Sheet feeding or delivering – Feeding – By means to convey sheet
Patent
1990-08-24
1991-09-03
Schacher, Richard A.
Sheet feeding or delivering
Feeding
By means to convey sheet
271314, B65H 506
Patent
active
050446240
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a bearing arrangement for a pressure roller for conveying recording media in a printer means which includes wall parts in which the pressure roller equipped with an elastically deformable surface is axially defined with rolling bearings in two bearing locations and pressing in a radial direction against a conveyor drum with given pressing power.
In order to move recording media, for example single sheets, along a prescribed conveying path in printer equipment, pairs of rollers arranged following one another in the conveying path are frequently utilized as conveyor means, these pairs of rollers being composed of a driven conveyor drum and of an idling pressure roller that presses against the conveyor drum with a given pressing power. One of the two rollers, preferably the pressure roller, has its surface coated with an elastically deformable material in order to be able to intercept tolerances at a given pressing power and in order to uniformly seize the recording medium that runs through between the pair of rollers.
One of the critical problems has thus already been addressed. The pairing of the rollers must be fashioned such that the recording media are reliably seized and conveyed; as warranted, recording media having different material properties, for example different grades of paper having different paper weights, must thereby also be capable of being reliably processed. This is only possible when a given, radial pressing power with which the pressure roller presses against the conveyor drum takes effect in circumferential and axial direction with optimum uniformity.
The roller pairs are often arranged relatively inaccessibly. They should therefore be mounted such insofar as possible that repair or maintenance work is nonetheless easy to carry out. Thus, for example, the pressure rollers that are sensitive because of their elastic surface must be easily replaceable and without special tools insofar as possible, since maintenance work in most instances is carried out at the end user's premises. For space reasons, a mounting and dismantling from side, for example proceeding from the front side of the printer equipment, must be possible for both bearing locations of the roller pairs arranged in wall parts of the printer equipment.
A plurality of such roller pairs are employed in the course of a conveying path in printing equipment, for which reason the bearing structures for the roller pairs in the wall parts must be fashioned as simply as possible for cost reasons, must be composed of few parts, and must be constructed insensitive to tolerances, so that no complicated adjustment work is necessary for assembly. For tolerance reasons, the two bearing location have been differently designed, particularly for the pressure roller. One of the two bearing location forms a fixed bearing that clearly fixes the pressure roller in an axial direction in the respective wall part. The other bearing location, by contrast, is fashioned as a movable bearing in order to intercept manufacture-induced tolerances but also in order to intercept tolerances that are produced by temperature influences during ongoing operations. Despite these different, patly contrary demands, a high operating reliability is particularly desired in order to obtain acceptable maintenance intervals.
It is therefore the object of the present invention to create a bearing arrangement of the species initially cited that, given optimally simple structure having essentially the same structural parts, allows the bearing arrangement to be used both as a movable bearing as well as a fixed bearing, that is simple to assemble and that is insensitive to tolerances in a radial as well as in an axial direction.
In a bearing arrangement of the species initially cited, this object is inventively achieved by one of the rolling bearings at both bearing locations being arranged fixed in an identically fashioned bearing housing that comprises self-holding securing elements for axially fixing the bearing housing in a recess of the allocat
REFERENCES:
patent: 3151551 (1964-10-01), Dutro
patent: 3205815 (1965-09-01), Liessem
patent: 3721188 (1973-03-01), Jacobsen
patent: 4431180 (1984-02-01), Nakajima
patent: 4461212 (1984-07-01), Geney
patent: 4850584 (1989-07-01), Watashi
Haus Rainer
Polzer Karl-Heinz
Schacher Richard A,.
Siemens Aktiengesellschaft
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