Paper transfer control method and device

Abstract

The present invention relates to the field of computer technology, and particularly to a method and device for controlling paper conveyance. First, determine the first time when the paper feed roller conveys the currently conveyed paper from the corresponding paper feed point to the leading edge sensor, and then determine the first distance according to the first time and the first paper feed speed of the paper feed roller. Determine whether the second distance is equal to the first distance. If they are not equal, then determine the second paper feed speed according to the first distance and the standard conveyance time of the conveyed paper from the paper feed point to the leading edge sensor. When it is detected that the paper head of the currently conveyed paper reaches a preset rotation speed point, obtain the transfer speed of the transfer roller and control the paper feed roller to run at the transfer speed. By adjusting the paper feed speed of the paper feed roller, the time for the conveyed paper to reach the leading edge sensor from the paper feed point is made the same, and at the rotation speed point, the paper feed roller is adjusted to run at the transfer speed, so that the conveyed paper and the image reach the transfer roller simultaneously, ensuring the normal execution of the operation task.

Description

Technical Field

[0001] The present invention relates to the field of computer technology, and particularly to a method and device for controlling paper transmission. Background Art

[0002] When an image forming device executes a job task, the devices that the paper passes through in sequence may include: a paper feed roller, a leading edge sensor, a registration roller, and a transfer roller. The paper feed roller is used for paper transmission. The leading edge sensor is located at the front end of the registration roller, and its function is to sense the entry of the paper. The registration roller is used to straighten the paper and make the image coincide with the paper at the transfer roller.

[0003] The height of the paper in the paper cassette will decrease as the paper is reduced. Therefore, the time for the paper to reach the registration roller from the paper feed point (the contact point between the paper feed roller and the paper) will increase as the number of papers decreases. After the registration roller is turned on, the paper feed roller can calculate whether the paper has left the paper feed roller based on the linear speed and time of the registration roller. If the paper has left the paper feed roller, the paper feed roller will immediately stop rotating. This can ensure that there is a gap between the papers during printing and prevent paper jams at the paper feeding location. However, considering cost issues, some image forming devices do not have a registration roller. Once the paper feeding starts, there is no pause in the middle, and it is impossible to infer when the paper leaves the paper feed roller based on the rotation time of the registration roller, making it difficult to control paper transmission. Summary of the Invention

[0004] Embodiments of the present invention provide a method and device for controlling paper transmission. By adjusting the paper feeding speed of the paper feed roller, the time for the transmitted paper to reach the leading edge sensor from the paper feed point is made the same, and at a rotational speed point, the paper feed roller is adjusted to run at the transfer speed, so that the transmitted paper and the image reach the transfer roller simultaneously, ensuring the normal execution of the job task.

[0005] In a first aspect, embodiments of the present invention provide a method for controlling paper transmission, including:

[0006] Determining a first time for the paper feed roller to transmit the current transmitted paper from the corresponding paper feed point to the leading edge sensor;

[0007] Determining a first distance according to the first time and the first paper feeding speed of the paper feed roller;

[0008] Judging whether a second distance is equal to the first distance, where the second distance is the distance between the previous transmitted paper from the corresponding paper feed point to the leading edge sensor;

[0009] If they are not equal, determining a second paper feeding speed according to the first distance and the standard transmission time for the transmitted paper from the paper feed point to the leading edge sensor, where the paper feed roller transmits the subsequent transmitted paper at the second paper feeding speed;

[0010] When it is detected that the leading edge of the currently conveyed paper reaches a preset rotational speed point, obtain the transfer speed of the transfer roller and control the paper feed roller to run at the transfer speed to continue conveying the currently conveyed paper, where the rotational speed point is located between the leading edge sensor and the transfer roller.

[0011] In one embodiment, the method further includes:

[0012] If the first distance and the second distance are equal, control the paper feed roller to convey the subsequent conveyed paper at the first paper feed speed.

[0013] In one embodiment, before determining the first time when the paper feed roller conveys the currently conveyed paper from the corresponding paper feed point to the leading edge sensor, the method further includes:

[0014] Control the paper feed roller to run at an initial paper feed speed, and determine the initial time required for the first conveyed paper to be conveyed from the corresponding paper feed point to the leading edge sensor;

[0015] Determine an initial distance according to the initial time and the initial paper feed speed, where the initial distance is the distance from the corresponding paper feed point of the first conveyed paper to the leading edge sensor;

[0016] If the initial time is not equal to the standard conveyance time, update the initial paper feed speed to the quotient of the initial distance and the standard conveyance time;

[0017] Control the paper feed roller to convey the first conveyed paper at the updated initial paper feed speed.

[0018] In one embodiment, the method further includes:

[0019] When it is detected that the leading edge of the currently conveyed paper reaches the transfer roller, control the paper feed roller to stop running;

[0020] Alternatively, start timing after it is detected that the leading edge of the currently conveyed paper reaches the transfer roller, and after a stop time, control the paper feed roller to stop running, where the stop time is less than or equal to the paper tail extraction time of the currently conveyed paper, and the paper tail extraction time is determined according to the first distance and the transfer speed.

