guide.When the yarn cassette is attached, the rotary arm is driven in a substantially horizontal direction by the tip arm while the lower end of the tip arm is in contact with the operation force input part of the rotary arm. A first swing for switching the hook member from the first standby position to the operating position, and the hook member and the rotating arm switched to the operating position are slid together with the movable member to move the first and second threads. The slide movement for hooking the thread on the guide and the second swing for swinging the hook member to the second standby position after threading are configured.It is a thing.
[0012]
  For thread cassette loading operationWhen an operating force for switching the hook member acts on the operating force adding member,Operating force is a link memberFrom the tip arm ofTransmitted to the operating force input section of the rotating arm.To drive the pivot arm almost horizontally. Then, the pivot arm pivots by a predetermined angle, and in conjunction with the pivot, the first swing is performed in which the hook member swings from the first standby position to the operating position, and the thread is hooked onto the thread hook. It is hung. Subsequently, when an operating force is input to the operating force input portion of the rotating arm, the rotating arm and the hook member are slid together with the movable member in a state where the hook member is switched to the operating position, and the first and second A sliding movement for threading the thread guide is performed. At this time, since the hook member is attracted to the first and second thread guides while the thread is hooked on the thread hook, the thread is hooked on the first and second thread guides. Furthermore, when the operating force is input to the operating force input unit, the second swing is performed to swing the hook member to the second standby position, and the thread can be removed from the thread hook.
[0013]
  The yarn hooking device for the yarn guide according to claim 5 is:Yarn hooking on a thread guide of a sewing machine provided with a first thread guide below the needle bar for supporting the sewing needle and a second thread guide provided near the lower end of the head of the sewing machine and spaced from the first thread guide by a predetermined distance A hook member having a thread hook and movable between a standby position where no thread is hooked on the thread hook and an operating position where the thread can be hooked, and the hook member serving as a standby position and an operating position. An operation force adding member for adding an operation force for switching between the first thread guide and the second thread guide, which are thread hook portions for hooking the thread, and in substantially the same direction. The hook member is located in the opening direction of the yarn hooking portion rather than the standby position, and the hook member is moved by the operating force acting on the operating force adding member. Between the one yarn guide and the second yarn guide, the standby position and the operating position Subjecting the yarn to the first yarn guide and the second thread guide is switched TeIt is comprised as follows.
[0014]
  The yarn hooking device for the yarn guide is configured to hook the yarn on the yarn hook by switching the hook member from a standby position where the yarn hook is not hooked to a working position where the yarn can be hooked. It is configured to thread the guide. Here, the operation force for switching the hook member in this way acts on the operation force addition member, and this operation force is transmitted from the operation force addition member to the hook member, so that the hook member is moved between the standby position and the operation position. Can be switched. By configuring the yarn hooking device in this way, the yarn is automatically moved to the first and second yarn guides in conjunction with the loading operation of the yarn cassette. Will be applied.
[0015]
  Further, since the working position for hooking the thread onto the thread hook is located in the opening direction of the thread hooks of the first and second thread guides relative to the standby position, even when the hook member is in the standby position, the thread sags. Thus, even if the yarn is positioned near the opening of the yarn hooking portion, the yarn hook and the yarn are separated. When the hook member is switched to the operating position, the thread is hooked on the thread hook. Further, the hook member moves between the standby position and the operating position between the first thread guide and the second thread guide, and the hook member is moved in the opening direction of the thread hooking portion while the thread is hooked on the thread hook. Since the yarn enters the back end portion of the yarn hooking portion, the yarn is hooked on the first and second yarn guides.
[0016]
  Claim 6sewing machineIsA thread cassette that houses a thread supply source and is detachably mounted on a cassette mounting portion of the sewing machine;A first thread guide at the bottom of the needle bar that supports the sewing needle;Near the bottom of the machine headA sewing machine comprising a second yarn guide spaced a predetermined distance from the first yarn guidesmellAndA threading device for threading the first thread guide and the second thread guide;It has a thread hook and this thread hookDerived from the yarn cassetteA hook member that can move between a standby position where no yarn is applied and an action position where the yarn can be applied, and an operation force addition member that adds an operation force for switching the hook member between the standby position and the action position. AndThe first yarn guide and the second yarn guide each have a yarn hooking portion for hooking the yarn, and each has a yarn hooking portion that opens in substantially the same direction. The operating position of the hook member is from the standby position. Is also located in the opening direction of the yarn hooking portion, and in conjunction with the yarn cassette mounting operation,The hook member is moved by an operating force acting on the operating force adding member.Between the first thread guide and the second thread guideSwitching between a standby position and an action position so that the thread is hooked on the first thread guide and the second thread guideThe threading deviceIt is composed.
[0017]
Since the sewing machine includes the yarn hooking device configured in the same manner as in the first aspect, the operation is the same as that in the first aspect, and the description thereof is omitted.
[0018]
  The sewing machine according to claim 7 is provided with a first thread guide at a lower portion of a needle bar for supporting a sewing needle, and a second thread guide provided near a lower end of a sewing machine head and separated from the first thread guide by a predetermined distance. A threading device for threading the first thread guide and the second thread guide, the threading device having a threading hook, and a standby position where the threading hook is not threaded. A hook member that is movable between a hook position and a threading action position; and an operation force addition member that adds an operation force for switching the hook member between a standby position and an action position. The one yarn guide and the second yarn guide each have a yarn hooking portion for hooking the yarn, and each has a yarn hooking portion that opens in substantially the same direction, and the operating position of the hook member is greater than the standby position. Located in the opening direction of the thread hook,The hook member is moved by an operating force acting on the operating force adding member.Between the first thread guide and the second thread guideWait inMachine position and working positionAnd the thread is hung on the first thread guide and the second thread guide.Is.
[0019]
Since this sewing machine includes the yarn hooking device configured in the same manner as the above-described fifth aspect, this operation is the same as that of the fifth aspect, and the description thereof is omitted.
[0020]
[0021]
[0022]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present embodiment is an example in which the present invention is applied to a household sewing machine configured to automatically thread a thread through a stitch needle in conjunction with a thread cassette mounting operation.
[0023]
  As shown in FIGS. 1 and 2, a household sewing machine M includes a bed portion 1 having a horizontal bed surface, a pedestal portion 2 erected on the right end portion of the bed portion 1, and a pedestal portion 2. The arm portion 3 extends leftward from the upper portion so as to face the bed portion 1, and the head portion 4 is provided at the left end portion of the arm portion 3. The head 4 is provided with a cassette mounting portion 5 on which the thread cassette 10 is detachably mounted, and the upper thread 11 is led out from the thread cassette 10 mounted on the cassette mounting portion 5. The head 4 of the arm unit 3 is provided with operation switches (not shown) such as a sewing start switch and a sewing end switch. In addition, the arm unit 3 is provided with a liquid crystal display 7 with the screen facing the front.
[0024]
  As shown in FIGS. 2 and 3, the head 4 includes a needle bar 12, a balance 13 (see FIG. 10), a thread tension mechanism 14 for adjusting the thread tension of the upper thread 11 led out from the thread cassette 10, a thread When the cassette 10 is mounted on the cassette mounting portion 5, the upper thread 11 is automatically threaded through the eye hole 15 a of the sewing needle 15 supported by the needle bar 12, for threading by the threading mechanism 16. The main portion of the thread holding mechanism 17 that holds the upper thread 11 near the eye hole 15a of the sewing needle 15, the upper thread 11 provided at the lower end of the needle bar 12 when the thread cassette 10 is mounted on the cassette mounting portion 5. A yarn threading mechanism 18 and the like for automatically threading the first yarn guide 19 and the second yarn guide 20 provided near the lower end of the head 4 are provided.
[0025]
  The two thread guides 19 and 20 are respectively provided at positions that are separated from each other by a predetermined distance in the lower part of the head 4, and the two thread guides 19 and 20 are respectively thread threading portions 19 a and 20 a for hanging the upper thread 11 (see FIG. 24). The thread hooks 19a and 20a are both formed so as to open in substantially the same direction (rightward) and substantially horizontally. Further, although not shown, the head 4 is also provided with a needle bar vertical movement mechanism for moving the needle bar 12 up and down, a needle bar rocking mechanism for rocking the needle bar 12, and a balance driving mechanism for rocking the balance 13 up and down. It has been.
