JPS6260B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet material feeding method and apparatus for feeding sheet materials such as microfilms.

In recent years, as the amount of information such as publications and documents has increased, microfilms that record a large amount of information in a reduced form have come into wide use. Such a microfilm is applied to a microfilm system such as a known microfilm reader, reader printer, or microfilm retrieval device, and records information on the microfilm can be projected onto a screen for viewing or printing. I try to use it. There are various types of microfilm such as rolled film and film film, but usually a long roll film is wound around a rotating shaft such as a reel or a cassette, and in a microfilm system using this roll film, After feeding the film from the supply reel and passing the film through the search section or projection section, the film is wound onto the take-up reel or rewound onto the supply reel to search for a desired part (frame) in the film and project it. I try to do that. In such a microfilm system,
If the film becomes jammed in the passage during film feeding, or if the film breaks, it is necessary to detect these feeding defects. Conventionally, in order to detect this feeding failure, a micro switch is placed in the film feeding path, and this micro switch detects the presence of film and determines the film feeding status. Unable to reliably detect defects,
There was a problem in that the film was forcibly fed even though it was jammed, causing problems such as the film being cut. By the way, generally, the terminal end of the film is fixed to the shaft of the supply reel, and when the film wound on the supply reel is completely fed out to the take-up reel, the film on the supply reel runs out and the supply reel and The take-up reel stops rotating and the film is no longer fed, similar to a film jam. Therefore, in either case, the film will not be fed correctly while the film feeding means is being driven (hereinafter, this condition will be referred to as a feeding failure), and if such a feeding failure occurs, the equipment should be It is necessary to prevent breakage, film damage, and cutting, but if the film is jammed, it is necessary to turn off the power to the device and remove the jam, and on the other hand, if the film on the supply reel is completely fed out. In some cases, it may be necessary to rewind the film. Conventionally, when a feeding defect is detected, the film drive is stopped, and the operator then looks into the device and determines the cause of the feeding defect. Based on that judgment, the operator turns off the power or performs a rewind operation. However, when the film is jammed, you accidentally rewind it and damage the film, or when there is no film on the supply reel, you turn off the power switch to clear the jam. There was a problem where unnecessary operations were performed.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, quickly and reliably detect sheet material feeding failures due to sheet material jams, etc., and prevent damage to the sheet material. Furthermore, the present invention distinguishes between cases in which the sheet material is completely fed out from the shaft to which the end of the sheet material is fixed, and cases in which the sheet material is jammed or cut, and takes appropriate measures in response to these cases. The purpose is to make it automatic.

In the present invention, various sheet materials such as microfilter, magnetic tape, 8 mm film, etc. can be used as the sheet material.

The present invention will be explained below using specific examples shown in the drawings.

FIG. 1 shows a microfilm reader to which the feeding device of the present invention is applied.
2 is an illumination lamp, 2 is a condenser lens, and 3 is a field lens, which constitute illumination means, and a specific portion of microfilm F is illuminated by this illumination means. Reference numerals 4 and 5 denote film pressure plates made of transparent glass plates, which are separated from the film while the microfilm is being fed, and come into contact with the film when the film stops to hold the film at a fixed position (focal position) in a flat plane. The film pressing plate is moved by, for example, a known plunger. Reference numeral 6 indicates a projection lens for enlarging and projecting the image of the microfilm, and 7 indicates a screen for observing the enlarged image. 8 is a supply roll for winding the roll microfilm F, 10 is a pinch roller, 11 is a capstan roller for feeding the film, 12 is a film guide roller, and 13 is a take-up reel for winding the film. .
The terminal end of the film wound on the supply reel 8 is removably fixed to the reel's take-up shaft 8a.
The capstan roller 11 is connected to a film feeding motor, which will be described later, and works with the pinch roller 10 to feed the microfilm F in the forward or reverse direction. MS ₁ is a microswitch that detects the presence of microfilm F.

