Printing – Cleaning attachments
Reexamination Certificate
1999-03-15
2001-05-29
Hilten, John S. (Department: 2854)
Printing
Cleaning attachments
C101S423000
Reexamination Certificate
active
06237492
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The invention relates to a cleaning device for a printing press, having a cloth spindle formed with a slot or a longitudinal groove, a cleaning cloth clampable in the slot, and a clamping body rotatable inside the slot.
Cleaning devices of the foregoing general type are used for cleaning printing ink and other contaminants from rollers, cylinders and drums.
In the published European Patent Document EP 07 95 402 A1, a cylinder cleaning device of this type is described having a cloth spindle formed with a variable circumference. In accordance with one embodiment thereof, a bar that firmly clamps the cleaning cloth to the bottom of a trench formed in the cloth spindle can have an oval cross section and can be embodied so as to be rotatable from a clamping position into a released position in order to undo the clamping. Rotating the bar out of the released position and into the clamping position for the purpose of firmly clamping the cleaning cloth is neither contemplated nor, for structural reasons, possible in this arrangement. On the contrary, this heretofore known arrangement requires that the cleaning cloth be wound in multiple layers around the bar, that is located partly in the trench and partly protruding therefrom, in order to achieve firm clamping. The cloth spindle is unsuited for use as a clean cloth spindle because, when the end of the cloth is reached, the required cloth tension is lost, and the bar falls out of the trench. If the cloth spindle is used as a dirty cloth spindle, all of the cleaning cloth cannot be optimally used, because a relatively long section thereof always remains unused for producing the clamping needed for cleaning purposes. Furthermore, it is not possible to wind the cloth uniformly onto the bar, because the bar protruding from the trench very severely deforms the winding layers at some locations thereof.
A washing device is also described in German Utility Model DE 297 06 836 U1, but it does not match the general type of washing or cleaning device described at the introduction hereto, and the spindle of this prior art device has a slot or longitudinal groove wherein an end of a washcloth is clamped in place by a clamping or lug strip. The clamping strip is not constructed so as to be rotatable inside the longitudinal groove. Although this heretofore known washing device does permit a more exact fastening of the washcloth to the spindle than if adhesive tapes are used, nevertheless the clamping is insecure. Depending upon the nature of the washcloth that is clamped in place, either the washcloth can slip out of the clamped condition, or the resilient clamping strip can snap or spring out of the clamping position. This risk is especially great when a relatively major tensile force is applied to the washcloth. Such a tensile force acts upon the washcloth after the end of the winding is reached when the cloth has been unwound. The washcloth torn out of the clamped condition thereof can be pulled into the printing press and cause severe damage.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a cleaning device in a printing press wherein the cleaning cloth can be used up quite well, is quickly clampable and reliably clamped.
With the foregoing and other objects in view, there is provided, in accordance with the invention, a cleaning device in a printing press, having a cloth spindle formed with a longitudinal groove, and a cleaning cloth clampable in the longitudinal groove, comprising a clamping body rotatable inside the longitudinal groove out of a first position, wherein clamping of the cleaning cloth is undone, and into a second position, wherein the cleaning cloth is clamped between the clamping body and an inner face defining the longitudinal groove.
In accordance with another feature of the invention, the clamping body, due to the rotation thereof out of the first position and into the second position, is wedgable in the longitudinal groove so as to clamp the cleaning cloth therein.
In accordance with a further feature of the invention, the first position of the clamping body is substantially perpendicular to the second position thereof.
In accordance with an added feature of the invention, the longitudinal groove has a cross section narrowing towards the outside relative to the cloth spindle.
In accordance with an additional feature of the invention, the cross section of the longitudinal groove is narrowed in an infinitely graduated manner towards the outside.
In accordance with yet another feature of the invention, the clamping body is formed with two mutually opposite convex clamping faces.
In accordance with yet a further feature of the invention, the clamping body has a first dimension measurement and a second dimension measurement extending perpendicularly to a pivot axis of the clamping body and in different directions relative to one another, the first dimension measurement being greater than the second dimension measurement.
In accordance with yet an added feature of the invention, the clamping body has a circular cross section with two flat faces disposed opposite one another, the first dimension measurement being the diameter of the circular cross section, and the second dimension measurement being a maximum spacing of the flat faces from one another.
In accordance with yet an additional feature of the invention, the cleaning device includes at least one restraint device for preventing unintended undoing of the clamping of the cleaning cloth and for securing the clamping body against displacement.
In accordance with still another feature of the invention, the clamping body has a rigid structure.
In accordance with still a further feature of the invention, the longitudinal groove and the clamping body are profiled so that the cleaning cloth wrapped around the clamping body is firmly clamped along two clamping lines extending parallel to one another, between the clamping body in the clamping position, and the longitudinal groove.
In accordance with still an added feature of the invention, the clamping body in the clamping position is located entirely inside the longitudinal groove.
In accordance with still an additional feature of the invention, there is provided a printing press, comprising in combination therewith at least one cleaning device having at least some of the foregoing features.
In accordance with a concomitant feature of the invention, there is provided a rotary printing press, comprising in combination therewith at least one cleaning device having at least some of the foregoing features.
Thus, there is provided a cleaning device for a printing press, having a cloth spindle formed with a longitudinal groove or slot, having a cleaning cloth that can be clamped in the longitudinal groove, and having a clamping body that is rotatable inside the longitudinal groove, wherein the clamping body is rotatable inside the longitudinal groove out of a first position and into a second position, the clamping of the cleaning cloth being undone in the first position, and the second position being the clamping position, wherein the cleaning cloth is clamped between the clamping body and the longitudinal groove.
In contrast with the resiliently embodied clamping strip in the washing device of the prior art described hereinabove, the cleaning cloth can be securely clamped in place by the adjustably embodied clamping bodies according to the invention. By an adjusting device disposed perpendicularly to the axial direction of the cloth spindle, both fast release of clamping and fast clamping of the cleaning cloth can be achieved. By constructing the clamping body so that it is rotatable about the pivot axis thereof for adjustment into the clamping position within the longitudinal groove, simple adjustment kinematics and a structurally uncomplicated embodiment of the device are possible.
In an embodiment that advantageously refines the device according to the invention, the clamping body, by the rotation thereof out of the first position and into the second
Konig Werner
Sitzmann Bernd
Greenberg Laurence A.
Heidelberger Druckmaschinen Aktiengesellschaft
Hilten John S.
Lerner Herbert L.
Nguyen Anthony H.
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