JPH02106255A - Device for detecting workpiece combinedly used for air blow of machine tool - Google Patents

Abstract

PURPOSE:To efficiently carry out air blow for a workpiece chuck from a very close position to the front of the workpiece chuck by providing a posture changeover means for changing over a nozzle pipe between an operating posture in which the end portion thereof is positioned in front of the workpiece chuck and a retracted posture separated from the workpiece chuck. CONSTITUTION:Prior to feeding a workpiece to a workpiece chuck 2, a nozzle pipe 40 in a first position is changed over to an operating posture by a posture changeover means 61. As a result, the end portion of the nozzle pipe 40 is brought close to the front of the workpiece chuck 2 to blow air out of the air blow-out port 40b on the end portion of the nozzle pipe 40. Thereby, the air blow can be carried from a position very close to the workpiece chuck 2 enabling efficient removal of foreign matter like chips, etc. deposited on the workpiece chuck 2. In this case, it is desirable to carry out the air blow while rotating the workpiece chuck 2.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is an air blower that can perform air blowing to a workpiece chuck in various machine tools and checking the posture of a workpiece gripped by the workpiece chuck. This invention relates to a dual-purpose workpiece detection device.

(Prior art) Workpiece chucks used in various machine tools must be blown with air to remove adhering chips and other foreign matter that may prevent the workpiece from being gripped properly before gripping the workpiece. No bam. On the other hand, when the workpiece is gripped by the workpiece chuck, it is also important to check whether the workpiece is gripped in a normal posture. If only the former air blow is performed, the work may not be gripped properly due to the presence of residual foreign matter that could not be removed by the air blow, or because the work itself was not fed to the work chuck in its normal posture. If only the latter workpiece posture check function is used, abnormality in the gripping posture of the workpiece may frequently be detected due to foreign matter adhering to the workpiece chuck.

For this reason, both the air blow and the workpiece gripping posture checking function are required, but conventionally, the means for air blowing and the workpiece detection means for checking the gripping posture of the workpiece have been used separately. It had to be set up separately.

(Problem to be Solved by the Invention) When the means for air blowing and the workpiece detection means for checking the gripping posture of the workpiece are provided separately as described above, both means must be controlled separately. Therefore, the control system becomes complicated, leading to a significant increase in overall costs.

(Means for Solving the Problems) In order to solve the conventional problems as described above, the present invention has the following features:
An air blow nozzle pipe is supported at a lateral position of a work chuck in a machine tool so as to be movable in the axial direction of the work chuck, and the tip of the nozzle pipe is located in front of the work chuck. posture switching means for switching between a working position and a retracted position away from the work chuck; and a position switching means for moving the nozzle pipe in the axial direction of the work chuck so that the tip of the nozzle pipe in the working position is in the front side of the work chuck. position switching means for switching to a first position where the nozzle approaches the front surface of the workpiece, a second position which is a suitable distance forward from the front surface of the workpiece gripped by the workpiece chuck, and a third position where the nozzle approaches the front surface of the workpiece; An air blower for a machine tool, wherein the tip of the tube is provided with an air outlet for discharging air toward the workpiece chuck, and a switch mechanism or sensor is provided to detect contact between the tip of the nozzle tube and the workpiece. This paper proposes a dual-purpose workpiece detection device.

(Operation of the Invention) Before feeding the workpiece to the workpiece chuck, the nozzle pipe in the first position is switched to the working attitude by the attitude switching means. As a result, the tip of the nozzle pipe approaches the front surface of the workpiece chuck, and by discharging air from the air outlet of the tip of the nozzle pipe, the workpiece chuck is blown with air from a very close position. It is possible to efficiently remove foreign substances such as chips adhering to the surface. In this case, it is desirable to perform air blowing while rotating the work chuck.

By returning the nozzle pipe to the retracted position after the air blow is completed, there is no fear that the nozzle pipe will interfere with the supply of the workpiece to the workpiece chuck.

Once the workpiece chuck has gripped the workpiece, before starting machining, the nozzle pipe is moved forward from the first position to the second position, then switched from the retracted position to the working position, and then retreated from the second position to the third position. By moving the nozzle tube, the tip of the nozzle tube can be brought close to the front surface of the workpiece that is normally gripped by the workpiece chuck. Therefore, by rotating the workpiece together with the workpiece chunk, if the workpiece is held in an abnormal tilted posture, the front surface of the workpiece will come into contact with the tip of the nozzle pipe.
The switch mechanism or sensor works to detect an abnormality in the gripping posture of the workpiece.

