JP3404447B2 - Multi-head sewing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-head type sewing device equipped with a plurality of sewing mechanisms and suitable for embroidery sewing, and more particularly, the bed portion is formed as a bed unit having an independent structure to provide a sewing position and a retracted position. The present invention relates to a device in which a driving force transmission system of a thread cutting mechanism provided in each bed unit can be easily switched between a connected state and a disconnected state in association with position switching.

[0002]

Conventionally, as a sewing machine for industrial applied to the pattern sewing and embroidery sewing, for example, Japanese Application Rights 4─30
7688 Specification and Drawings (Japanese Patent Laid-Open No. 6-126054)
No. 4) and Japanese Patent Laid-Open No. 4-51991, a multi-head embroidery sewing machine has been put to practical use. In the former multi-head embroidery sewing machine, a plurality of embroidery sewing machines are arranged side by side at predetermined intervals in the left-right direction (X direction), and a common movable frame for mounting the plurality of embroidery frames is provided in the X direction and the Y direction. The machine is equipped with a work cloth feed mechanism that independently feeds and drives, and the head of each embroidery sewing machine is equipped with a needle bar case accommodating a plurality of needle bars corresponding to embroidery threads of multiple colors so that the position can be freely switched. The driving force is distributed from the main drive shaft driven by to each embroidery sewing machine to drive the main shaft and the lower shaft of each embroidery sewing machine.

The sewing machine main body of each embroidery sewing machine has a bed portion, a pedestal portion, and an arm portion extending from the upper end of the pedestal portion. The head portion at the tip of the arm portion has a needle bar driven by a main shaft. Also, a sewing needle and a balance are provided, and the bed is provided with a thread catcher hook driven by a lower shaft. still,
As the bed portion, there are a flat type and a cylinder bed type that can sew a tubular workpiece.

In the multi-head embroidery sewing machine of the latter publication, referred to as an arm type, a plurality of arm portions and a plurality of bed portions are integrally attached to a support frame common to a plurality of embroidery sewing machines. Basically, it has the same structure as the multi-head embroidery sewing machine of the above publication. However, there is also a structure called a bridge type in which the arm part is omitted and a plurality of head parts and a plurality of bed parts are fixed to a support frame. In the conventional multi-head embroidery sewing machine, generally, the bed portion is integrally fixed to the support frame (this includes the pedestal portion).

Here, Japanese Patent Publication No. 60-21750,
Real Sho 61─15816 JP, Hei 3─23429
Japanese Laid-Open Patent Publication No. 1 discloses a sewing machine in which a hook catching hook is driven independently of a sewing machine spindle by a dedicated hook drive motor. However, the hook drive motor and its driving force transmission system are It is fixedly installed in the bed. By the way, in this type of multi-head embroidery sewing machine, a thread cutting mechanism is provided in the bed portion of each embroidery sewing machine, and a drive rod for driving the thread cutting mechanism is arranged up to the rear end of each bed portion. A drive shaft connected to a thread cutting drive actuator provided at the end of the multi-head embroidery sewing machine is arranged over each embroidery sewing machine, and the rear end of each drive rod is connected to the drive shaft via a link mechanism. The embroidery threads of the respective embroidery sewing machines can be simultaneously cut by interlocking with each other and driving the actuators to simultaneously perform thread cutting operations when changing the threads of the embroidery thread.

[0006]

In the conventional multi-head embroidery sewing machine, since the space between adjacent sewing machines is fixed, it is inevitable that the X-direction feed width during sewing is restricted by the space between the sewing machines. , The sewing machine interval is set in advance by assuming the size of the material to be sewn and the X-direction feed width at the time of sewing. However, if the sewing machine interval is set to a large value, the number of sewing machines that can be installed in the specified space will decrease, resulting in equipment cost. Will be at a disadvantage. Therefore, the interval between the sewing machines is set to be small, and as many embroidery sewing machines as possible are equipped. When sewing a workpiece having a large X-direction feed width, some embroidery sewing machines are stopped and the remaining embroidery sewing machines are sewn. Although the method of sewing only by operating it is also adopted, in this case, the bed part of the embroidery sewing machine at rest interferes with the material to be sewn, which makes smooth automatic sewing difficult and reduces sewing efficiency, making it versatile. Lack.

