JPH0284643A - Instant photographic device - Google Patents

Abstract

PURPOSE:To prevent the contamination of a developing roller, etc., caused by the squeeze-out of developer by separating both developing rollers from each other and inhibiting a next copying action in the case of still detecting an image receiving sheet after completing the copying action by a detection means. CONSTITUTION:When the detection means 17 provided on the upstream side of a pair of developing rollers 30a and 30b detects the image receiving sheet 32 or a photosensitive sheet 11', one of the developing rollers 30a and 30b is separated from the other by using a cam, for example, even after completing the copying action. At the same time, the next copying action is inhibited. The copying action is inhibited by making a copying button not operated or displaying that copying is impossible, etc., or combining them with the detection signal of the detection means 17. Thus, failure that the developing roller, etc., is contaminated because of the squeeze-out of the excess developer in the case of forgetting to take out both sheets tightly adhering after completing copying can be eliminated.

Description

Detailed Description of the Invention The present invention uses a photosensitive sheet 1 and an image receiving sheet, and passes both sheets between a pair of developing rollers to form an exposed latent image using an optical system. An instant photograph in which the latent image forming surface of a photosensitive sheet and the image receiving surface of an image receiving sheet are aligned, the latent image on the photosensitive sheet is colored by cleavage of an enclosed developer, and the coloring agent is transferred onto the image receiving sheet. Regarding equipment.

The above-mentioned instant 1 photographic device has been applied to cameras, but it is not yet known to apply it to copying devices. When applied to a copying machine, if one forgets to take out both sheets that are in close contact with each other after copying is completed, an inconvenience arises in that excess @ developer spills out and stains the developing roller and the like.

An object of the present invention is to eliminate the above-mentioned disadvantages when using an instant photographic device as a copying device.

, In order to solve the above problem, in an instant I photographic apparatus of the type described in the industrial application field, the present invention solves the above problem. A detection means is provided near the developing roller, and if the detection means still detects the image receiving sheet or photosensitive sheet after the copying operation is completed, the problem is solved by separating both developing rollers and prohibiting the next copying operation. do.

Furthermore, in the above case, the image receiving sheet is pasted on the carrier sheet, and the distance from the rear edge of the image receiving sheet to the rear edge of the carrier sheet is the distance from the rear edge of the photosensitive sheet to the rear edge of the latent image forming surface formed on the photosensitive sheet. This problem can be advantageously solved by attaching the image-receiving sheet to the carrier sheet so that the image-receiving sheet is longer than the distance from the developing roller pair nip to the detecting means.

When the detection means provided upstream of the developing roller pair detects the image receiving sheet or the photosensitive sheet.

Even after the copying operation is completed, one roller of the pair of developing rollers is separated from the other using, for example, a cam.

At the same time, the next copy operation is prohibited.

This prohibition of the copying operation is performed by deactivating the copy button, displaying that copying is not possible, etc., based on the detection signal of the detection means, or by a combination thereof.

Further, when the pair of developing rollers is stopped after the completion of the developing operation, only the rear end of the image receiving sheet may remain between the detecting means and the nip of the pair of developing rollers. At this time, the second claim
With the configuration described above, the rear end of the photosensitive sheet, that is, the surplus developer reservoir can be made to have already passed through the pair of developing rollers.

Figure 1 shows the overall configuration of an instant photographic device using beer apartment type instant photographic film. This device consists of an optical system unit 1 that irradiates illumination light while scanning the document surface and forms an image at a predetermined position (exposure surface), a negative film that is conveyed to this predetermined position and exposed, and a positive sheet and a It is constituted by a conveying unit 2 that stacks the sheets together, spreads the developer between them, and transfers and forms an image onto the positive sheet.

