Abstract:
An approach is provided for applying a release agent to a substrate having a first surface and a second surface. The approach involves causing, at least in part, a release agent supply device to supply release agent to a release agent applicator. The approach also involves causing, at least in part, a release agent metering device configured to control an amount of release agent applied to a roller configured to apply release agent to the first surface of the substrate. The roller is configured to accommodate the substrate under a tension over at least a portion of a circumference of the roller such that a pressure is exerted between the roller and the first surface of the substrate.
Abstract:
A method of controlling a powder sprayer having a fan jet nozzle configuration in a printing press, includes controlling the fan jet nozzle configuration as a function of operating parameters of the printing press. A printing press having a powder sprayer is also provided.
Abstract:
To generate a high-contrast image of powder particles located on the surface of a print product, a measurement apparatus has an illumination unit which generates a measurement light beam which strikes the surface of the print product at glancing incidence. A measurement optics has an axis vertical to the surface of the print product and a diaphragm body is arranged in its focal point on the image side. The measurement optics forms an image of a surface region of the dusted print product on an image converter. An electronic evaluation unit determines the number and size of the powder particles from the image obtained on the image converter.
Abstract:
Apparatus for protecting the surface of freshly printed sheets which are deposited upon one another to form a sheet pile includes an applicator for applying to the respective sheets a separating-agent layer formed of solid particles of separating agent, the layer of separating agent being formed of a mixture including at least one degradable separating agent substance, an aqueous vehicle liquid, and at least one mixture component which degrades the separating agent substance upon simultaneous contact with the separating agent substance and the vehicle liquid.
Abstract:
A control system for controlling auxiliary devices of a printing press. Auxiliary devices are connected to a centralized system controller for operation thereof. The system controller provides an image of control panels for controlling each of the auxiliary devices on a single display screen. A touch screen controller is combined with the display screen and the system controller, allowing a press operator to set and control the operating parameters of the devices from control panel images on the display. The parameters for the auxiliary devices may be saved as a set and recalled for later use on similar job runs.
Abstract:
A powder dusting apparatus for dusting printed products with fine powder has a plurality of nozzle bodies (42) arranged in parallel one beside the other, which emit the powder mist. The spacing of the nozzle bodies (42) can be adjusted by a thread drive (26, 66) and a lazy tongs arrangement (52).
Abstract:
The attachment is selectively usable to apply heat, anti-offset powder, or both heat and powder to freshly printed sheets passing to the sheet collection station of a printing press. Operation of the heat and/or powder applying assemblies is changed automatically to compensate for changes in the press speed. The location at which heat is applied to the sheets is upstream from that at which powder is applied, and is spaced from the collection station. Shields and air currents assist in regulating heat transfer. A compact housing assembly supports both heat and powder applying components.
Abstract:
Freshly printed sheets are sprayed with antioffset material while being transported from the printing station to the sheet stacking station of a printing press. The control circuitry for the spray apparatus includes a sensor for detecting and signalling the location of successive ones of the sheets, and timers whose timing periods determine when each cycle of operation of the spray apparatus is initiated and terminated. The time periods are manually adjustable by potentiometers associated with the timers, and are automatically and compensatingly adjusted in response to changes in the press speed. Operation of an air compressor component of the spraying apparatus terminates automatically after spraying of the final printed sheet of a press run.
Abstract:
A powder spray attachment for printing presses for mounting above the delivery tray comprises a cylindrical tube having a plurality of ports along the length thereof for mounting transverse to the delivery tray with a plurality of movable clamps on the tube for selectively closing selected ports for delivery of powder at selected positions along the width of sheets of paper delivered to the delivery tray.
Abstract:
A plastics material covered metal electrode maintains an electrostatic field dissipating the particles of fine dry powdered dielectric material such as flour or starch to create a cloud or dry mist of the powder in the path of freshly inked sheets as they are discharged from a printing press to prevent smudging of the ink and sticking together of the successive sheets as they are stacked. The electrostatic field is formed across the path of the powder as it is discharged from a supply trough by energizing the electrode with a high voltage current. The plastic covered electrode replaces heretofore required neon gas filled glass tubes which are fragile and burn out. The preferred plastic covering for the electrode is a thermoplastic polyetherimide resin marketed under the name of "Ultem" by General Electric Company of Pittsfield, Mass.