When the gripping posture check of the workpiece is completed, the nozzle pipe is returned to the retracted position from the working position at the third position, or is moved forward to the second position and then returned from the working position to the retracted position, and then returned to the retracted position from the working position, and By moving backwards to the position,
A series of air blows and workpiece gripping posture checks are completed.

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

In Figures 1 and 2, 1 is a numerically controlled machine tool (N
It is a machine tool such as C machine), and is equipped with a work chuck 2 that is rotationally driven around a horizontal axis 2a. Reference numeral 3 denotes a work conveyance device, which includes a large number of work pallets 5 that can be rotated at equal intervals on a horizontal circulation path 4.

Reference numeral 6 denotes a work transfer device, which includes a rotating frame 9 that can rotate around a horizontal support shaft 8 with respect to a base frame 7, and a rotating frame 9 that is perpendicular to the axis of the horizontal support shaft 8.
A main shaft 1 supported by the main shaft 1 and capable of sliding in the axial direction and rotating on its axis.
0, and an arm 11 fixed perpendicularly to the tip of the main shaft 10, the arm 1 in the manipulator 12 is used.
A movable support member 13 is rotatably supported at the tip of the movable support member 13 so as to be rotatable around an axis 13a parallel to the main shaft 10, and a loading work gripping means 14 and an unloading work gripping means are provided at both ends of the movable support member 13. 15.

The movable support member 13 has workpiece gripping means 14 at both ends.
The movable support member 13 is rotated in forward and reverse directions within a range of 180 degrees by an air motor 16 that supports the movable support member 13 with a rotating shaft. By rotating the movable support member 13 in the forward and reverse directions, the two workpiece gripping means 14. Is, the workpiece holder on the side far from the main spindle 10 can be alternately positioned at the transfer position A and the inner standby position B. As shown by the solid line in Figure 2, when the main shaft 10 is vertically erected by the rotation of the rotating frame 9 and the arm 11 is horizontally lowered, it is positioned directly above the workpiece transfer position C in the workpiece transfer device 3, facing downward. Furthermore, as shown by the imaginary line in FIG. 2, the spindle 10 is horizontally laid down by the rotation of the rotating frame 9, and the arm 11 is laid down at a predetermined angle toward the machine tool 1 side by the rotation of the spindle 10, as shown in FIG. When this is done, it faces the workpiece chuck 2 of the machine tool 1 in a concentric state.

The work gripping means 14. Is has the same structure, and as shown in FIG.
Chuck body 19 fixed to 8, the chuck body 1
9, three rack gears 20 in the circumferential direction supported so as to be movable in the radial direction, a chuck claw 21 attached to each rank gear 20, a pinion gear 22 engaged with each rank gear 20 and pivotally supported within the chuck body 19, each A cylindrical rack gear 23 that meshes with the pinion gear 22 at the same time as the pinion gear 22, and a cylinder unit 24 supported by the movable support member 13.
, the piston rod 24 of the cylinder unit 24
It is composed of a movable shaft 25 that is coupled to a and is slidable in the axial direction and supports the cylindrical rack gear 23 only in a rotatable manner, and a floating plate 26 for pressing the workpiece. 23, each chuck claw 21 is moved through each pinion gear 22 and rack gear 20.
can move in a centripetal direction to grip the work W, and conversely, by pushing out the cylindrical rack gear 23 by the cylinder unit 24, the chuck claws 21 move in a centrifugal direction to release the work W. I can do it.

The floating plate 26 is supported at the center of the tip of the chuck main body 19 through a support shaft 27 attached at the center so that it can swing in the direction of 360 degrees, and each of the chunk claws 21 has a radius It is provided with a cut groove 28 into which it is loosely fitted so as to be movable in the direction.

29 is a motor attached to the arm 11 via a bracket 30, and its rotating shaft 29a rotates the work gripping means 14 or 15 in the standby position B!
The rotating body 31, which is oriented in the radial direction of the workpiece 18 and fixed to the rotating shaft 29a, has an O-ring or the like that elastically contacts the inner surface of the rotary disk 18 of the workpiece gripping means 14 or 15 at the standby position B. A friction drive ring 32 is fitted, and the rotary disk 18, motor 29, rotating body 31, and friction drive ring 32 constitute a rotation drive means 33 for the work gripping means 14 or 15 in the standby position B. has been done.

