JP3729409B2 - sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing machine, and more particularly, to a sewing machine configured to hold a yarn supply source at a predetermined position or to release the holding state by a driving force of a driving motor for adjusting the thread tension of the yarn. .
[0002]
[Prior art]
Conventionally, the sewing machine has been provided with various types of thread tension mechanisms that adjust the thread tension of the thread by changing the resistance applied to the thread. For example, in a sewing machine proposed by the present applicant and capable of detachably attaching a thread cassette having a thread spool to a cassette mounting portion of the sewing machine body, the thread tension mechanism has a pair of threads capable of holding an upper thread. A tension plate is provided, and when the presser foot lifting lever for raising and lowering the presser foot that presses the work cloth to be sewn is operated, a pair of thread tension plates are opened and closed in conjunction with the operation of the presser foot lifting lever. ing. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
JP2002-191886 (5th page, 11th page, 12th page, FIG. 39)
[0004]
[Problems to be solved by the invention]
In the above-described sewing machine, the thread cassette is not detachably held by the cassette mounting portion when the thread cassette is mounted to the cassette mounting portion. If the detaching operation has been performed, various parts related to sewing provided around the thread cassette and the cassette mounting portion may be damaged, and the stitches of the work cloth may be disturbed.
[0005]
Furthermore, if the thread cassette is removed from the cassette mounting part before the thread tension plate is opened due to the carelessness of the operator from the state where the thread cassette is mounted in the cassette mounting part, If the yarn is clamped by the thread tension means, the thread cassette is forcibly removed, and there is a possibility that the thread breaks and further, the parts constituting the thread tension mechanism and the like are damaged.
[0006]
An object of the present invention is to provide a mechanism for holding the yarn supply source in a predetermined position, and to simplify the structure of the sewing machine by sharing the driving means for driving the mechanism and the driving means for driving the thread tension means. In other words, the yarn tensioning means is configured to release the holding state of the yarn supply source after no resistance is applied to the yarn.
[0007]
[Means for Solving the Problems]
The sewing machine according to claim 1, wherein a thread supply source is disposed at a predetermined position with respect to a sewing machine body, and a holding mechanism that holds the thread supply source at the predetermined position with respect to the sewing machine body; A thread tension means for adjusting the thread tension of the thread drawn from the supply source; and at least one of holding the thread supply source at the predetermined position or releasing the holding of the thread supply source; and A drive motor for adjusting the thread tension of the thread drawn from the source, a first transmission means for transmitting the driving force of the drive motor to the holding mechanism, and a driving force of the drive motor to the thread tension means. And a second transmission means for transmitting.
[0008]
When the yarn supply source is arranged at a predetermined position of the sewing machine main body, the yarn supply source is held at the predetermined position by the holding mechanism, and the yarn tension of the yarn drawn from the yarn supply source is the yarn tension means. It is adjusted by. At this time, the driving force of the drive motor is transmitted to the holding mechanism via the first transmission means, and the yarn supply source is held at the predetermined position by the holding mechanism by the driving force, or the yarn supply The holding state of the source is released. On the other hand, the driving force of the drive motor is also transmitted to the thread tension means via the second transmission means, and the thread tension of the thread is adjusted by the thread tension means by the driving force.
[0009]
The sewing machine according to claim 2 is the sewing machine according to claim 1, wherein the holding mechanism is operated to release the state where the yarn supply source is held at the predetermined position with respect to the sewing machine body, and When the release operation means is operated, the driving force of the drive motor is transmitted to the holding mechanism by the first transmission means, and the holding state of the yarn supply source by the holding mechanism is released by this driving force. And control means for controlling the drive motor.
[0010]
When the release operation means is operated to release the state where the yarn supply source is held at the predetermined position by the holding mechanism, the control means causes the driving force of the drive motor to be applied to the holding mechanism by the first transmission means. The drive motor is controlled so as to release the holding state of the yarn supply source by the holding mechanism by this driving force.
[0011]
The sewing machine according to claim 3 is the sewing machine according to claim 1 or 2, wherein the holding mechanism holds the yarn supply source at the predetermined position of the sewing machine main body and the yarn supply source of the sewing machine main body. A holding member that is movable between a release position that is not held at the predetermined position, and wherein the thread tension means includes a thread tension tray that can clamp the thread drawn from the thread supply source; The transmission means is a switching member for switching the holding member between the holding position and the release position, and the second transmission means acts on the yarn in a state where the yarn is clamped by the thread tension plate. A cam surface for adjusting the clamping pressure, wherein the switching member and the cam surface are provided in one cam body.
[0012]
When the driving force of the drive motor is transmitted to the holding mechanism by the switching member as the first transmission means, the switching member switches the holding member from the release position to the holding position, and the yarn supply source is moved to a predetermined position on the sewing machine body. On the contrary, the holding member is switched from the holding position to the release position, and the holding state of the yarn supply source is released. On the other hand, when the driving force of the drive motor is transmitted to the thread tension means by the cam surface as the second transmission means, the thread tension of the thread drawn from the thread supply source is adjusted. Here, since the switching member and the cam surface are provided in one cam body, the driving force of the drive motor is transmitted to the holding mechanism and the thread tension means by driving the cam body with the drive motor.
[0013]
According to a fourth aspect of the present invention, there is provided the sewing machine according to the second aspect, wherein the holding mechanism holds the yarn supply source at the predetermined position of the sewing machine main body and the yarn supply source at the predetermined position of the sewing machine main body. A holding member that is movable between a release position that is not held at the position, and wherein the thread tension means has a thread tension plate that can clamp the thread drawn from the thread supply source, and the release operation means is operated The driving force of the driving motor is transmitted to the thread tension means by the second transmission means to drive the thread tension means so that the clamping force by the thread tension plate is reduced, and then the driving motor The driving force is transmitted to the holding mechanism by the first transmission means, and the holding member is moved from the holding position to the release position.
