JPH0518745Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention uses a cassette containing a supply reel and a take-up reel, and by selectively driving either of these reels, the film can be rolled. The present invention relates to a portable microfilm reader that performs feeding.

[Conventional technology]

For example, a microfilm reader is used to enlarge a photographic image recorded on a 16mm wide roll film to about A4 size for viewing. Such a microfilm reader includes a cassette loading section into which a cassette containing wound microfilm is loaded, a light source section which illuminates a predetermined frame of microfilm pulled out from the cassette, and an image of the illuminated predetermined frame. It includes a projection optical system that magnifies and projects an image, and a screen on which an enlarged image projected by the projection optical system is projected.

However, in order to feed the microfilm wound and stored on the supply reel in the cassette to the take-up reel side, or to freely search for the desired film frame, it is necessary to It is necessary to use a film feeding mechanism that can selectively drive one of the take-up reels and can stop feeding the film at a predetermined timing.

[Problem that the invention attempts to solve]

Against this background, film feeding mechanisms have conventionally been used in which the supply and take-up reels can be selectively driven in their respective rotational directions. However, in conventional film feeding mechanisms, the film feeding speed tends to become unstable when switching the film feeding direction, and when the film feeding is stopped, the film gate The drawback was that the film would flap around inside the camera and the surface of the film would be easily scratched.

The present invention was developed in order to solve the problems of the conventional technology, and provides a portable microfilm reader that uses a feeding mechanism that maintains stable film feeding and has a simplified structure. The purpose is to provide.

[Means for solving problems]

In order to achieve the above object, the present invention provides a reel gear for rotating the drive shaft of each of the cassette supply reels and take-up reels, and selectively engages and disengages the drive gear driven by a motor with the reel gear for rotating the respective drive shafts, and provides each drive gear with a brake means via a one-way clutch. When one of the reel gears is engaged with the drive gear and driven, the brake means operates only on the other driven reel gear via the one-way clutch.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

〔Example〕

In FIGS. 1 and 2 showing the microfilm reader using the present invention in an unused state and a used state, respectively, the reader main body 1 has an upper lid that can be opened and closed via a well-known hinge mechanism provided at the rear end. 2 is installed. When the buttons 3 provided on both sides of the top cover 2 are pressed in the state shown in FIG. As the screen 5 opens, the screen 5 rises up to follow this.

A plurality of light shielding plates 8 are provided on both sides between the screen frame 7 holding the screen 5 and the reader body 1. These light shielding plates 8 are composed of a plurality of blades as will be described later, and are sequentially pulled out as the screen 5 rises to form a triangular shape formed by the reader body 1, the upper lid 2, and the screen frame 7. Shade the open part of the Further, since the upper lid 2 blocks light from the back side of the screen 5, the rear side of the screen 5 is kept completely shielded from light by the upper lid 2, the light shielding plate 8, and the reader main body 1.

A keyboard 10 and a liquid crystal display panel 11 are provided on the front side of the reader main body 1. When in use, the liquid crystal display panel 11 is erected as shown in FIG. 2 and held in a position where the display can be easily viewed. Further, as will be described in detail later, the keyboard 10 and the liquid crystal display panel 11 are raised as shown in FIG. 4, and the cassette 12 can be loaded and unloaded in this state.

The cassette 12 includes a supply reel 13 and a take-up reel 14, as shown in FIG. 3A. The cassette 12 includes a guard panel 15 which is normally locked in the closed position. When the lock release button 16 is pressed, the guard panel 15
is unlocked and can be opened as shown in FIG. 3B. Guard panel 15
is released, the microfilm 2
0 is exposed. A magnetic tape 21 is connected to the leading end of the microfilm 20, and search information and the like regarding the image taken on the microfilm 20 are recorded on the magnetic tape 21. Furthermore, blip marks 20a are recorded on the margins of each frame of the microfilm 20, and as is well known, by optically detecting these, the number of frames to be advanced can be counted. At the bottom of the cassette 12, insert the microfilm 20 to the back side.
A space 18 is formed. As will be described later, during use, a part of the illumination optical system enters this space 18 to provide illumination from the back side of the microfilm 20.