34 is an air blow nozzle, and its air discharge port 34a is connected to the workpiece gripping means 14 in the standby position B.
Alternatively, a placket 35 is attached to the arm 11 so as to face the peripheral part of the work W held by the arm 15 from the front.
It is attached via a support rod 36 and a bracket 37. The support rod 36 is parallel to the axial direction of the rotary disk 18, and the fixing position of the support rod 36 to the bracket 35 can be arbitrarily adjusted in the length direction of the support rod 36. can be fixed by rotating at any angle around the support rod 36 using the bracket 37, and the fixing position can also be adjusted in the length direction of the support rod 36.

In FIG. 1, reference numeral 38 denotes a workpiece detection device that also serves as an air flow according to the present invention, and the manipulator 12
It is attached to the base frame 7 of. This device 38
As shown in FIGS. 9 to 11, the nozzle tube 40 for air blowing is attached to the tip of the main shaft 39 parallel to the axis 2a of the workpiece chuck 2 at right angles.

As shown in FIGS. 4 to 6, a movable base 42 is supported on a fixed frame 41 of the device 38 so as to be able to reciprocate in the axial direction of the main shaft 39 (in the direction of the axial center 2a of the workpiece chuck 2). At the same time, a cylinder unit 44 for reciprocating the movable base 42 is attached via a drive plate 43 fixed to the front end of the movable base 42, and the main shaft 39 is fixed to the rear end side of the movable base 42. It is rotatably supported by the bearing plate 45 and the driving plate 43. 46 is a rotational drive mechanism for the main shaft 39;
A pinion gear 47 is fixed to the drive plate 43, and a bracket 4 is connected to the pinion gear 47 and attached to the lower end of the drive plate 43.
8 and a rack gear 50 that is driven up and down by a cylinder unit 49 attached via a cylinder unit 8. Therefore, by raising and lowering the rack gear 50 using the cylinder unit 49, the main shaft 39 can be rotated in any direction, forward or reverse, via the pinion gear 47.
This rotation of the main shaft 39 causes the nozzle pipe 40 to swing.

A first abutment plate 51 and a second abutment plate 52 are fixed to the main shaft 39. The first contact plate 51 is the ninth
As shown in the figure, when the nozzle pipe 40 is rotated by the main shaft 39 in a direction away from the work chuck 2 side until the nozzle pipe 40 is in the vertically standing retracted position, the bracket 48
It comes into contact with the first stopper screw 53 attached to.

Further, a second stopper screw 54 and a third stopper screw 55 which act alternatively on the first contact plate 52 are provided. These stopper screws 54 and 55 are
attached at appropriate intervals in the axial direction of the main shaft 39 to a movable plate 57 supported movably in the axial direction of the main shaft 39 by a bracket 56 fixed to the movable table 42 and the bearing plate 45; By moving the movable plate 57 with a cylinder unit 58 attached to the bracket 56, both stopper screws 54, 55 can be alternatively switched to the operating position with respect to the second contact plate 52.

As shown in FIG. 4, when the second stone bar screw 54 is switched to the position where it acts on the second abutment 52, the nozzle pipe 40 is moved from the retracted position to the workpiece chuck 2 as shown in FIG. When rotated to the side by the main shaft 39,
When the nozzle pipe 40 reaches the first operating position El in which the tip of the nozzle pipe 40 is located on the rotation locus of the work gripping surface 2C of each chuck jaw 2b of the work chuck 2, the second The abutting plate 52 abuts against the second stopper screw 54. Further, when the third stopper screw 55 is switched to the operating position with respect to the second contact plate 52 by the cylinder unit 58, the nozzle pipe 40 is rotated further from the first operating position E1 as shown in FIG. hand,
When the tip reaches the second operating posture E2 located on the detection surface Wa of the workpiece W gripped by the cotton chuck 2, the second contact plate 52 contacts the third stopper screw 55. come into contact with Of course, each stopper screw 54.55
By adjusting the movement in and out, the angles of the first and second working postures El and E2 can be adjusted. In addition, 59 is a lock plate that is screwed into the upper end of the screw 54 and 55 for both S7 pars, and the center part is the lock screw 6.
0 on the movable plate 57.

