Ink feed device with vibrating rollers

Printing – Inkers – Roller

Reexamination Certificate

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Details

C101SDIG029

Reexamination Certificate

active

06422144

ABSTRACT:

TECHNICAL FIELD
The present invention relates to inking arrangements for use in printing presses, and more particularly to an inking arrangement for printing presses which comprises a fountain roller, a distributing roller and a plurality of vibrating rollers divided axially of the rollers and arranged therebetween, the vibrating rollers being individually switchable back and forth between two positions between the fountain roller and the distributing roller so as to differ in the mode of contact thereof with these two rollers alternately.
BACKGROUND ART
For use printing presses, inking arrangements of such type are already known wherein each vibrating roller is rotatably attached to the movable ends of pivotal arms, and the pivotal arms are moved as by pneumatic cylinder or like means to switch the vibrating roller back and forth between a first position where the roller is in contact with the fountain roller and away from the distributing roller and a second position where the roller is in contact with the distributing roller and away from the fountain roller.
However, the conventional inking arrangement described requires pairs of pivotal arms for switching the vibrating rollers between the two positions to result in the problem of necessitating a great installation space.
To solve this problem, an inking arrangement is proposed which comprises a support member in the form of a rectangular pipe and disposed in parallel to a fountain roller and a distributing roller, a plurality of short cylindrical movable members fitted around the support member, each of the movable members being formed with a rectangular bore having the support member inserted therethrough with a clearance provided in the direction of one width of the support member, vibrating rollers rotatably mounted on the respective movable members externally thereof, and change-over devices provided on the support member and positioned between the support member and the respective movable members for moving the movable member in the above-mentioned direction of width of the support member, each by an electromagnet and a spring, to switch the vibrating rollers individually between different positions. (see JP-A No. 38160/1985).
With this arrangement, the position of the movable member is changed by energizing or deenergizing the coil of the electromagnet of the change-over device. When the coil of the electromagnet is not energized, the movable member is located in the first position by the biasing force of the spring, while when the coil is energized, the movable member is shifted to the second position by the magnetic drive force of the electromagnet.
The arrangement nevertheless has a problem attributable to the generation of heat of the electromagnet of the change-over device as will be described below. The spring has a considerably great biasing force since the spring moves a considerably great portion comprising the movable member and the vibrating roller to press the vibrating roller into contact with the fountain roller or distributing roller. A great magnetic drive force is required of the electromagnet because the electromagnet is adapted to press the vibrating roller into contact with the distributing roller or fountain roller by moving the great portion against the biasing force of the spring. Accordingly, a sufficient drive force is not available unless the electromagnet is large-sized, and an increase in the size of the electromagnet makes the change-over device greater in size. Although the coil of the electromagnet generates a large quantity of heat, the electromagnet is disposed in the support member inside the bore of the movable member and is therefore unable to dissipate the heat, greatly raising the temperature of the electromagnet and the support member. This entails the likelihood that the coil of the electromagnet will be thermally damaged, or the support member will expand thermally, no longer permitting the movable member to move smoothly relative to the support member. It is necessary to provide a cooling device to preclude this drawback, whereas the change-over device then becomes complex in construction and greater in size.
Accordingly, the foregoing publication proposes an arrangement which comprises a plurality of movable members each in the form of a short hollow cylinder and fitted around a support member in the form of a round tube so as to be movable along one diametrical direction of the support member, and a change-over device comprising a cylinder provided inside the support member and having a piston in the cylinder portion, and a spring. The movable members are movable along the diametrical direction of the support member, each by the piston and the spring, to switch the vibration rollers individually between different positions.
With this arrangement, the movable member is switched between the different positions by controlling the supply of air to the cylinder portion of the change-over device with a switching valve. When no air is supplied to the cylinder portion, the movable member is switched to the first of the positions by the biasing force of the spring, while when air is supplied to the cylinder portion, the movable member is switched to the second of the positions by the biasing force of the piston.
As will be described below, however, this arrangement has the problem that the change-over device is composed of a large number of parts, difficult to assemble and cumbersome to maintain, requires a large installation space, great air consumption and a prolonged response time in changing the position of the vibration roller. Stated more specifically, aside from the support member, each ink transfer roller requires one cylinder, and also piping between the cylinder and each switching valve and piping between each switching valve and a compressed air source, hence an increased number of parts. Also required are work for mounting the cylinders in the interior of the support member, work for piping between each cylinder and each switching valve, work for the piping between the switching valve and the compressed air source, difficult assembling work and cumbersome maintenance work. The switching valves are arranged externally of the support member since it is impossible to provide the valves inside the support member which has in its interior the cylinders and the piping between the compressed air source and the cylinders. Accordingly there is a need to provide a large space for the installation of the switching valves externally of the ink transfer rollers. This requires elongated piping between the cylinders provided inside the support member and the switching valves arranged outside the support member, consequently necessitating greatly increased air consumption when air is supplied to each cylinder portion and an increased period of time until the piston actually moves the movable member after the switching valve is controlled, i.e., a prolonged response time in changing the position of the ink transfer roller. Further because the distance between the cylinder and the switching valve generally differs from cylinder to cylinder, the length of the piping differs from cylinder to cylinder if the piping is installed in the usual manner, with the result that the response time in changing the position of the ink transfer roller varies from roller to roller. To avoid this, the pipes between the cylinders and the respective switching valves need to have equal lengths, whereas it is then necessary to give each pipe the same length as the longest pipe to entail a need for correspondingly excessive piping and additional installation space.
Accordingly, we have proposed an inking arrangement which comprises a support member in the form of a prism, movable members each having a groove extending over the entire length thereof and formed in a surface thereof slidable in contact with the support member and defining a rectangular bore, and switching valves each positioned in the groove and mounted on the support member on the surface thereof facing the groove of the movable member, the supp

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