CN116009370A

CN116009370A - Sheet discharge control method, apparatus and computer readable storage medium

Info

Publication number: CN116009370A
Application number: CN202211717128.0A
Authority: CN
Inventors: 李荣华; 梁煜林
Original assignee: Zhuhai Pantum Electronics Co Ltd
Current assignee: Zhuhai Pantum Electronics Co Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-04-25

Abstract

The invention discloses a sheet discharge control method, a sheet discharge control device and a computer readable storage medium, and relates to the technical field of image forming devices. The sheet discharge control method includes: when the printing linear speed is lower than the preset speed, acquiring a sheet position and/or acquiring an image position; the timing of acceleration of the conveyance motor and the timing of recovery of the conveyance motor are controlled in accordance with the sheet position and/or the image position, and the conveyance motor is used to convey the sheet from the paper path to the sheet discharge tray. When the printing linear speed is lower than the preset speed, the invention controls the acceleration time of the conveying motor and the recovery time of the conveying motor by acquiring the sheet position and/or the image position, thereby ensuring that various types of sheets can be smoothly discharged from the paper discharge roller, ensuring the sheet material volume and the uniformity of the sheets on the paper discharge tray, and avoiding the problem of paper jam in discharge.

Description

Sheet discharge control method, apparatus and computer readable storage medium

Technical Field

The present invention relates to the field of image forming apparatuses, and more particularly, to a sheet discharge control method, apparatus, and computer-readable storage medium.

Background

In the prior art, when printing sheets such as small-size paper types, special paper types (not limited to thick paper, envelopes, label paper, films, cards and the like), and specific printing modes (not limited to a low-speed printing mode such as a mute mode and a high-resolution printing mode), in order to ensure an image fixing effect, the printing linear speed is reduced, and after the speed is reduced, the sheet tail end is not fragile when falling down during discharging, sheet curl is easy to occur, so that a paper discharging mechanism cannot normally discharge sheets, the sheet tail end cannot normally fall to a paper discharging tray, and the sheet stacking property of the paper discharging tray and the sheet uniformity are poor.

In addition, if the water content of any paper type sheet on the fixing roller is large under the environment of high temperature and high humidity, the sheet becomes curved after being heated by the fixing roller in the slow printing mode, and can pass through the paper discharge roller, and only the sheet is easily blocked at the paper outlet after the curved amount is large, thereby generating the phenomenon of paper discharge jam.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide a sheet discharging control method, a device and a computer readable storage medium, which solve the problems that the tail end of a sheet cannot be normally discharged from a paper discharging roller in the scene and is put on the paper discharging roller, and the former sheet can be pushed out by the latter sheet to influence the loading quantity and the uniformity of the discharged paper; in addition, in a high-temperature and high-humidity environment, the sheet has a large water content, and after being heated by the fixing roller, the sheet bends, and the sheet bends by a large amount, and then the paper outlet is easily blocked, which causes a problem of paper jam.

According to a first aspect of the present invention, there is provided a sheet discharge control method comprising

When the printing linear speed is lower than the preset speed, acquiring a sheet position and/or acquiring an image position;

the timing of acceleration of the conveyance motor and the timing of recovery of the conveyance motor are controlled in accordance with the sheet position and/or the image position, and the conveyance motor is used to convey the sheet from the paper path to the sheet discharge tray.

According to the sheet discharge control method, when the printing linear speed is lower than the preset speed, the timing of acceleration of the conveying motor and the timing of recovery of the conveying motor are controlled by acquiring the sheet position and/or the image position, so that various types of sheets can be smoothly discharged from the paper discharge roller, the sheet material volume capacity and the uniformity of the sheets in the paper discharge tray are ensured, and the problem of discharge paper jam is avoided.

In some embodiments, controlling the timing of the conveyor motor acceleration and timing of the conveyor motor recovery speed includes:

acquiring the position of the sheet relative to the discharge roller or the position of the sheet relative to the fixing roller and the discharge roller according to the position of the sheet;

the timing of acceleration of the conveyance motor and the timing of recovery of the conveyance motor are controlled according to the position of the sheet with respect to the discharge roller, or the position of the sheet with respect to the fixing roller and the discharge roller.

In some embodiments, acquiring the position of the sheet relative to the discharge roller, or the position of the sheet relative to the fixing roller and the discharge roller, based on the position of the sheet, includes:

the position of the sheet with respect to the discharge roller, or the position of the sheet with respect to the fixing roller and the discharge roller is determined by one or more of timing of paper feeding on the paper path, detection of the position of the sheet, issuing of print data, relative position of the paper path sensor, actual mechanical distance of the sheet with respect to the fixing roller and the discharge roller, and length of the sheet.

acquiring the position of the image position relative to the discharge roller or the position of the image position relative to the fixing roller and the discharge roller based on the image position;

the timing of acceleration of the conveying motor and the timing of recovery of the conveying motor are controlled based on the position of the image position relative to the discharge roller or the position of the image position relative to the fixing roller and the discharge roller.

