Abstract: It is hereby disclosed a method to print on porous substrate by a printer comprising: a print zone; a conveyor to receive a porous substrate on a loading zone and to move the porous substrate along a transport direction between the print zone and the loading zone; a print engine positioned on the print zone for ejecting printing fluid towards the porous substrate; wherein the method comprises ejecting printing fluid towards a front side the porous substrate and, by a controller, activating a vacuum source as to exert a vacuum on a back side of the porous substrate being the vacuum exerted while the porous substrate is within the print zone.

Abstract: Examples relate to methods to heat a print agent deposited on a print agent, print an image on a print media and heating systems for a heating a print agent deposited on a print media. A heating system comprises a radiation emitter to irradiate a print agent deposited on a print media, a reflector to reflect a radiation emitted by the radiation emitter back to the radiation emitter, and a displacing member to shift the heating system between a pre-heating position wherein the radiation reflected back to the radiation emitter has a higher magnitude and a heating position wherein the radiation reflected back to the radiation emitter has a lower magnitude.

Abstract: Examples relate to methods to heat a print agent deposited on a print agent, print an image on a print media and heating systems for a heating a print agent deposited on a print media. A heating system comprises a radiation emitter to irradiate a print agent deposited on a print media, a reflector to reflect a radiation emitted by the radiation emitter back to the radiation emitter, and a displacing member to shift the heating system between a pre-heating position wherein the radiation reflected back to the radiation emitter has a higher magnitude and a heating position wherein the radiation reflected back to the radiation emitter has a lower magnitude.

Abstract: A thermal treatment unit for a printer is mountable on a carriage that moves across a printing medium. The thermal treatment unit comprises an emitter element to emit radiation towards the printing medium to thermally treat the printing medium, wherein the thermal treatment unit varies a radiation power output of the emitter element in terms of a spatial position of the carriage along a width direction of the printing medium.

Abstract: An example apparatus to produce a three-dimensional object comprises a controller, a build area configured to receive a layer of particulate material, a printhead, and an ultraviolet light emitting diode energy source. The controller is to cause the printhead to deposit a liquid which absorbs ultraviolet radiation onto the layer of particulate material. The controller is further to cause the ultraviolet light emitting diode energy source to irradiate the liquid, after the liquid has been deposited onto the layer of particulate material, thereby to heat the liquid and cause a portion of the particulate material to solidify.

Abstract: Disclosed herein is an adhesive belt for use in a printing device, a printing device, and a method of operating a printing device. The adhesive belt is to be placed around a conveyer belt of a printing device. The adhesive belt comprises a contact surface that is to come in contact with a print medium, wherein the contact surface comprises a dry adhesive material. The adhesive belt further comprises a fastener that is to open and close the adhesive belt by reversibly joining opposing end portions of the adhesive belt.

Abstract: A printing apparatus comprises a depositing device and a sublimation device. The depositing device may deposit a print fluid on a first surface of a print medium. The print fluid comprises a sublimation agent to sublimate at a sublimation temperature. The sublimation device may sublimate the sublimation agent deposited on the print medium by generating heat radiation in a direction from a second surface of the print medium towards the first surface, the second surface being opposite to the first surface.

Abstract: It is hereby disclosed a method to print on porous substrate by a printer comprising: a print zone; a conveyor to receive a porous substrate on a loading zone and to move the porous substrate along a transport direction between the print zone and the loading zone; a print engine positioned on the print zone for ejecting printing fluid towards the porous substrate; wherein the method comprises ejecting printing fluid towards a front side the porous substrate and, by a controller, activating a vacuum source as to exert a vacuum on a back side of the porous substrate being the vacuum exerted while the porous substrate is within the print zone.

Abstract: An example apparatus to produce a three-dimensional object comprises a controller, a build area configured to receive a layer of particulate material, a printhead, and an ultraviolet light emitting diode energy source. The controller is to cause the printhead to deposit a liquid which absorbs ultraviolet radiation onto the layer of particulate material. The controller is further to cause the ultraviolet light emitting diode energy source to irradiate the liquid, after the liquid has been deposited onto the layer of particulate material, thereby to heat the liquid and cause a portion of the particulate material to solidify.

Abstract: A product including a textile substrate and an image printed on the textile substrate in a predetermined area wherein surface fibers and lint are selectively removed from the textile substrate in the predetermined area by burning.

Abstract: A method of cutting or scoring a substrate comprises: providing a substrate which has a maximum of radiation absorption at a first wavelength band; depositing on the substrate, in a predetermined pattern, a heating fluid which has a maximum of radiation absorption at a second wavelength band; and exposing a surface region of the substrate to electromagnetic radiation at the second wavelength band, the surface region including the predetermined pattern, to cut or mark the substrate along the predetermined pattern. The first wavelength band differs from the second wavelength band.

Abstract: Examples of the present disclosure relate to a method for providing a status of a radiation emitter of a printing device, the method comprising image sensing at least part of a print agent after deposition onto a print substrate and after heating by the radiation emitter: obtaining, based on the image sensing, an irradiance applied on the heated print agent and providing a status of the radiation emitter in response to determining a deviation of the irradiance with respect to an expected irradiance.

Abstract: Obstacle detection for a moving element activated by a motor is disclosed. The obstacle detection may comprise a controller to: move the element at a substantially constant speed; determine an actual torque value to move the element at the constant speed; determine a torque parameter based on the actual torque value; comparing the torque parameter with a threshold value; and determining the presence of an obstacle if the torque parameter is above the torque parameter threshold; wherein the torque parameter is determined based on a set of historical torque values and the actual torque value.

Abstract: In an example, a media conveyor includes a media support platform having a suction hole, and a valve to selectively close the suction hole. A valve actuator to actuate the valve includes an air tube having an air inlet and a seal to selectively seal the air inlet.

Abstract: In one example, a device for unwinding or winding multiple rolls of print substrate includes multiple spindles each to hold a roll of print substrate and a differential operatively connected to one end of each spindle. The spindles are aligned with one another lengthwise along a spindle axis and the differential is to output torque along a differential axis offset from the spindle axis to turn the spindles on the first axis.

Abstract: A printing carriage comprises a printhead, and two sensors for scanning an image deposited on a print media by the printhead. The sensors are provided on opposite sides of the printhead in a direction of movement of the printhead so that, during a printing pass of the printhead on the print media, one sensor is positioned on a trailing side of the moving printhead.

Abstract: Dye-sublimation printers and methods are disclosed for porous substrates or for polyester-coated substrates. In an example the device comprises a substrate path, a printhead, over a print zone of the substrate path, to transfer a print fluid on the substrate; a narrow band radiation source, over a sublimation zone of the substrate path to sublimate a portion of the transferred print fluid to form an image on the substrate; and an advancing mechanism, to transfer the substrate from the print zone to the sublimation zone.

Abstract: It is disclosed a print-head carriage comprising base and a tab with a rotatable connection to the base on a first end, the rotation of the tab defining a closed position in which a second end opposite to the first end is in contact with the base and an open position in which the second end is separated from the base, the base being adapted to receive a print-head along an insertion direction when the tab is in the open position wherein the tab further comprises a latch located at a position remote to the rotatable connection comprising a lever, that separates from the tab in an unlocked position and moves towards the tab in a locked position; wherein the latch comprises a biasing mechanism to bias the latch to the locked position.

Abstract: Obstacle detection for a moving element activated by a motor is disclosed.

Abstract: An example apparatus to produce a three-dimensional object comprises a controller, a build area configured to receive a layer of particulate material, a printhead, and an ultraviolet light emitting diode energy source. The controller is to cause the printhead to deposit a liquid which absorbs ultraviolet radiation onto the layer of particulate material. The controller is further to cause the ultraviolet light emitting diode energy source to irradiate the liquid, after the liquid has been deposited onto the layer of particulate material, thereby to heat the liquid and cause a portion of the particulate material to solidify.