JPS6210799B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a drilling machine that allows easy collection of drilling debris.

Punches that form holes for binding in paper such as books usually use a hollow tube-shaped awl as the aperture, and the perforation waste is passed through the inside of the aperture to a place away from the perforated part. configured to eject.

The structure of this type of drilling machine is that the rotary shaft of the electric motor is formed into a tube shape that communicates with the hole, and the drilling waste is transferred through each tube to the side opposite to the side where the hole is attached to the motor and placed in a predetermined container. In this method, the electric motor is also installed vertically because the awl is installed vertically, so in order to collect the drilling waste at the top, the collection container and rotating shaft must be connected to a thin piece of paper or other material. It was necessary to attach the collection container closely to prevent it from spilling out, and when removing the collection container, special care had to be taken to prevent drilling debris from falling out from the through hole in the part where it fits with the rotating shaft.

Furthermore, it is preferable to form ventilation holes on the top surface for cooling the electric motor, but since the collection container is attached to the top, the perforation waste that has become powdered due to long-term use can be ventilated through the gap between the collection container and the rotating shaft. There is a problem that it can enter the inside of the motor through the holes and accumulate, and if the ventilation holes of the motor are formed on the side to direct the exhaust air to the side, the internal cooling structure becomes complicated. There have been problems in that a sufficient cooling effect cannot be obtained, or the windings and rotor can be seen directly from the outside, making it easy for foreign objects to get in.

In view of these circumstances, it is an object of the present invention to provide a drilling machine having a structure that improves the cooling effect of the electric motor, prevents drilling debris from entering the inside, and allows easy collection of drilling debris. .

The present invention will be explained below based on an embodiment shown in the drawings.

The figure is a vertical sectional view of the main part of the drilling machine according to the present invention, and a column 1 has a vertical electric motor 2 as a power source that can be moved up and down.
is attached, and this electric motor 2 is connected to the shaft 4 of the rotor 3.
is formed in the shape of a hollow tube, and a drill bit 5 for drilling, which is formed in the shape of a hollow tube, is attached to the lower end of the shaft 4.

The upper end of the shaft 4 extends to the upper surface of an upper bracket 6 of the electric motor 2, and this bracket 6 is formed with its upper surface inclined to one side, and is provided with a large number of small ventilation holes 7.

A fan 8 is formed in the lower part of the rotor 3, and the fan 8 sucks air from the through hole 10 of the lower bracket 9 through the cooling passage 12 formed in the stator 11 to the through hole of the upper bracket 6. 7
It is configured to exhaust air upwards.

A removable cover 13 that covers the entire upper surface of the bracket 6 is provided with perforated debris 1 in the direction of inclination of the bracket 6.
A box-shaped collection part 17 for depositing and collecting 6 is integrally formed, and a large number of small through holes 14 are formed in the upper part of the outer surface near the collection part 17 to allow drainage to the outside of the cover 13. It forms a wind path.

Further, an arrow 15 in the figure indicates the direction in which the drilling waste 16 is transferred, and the structure is such that all the drilling waste 16 is transferred to the recovery section 17 side of the cover 13.

In such a configuration, when a workpiece such as a book is drilled with the drill 5 rotated by the electric motor 2, the drilling debris 16 generated at this time is stacked in the hollow part of the drill 5 and the shaft 4 from bottom to top. The drilling debris 16 discharged from the upper end of the shaft 4 is transferred to the collecting section 17 along the slope of the upper surface of the bracket 6.

At this time, the numerous through holes 7 of the bracket 6
Cooling air from the electric motor 2 is blown up from the hole, and this cooling air is discharged through the through hole 14 above the collection section 17, so that the drilling debris 16 slides down on the inclined surface of the bracket 6 as if floating. Since the particles are transferred in this manner, they can be reliably recovered to the recovery section 17 without being accumulated on the upper surface of the bracket.

When the collecting portion 17 is full of drilling debris 16, the cover 13 may be removed, the drilling debris 16 may be disposed of, and then the cover 13 may be reattached to the upper surface of the bracket 6.

On the other hand, for cooling the electric motor 2, a through hole 10 of the lower bracket 9 is connected to a through hole 7 of the upper bracket 6.
Since the air can be ventilated to the motor 2, it can be effectively cooled, and since the ventilation hole 7 for exhausting air is provided inside the cover 13, the motor 2 can be cooled effectively.
It is possible to prevent the interior from being viewed directly and spoiling the aesthetic appearance, and to prevent foreign substances such as metal from entering through the through hole 7.

In addition, by forming the cover 13 with a transparent material, it is easy to check the accumulation of drilling debris 16, and it is also easy to discover accidental conditions such as the shaft 4 or the drill bit 5 being clogged with drilling debris 16 that cannot be removed. can.

Furthermore, since the mounting structure of the cover 13 is not loosely fitted to the outer periphery of the shaft 4 through a small gap as in the conventional case, problems such as heat generation due to friction with drilling debris that have entered this gap do not occur. .

As explained above, according to the present invention, the drilling debris can be collected by moving the drilling debris along the slope of the upper surface of the bracket and also by effectively utilizing the cooling air from the electric motor.

[Brief explanation of the drawing]

The figure is a longitudinal cross-sectional view of a main part of a drilling machine showing an embodiment of the present invention. 2...Electric motor, 4...shaft, 5...hole, 6...
Bracket, 7...Through hole, 13...Cover, 16
...Drilling waste.

Claims (1)

[Claims] 1. In a drilling machine in which the shaft of a vertical electric motor is formed into a tubular shape, a tubular drill is attached to the lower end, and the upper end extends to the upper surface of the bracket, the upper surface of the bracket is inclined to one side, and the upper surface of the bracket is It is covered with a removable cover that has a collecting section for drilling debris formed in an inclined direction, and through holes are provided in the upper surface of the bracket and in the vicinity of the collecting section of the cover, so that the cooling air inside the motor can be channeled through each of the through holes. A drilling machine characterized by being configured to allow air to pass through the hole and be exhausted to the outside.