The optical system unit 1 includes a contact glass 3, a first traveling body 4 consisting of a first mirror and a light source, a second mirror and a third mirror.
A second traveling body 5 consisting of a mirror, a lens 6 and a fourth mirror, a third traveling body 7 consisting of a fifth mirror, and a sixth mirror 10
It is composed of etc. The light source included in the first traveling body 4 is a fluorescent lamp or the like, and illuminates the document placed face down on the contact glass 3 while scanning it parallel to the contact glass 3. 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.

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.

Next, the transport unit 2 will be explained in detail along with its operation. The conveyance unit 2 is composed of a photosensitive negative roll film feeding section, a fed out negative film cutter section, a negative film conveying/exposure section, a positive sheet conveying section, and a developing section. As will be described later, the negative film 11, which is a positive sheet and a roll stored in a light-shielded storage container 8, is conveyed onto a guide plate 24 by the rotation of a pair of pull-out rollers 18a, 18b and further by the rotation of an intermediate roller 27. be done.

When the leading edge of the conveyed negative film 11 is detected by the sensor 14, or after a certain period of time.

The first traveling body 4 and the second traveling body 5 start scanning, and exposure and latent image formation are performed at the exposure section A on the guide plate 24.

The exposure section A is a flat surface extending over the slit area, and is provided at the same or higher nip height of the pair of pull-out rollers 18 and the pair of intermediate rollers 27. Furthermore, 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.

In addition, an overrun mechanism is provided on the rollers of the pull-out roller pair 18.

As described above, the negative film can be conveyed with some tension on the exposure section A, and can be conveyed without 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 that has been exposed to light over a certain length and on which a latent image has been formed is temporarily stopped, and then the rotary blade 20a rotates without contacting the fixed blade 20b and is cut into sheets. The stop timing is determined by counting the time t after the sensor 14 detects the leading edge of the negative film.

Although the scanning speed of the optical system changes due to magnification change, the negative sheet conveying speed is constant, so if the film is stopped and cut after the above-mentioned fixed time from the detection of the leading edge of the film, a negative sheet 11' of a fixed 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 defined as G). However, the exposure position A and the cutter must be arranged so that this distance G is smaller than the distance from the rear edge of the positive sheet to the rear edge of the image area transferred onto the positive sheet (D in Figure 3), which will be described later. Ba.

In any case, this is an area where image formation is unnecessary.

It is possible to prevent the wastage of negative film by cutting it to a length longer than necessary, and to solve the conventional problems.

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 14 to the exposure position A (this distance is defined as H), but H is from the leading end of the negative sheet, which will be described later. The distance should be smaller than the distance (C' in FIG. 2) to the tip of the latent image formed on the negative sheet.

By arranging the exposure position A and the sensor 14, 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 conveyance speed from changing due to impact caused by cutting during exposure.

The cut negative sheet is transferred to roller 28. After the direction is changed by about 180° by the guide plate 29, the guide plates 13a, 13
b, and is conveyed by the rollers 26 until the leading end abuts against a pair of rollers 34, which is stopped at this time.

The positive sheet conveyance is performed before the negative sheet conveyance (exposure, cutting) described above.

Unlike negative sheets, positive sheets are not photosensitive, so they can be inserted from outside the device. In the apparatus of this embodiment, the positive sheets are manually inserted one by one to the left along the guide plate 9 at the lower right of the main body. This eliminates the need for paper feed, separation devices, paper feed cassettes, etc., making the device compact and inexpensive.

As shown in FIG. 1, the positive sheet is inserted along the lower guide plate 9 and both side guides (not shown), and when the leading end is detected by the sensor 15, the insertion roller 38 rotates. The rollers of the insertion roller 38 are provided at positions that grip only the outer ends of the positive sheet so as not to crush the developer pond attached to the front end of the positive sheet. The positive sheet is
The sheet is conveyed between the guide plates 36a and 36b by the insertion roller 38, and stops when the leading end hits the nip between the pair of developing rollers 3o. The above-mentioned stop timing is determined by counting the time t'' after the sensor 17 detects the leading edge of the positive sheet.The leading edge of light-shielding Mylar 21 is pasted over the entire width of the guide plate 36a. ,
The positive sheet fed between the guide plates 36b is pressed against the guide plate 36b with a light downward force due to the rigidity of Mylar itself.

