JPS5977428A - Original exposing scanner of copying machine - Google Patents

Abstract

PURPOSE:To reduce a platen stroke during a scan on a book original and the necessary space for a device by putting a part of a guide and supply part for a sheet original off the movement path of the platen during the exposure scanning on the book original. CONSTITUTION:When the exposure scan on the book original is made, a platen cover 3 is opened to place the book original at a specific position of the platen 1 and then the platen cover 3 is closed. When a print start signal is generated, a solenoid 40 turns on to pull down a platen stopper 38, and its tip part is disengaged from the stopper hole 41 of a frame 2 to unlock the platen while pressing down a pin 37 by a lever 39. Consequently, a lower guide plate 12 rotates and a projection part from the hole 45 of the main frame cover 44 moves back away from the movement path for the platen. At this time, the tip bent part 30 of a gate plate 11 also moves away from it together. Thus, the stroke of the platen in book original scanning is reduced and the necessary space for the device is also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document moving type document exposure and scanning device used in a copying machine or the like.

Electrophotographic copying machines that are configured to enable exposure scanning by reciprocating a book document and by transporting a sheet document in one direction have been known for some time (for example, Japanese Patent Application Laid-Open No. 46-6078 Publication No. 123/1986
(See Publication No. 4).

However, in such a conventional device, the exposure scanning unit for sheet originals is provided at a separate position from the platen unit on which the book original is placed and exposed and scanned, and the exposure scanning optical system is located at a separate position from the platen unit on which the book original is placed and exposed and scanned. It is located below the scanning unit, and when scanning a sheet original, the sheet original is directly inserted from the platen on which the book original is placed into the exposure scanning unit of the sheet original, and the exposure scanning is performed. During exposure scanning, all or part of the exposure scanning section of the sheet document is integrated with the exposure scanning platen section of the book document, and the platen section is configured to reciprocate on the exposure scanning optical system.

In this way, the sheet and book original exposure scanning units are placed at different positions, and the exposure scanning optical system is placed below the sheet original exposure scanning unit, so when exposing and scanning book originals, the effective length of the platen is Also, a large movement stroke is required by the length corresponding to the distance between the front end of the platen and the position of the exposure scanning optical system.

This large stroke is a major drawback in making the copying machine compact and in reducing the space required for the copying machine. Furthermore, moving a fairly large platen and a sheet document exposure/scanning section over a large range is disadvantageous in terms of maintaining mechanical accuracy and durability.

Furthermore, since the sheet original is configured to be inserted into the sheet original exposure scanning section from the platen side for exposing and scanning the book original, there are drawbacks such as the difficulty of providing an alignment mechanism for the sheet original. was there.

The present invention has been made in order to eliminate the drawbacks of the above-mentioned prior art, by making it possible to use the platen for book originals in common for exposure scanning of sheet originals, and by reducing the movement stroke of the original platen during exposure scanning of book originals. In addition to reducing the space required for copying machines, when scanning book originals with exposure,
It is an object of the present invention to provide a document exposure device for a copying machine configured to move a part of a sheet document guide and supply section from a movement path of a document table by a simple operation, thereby making it possible to move the document table. be.

The present invention will be described in detail below based on Examples.

FIG. 1 is a schematic diagram of a document exposure and scanning device of a copying machine according to the present invention, FIG. 2 is an enlarged perspective view of a sheet document guide and supply section of the device shown in FIG. 1, and FIG. 3 is a sheet document same. FIG. 4 is a plan view of the guide supply section and a partially enlarged perspective view of the document guide supply section.

In these figures, 1 is a glass platen attached to a frame 2, and 3 is a platen cover also attached to the frame 2 so as to be openable and closable. Reference numeral 4 denotes a drive roller attached to the platen cover 3 and supplied with power from the copying machine main body 6 side by a transmission means (not shown); 4 is a driven roller that is supplied with power from the drive roller 4 via a conveyor belt 5; This is a driven roller. 6 is a guide provided on the end surface of the platen 1 on the sheet document supply side; 7 is an upper guide plate attached to the platen cover 5 adjacent to the guide 6; one end adjacent to the guide 6 has a number of notches; A portion 7' is formed. Further, a ball receiver 9 is provided in the center of the upper guide plate 7, and this ball receiver 9
A ball 8 is rotatably disposed therein and placed on an original supply roller 10 which is attached to the main body 16 and acts as an aligner for sheet originals. When a sheet original is supplied between the original supply roller 10 and the ball 8, the ball 8 is rotated by the original, and when the original is stopped by a supply gate plate 11, which will be described later, the rotation of the ball 8 is stopped. However, the weight of the ball 8 and the frictional force between the roller 10 and the document are appropriately set so that the roller 10 idles on the back surface of the document.

