JP2002336571A - Thread cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thread cassette imparting resistance to a thread. SOLUTION: The thread cassette 5 comprises a cassette body 40 and a closing member 41 serving as an upper cover and openably pinned to the cassette body. A thread 46 from a bobbin 45 is guided to a thread guiding part 49 and given resistance to passage and introduced into a hollow needle 9. The thread guiding part 49 is provided inside the closing member 41 and comprises a thread guide pin 47 and a clamping member 48 made of a plate spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread cassette accommodating a thread supply unit for sewing and a needle, and more particularly, to a thread cassette having an opening / closing member which is relatively movable with respect to the thread cassette. .

[0002]

2. Description of the Related Art Conventionally, a sewing device such as a sewing machine drives a sewing needle through which an upper thread is passed up and down, and sews a cloth with an upper thread and a lower thread by cooperation of the sewing needle, a thread catching mechanism and a balance mechanism. (See, for example, JP-A-63-171582). Recently, handy small and light sewing machines and sewing machines have been marketed, but in the near future sewing machines with embroidery functions that can be used by those with little knowledge of sewing machines, such as children, will become practical. It is assumed that Such a sewing device with an embroidery function is desirably a small and lightweight sewing device having a relatively simple structure such as sewing with a hollow needle using only an upper thread without using a lower thread. Is developing such a small and lightweight sewing device.

This sewing apparatus includes a sewing apparatus main body, a safety cover, an embroidery frame, a thread cassette provided with a sewing hollow needle and a thread spool, an embroidery frame driving mechanism provided in the sewing apparatus main body, and a detachable thread cassette. It is conceivable to provide a cassette drive mechanism that can be mounted and that reciprocates the yarn cassette up and down by a drive arm. The embroidery frame with the cloth attached is moved independently in the X and Y directions by the embroidery frame drive mechanism, the thread cassette is moved up and down by the cassette drive mechanism, and only the upper thread supplied from the hollow needle is moved by the vertical movement of the hollow needle. Embroidery may be performed on the cloth.

The thread cassette has a cassette body for accommodating needles and thread spools, and an opening / closing cover member pin-connected to the cassette body, holds the opening / closing cover member at a predetermined position during sewing, and holds the cassette body. It is conceivable to sew while pulling out the thread from the thread spool by vertically swinging the drive arm.

[0005] In order to stably supply the yarn from the thread spool to the hollow needle, a thread guide is required. In addition, since the embroidery sewing is performed using only the upper thread without using the lower thread, the needle is sewn. It is considered that it is necessary to impart an appropriate resistance to the yarn supplied to the hollow needle at the time of dropping (during sewing operation), and it is necessary to impart little resistance to the yarn when the needle is raised.

[0006]

In the above-described thread cassette of the sewing apparatus, when the thread guide and the resistance applying section for applying resistance to the thread are separately provided, the number of parts increases and the structure becomes complicated. However, the space for arranging them may be insufficient.

In addition, when the structure of the yarn guiding portion and the resistance applying portion is complicated, the number of parts of the structure for attaching the leaf spring increases, and when the yarn comes off from the hollow needle, the leaf spring is removed. Since the thread is removed and threaded, and the thread is passed through the hollow needle, the threading operation becomes complicated, the magnitude of the resistance applied to the thread by the leaf spring is also easily changed, and the quality of the sewing product is also easily changed. It can be considered. SUMMARY OF THE INVENTION An object of the present invention is to provide a yarn cassette in which a yarn guiding function and a resistance applying function can be achieved by a common simple mechanism.

[0008]

A thread cassette according to claim 1 is a thread cassette containing a thread supply unit for sewing and a needle, and is detachably mounted on a drive arm of a sewing apparatus. In the thread cassette for sewing the workpiece by moving the thread cassette up and down, an opening / closing member that covers a part of the thread cassette so as to be able to open and close with respect to the cassette body is provided, and extends from the thread supply unit inside the opening / closing member. A yarn guide member for guiding a yarn, and a holding member for holding the yarn between the yarn guide member and the yarn guide member are provided.

