JPH0922066A - Method for tightly winding film for microfilm reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the possibility that the engaging part of a reel or a reel driving shaft is damaged and to complete tight winding in a short time driving by high-toque thereafter by driving the reel driving shaft at low speed torque while the reel driving shaft is rotated at least once at the beginning after it enters the shaft hole of the reel. SOLUTION: A timer sets fine tight winding time t1 and succeeding normal tight winding time t2 when the excitation of an electrode solenoid 86 is stopped, that is, when the reel driving shaft 70 is surely projected at a projection position. The timer switches to cause a low torque control part to drive a motor 72 at low torque for the time t1 , and a high torque part to drive the motor 72 at high torque for the time t2 . The time t1 is set long enough to rotate the shaft 70 at least once. Since the shaft 70 is rotated at the low torque for the fixed time t1 long enough to rotate the shaft 70 at least once after the shaft 70 enters the shaft hole 66 of the reel 62, an engaging pawl 74 is surely engaged in an engaging groove 68 while the shaft 70 is rotated. Then, the shaft 70 is rotated at the high torque thereafter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a microfilm reader using a cartridge containing a reel around which a microfilm is wound, and relates to a method of tightening a film when the cartridge is loaded.

[0002]

2. Description of the Related Art A microfilm reader is known in which a reel wound with a microfilm is housed in a cartridge, and the cartridge is used for searching and image reading.

In this case, the microfilm housed in the cartridge is loosely wound due to the elasticity of the film itself when it is not loaded in the microfilm reader. Therefore, when this cartridge is loaded in the microfilm reader, the slack of the film is taken, the leading end of the film is guided to the other take-up reel side, and the search is started.

In order to loosen the film, a method of rotating a reel at a high speed in the film winding direction has been conventionally used. When the rotation is suddenly stopped after the film is rotated in this direction at a high speed, the elasticity of the film loosens the film, and the leading end of the film projects from the cartridge. Therefore, it is easy to take out the beginning of the film.

[0005]

In the conventional method, the reel drive shaft is made to enter the shaft hole of the reel after the cartridge is loaded, and the reel drive shaft is immediately rotated at a high speed.

However, since the reel drive shaft suddenly starts to rotate at high speed in a state where the reel drive shaft and the reel are not completely engaged with each other, the engagement portion between the reel drive shaft and the reel shaft hole may be damaged. . In particular, ANSI (American National Stande) is provided in which one groove is provided in the reel shaft hole, and the claw having a tendency to project in the outer diameter direction is engaged with the groove on the reel drive shaft.
rd of Industry), the impact at the time of engagement will be significantly large. Therefore, there is a problem that the rotation speed of the reel drive shaft at the time of film winding is limited, and the film winding time becomes long.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and when a film is wound by rotating the reel in a winding direction when a cartridge is loaded, a reel drive shaft and a shaft hole of the reel are provided. An object of the present invention is to provide a film winding method for a microfilm reader, which is capable of performing a swift tightening without damaging the engaging portion with the.

[0008]

According to the present invention, an object of the present invention is to search for a microfilm after the reel is rotated and wound in the winding direction of the microfilm when the cartridge for storing the microroll film wound on the reel is loaded. And a film winding method of a micro film reader for reading an image, wherein a reel driving shaft is engaged with a shaft hole of the reel when the loading of the cartridge is completed, and the reel driving shaft has a low torque in at least one rotation of the film winding direction. It is achieved by a method of winding a film in a microfilm reader, which comprises rotating the same in the same direction with high torque after rotating the same.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a microfilm reader embodying the present invention, FIG. 2 is a perspective view showing the inside of a scanner used therein, and FIG. 3 is a sectional view showing a cartridge and a reel drive section. 4 is a perspective view of the cartridge and the reel drive shaft, FIG. 5 is a block diagram showing the function of the reel drive device, and FIG. 6 is an operation timing diagram of the same.

In FIG. 1, reference numeral 10 is a computer main body, which incorporates a CPU and the like. Reference numeral 12 is a display device such as a CRT or liquid crystal plate, and 14 is a keyboard, which are mounted on a desk 16. Reference numeral 18 is a scanner housed under the desk 16, and 20 is a printer placed beside the desk 16.

The scanner 18 has a cartridge insertion port 22 on the upper front surface thereof, and the cartridge 2 inserted therein.
4 (see FIGS. 2, 3, and 4), the image on the microfilm 26 is read. The read image is subjected to predetermined image processing by the CPU provided in the scanner 18 or the like, and after the image of the blip or the black frame is erased, it is displayed on the display device 12, printed out to the printer 20, or magneto-optical. It is stored in a disk or the like, or transferred to an external processing device.

The scanner 18 has a vertically long casing 28, and a supply reel driving unit 30 is provided above the front portion of the casing 28.
A take-up reel drive unit 32 is arranged below the front portion. The supply-side reel drive unit 30 has a cartridge insertion port 2
When the cartridge 24 is inserted into the cartridge 2, the film 26 is wound up, and then the leading end of the film 26 is pulled out and fed downward to be guided to the take-up reel 34 of the take-up side reel drive unit 32. The method of winding the film 26 will be described later.

