EP0235021A2 - Lens grinding apparatus - Google Patents
Lens grinding apparatus Download PDFInfo
- Publication number
- EP0235021A2 EP0235021A2 EP87400291A EP87400291A EP0235021A2 EP 0235021 A2 EP0235021 A2 EP 0235021A2 EP 87400291 A EP87400291 A EP 87400291A EP 87400291 A EP87400291 A EP 87400291A EP 0235021 A2 EP0235021 A2 EP 0235021A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- lens
- grinding wheel
- grinding
- outer diameter
- wearout
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/18—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the presence of dressing tools
- B24B49/183—Wear compensation without the presence of dressing tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
- B24B9/148—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms electrically, e.g. numerically, controlled
Definitions
- This invention relates to a lens grinding apparatus.
- a lens edging or bevelling machine as one of lens grinding apparatuses, there are two kinds; one is a coarse grinding tool or coarse grinding wheel having a large grinder grain size and the other is a finish grinding tool or finish grinding wheel having a fine grinder grain size.
- a lens is roughly ground by the coarse grinding wheel copying a template and, thereafter, is subjected to a V-edge or V-bevelling treatment using the finish grinding tool.
- the conventional lens edging or bevelling machine are provided with a mechanism for manually adjusting the height of a template receiver for each grinding wheel in order to correct the wearout quantity (hereinafter simply referred to as wearout-correction) of the above-mentioned grinding wheels.
- the present invention was accomplished in order to eliminate the afore-mentioned drawbacks of the prior art.
- a lens grinding apparatus having a lens rotating shaft on which a lens to be ground is mounted and a grinding wheel for grinding the lens
- the lens grinding apparatus comprises outer diameter measuring means for measuring the outer diameter of the grinding wheel, arithmetic means for calculating a wearout quantity of the grinding wheel based on the measurement made by the measuring means, adjusting means for adjusting an intershaft distance between the lens rotating shaft and a grinding wheel rotating shaft, and control means for controlling the adjusting means based on the wearout quantity and performing a wearout-correction.
- the control means controls the adjusting means based on the wearout quantity of the grinding wheel and adjusts the intershaft distance between the lens rotating shaft and the grinding wheel at the final grinding position of the lens to be ground.
- Figs. 1 through 7 show one embodiment of the present invention, in which;
- Figs. 1 through 7 illustrate one embodiment of the present invention.
- Fig. 1 illustrate a perspective view, partly cut out, of a lens edging or bevelling machine as a lens grinding apparatus.
- 1 denotes a housing-like main body opened up upwardly of a lens edging or bevelling machine
- 2 denotes a rear wall of the main body 1
- 3 denotes a bottom wall of the main body 1.
- the rear wall 2 is integrally provided at its generally central portion with bearing projections 4, 4 projecting upwardly therefrom.
- a carriage revolving shaft 5 is rotatably and movably held through a bearing 6 for movement in the axial direction.
- rear side pieces 7a, 7b projecting from both sides of the rear end of the carriage 7 are fixed.
- pulley shafts 8, 9 extending upwardly are fixed. On upper end portions of the pulley shafts 8, 9, pulleys 10, 11 are rotatably held.
- a cross feed motor 12 disposed adjacent to the pulley shaft 8 is fixed.
- a drive pulley 13 is fixed.
- both end portions of a wire 14 looped around the pulleys 10, 11 and the drive pulley 13 are fixed.
- the cross feed motor 12 a pulse motor is used as the cross feed motor 12.
- projecting portions 7c, 7d for holding the shaft are integrally provided.
- a lens rotating shaft 15A parallel with the carriage revolving shaft 5 is revolvably and longitudinally unmovably held.
- a lens rotating shaft 15B having an axial line in alignment with the lens rotating shaft 15A is rotatably and movably held for movement in the axial direction.
- 16 denotes a handle adapted to adjust the movement of the lens rotating shaft 15B in the axial direction
- 17 denotes a reference circular plate made of metal or hard plastic and held between the lens rotating shafts 15A, 15B.
- the reference circular plate 17 is provided with a V-block portion 17a having the same angle as a V-groove of a V-edge grinding wheel 23 (finish grinding wheel) on its periphery and a mounting seat 17b at its center (see Figs. 4 and 5).
- 18 denotes a reference template detachably attached to an outer end portion of the lens shaft 15A.
- the reference template 18 has the same diameter as that of the reference circular plate 17 (see Figs. 2 and 3).
- the lens rotating shafts 15A, 15B are rotated by a motor (not shown).
- a bracket 19 projecting from the bottom wall 3 of the main body 1 is provided under the free end portion of the carriage 7, a bracket 19 projecting from the bottom wall 3 of the main body 1 is provided.
- a grinder shaft 20 parallel with the lens rotating shafts 15A, 15B is rotatably held on the grinder shaft 20, a grinding wheel 21 is detachably fixed.
- the grinding wheel 21 comprises a coarse grinding wheel 22 and a V-edge grinding wheel 23.
- a template receiver 24, a template receiver lifting motor 25 and a power transmission mechanism 26 are provided under the reference template 18, a template receiver 24, a template receiver lifting motor 25 and a power transmission mechanism 26 are provided.
- the template receiver 24 comprises a pedestal 27, a movable type template receiving piece 28 provided on the pedestal 27, a pivot shaft 29 pivotally supporting the movable type template receiving piece 28 on the pedestal 27 so that the movable type template receiving piece 28 can pivot up and down, and a spring 30 for energizing the movable type template receiving piece 28 upwardly.
- the movable type template receiving piece 28 is formed in an arcuate shape in its side view, and the curvature of its upper surface 28a is the same as the curvature of the outer periphery of the grinding wheel 21.
- a microswitch 31 as an outer diameter measuring means is fixed.
- the template receiver lifting motor 25 is fixed on the bottom wall 3 of the main body 1. As the template receiver lifting motor 25, a pulse motor is used.
- the power transmission mechanism 26 includes a pinion 32 fixed to the output shaft of the template receiver lifting motor 25, a gear 33 meshed with the pinion 32 and rotatably supported by the bottom wall 3 through a template receiver supporting table (not shown), and a feed screw 34 threadedly engaged with the center of the gear 33 for reciprocal movement and fixed to the under surface of the pedestal 27.
- a guide means adapted to vertically guide the pedestal 27 while preventing the horizontal pivot of the pedestal 27 is provided.
- the arithmetic control circuit 35 is inputted with an on-off signal from the microswitch 31 through a NOT circuit (inverter) 36 and also with on-off signals from a correct quantity input switch 37 and a correction start switch 38.