In FIG. 5, which shows the arrangement of the optical system in use, the space 18 formed in the cassette 12 includes a cold mirror 25 for directing illumination light from the lamp 23 and the light source mirror 24 toward the microfilm 20. will be entered. As is well known, the cold mirror 25 transmits heat rays and reflects visible light.
prevents it from getting too hot. Further, the cold mirror 25 is held by a raised piece 27a of a chassis 27 made of a metal plate.
a acts also as a heat sink for absorbing and dissipating the heat transmitted from the cold mirror 25.

In addition to the condensing lenses 28 and 29, the chassis 27 is attached with a pressure plate 30, a projection lens 32, and a trapezoidal prism 33 for changing the image attitude. Pressure plate 3
0 can move in the direction of the projection optical axis P, as is well known. When the cassette 12 is loaded, the microfilm 20 is moved to the right by a solenoid (not shown) to facilitate insertion of the microfilm 20 into a predetermined film gate. Prevents movement in the axial direction. Furthermore, the projection lens 32 can be moved forward and backward along the projection optical axis P for focus adjustment.
The trapezoidal prism 33 has the function of inverting the left and right sides of the image taken on the microfilm 20 so that it can be viewed as a correct image on the screen 5. The reproduced light beam passing through the photographic lens 32 and the trapezoidal prism 33 is reflected by the mirror 35 and then projected onto the back surface of the screen 5. In addition, screen 5
This trapezoidal prism 33 can be omitted if the image is photographed on the microfilm 20 while taking into account the above image orientation. Further, if the trapezoidal prism 33 is made rotatable about the projection optical axis P, the attitude of the image on the screen 5 can be changed by rotating the trapezoidal prism 33.

The mirror 35 is supported by a mirror frame 37 via a mirror holding plate 36 bonded to its back surface. A leaf spring 38 is interposed between the mirror frame 37 and the front surface of the mirror 35, and the mirror 35 is fixed to the mirror frame 37 by tightening a screw 39 screwed into the rear surface of the mirror frame 37. The tilt can be adjusted. The mirror frame 37 has a pin 4 that engages with a straight groove 41 formed in the side plate 40.
2 is fixed. A spring 43 is placed between the pin 42 and the side plate 40, urging the pin 42 to the right. Further, a mirror arm 47 whose one end is pivoted to the shaft 45 of the side plate 40 is pivoted to the other end of the mirror frame 37 .

A cam groove 50 is formed in the mirror arm 47,
This cam groove 50 is engaged with a pin 53 which is installed at the other end of a screen arm 52 whose one end is pivoted to the screen frame 7 . This pin 53, the shaft 5 which connects the mirror frame 37 and the mirror arm 47
A spring 55 is applied between the screen arm 52 and the screen arm 52, and biases the screen arm 52 counterclockwise around a shaft 56. Furthermore, a guide groove 58 is formed on the inner surface of the side plate 2a of the upper lid 2, the lower part of which is a wide part 58a. The screen frame 7 is rotatable with respect to the side plate 40 by a shaft 60, and a pin 61 protruding from the tip of the screen frame 7 engages with the guide groove 58.

When folding the screen after use, first push the screen frame 7 and rotate it clockwise about the shaft 60. As a result, the pin 53 at the tip of the screen arm 52 is guided by the inclined portion 50a of the cam groove 50, so that the screen arm 52 resists the bias of the spring 55 and smoothly rotates clockwise around the shaft 56 at the time of startup. It begins to descend while moving. In addition, at this time, the upper lid 2 comes to be slightly lifted in the opening direction. By further pushing down the screen frame 7, the screen arm 52 is moved so that the pin 53 is aligned with the straight portion of the cam groove 50.
The screen frame 7 is rotated clockwise until it comes into contact with the end of the screen 0b, and the screen frame 7 is folded up accordingly. During this time, the pins 61 of the screen frame 7 move along the guide grooves 58, so that the upper lid 2 gradually closes in conjunction with the fall of the screen frame 7.

