Card – picture – or sign exhibiting – Changing exhibitor – Shiftable display item or item support
Patent
1986-07-11
1988-11-15
Mancene, Gene
Card, picture, or sign exhibiting
Changing exhibitor
Shiftable display item or item support
40490, 40513, G09F 1130
Patent
active
047839198
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for the cyclic rearrangement of a pile of sheets. Devices of this type are known from the following U.S. Pat. Nos. 4,238,898, 4,238,899, 4,241,528, 4,245,417, 5,259,802 and 4,376,348.
The known devices, here and in the following usually referred to as "sheet changers" or "picture changers", comprise a first frame part, for example a housing provided with a viewing window, and a second frame part, for example a slider member that can be pulled out of and pushed back into the housing parallel to the plane of the viewing window. The frame parts contain a changeover mechanism which may be one of a wide variety of constructions; the effect of the changeover mechanism is to remove a sheet from one end of a pile, for example that end remote from the window pane, when the frame parts are pulled away from each other, and return it to the other end of the pile when the frame parts are pushed together, that is, in the case given by way of example, to that end of the pile facing the viewing window. During this operation, either when the frame parts are pulled away from each other or when they are pushed together, the uppermost sheet of the pile in the case concerned executes a movement relative to the window.
If the sheets are photographic prints, their surface is relatively rough; in addition, dust may also be deposited on them. As long as a viewing window made of mineral glass is used this does not present any problems; since, however, picture changers of this type are intended for mass production and are to be manufactured at a favourable price from injection-moulded plastics components, a plastics material, for example acrylic resin, is also preferred for the window. In this case, without additional measures the inner side of the window, even after a relatively small number of picture-change operations, becomes so very scratched that it is practically impossible to see through.
In the above-mentioned U.S. Pat. No. 4,376,348, therefore, means are disclosed which are intended to ensure that, at least during the relative movement between the uppermost sheet in the pile and the viewing window, a safety spacing is maintained between the two. These means comprise holding-down members which overlap the edges of the pile that extend parallel to the direction of withdrawal of the slider member.
Photographic prints are not only rough but also, owing to their physico-chemical properties, almost never flat but generally bowed or warped. There is consequently a risk that, in spite of the mentioned holding-down members, contact may still occur in some areas between the picture and the window, for instance in the central plane of symmetry of the window, so that a mat channel forms there.
The problem of the invention is to provide a device of the type mentioned at the beginning in which this risk is eliminated without the spacing between the picture and the window being enlarged to a very great extent, because this would be both uneconomic and less aesthetic.
This problem is solved in accordance with the invention by a device for the cyclic rearrangement of a pile of rectangular sheets, especially photographic prints, with a first and a second frame part, of which one has a viewing window in front of a principal face of the pile, which frame parts can be pulled away from each other and pushed back together again parallel to this plane, and with means for removing a sheet from one end of the pile when the frame parts are pulled away from each other and for adding this sheet to the other end of the pile when the frame parts are pushed together, and with means which are provided on the frame part movable relative to the window and which hold the sheet that faces the window, at least during its movement relative to the window, spaced from the window, by overlapping the sheet edges that extend transversely to the direction of movement.
As described in the following explanation of examples of execution, the design of the means is such that the actual sheet changeover operation is not interfered with, t
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Hakomaki J.
Jackson Robert R.
Licinvest AG
Mancene Gene
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