- the arithmetic control circuit 35 is adapted to control the generation and stop generation of pulse of a pulse generator 39 and change over a change-over switch 40 to any one of the positions at the normal rotation side/neutral position/reverse rotation side, so that the pulse outputted from the pulse generator 39 is inputted into the template receiver lifting motor 25 through the change-over switch 40, while the pulse outputted from the pulse generator 39 is inputted into the cross feed motor 12 through the change-over switch 41.
- the pulse outputted from the pulse generator 39 is inputted into a resettable counter 42 by the arithmetic control circuit 35, and the pulse quantity counted by the counter 42 is inputted into the arithmetic control circuit 35.
- the arithmetic control circuit 35 is adapted to input the pulse quantity counted by the counter 42 when the template receiver lifting motor 25 is at work into a template receiver lifting data memory 44 and to calculate the respective wearout quantities of the coarse grinding wheel 22 and the V-edge grinding wheel 23 based on the data inputted, and then to input the calculated results into a wearout-correction data memory 43. And, when the wearout quantity of the grinding wheel 21 becomes a predetermined value and more, the arithmetic control circuit 35 actuates an indicator 45 to inform the time for exchanging the grinding wheel 21.
- the arithmetic control circuit 35 is adapted to calculate the cross feed quantity of the cross feed motor 12 according to the input from the correction quantity input switch 37 and input the calculated results into a cross feed data memory 46.
- the arithmetic control circuit 35 is adapted to read a lifting data from the wearout-correction data memory 43 to control the pulse number to be inputted into the template receiver lifting motor 25 and also the read data from the cross feed data memory 46 to control the pulse number to be inputted into the cross feed motor 12.
- the carriage 7 is held in the initial position by a carriage lifting position supporting apparatus (not shown) known per se, and an operator mounts the reference circular plate 17 and the reference template 18 on the lens rotating shafts 15A, 15B in the Step S1.
- a lens to be ground is ground at the center of a grinding surface of a coarse grinding wheel.
- the coarse grinding wheel 22 is wide enough compared with the lens to be ground, the portion excluding the center of the grinding surface is hardly worn.
- the operator properly changes the position from where the lens to be ground is dropped on the grinding surface of the coarse grinding wheel 22 (i.e., correction) so that the grinding surface is evenly worn out, thereby to prolong the service life of the coarse grinding wheel 22.
- Step S2 in order to designate a position of the grinding surface of the coarse grinding wheel 22 which is to be measured in outer diameter, the operator inputs this correct quantity into the arithmetic control circuit 35 through the correct quantity input switch 37 on a key board. Due to the foregoing, the arithmetic control circuit 35 allows the cross feed data memory 46 to memorize the correct quantity as carriage feed quantity data.
- Step S3 when the correction start switch 38 is turned on, the arithmetic control circuit 35 changes over the change-over switch 40 to the normal rotation side and, at the same time, actuates the pulse generator 39, then causes the template receiver lifting motor 25 to rotate normally, then causes the template receiver 24 to move upwardly, then causes the template receiving surface 38a to abut against the reference template 18 and then turns the microswitch 31 on.
- the "on" signal from the microswitch 31 causes the output of the inverter 36 to the arithmetic control circuit 35 to become low level.
- the arithmetic control circuit 35 changes over the change-over switch 40 to the neutral position and, at the same time, stops the generation of the pulse from the pulse generator 39. Furthermore, it cancels the carriage support of the carriage lifting position supporting apparatus (not shown) known per se.
- the arithmetic control circuit 35 changes over the change-over switch 41 to the normal rotation side and, at the same time, actuates the pulse generator 39 and counter 42. Due to the foregoing, the cross feed motor 12 is rotated normally to cause the carriage 7 to move laterally.
- the arithmetic control circuit 35 interprets that the count value of the counter 42 reached the predetermined cross feed quantity, i.e., the quantity for which the reference circular plate 17 is positioned at an upper part of the center of the grinding surface of the coarse grinding wheel 22, it causes the change-over switch 41 to return to its neutral position and, at the same time, causes the pulse generator 39 to stop and resets the counter 42. Due to the foregoing, the reference circular plate 17 is positioned at the upper part of the coarse grinding wheel 22.
- Step S5 the arithmetic control circuit 35 interprets whether the measurement on the outer diameter of the coarse grinding wheel has been completed or not. When the measurement is interpreted as completed, it goes to the following Step S ⁇ 6. Since the measurement is not completed in this description of the operation, it moves to the following Step 6 in which the arithmetic control circuit 35 interprets whether the correction is necessary or not depending on whether the data are memorized in the cross feed data memory 46 or not and, when necessary, it goes to the following Step S7 but, when unnecessary, it goes to the Step S9.
- the arithmetic control circuit 35 changes over the change-over switch 41 to the normal rotation side or reverse rotation side according to the memory of the program memory 47 and causes the pulse generator 39 to generate a pulse to rotate the cross feed motor 12 normally or reveresly. Due to the foregoing, the output of rotation of the cross feed motor 12 is transmitted to the wire 14 through the output shaft 12a and drive pulley 13 and the carriage 7 is moved toward the pulley 11 or 10 of Fig. 1. In such movement, the counter 42 counts the pulse from the pulse generator 39 and inputs the count quantity into the arithmetic control circuit 35.
- the arithmetic control circuit 35 when the count quantity became the quantity corresponding to the cross feed data of the cross feed data memory 46, stops the generation of pulse from the pulse generator 39 and returns the change-over switch 41 to the neutral position side to stop the actuation of the cross feed motor 12.
- the cross feed position of the reference circular plate 17 is brought to be in alignment with the outer diameter measuring position on the grinding surface which is to be ground.
- the arithmetic control circuit 35 causes the pulse generator 39 to generate a pulse according to the memory of the memory program 47 in the Step S8 and changes over the change-over switch 40 to the reverse rotation side to rotate the template receiver lifting motor 25 reversely.
- the rotation of the template receiver lifting motor 25 causes the power transmission mechanism 26 to be actuated, the template receiver 24 is moved downwardly, and the the free end portion of the carriage 7 and the reference circular plate 17 held thereon are moved downwardly by a predetermined quantity.
- the counter 42 counts the pulse from the pulse generator 39 and inputs the count quantity into the arithmetic control circuit 35.
- the action of the template receiver 24 is repeated until the reference circular plate 17 is abutted against the coarse grinding wheel 22 and the microswitch 31 is turned off.
- the pulse generated from the pulse generator 39 according to the action of the template receiver lifting motor 25 is counted by the counter 42 and inputted into the arithmetic control circuit 35.
- the inverter 36 becomes high level and the arithmetic control circuit 35 makes the change-over switch 40 neutral to stop the rotation of the motor 25 and, at the same time, to stop the generation of a pulse from the pulse generator 39.
- Step 10 in which the arithmetic control circuit 35 calculates the outer diameter of the coarse grinding wheel 22 and the difference between such outer diameter measuring value and a known outer diameter value of an unused coarse grinding wheel as a wearout quantity based on the pulse number from the counter 42 and inputs the wearout quantity into the wearout-correction data memory 43.
