JP2004159721A - Sewing frame guiding device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive sewing frame guiding device which has only small friction and can follow a high speed sewing frame driving device. <P>SOLUTION: When the moving body 16 of the sewing frame driving device is engaged with a driving point 14 of the frame side of a sewing frame 10 and the sewing frame 10 is driven in the perpendicular direction of a side length of the frame side, the sewing frame guiding device of a sewing machine prevents the distortion of the sewing frame 10 by engaging a movable body movable only in the above direction with a guide point separated from the driving point 14 of the frame side or with the guide point 23 of the frame side opposing the frame side. For the sewing frame guiding device, a linear motor 20 levitates a mover 21 as the movable body from a stator 22 but does not apply control for driving it in the above direction. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sewing frame guide device that guides a sewing frame on which a work cloth is stretched by a sewing frame driving device.
[0002]
[Prior art]
The moving body of the sewing frame driving device is engaged with a driving point on the frame side of the sewing frame, and the sewing frame of the sewing machine is driven in a direction perpendicular to the side length of the frame side. However, when the driving points on the side of the frame are driven, distortion is likely to occur in other parts of the sewing frame. In order to prevent this distortion, it is sufficient to increase the number of driving points on the sewing frame, but this increases the cost. Therefore, in order to prevent distortion of the sewing frame, instead of increasing the number of driving points of the sewing frame by installing a sewing frame driving device, a sewing frame guide device that only guides the sewing frame is installed, and a movable body of the sewing frame guide device is provided. Has engaged with the sewing frame, and has responded by increasing the number of guide points on the side of the frame.
As shown in FIG. 8, for example, this sewing frame guide device slidably engages a slider 41 with a guide rail 40 supported by a machine frame, and engages an engaging member 43 provided on an upper surface of the slider 41 with a sewing frame. The guide is engaged with a guide point on the side of the frame 42 (for example, see Patent Document 1).
[0003]
In recent years, in the driving of the sewing frame, higher speed and higher accuracy have been studied, and as one of them, driving using a linear motor 45 as a driving device is known as shown in FIG. See Patent Document 2.). This sewing frame drive device has a linear stator 46 of a linear motor 45 disposed below a table for one side in each of the front-rear direction and the left-right direction, and a mover 47 that moves linearly along the stator 46. , The shaft body 48 is projected above the table, and the roller 49 attached to the upper end of the shaft body 48 is engaged with the sewing frame 50 to be driven. This sewing frame drive device has no relation to belt elongation, which is a problem of a drive device driven by a belt using a conventional gear, and has a high speed and high speed because a transmission gear can be eliminated. This is advantageous for accuracy.
[0004]
[Patent Document 1]
JP 2002-102571 A [Patent Document 2]
JP 2000-271363 A
[Problems to be solved by the invention]
However, in the conventional sewing frame guide device using the guide rail 40 and the slider 41, since the friction generated between the guide rail 40 and the slider 41 is large, the drive of the sewing frame 42 is braked, and the sewing frame 42 is moved at a high speed. Which made driving difficult. In addition, there is a problem that the sewing accuracy is deteriorated due to the play between the guide rail 40 and the slider 41.
[0006]
In particular, if a sewing frame guide device using a conventional guide rail 40 and slider 41 is used to guide the sewing frame 50 to be driven by a linear motor 45 capable of driving the sewing frame 50 at a high speed, the sewing frame The problem that the sewing frame guide device cannot follow the speeded-up driving of 50 becomes remarkable, and the speeding up of the driving of the sewing frame, which should be enjoyed by driving the linear motor 45, cannot be performed.
[0007]
An object of the present invention is to provide a sewing frame guide device at low cost because the friction is small and the sewing frame driving device can follow a sewing frame driven at high speed.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a sewing frame guide device for a sewing machine according to the present invention is provided in which a moving body of a sewing frame driving device is engaged with a driving point on the frame side of the sewing frame to move the sewing frame in a direction perpendicular to the side length of the frame side. The sewing frame of the sewing machine for preventing the distortion of the sewing frame by engaging a movable body movable only in the above-mentioned direction with a guide point separated from the driving point of the frame side or a guide point of the frame side opposite to the frame side. The guide device is characterized in that a linear motor configured so that a moving element as a movable body floats from a stator but is not controlled to be driven in the direction is used for the sewing frame guiding apparatus.
