JP2004131872A - Sewing frame driving gear for sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an economic sewing frame driving gear with which the drive of the sewing frame is made highly precise to form high-precision seams and is accelerated to increase productivity by using a driving body suitable for the short sides and the long sides of the sewing frame. <P>SOLUTION: The sewing frame driving gear for the square frame-like sewing frame 10 has a pair of the long sides 10a and 10b and a pair of the short sides 10c and 10d for stretching a cloth to be processed. A plurality of points of the long side 10a are driven in the direction perpendicular to the length direction of the long side 10a by linear motors 40 and the short side 10c is driven in the direction perpendicular to the length direction of the short side 10c by ball screw driving mechanisms 20. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a driving device for moving a sewing frame on which a work cloth is stretched in a front-rear direction or a left-right direction of a sewing machine. In the sewing machine, the left-right direction is conventionally referred to as the X direction, and the front-rear direction is referred to as the Y direction.
[0002]
[Prior art]
The conventional sewing frame driving device drives the belt below the table by a rotary motor in the X direction and the Y direction, and engages the roller attached to the moving body fixed to the belt with the sewing frame. Most types are driven. (For example, see Patent Document 1)
[0003]
Then, in recent years, a sewing frame driving device capable of high accuracy and high speed has been studied, and one of them is a driving device using the linear motor 50 (for example, see Patent Document 2). As shown in FIGS. 7 and 8, this sewing frame driving device arranges a linear stator 52 of a linear motor 50 below a table for one side in each of an X direction and a Y direction. The shaft 54 projects from the moving element 53 that moves linearly along the table on the table, and the roller 55 attached to the upper end of the shaft 54 engages with the sewing frame 51 to be driven. This sewing frame drive device is irrelevant to belt elongation and eliminates transmission gears, which is advantageous for high precision and high speed.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2001-768 [Patent Document 2]
JP 2000-271363 A
[Problems to be solved by the invention]
However, when the present inventor studied the practical use of a drive device using a linear motor, it was found that the following problems existed at present.
That is, when the rectangular frame-shaped sewing frame is a rectangular frame-shaped sewing frame composed of a long side and a short side, it is preferable to drive a plurality of points because the long side is relatively easily distorted during driving. Since it is relatively unlikely to be distorted during driving, it is sufficient to drive one point or a plurality of points.
However, if both the long side and the short side are to be driven by a linear motor, there is no particular problem in that the long side is driven by a linear motor at a plurality of points. The benefits of conversion can be fully enjoyed. Linear motors are still expensive at the moment, but since multiple belt drives were used to drive multiple points in the past, cost increases were acceptable even if multiple linear motors were used. is there.
However, as for the short side, if one point is driven by a linear motor, the entire sewing frame is driven by one linear motor in a direction orthogonal to the short side. Therefore, a linear motor having a large driving force is required. Where they must be used, such linear motors are currently few and very expensive. Further, even if a plurality of points (for example, two or three points) with a short side are to be driven by a linear motor having a moderate driving force, a single belt driving device has conventionally been sufficient, but at present, an expensive linear motor is still required. Since a plurality of motors are used, the cost is considerably increased.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to make it possible to form a high-accuracy stitch by driving a sewing frame with high precision by using optimal driving members for the long side and the short side of the sewing frame, respectively. It is an object of the present invention to provide an economical sewing frame driving device that can increase the speed of the sewing machine and increase the productivity.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a sewing frame driving device for a sewing machine according to the present invention is a sewing frame driving device for a rectangular frame-shaped sewing frame having a pair of long sides and a pair of short sides on which a work cloth is stretched. Then, a plurality of points on the long side are driven by a linear motor in a direction perpendicular to the length direction of the long side, and the short side is driven by a ball screw driving mechanism in a direction perpendicular to the length direction of the short side.
[0008]
As used herein, the term “linear motor” refers to a linear one-axis motor including a linearly extending stator and a moving member that moves on the stator.
