JPS5885429A - Film jam detector - Google Patents

Abstract

PURPOSE:To detect the jam of film auto-loading, by generating a jam signal if a minimum loop detecting switch does not count a certain value in a prescribed time after the leading edge of a film enters into a developing device. CONSTITUTION:In the detection of a film jam, when a film is jammed on the passage and is slipped on, for example, a roller 14 not to go forward, a minimum loop detecting switch 16 is not operated. Consequently, the counted value of the first counter 21 does not become a prescribed value, and a flip flop 23 is left set, and the gate of an AND gate circuit 26 is opened; and when the counted value of a counter 24 becomes a prescribed value by the operation of a switch 20, a signal of level ''1'' is issued from a decoder 25. As the result, a signal of level ''1'' is issued from the AND gate 26 to detect the occurrence of the jam easily.

Description

[Detailed Description of the Invention] In a film photographing and developing device that performs processing without photographing, a detection system that detects a film jam when automatically loading the film into the developing device without any manual intervention. It is related to the device.

In microfilm photography, development, and oil production, where photography and development can be performed at the same time, the mechanism for transporting the film or the winding unit for winding the film is in operation as long as the developing device is in operation. For example, if ``Ak shadow is not applied, the film will be pulled out of the photographing device N by the developing device, resulting in problems such as scratches occurring at the film thickness 4iy portion of the photographing device. For this purpose, a film buffer chamber is provided in the photographing chamber of such a photographing and developing device to form a film loop f for temporarily storing the film, and when this film loop becomes the minimum loop. ,vinegar
.

In other words, when tension is released, this is completely detected by the film minimum loop detection switch, and in accordance with the operation of this switch, the film pressure plate is separated from the film surface, and the film is sent into the film buffer chamber by one frame.

Conventionally, in such a film photographing and developing device, in a developing device that automatically loads the film, the film gets caught somewhere in the film path of the developing device, slips, and stops. Even after shooting, the film does not reach the film winding section, so it is only then that the user knows that a jam has occurred in the film path. If such an accident occurs, you may have to reload the film again before shooting again, or to avoid wasting film, you may have to close the film path. A plurality of film sensors are provided, and a timer is activated after the first sensor detects the film, and if the second film sensor does not detect the film while the timer is activated, a jam is detected. There is an example of notifying the operator, but with this method, when the sensor IT is reduced, the timer time becomes longer, which is a hassle as it takes time to set the time, which reduces production. There is a problem with
Also, how many sensors? If f: increases, it is necessary to prepare a large number of timers, which poses a small problem in terms of cost.

The invention is intended to eliminate the above-mentioned problems in conventional film jam detection devices, and there is no need to provide a film sensor element near the film path, so that the film path structure can be improved. It is an object of the present invention to provide an inexpensive film noyam detection device 1^ that is easy to use and has improved reliability because the sensor is not used.

As mentioned above, a form of jam that occurs in the photo-taking device HL, which uses autoloading to advance the film within the path, is that the leading edge of the film gets caught somewhere in the path during loading, and the film is jammed by the film feed roller. In some cases, the film may not advance due to slipping, but in this case, the above-mentioned minimum loop detection function is used.

is not working.

This invention is! Focusing on the fact that the minimum loop detection switch continues to operate in the case that a jam does not occur in Samurai as in the above GC4, even after a predetermined period of time has elapsed since the leading edge of the film entered the developing device, This purpose is achieved by generating a jam signal when the minimum loose detection switch does not count the number of times it is activated.

In other words, Akira Fuji's film jam detection device is a minimum loop detector that detects when the film looseness in the film buffer chamber of the photographing device has become the minimum looseness and feeds the film into the film buffer chamber. , a first argument device that counts the number of times the minimum loose detector is activated, a second counter that counts =-+ the number of times the film has been transferred to the developing device, and a second h1 of the above degree. The percentage sign is that when the count value of the first counter does not reach the predetermined value when the first counter value reaches the predetermined value, a jam signal is generated.

The following is an explanation with reference to the drawings.

FIG. 1 shows a microfilm photographing (5) image developing device in which photographing device A and dust/preparation-1B are integrally photographed and developed.

The photographic device A is equipped with a roll 1. Film projection lens 2I film pressure plate 3. Drive roller 4. Binnarola 5. It has a guide roller 6, a drive roller 7, a film detector 81, and a film buffer chamber 9. Note that the roller 7 may be used as a guide roller without being driven.

