Abstract: The invention concerns a coating system with at least one web support roll and at least one corresponding metering roll coordinated with it and having a grooved surface essentially in peripheral direction or in the form of a threading, for metering the coating substance in the gap existing between the web support roll and the metering rolls. A groove forming or groove truing system can be infed in the operation of the coating system can be infed onto the metering rolls.

Abstract: Device for processing a viscous fluid for finishing printing products in a finishing unit of a rotary printing press, the finishing unit having a plurality of rollers suppliable with the fluid at least at one feeding location thereof, and a plurality of cylinders suppliable with the fluid by the plurality of rollers, includes a device for collecting the fluid from the one feeding location thereof, the plurality of rollers including a metering roller engageable with one of the cylinders for feeding the fluid thereto, another roller of the plurality of rollers being in cooperative engagement with the metering roller and with the collecting device for feeding the fluid to the metering roller.

Abstract: A method and apparatus for limiting the width of a coating and/or preventing damage to roll ends while coating or surface-sizing paper or an equivalent web material in a coating device in which a coating agent, such as size, coating paste or equivalent, is introduced into the coating device to an application zone defined by a coating member, a moving base, lateral seals, and a front wall and spread onto the moving base by the coating member which is loaded against the moving base. Liquid jets are sprayed into the areas outside the coating width, substantially over the width defined by the lateral seals and the roll ends, either onto the moving base before the coating member in the running direction of the moving base or directly into the nip formed by the moving base and the coating member. The liquid jets lubricate the nip and dilute the coating agent that has entered into the areas outside the coating width.

Abstract: A gumming roll preferably for use with apparatus for applying gum to blanks and pertains has gear driven rollers and the rollers are in skidding contact for returning excess adhesive to an adhesive pan without substantial foaming of the adhesive. The gumming apparatus speed of operation is greater than the conventional apparatus in which adhesive foaming is a problem.

Abstract: Lubricant is applied to the rolls of the size press to lubricate the rolls prior to moving the coating heads into their coating position by substantially simultaneously applying a lubricating film to each of the rolls of the size press in stripes symmetrically positioned relative to the center line of the web passing through the size press to in stages symmetrically relative to the axis of the web substantially equally increase the surface area of the roll to which the lubricating film is applied until the full surface corresponding to the full width of the web on each of the rolls is lubricated and then a metering rod type coating head apply coating to each of the size press rolls are simultaneously moved into coating position.

Abstract: A method for coating a metallic substrate with an oily substance. Use is made of a support member having a ceramic coating comprising an oxide ceramic material, onto which is applied the oily substance to form a film of the oily substance uniformly covering the surface of the ceramic coating, the film of oily substance breaking down into micro-droplets having substantially uniform size and distribution. The micro-droplets of oily substance are thereafter transferred onto a surface of the metallic substrate without substantially altering the size and distribution of the micro-droplets, thereby coating the surface of the metallic substrate with the oily substance. The invention is particularly useful for coating the positive electrode of a high-speed electrocoagulation printing apparatus with an olefinic substance containing a metal oxide.

Abstract: A stand alone printing system (10) for coating a first face of sheets on which printing may be printed previously by a printer not associated with the system includes a feeding mechanism (14), a driven application roller (76) for transferring coating material disposed on the peripheral surface (77) to the first face; a metering device (78) for transferring a uniform thickness of coating material to the peripheral surface of the application roller; a driven impression roller (85) which contacts a second face of the sheets and which contacts the peripheral surface of the application roller at least at gaps disposed between the sheets during feeding of the sheets along the coating zone which transfers the coating material to the peripheral surface (86) of the impression roller; and a coating material removing mechanism (116) for removing coating material from the peripheral surface of the impression roller prior to rotation of the peripheral surface of the impression roller to a point of contact with the second

Abstract: The invention relates to a coating device for coating, e.g. a size-press roll, paper or board or of an equivalent moving base. The coating device comprises a revolving coating bar which rests against a moving base. The coating bar extends across the machine width and is supported in a cradle substantially over its entire length. The coating bar spreads and smoothes the coating agent onto the moving base which coating agent is introduced into the coating device in the running direction of the moving base before the coating bar. The coating bar in accordance with the invention is a smooth bar of large diameter arranged against the moving base so that the profile of coating quantity can be controlled.

Abstract: A gumming roll preferably for use with apparatus for applying gum to blanks and pertains, has rollers in skidding contact for returning excess adhesive to an adhesive pan without substantial foaming of the adhesive.