Then, after the pin 53 reaches the end of the linear portion 50b of the cam groove, when the screen frame 7 is further pushed down, the mirror arm 47 is pushed down by the edge of the screen frame 7, and the mirror arm 47 is pushed down by the edge of the screen frame 7.
is now rotated clockwise about the shaft 45. The tip of the mirror arm 47 is pivoted to the mirror frame 37 via a shaft 54, and is further attached to the mirror frame 37.
Since the protruding pin 42 engages with the straight groove 41 of the side plate 40, the mirror arm 4
7 rotates clockwise, the mirror frame 3
7 rotates clockwise around the pin 42 while sliding to the left against the bias of the spring 43.

In this way, by pushing down the screen frame 7, the mirror 35 and the top lid 2 are folded.
As shown by the two-dot chain line in FIG. 5, when the pin 61 of the screen frame 7 reaches the wide part 58a of the guide groove 58, the interlock between the lowering of the screen frame 7 and the closing of the top cover 2 is cut off. Become. At this point, while holding down the screen frame 7 with one hand, push down the top cover 2 with the other hand, and the pin 6 of the screen frame 7
1 is pushed by the upper edge of the wide portion 58a, the screen frame 7 is also folded down in conjunction with the closing of the top lid 2, and thereby the mirror 35 is also folded. When the upper cover 2 is completely lowered to the closed position, the hook 4 (FIG. 1) is engaged with a locking hole formed in a required portion of the reader body 1, and is folded as shown in FIG. 6. In addition, in FIG. 6, springs 43 and 55 are shown in order to avoid complication of the drawing.
etc. are omitted. By being folded in this manner, the outer shape of the microfilm leader becomes a thin box shape as shown in FIG.

When raising the lid 2 from the state shown in FIG. 52, the screen frame 7 rises toward the use position shown in FIG. Finally, lift the screen frame 7 and insert the pin 53 into the cam groove 5.
It is brought into contact with the end of the inclined portion 50a of 0 and set in the use position shown in FIG.

A bottom plate 66 made of a metal plate is supported in a part of a plastic exterior case 65 to which a side plate 40 made of a metal plate is fixed so as to be openable and closable. A lamp mounting portion 67 for attaching the lamp 23 and a light source mirror 24 are fixed to this bottom plate 66. Therefore, when the bottom plate 66 is opened as shown by the two-dot chain line in FIG. Since the lamp 23 is exposed to the outside, the work of replacing the lamp 23 becomes very easy. In addition, since the metal bottom plate 66 is not covered by the outer case 65 and directly faces the outside, it is advantageous in dissipating the heat from the lamp 23 to the outside. can improve the heat dissipation effect.

As shown in FIG. 7, power supply units 70 are located near the back and center of the reader body 1, respectively.
and a control unit 71 are installed. The power supply unit 70 includes an AC-DC converter, a voltage stabilization circuit, etc., and has a socket 73 for a plug 72 for supplying AC power. The control unit 71 also includes various control circuits for controlling the driving of a motor for feeding and rewinding the microfilm 20, counting the number of film frames, and searching for a predetermined frame. including. A cassette holder section for receiving a cassette 12 and a film drive mechanism such as a motor are installed on the front side of the reader main body 1, that is, below the keyboard 10, so that the weight tends to be biased toward the front. Therefore, by installing the heavy power supply unit 70 on the back side of the reader main body 1, weight balance can be achieved. In this way, by balancing the weight distribution within the reader body 1, it becomes easier to carry and at the same time improves the stability when installed during use.

