JPS6247634A - Image forming device - Google Patents

Abstract

PURPOSE:To use an image forming device with a desired set reference by selecting the center part or one side of an original platen as the set reference of an original on a console panel and moving a lens according to variable magnification and form size. CONSTITUTION:A set reference setting key 30 is operated to select the center part or one side of the fixed scale 2x of the original platen 1 as the set reference of an original. When the center part is selected as the set reference, the center of the original G coincides with the center of a form P, so a lens block is moved in a (y) direction according to copying magnification. Further, when the one side is selected, on the other hand, the lens block is moved in both (x) and (y) directions by a movement quantity stored previously a ROM according to variable magnification and form size to form an image with the desired original placing reference.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus applied to, for example, an electronic copying machine.

[Technical background of the invention and its problems]

As is well known, some electronic copying machines have a document set at the center of the document table, and others set the document on one side of the document table. Since the setting standards for these originals are fixed by the copying machine, it is fine if the user uses a copying machine with which the setting standards are familiar, but if not, it may be difficult to use because the setting standards are different from normal ones. There is,
In some cases, there is a problem in that a copying error occurs, such as an image being formed only on a portion of the paper.

[Object of the invention] This invention was made based on the above circumstances,
The purpose is to provide an image forming apparatus that allows originals to be set according to familiar standards, prevents copying errors, and that can supply transfer materials with high precision. It is something.

[Summary of the invention]

The present invention makes it possible for the user to move, for example, a variable magnification lens block along a fixed scale that serves as a reference for setting an original, and to move an image formed on a sheet of paper supplied with a center reference. This allows the document setting standard to be selected as required, and in particular, the paper is fed using a pickup roller located at the widthwise center of the paper feed cassette. .

[Embodiments of the invention]

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

FIGS. 4 and 5 schematically show the image forming apparatus of the present invention, for example, the copying mode. 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 document table 2 is provided with fixed scales 2X and 2y (the fixed scale 2y is shown in FIG. 1) along the width direction and the length direction of the document table, respectively, each indicating a document setting reference. Near the table 2, a document cover 11 and a work table 12, which can be opened and closed, are provided. The original placed on the original platen 2 is moved back and forth by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7 along the lower surface of the original platen 2 in the direction of arrow a. It is designed to be exposed and scanned. In this case, mirror 6.7 moves at half the speed of mirror 5 so as to maintain the optical exposure length. The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the exposure lamp 4, is reflected by the mirror 5.6.7, passes through the variable magnification lens block 8, and then passes through the mirror. 9 and guided to the photoreceptor drum 10, so that an image of the document is formed on the surface of the photoreceptor drum 10.

The photosensitive drum 10 rotates in the direction of arrow C in the figure, and the surface is first charged by a charging device 11, and then an image is exposed to slit light to form an electrostatic latent image on the surface. This electrostatic latent layer is made visible by applying toner to it by a developing device 12.

On the other hand, the paper (material to be transferred) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the feed roller group 15 or 16, passes through the paper guide path 17 or 18, and passes through the registration rollers. It is guided to a pair of registration rollers 19, and guided to a transfer section by this pair of registration rollers 19. Here, the paper feed cassettes 13 and 14 are removably provided at the lower right end of the main body 1, and one of them can be selected from an operation panel to be described later. Each of the paper feed cassettes 13 and 14 has a cassette size detection switch 6.
The cassette size is detected by 01.602. This cassette size detection switch 60s, 6
02 is composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

The paper P sent to the transfer section comes into close contact with the surface of the photoreceptor drum 1o at the transfer charger 20, so that the toner image on the photoreceptor drum 10 is transferred by the action of the charger 20. . This transferred paper P is transferred to the peeling charger 2
1, the image is electrostatically peeled off from the photoreceptor drum 10 and conveyed by a conveyor belt 22, and is sent to a fixing roller 23 as a fixing device provided at the end of the conveyor belt 22, where the transferred image is transferred. It will be established. Then, paper P after fixing
is arranged to be placed on a tray 25 outside the main body 1 by a pair of paper ejection rollers 24. After the photosensitive drum 10 has been transferred, the charge is removed by the charger 26 for weight removal, residual toner on the surface is removed by the cleaner 27, and the afterimage is erased by the charge removal lamp 28, so that the drum 10 returns to its initial state. It looks like this. Two cooling fans are used to prevent the temperature inside the main body 1 from rising.

