JPH01144036A - Instant photographing device - Google Patents

Abstract

PURPOSE:To prevent the useless consumption of negative film by starting an optical system exposing a photosensitive member based on signals from a detecting means detecting the tip of the photosensitive member. CONSTITUTION:When the tip of the conveyed negative film 64 is detected by a sensor 25, or a certain time passes after that, 1st and 2nd traveling bodies 4 and 5 are scanned, and exposure is performed in the exposing part A of a guide plate 24 to form a latent image. With respect to the tip of the cut negative sheet, no latent image cannot be formed in the distance between the position in which the sensor 28 detects and the exposing position A. The exposing position A and the sensor 25 are arranged so that said distance is shorter than a distance between the tip of the positive sheet and the leading edge of an image transferred onto the positive sheet. Thus the useless consumption of the negative film can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a peel-apart type instant photographic apparatus configured to cut a roll-shaped photosensitive member one by one.

[Prior art]

An instant photographic device that uses this kind of peel-apart type instant photographic film pulls out a roll of negative film (photosensitive member) to the exposure position, and connects the exposed negative sheet (cut negative film) with the timing from a predetermined position. The positive sheet conveyed by the developer is placed on top of the other with the developer-filled bottle in between, and the pressure of the developing roller ruptures the sealing part of the bottle to spread the developer evenly between the two, allowing it to be developed and transferred. It is a mechanism.

However, in the past, with this type of apparatus, there have often been cases where waste of negative film (cutting longer than the required length) has been a problem.

〔the purpose〕

The present invention has been made based on this background, and an object of the present invention is to eliminate the drawbacks of the above-mentioned prior art and to provide an instant photographic device in which the length of the negative film to be cut is shortened as much as possible. be.

〔composition〕

To this end, the present invention provides a reference position that is downstream of the exposure position of the photosensitive member and is separated from the exposure position by a length corresponding to the distance from the leading edge of the positive sheet to the leading edge of the image to be transferred and imaged onto the positive sheet. and a detection means for detecting the tip of the photosensitive member upstream from the reference position, and an optical system for exposing the photosensitive member is started based on a signal from the detection means. .

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows the overall configuration of an instant photographic device that uses peel-apart type instant photographic film. This device uses an optical system that scans the surface of a document while irradiating illumination light and forming an image at a predetermined position (n light plane). It consists of a system unit 1 and a transport unit 2 that transports a negative sheet to a predetermined position, exposes it to light, aligns and overlaps a positive sheet, spreads a developer therebetween, and transfers and forms an image onto the positive sheet.

The optical system unit 1 consists of a contact glass 3, a first traveling body 4 consisting of a first mirror and a light source, a second traveling body 5 consisting of a second mirror and a third mirror, a lens 6, and a fourth mirror and a fifth mirror. Third traveling body 7 and sixth mirror 1
It is composed of 0 etc. The light source included in the first traveling body 4 is a fluorescent lamp (preferably a color rendering lamp for better color reproduction), etc., and scans an original placed face down on the contact glass 3 parallel to the contact glass 3. irradiate while The second traveling body 5 is scanned in the same direction at half the speed of the first traveling body, keeping the optical path length constant.

The magnification and conjugate length during zooming are adjusted by moving the lens 6 and the third traveling body 7 (dotted chain line in FIG. 1).

The original reflected light is the first. reflected by the second and third mirrors,
Furthermore, the lens 6, the fourth lens. Fifth. Slit exposure is performed at exposure position A via the sixth mirror.

Further, a light-shielding cover 8 that covers the lens and a light-shielding cover 9 that is fixed to the bottom plate of the optical system are provided. The light-shielding cover 8 moves together with the lens 6 while contacting the fixed light-shielding cover 9 via a telescope or the like. These prevent flare light from entering from the periphery of the lens 6 as much as possible.

Next, the transport unit 2 will be explained in detail along with its operation. The conveyance unit 2 is composed of a negative roll film feed section, a fed negative film cutter section, a negative film conveyance/exposure section, a positive sheet conveyance section, a body supply section, and a developing section. As will be described later, a negative film 64 containing a positive sheet and a circular film is housed in a roll in a light-shielding container 63.
is conveyed onto the guide plate 24 by the rotation of the pull-out roller pair 18a, 18b and further by the rotation of the intermediate roller 27.

When the leading edge of the conveyed negative film 64 is detected by the sensor 25 or after a certain period of time, the first traveling body 4
The second traveling body 5 is scanned, and exposed at the exposure portion A on the guide plate 24 to form a latent image.

