JP2003311581A - Printed wiring board processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printed wiring board processor not causing any reduction in the processing speed and being easy to maintain and inspect. <P>SOLUTION: A spindle 17 is supported in an integral structure by a housing 20 and can be freely moved upward or downward within the interior of a carriage 15 by a straight line guidance device 19, which is composed of a cylinder roller 19a and a holding plate 19b which supports the cylinder roller in a rotation-free manner. By forming a seal unit 70, consisting of a soft wiper 73, a dust wiper 74, and the like, on the upper side of the carriage 15, and by installing a lower cover 85, supporting the soft wiper 73 and dust wiper 74, on the lower side of the carriage 15, it is designed to prevent cut chips, etc., attached to the surface and other portions of the housing 20, from entering the interior of the carriage 15. <P>COPYRIGHT: (C)2004,JPO

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 positioning a spindle for rotatably holding a tool horizontally by a carriage and moving the spindle in the axial direction of the tool for processing.

[0002]

2. Description of the Related Art FIG. 6 is a cross-sectional view of essential parts showing a first spindle device in a conventional printed circuit board processing machine. In the figure, the spindle 17 is fixed to the carriage 15. An electric motor (not shown) is provided inside the spindle 17, and rotationally drives the drill 16 held at the tip. Carriage 15 is guide bearing 5
It is guided in the vertical direction by the guide bar 52 via 1. Both ends of the guide bar 51 are fixed to the cross slide 11 via support plates 53. The cross slide 11 is movable in a direction perpendicular to the paper surface. The nut 54 fixed to the carriage 15 is screwed onto the ball screw 13. The ball screw 13 is rotationally driven by a motor 14 fixed to the cross slide 11. And
The carriage 15 or the drill 16 is moved up and down by operating the motor 14 and rotating the ball screw 13.

FIG. 7 is a cross-sectional view of an essential part showing a second spindle device in a conventional printed circuit board processing machine.
Those having the same function as or having the same function as those in FIG. The spindle 17 is positioned horizontally by an air bearing 61 provided on the carriage 15, and is vertically movable.

In the former case, since the rigidity of the guide bar 51 can be increased, the axis of the machined hole becomes vertical, and a hole of excellent quality can be machined. However, since the spindle 17 is moved up and down by moving the carriage 15 up and down, the weight of the movable part is increased and the capacity of the motor 14 needs to be increased. Moreover, the processing speed could not be increased.

In the latter case, 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, since the rigidity was low, the axis of the machined hole was tilted and the quality of the hole deteriorated. Also, since air is used, the running cost is high.

In view of this, in Japanese Patent Laid-Open No. 2002-96298, a spindle for rotatably holding a tool is supported on a carriage through a linear guide device composed of a rotating body and a retainer for holding the rotating body, thereby improving work efficiency and The processing accuracy is improved and the running cost is reduced.

[0007]

However, Japanese Patent Application Laid-Open No. 2002-2002
In the case of the technique disclosed in Japanese Patent No. 96298, no consideration is given to protecting the linear guide device from dust. Usually, the printed circuit board processing machine is used in an environment where the room temperature is almost constant and there is little dust. Further, the processing dust and the like generated by the processing is discharged from the processing section to the outside by the dust suction device. However, it is not possible to completely remove the generated processing chips and the like. For this reason, the processing waste generated by the processing adheres to the linear guide device, which may reduce the processing speed. Further, there is a case where the linear guide device is damaged by the attached processing waste and the processing accuracy is deteriorated.

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 does not reduce the processing speed and is easy to inspect and maintain.

[0009]

In order to achieve the above object, the present invention provides a carriage for holding a tool rotatably through a linear guide device including a rotating body and a retainer holding the rotating body. In the printed circuit board processing machine for supporting and supporting the carriage in the horizontal direction and moving the spindle in the axial direction of the tool for processing, the carriage is provided with dustproof means and the linear guide device is externally provided. It is characterized by blocking from.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described based on the illustrated embodiments. FIG. 1 is a perspective view of a printed circuit board processing machine according to the present invention, and those having the same or same functions as those in FIG. In the figure, the printed circuit board 1 is fixed to a table 2. The table 2 is a pair of linear guides 4 fixed to the bed 3.
The top is movable in the front-back (X) direction. The motor 5 is
Position 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 top is movable in the left and right (Y) directions. 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. A spindle 17 is supported on the carriage 15 so as to be movable in the vertical (Z) direction. A nut (not shown) held by the spindle 17 is screwed onto 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. In addition, FIG.
2 is an enlarged view of part A in FIG. 2, and FIG. 4 is a plan view of the plate 71. A housing 20 having an octagonal cross section is fixed to the outer periphery of the spindle 17. Carrage 1
A hole 15a similar to the housing 20 is formed in the housing 5. 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 19a.
and a holding plate (retainer) 19b that rotatably supports a. The cylindrical roller 19a is in contact with the outer surface 20a and the inner surface 15n while being preloaded. 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. The groove 15b communicates with a hole 15c whose axis is parallel to the axis O.

