Typewriting machines – Means auxiliary to typewriting function – Attachment for illuminating or viewing
Patent
1987-03-16
1989-03-21
Wiecking, David A.
Typewriting machines
Means auxiliary to typewriting function
Attachment for illuminating or viewing
B41J 2918
Patent
active
048137987
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a lighting arrangement for typewriters or printers, comprising a light shade member arranged above the printing or typing mechanism well.
Typewriters and printers are quite generally subject to the requirement that they should be as quiet as possible in operation. While the walls of the casing of the typewriter or printer hold the sound back in a satisfactory manner and additional insulating steps can possibly be taken, the printing mechanism well or cavity which contains the paper feed arrangement with roller and guide rollers as well as a carriage with the printing mechanism represents a large sound-radiating opening. To provide a sound damping effect, that opening is usually closed by means of a transparent cover or shield of plastic material, for example acrylic glass. However, in that case reflection phenomena frequenty occur, which not only make it difficult to look into the arrangement but which can also cause troublesome reflections. Therefore, a pivotable light shade member of opaque plastic material or metal is generally additionally disposed above the covered typing mechanism well or cavity, wherein the light shade member can be adjusted in such a way as substantially to avoid reflection phenomena. Nonetheless it is generally difficult to have a view into the printing mechanism well so that reading of the typed text and following the progress of the typing operation are impeded. A similar situation also applies in regard to printers.
Attempts have already been made to improve the viewing situation in the printing mechanism well by mounting lamps in the printing mechanism well itself. In that respect however the angle of lighting is unfavourable so that the paper guide members throw shadows on to the paper precisely at the location where a free view is desired. In addition, there is only a very small amount of space available in the typing mechanism well so that it is not possible to dispose effective lighting therein. Lighting using a movable lamp which stands beside or behind the typewriter or printer also does not provide acceptable results because in most cases it is not possible to find a position of adjustment in which good lighting is achieved without the lamp itself impairing the view.
Accordingly, the object of the present invention is to provide a lighting arrangement for typewriters or printers, which in a simple manner provides for good lighting in the typing mechanism well, without itself constituting a nuisance.
To attain that object, the invention takes as its basic starting point a lighting arrangement of the kind set forth in the opening part of this specification, and is characterised in that arranged on the light shade member is an elongate lighting member which radiates light on to the typing area and which is shaded towards the eyes of the operator. When adjusting the light shade member, it is then possible at the same time to adjust the lighting effect and it is possible to provide that the material being typed is well lit without reflection and in such a manner as to be kind to the eyes. That is essentially also due to the fact that the lighting is effected from an area above the angle of view. As a result of that, the arrangement also does not produce any shadows from parts of the typing mechanism.
Further developments of the invention are the subject-matter of the subsidiary claims. Thus, the lighting member may be a fluorescent tube which is arranged in a tube of opaque material, wherein the tube has a light exit window directed towards the typing area. In that case only the typing area is lit and no dazzle phenomena occur. The use of a fluorescent tube gives the advantage that the amount of heat generated is small and the lighting arrangement causes scarely any nuisance because of the small diameter of commerically available fluorescent tubes. The tube is advantageously mounted rotatably about its axis so that the light exit window which is desirably in the form of a longitudinal slot can be conveniently adjusted. The lighting member is mounted
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