JP2000014120A - Linear moving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase thrust, without changing the rigidity of a movable body by guiding and moving the movable body on a base substance by a linear guiding means and by the thrust of a pair of linear motors, and arranging it in a direction parallel to a substance supporting surface. SOLUTION: Respective coils 30a, 31a of a pair of linear motors 30, 31 are fixed to a pair of confronting internal surfaces 32a, 32b of a box-like housing 32 having a square cross section. The legs at both ends of a square pillar 33 are fixed to recesses 1a formed in a base 1, so that its left sand right side surfaces 33a, 33b are parallel to a track 2a. A pair of linear guiding apparatuses 34 are composed of tracks 34a and bearings 34b, and individual tracks 34a, 34a are fixed to the top surface 33c and the underside 33d of the square pillar 33 so as to be parallel to the track 2a. A magnetic field is generated by causing specified currents to flow in the coils 30a, 31a, and the housing 32 is moved in an X-direction by magnetic forces generated between the magnetic field and magnets 30b, 31b. Electromagnetic forces by the linear motors 30, 31 cancel their attractive forces in the direction Y and do not deform a table 3, and the wiring precision of a borer 29 for printed boards is not lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear moving device suitable for moving, for example, a table of a printed circuit board drilling machine.

[0002]

2. Description of the Related Art Conventionally, a linear moving device is incorporated in, for example, a printed board drilling machine shown in FIG. FIG. 4 is a sectional view taken along the line AA of FIG.

The bed 1 is provided with a table 3 which can be moved back and forth by a linear guide device 2 for the table.
The linear guide device 2 includes a track 2a and a bearing 2b. The track 2a is on the bed 1 and the bearing 2b
Are fixed to the table 3, respectively. The X-axis linear motor 4 includes a coil 4a and a magnet 4b. The coil 4a is placed on the table 3 and the magnet 4
b are fixed to the bed 1 respectively. Since it is difficult to manufacture the magnet 4b having a large area,
The magnet 4b is formed not by one, but by arranging many magnets 4b having a small area. A plurality of printed boards (hereinafter, simply referred to as “boards”) 5 are fixed at predetermined positions on the board supporting surface 3 a of the table 3.

The column 11 is fixed to the bed 1.
The bed 1 and the column 11 form a base 10. The track 12 is fixed to the column 11 in the left-right direction.
3 guides the movement of bearings (not shown) fixed to the back surface of the bearing 3, respectively, and constitutes a linear guide device (no reference numeral) for the saddle.

The magnet 14 is fixed to the column 11 in the left-right direction, and a coil (not shown) fixed to the back of the saddle 13 constitutes a Y-axis linear motor (no reference numeral). The track 16 is fixed to the saddle 13 in the vertical direction to guide the movement of a bearing (not shown) fixed to the back of the plate 17, and constitutes a linear guide device for the plate (no reference numeral) with the bearing. are doing.

The ball screw 18 is screwed into a nut (not shown) fixed to the back surface of the plate 17 in a vertical direction,
The plate 17 is rotated by a motor 15 on the saddle 13.
Is raised and lowered. The spindle 19 is fixed to the plate 17. The drill 20 is rotatably held by the spindle 19.

[0007] As shown in FIG. 4, the linear moving device 6 includes the linear guide device 2 and the linear motor 4.

Next, the operation of the printed circuit board punch will be described.

A control device (not shown) operates the X-axis linear motor 4 and the Y-axis linear motor (motor having the magnet 14) in accordance with a machining program which has been input in advance. That is, the control device applies a predetermined current to each coil to generate a magnetic field, and moves the table 3 in the X direction and the saddle 13 in the Y direction by the magnetic force acting between the coil and the magnet. ,
The drill 20 is made to face a predetermined position of the substrate 5. Thereafter, the plate 17 is lowered to a predetermined position by operating the motor 15, a hole is formed in the substrate 5, and
The plate 17 is raised.

[0010] As described above, the printed board drilling machine, for example, when the moving stroke of the table 3 is 1 m, the running accuracy (position accuracy of the table 3 in the moving range) is 5 μm.
m, and the hole can be accurately drilled at a predetermined position.

[0011]

In order to increase the processing speed, it is necessary to increase the moving speed of the table 3.

However, when the thrust of the linear motor 4 is increased, the electromagnetic force (attraction in this case) generated between the coil 4a and the magnet 4b is increased, and as shown by a dotted line in FIG. Dents only by δ. When the table 3 is deformed, the substrate 5 tilts, and it becomes impossible to accurately drill holes at predetermined positions, and the quality of the substrate deteriorates.