The cassette main body is provided with a thread supply section and a needle, and a thread guide member and a holding member are provided inside the opening / closing member, and a thread extending from the thread supply section is held therebetween.
The yarn extending from the yarn supply unit is guided toward the needle, and the yarn guide member and the holding member impart an appropriate passage resistance to the yarn. Further, even if the thread cassette is removed from the drive arm and the opening / closing member is opened, the thread does not come off from the thread guiding member and the holding member because the thread guide member and the holding member are provided in the opening / closing member.

According to a second aspect of the present invention, in the first aspect of the present invention, one end of the opening / closing member is rotatably connected to one end of the cassette body of the thread cassette, and moves the cassette body up and down during sewing. At the same time, the opening and closing member is relatively opened and closed with respect to the cassette main body, and the yarn is fed from the yarn supply unit via the yarn holding by the yarn guiding member and the holding member.

At the time of sewing, the opening and closing member is held at a predetermined position,
The cassette body is sewn on the cloth by reciprocatingly driving the cassette body up and down by a drive arm. When the cassette body swings downward, the thread is pulled out from the thread supply unit, and sewing is performed while imparting passage resistance to the thread. When the cassette body swings upward, the thread on the downstream side of the thread guide member and the holding member is slackened, so that little tension acts on the thread on the stitch side.

The yarn cassette according to claim 3 is the first or second embodiment.
In the invention, the holding member is made of an elastic body. For this reason, the passage resistance can be imparted to the yarn via the elasticity of the holding member.

According to a fourth aspect of the present invention, in the yarn cassette of any of the first to third aspects, the holding member comprises a leaf spring. Since the holding member is made of a leaf spring, an elastic holding member having a simple structure can be obtained.

In the yarn cassette according to the fifth aspect, the first aspect is as follows.
In any one of the above inventions, the holding member includes a holding member configured to hold the yarn in cooperation with the holding member, and an opening / closing member including at least two opening / closing members that are separable from each other. The member and the holding component are provided in separate opening / closing components, respectively, and the opening / closing component provided with one of the holding member and the holding component,
The yarn cassette is configured to be separable from the yarn cassette body in which the yarn storage portion is formed.

Accordingly, when the opening / closing member provided with either the holding member or the holding member is separated from the yarn cassette body, the holding member and the yarn cassette body side on the separated side hold the holding member. The member and the holding component separate from each other, exposing the holding route of the yarn.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. The sewing apparatus according to the present embodiment is configured such that a ROM card is detachably attached to the sewing apparatus main body, and an embroidery pattern is applied to the cloth attached to the embroidery frame using the embroidery pattern data stored in the ROM card. . Note that the front, rear, left and right in FIG. As shown in FIG. 1, the sewing apparatus 1 includes a sewing apparatus main body 2, a safety cover 3, an embroidery frame 4 as a sewing object holder, a thread cassette 5, and the like.

First, the sewing apparatus main body 2 will be briefly described. As shown in FIGS. 1 to 3, the sewing device main body 2 is made of a synthetic resin material and is relatively small and has a bottomed cylindrical shape (for example, a diameter of about 22 cm and a height of 10 cm).
An embroidery frame driving mechanism 10 for attaching the embroidery frame 4 to which the cloth 7 is attached to the carriage 8 and moving the embroidery frame 4 in the horizontal direction with respect to the hollow needle 9 of the thread cassette 5,
The cassette drive mechanism 12 is detachably attached to the embroidery frame and driven to swing up and down, and a control device (not shown) for controlling the embroidery frame drive mechanism 10 and the cassette drive mechanism 12.
Since the sewing apparatus 1 sews only the yarn supplied from the yarn cassette 5 without using a lower thread, the cloth 7 to be sewn has a urethane elastic film sandwiched between a pair of woven cloths and a thread. Cloth with increased frictional resistance is used.

As shown in FIG. 2, the main part of the embroidery frame drive mechanism 10 and the cassette drive mechanism 12 and the control device are accommodated in the casing 6.
A carriage 8 on which the embroidery frame 4 is removably mounted; an X-direction drive mechanism 13 for driving the carriage 8 in the X direction (left-right direction) in a horizontal plane;
And a Y-direction drive mechanism 14 for driving the carriage 8 in the Y direction (front-back direction) orthogonal to the X direction on the horizontal plane.