Therefore, it is conceivable to remove the bed portion of some embroidery sewing machines, or to swing the bed portion to a retracted position in which it is retracted and swung downward from a horizontal sewing position, instead of suspending the bed. , When the main shaft that drives the needle bar and the shuttle shaft that drives the shuttle for catching the thread ring are interlocked and driven in common by the sewing machine motor, the main shaft and the shuttle shaft must be connected or disconnected. There are problems that the connecting structure of the drive system is complicated, and that the connecting structure of the drive system that drives the thread cutting mechanism provided in the bed is also complicated.

An object of the present invention is to configure each of a plurality of bed portions as a bed unit and to make them retractable and swingable so as to enhance the sewing efficiency, versatility and equipment economy of the sewing machine. It is an object of the present invention to provide a multi-head sewing device capable of easily connecting and disconnecting a drive system of a thread trimming mechanism provided in a unit.

SUMMARY OF THE INVENTION The multi-head sewing machine according to claim 1, in becomes equipped with multiple sewing mechanism to a common supporting frame multi-head sewing machine, each of the bed of the plurality of the sewing mechanism, together constituting the bed unit separate independent structure from the support frame, it can switch its proximal end and retracted position retracted swung downward as the pivot center, in a <br/> horizontal sewing position to be sewn configured to, provided with a respective thread cutting mechanism into a plurality of bed units, the driving force transmission system for transmitting a driving force from the electric actuator to these thread cutting mechanism is provided, the driving force transmission system, the position switching of the bed unit Accordingly, the thread cutting mechanism of the bed unit is provided with an engaging mechanism that switches between the connected state and the disconnected state.

Here, the support frame is a frame for connecting the head portion and the bed portion in a bridge type sewing device not equipped with an arm part, and an arm in an arm type sewing device equipped with a head part and an arm. And a frame connecting the bed and the bed,
The pedestal portion of a normal sewing machine is also included in the support frame.

To explain the operation , each of the bed portions of the plurality of sewing mechanisms is constructed as a bed unit having an independent structure separated from the support frame, and a horizontal sewing position is provided for sewing around the base end portion as a rotation center. , And the lower retracted position, it is possible to switch all bed units to the sewing position for sewing operation when the size of the work to be sewn or the lateral feed width is small.
When the size of the sewn product and the width of feed in the left / right direction are large,
It is possible to switch some of the bed units, for example, every other bed unit to the retracted position, and operate only the bed units at the remaining sewing positions to perform sewing.

Further, each of the plurality of bed units is provided with a thread cutting mechanism and a driving force transmission system for transmitting a driving force from an electric actuator to these thread cutting mechanisms, and the drive transmission system is provided with an engagement mechanism. , The engagement mechanism is switched to the connection state and the connection release state with respect to the thread trimming mechanism of the bed unit according to the position switching of each bed unit, and connects and disconnects the drive system that drives the thread trimming mechanism. It can be easily switched.

According to a second aspect of the present invention, in the invention of the first aspect, the electric actuator is one common actuator that supplies a driving force to a plurality of thread trimming mechanisms. The operation is the same as that of claim 1, but since the electric actuator is one common actuator that supplies the driving force to the plurality of thread cutting mechanisms, the plurality of thread cutting mechanisms can be easily driven synchronously. The drive system for thread cutting can be simplified and the cost can be reduced.

A multi-head sewing device according to a third aspect of the present invention is a multi-head sewing device in which a plurality of sewing mechanisms are provided on a common support frame, and each bed portion of the plurality of sewing mechanisms is separated from the support frame. The bed unit is structured so that it can be switched between a retracted position in which the base end of the bed unit is retracted and swung downward around the center of rotation and a horizontal sewing position used for sewing. A common drive shaft provided with the thread trimming mechanism and its drive rod and driving the plurality of drive rods is linked to the plurality of drive rods at the base ends of the plurality of bed units, and this drive shaft is Equipped with an electric actuator that drives in the axial direction, the drive shaft is connected to each drive rod at the connecting position when the bed unit is in the sewing position, and swings toward the retracted position. It is provided with a fastening mechanism comprising a coupling release state upon.

To explain the operation , each of the bed portions of the plurality of sewing mechanisms is constructed as a bed unit having an independent structure separated from the support frame, and a horizontal sewing position is provided for sewing around the base end portion as a rotation center. And the lower retracted position are switchable, so that the same operation as in claim 1 is achieved. Further, when the switchable bed unit is switched to the sewing position, the engagement mechanism provided at the connecting portion between the drive shaft and each drive rod is brought into a connected state, so that the drive shaft is driven by the electric actuator. Then, the drive rod provided in each bed unit is driven through the engagement mechanism in the connected state, and the thread cutting mechanism operates. On the other hand, when the bed unit swings downward to the retreat side, the engagement mechanism is in the connection release state, so that connection and release of the drive system for driving the thread cutting mechanism by the engagement mechanism can be easily switched. .