The exposure section A is a flat surface spanning the slit area, and is provided at the same level as or higher than the nip height of the pair of pull-out rollers 18 and the pair of intermediate rollers 27. Further, the circumferential speed of the intermediate roller pair 27 is set to be slightly faster than the circumferential speed of the pull-out roller pair 18, and the rollers of the pull-out roller pair 18 are provided with an overrun mechanism.

As described above, the negative film can be conveyed with some tension on the exposure section A, and can be conveyed while being brought into close contact with the guide plate 24, so that the optical path length to the negative film surface and the conveyance speed can be kept constant.

The negative film exposed for a certain length and on which a latent image has been formed is temporarily stopped, and then the rotary blade 20a rotates while contacting the fixed blade 20b and is cut into sheets.

The above-mentioned stop timing is determined by counting the time t after the sensor 25 detects the leading edge of the negative film.

Although the optical system scanning speed changes due to magnification change, the negative film transport speed is constant, so if the film is stopped and cut after a certain time (1) after the leading edge of the film is detected, a negative sheet of a certain length can be obtained.

Therefore, a latent image cannot be formed on the rear end of the cut negative sheet at least beyond the distance from the exposure position A to the tip of the fixed blade 20b (this distance is G), but this distance If the exposure position A and the cutter are arranged so that the distance M (in Figure 2) from the rear edge to the rear edge of the image area to be transferred onto the positive sheet is smaller than D, image formation will not occur in any case. Since it is a necessary area, it is possible to prevent wastage of the negative film (cutting it to a length longer than the required length), and the above-mentioned problem can be solved.

Similarly, a latent image cannot be formed at the leading end of the cut negative sheet at least at a distance greater than the distance from the detection position by the sensor 25 to the exposure position A (this distance is defined as H), but H is from the leading end of the positive sheet, which will be described later. By arranging the exposure position A and the sensor 25 so that the distance to the leading edge of the image portion to be transferred onto the positive sheet is smaller than the distance C (in FIG. 2), it is possible to prevent waste of negative film.

Furthermore, in the above method, since the negative film is cut after the exposure is completely completed, it is possible to prevent the transport speed from changing due to impact caused by cutting during exposure.

The direction of the cut negative sheet is changed by about 180 degrees by rollers 28 and guide plate 29, and then conveyed by rollers 26 until the leading end abuts against a pair of developing rollers 30.

The above-mentioned conveyance, exposure, and cutting of the negative films and sheets are carried out inside the machine in a dark place while shielding external light with an exterior or the like.

Unlike negative sheets, positive sheets are not photosensitive and can be inserted from outside the device. In this embodiment, multiple positive sheets 7
1 is stored in the cassette 35, and this is attached from the bottom right of the main body. The stacked positive sheets 71 are separated and conveyed one by one by a feeding roller 36 and a separation device not shown in the figure.The separated positive sheets 71 are conveyed by an insertion roller 38 to between guide plates 39 and 40, and the leading edge is connected to a sensor. 37
It stops after a certain period of time detected by , that is, when the leading end hits the nip between the pair of developing rollers 30 .

FIG. 8 is a diagram showing the vicinity of the developing roller pair 30 of the apparatus of this embodiment. By abutting both the negative sheet 70 and the positive sheet 71 against the nip of the pair of single developing rollers 30, they are aligned. Therefore, a complicated positioning device is not required, and the device can be made inexpensive and compact. The developing roller pair 30 is composed of a pair of pressurized metal straight rollers. With the developing roller pair 30 stopped, the leading edge of the positive sheet 71 hits the nip before the negative sheet 70, and the positive sheet 71 stops and waits.

Next, by winding up the tape, which will be described later, only one pod falls from the storage container. As shown in FIG. 8, the guide plate 44 is inclined downward with respect to the developing roller pair 30,
In addition, since the guide plate 40 is also tilted downward or kept horizontal, the dropped bod 15 slides on the guide plate 44, falls into the gap between the developing roller pair 30 and the guide plates 44 and 43, and falls onto the stopped positive sheet 71. The tip of the bot hits the nip between the developing roller pair 30 and stops (arrow F).
Thereafter, the negative sheet 70 that has been exposed is conveyed between the guide plates 43 and 44 by the rollers 26, passes over the stopped bod, and its leading end hits the nip.

