JPH0348574Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) This invention relates to a microfilm reader printer.

(Prior Art) A microfilm having a function of displaying an enlarged image of a microfilm illuminated by an illumination means on a screen, and a function of enlarging and projecting the image onto a photoreceptor as necessary to make copies. Film reader printers are known.

In such microfilm reader printers, the same imaging lens is used both for displaying the microfilm image on the screen and for copying, so the exposure mirror is generally made swingable so that the image on the screen is When displaying an image, the exposure mirror is moved away from the imaging light beam, and when copying is performed, the exposure mirror is raised by rotation and placed in the imaging light beam.
However, when copying, when the exposure mirror is positioned in the imaging light beam, there is a problem in that light from the outside that passes through the screen enters the exposure mirror, becomes stray light, and adversely affects copying. Furthermore, the exposure mirror positioning means and the light shielding means are constructed separately, resulting in a complicated construction and high cost.

(Purpose) The present invention was developed in view of the above-mentioned problems, and its purpose is to:
To provide a microfilm reader printer which can effectively prevent external light from the screen side from entering an exposure mirror and can easily position the exposure mirror during exposure.

(composition) The present invention will be explained below.

The microfilm reader printer of the present invention comprises: an exposure means for enlarging and projecting a microfilm image; a screen disposed above the exposure means for displaying the enlarged and projected image; a projection mirror for reflecting an image projected from the exposure means; a first function for displaying an enlarged image of the microfilm irradiated by the exposure means on a screen reflected by the projection mirror; The microfilm reader printer has a second function of forming an image irradiated by the exposure means on a photoreceptor and copying the image, and includes an exposure mirror, a light shielding plate,
It has a groove cam.

The exposure mirror is rotatably supported at one end by the reader printer main body, and is positioned between the exposure means and the projection mirror during the second function to reflect the image irradiated by the exposure means. At the same time, when the first function is performed, it is retreated to a position where it does not interfere with the imaging light beam from the exposure means.

A light shielding plate is provided at the other free end of the exposure mirror.
The grooved cam is provided so as to be swingable, and the grooved cam engages with a roller provided on the other end side of the light shielding plate, and guides the movement of the light shielding plate when the exposure mirror swings.

The light shielding plate is positioned so as to block external light coming through the screen from the exposure mirror when the second function is performed, and is folded with the exposure mirror when the first function is performed. To position.

Hereinafter, description will be given based on specific examples.

FIG. 2 is a front view of this embodiment, FIG. 3 is a side view, FIG. 4 is a diagram showing the main parts of the slit exposure optical device, and FIG. 1 is a diagram for explaining the features of the present invention. As shown in FIG.
When the vertical shift knob 17 is rotated, the base plate 98, which is mounted so as to be slidable in the vertical direction in FIG. The film pressure plate 100 is configured to be slidable in the left-right direction in FIG. 2 by the rotation operation of 18. The film pressure plate 100 can be attached to and removed from the base plate 98 in the vertical direction in FIG. 2, so that film pressure plates corresponding to various film types can be replaced and attached. The film pressure plate 100 is configured so that the microfilm 181 is held between a pair of flat glass plates by the biasing force of a spring (not shown).

First, referring to FIG. 3, when no copying is being performed, the image on the microfilm 181 held in the film holder 14 is illuminated by the illumination optical system 13, and is transmitted through a plurality of projection lenses 47, 48, etc. to a magnification change knob. 16 (see FIG. 2), is reflected by the projection mirror 42 attached to the screen housing unit 2, and is projected and displayed on the screen 6 (the first function).

As shown in FIG.
5 focuses on the screen 6, and its position is
The position of the microfilm is moved and adjusted using the vertical shift knob 17 and the left and right shift knobs 18. To obtain an enlarged copy of the microfilm image on the screen 6, align the enlarged image with the copy size mark 7 on the screen 6, select the desired paper using the copy size selection switch 8, and turn the exposure adjustment knob 10.
Adjust the exposure amount with , set the number of copies with copy number set switch 11, and then
2 starts the copying operation.

