JPH03120525A - Microfilm retrieving device - Google Patents

Abstract

PURPOSE:To uniformly tighten the take-up of a microfilm and to prevent the film from being damaged by providing a take-up diameter detecting sensor on a supplying side reel and controlling the torque of a supplying reel motor according to the changing quantity of a take-up diameter. CONSTITUTION:The microfilm 14 in a cartridge 18 is taken up to a take-up reel 22 by a carrying belt 52 driven by a take-up motor 62. The take-up diameter detecting sensor 63 is disposed in the vicinity of the supplying side reel 34 and an actuator 67 abuts on the outer periphery of the film.The take-up diameter detecting sensor 63 measures the take-up diameter of the supplying side reel 34 attending on the carrying of the film 14 and the torque control means 36 of a controller 38 changes the torque of the supplying motor 40 of the supplying side reel 34 by a prescribed formula. Thus, the film 14 is prevented from being pressure and taken up in bellow-shape, and being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION C. Industrial Application Field The present invention relates to a microfilm retrieval device that searches for image frames based on a designated address while transporting a long microfilm.

[Prior art]

Generally, the long microfilm is wound up in layers and stored on a supply reel within a cartridge. The cartridge can then be loaded into the League Printer, which is a microfilm retrieval device. When the cartridge is loaded, the League Printer's autoloading mechanism operates to load the last microfilm wound onto the take-up reel. The upper layer is pulled out and wound onto a take-up reel inside the league printer.

The optical axis position for projecting the image recorded on the microfilm is between the take-up reel and the supply reel.

Blip marks are attached to the microfilm near the image frames corresponding to each of the plurality of image frames recorded on the microfilm. Blip marks are attached to both ends of the microfilm in the width direction, and mark detection sensors are installed corresponding to the positions of both ends to detect the blip marks while transporting the microfilm. .

Here, the operator can specify the mark count and the like by inputting a predetermined numerical value from the keyboard. When the mark count number is specified, the microfilm is wound from the supply reel to the take-up reel or from the take-up reel to the supply reel, and the blip marks are sequentially counted as it is transported. Image frames can be searched.

In the league printer, the retrieved image frame is positioned at the optical axis position for projection onto the screen, and is enlarged and projected. Furthermore, the projected image can be copied if necessary.

Here, in conventional reader printers, the microfilm is transported by rotating the take-up reel in forward and reverse directions while applying a constant, weak torque to the supply reel to constantly rotate the microfilm in the winding direction. That's what I do. Therefore, tension is generated in the microfilm, and the microfilm can be transported without slack.

[Problem to be solved by the invention]

However, the diameter of the microfilm wound on the supply reel becomes smaller as the amount of the microfilm wound on the take-up reel increases. Therefore, the tension of the microfilm fully wound on the supply reel is smaller than the tension of the microfilm fully wound on the take-up reel. For this reason, when the microfilm is wound onto the take-up reel, it is loosely wound at first and then gradually wound tightly, causing the microfilm being wound inside to be compressed into a bellows-like shape and damaged. There is a problem.

In addition, as the film accelerates and decelerates, inertia torque is generated due to the moment of inertia of the supply reel, and the tension fluctuates, and when the film feeding direction is switched, the direction of the friction torque on the supply reel changes, causing the tension to fluctuate. There is also the problem that the microfilm is compressed in a bellows-like manner and damaged due to the fluctuation.

In consideration of the above-mentioned facts, the present invention aims to provide a microfilm retrieval device that can properly wind up microfilm and prevent damage to the microfilm.

[Means to solve the problem]

The microfilm retrieval device according to the present invention includes a supply reel for winding a long microfilm in layers, a take-up reel for winding the microfilm pulled out from the supply reel in layers, and the take-up reel. a main drive means for transporting the microfilm by rotating the supply reel in the microfilm winding direction; a sub-drive means for rotating the supply reel in the microfilm winding direction; and a main drive means for rotating the supply reel in the microfilm winding direction; a winding diameter measuring means for measuring the winding diameter of the microfilm being wound onto the supply reel; A microfilm retrieval device that searches for a search target image frame in a state where The apparatus includes a torque control means for controlling the torque of the auxiliary drive means so that the tension becomes constant according to the degree of acceleration/deceleration of the supply reel obtained from the amount of change and the friction torque.

[Function] According to the present invention, the winding diameter of the supply reel is measured by the winding diameter measuring means as the microfilm is transported. Depending on the measured winding diameter, the torque control means changes the torque of the auxiliary drive means so that the tension of the microfilm conveyed when the microfilm is wound onto the take-up reel is constant.