61 is a stroke limiting mechanism for the main shaft 39 (cylinder unit 44), which includes a screw shaft 62 parallel to the main shaft 39 with one end fixed to the drive +/1i 43, and a screw shaft 62 that is screwed into the screw shaft 62 so that its position can be adjusted. a deformed elongated nut 63 and two guide plates 64 erected on the fixed frame 41.
It is composed of a movable stopper 65 that moves laterally in between, and a cylinder unit 66 that drives this movable stopper 65. The nut 63 includes a large-diameter contact portion 63a that cannot move through the through-hole 64a of the guide plate 64, and a small-diameter contact portion 63b that can move through the through-hole 64a of the guide plate 64.
And a detection target portion 63C for a proximity switch is formed.

In FIGS. 10 and 11, 67 is a guide plate, and 68 and 69 are proximity switches.

The main shaft 39 is connected to the drive plate 4 by a cylinder unit 44.
When the main shaft 39 is returned to the backward limit position by the cylinder unit 44 as shown in FIGS. 4 and 10, the nozzle pipe 40 is located at the first position F, and when the main shaft 39 is moved forward by the cylinder unit 44 with the movable stomper 65 being retracted to the non-operating position by the cylinder unit 66 as shown in FIG. As shown in FIG. 11X, the main shaft 39 moves to the stroke limit where the large-diameter contact portion 63a of the nut 63 contacts the guide plate roller 4, and the nozzle pipe 40 reaches the second position G.

Next, as shown by the imaginary line in FIG. 5, the movable stopper 65
When the main shaft 39 is moved backward by the cylinder unit 44 with the main shaft 39 being moved forward to the operating position by the cylinder unit 66, the small diameter light beam portion 63 of the nut 63 that has moved through the guide plate 64 as shown in FIG.
At the position where b comes into contact with the movable striker 7 parr 65, the main shaft 3
9 stops, and the nozzle pipe 40 is located at a third position H, which is retreated from the second position G by a certain distance. The second position G can be changed by adjusting the position of the nut 63 with respect to the screw shaft 62, and the third position H is always a position set back from the second position G by a certain distance l.

As shown in FIGS. 1O and 11, the nozzle pipe 40 has a workpiece contact detection head 40a and an air discharge port 40b opening toward the workpiece chuck 2 at its tip. On the other hand, an arm 70 is fixed to the tip of the main shaft 39 as shown in FIGS. 7 and 8.
A bracket 72 is pivotally attached to the tL end of 0 by a support shaft 71 that is perpendicular to the axial direction of the main shaft 39.
The base of the nozzle pipe 40 is fixed to the bracket 72. A detection plate 73 is connected to the bracket 72 along the arm 70, and a wire 74 is inserted between the detection plate 73 and the arm 70 to draw the detection plate 73 toward the arm 70. A tension spring 75 is interposed. 76 is a guide for turning the wire 74;
77 is a stopper for the detection target plate 73.

Therefore, by the biasing force of the spring 75 and the stopper 77, the nozzle pipe 40 is held in a position extending in the extension direction of the arm 70, but in the direction shown by the arrow in FIG.
That is, the direction opposite to the direction in which the air discharge port 40b opens,
When the head 40a of the nozzle pipe 400 is pressed, the nozzle pipe 40 and the detection plate 73 are moved around the support shaft 71 by the spring 7.
5, the detection target plate 73 is separated from the stopper 77. A proximity switch and chia 8 for detecting the movement of the detected plate 73 are attached to the arm 70.

Next, to explain how to use the workpiece, as shown by the solid line in FIG. 3, and the workpiece holding means 14 for loading, which is in the transfer position, is positioned directly above the workpiece transfer position C in the workpiece transport device 3, facing downward. In this state, the main shaft 10 is moved in the workpiece pressing direction F, and the workpiece gripping means 14, 15 are lowered to a predetermined level.

Next, the work pallet 5 at the work transfer position C of the work transfer device 3 is raised by a lifter (not shown), and
The workpiece to be processed on the workpiece pallet 5 is pressed from below against the floating plate 26 of the workpiece gripping means 14, and in this state, the chuck claws 21 of the workpiece gripping means 14 are moved in a centripetal direction, thereby removing the floating plate. The unprocessed workpiece W being pressed against the workpiece 26 is held by the workpiece holding means 14. After that, the main shaft 10 is moved backward in the backward direction R to the stroke limit, and then the rotary frame 9 is reversely rotated 90 degrees to obtain the state shown by the imaginary line in FIG. 2, that is, the main shaft 10 is laid down horizontally. The arm 11 is returned to a vertically standing state.