The positive sheet is conveyed without being rubbed by the tip of the Mylar 21 and the guide 36b. Also, positive!・The transport path has at least one bend.

In FIG. 1, the roller 30b of the developing roller pair is
It is pivotally connected to one end of an arm 23 that is rotatable around a fulcrum 25, and the rotation of the arm 23 is controlled by a cam 22, eventually bringing the developing rollers 30a and 30b into contact with each other.

In FIG. 2, a negative film 11 which is a photosensitive strip material is shown.
is a long sheet, is wound into a roll with the latent image forming surface facing inside, and is stored in a storage container 8 shown in FIG. Each time an image is created, it is pulled out a certain length, and as mentioned above, it is exposed at exposure section A.
After the latent image is formed, it is cut into resheets by a cutter including a rotary blade 20a and a fixed blade 20b.

FIG. 3 shows a state where a positive sheet 32 having a required image receiving area is removably applied on a carrier sheet 31. When a positive sheet is made thinner for ease of handling, or when a transparent positive sheet is used, room light enters from the back side of the sheet during the development process, causing fogging. In order to eliminate this inconvenience, a carrier sheet 31 is placed on the back side of the positive sheet as a light shielding member. A developer bot 12 is attached to the leading end of the carrier sheet 31 when viewed in the conveying direction. The carrier sheet 31 is a positive sheet 3
It is slightly larger than 2, and there are margins C, D in each part of the front and rear.
E is provided.

Development will be explained below.

Development in the instant photographic device according to the present invention means:
This means that the developer is evenly spread between the negative sheet and the positive sheet. The developing roller pair is composed of a metal straight roller 30a and a stepped metal roller 30b (see FIG. 4) having collar portions L1 and L2, and both rollers are pressed with an appropriate force when joining. In that case, negative sheet 1
1' and the side edges of the carrier sheet 31 (Figs. 2 and 3)
E and E' in the figure show the empty part of the stepped roller 30b.

It is bitten into L2 and transported. The developer 35 that has flowed out due to the rupture of the developer bot 12 has a high viscosity, so as shown in the shaded area in FIG. Flex the sheets until they are in close contact with each other, then press and spread both sheets apart. Therefore, the thickness of the developer between both sheets is kept constant at about 0.inn. The shaded area showing the spread developer in FIG. 4 is exaggerated for clarity.

Since the cleavage portion of the developing body 12 is at the rear end F (FIG. 3), the developer does not spread over the length of the bond. Further, after cleavage, some distance is required for the developer to spread to both sides of the positive sheet. Since good image formation (transfer) cannot be performed over the entire width by this distance, image formation is performed by shifting by this distance (corresponding to C).

The developer is sealed in the bot 12 in an amount larger than that required for image formation so that the developer can sufficiently reach the rear end of the positive sheet. Excess developer is removed from the rear end between both sheets (D,
(equivalent to D'), thereby preventing it from sticking out and adhering to the developing roller, etc.

Referring again to FIG. 1, the leading edge of the carrier sheet 31 supporting the inserted positive sheet 32 is aligned with the developing roller pair 30a, 3.
After hitting 0b and stopping, the already mentioned negative film 11
transportation, exposure, and cutting are performed. Pair of rollers that can be stopped 34
The negative seam 1-11' that came into contact with the guide plate 13a,
After being bent by a certain amount at the enlarged portion between the guide plates 13b, the roller pair 34 rotates to convey the guide plate between the guide plates 33a and 33b. The start of rotation of the roller pair 34 is determined by counting the time since the sensor 16 detects the leading edge of the negative sheet. By bending the negative sheet as described above, the conveyance timing of the negative sheet can be adjusted, and the leading edge of the negative sheet can be brought into the nip between the pair of rollers 34 to correct the skew.

In FIG. 5, the pair of developing rollers 30a and 30b start rotating by adjusting the timing by the sensor 19 or 16 before the leading edge of the negative sheet 11' hits the nip of the pair of developing rollers, and the nip of the negative sheet 11' has already been hit. Convey the positive sheet first.

Thereafter, the leading edge of the negative sheet reaches the nip between the pair of developing rollers 30a and 30b due to the rotation of the roller 34, and both are conveyed at the circumferential speed of the pair of developing rollers, so that a gap J occurs between the leading ends of the positive sheet and the negative sheet. Since this deviation is controlled to be at least smaller than C in Fig. 3,
The length of the negative sheet to be cut can be shortened by this amount of deviation compared to the conventional type in which the leading edges of both sheets are aligned and developed.

After the developer is spread between the positive sheet and the negative film over the image area, the trailing edges of both sheets are placed between the developing roller pair 30.
Before crossing the nip between a and 30b, the cam 2 shown in FIG.
2 rotates and pushes down the arm 23 that engages with it, centering on the fulcrum 25. A developing roller 30b is rotatably attached to the arm 23, and is pushed down together with the arm 23, so that the developing roller 30b is separated from the other developing roller 30a. After that, the rotation of the developing roller pair is stopped. The separation timing is determined by counting the time since the sensor 15 detects the trailing edge of the positive sheet. As a result, the distance between the negative film and the positive sheet 1- increases, and excess developer can be stored between D and D'' shown in FIGS. 2 and 3. The developing roller pair 30a and 30b, which are in close contact with each other, stop and are bitten by the pair of developing rollers 30a and 30b with their rear ends separated, and are ejected from the machine by the operator.Then,
When the tens of paper machine positive sheets are peeled off, the positive image is transferred onto the positive sheet.

The rollers of the pair of developing rollers are separated when the sensor 17 detects the trailing edge of a positive sheet or when the sensor 19 detects a negative film;
This is done by controlling the rotation of the copying machine, and at this time, the next copying operation is prohibited. This prohibition of the copying operation is performed by displaying the copy button inactive, indicating that copying is not possible, etc., or by a combination of these. This can prevent the operator from forgetting to take out the sheet. Further, D shown in FIG. 3 is longer than the length of the rear end D' of the negative film plus the distance from the sensor 17 to the nip of the pair of developing rollers (K in FIG. 6). As a result, as shown in FIG. 6, even if the rear end of the positive sheet remains between the sensor 17 and the nip of the developing roller, the rear end of the negative sheet I is pulled out of the nip and the developer is also removed. Since the developer is stored between both sheets, even if the developing roller is pressurized, the developer will not spill out and stain the developing roller and the like.

After a few seconds have elapsed after the operator takes out both sheets that have been developed and are in close contact with each other, the pair of developing rollers 30 separated from each other are moved to the cam 2.
By the rotation of step 2, the pressurized state is restored again, and the copying operation is prepared for the next copying operation. The rotation timing of the cam is determined by counting the time since the sensor 17 detects the rear end of the positive sheet.

The copying method when only the final photographable portion of the negative film remains in the storage container 8 will be described below. A roll of negative film is provided with a mark, for example a high reflectance mark 40 as shown in FIG. 7, or a notch 41 as shown in FIG. 8 at a certain length from the rear end of the film. . A sensor (not shown) provided near the pull-out roller pair 18 in the transport unit 2 detects the mark 4.
0 or the notch 41 is detected, it is recognized that the negative film in the storage container 8 is the final one.

After the start of the copying operation, the mark 40 is displayed while the negative film is being conveyed.
When the notch 41 is recognized, the rotary blade 20a is controlled not to rotate, and the cutting operation is prohibited.

