JPH0612242B2 - Contact detection device - Google Patents

Description

The present invention relates to a contact detection device that is used for automatic measurement and centering of a machine tool and that generates an electrical signal by contact with an object to be measured.

Conventionally, as a contact detection device used for automatic measurement and centering of a machine tool, a spindle that is rotatably provided on a spindle head and has a tool insertion hole at its tip, and a shank that can be inserted into the tool insertion hole. A measuring tool provided with a probe on one side, and a measuring tool provided on the other side (pull-stud side) of the shank of the measuring tool, the measuring tool being provided on the measuring tool when measuring an object to be measured. A light-emitting body that blinks with the battery current,
A light receiving body that detects blinking of the light emitting body through a through hole formed in the pull stud provided in the inner end portion of the main shaft and a pull rod inserted in the main shaft, and a measuring element is compressed through the through hole. A hose for supplying compressed air for supplying air is known (Japanese Patent Laid-Open No. 55-1139).
09 publication).

However, the above-mentioned contact detection device must be equipped with a light emitter and a light receiver, and moreover, in order to detect blinking of the light emitter by the light receiver and to supply compressed air to the contact point, a pull stud or pull Since it is necessary to make a through hole in the rod,
There is a problem that the structure is complicated as a whole and it cannot be applied to a machine tool in which a through hole cannot be formed in a pull rod or the like due to the strength and the like.

In addition, a probe, a light emitter, a pull stud with a through hole,
In addition, it is necessary to assemble a printed board or the like for controlling the blinking of the light emitter over the entire length from one end to the other end of the shank, which also complicates the structure and makes maintenance difficult.

An object of the present invention is to provide a contact detection device which has no restriction on the structure on the machine tool side, can be used for any machine tool, etc., and has a simple structure and easy maintenance. And

In order to achieve the above-mentioned object, the present invention is provided with a flow hole for a fluid such as air to be blown to the object to be measured, and a contact body that is brought into contact with the object to be measured and displaced from the equilibrium position, and this contact. A moving body that is moved in the axial direction by the displacement of the body, a switch that detects the movement of the moving body and issues a contact signal, and the contact body and the moving body in the state where the contact body is separated from the object to be measured. The main body of the working mechanism is equipped with a position restoring mechanism for restoring the equilibrium position, and a joint which is detachably connected to the joint device and allows a fluid such as air to flow through the flow hole to the flow hole of the contact body. The switch is detachably attached to a shank attached to the switch, and one output line of the switch is grounded to the main body of the device, and the other output line of the switch is insulated from the output line grounded to the main body of the device. Be done Through the serial coupling device has a structure connected to the Jiyointo connected to the signal processor.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 and 2 show an embodiment of the present invention.
A contact body 1 which is brought into contact with the object to be measured and is displaced from the equilibrium position, a moving body 2 which is moved in the axial direction by the displacement of the contact body 1, and a movement of the moving body 2 is detected to generate a contact signal. The switch 3 and a position restoring mechanism 4 that restores the contact body 1 and the moving body 2 to the original equilibrium position when the contact body 1 is separated from the object to be measured are mainly configured.

The contact body 1 has a contact head having outer peripheral surfaces 5a and 5b which are brought into contact with an object to be measured at a tip portion thereof, and a probe 5 having a collar portion 5c at an intermediate portion thereof is provided with a fitting hole 6a of a locator 6. The collar portion 5c to the tip 6b of the locator 6
Are fitted and engaged with and fixed to the locator 6 by a set screw 6c. The probe 5 is provided with a through hole 5d for a fluid such as air to be blown onto the surface to be measured of the object to be measured. The flow hole 5d is formed along the axial direction of the probe 5, and one end of the flow hole 5d branches in the axial direction and the radial direction at the tip portion of the probe 5 to form the outer peripheral surfaces 5a, 5a.
b, and the other end is opened to the outer peripheral surface of the probe 5 by a communication hole 5e opened in the radial direction of the probe 5. The locator 6 has the tip 6b side,
The large-diameter portion 6d and the probe 5 having a smaller diameter than the large-diameter portion 6d
Has a taper portion 6e that is gently tapered so as to be narrowed toward the front end direction, and on the rear end 6f side,
A member having a taper portion 6g having a diameter smaller than that of the taper portion 6e and being tapered in the opposite direction. An annular holder 8 attached to the housing 7 has six true spheres 9a ,.
It is fitted through 9f. Also, this locator 6
On the rear end surface 6h of the large-diameter portion 6d, two round holes 6i are formed at symmetrical positions in the diametrical direction of the locator 6, and one end of the probe 5 has one end inside the large-diameter portion 6d. A communication hole 6j is provided in the diameter direction so as to communicate with the communication hole 5d through the communication hole 5e and the other end thereof communicates with the round hole 6i.

