JP2561048Y2 - Perforation detection device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting the presence or absence of a hole in a work machined by a machine tool, and more particularly to a device for detecting the presence or absence of a hole which can monitor the operation state of a detection sensor.

[0002]

2. Description of the Related Art Drilling various small holes and screw holes in a workpiece by a machine tool is generally performed in parts manufacturing processes in many industries. However, in an unmanned machining process, it is very important that the screw holes and the like are securely drilled.For example, when there is no drilling at a predetermined position, it is not enough to simply stop the machining process, and it is not sufficient Quality of products, or defective products of assembly equipment (automobiles, home appliances, copiers, etc.). Then
In order to prevent such defective products from being manufactured, a device for inspecting whether or not a hole is reliably formed at a predetermined position on a workpiece has been devised and provided. However, with this conventional inspection device, it is insufficient to check whether the inspection device itself is operating reliably or not, and if the hole detection sensor or the like is not operating reliably, the subsequent inspection is performed. This has been a cause of failures during processing and assembly of parts. Therefore, as a device for monitoring the operation of the sensor in this inspection device, a device described in Japanese Utility Model Laid-Open No. 63-76443 has been proposed. The hole detecting sensor is always turned on at the retreating end (when separated from the inspection object) of the inspection tool main body, and the hole detecting sensor is turned off when the forward movement starts.

[0003]

[Problem to be solved by the present invention]
In the case of the device described in Japanese Patent No. 443, two operating rods having a spring interposed are provided for the hole detection sensor fixed to the main body, and each requires a detection terminal. A plurality of fitting holes for loosely fitting the respective operating rods must be formed, and the structure of the inspection device is complicated. Also, for checking the hole detection sensor, the body is temporarily retracted against the bias of the spring of the check operating rod,
The hole detection sensor is checked. In this case, a hole detection sensor check step is required separately from the hole presence / absence detection step. An object of the present invention is to provide a perforation detecting device which has a simple structure and operates reliably.
A perforation detection device that checks the operation of the hole detection sensor reliably by the guide of a single cam plate without providing new terminals etc. in the conventional device and during the detection process of the presence or absence of holes. To provide. The present invention also provides a drilling presence / absence detection device that can not only detect the presence / absence of a drilled hole but also reliably confirm the operating state of whether or not the hole detection sensor is operating. It is.

[0004]

In order to solve the above-mentioned problems, in order to solve the above-mentioned problem, an inner cylinder having a fixed plate fixedly mounted at one end to an inner cylinder slidably fitted in an outer cylinder fixed to the frame, A first sensor for detecting a movement start position of the inner cylinder when the inner cylinder moves, and a second sensor for detecting a stop position of the inner cylinder after the movement, the second sensor being provided on the frame body. A sensor, a shaft rod which is loosely fitted in a through hole in the inner cylinder, has a probe provided at a tip thereof, and is provided with a spring for urging the probe in the forward direction of movement of the inner cylinder ; A hole detection sensor movably provided near the rear end of the rod together with the shaft rod, a communication plate located opposite to the hole detection sensor and fixed to the fixing plate, and the inner cylinder the hole detecting terminal which is fixed to the contact plate on the sliding rod to slide reciprocally in the direction perpendicular to the forward movement direction with the forward movement of the frame Fixed, the fitting guide pins planted on the sliding rod engaged with respect to the forward movement direction of the inner cylinder to the sliding rod
A cam plate provided with a cam groove for reciprocating at right angles ,
A punching presence / absence detection device is provided on the frame plate, which is loosely fitted into a through hole of a fixed plate fixed to the inner cylinder, and includes a cam plate and a fixed guide parallel to the inner cylinder.

[0005]

Since the drilling presence / absence detecting device of the present invention has such a configuration, the measuring element arranged at the tip of the shaft rod is measured at the location of the machined hole of the workpiece by a hydraulic device (not shown) or the like. Advance with the inner cylinder to insert the tip of the child. When a hole is formed in the workpiece, the forward movement of the probe and the inner cylinder also moves the operation terminal of the movement start confirmation switch provided on the inner cylinder to detect the start of movement, and at the same time, the rear end The hole detection sensor of the sliding rod and the hole detection sensor connected to the shaft rod are separated from each other by the movement of the sliding rod with the hole detection terminal along the cam groove. It is out of the detection range of the sensor, and the hole detection sensor is turned off. Next, when the inner cylinder is further advanced, the movement of the sliding rod along the cam groove returns the hole detection terminal to the original position, and the hole detection terminal and the hole detection sensor are within the detection range of the hole detection sensor. Then, the hole detection sensor is turned ON. The normal operation of the hole detection sensor can be confirmed during the forward movement process of the tracing stylus and the inner cylinder. Furthermore, since the tip of the tracing stylus enters the hole and the shaft rod moves together with the advance of the inner cylinder, the hole detection terminal and the hole detection sensor provided for each are maintained in contact with each other, and the sliding rod is also connected to the shaft rod. Advance with. When the operating rod provided on the inner cylinder comes into contact with the second sensor of the stop position detecting section, the previous hole detection sensor is also turned on, so that the presence of a hole is detected.