According to a fourth aspect of the present invention, in the multi-head type sewing device according to the third aspect of the invention, the engagement mechanism includes an engagement hole member provided in the bed unit and an engagement hole member provided in the drive shaft. And an engagement pin that is engaged with and disengageable from the hole. Explaining the operation, the same operation as in claim 3 is achieved, but the engaging mechanism is detachable from the engaging hole member provided in the bed unit and the engaging hole of the engaging hole member provided in the drive shaft. Since it has an engaging pin that engages with, the engaging mechanism can have a simple structure, and the connected state and the disconnected state can be easily switched.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a multi-head embroidery sewing machine including three embroidery sewing machines. The multi-head embroidery sewing machine M will be described. As shown in FIG. 1, a common support frame 2 extending in the left-right direction is provided upright on the rear side of the upper surface of a base frame 1 extending in the left-right direction. To 3
One head part 4 to 6 is arranged in parallel in the left-right direction at predetermined intervals, and a cylindrical bed part is formed in the bed units 10 to 12 of independent structure corresponding to each of the head parts 4 to 6. The rear end portions 7 to 9 are respectively supported by the base frame 1.

That is, three multi-needle type embroidery sewing machines (sewing), which are composed of heads 4 to 6 provided on the support frame 2 and bed units 10 to 12 corresponding to the heads 4 to 6, respectively. M1 to M3 (corresponding to the mechanism) are arranged in parallel.
At the front end of each of the head portions 4 to 6 of the embroidery sewing machines M1 to M3, twelve needle bars arranged in a row in the left-right direction are supported so as to be vertically movable, and twelve balances 15 are provided.
The needle bar cases 16 that swingably support the needle bar cases 16 are movably supported in the left and right directions. The needle bar cases 16 are simultaneously moved in the left and right direction by a needle bar changing mechanism driven by a needle bar changing motor (not shown). It is possible to change the thread color of the embroidery thread that has been moved and used for embroidery sewing at the same time.

On the upper side of the base frame 1, the same height as the upper surfaces of the bed units 10 to 12,
The work table 17 is arranged horizontally, includes the work table 17, and includes a pair of auxiliary tables 18 and 19 provided on both left and right sides of the work table 17, and has a rectangular frame shape in plan view. A movable frame 20 is provided, and is moved in the left-right direction by an X-axis drive mechanism (not shown) and is also moved in the front-rear direction by a Y-axis drive mechanism so that it can be moved on the XY plane. By the way, each embroidery sewing machine M1
An elevating drive mechanism that is provided for each M3 and that vertically drives the needle bar, and a needle bar jump that causes the needle bar to jump to its upper position to selectively vertically drive one of the 12 needle bars. Since the mechanism is similar to that of a normal embroidery sewing machine, its description is omitted.

Next, the bed units 10 to 12 will be described with reference to FIGS. 3 to 7. Here, each of the three bed units 10 to 12 has an independent structure, and the front end portion thereof has a unitized pot module 2
6 is provided, and a thread cutting mechanism 35 is provided. However, although the central bed unit 11 is fixedly supported by the base frame 1 at its base end,
The bed units 10 and 12 on both sides are supported so as to be vertically swingable. Therefore, the bed unit 10 at the left end will be described.

The bed case 25, which has a substantially U-shaped cross section and has a predetermined length in the front-rear direction, is supported at its rear end portion in a vertically swingable manner on the base frame 1 through a swinging mechanism 45, which will be described later. A hook module 26 is detachably fixed to the front end portion of the bed 25, and a thread trimming mechanism 35 is provided. The upper side of the bed case 25 is covered with the needle plate 31 at the front end portion thereof, and the needle plate 3 is provided.
It is covered with a cover plate 32 continuous with 1. Explaining the shuttle module 26, as shown in FIG. 2, the full rotary shuttle 27 and the shuttle drive motor 28 are attached to a mounting block (not shown), and the shuttle shaft 29 fixed to the full rotary shuttle 27 is a cup. It is connected to the drive shaft of the shuttle drive motor 28 via a ring 30. As a result, the rotation of the shuttle drive motor 28 causes the full-rotary shuttle 27 to be rotationally driven independently of the sewing machine motor via the shuttle shaft 29.

