Abstract: A mass-balancing arrangement comprises an adjustably pre-loaded spring member (14); a pivotably mounted lever (16; 31) for compensating different inertial forces in combination with the spring member (14); a first drawing member (24) connecting a movable mass to the lever (16); a second drawing member (17) connecting the spring member (14) to the lever (16); and a first roller (15) for deflecting the first drawing member (24). The lever (16; 31) has an upper lever arm (19; 32) and a lower lever arm (20; 33), one being sector-shaped and the other cam-shaped. The upper lever arm is connected to the movable mass through the first drawing member (24), and the lower lever arm is connected to the spring (14) through the second drawing member (24). Two torques produced at the upper and lower lever arms are kept balanced. The balanced mass may be an object carriage of a microtome.

Abstract: A separating device for cutting off individual containers (12) from a frame network made of a plastic material, particularly of polypropylene, has at least one punching device at least partially separating the containers (12) from a waste frame. Because the punching device can be moved by a ball screw drive (46) that can be driven by a drive unit, particularly in the form of an eclectic motor (48), along a punching axis (44) from a starting position to a punching position and back again, the separation can be done at high speed, determined by the screw shaft that can be driven by the electric motor.

Abstract: In an unbalance torque compensating device, the supporting member has an engagement surface that receives, through the engaging portion, a first rotary torque T1 applied to the rotating shaft. The urging member causes a second rotary torque T2 in a direction opposite to the first rotary torque T1 to be generated at the rotating shaft through the engaging portion.

Abstract: A power tool comprises a crank pin that is eccentrically rotatable by a motor about a rotational axis. A non-rotatable first slider is linearly reciprocated by the crank pin so as to linearly reciprocate a tool. An eccentric pin is disposed substantially diametrically opposite of the crank pin relative to the rotational axis and is eccentrically rotatable by the motor about the rotational axis. A non-rotatable second slider is linearly reciprocated by the eccentric pin in a substantially opposite phase from the first slider so that the second slider acts as a counterweight to the first slider in order to reduce vibrations at least in the direction of linear reciprocation. A rotatable component is rotatably driven by the motor about the rotational axis and has a center of gravity displaced from its rotational axis towards the eccentric pin so as to supplement the vibration reducing function of the counterweight.

Abstract: The present invention provides a technique for achieving weight reduction of the counter weight while reducing vibration in a reciprocating power tool. A tool bit performs a predetermined operation by reciprocating. A slider reciprocates to drive the tool bit. A motion converting mechanism converts a rotating output of the motor into a reciprocating movement of the slider. A counter weight reciprocates in a direction opposite to the reciprocating direction of the slider to reduce vibration caused by the reciprocating movement of the slider. A component part includes component of motion in a direction parallel to the reciprocating movement of the slider to cooperate with the counter weight in reducing vibration caused within the power tool. Thus, the weight of the counter weight can be decreased.

Abstract: The invention concerns a multistage press, at which within the machine-mounted clamping plate (1), an insert (3) is arranged which can alternatingly be moved in the direction towards the press plunger (2) and away from it. The insert (3) is moved up and down by a cam drive actuated by the press main drive with lifting and lowering cams (5), whose cam tracks (8a, 8b) are traced by lifting rollers (6) and lowering rollers (7) under compressive prestress. Such a multistage press can be operated with a high number of strokes per minute and has, at the same time, an excellent precision of the stroke movement.

Abstract: A vibration damping device is described that dampens vibration produced during the conversion of rotational motion into reciprocal motion. The damping is performed using a simple structure wherein first and second conversion mechanisms are symmetrically arranged with respect to a plane of symmetry, first and second rotating shafts rotate opposite to each other at a constant speed, and the rotational motion is converted into reciprocal motion. The total of mass acting on gravity centers of a first balancer and a second balancer is approximately equal to the total of mass reciprocally driven by a first driving shaft and a second driving shaft. Both gravity centers are positioned 180 degrees to the first driving shaft and second driving shaft across the axes of the first rotating shaft and second rotating shaft. As a consequence, the forces in the direction of an axis can be balanced suppressing vibration.

Abstract: A thermoforming trim press is provided with a frame, a punch plate, a die plate, and a bushing. The frame has a guide post including a tapered outer surface with increasing cross-sectional dimension toward a closing position. The punch plate has a male cutting die. The die plate has a female cutting die configured to scissor in intermeshing relation with the male cutting die. The bushing has a tapered inner surface complementary and reverse to the tapered outer surface of the guide post. The bushing is adjustable in cross-sectional dimension and is configured to guide one of the punch plate and the die plate for axial reciprocation along the guide post. A method is also provided.

Abstract: A press, especially a precision cutting press, for producing precision cut parts from a metal strip or a preform by means of a tool, which is fixed to a top tool clamping plate and a bottom tool clamping plate, wherein a tappet is allocated to one of the tool clamping plates. The tappet is supported against an element fixed to the machine by means of at least one tappet drive piston unit, which is fixedly connected to an opposite element that is also fixed to the machine by means of at least two guide columns, the other tool clamping plate being disposed in said element, whereby the tappet can be displaced along the guide column.

Abstract: An advancing power saw used for any metal cutting application. The power saw is provided with an oscillating mechanism that drives the saw up and down in a vertical direction. A hydraulic cylinder advances the saw toward the metal being cut while the saw is oscillating creating a circular pathway for the saw blade during the cutting operation. A balancing apparatus is provided in association with the saw blade that advances in an opposite direction to that of the saw blade to act as a counterbalance for the saw. The balancing apparatus has a weight provided at one end which dampens the vibrations created by the saw during the cutting operation and substantially equalizes pressure on the saw blade.

Abstract: A slide drive device for a press drives a slide without employing a horizontal slide guide mechanism. Connecting rods move in a linear-type motion level with a balanced crank shaft to minimize vibration. A dynamic balance mechanism further reduces vibration and a slide height adjustment mechanism enables simple top and bottom dead center slide adjustment from a central location. The connecting rods transmit force from the crank shaft to upper links, and through middle and lower links to the slide. A fixed fulcrum pin on the upper link is vertically aligned with a slider pin on the middle link. A center fulcrum pin connects the upper and middle links at a fixed relationship. The slide drive device provides a lower slide speed for increased force adjacent the bottom dead center position and higher slide speed adjacent the top dead center position for speedier return.

Abstract: Disclosed is an automatically equalizing press for sequential operations on opposite sides of a workpiece. The press is designed to allow a pair of punch-anvil combinations to work on opposing sides of the workpiece without substantially deforming the workpiece prior to the final, e.g. piercing, operation. One tool from each combination is mounted on a slide block which is capable of movement independent of the other slide block. The slide blocks are operable by fluid actuated pistons.

Abstract: A plurality of hydrostatic bearing pads are each integrally formed in a respective pin or journal member being used within a mechanical press machine. The hydrostatic bearing pads are supplied with pressurized fluid sufficient to create a combined hydrostatic and hydrodynamic effect between the opposed bearing surfaces of the pin and an associated bushing. The hydrostatic bearing pads are used in conjunction with rotational and oscillating bearings in which relatively little rotation, oscillation, or slow rotational speeds exist or where it is desired to minimize the effects of hydrodynamic action which creates bearing “lift off” on journal bearings. These types of bearings are particularly associated with crankshaft and connection journal bearings, connection pins, and pivot pins used by a rocker-type coupling assembly that couples a weight assembly to the press machine piston or slide assembly or drive assembly.

Abstract: A form, loop and trim system is provided with a toggle mechanism for dynamic counterbalancing. The system operates at high speed with reduced vibration. The system may be conveniently adjusted to handle products of different sizes, shapes and materials. An improved feed apparatus for indexing a sheet of thermoformed articles is also disclosed.

Abstract: A guide system for a dynamic balancer for use in a mechanical press. This system includes a dynamic balancer weight which reciprocates along a longitudinal axis and guiding means for preventing rotation of the balancer weight about the balancer weights reciprocal pathway longitudinal axis. In one particular embodiment, the system includes a guide post attached to the balancer weight and a "U"-shaped weight guide circumferentially located about the guide post whereby preventing rotational movement of the balancer weight around the guide post.

