JP3006384B2 - Copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine having an exposure apparatus.
It is about the machine .

[0002]

2. Description of the Related Art Conventionally, an exposure apparatus of a copying machine generally has a configuration disclosed in Japanese Patent Publication No. 2-701 and Japanese Patent Publication No. 2-19936. The former uses a shaft to drive on one side, and the latter slides rails on both sides to drive on both sides.

[0003] According to the former patent attached drawing (Fig. 3), a wire stretched from a drive motor 23 to six pulleys is stuck.
The first carriage 4 is driven at a speed (V), and the second carriage is provided with a movable pulley and is configured to be driven in the same direction at half the speed (V). Further, the second motor 26 and the cam mechanism for transmission are required for application to variable-magnification copying.

In the latter patent attached drawing (FIG. 1), the portion applied to the variable-magnification copying is not disclosed, but the same drive as the former is performed by attaching two wires on both sides to a large number of pulleys.

[0005]

However, in the above-described configurations, both examples use a long wire, fix the wire on the first mirror, provide a movable pulley on the second mirror, drive the wire over the wire. are doing. Further, a first mirror and a second mirror, which are typical cases of a variable-magnification copying machine,
In the method of changing the magnification by changing the distance between the mirrors, a pulley and a drive motor for the same wire were further required, and the structure became more and more complicated. Not only does this increase the size of the machine, but also significantly lowers the workability of assembling, and it is the most difficult to assemble in the entire process of copying machines, not only in automatic assembly but also in manual assembly. Was.

According to the present invention, in order to solve the above-mentioned problems, an inexpensive and affordable pulse motor has recently been provided. By using the motor, a complicated exposure apparatus can be made a simple mechanism, automatic assembly is possible, and inexpensive. A copying machine provided with an exposure device is provided .

[0007]

In order to solve the above-mentioned problems , the invention according to claim 1 reflects light reflected from a document.
A second mirror having a first reflecting mirror and driven by a first pulse motor;
A first carriage, and a second carriage for reflecting light from the first reflecting mirror.
The second mirror having two reflecting mirrors and driven by a second pulse motor
And the first carriage is located at a predetermined detection position.
After passing through the first pulse motor, the first pulse motor
Is detected, the number of movement pulses until the start of exposure is counted.
First counting means for counting, and the second carriage
After the pulse has passed a predetermined detection position, the second pulse mode
When the camera detects that the angle is
Second counting means for counting the number of movement pulses;
It is provided.

[0008]

According to the present invention, the light reflected from the original is provided by the above-described structure.
Driving a first carriage having a first reflecting mirror for reflecting light at a speed V by a first pulse motor ;
A second carriage having a second reflecting mirror for reflecting the light of the reflecting mirror is driven at a speed V / 2 by a second pulse motor, and a predetermined detection position is detected for each, and the number of movement pulses is determined.
Reading the original while keeping the relative position between the first and second mirrors constant by counting
Can be. As a result, the driving of the first carriage and the driving of the second carriage are separated, and the transmission member therebetween is simplified.
A structure that is easy to assemble and assemble can be obtained. further,
It can enable automatic assembly by robots Using a timing belt to the transfer member.

[0009] Further , by separating the driving, the first
There may be a displacement between the first mirror and the second mirror , but as a countermeasure, the first pulse motor and the second
Both pulse motors and pulse motors have a predetermined angle
Means for detecting the presence of the first pulse motor and
Each of the second pulse motor and the predetermined detection position
After passing, it is detected whether or not it has reached a predetermined angle,
Counts the number of movement pulses until the start of exposure
As a result, the positional accuracy can be accurately obtained.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a copying machine having a structure according to the present invention. An exposure optical system 1, an image forming mechanism 2 for forming an image by exposure by the exposure optical system 1, and a paper And a paper feed mechanism 3 for feeding the paper. The exposure optical system 1, the image forming mechanism 2, and the paper feeding mechanism 3 may be integrally formed or may be separately formed. In particular, the paper feed mechanism 3 is a mechanism in which a plurality of separate paper feed units 3a are stacked for each paper size.