[0026]
  As shown in FIGS. 1 and 2, the upper thread 11 led out from the thread cassette 10 mounted on the cassette mounting section 5 is a thread tension shaft (not shown) between a pair of thread tension plates of the thread tension mechanism 14. ) And the upper thread 11 extending from the thread tension shaft to the downstream side is hung on the balance 13. Further, the upper thread 11 extending downstream from the balance 13 is held in the vicinity of the eye hole 15 a of the sewing needle 15 by the thread holding mechanism 17, and then passed through the eye hole 15 a by the threading mechanism 16, and by the thread hooking mechanism 18. The upper thread 11 is hung on the two thread guides 19 and 20, and the upper thread 11 is set so as to be sewn. Here, as will be described later, the operations of the threading mechanism 16, the thread holding mechanism 17, and the thread hooking mechanism 18 are automatically performed in conjunction with the mounting operation of the thread cassette 10.
[0027]
  On the other hand, the bed portion 1 is provided with a bobbin mounting portion (not shown), and a thread extending from a bobbin (not shown) mounted on the bobbin mounting portion is used as a lower thread. The bed 1 is provided with a shuttle mechanism (not shown). When the sewing machine motor (not shown) is driven with the upper thread 11 and the lower thread set to be sewn, the needle bar 12 is moved up and down by the needle bar vertical movement mechanism, and the shuttle mechanism is driven in synchronism with this. Then, the upper thread 11 in the vicinity of the sewing needle 15 lowered below the needle plate 1a of the bed portion 1 is hooked by the hook mechanism, and the upper thread 11 and the lower thread are entangled to form a stitch. .
[0028]
  Here, the yarn cassette 10 will be described. 4 to 7, the yarn cassette 10 includes a cassette body 30 and an opening / closing member 31 pivotally attached to the cassette body 30, and a yarn piece 32 serving as a yarn supply source is provided therein. A thread accommodating portion 33 for accommodating is formed. A thread stand 34 is attached to the opening / closing member 31, and when the opening / closing member 31 is opened to the front (see FIG. 5), the thread spool 32 can be attached to and detached from the thread stand 34, and the thread spool 32 becomes the thread standing bar. When the opening / closing member 31 is closed while being attached to the thread 34, the thread spool 32 is accommodated in the thread accommodating portion 33.
[0029]
  The upper thread 11 is set as follows in the state of the thread cassette 10 in which the preparation for mounting on the cassette mounting portion 5 is completed. That is, the upper thread 11 extends upward from the thread spool 32 and is led out of the thread accommodating portion 33, and passes through the thread path 35 between the cassette body 30 and the left end of the opening / closing member 31, and then the lower left of the thread cassette 10. It is hung on the thread hook 36a at the end. From here, the upper thread 11 extends rightward and is hooked on the thread hooking portion 36b at the lower end of the partition wall 37 and the thread hooking portion 36c at the lower right end of the yarn cassette 10, and further extends forward and then the thread hooking portion 36d. The thread holding portion 38 extends to the left and is held by the thread holding portion 38, and is further cut by the blade 39 on the left side of the yarn holding portion 38 and hung on the yarn hooking portion 36 e.
[0030]
  By the way, a balance guide space 40 that opens rearward and downward is formed on the right side portion of the yarn cassette 10 over almost the entire length, and a thread tension space that opens downward in the central portion of the lower end portion of the yarn cassette 10. 41 is formed, and these spaces 40 and 41 are partitioned by a partition wall 37. A pair of left and right relief grooves 43 a and 43 b for preventing the holding member 70 of the yarn holding mechanism 17 from interfering with the front surface portion of the right side portion of the yarn cassette 10 are provided on the front surface portion of the right side portion of the yarn cassette 10. Is formed.
[0031]
  When the thread cassette 10 is lowered and inserted into the cassette mounting portion 5, the balance 13 enters the balance guide space 40 from below, and the thread tension mechanism 14 enters the thread tension space 41 from below. When the yarn cassette 10 is slightly inserted into the cassette mounting portion 5, first, the yarn portion 11 a between the yarn hooking portions 36 b and 36 c of the upper yarn 11 is hooked on the balance 13 that has entered the balance guide space 40.
[0032]
  When the yarn cassette 10 is further inserted into the cassette mounting portion 5 from this state, the yarn portion 11b between the yarn hooking portions 36a and 36b is held by the yarn tension mechanism 14 that has entered the thread tension space 41. On the other hand, the yarn portion 11c between the yarn hooking portion 36d and the yarn holding portion 38 is pulled and held by the yarn holding mechanism 17 to the vicinity of the eye hole 15a of the sewing needle 15 (see FIG. 22). A cam member 42 (described later) that swings and drives the yarn clamping member 74 of the yarn holding mechanism 17 is also provided between the yarn hooking portion 36d and the yarn holding portion 38.
[0033]
  Next, the threading mechanism 16 will be described. As shown in FIG. 8, the threading mechanism 16 includes a threading shaft 50 and a slider guide shaft 51 disposed on the left side of the needle bar 12 so as to be vertically movable, and upper ends of the threading shaft 50 and the slider guide shaft 51. A threading slider 52 that is externally fitted to the threaded portion and a lower end portion of the threading shaft 50 are connected to the threading shaft 50, and the upper thread 11 is passed through the eye 15a of the sewing needle 15 in conjunction with the turning operation of the threading shaft 50. A hook mechanism 53 and a threading shaft driving member 54 for driving the threading shaft 50 downward in conjunction with the mounting operation of the thread cassette 10 are provided.
[0034]
  The threading shaft 50 and the slider guide shaft 51 are supported by the needle bar base 55 together with the needle bar 12, and the needle bar 12, the needle bar base 55, the threading shaft 50, and the slider guide shaft 51 swing the needle bar. The mechanism is arranged so as to be swingable integrally. Here, it is necessary to set the needle bar 12 (sewing needle 15) at a predetermined position where the upper thread 11 held by the thread holding mechanism 17 described later can be passed through the eye hole 15a by the hook mechanism 53. Therefore, in the state immediately before the threading operation by the threading mechanism 16 (the state immediately before the thread cassette 10 is mounted), the needle bar 12 is in the position that is swung to the leftmost side. Further, with respect to the vertical position, the needle bar 12 is at a position where the upper thread 11 can be passed through the eye hole 15a, specifically, at a predetermined position slightly below the uppermost position.
[0035]
  Pin members 56a and 56b protrude from the upper end portion of the threading shaft 50 and the middle part in the vertical direction, respectively. When the threading shaft 50 is lowered by a predetermined amount, the pin member 56b is located in the middle part in the vertical direction of the needle bar 12. Engages with the fixed regulating member 12c. Further, the threading shaft 50 is provided with a coil spring 57 that urges the threading slider 52 upward. A coil spring 58 that urges the threading slider 52 upward is provided on the upper half of the slider guide shaft 51. The threading slider 52 is formed with a cam groove 52a composed of an upper half straight groove and a lower half spiral groove. Further, the threading slider 52 is also provided with a protruding plate 59 protruding upward. A horizontal surface (not shown) is formed on the rear surface side of the protruding plate 59.
[0036]
  As shown in FIGS. 8 and 9, the hook mechanism 53 includes a threading hook 60 for hooking the upper thread 11, two guide members 61 and 62 located on both sides of the threading hook 60, and these threading hooks 60. A thread holding wire 63 that penetrates the guide members 61 and 62 horizontally, and a hook holding member 64 that is fixed to the lower end of the threading shaft 50 and holds the threading hook 60, the guide members 61, 62, and the like. As shown in FIG. 9, a hook portion 60a is formed at the tip of the threading hook 60. During threading, the hook portion 60a is inserted into the eye hole 15a of the sewing needle 15, and the threading hook 60 is The upper thread 11 held near the eye hole 15a is hooked by the thread holding mechanism 17 described later while being guided by the two guide members 61 and 62 from both sides.
[0037]
  The threading shaft drive member 54 is rotatably connected to a slide member 66 that is externally fitted to the guide shaft 65 so as to be slidable up and down, and is urged by a torsion spring 67 in the clockwise direction of FIG. ing. On the other hand, the slide member 66 is biased upward by a coil spring 68. The upper end of the threading shaft driving member 54 is formed with a driving force transmitting portion 54a that contacts the horizontal surface of the protruding plate 59 and transmits the driving force when the thread cassette 10 is mounted to the threading slider 52. A cam portion 54 b is formed at the lower end of the drive member 54 to block transmission of drive force to the threading slider 52. On the other hand, a cam member 69 having an inclined tip cam portion 69a is fixed to the lower end portion of the guide shaft 65, and when the threading shaft drive member 54 moves downward by a predetermined amount, the cam member 69 cams on the tip cam portion 69a. The part 54b comes into contact.
