JPH0293530A - Roll film carrying device - Google Patents

Abstract

PURPOSE:To rapidly and surely detect that roll film winds around a take-up reel by comparing the carried quantity of the roll film in the fixed rotation of the take-up reel with the carried quantity previously set. CONSTITUTION:The roll film F is inserted between a transmitting guide roller 5 and a supporting guide roller 6 by hand. Thereafter, a transmitting motor 24 and a take-up motor 21 are automatically driven and a jamming timer 29 is started. Since the transmitting guide roller 5 rotates with the movement of the film, the carried quantity of the film F during one rotation of the take-up reel 3 increases and the number of pulses of an encoder B becomes larger than a set value Ps when the film F winds around the take-up reel 3, thereby judging that the film F is taken up to the take-up reel 3. Then, the motor 24 and the take-up motor 21 are stopped and loading is completed. Thus, the winding of the roll film on the take-up reel can be surely and rapidly detected.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a roll film transport device, specifically a roll film that semi-automatically sends out a roll film wound on a storage reel and automatically winds it onto a take-up reel. Regarding film transport devices, for example, it is used as a roll film carrier in league and reader printers to search for predetermined frames on a roll of microfilm and read them on a screen, or to selectively read and copy them. related to things.

(Prior Art) Conventionally, in this type of device, after a storage reel on which a roll film is wound and stored is attached, the roll film is semi-automatically fed out toward a first take-up reel. An encoder roller is usually provided on the roll film transport path, and generates pulses as the roll film is transported. ■The rotation of the take-up reel is started by detecting the start of rotation of this encoder roller, and after a certain period of time has elapsed or a certain number of pulses have been counted, loading (the film is wound onto the take-up reel) ! @The device was stopped after determining that the work was completed. Alternatively, (2) the take-up reel is rotated faster than the film transport speed, and the loading operation is terminated by detecting that the film is wound around the take-up reel and the film travel speed becomes faster.

(Problem to be Solved by the Invention) However, in the above-mentioned case (2), it is only assumed that the leading end of the roll film has been wound around the take-up reel due to the end of the timer or counter, but it is not certain. In some cases, there is an inconvenience that the search operation is started in a loading failure state.

In addition, the timer setting time was set to a fairly long time in consideration of the above-mentioned loading failure, and the image area was sometimes wound up when loading was completed.

In addition, in the case of ■, even though the film is stuck to the take-up reel due to the type of film being loaded or the load on the reel equipment shaft, the speed is not fast enough and winding cannot be detected. There were drawbacks.

The present invention was made in view of the above problems.
It is an object of the present invention to provide a roll film transport device that can reliably and quickly detect winding of a roll film on a take-up reel.

(Means for Solving the Problems) The roll film transport device of the present invention includes a detection means for detecting the transport amount of the roll film with respect to a constant rotation of the take-up reel, and a transport amount detected by the detection means that is set in advance. The detected transport amount is compared with the set transport amount m.
and a means for detecting that the film has been wound onto the take-up reel by detecting that the film has been wound onto the take-up reel.

(Function) Before the roll film is wound around the take-up reel, the take-up reel is rotated so that the moving speed on the core circumference is faster than the film transport speed. By doing this, when the roll film is wound around the take-up reel, the amount of film transport per constant rotation of the take-up reel will be equal to the amount of movement of the take-up reel on the core circumference, and the amount of transport will increase. . Therefore, the winding of the film can be confirmed by detecting the change in the transport amount of the film with respect to a constant rotation of the take-up reel.

Therefore, when examining the change in film transport amount with respect to n rotations of the take-up reel, the film transport speed is vmig, /s
, the rotational speed of the take-up reel is d rlls(revolu
tion per 5 seconds), and if the core diameter of the take-up reel is (see Figure 1), then for each constant rotation n of the take-up reel, set a conveyance amount that is greater than n- and smaller than nπ, This set transport amount is compared with the actual film transport amount for n rotations of the take-up reel, and if the film transport amount is equal to or greater than the set transport amount, it is determined that the film has been wound onto the reel.

Furthermore, if the set transport amount is S, becomes.

(Example) The present invention will be explained below based on the illustrated embodiments.

FIG. 1 shows an embodiment of the present invention, which is applied to a roll film carrier used in a microfilm reader or reader printer. This roll carrier is equipped with a roll film mounting shaft 2 equipped with a feed-out motor (not shown) at the rear, and a winding motor and encoder A (not shown) at the rear, on both sides of a projection position a where the central projection lens 1 is installed. It has a take-up reel 3.

A storage receptacle 4 in which a roll film F (hereinafter referred to as film F) is wound is attached to the roll film device tb2. Between the roll film mounting shaft 2 and the take-up reel 3, a feed-out guide roller 5 for feeding the film whose feed motor is shared with the roll film mounting shaft 2, a support guide roller 6 disposed oppositely with the film F in between, and a guide. Board 7.8
and other guide rollers 9 are provided, and a conveyance path is formed by these. An encoder B that generates pulses as the delivery guide roller 5 rotates is connected to the shaft of the delivery guide roller 5 . At the time of projection, the light @io is transmitted to the mirror 11. The image on the film F passes through the lens 12 and is projected onto the screen 13 via the projection lens l.
Project on top.

