DE521939C - Device for securing the position of plates in photographic cassettes - Google Patents

Description

The invention relates to cassettes for photographic plates in which the the latter, for the purpose of releasable retention in the focal plane, by suspension be pushed lengthways under retaining strips, rags, etc.

This type of cassette has had the disadvantage that the disk as a result from vibrations to which it was directly or indirectly exposed while wearing, etc., the suspension compressed in such a way that the disk was pushed through the focus springs of the cassette insert that pressed against its rear surface, with its upper edge forward, through the exposure opening of the cassette through to was pressed against the rear surface of the cassette slider. This had the consequence that the Pulling out the latter and exposing the cassette exposure opening through the aforesaid Feather the plate even more forward and tilted with its top edge placed in front of the insertion channel of the cassette slide or even in the The camera frame opening swiveled in. But that was the closing of the cassette by the slider or the It is impossible to pull them out of their guides on the camera body.

These inconveniences are eliminated by the invention in that the exposure aperture the cassette closing the cassette slide also through to the light-sensitive Plate protruding parts (bevels, lugs o. The like.) Pressing acts on the plate, so that this, the cassette rear wall shifting or pivoting towards itself, brought under increased tension to the focus springs of the cassette insert becomes, while when pulling out the cassette slide, the support is automatic into its normal position under the stop provided for securing in the focal plane returns.

Three exemplary embodiments of the invention are shown graphically, namely Fig. 1 shows a front view of the cassette with a plate indicated in dashed lines and a cassette slide with a nose-shaped bulge towards the inside of the cassette, Fig. 2 a section through Fig. 1 in line AA on an enlarged scale, Fig 3, as a second embodiment, a part of the cassette in perspective with springs along the inner surface of the cassette insert bend serving as a disk system, which bear bevels which protrude beyond the bend towards the cassette slide, and Fig. 4 shows a third embodiment, also shown in perspective. in which the bend itself is designed as a spring provided with a sliding lug.

To Figure 1 and 2

The photosensitive plate α is inserted into the cassette housing b in a known manner by pressing the fingers of the person loading the cassette against the upper edge a ^{1 of} the plate, the lower edge et? the

Ends c ^{1 of} the spring c depresses and thus gives the latter increased tension. The jerk surface presses α · ³ of the panel in itself reinforcing manner against the resilient tongues d ^1, the cartridge insert d, until the upper part of the front surface α ⁴ of the plate α, the situation has been reached, that, c by the spring pressed upwards, behind the surface d ^{2 of} the angled Φ of the cassette insert d ίο pushes as soon as the plate or. released by the inserter's fingers.

Once this has happened, the cassette slide e is pushed down in its guide c ^1. A nose e- directed towards the inside of the cassette lies with its inclined surface e ³ pressing against the edge a ^{1 of} the plate and pushes it gradually backwards (Fig. 2), at the same time the tension of the resilient tongues d ^{1 of} the insert is substantial increasing.

As a result, the unintentional change in position of the plate in its longitudinal direction due to impact, etc., increases resistance opposite.

When the cassette slide is pulled out, the plate automatically enters its secured position Position in the focal plane back.

To Figure 3

Instead of the nose e ^{2 of} the cassette slide e , which is directed towards the interior of the cassette, this nose is mounted on a spring f . This is located on the inner surface d ^{2 of} the bend cP of the cassette insert d. The nose e ^{2 reaches} through the bend and protrudes over its surface. d * before, so that the cassette slide e occurs with its front edge e ⁵ on its incline e ° as soon as the cassette is closed and the nose presses the spring end f ¹ against the plate »and thus presses it towards the inside of the cassette.

To Figure 4

The bend d ³ is itself designed as a spring f , which is drawn at its outer end / ¹ , the cassette slide e , so that it has a nose-like design, on whose curved surface e ^e the slide end / ^{1 presses.}

Claims (3)

Patent claims: ι. Photographic cassette, characterized in that the one which closes the exposure opening of the cassette Cassette pusher also through protruding to the light-sensitive plate Parts (bevels, noses, etc.) acting on the plate in a pressing manner. 2. Cassette according to claim 1, characterized in that the cassette slide (e) itself has one or more of the plate (α) to be directed, projecting, advantageously formed by bulges of the cassette slide (e) parts (lugs or the like.) (E ² ) owns. 3. Cassette according to claim i, characterized in that the cassette insert (d) springs (/). carries or forms itself, which have protrusions (e ² ) that cooperate with the cassette slide (e) . 1 sheet of drawings