Reference numerals 14 and 15 denote a pair of rails that are combined with each other, the rail 14 being fixed to the frame 2 and the rail 15 being fixed to the main body 16. Then, the platen 1 and the drive roller 4
, a belt 5, a driven roller 4', an upper guide plate 7 equipped with a ball 8, etc. constitute a document table together with the frame 2,
This document table is slidably arranged relative to the main body 16 via rails 14,15. 7 is an exposure scanning optical system disposed in the main body 16 below the platen 1, and is composed of a light transmitting body 18 for projecting a light image onto a photoreceptor (not shown) and a light source 19.20. . In FIG. 1, l is the effective exposure length ab of the platen 1, and L is the distance between the exposure section 17 and the end surface C of the main body side rail 15.

Reference numeral 12 denotes a lower movable guide plate having a notch 13 of the number of holes at one end, and the other end is fixed to a cut-out piece 22.22 of the base plate 21 of the sheet document guide and supply section, as shown in FIG. It is pivotally attached to a shaft 23 that is rotatable up and down about the shaft 23 as a center of rotation. Both ends of a spring 24 wound around a shaft 23 are brought into contact with the base plate 21 and the lower guide plate 12 to urge them apart from each other. Also,
A fin portion 25 having an elongated hole 26 is integrally formed on both sides of the lower guide plate 2, and a stopper pin 27 having a flange 28 is loosely fitted into the elongated hole 26. The upper surface of the fin portion 25 is pressed against the lower surface of the flange 28 of the stopper pin 27 by the spring force, thereby restricting rotation of the lower guide plate 2 about the shaft 23.

The above-mentioned supply gate plate 11 is rotatably attached to the shaft 23 so as to be located on the back side of the lower guide plate 12, and a spring 29 also wound around the shaft 23 allows the supply gate plate 11 to rotate.
The guide plate 1 is biased in the same direction as the lower guide plate J2.
2, and its position is regulated. Note that there are many upwardly bent portions 3 at the tip of the gate plate 1.
0 is formed, and the bent portion 30 passes through the tip notch 13 of the guide plate 12 and connects to the notch 7 of the upper guide plate 7.
The sheet original supply path 31 formed between the upper guide plate 7 and the lower guide plate 12 is normally blocked. A pin 33 is fixed to one end 32 of the shaft attachment part of the gate plate] 1, and the other end of the pin 33 is provided at the other end of a lever 34 attached to the plunger of the solenoid 36. It fits into the arc-shaped elongated hole 35. Note that the approximate center of the arc-shaped elongated hole 35 is formed to coincide with the axis of the shaft 23.

A pin 37 is fixed to one side end of the lower guide plate 12, and the tip of this pin 37 engages with a lever part 39 provided at the intermediate side of the platen stopper 38.

The lower end of the platen stopper 38 is attached to the plunger of the solenoid 40, and the upper end is always held by a spring 42 so as to fit into a stopper hole 41 provided in the frame 2.
The upper position is regulated by a stop member (not shown).

Reference numeral 44 denotes a cover attached to the main body 16, which is arranged so that a portion of the lower guide plate 2 and the tip near bent portion 30 of the supply gate plate 1 protrude from a hole 45 formed in the cover; The upper surface of the protruding portion of the lower guide plate 12 constitutes a slide supply surface of the sheet document supply path 31. Further, the main body cover 44 is further provided with a hole 46,
A portion of the supply roller 10 driven by the motor 43 protrudes from the crest hole 46 .

The positional relationship in the height direction between the lower guide plate 12 and the guide 6 at the tip of the platen can be appropriately set by adjusting the screwing amount of the stopper pin 27.