The X-direction drive mechanism 13 includes the movable frame 1
5. A pulse motor 1 having guide rods 16 and 17, a screw shaft 18, a pulse motor 19, and a guide pin 20.
9, the screw shaft 18 is rotated, and the guide pin 20 is guided by the spiral groove to move left and right, so that the carriage 8 is driven to move in the X direction. Y direction drive mechanism 14
Has a support frame 21, a pair of guide rods 22, a screw shaft 23, a pulse motor 24, and a guide pin 25. The screw shaft 23 is rotated by the pulse motor 24, and the guide pin 25 is guided in the spiral groove. The carriage 8 is driven to move in the Y direction together with the movable frame 15 by moving back and forth.

As shown in FIGS. 2 and 3, the cassette drive mechanism 12 includes a drive arm 11 for detachably attaching the thread cassette 5,
A stationary frame 36 to which the drive arm 11 and the like are pivotally mounted; a sewing machine motor 26 as an AC motor as a drive source for swinging the drive arm 11 up and down; a gear mechanism 27 for reducing the rotation speed of the sewing machine motor 26; A cam mechanism (not shown) for converting the rotational motion decelerated by the above into a vertical swing motion of the drive arm 11 is provided.

The stationary frame 36 is attached to the sewing apparatus main body 2.
A vertical front view L-shaped frame fixed to the
An intermediate portion in the length direction of the drive arm 11 is pivotally attached to the stationary frame 36 by a pivot pin 11a. An engaging member 29 for holding the thread cassette 5 at the mounting position is pivotally attached to the drive arm 11, and the engaging member 29 is urged clockwise in FIG. 3 by a spring member. An operation member 30 for rotating the engaging member 29 counterclockwise to release the engagement is also pivotally attached to the stationary frame 36.

As will be described later, the thread cassette 5 has a cassette body 40 and an opening / closing member 41 as an upper cover.
The upper end of the left end of the opening / closing member 41 is rotatably connected to the upper end of the left end of the cassette body 40 by a pin member 42, and the opening / closing member 41 is relative to the cassette body 40 about the pin member 42. Can be opened and closed. A pin member 37 is fixed to the distal end (left end) of the drive arm 11,
At the lower end of the left end of the thread cassette 5, a laterally U-shaped engaging recess 43 that engages with the pin member 37 is formed.

With the thread cassette 5 tilted to the lower left, the thread cassette 5 is inserted obliquely from the upper right side to the lower left side into the cassette insertion slot 3a to engage the recess 43.
Is engaged with the pin member 37, and then the thread cassette 5 is pushed into the horizontal position, so that the engaging member 29 is also engaged, and the locking portion 5a at the lower end of the opening / closing member 41 of the thread cassette 5 is engaged with the stationary frame 36. It is locked from below by the stop pin 36a. The locking portion 5 a is a rib slightly protruding rearward in a straight line, and is formed obliquely along the lower end of the opening / closing member 41. When the drive arm 11 is reciprocally oscillated about the pivot pin 11a during sewing, the cassette body 40 of the thread cassette 5 is driven while reciprocatingly rotating about the pin member 42 with respect to the opening / closing member 41. Since the arm 11 is reciprocated up and down by the arm 11, embroidery sewing can be performed on the cloth 7 attached to the embroidery frame 4.

Next, the safety cover 3 will be described. As shown in FIGS. 1 to 3, the safety cover 3 is made of a transparent or translucent synthetic resin material, and is formed in the shape of a round bowl with the same diameter as the casing 6. A plurality of engaging claws are formed on the lower peripheral edge of the safety cover 3 so as to be able to engage with the casing 6 from above, and partially cover the moving area 28 of the embroidery frame 4. To cover the vertical movement region of the hollow needle 9 including the.

On the upper surface of the safety cover 3, a substantially rectangular cassette insertion opening 3 having a front-rear width slightly larger than the front-rear width of the yarn cassette 5 and slightly longer than the left-right length of the yarn cassette 5 is provided.
The stationary frame 36 and the drive arm 11 face the cassette insertion slot 3a. By inserting the thread cassette 5 into the safety cover 3 from the cassette insertion opening 3a, the drive arm 1 is guided while guiding the thread cassette 5.
1 can be attached. At the right end of the cassette insertion slot 3a, the operation member 30 is provided so as to slightly protrude upward. Start / stop switch 31
An operation window 3b formed through the safety cover 3 is formed in order to enable the operation.

