Abstract: The present invention relates to a printer with a single printing motor and a single non-contact heating element characterized in that it includes a printing width and a paper path width greater than that of a double web width between 18.5" (46.99 cm) and 20.5" (52.07 cm), and selective control of the writing heads. The writing heads are controlled either in order to use them in a single group to print a centered double-width web, or to use them in two groups of heads to concomitantly print two single-width webs separated by a margin. Both groups of heads or each group of heads can be supplied with one color of ink.

Abstract: A device for collecting solar energy and conveying it to a zone to be heated. It comprises a tube in two parts, the first part (evaporator) being surrounded by a vacuum and being covered with a heat absorbing material and exposed to the solar radiation. The tube contains a fluid which vaporized in the first part and absorbs heat and condenses in the second part and gives up the previously-stored heat. The fluid in the liquid phase is returned to the first part by a capillary system.

Abstract: The invention relates to a tracing apparatus operating automatically on the basis of digital imputs.A buffer-loop is formed in the paper band between each drive roll and the control drum, and the loops so formed are balanced by a loop corrector/reader device. In one prior art apparatus, this device includes photoelectric cells.The tracing apparatus is characterized in that it includes three suction chambers, one for each buffer-loop and a third central chamber beneath the control drum, whereby two saggings of the paper are obtained on either side of the control drum that are entirely independent of the two buffer-loops.

Abstract: The invention relates to a negative pressure or depression detector characterized in that it includes a floating element which forms at once a detecting element and the movable disc or plate of an air capacitor.The floating element is placed inside a chamber having its lower end vented and its upper end communicating with the depression source, the fixed plate of the capacitor being located at the lower end of the chamber without interfering with the venting.

Abstract: 4.