JP3392631B2 - sewing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine having a plurality of sewing needles attached to a needle bar and a plurality of thread catchers corresponding to the sewing needles, and more particularly to a sewing machine driven by a main shaft. The present invention relates to a miniaturized module for a thread catcher including a thread catcher other than the thread catcher and the driving means thereof.

[0002]

2. Description of the Related Art Conventionally, a sewing machine main body of a normal sewing machine is mainly composed of a bed portion, a pedestal portion, an arm portion, and a head portion, and a main shaft driven by a sewing machine motor is arranged in the arm portion. The needle bar, the sewing needle, and the balance of the section are driven up and down by the driving force of the main shaft. Further, a lower shaft and a thread wheel catching shuttle that cooperates with the sewing needle are arranged in the bed portion, and the lower shaft is also rotationally driven by the driving force from the main shaft. Since it is necessary to synchronously operate the sewing needle and the hook for catching the thread wheel, the lower shaft of the conventional sewing machine is also driven by the main shaft.

By the way, by driving the thread wheel catching hook with a dedicated drive motor independently of the sewing machine main shaft, the thread wheel catching hook is driven synchronously with the sewing machine main shaft, and the thread wheel catching hook is used in accordance with the sewing conditions. It is possible to precisely control the momentary rotation state of the shuttle. Therefore, for example, Japanese Patent Laid-Open No. 60-217
In Japanese Patent Publication No. 50, a needle drive motor for driving a sewing needle and a shuttle drive motor for driving a shuttle for catching a thread ring are provided, and a needle drive motor and a shuttle drive for driving the shuttle so that the sewing needle and the shuttle for catching the thread ring are operated in synchronization. A sewing machine has been proposed in which a motor is synchronously controlled and a series of stitches is a perfect stitch.

In Japanese Utility Model Laid-Open No. 61-158816, similarly to the sewing machine of the above-mentioned publication, a needle drive motor and a shuttle drive motor are provided for synchronous control to prevent stitch skipping,
A sewing machine has been proposed which is designed to improve the thread tightness of a seam. Japanese Unexamined Patent Publication No. 3-234291 discloses a rotary encoder for driving a sewing needle through a main shaft of a sewing machine motor and independently driving a thread wheel catching hook by a drive motor different from the sewing machine motor to detect the rotation amount of the main shaft of the sewing machine. A sewing machine has been proposed in which an interlocking control means is provided for rotating the drive motor by an amount corresponding to the rotation of the sewing machine main shaft by manual operation so that the interlocking relationship between the sewing needle and the thread catcher does not shift. There is.

In Japanese Patent Laid-Open No. 4-51991, in order to diversify the texture of embroidery, the needle bar drive mechanism, the balance drive mechanism, the cloth pressing drive mechanism, and the shuttle drive mechanism are independently driven. A multi-head embroidery sewing machine has been proposed. Then, as a kind of pattern stitching, the inventors of the present application use, for example, one end portion of a belt loop through which a belt of pants is passed.
In a two-needle sewing machine for sewing such that bartacking is performed simultaneously with a pair of sewing needles and a pair of thread wheel catching hooks, a first thread wheel catching hook (semi-finished hook provided on the main body of the bed of the sewing machine The rotary hook (rotary hook) is rotationally driven in conjunction with the sewing machine spindle, while the second rotary hook catching hook (semi-rotary rotary hook) facing the first rotary hook catching hook and the second rotary hook catching hook is driven. It was conceived that a unitized shuttle module including a drive motor is detachably mounted on the bed body so that the shuttle drive motor is synchronously controlled with the sewing machine motor.

By the way, in this hook module,
In order to make the size of the bed main body in the height direction as small as possible to improve workability, the drive shaft connected to the shuttle shaft for driving the second yarn wheel catching shuttle via the crank mechanism and the shuttle drive. The motor is installed side by side horizontally, and the timing belt is stretched between the pulley attached to the end of the drive shaft and the pulley attached to the motor shaft of the hook drive motor, and the rotation speed of the hook drive motor and the rotation speed of the drive shaft. The ratio of can be easily changed by changing the diameter of these pulleys.