FIG. 6 shows the operation panel 30 provided on the main body 1. 301 is a copy key for instructing the start of copying; 302
is a numeric keypad for setting the number of copies, etc., 303 is a display unit that displays the operating status of each part and paper jams, etc., 304 is a cassette selection key for selecting upper and lower paper feed power sets 13 and 14, and 30s is a selected key. A cassette display section for displaying the cassette, 306 a magnification setting key for setting the enlargement and reduction magnification of copies in a predetermined relationship, 307 a zoom key for steplessly setting the enlargement and reduction magnification, and 30a for displaying the set magnification. A display section 309 is a density setting section for setting copy density. Reference numerals 30a and 30b are document setting standard setting keys, and 30C130d is a light emitting display element indicating that the setting standard setting key 30a130b has been operated.

FIG. 7 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 that performs magnification change. 32 is a mirror motor, and the distance I between the mirror 5 and the mirror 6.7 is used to change the magnification.
This is a motor for changing I (optical path length). 33 is a scanning motor, which connects the exposure lamp 4 and mirror 5.
, a motor for moving the mirror 6.7 for document scanning. A shutter motor 34 is a motor for moving a shutter (not shown) for adjusting the charging width of the photosensitive drum 10 by the charger 11 during zooming.

Reference numeral 35 denotes a developing motor, which is a motor for driving the image bearing roller of the developing device 12 and the like.

36 is a drum motor, which is a motor for driving the photosensitive drum 10. Reference numeral 37 denotes a fixing motor, which is a motor for driving the paper conveyance path 22, the pair of fixing rollers 23, and the pair of paper discharge rollers 24. Reference numeral 38 denotes a paper feeding motor, which is a motor for driving the feed roller groups 15 and 16. A paper feeding motor 39 is a motor for driving the registration roller pair 19. 40 is a fan motor, and the cooling fan 2
This is a motor for driving 9.

FIG. 8 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by the seventh carriage 411, and the mirror 6.7 is supported by the second carriage 422, respectively, and these carriages 411 and 412 are guided by guide rails 42t and 422 in the direction of arrow a. It can be moved in parallel. That is, 4
Phase pulse motor 33 drives pulley 43. An endless belt 45 is connected between the pulley 43 and the idler pulley 44.
The mirror 5 is placed in the middle of this belt 45.
One end of the first carriage 411 that supports the is fixed. On the other hand, the second carriage 42 supporting the mirror 6.7
Two pulleys 47.47 are rotatably provided on the second guide 81146 at a distance in the axial direction of the rail 422, and a wire 48 is passed between these pulleys 47.47. One end of this wire 48 is fixed to a fixing part 49, and the other end is fixed to the fixing part 49 via a coil spring 50. Also, a first carriage 41 is located in the middle of the wire 48! One end is fixed. Therefore, as the pulse motor 33 rotates, the belt 45 rotates, the first carriage 411 moves, and the second carriage 422 also moves accordingly. At this time, since the pulleys 47 and 47 serve as movable pulleys, the second carriage 422 is 1/2 of the first carriage 41''.
move in the same direction at a speed of Note that the moving directions of the first and second carriages 411 and 412 are controlled by switching the rotational direction of the pulse motor 33.

FIG. 9 shows a driving mechanism for the variable magnification lens block 8. As shown in FIG. The motor 31 is adapted to rotate a lead screw 61 disposed in the moving direction (y direction) of the first carriage 411. Bush 6
31 and 632 are screwed together, and the lead screw 61
When the is rotated, the substrate 62 is moved in the y direction.