The microfilm image held stationary by the film holder 14 is enlarged and projected by a projection lens 47, and is exposed to an exposure mirror 19 (see FIG. 1, hereinafter referred to as the first exposure mirror), a second exposure mirror 20, and a third exposure mirror. 21 onto the photoreceptor 23 (see Fig. 2), and the illumination is carried out so that the enlarged image moves in synchronization with the drum-shaped photoreceptor 23, which is rotated at a constant speed in the direction of the arrow. The optical system 13 and the projection lens 47 integrally scan and move, and an enlarged latent image of the microfilm is formed on the photoreceptor 23, which is uniformly charged by the static eliminating charger 27.
The toner image developed by the developing unit 24 is fed by the paper feeding unit 28, transferred by the transfer separation charger 25 onto a transfer paper 35 cut into a predetermined length by the cutter unit 29, and separated from the photoreceptor 23. The transferred transfer paper 35 passes through the separation and conveyance unit 30, has the toner image fixed thereon by the fixing unit 31, and is discharged onto the paper discharge tray 32 (second function).

The process of these electrophotographic copying apparatuses is such that after the visible image is transferred, residual toner is removed from the photoreceptor 23 by a cleaning unit 26, and residual static electricity is also removed by a neutralizing charger 27, and the photoreceptor is uniformly charged again to proceed to the next copying step. This is a general description and detailed explanation will be omitted.

As shown in FIG. 4, the illumination optical system 13 includes a light source lamp 93 as a light source, a spherical mirror 94, and a condensing lens group 95, and is guided by shafts 91 and 92 on a base plate 61 in the direction of the arrow. It is attached so that it can be slid and moved. The spherical mirror 94 and the condensing lens group 95 constitute a condensing means. Illumination optical system 1
3 in the optical axis direction is moved and positioned in conjunction with the rotation of the turret plate 46 in accordance with the selected projection magnification, and the illuminance on the photoreceptor 23 in the rotation axis direction is adjusted. are adjusted so that they are uniform.

A plurality of projection lenses 47, 4 are mounted on the turret plate 46.
The 8th magnification is screwed in and selected according to the magnification, but it is adjusted by attaching a balance weight so that the weight when each projection lens is attached is almost constant. .

Illumination optical system 13, multiple projection lenses 47, 48
The underframe 61 is equipped with a turret plate 46 screwed with ... so that their optical axes coincide, one side is attached to the main axis 6.
4 is slidably supported by bearings 62 and 63, and the other is supported in contact with an auxiliary shaft 65 by a roller 68 rotatably supported by an underframe 61 as shown in FIG. 64 is given the habit of moving to the left in FIG.
The position is controlled by the contact between the convex portion 71 of the underframe 61 and the convex portion 71 of the underframe 61.

The male screw 73 is supported by a set of bearings 80 mounted on a stationary member in such a manner that it slides in the axial direction but does not rotate, and is supported in a manner that it can rotate but does not move in the axial direction by a set of bearings 81. It is supported in a fixed manner and is threadedly engaged with a female screw 74.

A pulley is formed on the outer periphery of the female thread 74,
It is rotationally driven by a pulse motor 77 via a pulley 76 and a belt 75. That is, in this embodiment, the main shaft 64, the rollers 68, the auxiliary shaft 65,
Spring 69, male thread 73, female thread 74, pulley 7
6, belt 75, pulse motor 77, etc. constitute a displacement means.

An encoder disc 78 having one slit with a width of approximately 0.1 mm is attached to the output shaft of the pulse motor 77 so that a signal is generated by a photo sensor 79.

A photo interrupter 83 mounted on the underframe 61 has a slit with a width of about 0.1 mm so as to output a signal to a photo sensor 84.

