Patent GB-524502-A (GB)
Title: Improvements in mechanism for feeding work pieces through the hollow spindles of grinding and other machines
IPC: B23Q7/08
Filed: 1939-01-26
Abstract: 524,502. Feeding blanks in grinding-machines. BRYANT CHUCKING GRINDER CO. Jan. 26, 1939, No. 2752. Convention date, Jan. 28, 1938. [Class 60] [Also in Group XXII] In apparatus for feeding blanks through the hollow spindle of a machine such as a grinding- machine the blanks are pushed in succession towards the chuck on the spindle and means in the chuck force the end blank backwards against a positioning stop so that it may be gripped in the correct axial position relatively to the tool. In one form, blanks W, Fig. 1, in the form of cylindrical bushes pass down an inclined shoot 55 on a stationary member 50 and through a slot in the side of a fixed sleeve 20, Fig. 3. A bush 28 is reciprocated within the sleeve 20 by a hydraulic piston 33 and carries fingers 25 sliding in slots in the sleeve and provided with spring tongues 26 for pushing the bushes W forward. Spring tongues 46 on the sleeve 20 prevent rearward movement of the blanks. The bush 28 engages a blank at W<SP>1</SP> and pushes it past the first fingers 46 before receding and the successive blanks are advanced in spaced relation as shown in Fig. 3 by the fingers 26. A chuck-operating sleeve 15, Fig. 4, surrounds the forward part of the sleeve 20 and carries centring members 16 between which a blank is pushed by the end fingers 26, the blank depressing pivoted stops 83 in the chuck body 10 until it has passed them. The sleeve 15 is then drawn backwards to cause jaws 13 secured to a split portion 14 thereof to be closed on the blank by a bevelled collar 11 of the chuck body 10, and simultaneously members 85 pivoted to the sleeve are closed against the action of springs 88 by a bevelled surface 90 on the body. These members carry adjustable spring tongues 86 which are caused to engage the forward end of the blank W" and force it against the stops 83. The chuck sleeve 15 is operated in the closing direction by a spring 71, Figs. 1 and 3, and in the opening direction by a collar 72 secured thereon, a yoke 75 and lever 99 operated by a cam 95. The valve 63 which controls the reciprocating piston 33 by means of pipes 44, 45, is actuated by a cam 65 on the same shaft 66 as the cam 95. Coolant is supplied to the blank in the chuck by a pipe 115, Fig. 1, leading to an annular recess in the stationary member 50, from which it passes along the spindle by grooves 110 in the sleeve 20 to parts 111, Fig. 4, near the chuck. The spindle 1 carrying the chuck body 10 is driven by a pulley 5 and may be stopped quickly by a brake shoe 7. In a modified construction the blanks W, Fig. 12, are fed from the slot 138 in the stationary member 135 carrying the shoot in contiguous relation through a sleeve 130 rotating with the hollow spindle 1, a hydraulically operated plunger 140 engaging each blank as it emerges from the slot 138. Bars 131 are axially slidable in slots in the sleeve 130 and carry at their forward ends spring tongues 145, Fig. 10, projecting through slots 143 in the sleeve to engage the last blank and transfer it to the chuck 148. Members 150 on the chuck body centre the blank and jaws 160 pivoted on the sleeve 130 engage the end of the blank to pull it axially against the pivoted stops 158 which are urged by springs 155 against a locating collar 154. The last but one blank abuts against the rear edges of the stops 158 and tilts them outwardly when the jaws 160 are pushed out of the closing members 164 to eject the finished work piece. The bars 131 are reciprocated by a collar 170 and a camactuated yoke and the chuck-operating sleeve 130 by a collar 180 and a yoke operated by a cam on the same shaft. The valve for controlling the plunger 140 is also cam-operated from the same shaft. In a further modification the chuck 10, Fig. 16, is similar to that shown in Fig. 4, the radially gripping jaws 13 and the axially clamping jaws 86 being carried by the chuck-operating sleeve 15. The bars 25a carrying the tongues 26 are extended at 200 to embrace the last blank W<SP>111</SP> and carry it forward between the centring members 16a on the sleeve 15 and eject the finished work piece, after which the bars are retracted just sufficiently for the last tongues 26<SP>1</SP> to form an end stop, in place of the stops 83, Fig. 4, against which the blank is pressed by the jaws 86. On completion of the machining the bars 250 are withdrawn to allow the tongues 26 to engage behind the next blanks and are then fed forwards again, the cam for controlling the hydraulic valve 63 being designed to give these movements.