JP3850555B2 - Linear movement device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a linear movement device suitable for moving a table of a printed circuit board drilling machine, for example.
[0002]
[Prior art]
Conventionally, the linear moving device is incorporated in, for example, a printed circuit board drilling machine shown in FIG. 4 is a cross-sectional view taken along line AA in FIG.
[0003]
A bed 3 is provided with a table 3 that 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 fixed to the bed 1 and the bearing 2b is fixed to the table 3. The X-axis linear motor 4 includes a coil 4a and a magnet 4b. The coil 4a is fixed to the table 3, and the magnet 4b is fixed to the bed 1, respectively. In addition, since it is difficult to manufacture the magnet 4b with a large area, the magnet 4b is not one piece, but many magnets 4b with a small area are arranged side by side. A plurality of printed circuit boards (hereinafter simply referred to as “substrates”) 5 are fixed at predetermined positions on a substrate support surface 3 a of the table 3.
[0004]
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, and guides the movement of bearings (not shown) fixed to the back surface of the saddle 13, and a linear guide device for the saddle (without reference numeral) is provided with this bearing. It is composed.
[0005]
The magnet 14 is fixed to the column 11 in the left-right direction, and a coil (not shown) fixed to the back surface of the saddle 13 constitutes a Y-axis linear motor (no reference symbol). The track 16 is fixed to the saddle 13 in the vertical direction and guides the movement of a bearing (not shown) fixed to the back surface of the plate 17, and forms a linear guide device for the plate (without reference numerals) with this bearing. is doing.
[0006]
The ball screw 18 is engaged with a nut (not shown) fixed on the back surface of the plate 17 in the vertical direction, and is rotated by a motor 15 on the saddle 13 to raise and lower the plate 17. 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 movement device 6 includes a linear guide device 2 and a linear motor 4.
[0008]
Next, the operation of the printed circuit board drilling machine will be described.
[0009]
A control device (not shown) operates the X-axis linear motor 4 and the Y-axis linear motor (motor having a magnet 14) in accordance with a machining program 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, by operating the motor 15, the plate 17 is lowered to a predetermined position, a hole is made in the substrate 5, and the plate 17 is raised.
[0010]
In this way, for example, when the moving stroke of the table 3 is 1 m, the printed circuit board punching machine keeps the running accuracy (position accuracy of the table 3 in the moving range) within 5 μm and accurately sets the hole at a predetermined position. Can dawn.
[0011]
[Problems to be solved by the invention]
In order to increase the processing speed, it is necessary to increase the moving speed of the table 3.
[0012]
However, when the thrust of the linear motor 4 is increased, the iron core combined with the coil 4a is increased and the attractive force of the magnet 4b is also increased , so that the table 3 is recessed by δ as shown by the dotted line in FIG. When the table 3 is deformed, the substrate 5 is tilted, and the hole cannot be accurately opened at a predetermined position, so that the quality of the substrate is lowered.
[0013]
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 increased accordingly, and the vicious circle in which the thrust of the linear motor 4 has to be further increased is repeated.
[0014]
An object of the present invention is to solve the above-mentioned problems and to provide a linear moving device that can increase the thrust of a linear motor without changing the rigidity of a moving body.
[0015]
[Means for Solving the Problems]
Said subject is solved by each following linear movement apparatus.
[0016]
The first aspect of the present invention is the linear guide means (2) for supporting the movable body (3) on which the object support surface (3a) for supporting the object is formed so as to be linearly reciprocable with respect to the base (10), In a linear moving device comprising a linear motor for moving the moving body (3),
A frame (32) provided on the movable body (3) and having at least one pair of opposed inner surfaces (32a) and (32b);
A columnar body (33) provided on the base body (10) and positioned between a pair of inner surfaces (32a) (32b) of the frame (32);
Connecting means (35) for connecting the frame to the moving body ,
The linear motor is
A coil (30a) provided on one of the inner surface (32a) of the frame (32) and the outer surface (33a) of the columnar body (33) facing the one inner surface (32a); A first linear motor (30) having a magnet (30b) provided on the other side;
A coil (31a) provided on one of the other inner surface (32b) of the frame (32) and the outer surface (33b) of the columnar body (33) facing the other inner surface (32b); a second linear motor having a magnet (31b) provided on the other (31), consists,
The frame (32) before Symbol columnar body (33), but the disposed in parallel to the linear guide means (2), and wherein the inner surface (32a) (32 b) columnar said frame (32) The outer surfaces (33a) and (33b) of the body (33) are arranged so as to face in a direction orthogonal to the object support surface (3a) of the movable body (3) ,
The connecting means (35) moves the frame (32) integrally with the movable body (3) in the arrangement direction of the first and second linear motors (30) (31), and the inner surface. (32a) (32b) are connected so as to allow movement in a direction orthogonal to the direction,
It is in the linear movement apparatus characterized by this.
[0017]
(Function)
The moving body (3) is linearly moved on the base (10) by the linear guiding 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) (31a) and the magnets (30b) (31b) And the moving body (3) is not deformed.
[0018]
The invention according to claim 2 is that the frame (32) is a rectangular cylinder having a rectangular cross section, the columnar body (33) is a rectangular column having a rectangular cross section, and the object support of the movable body (3). A pair of inner surfaces (32c) (32d) of the frame (32) parallel to the surface (3a) and a pair of outer surfaces (33c) of the columnar body (33) facing the inner surfaces (32c) (32d) ) (33d), linear guide means (34) for guiding the frame (32) and the columnar body (33) so as to be capable of linear reciprocation is provided.
[0019]
(Function)
The frame (32) is smoothly guided by the linear guide means (34) with respect to the base (10).
[0020]
According to a third aspect of the present invention, the connecting means moves the frame (32) integrally with the movable body (3) in the arrangement direction of the first and second linear motors (31) (32). And it is an elastic body (35) connected so that the movement of the direction orthogonal to the said inner surface (32a, 32b) is accept | permitted, It is characterized by the above-mentioned.
[0021]
(Function)
Even if the frame (32) receives the suction force of the linear motors (30) and (31) and the position may shift, the connecting means (35) is elastically deformed to allow the deviation. . Therefore, the moving body (3) moves smoothly without receiving unnecessary external force.
[0022]
According to a fourth aspect of the present invention, the connecting means is disposed between the movable body and the frame body, moves integrally in the arrangement direction of the first and second linear motors, and is orthogonal to the inner surface. It is a linear guide means that allows movement in a direction.
[0023]
In addition, the code | symbol in the said parenthesis contrasts with drawing, Comprising: The structure of this invention is not limited at all.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
In the following, the present invention will be described with reference to FIG. 1 and FIG.
[0025]
FIG. 1 is a front cross-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. The same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and the description thereof is omitted.
[0026]
The pair of linear motors 30 and 31 are composed of coils 30a and 31a and magnets 30b and 31b, and are arranged in the Y direction. The rated outputs of both motors 30 and 31 are the same. The coils 30a and 31a are 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 the left and right side surfaces 33a and 33b of the rectangular column 33 having a square cross section.
[0027]
In the prism 33, leg portions 36, 36 formed at both ends are fixed to a recess 1a formed in the base 1 so that right and left side surfaces 33a, 33b are parallel to the track 2a.
The pair of linear guide devices 34 includes a track 34a and a bearing 34b. Each track 34a, 34a is fixed to the upper surface 33c and the lower surface 33d of the prism 33 in parallel with the track 2a. The bearings 34b and 34b are fixed to the upper inner surface 32c and the lower inner surface 32d of the housing 32 so that the intervals between the coil 30a and the magnet 30b and the coil 31a and the magnet 31b are equal.
[0028]
The housing 32 is connected to the lower surface of the table 3 by a pair of joints 35 and 35 having an L-shaped cross section. The joint 35 is formed of a member having elasticity on a metal plate, the spring constant in the X direction is about 5 μm / 1000 kg, and the spring constant in the Y direction and the Z direction is about 50 μm / 10 kg. That is, the joint 35 moves integrally in the X direction, which is the arrangement direction of the linear motors 30 and 31, and is easily bent in the Y direction and the Z direction.
[0029]
The linear movement guide device 28 includes the linear guide device 2, linear motors 30 and 31, a linear guide device 34, a joint 35, and the like.
[0030]
Next, the operation will be described.
[0031]
A predetermined current is passed through the coils 30a and 31a to generate a magnetic field, and the housing 32 is moved in the X direction by a magnetic force acting between the magnets 30b and 31b. At this time, the suction force due to a pair of linear motors 30 and 31 is the Y direction, and the suction force is canceled, the table 3 is not deformed. In addition, since it is difficult to manufacture a magnet having a large area, the magnets 30b and 31b are formed by arranging a large number of magnets having a small area instead of one.
[0032]
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. For this reason, the attractive force F1 in the Y direction acting between the coil 30a and the magnet 30b and the attractive force F2 in the Y direction acting between the coil 31a and the magnet 31b may differ depending on the position of the housing 32. On the other hand, a force of about 100 kg may be applied. In such a case, the ball of the bearing 34b is elastically deformed, and the housing 32 is displaced in the Y direction by several tens of μm. Since the housing 32 in the present embodiment is connected to the table 3 via the joint 35 having elasticity, only the housing 32 moves in the Y direction, and the table 3 does not move in the Y direction.
[0033]
For this reason, the processing accuracy of the printed circuit board punching machine 29 is not lowered. Further, 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.
[0034]
In place of the joint 35 made of an elastic member, for example, the track constituting the linear guide device is arranged in the Y direction on the lower surface of the table 3, and the bearing is provided in the housing 32, so that the degree of freedom of the housing 32 in the Y direction is increased. You may have it.
