Abstract: A seal apparatus is disclosed for sealing dampening solution which is disposed within a reservoir extending from a nip defined between a form roller and a metering roller of a lithographic printing machine. The apparatus includes a source of pressurized air and device for directing a flow of air from the source of pressurized air towards an edge of the reservoir and between the form and metering rollers such that the flow of air generates an air dam for sealing the reservoir so that leakage of the dampening solution from the edge of the reservoir is inhibited.

Abstract: A seal apparatus is disclosed for sealing dampening solution which is disposed within a reservoir extending from a nip defined between a form roller and a metering roller of a lithographic printing machine. The apparatus includes a source of pressurized air and device for directing a flow of air from the source of pressurized air towards an edge of the reservoir and between the form and metering rollers such that the flow of air generates an air dam for sealing the reservoir so that leakage of the dampening solution from the edge of the reservoir is inhibited.

Abstract: A collator apparatus is disclosed for assembling a plurality of continuous forms into a sequence of multi-layer forms. The apparatus includes a numbering device which is disposed adjacent to the sequence of forms for applying a number to a first form of the sequence. The device includes a numbering wheel having an axis of rotation disposed normal to a direction of movement of the sequence of forms past the wheel, the wheel defining a peripheral surface. A printing device is secured to the peripheral surface for printing the number of the first form when the printing device contacts the first form during mutual movement of the printing device and the first form. A locking mechanism is operably connected to the wheel for selectively locking the wheel against rotation thereof. The locking mechanism locks the wheel in a first rotational disposition of the printing device until the first form reaches a first location relative to the first disposition.