Hp Indigo B.v.

Hewlett-packard Development Company, L.P.

John W Godden

David Sabo

Paul C Ray

Guang Jin Li

Stanley J Kozmiski

Mun Yew Lee

Robert J Manders

Jeffrey Zampell

Alex DeRegules

Christopher Sean Tanner

Neil Doherty

Eric G Nelson

Matthew Grant Lopez

Jaren D Marler

James Pingel

Christian Schmid

Shachar Berger

Thomas J Tarnacki

Oran Levintant

Forest Patton

David F Chiu

Amir Ofir

Jaren D Marier

Paul D Rauscher

Zvika Cohen

In one example in accordance with the present disclosure, a developer unit seal is described. The developer unit seal includes an endcap. The endcap has an opening to receive a dynamic seal for a roller, an inlet to receive print fluid, and a channel embedded in a surface of the endcap. The channel connects the inlet with the opening to direct print fluid to the opening. The developer unit seal also includes a sealing member to cover the channel.

Developer unit seals with endcaps having channels

In one example in accordance with the present disclosure, a developer unit seal is described. The seal includes a first sealing member to contact an end cap of the developer unit. The first sealing member has ports to align with rollers that are to protrude into the end cap. The seal includes a second sealing member to contact the first sealing member. The second sealing member has ports to align with the rollers. Channels are disposed between the first sealing member and the second sealing member to direct print fluid to each of the ports.

Developer unit seals with fluid channels

A binary printing fluid developer assembly may include a developer roller to receive a printing fluid and transfer a portion of the printing fluid to a photoconductive member; a number of electrodes to create an electrical potential bias between the number of electrodes and the developer roller; a cleaner roller to remove an amount of printing fluid from the developer roller; and a sponge roller to clean the cleaner roller wherein a gap is maintained between the sponge roller and the number of electrodes.

Printing fluid developer assembly

A printing fluid developer that includes a developer roller; a cleaner roller forming a nip with the developer roller and held by a number of bearings at each end that are free to move within a slot towards and away from the developer roller; and at least one spring biased to force the bearings towards one side of the slot.

Spring in a printing fluid developer

In an example, a print agent application assembly includes a print agent transfer roller to receive print agent and transfer a portion of the print agent to a photoconductive surface and a print agent regulator roller to regulate a film thickness of print agent on the print agent transfer roller. The print agent regulator roller may include a nip forming region and a first mounting region. The print agent application assembly may further include a first resilient component which spans a diametrical width of the print agent regulator roller and acts on the print agent regulator roller outside the nip forming region to impart a lateral force to the first mounting region, the lateral force urging the print agent regulator roller towards the print agent transfer roller.

Print agent application assemblies

A print agent application assembly is disclosed. The print agent application assembly may include a first roller to remove print agent from a surface of a print agent transfer roller. The print agent application assembly may include a second roller having an absorbent element to engage the first roller as the second roller rotates relative to the first roller, the absorbent element to absorb print agent from the first roller. The print agent application assembly may include a wiper assembly. The wiper assembly may include a wiper element to scrape print agent from the surface of the first roller as the first roller rotates, and an engagement element to engage with and compress a portion of the absorbent element of the second roller as the second roller rotates relative to the wiper assembly. A method and a roller cleaning assembly are also disclosed.

Wiper assemblies

In one example, a seal for a developer roller in a liquid electrophotographic printer includes an arcuate body curved along a body arc. The body has an inboard face that defines an annular sealing surface along the body arc to contact a face on one end of the developer roller and a guide surface across the body arc at a first end of the annular sealing surface. The guide surface is oriented along a chord of the body arc and intersects the body arc at an obtuse interior angle, to guide any ink encountering the guide surface outward toward the circular outer surface of the developer roller.

Roller seal for a developer unit in a liquid electrophotographic printer

In some examples, a printing liquid developer includes a developer roller that has a hollow tubular base body formed of a material including conductive carbon fiber, a conductive, compliant layer around an outer surface of the hollow tubular base body, and an electrically conductive support separate from the hollow tubular base body and electrically contacted to a surface of the hollow tubular base body.

Printing liquid developer

Examples of printing devices are described. Such printing devices may include an end cap having an engaging portion and a hook portion, a roller, and a latch unit to hold the roller in contact with the end cap when the latch unit is in a closed position. The latch unit may include a latch having a protrusion to engage with the engaging portion of the end cap, and a spring attached to the end cap and to the latch. In one example, the hook portion of the end cap is to hold the latch in a closed position in counteraction to a force provided by the spring under a tension.

Latches for holding printing device rollers in contact with end caps

In one example, a processor readable medium has instructions thereon that, when executed by a processor, cause a system to detect a change in electrical conduction of a liquid moving at an interface between two surfaces and determine a conductivity of the liquid based on the detected change in conduction.

Determining the conductivity of a liquid

Various embodiments and methods relating to moving a printed upon web along bowed segments of a web path through at least three consecutive turns in a same direction are disclosed.

Media treatment web flow path

In one embodiment, an image developer includes a developer roller rotatable along a photoconductor for presenting a layer of ink to the photoconductor and a cleaner for cleaning ink from the developer roller. The cleaner includes a first cleaning roller rotatable along the developer roller for removing ink from the developer roller and a second cleaning roller rotatable against the first cleaning roller for mechanically removing ink from the first cleaning roller. In one embodiment, the second cleaning roller deforms against the first cleaning roller such that the cross-sectional length of contact between the first and second cleaning rollers is in the range of 20% to 38% of the circumference of the first cleaning roller. In one embodiment, the second cleaning roller has a density in the range of 90 kg/mto 150 kg/m.

Image developer for presenting ink to a photoconductor

A web flow path extends in a first direction opposite a print head and in a second opposite direction from the print head to a dryer.

Growing community of inventors

San Diego, CA, United States of America

John W Godden