FR2612653A1 - Bench and equipment for photographic reproduction - Google Patents

Abstract

The present invention relates to a photographic reproduction bench comprising means for locating the viewing frame. According to the invention, these means comprise, on the side of the device 14 for lowering the photographic paper, luminous markers framing the surface 15 to be printed on, and, on the side of the exposure device 7, means 28 making it possible to view the optical images of the aforementioned luminous markers, in correspondence with the chosen imaging frame. The present invention applies to any photocopier employing photographic reproduction.

Description

BENCH AND PHOTO5RAPHIC REPRODUCTION MATERIAL
The present invention relates to a photographic reproduction bench, incorporated in particular in equipment of the photocopier type.

Certain photocopying equipment, for example of the color type, incorporating a photographic reproduction bench, includes
an exposure device for a sheet or object to be photographed, comprising a transparent exposure glass, the external face of which constitutes a horizontal exposure plane, and the internal face of which is illuminated by a light source
- a dark room associated, on one side with a lens with bellows, and on the side opposite to a device for setting in motion, or lowering, a sheet of a material impressionable by light, this device offering a surface to be impressed, vertical and flat, facing the objective;
- an optical system associating the objective, comprising a 45 c return mirror, placed between the exposure device and the dark room; thanks to the mobility in translation, relative to an appropriate cradle, the objective and / or the mirror, it is possible to accommodate, on the side of the exposure plan, a shooting frame, chosen from a range predetermined frameworks, standardized, for example; and on the side of the surface to be impressed, a reproduction format, also chosen from a range of predetermined formats, standardized, for example, and in correspondence with the optical image of the chosen shooting frame
- a means of locating on the display glass, the different shooting frames offered to the user, in the form of lines, arrows, rules or reglettes, referenced with symbols characterizing the standardized shooting frames and formats view and reproduction, for example: A3 / A4 or A4 / A3.

 Such a locating means requires to gather in the exhibition plan, for example on the exhibition glass, a multitude of lines, arrows and other symbols, entangling each other, affecting the readability of each frame d impression considered in isolation. The user can therefore, or choose the wrong frame, in which case the photocopy corresponds to part of the original, or, inside the chosen frame, said to place the original approximately, in which case the margins of the photocopy are often displaced from the original.

 The present invention relates to a means of locating the different shooting frames on the exposure glass, allowing precise reading by the user of the only marks corresponding to the frame chosen by him.

According to the present invention, the locating means comprises
- on the side of the device for setting in motion the sheet to be impressed, a lighting device comprising a group of at least two light marks framing, at the level of the surface to be impressed, the reproduction format chosen by the user;
- on the side of the exposure device, a means making it possible to view, at the level of the exposure plane, in this case the exposure glass, the optical images of the light marks through the optical system of the reproduction bench, these images being in correspondence with the shooting frame, also chosen by the user.

 Preferably, in the case of a photocopier, a framing device, for example mounted movably on the exposure device; is attached to the external face of the exposure glass, and has a border made of partially light-absorbing material, which is in correspondence with the line defined by the images of the light marks, and forms a screen for these images.

 Thanks to the invention, the adjustment of the optical system of the reproduction bench, that is to say of the objective and / or of the deflection mirror, for example by automatic control, according to the exposure frame and the format of reproduction chosen by the user, is sufficient to display at the level of the exposure plan, by simply lighting up the luminous markers, the exposure frame required for the shooting, and this before the latter.

 If the user has the object to be photographed, in this case the sheet to be photocopied, exactly between the light marks displayed at the level of the exposure glass, then he obtains a photocopy corresponding strictly to the original, without omission of information, and with margins identical to that of the original.

 The invention therefore allows precision photocopying, whatever the formats or frames chosen by the user.

 The invention also allows, after manufacture or assembly of the reproduction bench, an adjustment of the optical system, taking account of the defects and tolerances of assembly or realization. For this, in each translational position of the optical system, corresponding to a given set of a shooting frame and a reproduction format, it suffices to have a template corresponding to the chosen frame on the exposure glass, and to adjust all or part of the optical chain, for example the objective, until obtaining images of the light marks in correspondence with the template.