Feeding, cutting, and exposing the negative film are performed when the sensor 37 shown in FIG. 1 does not detect the positive sheet 71, or when the sensor 80 shown in FIGS. 1 and 8 does not detect the passage of the pod. For example, malfunctions such as forgetting to insert the positive sheet 71 or defective bot feeding can be prevented by disabling the press of the print SW. Similarly, the sensor 37 is connected to the positive sheet 7.
1 is not detected, by controlling the supply of the pod 15 to be prohibited, it is possible to prevent wasteful consumption of the pod 15 and the negative film 64 due to poor conveyance of the positive sheet 71.

After the negative sheet 70, positive sheet 71, and bod 15 are brought into contact with the nip and their tips are aligned, the developing roller pair 3
0 rotates and conveys the champion together, and at this time, the aforementioned bot is crushed and the developer is spread between the negative and positive, and development (transferring and fixing the negative latent image to the binding sheet) is performed. The developing roller pair 30 is required to have highly accurate straightness in order to spread the developer uniformly (with a constant thickness).

Both the developed negative and positive sheets are discharged to the discharge tray 46 while being closely adhered by the developer, and when the positive sheet is peeled off after several tens of seconds, a positive color image is transferred onto the positive sheet.

Maintenance (cleaning, etc.) of the developing roller can be carried out by rotating the pair of developing rollers 30, which is made up of the frame 52 and the ejection guide 53, to the left around the shaft 54 with the tray 46 removed. Do it in the state that appears.

Next, the film used in the image forming method of this apparatus will be explained. This instant photographic film consists of a box containing a negative film, a positive sheet (photographic paper), and a pack containing a developer. The negative film is exposed by the optical system unit, and then its leading edge is brought together with the positive sheet, and the negative film is passed between a pair of developing rollers 30 which are pressed together with the positive sheet and the body. At this time, the sealing part of the bag is torn, and the developer is evenly spread between the positive sheet and the negative film. Development starts now, the negative develops color in a few tens of seconds, the coloring agent is transferred to the positive sheet, and then when the negative film is peeled off from the positive sheet,
A positive color image is obtained on a positive sheet.

As shown in Fig. 2, the positive sheet has a removable sight rail 11, such as a tape-like band attached to the stamping surface, on the outside of the image forming surface so that the developer that has flowed and spread does not leak from both ends. provided. Further, a mask sheet 12 forming the boundaries of the image forming area of the positive sheet may be releasably attached to the four sides of the positive sheet.

The sight rail 11 has a constant thickness in the transport direction (approximately 0.1 m), so when the negative film and positive sheet passed between the pressurized rollers, the developer spread between the two sight rails is The thickness remains constant due to the high viscosity of the liquid.

A trap 13 is provided at the rear end of the positive sheet to receive and store the developer, and is removable so that excess developer is not squeezed out of the positive sheet and contaminates rollers and the like. Wedges 14 having a thickness of about 2 m are provided at both ends of the trap. This causes the spread developer to accumulate between the wedges 14 on the trap.

The length of the bot sealing part must be narrower than the sight rail that prevents the developer from flowing out in the width direction. It takes some distance for the developer to spread to both sight rails of the positive sheet. has good image formation throughout the hit (
(transfer) cannot be performed, so a latent image is formed on the negative by shifting it by that length from the leading edge of the negative (C). Furthermore, the trap length of the positive sheet is 1 to prevent excess developer from being squeezed out and attached to the developing roller at the rear end as described above.
! Provide extra length at the end (D).

Therefore, the length of the negative sheet is equal to the distance from the leading edge of the positive sheet to the rear end of the trap 13. From the above, as shown in Figure 6, the cut negative sheet has a tip (C) that is longer than the length (L) where a latent image is actually formed.
A slight extra length is provided at both the rear end (D).

For positive sheets, the distance between the pair of developing rollers 30 is maintained at a constant distance (approximately 0.1 m) for the image length, and the distance is forcibly increased (approximately 2 meters) when the rear ends of both sheets are discharged. ) It is also possible to eliminate the sight rail 11 and wedge 14 by providing a mechanism.

Next, the supply of negative film sheets and pods will be explained. As shown in FIGS. 3 and 4, the negative film container is made by folding a light-shielding cardboard, plastic sheet, or a layer of aluminum foil 21 into the grooves of the resin-molded side end members 22. inserted and assembled. The side end member 22 is provided with a boss portion 23 that rotatably supports the inner diameter of the core of the film shaft. The film guide part 19 is made to protrude outside the main body, and a long-pile velvet 65 is pasted on the inside to prevent light from entering the film inside. The leading end of the guide part can ensure that the leading end of the film is inserted between the rollers, and when the rollers are closed, the initial length of the leading end of the film sandwiching the film can be regulated as shown in FIG. A label may be attached to the outside of the container so that the type of film currently installed can be visually checked from outside the device.