In other words, the winding diameter is r1, the tension is Te,) the torque is T1, the microfilm transport speed is v1, the moment of inertia is J(r
) and friction torque as TF, these have the relationship shown by the following equation.

... (1) It is the degree of acceleration/deceleration during transportation and feeding, and is hereinafter referred to as the degree of acceleration/deceleration K.

Therefore, 1 friction torque TF for the acceleration/deceleration degree of the winding diameter r1
By changing the torque T in accordance with the change in the tension Te, the tension Te can always be kept constant. This makes it possible to uniformly tighten the microfilm onto the take-up reel.

〔Example〕

FIG. 1 shows a reader printer 10 according to this embodiment. In this league printer 10, a screen 16 for projecting an image recorded on a microfilm 14 is arranged on the front surface of the casing 12 (right side in FIG. 1). The microfilm 18 is loaded into a loading section 20 provided slightly below the screen 16, and the tip of the microfilm 14 inside the cartridge 18 is placed in a take-up reel 22 (take-up reel) inside the device. It is wound up. A light source 24 is installed between the cartridge 18 and the take-up reel 22 in correspondence with the microfilm 14. The light beam emitted from the light source 24 passes through image frames arranged along the optical axis, and is guided toward the screen 16 via an optical system composed of a lens 26 and a plurality of reflective mirrors 28. ing. This results in
The image recorded on the microfilm 14 can be enlarged and projected.

By changing the direction of reflection by the optical system (for example, by making the mirror 30 retractable along the optical axis as shown by the imaginary line in FIG. 1), the transmitted image can be transferred to a copying machine installed below the apparatus. [You can now be guided to 32.] The copying device 32 can enlarge and copy the image recorded on the microfilm 14.

FIGS. 2A and 2B show details of the loading section 20. The cartridge 18 is connected to a rotating shaft 42 of a supply motor 40 whose reel 34 (supply reel) is connected to a control device 38 via a torque control section 36 . Note that the supply motor 40 is controlled by the torque control section 36.
Microfilm 1 is transferred to reel 34 with the specified torque.
4 (in the direction indicated by the arrow in FIGS. 2(A) and 2(B)). The leading end of the microfilm 14 wound in a layer on the reel 34 was pulled out from the opening 44 provided in the cartridge 18 by the driving force of a loading roller of a loading mechanism (not shown), and wound around the guide roller 46.48. Thereafter, it is wound onto a take-up reel 22. Film detection sensors 49 and 51 for detecting the presence or absence of the microfilm 14 are arranged near each of the guide rollers 46 and 48.

The outer periphery of an endless conveyor belt 52 is in contact with the shaft 50 of the take-up reel 22 . This conveyor belt 52 has elasticity and is wound around guide rollers 54, 56, 58. Further, this conveyor belt 52 is wound around a drive reel 66 attached to a rotation shaft 64 of a take-up motor 620 connected to the control device 38 via a speed control section 60. Accordingly, the conveyor belt 52 is moved in the direction of arrow B in FIGS. 2A and 2B and in the opposite direction as the drive wheel 660 rotates.

The microfilm 14 is transported between the conveyor belt 52 and the shaft 50.
It is held between the conveyor belt 52 and is wound onto the shaft 50 or pulled out from the shaft 50 according to the movement of the conveyor belt 52.

Here, in the vicinity of the reel 34, a winding diameter detection sensor 63 is arranged as winding diameter measuring means.

This winding diameter detection sensor 63 is equipped with an actuator 67 that is rotatable around a shaft 65, and its tip is brought into contact with the outer periphery of the microfilm 14 wound on the reel 34 via a roller 69. There is.

The actuator 67 uses the biasing force of a torsion coil spring (not shown) attached to the shaft 65 to move the roller 6 at its tip.
9 is urged in the direction of contacting the outer periphery of the microfilm 14, so that the contact state is always maintained even if the diameter of the microfilm 140 wound on the reel 34 changes. The winding diameter detection sensor 63 reads the rotation angle of the actuator 67 and outputs a current value corresponding to this to the control device 3.
It is designed to output to 8.

A driven roller 68 is in contact with the conveyor belt 52 .

This driven roller 68 is attached to a rotating shaft 72 of an encoder 70, so that the drive state of the conveyor belt 52 can be detected by the encoder 70 as a Lux number. Encoder 70 is connected to control device 38 .

A slit plate 74 is provided between the guide roller 46 and the guide roller 48, slightly closer to the guide roller 46 than the optical axis. A pair of light receiving elements 76A and 76B are attached corresponding to the lower side B channel. Corresponding to the light receiving elements 76A and 76B, an LED 78 is attached to the opposite side of the microfilm 14, and the light rays emitted from the LED 78 and transmitted through the microfilm 14 are received by the light receiving elements 76A and 76B. . Light receiving elements 76A, 76B and L
Each ED 78 is connected to the control device 38.

