JPH04112268U - Image forming device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an image forming apparatus that can be made more compact by minimizing wasted space. [Structure] Image information that is continuously formed as a visible image on the photoreceptor 90 via the writing optical system and the image forming system is transferred to the first and second images.
Transfer stations 231 and 232 transfer the image onto a plurality of different transfer papers P1 and P2. At this time, before the transfer paper P2 is carried into the second transfer station 232, it enters a standby state in order to adjust the timing between the image information on the photoreceptor 90 and the transfer paper P2. At this time, the transfer paper P2 is transferred to the transfer paper stack section 2.
11, the stack portion is deformed along the slope. Due to this deformation, the planar projected dimension of the transfer paper P2 in the transport direction during standby becomes smaller, and the image forming apparatus can be made smaller by that amount. Note that by pressing the transfer paper P2 with the elastic member 208, the transfer paper P2 can be reliably deformed along the slope of the transfer paper stack portion 211.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is useful for printing large numbers of images, as exemplified by copiers, laser printers, etc. This relates to image forming apparatuses that perform image forming, especially those that have characteristics in the conveyance path of the recording medium. The present invention relates to an image forming apparatus.

0002

[Conventional technology]

For example, in an image forming device that uses electrophotography, an image is generally printed on a photoreceptor once. Form an image and transfer the formed image each time to transfer the image onto the transfer medium. It is designed to form a Therefore, there is a limit to the image forming speed. It was. Therefore, we can overcome this limitation and increase the productivity of image formation, such as copying. Various proposals have been made for this purpose.

0003 One of these techniques is disclosed in Japanese Patent Application Laid-Open No. 61-7855. This technology , an electrostatic latent image of the same original (original) is deposited on one photoconductor in one exposure process. It is constructed to improve copying productivity by forming two copies at the same time. There is. This technology also uses a transfer method to improve the productivity of double-sided copying. Two transfer means are provided, and each transfer means is operated continuously to perform double-sided copying. Ru.

0004 In addition, as another technique, the technique disclosed in Japanese Patent Application Laid-Open No. 55-163549 There is. This technique uses electrostatic charges against the same original (manuscript) on two photoconductors. Improves copying productivity by forming two latent images at the same time in one exposure process. It is configured to

[0005] However, in the above-mentioned conventional technology, the hard information from the same original, that is, the manuscript, Two electrostatic latent images corresponding to software information are simultaneously formed from the image signal in one exposure process. In order to A special optical system is required compared to the case where the Specifically, parts such as lenses and mirrors There are many of them, and the structure is complicated, leading to an increase in costs. Also, in the above structure Although productivity has increased, it is still insufficient.

[0006] Therefore, when thinking about increasing productivity, it is necessary to is conveyed and discharged by the image forming apparatus without any gaps between them. In other words, the A method of forming an image by conveying and ejecting recording sheets with no gaps between them. is possible.

[0007] As a method for transporting and ejecting recording sheets within an image forming apparatus without paper gaps. eliminates the interval between electrostatic latent images of image information formed on the photoconductor, which is a photoreceptor. I can think of something to do. However, it is disclosed in Japanese Patent Application Laid-open No. 61-7855. In copying productivity improvement technology, the distance between electrostatic latent images formed on the photoreceptor is increased to some extent. This creates gaps between successive recording sheets, resulting in poor results. However, copying productivity decreases accordingly.

[0008] This can be achieved by full exposure like this known technique or by well known slit exposure. This is because there is a limit to reducing the distance between electrostatic latent images in the analog optical system. This is true even for digital optical systems that use laser beams, for example. If it does not have a storage means to temporarily store image information, it is an analog method. Similarly, there is a limit to reducing the distance between electrostatic latent images.

[0009] Furthermore, even if it is possible to eliminate the interval between electrostatic latent images in image information, a certain length of Continuously cut recording sheets from the recording sheet storage section without paper gaps. The leading edge of each fed memory sheet coincides with the leading edge of the electrostatic latent image. The recording sheet feeding/conveying means and feeding/conveying method that makes it possible to However, the well-known feeding means and methods in this prior art do not allow recording. It is not possible to feed and convey sheets without paper gaps. Therefore, the above method is perfectly executed. It has not yet reached the point where it can be done.

0010 On the other hand, the copying productivity improvement technology disclosed in Japanese Patent Application Laid-Open No. 55-163549 is Although it is promising to implement the above method in the field of composite and multicolor copying, At least two or more sets of process means surrounding the photoreceptor and photoreceptor are required. This inevitably leads to high costs, and due to the configuration of the paper conveyance path, there are three There is a considerable gap between the first and later recording sheets, which reduces copying productivity. descend.

[0011]

[Problem that the idea aims to solve]

Therefore, in order to increase copy productivity, multiple images can be printed on a single image information storage medium. The images are then transferred to a recording medium by separate image information transfer means. It is conceivable to perform image formation. In this case, the recording medium is transported from the same position. Otherwise, if a paper feed device is installed for each different image information transfer means, the device will become too large. The cost will be very high. Therefore, only the conveyance path is used as an image information transfer means. It is necessary to provide a paper feed section such as a paper feed tray so that only one paper feed section is required. Also, If the conveyance path is not made as short as possible, not only will the equipment become larger, but the processing speed will be reduced. It's also late.

0012 On the other hand, the recording medium is transported from one paper feed section to two image information transfer means sides. When the image information is formed on the image information holding medium, the timing of the recording medium Because of this need, it is necessary to keep the recording medium waiting in the transport path. There is. In this way, when the recording medium is in standby mode, The area to be stored for storage must be at least as long as the transport path of the recording medium. This results in wasted space within the image forming apparatus.

[0013] This idea was made in view of the actual state of the prior art, and its purpose was to , provides an image forming device that can be made more compact by minimizing wasted space. It's about doing.

[0014]

[Means to solve the problem]

In order to achieve the above object, this invention aims to Information is transferred and recorded from an image information holding medium to a recording medium using an image information transfer means. In an image forming apparatus that forms an image on a medium, one image information holding medium and a front an image information forming means for continuously forming image information on one image information holding medium; , records the image information formed on the image information holding medium by the image information forming means; A first image information transfer means on the upstream side in the recording medium conveyance direction that continuously transfers onto the recording medium; and a second image information transfer means on the downstream side, and the recording medium is continuously transferred along the conveyance path. a recording medium conveyance means for conveying to the first and second image information transfer means, respectively; Recording medium storage consisting of slopes with different inclination angles provided in front of the image information transfer means of No. 2 It is structured with a section.

[0015] In this case, the recording medium is placed in the recording medium storage section on the recording medium placement surface of the storage section. It is preferable to further provide a pressing means for pressing.

[0016]

[Effect]

According to the above means, the image information forming means (909) is formed on the image information holding medium (90). , 950), the image information continuously formed as a visible image is The first and second image information transfer means (231, 232) The images are transferred to recording media (P1, P2). After the transfer, the image is placed on the fixing means (190) side. transported. At that time, the recording medium (P2) is transferred to the second image information transfer means (232). Before being carried in, the image information on the image information holding medium (90) and the recording medium (P2) are It goes into standby mode to get the timing right. At this time, the recording medium (P2) is It deforms along the slope in the body storage part (211). With this transformation, the recording medium (P2 ), the plane projection dimension in the transport direction becomes smaller during standby, and the image forming device can be made smaller accordingly. Can be molded. Note that the recording medium (P2) is not pushed onto the recording medium placement surface of the storage section (211). If the pressing means (208) is provided to press the recording medium (P2), it is ensured that the recording medium (P2) is stored in the storage medium. Since it is deformed along the slope of the portion (211), the planar projection dimension of the recording medium (P2) is can be defined reliably.

[0017] In addition, this effect is specifically caused by (8) the transfer system and (9) the operation timing. This is explained in detail in the section on

[0018]

【Example】

Examples of the present invention will be described below.

[0019] (1) Overall overview First, an overall overview of the copying machine according to the embodiment will be described.

[0020] FIGS. 1 and 2 show schematic configuration diagrams of a copying machine according to an embodiment. Figure 1 shows the first transfer stage. The configuration of both the transfer station and the second transfer station is shown when corona discharge is performed. Figure 2 shows that the first transfer station uses corona discharge and the second transfer station uses belt transfer. The configuration when photographed is shown.

[0021] In FIG. 1, the copying apparatus uses a laser beam reflected by a polygon mirror 63. a writing optical system 909 that leads to a belt-shaped photoreceptor (hereinafter simply referred to as photoreceptor) 90; Developing the latent image written by the writing optical system 909 and formed on the photoreceptor 90 A developing section 910, a first transfer for transferring the developed image developed by the developing section 910 onto transfer paper; A copying station 231, a first station for separating the transfer paper on which the image has been transferred from the photoreceptor 90; Separate charger 100, a transfer paper different from the transfer paper transferred at the first transfer station 231. A second transfer station 232 further transfers the image to the transfer paper, and the image is transferred to the transfer paper to which the image has been transferred. a fixing section 190 that fixes the image, and a cleaning section that cleans the photoreceptor 90 after transferring the image. 920, a static eliminator 930 that neutralizes the photoconductor 90 after cleaning; a charging unit that charges the photoreceptor 90 after static neutralization; An image forming system 950 consisting of a charger 940 and a transfer paper supplied to the image forming system 950 , and a transport system 960 for the transfer paper to be discharged.

[0022] The conveyance system 960 transports the transfer paper between the first transfer station 231 and the second transfer station. 232, the transfer sheets can be conveyed alternately. For details, see below. The operation will be explained in the photo system section.

[0023] In this embodiment of FIG. 1, the second transfer station 232 is of the known belt transfer type. It is set in the transcription structure. On the other hand, in the embodiment of FIG. 232 is only set to corona transfer type, all other parts are implemented as shown in Figure 1. Since they are the same as the example, their explanation will be omitted.

[0024] This device includes: (A) Development transfer system with no latent image gap (B) 1 latent image (development) 2 transfer system (C) Normal mode transfer Since there are three types of modes, an overview of each type will be explained below.

[0025] Furthermore, before explaining each transfer system, the image forming system will be explained. (made by The image process is the same as the conventional known process. ) (2) Imaging system (2-1) Optical system The optical system of this mechanism is removable and uses digital and analog optical systems. It can also be used as an online printer (without a reader). It is usable.

[0026] (2-1-1) About digital optical system FIG. 3 shows the structure of the scanner section, and FIG. 4 shows the structure of the scanner drive section.

[0027] The light emitted from the fluorescent lamp 51 hits the original and passes from the first mirror 52 to the second mirror 53 to the third mirror. The light passes through the mirror 54 → lens 55 and reaches the CCD in the image reading plate 56 . fluorescent light 51 and a first mirror 52, a first scanner 57 reads the original. and is driven by a scanner motor 58. The image of the manuscript read by Scanana is It is reduced by a lens 55 and imaged on the CCD. Pictures read by CCD Since the signal is an analog value, it is A/D converted and converted into a digital signal after image processing. It will be done. After image processing, the image information is generated by scanning a laser beam in the writing section. written on the photoreceptor in the form of a collection. Note that the second scanner 59 is a second mirror 53. and a third mirror 54. In addition, in FIG. 3, reference numeral 60 indicates a filter. , 61 is a contact glass on which the original is placed.

[0028] FIGS. 5(a) and 5(b) show the configuration of the writing section.

[0029] The writing section includes a laser diode unit (hereinafter referred to as LD unit) 62. , the laser beam is incident on the polygon mirror 63, the fθ lens 64, and the photoreceptor 65. It basically consists of a mirror 66. The rays emitted from the LD unit 62 The light passes through a cylinder lens 67 and is rotated at high speed by a polygon motor 68. The light is polarized by a polygon mirror 63 that is moved. Polarized laser light is fθ It enters the mirror 66 through the lens 64, is reflected by the mirror 66, and is exposed to the dust-proof glass 69. and enters the surface of the photoreceptor 65. However, the laser light at the start of main scanning is the same. The light enters the synchronization reflection plate 70, is guided to the synchronization detection plate 71, and is detected by the detection signal from this detection plate. Therefore, a synchronization signal in the main scanning direction is generated.

[0030] (2-1-2) About analog optical system Figure 6 shows the configuration of the analog optical system.

[0031] The configuration of the optical system drive section is the same as the digital scanner drive section shown in FIG.

[0032] The light emitted from the exposure lamp 72 hits the original and passes through the first mirror 52 → second mirror 53 → Third mirror 54 → lens 55 → fourth mirror 73 → photoconductor door via dustproof glass 69 It reaches the ram 65 and forms a latent image.

[0033] (2-2) Photoreceptor part The photoreceptor 90 has a belt-like shape (Figs. 1 and 2), and is used for the digital optical system. When using an analog optical system, the image area exposure process is used, and when an analog optical system is used, the background area exposure process is used. Rocess is a typical example. The photoreceptor 90 is charged by the corona discharge of the charging charger 940. It is charged uniformly and then illuminated with light using an optical system to lower the potential.

[0034] The electrostatic latent image thus formed is applied with toner by the developing section 910 and visualized. . applied to the charging charger 910 and the developing sleeve in the developing section 910 in this device. The bias applied can be changed.

