JPH044094B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lens grinding machine, and more particularly to automatic adjustment of the amount of polishing in a spherical lens polishing device.

[Conventional technology]

Currently used lens polishing devices can be broadly classified into whether the direction of polishing pressure is always applied toward the spherical center of the polishing plate or toward the spherical center. The present invention belongs to the former category, and is an apparatus for polishing a lens by swinging the polishing plate around its spherical core. Further, there are two types of this device: one in which the polishing plate is swung around the spherical core, and the other in which the holder shaft is swung toward the spherical core. The latter method has been commonly used in the past, and since the lens is always unbalancedly pressurized, not only does the reproducibility of the lens R deteriorate, but the polishing plate wears out very quickly, so it must be done frequently. It is necessary to readjust the dish R and readjust the swing angle and width. Furthermore, although the latter poses relatively few problems in the case of concave lenses, many problems have arisen when polishing convex lenses.

Therefore, based on the results of many years of research by the applicant, we have developed a solution to the above-mentioned drawbacks and problems, and have previously filed a patent application (Japanese Patent Application No. 74289/1989).
did. That is, the invention according to this application has a drive shaft with a spindle installed in the center of the box of a cylinder, a polishing plate having a spherical recess at the tip of the drive shaft, and a V-pulley at the other end. A polishing plate rotating/oscillating mechanism A is mounted to rotate the polishing plate via a motor, and a center shaft is attached above the box to swing the entire box in a pendulum shape via a bearing, and An abrasive holder fixing and pressurizing mechanism B is provided, in which a holder shaft with an abrasive holder connected thereto is fixed to the upper part, and a holder arm with a spring for pressurizing is attached to the holder shaft. By placing the lens L under pressure and rotating and rocking the polishing plate for polishing, the lens is always pressed from the direction of the spherical center against the polishing plate at any angle, and furthermore, the applied force is always constant. Therefore, the present invention provides a lens polishing device that can perform polishing in a stable state at all times and is capable of obtaining accurate and high-quality polished lenses.

[Problem to be solved by the invention]

The problem to be solved by the present invention is to enable automatic adjustment of the amount of lens polishing in such a conventionally known lens polishing device. That is, the amount of polishing is measured and set in advance so that the amount of lens polishing (the amount of wall thickness) can be automatically controlled while the main body of the apparatus is in operation.

[Means to solve the problem]

The present invention was developed in order to solve the above-mentioned problems, and it rotates a polishing plate connected to a driving spindle and shakes a lens polishing box in which the spindle is installed. It is composed of a polishing plate rocking mechanism that moves the polishing plate, and a polishing holder pressing mechanism that presses the lens by pressing the polishing holder from the vertical direction of the polishing plate.
For lens polishing equipment that polishes by swinging a polishing plate at a position offset from the center position, it is equipped with a measurement terminal that automatically measures the amount of lens polishing and an adjustment knob that sets the measurement amount. A dial gauge is provided, and the dial gauge is attached to a holder arm into which a vertically movable holder shaft is inserted, and the holder shaft is locked to the holder arm via a spring to press the abrasive holder, and furthermore, A detection plate is provided with an adjustment bolt that operates the measurement terminal of the dial gauge to adjust the amount of polishing of the lens, and the detection plate is attached to the upper part of the holder shaft, and the adjustment bolt and measurement terminal are in contact with each other. The present invention provides an automatic polishing measuring device in a lens polishing mechanism, which is a polishing holder pressurizing mechanism that polishes a lens polishing amount according to a measurement value set on the dial gauge when operated.

