JP2003103077A - Device for driving sewing hoop of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for driving a sewing hoop which reduces the amount of the stretch of a driving belt by driving a sewing hoop in a well- balanced manner and hardly reduces motion response of the sewing hoop despite the long whole length of the sewing hoop. SOLUTION: The device for driving a sewing hoop includes a driving frame 11, two driving pulleys 13 provided respectively at both ends of the driving frame 11 and rotating around an axis line in parallel to the width of the driving frame 11, two driven pulleys 14 provided in the lengthwise direction of the driving frame 11 at an interval and rotating around an axis line in parallel to the width of the driving frame 11, a motor 21 connected to two driving pulley 13 respectively, and two driving belts 15 put around respectively between the driving pulley 13 and the driven pulley 14 located next each other. Connecting members 16 which respectively connect parts of two driving belts 15 and the both ends in the lengthwise direction of the sewing hoop 9 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for moving a sewing frame, on which a work cloth is stretched, in the front-rear direction or the left-right direction of a sewing machine. In the sewing machine, the left-right direction is customarily referred to as the X direction, and the front-back direction is referred to as the Y direction.

[0002]

2. Description of the Related Art A conventional sewing machine shown in FIG. 8 includes a sewing frame 70 for tensioning and holding a work cloth, and an X-direction drive device 71 for driving the sewing frame 70 in the X direction. X-direction drive device 7
1 is a drive frame 72, a drive pulley 73, and a drive pulley 7
4 and a drive motor 75 connected to the drive pulley 73,
And a drive belt 76 looped around the loop between two pulleys. The loop upper part 76b of the drive belt 76 is located immediately above the drive frame 72, and connects a part of the loop upper part 76b with the sewing frame 70.
Is provided.

The drive pulley 73 is rotatably mounted around an axis parallel to the width direction of the drive frame 72. A torque transmission shaft 78 is inserted into the drive pulley 73 so as to be rotatable and slidable in the axial direction. A rear end of the torque transmission shaft 78 is coupled to a rotary shaft of a drive motor 75 attached to the sewing machine frame, and a front end thereof is attached to a bearing 79 attached to the sewing machine frame.

Accordingly, the torque transmission shaft 78 rotated by the drive motor 75 causes the drive pulley 73 to rotate together, and the drive belt 76 wound around the drive pulley 73 is driven, so that the connected sewing frame 70 is formed. It is driven in the X direction.

[0005]

Since the drive frame is connected to one drive belt via the connecting member,
When the total length of the sewing frame was increased, the drive belt stretched as the weight of the sewing frame increased, and the operation response of the sewing frame deteriorated. Therefore, the embroidery pattern may not be generated correctly.

[0006] An object of the present invention is to solve the above-mentioned problems and to reduce the elongation of the drive belt by driving the sewing frame in a well-balanced manner even if the total length of the sewing frame is long, so that the operation response of the sewing frame does not deteriorate. It is to provide a frame driving device.

[0007]

In order to achieve the above object, a sewing frame driving device for a sewing machine according to the present invention is provided in a drive frame and in the vicinity of both longitudinal ends of the drive frame. And two drive pulleys that rotate about an axis parallel to the drive frame and two drive pulleys that are spaced from the two drive pulleys in the longitudinal direction of the drive frame and that rotate about an axis parallel to the width direction of the drive frame. A drive pulley, a rotary drive source connected to each of the two drive pulleys, and two drive belts wound in a loop between adjacent drive pulleys and drive pulleys. It is characterized in that a connecting member is provided to connect a part of the sewing frame and the vicinity of both ends in the longitudinal direction of the sewing frame on which the work cloth is stretched.

The rotary drive source is not particularly limited, but a motor is preferable because it is easy to handle.

The installation position of the connecting member with respect to the drive belt is not particularly limited, but the loop upper part and the loop lower part can be exemplified.

The positional relationship between the drive pulley and the drive pulley is
Although not particularly limited, X hung from the Y-direction drive device
In consideration of the weight balance of the directional drive device, it is preferable that two drive pulleys are provided, one on each outer side of the two drive pulleys.