- the arithmetic control circuit 35 interprets whether the wearout quantity of the coarse grinding wheel 22 is within the predetemined value or not (i.e., whether the grinding wheel must be exchanged or not) in the Step 11 and, when the wearout quantity is the predetermined value and more, actuates the indicator 45 to warn the necessity of the exchange of a grinding wheel in the Step S12.
- the wearout quantity is within the predetermined value, it goes to the Step 13 in which it is interpreted whether the measurement on the outer diameter of the V-edge grinding wheel 23 is completed or not. And, when not completed, it goes to the Step S5. After it is interpreted that the measurement on the outer diameter of the coarse grinding wheel is completed in the Step S5, it goes to the Step S ⁇ 6.
- Step S ⁇ 6 the change-over switch 41 is changed over to the normal rotation side as in the same procedure in the Step S4, the cross feed motor 12 is rotated normally, the carriage 7 is moved toward the pulley 11, and the V-edge 17a of the reference circular plate 17 and the V-groove grinding surface of the V-edge grinding wheel 23 are brought to be in alignment with respect to each her.
- the control action of the arithmetic control circuit 35 goes to the Step S6.
- the procedures of the Steps S8 to S12 are performed, and the measurement on the outer diameter of the V-edge grinding wheel 23 and the wearout correct value are computed.
- the template receiver lifting motor 25 is rotated normally according to the pulse from the pulse generator 39, the cross feed motor 12 is rotated reversely after the template receiver 24 is lifted upwardly by a predetermined quantity, the carriage 7 is moved to its initial position side, the reference template 18 and the reference circular plate 17 to be ground are returned to their initial positions in the Step S15, the carriage supporting apparatus (not shown) known per se is actuated to hold the carriage 7 in the lifted position and, thereafter, the template receiver 24 is moved downwardly to the initial position.
- the measurement on the outer diameters of the coarse grinding wheel 22 and V-edge grinding wheel 23 and the calculation of the wearout quantity are completed.
- the respective wearout-correction values of the coarse grinding wheel 22 and V-edge grinding wheel 23, which are memorized in the memory of the wearout-correction data memory 43, are added to the predetermined downward movement quantity of the template receiver 24 to move the template receiver 24 downwardly and the known lens grinding action is started in the foregoing state.
- Fig. 8 shows a second embodiment of the present invention.
- a disk plate 47 having the similar shape to the reference circular plate 17 is fixed to a portion of the lens rotating shaft 15A adjacent to the template mounting portion and, when the outer diameter is measured, the disk plate 47 instead of the reference template 18 is abutted against the template receiver 24.
- the disk plate 47 is formed smaller than the least radius of the template 24 for grinding a lens. Due to the foregoing, it will be an obstacle to the downward movement when the lens is ground.
- Figs. 9 and 10 show a third embodiment of the present invention.
- a gear 48 is fixed to the carriage revolving shaft 5
- a spline shaft 49 disposed parallel with the carriage revolving shaft 5 and adjacent to the gear 48 is rotatably held on the main body 1
- a gear 50 meshed with the gear 48 is an arm 51 integrally formed with the carriage revolving shaft 5 and moves integrally with the gear 48.
- a gear 52 is fixed to the spline shaft 49.
- Another gear 53 meshed with the gear 52 is associated with a pulse motor 55 at the main body 1 side through the clutch 54.
- a disk plate 56 having the same shape to the reference circular plate is held.
- a microswitch 57 which is normally turned off, is provided.
- 57a denote a code for inputting a detection signal from the microswitch 57 to the arithmetic control circuit 35.
- the free end portion of the carriage 7 is lifted up and down through the pulse motor 55, clutch 54 and the series of gears 48 to 53 and the pulse number to the pulse motor 55 is counted when the microswitch 57 abuts against the grinding wheel 21, thereby to compute the wearout quantity of the grinding wheel 21 from the pulse number.
- the clutch 54 is disengaged to cut out the connection between the gear 53 and pulse motor 55 thereby to ensure a free revolving of the carriage as in the case of the known lens edging or bevelling machine.
- Figs. 11 through 14 show a fourth embodiment of the present invention.
- a digital gage 58 attached to the main body 1 using a code 58a is held between the lens rotating shafts 15A, 15B, a filler 58b of the digital gage 58 is abutted against the periphery of the grinding wheel 21 to measure the outer diameter of the grinding wheel 21.
- Fig. 15 shows a fifth embodiment of the present invention.
- a digital gage 59 is held on the main body 1 side and the outer diameter of the grinding wheel 21 is measured.
- the axial line of a filler 59a of the digital gage 59 is in alignment with the center of rotation of the grinding wheel 21.
- a lens grinding apparatus of the present invention was applied to a lens edging or bevelling machine.
- the lens grinding apparatus of the present invention is of course applicable to a centering apparatus.
- the present invention is constituted as such that a lens grinding apparatus has a lens rotating shaft on which a lens to be ground is mounted and a grinding wheel for grinding the lens, characterized in that the lens grinding apparatus comprises outer diameter measuring means for measuring the outer diameter of the lens, arithmetic means for calculating a wearout quantity of the grinding wheel based on a measurement made by the measuring means, adjusting means for adjusting an intershaft distance between the lens rotating shaft and a grinding wheel rotating shaft, and control means for controlling the adjusting means based on the wearout quantity and performing a wearout correction. Accordingly, the outer diameter of the grinding wheel can be automatically measured with a simple constitution and the wearout correction of a grinding wheel can be automatically performed based on such obtained result when a lens is ground.
- a lens grinding apparatus of the invention employs the outer diameter measuring means comprising a filler to be abutted against the grinding wheel, a filler moving quantity measuring means for measuring the moving quantity of the filler, the outer diameter of the grinding wheel can be accurately corrected with a simple constitution and, in addition, since other lens edging or bevelling machines having the similar constitution of circuit and this filler moving quantity measuring means can be commonly used, the present invention is particularly effective when employed in a lens working center, etc., in which many lens edging or bevelling machines are used.
- a lens grinding apparatus of the present invention employs the adjusting means comprising a revolving means for revolving the carriage and the outer diameter measuring means comprising a drive measuring means for measuring the drive quantity of the revolving means and a grinding wheel abutment sensing means
- the present invention can be carried out without largely modifying the conventional lens edging or bevelling machine.
- a lens grinding apparatus of the present invention employs the adjusting means comprising a template receiver moving means and the outer diameter measuring means comprising the template receiver moving means and a reference circular plate to be mounted on the lens rotating shaft, the adjusting means and outer diameter measuring means can be commonly used by the template receiver moving means.
- the template receiver moving means can be commonly used by the adjusting means and outer diameter measuring means.