In this case, if the rigidity of the table 3 is increased, the deformation can be prevented, but the mass of the table 3 is also increased and the thrust of the linear motor 4 must be further increased. become.

An object of the present invention is to solve the above problems and to provide a linear moving device capable of increasing the thrust of a linear motor without changing the rigidity of a moving body.

[0015]

The above object is achieved by the following linear moving devices.

According to the first aspect of the present invention, a moving body (3) having an object supporting surface (3a) for supporting an object is formed on a base (10).
A linear guide device (2) for supporting the movable body (3) so as to be capable of linearly reciprocating; and a linear motor for moving the movable body (3).
A frame body (32) provided at least and having at least one pair of opposed inner surfaces (32a) (32b);
And a pair of inner surfaces (32) of the frame (32).
a) A pillar (33) located between (32b), one inner surface (32a) of the frame (32) and one inner surface (3
Outer surface (33a) of said columnar body (33) facing 2a)
And a first linear motor (30) having a coil (30a) provided on one of the above and a magnet (30b) provided on the other, and the other inner surface (32b) of the frame (32). A coil (31a) provided on one of the outer surface (33b) of the columnar body (33) facing the other inner surface (32b), and a magnet (31b) provided on the other. 2 linear motors (31)
And the frame body (32) and the columnar body (33)
Are disposed in parallel with the linear guide means (2), and
The inner surfaces (32a) and (32b) of the frame (32) and the outer surfaces (33a) and (33b) of the columnar body (33) extend in a direction orthogonal to the object support surface (3a) of the moving body (3). It is characterized by facing.

(Operation) The moving body (3) is linearly moved on the base (10) by the linear guide means (2) by the thrust of the pair of linear motors (30) and (31). Since the pair of linear motors (30) and (31) are arranged in a direction parallel to the object support surface (3a) of the moving body (3), the coils (30a) and (31a) and the magnets (30b) and (31)
The suction force with b) is cancelled, and the moving body (3) is not deformed.

According to a second aspect of the present invention, the frame (32) is a rectangular cylinder having a rectangular cross section, the columnar body (33) is a rectangular columnar body having a rectangular cross section, and the moving body (3). A pair of inner surfaces (32) of the frame (32) parallel to the object support surface (3a)
c) (32d) and a pair of outer surfaces (33c) (33) of the columnar body (33) facing the inner surfaces (32c) (32d).
and d) at least one of which is provided with linear guide means (34) for guiding the frame body (32) and the columnar body (33) so as to be able to linearly reciprocate with each other.

(Operation) The frame (32) is smoothly moved relative to the base (10) by being guided by the linear guide means (34).

According to a third aspect of the present invention, the first and second linear motors (30) and (3) are connected to the moving body (3) by the connecting means (35) formed of an elastic body.
It is characterized by being provided movably in the arrangement direction of 1).

(Operation) The frame (32) is a linear motor (3).
0) Even if the position shifts due to the suction force of (31), the shift is allowed by the elastic deformation of the connecting means (35). Therefore, the moving body (3)
Moves smoothly without receiving unnecessary external force.

According to a fourth aspect of the present invention, the connecting means includes the moving body (3), the frame (32) and the columnar body (33).
And the first and second linear motors (30) (3)
The first and second linear motors (30) are provided by linear guide means for guiding linearly reciprocating movement in the arrangement direction of (1).
It is characterized by being provided so as to be movable in the arrangement direction of (31).

The reference numerals in parentheses are for comparison with the drawings, and do not limit the configuration of the present invention.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a front sectional view of a table portion of a printed circuit board drilling machine provided with a linear movement guide device according to an embodiment of the present invention. FIG. 2 is an external view of the linear motor unit. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted.

The pair of linear motors 30, 31 includes coils 30a, 31a and magnets 30b, 31b, and are arranged in the Y direction. The rated outputs of both motors 30 and 31 are the same. Each coil 30a, 31
a is fixed to a pair of opposed inner surfaces 32a and 32b of a cylindrical housing 32 having a square cross section. The magnets 30b and 31b are fixed to right and left side surfaces 33a and 33b of a prism 33 having a square cross section.

The prism 33 has legs 3 formed at both ends such that the right and left side surfaces 33a and 33b are parallel to the track 2a.
6 and 36 are fixed to a concave portion 1 a formed in the base 1. The pair of linear guide devices 34 includes a track 34a and a bearing 34b. Each track 34a, 34
a is a track 2a on the upper surface 33c and the lower surface 33d of the prism 33.
It is fixed in parallel with. Each bearing 34b, 34b
Are the coil 30a, the magnet 30b and the coil 31
a and the inner surface 32d of the housing 32 so that the distance between the upper surface 32a and the magnet 31b is equal.
It is fixed to.

