JPS6056863A - Lens holder for lens polishing machine - Google Patents

Abstract

PURPOSE:To enable a lens blank to be easily mounted on a simplified lens holder in which the lens blank sucked by vacuum is smoothly rotatably displaced according to the rotation of a polishing tray without any air leakage. CONSTITUTION:In a vacuum suction system lens holder for an automatic lens polishing machine, a radial ball bearing 14 is forced into an end of a lens holder body 13 removably fixed to an end 12 of a swing arm swingable right and left and displaceably vertically about the neighborhood of the center C of curvature of the polishing surface 11a on the polishing tray 11. Next, a clearance between the inner peripheral surface of a center hole 13A in the holder body 13 and the outer peripheral surface of a small diameter cylindrical portion 15A of a spherical shaft flange 15 is sealed by an U-packing 18 formed of an antifriction material like Teflon. Thus, a lens blank can be easily mounted with a simple construction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a vacuum suction type lens holding device used in an automatic lens polishing machine that continuously and automatically polishes lenses.

[Background of the invention]

Conventionally, when polishing a lens, a lens blank is pasted onto a pitch plate and both sides of the lens are polished. When the polishing is completed, the lens is rapidly cooled and then the lens is removed. The complicated work involved removing the pitch from the lens plate by hitting it with a wooden hammer and then removing the pitch stuck to the lens surface. To complete this lens polishing work, the attaching and peeling work must be done each time one side of each lens is polished, which not only requires a great deal of labor and time, but also requires a lot of effort from the polishing shop. h) I was afraid that I might scratch or damage the lens while removing it.

In order to solve the flaws in F: ff, instead of attaching the lens by pitch, we tried to hold the lens blank by suction (
Grinding machines that have been developed are known. The lens holding device of the known polishing machine is as shown in Fig. 1 (a ball joint: t111+2 (so-called 1 kanzashi) is fixed to a swinging arm 1 that swings from side to side, and the ball joint axis The lens blank 4 is vacuum-adsorbed by the lens blank holder 3 which is connected to the spherical part 2A provided at the tip of the ball joint shaft 20. The body bones of the lens blank holder sandwiching the lens blank are in metal contact with the part 3A, and the ball joint shaft 2 does not rotate.
The relative rotation and floating of the lens blank holder 3 during polishing becomes heavy and unsmooth, and the lens blank 4 is faithfully polished [■ [[][It slides in contact with the polishing plate of 5], and its movement also becomes unsmooth. However, there was a drawback that it was difficult to improve the accuracy of the spherical surface.Additionally, there was a drawback that air easily leaked from the metal contact portion, reducing the ability to attract the lens.

As a suction type lens holder that does not have the disadvantages of the vacuum suction type lens holder described above, the spherical part of the swinging ball joint shaft and the body bones that sandwich this have many small metal balls between them. It is known that a rubber gasket is interposed to form a rolling contact, and a rubber gasket is further interposed to prevent air leakage. However, even in this known lens holder, the pole joint shaft only oscillates and does not rotate, so the tightening of the gasket must be over 7 to prevent air leakage (then the spherical part and the body bone are relative to the metal). The rotation of the target and the body bones that follow the spherical surface of the polishing plate become heavy due to the rocking displacement of the gold, and the ball joint axis and the body bones are relative to the gold. Due to the large swing displacement angle of the lens blank, when mounting the lens blank, a correction device is required to make the surface of the lens holder 141 perpendicular to the ball joint axis. There are drawbacks to doing so.

[Object of the Invention] The present invention solves the above-mentioned drawbacks of the conventional apparatus, and provides a system in which the vacuum-suctioned lens blank can be smoothly rotated and displaced in accordance with the rotation of the polishing plate, there is no air leakage, and the structure is simple. Vacuum suction type lens holding device Z that allows easy installation of lens blanks
The purpose is to provide.

[Summary of the Invention] In order to achieve the above object, the present invention provides a lens polishing machine having a tip of a swinging arm for polishing that can swing around a polishing plate. The lens holder body is connected via a bearing between the lens holder body which is provided on the swinging arm and has a ventilation hole for vacuum suction in the giant center, and the lens holder body which has a ventilation hole for vacuum suction of the lens blank. A body axis flange 7 that is rotatably supported by the lens holding member and is connected to the lens holding member through a ball joint means consisting of a body axis having a through hole in the center, a ball bearing, and a gasket that seals the joint. Furthermore, a low-friction gasket is provided between the ventilation hole of the lens holder main body and the spherical shaft flange, and the lens blank is sucked through the through hole of the ball joint means, and the body axial flange is moved in accordance with the rotation of the polishing plate. It is a technical drawback to construct the lens so that it can rotate together with the lens blank.

〔Example〕

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

Figure f42 is a sectional view showing one embodiment of the present invention, and is a
At one end of the lens holder main body 13, which is removably fixed to the swinging arm tip 12 which can swing left and right around the center of curvature C of the polishing plate 11a of No. 1 and which can be moved up and down,
A radial ball bearing 14 is press-fitted. An original shaft 16 having a spherical portion 16A formed at one end is protruded and screwed toward the center of the body side flange 150 which is rotatably supported by this radial ball bearing 14. 4 = This hole 17 that passes through both the original shaft 16 and the original shaft flange 15 is the lens holder main body 1.
Air vent hole 13B through center hole 13A formed in 3.
The space between the inner circumferential surface of the center hole 13Δ of the lens holder main body 13 and the outer circumferential surface of the small diameter cylinder, g (!
It is sealed with a U-packet 18 made of a low-friction material such as ).

- The spherical part 16A of +HI+ 1.6 is a circular part (receiving surface 1.9A and its lens A') (A') (
held. In addition, the bottom surface of the lens holding hole 1.90 formed at the lower end of the lens holding metal 19 has a hole 2 in the center.
A washer 22 having a diameter of 2A is provided, and this hole 22A is inserted through a through hole 19-B formed at the bottom of the lens holder 19 and a through hole 17 provided in the original shaft 16 and the original shaft flange 15. It communicates with the air vent hole 13B. The washer 22
The suction surface in contact with the lens blank L is formed into a curved surface so as to match the curvature of the contact surface of the lens blank L, and as shown in FIG.
4. The bottom surface of the lens holding hole 19C of the lens holder 19 to which the washer 22 is attached is coated with a thin oil seal to maintain airtightness.

Further, the air vent hole 13 of the lens holder main body 13 communicates with a vacuum port (not shown) via a base 24 and a flexible tube 25.

Since the embodiment shown in FIG.
9 and the polishing surface 11.8 of the polishing plate 11 (widened), a washer 22 having a suction surface with a curvature matching that of the suction surface of the lens blank L, and a lens holder 19 coated with an oil seal. Attach it to the bottom of the lens 4v hole 19C.

Next, the lens blank Ly is inserted into the lens holding hole 19C using a lens rotor (not shown), and the air in the suction groove of the washer 22 is evacuated through the air vent hole 13. In this case, the airtightness inside the lens holder main body 13 is maintained by the U gasket 18, and the airtightness inside the lens holder 19 is maintained by the U gasket 18.
maintained by

Lens holding hole 1 of lens blank L9 lens holding metal 19
9 and then lowering the swinging arm tip 12, the lens flank L is moved as shown in FIG.
contact with the polishing surface 11a of the nti with an appropriate contact pressure. Due to this contact with the lens blank L, a rotational force is applied to the lens holder 19 via the washer 22 in accordance with the rotation of the polisher 1 palm plate. The original shaft 16 that is ball-coupled with this lens holder 19 is tightened with an O-ring packing 21, so the frictional resistance is large (the original shaft 16 and lens holder 19 that are ball-coupled are relatively Does not cause rotation.