[0014]
When the release operation means is operated when releasing the state where the yarn supply source is held at a predetermined position of the sewing machine body by the holding mechanism, first, the driving force of the drive motor is fed to the thread tension means by the second transmission means. Thus, the thread tension means is driven so that the pinching force by the thread tension tray is reduced by this driving force, so that the resistance that prevents the movement of the thread is not applied to the thread. Next, the driving force of the drive motor is transmitted to the holding mechanism by the first transmission means, and the holding member moves from the holding position to the release position by this driving force, so that the holding state of the yarn supply source is released. The yarn supply source can be moved from a predetermined position of the sewing machine body.
[0015]
According to a fifth aspect of the present invention, the sewing machine according to any one of the first to fourth aspects includes a thread accommodating portion that is movable with respect to the sewing machine body, and the yarn supply source is accommodated in the yarn accommodating portion. . When the yarn supply unit is moved in a predetermined direction with respect to the sewing machine body in a state where the yarn supply source is stored in the yarn storage unit, the yarn supply source is arranged at a predetermined position of the sewing machine main body, and the holding mechanism The source is retained.
[0016]
A sewing machine according to a sixth aspect is the sewing machine according to the fifth aspect, wherein the thread accommodating portion is detachable from the sewing machine main body. Therefore, when replacing the yarn, the yarn accommodating portion having the yarn supply source is moved from a predetermined position of the sewing machine main body, and the yarn accommodating portion is removed from the sewing machine main body.
[0017]
A sewing machine according to a seventh aspect is the yarn cassette according to any one of the first to sixth aspects, wherein the yarn accommodating portion is detachably attached to a cassette attachment portion formed in the sewing machine body, and the holding member Is held at the holding position, the holding member is engaged with the yarn cassette, and when the holding member is located at the release position, the holding member is separated from the yarn cassette.
[0018]
Accordingly, when the yarn cassette is mounted on the cassette mounting portion, when the holding member is in the holding position, the holding member is engaged with the yarn cassette, and the holding member is held at a predetermined position of the sewing machine body. ing. On the other hand, when the holding member is located at the release position, the holding member is separated from the yarn cassette, and the holding state of the holding member at the predetermined position is released.
[0019]
A sewing machine according to claim 8 is the sewing machine according to any one of claims 5 to 7, wherein the thread accommodating portion is movable to a position protruding from the sewing machine main body, and the yarn accommodating portion protrudes from the sewing machine main body. An urging member for urging in the direction to be provided is provided. Therefore, when the state in which the yarn supply source housed in the yarn housing portion is held at the predetermined position of the sewing machine main body by the holding mechanism is released, the yarn housing portion protrudes from the sewing machine main body by the biasing force of the biasing member. Move to.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described. In the present embodiment, the present invention is applied to a home embroidery sewing machine that can sew various embroidery patterns on a cylindrical work cloth that forms a sleeve of clothing. Since the worker performs various operations from the left side to the right side in FIG. 1, the following description will be made assuming that the left side (front side as viewed from the operator) in FIG. 1 is the front.
[0021]
As shown in FIGS. 1 and 2, the embroidery sewing machine M includes a horizontal base portion 1, a pedestal portion 2 erected at the rear end portion of the base portion 1, and a horizontal direction forward from the pedestal portion 2. The cylinder bed 3 extends, and is supported by the upper end of the pedestal 2 so as to be switchable over a sewing position horizontally extending forward as indicated by a solid line in FIG. 2 and a retracted position retracted upward as indicated by a chain line in FIG. An arm portion 4 and a head portion 5 provided at the front end portion of the arm portion 4 are provided. The base portion 1, the pedestal portion 2, the cylinder bed 3, the arm portion 4, and the head portion 5 correspond to the sewing machine body in the present invention.
[0022]
In this embroidery sewing machine M, before the start of sewing, the operator sets a cylindrical work cloth on the cloth holding frame 34 that is fitted around the cylinder bed 3. Since the sewing needle 50, the threading mechanism 55, and the like may interfere with the work for setting the work cloth, the arm portion 4 is horizontal so that the worker can easily perform the work for setting the work cloth. The sewing position is switched to the upper retracted position. After the work cloth is set on the cloth holding frame 34 by the operator with the arm portion 4 in the retracted position, the arm portion 4 is switched to the sewing position again, and in this state, the embroidery sewing work is performed on the work cloth. .
[0023]
As shown in FIG. 2, the pedestal portion 2 has a main body frame 10, and the main body frame 10 has a sewing machine motor 11, and a sewing needle 50 provided on the head portion 5 with rotational driving force of the sewing machine motor 11. A main portion of the driving force transmission mechanism 12 that transmits to the balance 51 is provided. The driving force transmission mechanism 12 includes a main shaft 14, transmission shafts 13 and 15, belts 16, 17 and 18, gears 19 and 20, and the like. The rotational driving force of the sewing machine motor 11 is first transmitted via the belt 16. Then, it is transmitted to the shaft 13, then transmitted from the transmission shaft 13 to the main shaft 14 via the gears 19, 20, and the rotational driving force transmitted to the main shaft 14 is transmitted to the transmission shaft 15 via the belt 17. . A driving force is transmitted from the transmission shaft 15 to the sewing needle 50 and the balance 51 via the belt 18. A hand pulley 21 is also provided for the operator to manually rotate the main shaft 14 to move the sewing needle 50 up and down.
[0024]
As shown in FIGS. 1 and 2, the cylinder bed 3 is constituted by a cylindrical synthetic resin cover member 30 extending in the front-rear direction, and a needle plate 33 is attached to the upper end portion of the front end side portion of the cover member 30. For this purpose, a notch hole 30a is formed. Inside the cylinder bed 3, a vertical hook 31 and a hook shaft 32 that rotationally drives the outer hook of the vertical hook 31 are accommodated rotatably. A needle plate 33 is provided on the upper side of the vertical hook 31, and a needle hole through which the sewing needle 50 passes is formed in the needle plate 33, and when the sewing needle 50 descends through the needle hole of the needle plate 33, On the lower side, the upper thread 57 is hooked by the sword tip of the outer hook and the upper thread 57 and the lower thread are entangled, and a stitch is formed on the work cloth on the upper side of the needle plate 33. A rotary driving force of the sewing machine motor 11 is transmitted to the shuttle shaft 32 from the main shaft 14 via a gear (not shown), and the outer shuttle is driven to rotate by the rotational driving force.
