JPS6085857A - Spherical center pressing type lens polishing machine - Google Patents

Abstract

PURPOSE:To make it possible to polish the surface of lenses having different radii of curvature with the use of one and the same polishing machine, by swinging a scale bar attached to a vertically adjustable holder, integrally with a swingable arm on an upper pan, around a vertically adjustable R center determining plug as a swining center. CONSTITUTION:In order to change the curvature of a surface to be polished, into 120R after polishing of the surface having 40R, a scale holder 8 is moved along a scale bar 10 after unfastening a securing screw, the securing mark of the holder 8 is aligned with 120R graduation, and then the scale holder 8 is secured. Since the positions of a tommy bar 5 and an upper pan 2 are shifted upward by a length corresponding to 80R, an R center displacing bracket 13, a bar 10 and holders 8, 6 are moved downward in order to compensate the positions of the tommy bar 5 and the pan 2. The height of the holder 6, having, as a center, the height of a tangential line to the curved surface of a polishing saucer, is dertermined, and the tommy bar 5 is lowered by means of pressing cylinder SL to make a lens 1 into press-contact with the polishing saucer 3. With this arrangement, the surfaces of lenses having different curvatures may be polished with one and the same polishing machine.

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, one of the lower plate and the upper plate is used as a lens polishing plate, and the upper plate is rotated along an arc by a swing arm with respect to the lower plate provided at the top of the spindle. The present invention relates to a pressurized lens polishing machine with a spherical core that is oscillated.

When polishing a lens, polishing with pressure in the same direction as the spherical center of the lens will distribute the force equally on the lens.
This method has the advantage that no unreasonable force is applied to the lens, so that the Newton's ring surface of the lens can be properly surfaced, and there is little change due to repeated machining.

However, conventional ball core pressure type lens polishing machines have a limit to the size of the ball core, that is, the range of lens curvature radius that can be polished.
For example, 0-5OR, IOR-5OR, 3OR-7OR
In this way, only a very small area could be processed. Therefore, for example, when polishing both sides of a lens where one side is 2OR and the other side is 6OR, or when polishing a 20R lens and a 6OR lens,
When polishing each lens of the OR, it was necessary to prepare two polishing machines with different polishable lens curvature radius ranges.

The purpose of the present invention is to significantly expand the limit of the radius of curvature of lenses that can be polished, and to make it possible to polish the front and back surfaces of lenses with different radii of curvature, or two or more types of lenses with different radii of curvature, using the same machine. be.

In order to achieve this objective, in the present invention, one of the lower plate and the upper plate is used as a lens polishing plate, and the kanzashi of the upper plate is moved along an arc by a swinging arm with respect to the lower plate provided at the top of the spindle. In the spherical core pressurized lens polishing machine, which is oscillated by
An R-core moving bracket is attached to the vertical column so that the vertical position can be adjusted, and the lower end of the scaler is rotatably connected to the bracket by an R-centering stopper, so that the scaler can be adjusted in the vertical position. Install the scale bar holder,
The swing arm is fixed to the scale bar holder so as to extend in the axial direction of the R centering stopper, and the swing arm is fixed to the scale bar holder.
A driving means is provided for reciprocating the R-centering plug together with the swinging arm around the R centering stopper.

1 and 2 for explaining one embodiment of the present invention, 1 is a lens, 2 is a case (upper plate) thereof, and 3 is a polishing plate. The polishing plate 3 is a polishing plate spindle 4
When the spindle 4 is rotationally driven by the continuously variable speed motor Ml provided in the housing, it rotates together with the spindle 4. The rotational drive mechanism of such a lens polishing plate is the same as the known one.

Next, the lens spherical core pressure holding mechanism will be explained.

In Figures 1 and 2, 5 is a lens holder center whose tip is swingably fitted into the center hole of the upper plate 2.
, 6 is its holder, and this holder 6 is the swing arm 7
It is attached to the tip of the A lens presser pressure cylinder SL for applying polishing pressure is provided on the upper part of the holder 6, and under the action of this pressure cylinder SL, the cap 5 presses the lens 1 onto the polishing plate 3.

