An ink fountain of an ink fountain device is provided with a fixed frame; a plate slidable on the upper surface of the plate; and an advancement and retraction mechanism advancing and retracting the plate with respect to the frame. The advancement and retraction mechanism comprises: a motor; a cam fixed to the output shaft of the motor which is integrally rotatable by rotation of the output shaft and has a cam surface shifted from an exact circle; and a rod in contact with the cam surface and advancing and retracting by the cam. The plate advances and retracts with respect to the frame by the advancement and retraction of the rod.
A ductor roller for printing machines has a shaft provided with an air supply pipe, plural individual ductor rollers, and plural electromagnetic valves, both connected to the shaft. The individual ductor rollers advance pneumatically by the electromagnetic valves. The individual ductor rollers have housings that are associated with the shaft and configured to move forward and backward; roller members configured to contact with the ink fountain roller and an ink distribution roller; and bearings connecting the roller members to the housings. The electromagnetic valves are placed in the housings. Protection members for the electromagnetic valves are oil-resistant, have circularly cylindrical or arc-like covers, and are associated with the shaft. They cover the side ends of the housings and are placed in the clearance between the individual ductor rollers. The protection members do not need an exchange, discharge cleaning liquid for printing machines along troughs and prevent the electromagnetic valves from being contaminated by the cleaning liquid.
An ink fountain device having a base; a plate; an advancing and retracting mechanism for advancing and retracting the plate along an advancing and retracting direction; and a thin sheet arranged on the base which has plural holes accommodating balls and is thinner in thickness than a diameter of the balls. The plate is arranged over the thin sheet and supported by the balls.
Plate cylinder driving devices of a printing machine are provided with a drive shaft driving the plate cylinder, a drive helical gear fixed to the drive shaft, and an anti-backlash helical gear rotatably connected to the drive shaft and is biased by at least a spring towards a direction for preventing backlash. Both the drive helical gear and the anti-backlash helical gear are engaged with the main gear, and a plate provided with plural holes accommodating rollers is provided between the drive helical gear and the anti-backlash helical gear. Friction between the anti-backlash gear and the drive gear is reduced by a simple mechanism in the plate cylinder driving devices in a printing machine.
A printing machine has an ink fountain, a fountain roller in contact with the ink fountain, a ductor roller, at least an ink transfer roller and a controller configured and programmed to control the ductor roller. For the printing machine, individual graph data gr and its initial values gri, and average g of the graph data over the entire ductor roller and its initial value gi are used to change graph data gr and g during printing so as to cancel errors between measured printed densities and desired printed densities. An adjustment apparatus and method also achieve this task for such a printing machine.
Provided is a method of correcting printing misalignment in a printing apparatus that performs registration by using a printing misalignment inspection mark. This method is capable of improving registration accuracy and is capable of correcting the printing misalignment with higher accuracy. An image processor has printing misalignment value measurement means that measures a misalignment value with respect to a set position of the printing misalignment inspection mark that has been printed on an object. A printing misalignment inspection mark A is a hollow circle that is white inside, and the printing misalignment value measurement means measures the misalignment value with respect to the set position by using a white portion W of the printing misalignment inspection mark A.
A can inspection device includes a rotation device rotating cans, an imaging device taking images of rotating cans, and an image processor processing taken images. The imaging device includes a first camera taking an image of an entire can and a second camera taking an image of an opening-side end portion of the can. The image processor includes an image inspection means for inspecting whether printing is performed properly as compared with a master image by using the image taken by the first camera, a density measurement means for measuring densities in designated positions for respective colors by using the image taken by the first camera, and a printing misalignment value measurement means for measuring misalignment values with respect to set positions of printing misalignment inspection marks printed on the opening-side end portion of the can for respective colors by using the image taken by the second camera.