[0025]
As shown in FIGS. 1 and 2, a cloth holding frame 34 for holding a work cloth is slidably fitted on the front half side portion of the cylinder bed 3. On the other hand, a movable body 35 that supports the cloth holding frame 34 is disposed in the rear half of the cylinder bed 3 so as to be movable in the front-rear direction with respect to the cylinder bed 3. A front / rear drive motor 36 that drives the movable body 35 in the front / rear direction is provided above the sewing machine motor 11 in the main body frame 10.
[0026]
As shown in FIG. 2, an annular drive ring 38 rotates around the rotation axis extending in the front-rear direction on the mounting plate 37 integrally provided at the front end of the movable body 35. A cloth holding frame 34 is integrally attached to the drive ring 38 at the front end of the drive ring 38. A rotation drive motor 39 for rotating the drive ring 38 is attached to the rear surface portion of the attachment plate portion 37.
[0027]
During sewing, when the movable body 35 is driven to move in the front-rear direction by a predetermined amount by the forward / backward movement drive motor 36, the cloth holding frame 34 supported by the movable body 35 via the drive ring 38 is also integrated with the movable body 35. When the drive ring 38 is moved in the front-rear direction and the drive ring 38 is rotated by a predetermined amount by the rotation drive motor 39, the cloth holding frame 34 also rotates integrally with the drive ring 38, and the work cloth held by the cloth holding frame 34 is moved. The embroidery pattern is applied to the work cloth by moving to a predetermined position.
[0028]
The rear end portion of the arm frame 40 of the arm portion 4 is externally fitted to a pair of left and right bearings 41 that rotatably support the transmission shaft 15 with respect to the main body frame 10. 2 can be rotated between a sewing position indicated by a solid line 2 and a retracted position indicated by a chain line in FIG. The arm cover 42 (see FIG. 1) that covers the arm portion 4 is formed with a protrusion 43 that protrudes substantially horizontally to the right, and a liquid crystal display 130 (see FIG. 10) is provided on the upper surface of the protrusion 43. On the upper surface of the liquid crystal display 130, there are various types such as a pattern selection key for selecting an embroidery pattern and a cassette discharge key 132 (see FIG. 10) for removing the thread cassette 60 from the cassette mounting portion 61. A touch panel 131 (see FIG. 10) including operation keys is also provided. Here, in order to make it easy for an operator in front to operate the touch panel 131, the protruding portion 43 is inclined slightly forward and obliquely downward.
[0029]
Next, the head unit 5 will be described. As shown in FIG. 2, the head unit 5 includes a sewing needle 50, a balance 51 supported by the arm frame 40 so as to be swingable back and forth, a needle vertical movement mechanism 52 for driving the sewing needle 50 up and down, and a work cloth from above. A presser foot 53 to be pressed, a thread tension mechanism 54 (thread tension means) for adjusting the thread tension of the upper thread 57, a threading mechanism 55 for passing the upper thread 57 through the eye hole 50a of the sewing needle 50, and the like are provided.
[0030]
Further, as shown in FIGS. 2 to 5, in the head portion 5, a cassette mounting portion 61 for detachably mounting a thread cassette 60 containing a thread spool 64 as a thread supply source, and a thread cassette 60 are cassettes. A thread cassette holding mechanism 62 (holding mechanism: see FIGS. 6 to 9) that holds the mounting portion 61 in a non-removable locked state is also provided. The thread cassette 60 is mounted on the cassette mounting portion 61 from the front, and the upper thread 57 is passed through the eye hole 50a of the sewing needle 50 by the threading mechanism 55 in conjunction with the mounting operation. Further, as will be described later, the upper thread 57 is stretched between the thread breakage detection body 75 and the thread holes 76a and 77a of the thread guide members 76 and 77, whereby the upper thread 57 is also applied to the balance 51 and the thread tension mechanism 54. It is designed to be hung. Here, a cassette detection switch 133 (see FIG. 10) for detecting the attachment state of the yarn cassette 60 is attached to the rear end portion of the yarn guiding member.
[0031]
The thread cassette holding mechanism 62 holds the thread cassette 60 in a locked state so that the thread cassette 60 does not come off from the cassette mounting portion 61. As will be described later, when the thread cassette 60 is released from this held state, The thread cassette holding mechanism 62 is unlocked by the thread tension motor 102 of the thread tension mechanism 54. Therefore, the thread cassette holding mechanism 62 will be described after the thread tension mechanism 54.
[0032]
First, the cassette mounting part 61 will be described. As shown in FIG. 3, a first engagement member 65 formed by bending the lower half portion into a substantially inverted U shape is fixed to the lower end portion of the left wall portion 40 a in the vicinity of the front end of the arm frame 40. A first engagement portion 65 a is formed at the lower end portion of the first engagement member 65. Further, a second engagement member 66 formed by bending the lower half portion into a substantially U shape is fixed to the lower end portion of the right wall portion 40 b of the arm frame 40, and the lower end portion of the second engagement member 66 is fixed to the lower end portion. A second engagement portion 66a is formed. Coil springs 67 and 68 for urging the yarn cassette 60 mounted on the cassette mounting portion 61 forward (in a direction protruding from the head portion 5) are provided on the rear portions of the first engagement member 65 and the second engagement member 66. (Biasing members) are provided. The right coil spring 68 urges the yarn cassette 60 forward via the pressing member 69.
[0033]
Next, the yarn cassette 60 that is detachably mounted on the cassette mounting portion 61 will be described. As shown in FIGS. 3 to 5, the yarn cassette 60 includes a synthetic resin cassette case 70 and a transparent synthetic resin cover member 71 that partially covers the upper side of the cassette case 70. . The cassette case 70 has a cylindrical thread spool storage section 72 that stores the thread spool 64, and a swing that is adjacent to the thread spool storage section 72 and that allows the swing 51 to swing back and forth in the front-rear direction. A passage 73 and a sewing operation chamber 74 for accommodating sewing parts such as the sewing needle 50 and the presser foot 53 and performing a sewing operation are formed adjacent to the swing passage 73.