- a lens grinding apparatus of the present invention employs the outer diameter measuring means comprising the template receiver moving means, the reference circular plate to be mounted on the lens rotating shaft, and a template to be mounted on the lens rotating shaft and having the similar shape to the reference circular plate.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
Description
- This invention relates to a lens grinding apparatus.
- As for a lens edging or bevelling machine as one of lens grinding apparatuses, there are two kinds; one is a coarse grinding tool or coarse grinding wheel having a large grinder grain size and the other is a finish grinding tool or finish grinding wheel having a fine grinder grain size. According to such conventional lens grinding apparatuses, a lens is roughly ground by the coarse grinding wheel copying a template and, thereafter, is subjected to a V-edge or V-bevelling treatment using the finish grinding tool.
- Because of the foregoing reason, since the grinding quantity or stock removal using the coarse grinding wheel is much larger than that of the finish grinding wheel, the wearout quantity of the coarse grinding wheel becomes larger than that of the finish grinding wheel.
- Because of the foregoing reason, when such grinding wheels are used for long time, the grinding quantity of the coarse grinding wheel is reduced and the grinding quantity of the finish grinding wheel is increased, thereby to necessitate a longer working time.
- In view of the above, the conventional lens edging or bevelling machine are provided with a mechanism for manually adjusting the height of a template receiver for each grinding wheel in order to correct the wearout quantity (hereinafter simply referred to as wearout-correction) of the above-mentioned grinding wheels.
- In general, an operator of the grinding wheels has a difficulty in finding the changes of working state due to the difference in wearout quantities of the grinding wheel. Because of the foregoing reason, it is an actual practice that the wearout-correction is not performed on the grinding wheels, but the lens worked is measured in diameter to merely correct the finish size. In this way, the lens was often worked in an incorrect state.
- When the grinding is performed in the foregoing state, since the coarse grinding wheel is more rapidly worn than the finish grinding wheel, the difference of diameter between the coarse grinding wheel and the finish grinding wheel becomes larger and, therefore, the quantity ground by the finish grinding wheel becomes larger, which invites the drawbacks in that the grinding time is increased and the finish grinding wheel, which is more expensive, is worn out more quickly.
- Further, when the wearout-correction is performed, it is difficult for the operator of the grinding wheel to effect the correction directly and it is a usual practice that a service man who is an expert in this field chiefly takes care of it.
- The present invention was accomplished in order to eliminate the afore-mentioned drawbacks of the prior art.
- It is therefore the object of the present invention to provide a lens grinding apparatus, wherein the outer diameter of a grinding wheel is automatically measured with a simple constitution and, based on the measurement, the wearout-correction of the grinding wheel is performed during grinding operation.
- In order to achieve the above object, there is essentially provided a lens grinding apparatus having a lens rotating shaft on which a lens to be ground is mounted and a grinding wheel for grinding the lens, CHARACTERIZED IN THAT the lens grinding apparatus comprises outer diameter measuring means for measuring the outer diameter of the grinding wheel, arithmetic means for calculating a wearout quantity of the grinding wheel based on the measurement made by the measuring means, adjusting means for adjusting an intershaft distance between the lens rotating shaft and a grinding wheel rotating shaft, and control means for controlling the adjusting means based on the wearout quantity and performing a wearout-correction.
- With the above-described constitution of the present invention, when the positions of the periphery of the grinding wheel, etc. are measured by the outer diameter measuring means, the outer diameter of the grinding wheel and the wearout quantity are computed by the arithmetic means from the measured value of the outer diameter measuring means. And, the control means controls the adjusting means based on the wearout quantity of the grinding wheel and adjusts the intershaft distance between the lens rotating shaft and the grinding wheel at the final grinding position of the lens to be ground.
- For a better understanding of the present invention, together with other and further objects thereof, reference is made to the following description, taken in connection with the accompanying drawings, wherein:
Figs. 1 through 7 show one embodiment of the present invention, in which; - Fig. 1 is a perspective view, partly omitted, of a lens edging or bevelling machine (lens grinding apparatus);
- Fig. 2 is a front view of the reference template of Fig. 1;
- Fig. 3 is a side view of Fig. 2;
- Fig. 4 is a front view of the lens to be ground of Fig. 1;
- Fig. 5 is a left side view of Fig. 4;
- Fig. 6 is an electric circuit of the lens edging or bevelling machine of Fig. 1;
- Figs. 7(A), 7(B) and 7(C) are flow charts of the lens edging or bevelling machine of Fig. 1;
- Fig. 8 is a partly plan view of a carriage according to a second embodiment of the present invention;
- Fig. 9 is a schematic view of a lens edging or bevelling machine according to a third embodiment of the present invention;
- Fig. 10 is a plan view of Fig. 9;
- Fig. 11 is a schematic view of a lens edging or bevelling machine according to a fourth embodiment of the present invention;
- Fig. 12 is a side view showing the relation among the carriage, grinding wheel and main body of Fig. 11;
- Fig. 13 is a side view of the digital gage of Fig. 11;
- Fig. 14 is a bottom view of Fig. 13; and
- Fig. 15 is a schematic view of a fifth embodiment of the present invention.
- One preferred embodiment of the present invention will be described hereinafter with reference to the accompanying drawings.
- Figs. 1 through 7 illustrate one embodiment of the present invention.