A chassis 27 fixed to the inner surface of the exterior case 65 with the same inclination as the projection optical axis P engages with the hub of either the supply reel 13 or the take-up reel 14 housed in the cassette 12, so that either A pair of driving shafts 73 and 74 are provided.
These drive shafts 73 and 74 are driven by rotation of reel gears 75 and 76, respectively. As illustrated with respect to the drive shaft 74 in FIG. 8, the drive shaft 74 rotates together with the shaft 76a of the reel gear 76, but has a degree of freedom in the vertical direction due to the coil spring 77.

Driven gears 80 and 81 that rotate coaxially are provided below the reel gears 75 and 76, respectively. These reel gears 75, 76 and driven gear 8
0 and 81 are each connected via one-way clutches. That is, as illustrated on the take-up reel side in FIGS. 7 and 8, the reel gear When the gear 76 rotates counterclockwise, the driven gear 81 rotates. On the other hand, on the supply reel side, the driven gear 8 only rotates when the reel gear 75 rotates clockwise.
0 rotates in a driven manner. Brake gears 83 and 84 mesh with each driven gear 80 and 81, respectively. The brake gears 83 and 84 are the eighth
As shown in the figure, a rotational load is applied to the brake gear 84 by the compressed coil spring 85, so that when the driven gears 80, 81 rotate, resistance is added to the rotation of each reel gear 75, 76. It's summery.

The reel gears 75 and 76 are rotated by the driving force of a motor 88 fixed to a chassis 86.
That is, when the bevel gear 89 rotates clockwise due to the rotation of the motor 88, the chassis 8
An interlocking gear 91 rotates counterclockwise via a gear 90 (see FIG. 9) that rotates together with a bevel gear 89 on the back side of the gear 6. A swingable gear arm 94 is attached to the shaft 92 of the interlocking gear 91.
An oscillating gear 95 that meshes with the interlocking gear 91 is pivotally attached to the gear arm 94 . When the interlocking gear 91 rotates counterclockwise as described above, the gear arm 94 rotates counterclockwise to the position where it contacts the stopper 96a due to the rotational force generated by the meshing of the interlocking gear 91 and the oscillating gear 95. to sway. As a result, the oscillating gear 95 meshes with the reel gear 75, so that the reel gear 75 rotates counterclockwise.

In this way, when the reel gear 75 is rotated counterclockwise by the driving force of the motor 88, the microfilm 20 that has been wound around the take-up reel 14 of the cassette 12 is rewound onto the supply reel 13. . On the other hand, the reel gear 76 is driven to rotate counterclockwise by the tension of the micro film 20, but when the reel gear 76 rotates counterclockwise, the rotation is transmitted to the driven gear 81, so that the brake is not applied. Gear 84 operates to provide resistance to reel gear 76. As a result, an appropriate tension is always applied to the microfilm 20 during rewinding, and the feeding of the film is maintained stably.Even if the film is suddenly stopped during high-speed rewinding, the microfilm 20 This prevents the film from flapping around a predetermined film gate and causing scratches on its surface, and maintains good adhesion between the magnetic head and the magnetic tape 21.

When the motor 88 is reversed and the bevel gear 89 is rotated counterclockwise, the gear arm 94 swings to a position where it comes into contact with the stopper 96b, the take-up reel 14 is driven via the reel gear 76, and the microfilm 20 is fed forward. Ru. In this case, since the reel gear 75 rotates clockwise, a load is applied to the supply reel 13 via the driven gear 80 and the brake gear 83, and an appropriate tension is similarly applied to the microfilm 20. Become. A positioning pin 97 is provided on the chassis 27 and engages with a positioning hole formed in the bottom of the cassette 12 when the cassette 12 is loaded.

The cassette 12 is loaded after the keyboard 10 is popped up, as shown in FIG. By popping up the keyboard 10, the cassette holder 100 is exposed.
In FIGS. 9 and 10 showing the pop-up mechanism of the cassette holder 100, link levers 101 and 102 connected in an X-shape are attached to both sides of the chassis 27, respectively. One end of the link lever 101 is pivoted to the chassis 27 together with the other link lever by a connecting shaft 103. Further, a foot lever 105 is also pivotally attached to this connecting shaft 103. When the foot lever 105 drives the solenoid 106, the ninth
When the solenoid 106 is rotated to the right to the position shown in the figure and the drive of the solenoid 106 is cut off, the spring installed in the solenoid 106 is biased to the position shown in FIG.