The receiving of the unprocessed workpiece W is completed in the above manner, but once the processing of the workpiece W held by the workpiece chuck 2 of the machine tool 1 is completed, the movable support member 13 is rotated 180 degrees by the air motor 16. With the unloading workpiece gripping means 15 positioned at the workpiece transfer position A and the loading workpiece gripping means 14 positioned at the standby position B, the main shaft 10 is rotated by a predetermined angle, as shown in FIG. Then, the arm 11 is tilted toward the machine tool 1 side, and the unloading workpiece gripping means 15 is opposed to the workpiece chuck 2 of the machine tool 1.

Incidentally, the workpiece receiver is the workpiece gripping means 14 that was at the transfer position A.
Alternatively, when the movable support member 13 is rotated to move the rotating body 31 to the standby position, the rotating body 31 is attached to the inner surface of the rotary disk 18 of the workpiece gripping means 14 or 15 that has reached the standby position B as shown in FIG. The friction drive ring 32 will automatically come into sliding contact. Of course, at this time, the workpiece gripping means 1
There is no risk that the work W held by the workpieces 4 and 15 will enter the air blow nozzle 34 from the side and collide with the nozzle 34.

Next, the main shaft 10 is moved again in the workpiece pressing direction F, and the floating plate 26 of the unloading workpiece gripping means 15 is pressed against the processed workpiece W held by the workpiece chuck 2 on the machine tool 1 side. In this state, the work chuck 2 on the machine tool 1 side is released, and each chuck claw 21 of the work gripping means 15 is moved in the centripetal direction as described above, and the work chuck 2 on the machine tool 1 side is released.
The processed workpiece W held in the workpiece gripping means 1
5. Thereafter, the main spindle 10 is forcibly moved in the backward direction R to the stroke end, and the machined workpiece W is separated from the workpiece chuck 2 on the machine tool 1 side.

Thereafter, the rotating body 32 is rotated by the motor 29 shown in FIG.
It is forcibly driven to rotate via the drive ring 32 and the rotary disk 18. Then, by discharging air from the air discharge port 34a of the air blow nozzle 34, air is blown from the front toward the periphery of the workpiece W to be processed that rotates together with the workpiece gripping means 14, and the entire circumference of the workpiece W is If there is any foreign matter adhering to the surface or outer end surface,
This is blown away by the air.

Simultaneously with this air blowing to the unprocessed workpiece W, the workpiece chuck 2 is blown with air by the workpiece detection device 38 which also serves as an air blower. That is, when the nozzle pipe 40 is in the retracted position shown in FIG. 9 and is in the -7iF position shown in FIG. It is rotated to the first working position El shown in the figure. As a result, as shown in FIG.
By discharging air from the air outlet 40b of the nozzle pipe 40 while the work chuck 2 is in a rotated state, the work chuck 2 approaches the front surface of the workpiece W, that is, each chuck jaw. The workpiece gripping surface 2C of 2b, etc., can be blown with air to blow away foreign matter adhering to it and clean it. After air blowing has been performed for a certain period of time, the main shaft 39 is rotated in the forward direction by the rotary drive mechanism 46 shown in FIG. 5, and the nozzle pipe 40 is returned to the retracted position shown in FIG. 9.

When the air blowing to the workpiece W to be processed and the air blowing to the workpiece chuck 2 is completed, the movable support member 13 is rotated, and the workpiece gripping means 14 for loading, which is holding the workpiece W to be processed, is moved to the workpiece receiver. After moving to the transfer position A, the spindle 10 is moved again in the workpiece pressing direction F, and the unprocessed workpiece W is pressed against the workpiece chuck 2 of an example of a machine tool. In such a state, each chuck claw 21 of the loading workpiece gripping means 14 is moved in a centrifugal direction in conjunction with each other to release the gripping action of the workpiece W to be processed,
Subsequently, the workpiece W is gripped by the workpiece chuck 2 on the machine tool 1 side.

