JPH01197730A - Roll film carrier - Google Patents

Abstract

PURPOSE:To accomplish operations according to the way that the carrier is used while transparent glass plates are opened and closed by providing a RAM which stores a set reference value and arbitrarily changing a reference value which regulates the timing of opening the transparent glass plates. CONSTITUTION:The transparent glass plates 15 and 17 are disposed between reels 3 and 5 for winding and rewinding a film 1. An encoder 27 placed upstream the glass plates 15 and 17 detects the feeding speed of the film 1 from the rotation of a roller 23, and generates pulse signals in response to the detected speed. The generated signals are inputted to a controller and the feeding speed of the film 1 is calculated from a pulse interval. When the speed exceeds the reference value stored in the RAM which is incorporated in the controller, a pressure plate solenoid 21 is turned on, the glass plates 15 and 17 are opened, and the damage of the tape 1 can be prevented. In the opening and closing control, the feeding speed of the film 1 can be set at what an operator wants by changing the reference value, and the control according to the way that the carrier is used can be accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a roll film carrier in which the opening and closing of a pair of transparent glass plates on which a film is sandwiched and pressure-bonded is controlled by the feed speed of the film.

<Prior art> Long microfilms are often wound into rolls (roll films) for convenience in handling, and such roll films are rolled by roll film carriers in readers, reader printers, etc. A rewind operation is performed.

In other words, in a roll film carrier, the microfilm wound on a reel is wound from one end onto another take-up reel, and the film being fed between these reels is transported between a pair of transparent glass plates located in the projection optical path. Pincer,
The image information recorded on this film is projected onto a screen or the like.

During projection, the film is sandwiched between a pair of transparent glass plates in the projection optical path in order to determine the positional relationship between the film and the projection lens and obtain a focused and clear projected image. Its position is defined.

If you are searching by feeding the film frame by frame intermittently, or if you are searching by scanning the film by feeding it at a relatively low speed (low-speed scanning), you can leave the film between the transparent glass plates. There is no problem even if the image is sent, and the advantage is that it is easier to search because of the clear projected image.

However, when the film is advanced at a relatively high speed and searched by scanning (high-speed scanning) or when the film is advanced at a fairly high speed, such as when simply rewinding, it is necessary to avoid damaging the film. It is necessary to open the pair of transparent glass plates so that the film being fed is not sandwiched between the transparent glass plates.

For this reason, roll film carriers are equipped with a mechanism that opens and closes the transparent glass plate by manual lever operation, and roll film carriers equipped with a mechanism that automatically opens the transparent glass plate when the feed speed exceeds a certain speed set in advance at the time of device design. Film carriers are known.

<Problems to be Solved by the Invention> Even with roll film carriers equipped with an opening/closing mechanism for a pair of transparent glass plates that sandwich a film, conventional roll film carriers have had the following problems.

That is, in the case where the transparent glass plate is manually opened and closed, the operation is troublesome, and when the film is fed at high speed, there is a risk that the transparent glass plate may be forgotten to be opened and the film may be damaged.

Additionally, devices that open the transparent glass plate automatically based on a speed preset during device design are not easy to use because they cannot control the opening and closing of the transparent glass plate depending on the strength of the film or the operator's preference. There were some very bad cases.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a roll film carrier that rationally solves the above-mentioned problems.

<Means for Solving the Problems> The roll film carrier of the present invention that achieves the above object comprises a pair of transparent glasses, each of which is driven to wind and unwind a film wound into a roll, and arrange the film in a projection section. A roll film carrier comprising a feeding means for feeding through between plates and an opening/closing means for opening and closing the pair of transparent glass plates, a detection means for detecting the feeding speed of the film, and a detection feeding speed from the detection means. and a reference value, and if the detected speed exceeds the reference value, opening/closing control means holds the pair of transparent glass plates in an open state separated from each other, and reference value setting means can arbitrarily change the reference value. It is characterized by having the following.

Function> When the feeding speed of the film passing through the projection section exceeds a reference value, a pair of transparent glass plates sandwiching the film are opened to prevent damage to the film.

By changing the reference value that defines when the transparent glass plate is released, the operator can adjust the film feed speed at which the clamp is released to suit the operator's wishes, making it possible to perform operations according to various usage conditions. Realized.

<Example> The roll film carrier of the present invention will be specifically described based on Examples.