Coil springs 21 and 22 are arranged between the pin 25 and the seal unit 70 and the lower cover 85, respectively. The specifications of the coil springs 21 and 22 are the same, the spring constant is k, and the free length is M + m, which is longer than the distance M between the pin 25 and the seal unit 70 and the lower cover 85 by m. That is, when the spindle 17 (ie the housing 20) is in the reference position, the springs 21, 22
Is in a state of being compressed by m and biases the pin 25 with a force of km.

A seal unit 70 is arranged at the upper end of the carriage 15. As shown in FIG. 3, the seal unit 70 includes a plate 71, a receiving plate 72, a soft wiper 73, a dust wiper 74, and an upper cover 75. As shown in FIG. 4, a circular grease groove 80 having an inner diameter substantially equal to the inscribed circle of the housing 20 and an outer diameter substantially equal to the circumscribed circle of the housing 20 is formed in the plate 71. Two grease supply holes 81 are arranged at positions symmetrical with respect to the axis O, and communicate the outer peripheral side of the plate 71 with the grease groove 80. Notches 82a and 82b are formed on the inner side surface of the grease groove 80. The notches 82a and 82b are formed so as to be aligned with the center of the linear guide device 19, and the area thereof is made larger as the distance from the grease supply hole 81 increases (that is, the area of the notch 82b is larger than the area of the notch 82a. Is also big). The plate 71 is fixed to the upper end of the carriage 15 by bolts (not shown). A grease nipple (not shown) is screwed into the grease supply hole 81.

The receiving plate 72 closes the grease groove 80 and prevents the soft wiper 73 from being deformed. A gap of about 0.1 mm is provided between the inner surface 72 a of the receiving plate 72 and the housing 20.

The soft wiper 73 is made of a felt-based material, and contains grease in advance. The inner surface 73a of the soft wiper 73 is formed so as to contact the housing 20 without a gap.

The dust wiper 74 is made of, for example, a fluororesin material, and a gap of 0.1 mm is provided between the inner surface 74a and the housing 20. The dust wiper 74 prevents the soft wiper 73 from being deformed, and
Prior to the soft wiper 73, it is possible to prevent machining scraps larger than 0.1 mm from entering the inside of the carriage 15. The upper cover 75 is attached via a bolt (not shown),
The receiving plate 72, the soft wiper 73, and the dust wiper 74 are collectively fixed to the plate 71.

A lower cover 85 is arranged at the lower end of the carriage 15. A circumferential groove is formed in two steps in the vertical direction on the inner diameter side of the lower cover 85. A soft wiper 73 is attached to the upper step (the side closer to the housing 20) and a dust wiper 74 is attached to the lower step. There is. The lower cover 85 is fixed to the lower end of the carriage 15 by bolts (not shown). An oil sump 85a is formed on the upper surface of the lower cover 85. A positioning hole 90 is formed on the side surface of the housing 20. Outside the positioning hole 90,
A screw hole 91 is formed. A filter unit 93 holding a filter 92 therein is screwed into the screw hole 91.

Next, the linear guide device 19 and the housing 20.
The procedure for incorporating the above into the carriage 15 will be described. The lower cover 85 is fixed to the carriage 15 in advance. As shown in FIG. 5, the positioning bar 100 is inserted into the positioning hole 90, and in this state, the linear guide device 19 is inserted into the hole 15a until the lower end 19a contacts the positioning bar 100. Next, the lower end of the housing 20 is brought into contact with the uppermost cylindrical roller 19a, and in this state, the positioning bar 10
0 is pulled out from the positioning hole 90. Then, the housing 20 is positioned at an appropriate position with respect to the carriage 15 together with the linear guide device 19 while being guided by the linear guide device 19. The upper end of the linear guide device 19 is provided with
The seal unit 70 is fixed to the carriage 15 in a state of being lowered from the upper end of the. Further, the filter unit 93 is screwed into the screw hole 91.

Next, the operation of this embodiment will be described. When the ball screw 13 is rotated by the motor 14, the housing 20 moves vertically with respect to the carriage 15. When the housing 20 descends, of the processing chips and the like attached to the outer periphery of the housing 20, large ones are removed by the dust wiper 74. In addition, the dust wiper 74
The processing scraps that have not been removed by the soft wiper 73
Is reliably removed by and does not enter the inside of the carriage 15. Further, the air in the space sandwiched between the housing 20 and the lower cover 85 passes through the groove 15b, the positioning hole 90 and the filter unit 93, and the carriage 15
Since it is discharged to the outside, the moving speed of the housing 20 does not decrease.