- Fig. 1 illustrate a perspective view, partly cut out, of a lens edging or bevelling machine as a lens grinding apparatus. In Fig. 1, 1 denotes a housing-like main body opened up upwardly of a lens edging or bevelling machine, 2 denotes a rear wall of the
main body 1, and 3 denotes a bottom wall of the main body 1. Therear wall 2 is integrally provided at its generally central portion withbearing projections bearing projections carriage revolving shaft 5 is rotatably and movably held through abearing 6 for movement in the axial direction. On both ends of thecarriage revolving shaft 5,rear side pieces carriage 7 are fixed. - At both side portions of the
rear wall 2,pulley shafts pulley shafts pulleys 10, 11 are rotatably held. On therear wall 2, across feed motor 12 disposed adjacent to thepulley shaft 8 is fixed. On anoutput shaft 12a of thecross feed motor 12 extending upwardly, adrive pulley 13 is fixed. And, on therear side pieces carriage 7, both end portions of awire 14 looped around thepulleys 10, 11 and thedrive pulley 13 are fixed. As thecross feed motor 12, a pulse motor is used. - At both sides of a free end portion of the
carriage 7, projectingportions portion 7c, alens rotating shaft 15A parallel with thecarriage revolving shaft 5 is revolvably and longitudinally unmovably held. While, on the other projectingportion 7d, alens rotating shaft 15B having an axial line in alignment with thelens rotating shaft 15A is rotatably and movably held for movement in the axial direction. In the figure, 16 denotes a handle adapted to adjust the movement of thelens rotating shaft 15B in the axial direction, and 17 denotes a reference circular plate made of metal or hard plastic and held between thelens rotating shafts circular plate 17 is provided with a V-block portion 17a having the same angle as a V-groove of a V-edge grinding wheel 23 (finish grinding wheel) on its periphery and amounting seat 17b at its center (see Figs. 4 and 5). 18 denotes a reference template detachably attached to an outer end portion of thelens shaft 15A. Thereference template 18 has the same diameter as that of the reference circular plate 17 (see Figs. 2 and 3). Thelens rotating shafts - Under the free end portion of the
carriage 7, abracket 19 projecting from thebottom wall 3 of the main body 1 is provided. On the upper end portion of thebracket 19, agrinder shaft 20 parallel with thelens rotating shafts grinder shaft 20, a grindingwheel 21 is detachably fixed. The grindingwheel 21 comprises acoarse grinding wheel 22 and a V-edge grinding wheel 23. Under thereference template 18, atemplate receiver 24, a templatereceiver lifting motor 25 and apower transmission mechanism 26 are provided. - The
template receiver 24 comprises apedestal 27, a movable typetemplate receiving piece 28 provided on thepedestal 27, apivot shaft 29 pivotally supporting the movable typetemplate receiving piece 28 on thepedestal 27 so that the movable typetemplate receiving piece 28 can pivot up and down, and aspring 30 for energizing the movable typetemplate receiving piece 28 upwardly. The movable typetemplate receiving piece 28 is formed in an arcuate shape in its side view, and the curvature of itsupper surface 28a is the same as the curvature of the outer periphery of thegrinding wheel 21. On thepedestal 24, amicroswitch 31 as an outer diameter measuring means is fixed. - The template
receiver lifting motor 25 is fixed on thebottom wall 3 of the main body 1. As the templatereceiver lifting motor 25, a pulse motor is used. - The
power transmission mechanism 26 includes apinion 32 fixed to the output shaft of the templatereceiver lifting motor 25, agear 33 meshed with thepinion 32 and rotatably supported by thebottom wall 3 through a template receiver supporting table (not shown), and a feed screw 34 threadedly engaged with the center of thegear 33 for reciprocal movement and fixed to the under surface of thepedestal 27. Between thepedestal 27 and the template receiver supporting table (not shown), a guide means adapted to vertically guide thepedestal 27 while preventing the horizontal pivot of thepedestal 27 is provided. - Next, an electric circuit of the V-edging or bevelling machine will be described with reference to Fig. 6.
- In Fig. 6, the
arithmetic control circuit 35 is inputted with an on-off signal from themicroswitch 31 through a NOT circuit (inverter) 36 and also with on-off signals from a correctquantity input switch 37 and acorrection start switch 38. - The
arithmetic control circuit 35 is adapted to control the generation and stop generation of pulse of apulse generator 39 and change over a change-over switch 40 to any one of the positions at the normal rotation side/neutral position/reverse rotation side, so that the pulse outputted from thepulse generator 39 is inputted into the templatereceiver lifting motor 25 through the change-over switch 40, while the pulse outputted from thepulse generator 39 is inputted into thecross feed motor 12 through the change-over switch 41. Moreover, the pulse outputted from thepulse generator 39 is inputted into aresettable counter 42 by thearithmetic control circuit 35, and the pulse quantity counted by thecounter 42 is inputted into thearithmetic control circuit 35. - The
arithmetic control circuit 35 is adapted to input the pulse quantity counted by thecounter 42 when the templatereceiver lifting motor 25 is at work into a template receiver liftingdata memory 44 and to calculate the respective wearout quantities of thecoarse grinding wheel 22 and the V-edge grinding wheel 23 based on the data inputted, and then to input the calculated results into a wearout-correction data memory 43. And, when the wearout quantity of thegrinding wheel 21 becomes a predetermined value and more, thearithmetic control circuit 35 actuates anindicator 45 to inform the time for exchanging the grindingwheel 21. Moreover, thearithmetic control circuit 35 is adapted to calculate the cross feed quantity of thecross feed motor 12 according to the input from the correctionquantity input switch 37 and input the calculated results into a crossfeed data memory 46. On the other hand, thearithmetic control circuit 35 is adapted to read a lifting data from the wearout-correction data memory 43 to control the pulse number to be inputted into the templatereceiver lifting motor 25 and also the read data from the crossfeed data memory 46 to control the pulse number to be inputted into thecross feed motor 12. - Such calculation and control are progressed in the order shown in the flow charts of Figs. 7(A), 7(B) and 7(C) according to memory memorized in a
program memory 47. - The
carriage 7 is held in the initial position by a carriage lifting position supporting apparatus (not shown) known per se, and an operator mounts the referencecircular plate 17 and thereference template 18 on thelens rotating shafts - In usual grinding, a lens to be ground is ground at the center of a grinding surface of a coarse grinding wheel.
