JPS6317588B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lens polishing machine, and more particularly to a polishing machine capable of polishing convex lenses, concave lenses, and lenses with large or small radii of curvature with one machine.

(Conventional technology) Conventionally, in order to polish lenses with high precision, it was necessary to swing the polishing plate so as to apply even pressure to the lens surface. For this reason, each had no choice but to polish using a dedicated polishing machine. In other words, the pivot point of the polishing plate when polishing a convex lens and the pivot point of the polishing plate when polishing a concave lens are located above and below the position of the lens to be polished in the axial direction about the mounting axis of the lens attachment plate. Because the positions are far apart in the direction, if you try to use one polishing machine for both, you would have to move the entire polishing section, which sets the polishing plate and lens in pressure contact, up and down, which is extremely structurally difficult. Not only is this complicated and expensive, but the accuracy decreases with movement, making it impossible to obtain a highly accurate lens. Also, for lenses with a large radius of curvature and lenses with a small radius of curvature, the pivot point of the polishing plate must be changed considerably during polishing.
For this reason, due to the structure, a uniform pressing force cannot be obtained on the lens of the polishing plate, resulting in an approximate value, which has the disadvantage that lenses with high precision cannot be polished.

In order to improve this problem, the present applicant proposed in Japanese Patent Application No. 15059/1983 an apparatus that can polish convex and concave lenses with various radii of curvature using a single polishing machine, and was able to obtain some results. However, in this invention, the rack of the holder, which is the fulcrum of the oscillating polishing plate, changes slightly as it moves around the pinion of the fulcrum shaft that meshes with the rack, and strictly speaking, a uniform pressing force is applied. The problem was that it was not possible to do so.

(Problems to be Solved by the Invention) Therefore, the present invention further improves such conventional drawbacks and the previous proposal, and improves the polishing of lenses for concave and convex
It has a structure that allows polishing with a wide range of radius of curvature to be achieved with a single polisher, and the selection and adjustment operations are easy, and the swinging fulcrum does not move during polishing and is always at a constant position relative to the lens surface. The purpose is to obtain a polishing machine that can be held and polished.

(Means for Solving the Problems) As a means for achieving this, the present invention provides a fulcrum moving body that is attached to a machine frame erected on a machine base and can move in the vertical direction; a holder that is slidably fitted to the oscillating body and connected to either the lens polishing plate or the lens sticking plate of the polishing section installed on the machine stand; a holding body side rack provided on the holding body, a machine side rack attached to the machine frame so as to be slidable in the vertical direction, a fulcrum shaft pivoted at the fitting center of the rocking body, and the fulcrum. A pinion on the holder side that is attached to one end of the shaft and meshes with the holder side rack provided on the holder, a pinion on the machine side that is attached to the other end of the fulcrum shaft and meshes with the machine side rack, and a swinging body. a locking means attached to the oscillator side that locks the movement of the holder and fixes the holder side rack;
It is equipped with a locking means on the machine side that is attached to the machine base and engages with and disengages from a rack on the machine side to lock the movement of the rack, and the movement of the fulcrum moving body moves the fulcrum shaft to a set position in the vertical direction of the polishing reference line of the polishing section. The lens is polished by setting the lens in an adjustable manner and swinging the holder about the fulcrum shaft.

(Function) Then, by such means, the rack on the machine side is locked and the rack on the holder side is freed.
For example, when the moving device is moved upward, one pinion of the fulcrum shaft rolls on the rack on the machine base side, and the other pinion rotates accordingly, so the rack on the holder side that meshes with this pinion falls relatively. As a result, the swinging fulcrum is raised relative to the lens to be polished. Next, leave the rack on the machine side free, fix the other rack on the holder side to the pinion, and swing the holder.The holder swings left and right around the fulcrum shaft, polishing the lens into a concave lens with equal pressure. be able to. When polishing a convex lens, the moving device is lowered and the fulcrum shaft is positioned below the lens to perform rocking polishing in accordance with the above operation.

(Example) An example of the configuration of the present invention shown in the drawings will be described in detail below.