The housing 32 is connected to the lower surface of the table 3 by a pair of joints 35 having an L-shaped cross section. The joint 35 is formed of a metal plate having elasticity, and has a spring constant of about 5 μm / 1 in the X direction.
000 kg, spring constant in Y and Z directions is about 50μ
m / 10 kg. That is, the joint 35
It is easy to bend in the direction and the Z direction.

The linear movement guide device 28 includes the linear guide device 2
Linear motors 30 and 31, a linear guide device 34,
It is composed of a joint 35 and the like.

Next, the operation will be described.

A predetermined current is applied to the coils 30a and 31a to generate a magnetic field, and the housing 32 is moved in the X direction by the magnetic force acting between the magnets 30b and 31b.
At this time, since the electromagnetic force by the pair of linear motors 30 and 31 is in the Y direction, the attraction force is canceled and the table 3
Is not deformed. Also, the magnets 30b, 31
Since it is difficult to manufacture a magnet having a large area, b is formed by arranging many magnets having a small area instead of one.

For this reason, the surface heights of the magnets 30b and 31b are not uniform and have irregularities of about 0.1 mm.
Further, although slightly, the characteristics of each magnet are different. Therefore, the coil 30a and the magnet 3
0b and the Y-direction electromagnetic force F2 acting between the coil 31a and the magnet 31b may be different depending on the position of the housing 32.
In some cases, a force of about 100 kg may be applied to one side in the Y direction. In such a case, the ball of the bearing 34b is elastically deformed, and the housing 32 is shifted by several tens of μm in the Y direction. In the present embodiment, since the housing 32 is connected to the table 3 via the elastic joint 35, only the housing 32 moves in the Y direction, and the table 3 does not move in the Y direction.

Therefore, the processing accuracy of the printed board drilling machine 29 does not decrease. Also, since the joint 35 has a large spring constant in the X direction, the position of the table 3 does not shift even when the acceleration applied to the table 3 is large.

In place of the joint 35 made of an elastic member, for example, a track constituting a linear guide device is arranged in the Y direction on the lower surface of the table 3 and the bearing is mounted on the housing 3.
2, the housing 32 may have a degree of freedom in the Y direction.

The coils 3 of the linear motors 30 and 31
0a, 31a to the housing 32, the magnet 30b,
31 b may be arranged on the prism 33. Further, the coil 30a (31a) of one of the linear motors 30 (31) is placed in the housing 32, and the magnet 30b (31b) is placed in the prism 3.
3, the coil 31a of the other linear motor 31 (30)
(30a) to prism 33, magnet 31b (30b)
May be provided in the housing 32.

Further, the housing 32 is provided on the bed 1,
The prism 33 may be provided on the table 3.

Further, although the housing 32 is formed in a tubular shape having a square cross section, the housing 32 has an inverted U-shaped cross section or a U-shaped cross section.
It may be formed in a character shape. In this case, only one linear guide device 34 can be provided, but the prism 33 can be easily incorporated into the housing.

In the present invention, the numerical values shown are shown for reference in order to facilitate understanding of the contents of the present invention, and the present invention is not limited to these numerical values.

[0039]

According to the present invention, a pair of linear motors for moving the moving body is provided in a direction parallel to the object supporting surface of the moving body, and the attraction between the coil and the magnet is parallel to the object supporting surface. In this case, even when the thrust of the linear motor is increased, the deformation of the moving body can be prevented without increasing the strength of the moving body. Also, when the thrust of the linear motor increases, the moving body can be moved quickly.

Further, for example, in a machine such as a printed circuit board punching machine, which is required to punch holes accurately without being displaced to a predetermined position on a printed circuit board, a driving device for a table on which a printed circuit board is set is provided. With the use of the linear moving device of the present invention, it is possible to prevent the table from being deformed and accurately drill holes at predetermined positions on the printed circuit board. Further, since the table can be quickly moved, the efficiency of the drilling operation is improved, and the productivity of the printed circuit board can be increased.

If the frame is provided on the moving body by the connecting means so as to be movable in the arrangement direction of the pair of linear motors, the frame may be displaced by the suction force of the linear motor. Also, the displacement is allowed by the connecting means, and the moving body can be moved smoothly without applying unnecessary external force to the moving body.

[Brief description of the drawings]

FIG. 1 is a front partial cross-sectional view of a table section of a printed circuit board drilling machine provided with a linear moving device according to an embodiment of the present invention.

