JPS59178441A - Image forming device - Google Patents

Abstract

PURPOSE:To reduce an opening and closing moment by constituting a home position of an optical system in a supporting point side. CONSTITUTION:A mirror 5 and an exposing lamp 4, and mirrors 6, 7 are supported by the first carriage 411 and the second carriage 412, respectively, and these carriages 411, 412 are guided by guide rails 421, 422 and are freely movable in parallel in the direction as indicated with an arrow (a). Since a home position of the mirror 5 is set to a point A, that is to say, since the carriages 411, 412 and an optical system 3 are placed at a supporting point 52 side, it does not occur that the carriages 411, 412 drop when a device is opened, and also since their weight exists in the vicinity of the supporting point A, an opening and closing moment of the device can be reduced.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to image formation in a copying machine, for example, which performs copying by reciprocating an optical system with a fixed manuscript table, and whose upper unit can be rotated. Regarding equipment.

[Technical Background of the Invention] For example, a copying machine with a fixed document table is capable of moving an optical system such as an exposure lamp and a mirror along a fixed document table by moving a carriage to which the optical system is fixed. The scanner is moved back and forth, and copies are made by exposing and scanning the original set on the original table. In addition, in the above-mentioned copying machine, in order to facilitate the work of removing paper jams around the photoconductor, the paper conveyance path is divided into upper and lower halves, and the upper unit is rotatably displaced. An opening device has been developed and put into practical use.

[Problems with background technology]

However, from Maro's point of view, in the above-mentioned device, opening and closing is performed using the paper feed side as a fulcrum, and since the home position of the carriage is on the opposite side of the paper feed side, the carriage, mirror, and exposure lamp are Due to the weight of the optical system such as the lens, the opening/closing moment increased and the opening force of the upper unit was required to be large. Furthermore, when the upper unit is opened, a falling force acts due to the weight of the carriage and optical system, causing the carriage and optical system to fall.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object thereof is to provide an image forming apparatus that can reduce the opening/closing moment and prevent the optical system from falling.

[Summary of the invention]

In this invention, the home position t of the optical system is set at the fulcrum side for opening and closing.

[Embodiments of the invention]

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

FIG. 1 schematically shows an image forming apparatus, such as a copying machine, according to the present invention. That is, 1 is a main body of a copying machine, and a document table (transparent glass) 2 is fixed to the upper surface of the main body 1 to support a document. The original set on the original platen 2 is exposed to an exposure lamp 4 and mirrors 5, 6.7.
By reciprocating the optical system 3 in the direction of arrow a along the lower surface of the document table 2, a trap is formed so that exposure and scanning are performed during the reciprocating movement. In this case, mirror 6.7 moves at the speed of the rod of mirror 5 so as to keep the optical path length constant. The light reflected from the original by the scanning of the optical system and the light reflected from the original by the light irradiation of the light exposure run f4 are reflected by the mirrors 5, 6.7, and then pass through the imaging lens block 8. , and is further reflected by the mirror 9 and guided to the photoreceptor drum 10, so that the image of the document is transferred to the photoreceptor drum 1.
The image is formed on the surface of 0. Above optical system 3
The home position is at the right end of the drawing near the fulcrum 52, which will be described later.

The photosensitive drum 10 rotates in the direction of arrow C, and the surface is first charged by the charger 11, and then an electrostatic latent image is formed by exposing the original image to slit light. The electrostatic latent image is made visible by applying toner by a developing device 12.

