JP2002096298A - Printed board working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed board working machine of excellent working efficiency and machining accuracy which is capable of reducing the running cost. SOLUTION: A straight guide device 19 comprising a cylindrical roller 19a and a retainer 19b for rotatably supporting the cylindrical roller 19a is disposed between a housing 20 integrated with a spindle 17 and a carriage 15. A pin 25 is provided in the center of the longitudinal direction of the retainer 19b, and springs 21 and 22 for urging the pin 25 are disposed on the housing 20. By constantly urging the pin 25 by the springs 21 and 22, the straight guide device 19 is adjusted in position with respect to the housing 20 and a carriage 15, and any deviation can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board processing machine for processing by horizontally positioning a spindle for rotatably holding a tool by a carriage and moving the spindle in the axial direction of the tool.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a main part of a first spindle device in a conventional printed circuit board processing machine.

In FIG. 1, a spindle 17 is fixed to a carriage 15. Inside the spindle 17,
An electric motor (not shown) is provided, and rotates the drill 16 held at the tip. The carriage 15 is vertically guided by a guide bar 52 via a guide bearing 51. Both ends of the guide bar 51 are fixed to the cross slide 11 via a support plate 53.
The cross slide 11 is movable in a direction perpendicular to the paper surface. The nut 53 fixed to the carriage 15 is screwed to the ball screw 13. The ball screw 13 is driven to rotate by a motor 14 fixed to the cross slide 11.

Then, the motor 14 is operated to rotate the ball screw 13 so that the carriage 15, that is, the drill 16 is moved up and down.

FIG. 6 is a sectional view showing a main part of a second spindle device in a conventional printed circuit board processing machine.
The same components as those described above or components having the same functions are denoted by the same reference numerals, and description thereof is omitted.

The spindle 17 is positioned horizontally by an air bearing 61 provided on the carriage 15 and is movable vertically.

[0007]

In the case of the first prior art, since the rigidity of the guide bar 51 can be increased, the axis of the hole processed by the drill 16 becomes vertical, and a high quality hole can be processed. . However, College 15
Since the spindle 17 is moved up and down by moving up and down, the weight of the movable part increases, and the capacity of the motor 14 needs to be increased. Further, the processing speed could not be increased.

On the other hand, in the case of the second prior art, since only the spindle 17 is moved up and down, not only the capacity of the motor 14 can be reduced, but also the processing speed can be increased.
However, due to low rigidity, the axis of the machined hole is tilted,
Hole quality decreased. In addition, the use of air increases running costs.

An object of the present invention is to solve the above-mentioned problems in the prior art, and to provide a printed circuit board processing machine which is excellent in work efficiency and processing accuracy and can reduce running cost.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method in which a spindle for rotatably holding a tool is horizontally positioned by a carriage, and the spindle is moved in an axial direction of the tool. In a printed circuit board processing machine for processing, the spindle is supported on the carriage via a linear guide device including a rotating body and a retainer holding the rotating body.

In this case, it is possible to provide the elastic member twice as many as the number of the retainers, and to urge the retainer in the axial direction by reversing the urging direction of the elastic member.

Further, a receiving member is fixed to the retainer,
The receiving member can be urged by the elastic member.

Further, it is possible to provide four elastic members as many as the number of the retainers, and to urge the retainer in the axial direction by reversing the urging directions of the two pairs of the elastic members.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 is a perspective view of a printed circuit board processing machine according to the present invention. Components having the same functions or the same functions as those in FIG. In the figure, a printed board 1 is fixed to a table 2. Table 2
Is movable in the front-rear (X) direction on a pair of linear guide devices 4 fixed to the bed 3. The motor 5 positions the table 2 in the X direction.

A gate-shaped cross rail 7 straddles the table 2 and is fixed to the bed 3. Cross slide 11
Is a pair of linear guide devices 8 fixed to the cross rail 7
The upper part is movable in the left and right (Y) direction. The motor 10 and the ball screw 9 position the cross slide 11 in the Y direction.

A motor 14 and a carriage 15 are fixed to the cross slide 11. In College 15,
A spindle 17 is supported movably in the vertical (Z) direction. A nut (not shown) held on the spindle 17 is screwed into the ball screw 13. The control device 18 controls the operation of each unit.

FIG. 2 is a cross-sectional view of the carriage 15 taken along the axis O of rotation of the drill 16. The left side of the axis O indicates the case where the spindle 17 is at the reference position, and the right side of the axis O indicates the case where the spindle 17 is the reference position. It shows a case in which it is lowered by L from the position. FIG. 3 is a sectional view taken along line AA in FIG.