The drive roller 4 is rotated in the direction shown by the arrow, and the film 1
The film 0 is pressed against the PMA dynamic roller 4 by the bin roller 5, is sent out from the film roller 1, and is sent through the film buffer chamber 9. The film buffer chamber 9 is a chamber where photographed film is temporarily stored, and when photographing is performed at a speed faster than the film transport speed of the developing device,
A film exhibiting a loop shape as shown in Sanemori 10 is stored in the buffer chamber. When the drive roller 4 rotates, the film pressure plate 3 is lifted in synchronization with the rotation of the drive roller 4 and is brought out of contact with the film surface.

The developing device tB includes a developing and fixing section 11. A washing section 12 and a drying section 13 are provided, a film drive (6) and MUi roller 14 are provided on the front side of the developing device, and a film winding section 15 for winding the developed film is provided on the rear side. Film is usually wound into a roll by a reel.

In the path of the film sent from the scooping device to the developing device,
The film loop above in the film chamber is
The film is stretched between the rolls 4, 5 and 6 in a loose state as shown by the broken line 10'.
) is provided, a minimum loop detection switch ↓6 is provided to detect this minimum loop. The small reed roof detection switch 16 is provided with a movable arm roller 18 that is movably supported by a fulcrum 17.

Here, the operating principle of the minimum roof detection switch will be explained.As shown in FIG.
1. However, if the film in the film buffer chamber 9 in the photographing device A is in a loop shape as shown by the solid line 10, the film is transferred to the pinch roller 5 which is in pressure contact with the film drive roller 4. Since the film is held down and pressed against the pressure plate 3 for making the film flat when taking pictures, the film cannot be easily pulled out, and the arm roller 18 with 17 as the fulcrum is moved by the film. , and is pushed into a position indicated by the dowel 18'. The switch 16 is then actuated by the roller 18'. Here, the roller diameter is set so that the amount of feed by the film moving roller 14 is slightly larger than the feed amount of the WRITB roller 7. pulls out one frame of Kasushiku film from roller 1 into the film buffer chamber.

In the above-mentioned photographing and developing device, σ et al.
A cam 19 that rotates in conjunction with the film feed roller and a microswitch 20 that is turned on and off by this cam are arranged in the film path between the two. There is.

That is, since the cam 19 rotates in conjunction with the film feed roller, by counting the number of times the switch 20 is turned on and off, the total amount of film transferred to the developing device can be determined.

When operating the photographing and developing apparatus described above, the operator loads roll 1 of unexposed film into photographing apparatus A, drives roller 4. When the film is routed around the guide roller 6 and then the leading edge of the film is positioned on the roller 7 portion on the developing device side, the film is detected by the film sensor 8 and power is supplied to the forming/imaging device. Accordingly, the film Ii@roller begins to rotate, and the operator inserts the film up to the drive roller 14 and confirms that the film has been transferred by the roller. In this case, the film looseness in the film buffer chamber 9 is made to create a minimum loop f in the buffer chamber as shown by the broken line 10'. When the film begins to be transported by drive roller 14, switch 16 is turned on to move roller 18 to position 18'. The ON signal of this switch 16 (9) is used to automatically rotate the film drive roller 4, so that one frame of film is fed into the film buffer chamber 9, and along with this, the roller 18 is rotated. dashed line 10
Return from the position of ' to the position of the solid line.

Then, when the film 10 in the film buffer chamber forms a loop as shown by the broken line 10', the roller 18 moves again to the position indicated by the broken line 18' and the switch 16 is turned on again.

The present invention attempts to detect a film jam by using a minimum loop detection switch in a photographing and developing device as described above, and includes a first counter that counts the number of times the minimum loop detection switch is activated; a second counter that counts the number of buttons through which the film is transferred to the developing device; and a second counter that counts the number of buttons on which the film is transferred to the developing device; This feature is characterized in that a jam signal is generated when the jam signal is not set.

An embodiment of the present invention is shown in FIG.

In FIG. 2, 21 is a first (10) counter that counts the number of times the minimum loose detection switch 16 has been repeatedly turned on and off;
a decoder that outputs a 0” level signal when
24 is a flip-flop that can be reset by the output signal of the decoder 22;
A second counter counts the number of times the switch is turned off; 25 is a decoder that outputs a signal at the '°1' level when the second counter reaches a predetermined count value; and 26 is an AND date controller.

