JPH09211790A - Microfilm cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve contact between a photographing roller and film by switching a nip roller by a switching operator so that only the nip roller on a film supply side may be elastically brought into contact and the other may be separated. SOLUTION: When a cassette is attached with its front surface side out, the switching operator 99 is turned clockwise. In such a case, while the nip roller 96A on the take-up side of the photographing roller 76 is allowed to float from the roller 76, the nip roller 96B on the supply side is pressed to the photographing roller 76 by a cam 99C. When the cassette is inverted and attached with its back surface side out, on the contrary, the switching operator 99 is turned counterclockwise. While the nip roller 96B on the take-up side of the roller 76 is allowed to float from the roller 76, the nip roller 96A on the supply side is pressed to the roller 76 by the cam 99C. When the cassette is attached upside down, only either the nip roller 96B on the supply side (or 96A) is always pressed to the roller 76.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microfilm cassette which accommodates a roll film for photographing a document original by a slit exposure method and enables photographing by a duo photographing method.

[0002]

2. Description of the Related Art A microfilm camera for photographing a document original on a roll film by a slit exposure method is known which uses a cassette containing a roll film.

In this cassette, in addition to a supply reel and a take-up reel on which the roll film is wound from both ends, a photographing roller around which the roll film is wound is accommodated. Then, the roll film wound around the photographing roller is exposed inside the photographing opening provided in the cassette, and the image of the original is transferred onto the roll film through the photographing opening.

On the other hand, there is a duo method (reciprocal photographing method) as a method of photographing an original on a roll film. FIG. 18 is an explanatory diagram of this duo system. In this system, one side of the roll film F is photographed one by one in the length A direction and the B zone of the roll film F one by one in the length direction of the film F. When the one side is finished, the film F is reversed. It is a method of loading and sequentially shooting the opposite side. In FIG. 18, 1,
2, ... 1000 is the frame number of the frame in the A zone, and 1
001 to 2000 are frame numbers of frames in the B zone.

When the roll film stored in the cassette is photographed by such a duo system, it is necessary to turn the cassette over when changing from photographing in the A zone to photographing in the B zone. At this time, the actions of the supply side reel and the winding side reel in the cassette are reversed. That is, the take-up reel forcibly takes up the roll film, and the supply-side reel always takes out the film while applying a reverse tension to the roll film, but when the shooting zone changes, the take-up reel is taken up. It is necessary to change the side reel to the supply side reel and the supply side reel to the winding side reel.

It is necessary that the roll film is always fed in close contact with the photographing roller during photographing in order to prevent deterioration of photographing quality. Therefore, conventionally, a torque in the reverse direction is applied to the supply reel so that the supply reel always applies tension to the film in the direction opposite to the feed direction, and a pair of nip rollers is provided. The nip roller is configured to bring the film into close contact with the photographing roller by sandwiching a roll film wound around the photographing roller from both sides of the photographing roller. That is, a pair of nip rollers is provided so as to press the roll film against the photographing roller on both sides of the photographing position where the image is incident on the roll film. By pressing the film with the two nip rollers in this way, the same film feeding state can always be obtained even if the film feeding direction changes.

[0007]

2. Description of the Related Art The conventional structure functions properly when the feed speed of the roll film is constant or when the change range of the feed speed is small. However, it has been found that when it is necessary to increase the change range of the feed rate of the roll film, the film may be separated from the photographing roller and the image quality of the image may be deteriorated.

In these various conventional rotary type microfilm cameras, the original feeding speed is always constant and the photographing reduction ratio is usually switched within the range of 1/24 to 1/50. Then, I could change the film feed speed within the range of about twice. However, the applicants of the present application are considering changing the document feeding speed in accordance with the photographing reduction ratio.

That is, when the reduction ratio is small, for example, 1/24, the original is fed at high speed (for example, 60 m / min), and when the reduction ratio is large, for example, 1/50, the original is fed at low speed (for example, 1).
5 m / min). By doing so, the captured image density can be increased and the image quality can be kept high even if the reduction ratio is large, and the processing speed can be increased when the reduction ratio is small.