The present invention is now described in the context of photocopying equipment, without it being necessary to see a limitation thereof, with reference to
I attached drawings, in which
- Figure 1 shows a schematic view in vertical section of a photocopying equipment, comprising a photographic reproduction bench according to the invention
- Figure 2 shows a perspective view of the exposure device forming part of the reproduction bench shown in Figure 1
- Figure 3 shows a perspective view of the optical system forming part of the reproduction bench shown in Figure 1
- Figure 4 shows a front view, according to the surface to be impressed, of the device for setting in motion the sheet to be impressed, associated with the lighting device for the "light" marks according to the invention, these devices forming part of the reproduction according to figure 1
- Figure 5 is a partial sectional view of the movement device according to Figure 4
- Figure 6 is a rear view of the lighting device alone, shown in Figures 4 and 5
- Figure 7 is a sectional view along the line
VII-VII of Figure 6, of the lighting device according to Figure 6;
- Figure 8 is an optical diagram illustrating the operating principle of the invention.

Photographic reproduction photocopying equipment according to the invention and in accordance with FIG. 1, incorporated
a photographic reproduction bench
an impres paper supply system
sionnable by light, including a
cassette (2), in the form of a roll of the
said paper, drive rollers (3)
towards the bottom of the paper, a shear (4) per
putting to cut sheet by sheet the
strip of the same paper
a chemical treatment compartment (5)
of each sheet impresses with the read
mière, comprising seven different tanks for
different products, to obtain the
color photocopy from the sheet
impressed, photocopies completed
being collected in the tank (6)
The photographic reproduction bench according to the invention comprises the following elements.

 The exposure device (7) for the original to be photographed is arranged at the top of the equipment, in a manner accessible to the user. This device has an exposure plane (8) materialized by the external face of a window (8), the internal face of the latter being illuminated by a light source (9). A plate (10), used to press the documents to be photocopied, is hinged to the upper part of the exposure device, but has not been shown in FIG. 2.

 A dark room (11) is associated, on one side with a lens (12), in relation to a bellows (13), and on the opposite side with a device (14) for setting in motion the sheet of paper impressionable by light, more particularly represented in FIGS. 4 and 5. This device offers a surface to be impressed (15), flat and vertical, facing the objective (12), this surface (15) corresponds to the plane of FIG. 4.

The device for setting in motion, and more precisely for lowering the sheet to be impressed, comprises a parallelepiped box (16) equipped with two outward suction turbines (17a and 17b), this box comprising on its facing the objective (12) facing the vertical slots (16a to 16f), allowing the passage of belts (18a to lEf) respectively, driven by the same motor axis (19) with an opposite return axis (20). The motor axis (19) is driven by a motor with geared motor (21). The lower part of the darkroom (11) stops the sheet of photographic paper for the standardized format, called A3, while two stops (21a and 21b), actuated through slots (16g and 16h) in the exposure wall of the box (16), by electromagnets (22a and 22b), stop the descent of the paper photographic according to the said format
A4.

 An optical system (23) associating the objective (12) and a mirror (24) returning to the exposure glass (8), is arranged between the exposure device (7) and the darkroom (11).

The objective (12) and the mirror (24) are movable in translation on two parallel rails (25a and 25b), and can be arranged in any predetermined position, by means of geared motors, not shown in FIG. 3, but represented under the reference (26) in FIG. 1, as regards the gear motor for driving the miro: r (24). By an appropriate control, for example controlled by a microprocessor, by moving the objective (12) and / or the mirror (24), it is possible to accommodate on the side of the exposure plane (8) all shooting frames chosen from standardized shapes and dimensions, say for example-A3, A4, B4, or B5, and on the side of the surface (15) to be impressed, any reproduction format tin1 also chosen from standardized shapes and dimensions, for example called A3 and A4 to match meaning that the reproduction format is in correspondence with the optical image, through the system defined above, of the shooting frame chosen by the user tor.