[0021] In one embodiment, the method further includes:

[0022] Obtain a pre-stored third distance and a third time, where the third distance is the distance from the corresponding paper feed point of the conveyed paper in the full paper state to the leading edge sensor, and the third time is the time required for the paper tail of the conveyed paper to leave the paper feed point from when the paper head of the conveyed paper reaches the transfer roller in the full paper state;

[0023] Determine the distance difference between the third distance and the first distance, and determine the quotient of the distance difference and the transfer speed as the fourth time;

[0024] Determine the difference between the third time and the fourth time as the paper tail separation time.

[0025] In one embodiment, the rotation speed point is set at the tip sensor.

[0026] In a second aspect, an embodiment of the present invention provides a paper transmission control device, including:

[0027] A timing module, configured to determine the first time for the paper feed roller to transfer the current transferred paper from the corresponding paper feed point to the tip sensor;

[0028] A processing module, configured to determine the first distance according to the first time and the first paper feed speed of the paper feed roller;

[0029] A judgment module, configured to judge whether the second distance is equal to the first distance, where the second distance is the distance between the previous transferred paper from the corresponding paper feed point to the tip sensor;

[0030] The processing module is further configured to, if they are not equal, determine the second paper feed speed according to the first distance and the standard transfer time of the transferred paper in the full paper state, where the paper feed roller transfers the subsequent transferred paper at the second paper feed speed;

[0031] A control module, configured to, when detecting that the paper head of the current transferred paper reaches a preset rotation speed point, obtain the transfer speed of the transfer roller and control the paper feed roller to run at the transfer speed, where the rotation speed point is located between the tip sensor and the transfer roller.

[0032] In one embodiment, the control module is further configured to, if the first distance is equal to the second distance, control the paper feed roller to transfer the subsequent transferred paper at the first paper feed speed.

[0033] In one embodiment, before determining the first time for the paper feed roller to transfer the current transferred paper from the corresponding paper feed point to the tip sensor,

[0034] The control module is further configured to control the paper feed roller to run at an initial paper feed speed;

[0035] The timing module is further configured to determine the initial time required for the first transferred paper to be transferred from the corresponding paper feed point to the tip sensor;

[0036] The processing module is further configured to determine an initial distance according to the initial time and the initial paper feeding speed, where the initial distance is the distance from the corresponding paper feeding point of the first conveyed paper to the leading edge sensor;

[0037] The processing module is further configured to update the initial paper feeding speed to the quotient of the initial distance and the standard conveying time if the initial time is not equal to the standard conveying time;

[0038] The control module is further configured to control the paper feeding roller to convey the first conveyed paper at the updated initial paper feeding speed.

[0039] In one embodiment, the control module is further configured to control the paper feeding roller to stop running when it detects that the leading edge of the currently conveyed paper reaches the transfer roller; or, start timing after detecting that the leading edge of the currently conveyed paper reaches the transfer roller, and after a stop time, control the paper feeding roller to stop running, where the stop time is less than or equal to the paper tail extraction time of the currently conveyed paper, and the paper tail extraction time is determined according to the first distance and the transfer speed.

[0040] In one embodiment, the processing module is further configured to obtain a pre-stored third distance and a third time, where the third distance is the distance from the corresponding paper feeding point of the conveyed paper in the full paper state to the leading edge sensor, and the third time is the time required for the paper tail of the conveyed paper to leave the paper feeding point after the leading edge of the conveyed paper reaches the transfer roller in the full paper state; determine the distance difference between the third distance and the first distance, and determine the quotient of the distance difference and the transfer speed as the fourth time; determine the difference between the third time and the fourth time as the paper tail extraction time.

[0041] In one embodiment, the rotation speed point is set at the leading edge sensor.

[0042] In a third aspect, an embodiment of the present invention provides an electronic chip, including:

[0043] At least one processor; and

[0044] At least one memory communicatively connected to the processor, where:

[0045] The memory stores program instructions, and the processor can execute the method provided in the first aspect by calling the program instructions.

[0046] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a stored program, and when the program is executed by a processor, the method provided in the first aspect is implemented.

[0047] In an embodiment of the present invention, first determine the first time when the paper feed roller conveys the current conveyed paper from the corresponding paper feed point to the leading edge sensor, then determine the first distance according to the first time and the first paper feed speed of the paper feed roller, and judge whether the second distance is equal to the first distance. If not, determine the second paper feed speed according to the first distance and the standard conveyance time of the conveyed paper from the paper feed point to the leading edge sensor. When it is detected that the leading edge of the current conveyed paper reaches a preset rotational speed point, obtain the transfer speed of the transfer roller and control the paper feed roller to operate at the transfer speed. By adjusting the paper feed speed of the paper feed roller, the time for the conveyed paper from the paper feed point to the leading edge sensor is made the same, and at the rotational speed point, the paper feed roller is adjusted to operate at the transfer speed, so that the conveyed paper and the image reach the transfer roller simultaneously, ensuring the normal execution of the operation task. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 It is a flowchart of a paper conveyance control method provided by an embodiment of the present invention;

[0050] Figure 2 It is a flowchart of another paper conveyance control method provided by an embodiment of the present invention;

[0051] Figure 3 It is a schematic structural diagram of a paper conveyance control device provided by an embodiment of the present invention;

