A printhead for a thermal transfer printer comprising a plurality of printing elements, each of the printing elements being configured to transfer ink from an ink carrying ribbon to a substrate, and at least one sensor arranged to sense ink carrying ribbon. The at least one sensor comprises at least one emitter arranged to emit radiation towards the ribbon and a plurality of receivers. Each of the plurality of receivers is arranged to receive a respective reflected signal reflected by the ribbon, each reflected signal is based upon radiation emitted by the at least one emitter.

Methods, systems, and apparatus for thermal transfer printing include, in at least one aspect, a printing apparatus including: a band (105) to hold hot melt ink; rollers (110) to hold and transport the band with respect to a substrate (120); a printhead (125) to thermally transfer a portion of hot melt ink from the band to the substrate; an ink feed device (135) to add hot melt ink to the band, a heating device (140) to heat the hot melt ink on the band, and a rigid blade (155) to control ink thickness of the hot melt ink on the band; a meniscus sensor (245) to monitor a meniscus of melted hot melt ink on the band; and a controller (160) communicatively coupled with the meniscus sensor and the ink feed device, wherein the controller can cause the ink feed device to add hot melt ink to the band based on data from the meniscus sensor.

Methods, systems, and apparatus for thermal transfer printing include, in at least one aspect, a printing apparatus including: a band (105) to hold hot melt ink; rollers (110) to hold and transport the band with respect to a substrate (120); a printhead (125) to thermally transfer a portion of hot melt ink from the band to the substrate; an ink feed device (135) to add hot melt ink to the band, a heating device (140) to heat the hot melt ink on the band, and a rigid blade (155) to control ink thickness of the hot melt ink on the band; a meniscus sensor (245) to monitor a meniscus of melted hot melt ink on the band; and a controller (160) communicatively coupled with the meniscus sensor and the ink feed device, wherein the controller can cause the ink feed device to add hot melt ink to the band based on data from the meniscus sensor.

A printhead for a thermal transfer printer comprising a plurality of printing elements, each of the printing elements being configured to transfer ink from an ink carrying ribbon to a substrate, and at least one sensor arranged to sense ink carrying ribbon. The at least one sensor comprises at least one emitter arranged to emit radiation towards the ribbon and a plurality of receivers. Each of the plurality of receivers is arranged to receive a respective reflected signal reflected by the ribbon, each reflected signal is based upon radiation emitted by the at least one emitter.

In some embodiments, a printing apparatus comprises a band capable of holding hot melt ink thereon, rollers configured and arranged to hold and transport the band with respect to a substrate, a printhead configured to thermally transfer a portion of hot melt ink from the band to the substrate to print on the substrate, an ink feed device configured to add hot melt ink to the band and to heat the hot melt ink on the band, and a rigid blade configured and arranged to cause hot melt ink to pass between a blade edge of the rigid blade and the band, wherein the rigid blade is shaped to minimize a contact area between the rigid blade and the band while controlling ink thickness of the hot melt ink on the band.

Methods, systems, and apparatus for thermal transfer printing include, in at least one aspect, a printing apparatus including: a band (105) to hold hot melt ink; rollers (110) to hold and transport the band with respect to a substrate (120); a printhead (125) to thermally transfer a portion of hot melt ink from the band to the substrate; an ink feed device (135) to add hot melt ink to the band, a heating device (140) to heat the ink on the band, and a rigid blade (155) that includes a pressure chamber (240); a pressure sensor (245) associated with the pressure chamber to monitor the meniscus of the melted hot melt ink on the band; and a controller (160) communicatively coupled with the pressure sensor (245) and the ink feed device, the controller to cause the ink feed device to add hot melt ink to the band based on data from the pressure sensor.

Methods, systems, and apparatus for thermal transfer printing include, in at least one aspect, a printing apparatus including: a band (105) to hold hot melt ink; rollers (110) to hold and transport the band with respect to a substrate (120); a printhead (125) to thermally transfer a portion of hot melt ink from the band to the substrate; an ink feed device (135) to add hot melt ink to the band, a heating device (140) to heat the ink on the band, and a rigid blade (155) that includes a pressure chamber (240); a pressure sensor (245) associated with the pressure chamber to monitor the meniscus of the melted hot melt ink on the band; and a controller (160) communicatively coupled with the pressure sensor (245) and the ink feed device, the controller to cause the ink feed device to add hot melt ink to the band based on data from the pressure sensor.

Methods, systems, and apparatus for thermal transfer printing include, in at least one aspect, a printing apparatus (100) including: a band (105) capable of holding hot melt ink thereon; rollers (110) arranged to hold and transport the band with respect to a substrate (120); a printhead (125) configured to thermally transfer a portion of hot melt ink from the band to the substrate; an ink feed device (135) configured to add hot melt ink to the band, a heating device (140) configured to heat the ink on the band, and a blade (155, 186) proximately located with the heating device and configured to control ink thickness of the ink on the band; and a controller (160) communicatively coupled with the blade, wherein the controller is configured to reposition the blade, in accordance with a viscosity of the ink and a speed of the band, to control the thickness of the hot melt ink on the band after the blade.

Methods, systems, and apparatus for thermal transfer printing include, in at least one aspect, a printing apparatus (100) including: a band (105) capable of holding hot melt ink thereon; rollers (110) arranged to hold and transport the band with respect to a substrate (120); a printhead (125) configured to thermally transfer a portion of hot melt ink from the band to the substrate; an ink feed device (135) configured to add hot melt ink to the band, a heating device (140) configured to heat the ink on the band, and a blade (155, 186) proximately located with the heating device and configured to control ink thickness of the ink on the band; and a controller (160) communicatively coupled with the blade, wherein the controller is configured to reposition the blade, in accordance with a viscosity of the ink and a speed of the band, to control the thickness of the hot melt ink on the band after the blade.

A removable device adapted to cooperate with a conveyor system for the installation of an endless ribbon in the conveyor system, the removable device includes at least two support elements to support the endless ribbon, each support element being movable in rotation around a rotation axis and each support element having a convex portion to support a portion of the endless ribbon.