FIG. 4 is an enlarged perspective view showing the arrangement relationship between the upper guide plate 7 attached to the platen cover 3 and the main body cover 44. In FIG. 4, reference numerals 47 and 48 denote side guide plates for sheet documents attached to the platen cover 3, the lower end of which faces the stepped portions 4, 9, and 50 of the main body cover 44 with a slight gap. In addition, the lower end surfaces of the side guide plates 47 and 48 and the bottom surface 5 of the main body cover 44]
, 52 are also provided, so that when the document table including the upper guide plate 7 and side guide plate 47.4B is moved, the upper guide plate 7 and the side guide plate 47.4B are moved.
8 and the main body cover 44 so that no friction or the like occurs between them.

In addition, 53 is a sheet original insertion opening formed at the tip between the upper guide plate 7 and the main body cover 44, 54 is a sheet original exposure scanning transport opening formed by the transport belt 5 and the guide 6, and 55 is a sheet original insertion opening. This is a sheet document ejection port.

Next, the operation of the document exposure and scanning device configured as described above will be explained.

In the sheet mode in which a sheet original is exposed and scanned, a sheet original is first inserted from the sheet original insertion slot 53, and the sheet original is detected by a sensor (not shown), which drives the motor 43, and the supply roller 10 and ball While being subjected to alignment action by the gate plate 8, it is fed to the supply path 31 between the upper and lower guide plates 7 and 12, and comes into contact with the bent portion 30 of the gate plate 1 and stops. At this time, the roller 10 is rotating while slipping on the back side of the sheet document.

When synchronized with the photoreceptor and the solenoid 36 is turned on, the lever 34 is retracted, and the gate plate J resists the spring force of the spring 29 via the pin 33 fitted in the circular arc-shaped elongated hole 35. The gate plate 11 that was being rotated and blocking the sheet original
The bent end portion 30 of is retracted from the supply path 31. When the number of objects blocking the advance of the sheet document is reduced to 1, the document is again fed by the action of the rollers 0 and the ball 8, and is delivered to the sheet document transport port 54 formed by the transport bell 5 and the guide 6. When the image reaches the photoreceptor, it is conveyed over the platen 1 by conveyor belt No. 5, which starts rotating in synchronization with the photoreceptor, passes over the exposure scanning optical system 7, is exposed, and is discharged from the discharge port.

When exposing and scanning a book original, remove the platen cover 3.
After opening the book document and placing the book document at a predetermined position on the platen 1, the platen cover 3 is closed again. Conveyor belt 5
The platen presses and holds the book original on the platen by indenting it by the thickness of the book original.

When the print start signal is issued, the solenoid 40 is turned on, and the platen stopper 38 is pulled down against the spring 42, and its tip is removed from the stopper hole 41 of the frame 2.
At the same time as unlocking the document platen, press the platen stopper 3.
The lever part 39 of 8 presses down the pin 37, which causes the lower guide plate 12 to rotate against the spring 24, and the guide plate 1
The protruding part from the hole 45 of the main body cover 44 of No. 2 is retracted,
Evacuate from the movement path of the document table. At this time, the gate plate 11
is brought into contact with the back surface of the guide plate 12 by the spring 29, so it rotates together with the rotation of the guide plate 12, and its tip bent portion 30 also retreats from the movement path of the document table. In addition, at this time, the pin 33 provided on the shaft attachment part of gate plate 1 is
Since the lever 34 rotates along the arcuate elongated hole 35, even if the gate plate 1 is rotated together by the guide plate 2,
This does not cause any hindrance to the rotational movement of the gate plate 11.

Through these operations, when the movement path of the document table ζ becomes clear of obstacles, the document table moves from its initial position (home position) in the direction shown by arrow A in FIG. At the point where one end a of the effective exposure length has passed slightly past the exposure scanning optical system 17, it countertransfers and moves in the direction opposite to arrow A, synchronizes with the photoreceptor, and moves onto the exposure scanning optical system 17. When the other end of the effective exposure length of the platen 1 reaches the exposure part J7, it reverses again in the B direction and returns to the initial position. When the document table approaches the Baum position, the solenoid 4o is turned off, and when the platen 1 reaches the home position, the platen stopper 38 enters the stopper hole 41 of the frame 2 by the spring 42, and the document table is locked. The guide plate 12 and gate plate 11 also return to their original positions.