Next, a thread cutting mechanism 35 which is provided immediately below the needle plate 31 and cuts the upper thread and the lower thread, and a thread cutting drive rod 38 which is a driving force transmission system for driving this thread cutting mechanism.
Will be described with reference to FIGS. 3 and 4. A fixed plate (not shown) fixed to the upper end of the mounting block is a full rotary hook 27.
The movable blade 36 is pivotally supported on its fixed plate so as to be swingable between a standby position shown by a solid line and a maximum rotation position shown by a two-dot chain line. And this movable blade 36
The fixed blade 37 for cutting the upper thread and the lower thread in cooperation with
The blade portion is attached to the lower side of the needle plate 31 immediately above the fixed plate with the blade portion facing forward.

The thread cutting drive rod 38, the front end portion of which is connected to the movable blade 36, extends through the bed case 25 rearward. Here, the bed unit 11 has a hook module 70 having a full-rotation hook at the front end thereof.
Is detachably fixed, a thread cutting mechanism (not shown) 71 is provided, and a thread cutting drive rod 72 connected to the thread cutting mechanism 71 is provided. Similarly, the bed unit 12 also has a shuttle module 73 having a full-rotary shuttle detachably fixed to the front end thereof, a thread cutting mechanism (not shown) 74, and a thread cutting mechanism 74. A thread trimming drive rod 75 is provided.

By the way, as shown in FIGS. 4 to 6, a pivot member 40 is fixedly attached to a side wall of the rear end of the bed case 25, and a horizontal wall portion 40a of the pivot member 40 has a plan view. A substantially L-shaped engagement hole member 41 is rotatably supported, and a rear end portion of the thread cutting drive rod 38 is rotatably supported by the first support portion 41a of the engagement hole member 41. There is. Further, the second support portion 41b of the engagement hole member 41 has an elliptical engagement with which an engagement pin 89 of a drive block 88 attached to a thread cutting drive shaft 87 of a thread cutting drive mechanism 80 described later engages. Hole 41
c is formed. Here, the engaging hole member 41, the engaging pin 89 and the like constitute an engaging mechanism 90, and the bed unit 12 is also provided with a similar engaging mechanism 93.

By the way, the engaging hole member 41 is biased in the counterclockwise direction in plan view by the winding spring 42 wound around the pivot shaft provided upright on the pivot member 40, whereby the engaging hole A stop pin 43 provided on the member 41 is brought into contact with the pivot member 40 so that the engagement hole member 41 is always held at the standby position shown in FIG. That is, the thread cutting drive shaft 87 moves to the right, and the thread cutting drive rod 38 moves forward through the clockwise rotation of the engagement hole member 41, whereby the movable blade 36 rotates clockwise. Direction and the forward movement to the maximum rotation position indicated by the chain double-dashed line, the thread cutting drive rod 38
When the movable blade 36 is moved back in the counterclockwise direction due to the backward movement of the movable blade 36, the upper thread that is inserted through the needle hole 31a of the needle plate 31 and the lower thread that extends from the full rotary hook 27 are moved by the movable blade 36. The upper thread and the lower thread are simultaneously cut by the cooperation of the movable blade 36 and the fixed blade 37 while the movable blade 36 is engaged with the concave portion 36a and then returned to the standby position.

2 to 5 of the swinging mechanism 45 for switching the bed unit 10 between the horizontal sewing position and the retracted position in which the bed unit 10 is swung downward with the base end thereof as the center of rotation. It will be described based on. Here, the bed unit 10 is provided with a swinging mechanism 49 similar to the swinging mechanism 45, and can similarly switch between the sewing position and the retracted position. The base end of the pivot bracket 46 is fixed on the base frame 1 with a bolt 47, and the base end of the bed case 25 is attached to a pair of left and right pivot supports 46a formed on the front protrusion of the pivot bracket 46. It is pivotally supported by a pivot bolt 48.

As a result, as shown in FIG. 5, the bed unit 10 pivots around the pivot bolt 48 at the base end of the bed unit 10 to a horizontal sewing position indicated by a solid line, and the rocking retracts downward from the sewing position. At the retracted position indicated by the two-dot chain line that was moved,
It can be switched manually. At this time, according to the position switching of the bed unit 10, the bed unit 10
The thread cutting mechanism 35 can be switched between the connected state and the disconnected state via the engagement mechanism 90 provided in the driving force transmission system.