[0052] Figure 4 It is a flowchart of another paper conveyance control method provided by an embodiment of the present invention;

[0053] Figure 5 It is a flowchart of another paper conveyance control method provided by an embodiment of the present invention;

[0054] Figure 6 It is a flowchart of another paper conveyance control method provided by an embodiment of the present invention;

[0055] Figure 7 It is a flowchart of another paper conveyance control method provided by an embodiment of the present invention;

[0056] Figure 8 It is a schematic structural diagram of another paper conveyance control device provided by an embodiment of the present invention;

[0057] Figure 9A schematic structural diagram of an electronic device provided by an embodiment of the present invention. Detailed implementation manners

[0058] To better understand the technical solutions of this specification, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0059] It should be clear that the described embodiments are only a part of the embodiments of this specification, rather than all the embodiments. Based on the embodiments in this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by this specification.

[0060] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit this specification. The singular forms "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0061] In most image forming devices (such as printers, copiers, etc.) on the market currently, the entire paper feeding process is to convey the paper from the paper feed roller to the leading edge sensor and then stop at the registration roller. After a period of time, the registration roller starts to rotate, and the conveyed paper starts to move towards the transfer roller. The function of the registration roller is to align the conveyed paper and make the image coincide with the conveyed paper at the transfer roller. After the registration roller is started, the paper feed roller can calculate whether the paper has left the paper feed roller based on the linear speed and time of the registration roller. If the paper has left the paper feed roller, the paper feed roller will immediately stop rotating. This can ensure the paper spacing during printing and prevent paper jams at the paper feeding position. However, in existing devices without a registration roller, once the paper starts to be fed, there is no pause in the middle, and it is impossible to infer when the paper leaves the paper feed roller, making it difficult to control the paper conveyance.

[0062] In view of the above problems, an embodiment of the present invention provides a paper conveyance control method, which adjusts the paper feeding speed of the paper feed roller so that the time for the conveyed paper to reach the leading edge sensor from the paper feeding point is the same, and adjusts the paper feed roller to run at the transfer speed at the rotation speed point, so that the conveyed paper and the image reach the transfer roller simultaneously, ensuring the normal execution of the operation task.

[0063] Figure 1 A flowchart of a paper conveyance control method provided by an embodiment of the present invention. This method can be applied to an image forming device, which includes but is not limited to a printer, a copier, a fax machine, a scanner, and a multifunctional all-in-one machine integrating functions such as printing, copying, faxing, and scanning. Its function is to print an image or text on an imaging medium. As Figure 1 shown, this method may include:

[0064] Step 101: Determine the first time when the paper feed roller conveys the current sheet of paper from the corresponding paper feed point to the leading edge sensor.

[0065] Since the number of sheets of paper in the paper cassette decreases as the operation task is executed, relatively, the paper height also decreases, and thus the paper feed point will change. And the first time is the time required for the current sheet of paper to be conveyed from the corresponding paper feed point to the leading edge sensor. Therefore, the first time for each conveyed sheet of paper may be different. The image forming apparatus can determine the start point of the first time when the paper feed roller is running, and determine the end point of the first time when the leading edge sensor senses the leading edge of the conveyed sheet of paper, and then determine the value of the first time.

[0066] Step 102: Determine the first distance according to the first time and the first paper feed speed of the paper feed roller.

[0067] The first paper feed speed of the paper feed roller can be directly obtained, and the first distance is the product of the first time and the first paper feed speed.

[0068] Step 103: Determine whether the second distance is equal to the first distance, where the second distance is the distance between the corresponding paper feed point of the previous conveyed sheet of paper and the leading edge sensor.

[0069] Step 104: If they are not equal, then determine the second paper feed speed according to the first distance and the standard conveyance time of the conveyed sheet of paper from the paper feed point to the leading edge sensor, where the paper feed roller conveys the subsequent conveyed sheet of paper at the second paper feed speed.

[0070] The standard conveyance time in the embodiment of the present invention is a fixed time set in advance, which can be flexibly set according to the actual situation. For example, the standard conveyance time can be set as the time required for the first conveyed sheet of paper to be conveyed from the paper feed point to the leading edge conveyor in the full paper state in the paper cassette. The image forming apparatus determines the quotient of the first distance and the standard conveyance time as the second paper feed speed.

[0071] Since the distances between two adjacent sheets of paper from the paper feed point to the leading edge sensor are very close, therefore, the first distance of the current conveyed sheet of paper can be approximately determined as the actual distance between the subsequent conveyed sheet of paper and the leading edge sensor from the paper feed point. Dividing the first distance by the standard conveyance time to obtain the second paper feed speed and controlling the paper feed roller to convey the subsequent conveyed sheet of paper at the second paper feed speed can enable the time required for the subsequent conveyed sheet of paper to be conveyed from the paper feed point to the leading edge sensor to be the standard conveyance time. During the conveyance process of each conveyed sheet of paper, performing the above steps can make the time required for each conveyed sheet of paper to be conveyed from the corresponding paper feed point to the leading edge sensor be the standard conveyance time.

[0072] Step 105: When it is detected that the leading edge of the currently transported paper reaches a preset rotational speed point, obtain the transfer speed of the transfer roller and control the paper feed roller to run at the transfer speed to continue transporting the currently transported paper, where the rotational speed point is located between the leading edge sensor and the transfer roller.

