JPH03279116A - Work reversing device - Google Patents

Abstract

PURPOSE:To prevent misplacement of a work in reversing in a circular work reversing device of the optical element machining device in the caption by providing a pair of holding claws for holding the work on a reversing frame so that the work which is carried in is adsorbed by an adsorbing device, moved to the claw position, held by the claws and reversed. CONSTITUTION:When a circular work 1 which is carried in by a conveyer 2 is stopped at the center of a reversing device, a work adsorbing pad 15 is lowered by cylinders 17 and 20 so as to adsorb the work 1. Then, the work 1 is raised to the center height of a flat claw 11 and a V-shaped claw 12 by the cylinder 20, and both the claws 11 and 12 are closed by cylinders 13 and 13' so as to hold the work 1. then, adsorption is released and the adsorption pad 15 is retrieved and then, a reversing frame 9 is reversed. Then, the work is held by the adsorption pad 15 again to be return to the conveyer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is mainly used in an optical element processing apparatus, when a circular workpiece is intermittently conveyed by a conveyance device. This invention relates to a work reversing device for reversing a workpiece by 180° with high precision.

(Prior Art) Conventionally, as a device for reversing a conveyed object by 180 degrees using a conveying device, Japanese Patent Publication No. 57-20213 discloses a device for reversing a work being conveyed.

4 and 5 are a front view and a plan view showing the above-mentioned apparatus. A pair of reversing frames 9 are provided, and a centering device 3 is provided.
and a cylinder 4 for operating it, and a chucking claw 5 for the workpiece 1 that has been carried in, and a rotating shaft 7 for holding the workpiece 1.
An actuator 6 is provided to raise the workpiece 1 until its center coincides with the center of the workpiece 1, and chucking claws 5 are provided vertically opposite each other so that the workpiece 1 is in a chucking state.

In order to reverse the work l using the above device, when the work 1, which has been continuously conveyed by the conveyor 2, stops at approximately the center of the reversing device, the centering device 3, which is in a fully open state, is activated by the operation of the cylinder 4. Center workpiece 1 by pinching it from all sides. Next, at the same time as the centering device 3 is opened, the chucking claw 5 is stopped by the actuator 6 by pinching the workpiece 1 at a position centered on the rotating shaft 7. The centering device 3 is closed by the cylinder 4 to hold the workpiece 1, and the reversing motor 8 rotates the workpiece 1 together with the reversing frame 9 around the rotating shaft 7.
80" is reversed. At the same time as the reversal is completed, the centering device 3 is opened, the chucking claw 5 is also opened, and the work 1 is lowered in the reversed state and placed on the conveyor 2 at its original position.

(Problems to be Solved by the Invention) In the conventional apparatus described above, the chucking claw 5 and the centering device 3 are in an open state until the workpiece 1 is placed on the conveyor 2 after the reversal is completed. There was a problem that the position of the

Furthermore, when transporting a workpiece set on a transport pallet, such as in a lens processing device, it is necessary to provide a relief on the pallet to avoid interference between the upper and lower chucking claws 5 and the transport pallet. However, there was a problem in that the shape of the pallet became complicated.

Further, since the reversing frame 9 is separated into left and right sides, a transmission mechanism for transmitting the rotational force of the reversing electric motor 8 is required, resulting in a complicated mechanism and an increase in the size of the reversing device.

The present invention has been made in view of the above problems, and includes:
It is an object of the present invention to provide a mechanically simple and compact workpiece reversing device that prevents displacement of the workpiece when reversing the workpiece when reversing a circular workpiece.

(Means for Solving the Problems) The work reversing device of the present invention includes a conveyor that intermittently conveys a circular work, a reversing frame whose both ends are supported by a rotating shaft above the conveyor, one shaft of the rotating shaft, and its drive. A reversing actuator with connected shafts, two claws that hold and center a circular workpiece placed symmetrically opposite the reversing frame, a cylinder that operates it, and a workpiece suction pipe at the tip. It is composed of a suction device that has a lifting mechanism that lifts a brought-in circular workpiece to the height of the claw while suctioning and holding it, and also lifts it to a height that does not interfere with the reversing frame when reversing.

(Function) In order to reverse a workpiece using the device of the present invention, when the circular workpiece that has been intermittently conveyed by the conveyor stops at approximately the center of the reversing device, the suction pipe is lowered by the lifting mechanism to the top surface of the circular workpiece on the conveyor. Then, it picks up the circular workpiece and rises to the center height of the claw.

Next, the two claws in the fully open state are closed by the cylinder, holding and centering the circular workpiece, and stopping suction, and the lifting mechanism raises the suction pipe to a height where it will not interfere with the reversing frame when reversing.