Next, a pair of fixing mechanisms 50, 51 for switching the bed unit 10 to its sewing position and fixing the bed unit 10 in a releasable manner will be described with reference to FIGS.
Rear ends of supporting plates 52 and 53, which are disposed adjacent to both left and right sides of the pivot bracket 46, are fixed to the base frame 1 by bolts 54, respectively, and front ends of the left supporting plate 52 are A fixing mechanism 50 for fixing the bed unit 10 to the base frame 1 is provided, and a similar fixing mechanism 51 is also provided at the front end portion of the right support plate 53. Therefore, the right fixing mechanism 51 will be described. .
Here, as shown in FIG. 2, the bed unit 12 includes:
A fixing mechanism 62 similar to the fixing mechanism 50 is provided on the left side thereof, and a fixing mechanism 63 similar to the fixing mechanism 51 is provided on the right side thereof.

A fixed connecting plate 56 is fixed to the lower side of the rear portion of the bed case 25 near the rear end by screws.
6, the front end of the fixed plate 57 is screwed at the rear end thereof. The fixed plate 57 is formed of a plate member having a predetermined width on the left and right, and a U-shaped notch 57a for receiving a part of a fixing bolt / nut member 60 described later is formed at the right end portion thereof. At the front end of the support plate 53, as shown in FIGS.
An elongated hole 53a extending rightward from a position corresponding to 7a is formed. Then, the vertical fixing bolt 58 with a washer having the bolt head 58a is attached to the elongated hole 5
A nut 59 formed in a three-step shape is screwed into a leg portion 58b of the fixing bolt 58 which extends downward through the 3a.

That is, the uppermost small diameter portion 59a of the nut 59
Is slidably and non-rotatably fitted into the long hole 53a, and is continuous with the middle diameter portion 59b below the small diameter portion 59a.
Is a large-diameter nut body 59c that is engageable with the U-shaped notch 57a and is continuous to the lower side of the medium-diameter portion 59b.
Can be supported by contacting the U-shaped notch 57a of the fixed plate 57 from below. Here, the thickness of the middle diameter portion 59b in the vertical direction is slightly smaller than the thickness of the fixed plate 57.

Then, as shown in FIG. 8, the fixing bolt 5
By sliding the bolt / nut member 60 in which the nut 59 is screwed onto the screw 8 to the left fixed side and tightening the bolt head 58a, the upper surface of the nut body 59c is located below the U-shaped notch 57a. While the fixed plate 57 can be fixed to the support plate 53 by abutting from it, as shown in FIG.
Slide 0 to the right side to release the fixing, and bolt head 58
By tightening a, the upper surface of the intermediate diameter portion 59b comes into contact with the support plate 53 from below, and the bolt / nut member 60 can be easily fixed to the support plate 53. At this time, the fixed plate 57
Becomes free, and the bed unit 10 can be switched to the lower retracted position via the swinging mechanism 45.

Next, referring to FIGS. 4 and 7, a pair of left and right positioning mechanisms 65, 66 for positioning the relative position of the bed unit 10 in the horizontal direction with respect to the support frame 2 when the bed unit 10 is switched to the sewing position. Explain. However, since the positioning mechanisms 65 and 66 have substantially the same configuration, the right positioning mechanism 66 will be described. A positioning screw 67 having a tapered pin portion 67a at the lower end is fixed to the front end portion of the support plate 53. On the other hand, a rearward facing cutout portion 57b is formed in a portion of the fixed plate 57 corresponding to the positioning screw 67. That is, when the bed unit 10 is raised from the retracted position and switched to the sewing position, the bed unit 1
In the front-rear direction of 0, positioning is performed with high precision through the swing mechanism 45, and the positioning screw 67 is provided in the notch 57b.
By engaging the pin portion 67a of the bed unit 1
The horizontal direction of 0 can be positioned with high precision.

Next, a thread cutting drive mechanism (corresponding to a driving means) 80 for driving the thread cutting mechanisms 35, 71, 74 will be described with reference to FIGS. 2, 4 and 10. A thread cutting motor (corresponding to an electric actuator) 82 is attached from below to a mounting plate 81 fixed to the left end portion of the base frame 1, and a drive gear 83 of this thread cutting motor 82.
The fan-shaped swinging member 84 that meshes with is pivotally supported on the mounting plate 81 by a stepped bolt 85.

Further, a base end portion of a plate-like connecting plate 86 is attached to the swing member 84, and a tip end portion of the connecting plate 86 extends in the left-right direction and is provided in each bed unit 10-12. The left end portion of a common thread-cutting drive shaft 87 that is interlockingly connected to the thread-cutting drive rods 38, 72, and 75 that are formed is connected. The thread cutting drive shaft 87 is provided with a drive block 8 corresponding to the base end portions of the bed units 10 to 12.
8, 91, and 92 are fixed to each other, and the thread trimming drive shaft 87
Engaging mechanisms 90 and 93 are provided at the connecting portions between the thread cutting drive rods 38 and 75, respectively.