Abstract: A coating device includes a plurality of parallel coating blade lamellae made from highly wear-resistant material. The lamellae are disposed against one another in a housing and held thereby, forming a lamella packet wherein each lamella of the packet is disposed at the same inclination with respect to a plane perpendicular to a longitudinal axis of the packet. The inclination of the lamellae is adjustably controlled by at least one adjusting device acting on the packet. Thus, a change in lamellae inclination also changes a step-wise configuration of a surface contour formed by neighboring lamellae of the packet.

Abstract: A method and apparatus for coating a metallic substrate with an oily substance. Use is made of a support member having a ceramic coating comprising an oxide ceramic material, onto which is applied the oily substance to form a film of the oily substance uniformly covering the surface of the ceramic coating, the film of oily substance breaking down into micro-droplets having substantially uniform size and distribution. The micro-droplets of oily substance are thereafter transferred onto a surface of the metallic substrate without substantially altering the size and distribution of the micro-droplets, thereby coating the surface of the metallic substrate with the oily substance. The invention is particularly useful for coating the positive electrode of a high-speed electrocoagulation printing apparatus with an olefinic substance containing a metal oxide.

Abstract: A book binding process and apparatus are shown wherein polyurethane adhesive (PUR) attaches a crepe portion of a book binding to a book block and hot glue attaches the crepe portion to the book cover. The PUR delivery system includes an inclined trough positioned adjacent a polyurethane adhesive delivery roll. A polyurethane adhesive source delivers polyurethane adhesive upon the inclined surface of the trough and the polyurethane adhesive is metered onto the roller as a function of the separation of the leading edge of the trough and the roller.

Abstract: A continuous strip coating machine has top and bottom applicator rolls and a backup roll adjacent the top applicator roll. A lift roll to lift the strip of material and thus vary the angle of wrap of the strip about the bottom applicator roll is provided. The use of the lift roll in turn varies the pressure between the strip and the roll and thus the thickness of the coating applied to the strip bottom. Thickness may be measured indirectly by measuring pressure of the strip on the applicator roll. Thickness may also be measured directly. Oscillations of the strip in a drying oven may also be sensed and compensated for. Feedback control is used with the thickness measuring techniques to control the coating thickness by varying angle of wrap, relative speed between the applicator roll and strip, and/or nip pressure between the applicator roll and a transfer roll that transfers coating material to the applicator roll.

Abstract: A roll coating machine for applying liquid materials onto sheet material workpieces. The machine has particular application in the area of coating flexible foam sheets with stiffening or adhesive agents. The roll coater incorporates mechanisms for controlling the spacing between coating rollers which apply the liquid materials onto one or both sides of the workpiece and enables automatic adjustment for various thickness of material. Automatic adjustment is provided through accurate force balancing of one of the rollers and applying a highly controlled net force acting on the rollers such that the rollers self-adjust based on compression of the workpiece. Another mechanism provided in the machine of this invention incorporates pre-gauging and a cam adjustment mechanism for setting separation distance which can be used independently or in conjunction with a force balancing approach mentioned previously.

Abstract: A method and device for keeping a coating rod and a rod cradle in a bar coater clean and for preventing leakage of the lubrication and/or cooling water used in the bar coater is disclosed. The invention is intended for a bar coater in which the coating rod is, supported revolvingly in a rod cradle substantially over its entire length. The rod cradle is attached to the frame constructions of the coater. The rod cradle is also provided with at least one groove substantially parallel to the coating rod and open towards said coating rod, in which grooves(s) water is circulated to lubricate, cleanse and/or cool the coating rod and the rod cradle. The coating rod is loaded towards the base to be coated by loading the rod cradle.

Abstract: Apparatus for sizing warps made of textile threads for the weaving process by application of a sizing liquor by means of rollers and subsequent removal of the excess liquor by roller conveyance through dehumidification--and drying zones, where following upon a preparation zone with an inlet guide roller at least one size application roller respectively facing the one or the other side of the warp is disposed, where the size application rollers are provided with sizing rollers motor driven with selection of the rpm and/or direction of rotation disposed slighty below the size application roller, this for observing the previously selected sizing application thickness, with the sizing rollers dipping with at least one-third of their circumference into the sizing liquor fed into tanks disposed beneath the size application rollers and where furthermore the rotational axes of the sizing rollers disposed beneath the size application rollers and the rotational axes on the size application rollers lie on a straight lin

Abstract: An apparatus serves for the metered coating of an inking roller (1) with a fluid coating medium, in particular an inking roller in a printing press which directly or indirectly inks a printing form, whereby the inking roller (1) is in contact with a soft transfer roller (2) or soft printing roller arranged in parallel, and whereby the surfaces of the inking roller (1) and the transfer roller (2) or the printing roller respectively at least have a path speed which is more or less identical. The surface of the inking roller (1) dips directly into the coating medium (3), whereby the thickness of the film of coating medium (3) remaining on the surface of the inking roller (1) is determined by a wiping roller (4) which is arranged parallel to the inking roller (1), is supported on this, has an engraving and, in comparison to the inking roller, a small outside diameter.

