JP2002346895A - Arm shaft mechanism of lens polishing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To process a lens accurately in a wide pressurized area, enabling fine adjustment of pressure. SOLUTION: The polishing machine has a lens holder 13 that holds a workpiece lens 14, an arm shaft 1 that has a lens holder 13 at its point and is capable of vertical motions, the first pressure means 3 and 4 that pressurize the arm shaft 1 when lenses are processed, a rotating drive means 8 that is coaxially provided above the arm shaft 1 to rotate the arm shaft, couplings 10, 11, and 6 that are provided between the rotating drive means 8 and the arm shaft 1 to transmit the torque of the rotating drive means 8 to the arm shaft 1 without restricting the vertical motion of the arm shaft 1, and the second pressurizing means 26 that pressurizes the arm shaft 1 by moving the rotating drive means 8 when lenses are processed. While a lens is processed, at least one of the first pressurizing means 3 and 4 and the second pressurizing means 26 pressurizes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper shaft mechanism of a lens polishing machine which holds and rotates a lens for polishing.

[0002]

2. Description of the Related Art As an upper shaft mechanism of a conventional lens polishing machine which holds and rotates a lens for polishing, there is an invention disclosed in JP-A-2000-94287.
FIG. 7 shows an upper shaft mechanism described in this publication.

In FIG. 7, an upper shaft 101 has a small diameter portion 101.
a and a large diameter portion 101b. This upper shaft 101
Is supported by a guide 102 attached to a housing 109 so as to be slidable in the vertical direction and rotatable about its central axis. A gap 103 is provided in an intermediate portion where the upper shaft 101 and the guide 102 slide,
Compressed air is fed into the gap 103 by a pneumatic device (not shown) from a vent 104 provided in the guide 102.

A spring 107 lifts the pin receiver 106 between the spring receiver 105 fixed to the upper end of the guide 102 and the pin receiver 106 of the joint 130 attached to the upper end of the upper shaft 101. When compressed air is sent from the ventilation port 104 to the gap 103, this portion serves as a pressurizing means, and the spring 107
In this structure, the upper shaft 101 is pressed down against the above force.

[0005] The joint 130 is provided above the upper shaft 101, and the housing 1 is coaxial with the upper shaft 101.
09 which is a rotation driving means attached to the motor 09
8 can be transmitted to the upper shaft 101.
The joint 130 includes a joint 110 connected to the rotation shaft of the motor 108, a pin 111 hanging downward from the joint 110, and the above-described pin receiver 106 attached to the pin 111.

[0006] The pin 111 consists of two pins,
10, the connection is established. The pin 111 is a pin receiver 106 below the joint 110.
And transmits the rotation of the motor 108 to the upper shaft 101. Further, there is an appropriate gap between the pin 111 and the hole 106a of the pin receiver 106, and the upper shaft 101 can freely move up and down.

A universal joint 112 is attached to the lower end of the upper shaft 101, and a lens holder 113 is detachably attached to the tip of the universal joint 112 with screws or the like. A lens 114 is attached to the lens holder 113.
As a result, the lens 114 comes into contact with the grindstone 115 during processing.
It can be adapted to the spherical shape. A grindstone 115 located below the lens 114 is fixed to an upper end of a spindle 116 rotated by a drive motor (not shown).

Further, the housing 109 includes an arm 117
The lens 114 is processed while performing a swinging operation about the arm shaft 118 of the arm 117.

In order to operate the upper shaft mechanism of the lens polishing machine having the above configuration, first, the lens holder 113 to which the lens 114 is attached is attached to the distal end of the universal joint 112 at the lower end of the upper shaft 101. Next, vent 1
04, compressed air is sent into the air gap 103 by the pneumatic device, and the upper shaft 101 is pushed down, and the lens 114
Is brought into contact with the grindstone 115. At this time, the lens 114 is pressed downward by a predetermined pressure.

Then, the spindle 1 is driven by the drive motor.
The grindstone 115 fixed to 16 is rotated. At the same time, the motor 108 is rotated to
Is transmitted to the upper shaft 101 via the joint portion 130, and the rotation of the upper shaft 101 causes the lens 114 attached to the lens holder 113 to rotate on the grindstone 115 for processing.