[0007]

As conceived by the inventors of the present application, the second yarn wheel catching hook of the pair of first and second yarn wheel catching hooks and the hook drive motor are included. In the hook module which is unitized with the hook and is detachably attached to the bed main body, when the drive shaft connected to the hook shaft through the crank mechanism and the hook drive motor are horizontally arranged side by side, Although the size of the main body in the height direction can be reduced, a large storage space for horizontally arranging the drive shaft and the shuttle drive motor in parallel is required in the width direction of the shuttle module. Since the size increases and the width of the main body of the bed where this hook module is mounted also increases, the movement resistance when manually moving the trousers every time the bar loops are tacked and the trousers also increase. Sewing Will be held by gripping by hand away portion from the position, there is a problem that the mobile operability and sewing workability pants becomes worse.

An object of the present invention is to reduce the size of the bed portion in a sewing machine having a plurality of sewing needles and a plurality of thread ring catchers by modularizing a part of the thread catchers and a driving means for driving them. The purpose of the invention is to provide a sewing machine that can improve the workability of sewing work.

[0009]

According to another aspect of the present invention, there is provided a sewing machine having a plurality of sewing needles and a plurality of thread catchers corresponding to the sewing needles. Interlocking connecting means for interlocking and connecting the thread loop catcher of the sewing machine to the sewing machine main spindle, the remaining thread loop catcher of the plurality of thread loop catchers, and a driving means for driving these thread loop catchers independently of the sewing machine spindle. And a thread loop catcher module that is detachably fixed to the bed body of the sewing machine body, and the driving means of the thread loop catcher module is connected in series to the drive shaft that drives the thread catcher. It is arranged.

In the case of a two-needle sewing machine, in the case of a two-needle sewing machine, the thread catcher on the base end side (back side) of one bed portion is interlockingly connected to the sewing machine main shaft by the interlocking connecting means, and the remaining one sewing machine is used. A thread-loop catcher and a drive means for driving the thread-loop catcher independently of the sewing machine spindle are unitized as a thread-loop catcher module, and the driving means of the thread-loop catcher module drives the thread-loop catcher. Since the hook module is arranged in series with the shaft, the width of the hook module is reduced, and the width of the bed body of the sewing machine main body to which this hook module is attached is also reduced. The part can be grasped and held by hand, and the tubular sewn product such as pants can be easily moved, so that the workability of the sewing work can be improved.

According to a second aspect of the present invention, in the invention of the first aspect, the drive means is arranged so as to be located at a rear end portion of the thread catcher module and below the bed main body portion. Is. Explaining the operation, claim 1
However, since the driving means is disposed so as to be located at the rear end portion of the thread catcher module and below the bed main body, the driving means for the thread catcher module is It can be compactly stored under the bed body, the bed can be downsized, and the workability of the sewing work can be further improved.

A sewing machine according to a third aspect of the present invention is the sewing machine according to the first or second aspect of the present invention, in which the drive means and the drive shaft are coaxially connected via a coupling. Explaining the operation, the same operation as in claim 1 or claim 2 is achieved, but since the drive shaft is directly connected to the drive means through the coupling without using a gear mechanism or the like, the drive shaft is driven. Since the driving force of the device can be efficiently transmitted to the drive shaft and the drive shaft rotates once by one rotation of the drive motor of the drive device, the drive control of the thread catcher accompanied with the phase control can be simplified. .

The sewing machine according to claim 4 is a sewing machine according to claims 1 to 3.
In the invention of any one of 1 above, the thread catcher is a full rotary hook or a half rotary hook. The operation will be the same as that of any one of claims 1 to 3, but if the drive motor of the drive means is composed of a servomotor or a pulse motor, a full rotary hook or a half rotary hook will be easy. Can be driven and controlled.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 conceptually illustrates a two-needle sewing machine according to this embodiment. This two-needle sewing machine 1 is a sewing machine for simultaneously performing bartacking sewing on both ends of a belt loop of pants. As shown in FIG. 1, the sewing machine main body includes a bed portion 2, a pedestal portion 3 standing up from a base end portion on a rear end side thereof, an arm portion 4 and a head portion 5 horizontally extending forward from an upper end of the pedestal portion 3. Have. The main shaft 6 in the arm portion 4 is driven by a sewing machine motor 7 which is an AC servomotor, the needle bar 8 is driven up and down through a needle bar crank mechanism 9, and the needle support 10 at the lower end of the needle bar 8 is paired with a pair. Sewing needle 1
1a and 11b are attached, and the sewing needle 11b is attached so that the attachment position can be adjusted in the front-rear direction.