Abstract: A coating device includes a transfer roller communicating with a bank of coating material and engaging a web of material to be coated, a squeegee bung mounted to resiliently press against a periphery of the transfer roller and to define a contact surface across which the coating material flows, and a counter roller provided with an air blade for final dosing of the coating material applied to the web.

Abstract: A device for adjusting the distance between a web leading roll, such as a corrugating roll, and a glue applying roll in a glue unit comprises a shaft arranged to extend across the frame of the machine parallel to the glue applying roll with the gluing unit for the glue applying roll engaging the shaft, an arrangement for lifting the gluing unit to rotate around the shaft so that the glue applying roll will be positioned closer to the web leading roll and the device includes at least one cam mounted in the frame to engage a stop on the subframe of the glue unit to limit the amount of movement in elevation of the gluing unit.

Abstract: This invention relates to the treatment of substrates with fluidized material in repetitive patterns during application cycles. The treatment patterns made with this invention can be altered by changing machine operating parameters. The patterns of fluidized material are applied to substrates using an applicator drum. Machined in the outer surface of the applicator drum are a plurality of slots filled with deformable material. The deformable material extends to a position in each slot just short of the outside diameter of the applicator drum, leaving a cavity in each slot. These cavities are filled with slurry in a slurry applicator unit. A compression drum mounted within the hollow interior of the applicator drum uses compression tips to displace the deformable material in each slot in succession beyond the periphery of applicator drum at a position adjacent to the substrate, causing the slurry in the cavity to be applied to the substrate.

Abstract: A device for applying coating composition to a fiber web has at least one application roll for receiving a film of coating color at a feed location and for then delivering it to the fiber web at a delivery location. A nozzle applicator feeds coating color to a nozzle at the feed position of application roll. The nozzle has a downstream lip with a metering doctor on it for metering the thickness of the coating color applied to the roll. The nozzle has an upstream lip in the form of an overflow ledge spaced from the surface of the application roll. Coating liquid overflows the overflow ledge and is collected in a first overflow trough. To clean the outer surface of the application roll before coating color is thereto applied, a scraper blade scrapes the surface of the roll. Upstream in the rotation path from the scraper blade is a sprayer for spraying liquid on the application roll so that the scraper scrapes the surface of the application roll with liquid on it.

Abstract: A squeegee device for applying a substance to a web of material, comprising lateral boundary plates for the squeegee slidably guided in a direction normal to the web, the boundary plates being provided with inserts of magnetizable material, which can be attracted by a magnet arranged beneath the web of material.

Abstract: The invention concerns a device for metering of a coating agent onto a moving base, such as a paper or board web. The device includes first and second soft-faced applicator rolls defining a coating nip, through which nip a web is passed. The first applicator roll is journalled as fixed on a frame of the device, and the second applicator roll is linked to the frame of the device pivotally by the intermediate of a loading arm or the equivalent. At least one of the applicator rolls is in nip contact with a hard transfer roll, which is further in nip contact with a soft-faced metering roll. A pond of coating agent is located in a metering nip between the metering roll and a transfer roll. As the rolls revolve, the coating agent is transferred through the metering nip onto the face of the transfer roll and from there further through a transfer nip formed by the transfer roll and the applicator roll onto the face of the applicator roll.

Abstract: A web of flexible material is pressed between a counterroll and a pressing roll to which the pressing force is applied by magnetic, fluid-pressure or switching means via a force-multiplying lever arrangement.

Abstract: A coating method is performed by positioning a coating roll directly beneath one end of a predetermined coating range of a printing roll so that the coating roll is perpendicular to the printing roll. The rotating roll rotates and carries a coating liquid which is to be coated on the printing roll that is held horizontally. The printing roll is rotated, and the coating roll is also rotated in a direction in which the carrying of the coating liquid takes place on a leading side of the rotating roll with respect to the traveling direction of the coating roll. The coating roll and is moved from one end to the other of the coating range on the printing roll in such a manner that the coating roll is kept in contact with the printing roll and the coating liquid is coated on the printing roll.