In some embodiments, the transport motor is also used to drive the fusing roller.

According to a second aspect of the present invention, there is provided an image forming apparatus including:

the paper path sensor is used for acquiring a sheet position and/or an image position when the printing linear speed is lower than a preset speed;

a conveying motor for conveying the sheet from the paper path to the sheet discharge tray;

and the control module is used for controlling the acceleration time of the conveying motor and the recovery speed time of the conveying motor according to the sheet position and/or the portrait position.

In some embodiments, the method comprises:

the control module obtains the position of the sheet relative to the paper discharge roller or the position of the sheet relative to the fixing roller and the paper discharge roller according to the position of the sheet;

the control module controls timing of acceleration of the conveyance motor and timing of recovery of the conveyance motor according to the acquired position of the sheet relative to the discharge roller, or the position of the sheet relative to the fixing roller and the discharge roller.

In some embodiments, the method comprises:

the control module obtains the position of the image position relative to the paper discharge roller or the position of the image position relative to the fixing roller and the paper discharge roller according to the image position;

the control module controls timing of acceleration of the conveying motor and timing of recovery of the conveying motor based on a position of the acquired image position relative to the discharge roller or a position of the image position relative to the fixing roller and the discharge roller.

In some embodiments, a transport motor is used to drive the fusing roller.

According to a third aspect of the present invention, there is provided a computer-readable storage medium including a stored program, wherein the apparatus on which the computer-readable storage medium is controlled to execute the above-described sheet discharge control method when the program is run.

Compared with the prior art, the sheet discharge control method, the device and the computer-readable storage medium can ensure that various types of sheets can be smoothly discharged from the paper discharge roller, ensure the sheet material volume and the uniformity of the sheets on the paper discharge tray, and simultaneously avoid the problem of discharge paper jam. After the former sheet is discharged quickly, the speed of the conveying motor is recovered, preparation can be made for printing the latter sheet, and the small-size continuous printing efficiency is improved.

Drawings

Fig. 1 is a cross-sectional view of an image forming apparatus of the present invention;

fig. 2 is a flowchart of a sheet discharge control method according to an embodiment of the present invention;

FIG. 3 is a flow chart of controlling timing of acceleration of a conveyor motor and timing of recovery of the conveyor motor according to an embodiment of the invention;

fig. 4 is a flowchart of a sheet discharge control method according to another embodiment of the present invention;

fig. 5 is a flowchart of controlling timing of acceleration of the conveyor motor and timing of recovery of the conveyor motor according to another embodiment of the present invention.

Reference numerals illustrate: the image forming apparatus 100, the photosensitive drum 101Y-K, the charging roller 102Y-K, the developing roller 103Y-K, the hopper 104Y-K, the transfer belt 105, the secondary transfer roller 106, the paper feed cassette 107, the manual paper feed tray 108, the pickup roller 109, the conveying roller 110, the laser scanning unit 111, the fixing roller 112, the pressing roller 113, the paper discharge roller 114, the paper discharge tray 115, and the paper path sensor 120G-H.

Detailed Description

The following describes in detail a sheet discharge control method, apparatus, and computer-readable storage medium provided by the embodiment of the present invention in connection with the embodiment.

Fig. 1 is a schematic view of an image forming apparatus according to an embodiment of the present invention.

As shown in fig. 1, an image forming apparatus 100 is used to execute an image forming job such as generating, printing, receiving, and transmitting image data, and examples of the image forming apparatus 100 include printers, scanners, copiers, facsimile machines, and multifunction peripherals (MFP, multi-Functional Peripheral) that perform the above functions in a single device.

As an example of an image forming apparatus 100, the image forming apparatus 100 includes a photosensitive drum 101Y-K, a charging roller 102Y-K, a developing roller 103Y-K, a powder hopper 104Y-K, a transfer belt 105, a secondary transfer roller 106, a paper feed cassette 107, a manual paper feed tray 108, a pickup roller 109, a conveying roller 110, a paper path sensor 120G-H, a laser scanning unit (LSU, laser ScanningUnit) 111, a fixing roller 112, a pressing roller 113, a paper discharge roller 114, a paper discharge tray 115, and the like. Generally, the process cartridges C-M include a photosensitive drum 101Y-K, a charging roller 102Y-K, a developing roller 103Y-K, and a toner hopper 104Y-K for holding toner, respectively.

