JPS637907B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 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 and small radii of curvature with one machine.

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, and to satisfy this condition, special tools were used for convex lenses and concave lenses. I had no choice but to polish it with a polishing machine. In other words, the swinging fulcrum of the polishing plate when polishing a convex lens and the swinging fulcrum of the polishing plate when polishing a concave lens are at positions that are far apart in vertically opposite directions in the axial direction around the mounting axis of the lens attachment plate. Therefore, if one polishing machine were to be used for both purposes, the entire polishing section, in which the polishing plate and lens are set in pressure contact, would have to be moved up and down, resulting in an extremely complex structure and high cost. In addition, there was a drawback that the accuracy decreased 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 swinging fulcrum of the polishing plate must be changed by a wide range during polishing, and as a result, due to the structure, the pressure applied to the lens by the polishing plate is not uniform, making it difficult to approximate the radius of curvature. The drawback was that it was not possible to polish lenses with high precision.

The present invention improves these conventional drawbacks and has a structure that allows polishing of lenses for concave and convex surfaces and polishing with a wide range of radius of curvature to be achieved with a single polishing machine.
The purpose of the present invention is to provide a polishing machine that can be easily switched and that can polish lenses with high precision by constantly applying uniform pressure to the polishing plate against the lens surface.

The structure of the present invention will be explained in detail with reference to an embodiment shown in the drawings. 1 is a machine base, and 2 is a lens polishing plate for polishing a lens L. The machine base 1 is rotatably driven by a drive motor 3. Ru. 4 is lens L
is attached to the lower end of the hairpin 7 fixed to the hairpin attachment part 7' at the tip of the support arm 6 that is slidably fitted on the holder 5, and
An air cylinder 8 is installed between the lens attachment plate 4 and the holder 5, so that the lens sticking plate 4 is brought into pressure contact with the lens polishing plate 2, and both constitute a polishing section A. Reference numeral 9 denotes a fulcrum moving body which can be moved up and down with respect to the holder 5 and which is attached to the machine frame 1 erected on the machine base 1.
A screw hole 11 is provided in the protruding body 9a on the upper part of the fulcrum moving body 9 to screw into the screw rod 13 which is connected to and hangs down from 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 rotating the handle 12. Reference numeral 14 denotes a fulcrum shaft, which is pivotally connected to the fulcrum moving body 9. A first pinion 15 and a second pinion 16 are attached to both ends of the fulcrum shaft, respectively. meshes with 17,
A second pinion 16 at the other end meshes with a rack 18 attached to the holder 5. Reference numeral 19 denotes a swing drive body, which is attached to the upper end of the fulcrum moving body 9, and whose rotating shaft 20 is a telescopic transmission having a universal joint on the drive shaft of a drive motor 21 installed on the machine frame 1a. One end of a swinging rod 24 is rotatably connected via a shaft 22 and attached to an eccentric cam 23 provided on the rotating shaft 20 so that the amount of eccentricity can be adjusted, and the other end is connected to the holder 5 vertically. It is movably fitted and pivoted to one side of a rocking body 25 which is rotatably fitted to the fulcrum shaft 14.