[0038]
  The threading operation by the threading mechanism 16 will be described. When the threading shaft driving member 54 is driven downward against the biasing force of the coil spring 68 in conjunction with the mounting operation of the thread cassette 10, the driving force transmitting portion 54a comes into contact with the horizontal surface of the protruding plate 59, Since the driving force is transmitted to the protruding plate 59 of the threading slider 52, the threading shaft 50 and the slider guide shaft 51 also move downward. When the threading shaft 50 moves downward by a predetermined amount, the pin member 56b engages with the restricting member 12c and the threading shaft 50 does not move any further. However, the threading slider 52 resists the biasing force of the coil spring 58. And move further downward. At this time, since the pin member 56a provided on the threading shaft 50 moves relatively along the cam groove 52a of the threading slider 52, the threading slider 52 moves downward with respect to the threading shaft 50. Is converted into a turning operation of the threading shaft 50, and the threading shaft 50 is rotated by a predetermined angle. At this time, as shown in FIG. 9A, the hook mechanism 53 provided at the lower end portion of the threading shaft 50 also rotates integrally with the threading shaft 50 toward the sewing needle 15, and the hook of the threading hook 60. The portion 60 a passes through the eye hole 15 a of the sewing needle 15 and hooks the upper thread 11.
[0039]
  As shown in FIG. 9A, in a state where the hook portion 60a hooks the upper thread 11, the threading shaft drive member 54 moves downward to a predetermined position, and the cam portion 54b is the tip of the cam member 69. It contacts the cam portion 69a. When the thread cassette 10 is further pushed into the cassette mounting portion 5 from this state and the threading shaft driving member 54 moves downward, the threading shaft driving member 54 resists the biasing force of the torsion spring 67 by the tip cam portion 69a. Then, it is rotationally driven in the counterclockwise direction of FIG.
[0040]
  Then, the driving force transmitting portion 54a is separated from the horizontal surface of the protruding plate 59, so that the driving force for driving the threading shaft 50 downward is not transmitted to the threading slider 52. Accordingly, the threading shaft 50 rotates in the opposite direction and returns upward due to the urging force of the coil spring 58. Accordingly, the hook mechanism 53 also rotates in a direction away from the sewing needle 15, so that FIG. As shown, the threading hook 60 that hooks the upper thread 11 comes out of the eye hole 15a, and the threading operation is completed.
[0041]
  Next, the thread holding mechanism 17 will be described. As shown in FIGS. 3, 6, and 10 to 12, the yarn holding mechanism 17 includes a holding member 70 including a pair of yarn holding portions 71 and 72 that can hold the upper yarn 11 at a predetermined interval; The upper thread 11 can be released by the interlocking movement mechanism 73 that moves the pair of thread holding portions 71 and 72 to the vicinity of the eye 15a of the sewing needle 15 in conjunction with the mounting operation of the thread cassette 10 and the left thread holding portion 71. A thread clamping member 74 for clamping, a torsion spring 75 (biasing member) for elastically biasing the thread clamping member 74 toward the thread clamping side, and a cassette body 30 of the thread cassette 10 are attached to the thread cassette 10 in the mounting process. And a cam member 42 that temporarily swings the yarn clamping member 74 toward the clamping release side at a predetermined timing.
[0042]
  Further, the thread holding mechanism 17 includes a main body frame 76 fixed to the head 4 and a movable frame 77 that is guided and supported by the main body frame 76 so as to be movable up and down and to which the holding member 70 is fixed. And a movable frame 77 that is interlocked to be moved. The main body frame 76 includes a guide member 78 positioned on both right and left sides of the vertical swing path of the balance 13, and a pair of left and right guide plates 79a and 79b (on the right side of the guide member 78) for guiding the up and down movement of the movable frame 77. 3). The movable frame 77 is configured by connecting a pair of left and right movable plates 80a and 80b disposed between a pair of left and right guide plates 79a and 79b with a plurality of connecting pins.
[0043]
  First, the holding member 70 and the thread clamping member 74 will be described. As shown in FIG. 11, the pair of thread holding portions 71 and 72 of the holding member 70 are connected by a connecting member 81. The right end portion of the connecting member 81 extends horizontally to the right, and the connecting member 81 is fixed to the second wire 101 of the interlocking movement mechanism 73 via a holding member support 104 described later. The thread holding portions 71 and 72 are respectively formed with recesses 71a and 72a for hooking the upper thread 11 when the thread cassette 10 is mounted. A thread holding member 74 is pivotally attached to the left thread holding portion 71 by a pivot shaft 82, and a torsion spring 75 is attached to the pivot shaft 82.
[0044]
  A concave portion 74 a that clamps the upper thread 11 in cooperation with the left thread holding portion 71 is formed in the front portion of the lower end portion of the thread clamping member 74. A driven pin 84 that is operated by a cam member 42 to be described later is provided at the lower end side portion of the yarn clamping member 74. On the other hand, as shown in FIG. 11B, the upper end portion (the pivot shaft) of the yarn clamping member 74 is provided. On the side opposite to the driven pin 84 with respect to 82, a regulation pin 85 is provided for regulating the swinging of the thread clamping member 74 beyond the predetermined range to the thread clamping side. Here, the driven pin 84 is configured to protrude to the left, and the restriction pin 85 is configured to protrude to the right opposite to the driven pin 84.
[0045]
  Next, the interlocking movement mechanism 73 will be described. As shown in FIGS. 11 and 12, the interlocking movement mechanism 73 includes a cassette contact 90 made of a synthetic resin that comes into contact with the yarn cassette 10 and descends integrally with the yarn cassette 10 when the yarn cassette 10 is attached, and the cassette contact. First and second movable pulley mechanisms 91 and 92 for moving the holding member 70 by an amount four times the amount of movement of the body 90 are provided. The cassette contact body 90 is disposed so as to be vertically movable between a pair of left and right guide plates 79a and 79b of the main body frame 76, and the lower end portion of the yarn cassette 10 contacts the left end portion of the cassette contact body 90. The contact portion 90a is formed to protrude leftward from the left guide plate 79a.
[0046]
  The first moving pulley mechanism 91 includes a pulley 93 coupled so as to move up and down integrally with the cassette contact body 90, a first wire 94 wound around the pulley 93 and fixed at one end to the guide plate 79b, A pulley 95 or the like connected to the other end of the first wire 94 is provided. The pulley 93 is housed inside a synthetic resin pulley housing member 96, and the pulley housing member 96 is vertically moved integrally with the pulley 93 between the pair of guide plates 79 a and 79 b below the cassette contact body 90. It is arranged to be movable. A coil spring 97 is provided between the cassette contact body 90 and the pulley housing member 96 to urge the cassette contact body 90 upward with respect to the pulley 93. On the other hand, the pulley 93 (and the pulley housing member 96) is biased upward by a coil spring 98 for returning the movable frame 77 upward, and the lower end of the coil spring 98 is connected to the lower end of the left movable plate 80a. Has been.
[0047]
  One end of the first wire 94 is fixed to a portion of the guide plate 79b above the cassette contactor 90, and the other end of the first wire 94 is connected to a pin member 99 that connects the upper ends of the pair of left and right movable plates 80a and 80b. It is fixed. The pin member 99 is supported by a pair of left and right guide plates 79a and 79b so as to be movable up and down along the guide groove 100, and a pulley 95 is rotatably supported by the pin member 99. Therefore, the pulley 95 and the movable plates 80a and 80b (movable frame 77) can move up and down relatively with respect to the guide plates 79a and 79b (fixed frame 76) while the pin member 99 is guided in the guide groove 100. is there.
[0048]
  When the yarn cassette 10 comes into contact with the cassette contact body 90 and the cassette contact body 90 is pushed down when the yarn cassette 10 is mounted, the pulley 93 is also pushed down integrally with the cassette contact body 90. At this time, since the pulley 93 acts as a moving pulley, the pulley 95, that is, the movable frame 77 moves downward by an amount twice the moving amount of the cassette contact 90.
[0049]
  The second moving pulley mechanism 92 includes a second wire 101 having both ends fixed to the guide plate 79b, and two pulleys 102, 103 around which the second wire 101 is wound. The two pulleys 102 and 103 are rotatably supported at the lower end and the upper end of the pair of left and right movable plates 80a and 80b, respectively. One end of the second wire 101 is fixed to the upper end portion of the guide plate 79b. With the second wire 101 wound around the two pulleys 102 and 103, the other end of the second wire 101 is connected to the lower end portion of the guide plate 79b. It is fixed.
[0050]
  As shown in FIGS. 12 and 13, a synthetic resin holding member support 104 is fixed to a portion of the second wire 101 between the two pulleys 102 and 103. The connecting member 81 of the holding member 70 is connected. The holding member support 104 and the connecting member 81 are supported so as to be movable up and down along the guide groove 105 between a pair of left and right movable plates 80a and 80b.