[0073] When the transported paper passes through the leading edge sensor and reaches the rotational speed point, the image forming apparatus adjusts the running speed of the paper feed roller to be the same as that of the transfer roller, so that the currently transported paper coincides with the image at the transfer roller, ensuring the normal execution of the operation task.

[0074] Figure 2 It is a flowchart of another paper transport control method provided by an embodiment of the present invention. As Figure 2 shown, the method may include:

[0075] Step 201: Feed the paper at a first paper feed speed and start timing.

[0076] The image forming apparatus controls the paper feed roller to run at the first paper feed speed and starts timing when the currently transported paper starts to be transported.

[0077] Step 202: Determine whether the leading edge of the currently transported paper reaches the leading edge sensor.

[0078] The image forming apparatus can detect whether there is a transported paper passing through by the leading edge sensor. If the leading edge is detected, proceed to step 203; otherwise, continue to execute step 201.

[0079] Step 203: Determine the first time.

[0080] After the image forming apparatus detects that the leading edge of the currently transported paper reaches the leading edge sensor, determine the first time from the corresponding paper feed point of the currently transported paper to the leading edge sensor.

[0081] Step 204: Determine the first distance.

[0082] The first distance is the product of the first paper feed speed and the first time.

[0083] Step 205: Determine whether the first distance is equal to the second distance.

[0084] The second distance is the distance from the corresponding paper feed point of the previous transported paper to the leading edge sensor. If they are equal, proceed to step 207; otherwise, proceed to step 206.

[0085] Step 206: Determine the second paper feed speed.

[0086] The image forming apparatus obtains the standard transport time and determines the quotient of the first distance and the standard transport time as the second paper feed speed. When the subsequent transported paper is transported, feed the paper at the second paper feed speed.

[0087] Step 207: Determine whether the leading edge of the currently fed paper reaches the speed point.

[0088] If yes, proceed to Step 208; otherwise, continue the detection.

[0089] Step 208: Control the paper feed roller to run at the transfer speed.

[0090] Step 209: Determine whether the leading edge of the currently fed paper reaches the transfer roller.

[0091] If yes, end the current process; otherwise, return to Step 208.

[0092] Figure 3 The figure is a schematic structural diagram of a paper control device provided by an embodiment of the present invention. As Figure 3 shown, the device may include: a paper feed roller 310, a leading edge sensor 320, and a transfer roller 330. Point E is the transfer point, point M is the paper feed point, points P and Q correspond to each other, and the distance between points EP is equal to the distance between points EQ. When the image forming device executes a job task, when the leading edge of the fed paper reaches point P, the front end of the image reaches point Q, and the fed paper and the image reach point E at the same speed. To meet the above conditions, the time required for each fed paper to be transferred from point M (the corresponding paper feed point) to point E (the transfer point) needs to be the same. Through the above Steps 101 to 104, the image forming device can ensure that the time for each fed paper to reach the leading edge sensor from point M is the same. The running speed of the paper feed roller and the transfer speed of the transfer roller are not necessarily the same. The image forming device needs to set a speed point between the leading edge sensor and point P. When passing through the speed point, the speed of the paper feed roller is adjusted to be the same as that of the transfer roller. Since the speed of each fed paper passing through the leading edge sensor is different, in order to ensure that the transfer time of different fed papers between the leading edge sensor and point P does not have too large a difference, the speed point should be set at a position close to the leading edge sensor. Alternatively, the speed point can be directly set at the leading edge sensor, so that the speed of the paper feed roller is adjusted to be the same as that of the transfer roller immediately after the fed paper passes through the leading edge sensor, minimizing the error to the greatest extent. After the speed of the paper feed roller changes, the transfer time of each fed paper from the leading edge sensor to point E is very close, ensuring the normal execution of the job task.

[0093] In one embodiment, the time error caused by the speed change needs to be within the error control. For example, the error between the leading edge of the fed paper and the front end of the image is within 3 mm. If the known transfer speed is 118 mm / s, the time error T caused by the speed change shall not exceed 25 ms. During actual speed change, the image forming device can adjust the running speed of the paper feed roller from the second paper feed speed to the transfer speed through PID negative feedback regulation, and this process can be approximately regarded as a uniformly decelerated motion.

[0094] In one embodiment, the image forming apparatus further performs a process of initializing paper conveyance to determine the conveyance speed of the first conveyed sheet. The overall process is as shown in Figure 4 and may include:

[0095] Step 401: Control the paper feed roller to run at an initial paper feed speed, and determine the initial time required for the first conveyed sheet to be conveyed from the corresponding paper feed point to the leading edge sensor.

[0096] The image forming apparatus conveys the first conveyed sheet in the paper cassette from the paper cassette to the leading edge sensor.

[0097] Step 402: Determine the initial distance based on the initial time and the initial paper feed speed. The initial distance is the distance from the corresponding paper feed point of the first conveyed sheet to the leading edge sensor.

[0098] Step 403: If the initial time is not equal to the standard conveyance time, update the initial paper feed speed to the quotient of the initial distance and the standard conveyance time.