[0011]

However, in the conventional structure described above, air does not reach the center of the upper shaft 101 to be pressurized (corresponding to the cross-sectional area of the small diameter portion 101a of the upper shaft 101). The part cannot be used for pressurization.
For this reason, it is difficult to press the lens 114 with a large force. On the other hand, in order to increase the area receiving the air pressure, it is necessary to increase the diameter of the large-diameter portion 101b of the upper shaft.
08 is also large. Further, when the area receiving the air pressure is increased, the pressing force greatly changes even with a small change in the air pressure. For this reason, there is a problem that it is difficult to finely adjust the pressure, which has been possible until then.

From the above, the upper shaft mechanism of the lens polishing machine as described above is only applied to a field where the pressing force is small or a field where the pressing force is large but fine pressure adjustment is not necessary. I have. In addition, since the pressing range is narrow, it is necessary to separately manufacture individual upper shafts corresponding to the pressing range.

The present invention has been made in view of the above-mentioned conventional problems. In an upper shaft mechanism of a lens polishing machine which holds and rotates a lens for polishing, an adjustment range of a pressing force is provided. It is an object of the present invention to provide an upper shaft mechanism that is wide and can finely adjust the pressing force.

[0014]

In order to solve the above-mentioned problems, an upper shaft mechanism of the lens polishing machine according to the first aspect of the present invention comprises:
A lens holder for holding the lens to be processed, an upper shaft having the lens holder at the tip and movable vertically, a first pressing unit for pressing the upper shaft during lens processing; A rotation driving means provided coaxially above the upper shaft to rotate the upper shaft, and a rotation driving means provided between the rotation driving means and the upper shaft to rotate the upper shaft without restricting the vertical movement thereof. A joint for transmitting the rotational force of the means to the upper shaft,
A second pressing means for moving the rotation driving means to press the upper shaft during lens processing, and
And pressurizing by at least one of the second pressurizing means and the second pressurizing means.

According to the present invention, since two pressing means are provided for pressing the upper shaft during lens processing, the two pressing means can be used in combination in accordance with processing conditions. More appropriate pressurization conditions can be set.

According to a second aspect of the present invention, there is provided the upper shaft mechanism of the lens polishing machine according to the first aspect, wherein the adjustment range of the pressing force of the second pressing means is set by the pressing force of the first pressing means. It is characterized by being wider than the pressure adjustment range.

According to the present invention, the pressure adjusting means is not suitable for the fine adjustment of the pressing force while the adjusting range of the pressing force is wide, and the pressurizing means which is suitable for the fine adjustment of the pressing force is narrow. It can be used in combination with the means. For this reason,
The adjustment range of the pressing force is wide, and fine adjustment of the pressing force is also possible.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments shown in the drawings. In each of the embodiments, the same members are assigned the same reference numerals to correspond to each other.

(Embodiment 1) FIGS. 1 to 4 show Embodiment 1 of the present invention. FIGS. 1 and 4 are front views, FIG. 2 is a side view, and FIG. 3 is an exploded perspective view.

The upper shaft 1 is formed by connecting an upper small-diameter portion 1a and a lower large-diameter portion 1b in series. The upper shaft 1 is inserted into a housing 2 and is slidable up and down with respect to the housing 2 and supported so as to be rotatable about its axis. An air gap 3 is provided in an intermediate portion where the upper shaft 1 and the housing 2 slide.
The compressed air is sent into the air gap 3 from a vent 4 provided in the air gap by a pneumatic device (not shown).
The compressed air sent into the gap 3 acts as a first pressurizing unit that presses the upper shaft 1 toward the lens 14 against a biasing force of a spring 7 described later.

A housing hole 2b is formed in an upper portion of the housing 2 into which the upper shaft 1 is inserted, and a spring 7 is disposed in the housing hole 2b. The spring 7 is disposed on the outer periphery of the small diameter portion 1a of the upper shaft 1 protruding from the housing hole 2b, and is sandwiched between the housing 2 and the pin receiver 6. The upper shaft 1 and the pin receiver 6 are
And a female screw provided in the axial direction of the center of the pin receiver 6. On the surface (upper surface) of the pin receiver 6 on the side opposite to the side where the upper shaft 1 is screwed, a hemispherical spherical portion 6b is formed integrally with the center of the spherical member 6b so as to coincide with the center of the pin receiver 6. ing.