As shown in FIGS. 7 and 8, the markings 40 and notches 41 are defined by the distance between the rear end of the roll film and the longest roller in the transport unit 2 (from the intermediate roller 27 to the roller 28 in the embodiment shown in FIG. 1). (distance to ) or more distance 1$
Located 1M apart. Thereby, even if the above-mentioned detection is performed immediately after the start of the copying operation, the negative sheet can be transported to the developing roller pair 30 without being left in the machine.

The length of the negative sheet required to form an image in this embodiment is about 360 m, which is longer than the longest distance between rollers of about 150 countries. On the other hand, if the longest distance between the rollers is longer than the length of the negative sheet, the cut negative sheet cannot be conveyed. If the final part of the negative sheet is short, for example, if the above mark is detected immediately after the start of the copying operation, the length of the negative sheet will become shorter than the length of the negative sheet necessary for image formation, making it impossible to form one image. , Furthermore, when the positive sheet and the leading edge are shifted by J and discharged, the 9th
As shown in the figure, the developer 35 protrudes from the rear end of the negative sheet and stains the developing roller. If the developing roller pair 30 becomes dirty, its straightness will be impaired and the developer will not be able to be spread uniformly.
This will have a negative effect on the image. The distance from the rear edge of the negative film to the above mark is the length of the negative sheet required for image formation (approximately 360o
n) The above problem can be solved by doing the above, but if no jam occurs during normal operation, the above detection will not occur when the positive sheet runs out, so only the negative film will remain in the storage container 8, and that amount will be wasted. become. From the above, it is desirable that the distance from the rear end of the negative film to the detection object be as short as possible.

In this embodiment, after the sensor provided near the pull-out roller pair 18 detects the leading edge of the negative film, the marker 4
The time until 0 or 41 is detected is counted, and the subsequent operation is divided into two depending on the count time. Since the unloading conveyance speed is always constant, the distance from the leading edge of the negative film to the mark 40 or 41 at that time can be determined from the above-mentioned count time. This is because the distance M from the marker to the trailing edge of the negative film is constant and known (approximately 150 nwn).

By calculating the final negative film length L+M,
The length of the negative sheet at that time can be calculated.

If the calculated negative sheet length (L+M) is equal to or greater than the required negative sheet length (360+am), the negative film is transported by each pair of rollers without being cut as described above, and is exposed by the optical system unit 1.

At this time, the negative film is pulled out to the end and becomes longer than the normal length of the cut negative sheet.

As described above, the separation timing of the pair of developing rollers is determined by detecting the trailing edge of the positive sheet, which always has a constant length. Furthermore, since the conveying force of the developing roller is lost after the developing roller is separated, there is a possibility that the rear end of the negative sheet is not removed from the roller 34 when the developing roller is separated.

In this embodiment, the roller 34 is connected to the sensor 16 when the negative sheet 1-
After a certain period of time after detecting the trailing edge, rotate until the trailing edge of the negative sheet passes the nip of the roller 34 yJA! I! ! j is done. Therefore, after the above-mentioned separation, the negative sheet is carried along with the positive sheet closely adhered by the spread developer, and is conveyed until the rear end passes the nip of the roller 34 and then stopped.

In the case of a negative sheet cut to a regular length by normal operation, after the sensor 19 detects the rear end of the negative sheet, the sensor 17 detects the rear end of the positive sheet. As described above, when the developing roller pair 30 is returned to the pressurized state after a while after the positive sheet trailing edge is detected, if the negative sheet length is longer than the regular length as described above, the negative sheet trailing edge is not developed. The sheets are bitten by the pair of rollers 30, making it impossible to take out both sheets easily. In another proposal of the present invention, when the rear end of the positive sheet is detected by the sensor 17.

If the rear end of the negative sheet does not exceed the nip of the roller 34, the developing roller pair 30 is returned to the pressurized state after a certain period of time after the sensor 19 detects the rear end of the negative sheet 1.