[0051]
  When the pair of left and right movable plates 80a and 80b are moved downward by the first moving pulley mechanism 91, the two pulleys 102 and 103 are also moved downward along with the movement of the movable plates 80a and 80b. Here, the pulley 102 acts as a moving pulley. When a portion of the second wire 101 wound around the pulley 102 is pushed down by the pulley 102, the pulley 102 is moved by an amount twice as much as the movement amount of the pulley 102. The second wire 101 moves from the front side (right side in FIG. 12) to the rear side (left side in FIG. 12).
[0052]
  That is, the holding member 70 connected to the portion between the pulleys 102 and 103 of the second wire 101 also moves downward by an amount twice as much as the amount of movement of the pulley 102 (movable frame 77). That is, the movement amount of the holding member 70 is four times the movement amount of the yarn cassette 10.
[0053]
  Next, the cam member 42 will be described. As shown in FIGS. 4, 6, 7, and 10, the cam member 42 is integrated with the cassette body 30 so as to protrude forward from the front surface of the cassette body 30 at the right side portion of the rear end portion of the cassette body 30. Is formed. The cam member 42 includes a protruding portion 110 that protrudes forward from the front surface of the cassette body 30 and a cam forming portion 111 that extends rightward from the front end of the protruding portion 110. Between the cam forming portion 111 and the front surface of the yarn cassette 10, a pin passage 112 through which the driven pin 84 passes relative to the yarn cassette 10 when the yarn cassette 10 is mounted is formed.
[0054]
  A cam surface 111a on which the driven pin 84 relatively moves (slids) when the yarn cassette 10 is mounted is formed on the rear surface portion of the cam forming portion 111. The cam surface 111a is formed with an upper inclined surface that protrudes rearward as it goes downward. The lower inclined surface is continuous with the lower end of the upper inclined surface and projects downward toward the front. That is, the cam surface 111a facing the front surface of the yarn cassette 10 is formed to protrude rearward. The continuous portion of the upper inclined surface and the lower inclined surface is bent, and the cam surface 111a protrudes most rearward at the bent portion. Therefore, as the yarn cassette 10 moves downward, the driven pin 84 passes the pin passage 112 along the cam surface 111a, whereby the driven pin 84 is operated by the cam member 42, and the yarn clamping member 74 is moved. It will swing back and forth. At this time, the upper thread 11 is clamped between the thread holding portion 71 and the thread clamping member 74. The yarn holding operation of the yarn holding mechanism 17 will be described below mainly with reference to FIGS. 10 and 14 to 23, centering on the holding operation of the upper yarn 11 by the yarn holding portion 71 and the yarn holding member 74.
[0055]
  As shown in FIG. 14, in a state immediately after the yarn cassette 10 contacts the cassette contact body 90, the yarn clamping member 74 is urged toward the yarn clamping side by the torsion spring 75. From this state, as shown in FIG. 15, when the thread cassette 10 is pushed into the cassette mounting portion 5, the holding member 70 starts to move downward in conjunction with the mounting operation of the thread cassette 10. By the first and second movable pulley mechanisms 91 and 92, the moving amount of the holding member 70 is four times the moving amount of the yarn cassette 10, so the holding member 70 moves downward relative to the yarn cassette 10. It will be.
[0056]
  Then, as shown in FIG. 16, when the driven pin 84 reaches the inside of the pin passage 112 formed inside the cam member 42, the driven pin 84 is pressed rearward by the cam surface 111a, and accordingly the yarn is clamped. The member 74 starts to swing toward the clamping release side about the pivot shaft 82. Further, when the holding member 70 moves downward and the driven pin 84 reaches the most rearward projecting portion of the cam surface 111a as shown in FIG. 17, the thread clamping member 74 swings to the maximum clamping release side. At this time, the yarn portion 11c (see FIGS. 4 and 7) of the upper yarn 11 stretched on the front side of the yarn cassette 10 is located between the concave portion 71a of the yarn holding portion 71 and the concave portion 74a of the yarn clamping member 74. Will get into.
[0057]
  Further, when the driven pin 84 is relatively moved downward along the cam surface 111a and passes the most protruding portion of the cam surface 111a in the pin passage 112, the thread clamping member 74 is moved to the torsion spring 75 (FIG. 11B). ) And starts swinging toward the yarn clamping side. As shown in FIG. 18, when the driven pin 84 passes through the pin passage 112 and does not come into contact with the cam surface 111a, the upper thread is interposed between the concave portion 71a of the yarn holding portion 71 and the concave portion 74a of the yarn clamping member 74. 11 will be clamped. The restriction pin 85 is spaced upward from the recess 71 a of the thread holding portion 71 and the recess 74 a of the thread clamping member 74.
[0058]
  In the state where the upper thread 11 is clamped in this manner, the movable frame 77 further moves downward as shown in FIG. 19, and the upper thread 11 is located near the eye hole 15 a of the sewing needle 15 and the thread holding portion. 71 and 72 are held. At this time, as shown in FIG. 20, the hook mechanism 53 of the threading mechanism 16 described above rotates in the clockwise direction of FIG. 20, and the threading hook 60 passes through the eye hole 15a.
[0059]
  Here, when the holding member 70 moves to the vicinity of the eye hole 15a of the sewing needle 15, the cassette contact body 90 that has been pressed down in contact with the lower end portion of the thread cassette 10 is separated from the thread cassette 10, and the return coil spring is restored. The pulley 93 moves upward by the urging force of 98, and accordingly, the movable frame 77 and the holding member 70 start to move upward. At this time, the upper thread 11 held by the pair of thread holding portions 71 and 72 of the holding member 70 is hooked on the threading hook 60 and the threading hook 60 hooks the upper thread 11 as described above. When the hook mechanism 53 returns in the counterclockwise direction in FIG. 20, the upper thread 11 is passed through the eye hole 15a as shown in FIGS.
[0060]
  After the upper thread 11 is passed through the eye hole 15a, the holding member 70 moves upward together with the movable frame 77. When the above-described holding member 70 moves downward (see FIG. 18), FIG. As shown in the drawing, since the position where the connecting member 81 engages with the guide groove 105 is different, the driven pin 84 and the cam surface 111a of the cam member 42 are separated from each other, and the holding member 70 can be smoothly moved without interfering with each other. It will move back upward. Since the regulation pin 85 is on the right side of the thread clamping member 74 and is separated from the cam member 42 in the right direction, the regulation pin 85 does not hinder the vertical movement of the holding member 70.
[0061]
  Next, the yarn hooking mechanism 18 will be described. As shown in FIGS. 3 and 24 to 31, the yarn hooking mechanism 18 is attached to a horizontal plate-like base member 120 fixed to the lower portion of the head 4 and slidable below the base member 120. A movable member 121, a rotating arm 122 pivotally attached to the lower side of the movable member 121, and a hook member 123 pivotally attached to the lower side of the movable member 121 and having a thread hook 123a at the tip. The thread hook 123a can swing between a standby position (see FIGS. 24 and 28) where the upper thread 11 led out from the thread cassette 10 is not hooked and an operating position (see FIGS. 25 and 29) where the upper thread 11 can be threaded. A hook member 123 interlocked with the moving arm 122, and an operation force addition member 124 for applying an operation force for switching the hook member 123 between the standby position and the action position to the hook member 123 (FIG. 28). FIG. And irradiation), and an operation force transmission mechanism 125 for transmitting the operating force acting on the operating force applying member 124 to pivot arm 122 (see FIG. 28, FIG. 29).
[0062]
  The yarn hooking mechanism 18 includes a first swing that switches the hook member 123 from the standby position to the operating position by an operating force that acts on the operating force adding member 124 from the yarn cassette 10 in conjunction with the mounting operation of the yarn cassette 10. The hook member 123 and the rotating arm 122 switched to the operating position are slid together with the movable member 121 to slide the two first and second thread guides 19 and 20 and the first and second thread guides 19. , 20 after hooking the hook member 123 to the standby positionShakingIt is configured to perform the second swing to be moved.
[0063]
  Here, the standby position includes a first standby position (see FIGS. 24 and 28) close to the yarn guides 19 and 20 before the yarn cassette 10 is mounted, and a first standby position when the yarn cassette 10 is mounted. The two standby positions of the second standby position (see FIGS. 27 and 31) that are further away from the yarn guides 19 and 20 than the position are included.
[0064]
  The base member 120 is attached to a frame member 130 constituting a part of the thread tension mechanism 14 in a state where it is suspended downward by two support members 131 and 132 (see FIG. 28). A stopper member 133 is integrally formed in the middle of the left and right direction of the base member 120 in a downward projecting manner so as to receive and stop the rotating arm 122 that moves to the left when sliding.
