Card – picture – or sign exhibiting – Changing exhibitor – Shiftable display item or item support
Patent
1989-08-14
1991-10-29
Dorner, Kenneth J.
Card, picture, or sign exhibiting
Changing exhibitor
Shiftable display item or item support
40490, 40511, G09F 1130
Patent
active
050604082
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for the cyclic rearrangement of a pile of substantially rectangular sheets of nominally identical thickness.
Such a device, which here and hereinafter shall be referred to as a "sheet-changer" for short, is described and illustrated in publications WO 86/03019, WO 86/03018, WO 86/03022, WP 86/03026, WO 86/03028, WO 86/03029, WO 86,03030, which are hereby incorporated by reference in their entirety.
The known device comprises a housing provided with a viewing window and forming the first frame part, and a slider member forming the second frame part. The separating elements are formed on the one hand by a step which is arranged fixedly in the housing, and on the other hand by an inner transverse member of the slider member called the separator. The feeding means comprises free ends of hook-like construction of springs mounted in the housing, which engage the edges of the sheet lying furthest away from the step. The individual sheet is held in the housing in that in the housing there are fixedly arranged retentive coatings extending in the direction of movement of the slider member, against which retentive coatings the individual sheet is pressed by small rollers mounted on the separator. The separator also serves as a retaining means for holding the remainder of the pile in the slider member. The guide means comprises the free ends of spring arms mounted in the housing that lift the individual sheet away from the retentive coatings when the slider member is pulled and guide it in front of a return slot defined by the separator. The pressing device too is formed by the free ends of spring arms mounted in the housing, namely by a pair of springs of the feeding means and a pair of spring arms forming the guide means. The spring arms are respectively controlled, released and depressed by these springs for given portions of the relative movement of the slider member.
With the slider member inserted, the pile rests on ledges of the slider member parallel with the viewing window, the ledges defining a level which is closer to the viewing window than that of the retentive coatings so that the pile is spaced from the retentive coatings on reinsertion of the slider member. Furthermore, the separator is designed such that, as the slider member is withdrawn, it is not possible for one or more sheets to be separated from the remainder of the pile in addition to the separated individual sheet. Reference should be made to the content of the said publications for further details.
The known picture changer gives no cause for complaint as regards its function. However, it is in need of improvement in two areas:
Firstly, a large number of functional elements are provided, which have to be manufactured separately and the correct co-operation of which cannot be determined until they are assembled. Secondly, the control of the spring functions by the slider member causes variable friction conditions over the withdrawal path, which the user is able to feel clearly.
It is the aim of the invention to develop a sheet changer whose manufacture is simplified and at the same time the relative movement of the frame parts can take place with essentially the same or at least very gradually variable and minimal friction over the withdrawal path.
This problem is solved by the invention described below.
This concept offers a whole series of advantages:
Whereas in the known sheet changer the control of the spring functions is effected by the slider member running onto these springs, in the construction according to the invention the rail elements can be anchored by or released at one end at fixed housing parts. The rail elements may furthermore have integrally moulded elements which co-operate with the separator to prevent the separation of a second sheet from the remainder of the pile. Projections, which serve as feeding means, may also be integrally moulded with the rails. The retentive coatings can be arranged on the rails, as can the means for holding the remainder of the pile away from the retentive coati
REFERENCES:
patent: 3783540 (1974-01-01), Barclay
patent: 4245417 (1981-01-01), Ackeret
patent: 4266834 (1981-05-01), Ackeret
patent: 4376348 (1983-03-01), Ackeret
patent: 4458434 (1984-07-01), Ackeret
patent: 4759142 (1988-07-01), Ackeret
Dorner Kenneth J.
Hakomaki J.
Ingerman Jeffrey H.
Licinvest AG
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