The number and position of the “plurality of points” are not particularly limited, and are preferably at least two points set at an interval from each other. Particularly preferably, each side is substantially equal to drive the sewing frame stably. It is a point located at the position where it divides.
[0009]
As the Y-direction driving of the sewing frame using the linear motor, there are a case where both the pair of long sides are driven and a case where only one long side of the pair of long sides is driven.
(1) When driving both of a pair of long sides {1} An aspect in which both of the pair of long sides are driven by linear motors having different stators.
{Circle around (2)} A mode in which both of a pair of long sides are driven by a linear motor having the same stator. (2) When only one long side of a pair of long sides is driven {1} A mode in which the other long side is guided by a slide guide mechanism.
{Circle around (2)} The other long side is neither driven nor guided.
[0010]
As the X-direction drive using the ball screw drive mechanism for the sewing frame, there are a case where both the pair of short sides are driven and a case where only one of the pair of short sides is driven.
(1) When driving both of a pair of short sides {1} A mode in which both of the pair of short sides are driven by ball screw driving mechanisms having different ball screws.
{Circle around (2)} A mode in which both of the pair of short sides are driven by a ball screw driving mechanism having the same ball screw.
(2) When only one short side of a pair of short sides is driven {1} A mode in which the other short side is guided by a slide guide mechanism.
(2) A mode in which the other short side is neither driven nor guided.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 to 6 show a sewing machine according to an embodiment of the present invention and a sewing frame driving device thereof.
This sewing machine has a machine frame including a column 1 standing on the floor, and a lower frame 2 and an upper frame 3 supported between a lower portion and an upper portion of the column 1 and extending in the left-right direction, respectively. The table 4 is supported substantially horizontally. A plurality of sewing heads 5 are arranged on the front surface of the upper frame 3 at predetermined intervals in the left-right direction, and a plurality of beds 6 are provided on the lower frame 2 at a position directly below each sewing head 5 at substantially the same height as the table 4. Are arranged in a row. As is well known, sewing is performed on a work cloth, which will be described later, by cooperation between a needle that is driven up and down by the sewing machine head 5 and a shuttle that is driven to rotate by the bed 6.
[0012]
A rectangular frame-shaped sewing frame 10 (an embroidery frame in the case of an embroidery sewing machine) having a pair of long sides and a pair of short sides on which a work cloth is stretched is arranged in non-contact with the table 4. These sides are referred to as a rear X long side 10a, a front X long side 10b, a right Y short side 10c, and a left Y short side 10d.
[0013]
On the right edge of the right Y short side 10c, an X direction drive frame 11 for driving the sewing frame 10 in the X direction is sufficiently longer than the right Y short side 10c, and is relatively immovable in the X direction. They are connected so as to be relatively movable in the Y direction. Specifically, as shown in FIG. 3A, a shape portion in which a vertical wall 12 extending in the Y direction extends from the plane wall is formed on the left edge of the X-direction drive frame 11, and the right Y short side 10 c is formed. A horizontal wall is formed at the right edge below the shape portion, and a pair of engagement rollers 13 rotatably mounted on a pair of support shafts erected on the horizontal wall are provided on one side of the vertical wall 12. Are engaged so as to sandwich it. The reason why the right Y short side 10c and the X-direction drive frame 11 cannot relatively move in the X direction is because the engaging roller 13 is in contact with the vertical wall 12, and the reason why the engaging roller 13 is relatively movable in the Y direction is that This is because the rotation allows relative movement. A plurality of pairs of the engagement rollers 13 are provided in the Y direction on the right Y short side 10c.
[0014]
An X-direction guide frame 14 having the same shape as the X-direction drive frame 11 is provided at the left edge of the left Y short side 10d.
[0015]
The drive device that drives the short side of the sewing frame 10 in the direction (X direction) orthogonal to the length direction of the short side is a two-position where the next ball screw drive mechanism 20 divides the X direction drive frame 11 into approximately three equal parts. , And the slide guide mechanism 30 for guiding the driving of the sewing frame 10 in the X direction is configured to guide two positions that divide the X-direction guide frame 14 into approximately three equal parts.
[0016]
As shown in FIGS. 3A and 3B, the ball screw drive mechanism 20 includes a bracket 22 attached to the rail base 21 of the lower frame 2 below the table 4, and a ball screw rotatably supported by the bracket 22. 23, a driven pulley 27 coupled to one end of the ball screw 23 and co-rotating with the ball screw 23, a nut 25 screwably screwed to the ball screw 23, and the slit plate 7 And a nut upper portion 26 projecting above the table 4 through the slit. The two ball screws 23 are driven by a motor 24 that synchronously drives a belt 28 wound around two driven pulleys 27.
[0017]
As shown in FIGS. 4A and 4B, the slide guide mechanism 30 engages with a guide rail 31 attached to the rail base 21 of the lower frame 2 below the table 4 and slidably engages with the guide rail 31. And a slider upper portion 33 which stands on the slider 32 and protrudes above the table 4 through the slits of the slit plate 7. As the guide rail 31 and the slider 32, it is convenient to use, for example, a commercially available LM guide.
[0018]
As shown in FIGS. 5 and 6, a driving device for driving the long side of the sewing frame 10 in a direction orthogonal to the length direction of the long side (Y direction) includes a linear stator 41 and a moving element 42. And a control device therefor.
On the table 4 side, four linear stators 41 extending in the Y direction of the sewing frame 10 and having a Y dimension corresponding to the driving range of the sewing frame in the Y direction are arranged so that the rear X long side 10a is substantially equal to five degrees. At four positions, the sewing frame 10 is fitted and provided directly below the rear long X side 10a.
The linear stator 41 has a permanent magnet 43 attached to a substantially central portion in the length direction of the linear stator 41, and linear guides 44 are provided on both sides of the permanent magnet 43.
[0019]
On the side of the sewing frame 10, the rear X long side 10 a of the sewing frame 10 is located at four positions just above the linear stator 41 and substantially equally dividing the rear X long side 10 a of the sewing frame 10 into five. A moving member 42 (only the frame is shown, and the internal structure is not shown) is attached via a roller 45 as an engaging member that engages with the moving member 42.
The moving element 42 has a movable coil incorporated therein so as to generate a driving force in the length direction of the linear stator 41 by interaction with the linear stator 41, and is supported by a linear guide 44. . In addition, electricity is supplied to the moving element 42 via a motor cable (not shown) provided in a cable support 46 (only a part is shown).
[0020]
In this embodiment, a mega thrust motor (pulse type: PM series) (trade name of Nippon Seiko Co., Ltd., motor main body number: ML-PD31120-AEB) is used as the linear motor 40.
[0021]
According to the sewing frame driving device of the sewing machine configured as described above, the following effects can be obtained.
(1) The driving force is concentrated on a small number (two in the present embodiment) of driving devices by using the ball screw driving mechanism 20 having a driving force on the short side for driving the sewing frame in the X direction. In addition, the driving of the sewing frame in the X direction can be performed at a high speed.
(2) By using a plurality of (four in the present embodiment) linear motors 40 on the long side for driving the sewing frame in the Y direction, distortion of the long side of the sewing frame can be prevented, and the driving force is dispersed. As a result, the speed of driving of the sewing frame can be increased to increase the productivity. In addition, since the linear motor is driven directly by magnetism without a belt and a shaft, accurate driving can be realized and a high-precision seam can be formed.
(3) The slide guide mechanism 30, which is a guide for driving the sewing frame in the X direction, guides the X direction guide frame, thereby preventing the corresponding left Y short side 10d from being deformed and deformed, and driving with high accuracy. it can.
(4) By driving the long side by the linear motor 40, compared with the conventional case where both the short side and the long side are driven by the belt, the engagement and the engagement that require mechanical precision at the time of assembly are required. Since the number of sliding parts is reduced and the structure is simplified, the assembling becomes easier and the assembling time can be reduced.
