GB738113A - Machine tool of the drill press type having multiple rotary tools - Google Patents

Abstract

738,113. Operating clutches; ratchet gearing. BURG, F. G. Aug. 14, 1953, No. 22525/53. Classes 80 (2) and 80 (3). [Also in Group XXII] A machine tool comprises a number of rotatable tool holders 24 spaced around a head 7, a coupling member 37 connected to each holder, means 121 for angularly adjusting the head to position the holders successively into position and to position each coupling member coaxially opposite a driving member 39 with which it may be engaged, and means 84 for moving the head to and from the work. The machine further comprises a power - driven actuator mechanism for intermittently supplying power to the head adjusting means 121, the mechanism comprising a restraining member 160 normally maintaining the mechanism inoperative, an element 166 movable with the head to engage an abutment 170 when the head is moved upwardly to an initial position, and means actuated by such engagement for rendering the restraining member ineffective and causing the mechanism to operate.. The driving member 39 is rotated from a motor 78 driving a shaft 56 which moves with the head-slide 9. At the upper end of a withdrawal movement of the slide 9 increased forced has to be exerted by the operator to overcome a spring resistance. The lever 170 then engages and depresses the lever 166 to withdraw the pin 160 and allow a plunger 154 to engage a recess in a worm-wheel 145. A shaft 97 is thus clutched to the worm-wheel 145 which is rotated continuously by the shaft 41 which carries the coupling member 39. A worm 111 on the shaft 97 then rotates a shaft 113 carrying a crank 115 actuating a pawl lever 116 to engage the pawl 119 with, and index, the wheel 121 which adjusts the head angularly, the lever being moved away from the wheel 121 by a cam 127 at the end of the indexing movement. During this movement, cams 99, 100 on the shaft 97 remove an indexing bolt 89 from the turret and move a yoke 92 axially to withdraw the driving clutch 39 from the engaged coupling member 37. Furthermore, an arm 177 rotated with the shaft 113 releases the lever 170 to allow the plunger 160 to re-engage and withdraw the plunger 154 and also releases a plunger 149 which engages a recess in the sleeve 142 carrying the plunger 154 to stop it after one complete revolution.