FIG. 2 shows the film drive section of the reader shown in FIG. 1. _M1 is a film feeding motor that rotates in the forward and reverse directions. Axis 11a
When the brake mechanism 15 is off, the capstan roller 11 is rotatable;
When the motor _M1 is driven, the capstan roller 11
rotates, and film F moves from reel 8 to reel 13.
When the brake mechanism 15 is turned on, the brake is activated and the capstan roller 11 is stopped. 16
is the first pulse generator, and the capstan roller 11
generates an electrical pulse signal in response to the rotational movement of the The first pulse generator 16 is composed of a disk 17 fixed to the shaft 11a of the capstan roller 11, a light source 18 consisting of a light emitting diode and a photoelectric conversion element 19, which are arranged opposite to each other with the disk 17 in between. . As shown in FIG. 3, the disc 17 has a number of slits 17' at regular intervals on its circumferential surface, and the motor M ₁
When the disc 17 rotates integrally with the capstan roller, the light source 18 rotates in accordance with the rotation of the disc.
The light rays from the photoelectric conversion element 19 intermittently enter the photoelectric conversion element 19, and the photoelectric conversion element generates a pulse signal.
_M2 is a film tensioning/winding motor connected to the winding shaft 8a of the supply reel 8, and this motor rotates so as to rewind the film onto the winding shaft 8a. 20
is a second pulse generator that generates an electrical pulse signal in response to the rotation of the supply reel 8. The second pulse generator 20 is configured in the same manner as the first pulse generator 16, and includes a disk 21, a light source 22, and a photoelectric conversion element 23. M ₃ is winding reel 13
A film tensioning and winding motor is connected to the winding shaft 13a, and this motor rotates so as to wind the film around the winding shaft 13a. A third pulse generator 25 generates an electrical pulse signal in response to the rotation of the winding reel 13. This third pulse generator 2
5 is configured similarly to the first and second pulse generators,
It is composed of a disk 26, a light source 27, and a photoelectric conversion element 28. The torques of motor _M2 and motor _M3 are set to be equal and smaller than the torque of motor _M1 .

In the above apparatus, when the leading end of the film F is sandwiched between the rollers 10 and 11 and a command is given to start film feeding, the leading end of the film is wound onto the take-up reel by the autoloading mechanism.
When the film is stretched between the reels 8 and 13, the film feeding motor _M1 is deactivated, and the film tensioning and winding motors _M2 and _M3 are activated, the supply reel 8 rewinds and unwinds the film. The upper reel 13 tries to rotate as if winding a film, but
Since the torques of the motors are equal, the film F remains stationary between the reels 8 and 13 with a constant tension maintained without causing any slack in the film.
In this state, when the motor M ₁ is driven in normal rotation, the capstan roller 11 rotates, the film F is pulled out from the supply reel 8, and the glass plates 4 and 5 of the projection section are pulled out.
It passes through the gap and is sent forward toward the winding reel 13. At this time, the winding reel 13 is rotated by the drive of the motor _M3 so as to wind up the film sent by the capstan roller 11. On the other hand, the supply reel 8 rotates as the film is fed. When the motor _M1 is driven in the reverse direction, the film F is pulled out from the take-up reel 13 and sent to the supply reel 8 in the opposite direction. At this time, the supply reel 8 is driven by the motor _M2 to rotate to take up the film, and the take-up reel 13 is driven to rotate in accordance with the film feeding.

Therefore, when the film is normally fed in the forward and reverse directions, the film is fed without sagging, and the first pulse generator 16 generates pulses in response to the rotational movement of the capstan roller. The second pulse generator 20 and the third pulse generator 25 generate pulses in response to the rotational movement of the reel.