Thereafter, the main spindle 10 is forcibly moved in the backward direction R to the end of the stroke to remove the work gripping means 14 from the workpiece W to be processed, and the main spindle 10 is further rotated in the reverse direction to move the arm 11 as shown by the imaginary line in FIG. After standing up, the rotary frame 9 is rotated forward to raise the main shaft 10, the arm 11 is horizontally lowered toward the workpiece transfer device 3, and the movable support member 13 is rotated by 180 degrees. The processed workpiece W held by the unloading workpiece holding means 15 can be positioned directly above the workpiece transfer position C in the workpiece transfer device 3. On the other hand, in the workpiece transfer device 3, since a specific workpiece pallet 5 set for receiving the processed workpiece W is called to the workpiece transfer position C, the main shaft 10 is moved in the workpiece pressing direction F. The work gripping means 14 is moved. After lowering Is to a predetermined level, the work pallet 5 is raised by a lifter, and the processed work W (or empty work pallet 5) already transferred onto the work pallet 5 is gripped by the work gripping means 15. Press it against the lower end surface of the processed workpiece W. In such a state, after releasing the chuck claw 21 of the workpiece gripping means 15 as described above, the main spindle 10 is forcibly moved in the backward direction R to the stroke end, and the workpiece pallet 5 is lowered by the lifter, thereby removing the workpiece. The processed workpiece W held by the gripping means 15 is transferred to the workpiece pallet 5 for picking up the processed workpiece.
Translated above.

The loading of the unprocessed workpiece and the unloading of the processed workpiece are completed above, but before starting machining of the unprocessed workpiece W supplied to the workpiece chuck 2, the workpiece detection device 38 which also serves as an air blower The gripping posture of the workpiece W gripped by the workpiece chuck 2 is checked. That is, while taking the retracted position shown in FIG. 9, the nozzle pipe 40 at position F shown in FIG.
9, it is moved to the second position G shown in FIG. 11X.

Next, after switching so that the third stopper screw 55 corresponds to the second light plate 52 shown in FIG. Earth axis 3
9, the nozzle pipe 40 is switched to the second operating position E2 shown in FIG. As a result, as shown in FIG. 11, the head 40a of the nozzle pipe 40 reaches a position a suitable distance forward from the detection surface Wa of the workpiece W held by the workpiece chunk 2. Thereafter, as shown in FIG. 11Y, the main shaft 39 is moved backward with the movable stopper 65 of the stroke limiting mechanism 61 switched to the operating position.
The nozzle pipe 40 in the second working position E2 is moved to the second position G.
to the third position H. As a result, as shown in FIG. 11, the head 40a of the nozzle pipe 40 comes close to the detection surface Wa of the work W held by the work chuck 2 and being rotated by the work chuck 2.
When the workpiece W is normally gripped by the workpiece chuck 2, the head 40a of the nozzle pipe 40 and the detection surface Wa of the workpiece W do not come into contact with each other. In other words, the nozzle pipe 4 in the second working position E2 and in the third position H
The nut 63 in the stroke limiting mechanism 61 is positioned so that the head 40, a of the workpiece 0 faces the detection surface Wa of the workpiece W normally gripped by the workpiece chuck 2 with a small gap therebetween. It must be adjusted according to the thickness of the workpiece W.

However, if for some reason the gripping posture of the workpiece W with respect to the workpiece chuck 2 is not normal, and if the workpiece W is rotated even slightly, the nozzle pipe may be damaged as the workpiece W rotates. 40 is pressed outward by the detection surface Wa of the workpiece W. As a result, the nozzle pipe 40 and the detection plate 73 resist the biasing force of the spring 75, as shown by the imaginary line in FIG. Since the proximity switch 78 detects this swing, an abnormality in the gripping posture of the workpiece W can be detected from this detection signal, and necessary measures can be taken automatically.

In the above embodiment, the nozzle pipe 40, which is movable about the support shaft 71, the spring 75, the detection plate 73, and the proximity switch 78 are used to detect contact between the nozzle pipe head 40a and the workpiece. Although the mechanism is configured, contact between the tip of the nozzle tube 40 and the work can also be detected by attaching a suitable sensor to the tip of the nozzle tube 40 to detect contact with the work. Even in this case, in order to prevent unreasonable force from acting on the nozzle pipe 40, the nozzle pipe 40 is moved against the biasing force of the spring 75 to prevent the workpiece W from being applied to the nozzle pipe 40, as in the embodiment.
It is desirable that the structure be configured to be able to swing in a direction away from.

