Claims
- 1. A machine for beveling lenses by accomplishing a rough grinding stage and beveling stage upon said lens comprising:
- a fixed base,
- a reducing wheel rotatably mounted on said fixed base for accomplishing said reducing stage,
- a beveling wheel rotatably mounted on said fixed base in juxtaposed relation to said reducing wheel for accomplishing said beveling stage,
- means for driving said reducing wheel and said beveling wheel in rotation,
- a carriage mounted on said fixed base, said carriage being laterally movable with respect to said base between a rough grinding position and a beveling position, and being vertically movable with respect to said base between an inoperative position wherein said lens is held spaced from said wheels and an operative position,
- first and second halfshafts mounted coaxially on said carriage for rotation thereon, said halfshafts terminating in first ends in opposed spaced relationship to one another, each of said first ends having lens holding means attached thereto for cooperating together to hold a lens to be beveled, said first halfshaft being adjustably movable axially with respect to said second halfshaft so that a lens can be held clamped between the pair of said lens holding means, said second halfshaft having a template mounted thereon, said halfshafts being so located on said carriage as to hold a lens generally vertically aligned with said grinding wheel and said beveling wheel,
- motor means operatively connected to said halfshafts for selectively rotating said halfshafts,
- first carriage moving means for moving said carriage laterally between said rough grinding position and said beveling position comprising a rotatable first cam having first and second side cam surfaces spaced from one another along the direction of lateral movement of said carriage, and spaced radially from one another on said first cam, said first side cam surface being associated with said rough grinding position and said second side cam surface being associated with said beveling position, said first cam being mounted on a first shaft, an arm pivotally mounted on said carriage and extending across said carriage generally perpendicularly to the direction of lateral movement of said carriage, said arm being movable in a plane generally parallel to said carriage and comprising a follower portion engageable with said first and second side cam surfaces and an end portion terminating in a feeler, first resilient means biasing said arm toward said first and second side cam surfaces, an inclinable guide mounted on said fixed base and engaging said feeler, said guide positioning said feeler laterally with respect to said fixed base, whereby rotation of said first cam causes said carriage to move between said rough grinding position and said beveling position, and motor means operatively connected to said first shaft for rotating said first shaft in synchronized relationship with said halfshafts whereby said halfshafts make at least a portion of one revolution with said follower portion in contact with said first side cam surface and then at least a portion of a revoluation with said follower portion in contact with said second side cam portion,
- second carriage moving means for moving said carriage vertically from said operative position to said inoperative position comprising a raised first peripheral cam surface on the periphery of said first cam, a roller mounted on said base and engageable by said first peripheral cam surface to cause said carriage to move from said operative position to said inoperative position when engaged by said first peripheral surface, whereby when said first cam is rotated to the point where said first peripheral cam surface engages said roller, said carriage is moved to said inoperative position,
- third carriage moving means for moving said carriage from said operative position to said inoperative position comprising a rotatable second cam having a second peripheral cam surface, a lever pivotally mounted on said base and engageable with said second peripheral cam surface, second resilient means biasing said lever into engagement with said second peripheral cam surface, a rocker arm engageable by said lever, a pendulum pivotally attached at one end to said base and having a second feeler means attached to its free end, said second feeler means being engageable with the lower portion of said template, said pendulum being engageable by said rocker arm whereby operation of said lever by said second peripheral cam surface causes said rocker arm to move said pendulum and said second feeler means upwardly to engage said template and thereafter move said carriage upwardly to said inoperative position, and
- switch means for controlling said motor means for driving said halfshafts and said first and second cams, said switch means being mounted on said pendulum and being operated when said feeler means contacts said template to incrementally rotate said halfshafts and said cams.
- 2. The lens beveling machine of claim 1 wherein said second peripheral cam surface is so oriented with respect to said second side cam surface as to operate said third carriage moving means immediately prior to the arrival of said follower at said second side cam surface, whereby said lens is not in engagement with said wheels when said first carriage moving means moves said carriage laterally from said rough grinding position to said beveling position.
- 3. The lens beveling machine of claim 1 wherein said arm is pivotally mounted at one end on said carriage, said feeler is located at the other end thereof, and said follower is located intermediate said ends.
- 4. The lens beveling machine of claim 3 wherein said guide is inclined to a specific angle with respect to the path of vertical movement of said carriage to cause said carriage to move laterally a predetermined amount during each cycle of movement from said inoperative position to said operative position to cause the beveling wheel to be applied to the desired portion of the periphery of the lens.
- 5. The lens beveling machine of claim 1 wherein the position in elevation of the carriage is determined by the contact between the periphery of the wheels or by the template engaging the pendulum, when said peripheral cam surfaces are not in operation.
- 6. The lens beveling machine of claim 1 wherein said switch means comprises a longitudinally movable shaft carrying a movable contact engageable with a fixed contact.
Priority Claims (1)
Number |
Date |
Country |
Kind |
420190 |
Nov 1973 |
ES |
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Parent Case Info
This is a continuation-in-part of application Ser. No. 520,142 filed Nov. 1, 1974, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3745720 |
Savage |
Jul 1973 |
|
3798844 |
Hannaman |
Mar 1974 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
520142 |
Nov 1974 |
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