JPS5943262B2 - Drill breakage detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a drill breakage detection device used in a printed circuit board drilling machine, which is difficult to directly observe.

Conventionally, in printed circuit board drilling machines, the drill rotates at high speed (3
0,000-90,000 rpm) and is repeatedly moved up and down, the drill base is small (0,3-90,000 rpm) and is repeatedly moved up and down.
6.0φ), it is extremely difficult to detect a broken drill due to environmental conditions such as a large amount of chips (dust) being generated and a narrow space. Ta.

The present invention has been made to solve the above-mentioned drawbacks, and includes a drill that is attached to the tip of a spindle that is movable in horizontal and vertical directions, and that performs hole-drilling work in response to a hole-drilling command from a control device. It consists of a duct installed nearby that sucks in chips and a chip detector that detects chips passing through the duct, and detects the synchronization state of the drilling signal of the control device and the detection signal of the chip detector. This feature is characterized in that breakage of the drill is detected by observation.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is the fuselage, 2 is a table provided on the fuselage 1 via a screw 3 so as to be movable in the front and back direction;
4 is a printed circuit board placed on the table 2, 5 is a motor fixed to the body 1, 6 is a slider provided so as to be movable in the left and right direction via a screw 7 directly connected to the axis of the motor 5, and 8 is a motor fixed to the body 1; A motor 9 fixed to the slider 6 is a saddle provided vertically movably via a screw 10 directly connected to the shaft of the motor 8.

11 is a bracket fixed to the saddle 9, 12 is a spindle rotatably attached to the bracket 11, 13 is a drill attached to the tip of the spindle 12, 14 is a cylinder fixed to the lower end of the bracket 11, and 15 is a cylinder A movable body is housed inside the spindle 14 so as to be slidable vertically along the outer peripheral surface of the spindle 12 and the inner peripheral surface of the cylinder 14. The movable body 15 surrounds the drill 13 and is located opposite to the drill 13 A drill 130 through hole 15a is provided on the surface, and a chip suction port 15b is provided on the outer peripheral surface near the drill 13.

16 is a hose attached to the cylinder 14.

17 is a flexible duct whose one end is connected to the suction port 15b of the moving body 15 and the other end is connected to a pipe 18, for example, a glass tube with a low dielectric constant, and 19 is attached to the slider 6 to support the pipe 18. A support 20 is a flexible duct connected to the pipe 18 at one end and a dust collector 21 at the other end, and a chip detection device 22 is attached to the slider 6 to face the pipe 18 with an appropriate gap. For example, a photo sensor.

Instead of this photosensor, a coil wire is wound around the outer peripheral surface of the pipe 18 to form a magnetic field, and the pipe 18 is electromagnetically induced.
8 may be detected.

Next, its effect will be explained.

When drilling a hole in the printed circuit board 4 using the drill 13, first pressurized fluid is injected into the cylinder 14 through the hose 16, and the moving body 15 is lowered to press the printed circuit board 4 against the table 2.

Next, the drill 13 is rotated at high speed via the spindle 12, and at the same time, the saddle 9 is lowered to lower the drill 13 via the bracket 11 and the spindle 12, and the tip of the drill 13 is passed through the through hole 15a of the movable body 150. Drill a hole in the printed circuit board 4.

The above-mentioned drilling operation is performed based on a drilling signal 23 having a drilling instruction section 23a transmitted from a control device (not shown) (see FIG. 2).

Chips of the printed circuit board 4 cut by the drilling operation are led out to the bottom of the movable body 15 through the through hole 15a.

The drawn-out chips are sucked into the duct 17 from the suction port 15b of the movable body 15 by the suction force of the dust collector 21, pass therethrough, and further pass through the pipe 18 and the duct 20 to be collected in the dust collector 21. be done.

In this case, when chips pass through the pipe 18, the chip detector 22 detects a chip indicator 24a as shown in FIG.
A chip detection signal 24 having the following value is transmitted.

When the chip indicating portion 24a and the hole drilling instruction portion 23a correspond to the detection interval 25a of the detection interval signal 25 as shown in FIG. 2, the drill 13 is drilling in a normal state without any abnormality. be able to recognize the

However, if there is no chip indication part in the chip detection signal 240 portion corresponding to the drilling indication part 23'a of the drilling signal 23 for the detection interval 25'a of the detection interval signal 25, it is determined that no chips are generated. Easy to understand.

In other words, since the drill 13 is broken and in an abnormal state, if the chip indicating section 24a of the chip detection signal 24 is not detected, a warning light or buzzer is used to notify the operator. .

As explained above, according to the present invention, drill breakage can be detected easily and reliably by observing the synchronization between the hole drilling signal of the control device and the detection signal of the chip detector. person can be informed.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway configuration diagram showing an embodiment of the present invention;
FIG. 2 is an explanatory diagram of a state in which the presence or absence of drill breakage is detected in the embodiment shown in FIG. 1. 12...Spindle, 13...Trill, 17゜18...Duct, 22...Chip detector, 23...Drilling hole Signal, 24...
-Chip detection signal, 25...Detection section signal.

Claims (1)

[Claims] 1. A drill that is attached to the tip of a spindle that is movable in the horizontal and vertical directions and that performs drilling operations in response to a drilling command from a control device, a duct that is installed near this drill to suck up chips, and this duct. The drill is comprised of a chip detector that detects when chips pass through the drill, and breakage of the drill is detected by observing the synchronization state of the drilling signal of the control device and the detection signal of the chip detector. A drill breakage detection device characterized by: