Abstract: New and old tools are changed by loosening or fastening a chuck mounted on a main spindle gripping or releasing the new and old tools and rotating and indexing a tool storage magazine in which a multiplicity of tools are stored, without requiring an exclusively usable driving means.

Abstract: Methods and apparatus by which a member is moved automatically to any one of a plurality of predetermined positions each of which is precisely established by guiding lock-up means such as a shot pin, and characterized in that inaccuracy of a feedback signal representing actual position of the member is determined prior to each movement toward a different position to create a correction signal used during subsequent repositioning so that the lock-up means will engage when such different position is reached.

Abstract: A device for changing bore crowns on a drill rod including a bore crown magazine member and means for automatically stopping and locking the magazine member in a desired rotated position.

Abstract: A machine tool having automatic tool changing apparatus including a tool storage magazine formed with a plurality of circumferentially spaced socket recesses each having a generally U-shaped tool support shoe that is adapted to be broken away from the magazine to prevent damage to the tool changing apparatus in the event of unintended overtravel of the tool transfer mechanism at the magazine during a tool change operation. Limit switch means are provided for interrupting the feed drive of the machine in the event of such unintended overtravel of the tool transfer mechanism.

Abstract: Tool changing apparatus for a multi-axis manipulator for selectively receiving and holding one of at least two different work tools. Each of the work tools is mounted on an upstanding table and is provided with a substantially vertical plate and a substantially horizontal plate. A support assembly is provided on the manipulator that is adapted to be locked to the vertical plate on one of the work tools for performing a programmed work cycle after which the work tool is returned and deposited on the upstanding table under program control and the manipulator is then locked to the vertical plate of the other work tool for performing additional operations.

Abstract: A machining center having an endless track with movable tool heads, and one or more machining stations at which the tool heads may be successively stopped. Each station has means for driving the tool head and a workpiece saddle which may be advanced during the machining operation. The arrangement has high flexibility for automatically machining different types of workpieces and may be adapted to varying production requirements without unnecessary equipment.

Abstract: This invention relates to a head-stock for a milling and boring machine, comprising a body in which a boring spindle and a milling sleeve or spindle arranged around the boring spindle are mounted to rotate, wherein a tubular member is mounted to rotate around the milling sleeve or spindle to which tubular member is secured a ring which is of large diameter and which is situated in the front face of the body, said ring being capable of being connected selectively to means for driving it round at high speed for machining purposes and to means for driving it round at slow speed for indexing purposes.

Abstract: A horizontal boring mill and milling device with a tool carrier adjustable as to height on a horizontally displaceable stand and with a tool magazine arranged laterally thereof, in which the tools or set of tools are held parallel to the boring or milling spindle axis. The tool magazine or frame is, for purposes of exchanging heavy tools or set of tools, arranged in front and in the region of movement of the tool carrier, and the tools or set of tools have flange-shaped extensions, or the like, for holding in the tool magazine and on the tool carrier.

Abstract: There is disclosed a spindle unit for machine tools in which there is a spring operated drawbar in the spindle having finger hooks for engaging the adapter of a toolholder for drawing the latter into a tapered socket at the nose of the spindle with means for locking the finger hooks in engagement with the toolholder adapter and automatically operated means for relieving the pressure of the hooks against the toolholder adapter and providing push rod means to cause the finger hooks to move clear of the adapter and apply a force to the toolholder so that the latter, with the tool carried thereby, may be removed from the spindle socket. The spindle is advanced toward the work and retracted therefrom by a tubular quill provided with a helical groove to cooperate with a ball-nut means formed integrally with a pulley which is connected by a timing belt driven by a pulley on the shaft of a stepper motor, the advancement of the spindle depending on the number of step-like movements of the motor.

Abstract: A tool holder for machine tools particularly adapted for use in turret structures having a plurality of retainers for holding a plurality of such tool holders each carrying a different tool such as a drill, tap, reamer or other metal working tool. The disclosure relates to a mechanically actuated tool holder having mechanical locking means adapted to snap into annular retainers in a turret structure of a mechanical tool and wherein locking means alternately is operable to hold the tool holder in the turret retainer ring and to lock the tool holder onto an annular ledge of a stub means carried by a rotatable and reciprocable machine tool driving spindle.

Abstract: This invention provides a drill changing device for a drilling machine in which a collar is provided on the shank of a drill at a predetermined location relative to the tip of the drill, the collar being frictionally gripped by a split sleeve so that the shank projects outwardly from the sleeve, the sleeve being slidable relative to a fixed support and normally biased against a shoulder on the support, allowing overtravel when the collet of a drilling machine engages the collar and receives the shank. The tip of the drill is at a predetermined position relative to the collet when the collet engages the collar so that the drill will effect proper penetration of the workpiece in a drilling operation.

Abstract: A tool clamping device for multiple-operation machines or machining centers. The device has a self-blocking fork for selectively securing a tool on a tool changing device or autooperator, the fork being in the shape of jaws which partially embrace the shank of a tool. In both arms of the fork there are profile grooves in which there are located pivotally mounted blocking pins. Between the blocking pins and the bottom wall of the grooves there are springs for constantly pressing the blocking pins toward their blocking position. The blocking pins are L-shaped, and in their blocking position the end of one arm of each protrudes outwardly in position to be engaged by the face keys of the spindle of the machine in the operation of removing a tool from the spindle of the machine.

Abstract: A heavy machine tool, especially drilling and milling machine, which has a head stock with a supporting sleeve therein for receiving a boring spindle and a pull rod operable chucking device for chucking a tool head, and which also includes a device for depositing tool heads and placing the same in readiness for use.