Two connected to each of the two drive pulleys
A mode in which the book torque transmission shaft is connected to one rotation drive source together with the rotation direction converter can be exemplified. More specifically, the following two modes can be exemplified. (1) A mode in which two torque transmission shafts are coupled to two drive pulleys, respectively, and one rotary drive source is connected to two rotation direction changers connected to the rear end of each torque transmission shaft. In this case, in order to synchronize the two drive pulleys,
A rotary drive source is preferably connected in the center of the two rotary direction changers. (2) A slightly longer main side torque transmission shaft and a slightly shorter subordinate torque transmission shaft are coupled to one drive pulley and the other drive pulley, respectively, and the rear end portion of the subordinate torque transmission shaft and the main side torque transmission shaft are coupled. The slave side rotation direction converter and the main side rotation direction converter, which are respectively connected to the middle portion of the transmission shaft, are connected via one relay torque transmission shaft, and are connected to the rear end portion of the main side torque transmission shaft. A mode in which two rotary drive sources are connected.

Two connected to each of the two drive pulleys
A mode in which the torque transmission shafts of the book are respectively connected to two rotary drive sources can be exemplified.

The rotation direction changing machine is not particularly limited, but may be one using two bevel gears, one using two pulleys and a belt wound around a loop between the pulleys, or the like.

The present invention is not limited to the length of the sewing frame in the longitudinal direction, but the length of the sewing frame in the longitudinal direction is 3 m.
It is particularly effective in the above case, and most effective in the case of 5 m or more.

[0015]

1 to 4 show a first embodiment in which the present invention is embodied in a sewing frame driving device of a sewing machine.
This sewing machine has a machine frame composed of a pillar 1 standing on the floor surface, a lower frame (not shown) and an upper frame 3 which are supported between lower parts and upper parts of the pillar 1 and extend in the left-right direction, respectively. The table 4 is supported on the frame substantially horizontally. On the front surface of the upper frame 3, a plurality of sewing heads 5 are arranged in a row in the left-right direction at predetermined intervals, and on the lower frame, a plurality of beds 6 are located directly below the sewing machine heads 5 at substantially the same height as the table 4. It is lined up. As is well known, the needle that is vertically reciprocally driven by the sewing machine head 5 and the shuttle that is rotationally driven by the bed 6 cooperate with each other to sew a work cloth, which will be described later.

On the upper surface of the table 4, a plane rectangular frame-shaped sewing frame 9 (an embroidery frame in an embroidery sewing machine) for tensioning and holding the work cloth is placed, and the sewing frame 9 is arranged in the X direction. An X-direction driving device 10 for driving is provided. Further, on the lower surface of the upper frame 3, a Y-direction drive device 30 that drives the sewing frame 9 in the Y-direction via the X-direction drive device 10 is provided.

The X-direction driving device 10 is provided with a thin drive frame 11, and is provided near both ends in the longitudinal direction of the drive frame 11 and rotates about an axis parallel to the width direction of the drive frame 11. One drive pulley 13 and two drive pulleys 13 that are provided at intervals in the longitudinal direction of the drive frame 11 and rotate about an axis parallel to the width direction of the drive frame 11.
One driven pulley 14, a motor 21 as a rotary drive source connected to each drive pulley 13, and two drive belts 15 wound in a loop between the adjacent drive pulley 13 and drive pulley 14. Including and The loop upper side portion 15b and the loop lower side portion 1 of each drive belt 15
5a and 5a are both located above the drive frame 11, and two connecting members 16 are provided to connect a part of the two loop upper portions 15b and the respective ends of the sewing frame 9 in the longitudinal direction.

The drive frame 11 is formed in a thin shape having a height of 7 mm to 15 mm, and the width is not particularly limited, but is 100 m, for example.
It is formed to m-200 mm. A bracket 26, which is joined to a bracket 40 of a Y-direction drive device 30 described later, is attached to the upper surface of the drive frame 11.

Each drive pulley 13 is built in a mounting case 17 attached to both ends of the drive frame 11,
All of them are located above the extension of the upper surface of the drive frame 11. Further, the torque transmission shaft 20 is inserted into each of the drive pulleys 13 so that the torque transmission shaft 20 can rotate together and the drive pulleys 13 can slide in the axial direction.

Each of the two torque transmission shafts 20 is connected to one motor 21 together with a rotation direction converter. That is, the rear end of each torque transmission shaft 20 penetrates into the two bevel gear boxes 50 as rotation direction changers attached to the sewing machine frame from the front, and the front end is axially attached to the bearing 19 attached to the sewing machine frame. There is. On the side of each bevel gear box 50, two torque transmission shafts 60 extend in a direction in which they approach each other and the motor 2
Each of them is connected to one rotary shaft.

Inside the bevel gear box 50, a bevel gear connected to the rear end of the torque transmission shaft 20 and a bevel gear connected to the base end of the torque transmission shaft 60 are arranged so as to mesh with each other at a right angle. And two drive pulleys 1
The motor 3 rotates in the same direction in synchronization with the rotation of the motor 21. Further, by inserting the torque transmission shaft 20, the rotational force of the drive motor 21 that does not move in the Y direction is allowed while the Y direction drive device 30 allows the X direction drive device 10 to move in the Y direction.
Can be told.

The two driven pulleys 14 are rotatable about a support shaft 22a (parallel to the width direction of the drive frame 11) of a bearing 22 provided at a position equidistant from each drive pulley 13 on the drive frame 11. It is worn. The driven pulley 14 is located above the drive frame 11 as a whole.

The two connecting members 16 are connected to each drive belt 15
Two first connecting members 16a attached to a part of the loop upper side portion 15b of the above, and two sliders 25 that slide on two rails 24 provided in the upper surface of the drive frame 11 and extending in the X direction. The second connecting members 16b respectively attached to the above are joined together. That is, the connecting member 16 is not only connected to a part of the two loop upper side portions 15b, but also supported by the two rails 24 and the two sliders 25 so as to be slidable without rattling. The sewing frame 9 is detachably attached to the second connecting member 16b with a screw. The first connecting member 16a and the second connecting member 16b may be integrally formed. In addition, two rails 24 and two sliders 25
May be a rail 24 connected to one or a slider 25 connected to one.

The Y-direction driving device 30 has a rectangular tube-shaped rail base 31 attached to the lower surface of the upper frame 3 and extending in the Y-direction, and a rail 32 provided on the lower surface of the rail base 31 and extending in the Y-direction. A slider 33 that slides on the rail 32 and a drive unit that drives the slider 33 in the Y direction are provided. The drive unit includes a driven pulley 35 and a drive pulley 36 that are rotatably provided in front of and behind the rail base 31, and a drive belt 37 that is looped around both pulleys 35 and 36. The loop upper side portion 37a of the drive belt 37 is passed through the hollow portion of the rail base 31, and the loop lower side portion 37b has a part thereof.
3 and a bracket 40 attached below it. A rotary shaft of a drive motor 39 is connected to the drive pulley 36 via a drive shaft 38. The drive motor 39 is attached to the rear surface of the upper frame 3.

The operation of the sewing frame driving device of the sewing machine configured as described above will be described. When the drive motor 39 of the Y-direction driving device 30 is driven based on the sewing data, the drive belt 37 is driven and the slider is driven. 33 moves in the Y direction, and the driving force thereof is transmitted to the X direction driving device 10 via the brackets 40 and 26, so that the sewing frame 9 is driven in the Y direction. Similarly, the drive motor 21 of the X-direction drive device 10
Is driven based on the sewing data, the two drive belts 15 are driven and the connecting member 16 and the two sliders 2 are driven.
5 moves in the X direction, so that the sewing frame 9 is driven in the X direction.

According to the sewing frame driving device of the sewing machine constructed as described above, the two drive pulleys 13 driven by the motor 21 drive the two drive belts 15 in the same direction in synchronization with each other, By providing the connecting members 16 for connecting the respective drive belts 15 and the sewing frame 9 to the respective drive belts 15 near both ends in the longitudinal direction of the sewing frame 9, even if the sewing frame 9 has a long total length, Are driven in a well-balanced manner, the expansion of each drive belt 15 is reduced, and thus the operation response of the sewing frame 9 does not decrease.

Next, the second embodiment shown in FIG. 5 is different from the first embodiment only in the configuration of the rotation direction converter, that is, the rotation direction converter of this embodiment has a torque transmission shaft 20. Two drive pulleys 5 connected to the rear end of
1, a drive pulley 52 connected to the open ends of the two torque transmission shafts 60, and a drive belt 53 wound around the drive pulley 51 and the drive pulley 52 in a twisted state.

The sewing frame driving device of the sewing machine of this embodiment is
Basically, it is similar to the first embodiment. Also, according to this embodiment, the same effect as that of the first embodiment can be obtained.

Next, the third embodiment shown in FIG. 6 is different from the first embodiment only in the connection structure of the torque transmission shaft and the rotary drive source and the number of rotary drive sources, that is, this embodiment. Has two torque transmission shafts 20 respectively connected to the two drive pulleys 13 at the rear end thereof.
The two motors 21 are connected to each other.

