| 摘要 |
937,384. Copy-milling. E. MINGANTI. Jan. 16, 1961 [Feb. 4, 1960], No. 1670/61. Class 83 (3). Means for cutting notches in keys comprises a cutter 9 and drive means 5 on a base-plate 4 reciprocated to cause the cutter to rise and fall according to the shape of a template, the key and template being clamped by the operation of a single lever. The motor 5 and the base-plate 4 are carried on a carriage 3 by pivots 6. The motor drives, at one end, the cutter and, at the other, worm gearing to rotate a shaft 11 carrying cranks 13. The cranks are connected by links 15 to a base 1 so that, as the cranks rotate, the motor carriage 3 is reciprocated along rods 2. Movement of a follower 55 carried on a yoke 19 pivoted at 24 to the carriage 3 causes rocking movement of the base-plate 4 through links 20. The follower is adjustable vertically by a screw 60 to adjust the depth of cut. In operation, the cutter is moved axially along the key when a push-button is pressed and after a single stroke to left or right a cam 25 on the shaft 11 actuates a switch to stop the motor. To allow access to the key, the cutter is swung up away from the key, so that its axis lies on a line B-B, by a toggle 31, 30 straightened by an adjustable abutment 35 as the base-plate 4 completes a movement to the left. The key blank is held between jaws 37, 38, Fig. 7, engaging the grooves in the blank and the template is held between jaws 39, 40. Rotation of a handle 46 withdraws the jaws 37, 39 against the force of springs 42, 43. If the handle 46 is moved only by a small amount, a lever 48 connected to the lower jaw is not moved and the template remains clamped. Displaceable abutments 50, 51 above the key engage a shoulder on the blank to ensure correct positioning. |