[0035] The toner image visualized on the photoreceptor 90 is transferred to two transfer stations (first transfer station). transfer station 231, second transfer station 232), and fixing unit 190. After fixing, post-processing is performed and the paper is ejected. The photoreceptor 90 is removed by the cleaning section 920. After the toner is cleaned, the residual potential is removed by the static eliminator 930, and the toner can be used repeatedly. Ru.

[0036] (3) Image creation process (3-1) Image creation The imaging process is determined by the exposure process, so for each imaging process This will be explained in detail below.

[0037] (3-1-1) Image forming process during image area exposure As an example, we will explain the photoconductor surface potential and the case where the toner is negatively charged. do. This method is mainly used in digital copying machines.

[0038] Figure 7 shows the image forming potential and timing in this method, and Figure 8 shows the image forming mode. The relationship between control items and charging potential is shown.

[0039] (3-1-1-1) Imaging pattern in normal mode The photoreceptor is charged with -700V as shown by the solid line (7-1) in Figure 7, and the image area is It is exposed to light using a laser diode to form a latent image. The potential after exposure at this time is -100V It is. After that, development is performed to adhere toner to the exposed areas. At this time, the exposure part voltage The difference between the development bias of -100V and the development bias of -500V shown by the dashed line (7-2) is The potential becomes 400V. The toner is negatively charged and is Developed by being attached to the exposed area on the photoconductor using a negative bias. is carried out.

[0040] (3-1-1-2) 1 development 2 transfer (transfer from one development section to two transfer elements) Imaging pattern during photocopying Because it is necessary to increase the amount of adhesion during development (approximately double the amount of adhesion), the development potentiometer is It is necessary to enlarge the chall. Therefore, the developing bias is shown by the two-dot chain line (7-3). Change from -500V to -800V so that As a result, the development potential is It becomes 700V. However, in this case, the charging potential is lower than the developing bias of -800V. Therefore, the charging potential should be changed from -700V to 500V as shown by the chain line (7-4). Change to negative 1000V. Also, by changing the charging potential, the laser diode If the output of the laser diode is the same, the potential after exposure will be higher, so the output of the laser diode will be higher. The output is increased to increase the exposure amount and the potential after exposure is kept constant.

[0041] (3-1-2) Image forming process for non-image area exposure As an example, when the photoreceptor surface potential is a minor potential and the toner is positively charged, I will explain. This method is mainly used in analog copying machines.

[0042] Figure 9 shows the image forming potential and timing in this method, and Figure 10 shows the image forming mode. The relationship between control items and charging potential is shown.

[0043] (3-1-2-1) Imaging pattern in normal mode The photoreceptor is charged at -800V as shown by the solid line (9-1) in FIG. The image area is exposed to halogen light to form a latent image. Potential after exposure at this time The lowest value varies depending on the image, but is around -50V. Next, apply toner to the non-exposed areas. is applied and developed. At this time, the charging potential -800V and the dashed line (9-2) The difference between the developing biases shown and −400 V becomes the developing potential. Toner is a plus Due to charging, it is attracted by the potential difference between the charging potential and the developing bias.

[0044] (3-1-2-2) 1 development 2 transfer (transfer from one development section to two transfer elements) Imaging pattern during photocopying Similar to the image forming process during image area exposure mentioned above, it is necessary to increase the amount of adhesion. , the charging potential is -900V as indicated by the chain line (9-3), and the developing bias is indicated by the two-dot chain line. As shown in (9-4), it is set to -200V. This results in a lower development potential. The voltage becomes 700V. In addition, in order to increase the amount of adhesion, The linear velocity ratio of the engine is increased. This linear velocity ratio is conventionally about 3.3, but in this case it is about It is about 6.6, that is, about twice the conventional value.

[0045] (4) Transfer process The first transfer station 231 has a corona discharge, and the second transfer station 232 has a base. during root transfer (Fig. 1), the first transfer station 231, and the second transfer station. The transfer process is divided into two types: corona discharge (Fig. 2). Explain.

[0046] (4-1) Both the first transfer station 231 and the second transfer station 232 When in corona discharge configuration (4-1-1) Casing cleaning If the corona discharge is contaminated with paper dust or toner, the discharge state will be different, so the first transfer stage transfer charger casings of station 231 and second transfer station 232 Clean the area. Cleaning timing is when the power is turned on and when copying a specified number of sheets. After that, it is set to be performed at the end of the repeat.

[0047] (4-1-2) Measurement of distribution ratio; transfer drum of first transfer station 231 Initial current setting The total current from the transfer charger's corona discharge power pack and the transfer charger's By measuring the casing current, the distribution ratio and and drum current.

[0048] (4-1-3) Detection of paper condition environment As shown in the circuit diagram of FIG. 11, the corona discharger 3 of the first transfer station 231 A counter electrode 302 is provided near the transfer paper charged by 01, and the counter electrode 302 is used for detection. The output current value is converted into a voltage value by a current detection circuit 303 to determine the state of the transfer paper. Depending on the state of the transfer paper, the graph showing the characteristics of the transfer paper drum current and transfer efficiency shown in Fig. 12 The transfer drum current of the first transfer station 231 is determined from the rough.

[0049] (4-2) The first transfer station 231 discharges corona and the second transfer station When the link 232 is in the belt transfer configuration (4-2-1) Casing cleaning If the corona discharge is contaminated with paper dust or toner, the discharge state will be different, so the first transfer stage Clean the casing of the transfer charger in the section 231. 2nd transfer station Since the transfer charger of the transfer belt 232 is located below the transfer belt, cleaning is not performed. Na Please note that cleaning should be done when the power is turned on and when the specified number of copies have been copied. It is set.

[0050] (4-2-2) Measurement of distribution ratio The total current from the transfer charger's corona discharge power pack and the transfer charger's The casing current is transferred to the first transfer station 231 and the second transfer station 23. 2 to determine the distribution ratio.

[0051] (4-2-3) Initial setting of transfer drum current of first transfer station 231 Using a reflective optical sensor, the transfer efficiency of the first transfer station 231 is compared to the second transfer station 231. The first transfer step is calculated based on the belt transfer efficiency of station 232. The transfer drum current of the application 231 is determined. Note that Figure 13 shows the transfer belt in Figure 1. It is a schematic explanatory diagram of the surroundings, and shows the installation state of P sensors 21, 22, and 23. In this case, the first P sensor 21 is the belt-shaped photoreceptor 9 of the first transfer station 231. A second P sensor is placed at position A opposite to the transport roller 307 portion on the upstream side in the rotational direction of The sensor 22 is located on the downstream side in the rotational direction of the belt-shaped photoreceptor 90 of the second transfer station 232. The third P sensor 23 is located at the B position facing the conveyance roller 308 portion. at position C on the downstream side in the rotational direction of the second transfer station 232 of the route 233. is set up.

[0052] Here, the phases of calculating the transfer efficiency corresponding to the positions of the P sensors 21, 22, 23 are explained. Explain the difference.

[0053] (a) Using the first and second P sensors installed at position A and position B tree The amount of toner developed on the belt-shaped photoreceptor 90 is detected by the first P sensor 21 After that, the belt is transferred to the transfer belt 233 at the second transfer station 232, and the transfer is performed. The remaining amount of toner is detected by the second P sensor 22 and transferred to the second transfer station 232. Calculate the transfer efficiency of

[0054] (b) Using the first and third P sensors installed at the A and C positions tree Detection by the amount of toner developed on the belt-shaped photoreceptor 90 and the first P sensor 21 After that, the belt is transferred to the transfer belt 233 at the second transfer station 232, and the transfer is performed. The amount of toner transferred is detected by the third P sensor, and the transfer efficiency of the second transfer station 232 is determined. Calculate the rate.

[0055] (c) Using the second and third P sensors installed at the B and C positions tree The toner image developed on the belt-shaped photoreceptor 90 is transferred to the second transfer station 232. After belt transfer to the transfer belt 233, the second and third P sensors 22 and 23 Detect and calculate transfer efficiency.

[0056] Note that in calculating the transfer efficiency above, the toner concentration and sensor potential level in Figure 14 are used. Do this based on the graph shown. In this figure, LA, LB, and LC are the first and second and the levels of the third P sensors 21, 22, 23, MA, MB, MC The corresponding toner densities are shown respectively.

[0057] Toner density control is based on the transfer efficiency of the second transfer station 232 and the first transfer. From the relationship of the transfer efficiency of the copying station 231, the efficiency of the first transfer station 231 The transfer efficiency of the second transfer station 232 when is the target value (30 to 50%) The transfer drum current of the second transfer station 232 is varied to obtain the Ru.

Note that when the second and third P sensors 22 and 23 are arranged at the B and C positions in (c), the transfer efficiency of the second transfer station 232 is not calculated and both P sensors 22 and 23 are , 23 makes it possible to control the transfer efficiency of the second transfer station 232. For example, if you want to set it to 50%, this can be determined by comparing whether the detection levels of both P sensors 22 and 23 are equal. With this control, it is possible to eliminate errors in calculating the transfer efficiency due to the toner concentration M/A and the detection level V _SP /V _SG characteristics of the P sensor.

The toner concentration detection pattern of the first P sensor 21 at the A position in (a) and (b) is based on the sensitive one of the toner concentration M/A and the P sensor detection level V _SP /V _SG characteristics. To calculate within a range, use the intermediate concentration range.

[0060] In cases (a) and (b), calculate the transfer efficiency of the second transfer station 232. transfer at the second transfer station 232 by comparing the detection levels of the P sensor. Efficiency can be controlled. For example, the transfer efficiency of the second transfer station 232 is set to 50. If you want to set it to %, use the P sensors 21 and 22 at positions A and B or positions A and C. Whether the difference between the detection levels of the P sensors 21 and 23 at the It can be determined by

[0061] (5) Transfer current control in the mode of simultaneously copying multiple sheets (1 development, 2 transfer) (5-1) First transfer station 231 and second transfer station 232 Transfer current control when using corona discharge method in FIG. 15 is a flowchart showing the control procedure in this method. This control hand In order, first, it is checked whether the power is turned on (step S15-1, hereinafter, (abbreviated as S15-1), if it is immediately after being turned on, the number of copies counter is cleared. (S15-2) Cleaning the casing of the first transfer station 231 mentioned above. (S15-3). Support for cleaning the casing of the first transfer station 231 After running the routine, check the cleaning completion flag to see if the cleaning is complete ( S15-4). Then, cleaning of the casing of the first transfer station 231 is completed. At this point, the casing of the second transfer station 232 is cleaned (S15-5). ). When the cleaning is completed (S15-6), the transfer chamber of the first transfer station 231 is At the same time as turning on the controller (S15-7), turn on the drum drive motor and drive the drum. Prevent fatigue.

[0062] After turning on the transfer charger of the first transfer station 231, the first transfer station The above-mentioned distribution ratio between the transfer station 231 and the second transfer station 232 is calculated (S15- 8) The transfer drum current applied at the first transfer station 231 is separately controlled. Calculate with reference to the table (S15-9). This table is shown in Figure 16. Transfer drum current ID of the first transfer station 231 and the first transfer station 23 It was created based on a graph showing the relationship between transfer efficiency η of No. 1.

[0063] After calculating in step S15-9, the first transfer station is further calculated based on the distribution ratio. The total current at the transfer station 231 is calculated (S15-10), and the total current at the first transfer station 231 is calculated (S15-10). It is checked whether the actual measured value of the total transfer current No. 31 is equal to the calculated value (S15-11). If they are not equal, change the total transfer current of the first transfer station 231 (S1 5-12), increment the loop counter (S15-13). Then, Check whether the value of the loop counter is less than 10 as shown in the flowchart of Figure 17. (S15-14), and if it is 10 or more, the first transfer station 231 is above, the first transfer station error flag is set (S15-15), and the first transfer station Turn off the station transfer charger and return.

[0064] Further, in step S15-11, the total transfer current of the first transfer station 231 is realized. If the measured value is not equal to the calculated value, the transfer charger of the first transfer station 231 OFF (S15-17) and clear the loop counter (S15-18) As shown in the flowchart of FIG. 18, the transfer efficiency of the second transfer station 232 is approximately A transfer drum current corresponding to 100% is calculated (S15-19). Then the distribution The total transfer current of the second transfer station 232 is calculated from the ratio (S15-20), and the transfer It is checked whether the measured value and the calculated value of the total photocurrent are equal (S15-21). If they are equal, clear the loop counter (S15-22) and return, etc. If not, change the total transfer current of the second transfer station 232 (S15-2 3). After that, the loop counter is incremented (S15-24) and the loop counter is incremented (S15-24). It is checked whether the counter is less than 10 (S15-25). This step S15 -25 is less than 10, the process from step S15-20 onward is executed again, and 1 If it is 0 or more, the output of the second transfer station 232 is abnormal, so the output of the second transfer station 232 is abnormal. The transfer station output error flag is set (S15-26), and the second transfer station 23 2 transfer charger is turned off (S15-27).

[0065] On the other hand, when it is determined in step S15-1 that the power has not been immediately turned on, Check whether copying is in progress (S15-28), and if copying is not in progress, check the number of copies. Check whether the counter is greater than 500 (S15-29) . If it is larger than 500, execute the process from step S15-2 onwards, and if it is larger than 500, Returns if below.