[0009]
The shape of the sewing frame is not particularly limited. The driving point of the frame side is not particularly limited, and may be at any position on the sewing frame. The sewing frame driving device is not particularly limited, and examples thereof include a belt driving mechanism, a ball screw driving mechanism, and a linear motor. In particular, it is preferable to use, as the sewing frame driving device, a linear motor that controls the movable member as a movable member to float from the stator and drive the movable member in the above-described direction.
[0010]
In this specification, a linear motor refers to a linear one-axis motor including a linearly extending stator and a moving member that moves on the stator. The type of the linear motor is not particularly limited, and examples thereof include a pulse type and a servo type.
[0011]
It is preferable that the movable element be rigidly connected to the movable element of the sewing frame driving device so that the driving force of the movable element is transmitted to the movable element by the rigid element. The mode of connection with the rigid body is based on the following (1) and (2) depending on where the guide point with which the moving element is engaged is located with respect to the frame side where the driving point with which the moving body is engaged. Can be illustrated.
{Circle around (1)} When the guide point is located at a position distant from the driving point on the frame side where the driving point is located, the moving element and the moving body are connected by a rigid body shaped along the side length of the frame side.
{Circle around (2)} In a case where the guide point is located on the frame side opposite to the frame side where the driving point is located, the moving element and the moving body are connected by a rigid body that is laterally laid on the two opposite frame sides. At this time, it is preferable that the connected guide points exist in the direction perpendicular to the side length of the frame side where the drive point exists, so that the rigid body does not obstruct the embroidery due to the driving of the sewing frame.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 to 4 show a sewing machine according to a first 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. In a 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.
[0013]
Immediately above the table 4, a plane rectangular frame-shaped sewing frame 10 having a pair of long sides 11 extending in the X direction and a pair of short sides 12 extending in the Y direction on which the work cloth is stretched is provided. The long side 11 has a rear side 11a and a front side 11b, and the short side 12 has a right side 12a and a left side 12b. Note that there are various cross-sectional shapes and structures on each side, and the cross-sectional shapes and structures are not limited to a specific cross-sectional shape and structure.
[0014]
A right side 12a of the rear side 11a and the short side 12 of the long side 11 is a drive for controlling the driving of the sewing frame 10 as a sewing frame driving device at two positions where the rear side 11a and the right side 12a are substantially equally divided into three. It is driven by a linear motor 15 in a direction perpendicular to the side length of the rear side 11a and the right side 12a. The driving linear motor 15 includes a control stator 17 and a moving member 16 as a moving body engaged with each frame side via an engaging member. Are controlled to drive the stator 17 in the longitudinal direction.
[0015]
The control stator 17 of the sewing frame driving device that drives the sewing frame 10 in the Y direction extends in the Y direction, which is the direction perpendicular to the length of the rear side 11a, and corresponds to the driving range of the sewing frame 10 in the Y direction. The sewing frame 10 has a length in the direction of the table 4, and the sewing frame 10 is provided at a substantially central position of the table 4 at the initial setting position of the sewing frame 10. Have been. Similarly, the control stator 17 of the sewing frame driving device that drives the sewing frame 10 in the X direction extends in the X direction that is a direction perpendicular to the length of the right side 12a, and corresponds to the driving range of the sewing frame 10 in the X direction. The length of the sewing frame 10 is substantially at the center of the table 4 on the table 4 side. Installed. In the control stator 17, a permanent magnet 18a is provided substantially at the center of the control stator 17 in the width direction, and both sides of the permanent magnet 18a extend along the length direction of the control stator 17. A linear guide 19 is provided. The magnetism of the upper surface of the permanent magnet 18a is arranged and arranged such that N poles and S poles are alternated in the length direction of the control stator 17.
[0016]
The movable member 16 (only the frame is shown, and the internal structure is not shown) is provided with four control members so that the upper surface of the control stator 17 and the lower surface of the movable member 16 always face up and down. Is provided directly above the stator 17 for use. A movable coil is incorporated in the movable element 16, and the movable element 16 lifts the sewing frame 10 by the interaction between the movable element 16 and the control stator 17, and floats. Is driven in the direction perpendicular to the side length of the frame. Sliders 16a slidably engaged with the linear guide 19 are provided on both left and right sides of the movable element 16, respectively. The movable element 16 is supplied with electricity via a motor cable (not shown) provided in a cable support 16b (the internal structure is not shown).
A roller 13 as an engaging member that engages with the sewing frame 10 is attached to an upper portion of the moving element 16, and the position of the sewing frame 10 with which the roller 13 is engaged is controlled by driving the sewing frame 10. The driving point 14 is as follows.
[0017]
Further, the front side 11b opposed to the rear side 11a driven by the driving linear motor 15 has two positions that divide the front side 11b into approximately three equal parts, and controls the sewing frame 10 as a sewing frame guide device. It is guided in a direction perpendicular to the side length of the front side 11b by a non-guide linear motor 20. The guide linear motor 20 includes a non-control stator 22 and a movable element 21 as a movable body that is engaged with the front side 11b via an engagement member.
[0018]
The non-control stator 22 extends in the Y direction, has a length in the Y direction corresponding to the driving range of the sewing frame in the Y direction, and extends in the direction perpendicular to the length of the front side 11b toward the table 4. At the initial setting position of the sewing frame 10, it is fitted and mounted immediately below two positions that divide the front side 11b into approximately three equal parts. The non-control stator 22 is provided with a permanent magnet 18b at a substantially central portion in the width direction similarly to the control stator 17, and is provided with a linear guide 19. The magnetism of the upper surface of the permanent magnet 18b is different from that of the control stator 17, and is constituted by only one pole. This one pole may be an S pole or an N pole.
[0019]
The movable element 21 as a movable body (only the frame is shown and the internal structure is not shown) is such that the upper surface of the non-control stator 22 and the lower surface of the movable element 21 always face up and down. Are provided immediately above the two non-control stators 22. The mover 21 is different from the mover 16 in that a movable coil is incorporated so that an S-pole or an N-pole, which is one of the same poles on the upper surface of the non-control stator 22, is always generated. ing. The moving element 21 lifts and floats the sewing frame 10 by interaction with the non-control stator 22, but does not perform control to drive the sewing frame 10 in a direction perpendicular to the side length of the front side 11 b. It can move only in the direction perpendicular to the side length. In addition, the moving element 21 that is passively moved by the sewing frame 10 driven by the sewing frame driving device is hardly braked.
A roller 13 as an engaging member that engages with the sewing frame 10 is attached to the upper part of the movable element 21 in the same manner as the movable element 16. The position of the sewing frame 10 with which the roller 13 is engaged is The guide point 23 guides the sewing frame 10.
[0020]
The sewing frame 10 is driven and controlled in the X and Y directions by the linear motors 15 for driving in the X and Y directions each including the control stator 17 and the moving element 16. Further, the moving element 21 is displaced together with the displacement of the sewing frame 10 by the linear motor 20 for guiding comprising the non-controlling stator 22 and the moving element 21 to move the sewing frame 10 to the length of the non-controlling stator 22. I will guide you in the direction.
In this embodiment, a mega thrust motor (pulse type: PM series) (trade name of Nippon Seiko Co., Ltd., motor body name number: ML-PD31120-AEB) is used as the drive linear motor 15 for guiding. As the linear motor 20, a modified version of the megathrust motor was used.
[0021]
According to the sewing frame guide device of the sewing machine configured as described above, the following operational effects can be obtained.
(1) The rear side 11a of the sewing frame 10 is provided by using a linear motor 15 for controlling the rear side 11a of the sewing frame 10 and controlling the linear motor 20 for controlling not driving the front side 11b. When driven by the linear motor 15, the front side 11 b is driven passively because the linear motor 20 for guiding has small friction. At this time, the moving element 21 engaged with the front side 11b is also driven passively and guided by the linear motor 20 for guiding. Therefore, since the front side 11b can follow the high-speed driving of the sewing frame 10, distortion of the front side 11b of the sewing frame 10 can be prevented, accurate driving can be realized, and high-precision stitches can be formed. Can be.