[Effect]

If you set the measured value of lens polishing amount (wall thickness amount) by operating the adjustment knob on the dial gauge,
Since the holder shaft is constantly pressurized and compressed, the lens (workpiece) on the polishing plate is being polished through the polishing holder while the lens (workpiece) is being polished at a constant measurement value, that is, a constant amount that is set in advance through the adjustment knob of the dial gauge. When the holder shaft has been polished to a certain value, the pressurization of the holder shaft will be automatically stopped. This is because the tip of the measurement terminal of the dial gauge is constantly pressed by the adjustment bolt of the detection plate fixed to the upper part of the holder shaft, so it is not polished until it reaches the measured value (scale) of the dial gauge. This is because the polishing plate is automatically stopped when the polishing plate is turned off.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a conventional lens polishing apparatus, which can be roughly divided into a polishing plate rotating and swinging mechanism A and a polishing holder fixing and pressing mechanism B. The polishing plate rotation and oscillation mechanism A was developed by the applicant, and has a drive shaft 2 with a spindle 3 installed in the center of the cylindrical box via bearings 15, 15. A polishing plate 1 for polishing the lens L having a spherical indentation is screwed onto the upper end of the lens 2, and a V pulley 4 is attached to the other lower end, and is driven via a V pulley 5 and a belt 7. It is configured to The V-pulley 5 is attached to a drive shaft 6 that is linked to a spindle motor 9, and the polishing plate 1 can be freely rotated by driving the spindle motor 9. Further, a bearing 15 is provided in the upper part of the sleeve 11.
A center shaft 12 is attached via a center shaft 15, and the entire cylindrical box in which the polishing plate rotating and swinging mechanism A is installed is moved via a swing post 16 and a swing cylinder 17 which are linked to a spindle motor 9. It is configured to swing like a pendulum. That is, the polishing plate rotation and oscillation mechanism A
is characterized in that the rotation of the polishing plate and the swinging of the box are automated. 8 is a sleeve, 10 is a sleeve base, 13 is a bearing case, 14
is the frame base, 18 is the cylinder foot, 1
9 is a frame.

Next is the abrasive holder fixing and pressing mechanism B.
This mechanism is also conventionally known, and a polishing holder 24 is attached to the tip of a holder shaft 20 attached to a holder arm 21 via a metal 22. The holder arm 21 is elastically attached to the upper end of the holder shaft via a pressurizing spring 23, and the holder shaft 20 is constantly pressurized. By applying this pressure, the polishing holder 24 is configured to constantly press the lens L on the polishing plate 1. That is, the polishing holder fixing and pressing mechanism B fixes the polishing holder 24 and always presses one part of the polishing plate from a fixed direction (vertical direction).
The polishing lens L is constantly pressurized against the spherical core.
This is a mechanism for pressing the polishing plate 1 and the polishing holder 24 between the polishing plate 1 and the polishing holder 24. Note that 25 is an abrasive drain pit.

FIG. 2 shows a state in which the automatic polish measuring device of the present invention is attached to the conventionally known polishing apparatus shown in FIG.

In the present invention, an automatic polishing measuring device is attached to the polishing holder fixing and pressing mechanism B of a conventional polishing device, and D is a dial gauge thereof. This dial gauge D is configured to be electrically driven via a lead wire 31 for signal extraction, and operated by a measurement terminal 33 attached to the upper part. That is, when the measuring terminal 33 is pressed, an electrical contact within the dial gauge D is activated to issue a stop signal. Reference numeral 32 is an adjustment knob for electrical contacts, and is an adjustment knob for predetermining a polishing measurement value. That is, by adjusting the adjustment knob 32, the abrasive measuring device is adjusted to the dial gauge D.
If you set it according to the scale, the measuring terminal 33
The needle moves to the adjusted scale by pressing the button, and a stop signal is issued. 34 is an adjustment bolt, which is connected to the measurement terminal 3 via the detection plate 35.
It is fixed to the upper part of the tip of No.3. The adjustment bolt 34 is used to position the polishing measurement value by adjusting the length of contact with the measurement terminal 33, and the detection plate 35 is connected to the holder shaft 20 for operating the adjustment bolt 34. This is a single plate for interlocking with. That is, the adjustment bolt 34 is moved up and down by the up and down movement of the holder shaft 20, and by the up and down movement of the adjustment bolt 34, the tip of the measurement terminal 33 can be further pressed. 36 is a mounting plate for the dial gauge D, which is mounted between the measurement terminal 33 and the holder arm 21. This mounting plate 36 is used to fix the dial gauge D to the holder arm 21, and by this fixing, the detection plate 35 fixed to the holder shaft 20 can be moved up and down.