[0066] Further, when it is determined in step S15-28 that copying is in progress, Check whether the registration sensor 9 is ON as shown in the flowchart ( S15-30). If it is not ON, return; if it is ON, the above Execute the subroutine to check the transfer current control data import timing for each paper type. (S15-31), and executes a subroutine for importing transfer current control data based on paper type. Execute (S15-32). Furthermore, the first transfer of transfer current control based on the paper type A subroutine for calculating the transfer drum current at the station 231 is executed (S1 5-33) Calculate the total current of the first transfer station 231 based on the distribution ratio (S15-34). After calculating in this step, the first transfer station 231 Check whether the actual measured value and calculated value of the total transfer current are equal (S15-35), etc. If they are equal, clear the loop counter (S15-36) and return. If so, the total transfer current value of the first transfer station 231 is changed (S15-37). After that, the loop counter is incremented (S15-38), and then the loop counter is incremented (S15-38). It is checked whether the counter is less than 10 (S15-39). If step S1 If it is determined in step S15-39 that it is less than 10, the process returns to step S15-34 and the After performing the following processing, if it is determined that the number is 10 or more, the first transfer station Since the output of the transfer station 231 is abnormal, the first transfer station abnormality flag is set (S 15-40). In other words, check the actual measured value and calculated value of the total transfer current 10 times. If they do not match, transfer to the first transfer station 231 or the second transfer station. This will set the output abnormality flag of the button 232. Then, step S15-40 When the process is completed, the transfer charger of the first transfer station 231 is turned off. (S15-41) Return.

[0067] (5-2) Corona discharge at the first transfer station 231, second transfer station Transfer current control when using the belt transfer method in section 232 God FIG. 20 is a flowchart showing the control procedure in this method. This control hand In order, first check whether the power has been turned on (S20-1), and then check whether the power has been turned on immediately. If it is later, clear the copy number counter (S20-2) and perform the first transfer described above. The casing of station 231 is cleaned (S20-3). 1st transcription After executing the casing cleaning subroutine in station 231, cleaning is completed. The cleaning end flag is checked to see if it has been completed (S20-4). Then, the first transfer stage When cleaning of the casing of the first transfer station 231 is completed, the first transfer station 23 Turn on the transfer charger 1 (S20-5) and turn on the drum drive motor at the same time. to prevent drum fatigue. Also, turn on the developing bias to transfer toner to the drum. Prevents adhesion.

[0068] After turning on the transfer charger of the first transfer station 231, the first transfer station The above-mentioned distribution ratio between the transfer station 231 and the second transfer station 232 is calculated (S20- 6) Turn off the transfer shutter that was turned on in step S20-5 (S20- 7). After that, in the case of a digital copier, the polygon motor has reached the specified speed. (S20-8), and if the specified speed is not reached, return and In other words, judge whether the output of the laser diode is as specified (S 20-9). If the output of the laser diode does not rise to the specified level, write Since it cannot be loaded, return and if it is raised, turn on the drum motor. (S20-10).

[0069] Next, as shown in the flowchart of FIG. As and PCC are successively turned ON (S20-11, 12, 13). moreover, Charger, development motor, laser diode for writing and development bias are turned on in this order (S20-14, 15, 16, 17). This step S2 The steps from 0-14 to 17 are processes for creating a P sensor pattern, A halftone pattern is created, but in the case of a digital copier, the writing laser is The Diode creates a solid black pattern and adjusts the development bias to create a halftone. Ru. For analog copying machines, turn on the writing laser diode (S20-16). No processing is required, just create a pattern by turning the charger ON/OFF and adjust the potential. Make it a halftone. When the process of step S20-17 is completed, the second transfer step Turn on the transfer charger of the transfer section 232 (S20-18) and control the initial transfer current. Execute the subroutine (S20-19) and turn off the load (S20-20 ) Return.

[0070] On the other hand, when it is determined in step S20-1 that the power has not been immediately turned on, Check whether copying is in progress (S20-21), and if copying is not in progress, check the number of copies. Check whether the counter is greater than 500 (S15-22) . If the value is greater than 500, the process from step S20-2 onwards is executed, and if the value is greater than 500, Returns if below.

[0071] Further, when it is determined in step S20-22 that copying is in progress, Check whether the registration sensor 9 is ON as shown in the flowchart ( S20-23). If it is not ON, return; if it is ON, the above Execute the subroutine to check the transfer current control data import timing for each paper type. (S20-24), and executes a subroutine for importing transfer current control data based on paper type. Execute (S20-25). Furthermore, the first transfer of transfer current control based on the paper type A subroutine for calculating the transfer drum current at station 231 is executed (S2 0-26), the first transfer speed is determined by the distribution ratio as shown in the flowchart of Figure 23. The total current of the station 231 is calculated (S20-27). Calculated in this step After that, check whether the actual measured value and the calculated value of the total transfer current of the first transfer station 231 are equal. (S20-28), and if they are equal, clear the loop counter (S20-28). 20-29) Return, if not equal, transfer total of first transfer station 231 The current value is changed (S20-30). Then increment the loop counter (S20-31), and further checks whether the loop counter is less than 10 ( S20-32). If it is determined in step S15-39 that it is less than 10, , returns to step S20-27 and executes the subsequent processing, and if it is determined that the number is 10 or more, When the first transfer station 231 is disconnected, the output of the first transfer station 231 is abnormal. A station abnormality flag is set (S20-33). In other words, the total transfer current Check the actual measured value and calculated value 10 times, and if they do not match, transfer the first transfer station. This will set an output abnormality flag for the engine 231. Then, step S20-34 When the process is completed, the transfer charger of the first transfer station 231 is turned off. (S20-35) Return.

[0072] (5-3) Cleaning operation of transfer charger, wire and casing Below is the transfer charger, wire and casing clip performed in the previous step. The leaning motion will be explained.

[0073] The processing procedure for this operation is shown in the flowchart of FIG. In this process, first, Check whether cleaning is completed (S24-1). If cleaning is completed, restart If not, check whether the motor is rotating in reverse (S24). -2). If the motor is not rotating in reverse, check to see if the motor is rotating forward. (S24-3). If the motor is not rotating in the normal direction, start the motor in the normal direction (S24 -4) and simultaneously start a timer (S24-5). Note that step S24 -4, it goes without saying that the motor rotates forward even when the motor is stopped. Nor.

[0074] After starting the timer in step S24-5, the return position is It is checked whether the time set in RP has elapsed (S24-6). Li The turn position is the position until the motor moves from forward rotation to reverse rotation as shown in Figure 25. refers to the time of Note that in the figure, HP indicates the home position.

[0075] Then, when the return position set time has passed, the motor rotates in the forward direction. The motor is stopped (S24-7), and the motor is then reversed (S24-8). That is, When the cleaner reaches the return position, reverse the motor and return the cleaner. Then, the timer is cleared and started (S24-9). Then the home position Check whether the motor has returned to the correct position (S24-10), and when it returns, reverse the motor. It is stopped (S24-11). This clears the timer (S24-12) The cleaning is completed and a cleaning completion flag is set (S24-13).

[0076] On the other hand, if it is determined in step S24-10 that the home position has not been reached, When the error set time has passed (S24-14), check if the error set time has passed. If not, return; if it has passed, return position or home position The cleaner has not come to the station for a certain period of time, and there is some kind of abnormality with the cleaner. This indicates that a problem has occurred, so set the cleaner abnormality flag (S24- 15) Return.

[0077] Also, when it is confirmed in step S24-2 that the motor is rotating in reverse, , skip to step S24-10, execute the subsequent processing, and proceed to step S24-10. If it is determined in S24-3 that the motor is rotating forward, step S24-6 Skip to and perform subsequent processing. Furthermore, in this step S24-6 When it is determined that the return position set time has not yet passed, The process moves to step S24-14, and subsequent processing is executed.

[0078] (5-4) Calculation of transfer current distribution ratio The transfer current distribution ratio described above is processed according to the flowchart shown in FIG. Ru. That is, in this process, first, the total transfer current is read (S26-1), and the total transfer current is read (S26-1). The casing current is read (S26-2). Then, the distribution ratio is Distribution ratio = (total transfer current - transfer casing current) / total transfer current It is calculated from the formula (S26-3).

[0079] Once the distribution ratio is calculated, the transfer drum current is Transfer drum current = total transfer current x distribution ratio It is calculated from the formula (S26-4).

[0080] (5-5) The first transfer station is corona discharge, the second transfer station is base Initial transfer current control for root transfer A flowchart showing the processing procedure for initial transfer current control in this case is shown in FIG. . In this process, it is first checked whether initial transfer current control has been completed (S27 -1), returns if completed, if not completed, starts by P sensor output. The transfer efficiency of the second transfer station 232 is calculated (S27-2). Note that this calculation The transfer efficiency of the second transfer station 232 is calculated by the two P sensors. However, there are three methods depending on the position of the P sensor. For details, see the flowchart below. explain.

After calculating the transfer efficiency of the second transfer station 232 by executing the subroutine of step S27-2, the transfer efficiency of the first transfer station 231 is calculated from the transfer efficiency of the second transfer station 232 and the table (S27 -3). Note that the table is set such that the transfer efficiency η ₁ of the first transfer station 231 can be determined from the transfer efficiency η _2ST of the second transfer station 232 in the characteristic diagram of FIG.

[0082] The subroutine of step S27-3 is executed to transfer the first transfer station 231. After calculating the transfer efficiency, it is determined whether the transfer efficiency of the first transfer station 231 is 50%. It is checked (S27-4). If it is 50%, control ends. Set the completion flag (S27-5) and return. If not, Δη₂niη _2A and η_2STThe absolute value of the difference between (|Δη_2A−η_2ST|) (S27-6), and η ₂ The transfer drum current difference ΔI to be controlled by₂is calculated (S27-7). Na In addition, in steps S27-4 and S27-5, the transfer of the first transfer station 231 is performed. When the transfer efficiency is 50%, the control end flag is set, but when the transfer efficiency is 45% or more, If the control is terminated within the 50% range, the control time can be shortened. Also, roll Difference in photo drum current ΔI₂The calculation is based on the transfer drum current and transfer efficiency η in FIG._1,η₂ This is done in accordance with the characteristic diagram showing the relationship between. In this figure, the solid line indicates the standard environment. The broken line is the actual data. In this diagram, the second transfer station is currently If the IS transfer drum current is flowing through the second transfer station 232, The transfer efficiency of 2 is η_2AIt is. Also, η_2STis η₁The second transfer step when is 50% 232 shows the transfer efficiency of section 232.

[0083] After completing the process of step S27-7, η_2Aand η_2STCompare the size of (S 27-8). And η_2STis η_2AIf it is above, the transfer drum current I_ATo (I_ST +ΔI₂) (S27-9) and calculate the total transfer current using the distribution ratio ( S27-10), η_2Ais η_2STIf the transfer drum current I is smaller than_ATo (I_ST−ΔI ₂ ) (S27-11), and feedback is applied from step S27-2 onwards. Execute the following process. Note that the number of times this feedback is too large is that the first transcription step If the transfer efficiency of Station 231 does not reach 50%, or if it is between 45 and 50%. If it is not within the range, set the 2nd transfer station output or higher flag. . Also, after the process of step S27-10, a control end flag is set. You can also do this. That is, when performing feedback, the step S27- Settings are made so that 2, 3, and 4 are omitted and the process proceeds to step S27-5. This results in Only one P sensor pattern is required.

[0084] (5-6) Second transfer station transfer efficiency calculation using P sensor output (5-6-1) When using P sensors at A and B positions When reflective sensors are used at positions A and B in Fig. 13, in other words, when the first The transfer efficiency of the second transfer station 232 is determined using the P sensors 21 and 22. The procedure for calculating the ratio will be explained with reference to the flowcharts in Figures 30 and 31. I will clarify.

First, a latent image of a P sensor pattern (20 mm x 20 mm) of a halftone solid image is created (S30-1), and the pattern is developed (S30-2). Next, a subroutine for measuring the potential _VSG of the background area is executed, in which the first P sensor 21 measures the potential of the background area outside the P sensor pattern formation area five times and calculates the average value (S30-3). ), it is checked whether the potential _VSG of the background part shows an abnormal value (S30-4).

If it is determined that an abnormal value is shown, the sensor abnormality flag is set (S30-5) and the process returns; if no abnormal value is shown, the first The P sensor 21 measures the potential of the P sensor pattern section at position A five times, and executes the P sensor pattern potential V _SP measurement subroutine to calculate the average value (S30-6), and calculates the potential V of the P sensor pattern section. Check whether _SP shows an abnormal value (S30-7). If it is determined that the check indicates an abnormal value, the sensor abnormality flag is set in step S30-5 and the process returns. If it is a normal value, the pattern potential level V _SP /V _SG at the A position is calculated (S30-8), and the toner density M/A is calculated from the pattern potential level V _SP /V _SG at the A position, M/A-( V _SP /V _SG ) is calculated with reference to the characteristic table (S30-9).

