Abstract: An automatic screwdriver is mounted on a coordinately movable slide structure to shift horizontally to various positions above a workpiece and also to shift vertically to drive screws into the workpiece. A stylus which moves with the slide structure coacts with an overhead template to locate the gun in precise preselected driving positions over the workpiece. Jaws hold the screw as the screwdriver is advanced downwardly and are cammed open during driving of the screw. A link stops the jaws a predetermined distance above the workpiece to permit the jaws to open in the event another screw or other obstruction is located closely adjacent the screw being driven.

Abstract: An automatic screwdriver is mounted on a cantilevered support to move horizontally to various positions above a workpiece and also to move vertically to drive screws into the workpiece. A depending handle with a hand grip is used to steer the screwdriver horizontally. Up and down movement of the handle relative to the screwdriver causes a power actuator to shift the screwdriver vertically to drive a screw and to retract the screwdriver preparatory to driving of the next screw. The handle may be selectively pivoted between positions enabling either right-hand or left-hand operation of the handle.

Abstract: The fastener driving tool of an automatic assembly machine is rotated by a two speed transmission which acts in conjunction with two torque-responsive clutches. Initially, the transmission rotates the driving tool at a high speed to effect fast driving of the fastener. After torque of predetermined magnitude has been applied to the fastener, one of the clutches torques out and, at that time, the transmission rotates the driving tool at a greatly reduced speed by way of the other clutch so that the fastener is rotated slowly during final tightening. When final tightening torque of predetermined magnitude is applied to the fastener, the second clutch torques out to stop rotation of the driving tool.

Abstract: Workpieces are supported on pallets which are advanced by a continuously driven power-and-free conveyor adapted to permit each pallet to dwell in a work station when the pallet is stopped in the work station during continued driving of the conveyor. To effect the foregoing, the conveyor includes spaced, spring-loaded clamps which normally grip elongated lips on the pallets in order to advance the pallets. When the pallets are stopped, the clamps slip frictionally along the lips so as to allow the pallets to dwell while driving of the conveyor continues.

Abstract: A tool for tightening an annular clamping band around a hose includes a substantially V-shaped forming punch adapted to be pivoted to an active position by a reciprocating pneumatic actuator. As the punch pivots to its active position, it rams part of the free end portion of the band into a substantially V-shaped throat formed in an anvil. The actuator then shifts the punch and the anvil in a direction applying tension to the band as the band is drawn between and is reshaped by the punch and anvil.

Abstract: A machine for raising parts vertically from a pick-up station, for shifting the parts horizontally toward a delivery station, and for lowering the parts vertically into the delivery station. The machine includes a parts handling head pivotally supported on the lower end portions of a pair of parallel links whose upper end portions are pivotally connected to a vertically movable slide. A crank is oscillated back and forth by a reciprocating actuator and acts to effect pivoting and vertical shifting of the links while a cam follower is connected to one of the links and coacts with a slotted cam plate to control such pivoting and shifting. In one embodiment, reciprocating motion of the actuator is converted into oscillating motion of the crank by a rack and pinion and, in another embodiment, the motion conversion is effected by cogged belts coacting with toothed sprockets.

Abstract: Workpieces are supported on pallets which are advanced by a continuously driven power-and-free conveyor adapted to permit each pallet to dwell in a work station when the pallet is stopped in the work station during continued driving of the conveyor. As each pallet approaches the work station, it is gradually decelerated and cushioned by a swingable stop which, after stopping the pallet, is shifted transversely to lock the pallet rigidly in an accurately fixtured position in the work station. A single pneumatically operated actuator serves to shift the stop transversely from a position in which the stop catches a pallet to a position in which the stop fixtures the pallet and then to a position in which the stop releases the pallet.

Abstract: An automatic assembly machine with a rotatable socket adapted to be advanced downwardly through an active stroke to drive a hex head screw into a workpiece. Screws are supplied one at a time to the socket by a loading mechanism having a pair of jaws adapted to close and open to grip and release a screw. While the jaws are closed, a screw is forcibly blown into the jaws through a pneumatic supply tube. As the socket retracts, the jaws are shifted transversely inwardly toward the socket and move beneath the socket as soon as the socket moves upwardly past the jaws. Thereafter, the jaws are moved upwardly along the same path as the socket but at a speed greater than the speed of the socket to enable the jaws to overtake the socket and place the screw into the socket. When the socket starts its downstroke, the jaws move downwardly away from the socket and are cammed open to release the screw.

Abstract: A gripping mechanism is mounted on a carriage and is adapted to be shifted back and forth along an inverted L-shaped path to pick up and transfer parts. Inverted L-shaped cam tracks are formed in a main support member and receive and guide rollers which support the carriage. The cam tracks and the rollers are arranged to allow the rollers to roll freely without skidding while preventing radial play between the rollers and the tracks. A flexible drive linkage is connected between the carriage and its actuator and is capable of yielding in both directions in order to prevent damage to the actuator if the carriage becomes jammed when the carriage is being either advanced or retracted. Before being picked up by the gripping mechanism, the parts are held in a track by an escapement having spring-biased fingers adapted to move between open and closed positions.