FIG. 3 is an enlarged view of the polishing holder fixing and pressing mechanism B of the apparatus of the present invention. The automatic polish measuring device of the present invention will be explained in detail below with reference to FIG.

First, place the polishing lens (work) L on the polishing plate 1.
, and lightly place the polishing holder 24 on top of it.
On the other hand, the polishing measurement value of the lens L to be polished is determined and the adjustment knob 32 is set. Next, the present device is operated to activate the polishing plate rotating and swinging mechanism A and the polishing holder fixing and pressing mechanism B. Then, as the polishing plate 1 rotates, the entire box swings, and the polishing holder 24 is pressurized via the holder shaft 20, causing the polishing plate 1 and the polishing holder 24 to be pressurized.
The lens L in between will be polished automatically.
When the polishing is completed to the scale of the dial gauge D where the measured value has been set in advance, the needle S moves to the desired scale, so the polishing plate 1 automatically stops and the holder shaft The pressurization of 20 is also stopped at the same time. That is, when the lens L is polished by the width M, the adjustment bolt 34 is moved downward by the width M and presses the measurement terminal 33 by the width M. As a result, the measured value can be polished by M width amount.

Next, the structure of the dial gauge D used in the device of the present invention will be explained in detail with reference to Figures B and C.
As this dial gauge D, a commonly available one is used. As shown in FIG. 2, the adjustment bolt 34 is connected to a lock nut 38 and further connected to a measuring terminal 33.

On the other hand, as the dial gauge D, a known dial indicator 30 (trade name: Trimetron) is used. As shown in Figure C, the internal structure of the dial indicator 30 is such that an electrical contact is attached to the lever of the microindicator, and when the spindle moves up and down, the microindicator operates, and the electrical contact moves accordingly and comes into contact with a fixed contact. It functions as a switch by moving back and forth. Therefore, if this is incorporated into an electric circuit, the electric circuit can be opened and closed to operate the electric equipment on the circuit.

Furthermore, a method of setting the sizing device using this dial gauge D will be explained. First, a standard thickness lens is set in the polishing holder 24. Next, the holder arm 21 is lowered, and the lens L is pressed onto the polishing plate 1 by the pressurizing spring 23 via the polishing holder 24 and holder shaft 20, and the state immediately before starting normal polishing work (as shown in Fig. 3A) is achieved. situation)
Set to . Therefore, the dial indicator 30
While pressing down the measurement terminal 33 with your fingertip, turn the limit setting knob 32 to align the pointer with the desired scale position. Next, the measuring terminal 33 of the dial indicator 30 is moved up and down using the adjusting bolt 34, and the adjusting bolt 34 is locked so that the pointer indicates the same position as the desired scale position. Further, if the standard thickness lens in the polishing holder 24 is replaced with the lens L to be processed and the polishing apparatus is started, the lens L to be processed in the polishing holder 24 is polished. At that time, for example, the processed lens L has a thickness M
When m/m is ground, the holder shaft 20 also becomes M.
Since it descends by m/m, the measurement terminal 33 of the dial indicator 30 is also pushed down at the same time. As a result, when the pointer reaches a desired scale setting position, the contacts inside the dial indicator 30 open and close, and the polishing device is stopped by an electric signal from the lead wire 31.

In this way, once the polishing machine has stopped,
The lens is taken out using the polishing holder 24 and its thickness is measured. Note that if the measured value is outside the target thickness, the target value is corrected by turning the adjustment bolt 34. Note that when the adjusting bolt 34 is turned clockwise when viewed from above, the lens thickness becomes thicker, and when turned counterclockwise, the lens thickness becomes thinner.

FIG. 4 is an enlarged view of the structural part of the polishing holder. As shown in Figure A, a locking ball 20a is attached to the tip of the holder shaft 20, and this locking ball 20a
4 is screwed to the top end. That is, the upper end of the polishing holder 24 is formed into a V-shape, and the locking ball 20a of the holder shaft 20 is inserted into this V-shaped groove and attached with a screw 37. Note that the locking ball 20a is attached to hold the holder shaft 20 so that its central position does not change.