[0034]
A thread breakage detection body 75 for detecting the thread breakage of the upper thread 57 is pivotally supported on the left end side on the rear side of the cassette case 70 in a rotatable manner. Further, at the rear end portion of the cassette case 70, a first thread guide member 76, a second thread guide member 77, a third thread guide member 78 for guiding the upper thread 57 led out from the yarn spool 64, the rear and upper side. A plate-like thread guide member 79 extending in the direction is provided, and a thread guide part 70 a made of a notch heading forward is formed on the right end side on the rear side of the cassette case 70. Furthermore, an upper thread holding member 80 that elastically holds the free end of the upper thread 57 is also provided on the right side of the front end of the cassette case 70.
[0035]
Here, the yarn path of the upper thread 57 extending from the yarn spool 64 will be described. As shown in FIGS. 4 and 5, the upper thread 57 fed out from the yarn spool 64 is first of all the guide shaft portion 75a of the yarn breakage detector 75, the thread hole 76a of the first thread guide member 76, and the second thread guide. The thread hole 77a of the member 77, the third thread guide member 78, the thread guide member 79, and the thread guide portion 70a are sequentially passed through, and finally held by the thread holding member 80.
[0036]
By the way, on the upper surface of the cover member 71, at a position to the right of the center position in the left-right direction, it extends in the front-rear direction; The part 81 is formed integrally with the cover member 71. Further, a second engaged portion 82 is formed on the right side portion of the cassette case 70 so as to protrude in the front-rear direction, that is, in the length direction of the arm portion 4. Therefore, the first engaged portion 81 can be engaged with the first engaging portion 65a, and the second engaged portion 82 can be engaged with the second engaging portion 66a. Further, the cover member 71 is formed with an engagement hole 71a that engages a holding member 110 described later. In a state where the holding member 110 is engaged with the engagement hole 71a, the yarn cassette 60 is in the cassette mounting portion 61. It is held in a non-removable locked state.
[0037]
Next, the needle vertical movement mechanism 52 and the presser foot 53 will be briefly described. The needle vertical movement mechanism 52 includes a needle holder 90 that holds the sewing needle 50, a guide shaft 91 that guides the vertical movement of the needle holder 90, a rotary plate 92 that is rotatably attached to the arm frame 40, and a rotary plate. 92 and a link member 93 that connects the needle holder 90 to each other. The guide groove 51a formed in the longitudinal direction of the balance 51 is engaged with a pin 93a at the upper end portion of the link member 93 connected to the needle clamp 90, and the link member 93 is rotated via the pin 93a. It is connected to the plate 92. Therefore, when the rotational driving force of the sewing machine motor 11 is transmitted from the transmission shaft 15 of the driving force transmission mechanism 12 to the rotating plate 92 via the belt 18 and the rotating plate 92 rotates, the link member 93 moves up and down to move the needle holder 90. The sewing needle 50 also moves up and down while being guided by the guide shaft 91, and at the same time, the balance 51 swings back and forth in conjunction with the vertical movement of the link member 93.
[0038]
The presser foot 53 is provided with a cutter (not shown) for cutting the upper thread 57. For example, when replacing the upper thread 57 at the time of color change, the cloth holding frame 34 is rotated by the rotation drive motor 39. While being moved, it is driven backward by the forward / backward movement drive motor 36 to move the upper thread 57 between the cloth holding frame 34 and the eye hole 50a of the sewing needle 50 to the cutter, and the upper thread 57 is cut by the cutter. .
[0039]
Next, the thread tension mechanism 54 will be described. As shown in FIGS. 6 to 8, the thread tension mechanism 54 has a thread tension mechanism for moving a pair of upper and lower thread tension plates 100 and 101 capable of holding the upper thread 57 and a sliding member 105a described later up and down. A motor 102 (drive motor) and a thread tension cam 103 (cam body) for determining the vertical position of the sliding member 105a by the rotation of the thread tension motor 102 are provided.
[0040]
A thread tension frame 104 is fixed to the left wall portion 40 a of the arm frame 40, and a pair of thread tension plates 100 and 101 are horizontally bent to the left at the lower end portion of the thread tension frame 104. The upper thread tension plate 100 is attached to a thread tension shaft 105 provided upright on the tray mounting portion 104a. The upper thread tension tray 100 is arranged to be movable up and down with respect to the lower thread tension plate 101. The lower thread tension plate 101 is fixed to a lower end portion of a thread tension shaft 105 extending upward. A sliding member 105a is fitted on the upper half of the thread tension shaft 105 so as to be slidable in the vertical direction. A coil spring 107 is provided on the thread tension shaft 105 between the thread tension plate 100 and the sliding member 105a. The exterior.
[0041]
The upper and lower ends of the coil spring 107 are in contact with the sliding member 105a and the thread tension plate 100, respectively, and the coil spring 107 is urged so that the elasticity of the coil spring 107 generates an urging force that closes the thread tension plates 100 and 101 to each other. is set up. The thread tension motor 102 is a stepping motor, and this thread tension motor 102 is attached to the right side portion of the upper half of the thread tension frame 104.
[0042]
The thread tension cam 103 is a disc-shaped member made of a synthetic resin. The thread tension cam 103 is freely rotatable by a pin 108 at a position slightly deviated forward and downward from the thread tension motor 102 in the thread tension frame 104. It is pivotally supported by. A gear portion 103 a is formed on the outer periphery of the thread tension cam 103, and the rotational driving force of the thread tension motor 102 is transmitted from the pinion 102 b connected to the output shaft 102 a of the thread tension motor 102 via the gear portion 103 a. Is transmitted to. A thread tension support member 106 is connected to the thread tension cam 103 by a pin member 109. As shown in FIG. 9, the pin member 109 is a groove formed in a spiral shape on the right side portion of the thread tension cam 103. 103b is engaged. A cam surface 103c is formed on the inner side surface portion of the groove 103b for adjusting the clamping pressure acting on the upper thread 57 in a state where the upper thread 57 is clamped by the thread tension plates 100 and 101. Note that the upper part of the sliding member 105 a is fixed to the horizontal surface of the lower part of the thread tension support member 106, and the thread tension support member 106 and the sliding member 105 a are integrated vertically with respect to the thread tension shaft 105. Move.
