JPH0652372B2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the invention [Industrial field of application] The present invention projects a negative image recorded on a microfilm onto a moving photoconductor through a slit and makes a copy thereof by reversal development. Get printer related.

[Conventional technology]

Generally, the image recorded on the microfilm is almost a negative image, and a so-called reversal development type electrophotographic copying method is used to obtain a copy of the positive image from the negative image.

On the other hand, in a negative film microfilm, generally, as shown in FIG. 6, a negative image is recorded in the frame 1 of the microfilm F, and the periphery of each frame is transparent. An opaque search mark 2 and a frame number 3 are recorded respectively.

In general, in a reader printer using a microfilm, an area larger than one frame of the microfilm is projected on the photoconductor, so that the transparent periphery is also exposed and the charge on the photoconductor is lost.

Therefore, toner is attached to the peripheral area by the reversal development, a so-called black frame is recorded around the image on the photoconductor, and the search mark 2 and the frame number 3 are recorded in the black frame. There is a problem that the appearance is poor, the commercial value of the copy product is reduced, and the consumption of toner is increased in the case of electrophotographic copying.

In order to solve this problem, there is a method in which a plate-shaped light-shielding member is moved / stopped to a predetermined position by a signal from a light amount sensor that detects a region boundary of an image frame to shield the outside of the image region. Being tried.

[Problems to be solved by the invention]

However, a large force is required to move the plate-shaped light-shielding plate, and the moving speed of the light-shielding plate is slow, so that it takes time to shield light. On the other hand, in order to move at a high speed, a driving device having a large load capacity must be used, which causes a problem that power consumption and device cost increase.

It is an object of the present invention to provide a printer that solves the above problems.

B. Structure of the Invention [Means for Solving the Problems] The present invention provides a reader printer in which a negative image recorded on a microfilm is projected on a moving photoconductor through a slit and a copy thereof is obtained by reversal development. A sheet-shaped light-shielding member wound around a reel so that it can be sent out and wound in a direction orthogonal to the moving direction of the photoconductor, and a light amount sensor provided in the projection optical path so as to detect the area boundary of the image frame A reader printer characterized in that the light amount sensor is configured to move / stop the sheet-shaped light-shielding member to a predetermined position in response to a signal detecting a region boundary of an image frame to shield light outside the region of the image frame. Is.

[Work]

The sheet-shaped light-shielding member wound around the reel is sent out orthogonally to the moving direction of the photoconductor, and is wound up to shield the outside of the image frame area.Therefore, when a negative image is copied by the reversal development method, a black frame appears. It can be reliably prevented from being formed, and since the light shielding member is sheet-shaped, it can be moved at high speed with a small driving force.

〔Example〕

FIG. 1 shows the outline of a reader / printer of the present invention, in which a microfilm F is illuminated by an illumination means composed of a lamp L, a spherical mirror 4 and a condenser lens 5, and the illuminated image shows a projection lens 6 and mirrors 7 to 10. It is projected on the screen 11 at a predetermined magnification by the lens 6 by the optical system of the reader unit. In this case, the scan mirrors 12 and 13 for the printer are moved in the direction of arrow W to a position where the projection optical path a to the screen is not blocked.

When copying a microfilm image, first, as shown in the figure, the mirror 12 is placed on the optical path between the mirrors 8 and 9.
Insert. Next, the mirror 12 and the mirror 13 are integrally formed, and the peripheral speed of a drum-shaped photoconductor (hereinafter, referred to as a photoconductor drum) 15 that is rotatably supported in the arrow direction is half the peripheral speed.
Is moved in the direction of arrow W by a driving device (not shown) to scan the image light of the microfilm on the mirror 8. The scanning image light is projected onto the exposure position of the photosensitive drum 15 through the slits 14 of the slit plate 23 via the mirrors 12 and 13.

Around the photosensitive drum 15, a charging device, a developing device, a transfer device, and a cleaning device, which are not shown, are provided, and a copy can be obtained by a known process.

The above is a known configuration, and the present invention is an improvement of the light shielding mechanism of the slit 14. FIG. 2 is a perspective view showing the light shielding mechanism, and FIG. 3 is a drive for moving the sheet-shaped light shielding member (light shielding sheet). It is a front view of a part. In FIGS. 2 and 3, a pair of light shielding sheets 17a and 17b is provided in front of the slit 14.
Along the rail 18 in the direction perpendicular to the projection optical path b and in the axial direction of the photosensitive drum 15, that is, the photosensitive drum 1
It is arranged so as to be movable in a direction orthogonal to the rotation of 5.

The light shielding sheets 17a and 17b have the same structure, and the light shielding sheet 17a will be described below. The light shielding sheet 17a is wound around the reel 31, and the reel 31
The shaft of the one-way clutch 3 rotates in the direction of arrow 41.
2. The one-way clutch 32 is interlocked with a motor gear 34 that rotates in the direction of arrow 40 via a gear 50 provided on the outer peripheral portion of the one-way clutch 32.
It is interlocked with the sheet feeding roller 37 via.

The number of teeth of the gear 35 is set larger than the number of teeth of the gear 50. A photo sensor 38 is arranged at a predetermined position so as to face a moving track of the hole 39a provided in the light shielding sheet 17a in the drum axis direction.

Since the slit light shielding mechanism has the above-mentioned configuration, the first
After reading the image on screen 11 as shown,
When switching to print and pressing the print button, the mirrors 12 and 13 perform forward scanning in the direction of arrow R, and the photosensitive drum 15
To be exposed.