1 is a machine base, and 2 is a lens polishing plate for polishing the lens L, which is mounted on the machine base 1 so as to be rotationally driven by a drive motor 3 installed on the machine base 1. Reference numeral 4 denotes a lens attachment plate to which a lens L is attached, and is attached to the lower end of a hairpin 7 at the tip of a support arm 6 slidably fitted to a holder 5 with a screw 7'. An air cylinder 8 is attached between the support arm 6 and the holder 5 for the lens sticking plate 4, and the lens sticking plate 4 is pressed against the microwave polishing plate 2. Configure. In this example, the lens polishing plate 2 was attached to the machine stand 1 side, and the lens sticking plate 4 was attached to the holder 5 side.
Conversely, the lens sticking plate 4 may be attached to the machine stand 1 side, and the lens polishing plate 2 may be attached to the holder 5 side. 9 is a fulcrum moving body which can move up and down with respect to the holding body 5;
In addition, the rail 1 provided on the machine frame 1a erected on the machine stand 1
The protruding body 9a on the upper part of the fulcrum moving body 9 is provided with a hole 11 into which a threaded rod 13 that is connected and hangs down is screwed into the handle 12 attached to the upper plate of the machine frame 1a. The fulcrum moving body 9 is mounted so that it can be moved up and down by rotation of 12. Further, a rocking body 14 is rotatably fitted into the fulcrum bearing 9b at the lower end, and an opposing sliding groove 15 is formed in the groove portion 14a of the tilt adjustment plate 14b on the front surface of the rocking body 14.
Projections 5a formed at both ends of the holding body 5 are slidably fitted into this. Reference numeral 16 denotes a fulcrum shaft, which is pivotally connected to the fulcrum bearing 9b of the fulcrum moving body 9, and has a first pinion 17 and a second pinion 18 attached to both ends thereof, respectively. Reference numeral 19 denotes a machine side rack formed in a plate shape, which is fitted between mounting plates 20 fixed to the rear surface of the machine frame 1a, and the mounting plates 20 are inserted into elongated holes 19a formed in the machine frame side rack 19. The pin 21 of the fulcrum shaft 16 is inserted, and the machine side rack 19 is slidably mounted up and down, and the first pinion 17 of the fulcrum shaft 16 is fitted.
mesh with. Reference numeral 22 denotes a rack on the holder side, which is formed on one side of the rear concave cavity 5b of the holder 5, and meshes with the second pinion 18 of the fulcrum shaft 16. 2
Reference numeral 3 denotes a swing drive body, which is attached to the upper end of the fulcrum moving body 9, and whose rotating shaft 24 is a telescopic power transmission having a universal joint with the drive shaft of a drive motor 25 installed on the machine frame 1a. It is rotatably connected via a shaft 26, connected to one end of a swinging rod 28 provided on the rotating shaft 24, and the other end is pivotally connected to one side of the swinging body 14. Reference numeral 29 denotes a locking device for the holding body side rack 22, in which one sliding groove 15 of the oscillating body 14 is cut out, and an L-shaped clamping plate 30 is attached to this.
and attach the clamping plate 30 to the inclination adjustment plate 14b with a tightening screw 32 having a handle 31, and by rotating the handle 31, the protrusion of the holder 5 fitted in the sliding groove 15 5a is tightened and fixed with the clamping plate 30, and the holding body side rack 22 and the second pinion 18 are
lock. Reference numeral 33 is a locking device for the machine side rack 19, in which a push-out ring 36 is provided on the rod 35 of the air cylinder 34 attached to the side surface of the mounting plate 20, and the tip of the rod 35 is connected to the base end of the L-shaped notch plate 37. The ring 39 is fitted into the rod 35 protruding from the notch plate 37, and the ring 39
A spring 38 is stretched between the ring 39 and the notch plate 37, and a nut 40 for adjusting the spring tension is screwed onto the tip of the ring 39, so that the tip of the notch plate 37 is formed on one side of the machine rack 19. Locking hole 19
b, and when starting polishing, the air cylinder 34 is activated by switching the air switching valve (not shown), and the push-out ring 36 of the rod 35 releases the notch plate 37 from the locking hole 19b, thereby starting the machine. The stand side rack 19 is set in a free state. Further, after the drive motor 25 is turned off, the notch plate 37 is engaged with the locking hole 19 by switching the air switching valve, and is removably disposed so as to lock the machine rack 19.