The carriage 8 is driven by the embroidery frame drive mechanism 10.
The movable area 28 in which the rectangular embroidery frame 4 mounted on the embroidery frame 4 can be moved horizontally is a rectangular area approximately four times as large as the embroidery frame, as shown by the one-dot chain line in FIG. The hollow needle 9 of the thread cassette 5 mounted on the sewing apparatus main body 2 is located at a substantially central position of the moving area 28. As shown in FIGS. 1 to 3, on the outer peripheral portion of the safety cover 3, there is formed an arc-shaped slit 32 which allows the embroidery frame 4 to move, and is formed by a main slit 33 and an escape slit 34. Have been.

Next, the yarn cassette 5 will be described with reference to FIGS.
It will be described based on. As described above, the yarn cassette 5
It has a cassette main body 40 and an opening / closing member 41, and the opening / closing member 41 and the cassette main body 40 are rotatably connected by a pin member 42, and the pin member 42 has a screw for elastically urging the opening / closing member 41 to the closing side. A torsion spring 44 is provided. The opening / closing member 41 has a cover shape mainly composed of substantially trapezoidal front and rear walls on both front and rear sides, an upper wall, and a left side wall.

Inside the opening / closing member 41, a thread guide 49 for guiding a thread 46 supplied from a thread spool 45 as a thread supply section is provided. The thread guide 49 provides a passage resistance to the thread 46 with the thread 46 interposed between the thread guide pin 47 (corresponding to a thread guide member) made in the front-rear direction and the thread guide pin 47. And a holding member 48. The holding member 48 is formed of an elastic leaf spring.

A bent attachment portion 48a is formed at the base end of the holding member 48, and the attachment portion 48a is fixed to a plurality of ribs 63 and 64 inside the opening / closing member 41 by fitting. In this manner, the holding member 48 is attached in a cantilever manner, and the free end of the holding member 48 is elastically pressed against the upper surface of the thread guide pin 47 to clamp the thread 46 between the thread guide pin 47 and the thread 46. To provide an appropriate passage resistance.

During sewing of the embroidery, when the cassette body 40 rotates downward with respect to the opening / closing member 41, the thread 46
When the cassette body 40 is returned upward, the thread 4 between the thread guide 49 and the upper end of the hollow needle 9 is pulled out.
6 becomes loose. The thread guide 49 has a function of guiding the thread 46, a function of applying a necessary tension to the thread 46 to be sewn, and a function of preventing the thread 46 from flowing back to the thread spool 45.

As shown in FIG. 4 to FIG.
Reference numeral 0 denotes a thread spool accommodating portion 50 for accommodating the thread spool 45, a thread spool 45 accommodated in the thread spool accommodating portion 50, a leaf spring 51 for applying resistance to the thread spool 45, a hollow needle 9, and a hollow needle 9. Needle mounting part 52 for mounting, needle cover 53, guide part 56 for supporting needle cover 53 so as to be able to move up and down, compression coil spring 57 for elastically urging needle cover 53 downward, lock for locking opening / closing member 41 and needle cover 53 A mechanism and the like are provided.

The hollow needle 9 has a large-diameter portion at the upper end fixed to the needle mounting portion 52. The thread 46 extending from the thread spool 45 and bent at the thread guide 49 is introduced into the hollow needle 9 and extends outside the lower end of the hollow needle 9. The needle cover 53 has a cylindrical cover 54 that covers the lower end portion of the hollow needle 9, and a vertical rod portion 55 that extends upward from the cylindrical cover 54 integrally. It is guided to be able to go up and down. As shown in FIG. 5, the needle cover 53 is urged downward by the compression coil spring 57, and the regulated portion 55a of the rod portion 55 is locked at the upper end of the guide portion 56, so that the lower limit position shown in FIGS. It has become.