However, since the original shaft flange 15 on which the original shaft 16 is fixed is supported by the lens holder main body 13 via the radial ball bearing 4, the lens holder 19 and the spherical shaft 1
6 and the original shaft flange 15 rotate together, so the rotation is extremely smooth. In this case, since the space between the original axis flange 15 and the lens holder main body 13 is closed by the U gasket 18 having an extremely small aerosol coefficient, there is little 1ψ friction resistance due to rotation (and sufficient airtightness can be obtained).

While the lens blank L is in contact with the rotating polishing plate 11, when the swinging arm tip 12 is swung from side to side in FIG. ,
The polishing plate 1 ] of the polishing plate 11 swings approximately around the center of curvature of a. As the lens holder 19 moves along the polishing surface 11'a along with the lens flank L, the center of movement of the lens holder 19 and the original axis 1
The center of oscillation of 6 is almost the same, and the eccentricity of both is small.
The relative displacement of rotation (tilting) about the center is small. Therefore, the frictional resistance between the spherical part 16A and the lens holder 19 and the zero angle 21 is large (even if L/y -17
- The surface to be polished of the lock L is the polishing surface 1 of the polishing plate 11 ]
It can be moved so as to correspond to 1111 a.

When the 07f polishing of the lens blank L is completed, move the tip 12 of the arm 12 in the direction F again, release the polished lens (blank) from the polishing plate 11, and remove the lens holder 1.
When the lens 9 moves to a predetermined position, air is sent to the air vent hole 1313, and the lens (blank) L is released from suction and removed from the holding hole 1.90.

In the above embroidery example, the air vent hole 13B of the needle holder main body 13 is connected to the vacuum bonder (not shown).
The air vent hole 1313 is provided at the tip of the swinging arm 12, and various types of lens holder 22 are replaced depending on the curvature of the lens blank L. Also,
The original shaft flange 15 and the original shaft 16 are configured to be connected with screws, but in order to heat-tighten the gasket 21, the cap 20 for fixing is divided vertically into two parts, and these are connected with small screws. As long as it is attached to the holder 19 by means of, for example, the original shaft flange 15 and the original shaft 16 may be formed integrally.

〔Effect of the invention〕

As described above, according to the present invention, the spherical portion at the tip of the original axis only changes the relative angular displacement of the lens holder? The lens holder is held in place, and the rotation of the lens holder is controlled by a ball bearing that supports the original shaft flange, so the rotation and relative angular displacement of the lens holder with the lens blank adsorbed is prevented. It is carried out very smoothly and corresponds well to the polishing surface of the polishing plate. Therefore, υF should be precisely concave. In addition, since the relative angular displacement between the lens holder and the original axis is small, it is easy to insert the Lens Blankke lens holder into the holding hole with a Rogue, etc., and there is no need to add a special angle correction device for that purpose. This has the advantage that the lens blank can be quickly and reliably sucked and held.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of R Dorai's vacuum suction type lens holding device.
FIG. 2 is a sectional view of one embodiment of the present invention, and FIG. 3 is a sectional view taken along the line-A in FIG. (Explanation of main parts No. η-) 11... Polishing plate, 12... Rocking arm, 1
3...Lens holder body, 14...Ball bearing, 15...Original shaft flange, J6
...Original axis, 18...Low M friction baggin,
19... Lens holding member, application filed Nippon Kogaku Co., Ltd. Agent Takashi Watanabe

Claims (1)

[Claims] In a lens grinding machine having a swinging arm for polishing that can swing around a polishing plate, the swinging arm is provided with a lens holder main body having a vacuum suction vent in the center. At the same time, a lens holding member having JI6 holes for vacuum suction is attached, and a ball shaft and a ball bearing are rotatably supported by the lens holder main body and have a male through hole at the center of the eye. A spherical shaft flange 7 is provided which is coupled to the lens holding member through a ball joint means consisting of a punch which tightly connects the joint, and a ball shaft flange 7 is provided between the ventilation hole of the lens holder main body and the ball flange. Low-friction packing installed (
The lens blank is sucked through the through hole of the ball joint means, and the spherical shaft flange is configured to rotate together with the lens blank in accordance with the rotation of the polishing plate. Lens holder for lens polisher.