The exposure optical system 1 includes a lamp 5 and a first reflecting mirror 6, which move under the platen glass 4 to scan an original.
A second reflecting mirror 7 moving at a speed ratio of 1/2 with the first reflecting mirror 6, a lens 8 moving to keep the optical path length constant, a third
A reflecting mirror 9 and a fourth reflecting mirror 10 are provided.

The image forming mechanism 2 includes a photosensitive drum 11 and a charging unit 12, a side erase 13,
It has a developing unit 14, a transfer unit 15, a cleaning unit 16, and the like, and forms a toner image corresponding to a document image to be exposed on the photosensitive drum 11 by a general electrophotographic method,
Transfer to the fed paper. In front of the transfer section where the photosensitive drum and the transfer means are opposed to each other, the leading ends of the sheets 19 sent one by one by the sheet feeding roller 17 and the sabaki roller 18 of the sheet feeding mechanism are stopped, and the leading ends are aligned. A pair of registration rollers 20 for adjusting the feeding timing
Are arranged. Behind the transfer section, there are provided a fixing device 21 for fixing the transferred paper 19 and a pair of discharge rollers 22 for discharging the paper sent from the fixing device 21.

These paper transport systems are unit mechanisms that can be opened and closed with the paper transport system as a boundary so that jam clearance can be easily performed.

The paper feed mechanism 3 is provided with paper 19 of different sizes.
And a paper feed unit including a paper path 24. The sheet feeding units are stacked for each sheet size to enable sheet feeding corresponding to each size.

Reference numeral 25 denotes a tray for manual insertion, and reference numeral 26 denotes a discharge tray. FIG. 2 is a detailed view of a driving portion of the exposure optical system 1. The lamp 5 and the first reflecting mirror 6 are integrally held by a carriage A 30 and driven at a constant speed (V) by a pulse motor A 32 via a drive transmitting member A 40. The detection member A 34 detects the position of the carriage A 30 and controls the exposure start position based on the count number stored in the counter A 36. Further, the pulse motor A 32 is provided with a detection member B 38 for detecting one rotation of the position, and absorbs a detection position error of the detection member A 34. The second reflecting mirror 7 is held by the carriage B31, and is driven by the pulse motor B33 via the drive transmission member B41, at a speed (V / half) of a half of the moving speed (V) of the carriage A30.
It is driven in 2). The detecting member C 35 is the carriage B 3
The position of 1 is detected, and the exposure start position is controlled by the count number stored in the counter B 37. further,
The pulse motor B33 is provided with a detection member D39 for detecting one rotation of the position, and absorbs a detection error of the detection member C35. The necessity of the detection member B 38 and the detection member D 39 depends on the characteristics of the lens used for the exposure optical system. However, when a lens with a small depth of focus is used to provide an inexpensive exposure optical system, the temperature and the like are required. Detection member A
34, it is effective as an absorbing means against occurrence of a detection position error of the detection member C35. When the power of the apparatus is turned on, the pulse motor A 32 and the pulse motor B 3
Numeral 3 drives the carriage A 30 and the carriage B 31, respectively. First, the position is detected by the detecting member B 38 and the detecting member D 39. Further from there pulse motor-A3
Reference numeral 2 designates the carriage A30 by the number of count pulses stored in the counter A36 and the pulse motor B33.
Moves the carriage B31 by the number of count pulses stored in the counter B37 and stops. (Exposure start position) When an exposure start instruction is issued, the pulse motor A 32 and the pulse motor B 33 start simultaneously and the carriage A 30
At a speed V and the carriage B 31 at a speed V / 2. Then, if necessary, after scanning the document reading distance, it returns to the exposure start position and stops again. In addition, in this embodiment, the counter A 36 and the counter B 37 are provided with input means A 42 and input means B 43 for the count number, respectively. This is because it is necessary to correct the positional relationship between the first reflecting mirror and the second reflecting mirror due to the variation in the focal length of the lens used in the exposure optical system, and to correct the image position deviation from the sheet 19 (FIG. 1). The detection member A 3
The correction can be performed without the need for a position adjusting mechanism of the detection member 4 and the detection member C 35 or the detection member B 38 and the detection member D 39. In addition, a timing belt is used for the drive transmission members 40 and 41, so that automatic assembling can be performed as compared with a commonly used wire. In this embodiment, this exposure optical system is applied to a variable-magnification copying machine, and a magnification setting means 44 is provided in a user operation portion, and a count pulse changing means for changing the number of count pulses of the counter B 37 according to the set value. 45, the exposure start position of the second reflecting mirror is changed, and the first reflecting mirror and the second
The relative positional relationship of the reflecting mirrors is changed to be opposite according to the magnification. Thus, it is possible to change the distance between the lens 8 (FIG. 1) and the document without adding a new driving means and mechanism. A fine adjustment device 46 is connected to the count pulse changing means 45. The count pulse changing means 45 controls the counter B 3 according to all possible set magnifications.
A method of storing the change positive value of the count pulse number of 7 in a table or a method of storing an equation corresponding to the magnification and calculating each time the set magnification is input can be considered, but in the present embodiment, the latter is adopted. are doing. The fine adjustment device 46 enables fine adjustment at the time of assembling because the change amount of the number of count pulses according to the magnification is not constant due to the variation of the focal length of the lens 8. The method differs depending on the count pulse changing means. Is suitable for inputting a correction coefficient of an expression in the case of a table rewriting expression or an expression storage method. This fine adjustment device 46 is not changed by the user after it is optimally set at the time of assembling the copier at the factory or at the time of delivery to the user.

