摘要:
A non-contact web guide includes a wall having a curved exterior surface and a hollow interior containing a pressurized liquid. A first row of liquid ejection holes is provided in proximity to the web guide entry position having axes that are inclined toward a downstream direction, and a second row of liquid ejection holes is provided in proximity to the web guide exit position having axes that are inclined toward an upstream direction. An intermediate array of liquid ejection holes is optionally provided. The pressurized liquid flows through the liquid ejection holes to force the web of media away from the bearing surface of the web guide. This configuration of liquid ejection holes provides the advantage that stable web guidance is achieved at low liquid flow rates.
摘要:
An inking system for use in transferring ink to a gravure printing surface in a gravure printing system includes a gravure cylinder r having a printing zone located between first and second recessed bearing contact zones. A radius of the recessed bearing contact zones is less than a radius of the printing zone by at least 0.100 inches. An ink tray includes a floor and first and second end walls. Bearings are mounted outside of the end walls which engage with the first and second bearing contact zones, respectively, thereby positioning the ink tray assembly in a specified position relative to the gravure cylinder. Upper edges of the end walls extend into the recessed bearing contact zones.
摘要:
An image forming device includes at least two image cylinders that rotate with a time varying velocity; at least two image cylinder gears respectively attached to each image cylinder; and at least one pinion gear that drives the at least two image cylinder gears. The time varying velocity of the image cylinder gear is due to a runout of the pinion gear. The spacing between the centers of the image cylinders is determined by S 12 = k π D p + α 360 π D p where S12 is the distance between the centers of the two image cylinders gears; k is an integer; α is the angle between the pitch point of the two gears; and Dp is the diameter of the pinion gear.
摘要:
A web transport system for transporting a web of media along a web transport path in an in-track direction, including a liquid application system for applying a liquid to at least one surface of the web of media. An air skive is positioned along the web transport path downstream of the liquid application system, wherein the air skive directs one or more streams of air onto the web of media thereby removing at least some of the liquid that is being carried along with the web of media. A vapor source adds a vapor into the one or more streams of air provided by the air skive before the one or more streams of air are directed onto the web of media.
摘要:
A system for generating a response curve for adjusting the positions of a pair of adjustable edge seals to the width of a print medium in a printing system is disclosed. The system comprises a vacuum chamber connected to a vacuum source, which provides vacuum to the vacuum chamber. Spaced sealing rollers and edge seals define an opening in the vacuum chamber. A sensor measures a vacuum level in the vacuum chamber. A controller is used to produce signals indicative of an activation level or a vacuum level. Means for adjusting the position of the edge seals are used to reposition the edge seals to at least one new position. The controller produces signals indicative of an activation level or a vacuum level at the new positions. A response curve is produced using the signals produced at the first and new positions.
摘要:
A method for generating a response curve for adjusting the positions of a pair of adjustable edge seals to the width of a print medium in a printing system is disclosed. The method comprises defining a vacuum chamber and using a vacuum source to provide vacuum in the vacuum chamber. Spaced sealing rollers and the edge seals define an opening in the vacuum chamber. Signals indicative of an activation level of the vacuum source or the vacuum level in the vacuum chamber are produced for the first position. The edge seals are moved to at least one new position. Signals indicative of the activation level of the vacuum source and the vacuum level in the vacuum chamber are produced for the new positions. A controller is used to produce a response curve using the first or second signals produced at the first and new positions.
摘要:
Apparatus for causing a vacuum force to be applied across a width of a print medium as it moves through a printing system and for determining whether the edge seals are positioned correctly is disclosed. A vacuum chamber is connected to a vacuum source which provides vacuum to the vacuum chamber. Spaced sealing rollers and the edge seals define an opening in the vacuum chamber, wherein the print medium passes over the opening and is guided by the sealing rollers. A sensor measures a vacuum level in the vacuum chamber. A controller stores a plurality of response curves for different known print media, produces first and second signals indicative of an activation level of the vacuum source and the vacuum level in the vacuum chamber, and compares the first and second signal to appropriate response curves to produce an error signal indicating whether the edge seals are correctly positioned.
摘要:
A method for applying vacuum force across a width of a web of movable print medium as it moves through a printing system and determining if positions of a pair of adjustable edge seals do not correspond to the width of the movable print medium is disclosed. The method comprises defining a vacuum chamber and using a vacuum source to provide vacuum in the vacuum chamber. Sealing rollers and the adjustable edge seals define an opening in the vacuum chamber. Appropriate response curves from a plurality of response curves for different known print media are selected. First and second signals indicative of the activation level of the vacuum source and the vacuum level in the vacuum chamber are produced. The signals are compared to the response curves to produce an error signal indicating whether the position of the edge seals corresponds to the width of the print medium.
摘要:
An inking system for use in transferring ink to a flexographic printing plate in a flexographic printing system includes an anilox member having an ink transfer zone located between first and second recessed bearing contact zones. A radius of the recessed bearing contact zones is less than a radius of the ink transfer zone by at least 0.100 inches. An ink tray includes a floor and first and second end walls. Bearings are mounted outside of the end walls which engage with the first and second bearing contact zones, respectively, thereby positioning the ink tray assembly in a specified position relative to the anilox member. Upper edges of the end walls extend into the recessed bearing contact zones.
摘要:
A non-contact web guide includes a wall having a curved exterior surface and a hollow interior containing a pressurized liquid. A first row of liquid ejection holes is provided in proximity to the web guide entry position, second and third rows of liquid ejection holes is provided in proximity to the web guide exit position, and an intermediate array of liquid ejection holes is provided between the first and second rows. A total number of liquid ejection holes in the intermediate array is less than a total number of liquid ejection holes in the second row. This configuration of ejection boles provides the advantage that stable web guidance is achieved at low liquid flow rates.