In this case, the feed rate of the film is such that the change rate of the reduction rate (twice) and the change rate of the document feed rate (60/1).
5 = 4 times), and it is necessary to change within a range of about 8 times. In other words, in contrast to the conventional type, it was sufficient to switch the film feed direction within the double speed change range.
It must be able to handle changes in the film feed direction within a range of eight times the speed change.

In the conventional two-nip roller elastically contacting the photographing roller at the same time, especially when the film feed direction is changed by widening the change width of the film feed speed as described above, the film feed speed is increased. It has been found that when the value is large, the film slightly lifts from the taking roller and the taken image quality is degraded.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it goes without saying that the change width of the feed speed of the roll film is small, but even if the change width is large, the duo An object of the present invention is to provide a microfilm cassette in which the roll film is always brought into close contact with the photographing roller during photographing even when the film feeding direction is changed depending on the photographing method, and the quality of the photograph is not deteriorated.

[0013]

According to the present invention, an object of the present invention is to provide a pair of reels on which roll film is wound from both ends, and an image which is wound between both reels and which is incident from a photographing opening provided on a case. In a micro film cassette capable of shooting with a duo shooting method, the shooting roller for shooting with a slit exposure method is elastically contacted from both sides with the center line of the case passing through the center of the shooting roller. A pair of nip rollers,
And a switching operator for selectively separating the nip roller on the winding side from the photographing roller in response to switching of the feed direction of the roll film.

If the switching operator is provided with an operation position where both nip rollers can be separated from the photographing roller at the same time, it becomes easy to replace the roll film and the film is pressed by the nip roller for a long time when not photographing. It will not hurt you. In addition, in order to prevent mistakes in the loading direction of the cassette when shooting with the duo shooting method, a lock mechanism that prevents the cassette from being loaded in the reverse direction is provided in conjunction with the switching operator that lifts one of the nip rollers from the shooting roller. be able to.

[0015]

1 is a perspective view showing the appearance of an embodiment of a microfilm photographing apparatus using a cassette according to the present invention, FIG. 2 is a conceptual diagram of this photographing apparatus, and FIG. 3 is a side view showing an internal structure. Fig. 4, Fig. 4 is a plan view, Fig. 5 is a view taken in the direction of arrow V in Fig. 4 for showing the optical system of the microfilmer, Fig. 6 is a perspective view of this optical system, and Fig. 7 is a plan view showing the internal structure of the cassette. FIG. 8 is a plan view showing a state in which the cassette is turned upside down, FIG. 9A is a sectional view taken along line IX-IX in FIG. 7, and FIG. 9B is a view showing a state in which the cassette is turned upside down. ,
10 is a plan view near the photographing roller, FIG. 11 is a sectional view taken along line XI-XI in FIG. 10, FIG. 12 is a sectional view taken along line XII-XII, FIG. 13 is a perspective view showing a nip roller and a switching operator, and FIG. FIG. 15 is a plan view showing a state in which one nip roller is lifted from the photographing roller by a switching operator, FIG. 15 is a plan view showing a state in which the other nip roller is lifted from the photographing roller, and FIG. 16 is a state in which a cassette is loaded in the state shown in FIG. 17 is a front view showing a state in which a cassette is loaded in the state of FIG.

1 to 4, reference numeral 10 is a scanner, 1
2 is an auto feeder (auto document feeder, abbreviated as ADF), 14 is a microfilmer to which the present invention is applied, 16 is a turn unit, and 18 is a stacker. The auto feeder 12 is detachably attached to the front of the scanner 10. The microfilmer 14 has a housing 20 formed in an L shape in plan view (FIG. 4).
0 surrounds the rear surface and the left side surface of the scanner 10. 2 to 4, reference numeral 22 denotes a multi sorter, which can be replaced with the turn unit 16.

1 and 4, reference numeral 24 is a control unit, which is composed of a display 26 and a keyboard 28. The control unit 24 is for performing status display and condition input / setting for controlling the entire apparatus. For example, for the scanner 10, selection of reading conditions
Settings such as selection / setting of a shooting mode are performed for the microfilmer 14.

In FIG. 2, 30 is a personal computer (P
C, workstation WS may be used), image information and attribute information read by the scanner 10 are input,
The image is subjected to predetermined image processing and stored in a storage device such as the magneto-optical disk 32. It also outputs to a printer (not shown) as needed. It can also be transferred to another computer or image processing apparatus.