[0087] Next, the P sensor 22 at position B measures the ground potential _VSG on which no P sensor pattern is formed five times and takes the average (S30-10). It is confirmed whether an abnormal value is shown (S30-11). If an abnormal value is shown, a sensor abnormality flag is set (S30-12), and if an abnormal value is not shown, the potential of the P sensor pattern section at position B is measured five times with the second P sensor 22, and the potential of the P sensor pattern section at position B is measured five times. The average value is calculated (S30-13), and it is checked whether the potential V _SP of the P sensor pattern section shows an abnormal value (S30-14). If it is determined that the check indicates an abnormal value, the sensor abnormality flag is set in step S30-12 and the process returns. If it is a normal value, the pattern potential level V _SP /V _SG at the B position is calculated (S30-15), and the toner density M/A is calculated from the pattern potential level V _SP /V _SG at the B position as M/A-( V _SP /V _SG ) is calculated with reference to the characteristic table (S30-16). Then, the transfer efficiency of the second transfer station 232 is calculated from the M/A of the A position and the B position (S30-17).

(5-6-2) When using P sensors at positions A and C In this process, the toner density is calculated at position C instead of position B in 4-6-1. Therefore, if the process for the B position in steps S30-10 to S17 in FIG. 31 is replaced with the process for the C position, the process can be performed in the same procedure. Note that if the background potential _VSG or the P pattern potential _VSP at the C position shows an abnormal value, a sensor abnormality flag is similarly set.

(5-6-3) When using P sensors at positions B and C In this process, the toner density is calculated at position C instead of at position A in 4-6-1. Therefore, if the processing for the A position in steps S30-3 to S30-9 in FIG. 31 is replaced with the processing for the C position, the processing can be performed in the same procedure. Note that when the background potential V _SG or the P pattern potential V _SP at the C position shows an abnormal value, a sensor abnormality flag is similarly set. In this case, the output values of the two sensors at positions B and C can be compared without calculating the transfer efficiency of the second transfer station 232, and if they are equal, it can be determined that the transfer efficiency is 50%.

[0090] (5-7) Transfer current control by paper type detection (5-7-1) Data import timing check Figure 32 shows the processing procedure for checking the data import timing in paper type detection. . In this process, first check the size of the registration timer and set time ( S32-1). With this check, the value of the registration timer is greater than or equal to the set time. , that is, after the paper passes the registration sensor, the preset When it comes under the counter electrode 302 after a period of time, set the paper type check flag. (S32-2). Then, whether the check end flag is set or not Check (S32-3), and if it has not been set yet, that is, check the paper type. If the paper type check has not been completed yet, allow the paper type check interruption (S32-4) and return. Turn on. On the other hand, when the check end flag is set and the check has ended In this case, interrupts for checking the paper type are prohibited (S32-5), and the pointer is cleared (S32-5). 32-6) Return. Also, the registration timer is set in step S32-1. When the paper has not reached the cut time, the paper has not come under the counter electrode, so the paper type cannot be determined. Disable check interrupts (S32-5) and clear the pointer (S32-6) ) Return.

[0091] (5-7-2) Data import Data acquisition is processed according to the procedure shown in FIG. This process takes 2ms This is an interrupt routine for each ec, and in this routine, the paper type check Check whether the rug is set (S33-1) and check if the paper type check flag is set. When it is determined that the pointer is not set, the pointer is cleared (S33-2). , when it is determined that the pointer is set, it is further determined whether the pointer is less than 10. A judgment is made (S33-3). If this judgment is less than 10, read the paper type data ( S33-4), and the paper type data is entered in the paper type flag (S33-5). this step The process in S33-5 is based on the paper type flag.

[0] ~

Enter the paper type data in the array [9] in order. It is something that will continue to grow. After completing the process in step S33-5, the pointer is incremented. ment and return.

[0092] On the other hand, when it is determined in step S33-3 that the pointer is 10 or more, , the average paper type data is calculated by taking the average of the 10 paper type data (S33-7), and the calculation Check whether the average paper type data that is output is between the preset upper and lower limit values. It is checked (S33-8). If it is, set the check end flag. (S33-9), and if it has come off, sets the counter electrode abnormality flag (S33-1 0) Return. Note that the counter electrode abnormality flag is set in step S33-10. In this case, transfer current control based on paper type detection is not performed. Also, at the same time The LED display indicates to the operator that transfer current control based on paper type detection is not being performed. It is set to notify the data.

(5-7-3) Transfer current determination The transfer current is determined according to the processing procedure shown in the flowchart of FIG. In this process, it is first determined whether the adjustment end flag is set (S34-1). If the adjustment end flag is set in this judgment, the process returns, and if it is not set, the table is changed from the transfer current standard value _IS of the first transfer station 231 (S34-2). In this table, when both the first transfer station 231 and the second transfer station 232 are in the corona discharge state, the transfer current standard value I _S is calculated from the solid line in FIG. 35 as a table. Furthermore, when the first transfer station 231 uses corona discharge and the second transfer station 232 uses belt transfer, the transfer current standard value I _S changes to the position of I _S1 or I _S2 as shown by the broken line in FIG. 35, depending on the transfer efficiency setting using the P sensor pattern. Move to. The table is shifted according to this movement amount and used in the processing after this step.

After executing the subroutine of step S34-2, it is checked whether the average paper type data V _A is equal to the standard paper type data V _ST (S34-3). This check is performed by calculating the potential difference between the opposing electrodes of the standard paper and the transfer paper, as shown in FIG. Then, the difference between V _ST and V _A is substituted for the potential difference ΔV _A between the paper type data of the standard paper and the transfer paper (S34-4). Thereafter, the potential difference ΔV _A of the paper type data is converted into the transfer drum current difference ΔI _A using a table (a table version of FIG. 37), and the transfer drum current difference ΔI _A is determined (S34-5). Next, the average paper type data V _A and the standard paper type data V _ST are compared (S34-6), and if the average paper type data V _A is larger than the standard paper type data V _ST , the transfer drum currently outputting After subtracting the transfer drum current difference ΔI _A depending on the paper type from the current I _S and subtracting it to the transfer drum current I _A (S3 4-7), the adjustment completion flag is set (S34-8) and the process returns. If, as a result of the comparison in step S34-6, the average paper type data V _A is less than or equal to the standard paper type data V _ST , then the transfer drum current difference ΔI _A depending on the paper type is added to the currently output transfer drum current I _S . After adding and substituting the transfer drum current I _A (S34-9), the adjustment completion flag is set (S34-8) and the process returns. The relationship between the transfer drum current difference ΔI _A , the transfer drum current I _A and the currently output transfer drum current I _S in steps S34-7 and S34-9 is as shown in FIG.

[0095] (6) Copy mode selection The copy mode, ie, the method for selecting the copy mode, will be described below.

[0096] Copy modes include each option, 2nd transfer station unit, page memory Depending on printer mode etc. ・One-on-one mode ・Simultaneous multiple copy mode (number of copies is 2 or more) - Mode only for the first transfer station (normal copy operation) ・Second transfer station only mode (normal copy operation) There are four modes to choose from.

[0097] Judging from the state of the copier including the options, these four modes A method to automatically select a mode from among and execute copying, so-called auto selection The operator manually selects the mode by operating the "mode selection key" on the control panel of the copier. There are two methods, so-called manual selection. When auto selection is selected, The selection is made according to the procedure shown in the flowcharts in Figures 40 and 41, and the In the case of manual selection, the status of the copier and the key are Selected according to input status. In addition, in the case of this manual selection, Displays warnings when modes such as "Confirmation" and "Paper Confirmation" are inappropriate. It is set to warn you.

[0098] A general control flow for this copy mode selection is shown in FIG. child In the process, when a program start command is sent from system control, First, when this program start command is received ( S39-1) Initialize the port input and output status and RAM (S39-2), and Initial processing is performed for each control unit, such as writing and drive control units, and peripheral equipment The connection status is confirmed (S39-3). Next, standby processing, for example fixing heater control , door open, initial jam check, 1st transfer station and 2nd Other process controls of the transfer station, laser diode power control (APC), Checks the polygon motor drive, transfer paper size, etc., and collects data for each state. data is sent to system control (S39-4).

0099 After sending, it enters the reload state (S39-5), and when copying starts (S3 9-6) Select the copy mode (S39-7) and execute the copy (S39-8) ). Then, the process returns to step S39-7 until the copying is completed. At the point in time, the process returns to step S39-4 and the subsequent processes are executed (S39-9).

[0100] (6-1) Copy mode selection process (6-1-1) Auto selection Figures 40 and 41 show flowcharts of the auto selection copy mode selection process. show.

[0101] In this process, as shown in Figure 40, the auto selection switch is first set. If so (S40-1), check whether the length of the transfer paper is 216 mm or less (S4 0-2). If it is less than 216mm, the first transfer station Check whether the output and cleaner error flags are set (S4 0-3). This check ensures that the output and cleanliness of the first transfer station 231 When it is determined that there is no abnormality, the unit of the second transfer station is connected. (S40-4), and furthermore, the second transfer station Check whether the output from the unit is abnormal (S40-5). And it's normal If it is confirmed that the (S40-6) and return. In this case, the explanation of the operation panel in Figure 42 Select the mode so that the fine mode LED (FLED) 304 in the figure lights up. Press the selection key 309.

[0102] Also, in the check in step S40-4, the second transfer station unit is connected. If it is determined that the copy operation has not been performed, the copy operation is prohibited (S40-7) and the turn on. Furthermore, the second transfer station unit is checked in step S40-5. If the output from the copy is determined to be abnormal, it is possible to copy it normally. Since this is not possible, the copy operation is still prohibited (S40-7). Also, step S 40-3 check output from the first transfer station unit and cleaner If it is determined that the unit is normal, only the first transfer station unit is used. A normal copy is performed (S40-8) and the process returns. In this case, the model in Figure 42 The fine mode LED (FLED) 304 lights up by the mode selection key 309. Press the button as shown below.

[0103] On the other hand, it is determined in step S40-2 that the transfer paper length is greater than 216 mm. In this case, as shown in the flowchart of FIG. Check the output error flag of the station and second transfer station unit. (S40-9), and if the abnormality flag is set, that is, if there is an abnormality, the Execute the process from step S40-3 onward, and if normal, the second transfer station unit Check whether the port is connected (S40-10). if not connected After all, the processes after step S40-3 are executed, and the first transfer station unit is Perform the copy operation using only the If connected, an optional page menu will appear. Check whether the harpoon is connected (S40-11). This page memory is connected If the scanner is in printer mode, i.e. when scanning documents with a scanner. As well as inputting image data from floppy disks and optical disks, during exposure ( When forming a latent image), there is no space between documents (interval between each latent image). this is, Original scanning time + scanner return time < exposure time (latent image formation time) This is because.

[0104] When it is determined in step S40-11 that the scanner is not connected, Furthermore, it is checked whether it is in printer mode (S40-12), and If the printer mode is not set, the number of copies is confirmed (S40-13). stop If the number of cards is 1, execute the process from step S40-3 onwards and select only 1 card. If two or more copies are made, the first transfer station unit and the second Copy multiple sheets at the same time using the transfer station unit (S40-14) , set process conditions and timing conditions for simultaneous multiple mode (S40-15) Return. In this case, the speed mode LED (SLED) 305 lights up. Press the mode selection key 309 as shown in FIG. Also, in step S40-11, If it is determined that the page memory is not connected, or in step S40-1 If it is determined that the printer mode is not set in step 2, the first transfer station Performs one-to-one copying using the transfer station unit and second transfer station unit. (S40-16), and set the process conditions and timing conditions for the one-to-one mode. (S40-17) and returns. In this case, fine/speed mode L Press the mode selection key 309 so that the ED (FSLED) 306 lights up. Ru.

[0105] In addition, in this embodiment, both the one-to-one mode and the simultaneous multiple mode are set to LT horizontal (8.5 Inch: 216 mm) or smaller transfer paper is the only option available due to layout considerations. Therefore, LT horizontal>Longitudinal length of transfer paper in the case of, ・Normal copying using only the first transfer station unit ・Normal copying using only the second transfer station unit There are two types of copies to choose from. Also, LT width ≦ Transfer paper longitudinal length in the case of, ・One-to-one mode (no gap between latent images) ・Simultaneous multiple mode (two copies from one latent image) ・Normal copying that uses only the first transfer station ・Normal copying using only the second transfer station It is possible to select from four types.

[0106] (6-1-2) Manual selection FIG. 43 is a flowchart showing the processing procedure in manual selection mode. this The process starts when the manual selection switch is turned on (S43-1 ). Then, if the second transfer station unit is connected (S43-2) , check whether the mode selection key 309 is turned on (S43-3 ). If the mode selection key 309 is not turned on, return to If so, the FLED is 1, that is, the fine mode LED is on. (S43-4), and if it is ON, the first transfer station output is abnormal. The normal flag and the second transfer station output abnormal flag are both set. It is checked whether there is any error (S43-5). There is no abnormality in this step S43-5. When it is determined that the cleaner error flag is set, it is checked. (S43-6), and if there is no abnormality, the sensor abnormality flags 2 and 3, in other words, the The flags indicating an abnormality of the second P sensor 22 and the third P sensor 23 are set respectively. It is checked whether it has been written (S43-7). If each is not abnormal, Check whether the copy number is 2 or more (S43-8), and if it is not 2 or more, Turn on the "Verify" display (S43-9) and check whether the transfer paper length is 216 mm or less. (S43-10). Further, in step S43-8, the copy number is 2 or more. When it is determined that step S43-9 is skipped and step S43-9 is directly executed -10 processing is performed. If the transfer paper length is 216 mm in step S43-10, If it is determined that the size is larger, turn on the “Paper confirmation” display (S43-1 1) Set FLED to 0, SLED to 1, and FSLED to 0 (S43-12 ). Also, if it is determined in step S43-10 that the transfer paper length is 216 mm or less, If so, the process directly advances to step S43-12. Processing in step S43-12 After performing , the first transfer station unit and the second transfer station unit Execute simultaneous multiple copies using multiple copies (S43-13), and After setting the process conditions and timing conditions (S43-14), the buzzer sounds once. It rings twice to notify the completion of the setting (S43-15) and returns.