As shown in FIG. 3, blip marks 80 are attached to both ends of the microfilm 14, and the light receiving element 7
The presence or absence of the blip mark 80 can be detected by the change in the amount of light received at 6.

The distance M between the light-receiving elements 76A, 76B and the optical axis is constant (75 mm in this example). Therefore, after detecting the designated image frame 14A with the light-receiving elements 76A, 76B, the distance M is moved by the distance M. By doing so, positioning can be performed along the optical axis.

The blip mark 80 includes a page mark 80P1 and, if necessary, a file mark 80F1 and a block mark 80.
B is used to classify a plurality of image frames 14A.

The control device 38 includes a CPU 82, a RAM 84, and a ROM 86.
, a human output port 88, and a bus 90 such as a luteta path and a control bus that connect these ports.

A keyboard 92 is connected to the human output port 88 . The keyboard 92 is normally used to specify the image frame to be projected onto the screen 16, and by entering the number required for the microfilm 14 used among the block number, file number, and page number, While conveying the film 14, the light receiving elements 76A, 7
6B to detect each mark and search for the designated image frame.

The RAM 84 stores a map showing the relationship between the current value from the winding diameter detection sensor 63 and the winding diameter. Therefore, the control device 38 controls the reel 34 according to the input current value.
The diameter r of the 140 rolls of microfilm can be determined.

Further, the RAM 84 stores in advance the tension Te and the moment of inertia J1 friction torque Tp generated in the microfilm 14, and the CPU 82 stores this tension Te.
, the acceleration/deceleration degree K of the supply reel obtained by multiplying the winding diameter r1 friction torque TF and the moment of inertia J by the amount of change in the winding diameter r and the microfilm transport speed V, as shown in the section of the effects of the invention. The torque T to be controlled by the torque control section 36 is calculated based on equation (1).

That is, by transforming the above equation (1), we obtain ・ ・ ・ (2), and calculate the torque T according to the change in the winding diameter r and the degree of acceleration/deceleration K.
Calculate. Note that the friction torque T is constant.

The operation of this embodiment will be explained below with reference to the flowchart of FIG.

First, the microfilm 14 to be used is inspected, and a suitable mode from among pre-stored modes is input from the keyboard 92 (step 200). This results in
Proceeding to step 202, parameters corresponding to the input mode are read from the RAM 84, and control is thereafter performed according to these parameters.

After a particular mode is set, first
Load 8. When it is determined in step 208 that the microfilm 14 has been loaded (for example, it is determined by the on/off state of a microswitch, etc.), the process moves to step 210 where the loading mechanism is activated and the loading roller comes into contact with the outer periphery of the microfilm 14. , pull out the tip. The pulled-out microfilm 14 reaches the take-up reel 22 via guide rollers 46, 48, and is connected to the conveyor belt 52 and shaft 50.
sandwiched between. As a result, microfilm 1
The moving force of the conveyor belt 52 is transmitted to the belt 4, and the belt 52 is wound onto the shaft 50. When a predetermined amount of the microfilm 14 has been wound onto the shaft 50, the movement of the conveyor belt 52 is stopped and the apparatus is in a standby state.

Here, in step 212, an image frame is specified using the keyboard 92. For example, if you input 3.2.10, the control device 38 recognizes that it is the 10th page of image frames recorded in the 2nd file of the 3rd block, and
The process moves to step 214 and the take-up motor 62 is driven (for example, forward rotation). When the take-up motor 62 rotates, the conveyor belt 52 is moved, and the microfilm 14 is wound onto the shaft 50 at the same time. In this case, the conveying speed is initially high as shown in FIG.

In the light receiving elements 76A and 76B, when the microfilm 14 is transported, the LED 78 and the light receiving element 76A.

Each blip mark 80 that passes between 76B and 76B is counted. That is, in this case, the block mark 80B is counted by 3, the file mark 80F is counted by 2, and the page mark 80F is counted by 10, and it is determined in step 216 whether or not a predetermined mark has been detected. If the determination is affirmative, Proceeding to step 217, the drive of the take-up motor 62 is stopped. If the determination is negative, the process moves to step 240, where the winding diameter detection sensor 63
Then, in step 242, the winding diameter r is determined from a map of the current value and the winding diameter r stored in the RAM 84.

In the next step 244, the obtained winding diameter r and the tension Te to be generated in the microfilm 14 stored in advance in the RAM 84 are used, and the friction torque TF is 1 for the acceleration/deceleration degree.
Based on the formula (2), the drive torque T of the supply motor 40 is calculated, and in step 246, the torque control unit 36 is set to the calculated torque T, and then the process moves to step 216. Therefore, until a predetermined mark is detected, the reel 34 is used when winding onto the take-up reel 22.
The driving torque of the supply motor 40 is changed according to a change in the diameter r of the microfilm 140 wound on the microfilm 140.

