In some examples, printing device performance analysis may include actuating a motor to operate a first separation tire of a printing device in a first rotary direction. The first separation tire may be operable adjacent to a second separation tire rotatable in a second rotary direction that is opposite to the first rotary direction to separate physical media. Printing device performance analysis may further include actuating the motor to operate the first separation tire in the second rotary direction, and determining whether a motor torque difference of the motor between the first and second rotary directions is greater than a predetermined threshold.

A medium conveying apparatus includes a plurality of feed rollers, each feed roller rotating independently at a respective speed to feed a medium, a first sensor located on a downstream side of the plurality of feed rollers in a medium conveying direction and also in a central part in a direction perpendicular to the medium conveying direction, to detect the medium, a second sensor and a third sensor located on both sides of the first sensor in the direction perpendicular to the medium conveying direction, to respectively detect the medium, and a processor to change the speed of one of the plurality of feed rollers at least until the first sensor detects the medium when any of the second sensor or the third sensor detects the medium and the first sensor does not detect the medium within a predetermined time.

A sheet feeding device includes a sheet feeding roller, a following roller, a rotational speed detection part, and a control part. The rotational speed detection part is configured to detect a rotational speed of the following roller. The control part is configured to accelerate a rotation of the sheet feeding roller and to adjust a sheet interval. The control part obtains a rotational rate of the following roller to the sheet feeding roller based on the rotational speed of the following roller, obtains an actual linear velocity of the sheet based on the rotational rate of the following roller and a theoretical linear velocity of the sheet after accelerating the rotation of the sheet feeding roller, and then adjusts the sheet interval based on the actual linear velocity of the sheet.

A sheet conveying device includes a sheet loader, a sheet feeder, an optical sensor, and a rotary member. The sheet loader is configured to load a sheet. The sheet feeder is configured to feed the sheet loaded on the sheet loader. The optical sensor is configured to detect the sheet at a predetermined position on the sheet loader in a width direction of the sheet and at a predetermined position in a sheet conveyance passage in the width direction of the sheet. The rotary member is configured to rotate to a first position when the sheet is not at the predetermined position on the sheet loader and a second position when the sheet is at the predetermined position. The rotary member has a detection target portion configured to be detected by the optical sensor when the rotary member is located at the first or second position.

A toy device for dispensing stackable or rollable materials and related methods are described. The device has a housing arranged to contain a stack or roll of material and having a dispensing aperture. A manually actuated drive mechanism is provided by which a user can rotate a drive wheel of the drive mechanism. The drive wheel contacts and when rotated engages a portion of the material and to drive it through the dispensing aperture. A release mechanism is provided that can be moved to allow the material to be driven through the aperture. The drive mechanism can be actuated independently from the release mechanism.

A sheet feeding device includes a stacking portion, a feeding portion, a contact and separation mechanism, a separation conveying portion, a detecting portion, a size acquiring portion, and a controller. In a first mode, in a case that the detecting portion detects passing of a trailing end of the current sheet after the separating operation, the controller causes the contact and separation mechanism to start a contact operation in which the feeding portion is contacted to a sheet stacked on the stacking portion in order to feed a subsequent sheet. In a second mode, before the detecting portion detects passing of a trailing end of the current sheet after the separating operation, the controller causes the contact and separation mechanism to start, on the basis of a distance in which the current sheet is fed by the separation conveying portion, the contact operation to feed the subsequent sheet.

A sheet conveyance device includes a first conveyance member, and a drive transmission mechanism. The first conveyance member is configured to convey a sheet toward a second conveyance member. The drive transmission mechanism is configured to transmit a driving force of a driving source to the first conveyance member. The drive transmission mechanism includes a first drive transmitter and a second drive transmitter disposed coaxially with the first drive transmitter. The driving force is transmitted from the first drive transmitter to the second drive transmitter. The second drive transmitter is rotatable relative to the first drive transmitter within at least a predetermined angular range.

An image recording apparatus having a recorder, a first driving device, a second driving device, a driving-force transmission device, a sensor, a memory, and a controller to conduct a conveying process and a recording process alternately and repetitively, is provided. In the conveying process, on condition that a rotationally driven amount of the first driving device exceeded a target rotation amount, the controller conducts feedback control on the first driving device to rotate reversely. On condition that the first driving device was rotationally driven reversely under the feedback control, the controller stores a maximum value and a stopping value in the memory, determines a correction value, and determines a post-correction rotation amount based on the target rotation amount and an amount corresponding to the correction value, and in the conveying process, the controller drives the first driving device rotationally by the post-correction rotation amount.

A feeding roller structure includes a fastening frame, a transmission component, a transmission roller and a floating coupler. The transmission component is assembled in the fastening frame. The transmission component includes a drive shaft transversely pivoted to two sides of the fastening frame. The transmission roller is concentrically arranged around the drive shaft. The floating coupler is mounted to the fastening frame. The floating coupler is coupled between the drive shaft and the transmission roller. Two opposite ends of the floating coupler are adjacent to and spaced from the two sides of the fastening frame to form two gaps. Each gap is formed between one end of the floating coupler and one side of the fastening frame. The two gaps limit an angular displacement of the floating coupler.

A control unit is capable of selectively executing a first mode and a second mode, the first mode being a mode in which a plurality of sheets having different sizes including a non-standard size are fed by the feeding unit, the second mode being a mode in which a plurality of sheets having different sizes including only standard sizes are fed by the feeding unit. If the detection unit detects a sheet in a state where the supporting portion is located at the second position and the first mode is selected, the control unit waits for an instruction to start sheet feeding without causing the lifting unit to lift the supporting portion to the first position, and causes the lifting unit to lift the supporting portion to the first position in response to the instruction to start sheet feeding.