[0107] On the other hand, in step S43-2, the second transfer station unit is not connected. If it is determined that there is no problem, check whether the cleaner error flag is set. (S43-16). In this step S43-16, the cleaner is found to be abnormal. When it is determined that the first transfer station output error flag is set. It is checked whether there is one (S43-17). If there is no abnormality, the FLED After setting 1, SLED to 0, and FSLED to 0 (S43-18), the first turn Execute normal copy using only the photo station unit (S43-19) Return.

[0108] Also, if it is determined that there is an abnormality in steps S43-16 and S43-17, Sometimes, FLED is set to 1, SLED is set to 0, and FSLED is set to 0 (S43- 20), prohibits the copy operation (S43-21), and returns.

[0109] If it is determined in step S43-4 that FLED is set to 1, When SLED is set to 1, as shown in the flowchart of Figure 44, Check whether it is set (S43-22), and if it is set, check the It is confirmed whether the display is being performed (S43-23). Then, “Confirm number setting” is displayed. If the page memory is connected, the display is erased (S43-24) and the page memory is connected. (S43-25). In addition, in step S43-23, "set number If it is determined that the “Confirm” display is not being performed, the “Confirm Number” display will disappear. Since there is no need to do so, the process directly skips to step S43-25. In addition, the sticker If it is determined in step S43-25 that the page memory is not connected, the Check whether the printer mode is set (S43-26) and set it to the printer mode. If not, check whether the “Paper confirmation” message is displayed (S43-2 7). If the "Paper Check" display is displayed in step S43-27, the display is erased. (S43-28) Set FLED to 1, SLED to 0, and FSLED to 0. (S43-29), first transfer station unit or second transfer station The counter check subroutine described later that uses only one of the counter units It is executed (S43-30), and the buzzer to indicate the end of execution sounds once (S43-31). Na Oh, if "Paper confirmation" is not displayed in step S43-27, directly The process of step S43-29 is executed.

[0110] Also, it is determined in step S43-22 that SLED is not set to 1. When this occurs, the display for “Confirm Number” and “Confirm Paper” will disappear (S43-3) 2, 33), perform the processing from step S43-29 onwards.

[0111] Furthermore, it is determined in step S43-25 that the page memory is connected. or if it is determined that the printer mode is in step S43-26. If the length of the transfer paper is 216 mm or less, check whether the length of the transfer paper is 216 mm or less (S43-34 ). If the transfer paper length is 216 mm or less, erase the "Paper confirmation" display (S43). -35), if the transfer paper length is greater than 216mm, the “Paper Check” display will light up. (S43-36), set FLED to 0, SLED to 0, and FSLED to 1. (S43-37) First transfer station unit and second transfer station unit One-to-one copy mode using knitting is executed (S43-38). And 1 Set the process conditions and timing conditions for the one-to-one copy mode (S43-39 ), the buzzer sounds once to indicate the end of the setting (S43-40), and the process returns.

[0112] In step S43-5 described above, the first transfer station and the second transfer station When it is determined that one of the output abnormality flags of the As shown in the flowchart in step 5, which station's output error flag is set? (S43-41, 42) and determines that both outputs are abnormal. When the copy operation is prohibited (S43-43), the first transfer station is normal, copying using only the first transfer station unit is executed. (S43-44), and when the second transfer station is normal, the second transfer station Execute the copy using only the application unit (S43-45) and return. .

[0113] When it is determined in step S43-6 that the cleaner is abnormal, the Steps S43-45 of the flowchart No. 45, that is, the second transfer stage Execute a normal copy using only the application unit and return.

[0114] All sensor abnormality flags 2 and 3 are set in step S43-7 described above. That is, when it is determined that sensors 2 and 3 are abnormal, the flowchart of FIG. Check whether the page memory is connected as shown in the diagram (S43-46). If it is not connected, then check if it is in printer mode. (S43-47). If page memory is not connected, Or, if the page memory is connected but not in printer mode, the screen shown in Figure 4 4, the process from step S43-34 onwards in the flowchart is executed, and the page memory is is not connected and is not in printer mode, step S43-29 Execute the following processing.

[0115] In addition, the LED light emission rotation of FLED, SLED, and FSLED on the operation panel The application will be as shown in Figure 47. Please note that this rotation may occur when some abnormality occurs. The ○ mark in the figure indicates the lighting state of the LED.

[0116] (6-1-3) Counter check processing Contents of the counter check subroutine in step S43-30 described above is as shown in the flowchart of FIG. This subroutine Both the transfer station and the second transfer station can be used, and either If only one unit is used, the first transfer station and second transfer station The process of selecting the one with the larger number of sheets/number of jams, that is, the one with the lower jam rate. It is true.

[0117] In this process, the counter of the first transfer station (at the first transfer station) number of copies/number of jams at the first transfer station) (S48-1), The counter of the second transfer station (number of copies at the second transfer station/number of copies at the second transfer station) Enter the number of jams at the second transfer station (S48-2), and select which counter It is compared whether the value of is large (S48-3). As a result, the first transfer station If the counter value is greater than or equal to the counter value of the second transfer station, the first transfer station Perform normal copy using only the version unit (S48-4) and return. The counter value of the first transfer station is smaller than the counter value of the second transfer station If not, perform normal copying using only the second transfer station unit (S 48-5) Return.

[0118] During the copy operation, the following counter is counted up each time the transfer paper is ejected. . These counters include the number of copies counter at the first transfer station and the number of copies counter at the second transfer station. copy number counter at the transfer station, i.e. the first transfer station and and total number of copies counter at the second transfer station, main switch This is a counter for the number of copies after the main switch is turned on, and it is a counter for the number of copies after the main switch is turned on. All but a few counters are backed up by non-volatile RAM.

[0119] In addition, a total jam counter and a first transfer station are used as counters in the event of a jam. transfer station jam counter, second transfer station jam counter, paper feed jam counter printer, fusing jam counter, paper output jam counter, duplex jam counter, reversing jam counter, Jam counter, transport jam counter, sorter/stapler jam counter available. All of these are backed up by non-volatile RAM. (7) Functions of reading control circuit and reading drive device FIG. 49 shows a control block diagram of the entire copying machine according to the embodiment. This copier's system The system includes a reading device (scanner) 400, a copying device 500, and an automatic document feeder (AD). F) 600, floppy disk drive (FD) 700, optical disk drive ( OD) 800 and a sorter/stapler device 900. . The reading device includes an image reading circuit (VPU) 401 and an image processing circuit (IPU) 402. , a reading drive device 403 and a reading control circuit 404. 0 consists of an image information storage device 501, a copying circuit 502, and an operating device 503. has been done. Below, the main devices will be explained one by one. Furthermore, Figure 49 shows the overall This is a schematic diagram of the configuration, and the configuration of each main part is shown in blocks in FIGS. 50 to 55, respectively. Shown as a diagram. Also, although I believe that the connection status of each part can be seen from Figure 49, Figure 50 also shows the connection status of each part. Please mark the lines A to H and L1 and L2 in Figure 55 to clearly indicate the connection status. It has been done.

[0120] (7-1) Reading control circuit The reading control circuit 404 shown enlarged in FIG. 50 is the main system control circuit 504. A signal is received at L1 from control. The various parts are as follows.

[0121] ・Rotation speed control of scanner motor 410 ・Control of fluorescent lamp heater 411 ・Instruction to turn on the fluorescent lamp 412 ・ADF stop pawl solenoid 413 control ・Control of filter solenoid 414 for document size detection ・Control of scanner power supply cooling fan 415 Note that the control of the ADF device 600 and the ADF stop claw solenoid 41 described above are Control number 3 applies when ADF is installed as an option. Also, read control The circuit 404 includes an encoder 443 that detects the rotational state of the scanner motor 410. The first gate array 420 of the image processing circuit 402 (described later) Equipped with a frequency divider circuit rotation direction detection circuit 427 that sends a rotation direction signal of the motor 410. It is growing.

[0122] Further, the reading control circuit 404 is equipped with an ADF device 600 as an option. If so, control signals are input and output between them. The ADF device 600 has , an ADF control circuit 601, and an ADF control device 602.

[0123] (7-2) Image reading circuit As shown in FIG. 51, the image reading circuit (VPU) 401 includes a CCD 4 that performs photoelectric conversion. 15, amplifiers 416a and 416b that amplify the signal converted by CCD 415, switch switching element 417 for performing signal synthesis according to the input of the clock clock , an amplifier 4 that amplifies the output from the switching element 417 according to the AGC data. 18 and AD converts the output from the amplifier 418 according to the input of the AD clock. It is composed of an AD converter 419. This configuration provides the following functions: It is designed to be effective.

[0124] ・Photoelectric conversion: Converts the reflected light from the original into a 400 dpi image using CCD415. Convert to analog signal.

[0125] ・Signal amplification: Signal from CCD415 is converted into odd number (ODD) and even number (E VEN) by amplifiers 416a and 416b, respectively. Amplify it. In this case, the time per pixel is very short. Therefore, it is divided into two parts due to the convenience of the amplifier.

[0126] ・Signal synthesis: ODD and EVEN are serially connected by switching element 417. convert it into an analog signal.

[0127] ・Variable amplification: Based on AGC data from the image processing circuit (IPU) 402 Perform amplification. In this case, AGC (auto gain control) ) is the brightness of the fluorescent lamp 412 read by the CCD 415 In order to compensate for fluctuations in (variations due to temperature, changes over time, etc.) Image reading based on the output of reading the standard white board with CCD415 This indicates the degree of amplification (gain) on the mounting plate. i.e. , if the fluorescent lamp 412 is dark, increase the amplification; If the output is too low, lower the amplification to keep the output to the next step constant. Ru.

[0128] ・Signal digitization: Variably amplified analog signals are converted according to AD clock input. is converted into a digital signal by an AD converter, and line A is The signal is output to the image processing circuit 402 side via the image processing circuit 402.

[0129] (7-3) Image processing circuit The image processing circuit (IPU) 402 has five gate arrays 4 as shown in FIG. From 20,421,422,423,424, ROM425 and RAM426 The input from the image reading circuit 401 is processed. Also, the reference clock for these circuits is A clock generation circuit 428 that outputs a lock is provided. Each of these gates The functions of the array are as follows.

[0130] ・First gate array: Light amount detection Shading correction timing control command control Data editing, output CCD drive clock generation ・Second gate array: variable magnification in main scanning direction ・Third gate array: Halftone processing Binarization processing Original size detection ・Fourth gate array: Character/halftone separation Hollow out image ・Fifth gate array: mark area detection Note that the image processing procedure is as shown in FIG. That is, the first and Shading correction is applied to the CCD output in the second gate arrays 420 and 421. After performing MTF correction and scaling in the main scanning direction, the third and fourth Gate arrays 422 and 423 for text mode, photo mode, text photo mode, and hollow and performs processing according to each black and white inversion mode.

[0131] In text mode, it is binarized, and in photo mode, halftone processing is performed using the dither method, and text is In text/photo mode, text and photos are separated, text is binarized, and photos are binarized. After halftone processing using the dither method, output to the copying machine 500 side via line D. Strengthen. In addition, in the case of center cutout, the center is cut out and then converted into a binary value, and in the case of black and white inversion, it is binary is written to the inverter, inverted, and output to the copying machine 500 side via line D. do.

[0132] (7-4) System control circuit As shown in FIG. 53, the system control circuit 504 and the image memory unit 505 It is included in the image information storage device 501 and controls the entire system and reads image information. Provides instructions for reading and writing. Control the entire system and read image information. Extrusion and writing instructions are as follows.

[0133] ・Overall system control: System readiness monitoring Transfer paper information such as paper size and amount remaining Start reading the original scanner copy mode printer copy mode others ・Image data reading and writing instructions: Understanding remaining memory amount Image data writing and reading instructions Note that the floppy disk drive 70 is included in the control of the entire system. 0, optical disk drive device 800, operating device 503, and sorter/stapler device Needless to say, 900 is also included. The operation device 503 includes an operation control circuit 5. 20, and the operation control circuit 520 controls the LCD 522, Lighting control of the LED 523 is executed. In addition, the sorter/stapler device 900 optionally connected via line H, to this device as shown in Figure 55. includes a sorter/stapler control circuit 901 and a sorter/stapler drive device 902. be caught.