Next, with the circular workpiece being held by the claws, the reversing actuator moves the circular workpiece together with the reversing frame.
Flip it 80 degrees. After the reversal is completed, the suction pipe is lowered to the upper surface of the circular workpiece held by the claw, and the circular workpiece is suctioned.

After the claws are fully opened and the suction pipe is lowered to the height of the conveyor, suction is stopped and the circular workpiece is placed in its original position.

Embodiments of the present invention will be described in detail below with reference to the drawings.

(Embodiments) (First Embodiment) FIG. 1 is a perspective view showing a first embodiment of a work reversing device according to the present invention, and FIG. 2 is a pneumatic circuit diagram of a pawl driving section.

In FIG. 1, the reference numeral 9 indicates an inversion frame having rotating shafts 7 provided at both ends thereof. The rotating shaft 7 is supported by a bearing 28, and one shaft thereof is connected to a drive shaft 8a of the reversing actuator 8 via a coupling 23. In addition, the reversing frame 9 includes a flat mold 1) and a V-shaped mold 12 at positions symmetrically facing each other, and a cylinder 1 for operating them.
3.13゛ is provided. In order to always hold the circular workpiece 1 in a fixed position between the flat mold 1) and the V-shaped mold 12, the cylinder 13 that operates the flat mold 1) is provided with a stopper 21 whose stroke can be adjusted. always stops at a fixed position.

In FIG. 2, 22 is a pressure regulating valve for making the thrust of the cylinder 13' weaker than that of the cylinder 13. By making the thrust of the cylinder 13° weaker than the thrust of the opposing cylinder 13, the cylinder 13 reliably abuts against the stopper 21 and stops. 29 is a 1i solenoid valve, and the operation of two cylinders 13 and 13'' is controlled by one solenoid valve.

In Fig. 1, 14 indicates a suction device that sucks the circular workpiece 1 conveyed from the conveyor 2 and lifts it up to the height of the claw. A suction base 1 provided with a cylinder 17 that moves a hollow shaft 16 up and down, and a guide bush 18 that guides the cylinder 17 and the up and down movement.
9 and a cylinder 20 for raising and lowering the suction base 19. Further, although not shown, a suction hose is connected to the upper end of the hollow shaft 16. The suction hose is connected to the vacuum generator and the hollow shaft 1
It is provided so that the air inside 6 can be sucked. Sho 30
is a connecting arm between the cylinder 17 and the hollow shaft 16, and 31 is a fixing ring.

Next, the operation of the work reversing device of this embodiment will be explained.

When the circular workpiece 1 that has been intermittently conveyed from the conveyor 2 stops almost at the center of the reversing device, the workpiece suction vibrator 15 is lowered by the cylinders 17 and 20, and after suctioning the circular workpiece 1 on the conveyor 2. , cylinder 20
The circular workpiece 1 is raised to the center height of the flat die 1) and the V-shaped die 12 in a fully open state while being attracted by the suction vibrator 15.

Next, the flat mold 1) and the V-shaped mold 12 are closed by the cylinders 13 and 13' to hold and center the circular workpiece. After stopping suction, the cylinder 17 raises the suction vibrator 15 to a height where it does not interfere with the reversing frame 9 during reversal.

Next, while the circular workpiece 1 is held by the flat mold 1) and the V-shaped mold 12, the reversing frame 9 and the reversing frame 9 are reversed by 180° by the reversing actuator 8. After the reversal is completed, the suction vibrator 15 is moved to the flat type 1) and the V-shaped type 1 by the cylinder 17.
The robot descends to the upper surface of the circular workpiece 1 held at 2 and sucks the circular workpiece 1.

Next, the flat die 1) and the V-shaped die 12 are fully opened by the cylinder 13 and ]3゛, and after the circular work 1 is lowered to the height of the conveyor by the cylinder 20, suction is stopped and the circular work 1 is no longer moved. It is placed in a 180° inverted position.

According to this embodiment, the cylinders 13 and 13° for operating the flat mold 1) and the V-shaped mold 12 are linked by one electromagnetic valve 29, so that control is easy.

In addition, since the holding force of the circular workpiece 1 by the flat mold 1) and the V-shaped mold 12 can be easily adjusted by the pressure regulating valve 22,
It is possible to hold workpieces such as lenses without damaging them.

(Second Embodiment) FIG. 3 is a perspective view showing a second embodiment of the work reversing device according to the present invention.

The feature of this embodiment is that it is configured to be moved up and down by a motor 25 instead of the vertical movement cylinder 17.2o in the first embodiment. The other parts are the same as those in the first embodiment, so the same parts are denoted by the same numbers and the explanation thereof will be omitted.

