Abstract: The supply of water to a diazo printer is varied in relation to the speed of operation of the printer by deriving a train of pulses recurrent at a repetition rate proportional to printer speed, applying the pulses to an adjustable digital divider which divides down the repetition rate by an adjustable divisor D, and applying the divided-down pulse train to a water pump to control the rate of water supply. Switching means are provided in the divider to enable adjustment of the valve of the divisor D. This permits adjustment of the absolute rate of water delivery for any given motor speed, after which the rate will automatically change in proportion to printer speed.

Abstract: The speed of a diazo printer is sensed and the rate of ammonia delivery to the developer chamber is automatically boosted at higher printer speeds. Preferably, a sensor positioned adjacent a rotary paper-drive member produces electrical pulses at a rate proportioned to the speed with which the copy paper passes through the developer chamber, and an electronic circuit board contains circuitry which senses when the rate of recurrence of these pulses rises into a predetermined range; when this occurs, the circuitry causes a solenoid valve to deliver an ammonia boost directly to a perforated tube located within the perforated tube through which the normal ammonia supply takes place at lower speeds.

Abstract: The disclosure involves systems for processing foldable sheets, especially prints made from reproducibles of different characteristics (for example, of different sizes, shapes, and other categories), said systems comprising methods or techniques, as well as apparatus; and in a typical sheet-processing system there is a coordination of printing, conveying, alining, sensing, marking, folding, sorting and stacking of flexible sheets such as blueprints or the like -- mostly or entirely in an automatic manner.

Abstract: A cut-sheet feeder, for delivering various sizes of sensitized paper sheets to the feed table of a printing machine, has nested adjustable magazines for storing quantities of sheets of several predetermined sizes, and the magazines extend at an angle beneath the table and have curved discharge throats for projecting sheets, one at a time, above and onto the table; said throats serving also as light-shields or hoods. Layers of frictional material are positioned to hinder the discharge of sheets from the magazines, excepting for the foremost sheet of each stack, which is normally in contact with a feed roller, urged against it by a spring, and the feed rollers are individually driven, each by a separate motor, and coordinated by an electrical control system; the feed-roll drive including an over-running clutch so that the operator can pull a sheet out, if desired, beyond the point to which it may be fed by the feed-roll when actuated by the timer-controlled motor.