The housing 7 is a hollow cylindrical member having a fitting hole 7a at the front end and a flange portion 7b at the rear end side. The housing 7 is fixed to the body 10 via a bolt 11 and is attached to the front end thereof. Is provided with one push screw hole 7c penetrating in the radial direction, and a plurality of set screw holes 7d are displaced from the push screw hole 7c in the radial direction at equal intervals in the circumferential direction. It is provided through. A push screw 7e and an adjusting screw 7f are screwed into the screw holes 7c and 4d, respectively. Further, the flange portion 7b of the housing 7 is provided with a through hole 7g having one end opened to the inner peripheral surface of the housing 7 and the other end opened to the rear end surface of the flange portion 7b. The holder 8 is a housing 7
Is fitted into the fitting hole 7a with a gap s, and is attached to the housing 7 by a plurality of mounting bolts 12, and its axial center position is finely adjusted by the plurality of adjusting screws 7f. . This holder 8 has a through hole 8
a is provided coaxially with the screw hole 7c of the housing 7 so as to penetrate therethrough in the radial direction, and five V-grooves 8b, ..., 8f are formed on the inner peripheral surface thereof including the through hole 8a. They are formed at equal intervals in the direction. Further, the true spheres 9a, ..., 9f are fitted in the through holes 8a and the V-grooves 8b, ..., 8f, and the front end surface 6k of the large diameter portion 6d of the locator 6 and the outer peripheral surface of the taper portion 6e. Is abutted against and its movement is restrained.

One end of the through hole 8a of the holder 8 is a washer 13
The compression coil spring 14 fitted to the
The washer 13 is abutted against the push screw 7e and fitted into a. By adjusting the screwing amount of the push screw 7e, the pressing force of the true sphere 9a in the through hole 8a against the locator 6 is increased. It can be adjusted from the outside. Further, among the respective V grooves 8b, ..., 8f, the V grooves 8d and 8f arranged on both sides of the through hole 8a and the holder 8 are provided.
The V groove 8e arranged to face the through hole 8a in the diametrical direction is formed to be slightly smaller than the other two V grooves 8b and 8c, and is fitted into these deep V grooves 8d, 8e and 8f. A gap ε can be created between the true spheres 9d, 9e, 9f and the locator 6. Due to this clearance ε and the pressing force of the spherical sphere 9a in the through hole 8a against the locator 6 by the compression coil spring 14, the locator 6 is always 3
The structure is in contact with the true spheres 9a, 9b, 9c for centering and is positioned by these.

On the other hand, the moving body 2 is a rod provided on the rear end 6f of the locator 6 with the steel ball 15 interposed therebetween and the shaft center of which is aligned with the shaft center of the locator 6.
Inner body 17 having a substantially hollow cylindrical shape fixed by
Is mounted movably in the axial direction via a linear ball bearing 18. A groove 2a having a conical inclined surface forming an angle of 45 ° with the axis of the moving body 2 is formed at the tip of the moving body 2, and the rear end 6f of the locator 6 is also aligned with the axis of the locator 6. On the other hand, a groove 6l having a conical slope with an angle of 45 ° is formed, and the steel ball 15 is fitted into these grooves 2a and 6l. Further, the rear end portion of the moving body 2 has a shaft hole 1 of the inner body 17.
7a and a projecting portion 2b is formed on the end face thereof, and a spring bearing 19 having a shaft hole 19a in the entire rear end portion is fitted by inserting the projecting portion 2b into the shaft hole 19a. ing. Further, two round holes 17b are provided at the tip of the inner body 17 so that the round hole 6b of the locator 6 is formed.
i are provided at positions symmetrical to each other in the diametrical direction of the inner body 17, and a groove 17c communicating with the flow hole 7g of the housing 7 is formed along the circumferential direction on the outer peripheral surface thereof. Round hole 17b and groove 1
7c are communicated with each other by an L-shaped flow hole 17d. Further, between the inner body 17 and the large-diameter portion 6d of the locator 6, the two round holes 17b and the two round holes 6i provided in the inner body 17 and the two round holes 6i are provided at both ends, respectively.
Two pipes 20 each inserted with a ring interposed are arranged. The pipes 20 are adapted to follow the movement and rotation of the locator 6 in the axial direction.

