A water fountain contamination prevention device (4) scrapes water and ink off a water supply roller (17 to 19) using a blade (22, 23) over a conveyance surface (21) on the water supply roller (17 to 19) from a plate cylinder (5) to a water fountain (16). The water and the ink are collected from the blade (22, 23) into a catchment pipe (24, 60) and discharged, and the water and the ink are suctioned from the blade (22, 23) by means of a suction pump (26). Contamination of dampening water in the water fountain (16) is prevented, and printing quality is stabilized.
Provided is an ink fountain device including: a base; a plate; a back-and-forth movement mechanism that moves the plate back and forth along the back-and-forth movement direction; and a thin board that is placed on the base, has a plurality of holes each accommodating a ball, and has a thickness smaller than the diameter of the ball. The plate is placed on the thin board and is supported by the balls.
An ink fountain of an ink fountain device is provided with: a fixed frame; a plate provided on an upper surface of the frame so as to be freely slidable; and an advancing/retreating mechanism that advances/retreats the plate with respect to the frame. The advancing/retreating mechanism is provided with: a motor; a cam that is fixed to an output shaft of the motor, rotates integrally with the output shaft, and has a cam surface shifted from a perfect circle; and a rod that advances/retreats in contact with the cam surface. The plate advances/retreats with respect to the frame as the rod advances/retreats.
For a printer ductor roller (2), an electromagnetic valve (10) protection member (14), which is oil resistant, engages with a shaft (8), and covers the edges of housings (13) with cylindrical or arc-shaped covers, is held in the space between individual ductor rollers (12). The protection member (14) does not require replacement, discharges printer cleaning liquid along valleys, and prevents contamination of the electromagnetic valve with the cleaning liquid.
This ink supplying device for a printer moves an individual ductor roller between an ink fountain roller and a distributing roller with air pressure. A plurality of the individual ductor rollers are arranged in line on a fixed shaft, and the fixed shaft is provided with an air supplying pipe, electromagnetic valves that move the individual ductor rollers toward the ink fountain roller with air from the air supplying pipe, and springs that move the individual ductor rollers back toward the distributing roller. A controller turns on the electromagnetic valves in order from the far end side of the air supplying pipe to the inlet side thereof, and in this order moves the individual ductor rollers toward the ink fountain roller.
In this printing machine, an ink reservoir is formed between an ink fountain and an ink fountain roller, and then ink is supplied to a plate cylinder via a ductor roller that is capable of moving forward and backward with respect to the ink fountain roller. The printing machine is provided with: a base which supports the ink fountain; the ink fountain; a slide mechanism which controls a gap between the tip of the ink fountain and the ink fountain roller by sliding the ink fountain along the base; a cleaner which removes ink from the ink fountain roller; a forward/backward motion mechanism which moves the cleaner back and forth between a position at which the cleaner comes into contact with the ink fountain roller and a non-contact position; and a controller. The controller performs control on the slide mechanism and the forward/backward motion mechanism, expands the gap so as to allow both ink and impurities therein to pass through the gap, and brings the cleaner into contact with the ink fountain roller to remove the ink and impurities therein from the roller.
In the present invention, when an individual graph data set is denoted by gr, an initial value thereof is denoted by gri, an average of graph data sets in the whole of a ductor roller is denoted by g, and an initial value thereof is denoted by gi, graph data sets gr and g are corrected during printing so as to eliminate errors between a printing density and a target density. When a stabilization value of the average graph data set g is denoted by ge, and a stabilization value of the individual graph data set gr is denoted by gre, data sets including the initial values gi, gri and the stabilization values ge, gre are collected. A base parameter B is increased or decreased on the basis of the difference, in the collected data sets, between the distribution of the stabilization value ge and the distribution of the initial value gi. The collected data sets are divided on the basis of each printing speed, and, with respect to a speed parameter V, a speed parameter V for each division is increased or decreased, on the basis of the difference, in each division of the graph data set g, between the distribution of the stabilization value ge and the distribution of the initial value gi. The collected data sets are divided on the basis of the average graph data set g, and an area parameter F for each g division is increased or decreased on the basis of the difference, in each g division, between the distribution of the stabilization value ge and the distribution of the initial value gi. A roller parameter R of a corresponding individual roller is increased or decreased on the basis of the difference, in the individual graph data set, between the distribution of the stabilization value gre and the distribution of the initial value gri. The duty ratio of the ductor roller is corrected on the basis of each parameter value.
