JPH0464986B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet material feeding device that automatically winds up a long film-like seed material wound around a rotating body onto another rotating body, and particularly relates to a sheet material feeding device that automatically winds up a long film-like seed material wound around a rotating body, and particularly when the feeding ends. The present invention relates to a sheet material feeding device having a time control device.

Conventional sheet material feeding devices that wind long sheet materials around a rotating body such as a reel and feed the same, fix the final end of the sheet material to the winding core of the reel, etc., and transport the sheet material at high speed to the final end. When the sheet material was fed, the feeding was mechanically and forcibly stopped at the final end of the sheet material, so the sheet material could be cut or the reel or other material may come off the core at the final end of the sheet material. ,
There are many cases where all the sheet material gets wound up on the reel on the take-up side, and when rewinding, one end of the sheet material must be fixed to the core of the reel on the supply side again, or the sheet materials must be reconnected to each other. It was definitely a hassle.

In order to avoid the above-mentioned problems, a signal generating means such as an end mark and a detecting means such as a micro switch are provided at the final end of the sheet material, and when this detecting means detects the end mark of the sheet material, the feeding of the sheet material is stopped. I was trying to stop it.

However, this method requires processing such as attaching an end mark to the sheet material, and considering the time required from detecting the end mark to stopping the sheet material, it is necessary to add the end mark well before the final end of the trailer. It was necessary to take a long time. Further, the end mark is often detected by contacting the sheet material using mechanical means such as a micro switch, and in this case, the sheet material is likely to be damaged.

The present invention has been made in view of the above points and to eliminate the above drawbacks.The present invention does not require any processing on any sheet material and is a sheet material that is output from a pulse generator that does not contact the sheet material. To provide a sheet material feeding device which detects the end of feeding of a sheet material based on a rotation signal from a rotating body around which a sheet material is wound, and switches the feeding of the sheet material to a low speed or stops based on this detection signal. The purpose is to

In the present invention, various sheet materials such as micro film, magnetic tape, and 8 mm film 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. In the figure, 1 is an illumination lamp, and 2 is a condenser lens. An image portion recorded on a microfilm F (hereinafter also referred to as film F), which is an example of the material, is illuminated. Film guide plates 4 and 5 are made of transparent glass plates, and are separated from the film movement path while the microfilm is being fed, and when the film stops, are brought close to the film movement path to hold the film at a fixed position (focal position) and flatten it. Hold. The film guide plate is moved by, for example, a known solenoid. 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 reel for winding the roll microfilm F; 10,1
Reference numeral 1 indicates a film guide roller, and reference numeral 13 indicates a take-up reel for winding up the film.

FIG. 2 shows the film drive unit of the reader shown in FIG. 1. M ₁ and M ₂ are film feeding motors that rotate in a fixed direction, and the motor M ₁ is connected to the rotating shaft 8a of the supply reel 8. The motor _M2 is connected to the rotating shaft 13a of the take-up reel 13, and by selectively driving one of the motors, the film F is moved from the reel 8 to the reel 13 side or from the reel 13 to the reel 8 side. When the motor is turned off, a brake mechanism (not shown) is activated to stop the rotation of the rotating shaft, and the film F is stopped. Each reel can be attached to and removed from the rotating shaft, and rotates integrally with the rotating shaft. 16 is the first pulse generator, and the rotating shaft 8
An electrical pulse signal is generated in response to the rotational movement of a. The first pulse generator 16 is composed of a disk 17 fixed to the rotating shaft 8a, 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. Disk 17 is the third
As shown in the figure, the circumferential surface has a large number of slits 17' at regular intervals, and the rotating shaft 8 is driven by the motor _M1.
When the disk 17 rotates integrally with the disk a, the light beam from the light source 18 intermittently enters the photoelectric conversion element 19 in accordance with the rotation of the disk, and the photoelectric conversion element 19 generates a pulse signal. The motor _M1 rotates to wind the film onto a supply reel 8 attached to a rotating shaft 8a. 20 is a second pulse generator, and the rotating shaft 13
An electrical pulse signal is generated in response to the rotation of a. This second pulse generator 20 is constructed in the same manner as the first pulse generator 16 in FIG. 3, and is comprised of a disk 21, a light source 22, and a photoelectric conversion element 23. The motor _M2 rotates to wind the film onto a take-up reel 13 attached to a rotating shaft 13a.

Figure 4 is a simplified diagram showing the relationship between the microfilm as a sheet material and the reel as a rotating body at the start of sheet material feeding, and Figure 5 is a simplified diagram showing the relationship between the microfilm as a sheet material and a reel as a rotating body at the time of sheet material feeding. FIG. 2 is a simplified diagram showing the relationship between a microfilm and a reel as a rotating body. 4 and 5, 8' is the core of the supply reel 8 of FIG. 1 for supplying the film F. 13' is also the core of the take-up reel 13 shown in FIG. 1 for winding the film F. 1
0 and 11 are the entire film guide rollers.