As a result, the tension Te generated in the microfilm 14 is always kept constant, so the tightness of the microfilm 140 on the take-up reel 22 can be kept constant, and the tension is reduced when the microfilm 140 is wound on the take-up reel 22. The microfilm 14 is compressed and deformed into a bellows shape, instead of being wound weakly on the inside and strongly wound on the outside.
Damage can be prevented.

A predetermined mark is detected in step 216, and step 21
7, the drive of the take-up motor 62 is stopped. After that, the process moves to step 218 and positioning is performed. That is, the microfilm 14 is not stopped immediately after the drive of the take-up motor 62 is stopped, but is stopped after being slightly overrun. When the microfilm 14 is completely stopped, the take-up motor 62 is stopped by rotating it in reverse at a low speed, as shown in FIG. In this case as well, there is a slight overrun, and as shown in FIG. 5, the designated frame is further rotated forward at a low speed and stopped at a predetermined position (a position taking into account the dimension M in FIG. 2(B)). This completes the positioning of the designated frame on the optical axis, and the image transmitted by the light source 24 can be projected onto the screen 16 (step 219).

In the next step 232, it is determined whether or not to copy the projected image, and if the determination is affirmative, step 23
After the copying process is performed in step 3, the process moves to step 234.

Further, if a negative determination is made in step 232, step 233 is skipped and the process proceeds to step 234.

In the next step 234, the loaded cartridge 18
It is determined whether or not the search is completed.

If a negative determination is made in step 234, step 21
2, and if no image frame is specified in step 212, steps 212 and 234 are repeated. Furthermore, if it is determined in step 234 that the process has ended, step 23
6, all the microfilms 14 are wound onto the cartridge 18, and the process ends.

As described above, in this embodiment, when the microfilm 140 is wound onto the take-up reel 22, the drive torque of the supply motor 40 is changed in accordance with the change in the winding diameter of the microfilm 140 wound onto the reel 34. , the tension generated on the microfilm 14 can be kept constant,
The tightly wound state of the microfilm 14 on the take-up reel 22 can be kept constant.

In this embodiment, the winding diameter detection sensor 63 is connected to the reel 34.
Although it is installed on the side, it is also possible to install it on the take-up reel 22 side and determine the winding diameter of the microfilm 14 wound on the reel 34 from the winding diameter of the microfilm 14 wound on the take-up reel 22. .

Furthermore, in this embodiment, the winding diameter is measured mechanically, but it may also be determined by calculation from the feeding amount of the microfilm 14, or by measuring the feeding amount of the microfilm 14 for each rotation of the reel 3401. Other means for measuring the winding diameter, such as calculating from the amount, may be applied.

〔Effect of the invention〕

As explained above, the microfilm retrieval device according to the present invention has the excellent effect of being able to properly wind up the microfilm and preventing damage to the microfilm.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a reader printer according to this embodiment;
Figure 2 (A) is a perspective view of the vicinity of the cartridge loading section, Figure 2 (B) is a schematic block diagram of the vicinity of the cartridge loading section, and Figure 3 shows an example of microfilm with blip marks attached. Plan view, FIG. 4 is control flow chart 4,
FIG. 5 is an explanatory diagram showing speed control for positioning image frames. DESCRIPTION OF SYMBOLS 10... League printer, 14... Microfilm, 22... Winding reel (winding side reel), 34... Reel (supply side reel), 38... Control device, 40... Supply motor, 62... Take-up motor, 63... Winding diameter detection sensor.

Claims (1)

[Claims] (1) A supply reel that winds a long microfilm in layers, a take-up reel that winds the microfilm pulled out from the supply reel in layers, and a take-up reel that winds the microfilm or a main drive means for transporting the microfilm by rotating it in the pull-out direction; a sub-drive means for rotating the supply reel in the microfilm winding direction; a speed detection means for detecting the transport speed of the microfilm; a winding diameter measuring means for measuring the winding diameter of the microfilm being wound onto the supply reel;
A microfilm retrieval device that searches for image frames to be searched in a state where tension is generated in the microfilm between a take-up reel and a supply reel, the retrieval device comprising: The torque of the auxiliary drive means is adjusted so that the tension is constant according to the roll diameter, the moment of inertia of the supply reel, the degree of acceleration/deceleration of the supply reel obtained from the amount of change between the roll diameter and the microfilm transport speed, and the friction torque. A microfilm retrieval device having a torque control means for controlling.