[0017]

As described above, according to the present invention, the driving of the first reflecting mirror and the driving of the second reflecting mirror are separated from each other , and
Detects whether it has passed the detection position and counts the number of movement pulses.
By removing the long wire, which has been a bottleneck in conventional assembly, while maintaining the image reading accuracy of the original, a copier equipped with an exposure device with a simple configuration and at low cost can be realized.
realizable.

Further, even if the drive is separated, the first valve
Pulse motor for both the motor and the second pulse motor
A means for detecting whether the camera is at a predetermined angle.
Each of the pulse motor and the second pulse motor
Whether the specified angle has been reached after passing the specified detection position
Is detected, and when a predetermined angle is reached, the movement pulse until the start of exposure
Since the number is counted, the first mirror and the second
Position accuracy with respect to the reflector can be accurately obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a copying machine having an exposure apparatus according to the present invention.

FIG. 2 is a perspective view in which a part of an exposure apparatus according to an embodiment of the present invention is omitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exposure optical system 2 Image forming mechanism 3 Paper feed mechanism 4 Platen glass 5 Lamp 6 First reflecting mirror 7 Second reflecting mirror 8 Lens 9 Third reflecting mirror 10 Fourth reflecting mirror 30 Carriage A 31 Carriage B 32 Pulse motor A 33 pulse motor B 34 detection member A 35 detection member C 36 counter-A 37 counter-B 38 detection member B 39 detection member D 40 drive transmission member A 41 drive transmission member B 42 input means A 43 input means B 44 magnification setting Means 45 Count pulse changing means 46 Fine adjustment device

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 27/50 G03B 27/34

Claims (1)

(57) [Claims] A first reflecting mirror for reflecting the reflected light of the original;
A first carriage driven by a first pulse motor
And a second reflector for reflecting the light of the first reflector.
And a second carriage driven by a second pulse motor
And the first carriage has passed a predetermined detection position.
Later, it is detected that the first pulse motor is at a predetermined angle.
The number of movement pulses until the start of exposure
1 counting means and the second carriage
After passing through the exit position, the second pulse motor
When the angle is detected, the number of movement pulses until the start of exposure
And second counting means for counting the
Machine.