As shown in FIGS. 2 and 3, the film 26 passes through the rear side of the gap between the reel driving sections 30, 32, that is, the rear side as viewed from the front of the housing 28. Therefore, a space is formed between this gap and the front panel of the housing 28, and the light source lamp 36, the condenser lens 38, and the reflection plate 40 are housed therein.

The take-up reel drive unit 32 includes a reel 34.
It has a drive belt (not shown) that travels in contact with. This drive belt has a guide roller, a drive roller,
It is wound around an encoder, a tension roller, etc., and is driven and driven in the film winding direction by a drive roller.

Next, the line sensor drive section 42 will be described.
The line sensor drive unit 42 is integrated with the projection lens 44. That is, as shown in FIG. 2, in the case of the line sensor driving unit 42, the cylindrical unit 4 that holds the projection lens 44 is provided.
6 are integrally formed. The projection lens 44 held by the tubular portion 46 has a fixed focus and a magnification of about 2 times.

A movable base 48 is attached to the case so as to face the tubular portion 46. That is, this movable table 48
Is a pair of guide rods fixed to the case (not shown)
Slidably held by the optical axis 50 near the opening of the cylindrical portion 46.
It is possible to reciprocate in the direction orthogonal to.

A belt 56 wound around pulleys 52 and 54 is provided in the case in parallel with the reciprocating direction of the movable base 48, and one side of the movable base 48 is fixed to the belt 56. Further, one pulley 54 is driven by a stepping motor 58. As a result, the movable table 48 can be reciprocated on a plane orthogonal to the optical axis 50 by rotating the stepping motor 58 forward and backward.

A CCD line sensor 60 is fixed to the movable table 48 in a direction orthogonal to the guide rod, that is, in a direction orthogonal to the reciprocating direction of the movable table 48. CCD
The light receiving surface of the line sensor 60 is, of course, matched with the image forming surface of the projection image of the projection lens 44.

Next, the drive unit of the cartridge 24 will be described. This driving unit has a structure according to the ANSI standard. As shown in FIGS. 3 and 4, the cartridge 24 has a reel 62 on the supply side, and the microroll film 26 is wound around the reel 62. The scanner 18 has an insertion port 2
When the cartridge 24 is inserted from 2, the loading detection sensor 64 (FIG. 2) such as a micro switch indicates the completion of loading.
Is detected by

The reel 62 is, as shown in FIG.
According to the standard, the shaft hole 66 has a square section, and an engagement groove 68 is formed on the inner surface of the shaft hole 66 along the axial direction. A reel drive shaft 70 that can move forward and backward can be inserted into the shaft hole 66. The reel drive shaft 70 is common to the shaft of the motor 72 and is slidable in the motor 72 in the axial direction.

A slit is cut in the axial direction at the tip of the reel drive shaft 70, and an engaging claw 74 is attached between the slits. That is, the engaging claw 74 is provided on the reel drive shaft 70.
Is attached swingably with a pin 76 located on the tip side of
A habit of returning is imparted so that the rotating end projects in the outer diameter direction by a spring (not shown). Reel drive shaft 70
The stopper 7 having a substantially disk shape is adjacent to the engaging claw 74.
8 are attached.

Between the stopper 78 and the motor 72, a member 80 having a substantially bobbin shape is mounted so as to be rotatable and immovable in the axial direction. One end of a balance-shaped lever 84 is engaged with the annular groove 82 of this member 80. A plunger 88 of an electromagnetic solenoid 86 is connected to the other end of the lever 84. This plunger 88
Is positioned at the protruding position and the returning position by a click mechanism (not shown) or the like.

The exit position of the reel drive shaft 70 is detected by the axis sensor (1) 90, and the entrance position is detected by the axis sensor (2) 92. These axis sensors (1) 90 and (2) 92 can be constituted by, for example, microswitches which are turned on when the flange of the member 80 hits.

Therefore, when the reel drive shaft 70 is moved to the right side in FIG. 3 by the solenoid 86, the reel drive shaft 7 is moved.
0 exits from the shaft hole 66, and in this state, the cartridge 24
Exchange becomes possible. When the reel drive shaft 70 is moved forward after the cartridge 24 is loaded, the engaging claws 74 are engaged with the engaging holes 66.
It is pushed by the inner wall surface of the and falls, and the stopper 78 comes into contact with the reel 62. When the reel drive shaft 70 is rotated at least once, the engaging claw 74 projects into the engaging groove 68 so as to face the engaging groove 68 during that time. As a result, the reel drive shaft 70 is brought into an engaged state in which the rotation of the reel drive shaft 70 is transmitted to the reel 62.

