A paper feed system for use in a printing apparatus that detects multi-feeds and separates all sheets while allowing a single sheet to continue is disclosed. The separation system uses a motor for the separator roller that can be torque controlled, allowing varying torques depending on media type and/or user input. The separation system can also detect multi-feeds, correct them, and ultimately feed one sheet at a time through the automatic document feeder.

A sheet feeding apparatus includes a sheet stacking unit on which a sheet is stacked, a feed member configured to abut against the sheet stacked on the sheet stacking unit to feed the sheet, a friction member disposed on the sheet stacking unit so as to be opposed to the feed member; a drive unit configured to drive the feed member, a detection unit configured to detect a load on the drive unit when the drive unit drives the feed member, and a control unit configured to control the drive unit. The control unit causes the drive unit to drive the feed member at a first speed and thereafter in a case where the load detected by the detection unit satisfies a predetermined condition, the control unit causes the drive unit to drive the feed member at a second speed higher than the first speed.

A sheet feeding apparatus includes a sheet stacking unit on which a sheet is stacked, a feed member configured to abut against the sheet stacked on the sheet stacking unit to feed the sheet, a friction member disposed on the sheet stacking unit so as to be opposed to the feed member; a drive unit configured to drive the feed member, a detection unit configured to detect a load on the drive unit when the drive unit drives the feed member, and a control unit configured to control the drive unit. The control unit causes the drive unit to drive the feed member at a first speed and thereafter in a case where the load detected by the detection unit satisfies a predetermined condition, the control unit causes the drive unit to drive the feed member at a second speed higher than the first speed.

Disclosed are a buffer material conveying and winding device, a buffer material conveying method and an assembly binding system, belonging to the technical field of a chip on glass. The buffer material conveying and winding device comprises a rack, a feed roller, a feed servo motor, a recycling roller, a recycling torque motor, a measuring device, a controller and an alarm. The controller may monitor whether the recycling length meets the requirement through the measuring device. The buffer material conveying method is based on the buffer material conveying and winding device. The assembly binding system comprises a buffer material conveying and winding device, a buffer material and a pressing head device.

A sheet feeding apparatus includes a sheet stacking portion, and a sheet feeding unit having a rotary feeding member and a separation member defining a nip portion together with the rotary feeding member, with the nip portion separating the sheet fed by the rotary feeding member from another sheet. A load detecting unit detects a conveyance load acting on the sheet feeding unit while feeding the sheet, and a control unit controls the sheet feeding unit to start to feed a second sheet succeeding to a first sheet at a first timing in a case where the conveyance load detected while feeding the first sheet is less than a threshold value, and starts to feed the second sheet at a second timing which is later than the first timing in a case where the conveyance load detected while feeding the first sheet exceeds the threshold value.

A sheet feeding apparatus includes a sheet stacking portion, and a sheet feeding unit having a rotary feeding member and a separation member defining a nip portion together with the rotary feeding member, with the nip portion separating the sheet fed by the rotary feeding member from another sheet. A load detecting unit detects a conveyance load acting on the sheet feeding unit while feeding the sheet, and a control unit controls the sheet feeding unit to start to feed a second sheet succeeding to a first sheet at a first timing in a case where the conveyance load detected while feeding the first sheet is less than a threshold value, and starts to feed the second sheet at a second timing which is later than the first timing in a case where the conveyance load detected while feeding the first sheet exceeds the threshold value.

A motor control device includes a phase determiner, a detector, and a controller configured to control the driving current so that a deviation between a value of a torque current component of the driving current detected by the detector and a target value of the torque current component is reduced, and perform field weakening for weakening an intensity of magnetic flux through the winding. In a state where a value corresponding to a rotational velocity is greater than a first predetermined value, the controller sets a degree of the field weakening to a first degree in a case where the value of the torque current component is greater than a second predetermined value, and sets the degree of the field weakening to a second degree smaller than the first degree in a case where the value of the torque current component is smaller than the second predetermined value.

A conveyance mechanism capable of attaining high conveyance performance and protecting a conveyance object and a mechanism itself, a medium processing device and a conveyance method using the conveyance mechanism are provided to solve the problem. The conveyance mechanism includes a conveyance passage which is a passage where a conveyance object is conveyed, a conveyance member moving the conveyance object along the conveyance passage, a motor driving the conveyance member, a control part controlling an output torque of the motor, a conveyance state identifying means identifying a conveyance state that is a position and/or a conveyance direction of the conveyance object in the conveyance passage, and a storage part which upper limit torque information which is an upper limit value of an output torque allowable for the motor or a parameter value required for calculation of the upper limit value is registered for each type of the conveyance state.

A conveyance mechanism capable of attaining high conveyance performance and protecting a conveyance object and a mechanism itself, a medium processing device and a conveyance method using the conveyance mechanism are provided to solve the problem. The conveyance mechanism includes a conveyance passage which is a passage where a conveyance object is conveyed, a conveyance member moving the conveyance object along the conveyance passage, a motor driving the conveyance member, a control part controlling an output torque of the motor, a conveyance state identifying means identifying a conveyance state that is a position and/or a conveyance direction of the conveyance object in the conveyance passage, and a storage part which upper limit torque information which is an upper limit value of an output torque allowable for the motor or a parameter value required for calculation of the upper limit value is registered for each type of the conveyance state.

A sheet conveyance device including: a conveyance roller that conveys a sheet; a motor that rotationally drives the conveyance roller at a constant speed; a central processing unit (CPU) that: periodically acquires temperature increase rates for the motor from a start of sheet conveyance, the temperature increase rates depending on magnitudes of effective current applied to the motor, the effective current depending on loads during sheet conveyance; and estimates a current temperature of the motor based on a cumulative value calculated from the temperature increase rates and time elapsed from the start of sheet conveyance; and a controller that executes a motor temperature control based on the estimated temperature of the motor.