Card – picture – or sign exhibiting – Changing exhibitor – Shiftable display item or item support
Patent
1988-01-27
1989-08-29
Murtagh, John E.
Card, picture, or sign exhibiting
Changing exhibitor
Shiftable display item or item support
40490, 40511, G09F 1130
Patent
active
048604739
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for the cyclic rearrangement of a pile of rectangular or square sheets, or a so-called "picture-changer".
2. Description of the Related Art
Picture changers are known from U.S. Patent Specifications 4,238,898, 4,238,899, 4,241,528, 4,241,529, 4,245,417, 4,259,802 and 4,376,348. These specifications are all based on the principle that a pile of pictures, especially photographic prints, is held by two frame parts that are movable relative to one another, one of which may have a viewing window. During each complete cycle of movement of the frame parts, that is, pulling them fully away from each other and sliding them fully back together again, one picture is removed from one end of the pile and returned to the other end of the pile again. The picture changers have the following components for this:
A feeding means feeds pictures to a separating means; the separating means detaches an individual picture from the pile; a retaining means holds the individual picture separated from the pile in one of the frame parts whilst the remainder of the pile is held in the other frame part; a guide means guides the separated individual picture such that it goes onto the other end of the remainder of the pile.
The known picture-changers use one and the same element both as feeding means and also as retaining means for the individual picture, but owing to the different functions this is less advantageous than using a separate system for each of the functions mentioned.
The aim of the present invention is to provide a retaining means which is especially well adapted to the difficulties associated therewith. That is, where photographs are concerned, the edge of the sheet being separated (which comes free behind the separating means) may, on the one hand, be warped and bowed owing to the thin material and, on the other hand, due to the physical and chemical properties of the photographic papers, require especially strong separating forces.
SUMMARY OF THE INVENTION
According to the invention, there is proposed for solving this problem a device for the cyclic rearrangement of a pile of rectangular or square sheets, especially a pile of photographic prints, said device being provided with a first and a second frame part which may be moved relative to one another and parallel to the main plane of the pile, and with means that, on movement of the frame parts backwards and forwards, remove an individual sheet from one end of the pile and add it to the other end of the pile again, these means comprising: part and the remainder of the pile in the other frame part, and purpose of returning it to the other end of the remainder of the pile, arrangement which is arranged, in the direction of movement, after the separating means and the holding and releasing movements of which can be controlled by the relative movement of the frame parts. Accordingly, use is made, in advantageous manner, of the fact that after the separating means the leading edge of the separated sheet is accessible on all sides and can therefore be held firmly for the transfer even of large forces. This firm holding has proved secure even when the edge is warped and bowed and ensures that no slipping can occur in the plane of the sheet. A further advantage is that, considered spatially, the feed system can be arranged on one side of the separating means and the retaining system on the other side so that no problem can arise from the fact that a component forming simultaneously the feeding and retaining means has to "cross through" the separating means.
It should be noted that, in addition to this actual function, the retaining means according to the invention may also assume at least some of the functions of the guide means. For example, it can secure the individual picture in its position at least during a portion of the return movement of the frame parts, so that, for example, it cannot rotate in its own plane.
Embodiments of the subject of the invention are explained in detail b
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Jackson Robert R.
Licinvest AG
Murtagh John E.
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