In FIG. 5, reference numeral 94 is a plunger exciting circuit. This circuit 94 excites the electrode solenoid 86 at the timing shown in FIG. That is, when the cartridge loading detection sensor 64 detects loading of the cartridge 24, the solenoid 86 is excited to drive the reel drive shaft 70.
To protrude. The reel drive shaft 70 starts moving, the axis sensor (1) 90 is turned off, and the axis sensor (2)
When 92 is turned on, it is determined that the reel drive shaft 70 is correctly projected, and the excitation of the solenoid 86 is stopped. The reel drive shaft 70 is held in this position thereafter.

In FIG. 5, 96 is a timer. This timer 9
6 sets the time for rotating the reel 62 in the winding tightening direction. A winding tightening control unit 98 has a low torque control unit 100 and a high torque control unit 102 for driving the motor 72 with low torque and high torque, and a changeover switch 104.

As shown in FIG. 6, the timer 96 is used when the excitation of the electrode solenoid 86 is stopped, that is, the reel drive shaft 70.
From the time when it comes out to the protruding position, the weak winding time t ₁
And the subsequent main winding time t ₂ are set. The timer 96 sets the changeover switch 104 so that the low torque control unit 100 drives the motor 72 with a low torque during the time t _{1 and} the high torque control unit 102 drives the motor 72 with a high torque during the time t _2. Switch. Here, the time t ₁ is set to a time sufficient for the reel drive shaft 70 to rotate at least once.

In FIG. 5, reference numeral 106 denotes a film feed control unit, which controls the film 2 after the winding of the film 26 is completed.
6 is sent out to control the motor 72 to perform the original search. That is, one of the output of the winding tightening control unit 98 and the output of the film feed control unit 106 is selected by the changeover switch 108 and sent to the motor 72. Here, the changeover switch 108 is changed over by the timer 96 when the time t ₂ of the final winding has elapsed.

According to this embodiment, after the reel drive shaft 70 enters the shaft hole 66 of the reel 62, the reel drive shaft 70 rotates at a low torque for a fixed time t ₁ at which at least one rotation is possible. It is securely engaged in the engaging groove 68. After that, the reel drive shaft 70 and the reel 62 rotate because they rotate with high torque.
There is no danger of damaging the engaging part with and the tightening can be performed at high speed.

In the above embodiment, the weak winding amount is set to the time t.
_{Although the value} is set to ₁ , it goes without saying that the number of revolutions may be detected instead of the time t ₁ . Further, since the weak tightening is performed with a low torque, it can be achieved with a simple structure. For example, when a DC motor is used as the motor 72, this can be achieved by simply reducing the drive current.

Although the above embodiment is applied to the ANSI standard cartridge 24, the present invention is not limited to this.

[0032]

As described above, according to the first aspect of the present invention, since the reel drive shaft is driven with the low speed torque for at least one rotation after the reel drive shaft is inserted into the shaft hole of the reel, the reel drive shaft and the reel are not driven. Until the engagement of is completed, it is surely driven with a low torque. Therefore, a large impact is not applied to this engaging portion, and there is no risk of damaging the engaging portion of the reel or the reel drive shaft. After that, since the driving is performed with high torque, the winding tightening can be completed in a short time.

An ANSI standard cartridge can be used as the cartridge (claim 2). In this case, the engaging claw of the reel drive shaft suddenly engages with the engaging groove of the reel, but at that time. The impact of is sufficiently small and the effect of protecting the engaging portion is particularly great. Further, if the tightening by low torque is set by the timer in time, it is not necessary to detect the number of rotations, and the structure is simple (claim 3).

[Brief description of drawings]

FIG. 1 is a diagram showing a microfilm reader.

FIG. 2 is a perspective view of a scanner.

FIG. 3 is a sectional view showing a cartridge and a reel driving unit.

FIG. 4 is a perspective view of a cartridge and a reel drive shaft.

FIG. 5 is a block diagram showing functions of a reel driving device.

FIG. 6 is an operation timing chart.

[Explanation of symbols]

 10 computer main body 12 CRT display device 14 keyboard 18 scanner 20 printer 24 cartridge 26 microfilm 54 line sensor driver 56 projection lens 62 reel 66 shaft hole 68 engagement groove 70 reel drive shaft 72 motor 74 engagement claw 96 timer 98 winding tightening Control unit

Claims (3)

[Claims] 1. When a cartridge for storing a microroll film wound on a reel is loaded, the reel is rotated in a winding direction of the microfilm to tighten the reel.
In a film winding method of a microfilm reader for searching for a microfilm and reading an image, a reel drive shaft is engaged in a shaft hole of the reel when the loading of the cartridge is completed, and the reel drive shaft is wound at least one rotation. A method for tightening a film in a microfilm reader, which comprises rotating with a low torque in one direction and then with a high torque in the same direction. 2. A reel shaft is provided with one engaging groove parallel to the shaft hole, and a reel drive shaft is provided with a habit of returning to the outer diameter so as to engage with the engaging groove. The method of winding a film of a microfilm reader according to claim 1, wherein the engaged claw is provided. 3. The film winding method for a micro film reader according to claim 1, wherein the reel drive shaft is rotated at a low torque for a fixed time set by a timer.