[0065]
  The movable member 121 is composed of a substantially rectangular and horizontal plate member in plan view, and is attached to the base member 120 by two pin members 134 and 135 so as to be slidable in the left-right direction. The movable member 121 is formed with a guide groove 121a for engaging the two pin members 134 and 135 to guide the sliding movement with respect to the base member 120 so as to extend in the left-right direction.
[0066]
  That is, in the movable member 121, the state in which the left pin member 134 is at the left end position of the guide groove 121a (see FIG. 24) until the right pin member 135 reaches the right end of the guide groove 121a (see FIG. 27). The base member 120 is slidably movable by a predetermined distance. A slit 121b parallel to the guide groove 121a is formed on the rear side of the guide groove 121a, and the movable member 121 that elastically urges the movable member 121 to the right (threading start end position in FIG. 24) is formed in the slit 121b. The return coil spring 136 is mounted.
[0067]
  The base end portion of the pivot arm 122 is pivotally attached to the front portion of the right end portion of the movable member 121 via a pin 137 (see FIG. 28). The pivot arm 122 is connected to the counterclockwise of FIG. A torsion spring 138 (see FIG. 28) that elastically urges in a rotating direction (a direction in which the hook member 123 becomes the standby position) is mounted. An operation force input portion 122 a to which an operation force for switching the hook member 123 is input by the operation force transmission mechanism 125 is formed on the right side portion of the central portion of the rotating arm 122 in the front-rear direction. A contact portion 122b that contacts the stopper member 133 when the rotation arm 122 slides to the left integrally with the movable member 121 by a predetermined distance as described later is provided on the left side portion of the distal end portion of the rotation arm 122. It is formed in a horizontal protruding shape.
[0068]
  The proximal end portion of the hook member 123 is pivotally attached to the movable member 121 via a pin 139, and the distal end portion of the rotating arm 122 and the vicinity of the proximal end portion of the hook member 123 are interlocked and connected by an interlocking mechanism 140 described below. ing. Accordingly, the proximal end portion of the hook member 123 and the proximal end portion of the rotating arm 122 are both pivotally attached to the movable member 121, and the positional relationship between the proximal end portion of the hook member 123 and the proximal end portion of the rotating arm 122 is determined. It is kept constant.
The interlocking mechanism 140 is provided so as to protrude downward from a notch portion 122 c formed at the distal end portion of the rotating arm 122 and a rear portion of the pin 139 near the proximal end portion of the hook member 123. And a pin 141 that engages with the notch 122c.
[0069]
  In the state where the hook member 123 is in the first standby position shown in FIGS. 24 and 28, the thread hook 123a of the hook member 123 is separated from the upper thread 11. From this state, the hook member 123 is shown in FIGS. Thus, when the rotating arm 122 rotates around the pin 137 by a predetermined angle θ1 (for example, θ1 ≈20 °) in the clockwise direction of FIG. 25 against the urging force of the torsion spring 138, this rotation is performed. Accordingly, the notch 122c also rotates by the angle θ1. At this time, the pin 141 rotates around the pin 139 by the notch 122c.
[0070]
  Here, since the distance between the pin 137 and the pin 141 that is the rotation center of the rotation arm 122 is larger than the distance between the pins 139 and 141, the hook member 123 is swung in a horizontal state by the rotation of the pin 141. When the pin 141 is moved, the rotation of the pin 141 is expanded, and the thread hook 123a has a predetermined angle θ2 (for example, θ2) larger than the rotation angle of the rotation arm 122 in the clockwise direction of FIG. ≈90 °) swings in a horizontal state, the hook member 123 reaches the operating position shown in FIGS. 25 and 29, and the thread hook 123a engages with the upper thread 11. However, the hook member 123 is below the rotating arm 122 and the movable member 121, and a protruding portion (not shown) that protrudes upward is integrally formed on the hook member 123. The protrusion also rotates integrally. The movable member 121 partially protrudes on the rotation path of the protrusion, and when the hook member 123 rotates by a predetermined angle θ2, the protrusion of the hook member 123 and the protrusion of the movable member 121 ( The hook member 123 cannot be rotated any further.
[0071]
  As shown in FIGS. 28 to 31, the operating force adding member 124 is pivotally attached to the frame member 130 of the thread tension mechanism 14 so as to be swingable. A cassette contact portion 124a with which the lower end portion of the yarn cassette 10 contacts is provided at the front end side (right end side) portion of the operation force addition member 124 so as to protrude forward. When the yarn cassette 10 is attached, an operation force for switching the hook member 123 between the standby position and the operating position is transmitted from the yarn cassette 10 to the cassette contact portion 124a in conjunction with the attachment operation of the yarn cassette 10. The operating force adding member 124 swings in the clockwise direction of FIG.
[0072]
  The operating force transmission mechanism 125 includes a link member 145 pivotally attached to the lower end portion of the operating force addition member 124 so that the middle portion in the left-right direction can be pivoted, and a downwardly bent shape at the distal end portion (right end portion) of the link member 145. The formed distal arm 145a, a driven pin 146 provided at the base end (left end) of the link member 145, and a cam plate 147 having an arcuate cam groove 147a with which the driven pin 146 engages. I have.
[0073]
  The link member 145 extends in the left-right direction and is movably disposed in the left-right direction. An operation force is applied to the cassette contact portion 124a from the yarn cassette 10, and the operation force addition member 124 is rotated in the clockwise direction in FIG. When swaying, the link member 145 moves to the left along with the swaying. Here, as described above, the movable member 121 is biased to the right by the coil spring 136, and the pivot arm 122 is pivotally attached to the movable member 121.5The lower end of a is always in contact with the operating force input portion 122a of the rotating arm 122.
[0074]
  That is, the operating force is transmitted to the operating force input portion 122a of the rotating arm 122 via the link member 145 extending in the left-right direction, but the base end portion of the link member 145 is connected to the cam groove of the cam plate 147 via the driven pin 146. Therefore, when the lower end portion of the operation force addition member 124 moves in an arc shape, the driven pin 146 moves along the arc of the cam groove 147a substantially coincident with the arc, and the entire link member 145 is moved. It can move smoothly in the left-right direction. That is, the link member 145 does not rotate with a rotation center in a part of the link member 145. Therefore, the tip arm portion 145a presses the operation force input portion 122a of the turning arm 122 almost horizontally to the left, and sliding friction is generated between the tip arm portion 145a and the operation force input portion 122a. It can be suppressed as much as possible.
[0075]
  Next, the yarn hooking operation by the yarn hooking mechanism 18 will be described. In the state before the thread cassette 10 is mounted, as shown in FIGS. 24 and 28, the hook member 123 is in the first standby position where the upper thread 11 is not hooked on the thread hook 123a. When the yarn cassette 10 is pushed into the cassette mounting portion 5 from this state, the cassette body of the yarn cassette 103The lower end of 0 comes into contact with the cassette contact portion 124a, and an operating force acts on the cassette contact portion 124a from the yarn cassette 10, and the cassette contact portion 124a swings in the clockwise direction of FIG.
[0076]
  At this time, when the operating force is transmitted from the operating force adding member 124 to the operating force input portion 122a of the rotating arm 122 via the distal arm portion 145a of the link member 145 by the operating force transmitting mechanism 125, the rotating arm 122 is transmitted. Is rotated by a predetermined angle θ1, and the first swing is performed to switch the hook member 123 from the standby position to the operating position.
[0077]
  That is, by the operation force input from the distal arm portion 145a to the operation force input portion 122a, the rotation arm 122 is rotationally driven by the predetermined angle θ1 about the pin 137 in the clockwise direction of FIG. The hook member 123 interlocked to the arm 122 is also swung in the clockwise direction of FIG. 24 about the pin 139 between the first thread guide 19 and the second thread guide 20 by the interlock mechanism 140. Then, as shown in FIG. 25, the thread hook 123a is rotated by a predetermined angle θ2 and switched to the operating position, and the thread hook 123a is engaged with the upper thread 11. Here, in order to ensure that the upper thread 11 is hooked on the thread hook 123a, the operating position of the hook member 123 shown in FIG. 25 is to the right of the first standby position shown in FIG. 24 (thread hooks 19a, 20a). In the opening direction). As the pivot arm 122 pivots, the contact portion 122b formed at the tip of the pivot arm 122 protrudes to the left.