- However, in general, since the
coarse grinding wheel 22 is wide enough compared with the lens to be ground, the portion excluding the center of the grinding surface is hardly worn. - Therefore, the operator properly changes the position from where the lens to be ground is dropped on the grinding surface of the coarse grinding wheel 22 (i.e., correction) so that the grinding surface is evenly worn out, thereby to prolong the service life of the
coarse grinding wheel 22. - Accordingly, in the Step S₂, in order to designate a position of the grinding surface of the
coarse grinding wheel 22 which is to be measured in outer diameter, the operator inputs this correct quantity into thearithmetic control circuit 35 through the correctquantity input switch 37 on a key board. Due to the foregoing, thearithmetic control circuit 35 allows the crossfeed data memory 46 to memorize the correct quantity as carriage feed quantity data. - Next, in the Step S₃, when the correction start
switch 38 is turned on, thearithmetic control circuit 35 changes over the change-over switch 40 to the normal rotation side and, at the same time, actuates thepulse generator 39, then causes the templatereceiver lifting motor 25 to rotate normally, then causes thetemplate receiver 24 to move upwardly, then causes the template receiving surface 38a to abut against thereference template 18 and then turns themicroswitch 31 on. The "on" signal from themicroswitch 31 causes the output of theinverter 36 to thearithmetic control circuit 35 to become low level. Receiving the low level state of theinverter 36, thearithmetic control circuit 35 changes over the change-over switch 40 to the neutral position and, at the same time, stops the generation of the pulse from thepulse generator 39. Furthermore, it cancels the carriage support of the carriage lifting position supporting apparatus (not shown) known per se. - Then, in the Step S₄, the
arithmetic control circuit 35 changes over the change-over switch 41 to the normal rotation side and, at the same time, actuates thepulse generator 39 andcounter 42. Due to the foregoing, thecross feed motor 12 is rotated normally to cause thecarriage 7 to move laterally. When thearithmetic control circuit 35 interprets that the count value of thecounter 42 reached the predetermined cross feed quantity, i.e., the quantity for which the referencecircular plate 17 is positioned at an upper part of the center of the grinding surface of thecoarse grinding wheel 22, it causes the change-over switch 41 to return to its neutral position and, at the same time, causes thepulse generator 39 to stop and resets thecounter 42. Due to the foregoing, the referencecircular plate 17 is positioned at the upper part of thecoarse grinding wheel 22. - Then, in the Step S₅, the
arithmetic control circuit 35 interprets whether the measurement on the outer diameter of the coarse grinding wheel has been completed or not. When the measurement is interpreted as completed, it goes to the following Step Sʹ₆. Since the measurement is not completed in this description of the operation, it moves to thefollowing Step ₆ in which thearithmetic control circuit 35 interprets whether the correction is necessary or not depending on whether the data are memorized in the crossfeed data memory 46 or not and, when necessary, it goes to the following Step S₇ but, when unnecessary, it goes to the Step S₉. - When the cross correction is interpreted as necessary in the preceding Step S₆, the
arithmetic control circuit 35 changes over the change-over switch 41 to the normal rotation side or reverse rotation side according to the memory of theprogram memory 47 and causes thepulse generator 39 to generate a pulse to rotate thecross feed motor 12 normally or reveresly. Due to the foregoing, the output of rotation of thecross feed motor 12 is transmitted to thewire 14 through theoutput shaft 12a and drivepulley 13 and thecarriage 7 is moved toward thepulley 11 or 10 of Fig. 1. In such movement, thecounter 42 counts the pulse from thepulse generator 39 and inputs the count quantity into thearithmetic control circuit 35. And, thearithmetic control circuit 35, when the count quantity became the quantity corresponding to the cross feed data of the crossfeed data memory 46, stops the generation of pulse from thepulse generator 39 and returns the change-over switch 41 to the neutral position side to stop the actuation of thecross feed motor 12. The cross feed position of the referencecircular plate 17 is brought to be in alignment with the outer diameter measuring position on the grinding surface which is to be ground. - When the Step S₇ is completed, the
arithmetic control circuit 35 causes thepulse generator 39 to generate a pulse according to the memory of thememory program 47 in the Step S₈ and changes over the change-over switch 40 to the reverse rotation side to rotate the templatereceiver lifting motor 25 reversely. The rotation of the templatereceiver lifting motor 25 causes thepower transmission mechanism 26 to be actuated, thetemplate receiver 24 is moved downwardly, and the the free end portion of thecarriage 7 and the referencecircular plate 17 held thereon are moved downwardly by a predetermined quantity. In such downward movement, thecounter 42 counts the pulse from thepulse generator 39 and inputs the count quantity into thearithmetic control circuit 35. - The above-mentioned action is consecutively performed in the Steps S₈, S₉ until the
microswitch 31 is turned off. In this way, the free end portion of thecarriage 7 and the referencecircular plate 17 held thereon are moved downwardly and the referencecircular plate 17 is abutted against the periphery of thecoarse grinding wheel 22. - And, the action of the
template receiver 24 is repeated until the referencecircular plate 17 is abutted against thecoarse grinding wheel 22 and themicroswitch 31 is turned off. Moreover, the pulse generated from thepulse generator 39 according to the action of the templatereceiver lifting motor 25 is counted by thecounter 42 and inputted into thearithmetic control circuit 35. And, when the microswitch is turned off, theinverter 36 becomes high level and thearithmetic control circuit 35 makes the change-over switch 40 neutral to stop the rotation of themotor 25 and, at the same time, to stop the generation of a pulse from thepulse generator 39. Then, it goes to theStep ₁₀, in which thearithmetic control circuit 35 calculates the outer diameter of thecoarse grinding wheel 22 and the difference between such outer diameter measuring value and a known outer diameter value of an unused coarse grinding wheel as a wearout quantity based on the pulse number from thecounter 42 and inputs the wearout quantity into the wearout-correction data memory 43. - Thereafter, the
arithmetic control circuit 35 interprets whether the wearout quantity of thecoarse grinding wheel 22 is within the predetemined value or not (i.e., whether the grinding wheel must be exchanged or not) in the Step ₁₁ and, when the wearout quantity is the predetermined value and more, actuates theindicator 45 to warn the necessity of the exchange of a grinding wheel in the Step S₁₂. On the other hand, when the wearout quantity is within the predetermined value, it goes to theStep ₁₃ in which it is interpreted whether the measurement on the outer diameter of the V-edge grinding wheel 23 is completed or not. And, when not completed, it goes to the Step S₅. After it is interpreted that the measurement on the outer diameter of the coarse grinding wheel is completed in the Step S₅, it goes to the Step Sʹ₆. - In the Step Sʹ₆, the change-
over switch 41 is changed over to the normal rotation side as in the same procedure in the Step S₄, thecross feed motor 12 is rotated normally, thecarriage 7 is moved toward the pulley 11, and the V-edge 17a of the referencecircular plate 17 and the V-groove grinding surface of the V-edge grinding wheel 23 are brought to be in alignment with respect to each her. When this action is completed, the control action of thearithmetic control circuit 35 goes to the Step S₆. Then, the procedures of the Steps S₈ to S₁₂ are performed, and the measurement on the outer diameter of the V-edge grinding wheel 23 and the wearout correct value are computed. - On the other hand, when the measurement of the V-
edge grinding wheel 23 is completed, it goes to the Step S₁₄ in which the change-over switch 40 is changed over to the normal rotation side, the templatereceiver lifting motor 25 is rotated normally according to the pulse from thepulse generator 39, thecross feed motor 12 is rotated reversely after thetemplate receiver 24 is lifted upwardly by a predetermined quantity, thecarriage 7 is moved to its initial position side, thereference template 18 and the referencecircular plate 17 to be ground are returned to their initial positions in the Step S₁₅, the carriage supporting apparatus (not shown) known per se is actuated to hold thecarriage 7 in the lifted position and, thereafter, thetemplate receiver 24 is moved downwardly to the initial position. By this, the measurement on the outer diameters of thecoarse grinding wheel 22 and V-edge grinding wheel 23 and the calculation of the wearout quantity are completed. - When the lens is ground, the respective wearout-correction values of the
coarse grinding wheel 22 and V-edge grinding wheel 23, which are memorized in the memory of the wearout-correction data memory 43, are added to the predetermined downward movement quantity of thetemplate receiver 24 to move thetemplate receiver 24 downwardly and the known lens grinding action is started in the foregoing state. - Fig. 8 shows a second embodiment of the present invention. In this second embodiment, a
disk plate 47 having the similar shape to the referencecircular plate 17 is fixed to a portion of thelens rotating shaft 15A adjacent to the template mounting portion and, when the outer diameter is measured, thedisk plate 47 instead of thereference template 18 is abutted against thetemplate receiver 24. Thedisk plate 47 is formed smaller than the least radius of thetemplate 24 for grinding a lens. Due to the foregoing, it will be an obstacle to the downward movement when the lens is ground. - In this case, there is the advantage in that a reference template is not required when a wearout-correction is performed on the grinding wheel.