LSU 111 is in the form of a single LSU comprising four beam optical paths. The four charging rollers 102Y-K are used for charging the surfaces of the four photosensitive drums 101Y-K, respectively, the four light paths of the LSU 111 emit laser beams to form electrostatic latent images on the surfaces of the photosensitive drums 101Y-K, respectively, the four developing rollers 103Y-K are used for developing the surfaces of the photosensitive drums 101Y-K to form toner images of one color, respectively, the image forming apparatus 100 adopts a secondary transfer mode, that is, the four photosensitive drums 101Y-K transfer the toner images onto the transfer belt 105 in sequence, and then the color toner images formed on the transfer belt 105 are transferred onto a sheet secondarily via the secondary transfer roller 106. The sheet cassette 107 is used to store sheets, and the pickup roller 109 is used to convey the stored sheets to a conveyance path (i.e., a paper path described later). The conveying roller 110 is used to convey the sheet to the secondary transfer roller 106.

The secondary transfer roller 106 conveys the imaged sheet to a nip region of a fixing roller 112 and a pressing roller 113, the fixing roller 112 and the pressing roller 113 are used for fixing the toner image on the sheet, the fixing roller 112 may adopt a ceramic heating method, the fixing roller 112 and the pressing roller 113 convey the sheet after fixing to a discharge roller 114, and the discharge roller 114 discharges the sheet to a discharge tray 115 and stacks.

Wherein the laser scanning unit 111 acquires an optical analog image signal of an original/source document by exposure of an optical print head. The paper path sensor 120G-H is configured to detect whether a leading end or a trailing end of a sheet passes through a position on the paper path corresponding thereto, the paper path sensor 120G may be disposed at any position between the paper path fixing roller 112 and the paper discharge roller 114, the paper path sensor 120G is configured to detect whether the leading end or the trailing end of the sheet passes through the position, the paper path sensor 120H is disposed at a position corresponding to the paper path conveying roller 110, and the paper path sensor 120H is configured to detect whether the leading end or the trailing end of the sheet passes through the position, and it should be noted that the paper path sensor may be disposed in any number and at any position on the paper path as required.

The paper feeding cassette 107 is provided with a paper outlet, the pickup roller 109 is specifically configured to feed the sheets contained in the paper feeding cassette 107 from the paper outlet into a paper path for transfer, the image forming apparatus 100 further includes a conveying motor (not shown) for driving the pickup roller 109 to operate, the conveying motor is configured to drive the pickup roller 109 to move so as to implement a paper pickup operation, and the conveying motor is also configured to drive the conveying roller 110, the fixing roller 112, the paper discharge roller 114, etc. to move, so that the image forming apparatus can be miniaturized and the cost can be reduced. The conveyance motor is electrically connected to a control module (not shown) of the image forming apparatus 100 to control operation of the conveyance motor. The control module is electrically connected with the paper path sensor 120, and the paper path sensor 120 sends detection result information to the control module. It should be noted that the number of the conveying motors may be plural, and each conveying motor may drive a different motion module, for example, the fixing roller 112 may be driven by a separate conveying motor, and the paper discharge roller 114 may be driven by a separate conveying motor.

The image forming apparatus 100 further includes an operation panel (not shown) including an operation portion (not shown) constituted by various keys and a touch panel type display portion (not shown).

It is to be understood that the above-listed image forming apparatus 100 is only an example, and the component configuration and component arrangement of the image forming apparatus 100 may be adjusted according to the actual situation without affecting the improved idea of the present invention.

Fig. 2 schematically shows a sheet discharge control method according to an embodiment of the present invention, which can be used to control the image forming apparatus 100. As shown in fig. 2, the sheet discharge control method includes the steps of:

s110: when the printing linear velocity is lower than the preset velocity, the sheet position is acquired.

In the present embodiment, when the image forming apparatus 100 prints a sheet of a small size, a special paper type (not limited to thick paper, envelopes, label paper, films, cards, etc.), or a specific print mode (not limited to a silent mode, a high-resolution print mode, etc.), the image forming apparatus 100 may decrease the print line speed (i.e., the image forming apparatus 100 is in the slow print mode) in order to secure the image fixing effect, that is, the control module may control the conveyance motor to decrease the operation speed such that the print line speed of the image forming apparatus 100 is lower than the print line speed of a printing plain sheet (i.e., the preset speed), and after the speed is slowed, there is a problem that the sheet curl is not easily generated when the sheet tail end drops down when the sheet is discharged by the paper discharge roller 114, causing the sheet tail end to fall into the paper discharge tray 115 normally, the sheet poor in the sheet regularity occurs, in addition, if under a high-temperature and high-humidity environment, no matter whether the sheet moisture content of any sheet on the fixing roller 112 is large, the slow print mode, the sheet becomes bent after passing through the fixing roller 112, and the sheet is easily bent by the fixing roller 112, and the paper jam is easily generated when the sheet is discharged by the paper jam, and the paper jam is simply caused after the paper is large; the sheet position may be obtained by the sheet path sensors 120G-H, although other sheet path sensors may be provided on the sheet path.

S120: the timing of acceleration of the conveyance motor for conveying the sheet from the paper path to the sheet discharge tray 115 and the timing of recovery of the conveyance motor are controlled in accordance with the sheet position.

In the present embodiment, since the image forming apparatus 100 is designed to have a large paper pitch when printing sheets of a small size, a special paper type (not limited to thick paper, envelopes, label paper, film, card, etc.), a specific print mode (not limited to slow print mode such as mute mode, high resolution print mode, etc.), i.e., the next sheet is just at the fixing roller 112 or not yet at the fixing roller 112 after the discharge roller 114 discharges the previous sheet, the control module can control the print linear velocity to a reduced print linear velocity (i.e., the print linear velocity in the slow print mode) by controlling the conveyance motor during the entire process of the sheet passing through the fixing roller 112 so that the sheet always maintains the slow print mode during the process of fixing an image by the fixing roller 112, ensuring the image fixing effect; and the control module can increase the printing linear speed by controlling the conveying motor when the sheet is discharged by the paper discharge roller 114, thereby ensuring that various types of sheets can be smoothly discharged from the paper discharge roller 114, ensuring the sheet material volume and the uniformity of the sheet in the paper discharge tray 115, avoiding the problem of paper jam in the high-temperature and high-humidity environment, and simultaneously, after the former sheet is rapidly discharged by the paper discharge roller 114, the control module can restore the printing linear speed (namely the printing linear speed in the slow printing mode) by controlling the conveying motor, so as to prepare for printing the later sheet and promote the small-size continuous printing efficiency. When the fixing roller 112 is driven by an independent conveying motor and the discharge roller 114 is also driven by an independent conveying motor, the control module controls the rotation speed of the conveying motor driving the fixing roller 112 to correspond to the reduced printing line speed during the whole process of the sheet passing through the fixing roller 112, and controls the rotation speed of the conveying motor driving the discharge roller 114 to correspond to the increased printing line speed when the sheet is discharged by the discharge roller 114.

In the present embodiment, as shown in fig. 3, the control of the timing of the acceleration of the conveyance motor and the timing of the recovery of the conveyance motor includes:

s121: the position of the sheet with respect to the discharge roller 114, or the position of the sheet with respect to the fixing roller 112 and the discharge roller 114 is acquired according to the sheet position.

In the present embodiment, acquiring the position of the sheet with respect to the discharge roller 114 or the position of the sheet with respect to the fixing roller 112 and the discharge roller 114 according to the sheet position includes:

the position of the sheet with respect to the discharge roller 114, or the position of the sheet with respect to the fixing roller 112 and the discharge roller 114 is determined by one or more of timing of paper feeding on the paper path, detection of the position of the sheet, issue of print data, relative position of paper path sensor, actual mechanical distance of the sheet with respect to the fixing roller 112 and the discharge roller 114, and length of the sheet.

For the paper feeding timing on the paper path, it may be that an inlet of the paper path into which the leading end or trailing end of the sheet is fed by the pickup roller 109 is detected by a paper path sensor provided at the pickup roller 109, and the actual mechanical distance of the inlet of the paper path sensor or paper path from the fixing roller 112 and the discharge roller 114 is determined at the time of manufacturing the image forming apparatus 100, and when the sensor detects that the leading end of the sheet enters the inlet of the paper path, the control module may calculate the actual mechanical distance of the trailing end of the sheet from the fixing roller 112 and the discharge roller 114 (i.e., the position of the sheet from the fixing roller 112 and the discharge roller 114) based on the actual mechanical distance of the inlet of the paper path sensor or paper path from the fixing roller 112 and the discharge roller 114 and the length of the sheet; similarly, when the sensor detects that the trailing end of the sheet enters the entrance of the paper path, the control module may confirm that the actual mechanical distance of the trailing end of the sheet with respect to the fixing roller 112 and the discharge roller 114 is the actual mechanical distance of the paper path sensor or the entrance of the paper path from the fixing roller 112 and the discharge roller 114.

For detection of the sheet position, it is possible to detect when the leading end or trailing end of the sheet passes the position of the paper path sensor by the paper path sensor provided at an arbitrary position in the paper path, and the actual mechanical distance of the paper path sensor from the fixing roller 112 and the discharge roller 114 is determined when the image forming apparatus 100 is manufactured, and when the sensor detects that the leading end of the sheet passes the position, the control module may calculate the actual mechanical distance of the trailing end of the sheet from the fixing roller 112 and the discharge roller 114 (i.e., the position of the sheet from the fixing roller 112 and the discharge roller 114) based on the actual mechanical distance of the paper path sensor from the fixing roller 112 and the discharge roller 114 and the length of the sheet; similarly, when the sensor detects that the trailing end of the sheet passes the position, the control module may confirm that the actual mechanical distance between the trailing end of the sheet and the fixing roller 112 and the discharge roller 114 is the actual mechanical distance between the paper path sensor and the fixing roller 112 and the discharge roller 114, and it should be noted that, when the paper path sensor is located behind the fixing roller 112, the control module does not need to calculate the actual mechanical distance between the paper path sensor and the fixing roller 112.

For the print data distribution, it may be that when the control module starts to emit the light beam by controlling the laser scanning unit 111, since the actual mechanical distance between the photosensitive drum receiving the light beam in the photosensitive drums 101Y to K and the fixing roller 112 and the discharge roller 114 has been determined at the time of manufacturing the image forming apparatus 100, the control module may calculate the actual mechanical distance between the sheet trailing end and the fixing roller 112 and the discharge roller 114 from the actual mechanical distance between the image start position on the sheet, which is calculated from the sheet length and the print format set by the image forming apparatus 100 (the distance between the start position of the image printed on the sheet and the leading end of the sheet), from the actual mechanical distance between the photosensitive drum receiving the light beam and the fixing roller 112 and the discharge roller 114 and the distance between the image start position on the sheet and the sheet trailing end.

As for the relative position of the paper path sensors, it may be that the actual mechanical distance of the sheet trailing end with respect to the fixing roller 112 and the discharge roller 114 (i.e., the position of the sheet with respect to the fixing roller 112 and the discharge roller 114) is calculated by the control module from the actual mechanical distance of the paper path sensor provided before the fixing roller 112 with respect to the other two paper path sensors and the sheet length when the paper path sensor provided before the fixing roller 112 detects that the leading end of the sheet passes the position, which are determined when the image forming apparatus 100 is manufactured by the paper path sensors provided before the fixing roller 112 and the paper path sensors provided at the fixing roller 112 and the discharge roller 114; similarly, when the sensor detects that the trailing end of the sheet passes through the position, the control module may confirm that the actual mechanical distance of the trailing end of the sheet with respect to the fixing roller 112 and the discharge roller 114 is the actual mechanical distance between the paper path sensor disposed in front of the fixing roller 112 and the other two paper path sensors; further, by providing a paper path sensor in front of the fixing roller 112 and a paper path sensor between the fixing roller 112 and the discharge roller 114, and the actual mechanical distance between the fixing roller 112 and the discharge roller 114 being determined at the time of manufacturing the image forming apparatus 100, the control module may confirm that the actual mechanical distance between the trailing end of the sheet and the fixing roller 112 and the discharge roller 114 is the actual mechanical distance between the two paper path sensors and the actual mechanical distance between the fixing roller 112 and the discharge roller 114, respectively. When the paper path sensor is located after the fixing roller 112 and the paper path sensor detects the sheet, the control module does not calculate the actual mechanical distance between the sheet and the fixing roller 112, and the control module may calculate the actual mechanical distance between the sheet and the paper discharge roller 114.

S122: the timing of acceleration of the conveyance motor and the timing of recovery of the conveyance motor are controlled according to the position of the sheet with respect to the discharge roller 114, or the positions of the sheet with respect to the fixing roller 112 and the discharge roller 114.

In the implementation method, since the control module calculates the actual mechanical distance between the tail end of the sheet and the fixing roller 112 and the paper discharge roller 114, the control module can calculate the time required from the position of the sheet to the completion of image fixing according to the printing linear speed of the tail end of the sheet in the fixing roller 112 and the slow printing mode, and then the control module controls the printing linear speed to be the reduced printing linear speed by controlling the conveying motor in the time to ensure the image fixing quality, and controls the conveying motor to accelerate to increase the printing linear speed after delaying the time; the control module can calculate the time required from the increase of the printing linear velocity to the discharge of the sheet according to the actual mechanical distance between the tail end of the sheet and the discharge roller 114 and the increased printing linear velocity, and after the time is maintained, the control module can control the conveying motor to restore the printing linear velocity to the original printing linear velocity when the printing linear velocity is printed at a low speed so as to fix the image of the next sheet; it should be noted that, when the paper path sensor is located behind the fixing roller 112 and the paper path sensor detects the sheet, the control module does not calculate the actual mechanical distance between the sheet and the fixing roller 112, but when the paper path sensor detects that the tail end of the sheet passes through the paper path sensor, the control module controls the conveying motor to accelerate and increase the printing linear velocity, then the control module can calculate the time required from the increase of the printing linear velocity to the discharge of the sheet according to the actual mechanical distance between the tail end of the sheet and the discharge roller 114 and the increased printing linear velocity, and after the time is maintained, the control module returns the printing linear velocity to the original printing linear velocity when the printing linear velocity is printed at a low speed by controlling the conveying motor.

