Abstract: In a nibbling machine having a fixed tool, a punching tool reciprocated by crank mechanism including a crankshaft and means for feeding a workpiece step-by-step between the fixed tool and the punching tool, feeding movement of the workpiece is controlled by a computer so that the workpiece is stopped while engaged by the punching tool but a maximum period of time is provided during which the workpiece can be moved. A pulse generator connected with the crankshaft generates 1000 to 20,000 pulses per revolution.

Abstract: Apparatus to be utilized as an attachment to hand type power metalworking shears and nibblers for the purpose of performing precision circular metal cutting.

Abstract: An apparatus for controlling the length of movement of a controlled member along a path of repeated operating positions. The apparatus comprises a function generator with an axis digital integrator for each axis of movement of the controlled member and a resultant length of movement digital integrator. All digital integrators have the same input iterate rate. By initially setting the integrand of the resultant length of movement integrator to the square root of the sum of the squares of the initial integrand values of the axis digital integrators of the function generator, the output of the resultant length of movement digital integrator is proportional to the resultant of the distances commanded along the axes by the axis integrators of the function generator. A counter is set to the incremental distance between repeated operating positions and is counted down by the output of the resultant length of movement digital integrator.

Abstract: The nibbler apparatus comprises a quickly changeable rotating cutter having a modified sinusoidal groove of a predetermined width and depth. The rotating cutter is mounted in a die with the modified sinusoidal groove largely enclosed within the die. The modified sinusoidal grooved cutter picks up the material to be cut, carrying it upward into the die opening and there the material is sheared. Flat material can be cut in any direction and the direction of the material being fed into the cutter can be changed at any time.

Abstract: The machine comprises an operating arm accommodated with a pair of horizontally extending shoulders and is rockingly supported by a pin pivoted on parallel vertical supporting standards or uprights for said shoulders and forming part of the machine bedplate. The pin may be vertically moved along slots formed on said standards or uprights. The working plane is horizontal and may be rotated about a vertical axis and with said shoulders forms a cavity. Said plane has attached thereon the several counter-tools for the punching, nibbling and cutting operations and peripherally has cut profiles for rounding off. A mechanism is carried by the horizontal shoulders to cause the rocking movement for said operating arm and relative associated toolholders.

Abstract: A sheet metal cutting attachment for a machine tool of the type including a rotatable chuck driven from a source of power and with the rotatable chuck supported in a bearing structure for rotation around a vertical axis and with the machine tool including a bed portion having a horizontal plane surface spaced from the rotatable chuck, including an elongated body member including a first end formed as a bearing support and a second end formed as a support for a cutting tool and with the body member including means for mounting the body member on the bed portion of the machine tool and with the first end adjacent the rotatable chuck and the second end overhanging the edge of the bed portion, an eccentric drive member including a shaft portion including oppositely disposed ends for rotatable support by the rotatable chuck of the machine tool and the bearing support of the body member end and including an integral eccentric center portion, the cutting tool formed as a concentric sliding punch and die set and with

Abstract: The cutting of masses composed of multiple thickness of expanded foil is accomplished using reciprocating toothed blades that are deeply notched so that the strands of the expanded mesh enter deeply into the notches and are sheared through between the teeth of the blades.

Abstract: A machine, particularly for stamping or nibbling, comprises a reciprocating tool drive having a plurality of tools connected to the drive for selective reciprocation thereof. The drive includes means for stopping at least one of the tools for exchange purposes and a tool-change member is mounted for movement alongside the tool drive and includes a member movable transversely to the reciprocation direction for engaging and removing a tool which is stopped or disconnected from the drive in order to effect an exchange with another tool without stopping the drives of these other tools. The machine also includes means for engaging and moving a workpiece transverse to the reciprocating direction.

Abstract: A numerically controlled nibbling machine including means for controlling the feed rate of the work piece with respect to the work tool of the machine and in which the feed distance or travel of the work piece is limited by a release time in which the work tool is disengaged from the work piece according to a predetermined number of strokes of the work tool per unit of time. The improvement of the invention comprises the provision of means for determining the release time of the work tool in a single stroke of the work tool for any number of strokes of the tool, and means for automatically determining the minimum accelerations and decelerations of the work piece required for travelling the feed distance and for forming a desired feed rate value for the work piece from the determined release time of the work tool and the feeding distance of the work piece per stroke.

Abstract: A punch and die assembly specifically adapted for use as a parting tool is disclosed. The punch has a working tip of rectangular cross section formed with a radius curved convex shear bottom. The punch mates with the die such that the punch side wall to die side wall clearance is maintained or increased at the corners.

Abstract: A workpiece positioning assembly for a machine tool has first and second traverses mounted perpendicular to one another. The second traverse is unsupported at its ends and mounted intermediate its ends upon the first traverse for horizontal movement in a direction perpendicular to the axis of the second traverse. The second traverse has a carriage movable therealong for supporting a workpiece and effecting movement in a direction parallel to the axis of the second traverse. The workpiece positioning assembly is preferably applied to a punch press.

Abstract: A numerically controlled nibbling machine in which the feed distance of a workpiece is limited by a release time during which a work tool is disengaged from the workpiece according to a predetermined number of strokes of the work tool per unit of time. The nibbling machine includes drive means for the work tool, means for controlling the feed rate of the workpiece with respect to the work tool, means for determining the release time in a single stroke of the work tool for every number of strokes of the tool per unit of time, and means for automatically determining minimum acceleration and deceleration of the workpiece required for travelling the feed distance and for forming a desired feed rate value for the workpiece from the release time and the feed distance of the workpiece. The improvement of the invention comprises the means for determining the release time further comprising switch means disposed in the path of the work tool for generating a stop command signal for the drive means for the work tool.

Abstract: A nibbling machine comprises a workpiece support which is driven by separate drive motors in longitudinal and transverse directions to shift the workpiece during the times at which it is not contacted by a punch which is arranged to reciprocate over the workpiece and to contact it and effect the nibbling thereof. A rotary control member is rotated in timed relationship to the means for driving the punch and it is connected to each of the motors for driving the workpiece support in a manner to start and stop these motors when the punch is raised off the workpiece for feeding the workpiece. The rotary member advantageously drives through an eccentric of adjustable magnitude to a fluid piston movable in a cylinder to displace a control fluid selectively to an oil volume dispenser which supplies oil to each of the fluid drive motors for operating the workpiece support in the transverse and longitudinal directions.

Abstract: A method for automatically varying the feed rate of a moving workpiece carriage in the proximity of permissible terminal positions for the carriage in a machine tool. The machine tool includes a numerical control means for controlling the position of the workpiece carriage and means for determining the position of the workpiece carriage in the machine tool. The improvement comprises storing signals corresponding to a plurality of safety positions of the workpiece carriage located within the terminal positions of the carriage in a memory device provided in the numerical control means. The safety position signals are then compared with measured position signals generated by the position determining means which correspond to the position of the workpiece carriage in the machine tool. The feed rate of the workpiece carriage is automatically reduced by the numerical control means when the safety positions are passed by the workpiece carriage as the carriage moves in a direction towards the terminal positions.

Abstract: A stamping or nibbling machine, comprises a workpiece support or means for engaging the workpiece at a spaced location from a punch which reciprocates upwardly and downwardly in respect to a die in order to effect the stamping or nibbling of the workpiece. The support is mounted on a transverse bar which is pivotable about a transverse guide and the guide is carried on a carriage which is pivotable about a longitudinal guide. The workpiece is fed by holding the bar and the carriage against pivotal movement and driving them in the respective longitudinal direction when the punch is lifted off the workpiece. The rate of this feed may be controlled in timed relationship to the movement of the punch so that the feed takes place when the punch is off the workpiece and in a speed of feed which is determined in accordance with the torque acting on the transverse bar and the carriage when they are released for pivotal movement and sensed by associated torque meters.

Abstract: A nibbling tool for contour cutting and for forming holes in a plate or the like, comprising one movable and one stationary member, and a supporting element with a shaft. The shaft has a first longitudinal axis, and the supporting element is rotatable about that axis by a motor, is adjustable in an axial direction, and may be set in a predetermined relationship relative to the stationary member. The movable element has a second longitudinal axis and is rotatable therearound. The axes subtend an acute angle with one another for the movable element to have a predetermined spaced relationship with respect to the supporting element, so that a plate may be inserted between the stationary member and a point of the movable member closest to the stationary member upon the supporting element having been set with respect to the stationary member.