A guide member 621 is provided at the other end of the substrate 62, and the guide member 621 is slidably engaged with the guide rail 64. Further, the substrate 62 includes a substrate 62 .
A movable body 65 is provided, which is movable in a direction perpendicular to (x direction) and to which the variable magnification lens block 8 is attached. That is, supports 651. are provided at both ends of the moving body 65.
652 are provided, and these supports 651, 652 are guided and held by guide members 661, 662 provided on the base plate 62. Further, a rack 653 is provided on the longitudinal side surface of the support body 651, and a pinion 68 rotated by a pulse motor 67 provided on the base plate 62 is meshed with this rack 653. Therefore, the variable power lens block 8 is moved in the X direction by driving the motor 67. In addition, the micro switches 691 and 692 are connected to the substrate 62 and the moving body 6, respectively.
This is to detect the initial position of No. 5.

Next, the relationship between the operation of the variable magnification lens block 8 and the image formed will be explained. In FIG. 10(a), the focal length of the variable power lens block 8 is f, the optical path length from the document table 2 to the variable power lens block 8 is ya, and from the variable power lens block 8 to the photosensitive drum 10. When the optical path length is yb1 and the total optical path length from the document table 2 to the photosensitive drum 10 is yc, the optical formula is expressed as follows.

1/f=1/"y'a+1/yb Also, the magnification is expressed as = Vb/Va. Since the focal length f of the variable power lens block 8 is constant, the focus must be adjusted during variable power. It can be seen that in addition to changing the total optical path length yc, it is also necessary to change ya or yb.These ya and yb can be changed by moving the variable magnification lens block 8 in the y direction. Further, the total optical path length yc can be changed by moving the second carriage 412 and changing the position of the mirror 6.7.

On the other hand, as shown in FIG. 10(b), each distance between the document table 2, the lens block 8 for variable magnification, and the photosensitive drum 10 is fixed, and the lens block 8 for variable magnification is moved in the X direction by a motor 67, for example, by a distance Xi. , the image on the photosensitive drum 10 is moved by a distance x 2 expressed by the following equation.

x2-XI xyb/ya In addition, in the case of a same size copy, it becomes X2-2)1. In this way, by moving the variable magnification lens block 8 in the X direction, the center of the copied image can be moved.

FIG. 11 shows the overall control circuit, showing the main processor group 71 and the first . Second sub-processor group 72.
It is mainly composed of 73. The main processor group 7
Reference numeral 1 denotes a high-voltage transformer 76 that detects input from an input device 75 such as an operation panel 30 and various switches and sensors, such as the cassette size detection switch 601 and 602, and drives the various chargers, the static elimination lamp 28, and the The blade solenoid 27a1 of the cleaner 27 controls the heater 23a of the fixing roller pair 23, the exposure lamp 4, each of the motors 31 to 40, 38, etc. to perform the copying operation, and also controls the motor 67. This is to perform a movement operation of the original image corresponding to the original setting standard, which will be described later.

Among the motors 31 to 40.67, motor 35.37
．． A toner motor 77 that supplies toner to the developer 40 and the developing device 12 is controlled by the main processor group 71 via a motor driver 78, and the motors 31 to 34 and 67 are controlled by the first sub processor group via a pulse motor driver 79. The motors 36, 39, and 38 are controlled by the second sub-processor group 7 through a pulse motor driver 80.
VL (company) was established in 3. Further, the exposure lamp 4 is controlled by the main processor group 71 via the lamp regulator 81, and the heater 23a is controlled by the main processor group 71 via the heater control section 82. From the main processor group 71 to the first and second sub-processor groups 72 and 73,
Commands to drive and stop each motor are sent to the first motor. From the second sub-processor group 72 and 73 to the main processor group 71
A status signal indicating the drive/stop state of each motor is sent to the motor. 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 34.67.