A motor 8 serving as a rotation driving means for rotating the upper shaft 1 is fixed to a motor bracket 21. The motor shaft 8a is inserted into a joint hole 10c of the joint 10, and is connected to the joint 10 by a screw (not shown). The pin 11 is pressed into a joint pin hole 10 a of the joint 10 and fixed. On the surface (lower surface) on the pin receiver 6 side of the joint 10, a hemispherical spherical portion 10 b centered on the rotation axis of the joint 10 is provided.
Are formed, and face the ball portion 6b of the pin receiver 6.

The motor bracket 21 is fixed to a later-described cylinder receiver 22 by screws (not shown), and the cylinder receiver 22 is fixed to a guide portion 23. The guide portion 23 is vertically movable along a rail portion 27 fitted with the guide portion 23. The rail portion 27 is fixed to the base plate 25 by screws (not shown).

The pin 11 forms a joint by being inserted into the pin receiving hole 6a of the pin receiver 6. There is an appropriate gap between the pin receiving hole 6a and the pin 11,
Can move up and down with respect to the pin receiving hole 6a.

The housing 2 is mounted on the base plate 25 so that the rotating shaft 8a of the motor 8 and the rotating shaft of the upper shaft 1 are coaxial.
Fixed to A universal joint 12 is attached to the tip (lower end) of the upper shaft 1, and a lens holder 13 is detachably attached to the tip with a screw or the like, and a lens 14 is attached to the lens holder 13.

Below the lens 14, a grindstone 15 fixed to the upper end of a spindle 16 rotated by a motor (not shown) is disposed. The lens 14 can freely adjust to the spherical shape of the grindstone 15 during processing. ing.

In addition to the above, in this embodiment, the second
Is provided with a pressure cylinder 26 as a pressure means. The pressure cylinder 26 is supported by a cylinder bracket 24 attached to a base plate 25, as shown in FIGS. The pressurizing cylinder 26 receives compressed air from a compressed air supply device (not shown), so that the cylinder shaft 26a can move in the axial direction. The above-described cylinder receiver 22 is fixed to the cylinder shaft 26a.

In this embodiment, as shown in FIG.
By rotating the motor shaft 8a, the joint 1
0 rotates, and the pin 11 rotates integrally. Since the pin 11 is inserted into the pin receiving hole 6a, the rotation of the pin 11 causes the pin receiver 6 to rotate, thereby rotating the upper shaft 1.

By sending compressed air from a compressed air supply device (not shown) into the gap 3 through the ventilation port 4,
Of the large diameter portion 1b is pressed. As a result, the upper shaft 1 is pressed downward while rotating, and thus acts as a first pressing unit. When the feeding of the compressed air is stopped, the upper shaft 1 is rotated by the urging force of the spring 7 to return to the state before pressurization.

As shown in FIGS. 2 and 4, compressed air is supplied from a compressed air supply device (not shown) to a pressurizing cylinder 26 as a second pressurizing means, so that a cylinder receiver 2 is provided.
2 moves downward along the rail portion 27 together with the guide portion 23. The motor bracket 21, the motor 8, the joint 10, and the pin 11 also descend with the cylinder receiver 22 descending. Therefore, the motor shaft 8a, the joint 10, and the pin 11 descend while rotating. Due to this lowering, the ball portion 10b of the joint 10 comes into contact with the ball portion 6b of the pin receiver 6 (see FIG. 1). After that, these spheres 10b, 6
The pressing force of the pressure cylinder 26 is transmitted to the upper shaft 1 via the contact b, and presses the lens 14. Since the spindle 16 is disposed below the lens 14, the lens 14 is processed by the grindstone 15 attached to the rotating shaft.

When the pressing force to the lens 14 is set, the compressed air is sent only to the vent 4, the compressed air is sent only to the pressurizing cylinder 26, or the vent 4 and the pressurizing cylinder 26 It is possible by sending compressed air to both of them, and these options are free.

In the above configuration, the pressure applied from the ventilation port 4 as the first pressurizing means has a narrow adjustment range, but can be finely adjusted, and the pressurizing cylinder 26 as the second pressurizing means.
Is difficult to fine-tune, but the adjustment range of the pressing force is wide. In this embodiment, since such two pressurizing means are combined, the adjustment range of the upper shaft is widened, and pressurization that can be finely adjusted can be performed. For example, 0 to 0.01 by compressed air sent from the vent 4
The pressure is adjusted in units of 0.001 MPa up to MPa, and the pressure is adjusted in units of 0.01 MPa from 0.01 MPa to 0.3 MPa by the pressure cylinder 26, and by using these together, from 0 to 0.3 MPa 0.001MP
The pressure can be adjusted in units of a.