The scanner 10 includes an auto feeder 12 to 1
It has a conveying means for horizontally and linearly feeding the documents (original documents) 34 taken in one by one toward the rear. First, the document 34 is read by a barcode reader (BCR) 36, which is a barcode attached to a predetermined position of the document 34. This bar code determines the condition setting based on the document format number, etc.
It includes information for automatically selecting the reading conditions of the CR 42 and the image scanner 44 from preset modes.

In this mode, for example, the image cutout position, single-sided / double-sided reading, scanner 10 on / off discrimination,
And so on. This read data is PC
It is sent to the (WS) 30, and the PC (WS) 30 sends an instruction number for the PC to the imprinter 40 described later. The barcode reader 36 may be an OCR (optical character reader) that reads characters instead of the barcode.

Document 34 is then patch reader 38 (FIG. 3).
Pass through. The patch reader 38 detects switching information of marks such as a blip attached when photographing a microfilm. For example, large / medium / small classification data can be distinguished by the type of partition plate inserted between documents. To detect. The patch reader 38 may detect information for automatically switching on / off of the scanner 10. These data are transferred as document or page attribute information to the external PC (WS) 30 via the data transfer interface.

The document 34 is then transferred to the imprinter (IMP) 4
Numbered by 0. For example, an instruction number output by the PC (WS) 30 to the output of the barcode reader 30 or a number indicating the order of the documents 34 set by the control unit 24 is added. Next, OCR42 is document 34
The document number or the like attached to is read and sent to the PC (WS) 30. This data is stored in the memory as document or page attribute information together with the image information read by the image scanner 44, which will be described later.
(WS) 30.

Image scanners (CCD) 44 and 44
And has a CCD line sensor. That is, for images on the front surface and the back surface of the document 34 moving at a constant speed,
Each line sensor is arranged so as to be orthogonal to the image moving direction, and the image is continuously read as the document 34 moves (moves in the sub-scanning direction). That is, the image is read by the slit exposure method.

In this CCD 44, the instruction input from the control unit 24 and the PC (WS) 3 in advance are used.
The image of a partial area of the document is cut out from 0 according to the input instruction, and transferred to the PC (WS) 30 via the interface together with the attribute information of the image. In addition, the mode is automatically selected from the format number of the document 34 read by the BCR 36, the cutting position, single-sided / double-sided, scanner on / off, etc. are determined, and the image is read according to the determination result. To do. Furthermore, conditions such as the cut-out position designated by the PC (WS) 30 are obtained based on the document format number detected by the BCR 36, and the image data along with other attribute information is sent to the PC (WS) 3
You may make it transfer to 0.

When this device is used as a scanner, as shown in FIG. 2A, a turn unit 16 is connected to the rear surface of the scanner 10. The turn unit 16 makes a U-turn of the document 34 discharged from the rear surface of the scanner 10 upward, and feeds the upper portion inside the scanner 10 in the reverse direction.
Then, the stacker 1 provided on the upper front surface of the scanner 10
Collect in 8. The stacker 18 includes a path stacker 46 (FIG. 1) that reverses and stacks documents that have undergone normal image reading processing in the same order, and a reject stacker 48 that separates and stacks documents 34 that need to be reprocessed when an error occurs.
(Fig. 1) and. The reject stacker 48 can also be used to divide the processed documents into two groups and classify and collect only one of the groups.

On the connection surface between the turn unit 16 and the scanner 10, a separable joint (not shown) is provided for transmitting the driving force of the conveying roller in the scanner 10 to the turn unit 16 side. Therefore, in the state of FIG. 2A in which the turn unit 16 is connected to the scanner 10, the document can be conveyed at the same speed in the scanner 10 and the turn unit 16. Documents that are too thick to be transported in the turn unit 16 are collected in the straight stacker 50.

A multi-sorter 22 may be connected instead of the turn unit 16. The multi-sorter 22 sorts and stacks the processed documents 34 discharged from the scanner 10 and stacks thick documents on the straight stacker 5 as well.
Collect at 0A.