[0043]
When the thread tension cam 103 is rotationally driven by the rotational driving force of the thread tension motor 102, the pin member 109 moves in the vertical direction along the cam surface 103c, and the sliding member 105a integrally with the thread tension support member 106 is moved. Move up and down. Accordingly, the separation distance between the sliding member 105a and the upper thread tension plate 100 increases or decreases, and the compression amount of the coil spring 107 between the sliding member 105a and the thread tension plate 100, that is, the biasing force due to the elasticity of the coil spring 107 is increased. Also, the clamping pressure of the upper thread 57 between the pair of thread tension plates 100 and 101 is changed, and the thread tension of the upper thread 57 is adjusted. When the thread tension cam 103 is at a position (θ = 0 °) rotated to the maximum in the counterclockwise direction (−θ direction) in FIG. 9, the sliding member 105a reaches the lowest position, and the coil spring 107 is the most compressed state and the maximum elastic force is generated.
[0044]
On the other hand, the rotation angle θ of the thread tension cam 103 is a predetermined angle θ. ₁ (For example, θ ₁ = 282 °), the sliding member 105a reaches the uppermost position, the length of the coil spring 107 becomes a natural length (no load state), and the elasticity of the coil spring 107 is maintained even when the thread tension plates 100 and 101 are closed. No urging force is generated on the thread tension plates 100 and 101 due to. The rotation angle θ of the thread tension cam 103 is from 0 ° to θ ₁ In the state where the angle is between, the urging force due to the elasticity of the coil spring 107 is generated between the thread tension plates 100 and 101 according to the cam lift amount of the cam surface 103c, and the upper thread 57 is clamped and the upper thread 57 Resistance that prevents movement is acting.
[0045]
Next, the yarn cassette holding mechanism 62 will be described. The thread cassette holding mechanism 62 is separated from the thread cassette 60 shown by a solid line in FIG. 6 and is held away from the thread cassette 60 shown by a chain line in FIG. A holding member 110 that can move over a release position where the cassette 60 is not held by the cassette mounting portion 61, a torsion spring 111 that biases the holding member 110 to the holding position, and a holding member 110 that is released from the holding position. And a switching protrusion 112 (switching member). The step surface on the opposite side of the switching protrusion 112 that does not come into contact with the holding member 110 is the reference position of the thread tension cam 103 at the rotation angle θ of the above-described thread tension cam 103. In FIG. θ ₂ On the line.
[0046]
The holding member 110 is made of a synthetic resin-like rod-like member that extends vertically, and the holding member 110 penetrates the arm frame 40 and is arranged to be movable up and down. In the state where the holding member 110 is located at the holding position, the yarn cassette 60 mounted on the cassette mounting portion 61 is biased forward by the coil spring 139, and the vertical surface portion (rear side surface) of the lower end portion of the holding member 110 is the yarn. When the engaging hole 71a (see FIG. 4) of the cassette 60 is engaged with the vertical surface on the rear side of the inner wall, while the holding member 110 is located at the release position, the holding member 110 is separated from the yarn cassette 60. is there. The lower end portion of the holding member 110 has an inclined portion 110a for facilitating engagement of the holding member 110 with the engagement hole 71a of the yarn cassette 60 when the yarn cassette 60 is attached to the cassette attachment portion 61 from the front. It is formed so as to be inclined obliquely downward.
[0047]
In the arm frame 40, an arm member 113 that holds the holding member 110 in a vertical posture at the holding position is rotatably provided via a pivot shaft 114 at a portion in front of the holding member 110. The arm member 113 includes a first arm portion 113a that extends rearward and a second arm portion 113b that extends rearward and is shorter than the first arm portion 113a, like the first arm portion 113a, and the second arm portion 113b. The upper end portion of the holding member 110 is connected to this. A torsion spring 111 is externally mounted on the pivot shaft 114, and the arm member 113 is urged by the torsion spring 111 in the clockwise direction of FIG.
[0048]
As shown in FIG. 9, the switching protrusion 112 is provided integrally with the thread tension cam 103 so as to protrude rightward at a portion slightly inside the outer periphery of the thread tension cam 103. The thread tension cam 103 has the angle θ ₁ Is further rotated in the clockwise direction of FIG. ₂ (For example, θ ₂ = 285 °: state of FIG. 9), the switching protrusion 112 also rotates integrally with the thread tension cam 103, and the arm member 113 is pressed by the switching protrusion 112, so that the arm member 113 is in FIG. The holding member 110 starts to rise from the holding position at the same time. Further, the thread tension cam 103 is driven to rotate so that its rotation angle is θ _Three (For example, θ _Three = 315 °), the holding member 110 is completely removed from the engagement hole 71a of the yarn cassette 60 and switched to the release position, and the holding state of the yarn cassette 60 by the yarn cassette holding mechanism 62 is released. The yarn cassette 60 is pushed forward by a coil spring 67 provided on the first engaging member 65 and a coil spring 68 provided on the second engaging member 66 (see FIG. 4).
[0049]
Next, the control system of the embroidery sewing machine M will be described. As shown in FIG. 10, a control device 120 (control means) that controls the entire embroidery sewing machine M includes a microcomputer including a CPU 121, a ROM 122, and a RAM 123, and an input / output interface 124. The CPU 121, the ROM 122, and the RAM 123 are connected to an input / output interface 124 through a bus 125, and a flexible disk controller 126 (FDC) that drives a flexible disk drive 127 (FDD) is also connected to the bus 125.