The bed portion 2 has a bed portion main body portion 12 and a shuttle module 13 which is arranged on the front end side of the bed portion main body portion 12 at a predetermined interval. Is provided with a semi-revolving shuttle 15 for catching, and a semi-revolving shuttle 16 for catching a yarn wheel is provided at the rear end of the shuttle module 13, and bobbin bobbins are installed in the respective semi-revolving shuttles 15, 16. There is. In order to drive the half-rotary hook 15 with the driving force of the main shaft 6, a lower shaft 17 is disposed inside the bed main body 12, and a crank rod 18 and a sector gear 19 connected to a crank 6a of the main shaft 6 are provided. The gear 20 at the right end of the lower shaft 17 is reciprocatingly driven via the, and the half-rotary hook 15 is driven in synchronization with the vertical movement of the needle bar 8 as in a normal sewing machine.

The hook module 13 has a half-turn hook 16 and a hook drive motor 21 for driving the half-turn hook 16 independently of the main shaft 6. The hook module 13 has a use position and
The position can be switched from the use position to a retracted position that is horizontally rotated by a predetermined angle and retracted,
Further, the hook interval is adjusted according to the change of the needle interval between the sewing needles 11a and 11b, or the sword tip of the half-turn hook 16 and the sewing needle 11b.
In order to adjust the positional relationship with
Is configured so that the front-rear position can be finely adjusted.
The detailed structure of the shuttle module 13 will be described later.

Next, the specific structure of the two-needle sewing machine 1 will be described with reference to the drawings starting from FIG. 2. The structure other than the structure related to the shuttle module 13, that is, the needle bar 8, the sewing needle 11a, 11b, its drive mechanism, the balance mechanism, the cloth feed mechanism for independently feeding and moving the work cloth (the cloth to be sewn) in the front-rear direction and the left-right direction are the same as those of the existing two-needle sewing machine, and will be briefly described. To do.

FIG. 2 shows a two-needle sewing machine 1 and a work table 22.
FIGS. 3 and 4 are right side views thereof. As shown in FIGS. 2 and 3, the work table 22 is equipped with the two-needle sewing machine 1 at the center, and the work table 22 has a lower side with A control device 140 and a manual operation unit 23 are provided, and an operation panel 26 having a liquid crystal display 24 and an operation unit 25 is erected on the right end of the work table 22. still,
The description of the supply unit 27 that supplies the belt loop continuum of the belt loop is omitted.

The cloth feeding mechanism 30 will be briefly described with reference to FIGS. As shown in FIGS. 4 to 6, the sewing needle 1
Cloth pressers 31a and 31b corresponding to 1a and 11b are provided, and the cloth presser 31a is supported by the elevating guide portion 32a at the front end of the support arm 32 via the L-shaped plate 33a, and the cloth presser 31b.
Is supported via a L-shaped plate 33b by a lift guide portion 32b at the front end of a movable support arm 32A that is slidably engaged with the support arm 32 in the front-rear direction. The movable support arm 32A includes two knob screws 34. It is fixed to the support arm 32 in a releasable manner. L-shaped plate 33 fixed to the presser foot 31a
a is vertically slidably mounted on the lifting guide 32a and is vertically driven by the air cylinder 35a, and the L-shaped plate 33b fixed to the presser foot 31b is vertically slidably mounted on the lifting guide 32b. It is driven up and down at 35b. The support arm 32 is fixed to the connecting member 37 of the XY feeding mechanism 36. The air cylinders 35a and 35b are drive-controlled by the control device 140.

The cloth receiving plate 38 extends to the lower side of the cloth pressers 31a and 31b, and holds the work cloth between the cloth pressers 31a and 31b to hold the work cloth in the X direction (left-right direction) and the Y direction (front-back direction).
The cloth receiving plate 38 is fixed to the feed actuation body 39 via the holding plate 38a, and the connecting member 37 is fixed to the feed actuation body 39. Therefore,
The cloth receiving plate 38 and the cloth pressers 31a and 31b are integrally fed and operated while holding the work cloth therebetween.

