JPH0248158A - Pressure device of sphere-core type spherical surface grinding machine - Google Patents

Abstract

PURPOSE:To stably generate the light pressure force by suspending the rear end of a pressure arm using the center of gravity to apply the pressure force to a pressure pin. CONSTITUTION:A pressure pin 15 is swung about a swing shaft 16 extending toward the center 14 of curvature of the work surface from one side of a work part 12 and presses the work part 12 to apply the pressure force to the work face of the part 12 with the end of the pin 15 constantly oriented toward the center of the center 14 of the curvature. A swing arm 17 is held on a bearing part 19 on a table 18 and has a shaft 20 extending coaxially with a swing shaft 16. A pressure arm 23 has the middle part thereof supported at the end part of the swing arm 17 and able to be turned by a turning pin 24, and has the front end part supporting the pressure pin 15. When this pressure device 10 is operated to generate a light pressure force, the pressure arm 23 is set for such weight distribution that the heavy load is applied to the rear end until the pressure pin 15 is lifted naturally and a weight 29 suspends the rear end of the pressure arm 23 until the desired pressure is generated at the pressure pin 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention primarily relates to a spherical polishing machine used for manufacturing lenses.
In particular, the present invention relates to a pressurizing device used in a spherical core type spherical polishing machine that always applies pressurizing force toward the center of curvature of a spherical processed surface.

BACKGROUND ART AND PRIOR ART PROBLEM TO BE SOLVED BY THE INVENTION A spherical core type spherical polishing machine is generally rotatably driven around a vertical axis, and has a machining section having a spherical machining surface, and a machine that rotates from the side of this machining section toward the center of curvature of the spherical machining surface. This configuration includes a pressure pin that swings around a swing axis extending from the center of the shaft and presses the processed portion toward the center of curvature.

Conventionally, the pressure device used in this polishing machine is rotatably attached to a swing arm that swings around a swing axis to support a pressure pin. An air cylinder or a spring is provided between the pressure arm and the force of the air cylinder or spring to apply pressure to the pressure pin.

In recent years, there has been a demand for microlenses with an aperture of 1+w or less, and polishing of such microlenses requires extremely low pressure from the pressure pin.

With the conventional pressure device mentioned above, even if it is used by applying counter pressure with a spring, it can only polish a lens with a diameter of 1.5 W11100, and the light pressure required to polish a lens with a smaller diameter is unstable. This makes it impractical.

Therefore, the present invention has been devised for the purpose of providing a pressurizing device that can stably generate a light pressurizing force and is capable of polishing a microlens with an aperture of 1 wax or less.

Means for Solving the Problems The present invention is provided in the above-mentioned spherical core type spherical polishing machine, and includes a swing arm that swings around a swing axis and extends upward from the processing section, and a swing arm that swings around a swing axis and extends upward from the processing section. A pressurizing arm whose intermediate portion is rotatably supported at the tip of the movable arm, and whose front end extends over the processing portion to support a pressurizing pin, and the pressurizing arm is coupled to the rear end of the pressurizing arm,
It extends upward and is guided by a guide provided on the swinging arm, then extends downward through a stationary guide located on the swinging shaft, and a weight is connected to the tip, lifting the rear end of the pressure arm. This is a pressurizing device for a spherical core type spherical surface polishing machine, which consists of a pressurizing pin and a string that applies pressurizing force.

Function: In this pressurizing device, the rear end of the pressurizing arm is pulled up by the gravity of the weight via the string, and pressurizing force is applied to the pressurizing pin at the tip of the pressurizing arm. For this reason, by setting the rear end of the pressurizing arm to be heavier than the front end in advance and making the weight of the weight slightly exceed this, it is possible to achieve arbitrary light pressurization. The cord is guided from the rear end of the pressure arm to the guide part of the swing arm, so it swings together with the swing arm. Because it passes through, the weight ahead is not affected by the rocking,
No vibrations or the like occur.