This eliminates the above-mentioned problem and allows the operator to easily take out both seams. Both sheets are taken out with the photosensitive surface of the negative sheet and the image receiving surface of the positive sheet facing each other with the developer spread therebetween, with the negative sheet facing upward. When the length L+M of the final negative sheet shown in FIGS. 7 and 8 is 360 m or more, a mark 40 or a notch 41 exists between the entire length N of both sheets taken out, as shown in FIG. 10. in this case.

If the mark to be detected is present in the negative sheet image forming section 43, image formation of that portion cannot be performed.

In this embodiment, the high reflectance mark 4o is provided on the back side of the photosensitive surface of the negative sheet, or in the margin E' shown in FIG. 2 when it is located on the photosensitive surface side. The notch 41 is provided at a location outside the edge controller (not shown). By doing so, good image formation is ensured without the image forming area being attacked by the mark and without the developer leaking from the notch.

The final negative sheet length L + M is the required negative length (360I)
If it is less, as mentioned above, it will not be possible to form an image for the required length, and the developer will protrude from the rear end, staining the roller, and having a negative effect on the image. Therefore, in this embodiment, normal image formation is not performed in such a case. . The operation at this time will be explained below.

In the above case, the negative sheet is not cut and the roller pair 18.
27 and the like to a pair of rollers 34. In this case, the optical system unit 1 can prohibit scanning and not perform exposure. When the leading edge of the negative sheet is detected by the sensor 19 shown in FIG. 5, or after a certain period of time, the developing roller pair 30 is separated. At this time, the first
As shown in Figure 1, when the negative sheet and the positive sheet pass together, the developing roller pair maintains a distance that will prevent the developer pound attached to the leading edge of the positive sheet from being crushed.
The rotational position of the cam 22 is set.

The roller 38 is driven to rotate until the rear end passes the nip of the roller 38 after a certain period of time after the rear end of the positive sheet is detected by the sensor 15, and then stops.

The roller 34 is also driven to rotate until the rear end passes the nip of the roller 34 after a certain period of time after the rear end of the negative sheet is detected by the sensor 16, and then stops.

As shown in FIG. 5, the roller pair 34 is arranged so that the distance P from the nip of the roller 34 to the discharge port is shorter than the distance M (approximately 150 m) from the marker to the rear end of the negative sheet. Thereby, even if the length of the negative sheet is M, which is the minimum length of the negative sheet, the leading end can be taken out from the discharge port.

Similarly, as shown in FIG. 5, the rollers 38 are arranged so that the distance Q from the nip of the roller pair 38 to the discharge port is shorter than the length of the positive sheet. Thereby, if the rear end of the positive sheet exceeds the nip of the roller 38, the leading end can be taken out from the discharge port.

As described above, the negative sheet and the positive sheet are not bitten by the pressurized rollers, and therefore can be easily taken out of the machine without any load. Therefore, there is no possibility that Negashi I will be left behind on board the aircraft. Further, the positive sheet can be taken out in a reusable state without crushing the developing pad attached to the tip, and since the positive sheet is not photosensitive, waste of the positive sheet can be prevented.

When a negative sheet becomes jammed in the negative sheet conveyance path or when a cutting error occurs, the developing roller pair 30 has already been removed.
Automatically ejects positive sheets that are inserted close to each other.

At this time, as shown in FIG. 11, the developing roller is discharged with a distance greater than the distance that will prevent the developing pond from being crushed, and the positive sheet can be discharged and taken out in a reusable state. As a result, it is possible to prevent forgetting to take out a positive sheet when a negative sheet is jammed, and to prevent double insertion of a positive sheet.

According to the invention set forth in Claim 1 of the Patent Claim, when the detection means provided on the upstream side of the developing roller pair in the image-receiving sheet conveyance path still detects the image-receiving sheet after the copying operation is completed, Since both developing rollers are separated and the next copying operation is prohibited, even if copying is completed and you forget to take out the photosensitive sheet and image-receiving sheet that are in close contact with each other, the developing roller will not be pressurized. It is possible to prevent excess developer from spilling out and staining the developing roller and the like.