As shown in FIGS. 5 to 9, the XY feed mechanism 3
Regarding 6, the spiral cam shaft 42 is driven by the θ-axis motor 41 and the spiral cam shaft 44 is driven by the R-axis motor 43 in the case 40 of the bed base 12A which is the base end side of the bed main body 12. . The boss portion 45a at the center of rotation of the L-shaped swing arm 45 is integrally provided on the upper end portion of the support shaft 46, and the small wheel 45b of the swing arm 45 is engaged with the spiral cam shaft 42 to swing. A piece 45c at the front end of the moving arm 45 is engaged with an elongated engaging hole 39a of the feed actuating body 39 in the front-rear direction. The base end of the swing arm 47 is pivotally attached to the support shaft 48, and a small wheel 47a in the middle of the swing arm 47 is engaged with the spiral cam shaft 44, and the left end piece 47 of the swing arm 47 is engaged.
b is engaged with the elongated engaging hole 49a of the feed actuation body 49 in the left-right direction.

The feed actuating body 49 is slidably supported in the front-rear direction by the slide unit 49Y with respect to the base member 50, and the feed actuating body 39 is slidable in the left-right direction by the slide unit 39X with respect to the feed actuating body 49. It is movably supported. Therefore, by the R-axis servo motor 43,
Helical cam shaft 44, swing arm 47, and slide unit 4
9Y to drive the feed actuator 49 mainly in the front-back direction, and the θ-axis servomotor 41 mainly moves the feed actuator 39 via the spiral cam shaft 42, the swing arm 45, and the slide unit 39X. It can be fed and driven laterally. However, strictly speaking, the X-direction feed and the Y-direction feed are executed by both the motors 41 and 43. Therefore, the controller 14
By controlling the rotation direction and the rotation amount of both the motors 41 and 43 by 0, the feed amount in the X direction or −X direction and the feed amount in the Y direction or −Y direction can be precisely controlled. The cloth feed mechanism 30 described above is the same as the existing one.

Next, the shuttle module 13 (which corresponds to the thread catcher module) 13 will be described. First, the position switching mechanism 55 that switches the position of the shuttle module 13 will be described. As shown in FIG. 4, FIG. 7, and FIG. 10, the hook module 13 is formed in a block shape having a substantially rectangular parallelepiped outer shape, and the bed portion main body 12 and the hook module 1 are provided.
A rotating frame 57 is provided on the lower side of 3, and the shuttle module 13 is attached to the upper surface of the front portion of the rotating frame 57. A vertically oriented pivot shaft 58 that supports the rotating frame 57.
Is inserted into a pivot hole 57a of the rotating frame 57 and fitted into a hole 59 in the vicinity of the left end of the front end side portion of the bed main body portion 12, and the taper screw portion at the tip of the horizontally oriented bolt 60 is pivotally supported. The rotating frame 57 is fitted in the hole of the shaft 58, and the rotating frame 57 is mounted on the head 58a of the pivot shaft 58 through the bearing 61 having low friction.
It is supported by and is rotated horizontally around the pivot shaft 58 so that it can be switched between a use position shown by a solid line in FIG. 7 and a retracted position rotated by about 45 degrees as shown by a chain line. I am doing it.

A lock pin 62 for locking the hook module 13 in a use position is driven up and down by an air cylinder 63, and a tapered engagement portion 62a at the upper end of the lock pin 62.
When is engaged with the engaging hole of the boss portion 64 of the bed main body 12, it is locked in the use position. Rotating frame 57
A pair of left and right pressing members 65 are provided at the rear end portion, and these pressing members 65 are in contact with the lower surface of the bearing plate 66. When the shuttle module 13 is switched from the use position to the retracted position, the lock pin 62 is lowered by the air cylinder 63, and the shuttle module 13 is manually rotated horizontally toward the retracted position. While rotating on the lower surface of the plate 66, the rotating frame 57 is rotated around the pivot shaft 58 as a rotation center to be switched to the retracted position. In the present embodiment, the shuttle module 13 is manually moved to the retracted position, but the position may be automatically switched by a spring member, an air cylinder, or the like.

The proximity switch 68 for detecting the position of the lock pin 62 is turned off when the lock pin 62 is pulled out from the engaging hole.
The proximity switch 69 for detecting the position of the shuttle module 13 is turned on when the shuttle module 13 is switched to the use position. Detection signals of the switches 68 and 69 are supplied to the control device 140. When the hook module 13 is switched to the retracted position, the front of the half-turn hook 15 is opened and the rear of the half-turn hook 16 is opened, so that the bobbins in these half-turn hooks 15 and 16 can be replaced or entangled. The work of removing the thread and the upper thread can be performed easily and efficiently.