[0134] (7-5) Image memory section The image memory unit 505 is composed of a memory board and a memory control board. Ru. The image signal sent from the reading device 400 via the coaxial cable (line D) The code is sent to a memory section 506 provided on the memory board. This memory section 506 The memory capacity is 16 pieces of 1M bit DRAM, which is 4 pages (506 a, 506b, 506c, 506d), that is, a total of 64 Mbits. This message An outline of the harpoon section is shown in FIG. 57. As can be seen from this figure, this memory section 506 One page 506a is one A4 size page of 217.6 mm x 310.9 mm. For A3 size, two pages are used, for example 506a and 506b. I will do it.

[0135] One memory control board is provided for each memory board, that is, one memory control board is provided. Ru. When writing and reading memory, write and read simultaneously. If there is free memory, that is, there are writable pages, sequential writing is possible. It's becoming more and more immersive. In other words, in this case, the copy start key is turned on. .

[0136] (7-6) Writing device The writing device 507 includes a line driver circuit 508, a laser driver circuit 509, and a laser driver circuit 508. It consists of a laser diode (LD) 510 and a readout synchronization control circuit 511. The signal input from the information storage device 501 side is taken in from line F, and the line driver The laser diode 51 Drive 0. At this time, the read synchronization signal is sent from the read synchronization control circuit 511. output to the laser driver circuit 509 to synchronize the laser, and also to the driving device 51. A write drive signal is sent to the laser driver circuit from the write drive control circuit 513 which is also connected to 2. It outputs to path 509. Further, the write drive control circuit 513 is connected to the laser driver 510. It also outputs drive control signals.

[0137] This writing device 507 uses near infrared rays with a wavelength of 780 nm and a G output of 10 mW. An aAs laser diode 510 is used. This laser diode 510 has the advantage of being small and compact and easy to control. Another drawback is that the output may become unstable due to temperature changes. This temperature change There are two types of heat generation: one is due to self-heating, and the other is due to ambient temperature (outside air temperature). this The heater is placed around the laser diode 510 to minimize the effects of However, if the temperature is below 30°C, the heater is turned on. Also, even if the temperature changes, Monitor light is detected with a detector (photodiode) to ensure constant output It feeds back to the drive current of the laser diode 510, and even if the temperature changes, An automatic power control (APC) circuit is installed to ensure constant output. It's on. Then, every time one line is written, the laser power (APC) is reset. Make a decision.

[0138] (7-7) Write drive control The details of the write drive control circuit 513 in the copying circuit 502 shown in FIG. 54 are shown in FIG. 59. This circuit 513 basically consists of a CPU 530, a ROM 531, an RA M532 and four first to fourth I/O gates 533, 534, 535, 5 36 and the output from each part 543 to be detected is AD converted and input to the CPU 530. an AD conversion input section 537 that inputs input signals, and first and second I/O gates 533 and 534 An input unit 538 inputs outputs from each unit 543 to the input unit 538 and instructions from the CPU 530. In response to control signals from the third and fourth I/O gates 535 and 536 Driver 539 and fourth gate for driving each section 544 to be controlled 536 for driving each section 544 to be controlled according to the drive control signal from 536. It is composed of an H-type driver 540. In addition, ROM531 and RAM5 The bus between 32 and each I/O gate 533, 534, 535, 536 includes a 541 is inserted. The T×D and R×D terminals of the CPU530 are each connected to the system control circuit. Further, reference numeral 542 is a decoder. .

[0139] The signals input to the CPU 530 via the AD conversion input section 537 are Third P sensor 21, 22, 23, output of laser diode 510, fixing thermistor output of the first transfer station 231 and the second transfer station 232; This is the counter electrode output.

[0140] CP from the input section 538 via the first and second I/O gates 533 and 534. Signals from each section 543 input to the U530 or RAM532 side and the driver Each part that supplies drive signals from the driver 539 and the H-type driver 540 is shown in FIG. This is specifically shown in block 9 (543, 544).

[0141] (8) Transcription system Next, each transfer system in the copying machine according to the embodiment will be explained.

[0142] (8-1) Latent image-less development transfer system The latent image-less development transfer system will be explained with reference to FIGS. 1 and 2 described above. Na Oh, this is a duplicate, but Figure 1 shows the state when the second transfer station is on the transfer belt, and Figure 2 shows the state when the second transfer station is on the transfer belt. The second transfer station is shown in a state during corona transfer.

[0143] The flow of transfer paper will be explained below, but as a typical example, start from the paper feed slot at the top. The case of feeding paper will be explained.

[0144] The first transfer paper is fed by the feed roller 201, and the branch paper feed solenoid 1 After branching by a first branching claw 202 linked to Enter. The transfer paper in the conveyance path 203 passes through the intermediate roller 204 and then reaches the registration roller 20. Wait in the 5th section. Detection of the transfer paper is performed by the first registration sensor 9.

[0145] The second transfer paper is transferred at the same time as the first transfer paper at a certain timing from the start of conveyance of the first transfer paper. After the paper is fed by the feed roller 201 and branched by the first branching claw 202, , and enters the transfer paper stack section 211 via the second conveyance path 212. Stack part 2 The leading edge of the transfer paper at 11 is regulated by the second registration roller 206, and the trailing edge of the transfer paper is detected by the first relay sensor 7. The feed at the rear edge of the transfer paper is the first relay sensor 7 is detected by the intermediate roller 207 of the stack section, and the transfer paper is completely transferred. The paper is stored in the paper stack section 211.

[0146] The transfer paper stack section 211 is composed of different inclined surfaces, and is oriented toward the photoreceptor 90 surface. It has a roughly V-shape, and in order to store the sheet in a curved manner in this V-shaped stack, It is designed to increase the space length in the sheet conveyance direction. Also, the star Since an elastic member 208 is provided in the hook part, when the transfer paper is stored in a curved manner, Make sure to hold the transfer paper in the nip of the second registration roller 206 even when Is possible. The first transfer paper is a tie that is synchronized with the leading edge of the image on the photoreceptor 90. It is fed again by the printing process, transferred at the first transfer station 231, and transferred to the first separation station 231. Separation is performed at station 100. The separated transfer paper is transported to the first transport section 209 and The image is then fixed by the fixing unit 190 via the second conveyance unit 210.

[0147] The second transfer paper is formed at a timing synchronized with the leading edge of the image formed immediately after the first transfer paper image. The image is fed again at the second transfer station 232, and the transfer is performed at the second transfer station 232. separation The subsequent transfer paper passes through the third transport section 234 and is fixed at the fixing section 190.

[0148] Next, the relationship between the latent image on the photoreceptor 90 (including after development) and the transfer paper will be described.

[0149] Latent images are formed on the photoreceptor 90 at minute intervals with almost no gaps between latent images. So The latent image is transferred alternately by the first and second transfer stations 231 and 232. The aim is to increase the number of copies per unit time by making the transfer paper interval minute. There is. In the conventional method with only one transfer station, the resist tone of the transfer paper is It is not possible to prevent transfer paper gaps from occurring due to the transfer paper stop time during alignment. 1st, 2nd The transfer paper feed order for the second time is that the transfer paper corresponding to the latent image formed second is formed first. The transfer paper corresponding to the formed latent image is sent out before the transfer paper, and the first transfer paper is first transferred to the second transfer paper. It is fed to the stack section 211 via the conveyance path 212, and then transferred to the first conveyance path 20. You may send out the second transfer paper to step 3.

[0150] Next, the configuration of the transport route will be described.

[0151] The path length of the first conveyance path 203 is the maximum transfer paper that can be stored in the transfer paper stack section 211. It is set longer than the size, and is completely within the first conveyance path 203 when waiting for registration. will be stored in.

[0152] Transfer paper stack section 211, second transfer station 232, and third conveyance section 2 34 is held by a holding means (not shown) and set to be removable, and is attached to the first transfer station. It is also possible to use only the Shion 231. Also, at this time, the first Mode selection is set for only the transfer station 231.

[0153] Between the first transfer station 231 and the second transfer station 232 on the photoreceptor 90 The distance is longer than the maximum transfer paper size stored in the transfer paper stack section 211. Even if development is performed without latent image spacing, two transfer stations can transfer the image. It is possible to do this.

[0154] Between the first transfer station 231 and the second transfer station 232 on the photoreceptor 90 The distance between the second transfer station 232 and the fixing nip (the distance between the third conveyance section 234 and The distance between the first transfer station 231 and the first and second transport sections 209, 2 The configuration is equal to the interval via 10. Also, the photoreceptor linear velocity and the first, second, 3 conveyance units 209, 210, 234, first and second registration rollers 205, 20 The linear velocities of 6 are approximately equal values. That is, the first transfer paper is transferred to the first transfer station. 231 and is fixed via the first and second conveyance sections 209 and 210, the first transfer The trailing edge of the photo paper is transferred at the second transfer station 232 and then transferred through the third conveyance section 234. The second transfer paper is located at almost no interval from the leading edge of the second transfer paper to which the transfer paper is fixed. This transfer paper spacing is approximately equal to the interval between latent images. However, due to transport slips, etc., the interval may be slightly longer than the latent image interval. There are cases where the transfer paper interval is wider, but the interval is minute.

[0155] Up to the first and second registration rollers 205 and 206 of the first transfer paper and second transfer paper The linear speed of Has twice the linear speed (feed roller 201, intermediate roller 1 (204), intermediate roller 2 (213), the linear velocity of the stack section intermediate roller 207). These rollers 201 , 204, 213, 207 is approximately twice the linear velocity of the photoreceptor 90. , it is possible to prevent contact between the transfer papers at the intersection A of the first transfer paper and the second transfer paper. Ru. That is, at intersection A, the second transfer paper passes in front of the first transfer paper. 3rd, 4th The transfer paper also passes through the same route as the first and second transfer papers to the first transfer station and the second transfer station, respectively. Transfer is performed sequentially at stations 231 and 232. Details of the transfer paper transport timing will be explained later. Please refer to the timing chart above.

[0156] (8-2) 1 latent image (development) 2 transfer paper system This imaging system applies approximately twice the amount of toner to the photoconductor in advance as in normal mode. Approximately 30 to 50% of the toner is transferred to the first transfer paper at the first transfer station 231. The second transfer station 232 transfers the remaining toner to the second transfer paper. be. The transfer current of the first transfer station 231 at this time is determined by the first transfer station 231. Measuring the state of the transfer paper using the counter electrode 230 for measuring the distribution ratio of the transfer station 231) or the second transfer station 232 By using the transfer belt 233, the measurement pattern can actually be placed on the transfer belt 233. This is transferred, and the transfer efficiency is evaluated using the first to third P sensors of the reflective sensor. A method for determining the value of the second transfer station 231 by calculating with the sensors 22, 21, and 23. There are laws, as mentioned above. In addition, the latent image (development) when using the 2-transfer system The image interval is determined by adding a minute interval to the length of the transfer paper.

[0157] The conveyance path of the first transfer paper and the second transfer paper is the aforementioned latent image gapless development transfer system. However, when the first and second transfer sheets are conveyed at the leading edge timing of each image, the first and second transfer sheets 2 Because the leading edges of the transfer paper are in the same position (overlapping), it is necessary to stop the transfer paper on the transport path. be. The stopping time (distance) at this time is determined by adding a minute interval (interval between latent images) to the length of the transfer paper. Interval (when the transfer paper transferred at the second transfer station 232 enters between the latent image intervals) It is carried out at intervals (including intervals). The transfer paper is stopped at the first transfer station 231. This is done using a photocopied transfer paper. The first conveyance section 209 and the second conveyance section on the first transfer paper path A trailing edge detection sensor 5 is installed between 210 and 210 to detect the trailing edge of the transfer paper. Stop the transport section. In addition, the second conveyance section 210 includes one latent image (development) and two transfer systems. The conveyance length should be such that the maximum transfer paper size can be sufficiently stopped. In this case, the first transcription Because the paper (odd-numbered transfer paper) stops on the second conveyance unit, it is conveyed immediately after the second transfer paper. will be done.

[0158] (8-3) During normal mode transfer For transfer paper sizes of A4 portrait or larger (in the embodiment, the transfer paper stack section 211 (Since the maximum storage size is A4 portrait), the transfer paper cannot be stored in the transfer paper stack section 211. Therefore, it is impossible to make the transfer paper interval (after fixing) minute. This results in The first and second transfer stations 231 and 232 do not perform transfer alternately. , transfer is performed at one of the transfer stations. Usually the first transfer station 231, and if an abnormality occurs in the first transfer station 231, A second transfer station 232 is configured for use. In this mode , the transfer paper is not completely stored in the transfer paper stack section, but is kept waiting in the registration section for refeeding. do.

[0159] (8-3-1) When double-sided The aforementioned latent image gapless development transfer paper system and 1 latent image (development) 2 transfer system It is possible to perform automatic duplex (reverse paper ejection) in the system.

[0160] In other words, the transfer paper discharged by the paper discharge roller 214 after fixing is transferred to the branch paper discharge solenoid. 101, and a third conveyance path 216 when double-sided copying is performed. transported to. Branching and reversing solenoid 1 downstream via the roller on the third conveyance path 216 It is transported through the fourth transport path 218 by the third branch claw 217 linked to the The rollers 251 discharge the material to the double-sided stack section 250.