As is clear from the above description, during book document exposure scanning, the sheet document supply section can be retracted from the document table moving path with a simple mechanism, and the document table can be moved smoothly. Further, the movement stroke of the document table during exposure scanning of the book document has a length that is approximately equal to the effective exposure length that is approximately equal to the length of the platen. In this case, by appropriately setting the position of the exposure scanning optical system 17, the amount of protrusion of the document table from the copying machine main body during exposure scanning of the book document can be equally distributed between the left and right sides.

As described above in detail based on the embodiments, the present invention provides an exposure scanning optical system for an original at the lower part of the platen when the original table is located at the home position, and a sheet original is further conveyed on the platen for book originals. A means is provided so that the original platen can be used for exposure scanning of sheet originals, and a means is provided adjacent to the platen so that the sheet original guide and supply section can be retracted from the original table moving path. Since the exposure scanning device is configured, even if it is equipped with a sheet document exposure scanning conveyance means, the movement stroke of the document table during exposure scanning of a book document can be reduced, and the amount of protrusion from the device body is reduced. The space required for the device body can be reduced.

Furthermore, since the amount of protrusion of the document table from the main body of the apparatus can be reduced, it is possible to reduce the adverse effects on the image quality and drive system due to the deflection of the document table.

Furthermore, since the sheet document supply section is provided in the portion of the document table adjacent to the platen, effects such as the ability to easily arrange the sheet document alignment mechanism can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a document exposure and scanning device of a copying machine according to the present invention, FIG. 2 is an enlarged perspective view of a sheet document supply section of the device shown in FIG. 1, and FIG. Plan view,
FIG. 4 is a diagram showing the arrangement relationship between the upper guide plate and the main body cover in the sheet document supply section. In the figure, 1 is a platen, 2 is a frame, 3 is a platen cover, 5 is a conveyor belt, 6 is a guide, 7 is an upper guide plate, 8 is a ball, ] o is a sheet document supply roller, 1J
12 is a gate plate, 12 is a lower guide plate, 16 is a main body, 17 is an exposure scanning optical system, 3o is a bent part of the gate plate, 31 is a document supply path, 36 is a solenoid, 37 is a pin, 38 is a platen stopper, 4o is a solenoid, 43 is a motor, 44 is a main body cover, 47 and 48 are side guide plates, and 53 is a sheet original insertion slot. Patent Applicant Olympus Optical Industry Co., Ltd. Figure 1 Procedural Amendment January 72, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of the Case 1986 Patent Application No. 186759 2, Title of Invention In a copying machine Manuscript exposure scanning device 3, relationship with the case of the person making the amendment Name of patent applicant Representative Shigeru Kitamura Male 4 Name of agent (8727) Patent attorney Kenji Mogami 5 Date of amendment order None 6, due to the amendment Number of inventions to be increased None 7, Detailed explanation of the invention column 8 in the specification subject to amendment Contents of the amendment (1) In the 6th line of page 5 of the specification, "platen cover 5" was replaced with "platen cover 5". Cover 3” is corrected. (2) On page 12, line 13 of the specification, the phrase "once reaching [exposure section] 7, move again in direction B" was replaced with "exposure scanning optical system] 7.
When it reaches , it corrects it again in the incoming direction. that's all

Claims (1)

[Scope of Claims] (]), a platen for placing a book original for exposure scanning, an upper sheet original guide supply unit disposed adjacent to the platen, and a sheet between the surface of the platen. a sheet document conveying means that forms an exposure scanning conveyance path for the document; and a document table that is reciprocatably installed in the main body and is configured to retreat from the movement path when the document table is moved; a lower sheet document guide and supply section for cooperating with the document guide and supply section to supply the sheet document to the sheet document exposure scanning conveyance path; and an exposure scanning optical system disposed below the platen at the home position of the document table. What is claimed is: 1. A document exposure and scanning device for a copying machine, comprising: (2) Document exposure of the copying machine according to claim 1, wherein the lower sheet document guide and supply section includes a document alignment mechanism, a document elevation guide plate, and a supply gate plate. scanning device.