FIG. 6 is a block diagram of an embodiment of a control device for a sheet material feeding device according to the present invention. 16,20
are the first and second pulse generators explained in FIGS. 2 and 3, and the pulse signals from these are sent to the first operational amplifier 3 via amplifiers 31 and 32, respectively.
given to 4. The first calculator 34 receives a signal from the start signal generating circuit 33 for starting sheet material feeding, and successively calculates and outputs the ratio of the number of pulses for a certain period of time from both pulse generators 16 and 20. 35 is a second computing unit which inputs the signal of the ratio of the number of pulses at the start of sheet material feeding from the first computing unit 34, performs predictive calculation together with other fixed values, and calculates the signal at the end of sheet material feeding. This is to output the ratio of the number of pulses. Reference numeral 37 denotes a comparator, which inputs the signal of the ratio of the number of pulses calculated by the second calculator 35 as a comparison reference signal via the memory 36, and sequentially calculates and outputs the pulses by the first calculator 34. This is for comparison with the signal of the ratio of numbers. Reference numeral 38 denotes a motor control circuit, which receives a feeding end signal from the comparator 37 at the end of sheet material feeding and drives a motor for feeding the microfilm (in FIG. 2, the film F is moved from the supply reel 8 to the take-up reel 13). This is for outputting a control signal to the motor drive circuit 39 to slow down or stop the motor M 2 ) when the motor is being fed to the motor M ₂ ).

Hereinafter, the operation of the sheet material feeding device will be explained with reference to FIGS. 1 to 6. The state before the start of feeding the sheet material is as shown in FIG. 4, in which the winding diameter of the film F is D ₁ with respect to the winding core 8' of the diameter D ₀ of the supply reel 8 on the supply side of the film F. F is wrapped. Winding core 1 with a diameter d ₀ of the winding reel 13 on the winding side
3', the film F is wound several times, and the winding diameter is approximately equal to _d0 . From this state, the motor
M ₂ is rotated, the take-up reel 13 is rotated via the rotating shaft 13a, and the film F is pulled out from the supply reel 8 and wound onto the take-up reel 13. At the time of starting the supply of the film F, the rotating shafts 8a and 13
Since the disks 17 and 21 rotate together with a, pulse signals proportional to their rotational speeds are transmitted to the light source 18 and the photoelectric conversion element 19, and to the light source 22 and the photoelectric conversion element 23.
Output via . With this, the number of pulses per unit time output from the first pulse generator 16 at the time of starting sheet material feeding is set as P ₁ , and the number of pulses per unit time output from the second pulse generator 20. When Q ₁ is defined as Q ₁ , the relationship between the number _of pulses and the winding diameter is _{D 1} /d ₀ = _{Q 1 /} P ₁ . Here, if Q ₁ /P ₁ = n ₀ , then D ₁ = n ₀ d ₀ (1).

As the film F further advances, as shown in Fig. 5, near the final end of the film F, that is, the diameter D ₀ of the winding core 8' on the supply side, the winding diameter becomes D ₀ + ΔD (ΔD is a small value). When the film is used up, the winding diameter of the film F on the winding reel 13 on the winding side is _d1 . At the end of feeding the film F, on the supply side, the first pulse generator 16 generates P ₂ pulses per unit time, and on the winding side, the second pulse generator 20 generates Q ₂ pulses per unit time. Several pulses are generated. At this time, the relationship between the number of pulses and the winding diameter is D ₀ + ΔD/d ₁ = Q ₂ /P ₂ is d ₁ = P ₂ /Q ₂ (D ₀ + ΔD)...(2
), and if we set P ₂ /Q ₂ =1/n ₁ here, equation (2) becomes d ₁ =(D ₀ +ΔD)/n ₁ ...(3).

Since the amount of winding on the cores 8' and 13' of film F in FIG. 4 is equal to the amount of winding on cores 8' and 13' of film F in FIG. 5, π/4(D ₁ ² −D ₀ ² )=π/4(d ₁ ² −d ₀ ² )+π/4 [
(D ₀ + ΔD) ² −D ₀ ² ]...(4). Here, since ΔD ² ≒ 0, equation (4) is D ₁ ² −D ₀ ² )=d ₁ ² −d ₀ ² +2ΔD・D _{0Substituting} equations (1) and (3) into the above equation, Calculating n ₁ becomes. Here, d ₀ and D ₀ are values known in advance, and if ΔD is set to the winding thickness around the core 8' at the end of feeding of the film F, then the feeding of the film F can be started. From the ratio n ₀ of the number of pulses at the time of feeding, the ratio n ₁ of the number of pulses at the end of feeding of the film F is predicted and calculated using equation (5), and the magnitude of the signal of this n ₁ and the ratio n 1 of the number of pulses at the end of feeding of the film F are calculated. The signal is compared to the ratio of the number of pulses per unit time, and when the two signals match, the film F
It is possible to detect the end point of feeding.