On the other hand, the lower end of the polishing holder 24 is attached to the polishing plate 1.
The lens L is in direct contact with the lens L by the polishing holder 24 in order to apply pressure directly to the lens L above.

In this way, since the lens L on the polishing plate 1 is vertically pressed (pressed from above) by the polishing holder 24, if the polishing plate 1 is oscillated in this state, it will be rotated. It is polished as shown in the figure. That is, if the polishing plate 1 swings back and forth left and right by an angle of θ, the polishing holder 24 can be maintained at the same position as shown in FIG.

FIG. 5 shows how the automatic polishing measurement device is used in the lens polishing mechanism of the present invention.
This diagram mainly illustrates the operation of the polishing holder pressurizing mechanism.

First, Figure A shows the state before polishing, in which the polishing holder 24 and the lens L are not set on the polishing plate 1. In this state, the holder shaft 20 is constantly pressed downward by the spring 23, and the adjustment bolt 34 of the detection plate 35 is in contact with the tip of the measurement terminal 33 of the dial gauge D. At this time, the needle of dial gauge D is set at a position beyond the operating position of dial gauge D. In this state, the switch of the dial gauge D is stopped, and the operation of the holder shaft 20 is also stopped.

Next, when the lens L and the polishing holder 24 are inserted between the polishing plate 1 and the holder shaft 20 in the state shown in Fig. A, the state shown in Fig. B will be obtained. At this time, the polishing holder 24 is set by pushing up the tip of the holder shaft 20 and inserting it. When set in this way, the holder shaft 20, which is always pressed downward, is pushed back upward, so
The detection plate 35 is also moved upward. As a result, a gap M is created between the adjustment bolt 34 and the measuring terminal 33, and the tip of the measuring terminal 33 extends upward, so that the lens L on the polishing plate 1 is pressed downward by the polishing holder 24. It turns out. In this case, the needle of dial gauge D returns to the zero scale position directly above as shown by the arrow, so operate the adjustment knob 32 to return dial gauge D to the operating position (for example, the position directly below shown in Figure A). Set. This operating position becomes the measured value of the amount of lens polishing.

Next, when the polishing process is started in the state shown in Fig. B, as the lens L is ground as shown in Fig. C, the holder shaft 20 is moved downward little by little, so that the adjustment bolt 34 is aligned with the measuring terminal 33.
The needle of the dial gauge D will rotate in the direction of the arrow by touching the tip of the dial gauge D and pushing it downward. If the dial gauge D is polished to the operating position in this state, the needle will stop at the position shown in Figure 2, so that the rotation of the spindle 3 will stop and the polishing process will also stop at the same time. Once the lens polishing process is completed in this way,
When the polishing holder 24 and lens L are removed from the polishing plate 1, the holder shaft 20 returns to the state shown in FIG.

FIG. 6 shows the use of the apparatus of the present invention shown in FIG. 4, especially the lens polishing state.

First, as shown in Fig.
The tip of the polishing holder 24 is screwed in an O-ring state to a polishing holder 24 whose central portion is formed into a V-shape. Further, the polishing holder 24 is attached to the holder shaft 20 so as to be rotatable about the point P of the holder shaft 20.

Therefore, as shown in Figure B, the holder shaft 2
The lens L, which is pressurized between the polishing holder 24 and the polishing plate 1, which is pressurized at 0, is swung while the polishing plate 1 rotates while being vertically pressed by the polishing holder 24. It will be polished by hand. In other words, the polishing holder 24 becomes swingable with respect to point P and at the same time its rotation is dependent on the polishing plate 1. As a result, the polishing plate 1 is rotated while swinging about the O point.