A roll film carrier according to an embodiment of the present invention is of a type in which microfilm is fed by manually rotating a reel, and is equipped with a mechanism as shown in FIG. A pair of reels 3 and δ are provided for winding and unwinding the microfilm 10, and handles 11.13 are attached to rotatable shafts 7.9 on which these reels 3.5 are respectively fitted. A pair of transparent glass plates 15.17 are disposed between these reels 3.5, and the film l fed between the reels 3.5 is transported between these glass plates 15.1.
It passes through 7 spaces. These glass plates 15.17 are provided with a roll film carrier or are located in the projection optical path of a double link, etc., and the image information recorded on the film 1 is transmitted to the projection section where the glass plates 16.17 are located. and projected onto a screen, etc.

One glass plate 15 is fixed to the base of the roll film carrier, and by pressing the film 1 against this fixed glass plate 15, the distance between the film surface and the projection lens is kept constant and a focused image is projected onto the screen. It is now possible to project onto.

The other glass plate 17 is attached to a holder 19 that is swingably provided on the base of the roll film carrier, and when the holder 19 swings, this movable glass plate 1
7 approaches and separates from the fixed glass plate 15. Holder 1
9 is always biased toward the fixed glass plate 15 by a spring or the like, and normally the movable glass plate 17 is pushed toward the fixed glass plate 15.
It is designed to be pressed against. Further, a pressure plate solenoid 21 is connected to the holder 19, and when the solenoid 21 is actuated by a signal from a control device to be described later, the holder 19 is swung against the spring or the like, and the movable glass plate 1 is
7 is separated from the fixed glass plate 15.

A pair of feed rollers 23.25 are provided on the upstream and downstream sides of the transparent glass plate 16.17, respectively, and the film 1, which is fed between the reels 3.5 by these rollers 23.25, is transferred to the glass plate. You will be guided to pass between 15 and 17.

An encoder 27 is attached to the roller 23, and the encoder 27 detects the feed speed of the film 1 from the rotation of the roller 23 and generates a pulse signal at a corresponding period.

This roll film carrier is equipped with a control device as shown in FIG. In other words, an ultra-small arithmetic element (
It includes a CPU 31 (hereinafter referred to as a CPU), a read-only memory (hereinafter referred to as a ROM) 33, and a memory that can be read and written at any time (hereinafter referred to as a RAM) 35. A pulse signal is input to the CPU 31 from the encoder 27 via an input/output circuit (hereinafter referred to as Ilo) 37. Further, a control signal is output from the CPU 31 to a drive circuit 39 that operates the solenoid 21 via r1037.

This control device also controls or communicates with a reader printer or the like equipped with a roll film carrier, and its operation control is performed in connection with the main body of a beam-dublinder, etc., which will be described later. Therefore, when the control device also controls a reader printer, etc., the ROM 33 and RAM 35 store information such as the projection magnification range necessary for the operation of the reader printer, and the RAM 35 also stores information such as the projection magnification range required for the operation of the reader printer. Glass plate 15.
Reference values for performing opening/closing control of No. 17 are stored in a rewritable memory.

The operation of the roll film carrier controlled by the control H position will be explained based on the flowcharts shown in FIGS. 3 and 4.

The speed detection routine shown in FIG.
The encoder 27 detects the feeding speed of the film 1 conveyed by the operation of the film feeding means (film feeding means), and the opening/closing of the movable glass plate 17 is controlled based on the feeding speed of the film 1. That is, first, the pulse interval of the pulse signal input from the encoder 27 to the control device is measured (step Sl), and the feed speed of the film 1 is calculated from this pulse interval based on the calculation table stored in the ROM 33. (Step S2). Then, the calculated feed speed is set to a set speed (reference value: e.g. 40 mm/sec) stored in advance in the RAM 35.
(below) (step S3). As a result, if the calculated feeding speed is lower than the set speed (reference value), the feeding speed is relatively slow and there is no risk of damage to the film l, so the pressure plate solenoid 21 is turned off (step S4). The glass plates 15 and 17 are in a closed state. Therefore, a projected image that is accurately focused can be obtained during low-speed continuous reading or the like. On the other hand, if the calculated feeding speed exceeds the set speed (reference value), the pressure plate solenoid 21 is turned ON to prevent damage to the film l (step S5), and the glass plate 15.17 is in the state asked. shall be. Therefore, when the feeding speed increases to such an extent that damage to the film 1 is at risk during high-speed scanning, etc., the pinching pressure on the film 1 by the glass plates 15 and 17 is automatically released, and the speed setting routine shown in FIG. This is for changing the reference value when controlling the opening and closing of the plates 15 and 17. That is, turn on the reference speed setting switch on the operation panel (not shown) attached to the roll film carrier.
The setting speed (reference value) stored in the RAi'v 135 can be changed (step 511).
). Next, operate the numeric keypad on the operation panel (not shown) to set the set speed (reference value) to a value of your preference (however, within a range that can prevent damage to the film, for example, 50 mm/sec or less) ) manually (step 512). Next, the above operation panel (not shown)
Turn on the memory switch (step 513), and rewrite the numerical value entered manually using the numeric keypad into the RAM 35 as the set speed (reference value) (step 514). Therefore, from now on, the speed detection routine will be executed based on this set speed (reference value), and the opening and closing of the glass plates 15 and 17 can be controlled according to the difference in film strength and the operator's preference.