(5) Speeding up the driving of the sewing frame and increasing the productivity by using an optimal driving body for each side in which the short side is driven by the ball screw driving mechanism 20 and the long side is driven by the linear motor 40. And an economical sewing frame driving device.
[0022]
Note that the present invention is not limited to the configuration of the above-described embodiment, and may be embodied with appropriate modifications without departing from the spirit of the invention, for example, as described below.
(A) The X-direction guide frame on the left Y short side 10d side of the sewing frame 10 is not provided, and is not guided by the slide guide mechanism 30.
(B) The front X long side 10b side of the sewing frame 10 is guided by the slide guide mechanism 30.
(C) To guide the sewing frame 10 to the front X long side 10b by a slide guide mechanism connected to a linear motor that drives the rear X long side 10a of the sewing frame 10 by a connection bar.
(D) One moving element is added to the front X long side 10b, and the rear X long side 10a and the front X long side 10b of the sewing frame 10 are driven by a linear motor having the same stator.
(E) The front X long side 10b side of the sewing frame 10 is driven by a linear motor separate from the linear motor that drives the rear X long side 10a.
(F) A slide guide mechanism is provided on the same side as the side where the driving body (linear motor or ball screw driving mechanism) is provided, in parallel with the driving body.
[0023]
【The invention's effect】
As described above in detail, according to the sewing frame driving device of the sewing machine according to the present invention, the driving of the sewing frame is performed with high accuracy by using the optimal driving members for the short side and the long side of the sewing frame. It is possible to form stitches with high precision, and it is also possible to increase the speed of driving the sewing frame to increase the productivity, thereby achieving an excellent effect of being economical.
[Brief description of the drawings]
FIG. 1 is a plan view of a sewing frame driving device of a sewing machine according to an embodiment of the present invention.
FIG. 2 is a perspective view of the sewing frame driving device.
3A is a sectional view taken along line III-III of FIG. 1 and FIG. 3B is a sectional view taken along line bb of FIG.
4A is a cross-sectional view taken along line IV-IV of FIG. 1, and FIG. 4B is a cross-sectional view taken along line bb of FIG.
FIG. 5 is a sectional view taken along line VV in FIG. 1 of the sewing frame driving device.
FIG. 6 is a sectional view taken along line VI-VI of FIG. 1 relating to the sewing frame driving device.
FIG. 7 is a plan view of a conventional sewing frame driving device for a sewing machine.
FIG. 8 is an exploded perspective view of a linear motor used in the sewing frame driving device.
[Explanation of symbols]
4 Table 10 Sewing frame 10a Rear X long side 10b Front X long side 10c Right Y short side 10d Left Y short side 11 X direction drive frame 14 X direction guide frame 20 Ball screw drive mechanism 30 Slide guide mechanism 40 Linear motor 41 Linear Stator 42 mover

Claims (5)

A sewing frame driving device for a square frame-shaped sewing frame having a pair of long sides and a pair of short sides on which a work cloth is stretched, wherein a plurality of points on the long side are moved in a longitudinal direction of the long side by a linear motor. And a driving mechanism for driving the sewing machine in a direction perpendicular to the length of the short side by a ball screw driving mechanism. The sewing frame driving device for a sewing machine according to claim 1, wherein both of the pair of long sides are respectively driven by different linear motors of a stator. The sewing frame driving device for a sewing machine according to claim 1, wherein both of the pair of long sides are driven by a linear motor having the same stator. The sewing frame driving device for a sewing machine according to claim 1, wherein only one long side of the pair of long sides is driven by the linear motor, and the other long side is guided by a slide guide mechanism. 2. The sewing frame driving device for a sewing machine according to claim 1, wherein only one short side of the pair of short sides is driven by the ball screw driving mechanism, and the other short side is guided by a slide guide mechanism.

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