The switch 3 is provided with a detector 3a at the tip and has two output lines 3b and 3c at the rear end. The axis of the switch 3 is aligned with the axis of the moving body 2 to form a cylindrical shape. It is attached to the switch holder 21 and attached to the inner body 17. The switch holder 21 is screwed into the screw portion because it is cut at the rear end side of the shaft hole 17a of the inner body 17, and is fixed to the inner body 17 by the set screw 22, and by adjusting the screwing amount, A gap between the detector 3a and the protrusion 2b of the moving body 2 is appropriately maintained. The main body of the switch 3 is fitted into the switch holder 21 almost completely, and even if the detector 3a is pushed by the protrusion 2b of the moving body 2 beyond the allowable stroke, the end face of the spring receiving member 19 is pushed. Contacts the tip of the switch holder 21, prevents the moving body 2 from moving further in the direction of arrow A, and prevents the switch 3 from being damaged. Further, the shoulder portion of the switch holder 21.
The compression coil spring 2 is provided between 21a and the spring receiving member 19.
3 is fitted in a compressed state, and the moving body 2 is pressed against the contact body 1 with an appropriate pressure by the biasing force of the compression coil spring 23.

When the outer peripheral surfaces 5a and 5b of the tip of the probe 5 come into contact with the object to be measured and the probe 5 is displaced, the steel ball 1
The moving body 2 is moved in the direction of arrow A against the biasing force of the compression coil spring 23 via 5, and the switch 3 detects this movement. Further, when the object to be measured is separated from the tip of the contact body 1, the moving body 2 is returned to the original equilibrium position by the urging force of the compression coil spring 23.
Further, the contact body 1 also returns to the original equilibrium position via the steel ball 15, but at this time, the contact body 1 is accurately positioned by the centering true spheres 9a, 9b, 9c. ing. Thus, the compression coil spring 23, the steel ball 15,
The centering true spheres 9a, 9b, 9c constitute a position restoring mechanism 4 for accurately restoring the moving body 2 and the contact body 1 to the original equilibrium position.

In addition, the body 10 has a protruding portion 1 that protrudes in the radial direction.
0 ', and this protrusion 10' serves as a receiving portion for receiving air and electric signals. That is, the projecting portion 10 ′ of the body 10 is provided with a through hole 10 a penetrating in the axial direction, and a joint 26 is attached to the through hole 10 a via a front bush 24 and a rear bush 25. The front bush 24 is provided with a shaft hole 24a at its axial center position.
It is fitted in a fitting hole 10b on the tip side of a and is fixed to a projecting portion 10 'of the body 10 by a cap 27 which is bolted. A plug 28 is tightened and attached by a nut 29 to the shaft hole 24a. The joint 26 is a substantially cylindrical member having a collar portion 26a in the middle, has a side hole 26b having one end opening to the internal space of the member and the other end opening to the through hole 10a, and the tip end thereof is It is slidably fitted in the front bush 24, and its rear end is slidably fitted in the rear bush 25 bolted to the body 10. Further, the compression coil spring 3 is provided inside the joint 26.
In the state in which 0 is compressed, one end thereof is brought into contact with the end face of the plug 28, and the other end thereof is the shoulder portion 2 inside the joint 26.
6c is fitted in contact with 6c, and by the biasing force of this compression coil spring 30, a flexible connection can be made between the joint device K connected to the air supply source provided outside and the device body according to the present invention. It is said. Further, since the flange portion 26a of the joint 26 is restrained from moving in the axial direction by the end faces 24b and 25a of the front bush 24 and the rear bush 25, the sliding stroke of the joint 26 is limited to a certain range. Furthermore, of the two output lines 3b and 3c of the switch 3, one output line 3b is connected to the bolt 16 for fixing the inner body 17 to the housing 7 with a crimp terminal sandwiched between them and grounded inside the device. The other output line 3c is guided while being insulated in the passage 10c in the body 10, and is connected to the plug 28 with the crimp terminal interposed therebetween. The cap 27, the front bush 24, and the rear bush 25 are made of an insulating material, and the switch 3 to the output line 3 are formed.
The contact detection signal transmitted to the plug 28 by c is guided to the joint 26 via the compression coil spring 30.

The body 10 has one end in the through hole 7g of the housing 7 and the other end in the protruding portion 10 'of the body 10.
Each of the through holes 10a is provided with a substantially L-shaped flow hole 10d which is communicated with the through hole 10a. Further, reference numeral 31 in the figure denotes a rubber cover for preventing dust, oil, cutting chips, etc. from entering the inside of the device, and 32 holds the rubber cover 31 and protects the device against external force. It is a lid to give strength. Reference numeral 33 is a shank that is adapted to be mounted on the spindle of a machine tool, and there are various types depending on the machine tool. The main body of the apparatus having the above structure is detachably attached to the shank 33 by the fixing bolts 40. This shank 33 and body 10
By changing the shape of, the device of the present invention can be used for various devices other than the machine tool. Further, 34 is an O-ring, 35 is a breathing hole, and 36 is a closing lid material.