FIG. 10 is a plan view of a main part of the rotating frame 57 in a state where the shuttle module 13 is removed. The rotating frame 57 has three elongated holes 78 extending in the front-rear direction formed penetratingly. There are screw members 79 inserted into the slots 78 from below, respectively, and screwed into the lower end of the hook module 13. By fastening these screw members 79, the hook module 13 is fixed to the rotary frame 57, and As described above, the shuttle module 13 can be finely moved back and forth in a state where the screw members 79 are loosened, and by removing the screw members 79, the shuttle module 13 can be removed from the rotating frame 57.

Further, a shallow key groove 80 is formed on the upper surface of the rotating frame 57 in the front-rear direction, and a shallow key groove 81 facing the key groove 80 is formed in the front-rear direction on the lower end surface of the hook module 13. A common key member 82 (see FIG. 14) is attached to the key grooves 80 and 81, and is regulated so that the position of the shuttle module 13 in the left-right direction with respect to the rotating frame 57 is not displaced.

Next, various mechanisms inside the shuttle module 13 will be briefly described. As shown in FIGS. 11 to 16,
The shuttle module 13 includes a housing 90, a needle plate 91 attached to the upper end surface with a screw, a half-rotary shuttle 16, and a shuttle drive motor 21 that drives the half-rotary shuttle 16 via a drive force transmission system.
And a thread cutting mechanism 93 for cutting the lower thread and the upper thread, an oil supply mechanism 130 and the like. The half-turn hook 16 is arranged at the rear end near the upper end of the hook module 13, and the half-turn hook 16 has a driver 97 driven by a hook shaft 96 oriented in the front-rear direction and a sword tip 98a at the tip. An inner hook 98 that is reciprocally rocking driven by 97, and a bobbin case 99 inside the inner hook 98.
And the cauldron body 100 and the like.

In the housing 90, the shuttle shaft 96
The drive shaft 104 oriented in the front-rear direction is disposed on the lower side of the
The rear end of the drive shaft 104 is coaxially connected to the drive shaft 21a of the shuttle drive motor 21 attached to the rear end of the housing 90 via the coupling 105. That is, the drive shaft 1 that drives the half-turn hook 16 via the hook shaft 96.
04 and the shuttle drive motor 21 for driving the drive shaft 104.
Are directly connected to each other coaxially, and the shuttle drive motor 21 is arranged at the rear end portion of the shuttle module 13 and below the bed body 12. As a result, the width of the shuttle module 13 is reduced and the size of the shuttle module 13 is reduced, and accordingly, the bed portion is also reduced in size.

Then, in the middle of the drive shaft 104, a pair of connecting plates 106a, 106 separated by a predetermined distance.
b are fixed to face each other, and these connecting plates 106
A crank mechanism 106 is provided by connecting a and 106b, and a sector gear 108 is reciprocally oscillated around a support shaft 109 by a crank rod 107 connected to the crank mechanism 106 so that the sector gear 108 meshes with the sector gear 108. The member 110 and the shuttle shaft 96 are integrally reciprocally rotationally driven, and the driver 97 of the half-rotary shuttle 16 is reciprocally rotationally driven.

At the front end of the drive shaft 104, a manual operation knob 111 functioning as a flywheel for suppressing fluctuations in the rotation speed of the drive shaft 104 is mounted, and the manual operation knob 111 is always covered. It is covered with the member 112 from the front. However, the lower side of the cover member 112 has a hole on the drive shaft 104, and a driver or the like is inserted through the hole so that the drive shaft 104 can be operated to rotate. .

As shown in FIG. 13, the hook shaft 96 has its axial position set by fixing the collar 113 fitted onto the hook shaft 96 to the housing 90 with screws (not shown). In this state, by rotating an eccentric screw (not shown) facing this screw, the axial position of the shuttle shaft 96 can be finely adjusted. The sleeve body 114, which is externally fitted to the shuttle shaft 96 and fixed to the large shuttle body 100, is fixed to the housing 90 by a screw (not shown). In the loosened state, the eccentric screw ( (Not shown)
The axial position of the cauldron body 100 can be finely adjusted by rotating the.

