JPS60170838A - Combination of mandrel and core for supporting roll of photosensitive material in camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Large commercial cameras often use rolls of photosensitive material for imaging. The light beam is guided from the roll to the image plane of the camera and is emitted by the light from the object to be copied, which passes through the camera lens. The photosensitive material is moved by rollers that guide it to the exposure position. When handling photosensitive material, it is important to ensure that it is not deflected or biased as it is advanced through the camera. It is also important to position the photosensitive material so that its longitudinal axis coincides with the longitudinal center line of the image plane of the camera.

Many cameras use rolls of photosensitive material of different widths for different imaging purposes. With prior art devices, changing from one width to another requires a camera change of 11 degrees.
It is necessary to adjust or center the body.

Accordingly, one object of the present invention is to provide a mandrel and core silk combination for a photosensitive roll used in a large camera.

Another object of the present invention is to provide a mandrel and core combination that properly axially aligns the photosensitive side within a camera.

One objective of the present invention is to provide a mandrel and core combination that allows for easy and reliable use of rolls of different photosensitive side widths in large cameras.

A further object of the present invention is to provide a simple and inexpensive structure for loading and aligning rolls of photosensitive material within a camera.

The mandrel and core combination of the present invention consists of a hollow mandrel journalled within the camera for receiving the photosensitive roll 7 and an elongated hollow core to receive the hollow core. The mandrel is provided with a spring-loaded detent located midway between its ends, which detent projects through the mandrel wall (r) and into a complementary slot provided in the core wall. A slot in the core is positioned midway between the ends of the core and, when engaged by the detent, centers the core with respect to the mandrel, whatever its length.

In the accompanying drawings, which constitute a part of this specification, similar parts are designated by the same U symbol.

Referring to the drawings, reference numeral 10 denotes a mandrel and core assembly having an elongated hollow inner cylindrical core 11 and elongated hollow tubular mandrels 12 and 7. show.

The outer diameter of the mandrel 12 is sized to support the inner surface of the core freely around it.

Core 11 may be made of any suitable hard material such as glass, compressed paper or metal. Preferably, mandrel 12 is made of metal such as aluminum or steel. core 11
is of sufficient length to receive an elongate strip 7 on the photosensitive side, such as a web of paper coated with any of the known crystallizing materials used in photography. The elongated strip is wound onto core 11 to form a roll as indicated by dashed lines 1 in FIGS. 1 and 2. The length of core 11 is preferably the same as the width of roll 16, but may be longer or shorter if desired.

A rectangular slot 16 is positioned very precisely in the middle between the ends 14, 1.5 of the core 1''1.

The side walls 17 and 18 of this slot are equally spaced from the core centerline 19. The slot 16 can be used as a tribute to the core body as shown in the figure, and if the core has a considerable amount of Jtll, the slot 16 can be used as a slot)! The upper end of the structure may be closed by a gate wall (not shown). The mandrel 12 is a short shirt releasably fixed in a camera bearing (not shown) in a conventional manner.
0.21 (the mandrel must be positioned within the camera so that its centerline coincides with the longitudinal centerline of the image plane, that is, the optical axis). . The short shaft 20°21 is the first
It may be integral with the end caps 22, 2 as shown in FIG. End caps 22.23iz are force fit onto mandrel 12. It can be seen from FIG. 2 that the end caps 22, 2 have the same outer diameter 7 as the mandrel 12, so that the core 11 can be slid past one of the end caps onto the outer surface of the mandrel 12. It will be appreciated that it is important to accurately position the 5° mandrel 12 within the camera to accurately position the detent 2B (described in detail below). To properly orient the mandrel 12, the short sleeves 20 and 21 are of different diameters to fit into a suitable camera bearing socket (not shown).

A second rectangular slot 24 is formed on the mandrel 1 as shown.
20 is cut through the main body. second slot 24
Also, the side walls 25 and 26 are the center of the -ry drell 12!
fM, that is, positioning is performed accurately so as to be equidistant from the optical axis 27 (see FIG. 1).

A shell detent 2B is provided within the second slot 24;
This detent is pressed outwardly of the slot by a sheet spring 29 which is fixed at one end 60 to the inner wall 1 of the mandrel 12. The detent 2B is provided with opposite flat sides, which sides 17 of the slot 16 of the core.
．． 18 thereby positioning and fixing the core on the longitudinal axis of the camera, ie the longitudinal optical axis of the camera.

The detent 28 is also formed with an inclined surface 29 on its outer or upper surface, as shown in detail in FIGS. 6 and 4.

The higher portion of the ramp 29 extending into the slot 16 of the core 11 is oriented opposite to the direction of travel of the photoreceptor. In this way, detent 28 prevents rotation of core 11 relative to the mandrel during use.

From the above explanation, if it is desired to place the roll of photosensitive material precisely on the center line of the camera so that it fits inside the camera, an operator should remove the mandrel 12 from the camera and use the spring-loaded detent 28 Geman 1. Push down until it is below the outer surface of barrel 12.

It will be obvious that it is then only necessary to slide the core 11 onto the mandrel 12 until it passes the detent 28. Then the detent 28 is released and the slot 16 is in the sixth position.
When lined up with the detent as shown in the figure, the detent 28 is in slot 1.
6 fits perfectly.

Place a small positioning mark on the core 11 to help the worker line up the rectangular slot 16 with the stopper 2B.

To remove the core 11, the operator makes a slight turn on the core mandrel 12 as indicated by the arrow in FIG. 4, thereby depressing the detent 2B and allowing the core 11 to be removed.

[Brief explanation of the drawing]

FIG. 1 is a somewhat isometric exploded view of the combination of the present invention; FIG. 2 is a partial cross-sectional view of the embodiment of FIG. 1;
Figure 6 (Enlarged partial cross-sectional view taken along line 6-3 in Figure 2). Figure 4 is similar to Figure 6, but shows the mandrel and core in a non-connected position. It is an enlarged cross-sectional gIX section view. 10... Combination body, 11... Core, 12... Mandrel, 16... First slot, 20.21...
- Holding means, 24...second slot, 2B...return stop.

Claims (1)

[Claims] +11 An elongated cylindrical mandrel, means provided at each end of the mandrel for rotatably retaining the mandrel within the nonomera, and a longitudinal axis of the mandrel between both ends of the mandrel. a first slot positioned perpendicular to the optical axis and on the optical axis in the length direction of the image plane of the camera;
a detent deformably supported by the mandrel in a slot and extending beyond the outer surface of the mandrel through the melon 11; an elongated hollow core having a cylindrical core body; and a detent provided in the core body intermediate between the ends of the core body and sized to receive the detent for connecting the core to the mandrel. Second
A combination of a mandrel and a core for supporting a roll of photosensitive material within the camera. (2) A combination according to claim 1, wherein the holding means provided at each end of the mandrel comprises first and second short shafts of different diameters.