[0099] Step 404: Control the paper feed roller to run in reverse and convey the first conveyed sheet back to the paper cassette.

[0100] Through the above steps, the image forming apparatus can update the initial paper feed speed. When performing paper conveyance, control the paper feed roller to run at the initial paper feed speed. Since the initial paper feed speed is the quotient of the initial distance and the standard conveyance time, the first conveyed sheet can ensure that the time from the corresponding paper feed point to the leading edge sensor is the standard conveyance time.

[0101] The above process of initializing paper conveyance is not for executing a job task. Therefore, it is necessary to control the paper feed roller to run in reverse and convey the first conveyed sheet back to the paper cassette. The image forming apparatus can directly execute this process after power-on to determine and store the initial paper feed speed for use in subsequent job tasks. In addition, during the period from power-on of the image forming apparatus to the execution of a job task, the user may add paper to the paper cassette or take paper from the paper cassette, and the paper height will change. Therefore, the image forming apparatus can also execute the above process of initializing paper conveyance to update the initial paper feed speed after detecting that the paper cassette is pulled open or closed. Or, the image forming apparatus executes the above process before determining to execute a job task. The time point for executing the initialization of paper conveyance is not limited.

[0102] Figure 5 It is a flowchart of another paper conveyance control method provided by an embodiment of the present invention. As shown in Figure 2 and may include:

[0103] Step 501: Determine whether the device is powered on or the paper input tray is pulled.

[0104] Step 502: Feed the paper at the initial paper feeding speed and start timing.

[0105] Each time the image forming apparatus is powered on or a paper feed cassette pull operation is detected, the first transfer sheet in the current paper feed cassette is transferred.

[0106] Step 503: Determine whether the leading edge of the first transfer sheet reaches the leading edge sensor.

[0107] If yes, go to Step 504; otherwise, return to Step 502.

[0108] Step 504: Determine the initial time and the initial distance.

[0109] The initial time is the time it takes for the first transfer sheet to reach the leading edge sensor from the corresponding paper feeding point. The product of the initial time and the initial paper feeding speed is the initial distance.

[0110] Step 505: Determine whether the initial time is equal to the standard transfer time.

[0111] If yes, go to Step 507; otherwise, go to Step 506.

[0112] Step 506: Update the initial paper feeding speed.

[0113] Determine the updated initial paper feeding speed as the quotient of the initial distance and the standard transfer time.

[0114] Step 507: Feed the first transfer sheet back into the paper cassette.

[0115] In one embodiment, after the leading edge of the paper being conveyed reaches the transfer point, the trailing edge has not yet left the paper feed roller. If the trailing edge of the currently conveyed paper continues to move while the paper feed roller is still rotating after leaving the paper feed roller, it may continue to feed the next paper to be conveyed. Since the speed of the paper feed roller is greater than that of the transfer roller, the leading edge of the next paper to be conveyed may contact the trailing edge of the currently conveyed paper, resulting in paper jamming. To avoid the above problems, it is necessary to control the stop time point of the paper feed roller. The embodiments of the present invention provide two solutions: First, when it is detected that the leading edge of the currently conveyed paper reaches the transfer roller, control the paper feed roller to stop running. At this time, the transfer roller can carry the leading edge of the currently conveyed paper to move without the paper feeding driving force of the paper feed roller. Second, determine the trailing edge extraction time of the currently conveyed paper. Start timing when it is detected that the leading edge of the currently conveyed paper reaches the transfer roller, and after the trailing edge extraction time has elapsed, control the paper feed roller to stop running. By precisely controlling the leaving time of the trailing edge on the paper feed roller and stopping the rotation of the paper feed roller at the moment when the trailing edge leaves the paper feed roller, it can ensure that the paper coincides with the image under sufficient driving force. Further, in addition to the above two implementation manners, the image forming apparatus can also determine a stop time, where the stop time is less than or equal to the trailing edge extraction time. Start timing after the leading edge reaches the transfer roller, and control the paper feed roller to stop after the stop time has elapsed. It can be understood that the paper feed roller needs to stop running at the latest when the trailing edge of the currently conveyed paper leaves the paper feed roller, otherwise it may cause paper jamming. Therefore, the trailing edge extraction time is the critical point, and the paper feed roller can stop at any time point within 0 to the trailing edge extraction time without excessive limitation.

[0116] In one embodiment, the specific steps for the image forming apparatus to determine the trailing edge extraction time of the currently conveyed paper can be as Figure 6 shown and may include:

[0117] Step 601, obtain the pre-stored third distance and third time.

[0118] The third distance is the distance from the corresponding paper feed point of the paper being conveyed in the full paper state to the leading edge sensor, and the third time is the time required for the trailing edge of the paper being conveyed to leave the paper feed point from the moment the leading edge of the paper reaches the transfer point in the full paper state.

[0119] Step 602, determine the distance difference between the third distance and the first distance, and determine the quotient of the distance difference and the transfer speed as the fourth time.

[0120] Since the running speed of the paper feed roller has been converted to the transfer speed at this time, the fourth time can be obtained by dividing the distance difference by the transfer speed.

[0121] Step 603, determine the difference between the third time and the fourth time as the trailing edge extraction time.

[0122] It can be understood that the fewer the number of sheets in the tissue box, the lower the height of the sheets, the longer the distance from the self-sheet-feeding point to the transfer roller, and the shorter the distance from the sheet tail to the sheet-feeding point. Taking Figure 3 as an example, the length of the sheet is fixed. When the leading edge of the sheet reaches point E, the longer the distance between points M and E, the shorter the distance between the trailing edge of the sheet and M, and the shorter the trailing-edge extraction time. Therefore, the image forming apparatus can first calculate the trailing-edge extraction time in the full-sheet state, and then determine the reduction value of the distance traveled by the trailing edge of each sheet to be transferred based on the difference between the first distance and the third distance of each sheet to be transferred, and divide this value by the transfer speed to obtain the reduction value of the trailing-edge extraction time. Subtracting the reduction value of the trailing-edge extraction time from the trailing-edge extraction time in the full-sheet state can obtain the trailing-edge extraction time of the currently transferred sheet.

[0123] Figure 7 FIG. is a flowchart of another sheet transfer control method provided by an embodiment of the present invention. As Figure 7 shown, the method may include:

[0124] Step 701, controlling the sheet-feeding roller to run at the transfer speed.

[0125] Step 702, determining whether the leading edge of the currently transferred sheet has reached the transfer roller.

[0126] If so, proceed to step 703; otherwise, return to step 701.

[0127] Step 703, obtaining the first distance s1, the third distance s3, the third time t3, and the transfer speed v, and starting to time t1.

[0128] Step 704, determining the time difference according to the formula t4 = (s1 - s3) / v.

[0129] Step 705, determining the trailing-edge extraction time according to the formula t5 = t3 - t4.

[0130] Step 706, determining whether t1 is equal to t5.

[0131] If so, proceed to step 707; otherwise, continue to detect.

[0132] Step 707, controlling the sheet-feeding roller to stop running.

[0133] Optionally, in the embodiment of the present invention, the image forming apparatus controls the sheet-feeding roller to stop running after the trailing-edge extraction time. The image forming apparatus may also determine a stop time within 0 to the trailing-edge extraction time, and control the sheet-feeding roller to stop running after t1 = the stop time.

[0134] In an embodiment of the present invention, the image forming apparatus can determine the initial paper feeding speed through the paper feeding initialization process. During the execution of a job task, by continuously updating the paper feeding speed of the paper feeding roller, the transmission time of different conveyed papers from the paper feeding point to the leading edge sensor is made the same. Moreover, at a preset rotation speed point, the speed of the paper feeding roller is adjusted to be the same as that of the transfer roller, so that the transferred paper coincides with the image at the transfer point, ensuring the normal execution of the job task.

[0135] Figure 8 It is a schematic structural diagram of a paper feeding control device provided by an embodiment of the present invention. As Figure 8 shown, it may include: a timing module 810, a processing module 820, a judgment module 830, and a control module 840.

[0136] The timing module 810 is configured to determine a first time for the paper feeding roller to convey the current conveyed paper from the corresponding paper feeding point to the leading edge sensor.

[0137] The processing module 820 is configured to determine a first distance according to the first time and the first paper feeding speed of the paper feeding roller.

[0138] The judgment module 830 is configured to judge whether a second distance is equal to the first distance, where the second distance is the distance between the previous conveyed paper from the corresponding paper feeding point to the leading edge sensor.

[0139] The processing module 820 is configured to, if they are not equal, determine a second paper feeding speed according to the first distance and the standard transmission time of the conveyed paper in the full paper state, where the paper feeding roller conveys the subsequent conveyed paper at the second paper feeding speed.

[0140] The control module 840 is configured to, when detecting that the paper head of the current conveyed paper reaches a preset rotation speed point, obtain the transfer speed of the transfer roller and control the paper feeding roller to run at the transfer speed, where the rotation speed point is located between the leading edge sensor and the transfer roller.

[0141] In one embodiment, the control module 840 is further configured to, if the first distance and the second distance are equal, control the paper feeding roller to convey the subsequent conveyed paper at the first paper feeding speed.

[0142] In one embodiment, before determining the first time when the paper feed roller conveys the current conveyed paper from the corresponding paper feed point to the leading edge sensor, the control module 840 is further configured to control the paper feed roller to run at an initial paper feed speed; the timing module 810 is further configured to determine the initial time required for the first conveyed paper to be conveyed from the corresponding paper feed point to the leading edge sensor; the processing module 820 is further configured to determine an initial distance according to the initial time and the initial paper feed speed, where the initial distance is the distance from the corresponding paper feed point of the first conveyed paper to the leading edge sensor; the processing module 820 is further configured to update the initial paper feed speed to the quotient of the initial distance and the standard conveyance time if the initial time is not equal to the standard conveyance time; and control the paper feed roller to convey the first conveyed paper at the updated initial paper feed speed.

[0143] In one embodiment, the control module 840 is further configured to control the paper feed roller to stop running when detecting that the leading edge of the current conveyed paper reaches the transfer roller; or, start timing after detecting that the leading edge of the current conveyed paper reaches the transfer roller, and after a stop time, control the paper feed roller to stop running, where the stop time is less than or equal to the paper tail extraction time of the current conveyed paper, and the paper tail extraction time is determined according to the first distance and the transfer speed.