[0161] The linear velocity of the feed roller is 4 The rollers in the upper middle part of the conveyance path 218 have a photoconductor linear velocity, and the other rollers have a photoconductor linear velocity of approximately 2 (Registration rollers 205 and 206 have photoreceptor linear velocity). When printing on both sides, the gap between the transfer sheets Because the spacing is extremely small, when double-sided stacking occurs, the transfer paper goes under the previous transfer paper. There is a risk that the page order will be reversed.

[0162] In this machine, as mentioned earlier, the downstream roller of the fourth conveyance path 218 (towards the double-sided stack section) (ejection roller) and have a linear velocity approximately twice that of the upstream roller. This has the effect of widening the interval between transfer sheets, and can prevent the page order from being reversed.

[0163] The trailing edge of the transfer paper discharged to the duplex stack section 250 is detected by the duplex paper ejection sensor 6. The re-feed is performed by the shifting roller 219 linked to the shifting roller solenoid 106. The jogger 22 is fed in the direction of the roller 220 and is linked to the jogger motor 107. Jogging will be held at 1. After being jogged, the pinch solenoid 150 When activated, the call lever 229 comes into contact with the call roller 222. call at the same time The solenoid 109 turns on and prepares to feed paper.

[0164] Next, when the conveyance motor is turned on, the transfer paper is conveyed sequentially. When double-sided, branch double-sided Delivered to the fifth conveyance path 224 by the fourth branch claw 223 linked to the lenoid 110 be done.

[0165] When the paper is reversely ejected, it is sent out to the sixth conveyance path 225 by the fourth branch claw 223 and separated. From the fifth branch pawl 226 linked to the branch reversal solenoid 120 to the seventh conveyance path 227 The paper is transported and ejected. At this time, the contact/separation roller 228 is activated by the contact/separation solenoid 103. is pressurized.

[0166] (8-3-2) When reversing normal mode In the normal mode, it is impossible to store transfer paper in the double-sided stack section 250. To avoid this, the transfer paper is reversed at a separate location.

[0167] The third conveyance path 21 is operated by the second branch claw 215 linked to the branch discharge solenoid 101. 6, and is also transferred to the third branch pawl 217 linked to the branch reversal solenoid 102. It is then transported to the seventh transport path 227.

[0168] When the rear end of the transfer paper is detected by the reversal entrance sensor 3, it is connected to the approach/separation solenoid 103. The moved contact/separation roller 228 is pressurized, and the transfer paper is switched back and discharged. At this time, the fifth branch pawl 226 interlocked with the branch/reverse solenoid 102 causes the tip of the transfer paper to be is guided onto the first paper feed cassette 252.

[0169] (9) Operation timing Figure 60 shows the relationship between the operation and timing of the copying machine that copies as described above. This will be explained with reference to the timing chart of FIG.

[0170] (9-1) Timing in A4 landscape, 1:1 copying operation Figures 60 to 6 show the timing when copying one-to-one on A4 horizontal transfer paper. Shown in 2. In operations based on this timing chart, settings such as number of sheets and mode are After finishing, copying starts when copying is possible.

[0171] a. 100ms after the main motor trigger is turned on (motor start-up), remove the transfer paper. Cut the paper feed path on the transfer 1 and 2 (first and second transfer stations 231 and 232) side. Turn on the branch paper feed solenoid 114 to be changed, transfer 1 (first transfer station 231) side (branch paper feed solenoid 114 and first paper feed clamp) The difference in timing of 115 takes into account the delay of the solenoid).

[0172] b. After starting paper feeding, the first paper feeding clutch 115 is activated at a certain timing (370ms). is turned off, but the rollers driven by the first relay clutch 113 turn it off. It is fed to the first registration sensor 9 via the gap sensor 10.

[0173] At the timing when the leading edge of the transfer paper reaches the intermediate sensor 10, the trailing edge of the transfer paper is separated. Because the claw driven by the branch paper feed solenoid 114 is missing, the branch paper feed solenoid Turn off the lenoid 114 and move it to the transfer 2 (second transfer station 232) side. Switch the feed route. At the same time, turn on the first paper feed clutch 115 and start feeding paper. do.

[0174] c. The transfer paper fed to the transfer 2 (second transfer station 232) side is The supply passes through the relay sensor 11 and the second relay sensor 12 to the second registration sensor 4. sent.

[0175] d. The tag being fed to transfer 2 (second transfer station 232) in c above During timing, the transfer 1 (first transfer station 231) side At the start timing, the first resist clutch 111 is turned on and the image forming system is connected. The transfer paper is transported at the same speed.

[0176] e. The leading edge of the transfer paper whose registration was started in step d above is transferred to transfer 2 (second transfer step). 232) and the timing at which the feed path intersects with the feed path is shown. f. Transfer 1 (first transfer station 231) transfers a shape before the toner image to be transferred. The formed toner image is transferred to the resist on the transfer 2 (second transfer station 232) side. The second resist clutch 105 is turned on at the start timing.

[0177] g. On the transfer 1 side, the transfer paper is transported by the registration rollers at the speed of the image forming system, and the transfer paper is When the rear end reaches the intermediate sensor 10, a repeat timing is activated after a certain timing. After a, the repeat copy operation is repeated at the timings a to f. Perform the copy operation for several minutes.

[0178] The above timing describes feeding from the first paper feed, but the second and third paper feed, LCT When feeding transfer paper from Registration linear speed≒(1/2)×feeding linear speed Therefore, the transfer paper is fed to the front of the claw driven by the branch paper feed solenoid 114, By stopping, the timing becomes similar to the above timing. Also, two-page spread For originals (original size: A3 → transfer paper size A4 landscape + A4 landscape), the The ON time of exposure (LD) is only doubled, and the timing of paper feeding and conveyance on the transfer paper side is reduced. The timing shown in the diagram is sufficient.

[0179] (9-2) A4 landscape, timing when copying multiple sheets at the same time Figures 63, 64, and 65 show the timing when copying multiple sheets at the same time on A4 size paper. This is a chart.

[0180] a to e, g are the same as the A4 horizontal 1:1 copy in (8-1) above, so here The explanation will be omitted.

[0181] h. Photoreceptor 9 on which the amount of toner adhesion is increased in advance during charging, exposure, and development The toner image on 0 is transferred to transfer 1 (first transfer station 2) at the timing d. 31) Transfer a part of the toner image to the transfer paper on the side, and rotate the photoreceptor 90 to remove the remaining toner image. The toner image is transferred to the resist on the transfer 2 (second transfer station 232) side. When the start timing comes, the second resist clutch 105 is turned on to the same toner image. N and perform the transfer operation.

[0182] i. The transfer paper on the transfer 2 (second transfer station 232) side is waiting for registration. Since the time is longer, the second registration sensor 4 has a shorter paper interval (OFF) time. However, due to the fall of the second registration sensor 4, the second registration clutch 105 Performs OFF processing.

[0183] j. With the above configuration, two sheets of transfer paper (copies) can be created with one latent image. Therefore, if the set number of sheets is an odd number, the first transfer paper or , final transfer paper image formation, transfer timing, charging, exposure, transfer and other image forming conditions If you change the image forming conditions from the simultaneous multi-sheet transfer condition to the single-sheet transfer (normal copy mode) Ru.

[0184] k. When the trailing edge detection sensor 5 detects the falling edge (the trailing edge of the transfer paper), the conveyance clutch 1 is activated. 04 is turned off and the transfer paper stops on the conveyance section. Transfer from transfer 2 side when stopped The paper is conveyed to the fixing unit and fixed. Therefore, the transfer paper on the transfer 2 side is fixed. After turning on sensor 2, after a certain timing (it stops on the transport unit) Even if the transfer paper is conveyed to the fixing unit, it will not overlap with the transfer paper on the transfer 2 side at the fixing section. ), turn on the conveyance clutch 104 and convey the transfer paper to the fixing unit. Ru.

[0185] (9-2-1) Processing and timing when the number of sheets is odd in simultaneous multi-sheet mode In simultaneous multi-image mode, one latent image creates two copies, so if the number of copies is an odd number, In this case, only the last paper or the first paper is copied with one latent image. Therefore The process conditions are significantly different when copying two sheets and when copying one sheet. So in the example counts the ON times of charging during latent image formation and determines the timing of changing process conditions. Control. In the flowcharts shown in FIGS. 69 to 72, the leading paper has one latent image. This shows a case where a single copy is made from multiple copies (only in simultaneous multi-copy mode). In addition , "SLED" in the flowchart is a simultaneous multi-copy mode of LEDs on the operation panel. It shows the LED of the code.

[0186] In this process, as shown in the flowchart in Figure 69, when copying starts (S69-1) Check whether the jam has been recovered (S69-2), When the jam recovery is completed, the charging counter is reset (S69-3).

[0187] In the charging process in this mode, as shown in the flowchart of FIG. First, at the charging ON timing (S70-1), the charging counter is set to one count. (S70-2) and check whether the SLED is set. (S70-3). If the SLED is set, check whether the number of copies is odd. (S70-4), and if it is an odd number, check whether the charge counter is 1 or not. (S70-5). If the charge counter is not 1, the condition for simultaneous multi-copying is issued. Then, the photoreceptor 90 is charged (S70-6) and the process returns. If step S If the number set in step S70-4 is an even number, skip step S70-5 and proceed to step S70-4. Step S70-6 is executed. Also, the SLED is set in step S70-3. If the charge counter is not set to 1 in step S70-5, If there is no charge, it is charged as is (S70-7) and the process returns.

[0188] On the other hand, regarding the developing bias, as shown in the flowchart of FIG. At the time the signal is turned ON (S71-1), check whether the SLED is set or not. Check (S71-2), and if it is set, set the number of copies to an odd number. It is checked whether or not it has been set (S71-3). If it is set to an odd number, For example, check whether the charge counter is set to 1 (S71-4) and print multiple sheets at the same time. The developing bias is turned ON under the condition (S71-5) and the process returns. If the above If the number set in step S71-3 is an even number, skip step S71-4. The process of step S71-5 is executed. Also, in step S71-2, the SLED If it is not set, and the counter becomes 1 in step S71-4. If so, the developing bias is turned on (S71-6) and the process returns.

[0189] Furthermore, regarding the control procedure of the laser diode, as shown in FIG. When the timing comes (S72-1), check whether the SLED is set. (S72-2), and if it is set, check whether the number set is an odd number. (S72-3). If there are an odd number of sheets, the charge counter will become 1. (S72-4), and if it is not 1, the simultaneous multi-sheet mode is activated. The laser diode is turned on under the following conditions (S72-5), and the process returns. If the station If the number of sheets is an even number in step S72-3, skip step S72-4. Then, the process of step S72-5 is executed. Also, in step S72-2, SLE When D is not set, and in step S72-4, the charge counter is set to 1. If not, turn on the laser diode and return (S 72-6).

[0190] (9-3) Copy timing for A4 landscape, inverted, and double-sided portions Figures 66, 67, and 68 show timings for copying A4 landscape, inverted, and duplex sections. This is a running chart.

[0191] l. The fused transfer paper is delivered to a claw driven by a branch paper ejection solenoid 101. The conveyance speed is increased through the internal path of the machine and the duplex unit (duplex ejection sensor) released.

[0192] m. The fall (during ejection) of the double-sided paper ejection sensor 6 is detected by the alignment means (jiyogi) described below. This serves as a reference for the timing of Sensor 6 falls at the same time as Corosoreno (Due to the solenoid delay time, the shaded area in the diagram is the actual approach.) Operation of rolling roller 219) Move the transfer paper toward the paper refeeding port.

[0193] n. After another 150ms, the Jiyoga motor 107 moves the Jiyoga for alignment. - (Fence) Move 221 to the forward side (direction to arrange the paper). arrangement 150ms after that, Jiyogar (Fuens) is activated by Jiyogar motor 107. Move 221 to the return side (evacuation side).

[0194] o. When reversing (when paper is ejected from the back side), a call for refeeding is made at the same time as timing n. Solenoid 109, pinch roller solenoid 150, paper refeed motor 108 Turns on and paper refeeding starts. (The diagonal line (dashed line) in the figure is the delay of the above load. , and rise time)) When duplexing, the duplex paper ejection sensor 6 detects all the transfer paper. The paper will not be re-feeded until it is ejected.

[0195] p. Refeed mode for duplex Same timing as shown in n.

[0196] q. The paper refeed motor 108 is turned off at the fall of the next transfer paper (at the time of ejection). This is because the mode is transferred to the alignment means.

[0197] In addition, the state of the transfer paper corresponding to the timing charts shown in FIGS. 60 to 62 are shown in FIGS. 73 to 79.

[0198] In FIG. 73, the leading edge of the transfer paper P1 has reached the intermediate sensor 10, and the transfer paper P2 has reached the paper feed tray. FIG. 74 shows a state where the transfer paper P1 is waiting in the first registration sensor 921. 9, the transfer paper P2 is pulled out by the feed roller 201, and the transfer paper P2 is pulled out by the feed roller 201. FIG. 75 shows the state in which the tip of the transfer paper P1 has reached the position of the first branch claw 202. contacts the photoconductor 90, and the transfer paper P2 is stacked on the transfer paper stack section 211. The waiting state is shown in FIG. 76 as the timing state of e in the timing chart. That is, the transfer paper P2 is in a registered state with the second registration roller, and the trailing edge is in the A section. FIG. 77 shows the state when the transfer paper P1 enters the first conveyance section 209. The leading edge of the transfer paper P1 reaches the trailing edge detection sensor 5, and the leading edge of the transfer paper P2 reaches the fixing section 19. 78 shows the state when the leading edge of the transfer paper P2 reaches the fixing sensor 2. , FIG. 79 shows the state in which the transfer paper P1 is transported by the second transport section 210. The end reaches the ejection sensor 1, and the transfer paper P1 is conveyed to just before the fixing section 190. The state of each case is shown below.