Abstract: In accordance with one aspect of this invention an improved trim press is taught for use in separating molded articles from a web of material. The trim press includes a frame, a drive motor carried by the frame, a first platen carried by the frame, and a second platen carried by the frame and configured to be moved in reciprocation relative to the first platen. A first flywheel assembly is provided on the trim press having a weight with an eccentric mass, the weight being driven in rotation by the motor and coupled to drive the second platen via at least one kinematic linkage. The trim press also includes a second flywheel assembly having a weight with an eccentric mass, the weight being driven in rotation by the motor and coupled to drive the second platen via at least one kinematic linkage.

Abstract: A penetrating tool system for providing a penetration action in a workpiece. The system including a penetrating element and a basic displacement element for establishing a basic displacement between the workpiece and the penetrating element during which basic displacement the penetrating action is provided. An auxiliary displacement element for imparting to the penetrating element an auxiliary reciprocating displacement superimposed on the basic displacement during the penetration action. The auxiliary reciprocating displacement has a frequency and amplitude which are substantially invariant in time, independent of reactions of the workpiece to penetration, the frequency of the auxiliary reciprocating displacement being substantially greater than a frequency of the basic displacement.

Abstract: A device for punching holes in a bicycle rim includes a flange extending radially from a base, the flange having a plurality of rails disposed thereon each for a puncher slidably disposed thereon. Each of the punchers has a first block and a second block respectively extending upwardly from two ends thereof and a cylinder disposed longitudinally to each of the first blocks having a shaft retractably extending therefrom which extends through the first block and has a pin member disposed on a free end thereof. Each of the second blocks has a longitudinal hole defined therethrough so that when a bicycle rim is disposed between the first blocks and the second blocks each of the pin members punches a hole through the rim.

Abstract: A rotary microtome includes a crank mechanism for moving an object carriage up and down in a vertical path and a drive mechanism for driving the crank mechanism. The object carriage has a receptacle for a specimen holder. A mass-balancer balances the moveable masses of the microtome. The mass-balancer has a pretensioned, adjustable spring element and a pivotably mounted lever for compensating different inertial forces of the microtome in combination with the spring element. A drawing element connects the lever to the object carriage. The mass-balancer is indirectly connected to the drive mechanism by the drawing element.

Abstract: A perforated substrate having half of the perforations formed from one major surface of the substrate and the other half formed from the opposite major surface, the two major surface being coplanar is described. This introduces equal and opposite stress forces into the substrate which essentially cancel each other and provide a product meeting exacting planarity requirements.

Abstract: Apparatus for cutting a web, including a frame ((70, 186); a crank (188) mounted for rotation on the frame; an upper platen (210); a pair of linear guides (212) for the upper platen; a first crank arm (196) connected between the upper platen and the crank; a lower platen; second and third crank arms (218, 220) connected between the lower platen and the crank; an upper die shoe (262) mounted to the upper platen; a lower die shoe (260) mounted to the lower platen; a pair of linear guides (264) between the die shoes; and a system (287-290, 298-300) for rotating the crank.

Abstract: The eccentric shaft is connected via the connecting rod and slider to single arm levers projecting at both sides away from the slider. At their ends remote from the slider the levers are supported via threaded spindles at the frame of the punch press. Groups of link members are pivotally mounted to the levers. These groups of link members are connected to double lever pairs arranged symmetrically relative to the center line of the frame of the press. Every double lever is pivotally mounted to a pressing column. The pressing columns of a respective pair of double levers are mounted to a relative ram. Each ram is guided by three guide columns, of which two are rigidly connected to a ram and one to the frame of the press. By the symmetrical dividing of the driving structures and the two rams derived therefrom the punch press is given an extremely long space for mounting the tools without that the height of the punch press, the allowable rated output and the moving masses must be kept overly large.