On the other hand, the paper (image-forming object) P is taken out one by one from the selected upper paper feed cassette 7) or lower paper feed cassette 14 by the delivery roller 15 or 16, and is taken out one by one through the paper guide path 17 or 18. Through registration roller vs. 19
and is sent to the transfer section by this pair of rollers 19. Here, each of the above paper feed cassettes 13
14 is removably provided at the lower right end of the main body 1, and either one can be selected using an operation channel (not shown). Note that each of the paper feed cassettes 13 and 14 has a cassette size detection switch 3.
The cassette size is detected by 01.30□. These detection switches 301, 30. is composed of a plurality of microswitches that are turned on and off depending on the insertion of cassettes of different sizes. The sheet P sent to the transfer section is brought into close contact with the surface of the photoreceptor drum 10 at the portion of the transfer charger 20, so that the toner image on the photoreceptor drum 10 is formed by the action of the charger 20. is transcribed. The transferred paper P is peeled off from the photoreceptor drum 10 by the action of the peeling charger 21 and conveyed on the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device provided at the terminal end of the conveyor belt 22. By passing through this, the transferred image is fixed. After fixing, the paper P is discharged to the outside of the main body 1 by a pair of paper discharge rollers 24.

Further, the photoreceptor drum 10 after the transfer is transferred to a charger 26 for removing static electricity.
After the static electricity is removed by the cleaner 27, the residual toner on the surface is removed, and the afterimage is further erased by the static electricity removal run f2B, so that the initial state is returned. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

Here, a paper transport path 51 is formed by the transport roller pair 19, the transport belt 22, the paper discharge roller pair 24, and a guide plate (not shown) appropriately disposed between these. A photoreceptor drum 10 and a transfer charger 20 are arranged at the end, and the fixing roller pair 23 is arranged at the end thereof.

Further, as shown in FIG. 2, the main body 1 can be separated into an upper unit (first unit) 1□ and a lower unit (second unit) 12 with a paper conveyance path 51 as a boundary. . Then, the upper unit 1. has one end rotatably supported on the lower unit 1□ via a support shaft (fulcrum) 52, and is 1 inch in size so that it can be opened and closed.In this way, the upper and lower units are connected. The separable main body 1 is provided with an opening/closing mechanism 53 that opens and closes the upper unit 11 and the entire lower unit 1□. and,
If the paper P gets stuck in the paper conveyance path 51 for some reason, most of the paper conveyance path 51 can be opened, and the jammed paper P can be easily removed. −
1: When the optical system 3 is opened, the home position of the optical system 3 is near the fulcrum 52, so that the optical system 3 will not fall if the opening/closing moment is less than the girl. .

On the other hand, a dart 150 is provided on the ejection side of the ejection roller pair 24, 24, and by the operation of this gate 15°, the paper P ejected from the ejection roller pair 24, 24 enters the introduction path 151 during double-sided copying. It is about to be introduced. The paper P introduced into this introduction path 151 is
2.152, conveyance bell provided on the bottom side of the main body l) 153.153, and conveyed.

The sheet P is then reversed by the reversing path 154 and then fed to the registration rollers 19.

FIG. 3 shows the operation panel, including a copy key 131 for issuing a command to start copying, and a numeric keypad 132 for setting the number of copies, etc.
, a display 133 that displays the number of sheets, a density setting device 134 that sets the copy density, an upper cassette selection key 135 that selects the upper paper feed cassette 13, and its indicator light (LED).
)
B. Paper size indicator for each cassette 139.140,
The division key 14 for specifying division copying and its indicator light (
LED) 142, a release key 143 for canceling split copying and its indicator light 144, a double-sided key 1 for specifying double-sided copying
45 and its indicator light (LED) 14e, release key 147 for canceling double-sided copying and its indicator light (LED)
148.

FIG. 4 shows an example of the configuration of a drive source for each drive section of the copying machine configured as described above, and is composed of the following motors. That is, 31 is a lens motor, which is a motor for moving the position of the lens block 8 for changing the magnification. For example, when sequentially exposing a first range and a second range on the original platen 2, the motor 31 is 1.00 times the first range) and 1.00 times the second range. The position of the lens block 8 is moved so that the magnification is increased by .02 times. Reference numeral 32 denotes a mirror motor for changing the distance (optical path length) between the mirror 5 and the mirror 6.7 for changing the magnification. 33 is a scanning motor, which connects the exposure lamp 4.
and a mirror 5, and a motor for moving the mirror 6.7 for document scanning. Reference numeral 34 denotes a shutter motor for moving a shack (not shown) for adjusting the charging width of the photosensitive drum 10 by the charger 11 during zooming. A developing motor 35 is a motor for driving the developing roller of the developing device 12 and the like. A drum motor 36 is a motor for driving the photosensitive drum 10. A fixing motor 37 is a motor for driving the paper conveying path 22, the pair of fixing rollers 23, and the pair of paper ejecting rollers 24.