This polishing state will be further explained with reference to FIG. Therefore, the lens L is stabilized at a position where the center line of the lens L overlaps the line connecting the point O, which is the R center point of the polishing plate 1, and the point P. Therefore, the polishing of the lens L proceeds parallel to the line connecting the points P-O. In other words, as shown in Figure 2,
When the center line of the lens L and the polishing plate 1 match,
Since the lens is not cut, it will always be processed off-center. On the other hand, if the lens deviates from the center line, the lens will rotate due to rotation in the outer radial direction at a high circumferential speed. In this case, since the rotational position of the lens is shifted from the center of the polishing plate 1, half of the lens rotates in the opposite direction to the rotation of the polishing plate 1 (due to frictional resistance).
becomes. Therefore, the circumferential speed of the polishing plate 1 and the lens L
The amount of wear on the lens L can be made uniform by using the swing angles that match the amount of wear on the lens L.

〔Effect of the invention〕

The present invention has many advantages over the conventional system as follows.

A. In a polishing device for spherical lenses, the thickness adjustment of the polished lens can be automatically controlled. B. The polishing device itself is configured to automatically stop when it has been polished to a predetermined thickness. Therefore, it is possible to always automatically polish thick lenses to the desired thickness.

C. With the conventional method, it was necessary to constantly adjust the guideline while operating, but by installing this device, this operation is not necessary at all, and the wall thickness can be adjusted entirely automatically.

D. Since the adjustment itself of this device is simple and easy to operate, it can be easily operated even without special skill.

E) Since there are no errors in measurement using measuring instruments or in setting errors in equipment, it is possible to obtain products of uniform and good quality.

F) Products that require high precision require particularly high reliability, so
Products with high precision, which had been considered difficult, can now be easily obtained.

G. The time required for polishing operations and work etc. can be shortened.
Work efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram showing a conventional lens polishing device, FIG. 2 is a schematic explanatory diagram of the conventional device shown in FIG. FIG. 4 is an enlarged explanatory diagram showing the main parts, FIG. 4 is an explanatory outline diagram showing the usage state of the device of the present invention in accordance with FIG. 3, FIG. 5 is a partially enlarged explanatory diagram showing the polishing state of the lens, and FIG. is an enlarged explanatory diagram showing a dial gauge. DESCRIPTION OF SYMBOLS 1... Polishing plate, 3... Spindle, 11... Sleeve, 12... Center shaft, 20... Holder shaft, 20a... Locking ball, 21... Holder arm, 23... Spring, 24... Polishing Holder, 30...Dial indicator, 3
1... Lead wire, 32... Adjustment knob, 33...
Measuring terminal, 34...adjustment bolt, 35...detection plate, A...polishing plate rotation and swing mechanism, B...polishing holder fixing and pressure mechanism, D...dial gauge.

Claims (1)

[Scope of Claims] 1. A polishing plate swinging mechanism that rotates a polishing plate connected to a driving spindle and swings a lens polishing box in which the spindle is installed; In a lens polishing device that includes a polishing holder pressure mechanism that presses the lens by pressing the polishing holder from the vertical direction, and further polishes the lens by swinging the polishing plate at a position offset from the R center position of the polishing plate. A holder that is provided with a dial gauge for measuring the amount of lens polishing that is equipped with a measuring terminal that automatically measures the amount and an adjustment knob that sets the measured amount, and a holder shaft that can move the dial gauge up and down is inserted. attached to the arm, and the holder shaft is locked to the holder arm via a spring to press the abrasive holder,
Furthermore, a detection plate is provided with an adjustment bolt that operates the measurement terminal of the dial gauge to adjust the amount of polishing of the lens, and the detection plate is attached to the upper part of the holder shaft, and the adjustment bolt and measurement terminal are connected to each other. An automatic polishing measuring device for a lens polishing mechanism, characterized in that the polishing holder pressurizing mechanism polishes the lens polishing amount according to the measurement value set on the dial gauge by the contact operation of the dial gauge. 2. The automatic polishing measuring device for a lens polishing mechanism according to claim 1, wherein the dial gauge is fixed to the holder arm via a mounting plate, and the measuring terminal is mounted in a state facing the adjustment bolt.