Next, as shown in FIGS. 11 to 13 and 16, the thread cutting mechanism 93 includes a rear end of the movable blade drive lever 120 disposed in the front-rear direction in the vicinity of the lower side of the needle plate 91. Blade 1 that is connected to the needle portion and is rotatably supported by the needle plate 91.
21 and a fixed blade 123 installed on the lower surface of the throat plate 91,
The thread guide plate 122 on the lower side cooperates with the thread 124 (upper thread and lower thread) extending downward from the work cloth through the needle hole of the needle plate 91 and the guide hole 122a of the thread guide plate 122. It is to cut. A front end portion of the movable blade drive lever 120 is connected to a left end portion of a link plate 125 oriented in the left-right direction, and a right end portion of the link plate 125 is rotatably coupled to the housing 90 via an upright interlocking rod 126. Thread cutting is performed when the link plate 125 swings from the release position shown by the solid line in FIG. 11 to the operating position shown by the chain line and then returns to the release position again.

The link plate 125 is urged by a tension spring 94 at its left end toward the operating position. In order to execute thread cutting at a predetermined timing, the link plate 125 is reciprocally driven by the driving force of the drive shaft 104 to perform thread cutting. That is, the upper end of the interlocking rod 126 is fixed to the right end of the link plate 125. Interlocking rod 1
The lower end of 26 is fixed to the right end of the arm member 127 in the left-right direction, and the cam engaging wheel 127a in the middle of the left end of the arm member 127 is attached to the cam surface 128a of the cam body 128 of the drive shaft 104 from the rear side. Abutable.

A thread cutting air cylinder 129 for switching the link plate 125 between the release position and the operating position,
When the thread cutting air cylinder 129 is arranged adjacent to the drive shaft 104 on the immediate left side in the front-rear direction and does not perform thread cutting, the engaging member 1 at the tip of the rod 129a of the thread cutting air cylinder 129 driven to move back and forth.
29b pushes the engagement piece 127b attached to the left end of the arm member 127 rearward to hold the link plate 125 in the release position so that the cam engagement wheel 127a does not abut the cam surface 128a. Has become.

When the thread cutting air cylinder 129 is driven to advance at a predetermined thread cutting timing, the link plate 125 is switched to the operating position by the urging force of the tension spring 94, and the movement of the engaging piece 127b is permitted. The cam engagement wheel 127a comes into contact with the cam surface 128a from the rear side,
Interlocking rod 126 and link plate 1 according to the shape of 28a
25 is operated and thread cutting is executed. Immediately thereafter, the thread cutting air cylinder 129 is switched to the retract drive, and the link plate 125 is switched to the release position.

The thread cutting valve of the air supply system of the thread cutting air cylinder 129 is controlled by the controller 140. Even if the hook stops before the thread is cut for some reason, the thread cutting air cylinder 129 can switch the link plate 125 to the release position to complete the thread cutting. still,
A solenoid may be applied instead of the thread cutting air cylinder 129. Next, the oil supply mechanism 130 will be briefly described. As shown in FIG. 4, an oil pot 131 is provided at the front end of the rotating frame 57, and a plurality of wicks (not shown) extending from the oil pot 131. However, oil can be supplied to a plurality of sliding parts such as the drive shaft 104 and the shuttle shaft 96.

The operation of the two-needle sewing machine 1 described above will be described. The front half-rotating shuttle 16 of the two half-rotating shuttles 15 and 16, the shuttle driving motor 21 that drives the half-rotating shuttle 16 independently of the main shaft 6, and the driving force of the drive shaft 1
The transmission system etc. for transmitting to the shuttle shaft 96 via the crank mechanism 106 of 04 is unitized as the shuttle module 13, and the shuttle module 13 is detachably attached. Therefore, comparison is made when the half-rotation shuttle 16 is driven by the main shaft 6. Then, the structure of the drive system can be simplified, and the size and size can be simplified. Since the half-turn hook 15 closer to the pillar 3 of the sewing machine 1 is configured to be driven by the driving force of the main shaft 6, the half-turn hook 15 can be driven via a drive system having a relatively simple structure. Since the servomotor for the half-turn hook 15 can be omitted, it is advantageous in manufacturing cost.

