JP3043056B2 - Board holding device in printed circuit board drilling machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board holding device in a printed board drilling machine, and more particularly, to a board holding device for improving work efficiency.

[Conventional technology]

In drilling a printed board, a plurality of printed boards, a lower plate and an upper plate are overlapped and processed. For this reason,
In order to eliminate the adverse effect on the processing due to the warpage of multiple stacked plates, the area near the processed part is pressed with a force of 10 kg when drilling.

For this reason, for example, a pressure foot as disclosed in JP-A-59-205209 has been proposed as a substrate holding device. The pressure foot is connected to a dust collecting device to discharge chips generated from the perforated portion, and is constantly evacuated during processing.

[Problem to be Solved by the Invention] When such a pressure foot is used, one hole is finished and the hole moves to the next hole position. Therefore, when the pressure foot is raised, the suction force of the dust collecting device causes The upper plate is sucked up.

For this reason, it is necessary to raise the pressure foot to a position where the upper plate surely separates from the pressure foot, which is a restriction in improving workability.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to reduce the amount of unnecessary movement of a drill by suppressing the lifting of an upper plate, thereby improving the efficiency of drilling work. In providing the device.

[Means for solving the problem]

In order to achieve the above object, according to the present invention, in a board holding device in a printed board drilling machine, a front end surface protrudes further to a table side than the contact surface outside a contact surface with a printed board, and its axial direction A plurality of movable brushes are provided at predetermined intervals, and biasing means for biasing the brushes toward the table with a force greater than the suction force generated by the dust collecting device is provided.

[Action]

Then, when the drill is lifted after the drilling, the drill is first detached from the upper plate, and then the holding portion of the substrate holding device is detached from the upper plate. At this time, since the upper plate is pressed by the brush, its lifting is suppressed.

Therefore, since the amount of rise of the pressure foot can be reduced and the drilling time can be shortened, the work efficiency of the drilling operation can be improved.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5.

In the figure, 1 is a spindle unit of a printed circuit board drilling machine. A spindle 2 is rotatably supported by the spindle unit 1 and has a chuck for holding a tool at one end. Reference numeral 3 denotes a tool which is detachably held by the chuck.

Numeral 4 denotes a cylinder, and a spindle unit 1 is formed at one end thereof so as to form a space 5 between itself and the spindle unit 1.
And is fixed to a saddle (not shown) of a printed circuit board drilling machine. Reference numeral 6 denotes a compressed air supply port, which is connected to the space 5.

Reference numeral 7 denotes a piston, one end of which is slidably fitted in the space 5.

Reference numeral 8 denotes a pressure foot, which is fixed to one end of the piston 7. Reference numeral 9 denotes an exhaust port formed on a side surface of the pressure foot 8 and connected to a dust collector (not shown). Ten
Is a pad in contact with the printed circuit board. A plurality of grooves 11 are formed in the contact surface with the printed circuit board.
It is fixed to.

A spring holder 12 is fixed to the pressure foot 8 at a predetermined interval. Reference numeral 13 denotes a spring having a spring force stronger than the suction force generated by the dust collector, and is inserted into the spring holder 12. Reference numeral 14 denotes a brush whose binding portion is slidably supported by the spring holder 12. A stopper 15 is fixed to the pressure foot 8 so as to prevent the brush 14 from falling off. The length of the brush 14 is set such that the bristle tip of the brush 14 protrudes from the pad 10 toward the printed circuit board when the binding portion of the brush 14 contacts the stopper 15.

17 is the upper plate. 18 is a printed circuit board. Reference numeral 19 denotes a lower plate, which is fixed together with the upper plate 17 and the printed board 18 in advance and fixed on a table (not shown) of a printed board drilling machine. Hereinafter, a work in which the upper plate 17, the printed board 18, and the lower plate 19 are integrally fixed is referred to as a work 20.

With such a configuration, as shown in FIG. 4, the work 20 is pressed by the brush 14 and the pad 10 to make a hole. And
When the tool 3 is fed to a predetermined depth and drilling is completed, the saddle is raised, and the spindle unit 1 and the cylinder 4 are raised. Then, the cylinder 4 becomes the piston 7
The pad 10 holds the work 20 under the pressure of the compressed air supplied to the space 5 until the lifting of the work is started.

The tool 3 comes out of the work 20 and the cylinder 4
Is lifted, the pad 10 can be separated from the work 20 as shown in FIG. At this time, since the upper plate 17 is pressed by the brush 14, the upper plate 17 is separated from the pad 10 without being sucked up by the pad 10.

Thus, by pressing the upper plate 17 with the brush 14,
The lifting of the pressure foot 8 can be reduced to move to the next drilling position, and the vertical movement distance of the saddle in drilling can be reduced, and the drilling time can be reduced, thereby improving work efficiency. Can be.

In the above embodiment, the example in which the upper plate is provided on the printed board is described, but the upper plate may not be provided.

〔The invention's effect〕

As described above, according to the present invention, since the brush for pressing the work is provided on the pressure foot, the working efficiency can be improved without deteriorating the quality of the processed hole.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a substrate holding device according to the present invention,
FIG. 2 is a bottom view of FIG. 1, FIG. 3 is an enlarged front sectional view of a brush mounting portion, and FIGS. 4 and 5 show a drilling process using the substrate holding device of the present invention. It is a process drawing. 1 ... Spindle unit, 4 ... Cylinder, 8 ... Pressure foot, 10 ... Pad, 13 ... Spring, 14 ... Brush.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23B 41/00 B23B 47/28 B26D 7/02

Claims (1)

(57) [Claims] 1. A suspension device supported by a cylinder so as to be slidably fitted to a spindle unit of a printed circuit board drilling machine,
And with the pressure foot connected to the dust collector,
In a board holding device of a printed board drilling machine configured to press a printed board against a table at the time of drilling, a tip of the pressure foot projects outside the contact surface with the printed board, and further projects toward the table side from the contact surface. A plurality of brushes movable in a predetermined direction are provided at predetermined intervals, and an urging means for urging the brush toward the table with a force larger than an attraction force generated by the dust collector is provided. Board holding device in printed circuit board drilling machine.