EXAMPLES Below, examples illustrating the present invention will be specifically described. The drawing shows the entirety of a spherical core type spherical surface polishing machine 11 using a pressurizing device 10 of the present invention.

Reference numeral 12 denotes a machining section, which is rotatably driven around a vertical axis 13, to which a lens, polisher, etc. are attached, and the machining surface is a spherical surface with a center of curvature of ]4.

15 is a pressure pin, which swings around a swing shaft 16 extending from the side of the processing section 12 toward the center of curvature 14 of the processing surface;
Pressing force is applied to the machined surface by pushing the machined part 12 while always pointing the tip toward the center of curvature 14.

Note that this processing section] 2. The configuration of the pressure pin 15 is a common one for a spherical core type spherical surface polishing machine.

17 is a swing arm, and a bearing body 19 on the table 18
It has a shaft body 20 which is supported by and extends coaxially with the swing shaft 6. This shaft body 20 is coupled to a motor 21 via a lever crank mechanism 22, so that the rotation of the motor 21 causes the swing arm 17 to swing around the swing shaft 16.

Reference numeral 23 designates a pressure arm, whose intermediate portion is rotatably supported by the tip of the swinging arm 17 by a rotation pin 24, and whose front end supports the pressure pin 15.

A string 25 is connected to the rear end of the pressure arm, extends upward from there, and extends downward via guide portions 26 and 27 consisting of pulleys attached to the swing arm ]7. Further, it is located on the swing shaft 16 of the swing arm 17, extends downward through a stationary guide part 28 formed by butting two pulleys, and has a weight 29 coupled to its tip.

When using this pressurizing device 10, if a light pressurizing force is to be obtained, set the weight distribution so that the pressurizing arm 23 is heavier at the rear end and the pressurizing pin 15 rises as it is, and the weight 29 is It is selected so that the rear end of the pressure arm 23 is lifted and a desired pressing force is generated on the pressure pin 15.

Effects of the Invention As mentioned above, the pressurizing device of the present invention uses the gravity of the weight to lift the rear end of the pressurizing arm and apply pressurizing force to the pressurizing pin, so that the weight of the pressurizing arm is reduced. By appropriately selecting the distribution and weight of the weight, the pressing force can be made extremely light, and since this pressing force is based on gravity, it is stable, and high-precision machining can be achieved. According to experiments, it is possible to polish microlenses with a diameter of 1 m+ or less.

Although this pressurizing device has the feature of realizing a light pressurizing force as described above, it is also possible to obtain a normal pressurizing force and can be used as is for normal lens processing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a spherical core type spherical polishing machine using an embodiment of the present invention. 10... Pressure device, 11... Ball core type spherical polishing machine, 12... Processing section, ]3...
...Vertical axis, 14... Center of curvature of machined surface,
15... Pressure pin, 16... Rocking shaft, 17... Rocking arm, 23...
Pressure arm, 25... String, 26.27.
...guidance section, 28... immovable guide section,
29... Weight.

Claims (1)

[Claims] 1. A processing section that is rotationally driven around a vertical axis and has a spherical processing surface, and a swing axis that extends from the side of this processing section toward the center of curvature of the spherical processing surface. A swinging arm that swings around a swing axis and extends upward from the processing section is installed in a spherical core type spherical polishing machine that has a pressure pin that moves and presses the processing section toward the center of curvature. A pressure arm whose middle part is rotatably supported by the tip of the swinging arm and whose front end extends above the processing part to support a pressure pin, and a pressure arm which is connected to the rear end of this pressure arm and extends upward to support the swinging arm. It is guided by a guide part provided on the movable arm, then extends downward through a stationary guide part located on the swing axis, and a weight is connected to the tip, lifting the rear end of the pressure arm and applying pressure to the pressure pin. A pressure device for a spherical core type spherical polishing machine consisting of a string that applies pressure.