Further, in the shuttle module 13, a half-rotation shuttle 16 driven by a shuttle shaft 96 is disposed at a rear end portion near the upper end of the shuttle module 13, and below the shuttle shaft 96, the shuttle shaft 96 is provided. A drive shaft 104 parallel to the motor 96 is provided, and the rear end of the drive shaft 104 is coaxially connected to the drive shaft 21a of the shuttle drive motor 21 via a coupling 105. That is, the drive shaft 104 for driving the half-rotary shuttle 16 via the shuttle shaft 96 and the shuttle drive motor 21 for driving the drive shaft 104 are directly coaxially connected to each other. The bed main body 1 of the sewing machine main body, which can be compactly stored at the rear end portion and below the bed main body 12, is equipped with the shuttle module 13.
Since the width dimension of 2 is also reduced, the bed portion 5 can be downsized, and the portion of the pants (sewn item) near the sewing position can be held and held by hand, and the tubular item such as pants can be moved. And the workability of the sewing work can be improved.

The drive shaft 104 does not use a gear mechanism or the like, and the shuttle drive motor 2 is connected via the coupling 105.
Since it is directly connected coaxially with the drive shaft 1, the drive force of the shuttle drive motor 21 can be efficiently transmitted to the drive shaft 104, and the drive shaft 10 can be rotated by one rotation of the shuttle drive motor 21 which is a servo motor.
Since 4 rotates once, that is, the half-turn hook 16 swings once, the drive control of the half-turn hook 16 with phase control can be simplified.

Next, a modified form in which a part of the above embodiment is modified will be described. 1] FIG. 17 conceptually shows a two-needle sewing machine 1A according to a modified embodiment. This two-needle sewing machine 1A is provided with a pair of full rotary hooks 15A, 16A, Since the rotary hook 16A is driven by the driving force of the main shaft 6, an endless timing belt 53 is wound around the pulley 51 of the main shaft 6 and the pulley 52 of the lower shaft 17 at the shaft end, so that the main shaft 6 and the lower shaft 17 are separated from each other. The gears are linked so that they rotate at the same speed. The shuttle module 13A has substantially the same structure as the shuttle module 13 except that a full rotary shuttle 16A is provided in place of the half rotary shuttle 16 and the full rotary shuttle 16A is driven independently of the main shaft 6. The servo motor 21A and the drive force transmission system for transmitting the drive force of the servo motor 21A to the full rotary hook 16A are provided.

In addition, the same parts as those in the above-mentioned embodiment are designated by the same reference numerals, and the description thereof will be omitted. In addition, the hook module 13
Other configurations in A are almost the same as those of the shuttle module 13. This two-needle sewing machine 1A has a half-turn hook 15 and 16
2 in that all rotary hooks 15A and 16A are provided instead of
Since it is different from the two-needle sewing machine 1, it basically has the same action and effect as the two-needle sewing machine 1.

2) The hook module 13 is merely an example, and it goes without saying that various modifications and changes can be made to the internal mechanisms and equipment. For example, it is possible to apply a pulse motor instead of the servo motor 21, or to directly drive the half-turn hook or the full-turn hook by the servo motor or the pulse motor.

3] In the above embodiment, the case where the present invention is applied to a two-needle sewing machine has been described as an example. However, two or more sewing needles are operated in synchronization and two or more sewing needles corresponding to the two or more sewing needles are operated. It can be similarly applied to a sewing machine having a structure for providing a thread catcher. In this case, one looper catching hook closest to the pedestal portion is interlockingly connected to the main shaft, and the remaining looper catching hooks and the motors for driving those hooks are unitized as a shuttle module, and It will be detachably fixed to the bed.

4] Further, a single chain stitch sewing machine having a single chain stitch looper (thread catcher) forming a single chain stitch, and a double chain stitch looper forming a double chain stitch (thread catcher). It is needless to say that the present invention can be applied to various sewing machines including a plurality of sewing needles and a plurality of thread catchers, such as a double chain stitch sewing machine having a).

[0046]

According to the sewing machine of the first aspect, in the sewing machine having a plurality of sewing needles and a plurality of thread loop catchers corresponding to the sewing needles, a part of the plurality of thread loop catchers is used. It includes an interlocking connecting means for interlockingly connecting the wheel catcher to the sewing machine spindle, a remaining thread loop catcher of the plurality of thread catchers, and a driving means for driving these thread catchers independently of the sewing machine spindle. Since the thread catcher module that is detachably fixed to the bed body of the sewing machine body is provided, and the drive means of the thread catcher module is arranged in series with the drive shaft that drives the thread catcher. Since the width of the hook module is reduced and the width of the bed body of the sewing machine main body to which the hook module is attached is also reduced, it is possible to grab and hold the part of the sewing product near the sewing position by hand. Cylindrical such as pants Movement of the manufactured product is facilitated, it is possible to improve the workability of the sewing operation.