As a result, it is not necessary to separately manufacture the upper shaft depending on the magnitude of the pressing force as in the prior art, and the space efficiency of the equipment can be significantly improved. Also,
Even when the pressing force is large, the accuracy of pressing is improved, so that the processing accuracy of the lens is improved.

(Embodiment 2) FIGS. 5 and 6 show Embodiment 2 of the present invention. In this embodiment, the magnets 32a and 32b are arranged so as to face each other. Magnet 3
2a is bonded to the magnet joint 31, and the magnet 32b is bonded to the magnet pin receiver 33. The magnet joint 31 has a pin hole 31a into which the pin 11 is press-fitted. The magnet pin receiver 33 has a pin receiving hole 33a into which the pin 11 is inserted.
An appropriate gap is formed between the pin and the pin 11.
Therefore, the magnet joint 31 corresponds to the joint 10 of the first embodiment, and the magnet pin receiver 33 corresponds to the pin receiver 6 of the first embodiment. Further, the magnet 32a and the magnet 32b
These poles are arranged so that a repulsive force acts between them.

Also in this embodiment, as shown in FIG. 2, by sending compressed air from a compressed air supply device (not shown) to a pressurizing cylinder 26 as a second pressurizing means, a cylinder receiver 22 is provided. Moves downward along the rail portion 27 together with the guide portion 23. Thereby, the magnet joint 31 descends as shown in FIG. 5, and the magnet 32a and the magnet 32b approach. As a result, the magnet 32a and the magnet 3
The pressing force of the pressurizing cylinder 26 is transmitted to the upper shaft 1 via the repulsive force 2b.

Therefore, in this embodiment, the same effect as that of the first embodiment can be obtained, and in addition, the pressure cylinder 26
Can be transmitted to the upper shaft 1 in a non-contact manner, so that the vibration of the rotary drive means is not transmitted to the upper shaft. As a result, it is possible to perform processing with higher surface accuracy.

[0037]

As described above, according to the first aspect of the present invention, since there are provided two pressing means for pressing the upper shaft at the time of lens processing, the processing conditions can be reduced. In addition, two pressurizing means can be used in combination, so that appropriate pressurizing conditions can be set. In addition, fine adjustment of pressurization by one upper shaft is possible, and the pressurizing force can be adjusted in a wide range. Therefore, there is no need to prepare a large number of upper shafts according to the pressurizing range. Efficiency can be improved.

According to the second aspect of the present invention, in addition to having the effects of the first aspect of the present invention, the range of adjusting the pressing force is wide,
In addition, the pressure can be finely adjusted, and the pressure accuracy is improved even when the pressure is large, so that the lens processing accuracy is improved.

[Brief description of the drawings]

FIG. 1 is a front view at the time of operating a second pressurizing unit according to the first embodiment of the present invention.

FIG. 2 is a side view of the first embodiment.

FIG. 3 is an exploded perspective view of the first embodiment.

FIG. 4 is a front view of the first embodiment.

FIG. 5 is a front view of the second embodiment.

FIG. 6 is an exploded perspective view of a joint according to the second embodiment.

FIG. 7 is a front view of the prior art.

[Description of Signs] 1 Upper shaft 2 Housing 3 Air gap 4 Vent 6 Pin receiver 7 Spring 8 Motor 10 Joint 11 Pin 26 Pressurizing cylinder 31 Magnet joint 32a Magnet 32b Magnet 33 Magnet pin receiver

Claims (2)

[Claims] 1. A lens holder for holding a lens to be processed, an upper shaft having the lens holder at its tip and movable vertically, and a first for applying pressure to the upper shaft during lens processing. Pressurizing means, rotational drive means provided coaxially above the upper shaft to rotate the upper shaft, and a rotational drive means provided between the rotational drive means and the upper shaft to restrict the vertical movement of the upper shaft. A joint for transmitting the rotational force of the rotary driving means to the upper shaft without performing, and a second pressing means for moving the rotary driving means to press the upper shaft during lens processing. The upper shaft mechanism of the lens polishing machine, wherein the pressing is performed by at least one of the first pressing unit and the second pressing unit. 2. The lens polishing machine according to claim 1, wherein the adjustment range of the pressing force of the second pressing unit is wider than the adjustment range of the pressing force of the first pressing unit. Shaft mechanism.