Inkjet printer, printing method using the same, and automatic web threading method

An inkjet printer that carries out printing by an inkjet method with respect to a long Z-folded continuous paper provided with a perforation at every page break and provided with marginal punch holes in both sides, the inkjet printer comprising:

• a paper feeding unit that disposes the Z-folded continuous paper;
• a first pull roller and a second pull roller for conveying the continuous paper;
• a pin tractor for positioning the continuous paper;
• a speed-variable motor for applying a tension to the continuous paper;
• a printing unit that carries out printing on the continuous paper by a print head;
• back-tension rollers consisting of a plurality of rollers for guiding the continuous paper and, at the same time, applying the tension and
• a discharging unit that Z-folds and discharges the continuous paper by a folding machine;
• wherein
• the pin tractor has pins and can carry out positioning of the continuous paper by inserting the pins in the marginal punch holes;
• a first gripper roller for sandwiching the continuous paper abuts the first pull roller, and a driving motor is attached to the first pull roller;
• a second gripper roller for sandwiching the continuous paper abuts the second pull roller, and the speed-variable motor is attached to the second pull roller;
• the speed-variable motor applies the tension to the continuous paper by changing a rotating speed of the second pull roller;
• in the conveyance path of the continuous paper, the back-tension rollers are provided between the paper feeding unit and the pin tractor;
• the speed-variable motor is attached to at least one roller of the back-tension rollers;
• and
• the speed-variable motor applies the tension to the continuous paper by changing a rotating speed of the roller.

An inkjet printer that carries out printing by an inkjet method with respect to a long Z-folded continuous paper provided with a perforation at every page break and provided with marginal punch holes in both sides, the inkjet printer comprising:

• a paper feeding unit that disposes the Z-folded continuous paper;
• a first pull roller and a second pull roller for conveying the continuous paper;
• a pin tractor for positioning the continuous paper;
• a speed-variable motor for applying a tension to the continuous paper;
• a printing unit that carries out printing on the continuous paper by a print head;
• and
• a discharging unit that Z-folds and discharges the continuous paper by a folding machine;
• wherein
• the pin tractor has pins and can carry out positioning of the continuous paper by inserting the pins in the marginal punch holes;
• a first gripper roller for sandwiching the continuous paper abuts the first pull roller, and a driving motor is attached to the first pull roller;
• a second gripper roller for sandwiching the continuous paper abuts the second pull roller, and the speed-variable motor is attached to the second pull roller;
• the speed-variable motor applies the tension to the continuous paper by changing a rotating speed of the second pull roller;
• a pin-tractor encoder is attached to the pin tractor;
• and
• a reference detecting sensor for detecting a front end of the continuous paper is attached to a side opposed to the pin tractor via the continuous paper.

An inkjet printer that carries out printing by an inkjet method with respect to a long Z-folded continuous paper provided with a perforation at every page break and provided with marginal punch holes in both sides, the inkjet printer comprising:

• a paper feeding unit that disposes the Z-folded continuous paper;
• a first pull roller and a second pull roller for conveying the continuous paper;
• a pin tractor for positioning the continuous paper;
• a speed-variable motor for applying a tension to the continuous paper;
• a printing unit that carries out printing on the continuous paper by a print head;
• and
• a discharging unit that Z-folds and discharges the continuous paper by a folding machine;
• wherein
• the pin tractor has pins and can carry out positioning of the continuous paper by inserting the pins in the marginal punch holes;
• a first gripper roller for sandwiching the continuous paper abuts the first pull roller, and a driving motor is attached to the first pull roller;
• a second gripper roller for sandwiching the continuous paper abuts the second pull roller, and the speed-variable motor is attached to the second pull roller;
• the speed-variable motor applies the tension to the continuous paper by changing a rotating speed of the second pull roller;
• if a conveyance speed of the continuous paper is decelerated, recording is carried out by a resolution of a point immediately before the deceleration;
• and,
• if the conveyance speed of the continuous paper is accelerated, recording is carried out by a resolution of a point immediately after the acceleration.