A plate cylinder driving device of a printing machine is provided with: a driving shaft for a plate cylinder; a driving helical gear fixed to the driving shaft; and an anti-backlash helical gear rotatably attached to the driving shaft and urged by a spring in an anti-backlash direction. Both the driving helical gear and the anti-backlash helical gear mesh with a main gear, and a plate provided with a plurality of holes each accommodating a roller is arranged between the anti-backlash helical gear and the driving helical gear. Friction between an anti-backlash gear and a driving gear in a plate cylinder driving device of a printing machine is reduced by a simple mechanism.
Provided is a method for correcting printing misalignment in a printing apparatus for performing registration using printing misalignment test marks, the method being capable of improving registration precision and correcting printing misalignment thereof with good precision. An image-processing device has a printing misalignment value-measuring means for measuring a misalignment value with respect to a set position for a printing misalignment test mark printed on an object being printed. A printing misalignment test mark A is an open circle and the printing misalignment value-measuring means measures the misalignment value with respect to the set position using the white portion W of the printing misalignment test mark A.
B41F 33/00 - Indicating, counting, warning, control or safety devices
B41F 17/22 - Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles or material, or on articles with cylindrical surfaces on articles of finite length on articles of uniform cross-section, e.g. pencils, rulers, resistors by rolling contact
Provided is an ink supply device for a printer that does not require hand-cleaning even when ink remains in the gaps between adjacent ink-feeding segment rollers. The ink supply device is provided with an ink-feeding segment roller cleaning unit 7 that is provided with a cleaning roller 21, the outside of which is covered with a cleaning fabric 26 and which has an axis parallel to the axis of the multiple ink-feeding segment rollers 4. The ink-feeding segment roller cleaning unit 7 wipes off ink adhering to the circumference of the end face of each ink-feeding segment roller 4 as a result of the cleaning roller 21 being pressed against the multiple ink-feeding segment rollers 4 and the cleaning fabric 26 entering between adjacent ink-feeding segment rollers 4.
Provided is a dampening water device for a printer with which the number of prints from the start of printing until printing stabilizes can be reduced. The dampening water device is provided with a cooling device 27 for supplying cooling water into a hollow chrome roller 25. The cooling device 27 is provided with a water supply pipe 31 inserted inside the chrome roller 25, a pump 32 for delivering the cooling water to the water supply pipe 31, and a flow rate-adjusting valve 34 for adjusting the flow rate of the cooling water.
A dampening water amount adjustment apparatus 40 is provided with a plurality of air supply boxes 41 arranged side by side in an axial direction of a water transfer roller 8, each of the air supply boxes 41 forming an air blowing part. The air supply boxes 41 have a substantially U-shaped air passage 67 that causes air inside an air supply chamber 57 to pass along an outer peripheral surface of the water transfer roller 8 and be fed into an air exhaust chamber 60. A valve mechanism 44 that increases and decreases the amount of air is provided midway along the air passage 67.
This can printing apparatus (1) is provided with: a main printer (2) which is provided with a plurality of printing cylinders (47) for printing different colours, and which prints on the side surfaces of cans; a secondary printer (6) which performs additional printing on the side surfaces of the cans after printing by the main printer (2) has been performed; and a can inspection machine (5) for inspecting the printing state. The can inspection machine (5) is provided with: a can rotation device (51) for rotating the cans (C); a can imaging device (52) for capturing images of the cans (C); and an image processing device (53) for processing the captured images. The secondary printer (6) is provided with: a printing head (6a) which faces the side surfaces of the cans held in the can rotation device (51) of the can inspection machine (5); and a processing unit which issues printing instructions to the printing head (6a) on the basis of a preset printing pattern and processing data from the image processing device (53) of the can inspection machine (5).