Abstract: There is disclosed a mechanical pressing machine in which an unbalanced inertia force, produced during reciprocal movement of a slider, is canceled without producing deflection in the whole of the pressing machine, thereby enhancing dynamic precision. The slider, slidably mounted at a lower portion of a frame, is connected to a dynamic balancer, slidably mounted at an upper portion of the frame, by link mechanisms. A press cam, having a cam surface in contact with cam followers mounted respectively on the slider and the dynamic balancer, is fixedly mounted on a cam shaft. Dynamic balancer cams, each having a cam surface in contact with cam followers mounted respectively on interconnecting points of the link mechanisms, is fixedly mounted on the cam shaft. The dynamic balancer is driven to move in a direction opposite to a direction of movement of the slider, so that an unbalanced inertia force, produced in the moving slider, is canceled by an oppositely-directed inertia force produced in the dynamic balancer.

Abstract: There is disclosed a mechanical pressing machine utilizing a drive cam, in which an unbalanced inertia force produced during a reciprocal movement of a slider or press member is canceled without producing a flexure in the whole of the pressing machine, thereby enhancing a dynamic precision. A drive cam and a rib cam are fixedly mounted on one end portion of an input shaft, and the slider is reciprocally moved vertically by the drive cam, and a balance weight is driven in the slider in a direction opposite to the direction of movement of the slider through the rib cam, sliding blocks, arms and the balance weight, so that an inertia force produced during the reciprocal movement of the slider is canceled by an oppositely-directed inertia force of the balance weight.

Abstract: In a mechanical pressing machine, a flywheel is fixedly mounted on an input shaft, and a drive cam plate is fixedly mounted on the input shaft intermediate opposite ends thereof, and a torque compensation plate cam is mounted on the other end of the input shaft. A cam follower mounted on a distal end of a piston rod of a resilient force-producing device is held in pressing contact with the torque compensation plate cam so as to cancel a load fluctuation produced on the input shaft. The resilient force-producing device employs a compression coil spring or an air spring. With this construction, a periodic inertial load fluctuation, repeatedly produced for every revolution during the operation of the mechanical press, is compensated for by the system for reserving energy, and hence is canceled, thereby balancing the energy, so that variations in rotation of the input shaft are eliminated, thereby reducing vibrations and noises.

Abstract: In a mechanical pressing machine, a torque compensation plate cam is mounted on one end of a crankshaft, and a cam follower mounted on a distal end of a piston rod of a resilient force-producing device is held in pressing contact with the torque compensation plate cam so as to cancel a load fluctuation produced on the crankshaft. The resilient force-producing device employs a compression coil spring or an air spring. The crankshaft may be of the dual type, in which case a slider is supported by two connecting rods. With this construction, a periodic inertial load fluctuation, repeatedly produced for every revolution during the operation of the mechanical press, is compensated for by the system for reserving energy, and hence is cancelled, thereby balancing the energy, so that variations in rotation of the crankshaft are eliminated, thereby reducing vibrations and noises.

Abstract: The push rods (16, 17) are connected via ball-and-socket joints (42-45) to the ram (3). The sockets (44, 45) are located within the push rods (16, 17) and the balls (42, 43) are located above the ram (3) and mounted to same. Thus, in case of off center loadings of the ram (3) no bending moments are transmitted to the push rods (16, 17). The entire bottom side of the ram (3) is available for the receipt of connecting members for the mounting of a tool to the ram.

Abstract: There is disclosed a mechanical pressing machine utilizing a crankshaft, in which an unbalanced inertia force produced during a reciprocal movement of a slider is canceled without producing a flexure in the whole of the pressing machine, thereby enhancing a dynamic precision. A balance weight, which is equivalent in weight to the slider vertically slidably supported on a frame, is slidably mounted on an upper portion of the slider for vertical sliding movement. The slider is driven through a first crankshaft and a connecting rod, and at the same time the balance weight is driven in a direction opposite to the direction of movement of the slider through a first gear fixedly mounted on the first crankshaft, a second gear, an intermediate shaft, flexible couplings, a second crankshaft and a connecting rod. As a result, an inertia force produced in the slider is canceled by an oppositely-directed inertia force of the balance weight.