Abstract: Pattern cutting of sheet metal is effected automatically. Conveyors move a metal sheet into a pattern cutting position, the sheet being guided exactly into position. The sheet is clamped securely in pattern cutting position and a cutting tool begins cutting the pattern from the sheet. The cutting tool is movable in x, y, and .alpha. directions so that any type of pattern may be cut thereby. The tool may comprise a scissors-like shearer, one blade being provided above the horizontal sheet being cut, and another blade being disposed below the sheet. Supporting tips are mounted on the conveyor to support the metal sheet in cutting position while preventing damage to the conveyor during cutting. A notcher is also provided movable along each side edge of the metal sheet the notchers being adjustable with respect to each other to accommodate sheets of different widths. The x, y, .alpha., and notcher motors are all controlled by a computer.

Abstract: A device for shifting a workpiece on a nibbling machine which includes a rotary eccentric shaft which is rotatable to move a nibbling punch into and out of association with a workpiece, comprises a workpiece holder which is driven by a first motor in one direction, and a second motor in a direction transverse to this direction. A switch control is connected to each motor and includes means for imparting a programmed control of the operation of the motors which is varied in accordance with a sensing of the thickness of the workpiece being operated upon so that the movement may be accomplished when the nibbling punch is not in contact with the workpiece. The apparatus includes a control switch in the form of a switch lug which is mounted for rotation with the eccentric shaft of the nibbling punch and which cooperates with a contactless switch member to cause a turning on and off thereof.

Abstract: A high speed punching apparatus for cutting parts out of generally flat stock with said apparatus including means for selectively adjusting the tool stripping force to accommodate different materials, means for avoiding possible cutting of an overlaying template, means for minimizing friction between the punching tool and associated die button, means for minimizing hangup of burrs on the work piece in the die button and also a punching tool having means for minimizing friction and for expelling chips cut from the workpiece.

Abstract: A portable housing encloses a source of power which provides rotational motion. Means for converting the rotational motion to a reciprocal motion supports a punch which is reciprocated with respect to the housing along a particular surface of a first die member. A second die member is adapted to be disposed over the punch to form a die channel with the particular surface and to provide a cutting surface against which the sheet metal can be cut by the punch. Stripper means is provided to extend on the opposite side of the sheet metal from the cutting surface to maintain the sheet metal in a substantially contiguous relationship with the cutting surface of the second die member.

Abstract: A hole punching apparatus in which a punch having a center point formed thereon is locked to a punch support by in-line locking pins which can be unlocked to move the punch independently of its support toward the stock to be punched to align the center point of the punch and the location point on the stock, and in which cam means is provided for camming the locking means to release position when the punch is moved toward its original position relative to the punch support, means is provided for automatically restoring the locking pins to locked positions when the punch is restored to its original position and a telescoping connection is provided between the punch and the punch support for maintaining them in alignment when the punch is moved relative to the punch support to bring the center point of the punch into engagement with the stock.

Abstract: A machine tool which is operable on a workpiece, particularly a stamping or nibbling machine, comprises a movable electrically conductive work tool which is connected in a circuit along with a workpiece. The circuit includes a relay having a switch which is closable to energize a control device such as a drive motor for the feed of the workpiece. The relay is controlled by a contact which is effected when the tool contacts the workpiece to energize the relay and, for example, to open the contact in the control circuit, to stop the control operation. The relay advantageously includes a spring to return this contact switch to a closed position.

Abstract: An electric hand nibbling machine having means for connecting a movable blade member with a rotary driving means transmitting a force from said rotary driving means in the axial direction of said movable blade member while allowing rotation of said movable blade member on its axis and having a sufficient clearance between the fixtures of the movable blade member and a confronting fixed blade member for free and exact operation for an angular material to be cut.This invention relates to an electric hand nibbling machine for shearing sheet iron, synthetic resin sheet or the like by nibbling operation, and more particularly to an electric hand nibbling machine appropriately adapted to cut a so-called keystone-plate or deck-plate used as a material for a ceiling or floor.As shown in FIGS. 5A and 5B, one type of nibbling machine effects shearing of a material in a pushing stroke of its movable blade member b which is adapted to move reciprocatively relative to its fixed blade member f (as shown in FIG.