In this exposure state, the light amount sensor 30 in which the light receiving elements are arranged in one row in parallel with the slit 14 detects the light amount in the vicinity of the slit 14, and the light receiving amount existing in the axial direction of the photosensitive drum 15 is largely different. When a boundary detection signal indicating (the boundary position of the black frame in the axial direction of the photosensitive drum 15) is output, the motor 33 is rotated in the direction of arrow 40 by this boundary detection signal. As a result, the sheet feeding roller 37 is driven by the motor 33 via the gears 34 and 35 to feed the light shielding sheet 17a toward the center of the slit 14, that is, toward the inner side, and the amount of light received in the axial direction of the photosensitive drum 15 is large. Stop at a different position.

Next, the mirrors 12 and 13 are returned to the direction of the arrow W to perform a normal copying operation. The transparent portion of the microfilm F outside the image area boundary in the axial direction of the photosensitive drum 15 is shielded by the light shielding plate 17a. Since it is not exposed, the cause of the black frame of the copy image is eliminated.

After the exposure, the motor 33 rotates in the direction opposite to the arrow 40,
The light-shielding sheet 17a is wound by the interlocking operation of the gear 50 and the gear 35 with the intervention of the gear 34. At that time, due to the difference in the number of teeth of the gear 50 and the gear 35, the reel 31 rotates faster than the sheet feeding roller 37, so that the sheet feeding roller 37 and the light shielding sheet 17 a rub and the light shielding sheet 17
It eliminates the occurrence of slack when a is wound on the reel 31.

When the light shielding sheet 17a is wound up to a position where it does not shield the slit 14, the photo sensor 38 detects the hole 39a,
The motor 33 is stopped by the detection signal to stop the rotation of the reel 31.

Further, instead of the photo sensor 38 and the hole 39a, the encoder 42 is replaced by the one-way clutch 32 as shown in FIG.
It may be arranged on the axis of and to detect the moving distance of the light shielding sheet 17a.

Although only the operation of the light shielding sheet 17a has been described above, the light shielding sheet 17a and the light shielding sheet 17b operate independently according to the boundary detection signal detected by the light amount sensor 30. Further, although the drum-shaped photosensitive member is shown in the embodiment, a sheet-shaped photosensitive member that is transported in one direction may be used.

Since the sequence control of the above sequential operation is performed by a known means, its details are omitted.

An area (transparent portions on the left and right of the frame in FIG. 6) unnecessary for copying the microfilm in the rotation direction of the photosensitive drum is opened and closed with respect to the photosensitive drum by opening and closing a movable light shielding plate 23a that moves in the circumferential direction of the photosensitive drum 15. By controlling the exposure start timing and the exposure end timing, it is possible to prevent the exposure.

FIG. 5 shows the photo sensor 38 and the hole 39 in FIG.
Instead of a, protrusions 51a and 51b are provided at the tips of the light shielding sheets 17a and 17b, and the protrusions 51a and 51b move the operating arm of the switch 52 (the switch for the protrusion 51b is not shown), and the switch 52 is used for switching. The winding of the reel 31 is stopped, and the light-shielding sheet 17 becomes excessive.
This is to prevent the a. 17b from being wound around the reel 31 (the reel for the light shielding sheet 17b is not shown).

In the embodiment, as shown in FIG. 2, as a driving force transmitting means of a mechanism for winding and sending out the light shielding sheet 17a,
Although the gear 50, the motor gear 34, and the gear 35 are used, the driving force transmitting means may be a belt.

C. Effect of the Invention Since the present invention is configured as described above, the light transmitted through the transparent portion around the negative image of the microfilm is not projected on the photoconductor, so that the negative image is copied by the reversal development method. It is possible to obtain a copy of a positive image with high commercial value without forming a black frame on the. Further, since the light blocking member is in the form of a sheet, the load for moving the light blocking member is small and the light blocking member can be moved at high speed. Simple to configure.

When moving the light shielding sheet to pass or block light,
By winding the unnecessary portion in the light shielding sheet around the reel, there is an effect that the floor area required by the light shielding mode can be minimized.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a reader printer of the present invention, FIG. 2 is a perspective view of an essential part of the present invention, and FIG. 3 is a front view of a drive unit for moving a light shielding sheet, FIGS. FIG. 6 is a perspective view showing another embodiment for detecting the movement distance of the light shielding sheet,
The figure is a front view of the microfilm. F is a microfilm, 14 is a slit, 15 is a photoconductor (photosensitive drum), 17a and 17b are light-shielding sheets, 30 is a light amount sensor, 32 is a one-way clutch, and 37 is a sheet feeding roller.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Masaaki Yanagi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Yoshihiro Saito 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (72) Inventor Yoshihiko Yoshihara 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (1)

[Claims] 1. A printer, in which a negative image recorded on a microfilm is projected onto a moving photoconductor through a slit and a copy thereof is obtained by reversal development, which can be sent out and taken up in a direction orthogonal to the moving direction of the photoconductor. A sheet-shaped light-shielding member wound around the reel, a sheet feed roller in contact with the sheet-shaped light-shielding member wound around the reel, a one-way clutch capable of transmitting power to the rail shaft when the reel shaft rotates in the winding direction, A drive mechanism for driving the reel shaft and the sheet feed roller at the same time is provided, and the speed of the outer circumference of the sheet-shaped light shielding member wound on the reel by the rotation of the reel shaft is set to be higher than the speed of the outer circumference of the sheet feed roller. Therefore, when the sheet-shaped light-shielding member is fed and wound, a speed difference is created between the peripheral speeds of the sheet-feed roller and the reel so that the sheet-shaped light-shielding member is shielded. Printer, characterized in that the wound on the reel to wood.