A lock mechanism for locking the opening / closing member 41 and the needle cover 53 will be described. As shown in FIGS.
This lock mechanism allows the opening / closing member 41 and the needle cover 53 to move, and a first position (lock position) for holding the opening / closing member 41 at the closed position and holding the needle cover 53 at the cover position (the position shown in FIG. 5). A lock member 58 movable to a second position (unlocked position);
8 for switching the position 8 from the first position to the second position
And a biasing member 60 for biasing the lock member 58 to be located at the first position.

A left end portion 58c of the lock member 58 is pivotally attached to the cassette main body 40 so as to be rotatable around an upright axis, and a locked portion 41a of the opening / closing member 41 is provided at an upper end portion of the lock member 58. A locking claw 58a for locking from above is formed, and a needle cover 53 is provided on the front arm of the locking member 58.
A locking portion 58b for locking the regulated portion 55a of the rod portion 55 from above is formed. Further, a switching member 59 facing the operation hole 61 formed in the rear wall portion 40a of the cassette body 40 is integrally formed at the right end of the lock member 58. The rear surface of the switching member 59 is formed with an inclined surface that is inclined so that the amount of projection toward the rear increases (the width in the front-back direction increases) toward the upper side. The biasing member 60 is constituted by a torsion spring made of an elastic body fitted to the spring support portion 62 of the cassette body 40. The biasing member 60 connects the lock member 58 and the switching member 59 to the cassette body 40. On the other hand, it is urged rearward (toward the first position).

FIGS. 6 and 7 show a state in which the lock member 58 is in the first position. When the lock member 58 is in the first position, the lock member 58 reaches its maximum position counterclockwise as shown in FIG. When the locking claw 58a of the lock member 58 abuts against the locked portion 41a of the opening and closing member 41 from above, the upward movement of the opening and closing member 41 is prohibited, and the locking of the locking member 58 is stopped. The portion 58b abuts on the locked portion 55a of the rod portion 55 of the needle cover 53 from above, thereby prohibiting the needle cover 53 from moving upward.

When the thread cassette 5 is mounted on the drive arm 11, the distal end of the pin-shaped (circular cross-section) locking portion 11 b (see FIG. 3) of the drive arm 11 protrudes into the operation hole 61. To push the switching member 59 forward, the locking member 58
Is switched to the second position (unlocked position), the opening / closing member 59 can move upward relative to the cassette main body 40, and the needle cover 53 can move upward relative to the cassette main body 40. Drive the yarn cassette 5 to the drive arm 1
1, the lock member 58 is switched to the first position by the urging force of the urging member 60, so that the locking member 11b of the drive arm 11 does not push the switching member 59. 53 is locked.

The operation of the sewing apparatus 1 described above will be described. When performing embroidery sewing on the cloth 7 attached to the embroidery frame 4, the embroidery frame 4 is mounted on the carriage 8, and the thread cassette 5 is inserted into the safety cover 3 from the cassette insertion slot 3a to drive the cassette drive mechanism 12. It is attached to the arm 11, the engagement concave portion 43 of the thread cassette 5 is engaged with the pin member 37, and the locking portion 5 a at the lower end of the opening / closing member 41 of the thread cassette 5 is fixed from below by the locking pin 36 a of the stationary frame 36. Make it locked. Thereafter, the X-direction drive mechanism 13 and the Y-direction drive mechanism 14
, The cassette drive mechanism 12 is driven.

When the thread cassette 5 is not mounted on the drive arm 11, the lock member 58 urged by the urging member 60 is used.
Holds the first position and locks the opening / closing member 41 so that it cannot be moved up and down and locks the needle cover 53 so that it cannot be moved up and down. Therefore, the thread 46 is pulled back from the hollow needle 9 by opening and closing the opening and closing member 41. It can be reliably prevented from falling out. Further, since the needle cover 53 is also locked at the cover position, the distal end of the hollow needle 9 can be protected by the needle cover 53 to prevent damage, and the hollow needle 9 may injure a finger or the like. No, it is excellent in safety.