On the other hand, whether a hole is formed in the workpiece or not.
The operation when the hole is not drilled at a predetermined depth will be described. The operation of confirming the operation of the hole detection sensor from the start of the advance of the inner cylinder is the same as described above. Since the stop is performed on the surface of the object or the like, even if the inner cylinder further advances, the shaft bar stops without advancing against the built-in spur along with the stop of the movement of the tracing stylus. Therefore,
When the second sensor of the stop position detecting section and the operating rod come into contact with each other, the hole detection terminal provided on the sliding rod of the inner cylinder advances, and the hole detection sensor is stopped. The hole detection terminal is out of the detection range of the hole detection sensor, and the hole detection sensor
It becomes FF and detects that there is no machining hole.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The perforation detection device of the present invention will be described with reference to the embodiment shown in the drawings. FIG. 1 is a plan view of the perforation detection device, FIG.
FIG. 3 is a plan view of the device for detecting the presence or absence of perforation as viewed in the direction of an arrow A in FIG. 1, and FIG. When fluid is introduced from the first supply port 20a of the detection main body 20 by a hydraulic device (not shown) or the like, the inner cylinder 1 that moves to the left in FIG. A shaft rod 2 is inserted into the inner peripheral portion of the inner cylinder 1 so as to be movable in the axial direction, and a tracing stylus 3 is screwed to a front end of the shaft rod 2. This shaft 2
A spring 4 is interposed (biased in the left direction in FIG. 2) between the stepped portion and the inner side surface of the inner cylinder 1. A connection plate 14a to which the hole detection sensor 6 is fixed is screwed to a mounting plate 14 at the rear end of the shaft 2 with screws. Fixing plate 1 at the rear end of inner cylinder 1
2 is fixed, and an operating rod 19 for operating position detecting microswitches 17 and 18 as a first sensor and a second sensor for detecting the forward / backward operation position of the inner cylinder 1 is disposed on the fixed plate 12. A sliding rod 21 is loosely fitted slidably on a communication plate 13 connected to the fixed plate 12 of the inner cylinder 1,
The guide pin 11 is implanted on the sliding rod 21. The guide pin 11 is loosely fitted in the cam groove 9 of the cam plate 8 fixed to the detection main body 20. Therefore, the sliding rod 21 is
1 and is supported by the connecting plate 13. The fixed plate 12 is loosely fitted with a fixed guide 7 provided in parallel with the cam plate 8.
1 is restricted in the rotation direction. The position detection microswitches 17 and 18 are provided in the stop position detection unit 15 and the movement start position detection unit 16 of the detection main body 20, respectively, and operate at each position by the pressing of the operation rod 19. The sliding rod 21 is provided with a hole detection terminal 5. The hole detecting terminal 5 is provided such that the sliding rod 21 is the starting point 1 of the cam groove 9.
0a is located on a straight line connecting the position detection microswitch 17 and the operating point 10c, and faces the hole detection sensor 6 and is within the detection range of the hole detection sensor.
Is turned ON.

The method of detecting the presence or absence of a drilling device according to the present invention will be described. The tip of the tracing stylus 3 is opposed to the drilling position of the workpiece and the fluid is supplied to the first supply port 20a from the state shown in FIG. When the inner cylinder 1 of the perforation detecting device is advanced (leftward in FIG. 2), the sliding rod 21 moves along the fixed guide 7 via the connecting plate 13 connected to the fixed plate 12 at the rear end of the inner cylinder 1. The guide pin 11 of the sliding rod 21 is moved forward by the cam plate 8.
The sliding rod 21 moves along the cam groove 9 from the starting point 10 a of the cam groove 9, and moves forward with the inner cylinder 1, the fixed plate 12 and the communication plate 13 while sliding on the support portion of the communication plate 13.
(FIG. 4 arrow direction). However, when reaching the point 10b of the cam groove 9, the hole detecting terminal 5 of the sliding rod 21 moves along the cam groove,
The sensor is completely separated from the hole detection sensor 6, is out of the detection range of the hole detection sensor 6, and the detection circuit (not shown) is turned off.
When the inner cylinder 1, the shaft 2 and the like further advance, the guide pin 11 moves along the cam groove 9, the hole detection terminal 5 returns to the original position, returns to the detection range of the hole detection sensor 6, and the detection circuit Becomes ON. By this operation, the normal operation of the hole detection sensor 6 can be confirmed. On the other hand, the operation terminal 19 provided on the fixed plate 12 of the inner cylinder 1 moves, moves away from the position detection microswitch 18, and the movement of the inner cylinder 1 is confirmed. If the inner cylinder 1 continues to advance further and there is a perforation at a predetermined position on the workpiece, the tip of the tracing stylus 3 enters the processing hole, and the position detection microswitch 17 of the stop position detector 15 is operated. At the time (point 10c of the cam groove 9), the hole detection sensor 6 is turned off.
If F is not reached, it means that an effective hole is present.