In FIGS. 2 and 3, the swing arm 7 to which the holder 6 is attached extends rearward (to the right in FIG. 2) in an inverted shape, and has a shaft portion 7A at its lower end. This arm shaft portion 7A extends horizontally in the front-rear direction, and its tip is
The scale bar holder 8 is inserted into a hole in a scale bar holder 8 which is attached to the scale bar 10 so as to be vertically adjustable, and is fixed by a pin 9. In this embodiment, four parts are provided on one side of the scale bar holder 8 (the side opposite to the arm shaft part 7A), and a scale bar 1 with a scale S attached to the recessed part is provided.
The scale bar holder 8 is fixed at a predetermined position on the scaler 10 by a fixing screw 11 screwed into the scale bar holder 8 from the outside rear.

The lower end of the scaler 10 is connected to the R center by the R center determining plug 12.
It is rotatably attached to the core moving bracket (13).

This R-core movable bracket (13) is fitted onto a column 14 so as to be slidable up and down, and its height position with respect to the column 14 can be varied up and down by operating a moving handle 15.

Based on this configuration, the bar 5 and the holder 6 can reciprocate at a predetermined angle around the R centering plug 12, and the length of the arc of the bar 5 reciprocating is such that the scale bar holder 8 It is determined by the height position fixed relative to the par 10. Further, the height position of the upper plate 2 and the knife 5 with respect to the polishing plate 3 is determined by the vertical position at which the R core moving bracket 13 is fixed to the support column 14.

Reference numeral 16 denotes a bearing link mechanism that supports the arm shaft portion 7A in the middle, and includes a first link 18 whose rear end is pivotally connected to a bracket 17 fixed to the machine frame, and a rear end which is pivotally attached to the tip of this first link. and a second link 19. The tip of the second link 19 has a bearing portion 1 through which the arm shaft portion 7A rotatably passes.
It is configured as 9A. Therefore, the bearing link mechanism 16
When the swinging arm 7 makes a reciprocating swinging motion, the arm shaft portion 7A follows this motion and moves the arm shaft portion 7A without interfering with this motion.
support. .

Next, a mechanism for generating a swing motion of the pressure holding section will be explained.

A slot 20 is provided in the scale par 10 in the vertical direction from the upper end, and a rod 22 is inserted at an appropriate position in this slot.
One end is pivoted. In this embodiment, the slot 20 consists of a vertical groove with a T-shaped cross section provided in the scaler 10, and the head of the sliding bottle 21 is housed in this vertical groove and fixed in position, and is attached to the pin. One end of the rod 22 is rotatably attached. The other end of the rod 22 has a swing center shaft 23A in the center.
The intermediate lever 23 is pivotally connected to the upper end of the intermediate lever 23. A lever bracket 24 swingably supports the shaft 23A of the intermediate lever 23, and is fixed to the machine frame. Intermediate 8-
One end of a rod 25 is pivotally attached to the rear end of 23, and the other end of the rod 25 is pivotably attached to a crank B26 that is rotatably driven by a continuously variable speed motor M2.

In this embodiment, a groove 27 is provided in the crank disk 26 in the diametrical direction, and the other end of the rod 25 is pivotally attached to the groove 27 via a mounting means.

The crank disk 26 is rotated by the motor M2, and the intermediate lever -23 periodically reciprocates at a constant angle about the shaft 23A. As a result, the scaler 10 periodically reciprocates at a constant angle around the R centering plug 12 via the rod 22. The arm shaft portion 7A, and therefore the holder 6, is attached to the scale par IO through the scale bar holder 8, so the holder 6,
Kanzashi 5 and upper plate 2 are also located at point P (
It reciprocates around the R centering plug 12) at a predetermined swing angle θ, for example 500, and at a reciprocating rate of 5 to 90 times/min. This swing angle θ can be adjusted by changing the mounting position at which the other end of the rod 25 is fixed to the groove 27 of the crank disk 26.

By the above-mentioned left and right rocking of the upper plate 2 and rotation of the polishing die 3,
One side of the lens is polished to a clear, polished surface of the correct curvature, for example 4OR. Conventionally, it was impossible to polish the remaining one side of this lens or one side of another lens to 120R using the same machine, but with the polishing machine of the present invention, it can be done as follows. Can be done.