FIG. 12 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer), which detects human input of keys on an operation panel (not shown) and controls various displays via an input/output board 92. Further, the microcomputer 91 is expanded by input/output ports 93-96. A high voltage transformer 76, a motor driver 78, a lamp regulator 81, and other outputs are connected to the input/output boat 93. A size switch for detecting paper size and other inputs are connected to the input/output boat 94. A copy condition setting switch and other inputs are connected to 95.

Note that the input/output port 96 is an option.

FIG. 13 shows an example of the configuration of the first sub-processor group 72. That is, 101 is a microcomputer, which is connected to the main processor group 71.

102 is a programmable interval timer for controlling the phase switching interval time of the pulse motor;
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. Said timer 10
2, a reference clock pulse is input. Furthermore, the microcomputer 101 receives position information from the position sensor 83 and is connected to input/output boats 103 and 104. The input/output boat 104 is connected to the motors 31 to 31 through the pulse motor driver 79.
34.67 is connected. In addition, the input/output boat 1
03 is used, for example, when outputting the status signal of each pulse motor to the main processor group 71.

FIG. 14 shows the configuration of the second sub-build O setter group 73. That is, 111 is a microcomputer, which is connected to the main processor group 71.

112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor;
By setting a set value from 1, it counts based on it, and outputs an end pulse when the count is out. This end 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 boat 114 is connected to the microcomputer 111, and motors 36, 38, and 39 are connected to the input/output boat 114 via the pulse motor driver 80.

Figure 15 shows the control circuit of the pulse motor.
The input/output boat 121 (corresponding to the input/output boats 104 and 114 in Figs. 13 and 14) has a pulse motor driver 1.
22 (corresponding to the pulse motor driver 79.80 in FIG. 11) is connected to the pulse motor driver 122,
．． 38, 39, and 67) are connected to each other.

FIG. 16 shows a method for controlling the speed of a pulse motor. FIG. 5A shows the speed curve of the pulse motor, and FIG. 1B shows the phase switching interval.

As is clear from this figure, the phase switching interval is long at the beginning;
They gradually shorten, eventually become evenly spaced, then gradually lengthen again and stop. In other words, this indicates the slew-up and slew-down of the pulse motor, starting from the self-starting region, being used in the ^ speed region, and finally falling. Note that tl, t2, . . . , tx indicate the time interval of m intervals.

Next, the aforementioned delivery roller groups 15 and 16 will be explained. As shown in FIG. 17, the feed roller groups 15, 16 respectively transmit the power supplied to the pickup rollers 151, -161, the paper feed roller 152, 162, the separation row 5153, 16, and the paper feed roller 152, 162. Pulley 154.transmitted to pickup roller 151.16t.
164, belt 15s, 15's, 16s, 16
It is composed of s, etc. The pickup roller 151.16t, paper feed roller 152.162, and separation roller 153.163 are arranged so that the center of each roller 151.161.152.162.153.163 is located at the paper feed cassette 13. It is located at the center in the width direction of the paper P housed in the paper sheet 14. Therefore, when taking out the paper, skew (rotation in a direction parallel to the surface of the paper) is unlikely to occur in the paper.

Further, the pickup roller 151.16e and the paper feed roller 152.162 are driven to rotate in the same direction at the same timing, and the separation roller 153.
163 is driven to rotate in the opposite direction to the paper feed rollers 152 and 162. In addition, separation roller 153.1
63, as shown in FIG. 19, each of the paper feed rollers 1
52.162, and the drive shaft 158.16+ via a spring clutch 157.167.
Furthermore, weights 15a and 16a are provided on the shafts 15s and 16s of the paper feed rollers 152 and 162.

The thus configured delivery roller group 15,16 is operated as follows. Note that since the feed roller groups 15 and 16 have the same configuration, only the feed roller 15 will be described.

When the copy key 301 is operated, the pickup roller 15! , the paper feed roller 152, and the separation roller 153 are rotated in the aforementioned directions. Here, pick up roller 1
51, as shown in FIG. Since the separation roller 153 is set to be stronger than the force, the separation roller 153 is rotated in the direction of the arrow S1 shown in the figure as the paper P1 is conveyed, and the paper P1 is conveyed in the direction of the force indicated by the arrow Sf in the figure.