In this apparatus, a plurality of pods, their storage containers, and a pod supply mechanism are integrally provided at the bottom of the negative film container. If the type of negative film changes (for example, color, black and white, OHP, etc.), the developing side enclosed in the casing must also be changed, but since the negative film and casing are installed together, the negative film and bots can be prevented from being used in different combinations.

As shown in FIGS. 7 and 8, a chamber 81 is provided at the bottom of the negative film container, and a tape 83 folded into an accordion shape and a plurality of bodies 15 are housed inside the chamber 81. Each body 15 has an accordion-shaped tape 83
The tape is removably attached to the valley portion of the tape over a width t. The tape 83 passes from the opening J of the chamber 81 under the bottom plate 82 and is wound around a reel 84 . reel 84
is rotationally driven by a drive (not shown) inside the container or the machine body.

As mentioned above, the tip of the positive sheet 71 is connected to the developing roller pair 3.
After reaching zero, the reel 84 winds up the tape 83 for a certain length. The tape 83 and the bod 15 move as shown in FIG. 7(a)→(11)-(C) as they are wound up, and the tape 83 is bent by about 90 degrees by the bottom plate 82, so that the bods 15 are rolled up one by one. It is peeled off from the tape 83.

Due to gravity, the peeled off bod 15 moves in the direction of arrow F shown in FIG.
It falls with a trajectory like this.

In this embodiment, the bods 15 are arranged vertically, but as shown in FIG. 9, the bods 15 can also be arranged horizontally (stacked) and supplied one by one in the same manner. The number of bots 15 is the same as the number of negative sheets cut from the roll. Therefore, when the body 15 is used up, the negative film is used up, and the body 15 and the negative film 64 are not wasted.

Further, since one bot 15 is consumed for each negative sheet, the remaining amount of the bot 15 and the remaining amount of negative film (sheets) are the same. Further, since the tape 83 is wound to a fixed length for each copy, the remaining amount of negative film can be displayed from the display window 86 by marking numbers on the tape 83 at the intervals.

In addition, the tape is painted black (other parts are white) so that when the body 15 is removed, the end of the tape is detected by a reflective sensor 85 fixed in the main body, and the sensor 85 detects this. When this occurs, if the print SW is disabled or otherwise controlled, empty feeding of the negative film and the cassette can be prevented. Furthermore, if the sensor 85 is set to emit the same signal as when detecting the black painted part even when there is no negative film cartridge, forgetting to insert the negative film cartridge can be prevented.

〔effect〕

As described above, according to the present invention, it is possible to prevent waste of negative film (cutting it to a length longer than necessary).

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of an instant photographic device according to an embodiment of the present invention, Fig. 2 is an external view of a positive sheet, Fig. 3 is an external view of a negative film container, and Fig. 4 is a partial view of the same. figure,
Figure 5 is an external view of the negative film container with the leading edge of the negative film pulled out, Figure 6 is a diagram showing the latent image formation range of the cut negative sheet, and Figures 7 (a), (bl, (C)
) is a diagram showing a situation in which a bod is supplied from the bod storage section, FIG. 8 is a side view showing a confluence section of a negative sheet and a positive sheet, and FIG. 9 is a diagram showing another example of the bod storage section. 15...Bod, 18...Roller pair, 24...Guide plate, 25...Sensor, 27...Intermediate roller pair,
64... Negative film, 70... Negative sheet, 71
...Positive sheet, 81...Bod storage section (chamber), 83...Tape, A...Exposure position. 2nd Agony Figure 3 115 Figure 7 Figure 9 Procedural Amendment (Voluntary) Δ Month 27, 1986

Claims (1)

[Claims] In a peel-apart instant photographic device configured to cut a roll-shaped photosensitive member one by one, expose the photosensitive member to light, and then transfer it to a positive sheet, the process is downstream from the exposure position of the photosensitive member, and from the tip of the positive sheet to the top of the positive sheet. a reference position separated from the exposure position by a distance corresponding to the distance to the leading edge of the image to be transferred and imaged; and a detection means for detecting the leading edge of the photosensitive member upstream of the reference position; An instant photographic apparatus characterized in that an optical system for exposing a photosensitive member is started based on a signal from the detection means.