First, in order to change the curvature of the lens to the desired 120R, loosen the fixing screw 11, move the scale bar holder 8 along the scale par 10, and adjust the predetermined curvature of the fixed mark 9 attached to the scale bar holder 8. Adjust the scale to "120R" and tighten the fixing screw 11 again.

With this operation, Kanzashi 5 has 4OR with respect to base point P.
It is higher by the length of 8OR than when .

However, due to the above operation, Kanzashi 5 and "-Dish 2
The position of is shifted upward from lens 1 by a length of 80H. Then, in order to correct this positional deviation, the moving handle 15 is operated to lower the R centering plug 12. That is, by operating the moving handle 15, the R core moving bracket)
13. The scale bar 10, scale bar holder 8, and holder 6 connected thereto are moved downward as a whole. The height of the holder 6 centered on the height of the tangent to the curved surface of the polishing mold is determined, and the pressure cylinder SL is operated to lower the needle 5 to press the lens l and the polishing mold 3 together. Before and after these operations, the polishing die 3 on the top of the spindle 4 is made to have an appropriate approximate curvature. Further, if necessary, the pivoting position of the rod 22 relative to the scaler 10 is shifted downward, and the magnitude of the swing angle θ is made the same as the previous time.

Thus, the radius of curvature to be polished of the lens can be reduced from 4OR to 1
I was able to change it to 2OR.

In the above embodiment, the scaler 10 is driven by a link mechanism including the motor M2 and a crank, but it can also be driven manually or by other driving means. Furthermore, although a polishing machine in which the lower tray is a polishing type has been described, the present invention can also be applied to a polishing machine in which the upper tray is a polishing type.

As described above, in the lens polishing machine of the present invention, an R-center moving bracket is attached to the vertical column so that the vertical position can be adjusted, and the lower end of the scaler can be rotated on the bracket with an R-centering stopper. A scale bar holder is attached to the scale bar so that its vertical position can be adjusted.A swing arm is fixed to the scale bar holder by extending in the axial direction of the R centering stopper, and the scale bar is attached to the swing arm. with R
A driving means is provided for reciprocating the centering stopper. Therefore, by adjusting the fixed position of the holder relative to the scale bar to the desired radius of curvature, and correcting the resulting positional shift of the upper plate by adjusting the fixed position of the R-center moving bracket relative to the column, the curvature to be surface-polished is The radius can be changed significantly, so even lenses with greatly different radii of curvature on the front and back surfaces of the lens, or separate lenses with widely different radii of curvature, can be polished using only this machine.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of the front side of a lens polishing machine according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view thereof, and FIG.
The figure is a partial cross-sectional view of the side surface. l... Lens 2... Case (upper plate) 3... Lower plate 4... Spindle 5... Lens holding center (kanzashi) 7... Swinging arm 7A... Arm shaft portion 8 ...Scale bar holder 10...Scale bar 11...Fixing screw 12
...R core determining plug 13...R core moving bracket 14
...Strut 15...Moving handle 16...Bearing link mechanism 20...Slot 22...Rod 23...
...Intermediate lever 23A...Rotating center shaft 25...Rod 26...Crank board M1. M2...Motor
S...Scale Figure 1 Figure 2

Claims (1)

[Claims] In a spherical core pressurized lens polishing machine, either the lower plate or the upper plate is used as the lens polishing plate, and the upper plate is swung along an arc by a swing arm against the lower plate installed at the top of the spindle. Then, an R core moving bracket is attached to the vertical column so that the vertical position can be adjusted, and the lower end of the scaler is rotatably attached to the bracket with an R core determining plug, and the vertical position is adjustable on the scale bar. A scale bar holder is attached to the scale bar holder, and the swinging arm is fixed to the scale par holder by extending in the axial direction of the R centering stopper, and the scale bar is fixed to the scaler holder with the swinging arm centered around the R centering stopper. A spherical core pressurizing type lens polishing machine characterized by being provided with a drive means for reciprocating swinging.