FIG. 2 is an external perspective view of the linear moving device according to the embodiment of the present invention.

FIG. 3 is an external perspective view of a printed circuit board drilling machine provided with a conventional linear moving device.

FIG. 4 is a sectional view taken along the line AA in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bed 2 Linear guide device (linear guide means) 2a Track 2b Bearing 3 Table (moving body) 3a Board support surface (object support surface) 5 Printed circuit board (object) 10 Base 11 Column 28 Linear transfer device 29 Printed board drilling machine 30 Linear motor 30a Coil 30b Magnet 31 Linear motor 31a Coil 31b Magnet 32 Housing (frame) 32a Right inner surface (inner surface) 32b Left inner surface (inner surface) 32c Upper inner surface (inner surface) 32d Lower inner surface (inner surface) 33 prism (pillar) 33a Right side (outer surface) 33b Left side (outer surface) 33c Upper surface (outer surface) 33d Lower surface (outer surface) 34 Linear guide device 34a Track 34b Bearing 35 Joint

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 17, 1998 (1998.9.1)
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

However, when the thrust of the linear motor 4 is increased, the iron core combined with the coil 4a increases, and
Since the suction force of the gnet 4b also increases , the table 3 is depressed by δ as shown by the dotted line in FIG. When the table 3 is deformed, the substrate 5 tilts, and it becomes impossible to accurately drill holes at predetermined positions, and the quality of the substrate deteriorates.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

A predetermined current is applied to the coils 30a and 31a to generate a magnetic field, and the housing 32 is moved in the X direction by the magnetic force acting between the magnets 30b and 31b.
At this time, since the suction force by the pair of linear motors 30 and 31 is in the Y direction, the suction force is canceled and the table 3
Is not deformed. Also, the magnets 30b, 31
Since it is difficult to manufacture a magnet having a large area, b is formed by arranging many magnets having a small area instead of one.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

For this reason, the surface heights of the magnets 30b and 31b are not uniform and have irregularities of about 0.1 mm.
Further, although slightly, the characteristics of each magnet are different. Therefore, the coil 30a and the magnet 3
A suction force F1 in the Y direction acting between 0b, attraction force F2 of the Y-direction acting between the coil 31a and the magnet 31b may be different depending on the position of the housing 32, the housing 32
In some cases, a force of about 100 kg may be applied to one side in the Y direction. In such a case, the ball of the bearing 34b is elastically deformed, and the housing 32 is shifted by several tens of μm in the Y direction. In the present embodiment, since the housing 32 is connected to the table 3 via the elastic joint 35, only the housing 32 moves in the Y direction, and the table 3 does not move in the Y direction.

Continued on the front page (72) Inventor Akira Irie 2100 Kamimaizumi, Ebina-shi, Kanagawa F-term in Hitachi Seiko Co., Ltd. 5H641 BB06 BB10 GG02 HH03 JA00 JA03 JA09

Claims (4)

[Claims] 1. A linear guide means for supporting a moving body on which an object supporting surface for supporting an object is formed so as to be able to linearly reciprocate with respect to a base; a linear motor for moving the moving body;
A linear moving device comprising:
A frame body having a pair, a columnar body provided on the base body and positioned between a pair of inner surfaces of the frame body, one inner surface of the frame body and an outer surface of the columnar body facing the one inner surface. A first linear motor having a coil provided on any one of the above, and a magnet provided on the other, and any one of the other inner surface of the frame body and the outer surface of the columnar body facing the other inner surface. A second linear motor having a coil provided on one side and a magnet provided on the other side, wherein the frame and the columnar body are arranged in parallel to the linear guide means, and Wherein the inner surface of the frame and the outer surface of the column are oriented in a direction orthogonal to the object support surface of the moving body. 2. The frame body is a rectangular cylinder having a square cross section,
The columnar body is a rectangular columnar body having a rectangular cross section, and at least one pair of inner surfaces of the frame parallel to the object support surface of the moving body and a pair of outer surfaces of the columnar body facing the inner surface. The linear movement device according to claim 1, further comprising a linear guide means for guiding the frame body and the columnar body so as to be able to linearly reciprocate with each other. 3. The moving body according to claim 1, wherein the frame is provided on the moving body so as to be movable in a direction in which the first and second linear motors are arranged by connecting means made of an elastic body. Linear moving device. 4. The linear body, wherein the frame body guides the movable body to the moving body by linear guide means for guiding the frame body and the columnar body so as to be able to linearly reciprocate in the arrangement direction of the first and second linear motors. The linear movement device according to claim 1, wherein the linear movement device is provided so as to be movable in an arrangement direction.