 The system for locating the shooting frame, according to the exposure frame and the reproduction format previously chosen, comprises, on the side of the device (14) for setting in motion, a lighting device (27) comprising two parts separated (27a and 27b), arranged on either side of the reproduction format, whether it is A3 or A4 format, and on the side of the exposure device (7), a display means described below next, consisting of a framing device (28). The lighting device (27a or 27b), more particularly shown in Figures 6 and 7, comprises a housing having two bosses (28a and 28b), one upper and the other lower, having an oblique face. of each boss (28a or 28b) is arranged a light source (29a or 29b) respectively, with a stroboscopic effect Furthermore, each boss (28a or 28b) has a front wall slightly inclined with respect to the vertical (cf. FIG. 7), perforated according to the reference (28c or 28d) to constitute luminous marks illuminated by the source (29a or 29b). Each lighting device (27) is mounted on the printing wall of the lowering device (16), by screws not shown, so that the bosses (28a and 28b) emerge through suitable slots, upper ( 30a) and lower (30b), for the lighting device (27a), and upper (31a) and lower (31b), for the other lighting device (27b). oblique of each emerging boss is directed towards the inside of the printing face, the distance separating the luminous marks (28c), and that separating the luminous marks (28d) being equal to the standard width of formats A3 and A4. The group of two upper luminous marks (28c) frames the A4 format, when the stops (21a and 21b) are actuated by the electromagnets (22a and 22b), and emerge from the surface to be impressed (15). The group of the two lower light marks (28d) corresponds to the A3 format, when the photographic sheet is in contact with the lower wall of the darkroom (11).

 The framing device, more particularly visible in FIG. 2, makes it possible to view, at the level of the exposure glass (8), the optical images of the light markers (28c or 28d) (depending on the reproduction format chosen by the 'user), through the optical system (23), these images being in correspondence with the shooting frame corresponding to the original in Dho-tocopier. The device (28) corresponds to a movable strip in translation, by means of slides (32a and 33b), on the exposure device (7). The strip (28) includes an opaque part (28a) and a straight edge (28b) in frosted glass. A thumb wheel (33) allows the strip (28) to be moved in translation and vis-vis the exposure glass ( 8). I1 is further provided Jn guidance system with an indicator light (34), allowing to guide the user in his movement of the strip (28), and to indicate to him, for example by lighting the light, that the strip in question is in the position corresponding to the exhibition frame he has chosen.

 The operation of the photocopying equipment described above is now explained in more detail, it being understood that the inscriptions, such as A3, A4, BS, B5 have been shown in FIG. 2 for the convenience of the description, but do not correspond to marks printed or attached to the exposure device (8). I1 is the same for the different standardized formats, rectangular, shown on the exposure glass in Figure 2, always for the convenience of the presentation, it being understood that in reality this window is free of any registration or registration. Likewise, the arrows shown on the border (28b) in a dark manner, some important, when the exhibition frame corresponds to an A3 or A4 format, others smaller, when the exhibition frame corresponds to a B4 format. or BS, do not exist in reality, and have simply been shown in Figure 2 for the convenience of discussion.

 The optical diagram corresponding to the operation of the photographic reproduction bench is represented in FIG. 8. It is assumed that the user has chosen as the reproduction format the format A3, corresponding to the group of light markers (28d). As indicated above, these define a straight line corresponding to one of the sides of the A3 format, and they are separated by a distance equal to the dimension of the same side of the same A3 format. The user also chooses a shooting frame, corresponding for example to the A3 mat of the original to be reproduced. Depending on the corresponding commands displayed by the user, the objective (12) is automatically positioned in the A3 position, while the deflection mirror (24) remains stationary. By moving the slide (281), the border (28b), partially absorbing the light coming from the sources (28d), comes in correspondence with the line defined by the images of the light marks (28d), and forms a screen for these images. Consequently, on the one hand, the indicator light (34) of the guidance system lights up, to indicate the correct position in translation of the strip (28), in relation to the formats chosen by the user, etc. apart from the luminous arrows (40a and 40b) appear on the frosted border (28b). The user only has to place the small side of his original precisely in correspondence with the arrows (40a and 40b) and to lower the plate (10). Shooting can then take place, this being preceded by lowering the photographic paper, by means of the drive rollers (3), to the lower level of the darkroom (11), then by cutting with shears (4) according to the A3 format. After taking the picture, the sheet printed in A3 format is discharged towards the chemical treatment compartment (5), by means of the descent device (14), by displacement of the belts (18a) to (18f).