[0050]
A flexible disk 128 (FD) storing embroidery data is inserted into the FDD 127, and the embroidery data is read from the FD 128 to the RAM 123 by the FDD 127. The input / output interface 124 is connected to a start / stop key 129, a touch panel 131, a cassette detection switch 133, and the like. The input / output interface 124 is also connected to the sewing machine motor 11, the forward / backward movement drive motor 36, the rotation drive motor 39, the thread tension motor 102, the liquid crystal display 130, and the like through a drive circuit (not shown).
[0051]
The ROM 122 stores various programs such as a thread cassette holding release program, which will be described later, for releasing the state in which the thread cassette 60 is held in the cassette mounting portion 61 by the thread cassette holding mechanism 62, and a program related to embroidery sewing. ing. The RAM 123 stores embroidery data read from the FD 128 and the like.
[0052]
Next, thread cassette holding release processing for releasing the holding state of the yarn cassette 60 by the yarn cassette holding mechanism 62 when the yarn cassette 60 is removed will be described with reference to the flowcharts of FIGS. 6, 9, and 11. . In the following description, Si (i = 10, 11, 12,...) Indicates each step. This yarn cassette holding release process is executed by an interrupt process every predetermined control cycle.
[0053]
When the yarn cassette holding release process is started, first, the cassette detection switch 133 is turned on (S10: Yes), and the yarn cassette 60 is provided on the touch panel 131 in a state where the yarn cassette 60 is attached to the cassette attachment portion 61. When the cassette discharge key 132 is turned on (S11: Yes), the thread tension cam 103 is moved at an angle θ by the thread tension motor 102. ₁ (S12), the driving force of the thread tension motor 102 is transmitted to the thread tension mechanism 54 by the cam surface 103c of the thread tension cam 103, and the sliding member 105a is driven upward (open side). The clamping force by the tension plates 100 and 101 is minimized, so that the clamping pressure by the thread tension plates 100 and 101 hardly acts on the upper thread 57.
[0054]
Next, the thread tension cam 103 is moved at an angle θ by the thread tension motor 102. ₁ From angle θ _Three (S13), the driving force of the thread tension motor 102 is transmitted to the holding member 110 by the switching protrusion 112, and the holding member 110 is indicated by the chain line in FIG. 6 from the holding position indicated by the solid line in FIG. By switching to the release position, the holding state of the yarn cassette 60 is released.
[0055]
Next, the operation of the embroidery sewing machine M when attaching and detaching the thread cassette 60 will be described focusing on the thread tension mechanism 54 and the thread cassette holding mechanism 62. First, when the yarn cassette 60 is mounted on the cassette mounting portion 61 from the front by the operator, the upper surface portion of the yarn cassette 60 contacts the inclined portion 110a at the lower end portion of the holding member 110, and the holding member 110 moves rearward. Since the thread member 60 is once pushed up by the thread cassette 60 to be engaged and then lowered again by the biasing force of the torsion spring 111 at the position of the engagement hole 71a to engage with the engagement hole 71a, the holding member 110 is switched to the holding position. The cassette 60 is held in a locked state where it cannot be removed from the cassette mounting portion 61.
[0056]
In this state, when the operator operates the cassette discharge key 132 of the touch panel 131 to remove the thread cassette 60 from the cassette mounting portion 61, the thread cassette holding release process described above is performed. Here, as shown in S12 of FIG. 11, the thread tension cam 103 causes the thread tension cam 103 to rotate at an angle θ. ₁ 6 and 9, the sliding member 105 a is moved upward by the rotation of the thread tension motor 102 by the cam surface 103 c of the thread tension cam 103, so that the elasticity of the coil spring 107 is reached. Thus, the urging force against the thread tension plates 100 and 101 is completely eliminated. Accordingly, the resistance that prevents the movement of the upper thread 57 hardly acts.
[0057]
Further, as shown in S13 of FIG. 11, the thread tension cam 103 is rotated by an angle θ by the thread tension motor 102. _Three 6 is rotated integrally with the thread tension cam 103, the arm member 113 is pressed by the switching protrusion 112 and resists the urging force of the torsion spring 111. Since it rotates clockwise, the driving force of the thread tension motor 102 is transmitted to the holding member 110 by the switching protrusion 112, and the holding member 110 held by the arm member 113 is switched to the release position indicated by the chain line in FIG. . Then, the yarn cassette 60 is pushed forward by the urging forces of the two coil springs 67 and 68 provided on the left and right side portions of the cassette mounting portion 61 and moves to a position protruding forward from the head portion 5.
[0058]
According to the embroidery sewing machine M described above, the following effects can be obtained.
[0059]
1) The driving force of the thread tension motor 102 is transmitted to the thread cassette holding mechanism 62 and the thread tension mechanism 54 by the switching protrusion 112 provided on the thread tension cam 103 and the cam surface 103c, respectively. In order to operate both the cassette holding mechanism 62 and the thread tension mechanism 54, the thread tension motor 102 can also be used as a driving means for driving the thread cassette holding mechanism 62 and the thread tension mechanism 54, so one drive means is omitted. The configuration of the embroidery sewing machine M can be simplified, which is advantageous in terms of production cost.
[0060]
2) Both the switching protrusion 112 that transmits the driving force of the thread tension motor 102 to the thread cassette holding mechanism 62 and the cam surface 103c that transmits the driving force of the thread tension motor 102 to the thread tension mechanism 54 are provided to the thread tension cam 103. Since the thread tension cam 103 is rotationally driven by the thread tension motor 102, the driving force of the thread tension motor 102 can be transmitted to the thread cassette holding mechanism 62 and the thread tension mechanism 54, respectively. The configuration for transmitting the driving force of the thread tension motor 102 to the thread tension mechanism 54 can be simplified, which is advantageous in terms of manufacturing cost.