On the other hand, when two sheets of paper Pl and P2 are taken out by the pickup roller 151 and are fed between the paper feed roller 152 and the separation roller 153 in an overlapping state, the adsorption force between the paper sheets Since the driving force of each roller 152 and 153 is set to be stronger than , it is conveyed in the direction of the force indicated by the arrow sb. Therefore, the two sheets of paper P1 and P
2 are separated.

Next, the gist of the invention will be explained.

In this invention, the setting key 30a is set such that the reference for setting the original is at the center of the fixed scale 2x of the original table 2, or on one side of the fixed scale 2X.

30b, the paper is fed with reference to the center of the fixed scale 2x of the document table 2, and
As mentioned above, each roller 151, 161 is placed in the center of the paper.
．． 152.162.153.163 are located.

In the above configuration, the operation will be explained. When the document setting standard setting key 30a of the operation panel 30 is operated, the document setting standard is set to the center of the fixed scale 2x. In this case, if the copy magnification is set to the same magnification as shown in FIG. 1(a), or if the reduced magnification is set as shown in FIG. Since the centers of P coincide, the variable magnification lens block 8 is moved in the X direction shown in FIG.

On the other hand, in the above state, when the document setting standard setting key 30b is operated, the document setting standard is set to the fixed scale 2y. In this case, as shown in FIGS. 1(c) and 1(d), the center of the document and the center of the paper P do not match even if the copying magnification is equal or reduced. Therefore, the variable magnification lens block 8 is moved in the X direction and the X direction according to the copy magnification set by the magnification setting key 306 and the paper size selected by the cassette selection key 304.

That is, the amount of movement of the variable magnification lens block 8 is determined as follows. As shown in Figure 2, the distance from the center of the document table 2 to one end of the fixed scale 2x is Xα, the length from the center of the paper P to one end is X2 (-P/2), and the set magnification The moving distance of the variable magnification lens block 8 according to The angle between the line connecting the centers and the optical axis of the variable magnification lens block 8 shown by the solid line is θ,
A variable magnification lens block 8, document table 2, and paper P are shown by dotted lines.
Letting the distance from the lens block 8 to
b=1/f The magnification ratio is K=b/a. Solving the above equation reveals that it is expressed by the relationship x=F (K, x(4, f, P). Here, x6,
Since f is a constant determined by the copying machine, the above equation can be transformed into x-F (K, P). That is, it can be seen that the moving distance X of the variable magnification lens block 8 along the fixed scale 2x is determined by the variable magnification ratio and the paper size. Once the magnification ratio and paper size are set, the transformation lens block 8 can be moved a.
m can be found. In order to move the variable magnification lens block 8, the number of pulses corresponding to x-F(K, P) is stored in a storage unit such as a ROM, and the variable magnification K and paper size P are input. In this case, the stored number of pulses is read out in accordance with this input information, and the motor 67 is driven in accordance with this number of pulses,
The above equation may be calculated each time.

FIG. 3 shows the operating state of the variable magnification lens block 8 according to the document set position, copy magnification, and paper size. FIG. 5A shows a case where a document G having a width of G2 is set as a center reference and a same size copy is made on a sheet P having a width of P2.

In the same figure (b), original G with width 03 is used as one side reference, and width is P.
This shows the case of copying at the same size on No. 3 paper P. FIG. 2C shows a case where an original G having a width of G4 is used as a reference on one side and an enlarged copy is made onto a sheet P having a width of P4. The same figure (d
) shows the case where an original G with a width of G5 is used as a reference on one side and an enlarged copy is made on a paper P with a width of P5.

According to the embodiment described above, setting reference setting keys 30a and 30b for specifying the document setting position are provided, so that the user can specify the document setting position as required. Therefore, since it is possible to perform copying at a familiar original setting position, it is possible to prevent copying errors due to incorrect setting of the original.