[0078]
  When an operating force is further transmitted to the rotating arm 122 after the first swing, the rotating arm 122 is increased to a predetermined angle θ1 or more by the engagement between the protruding portion of the movable member 121 and the protruding portion of the hook member 123. Since it is regulated not to rotate, as shown in FIGS. 26 and 30, the hook member 123 and the rotating arm 122 switched to the operation position are resisted against the urging force of the coil spring 136 together with the movable member 121. The slide part moves a predetermined distance to the left until the contact part 122b contacts the stopper member 133. At the time of this sliding movement, the upper thread 11 engaged with the thread hook 123a is drawn to the left together with the hook member 123 and is moved to the thread hooks 19a and 20a of the first thread guide 19 and the second thread guide 20, respectively. The upper thread 11 is hung.
[0079]
  Here, as shown in FIGS. 24 to 27, the thread hooking portions 19a and 20a of the two thread guides 19 and 20 open substantially to the right, and the hook member 123 is between these two thread guides 19 and 20. Moves between the standby position and the operating position. Therefore, by this sliding movement, the upper thread 11 engaged with the thread hook 123a is reliably hooked on the two thread guides 19 and 20. Furthermore, at this time, the upper thread 11 engaged with the thread hook 123a is moved from the opening end (right end) of the thread hooking portions 19a, 20a of the thread guides 19, 20 from the rear end (left end) side to the upper thread. 11 is reliably hung on the back ends of the yarn guides 19 and 20.
[0080]
  As shown in FIGS. 26 and 30, the contact portion 122 b is in contact with the stopper member 133, and the pin 141 is not allowed to move leftward (part of the rotating arm 122 with respect to the movable member 121). When the yarn cassette 10 is further pushed in and the operating force is input to the operating force input portion 122a in the temporarily stopped state), the hook member 123 is moved to the second standby position.ShakingA second swing is performed. That is, the movable member 121 moves to the left with respect to the base member 120 until the right pin member 135 engages with the right end of the guide groove 121a. Therefore, as shown in FIGS. The arm 122 rotates about the pin 141 in the counterclockwise direction of FIG. 27, and the interlock mechanism 140 swings the hook member 123 about the pin 141 as the center of rotation in the counterclockwise direction of FIG. The hook member 123 is switched to the second standby position.
[0081]
  As the rotating arm 122 rotates, the contact portion 122 b slides with respect to the stopper member 133. At this time, the upper thread 11 is disengaged from the thread hook 123a, the upper thread 11 is disengaged from the thread hook 123a, and the thread hooking operation to the thread guides 19 and 20 is completed. When the hook member 123 is switched to the second standby position, the thread hook 123a is further away from the needle bar 12 and the upper thread 11 than when the hook member 123 is switched to the first standby position. ing.
[0082]
  Next, a series of actions of the sewing machine M when the yarn cassette 10 is mounted will be described focusing on the above-described threading operation by the threading mechanism 16, the yarn holding operation by the yarn holding mechanism 17, and the yarn hooking operation by the yarn hooking mechanism 18. To do. When the yarn cassette 10 is inserted and pushed into the upper portion of the cassette mounting portion 5 from above, the lower end portion of the cassette body 30 pushes the cassette contact body 90 downward in the yarn holding mechanism 17 as shown in FIGS. Therefore, the holding member 70 is moved downward by the interlocking movement mechanism 73 in conjunction with the attaching operation of the yarn cassette 10. At this time, as shown in FIG. 16, when the driven pin 84 provided on the yarn clamping member 74 reaches the pin passage 112 inside the cam member 42 of the yarn cassette 10, the driven pin 84 moves along the cam surface 111a. Since the driven pin 84 is operated by the cam member 42, the yarn clamping member 74 starts to swing toward the clamping release side against the urging force of the torsion spring 75 around the pivot shaft 82. .
[0083]
  Further, when the holding member 70 moves downward and the driven pin 84 comes into contact with the most rearwardly projecting portion of the cam surface 111a as shown in FIG. 17, the thread clamping member 74 swings to the maximum clamping release side. At this time, the thread portion 11c (see FIGS. 4 and 7) of the upper thread 11 stretched on the front side of the thread cassette 10 enters between the left thread holding portion 71 and the thread clamping member 74. become.
[0084]
  Thereafter, as the driven pin 84 moves relatively downward along the cam surface 111a, the thread clamping member 74 is driven to swing toward the thread clamping side by the torsion spring 75, and the driven pin 84 comes out of the pin passage 112 and is cam surface 111a. When completely separated from the upper thread 11, the upper thread 11 is clamped between the thread holding portion 71 and the thread clamping member 74 as shown in FIG. In this state, the movable frame 77 and the holding member 70 move further downward along with the attaching operation of the yarn cassette 10, and the upper thread 11 is threaded into the eye holes of the sewing needle 15 by the pair of left and right thread holding portions 71 and 72 of the holding member 70. It is held near 15a.
[0085]
  At this time, the threading operation by the threading mechanism 16 is also performed simultaneously. That is, as shown in FIG. 8, when the threading shaft 50, the slider guide shaft 51, and the threading slider 52 move downward in conjunction with the mounting operation of the thread cassette 10, the threading shaft 50 moves downward by a predetermined distance. The threading shaft 50 is locked downward by the pin member 56b and the regulating member 12c, but the threading slider 52 further moves downward against the biasing force of the coil spring 58. That is, the threading slider 52 moves downward relative to the threading shaft 50, and the relative movement is converted into rotation of the threading shaft 50 by the pin member 56 a and the cam groove 52 a of the threading slider 52. The through shaft 50 rotates by a predetermined angle.
[0086]
  At this time, as shown in FIG. 20, the hook mechanism 53 provided at the lower end portion of the threading shaft 50 also rotates integrally with the threading shaft 50, and the hook portion 60 a of the threading hook 60 is moved to the sewing needle 15. Passes through the eye 15a. At this time, the holding member 70 of the yarn holding mechanism 17 starts to rise from the lowermost position, and the upper thread 11 held by the yarn holding portions 71 and 72 of the holding member 70 is caught by the hook portion 60a.
[0087]
  At this time, the cam portion 54 b of the threading shaft driving member 54 comes into contact with the tip cam portion 69 a of the cam member 69, and the threading shaft driving member 54 resists the biasing force of the torsion spring 67 and rotates counterclockwise in FIG. It is driven in the direction of Accordingly, since the driving force for driving the threading shaft 50 downward is not transmitted to the threading slider 52, the threading shaft 50 rotates in the reverse direction and returns upward due to the urging force of the coil spring 58. Since the hook mechanism 53 also rotates integrally with the threading shaft 50, as shown in FIG. 21, the hook member 123 that hooks the upper thread 11 comes out of the eye hole 15a, and the threading operation is completed.
[0088]
  In this way, when the upper thread 11 held by the thread holding mechanism 17 is passed through the eye hole 15a by the threading mechanism 16, and the thread cassette 10 is further pushed into the cassette mounting portion 5, the thread hooking mechanism 18 Thus, the upper thread 11 is hung on the two thread guides 19 and 20. That is, as shown in FIGS. 24 and 28, the yarn cassette 10 is pushed into the cassette mounting portion 5 from a state where the hook member 123 is in the first standby position where the upper thread 11 is not hung on the yarn hook 123a. Then, the lower end portion of the cassette body 30 comes into contact with the cassette contact portion 124a of the operation force addition member 124, and the operation force acts on the cassette contact portion 124a from the yarn cassette 10.
[0089]
  When the operating force applied to the operating force adding member 124 is transmitted to the operating force input unit 122a of the rotating arm 122 by the operating force transmission mechanism 125, first, the interlocking mechanism 140 is used, as shown in FIGS. As shown, a first swing is performed to switch the hook member 123 from the first standby position to the operating position, and the upper thread 11 engages with the thread hook 123a. Next, as shown in FIGS. 26 and 30, the hook member 123 switched to the operating position and the rotating arm 122 are slid to move together with the movable member 121, and the two thread guides 19 and 20 are hooked. The upper thread 11 is hung on the portions 19a and 20a. Further, as shown in FIGS. 27 and 31, after hooking the yarn guides 19 and 20, the hook member 123 is moved to the second standby position.ShakingThe second swing is performed, and the upper thread 11 is removed from the thread hook 123a, and the thread hooking operation is completed.
[0090]
  According to the sewing machine M described above, the following effects can be obtained.