When the housing 20 moves up, large dust among the processing dust and the like adhering to the outer circumference of the housing 20 is removed by the dust wiper 74 arranged on the lower cover 85. Further, the processing scraps and the like which have not been removed by the dust wiper 74 are reliably removed by the soft wiper 73 and do not enter the inside of the carriage 15. Further, although a negative pressure is created in the space sandwiched between the housing 20 and the seal unit 70, the outside air is supplied to the inside of the carriage 15 through the positioning hole 90 and the filter unit 93. The movement speed does not decrease. The air supplied to the inside of the carriage 15 is supplied to the inside of the carriage 15 via the filter unit 93, so that the processing waste does not enter the inside of the carriage 15.

By the way, when the housing 20 (that is, the spindle 17) is moved downward from the reference position by L, the linear guide device 19 is moved downward by L / 2. As is well known, cylindrical roller 19a and retainer 19
In the case of the linear guide device 19 including b, if the movement is repeated, the position of the linear guide device 19 with respect to the housing 20 or the carriage 15 may shift. That is,
When the spindle 17 is moved by L, the cylindrical roller 19
If there is no slip between the a and the outer surface 17a or the inner surface 15n, the retainer moves by L / 2, but in reality, a slight slip occurs, so that the shift is usually remarkable as the movement is repeated.

However, in this embodiment, since the operation is as follows, the position of the linear guide device 19 does not shift. That is, it is assumed that a slip of Δz occurs between the cylindrical roller 19a and the outer surface 17a or the inner surface 15n, and the linear guide device 19 is displaced from the housing 20 by Δz downward in the drawing. In this case, the spring 22 is k (m + Δz)
Force the pin 25 upward. On the other hand, since the spring 21 extends, the force of k (m-Δz) urges the pin 25 downward. As a result, the pin 25 is urged upward by the force of 2 kΔz, and when the linear guide device 19 returns to the reference position, the pin 25
Returns to its original position.

As described above, the position of the linear guide device 19 is corrected every time the linear guide device 19 returns to the reference position, and the displacement with respect to the housing 20 and the carriage 15 does not occur. In this embodiment, since the positioning hole 90 for positioning the linear guide device 19 is also used as the air vent hole, the number of holes to be machined can be reduced.

Since the positioning hole 90 is provided, the work can be reliably and easily performed even when the user replaces the linear guide device 19, for example.

Furthermore, the plate 71 is provided with a grease groove 80, and the linear guide device 19 is provided through the notches 82a and 82b.
Since grease is supplied to the linear guide device, the number of grease supply points is much smaller than the number of linear guide devices 19, and maintenance work is easy. Note that the hole for bleeding air may not be shared with the positioning hole 90 and may be provided at another position.

[0027]

As described above, according to the present invention,
A spindle for rotatably holding a tool is supported by a carriage through a linear guide device composed of a rotating body and a retainer for holding the rotating body, the carriage is positioned in the horizontal direction, and the spindle is aligned with the axis of the tool. In the printed circuit board processing machine that moves in the direction to perform processing, the carriage is provided with the dustproof means and the linear guide device is shielded from the outside, so that the processing speed is not reduced. In addition, maintenance and inspection is easy.

[Brief description of drawings]

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

2 is a cross-sectional view of the carriage 15 taken along the axis O of rotation of the drill 16. FIG.

FIG. 3 is an enlarged view of part A in FIG.

FIG. 4 is a plan view of a plate 71.

FIG. 5 is an explanatory diagram of a procedure for incorporating the linear guide device 19 and the housing 20 into the carriage 15.

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

FIG. 7 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

15 Carrage 17 spindles 20 housing 19 Straight guide device 19a cylindrical roller 19b holding plate 73 Soft wiper 74 dust wiper 70 seal unit 85 Lower cover

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Claims (3)

[Claims] 1. A spindle for rotatably holding a tool is supported by a carriage through a linear guide device composed of a rotating body and a retainer for holding the rotating body, the carriage is positioned in the horizontal direction, and the spindle is provided. In the printed circuit board processing machine for processing by moving the tool in the axial direction of the tool, dust-proof means is arranged in the carriage to shut off the linear guide device from the outside. 2. The printed circuit board processing machine according to claim 1, further comprising a passage connecting an inside of the carriage that holds the linear guide device and an outside of the carriage. 3. The printed circuit board processing machine according to claim 2, wherein the passage is used as a reference hole for positioning the retainer.