In addition, the variable magnification lens block 8 is made movable in accordance with the operation of the document cellar/standard setting keys 30a, 30b, the magnification setting key 30s, and the cassette selection key 304, so that the image is always formed in the center of the paper. I have to. Therefore, even if the document setting standard changes, the paper can be sent out with the center standard, and there is no need to replace the cassette.

Furthermore, the setting reference for the paper P corresponds to the center of the fixed scale 2x, and the pickup rollers 151 and 161 of the feed roller group 15 and 16, and the paper feed rollers 152 and 162
, separation rollers 153 and 163 are positioned at the center of the paper.

Therefore, the supplied paper is unlikely to be skewed, and the reliability of paper feeding is high.

Note that this invention is not limited to the above embodiments,
Of course, various modifications can be made without departing from the gist.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to set the original according to familiar standards, prevent copying errors, and improve the supply of the transfer material. It is possible to provide an image forming apparatus that can perform image forming with high precision.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the image forming apparatus according to the present invention, and FIG. 2 is a partially cutaway plan view of only the main part showing the position where a document is set, and FIG. 2 is a plan view for explaining the moving state of the lens. 3 is a schematic configuration diagram shown to explain the movement state of the lens in various setting states, and FIGS. 4 and 5 show the configuration of the image forming apparatus.
Fig. 4 is an external perspective view, Fig. 5 is a side sectional view, Fig. 6 is a plan view showing the configuration of the operation panel, Fig. 7 is a perspective view showing the configuration of the drive section, and Fig. 8 is the drive of the optical system. FIG. 9 is a perspective view schematically showing the mechanism, and FIG. 9 is a perspective view showing the configuration of the variable power lens block, showing only the main parts. FIG. 10 is a perspective view showing the operation of the variable power lens block and the image formed. FIG. 11 is a block diagram showing the overall control circuit, FIG. 12 is a block diagram of the main processor group, FIG. 13 is a block diagram of the first sub-processor group, and FIG. 14 is a block diagram of the second sub-processor group. A configuration diagram of the sub-processor group, FIG. 15 is a schematic configuration diagram showing the control circuit of the pulse motor, FIG. 16 is a diagram for explaining the speed control method of the pulse motor, and FIGS. 17 to 19 are the delivery roller group. Fig. 17 is a side view of the main part, Fig. 18 is a plan view of the main part, Fig. 19 is a perspective view of the main part, and Fig. 20 is a diagram for explaining the operation of the delivery roller group. It is a side view of the important part shown. 1... Main body, 2... Original table, 2x, 2y... Fixed scale, 8... Lens block for variable magnification, 1o...
Photosensitive drum, 15.16... Delivery roller group, 151
．． 161...Pickup roller, 152,162.
・・Paper feed roller, 153.16 yo・・Separation roller, 3
゜...Operation panel, 30a, 30b...Set standard setting key, 71...Main processor group. Applicant's agent Patent attorney Takehiko Suzue-T- (a) Figure 1 LJ ¥ & 1 Figure jO (C) U (d) Figure 2 32 G2 (a) Figure 3-(3p G 3 (b) Figure 13 Also ℃偕 (C) Figure 3 also η1 (d) Figure 3 Figure 4 Figure 7 Figure 9 Figure 15 Figure 17 @

Claims (1)

[Claims] A scanning device that moves along a document table and optically scans a document placed on the document table in accordance with a setting reference of the document table, and an image corresponding to the document image guided by the scanning device is formed. In an image forming apparatus comprising an image carrier and a transfer means for transferring an image formed on the image carrier to a supplied material to be transferred, a delivery roller that is in contact with a central portion in the width direction of the material to be transferred; a supply means that is made up of a separation roller and supplies a transfer material in accordance with the center of the document setting reference; a changing means that is movable along the document setting reference and changes the imaging position of the image on the image carrier; An image forming apparatus comprising: a setting means for setting the document setting reference to the center or one side of the document table; and a control means for operating the changing means in accordance with the setting of the setting means.