A double-paper-roll printing device, comprising an installation frame (13) for installing the following components and paper rolls (6). A first paper roll (61) and a second paper roll (62) are installed on the installation frame (13) through a paper roll supporting shaft (14). Paper tapes of the first paper roll (61) and the second paper roll (62) are selectively fed to a printing component (01) through paper passages. The first paper roll (61) and the second paper roll (62) are selectively fed to the printing component (01) through a first paper passage (02) and a second paper passage (03) that are mutually independent. The first paper passage (02) and the second paper passage (03) are mutually overlapped. The tail end of the first paper passage (02) and the tail end of the second paper passage (03) form an intersecting end, and paper tape heads of the paper rolls enter the printing component (01) through the intersecting end. The passages of the device are completely open and convenient to maintain, the requirement for the replacement operation space of the paper rolls is low, and miniaturization of the equipment is facilitated.

A printer 11 includes a first housing part 23 that houses a first paper roll 21 that is a roll of a paper sheet P1, a second housing part 24 that houses a second paper roll 22 that is a roll of a paper sheet P2, a printing part 12 that prints on the paper sheet P1 and the paper sheet P2, a conveying part 14 that includes a holding part 19 that is configured to hold the overlapping paper sheet P1 and the paper sheet P2 respectively pulled out from a first paper roll 21 and a second paper roll 22, and conveys the paper sheet P1 out of the paper sheet P1 and the paper sheet P2 held by the holding part 19 to the printing part 12, a paper sheet sensor S1 that detects the presence of the paper sheet P1, and a controlling part 50 that makes the conveying part 14 convey the paper sheet P2 held by the holding part 19 to the printing part 12 when the paper sheet sensor S1 detects that there is no paper sheet P1 to be conveyed to the printing part 12.

A printer with a lifting device for a paper feeder comprises a frame (1), a paper feeding unit group (2) and a motor (4) both are arranged in the frame. A paper inlet (8) is arranged on one side of the frame. The paper feeding unit group and a cutter (6) are arranged on the two sides of the paper inlet. A printing module (7) is arranged downstream of the cutter. The paper feeding unit group includes a plurality of paper feeding units (21) arranged in layers. One of the paper feeding units is aligned with the paper inlet via driving the paper feeding unit group by the motor. By the movement of the paper feeding units, paper feeding paths of all the paper feeding units of the printer can be exactly the same. Thereby, each paper feeding unit does not impact each other, and it is convenient for maintenance.

A printer apparatus includes a printing part (10) including a platen roller (12) and a print head (11) for printing objects onto a recording sheet (101, 102), and a feeding part (30) for feeding the recording sheet (101, 102) to the printing part (10). The feeding part (30) includes a first feed port (31) and a second feed port (32) for feeding the recording sheet (101, 102), a first roller (41) for conveying a first recording sheet (101) fed through the first feed port (31), a second roller (42) for conveying a second recording sheet (102) fed through the second feed port (32), a delivery port (33) for feeding the recording sheet (101, 102) conveyed by the first roller and the second roller, a tension member (60) having elasticity, a third roller (43) rotatably connected to the tension member (60) and being pressed toward the first roller (41) by the elasticity of the tension member, and a fourth roller (44) rotatably connected to the tension member (60) and being pressed toward the second roller by the elasticity of the tension member.

Bei einem Verfahren zum Betreiben eines Drukkers, dem bspw. Endlospapier mittels eines antreibbaren Einzugskopfes über eine Zuführbahn in eine mit dem mindestens einem Druckkopf ausgestatteten Durchlaufbahn des Druckers führbar und abtrennbar ist sollen zu beschriftende Papierbahnen schnell und einfach gewechselt werden können wobei die exakte Beschriftung ebenso zu sichern ist wie das exakte Abtrennen. Dazu wird vorgeschlagen, beim Wechseln der Papierquelle nach dem Abtrennen des letzten ausgedruckten Papierabschnittes die eingeführte Papierbahn mit Ihrer Schneidkante bis zu einem Sensor zurückzuführen, beim Ansprechen des Sensors die Differenz aus der Sollbewegung des Antriebs und dem Istwert desselben zu bilden und abzuspeichern, die Papierbahn weiterhin in eine vorgegebene Parkposition zurückzuziehen und die für das weitere arbeiten des Druckers vorgesehene Papierbahn aus ihrer Parkposition vorzufahren, wobei der Sollwert jedes Sollschubs um die für diese Papierbahn gespeicherte Differenz zu korrigieren ist.

Apparatus and method for clogging prevention in computer printers where a tractor pair (2) pushes a multiple copy continuous form (11) towards a printing position along a path which causes a relative offsetting of the module copies, comprising counting means (26) for detecting that the form (11) has been fed forward of a first predetermined amount and control means responsive to such detection for controlling the tractor pair (2),first in order to feed back the form of another predetermined amount, lesser than the first amount, then in order to feed forward again the form of the same other amount, the control means then resetting the counting means.