In addition, the set value 2 of the count value of the counter 24 mentioned above is scraped when the film reaches the predetermined count.

The value is also slightly larger, which indicates that no jam is occurring due to the drop.

In the above-mentioned film jam detection device, if the film gets caught somewhere in the film path, for example, a slip occurs at the roller 14, causing the film to advance.
! : When it runs out, the minimum roof" detection switch 16 will not operate. Therefore, the count value of the first divider 21 becomes D[
At this time, flip Flora f23 without changing the value of the bar.
9 is left set, and the date of the AND gate circuit 26 is open, so the switch 20 is activated.
When 4 reaches the constant value, the decoder 25 outputs "1"
As a result, a level signal of 1n1n is outputted from the AND gate 26, and the occurrence of a jam can be easily detected.

3 is a waveform diagram illustrating the operation of the device shown in FIG. 2. In FIG. 3, (a) is the output of the flip-flop 23;
(t)) is the output of the decoder 25, (c) is the AND
The output of port 26 is shown.

As in the previous F, the decoder 22 outputs an "o" level signal when the count value of the first b1 counter 21 reaches r9T constant count value 1, and the flip roller 123 is reset at tl. . However, when a film jam occurs, the output waveform of the flip-flop 23 becomes as shown by point 4c. Here, the count value of the second divider 24 is a predetermined count 111! When it reaches i, the decoder 25 outputs a <=SS ratio of 1,000°'1'' level at tl.Therefore, the AND gate output of the flip flora f23 and the decoder 25 is as follows.
The output waveform is shown as a dotted red, and this becomes the jam detection signal.

If the operator is notified of the occurrence of this detection signal and the photographing operation is prohibited in the trench where the initial counter 24 has finished counting a predetermined value at the time of power-on, the operator can be activated before photographing one frame. can notify you of the occurrence of a jam. However, as originally described, when the film in the buffer chamber 9 reaches the minimum loop, the switch 16 is activated.
This switch is provided to prevent the film from being damaged at the pressure plate 3 due to the film in the photographing device being forcibly pulled out by the film drive system on the developing device side. There is no need to adjust the decoder as long as the case conditions are determined, and the switch 20 is originally for counting the amount of film accumulated in the buffer chamber 9, so it is not necessary to make any adjustments. Therefore, the film jam detection device according to the present invention is extremely advantageous in terms of cost.

As mentioned above, the present invention was originally provided to completely prevent damage to the film during the body-forming operation (13). Since it detects a film jam by using a counter installed to count f tt, it is extremely advantageous in terms of cost, and there is no need to use a film sensor near the 5th film passage as in the past. There is no need to provide a barrier, so the film path structure is easy, and a sensor is not required/ζ to provide a highly reliable film jam detection device.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing a microfilm photographing and developing device;
FIG. 2 is a block diagram showing one implementation of the film jam detection device according to the present invention, and FIGS. 3(a), (b), and (c).
2 is a waveform diagram illustrating the operation of the device shown in FIG. 2. FIG. A... Photographing device B... Developing device 1...
Roll of unexposed film 2...Film photography lens 3...Film pressure plate 4...Drive roller 5...
- Pinch roller 6... Guide roller 7... Drive roller 8... Film +s knowledge W (14) 9... Film buffer sensor 10... Film 11... Developing foot landing section 12
...Washing section 13...Drying section 14...,
1. K 9++i roller 15...Film winding unit 16...Minimum loop f phase knowing switch 17...Fully point 18...s 7111 arm roller 19...Cam 20...Micro switch 21...First argument Device 22...Decoder 23...Flip-flop 24...Second counter 25...Decoder 26...
・Andgut

Claims (1)

[Claims] In a device for detecting film jams, which is a JJLY image developing and imaging device that integrates a photographing device and a developing device and develops images while taking pictures, the film loop in the film buffer chamber of the photographing device has become minimal. a first counter that counts the number of times the minimum loop detector is activated; a second one-counter for counting;
A film that is designed to generate a jam signal when the count value of the first counter does not reach the specified value when the count value of the second counter reaches the required value. Jam detection device.