The sewing frame driving device for the sewing machine of this embodiment is
Basically, it is similar to the first embodiment. Also, according to this embodiment, the same effect as that of the first embodiment can be obtained.

Next, the fourth embodiment shown in FIG. 7 is different from the first embodiment only in the connection configuration of the torque transmission shaft and the rotary drive source, that is, this embodiment has one drive pulley. The slightly longer main side torque transmission shaft 54 and the slightly shorter subordinate torque transmission shaft 55 are respectively coupled to the other drive pulley and the other drive pulley, and the rear end portion of the subordinate torque transmission shaft 55 and the main side torque transmission shaft 54 are connected. The slave side rotation direction converter 57 and the main side rotation direction converter 56, which are respectively connected to the middle portion, are connected via one relay torque transmission shaft 58, and are connected to the rear end portion of the main side torque transmission shaft 54. One motor 21 is connected.

Therefore, in the drive pulley 13 connected to the main torque transmission shaft 54, the motor 21 has the main torque transmission shaft 5
The drive pulley 13 that is rotationally driven by being directly connected to the No. 4 and is coupled to the slave side torque transmission shaft 55 has the main side torque transmission shaft 54, the main side rotation direction converter 56, the relay torque transmission shaft 58, The side rotation direction converter 57 and the slave side torque transmission shaft 55 are connected in this order to be driven to rotate.

The sewing frame driving device of the sewing machine of this embodiment is
Basically, it is similar to the first embodiment. Also, according to this embodiment, the same effect as that of the first embodiment can be obtained.

The present invention is not limited to the configuration of the above-described embodiment, and may be embodied with appropriate modifications, for example, as follows, without departing from the spirit of the invention. (1) The structure of the X-direction drive device 10 is changed to the Y-direction drive device 3
Apply to 0. (2) The sewing frame 9 is not limited to the large square frame described above, and may be, for example, a sewing frame that holds a plurality of small embroidery frames corresponding to the respective sewing machine heads. (3) Change the configuration of the rotation direction changer appropriately.

[0035]

As described above in detail, according to the sewing frame driving device for a sewing machine of the present invention, even if the sewing frame has a long overall length, it is possible to drive the sewing frame in a well-balanced manner to reduce the elongation of the drive belt. However, there is an excellent effect that the motion response of the sewing frame does not deteriorate.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts of a sewing frame driving device for a sewing machine according to an embodiment of the present invention.

FIG. 2 is a plan view of the sewing frame drive device.

FIG. 3 is a front view of the sewing frame drive device.

FIG. 4 is a sectional view taken along line III-III in FIG.

FIG. 5 is a perspective view of a main part of the sewing frame drive device according to the second embodiment of the present invention.

FIG. 6 is a perspective view of essential parts of a sewing frame drive device according to a third embodiment of the present invention.

FIG. 7 is a perspective view of a main part of a sewing frame drive device according to a fourth embodiment of the present invention.

FIG. 8 is a plan view of a conventional sewing frame driving device for a sewing machine.

[Explanation of symbols]

9 sewing frame 11 drive frame 13 Drive pulley 14 Demonstration pulley 15 Drive belt 16 Connection member 21 motor

Claims (3)

[Claims] 1. A drive frame, two drive pulleys that are respectively provided near both ends of the drive frame in the longitudinal direction and that rotate about an axis parallel to the width direction of the drive frame, and two drive pulleys. Two drive pulleys provided at intervals in the longitudinal direction of the drive frame and rotating around an axis parallel to the width direction of the drive frame; and rotary drive sources respectively coupled to the two drive pulleys, In the vicinity of both ends in the longitudinal direction of the sewing frame, which includes two drive belts wound around each other between adjacent drive pulleys and the drive pulley in a loop shape, and a part of the two drive belts and the work cloth are stretched. 2. A sewing frame driving device for a sewing machine, characterized in that a connecting member for respectively connecting and is provided. 2. Two torque transmission shafts respectively connected to the two drive pulleys, together with a rotational direction changer,
The sewing frame drive device according to claim 1, wherein the sewing frame drive device is connected to one of the rotary drive sources. 3. The sewing frame drive device according to claim 1, wherein two torque transmission shafts respectively coupled to the two drive pulleys are connected to the two rotary drive sources, respectively.