(2) In order to prevent distortion of the sewing frame 10, instead of increasing the number of driving linear motors 15, an inexpensive linear motor 20 for guiding that does not control the driving of the sewing frame 10 can be installed. An inexpensive sewing frame guide device can be provided.
(3) Since the linear motor 20 for guiding can follow the high speed of the linear motor 15 for driving which can be driven at high speed, the driving of the sewing frame 10 can be performed at high speed to increase the productivity.
[0022]
Next, FIG. 5 shows a sewing machine according to a second embodiment of the present invention and a sewing frame guide device thereof.
The sewing frame guide device of the sewing machine includes a moving element 16 of a linear motor 15 for driving and a guide point corresponding to a direction perpendicular to a side length of a driving point 14 of a frame side 11a with which the moving element 16 is engaged. The moving element 21 of the linear motor 20 for guiding which is engaged is connected to each other by a connecting bar 30 as an elongated rigid body which extends substantially horizontally across two opposing frame sides 11a and 11b below the table surface. Only what is done is different from the first embodiment. Since the positional relationship between the moving elements 16 and 21 connected to each other corresponds to the direction perpendicular to the side length of the frame side with which the moving elements 16 and 21 are engaged, the connecting bar 30 has the side length of the frame side. They are arranged at right angles.
[0023]
According to the sewing machine frame guide device of the second embodiment, in addition to the same effects as those of the first embodiment, the driving force of the moving element 16 in the Y direction is guided by the connecting bar 30 via the driving point 14. Since it is also transmitted to the point 23, the front side 11b is controlled to be driven at two positions in synchronization with the rear side 11a. Therefore, distortion of the front side 11b can be prevented, accurate driving can be realized, and highly accurate stitches can be formed.
[0024]
Next, FIG. 6 shows a sewing machine according to a third embodiment of the present invention and a sewing frame guide device thereof.
The sewing frame guide device of the sewing machine includes a guiding linear motor 20 including a non-controlling stator 22 and a moving member 21 and a driving linear motor 15 including a controlling stator 17 and a moving member 16. Are alternately arranged in parallel from the right end at five positions that divide the rear side 11a into six equal parts, which is different from the first embodiment. The guide linear motor 20 is driven in a direction perpendicular to the length of the rear side 11a of the sewing frame 10 by engaging the moving element 16 of the linear motor 15 for driving with the driving point 14 on the rear side 11a of the sewing frame 10. In doing so, a movable element 21 that can move only in a direction perpendicular to the length of the rear side 11a is engaged with a guide point 23 that is separated from the drive point 14 on the rear side 11a. Then, similarly to the guide linear motor 20 of the first embodiment, the moving member 21 is floated from the non-controlling stator 22 but is not controlled to be driven in the direction perpendicular to the side length of the rear side 11a. Have been.
The front side 11b may or may not be provided with a linear motor 20 for guiding as a sewing frame guiding device.
[0025]
According to the sewing frame guide device of the sewing machine of the third embodiment, in addition to the same effects as those of the first embodiment, distortion of the rear side 11a can be prevented, and accurate driving can be realized. Stitches can be formed.
[0026]
According to the sewing machine frame guide device of the second embodiment, in addition to the same effects as those of the first embodiment, the driving force of the moving element 16 in the Y direction is guided by the connecting bar 30 via the driving point 14. Since it is also transmitted to the point 23, the front side 11b is controlled to be driven at two positions in synchronization with the rear side 11a. Therefore, distortion of the front side 11b can be prevented, accurate driving can be realized, and highly accurate stitches can be formed.
[0027]
Next, FIG. 7 shows a sewing machine according to a fourth embodiment of the present invention and a sewing frame guide device thereof.
