Tool changer for vertical boring machine

A carousel assembly for holding a plurality of tool blocks, where the blocks are formed with upwardly opening clamping slots extending from side to side, which comprises

• (a) a rotatable turntable,
• (b) turntable support means for rotatably supporting said turntable,
• (c) said turntable having a plurality of radially projecting tool block supporting elements, each adapted for slidable reception in the clamping slot of a tool block,
• (d) a tool block pick-up position associated with said turntable support means whereby said turntable may be rotated to selectively position a predetermined tool block supporting element at the pick-up position,
• (e) recess means in tool block supporting elements accommodating the simultaneous presence in said clamping slots of said supporting elements and other tool block engaging means for engaging and transporting a tool block from said turntable,
• (f) each tool block supporting element having locking means associated therewith and an operating element extending along the supporting element and through the recess means in the tool block, for actuating said locking means,
• (g) said locking means, when actuated to an effective position, preventing radially outward movement of a tool block,
• (h) said operating element being a rotatable rod, and
• (i) cam means being provided on the turntable support means for automatically rotating said rod and actuating said locking means to an effective position when the tool block supporting element associated with said rod is advanced away from the tool block pick-up position by rotation of said turntable.

In a tool storage carousel assembly including a rotatable turntable storing a plurality of tool blocks and a tool transfer position, means for controllably decelerating and stopping said turntable to position a predetermined one of the tool blocks at said tool transfer position which comprises,

• (a) an hydraulic motor for rotating said turntable,
• (b) first and second sets of indexing projections associated with said turntable and movable therewith through predetermined paths of travel,
• (c) a switch actuating plunger associated with said carousel assembly and selectively movable into said predetermined path of travel for the first set of indexing projections,
• (d) a stop bar associated with said carousel assembly and selectively movable into said predetermined path of travel for the second set of indexing projections,
• (e) tool block detecting means operable to detect the approach of said one predetermined tool block to said tool transfer position,
• (f) said tool block detecting means being further operable upon sensing the approach of said one predetermined tool block to said tool transfer position to move said switch actuating plunger and said stop bar into the paths of travel of said first and second sets of indexing projections, respectively,
• (g) said sets of indexing projections and said stop bar and switch actuating plungers being arranged and configured whereby one of said first indexing projections engages and activates said moved actuating plunger to decelerate the turntable as the one predetermined tool block approaches the tool transfer position and one of the second indexing projections engages said stop bar to stop the turntable when the one predetermined tool block is positioned adjacent said tool transfer position, and
• (h) means to stall said hydraulic motor while maintaining the motor in an energized condition when the turntable has been stopped.

In a tool storage carousel assembly including a rotatable turntable storing a plurality of tool blocks and a tool transfer position, means for controllably decelerating and stopping said turntable to position a predetermined one of said tool blocks at said tool transfer position, which comprises

• (a) a hydraulic motor for rotating said turntable,
• (b) tool block detecting means operable to detect the approach of said one predetermined tool block to said tool transfer position,
• (c) said tool block detecting means including decelerating switch means operable upon the sensing of the approach of said one predetermined tool block to said tool transfer position to decelerate the turntable,
• (d) abutment stop means controllably movable into a stop position with respect to said turntable and operative to stop said turntable when said one predetermined tool block is positioned adjacent said tool transfer position, and
• (e) means to stall said hydraulic motor while maintaining the motor in an energized condition when the turntable has been stopped.