JPH0585283B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for automatically inspecting for breakage of a tool mounted on the head of a machine tool.

<Prior art> A device that automatically inspects tools such as drills attached to the head of a machine tool for breakage is a device that presses a contact from a direction perpendicular to the axis of the tool to be inspected. A mechanism is used in which a sensor detects the movement position of the sensor.

<Problems to be Solved by the Invention> The conventional tool breakage inspection device described above corresponds to a tool of a fixed length to be detected, and tools of different lengths are indexed at the same position, such as in a gearing head. In such cases, the above-mentioned conventional device could not cope with the situation.

SUMMARY OF THE INVENTION An object of the present invention is to ensure that even if tools of different lengths are indexed at the same position due to gearing head exchange, the presence or absence of breakage can be reliably inspected using the same inspection device.

<Means for Solving the Problems> The present invention has a plurality of breakage inspection sections attached to a movable plate that moves forward and backward in the axial direction of the tool by an actuator, and a length of each of the plurality of breakage inspection sections is determined for each gigantic head. As a breakage inspection unit corresponding to different tools, a holding shaft is supported by the movable plate so as to be relatively movable in the axial direction of the tool; The tool includes an inspection axis that can come into contact with the tip of the tool, and a sensor that detects whether the position of the inspection axis with respect to the holding axis is within an allowable range when the movable plate moves to the forward end on the tool side. , each gearing head is provided with a stopper that protrudes in the axial direction of the tool and can come into contact with the holding shaft, and when the movable plate is moved to the forward end on the tool side with the tool unbroken,
The length of the stopper in the tool axis direction is determined for each gearing head so that the holding shaft is positioned relative to the inspection shaft within the permissible range of the sensor.

<Function> According to the present invention, when the movable plate is advanced toward the tool by the actuator, the holding shaft contacts the stopper and moves backward relative to the movable plate in the axial direction of the tool.
The inspection shaft contacts the tip of the tool and moves backward in the axial direction of the tool with respect to the holding shaft. At this time, if the tool is not broken, the position of the inspection axis relative to the holding axis will be within the allowable range. If the tool is broken, the position of the inspection axis relative to the holding axis will be outside the allowable range, and
A sensor detects this and notifies you of an abnormality.

<Example> An example of the present invention will be described below based on FIGS. 1 and 2.

1 is a gearing head, and 2 is a tool attached to the gearing head 1. In place of the gearing head 1 shown in FIG. 1, another gearing head (not shown) is indexed.
A tool 2 indexed at the same position as the tool 2 of the gearing head 1 and having a different length than the tool 2 of the gearing head 1 is attached to the other gearing head.

The present invention inspects for breakage of such tools 2 having different lengths indexed at the same position, 9 indicates the breakage inspection part, and 24 always inspects the tools 2 having a constant length. This figure shows the breakage inspection section of a conventional mechanism for inspecting. Both the breakage inspection section 9 according to the present invention and the breakage inspection section 24 of the conventional mechanism are attached to the movable plate 4.

This movable plate 4 is connected to a fixed plate 5 as shown in FIG.
The tool 2 is fixed to a guide shaft 6 that is slidably guided by the tool 2, and is movable forward and backward relative to the tool 2 by a piston rod 8 of a cylinder device 7 fixed to the fixed plate 5.

Therefore, the present invention provides a tool 2 near the tool 2.
A stopper 3 is provided on the gearing head 1 so as to protrude with a length corresponding to the length of the unbroken tool along an axis parallel to the tool. Further, the breakage inspection section 9 according to the present invention supports a holding shaft 10 on the movable plate 4 via a guide bush 11 so as to be slidable in the axial direction on the same axis as the tool 2. This holding shaft 10 is always pushed in the forward direction by a spring 12, and a bracket 21 attached to the rearward side of the holding shaft 10 comes into contact with the end of the guide bush 11, so that the forward end position is regulated. Further, a bracket 13 is fixed to the tip of the holding shaft 10, and a bolt 14 is attached to this for abutting against the stopper 3 and positioning the holding shaft 10 at a fixed position corresponding to the length of the tool 2.

An inspection shaft 15 passes through the axis of the holding shaft 10 so as to be relatively movable, and has a contact surface 16 at its tip that comes into contact with the tip of the tool 2, and is always pushed in the forward direction by a spring 17. has been done. Inspection axis 15
The rear end projects outward from the rear end surface of the holding shaft 10, and a flange 18 for regulating the forward end of the inspection shaft 15 is provided on this projecting portion.

Further, a sensor is provided at the rear end of the inspection shaft 15 and the rear end of the holding shaft 10 to detect whether the position of the inspection shaft 15 with respect to the holding shaft 10 is within an allowable range. This sensor electrically detects and notifies the presence or absence of breakage of the tool 2, and includes a first plate 19 attached to the rear end of the inspection shaft 15,
The second plate 20 attached to the bracket 21 at the rear end of the holding shaft 10 constitutes an electrical switching contact. The first plate 1 shown in FIG.
The range from the non-contact state between the first plate 19 and the second plate 20 to just before the first plate 19 comes into contact with the second plate 20 is the permissible range of the sensor. Within this tolerance range, the first plate 19 relative to the second plate 20
Whether or not the tool 2 is broken is determined based on whether the tool 2 is located or not. 22 is a power source, and a circuit is constructed so that when the first plate 19 and the second plate 20 come into contact, a normally open relay contact R is turned on, and an alarm such as an abnormality indicator lamp L is energized. . Incidentally, on this energizing circuit, a switch 23 is provided between the power supply and the normally open relay contact R, which is turned ON only when the movable plate 4 is positioned at the forward end by the cylinder device 7.