When the thread cassette 5 is mounted on the drive arm 11, the switching member 59 is pushed forward by the locking portion 11b of the drive arm 11 toward the unlocking side, and the lock member 5
8 is automatically switched to the unlocked position, so that embroidery sewing can be performed. At the time of sewing, the opening / closing member 41 of the thread cassette 5 is locked by the locking portion 36a of the stationary frame 36 to hold a predetermined position, and the cassette body 40 is vertically reciprocated by the drive arm 11 to be driven to reciprocate. But the cassette body 40
Is swung downward, the thread 46 is fed out from the thread spool 45 and supplied to the hollow needle 9.

At this time, an appropriate passage resistance is given to the thread 46 by the thread guide 49, so that an orderly embroidery stitch is formed. When the cassette body 40 rises, the thread 46 tends to be slightly slack between the thread guide 49 and the upper end of the hollow needle 9, so that little tension acts on the thread 46 on the embroidery stitch side. Even a stitch without a stitch will not be unwound.

A thread guide 49 comprising a thread guide pin 47 and a sandwiching member 48 formed of a leaf spring functions to guide the thread 46, to feed the thread 46 from the thread spool 45, and to prevent the thread 46 from flowing backward. Since it has a function, the number of parts is small and the structure is simple. In addition, if the yarn guide 49
Even if 6 comes off, the yarn can be easily hooked by elastically deforming the holding member 48 and holding the yarn 46. Since the elastic force of the holding member 46 can be kept constant,
The quality of the guided sewing product can be ensured.

In the yarn cassette 5, a yarn guiding portion 49 is configured so that the yarn holding member 48 and the yarn guiding pin 47, which is a holding member, cooperate to hold the yarn 46. Also,
At least two opening / closing components (a front side portion 41b, a rear side portion 41) that can be separated from each other by engagement claws (not shown).
c). The thread guide pin 47 and the thread holding member 48 are provided on separate opening / closing components (the front side 41b and the rear side 41c). A thread holding member 48 is provided on the front side 41b in a cantilevered state, and a thread guide pin 47 is provided on the rear side 41c in a cantilevered state.

Then, the opening / closing member 4 is attached to the yarn cassette body 40.
In a state where 1 (the front side 41b, the rear side 41c) is attached, the free ends of the thread guide pin 47 and the thread holding member 48 are arranged to be opposite to each other. Therefore, the front side portion 41 which is an opening / closing component provided with the thread holding member 48 is provided.
"b" is configured to be separable from the thread cassette main body 40 in which the thread piece storage section 50 as the thread storage section of the thread cassette 5 is formed.

Accordingly, as shown in FIG.
8 is separated from the rear side 41c of the yarn cassette body 40, the front side 4b on the separated side is separated.
The thread clamping member 48 of FIG. 1b and the thread guide pin 47, which is a clamping component on the thread cassette body 40 side, are separated from each other, exposing the thread clamping path. At this time, the free end of the thread guide pin 47 is exposed upward. In this state, the yarn 46 is hung on the yarn guide pin 47, and then the front side 41b provided with the yarn holding member 48 is attached to the rear side 41c of the yarn cassette body 40 again.

In this attachment, the free end of the thread holding member 48 is located below, and the thread 46 already hooked on the thread guide pin 47 is attached to the thread guide pin 47 with the attachment of the front side portion 41b. 48. In this way, the members that apply resistance to the yarn 46 are separated, and the yarn is easily hooked.

The above embodiment is merely an example of the present invention, and can be implemented in a form in which a partial change is added to the above embodiment. For example, various structures other than the yarn guide 49 inside the yarn cassette 5 can be adopted. The structure and shape of the holding member 48 of the thread guide 49 are not limited to those described above, and a lock member having various modifications may be employed.

[0047]

According to the first aspect of the present invention, a yarn guide member for guiding a yarn extending from the yarn supply unit and a holding member for holding the yarn between the yarn guide member are provided inside the opening / closing member. Therefore, the yarn extending from the yarn supply unit can be guided toward the needle by the yarn guide member and the holding member, and the yarn guide member and the holding member can impart an appropriate passage resistance to the yarn. As described above, the simple mechanism including the yarn guiding member and the holding member can exert the yarn guiding function and the resistance applying function. In addition, even if the cassette is removed from the drive arm and the opening / closing member is opened, the yarn does not come off from the yarn guiding member and the holding member because the yarn guiding member and the holding member are provided in the opening / closing member.

According to the second aspect of the present invention, one end of the opening / closing member is rotatably connected to one end of the cassette body of the thread cassette, and moves the cassette body up and down during sewing and opens / closes the cassette body. Since the members are relatively opened and closed, and the yarn is fed from the yarn supply unit via the yarn holding by the yarn guide member and the holding member, the yarn is supplied from the yarn supply unit when the cassette body swings downward. Sewing can be performed while giving passage resistance to the yarn while pulling it out.

When the cassette body swings upward, the thread is slackened downstream of the thread guide member and the holding member so that almost no tension acts on the thread on the seam side. be able to. Therefore, sewing can be performed using only the upper thread without using the lower thread. In addition, since the yarn guide member and the holding member hold the yarn with a simple structure, the passage resistance applied to the yarn is easily maintained at a constant level.
Stable sewing is possible, and the quality of sewing products can be ensured.

According to the third aspect of the present invention, since the holding member is made of an elastic body, it is possible to impart passage resistance to the yarn via the elasticity of the holding member. The other effects are the same as those of the first or second aspect. According to the yarn cassette of claim 4,
Since the holding member is made of a leaf spring, an elastic holding member having a simple structure can be obtained. Other claims 1
3 has the same effect as any one of the above.

According to the yarn cassette of the fifth aspect, when the opening / closing member provided with one of the holding member and the holding member is separated from the yarn cassette body, the yarn holding path is exposed, so that the yarn cassette body is provided. The installation of the thread can be easily performed. Other effects similar to those of any one of the first to fourth aspects are exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sewing device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing various mechanisms inside the sewing device.

FIG. 3 is a front view showing a main part of the sewing apparatus in a cutaway manner.

FIG. 4 is a front view of the yarn cassette.

FIG. 5 is a rear view showing the internal structure of the yarn cassette with the rear wall removed.

6 is a schematic sectional view corresponding to a sectional view taken along line VI-VI of FIG. 4;

FIG. 7 is a partially cutaway cross-sectional view showing a lock mechanism and the like of the thread cassette.

FIG. 8 is a partially cutaway cross-sectional view showing a lock mechanism and the like of the thread cassette.

9A is a diagram illustrating an opening / closing member separated from a yarn cassette main body, and FIG. 9B is a diagram illustrating a state of the yarn cassette main body with a part of the opening / closing member separated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewing apparatus 5 Thread cassette 9 Hollow needle 11 Drive arm 11b Locking section 40 Cassette body 41 Opening / closing member 42 Pin member 45 Thread block (Thread supply section) 47 Thread guide pin (Thread guide member) 48 Holding member (Elastic body, plate) Spring) 49 Thread guide

Claims (5)

[Claims] 1. A thread cassette accommodating a thread supply unit for sewing and a needle, which is removably mounted on a drive arm of a sewing apparatus and is moved up and down by the drive arm to perform sewing on a workpiece. An opening / closing member for covering a part of the yarn cassette so as to be openable and closable with respect to the cassette body; a yarn guiding member for guiding a yarn extending from a yarn supply portion inside the opening / closing member; A yarn cassette, comprising a holding member for holding a yarn between members. 2. An end portion of the opening / closing member is rotatably connected to one end portion of a cassette main body of the thread cassette, and moves the cassette main body up and down during sewing and opens and closes the opening / closing member relatively to the cassette main body. The yarn cassette according to claim 1, wherein the yarn cassette is actuated to draw out the yarn from the yarn supply unit via the yarn holding by the yarn guiding member and the holding member. 3. The yarn cassette according to claim 1, wherein the holding member is made of an elastic body. 4. The thread cassette according to claim 1, wherein said holding member is made of a leaf spring. 5. A holding member for holding a yarn in cooperation with the holding member, and at least two opening / closing members constituting the opening / closing member and being separable from each other,
The holding member and the holding member are provided in separate opening / closing members, respectively, and the opening / closing member provided with one of the holding member and the holding member is formed by the yarn storage portion of the yarn cassette. The yarn cassette according to any one of claims 1 to 4, wherein the yarn cassette is configured to be separable from the set yarn cassette body.