B41F 17/22 - Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles or material, or on articles with cylindrical surfaces on articles of finite length on articles of uniform cross-section, e.g. pencils, rulers, resistors by rolling contact
B41F 33/00 - Indicating, counting, warning, control or safety devices
Provided is an ink supply device for a printer, the device making microadjustment of density by an operator unnecessary and being capable of accurately supplying ink in the amount appropriate for obtaining a desired density. The control unit (34) of the ink supply device is provided with: a predicted density-calculating means (53) for determining, from the densities measured for a specified number of printed objects, the density predicted when the density has stabilized; a graph shift-calculating means (54) for determining the graph shift using the predicted density and the target density; and a control graph value-calculating means (55) for determining, from a previously set graph value and the graph shift, a control graph value for controlling the rotation angle.
Provided is a can-printing apparatus equipped with a can inspection device capable of density and printing deviation measurements necessary for improving the printing precision of the printer. An image-processing unit (53) for processing an image that has been photographed is provided with: an image inspection means (54) for comparing a can with a master image using an image of the whole can taken with a first camera to check whether the can is printed correctly; a density measurement means (55) for measuring the density of each color at designated positions similarly using the image of the whole can taken with the first camera; and a printing deviation measurement means (56) for measuring, using an image of the open end of the can taken with a second camera, deviations with respect to positions set for printing deviation inspection marks printed for each color on the open end of the can.
B41F 17/22 - Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles or material, or on articles with cylindrical surfaces on articles of finite length on articles of uniform cross-section, e.g. pencils, rulers, resistors by rolling contact
B41F 31/14 - Applications of messenger or other moving transfer rollers
B41F 33/14 - Automatic control of tripping devices by feelers, photoelectric devices, pneumatic devices, or other detectors
G01N 21/88 - Investigating the presence of flaws, defects or contamination
G01N 21/89 - Investigating the presence of flaws, defects or contamination in moving material, e.g. paper, textiles
G01N 21/90 - Investigating the presence of flaws, defects or contamination in a container or its contents
G01N 21/956 - Inspecting patterns on the surface of objects
16.
PRINTING PLATE UNIT, PLATE CYLINDER DEVICE AND PRINTING PLATE UNIT AUTOMATIC ATTACHMENT DEVICE FOR PRINTER
A printing plate unit automatic attachment device (81) is provided with the following: a pressing member (96) that is inserted from an opening part (33) for pressing member insertion and that presses an inner slider (36) in opposition to the impelling force of a printing plate connection member impelling device (35); a holding means (94) that holds and releases a printing plate unit (1) by holding and releasing a projecting part (11a) which serves as a gripping part provided at the printing plate unit (1); and a driving device (92) that causes the holding means (94) to move in a plate drive shaft axial-direction.
A backlash of a driving side helical gear and a driven side helical gear is eliminated, and a rotation of a driven side gear member is smoothed, to increase rotation accuracy of a plate cylinder. A plate cylinder driving device (3) is provided with a plate cylinder driving shaft (5), the driven side gear member (7) which has the driven side helical gear (6) engaged with the driving side helical gear (1) and is attached around the plate cylinder driving shaft (5), a position adjustment member (11) which causes the driven side gear member (7) to move to be fixed to a predetermined position, a baffle member (9) attached to the plate cylinder driving shaft (5), a nipping member (10) which fixes the baffle member (9) to the driven side gear member (7) so as to be attachable and detachable, a backlash removal helical gear (8) disposed on one side of the driven side helical gear (6), a first spring (44) which causes the backlash removal helical gear (8) to be press-contacted to the driven side helical gear (6), and a second spring (46) which biases the backlash removal helical gear (8) so as to rotate in a predetermined direction.
B41F 13/14 - Registering devices with means for displacing the cylinders
F16H 1/08 - Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with parallel axes the members having helical, herring-bone, or like teeth
F16H 55/18 - Special devices for taking-up backlash
A printer enabling the easy control of the temperature of a plate cylinder part, simply set up, and capable of easily maintaining the quality of printing during continuous printing. In the printer, a plate is installed on the outer periphery of the plate cylinder part (12) fixedly installed on a plate drive shaft (1). A temperature-controlled fluid is circulated in the plate cylinder part (12).
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