[0035]
Further, the coils 30 a and 31 a of the linear motors 30 and 31 may be arranged in the housing 32, and the magnets 30 b and 31 b may be arranged in the prism 33. Furthermore, the coil 30a (31a) of one linear motor 30 (31) is used as the housing 32, the magnet 30b (31b) is used as the prism 33, and the coil 31a (30a) of the other linear motor 31 (30) is used as the prism 33. The magnet 31b (30b) may be provided in the housing 32.
[0036]
Further, the housing 32 may be provided on the bed 1 and the prisms 33 may be provided on the table 3.
[0037]
Further, the housing 32 is formed in a cylindrical shape having a square cross section, but may be formed in an inverted U-shaped cross section or a U-shaped cross section. In this case, only one of the linear guide devices 34 can be provided, but the prisms 33 can be easily incorporated into the housing.
[0038]
In the present invention, the numerical values shown are shown for reference in order to make the contents of the invention easy to understand, and are not limited thereto.
[0039]
【The invention's effect】
According to the present invention, a pair of linear motors for moving the moving body is disposed in a direction parallel to the object supporting surface of the moving body so that the attractive force between the coil and the magnet is parallel to the object supporting surface and cancels out. Therefore, even if 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. Further, when the thrust of the linear motor is increased, the moving body can be moved quickly.
[0040]
Furthermore, in a machine that has to drill holes accurately without shifting to a predetermined position of the printed circuit board, such as a printed circuit board drilling machine, the present invention is applied to a table driving device on which the printed circuit board is set. When the linear moving device is used, it is possible to prevent the table from being deformed and accurately open the hole at a predetermined position on the printed circuit board. Further, since the table can be moved quickly, the efficiency of drilling work can be improved and the productivity of the printed circuit board can be increased.
[0041]
If the frame is provided on the moving body by connecting means so that it can move in the direction of the pair of linear motors, even if the position of the frame may be shifted due to the suction force of the linear motor, The shift is allowed by the means, and the moving body can be smoothly moved without applying unnecessary external force to the moving body.
[Brief description of the drawings]
FIG. 1 is a partial front sectional view of a table portion 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 a linear moving device according to an embodiment of the present invention.
FIG. 3 is an external perspective view of a printed circuit board drilling machine equipped with a conventional linear movement device.
4 is a cross-sectional view taken along the line AA in FIG. 3;
[Explanation of symbols]
1 bed 2 linear guide device (straight guide means)
2a Track 2b Bearing 3 Table (moving body)
3a Substrate support surface (object support surface)
5 Printed circuit board (object)
DESCRIPTION OF SYMBOLS 10 Substrate 11 Column 28 Linear movement device 29 Printed circuit board drilling machine 30 Linear motor 30a Coil 30b Magnet 31 Linear motor 31a Coil 31b Magnet 32 Housing (frame body)
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 prismatic column
33a Right side (outside)
33b Left side (outside)
33c Upper surface (outer surface)
33d Lower surface (outer surface)
34 Linear guide device 34a Track 34b Bearing 35 Joint

Claims (4)

In a linear movement device comprising linear guide means for supporting a movable body on which an object support surface for supporting an object is formed so as to be capable of linear reciprocation relative to a base, and a linear motor for moving the movable body,
A frame provided on the moving body and having at least one pair of opposing inner surfaces;
A columnar body provided on the base body and positioned between a pair of inner surfaces of the frame;
Connecting means for connecting the frame to the moving body ,
The linear motor is
A first linear motor having a coil provided on one of the inner surface of the frame and the outer surface of the columnar body facing the one inner surface, and a magnet provided on the other;
A coil provided on one of the outer surface of the columnar body facing the other of the inner and said other inner surface of the frame body, and a second linear motor having a magnet provided on the other, consists ,
And the frame body and the front Symbol columnar bodies, the are arranged in parallel to the linear guide means, and the inner surface of the frame and the outer surface of the columnar body, in a direction perpendicular to the object support surface of the movable body Arranged to face
The connecting means is connected to the moving body so that the frame is integrally moved in the arrangement direction of the first and second linear motors and allowed to move in a direction perpendicular to the inner surface. ,
A linear movement device characterized by that. The frame body is a square cylinder having a square cross section, the columnar body is a square columnar body having a square cross section, a pair of inner surfaces of the frame body parallel to the object support surface of the moving body, and the inner surface A linear guide means for guiding the frame body and the columnar body so as to be capable of linear reciprocating movement between at least one of the pair of outer surfaces of the columnar body facing each other;
The linear moving device according to claim 1. An elastic body in which the coupling means couples the frame body to the moving body so as to integrally move in the arrangement direction of the first and second linear motors and allow movement in a direction perpendicular to the inner surface. Is,
The linear movement apparatus of Claim 1 or 2. The connecting means is disposed between the moving body and the frame body, moves integrally in the arrangement direction of the first and second linear motors, and allows movement in a direction perpendicular to the inner surface. A guide means,
The linear movement apparatus of Claim 1 or 2.

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