 If the user chooses a shooting frame corresponding to the A4 format of his original, the lens moves to the A4 position shown in Figure 8 and in the same way, by moving the slide bar (28), the marks luminous (28d) are materialized on the border (28b), according to the arrows (41a and 41b) guiding the user in placing the original.

 In each of the cases described above, the frosted border (28b) forms a screen for the images of the light markers (28c) or (28d).

Claims (11)

 1 / A photographic reproduction bench, comprising  - an exposure device (7) of the object to be photographed, presenting an exposure plan 8)  - a dark room (11) associated with a tee with an objective (12), and on the opposite side to a device (14) for setting in motion a sheet of a material impressionable by light, this device offering a substantially flat surface to be impressed (15) facing the objective ;;  a light source (9) for illuminating the object to be photographed  - an optical system (23) associating the objective, arranged between the exposure device and the dark room, making it possible to accommodate, on the side of the exposure plane a shooting frame, and on the side of the surface to impress a reproduction format, in correspondence with the optical image of the shooting frame  - A means (28) for locating the shooting frame characterized in that the means for locating the shooting frame comprises  - on the side of the movement setting device,  a lighting device (27) comprising a  group of at least two light markers  (28c) framing, at surface level  (15) to impress, the format of reproduc  tion  - and on the side of the exposure device, a  means (.28) allowing to visualize, at ni  calf from the exhibition plan (8), the images  light markers, through the  same optical system (23), these images being  in correspondence with the taking framework  view.  2 / Bench according to claim 1, according to which the frame? -Exposure and the reproduction format have a rssctangular shape, characterized in that the two aminous marks (28c) define a straight line corresponding to one of the sides of the reproduction format, and are separated by a distance corresponding to the dimension of the same side of the same format.  3/3 / Bench according to claim 1, characterized in that the lighting device comprises a light source (29a, 29b) with stroboscopic effect.  4 / Bench according to claim 1, according to which the exposure device comprises a transparent exposure glass (8), the external face of which constitutes the exposure plane, and the internal face of which is illuminated by the light source (9 ), characterized in that the means for displaying the optical images of the light markers comprises a framing device (28) attached to the external face of the exposure glass, comprising an edge (28b) of material that partially absorbs light, in correspondence with the line defined by the images of the light markers, and forming a screen for these images.  5 / bench according to claim 1, characterized in that the absorbent material of the edge (28b) is a frosted glass.  6 / Bench according to claim 1, according to which the optical system (23) is movable in translation and makes it possible to accommodate between the exposure plane (8) and the surface to be impressed (15), a shooting frame and a reproduction format, both chosen by the user from two given ranges respectively, characterized in that a plurality of reproduction formats corresponds to a plurality of groups (28c, 28d) of light markers (28), forming part of the lighting device (27).  7 / bench according to claim 6, characterized in that the optical system (23) is movable in predetermined positions, allowing to accommodate a plurality of exposure frames with a plurality of reproduction formats.  8 / bench according to claim 5 and any one of claims 6 and 7, characterized in that the framing device (28) is mounted on the exposure device (7), movably in the plane of exhibition, to view the different groups of images of light markers and possibly materialize the different exhibition frames.  9 / Bench according to claim 8, characterized in that the framing device consists of a strip (28) movable in translation, avec.une border (28b) rectilinear.  10 / Bench according to claim 8, characterized in that it comprises a system for guiding the framing carriage, relative to the exposure frame chosen by the user, said system comprising an indicator light (34).  11 / Photographic reproduction equipment, of the photocopier type, comprising a bench according to any one of claims 1 to 10.