The following are examples of several implementation scenarios in which the timing of acceleration of the conveyance motor and the timing of recovery of the conveyance motor are controlled according to the positions of the sheet relative to the fixing roller 112 and the discharge roller 114:

scene one:

as shown in fig. 1, when the image forming apparatus 100 prints at a slow speed V1, the control module controls the conveyance motor to accelerate the printing line speed to V2 when detecting that the trailing end of the sheet on the paper path passes by the paper path sensor 120G, calculates the time t1 based on the actual mechanical distance S2 between the paper path sensor 120G and the paper discharge roller 114, the speed V2, and the safety margin time t2, and resumes printing the small paper type printing line speed VI by controlling the conveyance motor after the delay time t1, and the trailing end curl amount of the sheet becomes smaller after the speed of the paper discharge roller 114 increases, and the sheet is more likely to drop to the paper discharge tray 115 by the speed inertia of the sheet leaving, wherein t1=s2/v2+t2 (safety margin), that is, a certain time= (distance from the paper path sensor 120G to the paper discharge roller 114)/the speed after the acceleration+the safety margin time (a fixed value may be set), or a safety margin time, that is, t1=s2/V2 may be omitted.

Scene II:

as shown in fig. 1, when the image forming apparatus 100 prints at a slow speed V1, the control module calculates a time t3, t3= (l1+s3)/V1 based on the sheet length L1, the distance S3 between the sheet sensor 120H and the sheet sensor 120G, and the speed V1, and when the sheet sensor 120H detects that the leading end of the sheet on the sheet passes through the sheet, the control module accelerates the printing linear speed to V2 by controlling the conveying motor after the delay time t3, and after the speed is accelerated, the trailing end curl amount of the sheet becomes smaller, and the sheet is more likely to fall to the sheet discharge tray by the speed inertia of the sheet leaving, and calculates a time t1 based on the distance S2 between the sheet sensor 120G and the sheet discharge roller 114, the speed V2, and the safety margin time, and the control module resumes printing the small printing linear speed VI by controlling the conveying motor after the delay time t1, t1=s2/v2+t2 (safety margin time), although the safety margin time may not be added.

It should be noted that embodiments similar to the sheet and the paper sensor may be listed according to different sheets, trigger positions, and the like.

When the paper discharge roller 114 uses one paper discharge motor alone, that is, the conveying motor is used to drive the fixing roller 112 and other rollers other than the paper discharge roller 114, the control module may control the speed of the conveying motor to be always maintained at V1, and the control module may control the speed of the paper discharge motor to be always maintained at V2, or the control module may calculate the time required after the sheet is discharged according to the actual mechanical distance of the trailing end of the sheet with respect to the paper discharge roller 114 and the speed V2, and after the time is maintained, the control module returns the speed of the paper discharge motor to the original speed by controlling the paper discharge motor. In addition, when the fixing roller 112 also uses one fixing motor alone, the control module may control the fixing motor speed to be kept at V1 all the time, or the control module may calculate the time when the fixing motor starts fixing and the time when the fixing is completed according to the actual mechanical distance of the trailing end of the sheet to the fixing roller 112, the length of the sheet, the rotational speed of the conveying motor, and the rotational speed of the fixing motor, and the control module may control the speed of the fixing motor to be V1 during the time from the time when the fixing starts to the time when the fixing is completed.

Fig. 4 schematically shows a sheet discharge control method according to another embodiment of the present invention, which can be used to control an image forming apparatus. As shown in fig. 4, the sheet discharging method includes the steps of:

s210: when the printing linear velocity is lower than the preset velocity, the image position is acquired.

In the present embodiment, the sheet discharge control method is controlled by the image position, and the control module calculates the position of the leading end of the image on the transfer belt 105 or the secondary transfer roller 106 or the sheet (i.e., the actual mechanical distance of the leading end of the image from the photosensitive drum) based on the time taken from the start of emission of a certain light beam to the start of emission of a light beam from any one photosensitive drum and the printing line speed by the controlled laser scanning unit 111, then subtracts the length of the image to obtain the actual mechanical distance of the trailing end of the image from the photosensitive drum, and the length of the image can be calculated by the time taken from the start of emission of a light beam to the end of emission of a light beam and the printing line speed; the control module may also calculate the position of the trailing end of the image on the transfer belt 105 or the secondary transfer roller 106 or the sheet (i.e., the actual mechanical distance of the trailing end of the image from the photosensitive drum) based on the time elapsed from the end of the emission of the light beam to the end of the emission of the light beam by the controlled laser scanning unit 111 and the printing line speed, and the image position may also be acquired by a paper path sensor (i.e., an image sensor) provided on the paper path.

S220: the timing of acceleration of the conveying motor and the timing of recovery of the conveying motor are controlled based on the image position.