As mentioned above, the microfilm image is transferred to the screen 6.
When the image is enlarged and projected for observation, the photo sensors 79 and 84 are in a state where signals are emitted by the slits of the encoder disk 78 and the slit of the photo interrupter 83, respectively, and in this mode, the projection lens 47 so that the projection optical axis and the center of the screen 6 coincide with each other.
9. Encoder disc 78 and photo sensor 8
4. The position of the photo interrupter 83 has been adjusted, and a signal indicating that the underframe 61 is at the reference position is sent to the control circuit.

The movement of the underframe 61 in the left and right direction in FIG.
6 and 85, respectively, but in this operating mode, the photo interrupter 83 does not separate from the photo sensor 84.

Therefore, if the underframe 61 is not in the reference position, the pulse motor 77 is biased to rotate either to the right or left, and the pulse motor 77 is activated by the signal from the underframe 61 that activates either the limit switch 85 or 86. Motor 77 is urged to rotate in the opposite direction. Due to this bias, the underframe 61 and therefore the photo interrupter 83 move in the opposite direction, and the photo sensor 84 detects the slit on the photo interrupter 83, and while this detection signal is being generated, the encoder disc 78
When the upper slit is detected by the photo sensor 79, the pulse motor 77 is deenergized and the underframe 61 is positioned at the reference position.

That is, the range in which the slit of the photo interrupter 83 is detected by the photo sensor 84 is smaller than the amount of movement of the underframe 61 by one rotation of the encoder disk 78, and the slit of the encoder disk 78 is only one slit on the encoder disk 78. As mentioned above, the width is as small as about 0.1mm, so the underframe 6
The positioning signal for one reference position is generated with extremely high accuracy.

Hereinafter, the exposure and scanning process of the enlarged and projected microfilm image will be explained.

First, the light source lamp 93 of the illumination optical system 13 is activated by the activation signal of the print switch 12 (Fig. 2).
(see FIG. 4), the turret plate 46 to which the projection lens 47 is screwed and the underframe 61 to which the illumination optical system 13 is attached are moved by an amount corresponding to the selected copy magnification and copy size. pulse motor 77
Due to the movement of the male screw 73 and the pressure of the spring 69, it moves to the left in FIG.

Due to this movement, the illumination optical system 13 and the projection lens 47 are integrally moved to the position C, as shown in FIG. 6 (FIG. 6 is an explanatory diagram showing the exposure optical system developed in the optical axis direction.) Move from ′C to a position slightly to the left of S′S. At this time, as shown in FIG.
As the constant angular velocity cam 148 rotates in the direction of the arrow, the follower lever 143, which is rotatably supported on the shaft 136, is urged to rotate clockwise via the rollers 146.

A tension spring 145 is tensioned between the stud 144 of the follower lever 143 and the stud 142 of the lever 140, which is secured to the shaft 136 by a pin 141, so that the follower lever 143 and the lever 140 are urged to rotate in a direction in which they attract each other. lever 140
The protrusion 140a and the follower lever 143 are in contact with each other.

A pin 139 is fixed to the shaft 136 and engages with an engagement hole 138 in the base plate 121 which is rotatably supported on the shaft 136 by a support arm 137.
The clockwise rotation of the follower lever 143 due to the clockwise rotation of the lever 140 causes the lever 140 to rotate clockwise via the tension spring 145, and this rotation causes the pin 141 to rotate the shaft 136 clockwise. ,
The base plate 121 is rotated clockwise around the shaft 136 via the pin 139 .

A shaft 124 is provided at the other end 123 of the base plate 121, and a bracket 125 is rotatably supported on the shaft 124, and a light shielding plate 126 is rotatably supported at one end on a shaft 127. A roller 129 is rotatably supported on the other end 128 of the light shielding plate 126.
The roller 129 is connected to the guide groove 13 of the left and right grooved cam plates 130, 130a screwed to the left and right plates 66, 67.
1,131a so as to be slidably movable.

Further, the light shielding plate 126 is biased to rotate clockwise around the shaft 124 by a torsion spring 122, but this bias is applied to the first exposure mirror 19 and the base plate 12.
The weight of the base plate 121 is such that it does not prevent the base plate 121 from rotating counterclockwise.