G01N 21/952 - Inspecting the exterior surface of cylindrical bodies or wires
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
B41J 3/407 - Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
B41F 31/12 - Applications of feed or duct rollers adjustable for regulating supply
B41F 31/14 - Applications of messenger or other moving transfer rollers
B41F 33/00 - Indicating, counting, warning, control or safety devices
B41F 13/14 - Registering devices with means for displacing the cylinders
G01N 21/956 - Inspecting patterns on the surface of objects
G01N 21/90 - Investigating the presence of flaws, defects or contamination in a container or its contents
B41M 5/00 - Duplicating or marking methods; Sheet materials for use therein
B41F 33/00 - Indicating, counting, warning, control or safety devices
B41F 19/00 - Apparatus or machines for carrying out printing operations combined with other operations
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
B41M 1/40 - Printing on bodies of particular shapes
B41J 3/44 - Typewriters or selective printing mechanisms having dual functions or combined with, or coupled to, apparatus performing other functions
B41J 3/407 - Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
B41J 3/42 - Two or more complete typewriters coupled for simultaneous operation
An image processor 53 processing taken images includes an image inspection means 54 for inspecting whether printing is performed properly as compared with a master image by using the image of the entire can taken by a first camera, a density measurement means 55 for measuring densities in designated positions for respective colors also by using the image of the entire can taken by the first camera, and a printing misalignment value measurement means 56 for measuring misalignment values with respect to set positions of printing misalignment inspection marks printed on an opening-side end portion of a can for respective colors by using the image of the opening-side end portion of the can taken by the second camera.
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
G01N 21/88 - Investigating the presence of flaws, defects or contamination
B41J 3/407 - Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
B41F 33/00 - Indicating, counting, warning, control or safety devices
B41F 31/12 - Applications of feed or duct rollers adjustable for regulating supply
B41F 31/14 - Applications of messenger or other moving transfer rollers
B41F 13/14 - Registering devices with means for displacing the cylinders
G01N 21/90 - Investigating the presence of flaws, defects or contamination in a container or its contents
10.
Printing plate unit, plate cylinder apparatus for printer, and printing plate unit automatic mounting apparatus
a provided on the printing plate unit 1 and configured to serve as a gripping portion; and a drive apparatus 92 configured to move the retaining means 94 in an axial direction of a plate drive shaft.
Provided is an ink supply device for a printing machine which can accurately supply a quantity of ink necessary for acquiring desired concentration while making the fine adjustment of concentration of ink by an operator unnecessary. A control device 34 of the ink supply device includes: a concentration prediction value calculation means 53 which acquires a concentration prediction value when the concentration becomes stable based on concentration measured values of a predetermined number of printed matters; a graph change value calculation means 54 which acquires a graph change value using the concentration prediction value and a concentration target value; and a control graph value calculation means 55 which acquires a control graph value for controlling a rotational angle based on a preset set graph value and the graph change value.
An ink supply unit is a unitized member having a casing accommodating components therein. A plurality of plate cylinders are arranged in a circumferential direction at predetermined intervals. The ink supply unit corresponding to the plate cylinder is disposed on a radially outer side of the plate cylinder. The ink supply unit can move between an operation position in which ink can be supplied to the plate cylinder and a standby position located further to a radially outer side than the operation position.
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 31/02 - Ducts, containers, supply or metering devices
B41F 31/30 - Arrangements for tripping, lifting, adjusting, or removing inking rollers; Supports, bearings, or forks therefor
B41F 31/22 - Inking arrangements or devices for inking from interior of cylinder
The present invention eliminates backlash between a drive helical gear and a driven helical gear and facilitates rotation of a driven gear member to increase rotational accuracy of a plate cylinder. A plate cylinder drive unit includes a plate cylinder drive shaft, a driven gear member having a driven helical gear that meshes with a drive helical gear and attached around the plate cylinder drive shaft, a position adjustment member moving the driven gear member to fix it at a predetermined position, a whirl-stop member attached to the plate cylinder drive shaft, a sandwiching member removably fixing the whirl-stop member to the driven gear member, a backlash eliminating helical gear disposed on one side of the driven helical gear, first springs bringing the backlash eliminating helical gear in pressure-contact with the driven helical gear, and second springs biasing the backlash eliminating helical gear to rotate it in a predetermined direction.
The present invention provides a printer which can facilitate temperature control of a machine-plate cylinder section, can allow simple setup, and can facilitate maintenance of printing quality in continuous printing. In the printer, a machine plate is mounted on the outer circumference of a machine-plate cylinder section 12 fixedly provided on a machine-plate drive shaft 1. A fluid whose temperature is regulated is circulated in the machine-plate cylinder section 12.
B41F 23/04 - Devices for treating the surfaces of sheets, webs or other articles in connection with printing by heat drying, by cooling, by applying powders
B41F 13/22 - Means for cooling or heating forme or impression cylinders
B41F 27/12 - Devices for attaching printing elements or formes to supports for attaching flexible printing formes
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