In the present embodiment, as shown in fig. 5, the control of the timing of acceleration of the conveyance motor and the timing of recovery of the conveyance motor includes:

s221: acquiring the position of the image position relative to the discharge roller 114 or the position of the image position relative to the fixing roller 112 and the discharge roller 114 based on the image position;

in the present embodiment, since the actual mechanical distance between the photosensitive drum 101Y-K and the fixing roller 112 and the discharge roller 114 is determined at the time of manufacturing the image forming apparatus 100, the control module may obtain the actual mechanical distance between the image end and the fixing roller 112 and the discharge roller 114 from the actual mechanical distance between the photosensitive drum and the fixing roller 112 and the discharge roller 114 of any one of the photosensitive drums receiving the light beam minus the actual mechanical distance between the image end and the photosensitive drum calculated in the above step S210, or the control module may obtain the actual mechanical distance between the image end and the fixing roller 112 and the discharge roller 114 from the actual mechanical distance between the image end and the fixing roller 112 and the discharge roller 114 calculated from the leading end obtained by the paper sensor, and the actual mechanical distance between the image end and the fixing roller 112 and the discharge roller 114 calculated from the leading end obtained by the paper sensor may be the actual mechanical distance between the paper end and the fixing roller 112 and the discharge roller 114 added to the actual mechanical distance between the paper end and the fixing roller 112 and the discharge roller 114, when the paper sensor obtains the image position is determined at the time of manufacturing the image forming apparatus 100. When the image position is located between the fixing roller 112 and the discharge roller 114, the position of the image position with respect to the fixing roller 112 is not required to be obtained, and the position of the image position with respect to the discharge roller 114 is only required to be obtained.

S222: the timing of acceleration of the conveying motor and the timing of recovery of the conveying motor are controlled based on the position of the image with respect to the discharge roller 114 or the positions of the image with respect to the fixing roller 112 and the discharge roller 114.

In the implementation method, as the control module calculates the actual mechanical distance between the tail end of the image and the fixing roller 112 and the paper discharge roller 114, the control module can calculate the time required from the position of the image to the completion of fixing the image according to the actual mechanical distance between the tail end of the image and the fixing roller 112, and the control module controls the printing linear speed to be the reduced printing linear speed by controlling the conveying motor in the time to ensure the fixing quality of the image, and controls the conveying motor to accelerate to increase the printing linear speed after delaying the time; the control module calculates the time required for the sheet discharge from the sheet end to the increase in the printing linear velocity based on the actual mechanical distance of the image end from the sheet end to the discharge roller 114, the distance of the image end from the sheet end calculated by the printing format (sheet length minus the distance of the start position of the image printed on the sheet from the leading end of the sheet and the length of the image) set by the image forming apparatus 100, and the time required for the sheet discharge based on the sheet sensor 120G, that is, the time required for the sheet discharge to be delayed by the time before the step of accelerating the increase in the printing linear velocity by controlling the transfer motor, and when the sheet end is detected by the sheet sensor 120G, the control module calculates the time required for the sheet discharge from the actual mechanical distance of the sheet end from the discharge roller 114 and the increased printing linear velocity based on the time required for the sheet discharge to be controlled by controlling the transfer motor to be accelerated.

The following will be described as an implementation scenario in which the timing of acceleration of the conveyance motor is controlled according to the position of the image with respect to the fixing roller 112 and the discharge roller 114:

as shown in fig. 1, the positions of the photosensitive drums 101Y-K corresponding to the different color image formation, the actual mechanical distance of the points of the corresponding light beams on the photosensitive drums 101Y-K with respect to the fixing roller 112, the paper path sensor 120G, and the actual mechanical distance of the paper path sensor 120G with respect to the discharge roller 114 are already determined at the time of manufacturing the image forming apparatus 100. When the image forming apparatus 100 prints at a slow speed V1, for example, when the image is sent out, taking the photosensitive drum 102Y corresponding to the yellow image as an example (which may be calculated on other photosensitive drums), the actual mechanical distance between the point corresponding to the light beam on the photosensitive drum 102Y and the fixing roller 112 is S4, the control module calculates t4, t4= (S4)/V1 according to the distance S4 and the speed V1, after the delay time t4, the control module accelerates the printing linear speed to V2 by controlling the conveying motor, after the speed is accelerated, the tail end curl amount of the sheet becomes smaller, and meanwhile, the sheet is easier to fall to the paper discharge tray by the speed inertia of the leaving sheet, after that, the control module calculates t1 according to the distance S2 between the paper sensor 120G and the paper discharge roller, the speed V2 and the safety margin time, when the paper sensor 120G detects the tail end of the sheet, the control module delays the speed VI, after the time t1, by controlling the conveying motor, t1=s2/v2+t2 (safety margin) is restored, and the safety margin time may be omitted.