A paper feeding motor 38 is a motor for driving the delivery rollers 15 and 16. 39 is a paper feed motor;
This is a motor for driving the registration roller pair 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 5 shows a moving groove for reciprocating the optical system 3. That is, the mirror 5 (and exposure lamp a4) is supported by the first carriage 41□, the mirror 6.7 is supported by the second carriage 41□, and these carriages 4H and 412 are supported by the guide rails 42□ and 42□.
It is guided by and can freely move in parallel in the direction of arrow a.

Thus, the four-phase pulse motor 33 drives the pulley 43. An endless belt 45 is stretched between the pulley 43 and the idle pulley 44, and one end of a first carriage 41□ that supports the mirror 5 is fixed to a midway portion of the belt 45.

On the other hand, two pulleys 47, 47 are rotatably provided on the guide portion 46 of the rail 42□ of the second carriage 4□ that supports the mirror 6.7, spaced apart in the axial direction of the rail 42□. , a wire 48 is stretched between these pulleys 47° 47, one end of this wire 48 is connected to the fixed part 49 through a coil spring 50, and the other end is connected to the fixed part 49 via a coil spring 50.
are fixed respectively. Further, one end of the first carriage 4 is fixed to the middle part of the wire 48. As the Nockles motor 33 rotates, the belt 45 rotates and the first carry horn 41. moves, and the second barrel 412 also moves accordingly. At this time, the second carriage 41
□ moves in the same direction at the speed of death. The moving directions of the first and second carriages 411, 41□ are controlled by switching the rotational direction of the gusset motor 33.

The first carriage 411 is set at a position that is the sum of the length of the paper P in the feeding direction and the deceleration distance of the carriage 411 itself, in accordance with the paper size of the selected paper feed force sector.

6 and 7 show the relationship between the document table 2 and a moving mechanism for moving the optical system 3. FIG. That is, a scale 61 is provided on the document table 2 on the top surface of the main body 1 to indicate the length that can be copied according to various sizes of documents. Also,
The first carriage 411 that supports the exposure lamp 4 is provided with a scale 62 on its upper part (lower part of the original platen 2) to indicate the length that can be copied on the original platen 2.

In the above scale, 61.62 is, for example, rA4 size” and “A4 size”.
It shows the length of 5 sizes. Also, the first
An auxiliary display section 63 is fixed to the carriage 41□ for displaying the copy range of the original, which is provided below the ground glass section 2□ which is provided outside the copy range of the document table 2. This auxiliary display section 63 has a light source 64° slit 6 as shown in FIG.
5. It is composed of a lens 66. Note that the scale 62 is set at a position corresponding to the length of the paper in the feeding direction υ in accordance with the paper size of the selected paper feed cassette.

FIG. 9 shows the overall control circuit, which is mainly composed of a main processor group 71 and first and second sub-processor groups 72 and 73. The main processor group 71 is
An operation panel 74 and various switches and sensors, such as a high-voltage transformer 76 that detects inputs from input devices 75 such as the charge size detection switches 30□ and 302 and drives the various chargers, the static elimination lens 28, and the cleaner. 27 platen lenoid 27a.

The heater 23a1 of the pair of fixing rollers 23, the exposure lamp 4, and each of the motors 31 to 40 are controlled to perform the above-described copying operation. Among the motors 31 to 40, motors 35 and 37.