Further, the nozzle pipe 40 is placed in the operating position E1. in which the tip thereof is located on the 1ii side of the work chuck 2. A posture switching means for switching between E2 and a retracted posture away from the work chuck 2 includes a rotational drive mechanism 46 for the main shaft 39, first and second contact plates 51 and 52, a first stopper screw 53,
and second and third stopper screws 54 and 55 whose positions can be changed, but the present invention is not limited thereto. Of course, although the first working position El and the second working position E2 are set, the air blow and the workpiece gripping position check may be performed only in the second working position E2.

Further, a position switching means for moving the nozzle pipe 40 in the axial direction of the work chuck 2 and switching it from the -position IF to the third position 1 is connected to the cylinder unit 44 for moving the main shaft 39 and the stroke limiter 1. 61, but is not limited thereto.

(Effects of the Invention) As described above, according to the air blow and work detecting device of the present invention, it is possible to efficiently blow air to the work chuck from a position very close to the front surface of the work chuck before gripping the work. At the same time, it is also possible to reliably check the gripping posture of the workpiece after gripping the workpiece, but the nozzle pipe for air blow also serves as a workpiece detection member for checking the gripping posture of the workpiece, and therefore the posture switching is difficult. The means and position switching means are also used for air blowing and for checking the gripping posture of the workpiece, compared to the case where the means for air blowing and the means for checking the gripping posture of the workpiece are provided separately. hand,
The number of parts is greatly reduced, the structure of the entire device including the control system is extremely simple, and it can be implemented at low cost. Further, there is no problem in which the means for air blowing and the means for checking the gripping posture of the workpiece are operated at the same time by mistake, causing them to interfere with each other.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view showing the workpiece transfer device in use, Fig. 2 is a side view of the same, Fig. 3 is a vertical side view showing the main parts of the transfer device, and Fig. 4 is the main part of the transfer device. 5 and 6 are vertical sectional side views of the essential parts showing an embodiment of the invention; FIG. 7 is a side view showing the support structure of the nozzle pipe; FIG. 8 is a front view of the same; 9r12I is a front view illustrating each posture of the nozzle pipe, and FIGS. 1O and 11 are cross-sectional plan views of essential parts illustrating switching of the position of the nozzle pipe. 1... Machine tool, 2... Work chuck, 3...
Workpiece conveyance device, 6... Workpiece transfer device, 14,
DESCRIPTION OF SYMBOLS 15... Workpiece gripping means, 38... Workpiece detection device also used for air blowing, 39... Main shaft, 40... Nozzle pipe, 40a... Workpiece contact detection head, 40b...
・Air discharge port, 44, 49.66...Cylinder unit, 46...Rotation drive mechanism, 51.52...Temporary contact, 53-55...Screw for stopper, 57...
- Movable plate for changing the screw position for the stopper, 61... Stroke limiting mechanism, 62... Screw shaft, 63... Deformed long nut, 63a... Large diameter force portion, 63b... Small diameter contact Part, 64.67... Guide plate, 65...
・Movable stopper, 70...arm, 71...support shaft,
73... Detection plate, 74... Wire, 75...
Tension spring, 78... Proximity switch. Patent applicant Matsuura Iron Works Co., Ltd. Figure 3 Figure D Figure

Claims (1)

[Claims] An air blow nozzle pipe is supported at a lateral position of a work chuck in a machine tool so as to be movable in the axial direction of the work chuck, and the tip of the nozzle pipe is located in front of the work chuck. posture switching means for switching between a working position and a retracted position away from the work chuck; and a position switching means for moving the nozzle pipe in the axial direction of the work chuck so that the tip of the nozzle pipe in the working position is in the front side of the work chuck. position switching means for switching to a first position where the nozzle approaches the front surface of the workpiece, a second position which is a suitable distance forward from the front surface of the workpiece gripped by the workpiece chuck, and a third position where the nozzle approaches the front surface of the workpiece; An air blower for a machine tool, wherein the tip of the tube is provided with an air outlet for discharging air toward the workpiece chuck, and a switch mechanism or sensor is provided to detect contact between the tip of the nozzle tube and the workpiece. Dual-purpose workpiece detection device.