A housing 20 having a rectangular cross section is fixed to the outer periphery of the spindle 17. The carriage 15 is formed with a hole 15 a similar in shape to the housing 20. A linear guide device 19 is arranged between the outer surface 20a of the housing 20 and the inner surface 15n of the hole 15a. The linear guide device 19 includes a cylindrical roller 19a and a cylindrical roller 1
And a holding plate (retainer) 19b that rotatably supports 9a. The cylindrical roller 19a is in contact with the outer surface 20a and the inner surface 15n. A pin 25 is fixed to the center of the retainer 19b in the vertical direction. A groove 15b is provided on the inner surface 15n facing the pin 25. Groove 15
b communicates with a hole 15c whose axis is parallel to the axis O.
A plug 30 is screwed above and below the hole 15c. Springs 21 and 22 are arranged between the pin 25 and the upper and lower plugs 30, respectively. The specifications of the springs 21 and 22 are the same, the spring constant is k, the free length is (M + m), and is longer than the distance M between the pin 25 and the plug 30 by m. That is, when the spindle 1 is at the reference position, the springs 21, 2
2 is a state compressed by m, and urges the pin 25 with a force of km.

Next, the operation of this embodiment will be described.

When the spindle 17 is moved downward by L from the reference position (the center position of the movement range), the linear guide device 19 is moved downward by L / 2.

As is well known, cylindrical rollers 19a
In the case of the linear guide device 19 composed of the
When the movement is repeated, the housing 20 of the linear guide device 19
Alternatively, the position with respect to the carriage 15 may be shifted.

That is, when the spindle 17 is moved by L, the cylindrical roller 19a and the outer surface 17a or the inner surface 1
If there is no slip between 5n, the retainer moves by L / 2. However, since a slight slip actually occurs, the deviation becomes remarkable during repeated movements.

However, according to the present invention, the following operation is performed, so that the above-described shift does not occur.

That is, the cylindrical roller 19a and the outer surface 1
7a or the inner surface 15n slips by Δz,
It is assumed that the linear guide device 19 is shifted downward by Δz with respect to the housing 20 in the drawing. Then, the spring 22 urges the pin 25 upward with a force of k (m + Δz). On the other hand, since the spring 21 is extended, the pin 25 is urged downward by a force of k (m−Δz). As a result, the pin 25 becomes 2 kΔz
When the linear guide device 19 returns to the reference position, the pin 25 returns to the center position.

That is, the position of the linear guide device 19 is always corrected each time it returns to the reference position, and no displacement occurs with respect to the housing 20 and the carriage 15.

The pins 21 are not provided, and the springs 21 and 22 are not provided.
May be arranged at both ends of the retainer 19b.

Further, as shown in FIG.
May be arranged on both sides of the pin 25. By arranging the springs 21 and 22 on both sides of the pin 25 in this way, the pin 25 can always be kept horizontal.
There is no risk that the 22 will tilt, and the operation can be further stabilized.

In the above description, the spring constants of the springs 21 and 22 and the free length have been described as being the same, but different values may be used as long as they are balanced at the reference position.

The springs 21 and 22 are not limited to coil springs, but may have other shapes and materials.

The cross section of the housing 20 is not limited to a quadrangle but may be a polygon.

[0032]

As described above, according to the present invention,
In a printed circuit board processing machine in which a spindle for rotatably holding a tool is horizontally positioned by a carriage and the spindle is moved in an axial direction of the tool to perform processing, the spindle is held by a rotating body and the rotating body. Since the carriage is supported by the carriage via a linear guide device including a retainer, the weight of the movable portion can be reduced, and the work efficiency can be improved. Also,
Since the rigidity is high, the processing accuracy can be improved. Also, since no air is used, running costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a printed circuit board processing machine according to the present invention.

FIG. 2 is a sectional view of a carriage according to the present invention.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a modified example of the printed board processing machine according to the present invention.

FIG. 5 is an explanatory diagram of a conventional technique.

FIG. 6 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 15 Carriage 17 Spindle 19 Linear Guide 19a Cylindrical Roller 19b Retainer 20 Housing 21, 22 Spring 25 Pin

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tamio Otani 2100 Kamiimaizumi, Ebina-shi, Kanagawa F-term in Hitachi Via Mechanics Co., Ltd. 3C036 AA01 GG07 3C060 AA11 BA05 BG20

Claims (4)

[Claims] 1. A printed circuit board processing machine for processing a workpiece by horizontally positioning a spindle for rotatably holding a tool by a carriage and moving the spindle in an axial direction of the tool. A printed board processing machine characterized by being supported on the carriage via a linear guide device comprising a retainer for holding the rotating body. 2. The retainer according to claim 1, wherein the number of the elastic members is twice the number of the retainers, and the urging direction of the elastic members is reversed to urge the retainer in the axial direction. Printed circuit board processing machine. 3. The printed circuit board processing machine according to claim 1, wherein a receiving member is fixed to the retainer, and the receiving member is urged by the elastic member. 4. An elastic member having four times the number of the retainers is provided, and the retainers are urged in the axial direction by reversing the urging directions of two pairs of the elastic members. The printed circuit board processing machine according to claim 1.