A toner motor 77 that supplies toner to 40 and the developer/device 12 is controlled by the main processor group 71 via a morph driver 78 , and the motors 31 to 34 are controlled by the first sub processor group 72 via a pulse motor driver 79 . The motors 36, 38, and 39 are controlled by the second sub-processor group i3 via the pulse smoke driver 80.
be controlled. The exposure lamp 4 is still connected to the lamp regulator 8.
The heater 23a is controlled by the main processor group 7 via the heater control section 82.

Then, commands to drive and stop each motor are sent from the main processor group 7 to the first and second sub-processor groups 72 and 73, and instructions to drive and stop each motor are sent from the first and second sub-processor groups 72 and 73 to the main processor group 7. A status indicating whether the motor is running or stopped is sent. Further, the first sub-processor group 72 receives position information from a position sensor 83 that detects the initial positions of the motors 31 to 34.

FIG. 10 shows an example of the configuration of the main processor group 7. In other words, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer) that has an HD, input/output,
4 and 92 are used to detect human power of keys on an operation panel (not shown) and to control various displays. Also, is the microcomputer 91 input/output cuff J? It is expanded by =Gts 93-96. A high voltage transformer 76 is connected to the input/output port 93.
, a motor driver 78, a Shinzo regulator 81, and other outputs are connected to the input/output port 94, and a size switch for detecting paper size and its respective input are connected to the input/output port 94. -) 95 is connected to a copying condition setting switch and its respective inputs. Note that the input/output port 96 is for an option.

FIG. 11 shows an example of the configuration of the first sub-zero setter group 72. In other words, 101 is a maiko. 1
02 is a programmable interval timer for controlling the phase switching interval time of Gurusmoke, microcontroller 10
By setting a set value from 1, a count is performed based on the set value, and when the count is out, an end pulse is output to the interrupt line of the microcomputer 101. The above timer 102
The reference clock <' is input to . Also,
The microcomputer 101 receives position information from the position sensor 83, and inputs and outputs the input/output capo) 103.1
04 is connected. And the above input/output port lo
The motors 31 to 34 are connected to the motor 4 via the motor driver 79. The input/output board 1o3 is used for outputting status signals of each pulse motor to the main processor group 71.

FIG. 12 shows an example of the configuration of the second sub-processor group 73. That is, 111 is a microcomputer connected to the sea main processor group 71. 112 is a programmable interval timer for controlling the phase switching interval time of the i+rus motor, which counts based on the set value set from the microcomputer 111;
When the count is out, a termination pulse is output.

This termination pulse is latched by the latch circuit 113, and its output is supplied to the interrupt line of the microcomputer 111 and the input/output port input line. Further, an input/output port 114 is connected to the microcomputer 111, and this input/output port 11
4 is connected to the motor 3 via the pulse motor driver 80.
6, 38, and 39 are connected.

Figure 13 shows the control circuit of the pulse motor, with input/output ports 12 (input/output ports in Figures 11 and 12).
104.114) is Noyars motor driver 1
22C9i<9 tR pulse router driver in figure 79.80
) is connected to this pulse motor driver 122
Ni Nogurusu% - Yu 123 (the pulse motors 31 to 34
, 36 , 38 .

Each of the windings A, A, B, and 100 (equivalent to 39) are connected.

Figure 14 shows the speed control method of a pulse motor.
The figure (a) shows the speed curve of the Guls motor, and the figure (b) shows the phase switching interval. As is clear from this figure, the phase switching intervals are long at first, gradually become shorter, then become equal intervals, gradually become longer again, and then stop. That is,
This shows the through-down and through-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and eventually starting up. In addition, t1+t2...
tX indicates the time of phase switching interval.

