Hewlett-packard Development Company, L.p.

Wei Lit Teoh

Wee Hien Tok

Jun Hong Goh

Li-Wen Benedict Tan

Eugene Goh

Xiaoxi Huang

Hua Zhou

Kok Chai Chong

John A Dangelewicz

Ban Ho Chong

Wesley Chia

Ken Ko

Fei Nie

Angel Astorgano-Ballesteros

Hwee Boon Tan

Yong Seng Pun

Kian Yaw Goh

Narayanasamy Periyasamy

Bachu K Venkatesh

Lian Chye Tan

Ivan Oong

Felicia Rezanda

Yong Poo Heng

Mark Caga-anan

Xu-Gang Wang

Casey Chong

In some examples, the disclosure describes a printing device that includes a processor resource, and a non-transitory memory resource storing machine-readable instructions stored thereon that, when executed, cause the processor resource to: estimate a drying time of a print medium received at an output roller from a print zone, activate the output roller at a first speed to move the print medium to an output tray in response to receiving the print medium from the print zone, alter a direction of the output roller to move the print medium toward a turn roller at a second speed based on the drying time of the print medium, and stop the output roller to prevent the print medium from reaching the turn roller for a period of time based on the drying time.

Output roller alterations based on drying times

In some examples, a controller can include a processing resource and a memory resource storing instructions to cause the processing resource to determine a reservoir for a spitting operation of a printhead in an imaging device based on predetermined reservoir data, determine a spit type for the spitting operation of the printhead, and cause the spitting operation to occur in the reservoir using the determined spit type.

Spitting operations for printheads

According to examples, an apparatus may include a processor and a memory on which are stored computer-readable instructions that, when executed by the processor, may cause the processor to receive a first sheet count before execution of a print job, receive a second sheet count after execution of the print job, and determine a number of sheets printed for the print job based on the first sheet count and the second sheet count. The processor may update a pick mechanism activation counter value based on the determined number of printed sheets. Based on a determination that the updated pick mechanism activation counter value is greater than or equal to a predetermined threshold value, the processor may cause a pick mechanism to be actuated to sense a media stack height of print media.

Actuation of pick mechanisms for media stack height sensing based on number of printed sheets

An apparatus () with moveable platen ribs (), is described. The apparatus comprises a platen () for supporting print media (). The platen extends in a plane in which the print media is conveyed to be printed. The apparatus further includes a first set of platen ribs () and a second set of platen ribs () each mounted on the platen. The second set of platen ribs are moveable approximately perpendicular to the plane.

Moveable platen ribs

The present subject matter discloses detection of positions of print medium for driving the print medium for printing in a printing system, in an example implementation, a motor is operated for driving the print medium, at a first specific speed, along a media-path in the printing system. After a first specific number of rotations of the motor, it is detected, based on identification of a torque change event, that the print medium at a de-skew position in the media-path. At the de-skew position a leading edge of the print medium is at a de-skew unit of the printing system and the torque change event is indicative of a deviation in a current operating torque of the motor from a standard operating torque of the motor.

Print medium position detection

A printing apparatus determines a change in torque of a motor that moves a pick arm for translating print media, determines based on the change in torque whether a media in present adjacent to the pick arm.

Media detectors

The present subject matter describes determination of amount of print media present in an input tray of a printing system. In an example implementation of the present subject matter, a current operating torque of a motor that moves a pick arm for drawing print media from the input tray is monitored. The current operating torque is monitored while the pick arm is moved between a rest position and a pick-ready position. Based on the monitored operating torque, it is determined whether amount of print media present in the input tray is one of below and above a predefined amount of print media.

Print media amount determination

A sheet fed device having a media tray and a sensor assembly is disclosed. The media tray includes a major surface having a leading portion and a trailing portion. The sensor assembly is operably coupled to the media tray. The sensor assembly includes a detector spaced-apart from and movable relative to the media tray in a path laterally across the major surface between the leading portion and the trailing portion.

Sheet fed device

In one example, a system for a inline duplexer media path includes a first print media pathway extending from an input roller to an output roller, wherein the first print media pathway provides the print media through a print zone, and a second print media pathway extending from the output roller to the input roller, wherein the second print media pathway is substantially parallel and separate from the first print media pathway.

Inline duplexer media path

A method for fluid-density modulated auto-duplexing is disclosed. This method determines when a final swath of a printing operation on a surface of a media occurs within a predefined distal end portion of the media. An estimated media dry time after the final swath in the predefined distal end portion is determined to be greater than a predetermined time. The estimated dry time is capped to a predetermined minimum media dry time and a course of action for a feed mechanism is selected to reduce curling and cockling of the media. Furthermore, a non-transitory computer readable medium and a printer having fluid-density modulated auto-duplexing are also disclosed.

Density modulated auto-duplexing

In one example, a device for partially dried inkjet media output management includes a starwheel positioned on a first side between a number of rollers positioned on a second side to corrugate partially dried inkjet media between the starwheel and the number of rollers.

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Singapore, Singapore

Wei Lit Teoh