[0144] In one embodiment, the processing module 820 is further configured to obtain a pre-stored third distance and a third time, where the third distance is the distance from the corresponding paper feed point of the conveyed paper in the full paper state to the leading edge sensor, and the third time is the time required for the paper tail of the conveyed paper to leave the paper feed point from when the leading edge of the conveyed paper reaches the transfer roller in the full paper state; determine the distance difference between the third distance and the first distance, and determine the quotient of the distance difference and the transfer speed as the fourth time; and determine the difference between the third time and the fourth time as the paper tail extraction time.

[0145] In one embodiment, the rotation speed point can be set at the leading edge sensor.

[0146] Figure 9 It is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. Figure 9 The displayed electronic device is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present invention.

[0147] As Figure 9 shown, the electronic device is presented in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: one or more processors 910, a memory 930, and a communication bus 940 connecting different system components (including the memory 930 and the processor 910).

[0148] The communication bus 940 represents one or more of several types of bus architectures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of the various bus architectures. By way of example, these architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnection (PCI) bus.

[0149] An electronic device typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the electronic device, including volatile and nonvolatile media, removable and non-removable media.

[0150] The memory 930 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The electronic device may further include other removable / non-removable, volatile / nonvolatile computer system storage media. Although Figure 9 not shown, a disk drive for reading and writing to a removable nonvolatile magnetic disk (e.g., "floppy disk") and an optical disk drive for reading and writing to a removable nonvolatile optical disk (e.g., Compact Disc Read Only Memory (CD-ROM), Digital Video Disc Read Only Memory (DVD-ROM), or other optical media) may be provided. In these instances, each drive may be connected to the communication bus 940 via one or more data media interfaces. The memory 930 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the embodiments of the present invention.

[0151] A program / util utility having a set (at least one) of program modules can be stored in the memory 930. Such program modules include—but are not limited to—an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment. The program modules generally execute the functions and / or methods in the embodiments described in the present invention.

[0152] The electronic device can also communicate with one or more external devices, and can also communicate with one or more devices that enable a user to interact with the electronic device, or communicate with any device (such as a network card, a modem, etc.) that enables the electronic device to communicate with one or more other computing devices. Such communication can be carried out through the communication interface 920. And, the electronic device can also communicate with one or more networks (such as a Local Area Network (LAN), a Wide Area Network (WAN), and / or a public network, such as the Internet) through a network adapter ( Figure 9 not shown in the figure). The above network adapter can communicate with other modules of the electronic device through the communication bus 940. It should be understood that although Figure 9 not shown in the figure, other hardware and / or software modules can be used in combination with the electronic device, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, Redundant Arrays of Independent Drives (RAID) systems, tape drives, and data backup storage systems, etc.

[0153] The processor 910 executes various functional applications and data processing by running the programs stored in the memory 930, such as implementing the paper transfer control method provided by the embodiments of the present invention.

[0154] The embodiments of the present invention also provide a computer-readable storage medium. The above computer-readable storage medium stores computer instructions, and the above computer instructions cause the above computer to execute the paper transfer control method provided by the embodiments of the present invention.

[0155] The above computer-readable storage medium may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to, an electrical, 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 include: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (hereinafter referred to as: ROM), an erasable programmable read-only memory (hereinafter referred to as: EPROM) or a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0156] The computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries the computer-readable program code. Such a propagated data signal may take various forms, including - but not limited to - an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer-readable signal medium may also be any computer-readable medium other than the computer-readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0157] The program code contained on the computer-readable medium may be transmitted by any appropriate medium, including - but not limited to - wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0158] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0159] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0160] Any process or method description shown in a flowchart or described otherwise herein may be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logical function or process. The scope of the preferred embodiments of the present invention includes additional implementations, where functions may be executed in a substantially simultaneous manner or in an order opposite to that shown or discussed, according to the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0161] In several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other may be through some interfaces, and the indirect couplings or communication connections of devices or units may be in electrical, mechanical, or other forms.

[0162] In addition, each functional unit in various embodiments of the present invention may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit. The above-mentioned integrated units may be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0163] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for controlling paper conveyance, characterized in that, Including: Determine the first time for the paper feed roller to transfer the current conveyed paper from the corresponding paper feed point to the leading edge sensor; Determine the first distance according to the first time and the first paper feed speed of the paper feed roller; Judge whether the second distance is equal to the first distance, where the second distance is the distance between the previous conveyed paper from the corresponding paper feed point to the leading edge sensor; If not equal, determine the second paper feed speed according to the first distance and the standard transfer time of the conveyed paper from the paper feed point to the leading edge sensor, wherein the paper feed roller transfers the subsequent conveyed paper at the second paper feed speed; When it is detected that the leading edge of the current conveyed paper reaches a preset rotation speed point, obtain the transfer speed of the transfer roller and control the paper feed roller to run at the transfer speed to continue conveying the current conveyed paper, where the rotation speed point is located between the leading edge sensor and the transfer roller.

2. The method according to claim 1, characterized in that The method further includes: If the first distance and the second distance are equal, control the paper feed roller to transfer the subsequent conveyed paper at the first paper feed speed.