When the base plate 121 is rotated clockwise, the light shielding plate 126 is rotated clockwise around the shaft 124 as shown in FIG. 1 from the state shown in FIG. , 131a, and when the follower lever 143 is further rotated by the constant angular velocity cam 148, the follower lever 143 and the lever 14
The projections 140a of 0 are separated, and the tension spring 145
is further biased, the lever 140 is further biased to rotate clockwise, and the base plate 121 is also pulled by the tension spring 14.
5 to rotate clockwise.

This bias and the guide grooves 131 and 13 of the rollers 129
By engaging with one end of 1a, the base plate 121 and therefore the first exposure mirror 19 transfer the enlarged projected image of the microfilm to the second and third exposure mirrors 20 and 21.
(See FIG. 2), the image is positioned at a position where the image is projected onto the photoreceptor 23.

The position of the first exposure mirror 19 in the projection mode on the photoconductor 23 is adjusted by rotating the grooved cam plates 130, 130a around the setscrews 133, 133a, and the position is fixed with the setscrews 134, 134a. This makes it adjustable. Exposure first mirror 1
In the projection mode shown in FIG. 9 onto the photoreceptor 23, the constant angular velocity cam 148 operates the micro switch 157 to deenergize the motor 147.

When the base plate 121 and the light shielding plate 126 are positioned in the state shown in FIG. This prevents the light from reaching the second exposure mirror 20 and the third exposure mirror 21 from the opening 135a of the shielding plate 135. In particular, the light shielding plate 126 prevents external light from entering the first exposure mirror.

A shutter plate 149 is rotatably supported on the shielding plate 135 so as to cover or open the opening of the shielding plate 135, and the rotation is controlled by the rotary solenoid 1.
56.

As shown in FIG. 2, a shielding plate 151 is provided at the bottom of the optical unit 4, and a slit plate 152 and a rotating slit plate 153 are screwed into the opening of the projection optical path near the photoreceptor 23. The projected light flux is regulated.

Furthermore, a paper width light shielding unit 22 is arranged near this, and as shown in FIG.
Three types of paper width light-shielding plates 171, 172, and 173 rotatably supported by 55 are arranged radially, and the selected copy size (A2Y, A3T),
Paper width light-shielding plates corresponding to (A3Y, A4T) and (A4Y) are selectively positioned.

That is, the paper width light shielding plates 171, 172, 173 have their supporting shafts 170 connected to the pulley 179, the belt 175,
It is rotatably driven in one direction by a pulse motor 176 via a pulley 174, and its rotary/stop position is determined by an interrupter 177 attached to a support shaft.
It is designed to be controlled by a signal from a photo sensor 178.

This operation is performed by selecting the copy size selection switch 8 on the control panel 3 (FIG. 2).

When the first exposure mirror 19 (see FIG. 1) is located at the exposure projection position, the underframe 61 is positioned at the run-up start position for exposure scanning, and the light source lamp 95 is turned on, the paper feed unit shown in FIG. A pulse motor 77 (FIG. 4) is sent via a control circuit from a signal detected at the leading edge of the transfer paper 35 by the photo sensor 34 in the photo sensor 28 (see FIG. 4).
is energized to rotate, and the rotation speed corresponds to the selected magnification factor. When the enlarged image of the microfilm reaches the exposure start point on the photoreceptor 23, the optical axis of the projection lens 47 is set at the point S in FIG. It is located at
Slit exposure is started at a speed corresponding to the selected magnification, and at the same time, the rotary solenoid 156 (FIG. 1) is energized and the shutter plate 14 is energized.
9 retreats from the optical path.

The projection lens 47 and the illumination optical system 13 are integrated,
When moved by an amount corresponding to the selected magnification and copy size, the optical axis of the projection lens 47 reaches position E in FIG. 6. At this point, the rotary solenoid 156 is deenergized and the shutter plate 149 blocks the optical path. Then, the light source lamp 93 is deenergized.