FIG. 2 is a block diagram showing the control circuit of this embodiment.
A voltage is applied from a voltage variable device 23 via a transistor 22 to a winding motor 21 that rotates the zero winding reel 3 controlled by U20. This winding motor 2
1 is rotationally driven by turning on the transistor 22, and its rotation speed is variable by changing the applied voltage according to the input signal to the voltage variable device 23. Also,
The delivery motor 24 that rotationally drives the delivery guide roller 5 is
A voltage is applied from a voltage variable device 26 via a transistor 25 . This sending motor 24 has a transistor 25
It is rotated by turning on, and its rotational speed is variable by changing the applied voltage according to the input signal to the voltage variable device 26. On the other hand, the input terminal P of the CPU 20! The encoder B is directly connected to the encoder B, and its pulses are counted by an internal counter 27 and compared with the set conveyance amount S by a comparator 28. Furthermore, the encoder A is directly connected to the input terminal p2.

The CPU 20 counts the pulses of the encoder B during one rotation of the encoder A, and determines that the film has been wound when the amount of film transport detected from the count value becomes greater than the set transport amount S. With the configuration shown in FIG.
The PU 20 is provided with a jam timer 29, which will be described later.

Next, this loading operation will be explained according to the flowchart shown in FIG. First, manually sandwich the film F between the feed guide roller 5 and support guide roller 6 (step ■), and then automatically drive the feed motor 24 and take-up motor 21 (step ■) and start the jam timer 29. (step ■), jam timer 2
9 is set to a time that is sufficient and not too long for the film F to be sent to the take-up reel 3 by the delivery guide roller 5 and wound on the take-up reel, and even after the set time ends, the film F is not wound. If the number of pulses of the delivery guide roller 5 per revolution of the take-up reel 3 does not reach the set value, it is assumed that a jam has occurred between the delivery guide roller 5 and the take-up reel 3, and the jam is cleared (step ①). ■■), -
On the other hand, since the feed guide roller 5 rotates as the film moves, when the film F wraps around the take-up reel 3, the amount of transport of the film F when the take-up reel 3 rotates once increases (
Since the number of pulses of encoder B becomes larger than the set value ps (corresponding to the conveyance amount S), it is determined that film F has been wound onto take-up reel 3. Then, the motor 24 and the take-up motor 21 are stopped to complete the loading (step ■■). In this way, the jam timer 29 is used to detect a jam between the guide roller 5 and the take-up rule 3. However, it is confirmed that the film F has been wound onto the take-up reel 3 by a change in the amount of film conveyance, and the loading is completed.

Although the accommodation reel of this embodiment has been described as one without a cartridge, winding can be detected using the same detection method for the accommodation reel that has entered a cartridge.

(Effects of the Invention) As is clear from the above explanation, the present invention enables the roll film to be wound around the take-up reel by comparing the amount of transport of the roll film for a constant rotation of the take-up reel with the amount of transport set in advance. , loading can be detected more reliably. Moreover, the loading operation can be completed more quickly since extra time is no longer required. In particular, in the conventional method of detecting film winding on the take-up reel only by speed changes of an encoder roller that generates pulses as the film moves, the winding of the film on the take-up reel is Even though the film is wrapped around the film, the speed may not become fast enough, and in this case, it is possible that the winding cannot be detected. Since the amount of conveyance is detected in relation to the rotation of the reel, changes in the amount of conveyance can be detected more reliably, and winding can therefore be detected more reliably.

[Brief explanation of the drawing]

FIG. 1 is a front view of a schematic configuration of a film conveying device showing one embodiment of the present invention, FIG. 2 is a block diagram showing a control circuit in the same embodiment, and FIG. 3 is a flowchart showing the control operation of the same embodiment. It is. Explanation of symbols! ...Projection lens 2...Reel mounting shaft 3.
...Take-up reel 4...Accommodation reel 5...Feeding guide roller 6 for feeding the film...Support guide roller 7.8...Guide plate 9...Guide roller lO
. . . Light source 11 . . Mirror 12 . . . Lens 2o . . CPU 21 . . . Winding motor 24 . Voltage variable device 27... Counter 28... Comparator A, B...
Encoder F◆...Roll film Figure 1 Figure 3 Figure 2 cc

Claims (2)

[Claims] (1) In a roll film conveyance device that semi-automatically sends out a roll film wound around a storage reel and automatically winds it onto a take-up reel, a detection means for detecting the conveyance amount of the roll film with respect to a constant rotation of the take-up reel. The amount of conveyance detected by the detection means is compared with a preset amount of conveyance, and when the detected amount of conveyance exceeds the set amount of conveyance, it is detected that the film has been wound onto a take-up reel. A roll film conveying device characterized by having means. (2) The detection means includes a roller that rotates as the film moves, an encoder that generates pulses as the roller rotates, and an encoder that generates pulses as the take-up reel rotates. The roll film transport device according to claim 1, characterized in that: