Hewlett-Packard Development Company, L.p.

Hp Indigo B.v.

Yossi Yaacobov

Mordechai Arenson

Marko Richter

Michel Assenheimer

Alex Feygelman

Lavi Cohen

Gil Fisher

Michael Vinokur

Nadav Shalem

Chen Talmor

Alex Lipnizkiy

Tomer Bunker

In an example, a printing apparatus may include, a rotatable shaft, a removable drum mounted on the shaft and a fixing element to fixedly couple the removable drum to the shaft, so that the removable drum is to rotate with the shaft. The printing apparatus may also include a heater, a printing apparatus satellite component located adjacent to the removable drum and engageable with the removable drum and a controller. The controller may be to receive a command to prepare the removable drum for removal; and in response, control the shaft to rotate the removable drum; control the heater to heat the removable drum while it rotates; and control the printing apparatus to engage the satellite component of the printing apparatus with the removable drum while it rotates.

Printer drum removal preparation

There is disclosed a selective wetting apparatus comprising a roller rotatable about a roller axis and comprising a wettable roller surface; an applicator unit having a lip which extends parallel to the roller axis and is radially spaced apart from the roller surface by a gap, wherein the applicator unit is to convey liquid agent towards the roller so that the liquid agent forms a liquid bridge over the gap to wet a wetted axial portion of the roller surface; and a flow guide to direct a gas flow into a regulated axial portion of the gap to locally prevent formation of a liquid bridge, and thereby prevent wetting of a corresponding axial portion of the roller surface.

Selective wetting of a roller

There is disclosed apparatus for wetting a roller of a printing system comprising an applicator unit comprising a liquid agent chamber. Upper and lower walls extend from the liquid agent chamber to define a slit therebetween. The upper wall extends beyond a lip of the lower wall to a transfer lip. A flow restrictor is received in the slit to prevent flow of liquid agent to a respective portion of the transfer lip, thereby defining a restricted portion of the slit and an adjacent unrestricted portion of the slit. The flow restrictor fits in the restricted portion with a clearance that permits liquid agent flow at a reduced velocity relative flow through the unrestricted portion, such that liquid agent along the restricted portion is discharged from the lower wall. A method of installing a flow restrictor is also disclosed.

Wetting apparatus

In one example, a method comprises measuring, by a processor, the flow rate of a cleaning fluid to clean at least a portion of a printing apparatus. The measured flow rate is compared to a desired flow rate. When the measured flow rate is outside of a first deviation from the desired flow rate, but within a second deviation from the desired flow rate, then the method in this example comprises changing the operation of a component of a printing apparatus.

Determining cleaning fluid flow at a print apparatus

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Ness Ziona, Israel

Yossi Yaacobov