JP2929040B2 - Pressure foot of printed circuit board processing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure foot for a printed circuit board processing machine, and more particularly to a pressure foot suitable for counterboring a printed circuit board.

[0002]

2. Description of the Related Art As a pressure foot of a printed circuit board processing machine, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 61-5509. In the counterboring of a printed circuit board, a brush with the brush removed from the pressure foot is used.

At the time of counterboring, the printed circuit board is pressed with rubber, and processing is performed while sucking and removing chips generated in the processing section through a duct. At this time, the spindle moves in the X and Y directions according to the designated processing locus, but the pressing member is restricted from moving because the rubber is in contact with the printed circuit board, and slides between the main body and the pressing member. Has occurred.

[0004]

Some printed circuit boards that require counterboring are as thin as 0.2 mm. Since the rigidity of such a thin printed board is low, as shown in FIG. 5, when the spindle 1 and the pressure foot 2 are raised, the printed board 3 also floats from the table 4 by the suction force of the dust collector. If the spindle 1 is moved to the next processing position in this state, the printed circuit board 3 will be damaged. In order to prevent such damage to the printed circuit board, a shutter is provided in the dust collector, and when the spindle 1 is moved, the suction force is cut off and the printed circuit board 3 is separated from the pressure foot 2.

For this reason, every time the spindle 1 is moved to the next processing position, a wasteful waiting time is generated, which causes a decrease in productivity.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure foot for a printed circuit board processing machine capable of improving the productivity of counterboring in view of the above circumstances.

[0007]

In order to achieve the above object, according to the present invention, there is provided an L-shaped footpiece fitted to one end of a spindle of a printed circuit board processing machine so as to be movable in the axial direction thereof. A pair of brackets formed and fixed to the side surface of the footpiece such that one end thereof faces the lower end surface of the footpiece at a predetermined interval, and a pair of spring supports fixed to the bracket and extending in the horizontal direction. And the said
Between the lower end surface of the footpiece and the upper surface of the bracket,
Gap between the lower end surface of the footpiece and the upper surface of the bracket
In the axial direction of the spindle and the direction perpendicular to the axial direction.
Movably arranged on the upper surface facing the footpiece
The steel ball is supported rotatably, and the bottom facing the printed circuit board
An annular slide plate provided with a work retainer having elasticity on the surface, and coupling the spring receiver and the slide plate ;
Elastic slide plate with its spindle inside its opening
A plurality of springs are provided to support the center .

[0008]

[Function] And in processing, steel ball with footpiece
To push the workpiece through the slide plate.
The printed circuit board against the printed circuit board.
The transfer is performed by relatively moving the board in the horizontal direction. this
Movement is performed by sliding the footpiece and
With relative movement of the plate, but the steel ball slides
The footpiece is rotatably supported on the upper surface of the
The relative movement of the slide plate and the slide plate can be performed smoothly,
Becomes easier. Also, it is necessary to discharge chips generated during processing.
Or use a steel ball to
Since a gap is formed between the
The suction of the dust machine is weakened, but the gap is small.
It does not affect the discharge of the eye chips.

When the counterboring process is completed and the spindle starts to rise, the footpiece is first lifted. Then
The footpiece separates from the slide plate and the gap between them expands, the amount of air flowing into the space surrounded by the spindle, the footpiece, the slide plate, the work holder and the printed circuit board increases, and the pressure in the space becomes atmospheric pressure. You will get closer. As a result, collections acting on the printed circuit board
The suction power of the dust machine is almost eliminated. In this state, the bracket engages with the slide plate to raise the slide plate and the work holder. Therefore, the printed circuit board does not float.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the figure, 11 is a table,
It is arranged so as to be movable in the X (front and rear in the drawing) direction. 1
Reference numeral 2 denotes a printed circuit board which is mounted and fixed on the table 11.

Reference numeral 13 denotes a spindle unit which is arranged so as to be movable in the Y (left and right directions in the drawing) direction and the Z (vertical direction in the drawing) direction. A spindle 14 is rotatably supported by the spindle unit 13. A collet chuck 15 is supported by the spindle 14 so as to be openable and closable. A tool 16 is detachably held by the collet chuck 15.

Reference numeral 17 denotes a rod, and the spindle unit 13
Protrudes from an air cylinder (not shown) integrally connected with the air cylinder. Reference numeral 18 denotes a footpiece, which is slidably fitted to one end of the spindle unit 13 and supported by the rod 17. Reference numeral 19 denotes a dust collecting duct, which is attached to the footpiece 18 and the other end is connected to a dust collector (not shown). Reference numeral 20 denotes an L-shaped bracket, which is fixed to the footpiece 18 such that one side thereof faces the lower end surface of the footpiece 18. Reference numeral 21 denotes a spring receiver, which is fixed to the bracket 20.

Reference numeral 22 denotes a slide plate, which is disposed in a gap between the lower end surface of the footpiece 18 and the bracket 20. Reference numeral 23 denotes a retainer which is supported on an end surface of the slide plate 22. Reference numeral 24 denotes a steel ball rotatably supported by a retainer 23, and an upper portion thereof protrudes from an end surface of the slide plate 22. 25 is a pin fixed to the slide plate 22. Reference numeral 26 denotes a spring, which is stretched between the spring receiver 21 and the pin 25.

A work holder 27 is formed of a resin compound such as rubber, and is fixed to the slide plate 22.
Reference numeral 28 denotes a groove formed on the end face of the work holder 27.

With such a configuration, the spindle unit 13 is lowered while operating the dust collector and sucking the inside of the footpiece 18 through the duct 19. Then, the work presser 27 contacts the printed circuit board 12 and stops at that position. When the spindle unit 13 further descends,
The foot piece 18 comes into contact with the steel ball 24. When the spindle unit 13 further descends, it is pushed into the rod 17 and the air cylinder, and presses the work holder 27 against the printed circuit board 12 with a force corresponding to the pressure supplied to the air cylinder. When the spindle unit 13 further descends, the tool 13 cuts into the printed circuit board 12, as shown in FIG.

In this state, the spindle unit 13 is
-Move in the Y direction to perform the required counterboring process. At this time, since the work presser 27 is pressed against the printed circuit board 12 and its movement is restricted, the footpiece 18 and the slide plate 22 (steel ball 24) move relatively. In this movement, the footpiece 18 and the slide
Plate 22 is in contact with the steel ball 24 via a steel ball.
24 is rotatably supported on the upper surface of the slide plate 22.
So that the relative position of the footpiece and the slide plate
The movement can be performed smoothly by rotating the steel ball 24. Chips generated by the processing are sucked into the dust collector through the duct 19 by the airflow flowing from the groove 28 formed in the work holder 27 and the airflow flowing from the gap between the footpiece 18 and the slide plate 22.

When the machining is completed, the spindle unit 13 starts to rise. Then, when the tool 16 comes off the printed circuit board 12, the rod 17 starts to move up together with the spindle unit 13. At this time, since there is a gap between the foot piece 18 and the slide plate 22, the slide plate 22 and the work holder 27
Left on. When the footpiece 18 moves up by the distance L1, the bracket 20 engages with the slide plate 22, as shown in FIG. At this time, since a gap of the distance L1 is formed between the footpiece 18 and the slide plate 22, the pressure in the footpiece 18 becomes close to the atmospheric pressure, and the suction force on the printed circuit board 12 is almost eliminated.

When the spindle unit 13 further moves up, the slide plate 22 is pulled up by the bracket 20, and the work holder 27 is separated from the printed circuit board 12.

As described above, the foot piece 1 during processing is used.
8 and slide plate 22 are rotatably supported
Is performed through the steel ball 24
The relative movement of the slide 18 and the slide plate 22 is smooth.
In addition, the processing work becomes easy. Also, after processing is completed,
When the foot 14 begins to ascend, first the footpiece 18 is pulled.
Is lifted and the footpiece 18 is
Away from each other, widening the gap between them, spindle 14, foot
Piece 18, slide plate 22, work holder 27 and
Air flowing into the space surrounded by the printed circuit board 12
The volume increases and the pressure in the space approaches the atmospheric pressure and prints
The suction force of the dust collector acting on the substrate 12 almost disappears,
As a result , the work holder 27 can be separated from the printed circuit board 12 without interrupting the suction force of the dust collector, so that there is no need to provide an extra waiting time when moving the spindle unit 13 to the next processing position. , Productivity can be improved.

FIGS. 3 and 4 show another embodiment of the present invention, in which the same components as those of FIG. 1 are denoted by the same reference numerals. A stopper 30 is fixed to the slide plate 22. A positioning pin 31 is fixed to the slide plate 22. Reference numeral 32 denotes a plate having a groove formed at one end to be fitted to the positioning pin 31. The work holder 27 is fixed to the plate 32. 33 is a screw for fixing the plate 32 to the slide plate 22.

With such a configuration, a plurality of work holders 27 having different sizes are prepared, and the work holders 27 are exchanged according to the size of the counterbore processing. Floating can be prevented, and processing accuracy in the depth direction can be improved.

[0022]

As described above, according to the present invention, an L-shaped foot piece is fitted to one end of a spindle of a printed circuit board processing machine so as to be movable in the axial direction.
One end so as to face in the lower end surface at a predetermined distance of the foot piece, a pair of brackets fixed to the side surface of the foot piece, is fixed to the bracket, and a pair of spring bearing which extends in the horizontal direction, the The lower edge of the footpiece and the bra
Between the lower surface of the footpiece and the bracket
In the gap between the racket and the upper surface, the axial direction of the spindle and
It is arranged movably in a direction perpendicular to the axial direction, and
The steel ball is rotatably supported on the upper surface facing the
Work holder with elasticity on the lower surface facing the lint substrate
An annular slide plate provided with a spring, the spring support and the slide plate are coupled , and the slide plate is elastically
Since a plurality of springs are provided to support the spindle so that the axis of the spindle is located in the opening, productivity of counterboring can be improved.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a state during processing of a pressure foot according to the present invention.

FIG. 2 is a front sectional view showing a pressure foot ascending process.

FIG. 3 is a bottom view of a pressure foot showing another embodiment of the present invention.

FIG. 4 is a side sectional view showing a main part of FIG. 3;

FIG. 5 is an explanatory diagram showing a problem in the related art.

[Explanation of symbols]

13 Spindle unit 18 Footpiece 20 Bracket 21 Spring receiver 22 Slide plate 24 Steel ball 26 Spring 27 Work holder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23B 41/00 B23B 47/00 B23B 47/28

Claims (1)

(57) [Claims] 1. A footpiece fitted to one end of a spindle of a printed circuit board processing machine so as to be movable in its axial direction.
A pair of brackets fixed to the side surface of the footpiece and fixed to this bracket so that the L-shape is formed and one end faces the lower end surface of the footpiece at a predetermined interval,
A pair of horizontally extending spring supports,
Between the lower end of the base and the upper surface of the bracket.
Spin within the gap between the lower end face of the piece and the upper face of the bracket.
Moveable in the axial direction of the handle and the direction perpendicular to the axial direction
A steel ball is turned on the upper surface that is placed and faces the footpiece.
Rollable support, elastic on the lower surface facing the printed circuit board
An annular slide plate provided with a work retainer having a spring holder and a slide plate ,
Place the slide plate in its opening with the spindle axis centered.
A pressure foot for a printed circuit board processing machine, comprising: a plurality of springs that are supported so as to be placed .