Next, the operation of the present invention will be described.

FIG. 3 shows a usage state of the contact detection device of the present invention. The contact detection device main body is attached to the shank 33 and then attached to the spindle 37 of the machine tool, and the joint 26 has a signal processing device. 38 is connected. In this state, the spindle 37 is actuated to move the contact detection device toward the object to be measured, and the object to be measured is detected. However, it remains on the surface to be measured before or during the measurement. Remove the adhering substances such as cutting chips with air. That is, air is sent into the joint 26 from an air supply source (not shown). The air passes through the side hole 26b of the joint 26, enters the circulation hole 10d of the body 10, and reaches the circulation hole 7g of the housing 7.
Next, it enters the pipe 20 through the groove 17c of the inner body 17, the through hole 17d and the round hole 17b, and then into the through hole 6j of the locator 6. Then, it is discharged from the tip of the probe 5 through the communication hole 5e and the flow hole 5d of the probe 5,
Blow off the deposit on the surface to be measured.

When the contact detection device is further moved after completely removing the deposit on the measured surface of the measured object in this way, the measured object comes into contact with the tip of the probe 5. For example, when the object to be measured comes into contact with the outer peripheral surface 5a above the tip of the probe 5, the contact body 1 swings around the true sphere 9a as a fulcrum, and the rear end 6f of the locator 6 moves upward as shown by an arrow B. Move. At this time, the steel ball 15 rolls in the groove 6l and tries to go out from the conical surface, and as a result, the moving body 2 is compressed by the compression coil spring 23.
It moves in the direction of arrow A against the urging force of. Alternatively, when the object to be measured comes into contact with the outer peripheral surface 5b of the tip portion of the probe 5, the entire contact body 1 is moved in the direction of arrow A, and the moving body 2 is also moved in the direction of arrow A. In this way, the moving body 2 moves in the direction of arrow A against the biasing force of the compression coil spring 23 regardless of which of the outer peripheral surfaces 5a and 5b at the tip of the probe 5 is contacted by the object to be measured. Then, the projection 2b at the rear end of the moving body 2 hits the detector 3a of the switch 3, and the contact inside the switch 3 is closed to detect the contact. This contact detection signal is sent to the joint 26 via the output line 3c.
Is transmitted to the signal processing device 38, processed, and the object to be measured is detected. Since the switch 3 is provided inside the device, the output line 3b of the switch 3 is grounded to the device body, and the output line 3c is connected to the joint 26 which is insulated from the output line 3b, There is no fear of short circuit.

On the other hand, when the object to be measured is separated from the contact body 1, the contact body 1 and the moving body 2 are restored to their original equilibrium positions by the position restoring mechanism 4. That is, the moving body 2 moves in the direction of arrow C by the biasing force of the compression coil spring 23, and returns to the original equilibrium position.
When the moving body 2 returns to the original equilibrium position, the contact body 1 moves in the arrow C direction via the steel ball 15 or moves in the arrow D direction to restore the original equilibrium position. Here, when a force acts on the contact body 1 in the radial direction, the force acts on the contact body 1 in the axial direction by the compression coil spring 23, so that the true spheres 9a, ... Front end surface 6 of large diameter portion 6d
A moment force acts in a direction to cancel the radial force with the contact point with k as a fulcrum, and the contact body 1 returns to the original equilibrium position. At this time, the respective true spheres 9a, ..., 9f are pressed against the outer peripheral surface of the taper portion 6e of the locator 6, but the respective true spheres 9a ,.
, 9f and the taper portion 6e of the locator 6 are in rolling contact, only the axial force acts effectively on the contact body 1, and the restoration of the position is not blocked. Further, when air or the like is caused to flow through the flow holes 5d, 6j and the communication hole 5e of the contact body 1, a force acts on the contact body 1 by the flow of the air or the like. The force is greater in the radial direction in the axial direction and the radial direction of the contact body 1, but each true sphere 9a, ..., 9f rolls on the outer peripheral surface of the taper portion 6e of the locator 6 and the contact body Since it guides 1, the restoration of its position is accurate. In this way, the contact body 1 restores its position no matter what direction the force is applied to the contact body 1 or air or the like flows through the flow holes 5d, 6j and the communication hole 5e in the contact body 1. The mechanism 4 accurately restores the original equilibrium position. Therefore, the object to be measured can always be detected with high accuracy.