[0199]

[Effect of the idea]

As is clear from the above explanation, one image information holding medium and one image an image information forming means for continuously forming image information on an image information holding medium; Links the image information formed on the image information holding medium by the information forming means to the recording medium. A first image information transfer means on the upstream side in the conveying direction of the recording medium that continuously transfers the image information, and a downstream side on the recording medium conveyance direction. a second image information transfer means, and a recording medium is continuously transferred along the conveyance path to the first and second image information transfer means. A recording medium transport means for transporting the second image information to the second image information transfer means, and a second image information transfer means for transporting the recording medium to the second image information transfer means. A recording medium storage section formed of slopes with different inclination angles provided in front of the information transfer means. According to the invention described in claim 1, the recording is performed before the second image information transfer means in the conveyance direction. The storage medium can be deformed and placed on standby along the storage medium storage section, making storage easier. The planar projected area of the recording medium when stored in the unit is smaller than the actual area of the recording medium. Therefore, the path length in the transport direction can be shortened and the image forming device can be made smaller. This makes it possible to reduce waste in space.

[0200] In addition, a pressure force is applied to the recording medium storage section to press the recording medium against the recording medium placement surface of the storage section. According to the invention according to claim 2, further comprising means, the recording medium is collected by the pressing means. It can be pressed against the recording medium placement surface of the storage compartment, thereby allowing the recording medium to be placed on the recording medium surface. It is possible to reliably reduce the shadow area.

[Brief explanation of drawings]

FIG. 1 is for explaining an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of a copying apparatus according to an embodiment in which transfer at a transfer station and a second transfer station are both performed by corona discharge.

FIG. 2 is a schematic configuration diagram of a copying apparatus according to an embodiment in which transfer at a first transfer station is performed by corona discharge and transfer at a second transfer station is performed by belt transfer.

FIG. 3 is a schematic configuration diagram of a scanner section that employs a digital optical system according to an embodiment.

FIG. 4 is a perspective view showing a schematic configuration diagram of a scanner driving section that drives a scanner section.

FIG. 5 is a schematic configuration diagram showing an outline of a writing section.

FIG. 6 is an explanatory diagram showing a schematic configuration of an analog optical system for writing.

FIG. 7 is an explanatory diagram showing the image forming potential and timing on the surface of the photoreceptor in the image forming process during image area exposure.

FIG. 8 is an explanatory diagram showing the relationship between control items and charging potential in the image forming process during image area exposure.

FIG. 9 is an explanatory diagram showing the image forming potential and timing in the image forming process of non-image area exposure.

FIG. 10 is an explanatory diagram showing the relationship between control items and image forming potentials in the image forming process of non-image area exposure.

FIG. 11 is a circuit diagram showing a transfer paper state environment detection circuit.

FIG. 12 is a characteristic diagram showing the relationship between transfer drum current and transfer efficiency.

13 is a schematic configuration diagram showing the configuration around the transfer belt in FIG. 1. FIG.

FIG. 14 is a characteristic diagram showing toner concentration and sensor potential level used for calculating transfer efficiency.

FIG. 15 is a flowchart showing a part of the control procedure of transfer current control when a corona discharge method is adopted at the first transfer station and the second transfer station in the 1-development, 2-transfer mode.

FIG. 16 is a characteristic diagram showing the relationship between the transfer drum current of the first transfer station and the transfer efficiency of the first transfer station.

FIG. 17 is a flowchart showing a part of the control procedure of transfer current control when a corona discharge method is adopted at the first transfer station and the second transfer station in the 1-development, 2-transfer mode.

FIG. 18 is a flowchart showing a part of the control procedure of transfer current control when a corona discharge method is adopted at the first transfer station and the second transfer station in the 1-development, 2-transfer mode.

FIG. 19 is a flowchart showing a part of the control procedure of transfer current control when a corona discharge method is adopted at the first transfer station and the second transfer station in the 1-development, 2-transfer mode.

FIG. 20 is a flowchart showing a part of the control procedure of transfer current control when a corona discharge method is adopted at the first transfer station and a belt transfer method is adopted at the second transfer station in the 1-development, 2-transfer mode.

FIG. 21 is a flowchart showing a part of the control procedure of transfer current control when a corona discharge method is adopted at the first transfer station and a belt transfer method is adopted at the second transfer station in the 1-development, 2-transfer mode.

FIG. 22 is a flowchart showing a part of the control procedure for transfer current control when a corona discharge method is adopted at the first transfer station and a belt transfer method is adopted at the second transfer station in the 1-development, 2-transfer mode.

FIG. 23 is a flowchart showing a part of the control procedure of transfer current control when a corona discharge method is adopted at the first transfer station and a belt transfer method is adopted at the second transfer station in the 1-development, 2-transfer mode.

FIG. 24 is a flowchart showing a procedure for cleaning the transfer charger, wire, and casing.

FIG. 25 is a timing chart showing the relationship between the return position and home position and the rotational direction and timing of the motor.

FIG. 26 is a flowchart showing a procedure for calculating a transfer current distribution ratio.

FIG. 27 is a flowchart showing a part of the control procedure for initial transfer current control when a corona discharge method is adopted at the first transfer station and a belt transfer method is adopted at the second transfer station in the 1-development, 2-transfer mode.

FIG. 28 is a characteristic diagram for configuring the table for calculating the transfer efficiency of the first transfer station from the transfer efficiency of the second transfer station and the table.

FIG. 29 is a characteristic diagram showing the relationship between transfer drum current and transfer efficiency.

FIG. 30 is a flowchart showing part of the control procedure when calculating the transfer efficiency of the second transfer station using the first and second P sensors.

FIG. 31 is a flowchart showing part of the control procedure when calculating the transfer efficiency of the second transfer station using the first and second P sensors.

FIG. 32 is a flowchart illustrating a processing procedure for checking data capture timing in paper type detection.

FIG. 33 is a flowchart showing a processing procedure for data acquisition in paper type detection.

FIG. 34 is a flowchart showing a procedure for determining a transfer current.

FIG. 35 is a characteristic diagram for creating a table for calculating a transfer current standard value, showing the relationship between transfer efficiency and transfer drum current.

FIG. 36 is a characteristic diagram for calculating whether average paper type data and standard paper type data are equal, and shows the relationship between the potential of average paper type data and transfer drum current.

FIG. 37 is a diagram showing the relationship between the potential difference in paper type data and the current difference in transfer drum current.

FIG. 38 is a characteristic diagram showing the relationship between transfer drum current difference and transfer efficiency depending on the paper type.

FIG. 39 is a flowchart showing a general control procedure for copy mode selection.

FIG. 40 is a flowchart showing a part of the control procedure of automatic selection copy mode selection processing.

FIG. 41 is a flowchart showing a part of the control procedure of automatic selection copy mode selection processing.

FIG. 42 is an explanatory diagram of an operation panel.

FIG. 43 is a flowchart showing a part of the control procedure of manual selection copy mode selection processing.

FIG. 44 is a flowchart showing a part of the control procedure of manual selection copy mode selection processing.

FIG. 45 is a flowchart showing a part of the control procedure of manual selection copy mode selection processing.

FIG. 46 is a flowchart showing a part of the control procedure of manual selection copy mode selection processing.

[Figure 47] FLED, SLED, FSL on the operation panel
It is an explanatory view showing light emission rotation of LED of ED.

FIG. 48 is a flowchart showing the contents of a counter check subroutine.

FIG. 49 is a control block diagram of the entire copying machine according to the embodiment.

FIG. 50 is a block diagram showing details of a reading control circuit and an ADF device.

FIG. 51 is a block diagram showing details of an image reading circuit.

FIG. 52 is a block diagram showing details of an image processing circuit.

FIG. 53 is a block diagram showing details of an image information storage device including a system control circuit and an operating device.

FIG. 54 is a block diagram showing a write drive control circuit in the copying circuit.

FIG. 55 is a block diagram showing details of the sorter/stapler device.

FIG. 56 is a diagram showing the procedure of image processing in the image processing circuit.

FIG. 57 is an explanatory diagram schematically showing a memory map of the image memory section.

FIG. 58 is a block diagram showing details of a portion of the write drive control circuit in the copying circuit.

FIG. 59 is a block diagram showing details of a portion of the write drive control circuit in the copying circuit.

FIG. 60 is a timing chart showing the timing when copying one-to-one on A4 horizontal transfer paper, and FIG.
FIG. 62 shows the timing of the entire process.

FIG. 61 is a timing chart showing the timing of one-to-one copying on A4 horizontal transfer paper.

FIG. 62 is a timing chart showing the timing of one-to-one copying on A4 horizontal transfer paper.

FIG. 63 is a timing chart showing the timing when making multiple copies simultaneously on A4 horizontal transfer paper; FIGS. 64 and 65 show the timing of the entire process.

FIG. 64 is a timing chart showing the timing when making multiple copies simultaneously on A4 horizontal transfer paper.

FIG. 65 is a timing chart showing the timing when making multiple copies simultaneously on A4 horizontal transfer paper.

FIG. 66 is a timing chart showing the timing when reversing and making a double-sided copy on A4 horizontal transfer paper, and FIGS. 67 and 68 are timing charts for the entire process.

FIG. 67 is a timing chart showing the timing when reversing and making a double-sided copy on A4 horizontal transfer paper.

FIG. 68 is a timing chart showing the timing when making a double-sided copy by inverting it onto A4 horizontal transfer paper.

FIG. 69 is a flowchart showing the processing procedure when the number of copies is an odd number when making multiple copies simultaneously on A4 horizontal transfer paper.

FIG. 70 is a flowchart showing the charging process procedure when the number of copies is an odd number when making multiple copies simultaneously on A4 horizontal transfer paper.

FIG. 71 is a flowchart showing a developing bias control procedure when the number of copies is an odd number when making multiple copies simultaneously on A4 horizontal transfer paper;

FIG. 72 is a flowchart showing a laser diode control procedure.

73 is an explanatory diagram illustrating the state of the transfer paper corresponding to the timing charts of FIGS. 60 to 62, and shows a state in which the leading edge of the transfer paper P1 has reached the intermediate sensor. FIG.

74 is an explanatory diagram illustrating the state of the transfer paper corresponding to the timing charts of FIGS. 60 to 62, and shows a state in which the transfer paper P1 has reached the first registration sensor. FIG.

75 is an explanatory diagram illustrating the state of the transfer paper corresponding to the timing charts of FIGS. 60 to 62, and shows a state in which the transfer paper P1 is in contact with the photoreceptor. FIG.

76 is an explanatory diagram illustrating the state of the transfer paper corresponding to the timing charts of FIGS. 60 to 62, and shows the state of the timing e in the timing chart. FIG.

77 is an explanatory diagram illustrating the state of the transfer paper corresponding to the timing charts of FIGS. 60 to 62, and shows a state in which the leading edge of the transfer paper P1 has reached the trailing edge detection sensor. FIG.

78 is an explanatory diagram illustrating the state of the transfer paper corresponding to the timing charts of FIGS. 60 to 62, and shows a state in which the leading edge of the transfer paper P2 has reached the fixing sensor. FIG.

79 is an explanatory diagram illustrating the state of the transfer paper corresponding to the timing charts of FIGS. 60 to 62, and shows a state in which the leading edge of the transfer paper P2 has reached the ejection sensor. FIG.

[Explanation of symbols]

90 Photoreceptor 206 Registration roller 208 Elastic member 211 Transfer paper stack section 231 1st transfer station 232 Second transfer station 504 System control circuit 507 Writing device 909 Writing optical system 910 Developing section 920 Cleaning Department 940 Charger 950 Imaging system 960 Transport system P1 1st transfer paper P2 2nd transfer paper

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Kazuyuki Nakahara 1-3-6 Nakamagome, Ota-ku, Tokyo Stocks Within the company Ricoh

Claims (2)

[Scope of utility model registration request] Claim 1. An image forming apparatus that transfers image information formed on an image information holding medium to a recording medium using an image information transfer means to form an image on the recording medium. an image information holding medium; an image information forming means for continuously forming image information on the one image information holding medium; and a recording medium for transferring the image information formed on the image information holding medium by the image information forming means to a recording medium. A first image information transfer means on the upstream side in the recording medium conveyance direction and a second image information transfer means on the downstream side in the conveyance direction of the recording medium, and continuously transfer the first and second images to the recording medium along the conveyance path. recording medium transport means for transporting each to the information transfer means;
An image forming apparatus comprising: a recording medium storage section formed of slopes having different inclination angles and provided in front of a second image information transfer means. 2. The image forming apparatus according to claim 1, wherein the recording medium storage section further includes a pressing means for pressing the recording medium against a recording medium placement surface of the storage section.