With this structure, when polishing a convex lens with a large radius of curvature S, first fix the machine rack 19 with the notch plate 37.
On the other hand, the holding body side rack 22 is operated by rotating the handle 31 to move back the tightening screw 32, loosen the clamping plate 30, release the lock from the swinging body 14, and free the holding body side rack 22. Handle 1
2 to rotate the screw rod 13, the fulcrum moving body 9 to which it is screwed moves upward along the rail 10. As this movement progresses, the first pinion 17 at one end of the fulcrum shaft 16, which is pivotally connected to the fulcrum moving body 9, rises while rolling on the fixed machine side rack 19. The pinion 18 also rotates in the same direction, causing the holder-side rack 22 meshed with it to be relatively lowered, and the oscillating body 14 fitted on the fulcrum shaft 16 is eventually moved relative to the holder 5. As a result, the height of the swinging center point of the fulcrum shaft 16 is set at an upper position with respect to the polishing reference line XX passing through the lens surface on the upper surface of the lens polishing plate 2 of the polishing section It can be set to the position of the radius of curvature S, which is the initial setting value. Then, the handle 31 is rotated, the tightening screw 32 is screwed in, the protrusion 5a is clamped by the clamping plate 30, and the holder side rack 22 and the second pinion 18 are locked. When the air switching valve is switched in this state, the air cylinder 34 is operated to disengage the notch plate 37 from the locking hole 19b, thereby setting the machine rack 19 in a free state. Thereafter, when each drive motor 3, 25 is started, one drive motor 3 rotates the lens polishing plate 2, and the other drive motor 25 rotates the rotation shaft 24 via the transmission shaft 26, and the eccentric cam 2
7 reciprocates the swinging rod 28 up and down, the swinging body 1 pivotally attached to the lower end of the swinging rod 28
4 reciprocates around a fulcrum shaft 16. As a result, the inclination adjustment plate 14b of the rocking body 14 is integrally fixed with the holder 5 by the locking device 29 as described above, so that the holder-side rack 22 of the holder 5
is integrated with the second pinion 18 and rotates about the fulcrum shaft 16 to reciprocate the holder 5. At the same time, the lens attachment plate 4 draws an arc with the focal point of the convex lens to be polished as the axis and the fulcrum shaft 16 with a predetermined radius of curvature S via the support arm 6 attached to the tip thereof. By rotating back and forth, the lens L attached to the lens attachment plate 4 can be polished to a set value of curvature. During the above operation, the first pinion 17 of the fulcrum shaft 16 also rotates, but the machine rack 19 that meshes with it is in a free state, so this machine rack 19 moves up and down. As a result, it can operate smoothly. When the polishing is finished and both drive motors 3 and 25 are stopped, the rotation of the lens polishing plate 2 is stopped and the other oscillating body 14 is moved to the fulcrum shaft 16.
Since the machine rack 19 that engages with the first pinion 17 moves up and down due to the reciprocating rotation of the locking mechanism 1, it is necessary to align the locking hole 19b with the notch plate 37 of the locking device 33. For this purpose, a position detection device (not shown) consisting of a sensor that detects light transmitted through the slit body and the slit body is provided on the fulcrum shaft 16 or the machine side rack 19, etc., so that the machine side rack 19 can be locked. When the hole 19b is moved to the notch plate 37 position, the air cylinder 34 is actuated by the output signal of the position detection device to pull the rod 35 and lock the notch plate 37 via the spring 38. Connect the rack 19 on the machine base side to the machine base 1 by engaging it with the hole 9.
It is fixed at . Then, preparations for the next operation are completed.