Next, the operation in such a configuration will be explained. For example, right now, after the power is turned on, the main processor group 71 determines whether the paper P is on the paper transport path 51 in response to a signal from the switch sensor 75.
Check that there is no residue on top. Then, if there is no remaining, the main processor group 71 detects the detection switch 301
The size of the paper in the upper cassette 13 is determined based on the detection signal from the cassette 13, and an initialization signal for the optical system 3 and a signal indicating the length of the paper P are output to the microcomputer 101 in accordance with the result of this determination. Then, the microcontroller 10 is the pulse motor driver 7.
When the motor 33 is driven using 9f, the first and second carriages 41□ and 412 are moved. As a result, Yoshi, Mira, and -65 are moved from point A to BA as shown in FIG. Then, the microcomputer 101 moves the scale position of the system school 62 for a predetermined period of time after the initial position detection signal for the motor 33 is outputted from the position sensor 83 until the scale position of the system school 62 becomes the length of the sheet P in the conveyance direction. At this point, the mirror 5 is moved from point B to point C as shown in FIG. At this time, the lighting of the auxiliary display section 63 is controlled by the main processor group 71 to provide an auxiliary display of the copy range. In addition, 1 microcomputer 1 () 1 ij
Lens motor 3 using Hals motor driver 79
1. By driving the mirror motor 32 and shutter motor 34, the lens, mirror, and shutter are moved to the initial position and then to the same magnification position to complete the initialization. 1, when the power is turned on, main processor group 7
The heater 23a is turned on to drive the motor driver 78 and control the motor 82. and,
When the temperature of the heater 23'a reaches a temperature that allows fixing, the main processor group 41 displays a message indicating that copying is possible.

In this situation, two A4 size originals are
Assume that copies are made on four sizes of paper P. First, as shown in FIG. 1, the first original 54 is placed at a position corresponding to the size displayed on the scale 61, 62 and the auxiliary display section, and then the second original 55 is placed on top of the first original. Place it along the edge of 54. Next, the division key 141 is turned on, the duplex key 145 is turned on, the number of copies is set using the numeric keypad 132, and the copy key 131t is turned on.

Then, the main processor group 71 determines that two A4-sized originals are to be divided into two-sided copies, and sends the result of this determination to the microcomputer 101. By the way, Microcomputer 101
By driving the motor 33, the first and second carriages 411, 41□ are caused to travel. At this time, the lighting of the exposure tube 4 is controlled by the main processor group 71.

As a result, the light from the exposure lamp 4 is irradiated onto the first original 54, and the reflected light from the first original 54 is reflected onto the mirror 5.
, 6, 7. The light then reaches a mirror 9 via a variable magnification lens block 8 which is set to 1.0x, is reflected by this mirror 9, and is guided to a photoreceptor drum 10. As a result, an electrostatic latent image of the first document 54 is formed on the photoreceptor drum 10, and this electrostatic latent image is moved by the rotation of the photoreceptor drum 10.
The image is sent to a developing device 12 and developed. At this time, the paper P from the paper feed cassette 13 is taken out and sent between the photosensitive drum 10 and the transfer charger 20 via the registration rollers 19. Here, the image on the photosensitive drum 10 is transferred onto the surface of the paper P by the action of the transfer charger 20, and after this transfer, it is peeled off by the action of the peeling charger 21. The paper P in this image transfer method is transported by a conveyor belt 22. The sheet is sent to a pair of fixing rollers 23, where the image is fixed, and is discharged by a pair of discharge rollers 24 and 24. The discharged paper P is guided to the paper introduction path 151 side by the gate 150 and fed in, and is once sent in the direction of arrow d by the rotation of the feed rollers 152 and 152, and then transferred to the feed roller 152.
．． 152 is reversely rotated and conveyed in the direction of arrow e, and is held and conveyed by conveyor bells 153 and 153. and,
This transport bell) 153° Paper P discharged from 153
is sent into the reversing path 154, reversed, and sent to the registration roller 19 side.