3. The method according to claim 1, wherein Before determining the first time for the paper feed roller to transfer the current conveyed paper from the corresponding paper feed point to the leading edge sensor, the method further includes: Control the paper feed roller to run at an initial paper feed speed, and determine the initial time required for the first conveyed paper to be transferred from the corresponding paper feed point to the leading edge sensor; Determine the initial distance according to the initial time and the initial paper feed speed, where the initial distance is the distance between the first conveyed paper from the corresponding paper feed point to the leading edge sensor; If the initial time is not equal to the standard transfer time, update the initial paper feed speed to the quotient of the initial distance and the standard transfer time; Control the paper feed roller to transfer the first conveyed paper at the updated initial paper feed speed.

4. The method according to claim 1, wherein The method further includes: When it is detected that the leading edge of the current conveyed paper reaches the transfer roller, control the paper feed roller to stop running; Or, start timing after it is detected that the leading edge of the current conveyed paper reaches the transfer roller, and after a stop time, control the paper feed roller to stop running, where the stop time is less than or equal to the paper tail extraction time of the current conveyed paper, and the paper tail extraction time is determined according to the first distance and the transfer speed.

5. The method according to claim 4, wherein The method further includes: Obtain a pre-stored third distance and a third time, where the third distance is the distance between the conveyed paper from the corresponding paper feed point to the leading edge sensor in a full paper state, and the third time is the time required for the paper tail of the conveyed paper to leave the paper feed point from the moment the leading edge of the conveyed paper reaches the transfer roller in a full paper state; Determine the distance difference between the third distance and the first distance, and determine the quotient of the distance difference and the transfer speed as the fourth time; Determine the difference between the third time and the fourth time as the paper tail extraction time.

6. The method according to claim 1, wherein The rotation speed point is set at the leading edge sensor.

7. A paper conveyance control device, characterized in that, The device for executing the method according to any one of claims 1 to 6 includes: A timing module for determining the first time for the paper feed roller to transfer the current conveyed paper from the corresponding paper feed point to the leading edge sensor; A processing module, configured to determine a first distance according to the first time and the first paper feeding speed of the paper feeding roller. A judging module, configured to judge whether a second distance is equal to the first distance, where the second distance is the distance from the corresponding paper feeding point of the previous conveyed paper to the leading edge sensor. The processing module is further configured to, if they are not equal, determine a second paper feeding speed according to the first distance and the standard conveying time of the conveyed paper in a full paper state, where the paper feeding roller conveys the subsequent conveyed paper at the second paper feeding speed. A control module, configured to, when detecting that the paper head of the currently conveyed paper reaches a preset rotation speed point, obtain the transfer speed of the transfer roller and control the paper feeding roller to run at the transfer speed, where the rotation speed point is located between the leading edge sensor and the transfer roller.

8. The device according to claim 7, wherein the control module is further configured to, if the first distance is equal to the second distance, control the paper feeding roller to convey the subsequent conveyed paper at the first paper feeding speed.

9. The device according to claim 7, wherein Before determining the first time when the paper feeding roller conveys the currently conveyed paper from the corresponding paper feeding point to the leading edge sensor, the control module is further configured to control the paper feeding roller to run at an initial paper feeding speed. The timing module is further configured to determine the initial time required for the first conveyed paper to be conveyed from the corresponding paper feeding point to the leading edge sensor. The processing module is further configured to determine an initial distance according to the initial time and the initial paper feeding speed, where the initial distance is the distance from the corresponding paper feeding point of the first conveyed paper to the leading edge sensor. The processing module is further configured to, if the initial time is not equal to the standard conveying time, update the initial paper feeding speed to the quotient of the initial distance and the standard conveying time. The control module is further configured to control the paper feeding roller to convey the first conveyed paper at the updated initial paper feeding speed.

10. The device according to claim 7, wherein the control module is further configured to, when detecting that the paper head of the currently conveyed paper reaches the transfer roller, control the paper feeding roller to stop running; or, start timing after detecting that the paper head of the currently conveyed paper reaches the transfer roller, and after a stop time, control the paper feeding roller to stop running, where the stop time is less than or equal to the paper tail separation time of the currently conveyed paper, and the paper tail separation time is determined according to the first distance and the transfer speed.

11. The device according to claim 10, wherein the processing module is further configured to obtain a pre-stored third distance and a third time, where the third distance is the distance from the corresponding paper feeding point of the conveyed paper in a full paper state to the leading edge sensor, and the third time is the time required for the paper tail of the conveyed paper to leave the paper feeding point from when the paper head of the conveyed paper reaches the transfer roller in a full paper state. Determine the distance difference between the third distance and the first distance, and determine the quotient of the distance difference and the transfer speed as a fourth time; determine the difference between the third time and the fourth time as the paper tail separation time.

12. The device according to claim 7, characterized in that, The rotation speed point is set at the leading edge sensor.

13. An electronic device, characterized in that, Comprising: At least one processor; And At least one memory communicatively connected to the processor, wherein: The memory stores program instructions, and the processor can execute the method according to any one of claims 1 to 6 by invoking the program instructions.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein the method according to any one of claims 1 to 6 is implemented when the program is executed by the processor.

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