However, when there is no hole, the probe 3
Of the stop position detection unit 15 of the inner cylinder 1 is further advanced.
7 is activated. Since the tracing stylus 3 is stopped, the shaft bar 2 stops against the urging force of the spring 4, so that the mounting plate 14 and the hole detection sensor 6 stop, while the hole detection of the sliding rod 21 is performed. Since the terminal 5 moves forward with the inner cylinder 1, the distance between the hole detection terminal 5 and the hole detection sensor 6 is separated,
The detection circuit of the hole detection sensor 6 is turned off, and detects that there is no hole. As described above, the drilling presence / absence detection device of the present invention can check the operation of the hole detection sensor 6 during the movement from the start of the hole detection operation to the time of the hole detection, so that it is easy to detect the presence / absence of a hole in the workpiece. It can be performed reliably by the device. After the detection of the presence or absence of the hole is completed, the supply direction of the fluid is changed by a direction switching valve (not shown), the fluid is supplied to the second supply port 20b side, and the inner cylinder 1, the shaft 2 and the like are moved to the movement start position detection unit 16 Is returned until the position detection microswitch 18 is operated.

[0010]

As described above, in the device for detecting the presence or absence of perforation as described above, the hole detecting operation can be surely confirmed only by a single hole detecting sensor and a hole detecting terminal with a single cam plate, compared with the conventional device. In addition, the structure can be simplified and an effect that is easy can be achieved. Further, since the operation of the hole detection sensor is checked during the hole detection operation, the detection time does not increase.

[0011]

[Brief description of the drawings]

FIG. 1 is a plan view of the device for detecting the presence or absence of perforation according to the present invention.

FIG. 2 is a side view showing a partial cross section of FIG. 1 of the present invention.

FIG. 3 is a plan view of the device for detecting the presence or absence of perforation as viewed in the direction of arrow A in FIG. 1;

FIG. 4 is a side view as viewed in the direction of arrow B in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inner cylinder 2 ... Shaft bar 3 ... Measuring element 4 ... Spring 5 ... Hole detection terminal 6 ... Hole detection sensor 7 ... Fixed guide 8 ... Cam plate 9 ... Cam groove 11 ... Guide pin 12 ... Fixed plate 13 ... Contact plate 14 ... Mounting plate 15 ... Stop position detecting unit 16 ... Movement start position detecting unit 17,18 ... Position detecting micro switch 19 ... Working rod 21 ... Sliding rod

Claims (1)

(57) [Scope of request for utility model registration] 1. An inner cylinder slidably fitted in an outer cylinder fixed to a frame body and having a fixed plate fixed at one end, and an inner cylinder provided on the frame body when the inner cylinder moves. A first sensor for detecting a movement start position; a second sensor provided on the frame body for detecting a stop position after the movement of the inner cylinder; and a through-hole in the inner cylinder. A loose fit, a stylus is arranged at the tip, and a shaft provided with a spring to urge the stylus forward in the moving direction of the inner cylinder, and can be moved together with the shaft near the rear end of the shaft. a hole sensor provided, positioned to face the hole detection sensor, wherein a fixing plate which is fixed to the contact plate, the contact at right angles with respect to the forward movement direction with the forward movement of the inner tube A hole detection terminal fixed to a sliding rod that slides back and forth on a plate; and a guide pin fixed to the frame and implanted in the sliding rod. Fitted perpendicular to the forward movement direction of the inner cylinder to the sliding rod by
A cam plate provided with a cam groove for reciprocating in the direction, and a loose fit in a through hole of a fixed plate provided in the frame plate and fixed to the inner cylinder, thereby fixing the cam plate and the inner cylinder in parallel. A perforation detection device comprising: a guide;