Abstract: The invention relates to a coating device for coating, e.g. a size-press roll, paper or board or of an equivalent moving base. The coating device comprises a revolving coating bar which rests against a moving base. The coating bar extends across the machine width, and is supported in a cradle substantially over its entire length. The coating bar is fitted to spread and to smooth the coating agent onto the moving base which coating agent is introduced into the coating device in the direction of running of the moving base before the coating bar. The coating bar in accordance with the invention is a smooth bar of large diameter, which is fitted against the moving base so that the profile of coating quantity can be controlled.

Abstract: In one embodiment, a bowling lane dressing apparatus has a carriage. With a lane buffer roller and a transfer roller in rolling engagement with the lane buffer roller and in fluid communication with a reservoir containing lane dressing fluid for transferring fluid from the reservoir to the lane buffing roller. A variable speed drive is connected to the transfer roller for rotating it at variable speeds to vary the rate of transfer of fluid from the reservoir to the lane buffer roller. In a second embodiment, the transfer roller is separated into independently rotatable roller segments, each of which can be driven by separate variable speed motors. The segments may comprise a center roller segment driven by one variable speed motor, a pair of track roller segments at opposite ends of the center roller segment, respectively, driven by a second variable speed motor, and a pair of outer roller segments at opposite outer ends of said track roller segments, respectively, driven by a third variable speed motor.

Abstract: A roll (30) of adhesive worked between two rollers (10, 12) of the gumming device is supplied by feed nozzles (34a, 34b) projecting fine streams of adhesive (35a, 35b) with monitored flow. In case of an increase in the measured viscosity of the adhesive or stopping of the machine on which the gumming device is used, a water-atomizing device (40) allows the viscosity to be reduced and prevents the adhesive from drying out. A dimension of the adhesive roll is monitored and controls regulation of the output of the adhesive-feeding nozzles. The gumming device thereby ensures proper gumming of a strip of paper (2).

Abstract: A coating apparatus for use in a sheet-fed or web-fed, offset rotary or flexographic printing press to apply a protective and/or decorative coating to the surface or freshly printed sheets includes a doctor blade coating unit coupled to a pickup roller for supplying liquid material from a reservoir to the surface of a pickup roller mounted on a press delivery drive shaft. Liquid material is circulated through the reservoir of the doctor blade unit by suction flow produced by a return pump. This prevents the buildup of a positive pressure differential within the doctor blade reservoir. The doctor blade reservoir is maintained at below ambient pressure level, thereby preventing leakage through the end seals. A vacuum sensor circuit provides a visual indication of air vacuum pressure in the doctor blade reservoir chamber, and a vacuum sensor switch applies electrical power to an audio transducer.

Abstract: A coating section for coating a traveling web of material, such as paper, wherein the web to be coated travels along a selected one of two different web paths. There is a lower counter roll and an upper press roll which define a nip between them and the distance apart of the two rolls is adjustable. A respective applicator for coating composition is on each of the first and second sides of the lower roll and on the third side of the upper roll, and the third side is the same side of the coating section as the first side of the lower roll. First web guide rollers guide the web from below, past the counter roll and the first applicator and not through the nip. Second guide rollers guide the web through the nip.

Abstract: A device for dosing coating substances onto a travelling web. A doctor roll has circumferential grooves which are separated from each other by lands. Each of the lands has a surface parallel to the center axis of the roll when viewed in the direction of the center axis. The respective widths of the lands, viewed in the center axis direction, maximally equal the maximum width of the cross section of the circumferential grooves.

Abstract: An addition to a multi-color lithographic offset printing press comprising a self-contained coating unit moveable into and out of operative relationship with an impression cylinder on the press unit (e.g. the impression cylinder of the last press unit) without interrupting or disrupting printing taking place in this last stage. The coating unit includes a special blanket cylinder, a transfer cylinder and doctor or metering means to control the amount of coating material on the transfer cylinder. Inclined tracks are provided to guide the coating unit into and out of operative relationship with the impression cylinder of the last printing stage.

Abstract: In accordance with this invention, a bowling lane dressing apparatus is provided which has a carriage for movement along the bowling lane between the foul line and the pit. Drive wheels are rotatably mounted on the carriage for moving the carriage along the bowling lane by means of drive means connected thereto. A lane buffer roller is journaled on the carriage in lane-contacting relation which extends transversely to the direction of travel. A reservoir is mounted in the carriage for storage of lane-dressing fluid. A transfer roller is mounted in rolling engagement with the lane buffer roller and in fluid communication with the reservoir for transferring fluid from the reservoir to the lane buffing roller. Variable speed drive means is connected to the transfer roller for rotating it at variable speeds to vary the rate of transfer of fluid from the reservoir to the lane buffer roller.