In the sewing machine of claim 2, the same effect as that of claim 1 is obtained, but the drive means is arranged so as to be located at the rear end portion of the thread catcher module and below the bed portion main body portion. Since the drive means of the thread catcher module is compactly housed under the bed main body, the bed can be downsized and the workability of the sewing operation can be further improved.

In the sewing machine of claim 3, the same effect as that of claim 1 or 2 can be obtained, but the drive shaft is directly connected to the drive means coaxially through a coupling without using a gear mechanism or the like. Therefore, the driving force of the drive means can be efficiently transmitted to the drive shaft, and the drive motor of the drive means
Since the drive shaft makes one rotation by the rotation, the drive control of the thread catcher accompanied by the phase control can be simplified.

According to the sewing machine of claim 4, claims 1 to
An effect similar to that of any one of claims 3 is obtained. The thread catcher is a full rotary hook or a half rotary hook, but if the drive motor of the drive means is a servo motor or a pulse motor,
A full rotary hook or a half rotary hook can be easily driven and controlled.

[Brief description of drawings]

FIG. 1 is a perspective view conceptually showing a two-needle sewing machine according to an embodiment of the present invention.

FIG. 2 is a front view of a sewing device including a two-needle sewing machine.

3 is a right side view of the sewing device of FIG. 2. FIG.

FIG. 4 is an enlarged view of a main part of FIG.

FIG. 5 is a plan view of a main part of the cloth feeding mechanism.

FIG. 6 is a partial vertical cross-sectional side view of a main part of the cloth feeding mechanism.

FIG. 7 is a plan view showing the position switching of the drive system of the cloth feed mechanism and the shuttle module.

FIG. 8 is a plan view of a swing arm and the like of the cloth feeding mechanism.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a plan view of a main part of a rotating frame.

FIG. 11 is a plan view of a shuttle module.

FIG. 12 is a left side view of the shuttle module.

FIG. 13 is a right side view of the vertical section of the shuttle module.

14 is a vertical sectional front view taken along the line AA of FIG.

FIG. 15 is a front view of the shuttle module.

FIG. 16 is a front view showing a main part of a shuttle module.

FIG. 17 is a perspective view conceptually showing a two-needle sewing machine according to a modification.

[Explanation of symbols]

1,1A 2-needle sewing machine 6 spindle 7 sewing machine motor 8 needle bars 11a, 11b sewing needle 12 Bed body 13,13A hook module 15, 16 half-turn hook 15A, 16A full rotary hook 21,21A hook drive motor 104 drive shaft 105 coupling

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Kondo 15-1 Naedai-cho, Mizuho-ku, Nagoya-shi Brother Industries, Ltd. (72) Inventor Koichi Akabane 15-1 Naedai-cho, Mizuho-ku, Nagoya-shi Brother Industries Incorporated (72) Inventor Tomoyuki Fujita 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-shi Brother Industries, Ltd. (72) Minoru Yamaguchi 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-shi Brother Industries, Ltd. ( 56) References Japanese Unexamined Patent Publication No. 6-54972 (JP, A) Actual Development No. 6-81481 (JP, U) Patent 3156574 (JP, B2) US Patent 5458075 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D05B 57/36-57/38

Claims (4)

(57) [Claims] 1. A sewing machine having a plurality of sewing needles and a plurality of thread catchers corresponding to these sewing needles, wherein a part of the plurality of thread catchers is interlocked with a sewing machine main shaft. A bed main body portion of the sewing machine main body including an interlocking connecting means for connecting, a remaining thread loop catcher of the plurality of thread loop catchers, and a drive means for driving these thread loop catchers independently of the sewing machine main shaft. A sewing machine, wherein a thread catcher module is detachably fixed to the sewing machine, and the driving means of the thread catcher module is arranged in series with a drive shaft for driving the thread catcher. 2. The sewing machine according to claim 1, wherein the driving means is arranged at a rear end portion of the thread catcher module and below the bed main body portion. 3. The sewing machine according to claim 1, wherein the drive means and the drive shaft are coaxially connected via a coupling. 4. The sewing machine according to claim 1, wherein the thread catcher is a full rotary hook or a half rotary hook.