[0061]
3) When the cassette discharge key 132 is operated to release the state in which the yarn cassette 60 is held by the cassette mounting portion 61 by the yarn cassette holding mechanism 62, first, the sliding member 105a is moved upward (open side). In this state, the upper thread 57 is hardly given any resistance to prevent the movement, and then the holding member 110 is moved from the holding position to the release position to release the holding state of the thread cassette 60. When removing the thread cassette 60 from the cassette mounting portion 61, such as when replacing the thread spool 64, the clamping force by the thread tension plates 100 and 101 is minimized, and the thread cassette 60 can be moved smoothly.
[0062]
4) Since the yarn cassette 60 is biased forward by the coil springs 67 and 68 provided on the left and right sides of the cassette mounting portion 61, when the holding state of the yarn cassette 60 by the yarn cassette holding mechanism 62 is released, Since the yarn cassette 60 moves to a position protruding forward from the head portion 5 by the urging force of the coil springs 67 and 68, the yarn cassette 60 can be easily removed when the upper yarn 57 is replaced.
[0063]
Next, modified embodiments in which various modifications are made to the embodiment will be described. However, the same reference numerals are given to the same components as those in the above embodiment, and the description thereof is omitted as appropriate.
[0064]
1] Even when the cassette discharge key 132 is not operated by the operator, for example, when thread trimming data for instructing cutting of the upper thread 57 or thread replacement data for instructing color change is read from the embroidery data. Then, the thread tension motor 103 is rotationally driven by the thread tension motor 102 to drive the sliding member 105a so that the clamping force by the thread tension plates 100 and 101 is minimized, and then the holding member 110 is moved from the holding position to the release position. You may comprise so that it may switch.
[0065]
2] In the above embodiment, when the driving force of the thread tension motor 102 is transmitted to the thread cassette holding mechanism 62, the thread cassette holding mechanism 62 releases the holding state of the thread cassette 60 and maintains the released state. Conversely, when the driving force of the thread tension motor 102 is transmitted to the thread cassette holding mechanism 62, the thread cassette holding mechanism 62 holds the thread cassette 60 and maintains the held state. You may comprise. Alternatively, when the driving force of the thread tension motor 102 is transmitted to the thread cassette holding mechanism 62, the thread cassette holding mechanism 62 performs only an operation of switching the thread cassette 60 between the holding state and the released state where the thread cassette 60 is not held. In this way, the state switched by the yarn cassette holding mechanism 62 may be maintained by another mechanism.
[0066]
3] A yarn supply source such as the thread spool 64 is directly attached to a predetermined position of the sewing machine main body without using a yarn accommodating portion such as the yarn cassette 60, and is held at the predetermined position by the holding mechanism. May be. Further, even when the yarn piece 64 is arranged in the yarn cassette 60, it is not necessary to provide a wall portion surrounding the yarn piece 64 in the yarn cassette 60, and the yarn piece 64 may be exposed. Furthermore, the upper thread 57 does not need to be wound around the thread spool 64 and may be a lump of only the upper thread 57.
[0067]
4] As the thread tension means for adjusting the thread tension of the thread, in addition to the thread tension plates 100 and 101 of the above-described embodiment, the thread is fed by a pair of rollers, and the feeding amount is adjusted, Or, it is configured to adjust the rotational resistance of the rotating wheel by winding the thread around the rotating wheel, or configured to adjust the degree of bending by causing the thread to bend and generating resistance. Various configurations can be applied.
[0068]
5] In the above-described embodiment, even if the urging force due to the elasticity of the coil spring 107 against the thread tension trays 100 and 101 is not generated, the upper thread 57 has the thread tension tray 100 due to its own weight, such as the coil spring 107 and the thread tension tray 100. 101, a slight clamping force is applied, but the thread tension plate 100 is moved upward as it is separated from the upper thread 57 so that the clamping force does not act on the upper thread 57 from the thread tension plate 100, 101 at all. In addition, the thread tension mechanism 54 may be configured. In this configuration, the thread tension plate 100 may be moved up and down by the thread tension motor 102.
[0069]
6] In the above-described embodiment, the thread tension mechanism 54 is driven before the thread cassette 60 is taken out so that the clamping force by the thread tension trays 100 and 101 is minimized. Alternatively, the thread tension mechanism 54 may be driven so as to reduce the holding force, or may be driven so as to reduce the holding force by a predetermined amount.
[0070]
7] In the above-described embodiment, θ _Three The stroke in which the thread tension cam 103 is rotated is divided into S12 and S13 in FIG. 11, but may be a process for performing a collective rotation operation.
[0071]
8] In the above-described embodiment, the processes of S12 and S13 in FIG. 11 are continuously performed. However, a predetermined waiting time may be provided between the processes as necessary.
[0072]
9] In the above-described embodiment, the holding member 110 rotates together with the arm member 113, but when the arm member 113 rotates, the holding member 110 moves up and down on a straight line along with the rotation. It may be configured. With this configuration, the opening area of the engagement hole 71a on the upper surface of the yarn cassette 60 can be reduced.
[0073]
【The invention's effect】
According to the first aspect of the present invention, the driving force of the drive motor is transmitted to the holding mechanism and the thread tension means by the first transmission means and the second transmission means, respectively, and the holding motor and the thread tension means are transmitted by the drive motor. Since both can be operated, the structure of the sewing machine can be simplified, which is advantageous in terms of manufacturing cost.
[0074]
According to the invention of claim 2, when the release operation means is operated to release the state where the yarn supply source is held at the predetermined position by the holding mechanism, the driving force by the drive motor is transmitted to the first transmission. Since the holding state of the yarn supply source by the holding mechanism is released by the means and the holding mechanism is released, the releasing operation of the holding mechanism can be easily performed.
[0075]
According to the invention of claim 3, since the driving force of the drive motor can be transmitted to the holding mechanism and the thread tension means by the switching member and the cam surface provided in one cam body, respectively, the drive to the holding mechanism and the thread tension means is driven. The configuration for transmitting the driving force of the motor can be simplified, which is advantageous in terms of manufacturing cost.