In FIG. 6, etc., the diameter D _{0 of the winding core 8' of the supply reel 8 on the supply side of the film F, the diameter d 0 of} the winding core of the winding reel 13 on the winding side of the film F, and the feed of the film F are shown. The set winding thickness ΔD of the film F around the winding core 8' at the end of feeding is stored in advance in the second computing unit 35. Next, the motor _M2 rotates in response to a sheet material feeding command from an operator (not shown), and at the same time, as mentioned above, the winding core 8' of the supply reel 8 and the winding core 13' of the take-up reel 13 are The film F is fed from the supply reel 8 to the take-up reel 13 by rotating in the direction shown in the figure.

At the time of starting this sheet material feeding, the first computing unit receives a start signal from the start signal generation circuit 33, and receives the start signal from the first pulse generator 16 and the second pulse generator 20 via the respective amplifiers 31 and 32. Count the number of pulses per unit time, calculate the ratio n ₀ of both counted pulse numbers,
This signal is output to the second arithmetic unit 35. The second computing unit performs predictive calculation according to equation (5) from the signal of this pulse number ratio n ₀ and the pre-input signals of D ₀ and ΔD, and at the end of feeding of the film F. The ratio n ₁ of the number of pulses per unit time of the pulse signals from both pulse generators 16 and 20 is given to the memory 36 as a prediction calculation result, and this signal is stored in the memory 36. When feeding the sheet material, pulse signals output from the first pulse generator 16 and the second pulse generator 20 are input to the first computing unit 34 via amplifiers 31 and 32, respectively. 34
The second pulse generator 2 for the number of pulses per unit time generated by the first pulse generator 16
0, the ratio of the number of pulses generated per unit time is calculated, and the result of this calculation is sequentially output to the comparator 37. The comparator 37 compares this input signal with a reference signal of a ratio n ₁ of the number of pulses at the end of feeding which is predicted and calculated input into the memory 36, and when both input signals match, the comparator 37 outputs a film F feeding end signal. The state of the amount of winding of the film F around the winding cores 8', 13' at the end of this sheet material feeding is the state shown in FIG. The motor control circuit 38 inputting this feeding end signal controls the motor drive circuit 39 to start the motor.
Slow down or stop M ₂ . motor
When M ₂ is set to a low speed, the operator (not shown) can turn off the power switch (not shown) of the motor M ₂ when the speed is low, or alternatively, the motor M 2 can be left in the same state as before and the supply side The film F is wound around the winding core 13' on the winding side until the winding core 8' is exposed to the outside and then stopped. At this time, since the motor _M2 has a low speed, it stops without the film F being cut or coming off the core as in the conventional case.

Although the pulse generator generates pulses using an optical method, it may also generate pulses using a magnetic or mechanical method. In addition, in this embodiment, the supply side of the film was used as a supply reel, and the take-up side was used as a take-up reel, but the supply side of the film as a sheet material during rewinding was used as a take-up reel, and the take-up side was used as a supply reel. Even in the case of a reel, by performing the same configuration and operation as described above, it is possible to feed the film as a sheet material so as not to cut it or to prevent it from coming off the core. can.

Also, although the start signal from the start signal generation circuit was not discussed in detail in this embodiment,
This is done by sending out one pulse from the one-shot multivibrator via a delay circuit in response to an operator's command to start feeding the sheet material.

As explained above, the ratio of the pulse signal at the end of feeding of the sheet material is predicted from the ratio of the rotation pulse signal at the start of feeding, and when this matches, the feeding of the sheet material is stopped or the speed is reduced to a relatively low speed. By doing so, it is possible to prevent the sheet material whose final end is fixed from being cut or coming off from the winding core. Furthermore, this detection method has made it possible to feed various sheet materials without requiring any special processing.

[Brief explanation of the drawing]

1 and 2 are block diagrams of a sheet material feeding device according to the present invention, and FIG. 3 is a partial diagram of a pulse generator.
4 and 5 are simplified diagrams showing changes due to sheet material feeding, and FIG. 6 is a block diagram for generating a sheet material feeding end signal according to the main part of the present invention. 8... Supply reel (as a rotating body), 13...
...Take-up reel (as a rotating body), 16...1st
Pulse generator, 20...Second pulse generator, 33
...Start signal generation circuit, 34...First arithmetic unit, 35...Second arithmetic unit, 36...Memory unit, 37
... Comparator, 38 ... Motor control circuit, 39 ...
Motor drive circuit, M ₁ , M ₂ ... motor.

Claims (1)

[Claims] 1. In a sheet material feeding device that automatically feeds and winds a long sheet material wound around one rotating body to the other rotating body, on the supply side and the winding side. first and second pulse generators that output pulses proportional to the rotational speed of the rotating body; first calculation means that calculates the ratio of the number of pulses generated from the first and second pulse generators per unit time;
a second calculation means for calculating the ratio of the number of pulses at the end of feeding near the end of the sheet material based on the ratio of the number of pulses at the start of feeding of the sheet material calculated by the first calculation means; a comparison means for comparing the ratio of the number of pulses calculated by the second calculation means and the ratio of the number of pulses calculated successively by the first calculation means; What is claimed is: 1. A sheet material feeding device comprising: drive control means for controlling.