Also, when polishing a concave lens, its radius of curvature
The distance corresponding to S' may be set to the distance between the lens surface stuck on the lens sticking plate 4 and the center of the fulcrum shaft 16. To do this, operate the locking device 29 in the same manner as above to unlock the holder side rack 22 and the second pinion 18, and then lock the handle 1.
2 in the opposite direction to the above, the fulcrum moving body 9 is lowered, and the fulcrum shaft 16 is moved to the lens polishing plate 2 of the polishing section A.
Set it at a predetermined position below the polishing reference line XX passing through the upper lens surface, and then lock the holder side rack 22 and the second pinion 1
8 and lock device 3 using the air switching valve.
3 to free the rack 19 on the machine side, and then start both drive motors 3 and 25.
When the oscillator 14 operates, the lens attachment plate 4 attached to the holder 5 integrated with the oscillator moves around the focal point of the concave lens to be polished and around the fulcrum shaft 16 having a predetermined radius of curvature S'. By reciprocating in an arc, the lens L stuck on the lens sticking plate 4 can be polished to a set value of curvature.

(Effects of the Invention) As described above in detail with respect to the embodiments, the present invention can convert a concave lens or a convex lens, and furthermore, a lens with a small radius of curvature from a lens with a large radius of curvature to a lens with a large radius of curvature, without moving the polishing part. It is possible to polish even lenses with one polishing machine and without the need for special attachments.
The switching adjustment operation also allows the fulcrum shaft to be easily set to the desired position by simultaneously moving the pinions that mesh with both racks up and down, and the polishing body during polishing can be moved as one unit by fixing the fulcrum shaft and rack. Therefore, polishing is performed by rotating back and forth in an arc around the fulcrum axis at right angles to the lens surface, that is, with a pressing force directed toward the focal point.
It is possible to efficiently polish various lenses with extremely high precision without causing any unevenness. In addition, even if the fulcrum moving body is moved up and down according to the lens curvature, the position of the hairpin and support arm relative to the machine base remains almost the same, making it extremely easy to attach an autoloading device that automatically supplies the lens. It has excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the present invention;
The figure is a cross-sectional plan view of the fulcrum bearing part, Figure 3 is a perspective view of the main parts, Figure 4 is a partially cutaway perspective view of the locking device of the machine rack, and Figure 5 is an explanatory diagram of the polishing trajectory. shows. DESCRIPTION OF SYMBOLS 1... Machine base, 2... Lens polishing plate, 4... Lens sticking plate, 5... Holder, 9... Fulcrum moving body, 13... Screw rod,
14... Rocking body, 15... Sliding groove, 16... Fulcrum shaft, 1
7...first pinion, 18...second pinion, 19...
Machine side rack, 19b...locking hole, 22...holding body side rack, 29...locking device, 30...clamping plate, 32
...Tightening screw, 33...Lock device, 34...Air cylinder, 35...Rod, 37...Notch plate.

Claims (1)

[Claims] 1. A fulcrum moving body that is attached to a machine frame erected on the machine base and can move in the vertical direction, a swinging body that fits into the fulcrum moving body and can rotate back and forth, and a swinging body that can freely slide on the swinging body. A holder that is connected to either the lens polishing plate or the lens sticking plate of the polishing section installed on the machine base, the holder side rack provided on the holder, and the holder that is connected to the machine frame in the vertical direction. A rack on the body side that is slidably attached, a fulcrum shaft that is pivotally connected to the fitting center of the oscillating body, and a holder that is attached to one end of the fulcrum shaft and meshes with the rack on the holder side that is provided on the holder. A pinion on the body side, a pinion on the body side that is attached to the other end of the fulcrum shaft and meshes with the rack on the body side, and a oscillating body that is attached to the oscillating body to lock the movement of the holder and fix the rack on the holder side. and a locking means on the machine side that is attached to the machine base and locks the movement of the rack by engaging with and disengaging from the rack on the machine side, and the movement of the fulcrum moving body causes the fulcrum shaft to be aligned with the polishing reference line of the polishing section. 1. A lens polishing machine, which is adjustable in a set position in the vertical direction, and polishes a lens by swinging a holder about the fulcrum shaft.