Photocopying – Contact printing – Light boxes
Patent
1995-04-21
1996-07-09
Beatty, Robert
Photocopying
Contact printing
Light boxes
118 60, G03G 1520
Patent
active
055349862
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates:to a separating agent metering device for supplying separating agent to the surface of a fuser roller of a printer or copier operating by a transfer-printing method.
A separating agent metering device of the conventional type is disclosed in U.S. Pat. No. 3,964,431. Such a separating agent metering device contains a separating agent feed roller which rolls tangentially against the fuser roller and, during this process, applies liquid separating agent to the surface of the fuser roller.
It has been shown that particularly the separating agent feed roller of a heat-and-pressure fusing device undergoes severe abrasion during operation and therefore has to be exchanged regularly. This frequent exchange is greatly disadvantageous especially since a heat-and-pressure fusing device has an operating temperature of about 200.degree. C. This causes, on the one hand, the high degree of wear and, on the other hand, a long waiting time until the parts to be exchanged have cooled down to the extent that they can be changed. The exchange of the parts is frequently so complicated and time-consuming that additionally a specially trained service engineer has to be called to carry out this work. Experience has further shown that additional costs occur due to the fact that parts to be exchanged are misplaced or damaged by being dropped.
Separating agent feed rollers are usually exchanged completely when their surface has become soiled or damaged. In doing so, valuable parts which are not yet worn, for example heat-resistant bearings which are a constituent part of the separating agent feed roller, are generally also disposed of. The new part to be used is therefore comparatively expensive. The present invention is therefore based on the object of designing the separating agent metering device for supplying separating agent to the surface of a fuser roller of a printer or copier operating by the transfer-printing method in such a way that parts subject to wear can be exchanged in a simple manner, have a long service life, are functionally reliable and cost-effective.
SUMMARY OF THE INVENTION
According to the invention, this object is achieved by providing a separating agent metering device for supplying a separating agent to a surface of a fuser roller of a transfer-printing apparatus. The metering device includes a separating agent metering tube with at least one separating agent metering opening arranged on its longitudinal extent. A carrier tube is rotatably mounted on the separating agent metering tube with a plurality of circumferentially positioned passage openings for the separating agent to pass through. A replaceable applicator roller, which is exchangeable after suffering wear, is axially slidable over the carrier tube. The applicator roller has an applicator sleeve which receives the carrier tube and a plurality of passage openings for allowing flow of the separating agent therethrough. The passage openings are at least partially congruent with the passage openings in the carrier tube. A layer of material which is permeable by the separating agent is attached to the outer circumference of the applicator sleeve to apply the separating agent to the fuser roller.
An advantage of the present invention is that, during servicing, the entire separating agent feed roller including the bearing and carrier tube does not have to be exchanged, but only the applicator roller which can be slid axially over the carrier tube and the wear of which is particularly great due to the direct contact with the fuser roller.
According to the invention, the carrier tube is rotatably mounted on a separating agent metering tube with axially arranged separating agent metering openings. Provided in the carrier tube and in an applicator sleeve of the applicator roller are passage openings for the separating agent in the carrier tube and passage openings for the separating agent in the applicator sleeve, which passage openings are at least partially congruent with one another. The separating ag
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Irro Otmar
Naeser Helmut
Beatty Robert
Siemens Nixdorf Informationssysteme Aktiengesellschaft
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