The scanning exposure mode described above was taken as an example when the predetermined enlarged image of the microfilm and the selected copy size match, but it is also possible to select a copy size larger than the enlarged image, and in this case, the microfilm The size of is the scanning movement amount (SL in Figure 6) as 1/m of the enlargement magnification of the copy size.
There is no need to explain that it is controlled. In response to a signal indicating that the projection lens 47 has reached the position E in FIG. 6, the pulse motor 77 is urged to rotate so that the underframe 61 moves to the left in FIG.

When the required number of copies is one by selecting the number of copies set switch 11, the fourth
Photo sensor 84, photo interrupter 83, photo sensor 79, and encoder disk 7 shown in the figure
8, the underframe 61 returns to the reference position, and at the same time, the motor 147 shown in FIG. .

As the constant angular velocity cam 148 is displaced in this manner, the follower lever 143 begins to rotate counterclockwise and comes into contact with the protrusion 140a of the lever 140. As the rotation continues, the shaft 136 and therefore the base plate 121 also rotate. It begins to rotate counterclockwise.

This rotation causes the light shielding plate 126 to move into the guide groove 131,
The uniform angular velocity cam 148 rotates counterclockwise around the shaft 124 while being guided by the roller 129 slidingly engaged with the roller 131a.
In the position where 8 is activated, the base plate 121 and the light shielding plate 1
26 is projected by a projection lens 47 as shown in FIG.
It is evacuated to a position away from the enlarged projection optical path projected onto the screen 6.

A signal indicating that the underframe 61 has returned to the reference position turns on the light source lamp 93, and the microfilm image is enlarged and projected onto the screen 6.

When obtaining a plurality of copies using the copy number setting switch 11, the shutter plate 149 (FIG. 1) is moved from the shielding plate 135 by moving the underframe 61 as described above at the end of scanning exposure of the microfilm.
In FIG. 4, the underframe 61 covers the opening 135a of the
moving the external screw 73 by rotating the pulse motor 77 so that the optical axis of the projection lens 47 is located to the left of the S position in FIG.
The position is determined by the pressure of the spring 69.

The rotation of the pulse motor 77 for this positioning is controlled by the reference position passage signal of the underframe 61 from the photo sensor 84, the photo interrupter 83, the photo sensor 79, and the encoder disk 78, as described above. Positional accuracy has become extremely high.

In FIG. 2, a pulse motor 77 shown in FIG.
is rotationally energized, the underframe 61 moves at a predetermined speed, starts exposure scanning again, and when the same operation as described above in which the shutter plate 149 is retracted is repeated a predetermined number of times, the shutter plate 149 and the exposure first mirror 19;
The underframe 61 and the light source lamp 93 return to the state of projecting the microfilm image onto the screen 6.

Note that during this operating state for obtaining a plurality of copies, the light source lamp 93 is turned on at a brightness adjusted by the exposure adjustment knob 10 (see FIG. 2).

Further, in the microfilm reader printer of this embodiment, the screen housing unit 2 is opened to the optical unit 4 as shown in FIG. Below, screen housing unit 2
The opening and closing of the optical unit 4 will be briefly explained.

In FIG. 5, the screen housing unit 2
has a screen 6, a projection mirror 42, and a bracket 41 for holding the same.

The screen housing unit 2 is the optical unit 4.
(see Fig. 2) side plates 66, 67 (see Fig. 4)
As shown in FIG. 5, the screen 6 is supported by a pin 167, and the lower side portion of the screen 6 can be screwed to the side plates 66, 67 by screws not shown. As shown in FIG. 3, when the screen housing unit 2 is closed, the lower end of the screen 6 side of the unit 2 is screwed to the side plates 66, 67 as described above. A contact portion is provided at the bottom of the screen housing unit 2 to abut against the upper ends of the side plates 66 and 67 to maintain the relative positions of the screen housing unit 2 and the optical unit 4.