[0076]
According to the invention of claim 4, when the release operation means is operated to release the state where the yarn supply source is held at the predetermined position by the holding mechanism, first, the clamping force by the thread tension plate is minimized. In order to release the holding state of the yarn supply source by moving the holding member from the holding position to the releasing position after the yarn tensioning means is driven so that the resistance that prevents the yarn from being applied is applied. When moving the thread supply source from a predetermined position of the sewing machine body, such as when replacing the thread supply source, the clamping force by the thread tension plate is minimized, and the thread supply source can be moved smoothly. it can.
[0077]
According to the fifth aspect of the present invention, the yarn supply source is accommodated in the yarn accommodating portion that is movable with respect to the sewing machine body. The release can be reliably performed, and an inadvertent movement of the yarn supply source can be prevented. In addition, the same effect as any one of claims 1 to 4 can be obtained.
[0078]
According to the sixth aspect of the present invention, since the yarn accommodating portion is detachable from the sewing machine main body, the yarn supplying source can be exchanged by removing the yarn accommodating portion from the sewing machine main body. In addition, the same effect as that of the fifth aspect can be obtained.
[0079]
According to the seventh aspect of the present invention, when the yarn cassette is mounted on the cassette mounting portion, the holding member engages with the yarn cassette when the holding member is in the holding position. It can be held in place on the body. On the other hand, since the holding member is separated from the yarn cassette when the holding member is located at the release position, the holding state of the holding member at the predetermined position is released.
[0080]
According to the eighth aspect of the present invention, since the yarn accommodating portion is urged by the urging member in the direction protruding from the sewing machine main body, the holding state of the yarn supply source accommodated in the yarn accommodating portion by the holding mechanism is released. Then, since the yarn accommodating portion moves to a position protruding from the sewing machine main body by the urging force of the urging member, it is easy to move the yarn accommodating portion with respect to the sewing machine main body when replacing the yarn supply source. Become.
[Brief description of the drawings]
FIG. 1 is a side view of an embroidery sewing machine according to an embodiment of the present invention.
FIG. 2 is a side view of an internal mechanism of the embroidery sewing machine.
FIG. 3 is a partial cross-sectional view of a head portion in a state where a yarn cassette is mounted.
FIG. 4 is a perspective view of a yarn cassette.
FIG. 5 is a plan view of the yarn cassette.
FIG. 6 is a partially enlarged side view of a head portion around a thread tension mechanism and a thread cassette lock mechanism.
7 is a front view of FIG. 6. FIG.
FIG. 8 is a plan view of FIG. 6;
9 is an enlarged view of the main part of FIG. 6 (θ ₂ State).
FIG. 10 is a block diagram of a control system of the embroidery sewing machine.
FIG. 11 is a flowchart of a thread cassette holding release process.
[Explanation of symbols]
M Embroidery sewing machine
54 Thread tension mechanism
57 Upper thread
60 yarn cassette
61 Cassette mounting part
62 Yarn cassette holding mechanism
64 Itokoma
67, 68 Coil spring
100, 101 thread tension plate
102 Thread tension motor
103 Thread tension cam
103b Cam surface
110 Holding member
112 Switching protrusion
120 controller
132 Cassette eject key

Claims (8)

In the sewing machine in which the thread supply source is disposed at a predetermined position with respect to the sewing machine body,
A holding mechanism for holding the yarn supply source in the predetermined position with respect to the sewing machine body;
Thread tension means for adjusting the thread tension of the thread drawn from the thread supply source;
A drive motor for performing at least one of holding the yarn supply source at the predetermined position or releasing the holding of the yarn supply source, and adjusting the tension of the yarn drawn from the yarn supply source;
First transmission means for transmitting the driving force of the drive motor to the holding mechanism;
Second transmission means for transmitting the driving force of the drive motor to the thread tension means;
A sewing machine characterized by comprising: Release operation means operated to release the state in which the holding mechanism holds the yarn supply source at the predetermined position with respect to the sewing machine body;
When the release operation means is operated, the driving force of the drive motor is transmitted to the holding mechanism by the first transmission means, and the holding state of the yarn supply source by the holding mechanism is released by this driving force. The sewing machine according to claim 1, further comprising control means for controlling the drive motor. The holding mechanism is movable between a holding position for holding the yarn supply source at the predetermined position of the sewing machine main body and a release position where the yarn supply source is not held at the predetermined position of the sewing machine main body. A holding member, wherein the thread tension means has a thread tension tray capable of sandwiching the thread drawn from the thread supply source,
The first transmission means is a switching member that switches the holding member between the holding position and the release position, and the second transmission means holds the yarn in the thread tension plate and holds the yarn. The sewing machine according to claim 1, wherein the switching member and the cam surface are provided on one cam body. The holding mechanism is movable between a holding position for holding the yarn supply source at the predetermined position of the sewing machine main body and a release position where the yarn supply source is not held at the predetermined position of the sewing machine main body. A holding member, wherein the thread tension means has a thread tension tray capable of sandwiching the thread drawn from the thread supply source,
When the release operation means is operated, the driving force of the drive motor is transmitted to the thread tension means by the second transmission means, and the thread tension means is driven so that the clamping force by the thread tension plate is reduced. 3. After that, the driving force of the drive motor is transmitted to the holding mechanism by a first transmission means, and the holding member is moved from the holding position to the release position. The described sewing machine. The sewing machine according to any one of claims 1 to 4, further comprising a yarn storage portion movable with respect to the sewing machine body, wherein the yarn supply source is stored in the yarn storage portion. The sewing machine according to claim 5, wherein the thread accommodating portion is detachable from the sewing machine body. The thread cassette is a thread cassette that is detachably mounted on a cassette mounting section formed on the sewing machine body, and the holding member is engaged with the thread cassette when the holding member is located at the holding position. The sewing machine according to claim 6, wherein the holding member is separated from the yarn cassette when the holding member is located at the release position. The urging member for urging the yarn accommodating portion in a direction protruding from the sewing machine main body is provided, wherein the yarn accommodating portion is movable to a position protruding from the sewing machine main body. The sewing machine according to any one of 5 to 7.

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