Further, according to the invention set forth in claim 2, the rear end of the image receiving sheet passes the detecting means and the developing rollers are pressed against each other, and the rear end of the image receiving sheet remains between the detecting means and the developing roller. Even in this case, since the rear end of the photosensitive sheet protrudes from the nip of the developing roller, the developer accumulated between the two sheets is not squeezed out.

Further, according to the invention of claim 3, even when the final portion of the photosensitive sheet has a length larger than the required length, for example, it is possible to ensure the ejection of the final portion.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an instant photographic device according to the present invention;
Fig. 2 is a perspective view of a rolled negative film and a negative sheet cut from it, Fig. 3 is a perspective view of a positive sheet and a carrier sheet supporting it, and Fig. 4 is a front view of a pair of developing rollers, showing both rollers. 5 and 6 are explanatory diagrams showing the vicinity of the pair of developing rollers, and FIGS. 7 and 8 are cross-sectional views of the positive sheet and negative sheet sandwiched between them. A perspective view of the film; FIG. 9 is a perspective view showing the overlapping state of both positive and negative sheets when the negative sheet is short; FIG. 10 is a perspective view showing the overlapping state of both sheets when the negative sheet is longer than the required length; FIG. 11 is an explanatory view showing that both the superposed sheets pass between spaced apart developing rollers. 1...Optical system unit 11...Negative film 11'...Negative sheet (photosensitive sheet) 12...Developer pond 17...Sensor (detection means) 30, a, 30b=lQ Image roller pair 31...Carrier seat 1- 32...Positive sheet (image receiving sheet) D...Distance from the rear end of the positive sheet to the carrier seat 1 D'...Distance from the rear end of the negative sheet to its rear end ffi Distance K to the rear end of the finely formed surface...Distance from the developing roller nip to the detection means Agent Patent attorney Takehisa Ito H Figure Figure 9 Figure Figure 8 Figure 10 Figure 11

Claims (3)

[Claims] (1) Using a photosensitive sheet and an image-receiving sheet, both sheets are passed between a pair of developing rollers to form an exposed latent image using an optical system, and the latent image forming surface of the photosensitive sheet and the image-receiving surface of the image-receiving sheet are In an instant photographic apparatus in which a latent image on a photosensitive sheet is colored by cleaving an enclosed developer and the coloring agent is transferred onto an image-receiving sheet, the image-receiving sheet is transported on the upstream side of the pair of developing rollers. and detecting means is provided near the developing roller, and if the detecting means still detects the image receiving sheet after the copying operation is completed, both developing rollers are separated and the next copying operation is prohibited. (2) The image-receiving sheet is pasted on the carrier sheet, and the distance from the rear edge of the image-receiving sheet to the rear edge of the carrier sheet is the distance from the rear edge of the photosensitive sheet to the rear edge of the latent image forming surface formed on the photosensitive sheet. 2. The instant photographic apparatus according to claim 1, wherein the image receiving sheet is attached to the carrier sheet so as to be longer than the distance from the developing roller pair nip to the detecting means. (3) Using a photosensitive sheet and an image receiving sheet, both sheets are passed between a pair of developing rollers to form an exposed latent image using an optical system, and the latent image forming surface of the photosensitive sheet and the image receiving surface of the image receiving sheet are separated. In an instant photographic device in which a latent image on a photosensitive sheet is colored by cleavage of an enclosed developer and the coloring agent is transferred onto an image-receiving sheet, a roller is placed upstream of the developing roller pair in the conveyance path of the photosensitive sheet. An apparatus characterized in that a detecting means is provided near the developing roller, and when the detecting means still detects the photosensitive sheet after the copying operation is completed, both developing rollers are separated and the next copying operation is prohibited. .