On one side wall of the screen housing unit 2,
As shown in FIG. 6, a guide plate 1 having a groove 162
A stay 164 with one end 166 pivotally supported is provided on the side plate 66 of the optical unit 4. The other end 165 of this stay 164 engages with the groove 162 of the guide plate 161, and the stay 164 has one end 166 pivotally supported. 162 so as to be slidable. When the above screws are removed and the front side of the screen housing unit 2 is lifted up, the screen housing unit 2 rotates clockwise around the pin 167 relative to the optical unit 4 and opens. At the corner, as shown in FIG. 5, the tip 165 of the stay 164 is
1 by engaging the locking portion 165 in the groove 162 of the first groove. In the state shown in FIG. 5, the center of gravity of the screen casing unit 2 is located on the right side of the vertical line passing through the pin 167 (vertical direction in FIG. 5). Therefore, the screen casing unit 2 is in the state shown in FIG. You can stand still.

Also, a base plate 12 that holds the first exposure mirror 19 is provided.
1, by manual operation, the roller 129 pivotally supported by the light shielding plate 126 is detached from the notch grooves 132, 132a of the guide grooves 131, 131a, and the optical unit 4 is removed.
Rotate and separate from. This base plate 121, light shielding plate 12
6 also stands still in the state shown in FIG. 5 because the center of gravity is located on the right side of the vertical line passing through the axis 136. Also in this state,
The elastic force of the torsion spring 122 is set so that the light shielding plate 126 closes against the base plate 121 against the elastic force of the torsion spring 122 (FIG. 1).

In this way, by making the screen housing unit 2, the first exposure mirror 19, and the light shielding plate 126 openable and closable with respect to the optical unit 4, cleaning, maintenance, repair, etc. of the optical system components in the optical unit 4 are made extremely easy. It can be made easy and safe. To return the state shown in FIG. 5 to the state shown in FIG. 3, first manually return the first exposure mirror to the state shown in FIG. All you have to do is close it and secure it with the specified screws.

(Effects) As described above, according to the present invention, a novel microfilm reader printer can be provided.

Since this microfilm reader printer is constructed as described above, when copying an image on a microfilm, it is possible to effectively prevent external light from the screen side from adversely affecting the copying as stray light. Further, positioning of the first exposure mirror during exposure mode can be realized reliably and easily.

[Brief explanation of the drawing]

FIG. 1 is an explanatory front view showing one embodiment of the present invention, FIG. 2 is an explanatory front view of the above embodiment, FIG. 3 is an explanatory side view of the above embodiment, and FIG. is a diagram to explain the movement of the illumination optical system and lens during slit exposure, Figure 5 is a diagram to explain the state in which the top of the apparatus is open, and Figure 6 is a diagram to explain slit exposure. be. 19... Exposure first mirror, 126... Light shielding plate,
130... Groove cam plate, 122... Torsion spring.

Claims (1)

[Claims for Utility Model Registration] Exposure means for enlarging and projecting a microfilm image, a screen disposed above the exposure means for displaying the enlarged and projected image, and the above-mentioned exposure means disposed at a position opposite to the screen. a projection mirror that reflects an image projected from the exposure means, a first function of reflecting an image of the microfilm irradiated by the exposure means on the projection mirror, enlarging and projecting it on a screen, and displaying the image on the screen; In a microfilm reader printer having a second function of forming an image irradiated by a means on a photoreceptor and copying the image, one end is rotatably supported on the reader printer main body, and the second function is When in the first function, it is located between the exposure means and the projection mirror, and reflects the image irradiated by the exposure means to form an image on the photoreceptor, and when in the first function, it is located between the exposure means and the projection mirror. An exposure mirror that is retracted to a position where it does not interfere with the imaging light beam, a light shielding plate that is swingably provided at the other free end of the exposure mirror, and a roller that is provided at the other end of the light shielding plate. and a grooved cam that guides the movement of the light-shielding plate when the exposure mirror swings, and the light-shielding plate blocks external light entering through the screen when in the second function. A microfilm reader printer, characterized in that the microfilm reader printer is positioned so as to be shielded from light with respect to the exposure mirror, and is positioned so as to be folded with the exposure mirror during the first function.