Abstract: There is disclosed a mechanical pressing machine utilizing a rotation cam, in which an unbalanced inertia force, produced during a reciprocal movement of a slider, is canceled in a slider system without producing a large flexure in the whole of the pressing machine, thereby enhancing a dynamic precision. The slider and a balance weight are mounted respectively on an upper portion and a lower portion of a frame for vertical sliding movement. The slider and the balance weight are connected through links to a pair of sliding blocks which are reciprocally movable in opposite horizontal directions through a rib cam. With this arrangement, the slider and the balance weight are reciprocally moved vertically in opposite directions, respectively, so that an inertia force of the slider is canceled in the slider system.

Abstract: Four lever units are linked to the arrangement of connecting rods via a common bolt. Each lever unit drives one ram of the punch press. The rams are arranged in configuration of a square. This allows a much higher loading by off-center forces and the punch press can be designed for a given punch press output with considerably smaller dimensions.

Abstract: A double action mechanical press, especially for cupping operations in which an outer slide is provided within which an inner slide is reciprocally mounted on a common crankshaft. According to the present invention, a single dynamic balancer, out of phase from both the inner and outer slides, is provided on the crankshaft in order to counterbalance the inertial forces generated by the inner and outer slides during press operation.

Abstract: The balancing weight for the balancing of the rotating forces is connected via link members to respective balancing weights for the balancing of the oscillating forces. The balancing weights for the balancing of the oscillating forces are each pivotable mounted to the machine frame at one end via projections. At the respective opposite ends they include further projections, via which those ends are pivotably connected to each other via a pivot member. This forms the guiding of the movement of the balancing weights.

Abstract: A double action mechanical press, especially for cupping operations in which an outer slide is provided within which an inner slide is reciprocally mounted on a common crankshaft. According to the present invention, a single dynamic balancer, out of phase from both the inner and outer slides, is provided on the crankshaft in order to counterbalance the inertial forces generated by the inner and outer slides during press operation.

Abstract: An assembly of punch presses is provided for punching holes in first and second opposed flanges joined by a web in a structural beam. The first and second punch presses are arranged in a first pair to punch the first flange from a first side of the beam. A second pair of first and second punch presses are arranged to punch the second flange from a second side of the beam. The first punch press of each pair is arranged in a configuration offset from the second punch press of the pair along both the adjacent beam flange width and length. The offset configuration of the second pair has an opposite hand relationship with the first pair to permit the punch presses of the first pair to be positioned in an overlapping relationship with the punch presses of the second pair.

Abstract: An apparatus for performing mechanical operations such as piercing, punching and forming on a workpiece wherein the apparatus includes a carrier, a ram mounted for reciprocal movement on the carrier, a first fabricating tool mounted on the ram, a piston assembly mounted on the ram for reciprocal movement on the ram, a second fabricating tool mounted on the piston assembly, and a third fabricating tool mounted on the carrier. The first and third fabricating tools coact to perform a first work operation on a workpiece in response to relative movement between the ram and the carrier whereafter the second fabricating tool mounted on the piston assembly is utilized to perform a second work operation on the workpiece in response to relative movement between the piston assembly and the ram.

Abstract: The balancing weights are hingedly mounted at their lower ends to link rods. These link rods are hingedly mounted to an extended section of first rods. At opposite ends the balancing weights are hingedly mounted to reversing levers that in turn are hingedly mounted to second rods. The first rods and the second rods are supported on a common eccentric sleeve. Accordingly, the drive of the balancing weights does not come from structural members of the machine which are directly mounted to the ram. Accordingly, no mass forces and oscillations of the balancing weights and of the structures driving same can be transmitted onto the ram. Conclusively, the moving sequence of the ram and accordingly the cutting or embossing action is no longer influenced detrimentally such that the quality of a respective product produced is improved.

Abstract: A trim press for severing articles differentially pressure formed in a thermoplastic sheet comprising a stationary die member and a movable trim die member mounted on a frame for movement toward and away from the stationary trim die member between a spaced apart position and a closed position in which the trim die members engage opposite sides of a sheet to sever the article from the sheet. Dynamically balanced drive mechanism is provided for moving the platen in a to-and-fro path of travel while concurrently oppositely moving a counterbalance weight movably mounted on the frame.