The above construction is of the scanner type shown in FIG. 2A. However, when a microfilm photographing function is added to this apparatus, the microfilm camera or microfilmer of the embodiment of the present invention is used. 14
It is interposed between the scanner 10 and the turn unit 16. FIG. 2B shows the structure of the scanner / microfilmer type in this way. Micro Filmer 1
As described above, 4 has an L-shaped housing 20 in a plan view, and an optical system for guiding images on both the front and back surfaces of the document 34 to a microfilm is housed in the housing 20.

As shown in FIGS. 4 to 6, this optical system is long in the direction orthogonal to the conveying direction of the document 34 (direction of arrow A in FIG. 6) and is diagonally opposed to the front and back surfaces.
The mirror 52 and the second mirror 54, and both mirrors 52, 5
The third that simultaneously reflects the front and back images shown in FIG.
A mirror 56, a fourth mirror 58 and a fifth mirror 60,
It has two sets of taking lenses 62, 62.

The photographing lenses 62, 62 face the microfilm cassettes 64, 64.
66, which is housed in a car and runs at a constant speed
(FIG. 6) is photographed by the slit exposure method. For this reason, as shown in FIG.
The images on the front surface and the back surface are imaged side by side in the width direction of the film 66 (duplex imaging method).

When the front and back sides of the document 34 are simultaneously lined up in the width direction of the film with the microfilm 14 (duplex photographing method), these mirrors 5 are used.
2 to 60, images on both the front and back sides of the document 34 are simultaneously taken, but the cassette of the present invention can use the duo photography method. In this case, only one of the front and back sides of the document 34 is film 66. Shoot within 1/2 width. That is, when only the front side is photographed by the duo photographing method, the second mirror 54 is removed, and the photographing is performed only within the half width under the film 66 (A zone, see FIG. 18).

Here, the cassettes 64, 64 are inserted from the front into a loading chamber 67 that opens vertically in two steps on the front of the housing 20, that is, on the left front of the stacker 18. This loading chamber 6
7 is covered with a cover 68 after the cassettes 64, 64 are loaded to prevent external light from entering the loading chamber 67. Thus, by arranging the cassettes 64 in upper and lower two stages and simultaneously photographing the images of the same document, two microfilms can be simultaneously photographed, which is efficient. Of course, only one cassette 64 can be loaded so that only one microfilm can be photographed.

As shown in FIGS. 7 and 8, the cassette 64 has a rectangular case 70 which can be opened and closed vertically, and reels 72 and 74 and a photographing roller 76 are sequentially arranged in the longitudinal direction thereof. Case 7 where the shooting roller 76 faces
An opening 78 for photographing is provided on the wall which is the short side of 0,
A shutter 80 is slidably provided along the inner surface of the wall. The shutter 80 is provided with a window (not shown) for opening and closing the opening 78.

Here, the center of the photographing roller 70 is the case 7
It is located on the center line CL passing through the center of the short side of 0 and parallel to the long side. Further, the centers of the two reels 72 and 74 are located on the parallel line PL which is deviated to one side with respect to the center line CL. One of these reels 72, 74 is the supply side (S), and the other is the take-up.
Side (T).

Now, when the cassette 64 is loaded in the direction shown in FIG. 7, the reel 74 becomes the take-up side (T),
The reel 72 becomes the supply side (S). When the cassette 64 is turned upside down and loaded in the direction shown in FIG.
Is the winding side (T), and the reel 74 is the supply side (S). The take-up side (T) reel 72 or 74 is driven in the direction indicated by the arrow shown in FIGS. Further, a predetermined torque is applied to the supply side (S) reel 74 or 72 in the direction indicated by the broken line arrow and rotates in the direction opposite to the broken line arrow as the film 66 is fed. As a result, a predetermined tension is applied to the film 66.

The shutter 80 provided in the cassette 64 is guided by the guide pin, one end of which is pulled by the coil spring 82, and the pin 84 attached to the other end is guided by the guide elongated hole 86 and is movable. This pin 84 is attached to the guide elongated hole 8 by a slide member 88 provided in the case 70.
6 is transferred. That is, the pin 84 is guided and moved by the long hole 90 and the guide long hole 86 provided in the slide member 88, and pulls and moves the shutter 80.