In the sewing frame guide device of the sewing machine, a moving element 16 of a linear motor 15 for driving and a moving element 21 of a linear motor 20 for guiding provided on both sides or one side of the moving element 16 are arranged above the table. The third embodiment is different from the third embodiment only in that the rear side 11a is engaged with the rear side 11a, and the rear side 11a is connected to each other by two connection bars 31 as rigid bodies having a shape along the side length. The connecting bar 31 may be provided above the table or may be provided below.
[0028]
According to the sewing machine frame guide device of the fourth embodiment, in addition to the same effects as the third embodiment, the driving force of the moving member 16 in the Y direction is guided by the connecting bar 31 via the driving point 14. Since it is also transmitted to the point 23, the displacement of the driving point 14 and the guide point 23 is synchronized, and the rear side 11a is driven at five positions, so that the distortion of the rear side 11a can be prevented. Furthermore, since the distortion of the rear side 11a can be prevented, the interval between the sewing frame 10 and the sewing position of the sewing machine can be made constant. As a result, accurate driving can be realized, and highly accurate stitches can be formed. Further, since the guide points 23 engaged with the sewing frame guide device can be considered as the driving points 14, the number of sewing frame drive devices can be reduced.
[0029]
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.
(1) The sewing frame driving device is a ball screw driving mechanism in which a nut is screwed into a ball screw, and the nut is provided with an engaging member that engages with the sewing frame.
(2) In the first embodiment, the Y-direction sewing frame driving device is provided with the Y-direction sewing frame driving device. However, the X-direction sewing frame driving device is provided with the X-direction sewing frame driving device. A guide device is provided to guide the sewing frame 10.
[0030]
【The invention's effect】
As described above in detail, according to the sewing frame guide device of the sewing machine according to the present invention, the friction is small, and the sewing frame guide device can follow the sewing frame driven at high speed by the sewing frame driving device. The effect is excellent.
[Brief description of the drawings]
FIG. 1 is a plan view of a sewing frame driving device and a sewing frame guide device of a sewing machine according to a first embodiment of the present invention.
FIG. 2 is a perspective view of a sewing frame driving device and a sewing frame guide device of the sewing machine according to the embodiment.
FIG. 3 is a sectional view taken along line III-III of FIG. 1;
FIG. 4 is a sectional view taken along line VI-VI of FIG. 3;
FIG. 5 is a plan view of a sewing frame driving device and a sewing frame guide device of a sewing machine according to a second embodiment of the present invention.
FIG. 6 is a plan view of a sewing frame driving device and a sewing frame guide device of a sewing machine according to a third embodiment of the present invention.
FIG. 7 is a plan view of a sewing frame driving device and a sewing frame guide device of a sewing machine according to a fourth embodiment of the present invention.
FIG. 8 is a perspective view of a conventional sewing frame guide device for a sewing machine.
FIG. 9 is an exploded perspective view of a linear motor used in a conventional sewing frame driving device of a sewing machine.
[Explanation of symbols]
4 Table 10 Sewing frame 11 Long side 12 Short side 14 Driving point 15 Linear motor 16 Moving element 17 Controlling stator 20 Linear motor 21 for guidance Moving element 22 as movable body 22 Non-controlling stator 23 Guide point 30 Connecting bar as rigid body 31 Connecting bar as rigid body

Claims (3)

When the moving body of the sewing frame driving device is engaged with the driving point on the frame side of the sewing frame to drive the sewing frame in the direction perpendicular to the side length of the frame side, a guide point separated from the driving point on the frame side. Alternatively, in a sewing frame guide device of a sewing machine for preventing a distortion of the sewing frame by engaging a movable body that can move only in the above-mentioned direction with a guide point of the frame side facing the frame side, A sewing machine frame guiding device for a sewing machine, wherein a linear motor configured to lift a moving member as a body from a stator but not to drive the moving member in the direction is used. 2. The sewing frame guide device for a sewing machine according to claim 1, wherein the sewing frame driving device includes a linear motor that controls the movable member as the movable body to float from the stator and drive the movable member in the direction. 3. The sewing frame guide device for a sewing machine according to claim 1, wherein the movable element is rigidly connected to a movable body of the sewing frame driving device, and a driving force of the movable body is transmitted to the movable element by the rigid body.

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