Steps Sl and S2 executed by the encoder 27 and the CPU 31 constitute a detection means for detecting the film feeding speed, and the solenoid 21, the drive circuit 39 and the CPU 3
Steps S3 to S5 executed in step 1 are performed on the glass plate 15.1.
An operation panel (not shown) that constitutes an opening/closing control means for controlling opening/closing of 7 and is attached to the roll film carrier.
Step S executed by the various switches and the CPU 31
11 to S14 constitute a reference value setting means for changing the reference value for glass plate opening/closing control.

Furthermore, after executing the routine shown in Figures 3 and 4,
Return to the control routine of the reader printer main body.

FIG. 6 shows a control device according to another embodiment that achieves control of the pressure plate solenoid 21 without using the CPU.

In this embodiment, the pulse signal from the encoder 27 is
The V converter 41 is manually powered to obtain a voltage corresponding to the film feed speed from the pulse frequency.

Then, the voltage obtained by the FV converter 41 is manually applied to a comparator 49 (opening/closing control means) whose reference voltage is set by a fixed resistor 43.45 and a variable resistor 47, and the two types of pressures are compared. As a result, when the voltage obtained by the FV converter 41 is higher than the reference voltage, the feeding speed of the film 1 is high and damage to the film is at risk, so a signal is output to the solenoid drive circuit 39 to operate the pressure plate solenoid 21, The clamping pressure applied to the glass plates 15 and 17 of No. 1 is released. On the other hand, when the voltage obtained by the FV converter 41 is lower than the reference voltage, the feeding speed of the film 1 is not so high as to risk damage, so the pressure plate solenoid 21 is deactivated and the film 1 is sandwiched between the glass plates 15 and 17. Priority is given to the focus of the projected image in the pressed state.

By operating the variable resistor 47 constituting the reference value setting means and changing the reference voltage set to the comparator 49, the reference value for the opening/closing control of the glass plate 15, 17 can be arbitrarily set.

Therefore, similarly to the above embodiment, while opening and closing of the glass plates 15 and 17 can be achieved automatically, the variable resistor 47 can be controlled by the operator.
The opening and closing of the glass plates 15 and 17 can be controlled according to the difference in film strength and the operator's preference.

The present invention is not limited to the above-mentioned embodiments, but can be modified in various ways based on publicly known techniques. Further, the present invention can be applied to a roll film carrier that automatically feeds the film by driving a motor or the like.

<Effects> According to the roll film carrier of the present invention, when opening the transparent glass plate based on the film feeding speed,
By making it possible to arbitrarily change the reference value that defines the opening timing, it is possible to open and close the transparent glass plate automatically, but also to control the opening and closing of the transparent glass plate according to differences in film strength and operator preference. This greatly improves the usability of the device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a roll film carrier according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a control device, FIG. 3 is a flowchart of a speed detection routine, FIG. 4 is a flowchart of a speed setting routine, and FIG. FIG. 5 is a configuration diagram of a control device according to another embodiment of the present invention. 1...φ microfilm, 11, 13...handle, 15.17...transparent glass plate, 21...pressure plate solenoid, 27...encoder, 31...CPU. 47...Variable resistor, 49...Comparator. Patent applicant Minolta Camera Co., Ltd. Agent
Patent Attorney Kiyoshi Kuwai - (1 other person) Figure 7 Figure 51 Figure 4 Figure 5

Claims (1)

[Claims] A feeding means for winding and rewinding a film wound into a roll to transport the film through a pair of transparent glass plates disposed in a projection section, and an opening/closing means for opening and closing the pair of transparent glass plates. A roll film carrier equipped with a detection means for detecting the film feeding speed, and comparing the detected feeding speed from the detection means with a reference value, and when the detected speed exceeds the reference value, the pair of transparent glass A roll film carrier comprising: opening/closing control means for holding the plates in an open state separated from each other; and reference value setting means for arbitrarily changing the reference value.