The slide member 88 is used when the cassette 64 is loaded into the cassette loading chamber 67.
It engages with a claw (not shown) provided on the inner surface and is pushed downward in FIGS. Along with this, the pin 84 moves downward in the elongated hole 86 and pulls and moves the shutter 80, and the window thereof is aligned with the opening 78 of the case 70. As a result, the opening 78 is opened and the camera is ready for shooting.

In the state of FIG. 7, the film 66 is guided from the supply side (S) reel 72 by the three guide rollers 92 and wound around the photographing roller 76, and further passed through the other guide rollers 94 to the winding side. It is wound around the reel 74 of (T). In the state of FIG. 8, the reel 74 is on the supply side (S) and the reel 72 is on the take-up side (T).
6 is sent in the reverse direction. Nip rollers 96A and 96B are pressed against the film 66 that is in close contact with the photographing roller 76 from both sides to ensure the close contact between the film 66 and the photographing roller 76.

The nip rollers 96A and 96B are held at the tips of levers 98A and 98B that are long in the longitudinal direction of the case 70. A torsion spring (not shown) imparts a habit of returning to the photographing roller 76 side to the levers 98A and 98B.

Both nip rollers 96A and 96B are
Either or both of them can be separated from the photographing roller 76 by the switching operator 99. As shown in FIGS. 10 to 13, the switching operator 99 includes a donut-shaped disc 99A and a tubular portion 99B that projects axially from the inner peripheral edge of the disc 99A.
And a cylinder portion 99B is attached to one surface of the case 70 of the cassette 64 so as to be concentric with the photographing roller 76.

On the outer peripheral surface of the cylindrical portion 99B, a cam 99C protruding in the outer peripheral direction is provided in a protruding manner. The cam 99C is located within a range of about ⅔ of the outer circumference of the tubular portion 99B. The levers 98A and 98B of the nip rollers 96A and 96B have claws 98A and 98A (see FIG. 1) that come into contact with the cam 99C.
2, 13) are provided. Therefore, the switching operator 9
9 when placed in the neutral position shown in FIG.
Pushes open both claws 98A, 98A, and separates both nip rollers 96A, 96B from the photographing roller 78 at the same time. In this state, the case 70 is opened and the film 66 is
It is convenient to exchange

A disc-shaped lock dial 97 is attached to the upper surface of the case 70 adjacent to the switching operator 99. A lock plate 97A is fixed to a shaft of the lock dial 97 protruding into the case 70 (see FIG. 1).
1). The lock plate 97A can be engaged with and disengaged from a column 97B that is erected on the back cover of the case 70. Therefore, when the film 66 is replaced, the lock dial 97 is rotated to rotate the lock plate 9
7A is released from the pillar 97B, the case 70 is removed, and the case 70 is opened up and down. Further, when the switching operator 99 is set to the neutral position in FIG. 10, the film 66 can be easily attached to and detached from the photographing roller 76.

When the cassette 64 is loaded in the direction shown in FIG. 7 (face-up), the switching operator 99 is rotated clockwise in FIG. FIG. 14 shows this state. The cam 99C presses the nip roller 96B on the supply side against the photographing roller 76 while the nip roller 96A on the take-up side (T) of the photographing roller 76 is lifted from the photographing roller 76. On the contrary, when the cassette 64 is turned over and loaded in the direction of FIG. 8 (face down), the switching operator 99 is rotated counterclockwise in FIG. FIG. 15 shows this state, and the cam 99C presses the nip roller 96A on the supply side (S) against the photographing roller 76 while the nip roller 96B on the take-up side (T) of the photographing roller 76 is lifted from the photographing roller 76.

Thus, even when the cassette 64 is loaded upside down, only one of the supply side (S) nip roller 96B (or 96A) is pressed against the photographing roller 76, so that the film 66 is always wound. Tension is applied by the reel 72 (or 74) on the taking side (T). Therefore, the film 6 should be kept in close contact with the outer peripheral surface of the photographing roller 76 at all times.
6 is sent, and it will be stable even when the film 66 is sent at high speed.