Here, for example, let the length of the film be 30m and the thickness.
Assuming 0.125 mm, the circumferential velocity (angular velocity) of each reel's take-up shaft changes depending on the amount of film wound on the take-up shaft, and is approximately 2.5 at the beginning of winding and at the end of one roll of film. Change twice. That is, while the film is being normally fed, the circumferential speed of the take-up shafts 8a, 13a changes by about 2.5 times the circumferential speed of the capstan roller 11. If the length of the film is constant, this change in relative circumferential velocity remains constant regardless of changes in the film feeding speed and feeding direction. Therefore, when the film is normally fed, when the first pulse generator 16 generates a predetermined number of pulses, the second and third pulse generators 20 and 25 generate pulses while the first pulse generator 16 generates a predetermined number of pulses. The number of pulses generated varies within a certain range.

In the above example, the length of the film is 30 m,
The thickness is 0.125 mm, and the first pulse generator 16 is 16
The slit spacing of each disc is set so that fewer than 16 pulses are generated from the second and third pulse generators 20 and 25 during the generation of 16 pulses.
If the film is being fed normally, the first pulse generator 16 generates 16 pulses while the second pulse generator 16 generates 16 pulses.
Minimum of 5 from the third pulse generators 20 and 21, maximum
Assume that pulses are generated in 13 ranges.

Figure 4 shows the control circuit of the above device.
0, 31, 32 are each pulse generator 16, 20, 2
Amplifier that amplifies and shapes the pulse of 5, 35,3
6, 37 are hexadecimal counters, 41, 42, ......
47 is an AND gate, 51, 52, 56 is an inverter, 61, 62, 63 is an OR gate, 7
0 is a mono multivibrator.

Counters 35, 36, and 37 perform counting operations at the rising edge of the input pulse signal, and after counting 15 pulses, output a carry signal from output terminal C until the next input pulse, and reset with the input pulse. It is assumed that the count is reset and the count becomes "0", and when a reset signal is input to the input R, the count is reset and the count becomes "0". Also, when the count contents of the counters 36 and 37 are "3" or less, that is, "0", "1", "2", and "3", the output terminal 4 or 8 of the counters 36 and 37 becomes logic "0". , "4" or more, output terminal 4 or 8 becomes logic "1". When output terminal 4 or 8 is logic “0”, inverters 52, 53, 54, 5
5 becomes logic "1", and when the first AND gate 41 opens in this state, the second and third AND gates 42 and 43 open.

Further, when the motor _M1 is being driven, a signal representing the rotational direction of the motor is output from the AND gates 46 and 4.
When the motor _M1 is rotating in the forward direction, a logic "1" forward direction signal is input to the AND gate 46, and when the motor M1 is rotating in the reverse direction, a logic " ₁ " signal is input to the AND gate 47. 1” reverse direction signal is input. Note that the forward direction signal and reverse direction signal can be obtained by a known method of detecting the rotation direction of the motor.
Omit details.

The operation of the above device will be explained with reference to the time chart of FIG.

It is now assumed that the film F is completely wound around the take-up shaft 8a of the supply reel 8. A command to feed the film in the forward direction drives the motor _M1 at time _t1 in FIG. 5, and the rotation of the capstan roller 11 causes the film F to be fed in the forward direction. In response to the rotational movement of the capstan roller 11, the amplifier 30 generates pulses as shown in the waveform B in FIG. In addition, the supply reel 8 rotates as the film is fed.
In response to this rotational movement, the amplifier 31
Generate waveform pulses. It is assumed that the motors M ₂ and M ₃ are activated when the micro switch MS ₁ detects the presence of a film. The leading edge of the film is fed along a predetermined path by the drive of the motor _M1 and the autoloading mechanism, and when the leading edge of the film reaches the micro switch _MS1 at time _t2 , the micro switch is turned on (the fifth Figure A waveform),
Switches from contact a to contact b. Between times _t1 and _t2 , when the first counter 35 counts 16 pulses, a carry signal is generated from the output terminal C,
This signal opens the AND gate 41 (waveform E in FIG. 5). At this time, the content of the third counter 37 is "0", so the third AND gate 43 is opened, but since the micro switch _MS1 is off (see waveform G in FIG. 5), the output of the inverter 56 is logic "0".
(waveform K in FIG. 5) and the fourth AND gate 44 is closed (waveform L in FIG. 5). On the other hand, when the first AND gate 41 opens, the content of the second counter 36 is "4" or more, so the second AND gate 41 opens.
2 is closed (H waveform in Figure 5). Further, the second counter 36 is reset when the AND gate 45 is opened. When the film is detected at time _t2 and the micro switch _MS1 is turned on, the mono multivibrator 70 is activated and outputs a logic "1" signal as shown in the waveform M in FIG. On the other hand, at time _t2 , motors _M2 and _M3 rotate, and motor _M2 follows the rotational movement of the supply reel 8, but motor _M3 rotates the film F.
The winding reel 13 idles at high speed until it is wound around the winding reel 13, and the amplifier 32 generates a pulse having the waveform D in FIG. Assuming that the film F is wound around the take-up shaft 13a of the take-up reel 13 between times _t4 and _t5 , a carry signal is output from the output C of the third counter 37 between times _t2 and _t4 . However, the third AND gate 43 is opened, but since the mono multivibrator 70 is in operation, the output of the inverter 56 is logic "0", and the fourth AND gate 44 is closed. At time _t5 , the mono-multivibrator 70 becomes inactive, and thereafter, when the microswitch _MS1 is on, the output of the inverter 56 becomes logic "1" as shown in the waveform K of FIG.

Between time _t5 and _t6 , the winding shafts 8a of both reels,
A film is wound around 13b. Therefore, except for the initial state when starting the film (from time _t1 to time _t2 ), when the first counter 35 counts the reference number, that is, 16 pulses, the second and third counters 36, The contents of 37 are “4” and “15”
If it is within the range of , it indicates that the film F is being fed normally, and the OR gate 62 is closed between times _t5 and _t6 (waveform J in FIG. 5).

In other words, if the count values of the second and third counters relative to the reference count value of the first counter 35 are within a predetermined range, the film is being fed normally.

Note that the predetermined counting range (4 to 15) of the second and third counters was made larger than the output pulse number range (5 to 13) of the second and third pulse generators relative to the reference number of the first pulse generator. This is because the number of output pulses fluctuates somewhat due to slips, etc. that occur between the capstan roller and the film during normal film feeding, so the predetermined counting range has been increased to account for these fluctuations (assuming normal film feeding). be.

Next, after time _t6 , if the film is jammed in the feed passage, the rotation of the supply reel and/or take-up reel is restricted, and the rotational speed of the shaft sharply decreases. Hereinafter, for the sake of explanation, it is assumed that the rotational speed of the winding reel 13 decreases. As a result, the interval between pulses generated by the amplifier 32 becomes longer, or no pulses are generated, resulting in a decrease in the number of output pulses. Then, at time t ₇ , the first counter 35
counts the reference number, that is, 16 pulses, and when the first AND gate 41 opens, the third
Since the content of counter 37 is "3" or less,
The third AND gate 43 opens (waveform G in FIG. 5),
The fourth AND gate 44 opens via the OR gate 62 (L waveform in FIG. 5). When the fourth AND gate 44 is opened, the fourth AND gate 44 outputs a feeding failure detection signal. At this time, the motor M ₁ is driving in the forward direction, and a forward direction signal indicating that the motor M ₁ is rotating in the forward direction is input to the fifth AND gate 46. 5 and gate 46 opens. The output of the fifth AND gate 46 is sent to the drive control circuit of the motor _M1 as a reverse command signal for reversing the motor _M1 , and the drive control circuit outputs a stop signal and the motor _M1 is temporarily stopped. . Then motor _M1 is reversed at low speed. At time t ₉ , motor M ₁ reverses and motor M ₁
At the same time, the capstan roller 11 is reversed, and the film F is sent in the reverse direction at a low speed and is rewound onto the supply reel 8. Because of the jam, the take-up reel 13 (or supply reel) hardly rotates, and as described above, the count value of the second or third counter with respect to the reference count value of the first counter 35 becomes "3" or less. , or gate 6
2, the fourth AND gate 44 opens and outputs a feed failure detection signal. At this time, since the backward signal is input to the sixth AND gate 47, the sixth AND gate 47 opens when the fourth AND gate 44 opens. The output signal of the sixth AND gate 47 is sent as a film feed failure detection signal to the drive control circuit of the motors M ₁ , M ₂ , M ₃ and the brake mechanism 15, and each motor is deactivated and the brake mechanism is activated to remove the film. to stop. The OR gate 61 is opened by the signal to stop the film, and the second counters 35, 36, 37 are reset. Therefore, if a defect in film feeding is detected, the film is not forced to be fed, thereby preventing the film from being damaged or cut.