[0091]
1) The yarn hooking mechanism 18 switches the hook member 123 between the standby position and the operating position by the operating force acting on the operating force adding member 124 from the yarn cassette 10 in conjunction with the mounting operation of the yarn cassette 10. Since the upper yarn 11 is hung on the one yarn guide 19, the yarn can be automatically hung on the first yarn guide 19 in conjunction with the attaching operation of the yarn cassette 10. Further, after the threading mechanism 16 is threaded into the eye hole 15a, the needle bar 12 is in a predetermined position close to the uppermost position, so that the first thread guide 19 is positioned close to the head 4 below. Although it is difficult for the operator himself to thread the first thread guide 19 during the threading operation and when the cloth is taken in and out, as described above, the first thread guide is interlocked with the mounting operation of the thread cassette 10. Since the upper thread 11 can be hung on 19, such a difficult operation can be omitted and the work efficiency can be improved. Further, when the upper thread 11 is hung on the first thread guide 19 by the yarn hooking mechanism 18, the upper thread 11 can be hung on the second thread guide 20 at the same time, and the upper thread 11 is hung on the second thread guide 20. You can save time and effort.
[0092]
2) Since the base end portion of the link member 145 is guided to the cam groove 147a of the cam plate 147 via the driven pin 146, the operation force acting on the operation force adding member 124 in conjunction with the mounting operation of the yarn cassette 10 Is transmitted to the operation force input portion 122a of the rotating arm 122 via the link member 145, the link member 145 can move horizontally and smoothly in the left-right direction. Therefore, the tip arm portion 145a can press the operation force input portion 122a of the rotating arm 122 almost horizontally to the right, and sliding friction is generated between the tip arm portion 145a and the operation force input portion 122a. It can be suppressed as much as possible. That is, the force for mounting the yarn cassette 10 can be small.
[0093]
3) The yarn hooking portions 19a and 20a of the first yarn guide 19 and the second yarn guide 20 open in substantially the same direction (rightward), respectively, and the operating position of the hook member 123 is higher than the standby position. Since the hook member 123 is positioned between the first yarn guide 19 and the second yarn guide 20 between the standby position and the operating position, the hook member 123 is positioned in the opening direction (rightward) of 20a. When the hook member 123 is in the standby position, the upper thread 11 is not hooked on the thread hook 123a. When the hook member 123 is switched to the operating position, the hook thread 123 is positioned in the opening direction of the thread hooks 19a, 20a. The upper thread 11 can be hung on the thread hook 123a.
[0094]
  Furthermore, since the hook member 123 moves between the standby position and the action position between the first thread guide 19 and the second thread guide 20, the upper thread 11 is hooked on the thread hook 123a. By moving the hook member 123 to the side opposite to the opening direction of the thread hooks 19a, 20a, the upper thread 11 enters the back end of the thread hooks 19a, 20a. The two-thread guides 19 and 20 can be hung.
[0095]
4) When the operating force is transmitted to the operating force input portion 122a of the rotating arm 122 via the operating force transmission mechanism 125, the upper thread 11 is engaged with the thread hook 123a by the first swing, and in this state The upper thread 11 engaged with the thread hook 123a by sliding movement is pulled toward the thread guides 19 and 20 to hook the upper thread 11 on the thread guides 19 and 20, and finally the thread hook 123a and the upper thread are moved by the second swing. 11 is released. That is, the upper thread 11 can be automatically and reliably hung on the thread guides 19 and 20 by the three-stage operation of the hook member 123. Further, during the sliding movement (second movement), the upper thread 11 engaged with the thread hook 123a is moved from the opening ends of the thread hook portions 19a, 20a of the thread guides 19, 20 from the back end side. Therefore, the upper thread 11 is reliably hung on the back ends of the thread guides 19 and 20.
[0096]
5) When the yarn cassette 10 is not attached to the cassette attaching portion 5, the hook member 123 is in the first standby position close to the first and second yarn guides 19 and 20, so that the yarn cassette 10 is attached. Then, since the hook member 123 is switched from the first standby position to the operating position, the yarn hooking operation to the yarn guides 19 and 20 can be started immediately. On the other hand, after the thread cassette 10 is completely installed, the hook member 123 is in the second standby position that is further away from the thread guides 19 and 20 than the first standby position, and the hook member 123 is separated from the needle bar 12. Thus, it is possible to prevent the upper thread 11 from being entangled with the hook member 123 during the sewing operation.
[0097]
6) The sewing machine M is configured such that the cassette mounting portion 5 is provided on the head 4 and the thread cassette 10 is inserted into the cassette mounting portion 5 from above the sewing machine M. The operator presses the thread cassette 10 with both hands. When wearing, both hands of the operator are located above the head 4. That is, both hands of the operator are considerably separated from the first and second thread guides 19 and 20 provided below the head 4. However, in the present embodiment, the upper thread 11 is also hung on the first and second thread guides 19 and 20 in conjunction with the mounting operation of the thread cassette 10. Therefore, it is not necessary to move the hand located at the first and second thread guides 19 and 20 below the head 4 and the sewing preparation work can be performed smoothly.
[0098]
  Next, modified embodiments in which various modifications are made to the embodiment will be described.
[0099]
1] The yarn supply source accommodated in the yarn cassette 10 can be of various forms such as a yarn piece or bobbin, or a simple yarn lump. In addition, the yarn cassette may be configured such that the yarn pieces and the lump of yarn that are the yarn supply source are exposed without being covered, and the yarn pieces and the lump of yarn are simply passed through the thread stand bar.
[0100]
2] In the embodiment described above, the operator himself pushes the thread cassette 10 into the cassette mounting portion 5 to mount the thread cassette 10, but the rubber roller (Japanese Patent Application No. 2002-2002 filed by the present applicant). 189517) or other driving means such as a motor, and the thread cassette 10 is automatically mounted, and the thread holding mechanism 17 and the thread hooking mechanism 18 are driven by this driving means. May be. Furthermore, if the two thread guides 19 and 20 are threaded, the thread holding mechanism 17 and the threading mechanism 18 may be driven by a manual operation lever.
[0101]
3] In the above-described embodiment, the first yarn guide 19 and the second yarn guide 20 have thread hook portions 19a and 20a that are open to the right and are horizontally formed, and the hook member 123 is substantially horizontal. The upper thread 11 is hung on the thread hook 123a by moving between the standby position and the action position, but the hook member 123a is moved obliquely downward 45 degrees from left to right. You may comprise as follows. On the contrary, the thread hooking portions 19a and 20a of the first thread guide 19 and the second thread guide 20 are formed so as to open to the right and extend upward in a direction of approximately 45 degrees, respectively. You may comprise so that it may move from left to right.
[0102]
4] The base member of the yarn hooking mechanism may be provided integrally with a sewing machine frame or a cover that covers the sewing machine frame. In this case, the movable member, the stopper member, and the coil spring are directly provided on the sewing machine frame or the cover that covers the sewing machine frame.
[0103]
【The invention's effect】
  According to the invention of claim 1, automatically in conjunction with the yarn cassette mounting operation.1st and 2ndSince the thread is hung on the thread guide, the operator himself / herself after threading the thread through the needle hole1st and 2ndThis saves the trouble of threading the thread guide and improves the working efficiency.
[0104]
  According to the invention of claim 2,Since the rotating arm and the hook member slide relative to the base member together with the movable member, the thread hooked on the thread hook is pulled into the first and second thread guides, and the first and second thread guides are securely attached. A thread is hung on. Further, since the second thread guide is located close to the sewing machine head to some extent, it is difficult for the operator himself to thread the second thread guide when preparing for sewing such as threading operation and cloth entry / exit. However, as described above, the second thread guide can be threaded in conjunction with the thread cassette mounting operation., Work efficiency can be improved.
[0105]
  According to the invention of claim 3,The tip arm presses the operating force input part of the rotating arm almost horizontally, suppresses the occurrence of sliding friction between the tip arm part and the operating force input part as much as possible, and performs the threading operation with a small operating force.be able to.
[0106]
  According to the invention of claim 4,In the state where the hook member is switched to the operating position by the first swing, the slide movement for threading the first and second thread guides is performed. Therefore, the first and second threads are hooked on the thread hook. The hook member is pulled toward the yarn guide side, and the first and second yarn guides can be reliably hooked. Further, the second swing enables the hook member to swing to the second standby position, and the thread can be removed from the thread hook. The work is smoothly performed without the trouble of removing the thread from the thread hook. Can doThe
[0107]
  According to the invention of claim 5,Since the thread is automatically hooked to the first and second thread guides by the operating force acting on the operating force adding member, the operator himself / herself puts the thread on the first and second thread guides after threading the needle through the needle holes. Saves time and effort and improves work efficiencyThe
[0108]
  According to the invention of claim 6,Since the sewing machine includes the yarn hooking device configured in the same manner as in the first aspect, the same effect as in the first aspect can be obtained.The
[0109]
  According to the invention of claim 7,Since the sewing machine includes the yarn hooking device configured in the same manner as in the fifth aspect, the same effect as in the fifth aspect can be obtained.The
[0110]
[0111]
[Brief description of the drawings]
FIG. 1 is a front view of a sewing machine according to an embodiment of the present invention.
