Printing – Planographic – Bed-and-cylinder machines
Patent
1988-06-21
1989-10-17
Crowder, Clifford D.
Printing
Planographic
Bed-and-cylinder machines
101252, 101366, 101425, 101451, B41F 334
Patent
active
048739243
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
TECHNICAL FIELD
This invention relates to a flat-bed press which is provided in its press body frame with a table on which the materials to be printed are placed, and a feeder for supplying a material to be printed to a paper bed, or, in addition, a delivery adapted to discharge a printed material from the feeder and capable of keeping a plurality of printed materials on itself, and more particularly to a flat-bed press used as a proof press, and a flat-bed press capable of carrying out the multicolor printing and usable not only as a proof press but also as a running-on printing press; and a flat-bed printing method.
BACKGROUND ART
In general, in plate-making and printing operations, before the regular printing called a running-on has been done, a proof printing is done so as to examine a printing plate obtained by a plate-making operation and to obtain a standard printed material for a running-on operation.
Since the proof printing is done for the purpose of examining a standard printed material for a running-on operation, it is desirable that the proof printing be done under the conditions close to those for the running-on. Namely it is preferable that the proof printing be done by using a printing machine for running-on. However, the construction of a printing machine for running-on is not convenient for carrying out an operation for printing a small quantity of materials, such as a proof printing operation. Due to the necessity of operating a printing machine efficiently, the proof printing is done by a proof printing machine, i.e. a proofing press, such as a flat-bed planographic press.
In general, in a flat-bed press, such as a proof press, printing is one by moving a carriage, which includes an ink roller, a dampening roller and a blanket, on a press body frame provided with a plate bed, a paper bed, a dampening unit disposed at one end of the frame, and a swingable roller (rider roller) disposed at the other end of the frame for use in applying ink to an inking unit or an ink roller.
In a proof printing operation or a running-on operation for printing a small quantity of materials, which is carried out by a conventional flat-bed press, such as a proof press, an operator feeds materials to be printed, such as paper piece by piece by hand onto a paper bed, and push the materials, which are thus fed, lightly by the tips of his fingers so as to drive the materials to a front guide or a side guide, i.e., the feeding of the materials is done physically.
When one lot of materials to be printed consists of around 10-20 pieces of paper, they may be fed manually by an operator without much trouble. However, when the number of pieces of paper to be printed is large, it becomes very difficult to feed the paper with a high efficiency in a short period of time.
In a printing operation by a conventional, flat-bed press, such as a proof press, grippers holding the printed material on a paper bed are opened by an operator's foot pedal stepping operation, and the printed material is then taken up by hand. When the operator then removes his foot from the foot pedal, the grippers are closed to complete the paper discharging operation. This operation temporarily stops the printing process and cause a loss of time.
In a conventional printing machine, the printed material are thus taken out one by one by hand from the paper bed, i.e., by an inefficient method.
When one lot of printed materials consist of around 10-20 pieces of paper, they may be discharged manually by an operator without much trouble. However, when the number of pieces of printed paper is large, it becomes very difficult to discharge the printed paper with a high efficiency in a short period of time.
In a flat-bed press, such as a proof press, the monochromatic printing is generally done. In order to carry out a multicolor printing operation by using this printing machine, the printing is done initially in a first color, and the operation of the printing machine is then stopped, the printing machine being then washed. A printing opera
REFERENCES:
patent: 4555989 (1985-12-01), Marass et al.
Abe Hidetoshi
Nonomura Tsutomu
Crowder Clifford D.
Toyo Ink Manufacturing Co. Ltd.
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