| 摘要 |
854,486. Drilling-machines. ALLEMANN A.G., H. Feb. 25, 1957 [Feb. 25, 1956], No. 6320/57. Class 83 (3). A single or multi-spindle drilling-machine comprises a feed-stop 9 associated with the face of the work 16, such that the feed-motion is stopped when the drill &c. 2 has penetrated a predetermined distance beyond the face. The stop-sleeve 9 has an end-cap 12 with pins 11 to pass through a work-holding- and stripping-foot 17 and locate the work, and with a projection 13 to engage the face of the work and arrest movement of the sleeve relatively to the work. Further feed of the drill-supporting frame 5 or of the work-table 26 during cutting, slides the stopsleeve further over the spindle-sleeve 3, against the influence of a spring 10, until the feed is stopped by engagement between the stop-sleeve and a sleeve-nut 18 adjustable on the spindle sleeve 3 and locked by a nut 19. In the inoperative position, the stop-sleeve 6 is supported by the engagement of its flange 9<1> and a collar 14 supported from the frame 5 by a sleeve 24, which also slidably supports an insulating bush 21 carrying a contact 22 connected to an electric pulse-transmitter (not shown), which stops the feed if the work is incorrectly positioned. With the drill 2 adjacent the work and the latter correctly positioned in relation to a work-holder 25 and on the locating-pins 11, as shown, the contact 22 is not in engagement with the flange 9<1>. If the stop-sleeve 9 cannot descend to its proper position, however, due to cuttings lying on the work &c., the contact 22 is engaged by the flange 9<1> and transmits a pulse to stop the machine. Spindle-mountings.-The spindle-sleeve 3 is supported by a collar 7 on which bears a sleevenut 4 on the sleeve 3, the support permitting limited pivotal movement of the spindle assembly to facilitate engagement of the pins 11 in location-holes in the work. A grub-screw 29 secures the collar 7, which is prevented from rotating relatively to the sleeve 3 by a screw 30. A spring 6 forces the nut 4 against the collar 7. |