Note that the abnormal state may be displayed on the display using the output signal of the sixth AND gate 47.

The same applies when the film is fed in the opposite direction. If the film jams and the supply reel 8 stops rotating, the second AND gate 42 opens and the sixth AND gate 47 outputs a film feed failure detection signal. Output. If the film breaks during feeding, a carry signal is output from the output terminal C of the second counter 36 or the third counter 37. At this time, since the output of the inverter 56 is "1", the AND gate 44 is activated. Opens and outputs a feed failure detection signal. Therefore, even if the film breaks, the film feeding means automatically stops.

Next, when all the film on the supply reel is fed out and there is no longer any wound film in the supply reel, since the end of the film is fixed to the shaft 8a of the supply reel, both reels 8 and 13 become unrotatable, and the amplifier No pulses are generated from 31 and 32, and the fourth AND gate 44 is opened. Since the motor _M1 is driven to rotate in the forward direction, the opening of the fourth AND gate 44 causes the fifth AND gate 46 to open and output a reverse rotation command signal.
The drive control circuit outputs a stop signal in response to this reverse rotation command signal, and after temporarily stopping motor _M1 , the motor
_M1 is automatically driven in reverse at a low speed, and the film F is rewound onto the supply reel 8 by the reverse rotation of the capstan roller 11. Therefore, in this case, the film is automatically fed backwards, and the fourth AND gate 44 does not output a feeding defect detection signal during this backward feeding, so that it is difficult to distinguish between feeding defects due to film jamming, cutting, etc. It is possible to continue searching for film and reading images without having to perform operations such as turning off the power of the device.

In the present invention, the pulse generator may be coupled to only one of the two reels.

The present invention is also applicable to feeding sheet materials stored in magazines, cassettes, cartridges, etc.

As described above, according to the present invention, if the sheet is jammed or cut, the drive is stopped, if the sheet is fed to the end, the sheet is rewound, and an appropriate action is taken depending on the nature of the feeding failure. Treatment can be performed. As a result, accidents such as damage to the sheet, cutting, damage to the device, etc. can be prevented, and there is no fear of erroneous operation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a microfilm reader to which an embodiment of the present invention is applied, FIG. 2 is a block diagram showing the drive section of the reader, FIG. 3 is a diagram showing the disk of the pulse generator, The figure shows a control circuit, and FIG. 5 shows a time chart. 8, 13... Reel, 11... Capstan roller, 16, 20, 25... Pulse generator.

Claims (1)

[Claims] 1. A sheet wound around a supply shaft is fed to a take-up shaft, a feeding failure of the sheet is detected during feeding, and when the feeding failure is detected, the feeding direction is reversed. A sheet feeding method characterized in that the sheet is driven to feed the sheet from a take-up shaft to a supply shaft, and the driving is stopped when a feeding failure is detected during driving in the opposite direction. 2. A first feeding device that feeds the sheet wound around the supply shaft to the take-up shaft, a second feeding device that feeds the sheet from the take-up shaft to the supply shaft, and a device that detects sheet feeding failure. a control means for stopping the driving of the first feeding means and driving the second feeding means when the detection means detects feeding failure when the first feeding means is driven; A sheet feeding device comprising means for stopping driving of the second feeding means when the detection means detects a feeding failure when the second feeding means is being driven.