Abstract: A deflection compensation structure for a press brake having a frame, a bed on the frame, a ram on the frame, and an elongated die on the bed, the press brake deflection compensation structure including a housing for attachment to the bed of the press brake, the housing including an elongated bottom plate, a lower elongated wedge member mounted on the elongated plate, an upper elongated wedge member mounted on the lower wedge member, the upper and lower wedge members having mating inclined surfaces, the lower wedge member having a wide edge and a narrow edge, an elongated slot running lengthwise of the wide edge, a plurality of spaced slots extending inwardly from the wide edge and intersecting the elongated slot, an elongated rod in the elongated slot, a first rigid attachment between the elongated rod at one end of the lower wedge member, and a second movable attachment connected to the other end of the elongated rod for effectively lengthening and shortening the elongated rod to thereby cause the lower wed

Abstract: A barrier guard for a machine having a machine surface including a grille having a plurality of horizontal bars, a plurality of links having first ends pivotally mounting the grille and second ends pivotally mounted on the machine, brackets mounted on the machine, slots in the brackets, roller followers mounted on the grille and located in the slots for guiding movement of the grille in a predetermined path as it is caused to pivot relative to the links, a base bar on the grille for providing progressively greater clearances from the machine surface as the grille moves in a predetermined direction, and detents for retaining the grille in a plurality of adjusted positions.

Abstract: A barrier guard for a machine having a machine surface including spaced brackets mounted on the machine, spaced elongated links pivotally mounted on the spaced brackets, a grille mounted for sliding movement in first slots in the elongated links, second slots in the brackets, followers attached to the grille and located in the second slots to cause the grille to move rectilinearly in the first slots when the elongated links are caused to pivot, and a base bar on the grille for providing progressively greater clearances from the machine surface when the base bar moves in a predetermined direction.

Abstract: A clamp construction for mounting an elongated punch on a ram of a press including a plurality of rocker arms pivotally mounted on the ram, a plurality of spring units bearing against upper ends of the rocker arms, a movable jaw on the ram in opposition to a fixed jaw, the lower ends of the rocker arms pressing the movable jaw toward the fixed jaw to hold a punch therebetween, and a plurality of hydraulic motor units spacedly mounted lengthwise on the ram for counteracting the force exerted by the rocker arms on the movable jaw to thereby effect the release of the punch held between the fixed and movable jaws.

Abstract: Apparatus which measures loads imposed on load carrying members, and particularly such members in presses, to indicate the peak load reached during a press cycle, has circuits for amplifying the electrical signal from a sensing device such as a strain gage bridge, a peak detector which provides an output representing the peak load, and a digital indicator. Zero setting is achieved by integrating and holding an offset voltage derived by an integrating circuit in negative feedback relationship with the circuit which amplifies the signals from the sensing device. Calibration of the apparatus for press factor is obtained by adjusting the gain of a variable gain stage in the amplifier. The peak detector is reset each press cycle when the load sensed bears a predetermined ratio to rated or full capacity load.

Abstract: An overload control for a mechanical press wherein excess hydraulic pressure generated by the mechanical overload of the press is applied to a transducer which develops an electrical signal which in turn is applied to a circuit which is responsive to the magnitude of the electrical signal and to the time increment during which the magnitude of the electrical signal is developed and applied to the circuit. The circuit includes a timing and reference portion comprising a voltage divider network and an RC network, and the circuit also includes a differential amplifier responsive to a difference in magnitude between the transducer signal and a signal from the timing and reference portion. As a result, when the instantaneous signal from the transducer increases suddenly due to an actual overload on the press, the circuit responds and operates a relay to cause stoppage of the press.

Abstract: A mechanically driven power press has vertical slide mechanism adapted to engage and reciprocate the upper movable element of a die set. Means for adjusting the shut height of said slide including a cylinder secured to said slide and a piston slidable therein and having threaded connection with a portion of said cylinder for shut height adjustment. An hydraulic chamber operable to effect working strokes of said slide. The shut height adjustment has a second threaded portion whereby when said first cylinder is pressurized the threaded parts in engagement with the threaded portion of the piston are forced apart to eliminate thread clearance and lock the shut height adjustment.

Abstract: The invention relates to hydraulically powered shears for metal sheets and plates and particularly to an improvement in the means for adjusting and controlling the rake angle or slope of the movable shear knife in such machines. In the present disclosure a rod member is pivoted at one end and normally is disposed along a line parallel to the direction of reciprocation of the ram of the shear. The upright member has a cable connection with a servo valve which controls the fluid circuitry of the shear to adjust the relative positions of the hydraulic motor means at opposite sides of the ram to change the inclination of the ram.When the rod member is in normal position the servo valve is blocked and the rake angle is maintained but when the rod member is adjusted angularly in either direction it operates through the cable means to adjust the servo valve in one direction or the other to change the relative vertical positions of the motor means.

Abstract: Single revolution clutch mechanisms are conventionally employed in machines such as punch presses and the like. Such clutches are usually provided with single stroke mechanisms so that an operator must release the "RUN" buttons before a subsequent cycle can be initiated. The present invention shows apparatus which prevents the initiation of a subsequent cycle of operation whenever the single stroke mechanism comes into operation. A latch is released upon such operation of the single stroke mechanism which prevents operation of the cycle-initiating means by the operator and requires the services of a maintenance man at the clutch mechanism to restore the clutch-iniatiating and single stroke mechanism to operating condition.

Abstract: Apparatus for performing a plurality of switching operations in response to input rotary motion. An input shaft rotatably positioned in a housing has a plurality of cams axially positioned therealong, and a corresponding plurality of cam-operated electrical switches are positioned along the shaft, each switch being fixed to a corresponding carrier element movably connected to the housing. A motion transmitting means in the form of a shaft having a worm fixed thereon operatively engages a carrier element, in particular a series of teeth on the element, for moving the element to move the switch carried thereby in a manner adjusting the rotational orientation of the switch relative to the corresponding cam. An identical arrangement can be provided for each switch to allow independent adjustment, or the switch carriers can be connected together for simultaneous adjustment.