Abstract: A power driven reciprocatory machine tool employs an endless belt trained in tension around spaced end pulleys to transmit reciprocatory movement of a drive attached to one run of the belt to a tool carrier clamped to the opposite run of the belt. The moving elements attached to the opposite runs of the belt counterbalance each other to minimize vibration generated by stroke reversal. In one application, the tool carrier mounts a relatively thin saw blade between spaced upper and lower arms which is employed to saw finely detailed edges on a workpiece manually guided to the blade on a stationary horizontal work table. Clamp means which are tightened by the tension of the blade couple the blade to upper and lower arms of the tool carrier, one of the clamp means being mounted on its arm by a manually adjustable blade tensioning device.The saw, tool carrier and drive may be rotatively adjusted about a horizontal axis to cut inclined or beveled edges on a workpiece supported on the stationary horizontal table.

Abstract: An improved punch assembly (10) for a punch press comprises a main piston (13) driving a punching tool (11) and an auxiliary piston (17) which can be selectively enabled to cooperate with the main pisto1 (13) in a high force, slow speed mode or disabled to allow the main pisto1 (13) to operate alone in a low force high speed mode. The punch assembly (10) also comprises a pressure transducer (41) and position transducer (25) whose respective outputs are connected to a microprocessor controller for the punch assembly. Operation of the punch press is microprocessor controlled to reduce noise and punch cycle time. A stripper assembly (42-48) is also provided and operates in conjunction with the punching tool (11) under microprocessor control to facilitate tool stripping. The stripper assembly (42-48) can also be used for automatic measuring of work sheet thickness.

Abstract: In a knockout device which is mounted in a press-machine in order to knock out a punched work plate such as a printed board and the likes from punches through a knockout actuation-plate, cylinder chambers as an oil hydraulic knockout cylinder is formed in the upper portion of a base plate fixedly secured to the underside of a slide and an actuation-plate guide hole is formed in the lower portion of the base plate respectively. The cylinder chambers are disposed at the eccentric positions offset toward the periphery of the actuation-plate hole respectively. The knockout actuation-plate provided in the actuation-plate guide hole is adapted to be driven downwardly protrusively by the pistons provided in the cylinder chambers, and to be linearly guided by the peripheral surfaces of the knockout actuation-plate and of the linear guide boss protruded upwardly from the central portion of the knockout actuation-plate.

Abstract: An apparatus for performing two successive work operations on a workpiece in an equalized force mode. The apparatus includes a base; a yoke mounted for bi-directional movement on the base and carrying a two-sided punch on its upper face; a ram member mounted within the yoke and including two bores opening in opposite faces of the ram member and slidably receiving two pistons secured to the opposite end walls of the yoke; and means for delivering pressurized fluid through the pistons to sealed pressure chambers defined at the inner ends of the pistons between the piston inner ends and the respective confronting faces of the ram to selectively move a pair of die members carried on the upper face of the ram into and out of punching coacting with the double punch carried on the yoke.

Abstract: In a punching machine, a yoke is supported on an eccentric section of the crankshaft. The yoke is designed to counterbalance the rotating forces. Both ends of the yoke are pivotably connected to connecting rods. Both connecting rods are pivotably connected, in turn, to a vertically-guided counterbalancing weight to counterbalance the oscillating forces.

Abstract: A first eccenter sleeve allocated to the drive of the devices operative for the balancing of masses is drivingly connected to the eccenter shaft by means of a displaceable locking bolt. The first eccenter sleeve is provided with pins and slide rings engaging into slots in the second eccenter sleeves. The second eccenter sleeves are connected via punch connecting rods to the ram of the machine. Slides are supported in the machine frame, which slides can be moved into slots provided in the second eccenter sleeves. Accordingly, all three eccenter sleeves can be held against rotation on the eccenter shaft. The drive connection between eccenter shaft and all eccenter sleeves proceeds accordingly via one single connecting member, namely the locking bolt. And this locking bolt operates together with one eccenter sleeve. Accordingly, no splined shafts which must be machined extremely precisely but are prone to knock out during operation are necessary.

