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US-12625454-B2 - Sheet conveying device, image processing apparatus, and drive control method capable of suppressing temperature rise of motor with simple configuration

US12625454B2US 12625454 B2US12625454 B2US 12625454B2US-12625454-B2

Abstract

A sheet conveying device includes a motor, a first determination processing portion, and a first restriction processing portion. The motor is used to convey a sheet. The first determination processing portion determines, each time a predetermined determination timing arrives during drive of the motor, whether or not a total drive time of the motor in a predetermined determination period up to the arrival of the determination timing exceeds a predetermined first time. The first restriction processing portion restricts the drive of the motor when the first determination processing portion determines that the total drive time exceeds the first time.

Inventors

  • TUNG SON NGUYEN

Assignees

  • KYOCERA DOCUMENT SOLUTIONS INC.

Dates

Publication Date
20260512
Application Date
20250210
Priority Date
20240306

Claims (4)

  1. 1 . A sheet conveying device comprising: a motor used to convey a sheet; a first determination processing portion configured to determine, each time a predetermined determination timing arrives during drive of the motor, whether or not a total drive time of the motor in a predetermined determination period up to the arrival of the determination timing exceeds a predetermined first time; a first restriction processing portion configured to restrict the drive of the motor when the first determination processing portion determines that the total drive time exceeds the first time; a second determination processing portion configured to determine whether or not an elapsed time from start of the drive of the motor immediately before a reference time at which the drive of the motor is started to the reference time exceeds a length of the determination period; and a second restriction processing portion configured to restrict the drive of the motor when the second determination processing portion determines that the elapsed time exceeds the length of the determination period and a time of the drive of the motor from the reference time exceeds a second time that is shorter than the first time, wherein the first restriction processing portion switches, when the first determination processing portion determines that the total drive time exceeds the first time, a conveying mode of the sheet from a normal conveying mode in which the motor is continuously driven to a low-speed conveying mode in which the motor is intermittently driven, the first restriction processing portion determines, when the conveying mode is shifted to the low-speed conveying mode, whether or not the total drive time of the motor in the determination period is equal to or less than a third time, which is shorter than the first time, every time the determination timing arrives, and the first restriction processing portion switches, when it is determined that the total drive time is equal to or less than the third time, the conveying mode from the low-speed conveying mode to the normal conveying mode.
  2. 2 . The sheet conveying device according to claim 1 , wherein the second time is set based on a difference between the length of the determination period and a stop time of the motor up to the reference time, and the first time.
  3. 3 . An image processing apparatus comprising: the sheet conveying device according to claim 1 ; and an image reading portion configured to read an image of the sheet conveyed by the sheet conveying device.
  4. 4 . A drive control method executed in a sheet conveying device including a motor used to convey a sheet, comprising: a first determination step of determining, each time a predetermined determination timing arrives during drive of the motor, whether or not a total drive time of the motor in a predetermined determination period up to the arrival of the determination timing exceeds a predetermined first time; a first restriction step of restricting the drive of the motor when it is determined in the first determination step that the total drive time exceeds the first time; a second determination step of determining whether or not an elapsed time from start of the drive of the motor immediately before a reference time at which the drive of the motor is started to the reference time exceeds a length of the determination period; and a second restriction step of restricting the drive of the motor when it is determined in the second determination step that the elapsed time exceeds the length of the determination period and a time of the drive of the motor from the reference time exceeds a second time that is shorter than the first time, wherein in the first restriction step, when the first determination step determines that the total drive time exceeds the first time, a conveying mode of the sheet is switched from a normal conveying mode in which the motor is continuously driven to a low-speed conveying mode in which the motor is intermittently driven, in the first restriction step, when the conveying mode is shifted to the low-speed conveying mode, whether or not the total drive time of the motor in the determination period is equal to or less than a third time, which is shorter than the first time, is determined every time the determination timing arrives, and in the first restriction step, when it is determined that the total drive time is equal to or less than the third time, the conveying mode is switched from the low-speed conveying mode to the normal conveying mode.

Description

INCORPORATION BY REFERENCE This application is based upon and claims the benefit of priority from the corresponding Japanese Patent Application No. 2024-033454 filed on Mar. 6, 2024, the entire contents of which are incorporated herein by reference. BACKGROUND The present disclosure relates to a sheet conveying device, an image processing apparatus, and a drive control method. There is known an image processing apparatus including an image reading portion for reading an image of a document sheet and a document sheet conveying portion for conveying a document sheet whose image is read by the image reading portion. In addition, an image processing apparatus capable of suppressing a temperature rise of a motor for driving the document sheet conveying portion is known as a related art. SUMMARY A sheet conveying device according to one aspect of the present disclosure includes a motor, a first determination processing portion, a first restriction processing portion, a second determination processing portion, and a second restriction processing portion. The motor is used to convey a sheet. The first determination processing portion determines, each time a predetermined determination timing arrives during drive of the motor, whether or not a total drive time of the motor in a predetermined determination period up to the arrival of the determination timing exceeds a predetermined first time. The first restriction processing portion restricts the drive of the motor when the first determination processing portion determines that the total drive time exceeds the first time. The second determination processing portion determines whether or not an elapsed time from start of the drive of the motor immediately before a reference time at which the drive of the motor is started to the reference time exceeds a length of the determination period. The second restriction processing portion restricts the drive of the motor when the second determination processing portion determines that the elapsed time exceeds the length of the determination period and a time of the drive of the motor from the reference time exceeds a second time that is shorter than the first time. An image processing apparatus according to another aspect of the present disclosure includes the sheet conveying device and an image reading portion. The image reading portion reads an image of the sheet conveyed by the sheet conveying device. A drive control method according to another aspect of the present disclosure is performed in a sheet conveying device including a motor used to convey a sheet, and includes a first determination step, a first restriction step, a second determination step, and a second restriction step. In the first determination step, each time a predetermined determination timing arrives during drive of the motor, it is determined whether or not a total drive time of the motor in a predetermined determination period up to the arrival of the determination timing exceeds a predetermined first time. In the first restriction step, the drive of the motor is restricted when it is determined in the first determination step that the total drive time exceeds the first time. In the second determination step, it is determined whether or not an elapsed time from start of the drive of the motor immediately before a reference time at which the drive of the motor is started to the reference time exceeds a length of the determination period. In the second restriction step, the drive of the motor is restricted when it is determined in the second determination step that the elapsed time exceeds the length of the determination period and a time of the drive of the motor from the reference time exceeds a second time that is shorter than the first time. This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description with reference where appropriate to the accompanying drawings. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Furthermore, the claimed subject matter is not limited to implementations that solve any or all disadvantages noted in any part of this disclosure. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a system configuration of an image forming apparatus according to an embodiment of the present disclosure. FIG. 2 is a diagram showing configurations of an ADF and an image reading portion of the image forming apparatus according to the embodiment of the present disclosure. FIG. 3 is a timing chart showing an example of a change with time in the drive state of the motor of the image forming apparatus according to the embodiment of the present disclosure. FIG. 4 is a timing chart showing an example of a change with time in the drive state of the motor of the image forming apparatus according to the embodiment of the