Although not shown, the rotation of the motor 25 is transmitted to the housing 27 by a transmission mechanism such as a timing belt. Although not shown in the figure, the housing 27 is provided with a nut on its inner diameter that engages with a ball screw provided on the outer diameter of the hollow shaft 26, and by rotating the housing 27, the hollow shaft 26 moves up and down. The hollow shaft 26 is provided with a workpiece suction vibrator 15 and a rotation prevention mechanism (not shown) at its tip.

By controlling the rotation amount of the motor, the suction vibrator 15
It is possible to set the stop position arbitrarily and with high precision.

Next, the workpiece reversing operation of the workpiece reversing device of this embodiment will be explained.

When the circular work l that has been intermittently conveyed from the conveyor 2 stops at approximately the center of the reversing device, the work suction vibrator 15 is lowered by the motor 25, and after suctioning the circular work 1 on the conveyor 2, the motor 25 Accordingly, circular work 1
is raised to the center height of the flat mold 1) and the V-shaped mold 12 in a fully open state while being attracted by the suction vibrator 15.

Next, the flat mold 1) and the V-shaped mold 12 are closed by the cylinders 13 and 13°, and the circular work 1 is held and centered. After stopping suction, the motor 25 raises the suction vibrator 15 to a height where it does not interfere with the reversing frame 9 during reversal.

Next, while the circular work l is held by the flat mold 1) and the V-shaped mold 12, the reversing actuator 8 rotates the reversing frame 9 together by 180°. After the reversal is completed, the suction vibrator 15 is moved by the motor 25 to the flat type 1) and the V-shaped type 12.
It is lowered to the upper surface of the circular workpiece 1 held by the robot, and the circular workpiece 1 is sucked.

Next, the cylinders 13 and 13° are used to fully open the flat mold 1) and the V-shaped mold 12, and the motor 25 is used to fully open the circular workpiece 1.
After being lowered to the height of the conveyor, suction is stopped, and the circular workpiece 1 is placed at the original position in a 180° inverted state.

According to this embodiment, the suction vibrator 1 is controlled by the motor 25.
5 can be positioned at multiple points in the vertical direction, so even if the thickness of the circular workpiece 1 changes, the suction vibrator 15 can always be brought into contact with the top surface of the circular workpiece 1. Therefore, even when circular workpieces l having a plurality of different thicknesses are intermittently conveyed by the conveyor 2, it is possible to reverse the circular workpieces without requiring any adjustment of the machine.

(Effects of the Invention) As described above, according to the workpiece reversing device of the present invention, the circular workpiece is held and centered by the flat type and the V-learning type, and the circular workpiece is sucked by the suction vibrator. Since the circular workpiece is transferred to the conveyor by the receiver, it is possible to prevent the circular workpiece from being misaligned.

In addition, the suction vibrator sucks the circular workpiece from above and supplies the circular workpiece to the reversing device, so even when conveying the workpiece set on the conveyance pallet, such as in lens processing equipment, the conveyance pallet is There is no need to provide a relief on the pallet to avoid interference with the chucking claws, and the shape of the conveying pallet can be simplified.

Furthermore, since the reversing frame is integrated, there is no need for a transmission mechanism for transmitting the rotational force of the reversing actuator, making it possible to provide a mechanically simple and compact wobble reversing device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the work reversing device according to the present invention, FIG. 2 is a pneumatic circuit diagram of the claw drive unit, and FIG.
A perspective view showing a second embodiment of the work reversing device according to the present invention, and FIGS. 4 and 5 are a front view and a plan view showing a conventional device. 1...Circular workpiece 2...Conveyor 7...Rotating axis 8...Reversing actuator 8a...Drive shaft 9...Reversing frame 1)...Flat type 12...V learning Type 13...Flat type heavy duty cylinder 13°...V-shaped heavy duty cylinder 14...Suction device l5...Suction pipe 16...Hollow shaft 17...Hollow shaft upper and lower cylinder 18... Guide bushing 19...Suction base 20...Cylinder 21 for suction base up and down...Stopper 22...Pressure adjustment valve 23...Coupling 25...Hollow shaft Up and down motor 26...Hollow Shaft 27...Housing 28...Bearing 29...Solenoid valve 30...Connecting arm 31...Fixing ring

Claims (1)

[Claims] (1) In a device that intermittently transports circular workpieces on a conveyor line, a reversing frame with rotatable shafts at both ends is placed above the conveyor and is opened and closed by an actuator to hold and center the circular workpiece. Two claws are provided on the reversing frame at positions symmetrical and opposite to each other, and a suction pipe for sucking the circular workpiece at the tip thereof is provided. 1. A work reversing device comprising: a suction device having a lifting mechanism that raises a suction pipe to a height that does not interfere with a reversing frame during reversal;