Photocopying – Projection printing and copying cameras – Detailed holder for original
Patent
1989-10-05
1991-10-08
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Detailed holder for original
355 91, 355 93, G03B 2762
Patent
active
050558730
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a reprographic apparatus comprising a copyboard for holding a document to be exposed in a flat position in an exposure plane, said copyboard including a support plate defining the exposure plane, a glass or otherwise transparent plate arranged above said plate and being pivotally connected therewith along one side edge, and a releasable hold-down mechanism to lock the glass plate in an operative position in which it holds the document in pressurized contact with the support plate.
Such an apparatus is known for instance from the EP 0 085 862. After the document has been placed in the exposure plane between the two plates of the reprographic apparatus, a hold-down mechanism (or lock) presses the transparent plate against the document on the support plate, and air still present between the two plates can be extracted by suction in order to achieve a flat exposure position of the document. The lock is provided with an extension to overcome spring forces when unloading an original.
A disadvantage of the described system is that it can only handle documents with a size smaller than that of the transparent plate as, otherwise, the hold-down mechanism would damage or destruct the document.
It is therefore an object of this invention to provide a reprographic apparatus comprising a copyboard without the above described disadvantage. For this purpose a reprographic apparatus according to the invention is characterized in that the hold-down mechanism can be brought into a second position in which it is completely below the explosure plane. With such an apparatus even documents of a large size compared to the transparent plate may be reproduced because it is possible to expose a document part-by part without any risk of damaging the remainder of the document, since it has surprisingly appeared that the large size document can be held sufficiently flat for exposure by the weight of the transparent plate, without the hold-down mechanism.
In a preferred embodiment the hold-down mechanism comprises a movable pressure bar that extends parallel to the pivotally connected side edge of the glass plate along the opposite side thereof, the bar being provided at its ends with side plates, which are displaceably and rotatably connected to a housing of the support plate, and that said bar is provided with a locking mechanism.
Other particulars and advantages of the apparatus according to the invention will be apparent from the following description with reference to the drawings, wherein
FIG. 1 is a schematic perspective view of a first, relatively simple embodiment of the apparatus according to the invention,
FIG. 2 a similar view of a second preferred embodiment,
FIG. 3 a side view of the second embodiment with the copyboard in a first or operative position,
FIG. 4 a similar view with the copyboard in a second or released position, and
FIG. 5 again a similar view with the transparent plate of the copyboard in a third or open position.
The copyboard shown in FIG. 1 comprises a housing 26 which carries a support plate 19 consisting of a transparent flexible material, e.g. acrylic plastic. The glass plate 22 rests in a first position on the support plate 19 and pivotally connected with the support plate 19 along its rear side edge 21. A hold-down mechanism consisting of two hinged elements 16, 17 are capable of engaging the front side edge of the glass plate 22 to hold the glass plate in its first position in pressure contact with the support plate 19. The hinged elements 16 and 17 may, as shown for element 17, be retracted from engagement with the glass plate 22 and turned to a position completely below the support plate 19 to allow nondamaging reproduction of an original exceeding the size of the glass plate 22.
The copyboard shown in FIG. 2 comprises a housing 26', a support plate 19' and a pivotally mounted glass plate 22' in the same way as in FIG. 1. The hold-down mechanism comprises a bar 20 connected with side-plates 23, 24 which are supported for pivotal movement around an axis 25. The bar 20 is p
REFERENCES:
patent: 563888 (1896-07-01), Sack
patent: 1315882 (1919-09-01), Sweigard
patent: 1742372 (1930-01-01), Taylor
patent: 3420608 (1969-01-01), Canale
patent: 3995955 (1976-12-01), Topfer
patent: 4536085 (1985-08-01), Hliboki et al.
Hayes Monroe H.
Helioprint A/S
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