With this structure, in order to polish a convex lens with a large radius of curvature S, when the handle 12 is turned to rotate the screw rod 13, the fulcrum moving body 9 that is screwed therewith will move along the rail 10. move upwards. As this movement occurs, the first pinion 15 at one end of the fulcrum shaft 14, which is pivotally connected to the fulcrum moving body 9, rotates and rises while engaging the fixed rack 17, so that the second pinion 16 at the other end of the fulcrum shaft 14 also does the same. The fulcrum moving body 9 slides relative to the holder 5 and moves upward while engaging with the rack 18 provided on the holder 5. Thereby, the height of the center of the fulcrum shaft 14 can be set at the position of the radius of curvature S with respect to the polishing reference line XX passing through the lens surface on the upper surface of the lens polishing plate 2. When the drive motors 3 and 21 are started in this state, one of the drive motors 3 rotates the lens polishing plate 2, and the other drive motor 21 is connected to the rotation shaft 2 through the transmission shaft 22.
0 and causes the swinging rod 24 to reciprocate up and down by the eccentric cam 23, so that the swinging body 25 pivotally attached to the lower end of the swinging rod 24 reciprocates around the fulcrum shaft 14. Since the holding body 5 is fitted to this rocking body 25, the rack 18 of the holding body 5 rotates around the second pinion 16, reciprocatingly rotates the holding body 5, and the rack 18 of the holding body 5 is attached to the tip thereof. The lens attaching plate 4 rotates back and forth in an arc a around the focal point of the convex lens to be polished and a fulcrum shaft 14 having a radius of curvature S via the supporting arm 6.
The lens L pressed onto the lens L can be polished to a predetermined curvature. When polishing a concave lens, the distance corresponding to the radius of curvature S' is set between the polishing reference line X-X passing through the lens surface on the lower surface of the lens attachment plate 4 and the fulcrum axis
Just set it to the distance between the center and the center. To do this, rotate the handle 12 in the opposite direction to the above to lower the fulcrum moving body 9. As a result, the first pinion 15 of the fulcrum shaft 14 engages and rotates with the fixed rack 17 and descends, and the second pinion 15 integrated therewith
6 also engages and rotates with the rack 18 and lowers, so that the fulcrum shaft 14 can be set at a predetermined position below the lens polishing plate 2. When the lens sticking plate 4 is rotated back and forth by the swinging rod 24, the lens sticking plate 4 is moved to a fulcrum shaft 1 whose axis is the focal position of the concave lens to be polished and which has a radius of curvature S'.
The lens L attached to the lens attachment plate 4 can be polished to a predetermined curvature by rotating back and forth while drawing an arc b with 4 as a fulcrum.

In the above embodiment, the holder 5 connects the lens attachment plate 4 of the polishing section A, but it may also connect the lens polishing plate 2 as in the conventional example.

As described above, the present invention is capable of polishing concave or convex lenses from lenses with a large radius of curvature to lenses with a small radius of curvature with a single polishing machine and without the need for any special attachments. The fulcrum shaft can be easily set to the desired position by vertically moving the pinion that is meshed with both racks, and the lens polishing plate is always pushed at right angles to the lens polishing surface, that is, toward the focal point of the lens. Since it polishes by reciprocating in an arc shape around the pressure and focus, it is possible to polish various lenses with high precision without causing unevenness. Furthermore, 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 install an autoloading device that automatically supplies lenses. It has excellent effects such as:

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of the present invention, FIG. 2 is a cross-sectional plan view of the main part, FIG. 3 is a perspective view of the main part, and FIG. 4 is an explanatory diagram of the polishing trajectory. 1... Machine stand, 2... Lens polishing plate, 3... Drive motor, 4... Lens sticking plate, 5... Holder,
6... Support arm, 7... Hairpin, 9... Fulcrum moving body, 10... Rail, 12... Handle, 13...
...screw rod, 14... fulcrum shaft, 15... first pinion, 16... second pinion, 17... fixed rack, 18... rack, 19... rocking drive body, 20
... Rotating shaft, 21 ... Drive motor, 23 ... Eccentric cam, 24 ... Rocking rod, 25 ... Rocking body, A ...
...Polishing department.

Claims (1)

[Claims] 1. A holder is connected to either the lens polishing plate or the lens sticking plate of the polishing section installed on the machine base, and the holder is slidable on the oscillating body fitted to the fulcrum moving body so as to be rotatable back and forth. A pinion is attached to each end of the fulcrum shaft which is fitted into the oscillator and pivoted to the fitting center of the oscillator, one pinion is engaged with a fixing rack fixed to the machine frame, and the other pinion is attached to the holder. The fulcrum shaft can be adjusted to a set position in the vertical direction with respect to the polishing reference line of the polishing section by means of a pinion that meshes with the rack and rotates on the rack as the fulcrum moving body moves in the vertical direction. A lens polishing machine characterized in that a convex lens or a concave lens is polished by swinging a holder about the fulcrum shaft.