In the above embodiment, the output line 3b of the switch 3 is
Is connected to the bolt 16 via a crimp terminal and is grounded, but it may be grounded to other parts of the device.

As described above, the contact detection device of the present invention is provided with a flow hole for a fluid such as air blown onto the object to be measured, and a contact body that is brought into contact with the object to be measured and is displaced from the equilibrium position, The moving body that is moved in the axial direction by the displacement of the contact body, the switch that detects the movement of the moving body and issues a contact signal, and the contact body and the moving body when the contact body is separated from the object to be measured. The device main body provided with a position restoring mechanism for restoring the equilibrium position to the joint device, and a joint which is detachably connected to the joint device and causes a fluid such as air to flow into the flow hole of the contact body through the flow hole, The switch is detachably attached to a shank attached to a main shaft or the like. One output line of the switch is grounded to the main body of the device, and the other output line of the switch is connected to the output line grounded to the main body of the device. Is isolated Since it is configured to be connected to the joint that is also connected to the signal processing device through the joint device, it is not necessary to equip the light emitting body and the light receiving body, and accordingly, the through hole for the pull stud or the pull rod, etc. No need for drilling, the structure is simple overall, and it can be applied to any machine tool or the like.

In addition, the main body of the device, which mainly consists of the contact body and the switch, can be assembled on the tip side of the shank, so that the probe, the light emitting body and the pull stud with the through hole are full length from one end to the other end of the shank. Unlike the above-mentioned prior art that must be assembled over the entire length, it is easy to attach and detach the device body to the shank, and maintenance is easy, and even if the tool mounting hole of the spindle such as machine tools changes. There is an advantage that it is possible to easily deal with it by changing the shank without changing the device body.

Furthermore, one output line of the switch is grounded to the main body of the device, and the other output line is connected to the signal processing device via a joint and a joint device which is insulated from the one output line. Therefore, unlike the above-mentioned prior art, it is not necessary to incorporate a battery in the shank, and there is an advantage that an error due to a short circuit hardly occurs.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the contact detecting device of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a contact detecting device mounted on a spindle of a machine tool. It is a schematic diagram showing a state. 1 ... contact body, 2 ... moving body, 3 ... switch, 4 ...
Position restoration mechanism, 5 ... Probe, 5d ... Flow hole, 6 ...
... Locator, 6d ... Large diameter part, 6e ... Tapered part, 6j
...... Flow hole, 7 ...... Housing, 7g ...... Flow hole, 8 ...
... Retainer, 8b, ..., 8f ... V groove, 9a, ..., 9f ...
… True sphere, 14 …… Compression coil spring, 15 …… Steel ball, 17
...... Inner body, 2a, 6l ...... Groove, 2b ...... Projection part, 17d ...... Flow hole, 3a ...... Detector, 3b, 3c ...
… Output line, 20 …… Pipe, 21 …… Switch holder,
23 ... compression coil spring, 24 ... front bush,
25 …… Riabusuyu, 26 …… Jiyoint, 28 ……
Plug, 30 ... compression coil spring, 10d ... circulation hole,
33 ... Shank, 37 ... Spindle, 38 ... Signal processing device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-55-113909 (JP, A) Actually open 55-7654 (JP, U) Actually open Sho 56-79801 (JP, U) Actually open 56- 83351 (JP, U) Actual opening Sho 58-140404 (JP, U) Actual opening Sho 57-170006 (JP, U)

Claims (1)

[Claims] 1. A flow hole for a fluid such as air to be sprayed onto an object to be measured.
(5d, 6j) and a contact body (1) which is brought into contact with the object to be measured and is displaced from the equilibrium position, and this contact body (1)
A moving body (2) that can be moved in the axial direction by the displacement of
The switch (3) which detects the movement of the moving body (2) and outputs a contact signal, and the contact body (1) and the moving body (2) are set in the state where the contact body (1) is separated from the object to be measured. The position restoring mechanism (4) for restoring to the equilibrium position of (4) and the joint device (K) are detachably connected to allow fluid such as air to flow through the holes (7g, 10d, 1
7d), the device main body equipped with the joint (26) flowing into the flow holes (5d, 6j) of the contact body (1) can be detachably attached to the shank (33) mounted on the spindle of the machine tool or the like. One output line (3b) attached to the switch (3)
Is grounded to the device body, and the other output line (3c) of the switch (3) is the output line grounded to the device body.
The joint (2) is insulated from (3b) and is connected to the signal processing device (38) through the joint device (K).
6) A contact detection device characterized by being connected to 6).