FIG. 2 is a partially cutaway front view of the sewing machine.
FIG. 3 is an enlarged view of a main part of FIG. 1;
FIG. 4 is a front view of the yarn cassette.
FIG. 5 is a left side view of the yarn cassette.
FIG. 6 is a right side view of the yarn cassette.
FIG. 7 is a bottom view of the yarn cassette.
8A and 8B are configuration diagrams of a threading mechanism, where FIG. 8A is a left side view and FIG. 8B is a front view.
FIGS. 9A and 9B are perspective views showing an operating state of the hook mechanism, where FIG. 9A shows a state immediately before threading, and FIG. 9B shows a state where threading is completed.
FIG. 10 is a side view of the main part of the head after completion of the threading operation.
11A and 11B are diagrams showing a holding member and a movable frame, in which FIG. 11A is a left side view, FIG. 11B is a front view, and FIG. 11C is a right side view.
FIG. 12 is a side view of the holding member and the interlocking movement mechanism.
13A and 13B are side views of the holding member support, wherein FIG. 13A is a left side view, and FIG. 13B is a right side view.
FIG. 14 is a diagram illustrating an operation state of the holding member and the yarn clamping member (immediately before the holding member is moved).
FIG. 15 is a diagram illustrating an operation state of the holding member and the thread clamping member (immediately after the start of movement of the holding member).
FIG. 16 is a diagram illustrating an operation state of the holding member and the thread clamping member (at the time of starting the swinging of the thread clamping member).
FIG. 17 is a diagram illustrating an operation state of the holding member and the yarn clamping member (maximum swinging state of the yarn clamping member).
FIG. 18 is a diagram illustrating an operation state of the holding member and the yarn clamping member (when the yarn clamping member swings).
FIG. 19 is a diagram illustrating an operation state (upper thread clamping state) of the holding member and the thread clamping member.
FIG. 20 is a partial plan view of the hook mechanism and the holding member during the threading operation.
FIG. 21 is a side view of FIG. 20 during the threading operation.
FIG. 22 is a side view of the main part of the head immediately after the threading operation.
FIG. 23 is a diagram illustrating an operation state (after the threading operation) of the holding member and the thread clamping member.
FIG. 24 is a bottom view of the yarn hooking mechanism (just before the yarn hooking operation).
FIG. 25 is a bottom view of the yarn hooking mechanism (after the first swing).
FIG. 26 is a bottom view of the yarn hooking mechanism (after sliding movement).
FIG. 27 is a bottom view of the yarn hooking mechanism (after the second swing).
28 is a front view of FIG. 24. FIG.
29 is a front view of FIG. 25. FIG.
30 is a front view of FIG. 26. FIG.
31 is a front view of FIG. 27. FIG.
[Explanation of symbols]
M sewing machine
4 heads
5 Cassette mounting part
10 Yarn cassette
11 Upper thread
15 Sewing needle
18 Yarn hanging mechanism
19 First thread guide
19a Thread hook
20 Second thread guide
20a Thread hook
121 Movable member
122 Rotating arm
122a Operating force input unit
123 Hook member
123a Thread hook
124 Operation force addition member
125 Operating force transmission mechanism
145 Link member
145a Tip arm
146 Follower pin
147 Cam plate
147a Cam groove

Claims (7)

A thread cassette that houses a thread supply source and is detachably mounted on a cassette mounting portion of the sewing machine, a first thread guide below the needle bar that supports the sewing needle, and the first thread guide that is provided near the lower end of the sewing machine head. A yarn hooking device to a thread guide of a sewing machine having a second thread guide separated from the thread guide by a predetermined distance ,
A hook member that has a thread hook, and is movable between a standby position where the thread drawn from the thread cassette is not hooked on the thread hook and an operating position where the thread is hooked;
An operation force addition member for adding an operation force for switching the hook member between the standby position and the action position;
The first yarn guide and the second yarn guide each have a yarn hooking portion for hooking the yarn, and each has a yarn hooking portion that opens in substantially the same direction. The operating position of the hook member is from the standby position. Is also positioned in the opening direction of the yarn hooking portion, and the hook member is moved by the operation force acting on the operation force adding member from the yarn cassette in conjunction with the attaching operation of the yarn cassette . A yarn hooking device for a yarn guide, characterized in that the yarn is hooked on the first yarn guide and the second yarn guide by switching between a standby position and an action position between the yarn guide and the yarn guide . . A base member fixed to a lower portion of the head of the sewing machine, a movable member attached to the base member so as to be slidable, and pivotally attached to the movable member and interlocked with the hook member so that the operation force is input. A rotating arm having an operating force input unit, and an operating force transmission mechanism for transmitting an operating force applied to the operating force adding member to the operating force input unit of the rotating arm. The yarn hooking device for the yarn guide according to 1. The operating force transmission mechanism includes a link member pivotally attached to the operating force adding member so that a middle portion thereof is pivotable, a distal end arm portion formed in a bent shape at the distal end portion of the link member, and the link The yarn guide device for a yarn guide according to claim 2 , comprising a driven pin provided at a base end portion of the member and a cam plate having an arcuate cam groove with which the driven pin is engaged. . When the yarn cassette is attached, the rotary arm is driven in a substantially horizontal direction by the tip arm while the lower end of the tip arm is in contact with the operation force input part of the rotary arm. A first swing for switching the hook member from the first standby position to the operating position, and the hook member and the rotating arm switched to the operating position are slid together with the movable member to move the first and second threads. The slide movement for hooking the thread on the guide and the second swing for swinging the hook member to the second standby position after the thread hooking are performed . Thread hooking device for thread guide. Yarn hooking on a thread guide of a sewing machine provided with a first thread guide below the needle bar for supporting the sewing needle and a second thread guide provided near the lower end of the head of the sewing machine and spaced from the first thread guide by a predetermined distance A device,
A hook member having a thread hook and movable between a standby position where the thread hook is not threaded and an operating position where the thread is hookable;
An operation force addition member for adding an operation force for switching the hook member between the standby position and the action position;
The first yarn guide and the second yarn guide each have a yarn hooking portion for hooking the yarn, and each has a yarn hooking portion that opens in substantially the same direction. The operating position of the hook member is from the standby position. The hook member is positioned between the first thread guide and the second thread guide by the operating force that is located in the opening direction of the thread hook and acts on the operating force adding member. yarn threading device to be that the thread guide, characterized by being configured so as to switch I subjecting the yarn to the first yarn guide and the second thread guide. A thread cassette that houses a thread supply source and is detachably mounted on a cassette mounting portion of the sewing machine, a first thread guide below the needle bar that supports the sewing needle, and the first thread guide that is provided near the lower end of the sewing machine head . a second thread guide a predetermined distance from the thread guide Te sewing odor with,
A threading device for threading the first thread guide and the second thread guide;
The threading device has a threading hook, a hook member movable between a standby position where the threading hook is not threaded and a working position where the threading is possible,
An operation force addition member for adding an operation force for switching the hook member between the standby position and the action position;
The first yarn guide and the second yarn guide each have a yarn hooking portion for hooking the yarn, and each has a yarn hooking portion that opens in substantially the same direction. The operating position of the hook member is from the standby position. Is also positioned in the opening direction of the yarn hooking portion, and the hook member is moved by the operation force acting on the operation force adding member from the yarn cassette in conjunction with the attaching operation of the yarn cassette . A sewing machine characterized in that the yarn hooking device is configured to switch between a yarn guide and a standby position and an operating position to hook the yarn on the first yarn guide and the second yarn guide. In a sewing machine comprising a first thread guide at the bottom of a needle bar for supporting a sewing needle and a second thread guide provided near the lower end of the sewing machine head and spaced apart from the first thread guide by a predetermined distance,
A threading device for threading the first thread guide and the second thread guide;
The threading device has a threading hook, and a hook member that is movable between a standby position where the threading hook is not threaded from the thread cassette and an operating position where the threading is possible.
An operation force addition member for adding an operation force for switching the hook member between the standby position and the action position;
The first yarn guide and the second yarn guide each have a yarn hooking portion for hooking the yarn, and each has a yarn hooking portion that opens in substantially the same direction. The operating position of the hook member is from the standby position. also located in the opening direction of the yarn hooking section, into a waiting position and an operating position between the hook member and the first thread guide and the second thread guide by the operation force acting on the operating force applying member A sewing machine characterized in that it is switched so as to hang the yarn on the first yarn guide and the second yarn guide .

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