The other end of the link lever 101 is engaged with a straight groove 109 of the holder base 108 via a pin 107 implanted therein. The pin 110 implanted at one end of the other link lever 102 connects the straight portion 111a and the inclined portion 11 formed on the chassis 27.
It engages with a cam groove 111 consisting of 1b. The other end of this link lever 102 is pivotally attached to a holder base 108 by a shaft 104. These link levers 101 and 102 are pivoted to each other at their intermediate portions, and
It is biased by a spring 112 toward the upright position shown in FIG. Note that in this upright position, in order to facilitate insertion of the cassette 12,
The opening 100a of the cassette holder 100 is set upward.

A lock release plate 114 made of a leaf spring is provided on one side of the cassette holder 100, and the tip thereof projects into the cassette holder 100.
Therefore, when the cassette holder 100 is popped up and the cassette 12 is inserted into the holder to a predetermined position as shown in FIG. 9, the tip of the lock release plate 114 presses the lock release button 16, and the guard panel 15 becomes openable.
After inserting the cassette 12 into the cassette holder 100 in this way, by pressing down on the keyboard 10, the cassette 12 can be inserted into the cassette holder 100.
Move each 0 to the playback position.

While the cassette 12 is descending together with the cassette holder 100, the guard panel 15
The lower edge of the guard panel comes into contact with a projection 115 formed on the chassis 27 as a raised portion for opening the guard panel. Then, by further lowering the cassette holder 100, the projections 11
5 allows the guard panel 15 to be lifted up. When the guard panel 15 is lifted, the liquid crystal display panel 11 is rotated to the left against the return spring 116 by the guard panel 15. When the loading completion position shown in FIG. 10 is reached, the hook lever 105 engages the shaft 104, and the cassette holder 100 is held at that position. In this state, the keyboard 10 is housed within the outline of the reader body 1, and the liquid crystal display panel 11 is erected to a predetermined angle.

As shown in FIG. 4, the holder base 108 has an opening 1 through which the drive shafts 73 and 74 pass.
In addition to 17 and 118, an opening 119 for protruding the positioning pin 97 is formed, so that when the cassette holder 100 reaches the loading completion position shown in FIG. 10, the cassette 12 is correctly positioned. Supply reel 13, take-up reel 14
respective hubs engage drive shafts 73, 74. In addition, as illustrated in FIG. 8, the drive shaft 74
The upper end of the pawl 74a is formed into a tapered surface, and when the drive shaft 74 engages with the hub 14a of the take-up reel 14, it slightly moves the take-up reel 14 in the take-up direction (the seventh It acts to rotate it (clockwise in the figure). The upper end of the claw that is integrated with the other drive shaft 73 is tapered in the opposite direction, and when engaged, the supply reel 13
It acts to rotate in the rewinding direction (counterclockwise in FIG. 7). As a result, the drive shaft 73,
When the reels 74 engage with the respective reels 13 and 14, the drive shafts 73 and 74 are engaged without causing any jamming in the gear series connected to the drive shafts 73 and 74.
74 smoothly engages with the respective hubs of the supply reel 13 and take-up reel 14.

When using the microfilm reader configured as described above, first connect the AC plug 72 to the connector 73 to supply power to the power supply unit 70. The control unit 71 is activated by power supplied from the power supply unit 70, and each control circuit is placed in a standby state. Then, when the button 3 is pressed, the top lid 2 and the screen 5 slowly rise up due to the bias of the springs 43 and 55. and,
When this standing up is interrupted, by pulling up the screen frame 7 toward you, the screen 5,
Mirror 35 is set in a predetermined use position. In conjunction with this, the plurality of blades stored in an overlapping manner are also lifted one after another, and a dark box is formed on the back side of the screen 5 by the case body 1, the upper lid 2, and the light shielding plate 8.

