Abstract: The guide columns of the punch press are releasably mounted to the base plate. Guide sleeves project from the ram and the guide columns are guided inside of the these guide sleeves. The sealing between the guide columns and the guide sleeves is made by piston rings. Leakage oil is collected at the oil collecting ring and discharged through a transfer channel (11) located in the ram (2) towards an inner space of the guide sleeve. A horizontally mounted check valve is located in this oil transfer channel. The guide column includes a leakage oil channel which extends to the oil collecting space in the base plate. In operation oil present in the oil collecting ring is pumped into the oil collecting space due to the continously changing of the volume of the inner chamber such that no leakage oil can enter the punching work space. The check valve opens during the upwards movement of the ram and closes during the downwards movement thereof.

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: A drive or drive arrangement for a movable work component, such as the ram of a punch press, stamping machine or the like, comprising a crosshead driven by a crank drive. At both sides of the crosshead there are hingedly connected one respective end of single-arm levers, the other ends of which are hingedly connected with threaded spindles supported in the machine housing for adjusting the stroke of the drive, and the intermediate bearing or support locations of the levers are hingedly connected via connecting or pressing rods with the ram.

Abstract: An apparatus for the mass compensation at a machine driven by means of a crank drive including a crankshaft, especially a punch press or stamping machine, comprising at least one compensation weight which is connected with a piston or cross-head and the crank drive in order to realize a mass compensation both of the oscillating masses and of the rotating masses. A double-lever is hingedly connected by means of its one end with the compensation weight in order to realize mass compensation of the rotating masses and is hingedly connected by means of its other end with the crank drive via a first guide or link. The one end of the double-lever is directly connected at the compensation weight, and an intermediate bearing means of the double-lever is hingedly connected via a second guide or link, directed towards the side of the crank shaft, with the machine housing or a component fixedly connected therewith.