Next, the microcomputer 101 drives the motor 31 to set the variable magnification lens block 8 to the 1.02x position, and also drives the motor 33 to set the first and second carriages. 47. , 41. Back up a little and then start driving again. At this time, the second original 55 is irradiated with light from the exposure lamp 4. The reflected light from the second original 55 passes through the mirrors 5, 6.7, and the variable magnification lens block 8 set to 1.02 times, reaches the mirror 9, is reflected by the mirror 9, and is directed to the photoreceptor. drum 1
It leads to 0. As a result, an electrostatic latent image of the second document 55 is formed on the photoreceptor drum 10, and as the photoreceptor drum 10 rotates, this electrostatic latent image is sent to the developing device 12 and developed. . The developed image on this second original 55 is transferred to the photoreceptor drum 10 and the transfer charger 2 via the registration roller 19.
When introduced between the transfer charger 2o and the transfer charger 2o, the transfer charger 2o transfers the transfer charge onto the back side of the transfer charger 2o. Then, the image is fixed on the paper P on which the image has been transferred by the pair of fixing rollers 23 and 23, and then the paper P is discharged to the pair of discharge rollers 24 and 24.

Thereafter, double-sided copying is performed continuously for the number of copies.

When scanning of the original is completed, the mirror 5 is moved to point A (home position) shown in FIG. 1 and stopped.

The main part of the above operation is shown in the 15th flowchart.
It is as shown in the figure.

As mentioned above, the home position of mirror 5 is set to A.
Since the tab carriages 141 and 142 and the optical system 3 are placed on the side of the fulcrum 52, the carriage and the optical system do not fall when the apparatus is opened, and since their weight is near the fulcrum, The device opening/closing moment is small.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide an image forming apparatus that can reduce the opening/closing moment and prevent the optical system from falling.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view showing the overall configuration, FIG. 2 is a diagram for explaining the open/closed state, and FIG. 3 is a plan view showing the configuration of the operation panel. Fig. 4 is a perspective view showing an example of the configuration of the drive section, Fig. 5 is a perspective view schematically showing the moving mechanism of the optical system, and Figs. 6 and 7 show the movement mechanism of the document table and the optical system. 8 is a diagram showing the configuration of the auxiliary display section, FIG. 9 is a configuration diagram of the overall control circuit, FIG. 10 is a configuration diagram of the main processor group, and FIG. 11 is a diagram showing the configuration of the first sub-display unit. A configuration diagram of the processor group, FIG. 12 is a configuration diagram of the second subgrocer group, FIG. 13 is a schematic configuration diagram showing the control circuit of the gurus motor, and FIG. 14 is a diagram illustrating the speed control method of the pulse motor. , FIG. 15 is a flowchart showing the main parts of the operation. 1...Main body, 1□...Upper unit, 1□...Lower unit, 2...Document stand, 3...Optical system, 5, 6
, 7° 9... Mirror, 8... Lens block for variable magnification, 1°... Photosensitive drum, P... Paper (image forming body), 13... Upper paper feed cassette, 14 ...Lower paper feed cassette, 301.30□...Cassette size detection switch, 3rd...Lens motor, 32...Mirror motor, 33...Scanning motor, 411...No. 1st carriage, 412...2nd carriage, 5th...
・Paper transport path, 52... Support shaft (fulcrum), 53... Opening/closing mechanism, 54... First original, 55... Second original, 56... Book, 61.62. ...Scale, 63...
- Auxiliary display section, 71... Main processor group, 91,
101...Microcomputer, 131...Copy key, 135
...Upper cassette selection key, 137...Lower cassette selection key, 141...Division key, 143...Release key, 145...Double-sided key, 147...Release key, 15
o... Dirt, 151... Introduction path, 152... Feed roller pair, 153... Conveyance belt, 154... Reverse path. Applicant's representative Patent attorney Takehiko Suzue Figure 14 Figure 15

Claims (1)

[Claims] an optical system that optically scans a document by moving relative to the document held on a fixedly supported document table;
a moving mechanism for moving this optical system, the main body is divided into two units, a first unit having the optical system and a second unit, and the first unit is centered on a fulcrum with respect to the second unit. 1. An image forming apparatus whose main body is opened and closed by rotationally displacing the optical system, wherein a home position of the optical system is configured on the fulcrum side.