JPS62201277A - Perfecting printer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a double-sided printing printer that prints on both sides of a sheet of paper for one print head.

[Conventional technology]

FIG. 3 shows a conventional example of a double-sided printing printer. In the figure, 60 is a recording paper, 61 is a feed roller that feeds the recording paper 60, 32, 33 are conveyance rollers that convey the recording paper 60, 34, 35, 36, 37 are reversible registration rollers, 38 69-46 are rotating drums provided to reverse the recording sent from the registration rollers 36 and 37; 69-46 are paper press rollers disposed at approximately equal intervals in contact with the outer peripheral surface of the rotating drum 38; 44-46; 52 are fixed conveyance guides for smooth conveyance of the recording paper 60, respectively.

Reference numeral 56 denotes an arc-shaped movable conveyance guide attached along the outer periphery of the rotating drum 68. When the guide is closed at the solid line position on the side of the drum 38, the recording paper 60 is transferred to the registration rollers 36, 3.
7, and on the other hand, the recording paper 60 is guided to a single-sided paper discharge tray 54 by opening it to the position shown by the broken line. 55 is a double-sided paper discharge tray that accommodates 3 degrees of double-sided recording paper. Reference numeral 56 denotes a fixed separator that is interposed between the rotary drum 38 and the registration rollers 36, 37 and conveys the recording paper 60 counterclockwise. Reference numeral 57 denotes a switching finger, which is interposed between the registration rollers 34, 35 and the conveyance rollers 32, 33, and switches the conveyance path according to the moving direction of the recording paper 60.
Moving the switching claw 57 to the solid line position guides the rising recording paper 30 to the registration rollers 34 and 35, while moving the switching claw 57 to the broken line position guides the descending recording paper 30 from the registration rollers 34 and 35 for double-sided discharge. The recording head 58 is a recording head such as an inkjet recording head or a thermal recording head.The recording heads 58 are arranged in a full line in a direction substantially perpendicular to the conveying direction of the recording paper 60, for example. It is a so-called multi-head.5
9 is a suction fan, and 60 is a porous guide plate. The suction fan 59 sucks the recording paper 60 onto the guide plate 60 to maintain the flatness of the recording paper 60 and optimize the distance between the recording paper 30 and the recording head 58. keep. 61 is a light emitting element of a photocoupler that detects the leading edge of the recording paper 30, and 62 is a light receiving element of the same photocoupler.The photocouplers 61 and 62 are provided close to the registration roller 3<S, 37.

[Problem that the invention seeks to solve]

Conventional double-sided printing printers have registration rollers of 34.35
Rotating drum 38. While conveying the recording paper 30 using the registration rollers 269 to 46, printing is performed from the upper part of the first side of the recording paper 60, and after completing the printing on the seventh side, the registration roller 69
~43. Since the recording paper 30 is conveyed by the rotating drum 68 until its leading edge reaches the printing position, and then printing is performed from the bottom of the second side while continuing to convey the recording paper 30, the recording head If a matrix printing element is used as 58, 18
There was a problem in that a character pattern that was reversed by 0 degrees was printed.

[Means for solving problems]

The purpose of this invention is to enable double-sided printing using a matrix printing element. horizontal writing is performed by the printing means in a direction perpendicular to the paper, and after the printing on one side is completed, the paper is reversed by the paper reversing means and fed to the paper conveying means, and the same horizontal writing is printed on the other side by the printing means. I try to do it.

〔Example〕

FIG. 1 shows an embodiment of the invention. In the figure, 1 is a platen, 2 and 3 are feed rollers provided in contact with the lower part of the platen 1, and 4 is a paper guide. These 1 to 4 constitute a paper transport means F that transports the paper while holding it. ing.

P is a printing device that performs horizontal printing on the paper held by the paper conveying device F in a direction perpendicular to the platen, using a printing hammer 5 and a daisy wheel (matrix printing elements arranged in an annular shape) 6. As shown in FIG. 2, the printing hammer 5 strikes the element of the Dizzee Hoi/I/6 that coincides with the platen axis. A paper sensor 7 is attached to the print head 5 and detects the leading edge of the paper conveyed by the paper conveyance means F, and a paper sensor 8 is provided in contact with the upper part of the platen 1 to detect the paper conveyed by the paper conveyance means F. This is a pail roller that supplies the stacker roller 1o via the paper table 9. The stacker roller 10 is a platen 1.
is driven via the belt 11. Reference numeral I denotes a paper reversing means for reversing the paper and supplying it to the paper transport means F after one-sided printing is completed, and is rotated to positions A, B, and C by a paper plate 12 and a step motor 13. 14
is paper bread.

Next, the effect will be explained.

The paper plate 12 is waiting at position l in a state where paper can be placed thereon.

If paper is placed with the side to be printed facing down on the paper plate 12 in this state, the paper will be driven in the direction of the platen 1 because the paper plate 12 is tilted, and the leading edge of the paper will come into contact with the paper table 9. and stay there. Then, when a paper set switch (not shown) is turned on, the paper plate 12 is rotated counterclockwise by the step motor 13 and stopped at position B. When the paper plate 12 stops, the paper falls naturally and is fed between the platen 1 and the feed roller 2. The paper is conveyed by B until the paper sensor 6 detects the leading edge of the paper, and the paper waits at the detected position in preparation for printing.

Horizontal printing is carried out by rotating the Digifoil 6 based on the print data, hitting the element with the printing hammer 5, and rotating the platen 1 clockwise in FIG. 1 by the character pitch every time one character pattern is stamped. When printing for one line is completed, the printing means P is moved to the left in FIG. 2 by the line pitch, and at the same time, the platen 1 is rotated counterclockwise in FIG. It is fed to the printing start position.

When printing of the last line is completed, the drive of the platen 1 is switched from intermittent drive to continuous drive, and the sheets are conveyed to the paper plate 12 by the sheet conveying means F, the starter, and the rollers 10, and are sequentially stored.

When the paper plate 12 is completely accommodated, the paper plate 12 is rotated counterclockwise in FIG. 1 by the step motor 16, and as the paper plate 12 rotates, the paper begins to fall toward the platen 1. Then, when the paper plate 12 stops rotating at position B, the paper is transferred to the platen 1 in the same manner as above.
and feed roller 2, and is transported by platen 1 and feed rollers 2 and 6 until paper sensor 6 detects the leading edge of the paper, and at the detected position,
Wait for printing. This means that the paper is set upside down.

Subsequent printing is performed in the same manner as described above.

〔Effect of the invention〕

This invention is configured so that horizontal writing is similarly printed in a direction perpendicular to the platen axis on the reversed surface of a sheet of paper on which horizontal writing has been printed in a direction perpendicular to the platen axis.
The advantage is that double-sided printing can be performed using a matrix printing element.

[Brief explanation of drawings]

FIG. 1 is a side view of a main part showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of horizontal printing, and FIG. 6 is a side view of a main part showing a conventional example. In the figure, 1... platen, 2, 3... feed roller, 4... paper guide, 5... print head, 6... degree daisy wheel, 12... paper plate, 16... Step motor, F: paper transport means, P: printing means, I: paper reversing means.

Claims (1)

[Scope of Claims] A paper conveyance means which is composed of a platen and rollers and which conveys the paper while holding it; a printing means which performs horizontal writing printing on the paper held thereby in a direction perpendicular to the platen axis; After single-sided printing,
A double-sided printing printer comprising: a paper reversing means for reversing the paper and supplying the paper to the paper conveying means.