Abstract: An equilibrium apparatus of cut-off mechanism for high-speed nut former which includes a cutting unit carrying a cutting tool thereon, and a counterweight unit carrying a counterweight unit thereon. The cutting unit and the counterweight unit are connected pivotally to a coupling unit which is fixed on the machine table of the nut former at the central portion thereof so that the cutting unit and counterweight unit are capable of effecting straight motion. A push plate is drivable to move in a first direction so as to push the cutting unit and the counterweight unit to move in a second direction perpendicular to the first direction in such a manner that only one of the cutting unit and the counterweight unit is pushed. A spring device is disposed on the cutting unit and the counterweight unit for absorbing the shock produced from the cutting action of the cutting tool and for biasing the cutting unit and the counterweight unit to move in a third direction which is opposite to the second direction.

Abstract: A self-equalizing device for performing mechanical operations such as piercing and punching wherein the piston means forming the work ram is internally mounted within the proximal portion of a yoke body, the yoke body being in turn mounted for sliding or rolling displacement on a stationary base. A knock out slot for a pin type punch is provided in the external portion of the piston ram. Single and multiple action devices are disclosed.

Abstract: Cutting apparatus (15) for cutting-out stacks of sheet material such as fabric has a guide (55) for a reciprocating cutter (16), driven by a drive mechanism (18) arranged in a housing (19). The housing (19) is mounted on a carrier (8) extending above a cutting-out table (2). The cutter (16) is driven from an eccentric (38) arranged on a rotary member (36). A counterweight (41) is driven from a second eccentric (39) with an eccentricity (e) which is oppositely directed to the eccentricity (e) of the first eccentric (38) driving the cutter (16), to compensate for inertial forces generated by the mass of the cutter (16). The cutting apparatus (15) is free of turning moments acting substantially in a plane lying in the axis (36) of therotary member (32), by arranging the eccentrics (38, 39) in a turning plane (E.sub.1) on the two rotary members (32, 33), the members (32, 33) lying one behind the other with respect to the cutting direction (34) of the cutter (16) and rotating at the same speed as each other.

Abstract: An eccentric press which can be constructed a single connecting rod machine or a twin connecting rod machine is described. The press includes a stroke adjustment means having a support lever which is articulately connected at the joint between the two portions of a lever arrangement. The articulation joint is guided on an adjustable path of movement and the foot point of the support lever is guided variably in its position on a circular arc, the center point of the circular arc coinciding with the position of the articulation point which corresponds to the bottom dead center of the ram. As a result, a change in the ram stroke does not change the bottom dead center of the ram, only one ram stroke being executed per connecting rod revolution.

Abstract: A scroll saw is disclosed having a yoke with upper and lower reciprocable arms terminating in upper and lower ends having a saw blade connected therebetween. A motor, with a horizontally extending drive shaft, is mounted on the base for the saw. A connecting rod is coupled eccentrically at one end to the drive shaft and at the other end to the lower arm of the yoke. A second shaft is rotatably mounted on the base parallel to the drive shaft and is driven by intermeshing gears on the shafts. First and second counterbalances are mounted on the shafts which rotate with the shafts in opposite directions. The counterbalances, each having a center of mass offset radially from an axis of the shaft, are positioned on the shafts so as to enhance or compound the inertial effects of the counterbalances in a vertical direction to cancel out the inertial effects of the reciprocating yoke, and so as to cancel the inertial effects of each other in a horizontal direction.

Abstract: A self-equalizing device for performing mechanical operations such as piercing and punching wherein the piston means forming the work ram is internally mounted within the proximal portion of a yoke body, the yoke body being in turn mounted for sliding or rolling displacement on a stationary base. A knock out slot for a pin type punch is provided in the external portion of the piston ram. Single and multiple action devices are disclosed.

Abstract: An apparatus for performing two successive work operations on a workpiece in an equalized force mode. The apparatus includes a base; a yoke mounted for bi-directional movement on the base and carrying a two-sided punch on its upper face; a ram member mounted within the yoke and including two bores opening in opposite faces of the ram member and slidably receiving two pistons secured to the opposite end walls of the yoke; and means for delivering pressurized fluid through the pistons to sealed pressure chambers defined at the inner ends of the pistons between the piston inner ends and the respective confronting faces of the ram to selectively move a pair of die members carried on the upper face of the ram into and out of punching coacting with the double punch carried on the yoke.