Abstract: The invention concerns a device and method for limiting of the width of coating in coating of paper or board. The coating agent is spread onto a moving base to be coated by means of a coating device provided with a grooved coating bar. The coating agent is spread substantially only over the width of the web and any coating agent extending substantially beyond the web width is scraped off the base to be coated with the aid of smooth end areas fitted at both ends of the coating bar. The invention is also related to a device for carrying out the method.

Abstract: Coating apparatus for applying continuous or spot coatings to an image printed surface includes a plate cylinder; a blanket cylinder for transferring a coating material from the plate cylinder to the copies; a blanket coating roller for transferring a continuous layer of coating material to the blanket cylinder; a plate coating roller for selectively applying spot coating material to the plate cylinder; a first retractor for moving the blanket coating roller laterally into and out of transferring engagement with the blanket cylinder; and a second retractor for moving the plate coating roller into and out of transferring engagement with the plate cylinder.

Abstract: A doctor bar consists of two different circular disks that are clamped or fixed in some other way on a cylindrical carrier bar. Circular disks having a smaller diameter and made from elastic material alternate with circular disks that have a larger diameter and are made of a very wear-resistant material, specifically ceramic. The difference in the outside diameter makes for one-half the groove of peripheral grooves of the doctor bar that are formed between the various circular disks.

Abstract: A glue cell apparatus for applying glue in a web printing unit is disclosed, which apparatus includes one or more self-contained modular units that have a finite width in the direction of the width of the web to which glue is applied. The modular units are carried and mounted upon a rail structure that extends substantially across the full width of the web and a drive shaft is also provided which also extends substantially the same distance. Each of the glue cells preferably has a transfer cylinder that is driven by the drive shaft that is operably connected and driven by the gluing and/or coating machine, and a metering roller subassembly having a metering roller which calibrates the thickness of the layer of glue that is ultimately applied to the web. The metering roller has an internal hydraulic motor which drives the same. In an alternate embodiment, a pan roller subassembly is also provided.

Abstract: Disclosed is a liquid transferring unit having a tank carrying a liquid such as, for example, a glue or an ink, an applicator roll with a part thereof being immersed within the liquid disposed within in the tank, a doctor roll which scrapes off or removes the surplus liquid taken up by means of the applicator roll, and a pair of dam plates which are disposed within the tank so as to be movable toward and away from each other along a direction parallel to the axis of the applicator roll; characterized in that the pair of dam plates have regulating sections, respectively, which can be abutted against the opposing circumferential portions of the two rolls, so that the triangular space defined between the two rolls may be closed by means of such regulating sections.

Abstract: Coating apparatus and method of operation where the rotatable transfer cylinder and the rotatable metering roller of the coating device do not have internal cooling, but the heated coating liquid which is discharged from the nip between these rollers is itself cooled before being recirculated to a liquid holding pan beneath the transfer cylinder. A liquid catch tray is positioned below the metering roller for receiving coating liquid dripping from the metering roller, the catch tray having a downward incline toward the liquid holding pan, and the catch tray being spaced vertically and laterally away from the nip between the transfer cylinder and the metering roller to thereby provide an open space between the holding pan and the catch tray. A reservoir is positioned below the open space and below the nip for receiving coating liquid from the catch tray and the nip, and for receiving coating liquid overflowing from the holding pan.

Abstract: An improved roll coating apparatus and method includes a coating roll having a smooth surface for applying a resist, a doctor roll having grooves on its surface for supplying prescribed amount of the resist to the coating roll, and a back up roll which is in contact with the coating roll for conveying a substrate on which the resist is applied to a prescribed direction. Even if there are minute concave portions on the surface of the substrate, the resist is forced to fill the minute concave portions, since the resist is pressed and forced to be applied on the substrate by the coating roll having smooth surface and the back up roll.

Abstract: In a device for applying fluid substances in printing and coating machines, carrying plates are fixed to ends of a carrying beam. The carrying plates have recesses therein in which pivot axles of a coating roller are loosely and rotatably mounted. Stopping surfaces are provided to limit lateral movement of the coating roller by abutting with its pivot axles. The stopping surfaces are formed adjacent the recesses formed in the carrying plates and converge in the direction in which a fabric strip which is to be printed on is moved beneath the roller.