In this embodiment, a lock mechanism composed of lock plates 95A and 95B is provided in order to prevent the cassette 64 from being loaded in the wrong direction. These lock plates 95A, 95
As shown in FIGS. 10 and 13, B has the nip roller 9 at the inner end.
6A and 96B are brought into contact with levers 98A and 98B, and their outer ends are provided so as to project from the side surface of the case 70. These lock plates 95A and 95B have a habit of returning to the inner end side by a spring (not shown).

On the other hand, on the inner surface on the left side of the cassette loading chamber 67, as shown in FIGS.
67B is formed. When the cassette 64 is loaded in the direction (front side) shown in FIG. 7, the switching operator 99 is rotated to bring the nip roller 96B into contact with the photographing roller 76 as shown in FIG. Only the lever 98A holding the nip roller 76A is in a state of pushing the one lock plate 95A outward. Therefore, the outer end of only the lock plate 95A projects to the left side surface of the case 70.

The lock plate 95A is provided in the upper groove 97A.
The outer end of is engaged and slidable. Therefore, the cassette 64
Can be loaded in this direction. But this cassette 64
If you try to load the
The outer end of the contact portion abuts on the inner surface of the other side of the loading chamber 97. Therefore, it is possible to prevent the front and back of the cassette 64 from being mistaken.

The cassette 64 is oriented as shown in FIG. 8 (face down)
When loading the sheet, the switching operator 99 is rotated to bring the nip roller 96A into contact with the photographing roller 76 and release the nip roller 96B. Therefore, only the lock plate 95B is projected, and when the cassette 64 is loaded into the loading chamber 76 in this state, the outer end of the lock plate 95B is engaged with the lower groove 95B. Therefore, the cassette 64 can be loaded, but when the cassette 64 is turned upside down, the outer end of the lock plate 95B comes into contact with the other side surface of the loading chamber 76 to prevent the loading.

Further, in the state of FIG. 10 in which the switching operator 99 is in the neutral position, both nip rollers 96A and 96B.
And the lock plates 95A and 95
Both outer ends of B project to both side surfaces of the case 70. Therefore, the cassette 64 is not loaded in the loading chamber 76.

Reference numerals 100 and 100 are mark photographing lenses which are disposed adjacent to the sides of the photographing lenses 62 and 62. The optical axes of these lenses 100, 100 are inclined with respect to a line perpendicular to the film 66 in the film length direction, that is, the film running direction. Also, on this optical axis, for example, L
A digital image generator 102 (see FIG. 6) including an ED (light emitting diode) array is arranged in the film width direction.

The digital image generator 102 simultaneously imprints marks on the two microfilms 66, 66 through the mark photographing lenses 100, 100. At this time, in case of duo photography, the mark is imprinted only on the zone side during photography. For example, in FIG. 15, when shooting in the A zone on the outward path, a mark M such as a search blip is attached near the edge of the film on the A zone side.

The digital image generator 102 generates a one-dimensional image which changes in synchronization with the traveling speed of the film 66, and the image is taken through the lens 100 on the traveling film 66. Therefore, in addition to the above-mentioned search mark, other data can be imprinted on the film 66 adjacent to or over the image of the document.

The case 70 of the cassette 64 is curved outward so that the short side 70A (see FIGS. 7 and 8) facing the photographing lens 62 is symmetrical about the central photographing opening 78. . When the cassette 64 is loaded in the cassette loading chamber 67, the short side 70A side of the case 70 is shown in FIG.
As shown in FIG. 8, the positioning members 67A, 67A are contacted and positioned. Since the short side 70A is curved, in this state, the vicinity of the center of the short side 70A is located on both positioning members 67A, 6A.
It approaches the taking lens 62 side from between 7A.

Therefore, the optical axis of the mark photographing lens 100 is less likely to interfere with the edge of the opening 78 of the case 70, and the layout design of the lens 100 is facilitated. Also the opening 7
The size of 8 can also be reduced, and accordingly, the movement amount of the shutter 80 is also reduced. As a result, the drive mechanism of the shutter 80 can be downsized, and a rational arrangement suitable for downsizing the cassette 64 can be achieved.