When a predetermined key is input from the keyboard 10, the solenoid 106 is driven for a certain period of time, during which time the lever lever 105 rotates from the lock position shown in FIG. 10 to the unlocked position shown in FIG. When the foot lever 105 moves to the release position in this manner, the link levers 101 and 102 are erected by the bias of the spring 112, and the cassette holder 100 is popped up to the position shown in FIG. 4 or FIG. 9. At this time, in order to prevent the cassette holder 100 from popping up suddenly, it is desirable to provide a shock absorber such as an oil damper at an appropriate location.

Cassette holder 1 popped up in this way
A cassette 12 is inserted into 00. Cassette 1
2 is inserted a certain amount, the lock release plate 114 comes to press the lock release button 16 of the cassette 12, and the guard panel 15 is unlocked. After inserting the cassette 12 to this state, the keyboard 10 is pushed down against the spring 112.
As a result, the keyboard 10 and the cassette holder 100 become parallel to the chassis 27 via the link levers 101 and 102, and then descend directly below. In the middle of this descent, the protrusion 115 provided on the chassis 27 comes into contact with the edge of the guard panel 15, and the guard panel 15 becomes relatively lifted.

When the cassette holder 100 is pushed to the predetermined loading completion position shown in FIG.
7 positions the cassette 12, and the drive shafts 73, 74 engage the hubs of the supply and take-up reels 13, 14 exposed at the bottom of the cassette 12. At the same time, the guard panel 15 has also been rotated to the position shown in FIG. Note that the liquid crystal display panel 11 is erected to a predetermined angle as shown in FIG.

After completing the loading of the cassette 12 in this way, when a predetermined key input is performed on the keyboard 10,
The motor 88 is driven via the control unit 71, and the interlocking gear 91 rotates clockwise in FIG. As a result, the gear arm 94 rotates to the right, and the oscillating gear 95, which is rotating counterclockwise, meshes with the reel gear 76, causing it to rotate clockwise. As a result, the take-up reel 14 in the cassette 12 is driven, and the magnetic tape 21 connected to the microfilm 20 is wound up. At this time, the supply reel 13 rotates in a driven manner, but the reel gear 75 also rotates clockwise, so a load is applied to the supply reel 13 via the driven gear 80 and the brake gear 83. .

While the magnetic tape 21 is being transported, information is read by the magnetic head 140 (FIG. 7) and this information is stored in a memory provided in the control unit 71. The information recorded on the magnetic tape 21 includes the number of frames of images recorded on the microfilm 20, table of contents information that compares the type and content of images with frame numbers, and the like. The information thus read is then displayed on the liquid crystal display panel 11. When the transfer of the magnetic tape 21 is completed, the motor 88 is automatically stopped and the preparation operation is completed.

When a predetermined film frame to be searched for is entered on the keyboard according to the table of contents information displayed on the liquid crystal display panel 11, the motor 88 is driven by the control unit 71. Then, the blip mark 20 written on the microfilm 20
When a predetermined film frame is searched while counting a by the photosensor 142 (FIG. 7), the motor 88 automatically stops, and after the pressure plate glass 30 presses the microfilm 20 to a predetermined position, the lamp 2
3 lights up, and the image recorded on the target film frame is projected onto the screen 5.
Note that while the microfilm 20 is being transferred, the pressure plate 30 is placed in a retracted position.

When the use of the cassette 12 is finished, a key input is performed to take out the cassette. As a result, the motor 88 is first driven, and all of the microfilm 20 and magnetic tape 21 are rewound to the supply reel side. During this rewinding, the oscillating gear 95 meshes with the reel gear 75 on the supply side while rotating clockwise, and the reel gear 75 is driven by the driving force of the motor 88. Further, the reel gear 76 rotates the take-up reel 1 due to the tension of the film.
4, the brake gear 84 acts to apply an appropriate tension to the film, making it possible to maintain stable film feeding.