As shown in fig. 1, an embodiment of the present invention further provides an image forming apparatus 100, the image forming apparatus 100 including:

the paper path sensor 120G-H, the paper path sensor 120G-H is configured to acquire a sheet position and/or acquire an image position when the printing line speed is lower than a preset speed;

a conveying motor for conveying the sheet from the paper path to the sheet discharge tray 115;

The control module for controlling the timing of acceleration of the conveying motor and the timing of recovery of the conveying motor according to the sheet position and/or the image position comprises:

the control module acquires the position of the sheet and/or image position relative to the discharge roller 114 or the position of the sheet and/or image position relative to the fixing roller 112 and the discharge roller 114 based on the sheet position and/or image position;

the control module controls timing of acceleration of the conveyance motor and timing of recovery of the conveyance motor based on the position of the acquired sheet and/or image position relative to the discharge roller 114, or the position of the sheet and/or image position relative to the fixing roller 112 and the discharge roller 114.

Note that a conveyance motor may be used to drive the fixing roller 112, and furthermore, the fixing roller 112 may be driven by a separate conveyance motor (fixing motor).

The image forming apparatus 100 may acquire (calculate) the image position by the control module when the printing line speed is lower than the preset speed.

The specific control process of the image forming apparatus 100 has been described in detail in the sheet discharge control method, and thus will not be described in detail.

It should be noted that all sensors and other control signals on the paper including but not limited to images can trigger and control the acceleration and deceleration of the conveyor motor to achieve the sheet discharge effect a As shown in fig. 1, for example, the positions indicated by the numbers in the drawing are paper path sensors 120G to H (sensor), the conveying roller 110, the discharge roller 114, and the image, and the timing of acceleration and recovery of the conveying motor can be controlled by the positions of the paper path sensors 120G to H or the image as long as the positional relationship between them with respect to the fixing roller 112 and the discharge roller 114 is known, and are not limited to the sheet head and tail, and any positions, the start and end of the image, and any positions.

The embodiment of the invention also provides a computer readable storage medium, which comprises a stored program, wherein the device where the computer readable storage medium is located is controlled to execute the sheet discharge control method when the program runs.

Any combination of one or more computer readable media may be utilized as the above-described computer readable storage media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (erasable programmable readonly memory, EPROM) or flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

The program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, radio Frequency (RF), etc., or any suitable combination of the foregoing.

What has been described above is merely some embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.

Claims

1. A sheet discharge control method, characterized by comprising:

and controlling the timing of acceleration of a conveying motor for conveying the sheet from the paper path to the paper discharge tray and the timing of recovery of the conveying motor based on the sheet position and/or the image position.

2. The sheet discharge control method according to claim 1, characterized in that the timing of controlling the acceleration of the conveyance motor and the timing of the recovery speed of the conveyance motor include:

acquiring the position of the sheet relative to the paper discharge roller or the position of the sheet relative to the fixing roller and the paper discharge roller according to the position of the sheet;

the timing of acceleration of the conveyance motor and the timing of recovery of the conveyance motor are controlled according to the position of the sheet relative to the discharge roller, or the position of the sheet relative to the fixing roller and the discharge roller.

3. The sheet discharge control method according to claim 2, wherein the acquiring of the position of the sheet with respect to the discharge roller or the position of the sheet with respect to the fixing roller and the discharge roller based on the sheet position includes:

the position of the sheet with respect to the discharge roller or the position of the sheet with respect to the fixing roller and the discharge roller is determined by one or more of timing of paper feeding on the paper path, detection of the position of the sheet, issue of print data, relative position of a paper path sensor, actual mechanical distance of the sheet with respect to the fixing roller and the discharge roller, and length of the sheet.

4. The sheet discharge control method according to claim 1, characterized in that the timing of controlling the acceleration of the conveyance motor and the timing of the recovery speed of the conveyance motor include:

acquiring a position of the image position relative to the discharge roller or a position of the image position relative to the fixing roller and the discharge roller based on the image position;

and controlling the timing of acceleration of the conveying motor and the timing of recovery of the conveying motor according to the position of the image position relative to the paper discharge roller or the position of the image position relative to the fixing roller and the paper discharge roller.

5. The sheet discharge control method according to any one of claims 1 to 4, wherein the conveying motor is further configured to drive a fixing roller.

6. An image forming apparatus, comprising:

and a control module for controlling timing of acceleration of the conveying motor and timing of recovery of the conveying motor according to the sheet position and/or the image position.

7. The image forming apparatus according to claim 6, comprising:

8. The image forming apparatus according to claim 6, comprising:

the control module controls timing of acceleration of the conveyance motor and timing of recovery of the conveyance motor based on a position of the image position acquired with respect to a discharge roller or a position of the image position with respect to the fixing roller and the discharge roller.

9. The image forming apparatus according to any one of claims 6 to 8, wherein the conveying motor is configured to drive the fixing roller.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored program, wherein the program, when run, controls an apparatus in which the computer-readable storage medium is located to execute the sheet discharge control method according to any one of claims 1 to 5.