- Figs. 9 and 10 show a third embodiment of the present invention.
- In this third embodiment, a
gear 48 is fixed to thecarriage revolving shaft 5, aspline shaft 49 disposed parallel with thecarriage revolving shaft 5 and adjacent to thegear 48 is rotatably held on the main body 1, and agear 50 meshed with thegear 48 is anarm 51 integrally formed with thecarriage revolving shaft 5 and moves integrally with thegear 48. Agear 52 is fixed to thespline shaft 49. Anothergear 53 meshed with thegear 52 is associated with apulse motor 55 at the main body 1 side through the clutch 54. Moreover, between thelens rotating shafts disk plate 56 having the same shape to the reference circular plate is held. At the lower portion of thedisk plate 56, amicroswitch 57, which is normally turned off, is provided. In the figures, 57a denote a code for inputting a detection signal from themicroswitch 57 to thearithmetic control circuit 35. - With the constitution described above, the free end portion of the
carriage 7 is lifted up and down through thepulse motor 55, clutch 54 and the series ofgears 48 to 53 and the pulse number to thepulse motor 55 is counted when themicroswitch 57 abuts against the grindingwheel 21, thereby to compute the wearout quantity of thegrinding wheel 21 from the pulse number. And when the lens is actually ground, the clutch 54 is disengaged to cut out the connection between thegear 53 andpulse motor 55 thereby to ensure a free revolving of the carriage as in the case of the known lens edging or bevelling machine. - Figs. 11 through 14 show a fourth embodiment of the present invention. In this fourth embodiment, a
digital gage 58 attached to the main body 1 using acode 58a is held between thelens rotating shafts filler 58b of thedigital gage 58 is abutted against the periphery of thegrinding wheel 21 to measure the outer diameter of thegrinding wheel 21. - Fig. 15 shows a fifth embodiment of the present invention. In this fifth embodiment, a
digital gage 59 is held on the main body 1 side and the outer diameter of thegrinding wheel 21 is measured. The axial line of afiller 59a of thedigital gage 59 is in alignment with the center of rotation of thegrinding wheel 21. - In the afore-described embodiments, a lens grinding apparatus of the present invention was applied to a lens edging or bevelling machine. However, the lens grinding apparatus of the present invention is of course applicable to a centering apparatus.
- As apparent from the foregoing description, the present invention is constituted as such that a lens grinding apparatus has a lens rotating shaft on which a lens to be ground is mounted and a grinding wheel for grinding the lens, characterized in that the lens grinding apparatus comprises outer diameter measuring means for measuring the outer diameter of the lens, arithmetic means for calculating a wearout quantity of the grinding wheel based on a measurement made by the measuring means, adjusting means for adjusting an intershaft distance between the lens rotating shaft and a grinding wheel rotating shaft, and control means for controlling the adjusting means based on the wearout quantity and performing a wearout correction. Accordingly, the outer diameter of the grinding wheel can be automatically measured with a simple constitution and the wearout correction of a grinding wheel can be automatically performed based on such obtained result when a lens is ground.
- Furthermore, when a lens grinding apparatus of the invention employs the outer diameter measuring means comprising a filler to be abutted against the grinding wheel, a filler moving quantity measuring means for measuring the moving quantity of the filler, the outer diameter of the grinding wheel can be accurately corrected with a simple constitution and, in addition, since other lens edging or bevelling machines having the similar constitution of circuit and this filler moving quantity measuring means can be commonly used, the present invention is particularly effective when employed in a lens working center, etc., in which many lens edging or bevelling machines are used.
- Furthermore, when a lens grinding apparatus of the present invention employs the adjusting means comprising a revolving means for revolving the carriage and the outer diameter measuring means comprising a drive measuring means for measuring the drive quantity of the revolving means and a grinding wheel abutment sensing means, the present invention can be carried out without largely modifying the conventional lens edging or bevelling machine.
- Furthermore, when a lens grinding apparatus of the present invention employs the adjusting means comprising a template receiver moving means and the outer diameter measuring means comprising the template receiver moving means and a reference circular plate to be mounted on the lens rotating shaft, the adjusting means and outer diameter measuring means can be commonly used by the template receiver moving means. Thus, a simple constitution can be obtained.
- The same is true when a lens grinding apparatus of the present invention employs the outer diameter measuring means comprising the template receiver moving means, the reference circular plate to be mounted on the lens rotating shaft, and a template to be mounted on the lens rotating shaft and having the similar shape to the reference circular plate.
- While certain specific details have been described for the purpose of optimum presentation of the advantageous features of the present invention, various modifications will be apparent to those skilled in the art without departing from the scope or spirit of the present invention.
Claims (5)
outer diameter measuring means for measuring the outer diameter of the grinding wheel;
arithmetic means for calculating a wearout quantity of the grinding wheel based on a measurement made by said measuring means;
adjusting means for adjusting an intershaft distance between the lens rotating and a grinding wheel rotating shaft; and
control means for controlling said adjusting means based on the wearout quantity and performing a wearout correction.
a filler for abutting against said grinding wheel; and
filler moving quantity measuring means for measuring a moving quantity of said filler.
said adjusting means is turning means for turning a carriage, and said outer diameter measuring means comprises:
driving quantity measuring means for measuring a driving quantity of said turning means; and
grinding wheel abutment sensing means mounted on said lens rotating shaft.
said adjusting means is template supporting table moving means, and said outer diameter measuring means comprises:
said template supporting table moving means; and
a reference circular plate to be mounted on said lens rotating shaft.