Abstract: A squeegee device for applying a substance to a web (5) of material comprising a magnetically attracted squeegee roller (6), a bar (1) along which the roller (6) extends, lateral guide members (3) for the roller (6), whereby the bar (1) is resiliently deformable in a plane parallel to said web (5) and in a plane normal to said web (5) and to said roller (6), and whereby the bar (1) is shorter than said roller (6).

Abstract: A roll coating apparatus for applying a coating liquid having a high viscosity at a normal temperature, to a surface of a substrate, including a device for feeding the substrate, a coating roll rotatably provided in contact with the fed substrate, and a doctor for regulating the coating liquid adhering to the coating roll to a prescribed amount. Respective axial lines of the coating roll and the doctor are inclined with a prescribed angle with respect to the horizontal plane and a coating liquid supply device is provided at the highest position thereof. The coating liquid supplied at the highest end of the coating roll adheres to the surface of the coating roll. The quantity thereof is controlled by the doctor. The coating liquid flows downward on the surface of the coating roll due to its weight and rotation of the coating roll. Accordingly, the coating liquid on the surface of the coating roll is constantly renewed and no irregularities occur to the density of the liquid.

Abstract: A varnish scraper is fitted to a varnish applicator roller to scrape off extra varnish which has remained after the varnish has been supplied to a blanket drum. The scraped extra varnish is circulated to a varnish vessel for re-using.

Abstract: A device for automatically controlling coating amount for use in a coating machine including a backup roll, an applicator roll, a pickup roll, a base, a first table slidably mounted on the base and a second table slidably mounted on the first table. The device includes first and second pressure adjusting mechanisms for adjusting a pressure between the backup roll and the applicator roll and a pressure between the applicator roll and the pickup roll. Each of the first and second pressure adjusting mechanisms further includes a sensor, a stepping motor and a precision ball bearing screw member.

Abstract: In order to apply a product to a support (10) a transfer cylinder (1) with a checkered surface is used with an applicator cylinder (3). The applicator cylinder (3) consists at least in part of a magnetizable material, is not mounted on an axle, rotates on the transfer cylinder (1) and can move in relation to the point of application.

Abstract: An offset lithographic printing method and machine having a plurality of in-line liquid application stations, at least one of which is an ink image-printing station for printing lithographic ink images on a suitable receptive copy sheet, and at least the final downstream liquid-application station is a coating application station for printing a protective, and/or aesthetic coating over selected portions of, or over the entire ink image-printed surface of the copy sheet. The present method and apparatus involves the placement of a drying station between liquid application stations to evaporate volatile solvent or vehicle from the ink images and/or to solidify the liquid coating applied at upstream stations before the application of a continuous or spot coating thereover at the next downstream coating station.

Abstract: A convertible coating apparatus provides one or two side coating of a web having wet ink thereon to permit both printing and coating to be carried out prior to any drying operation. The apparatus includes a coating applicator roller in contact with a relatively hard back-up roller. The coating applicator roller is supplied with coating in both the one and two side operations while the back-up roller is supplied with coating only in the two side operation. Water is supplied to the back-up roller in the one side operation and the back-up roller has a hydrophilic surface which, when supplied with water, repels the wet ink on the web passing through the couple and prevents smudging and offset of the ink to the back-up roller. A method of carrying out the one and two side coating is also disclosed. A turning roller is also provided which guides the freshly inked web between inking operations without smudging the ink on the web.

Abstract: A retractable coater is used on-line with the last unit of a standard offset lithographic printing press. The coater includes a coating assembly mounted on a platform and a retraction guide assembly, the latter comprising:(i) a horizontal member and means for slidably supporting platform movement along the horizontal member;(ii) a vertical member slidably guiding vertical movement of the platform and(iii) means for slidably lifting the platform and coating metering assembly on a course guided by the vertical member.

Abstract: A varnishing apparatus for a printed sheet includes: a metering roller, to a peripheral surface of which a varnish from a varnish duct is transferred; a form roller which is brought into contact with a downstream side of the metering roller and is rotated in the same direction as that of the metering roller to allow transfer of the varnish from the metering roller; and a rubber blanket cylinder which is brought into contact with a downstream side of the form roller and is rotated in a direction opposite to that of the form roller to allow transfer of the varnish from the form roller, the rubber blanket cylinder having a notch on its outer peripheral portion and transferring the varnish onto a sheet which is in contact with its peripheral surface. The surface of the metering roller is formed of an elastic material having a roughened surface.