Next, the concrete operation of the above-mentioned present invention will be explained. When the movable plate 4 is in the retracted position, the holding shaft 10 is moved forward by the pressing force of the spring 12, and the bracket 21 abuts against the end of the guide bush 11 to restrict the forward end. In addition, inspection axis 1
5 is also pressed in the forward direction by a spring 17 on the holding shaft 10, and the flange 18 abuts against the rear end of the holding shaft 10 to restrict the forward end. In this state, the first plate 19 and the second plate 20 are in contact with each other, but the switch 23 is turned OFF.
As a result, the power to the normally open relay contact R is cut off, and the abnormality indicator lamp L is turned off.

When the movable plate 4 moves to the forward end to inspect whether or not the tool 2 is broken, the tool 2 enters the tip of the holding shaft 10 and first the bolt 14 at the tip of the holding shaft 10 is moved.
comes into contact with the stopper 3. With this, the movable plate 4
As the tool 2 moves forward, the holding shaft 10 moves relatively in the backward direction, and at the forward end position of the movable plate 4, the holding shaft 10 moves toward the tool 2.
It is positioned at a fixed position according to the length of. At the same time, the tip of the tool 2 comes into contact with the contact surface 16 at the tip of the inspection shaft 15, moves relative to the holding shaft 10, and stops. At this relative movement stop position of the inspection shaft 15, if the distance A between the contact surface 16 and the end surface of the stopper 3 is a constant distance corresponding to the predetermined length of the tool 2, the first plate 19 and the There is no contact with the second plate 20, and the abnormality indicator lamp L is not lit.
Tool 2 is normal. However, if the tool 2 is broken and shortened, the inspection shaft 15 moves forward and does not reach the constant distance A. As a result, the first
The plate 19 comes into contact with the second plate 20 to close the energizing circuit to the abnormality indicator lamp L and notify the presence of breakage. The stopper 3 has long and short dimensions corresponding to the length of the unbroken tool 2. That is, when the length of the tool 2 is large, the stopper 3 is provided with a correspondingly long size, and when the length of the tool 2 is small, a stopper 3 with a short size is provided.

<Effects of the Invention> As described above, in the present invention, the movable plate that is moved by the actuator is provided with a plurality of breakage inspection parts, so that breakage of a plurality of tools can be detected simultaneously by simply moving the movable plate. effective. In addition, a stopper protruding from the gearing head positions the holding shaft at a position corresponding to the length of the unbroken tool, and the inspection axis is positioned at a position corresponding to the actual length of the tool. By detecting the relative movement of the inspection axis and the inspection axis with a sensor, even if there are multiple tools attached to the gearing head that have different lengths for each gearing head, the tool can be inspected in the same way as a tool with a constant length. In addition, since the movable plate only needs to be moved forward and backward a certain amount, the movable plate can be moved to a position according to the length of the tool.
There is no need for NC feeding, and it is possible to provide a tool breakage inspection device that is inexpensive and has a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the device of the present invention, and FIG. 2 is a sectional view of the main parts of the device of the present invention. DESCRIPTION OF SYMBOLS 1... Gearing head, 2... Tool, 3... Stopper, 4... Movable plate, 9... Breakage inspection section, 10
... Holding shaft, 14 ... Bolt, 15 ... Inspection shaft,
16... Contact surface, 19... First plate, 20...
...Second plate, 22...Power supply, L...Error indicator lamp.

Claims (1)

[Claims] 1. A tool breakage inspection device equipped with a plurality of gearing heads and a plurality of breakage inspection sections for inspecting a plurality of tools attached to each gearing head for breakage, the tool being moved forward and backward in the axial direction of the tool by an actuator. The plurality of breakage inspection sections are attached to a movable plate, and each of the plurality of breakage inspection sections is configured to be movable relative to the movable plate in the axial direction of the tool as a breakage inspection section corresponding to a tool having a different length for each gearing head. A supported holding shaft, an inspection shaft that is held through the holding shaft so as to be relatively movable in the axial direction of the tool and that can come into contact with the tip of the tool, and the movable plate moved to a forward end on the tool side. A sensor is provided to detect whether the position of the inspection axis with respect to the holding shaft is within a permissible range, and a stopper that can come into contact with the holding shaft is provided on each gearing head in a protruding direction in the axial direction of the tool. When the movable plate is moved to the forward end on the tool side in an unbroken state,
A tool breakage inspection device characterized in that the length of the stopper in the tool axis direction is determined for each gearing head so that the holding shaft is positioned with respect to the inspection axis within an allowable range of the sensor.