As a result, when the thread cutting motor 82 rotates in the counterclockwise direction, the swing member 84 rotates clockwise by a predetermined angle, and the thread cutting drive shaft 8 via the connecting plate 86.
By moving 7 to the right by a predetermined distance, the drive block 88 attached to the thread cutting drive shaft 87 as described above.
The engaging hole member 41 is rotated from the standby position shown by the solid line in FIG. 4 to the operating position shown by the chain double-dashed line through the engagement of the engaging pin 89 of FIG. The thread cutting drive rod 38 is moved forward, and the movable blade 36 is moved forward to the maximum rotation position.

On the other hand, the clockwise rotation of the thread trimming motor 82 causes the engagement hole member 41 to rotate counterclockwise through the movement of the thread trimming drive shaft 87 to the left to drive the thread trimming drive. In response to the backward movement of the rod 38, the upper thread and the lower thread engaged with the movable blade 36 are cut. At this time, the thread trimming mechanism 74 provided in the bed unit 12 also
Through the engaging mechanism 93 and the thread trimming drive rod 75, and regarding the thread trimming mechanism 71 provided in the bed unit 11, the thread trimming drive rod 72 directly driven by the drive block 91 is used to simultaneously perform thread trimming. The operation is executed.

The operation of the above multi-head embroidery sewing machine M will be described. In the multi-head embroidery sewing machine M, three embroidery sewing machines M1 to M3 are arranged side by side on a common support frame 2.
The bed portions 7 to 9 of the embroidery sewing machines M1 to M3 are configured as bed units 10 to 12 having an independent structure, and the bed unit 10 is pivoted by the swinging mechanism 45 so that the pivot bolts 48 at the base end portion thereof are provided. Can be switched between a horizontal sewing position and a retracted position which is retracted and swung downward with the center of rotation as the center of rotation, and the bed unit 12 is similarly switched between the sewing position and the retracted position via the swing mechanism 49. When the size of the work to be sewn or the feed width in the left-right direction is small, all the bed units 10 to 12 are switched to the sewing position to perform the sewing operation. Is large, some of the bed units, for example, the bed units 10 and 12 are switched to the retracted position (see FIG. 5) and only the bed unit 11 at the remaining sewing position is produced. Is not it can be sewn.

In addition, in each bed unit 10-12,
The thread cutting mechanisms 35, 71, 74 are provided at the front ends thereof, and the thread cutting drive rods 38, 72, 75 connected to the thread cutting mechanisms 35, 71, 74 are arranged up to the base end. On the other hand, the thread cutting drive shaft 87 connected to the thread cutting motor 82 of the thread cutting driving mechanism 80 provided at the left end portion of the base frame 1 has a bed cutting unit 10-1.
Drive blocks 88, 91, 92 are fixed to the base end portions of the two, respectively, and engaging mechanisms 90, 9 are provided at the connecting portions between the thread cutting drive shaft 87 and the thread cutting drive rods 38, 72, 75.
3, 94 are provided respectively.

That is, as described for the bed unit 10, the engaging hole member 41 provided at the rear end of the bed unit 10 and the thread cutting drive shaft 87 are attached to the engaging hole member 41. Since the engagement mechanism 90 is configured by the engagement pin 89 of the drive block 88 that is detachably engaged with the bed unit 1, as shown by the solid line in FIG.
When 0 is switched to the sewing position, the thread trimming drive shaft 8
7, the engaging mechanism 90 provided at the connecting portion between the thread cutting drive rod 38 and the thread cutting drive rod 38 is brought into a connected state. Therefore, when the thread cutting drive shaft 87 is driven by the thread cutting motor 82, the engaging mechanism 90 in the connected state is moved. Through this, the thread cutting drive rod 38 provided in the bed unit 10 is driven to operate the thread cutting mechanism 35.

On the other hand, when the bed unit 10 swings downward, the engaging hole member 41 moves downward together with the bed case 25, as shown by the chain double-dashed line in FIG. By disengaging the engagement pin 89 from the engagement hole 41c, the engagement mechanism 90 is released from the connection state.
The engagement mechanism 90 can easily release the connection of the drive system that drives the thread cutting mechanism 35. At this time, since the engaging hole member 41 is held at the standby position by the winding spring 42 and the stop pin 43, when the bed unit 10 is switched to the sewing position, the engaging pin 89 is engaged with the engaging hole 41c.
The thread cutting mechanism 35 can be easily and surely engaged with the thread cutting mechanism 35.
The drive system of can be easily connected.

As described above, the bed portions 7 to 9 of the embroidery sewing machines M1 to M3 are replaced with the bed units 10 to 12 having an independent structure.
And the bed unit 10 by the swing mechanism 45,
Further, since the bed unit 12 can be switched between the horizontal sewing position and the lower retracted position with the base end portion as the center of rotation by the swinging mechanism 49, the size of the material to be sewn and the lateral feed width can be adjusted. Accordingly, it is possible to switch some of the bed units 10 and 12 to the retracted positions as necessary to prevent interference with the material to be sewn, thereby increasing sewing efficiency and increasing versatility of the sewing device. It is possible to increase the equipment economy by increasing the number of head units.

Further, each of the plurality of bed units 10 to 12 is provided with a thread cutting mechanism 31, 71, 74 and a thread cutting drive rod 38, 72, 75, and a thread cutting drive shaft 87 and a thread cutting motor 82 are provided. Since the thread trimming drive mechanism 80 is provided, and the engagement mechanisms 90 and 93 that are in the coupled state and the uncoupled state are provided at the coupling portions of the thread trimming drive shaft 87 and the thread trimming drive rods 38 and 75, respectively. Unit 10,
When 12 is switched to the sewing position, the thread cutting drive shaft 87 and the engaging mechanisms 90 and 93 provided at the connecting portions of the thread cutting drive rods 38 and 75 are in a connected state, and the thread cutting motor 82 drives the thread cutting. The shaft 87 is driven, and the cutting drive rod 38,
75 is driven so that the thread cutting mechanism 35, 74 can perform thread cutting operation. On the other hand, when the bed units 10 and 12 swing downward, the engaging mechanisms 90 and 93 are in the connection release state, so connection and release of the drive system that drives the thread trimming mechanisms 35 and 74 is easy. Can be switched to.

It should be noted that the bed unit 11 is also configured so as to be swingably supported, and in the engaging mechanism 90, the engaging pin 89 of the drive block 88 is inserted into the engaging hole member 41.
A bifurcated portion for sandwiching the thread, or an engaging pin provided in the engaging hole member 41 and an engaging hole provided in the drive block 88, or a rotary type or straight type instead of the thread cutting motor 82. A dynamic solenoid is used, or a thread cutting drive rod provided in each of a plurality of head units is driven by a plurality of electric actuators. Various changes may be made based on the above technology. Further, it is needless to say that the present invention can be applied to various multi-head type sewing devices in which the head portions 7 to 9 are formed as a bed unit having an independent structure.

[0043]

Effects of the Invention According to the multi-head sewing machine according to claim 1, double
Each of the bed portions of the plurality of sewing mechanisms is configured as a bed unit having an independent structure, and the base end portion thereof is used as the center of rotation for sewing.
Since it can be switched between the sewing position to be sewn and the retracted position below, depending on the size of the workpiece and the feed width in the horizontal direction,
Also, if necessary, you can switch some of the bed units to the retracted position to prevent interference with the material being sewn, increasing sewing efficiency, increasing versatility of the sewing machine, and increasing the number of head units. Can be increased to improve equipment economy.

Further, each of the plurality of bed units is provided with a thread cutting mechanism and a driving force transmission system for transmitting a driving force from the electric actuator to these thread cutting mechanisms, and the driving force transmission system is in a connected state and a disconnected state. Since the engagement mechanism that switches is provided, the engagement mechanism is switched to the connection state and the connection release state with respect to the thread cutting mechanism of the bed unit according to the position switching of each bed unit, and drives the thread cutting mechanism. The connection and disconnection of the drive system can be easily switched.

According to the multi-head type sewing device of claim 2, the same effect as that of claim 1 is obtained, but the electric actuator is
Since it is a single common actuator that supplies a driving force to a plurality of thread trimming mechanisms, the plurality of thread trimming mechanisms can be easily driven in synchronization, and the drive system for thread trimming can be simplified and the cost can be reduced.