Abstract: Valves are located at opposite ends of a cylinder and are automatically moved toward closed positions at a controlled rate as a piston approaches the ends of the cylinder. Upon being moved toward its closed position, each valve restricts the flow of exhaust air from the respective end of the cylinder and causes the piston to decelerate so as to cushion the piston as it comes to a stop.

Abstract: A gripping mechanism is mounted on a carriage and is adapted to be shifted back and forth along an inverted L-shaped path to pick up and transfer parts. Inverted L-shaped cam tracks are formed in a main support member and receive and guide rollers which support the carriage. The cam tracks and the rollers are arranged to allow the rollers to roll freely without skidding while preventing radial play between the rollers and the tracks. A flexible drive linkage is connected between the carriage and its actuator and is capable of yielding in both directions in order to prevent damage to the actuator if the carriage becomes jammed when the carriage is being either advanced or retracted. Before being picked up by the gripping mechanism, the parts are held in a track by an escapement having spring-biased fingers adapted to move between open and closed positions.

Abstract: A gripping mechanism is mounted on a carriage and is adapted to be shifted back and forth along an inverted L-shaped path to pick up and transfer parts. Inverted L-shaped cam tracks are formed in a main support member and receive and guide rollers which support the carriage. The cam tracks and the rollers are arranged to allow the rollers to roll freely without skidding while preventing radial play between the rollers and the tracks. A flexible drive linkage is connected between the carriage and its actuator and is capable of yielding in both directions in order to prevent damage to the actuator if the carriage becomes jammed when the carriage is being either advanced or retracted. Before being picked up by the gripping mechanism, the parts are held in a track by an escapement having spring-biased fingers adapted to move between open and closed positions.

Abstract: A gripping mechanism having jaws for picking up and releasing parts is carried on an outwardly and inwardly swinging parallel linkage which, in turn, is mounted on an upwardly and downwardly swinging parallel linkage. A spring-loaded snubber takes out play in the linkages to insure precise positioning of the gripping mechanism at the ends of its outward and inward strokes. The jaws of the gripping mechanism are open and closed by a compactly mounted fluid-operated actuator, are connected to one another by an equalizing link which effects automatic self-centering of the jaws, are adapted to rotate the part as the part is transferred, and are adapted to be opened and closed with either a swinging motion or a straight line motion.

Abstract: A precision roller chain with parallel runs and with an even number of links is trained around a sprocket wheel and an idler wheel and is driven around a racetrack-shaped path. To compensate for the inherent tendency of the chain to tighten and loosen in a cyclic manner, the idler wheel is formed with a smooth periphery and has a somewhat smaller diameter than the effective diameter of the sprocket wheel. In addition, compensating ramps hold the chain outwardly away from the idler wheel adjacent the tangency points of the idler wheel and keep the chain tight when the rollers of the chain are in angular positions which otherwise would cause the chain to inherently loosen.

Abstract: A mechanism for unloading a part which is retracted upwardly with a tool and which remains on the tool as the latter begins its downward stroke. The mechanism includes a tray which initially is moved into position to remove the part from the tool as the tool starts through its downward stroke. After removing the part, the tray catches the part and then shifts clear of the downwardly moving tool and discharges the part.

Abstract: A transfer finger for feeding small workpieces is pivotally mounted at the forward end of a rod which is adapted to be advanced and retracted by a reciprocating pneumatic actuator. During the initial portions of the advance and retract strokes of the actuator, one or more radially contractible collects frictionally grip the rod and prevent the rod from advancing and retracting the finger until such time as the actuator has pivoted the finger between active and inactive positions.

Abstract: Randomly oriented screws are deposited onto two horizontally spaced endless belts and are advanced toward a track located adjacent the ends of the upper runs of the belts. As the screws are advanced, the belts are vibrated vertically to shake the screws to properly oriented positions in which the screws hang by their necks from the belts with their shanks located between the belts. Vibration of the belts is effected by means of lugs formed on the inner sides of the belts and operable to flex the belts upwardly and downwardly as the lugs pass across pulleys which support and guide the belts. Also disclosed is a clearing wheel for flinging any improperly oriented fasteners from the track, the clearing wheel being constructed from a series of face-to-face discs made of comparatively soft urethane or the like.

Abstract: Threaded fasteners in a hopper are picked up by buckets spaced angularly within a rotatable, open sided drum and are dumped out of the buckets at a position above the hopper. Each bucket is generally L-shaped and is formed by two elements, one of the elements being selectively adjustable relative to the other element to enable the effective volume of the bucket to be changed.

Abstract: A screw is blown through a flexible tube and into the jaws of a transfer hanism which is associated with a hand-held screw driving gun. Thereafter, the jaws are advanced to deliver the screw into telescoping relation with a retractible tubular finder which surrounds the driving bit of the gun, the jaws holding the screw during initial driving of the screw and then returning to receive another screw from the tube.

Abstract: A pick and place machine having jaws which pick up a part at a loading ston and shift first horizontally and then vertically to place the part at a delivery station prior to releasing the part. By making a simple modification, the machine may be adapted to cause the jaws to move first vertically and then horizontally after picking up the part. In addition, the machine may be adapted to change the orientation of the part during its transfer between the stations and to deliver the part along paths of various shapes.