said adjusting means is said template supporting table moving means, and said outer diameter measuring means comprises:
said template supporting table moving means;
a reference circular plate to be mounted on said lens rotating shaft; and
a reference template to be mounted on said lens rotating shaft and having a similar configuration to that of said reference circular plate.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61027674A JPH0632892B2 (en) | 1986-02-10 | 1986-02-10 | Lens grinding machine |
JP27674/86 | 1986-02-10 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0235021A2 true EP0235021A2 (en) | 1987-09-02 |
EP0235021A3 EP0235021A3 (en) | 1988-02-24 |
EP0235021B1 EP0235021B1 (en) | 1992-09-23 |
Family
ID=12227498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87400291A Expired - Lifetime EP0235021B1 (en) | 1986-02-10 | 1987-02-09 | Lens grinding apparatus |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0235021B1 (en) |
JP (1) | JPH0632892B2 (en) |
DE (1) | DE3781815T2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3938332A1 (en) * | 1988-11-22 | 1990-05-23 | Briot Int | Spectacle lens grinding machine - has carriage supporting arm with attached measuring sensor for grinding weight regulation |
FR2644718A1 (en) * | 1989-03-23 | 1990-09-28 | Briot Internal | DEVICE FOR RE-CALIBRATING A MACHINE FOR GRINDING OPHTHALMIC GLASSES TO REPAIR THE WEAR OF THE WHEEL |
EP0444902A2 (en) * | 1990-02-27 | 1991-09-04 | BAUSCH & LOMB INCORPORATED | Lens edging system |
EP0603074A1 (en) * | 1992-12-18 | 1994-06-22 | ESSILOR INTERNATIONAL Compagnie Générale d'Optique | Process for checking the fitting of a lens to be grinded to a spectacle frame on a grinding machine |
FR2867409A1 (en) * | 2004-03-09 | 2005-09-16 | Vallon | Circular rotating cutting tool wear out compensating device, has programmable controller to control motor for obtaining constant circumferential speed of tool and to control jack for adjusting downward movement of tool |
EP2505306A1 (en) * | 2011-03-30 | 2012-10-03 | Nidek Co., Ltd. | Eyeglass lens periphery processing apparatus |
CN113814825A (en) * | 2021-10-19 | 2021-12-21 | 林国武 | New material round edge trimming device and rapid trimming method using same |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2638926B2 (en) * | 1988-05-25 | 1997-08-06 | 松下電器産業株式会社 | Spherical grinding machine and shape accuracy maintenance method |
JPH0373267A (en) * | 1989-08-11 | 1991-03-28 | Kanto Special Steel Works Ltd | Measurement of work diameter in roll grinder and measuring device thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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DE2934066A1 (en) * | 1979-08-23 | 1981-04-09 | Gebrüder Hau Maschinenfabrik GmbH & Co, 6050 Offenbach | Disc setting control for grinding or polishing machine - uses motor current and disc diameter to obtain regulating signal compared with reference |
US4286415A (en) * | 1979-03-12 | 1981-09-01 | Ait Industries, Inc. | Method of edging lenses |
EP0131743A2 (en) * | 1983-06-16 | 1985-01-23 | Pilkington Visioncare, Inc. | Calibration gauge for computer-controlled lens generator or the like |
US4499690A (en) * | 1983-03-10 | 1985-02-19 | E. D. Coddington Manufacturing Company | Split stations surface grinding apparatus |
EP0143468A2 (en) * | 1983-11-29 | 1985-06-05 | Tokyo Kogaku Kikai Kabushiki Kaisha | Edge grinding method and apparatus |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5914462A (en) * | 1982-07-15 | 1984-01-25 | Toshiba Corp | Grindstone abrasion correcting device |
-
1986
- 1986-02-10 JP JP61027674A patent/JPH0632892B2/en not_active Expired - Lifetime
-
1987
- 1987-02-09 DE DE19873781815 patent/DE3781815T2/en not_active Expired - Fee Related
- 1987-02-09 EP EP87400291A patent/EP0235021B1/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4286415A (en) * | 1979-03-12 | 1981-09-01 | Ait Industries, Inc. | Method of edging lenses |
DE2934066A1 (en) * | 1979-08-23 | 1981-04-09 | Gebrüder Hau Maschinenfabrik GmbH & Co, 6050 Offenbach | Disc setting control for grinding or polishing machine - uses motor current and disc diameter to obtain regulating signal compared with reference |
US4499690A (en) * | 1983-03-10 | 1985-02-19 | E. D. Coddington Manufacturing Company | Split stations surface grinding apparatus |
EP0131743A2 (en) * | 1983-06-16 | 1985-01-23 | Pilkington Visioncare, Inc. | Calibration gauge for computer-controlled lens generator or the like |
EP0143468A2 (en) * | 1983-11-29 | 1985-06-05 | Tokyo Kogaku Kikai Kabushiki Kaisha | Edge grinding method and apparatus |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3938332A1 (en) * | 1988-11-22 | 1990-05-23 | Briot Int | Spectacle lens grinding machine - has carriage supporting arm with attached measuring sensor for grinding weight regulation |
US5161333A (en) * | 1989-02-23 | 1992-11-10 | Briot International | Device for recalibrating a machine for grinding ophthalmic glasses |
FR2644718A1 (en) * | 1989-03-23 | 1990-09-28 | Briot Internal | DEVICE FOR RE-CALIBRATING A MACHINE FOR GRINDING OPHTHALMIC GLASSES TO REPAIR THE WEAR OF THE WHEEL |
EP0391757A1 (en) * | 1989-03-23 | 1990-10-10 | Briot International | Device for recalibrating an ophthalmic lens grinding machine for compensating the grinding-wheel abrasion |
EP0444902A2 (en) * | 1990-02-27 | 1991-09-04 | BAUSCH & LOMB INCORPORATED | Lens edging system |
EP0444902A3 (en) * | 1990-02-27 | 1992-04-08 | Bausch & Lomb Incorporated | Lens edging system |
EP0603074A1 (en) * | 1992-12-18 | 1994-06-22 | ESSILOR INTERNATIONAL Compagnie Générale d'Optique | Process for checking the fitting of a lens to be grinded to a spectacle frame on a grinding machine |
FR2699445A1 (en) * | 1992-12-18 | 1994-06-24 | Essilor Int | A method of controlling a grinder to match a spectacle lens with a lens to be grinded. |
US5398460A (en) * | 1992-12-18 | 1995-03-21 | Essilor International Cie Generale D'optique | Method for checking that lenses to be fitted to an eyeglass frame match the contour of the rims or surrounds of the frame |
FR2867409A1 (en) * | 2004-03-09 | 2005-09-16 | Vallon | Circular rotating cutting tool wear out compensating device, has programmable controller to control motor for obtaining constant circumferential speed of tool and to control jack for adjusting downward movement of tool |
EP2505306A1 (en) * | 2011-03-30 | 2012-10-03 | Nidek Co., Ltd. | Eyeglass lens periphery processing apparatus |
US10046434B2 (en) | 2011-03-30 | 2018-08-14 | Nidek Co., Ltd. | Eyeglass lens periphery processing apparatus |
CN113814825A (en) * | 2021-10-19 | 2021-12-21 | 林国武 | New material round edge trimming device and rapid trimming method using same |
Also Published As
Publication number | Publication date |
---|---|
JPH0632892B2 (en) | 1994-05-02 |
DE3781815T2 (en) | 1993-03-25 |
EP0235021B1 (en) | 1992-09-23 |
EP0235021A3 (en) | 1988-02-24 |
JPS62188664A (en) | 1987-08-18 |
DE3781815D1 (en) | 1992-10-29 |
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