According to the multi-head type sewing device of claim 3, a plurality of sewing machines are provided.
Each of the bed portion of the sewing mechanism of is configured as a bed unit of an independent structure separated from the support frame,
Since it is configured such that it can be switched between a horizontal sewing position that is used for sewing around the base end and a retracted position below,
The same effect as that of the first aspect can be obtained. Further, each of the plurality of bed units is provided with a thread trimming mechanism and a drive rod, the drive means is provided with a drive shaft and an electric actuator, and the connection portion between the drive shaft and each drive rod is in a connected state and a released state. When the bed unit is switched to the sewing position, the engagement mechanism provided at the connecting portion between the drive shaft and each drive rod is in the connected state, and the drive shaft is driven by the electric actuator. The drive rod is driven through the engagement mechanism in the connected state, and the thread cutting operation can be performed by the thread cutting mechanism. On the other hand, when the bed unit swings downward, the engagement mechanism is in the connection release state, so that connection and release of the drive system for driving the thread trimming mechanism can be easily switched.

According to the multi-head type sewing device of claim 4, the same effect as that of claim 3 is obtained, but the engaging mechanism has the engaging hole member provided in the bed unit and the engaging hole provided in the drive shaft. Since it has the engagement pin which engages with the engagement hole of the hole member in a disengageable manner, the engagement mechanism can have a simple structure, and the connection state and the connection release state can be easily switched.

[Brief description of drawings]

FIG. 1 is a perspective view of a multi-head embroidery sewing machine.

FIG. 2 is a plan view of relevant parts showing a work table and a bed unit.

FIG. 3 is a partially enlarged plan view of a front end portion of the bed unit.

FIG. 4 is a partially enlarged plan view of a base end portion of the bed unit.

5 is a vertical sectional side view taken along the line AA of FIG.

FIG. 6 is a vertical sectional side view taken along the line BB of FIG.

FIG. 7 is an enlarged plan view of a fixing mechanism.

FIG. 8 is a vertical sectional front view of the CC line of FIG. 7 in a fixed state.

9 is a vertical cross-sectional front view of the CC line of FIG. 7 in a fixed release state.

FIG. 10 is an enlarged plan view of the thread trimming drive mechanism.

[Explanation of symbols]

M Multi-head embroidery sewing machine 2 support frame 10-12 bed units 35 Thread trimming mechanism 36 movable blades 37 fixed blade 38 Thread trimming drive rod 41 Engagement hole member 41c Engagement hole 45 Swing mechanism 49 Swing mechanism 46 pivot bracket 48 pivot bolt 72 Thread cutting drive rod 75 Thread trimming drive rod 80 Thread trimming drive mechanism 82 thread trimming motor 87 Thread cutting drive shaft 90 Engagement mechanism 93 Engagement mechanism

Claims (4)

(57) [Claims] 1. In a multi-head sewing machine having a plurality of sewing mechanisms mounted on a common support frame, each of the bed portions of the plurality of sewing mechanisms is configured as an independent structure bed unit separated from the support frame. , A retractable position in which the base end portion is pivoted downward with respect to the rotation center, and a horizontal sewing position used for sewing are switchable, and a plurality of bed units are provided with thread trimming mechanisms, respectively. the driving force transmission system for transmitting a driving force from the electric actuator to the thread cutting mechanism provided on the drive force transmission system, decoupling a coupled state with respect to the thread cutting mechanism of the bed unit in accordance with the position switching of the bed unit A multi-head type sewing device characterized in that an engagement mechanism for switching between a state and a state is provided. 2. The multi-head sewing device according to claim 1, wherein the electric actuator is one common actuator that supplies a driving force to a plurality of thread trimming mechanisms. 3. A multi-head sewing machine having a plurality of sewing mechanisms mounted on a common support frame, wherein each of the bed portions of the plurality of sewing mechanisms is configured as an independent bed unit separated from the support frame. , A retractable position in which the base end portion is pivoted downward with respect to the center of rotation, and a horizontal sewing position used for sewing can be switched, and the thread cutting mechanism and its drive rod are respectively provided in a plurality of bed units. A common drive shaft provided with driving means for driving the plurality of drive rods, which is interlockingly connected to the plurality of drive rods at the base end portions of the plurality of bed units, and an electric actuator for driving the drive shaft in the axial direction thereof. The connecting portion between the drive shaft and each drive rod is connected when the bed unit is in the sewing position and is disconnected when the bed unit is swung to the retracted position side. Multi-head sewing machine, characterized in that to deliberately made engagement mechanism. 4. The engagement mechanism has an engagement hole member provided in the bed unit, and an engagement pin provided in the drive shaft and engageably and disengageably engaged with an engagement hole of the engagement hole member. The multi-head type sewing device according to claim 3, wherein