In the above embodiment, when the document feeding speed is changed in accordance with the change of the photographing reduction ratio, the film 6 is used.
The effect of the present invention is particularly remarkable because the range of change in the feed rate of No. 6 is also expanded. However, the present invention includes a case where the document feed speed is kept constant and only the reduction ratio is changed, and a case where the change range of the film feed speed is relatively small is included.
In addition, the present invention also includes a constant film feed speed, and in such a case, the film feed speed is stable,
The effect of the present invention is that the image quality of a photograph can be improved.

[0056]

As described above, according to the first aspect of the present invention, in the cassette used for the duo photographing method, of the pair of nip rollers elastically contacting the photographing roller from both the film supply side and the film winding side, the film supply side is selected. Only the nip roller is elastically contacted and the other is separated by a switching operator.

Therefore, even if the film feeding direction is changed, the film is always fed while being in close contact with the photographing roller by the tension of the reel on the take-up side, and the adhesion between the photographing roller and the film is improved, Feed is stable. As a result, the image quality of the shot is improved. The same effect can be obtained when the film feed speed changes depending on the photographing reduction ratio, and the effect is remarkable especially when the change range of the film feed speed is large.

If both the nip rollers can be separated from the photographing roller at the same time by a switching operator (claim 2), the film can be easily attached to and detached from the photographing roller when the film is replaced, which is convenient. Further, it is possible to prevent the nip roller from pressing the film for a long time when the image is not taken, thereby damaging the film.

If a lock mechanism interlocking with the switching operator is provided so that the cassette can be loaded only when the loading direction is correct (claim 3), it is possible to prevent the cassette from being loaded in the wrong direction.

[Brief description of drawings]

FIG. 1 is a perspective view of a microfilm photographing device using a cassette according to the present invention.

FIG. 2 is a conceptual diagram of this photographing device.

FIG. 3 is a side view showing its internal structure.

FIG. 4 is a plan view thereof.

5 is a view on arrow V in FIG. 4 showing an optical system of a microfilmer.

FIG. 6 is a perspective view of this optical system.

FIG. 7 is a plan view showing the internal structure of the cassette.

FIG. 8 is a plan view showing a state where the cassette is turned upside down.

9 is a diagram showing a cross-sectional view taken along line IX-IX in FIG. 7 and a state in which the front and back of the cassette are reversed.

FIG. 10 is a plan view near the photographing roller.

11 is a sectional view taken along line XI-XI in FIG.

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a perspective view showing a nip roller and a switching operator.

FIG. 14 is a plan view showing a state where one nip roller is floated.

FIG. 15 is a plan view showing a state where the other nip roller is floated.

FIG. 16 is a front view showing a state in which the cassette is loaded with the front side facing up.

FIG. 17 is a front view showing a state in which the back side of the cassette is loaded upward.

FIG. 18 is a diagram showing a duo imaging method.

[Explanation of symbols]

10 Scanner 12 Auto Feeder (ADF) 14 Micro Filmer 24 Control Unit 30 Personal Computer (PC) or Workstation (WS) 34 Document (Original) 64 Micro Film Cassette 66 Roll Film 67 Cassette Loading Room 67A, 67B Lock Plate Recessed groove 70 Cassette case 72, 74 Reel 76 Photographing roller 78 Photographing opening 95A, 95B Lock plate as lock mechanism 96A, 96B Nip roller 99 Switching operator 99C Cam

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication G03B 27/50 G03B 27/50 Z

Claims (3)

[Claims] 1. A pair of reels on which a roll film is wound from both ends, and a photographing roller for photographing an image, which is wound between both reels and is incident from a photographing opening provided on a case, by a slit exposure method. With and
In a micro film cassette capable of shooting by the duo shooting method, a pair of nip rollers elastically contacting the shooting roller from both sides with the center line of the case passing through the center of the shooting roller interposed therebetween, and switching of the roll film feeding direction. A microfilm cassette correspondingly provided with a switching operator for selectively separating the nip roller on the winding side from the photographing roller. 2. The microfilm cassette according to claim 1, wherein the switching operator has an operation position for separating both the nip rollers from the photographing roller at the same time. 3. A lock mechanism which interlocks with a switching operator and regulates a loading direction of a cassette to a correct direction.
Or 2 microfilm cassettes.