When the microfilm 20 and magnetic tape 21 are all rewound onto the supply reel 13, the solenoid 106 is activated. As a result, the foot lever 105 is rotated to the position shown in FIG.
102 pops up. This results in
The used cassette 12 can be taken out. In order to facilitate the ejection of the cassette 12, it is preferable to provide a cassette ejector such as that used in video decks and the like.

When carrying the microfilm reader after use, the screen frame 7 is pushed down. As a result, the mirror 35 is folded up via the screen arm 52 and the mirror arm 47, and the top lid 2 is also folded up via the guide groove 58 and the pin 61 protruding from the screen frame 7. Further, the light shielding plates 8 are also stored while being overlapped. Then, after pressing down the screen frame 7 by an appropriate amount, close the top lid 2, and engage the hook 4 with the locking part of the case body 1, so that the first
This is the state shown in the figure.

[Effect of idea]

As explained above, according to the portable microfilm reader of the present invention, the braking means is connected to each reel gear connected to the drive shaft that engages with the reel via a one-way clutch. The brake is applied only to one reel that is driven by the tension of the film during feeding, and the brake is not applied to the reel driven by the motor. Therefore,
The film can now be fed under a constant tension without unnecessarily increasing the motor load, eliminating film flapping, maintaining a stable film feeding speed, and increasing the reliability of film feeding. can improve sex.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing a microfilm reader using the present invention when not in use. FIG. 2 is an external perspective view showing the microfilm reader shown in FIG. 1 in use. Figure 3 A and B are
FIG. 3 is a perspective view of the cassette with the guard panel closed and opened, respectively. FIG. 4 is a perspective view of the cassette holder in a popped-up state. FIG. 5 is a sectional view of essential parts showing a projection optical system and a structure for raising and lowering a screen of a microfilm reader using the present invention. FIG. 6 is a sectional view of a main part showing a state in which the screen is laid down. FIG. 7 is a cutaway plan view of essential parts of a microfilm reader using the present invention. FIG. 8 is a sectional view of essential parts of the reel gear and brake gear. FIG. 9 is a side view of the main parts showing the cassette holder in a popped-up state. FIG. 10 is a side view of the main part showing the cassette holder locked in the loading completion position. 1...Reader body, 2...Top lid, 5...Screen, 7...Screen frame, 8...Shading plate, 10
... Keyboard, 11 ... Liquid crystal display panel, 12
...Cassette, 15...Guard panel, 16...
Lock release button, 23... Lamp, 25... Cold mirror, 32... Projection lens, 35... Mirror, 37... Mirror frame, 47... Mirror arm, 52... Screen arm, 73, 74...
Drive shaft, 75, 76... Reel gear, 80, 81
... Driven gear, 88 ... Motor, 94 ... Gear arm, 95 ... Swing gear, 100 ... Cassette holder.

Claims (1)

[Claims for Utility Model Registration] A portable microfilm reader that selectively drives two reels rotatably built into a cassette to wind and unwind microfilm between these reels. , two reel gears to which drive shafts that engage with each of the reels are fixed, and an interlocking gear driven by a motor, which is coaxially mounted, and extends to a certain position where it abuts a stopper in accordance with the rotational direction of the motor. a swinging arm; a swinging gear that is pivotally attached to the tip of the arm and rotates by meshing with the interlocking gear, and meshing with either one of the reel gears to rotate the reel gear depending on the swinging direction of the arm; two driven gears connected to each of the reel gears via a one-way clutch, which are disconnected from each other when each reel rotates in the microfilm winding direction, and rotate in conjunction when the respective reel rotates in the feeding direction; A portable microfilm reader characterized by comprising two brake gears meshed with these driven gears, and a load supply means for applying a load to the rotation of these brake gears.