JPH02155774A - Recording apparatus - Google Patents

Abstract

PURPOSE:To enable execution of recording without a print blank by a construction where in a couple of rollers each comprising a capstan roller and a pinch roller are disposed on the opposite sides of a platen. CONSTITUTION:The fore end of paper 4 is inserted between a capstan roller 6 and a pinch roller 7 from a manual insertion stage 5 and fed between a capstan roller 9 and a pinch roller 10 by the driving force of a couple of rollers A. When the rear end of the paper 4 comes to the pressure contact point of a recording head 2 and a platen 1, both couples A and B of rollers stop. The recording head 2 is pressed on the platen 1 in this state, and the paper 4 is fed in the direction reverse to that of feeding in and printed. When the fore end of the paper is fed in between the capstan roller 6 and the pinch roller 7, it is detected by a sensor 17 and the drive of the platen 1 is stopped. When the rear end of the paper gets out of the couple of roller B, the paper 4 is conveyed only by the roller couple A and printing is performed until no print blank is left in the rear end part of the paper.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermal transfer type or an electric transfer type recording device, and particularly to a recording device characterized by a paper conveyance system.

[Conventional technology]

This type of recording device is configured such that a pair of rollers consisting of a capstan roller and a pinch roller transports paper to a platen section, and information from the recording head is printed on the paper via an ink sheet at this platen position. ing.

[Problem to be solved by the invention]

Conveyance using capstan rollers and pinch rollers can increase the grip force on the paper, so it can be said to be an excellent mechanism that does not cause misalignment due to skew or the like. However, when conveying the paper with a pair of rollers, the paper must be held between them at all times, so there is always a printing margin that is the length between the capstan roller and the platen, which is the printing section. Therefore, there was a problem that the amount of information printed on the paper was reduced.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the above-mentioned prior art and to provide a recording apparatus having a conveyance system that does not produce printing margins for each paper number.

[Means to solve the problem]

In order to achieve this object, the present invention has developed a thermal transfer type or energized type in which an ink sheet and a sheet of paper, which is sandwiched and conveyed by a capstan roller and a pinch roller, are brought into pressure contact between a platen and a recording head, and the recording head prints on the paper. In a transfer type recording device, at the start and end of printing on a sheet of paper, a pair of rollers consisting of at least a capstan roller and a pinch roller hold and transport the sheet of paper. It is characterized by the arrangement of a roller pair consisting of a stun roller and a pinch roller.

[Effect]

As described above, in the present invention, roller pairs consisting of a capstan roller and a pinch roller are provided on both sides of the platen (upstream and downstream sides of paper transport), and during printing operation,
The pair of rollers on the upstream side in the conveying direction during printing feeds the paper toward the platen section, and after the printing start end of the paper reaches the pair of rollers on the downstream side in the conveying direction during printing, the pair of rollers on the downstream side and the upstream side The paper is conveyed by both roller pairs. Furthermore, after the end of printing leaves the pair of rollers on the upstream side in the conveying direction during printing,
During printing, the paper is transported by a pair of rollers on the downstream side in the transport direction, and printing is performed up to the edge of the paper.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The figure is a schematic diagram of a recording device according to an embodiment of the present invention.

In the figure, ■ is a platen, and 2 is a recording head (current-carrying head). Information from the recording head 2 is printed on the paper 4 by pressure contact between the two through the ink sheet 3 and the paper 4. It has become. The paper 4 is placed on the manual feed tray 5, and guided by a guide plate 8 by a pair of rollers A consisting of a capstan roller 6 and a pinch roller 7, and is fed toward the platen 1, and is also fed to the opposite side across the platen 1. As will be described later, a roller pair B consisting of a capstan roller 9 and a pinch roller 1O provided on
It is designed to be sent backwards while being guided by 1.

On the other hand, the ink sheet 3 is connected to the supply roll 12 and the take-up roll/
1z13, stretched around tension rollers 14°15, and set between the recording head 2 and platen l. The ink sheet 3 is in the form of a cassette, and the recording head 2 and the return electrode 16 are retracted together so that it can be taken out in the direction of the manual feed table 5.

Next, the operation will be explained.

In the initial state, the recording head 2 and the return electrode 16 are separated from the platen 1 at the position indicated by the broken line.

First, the leading edge of the paper 4 is inserted from the manual feed tray 5 between the capstan roller 6 and the pinch roller 7, and is passed between the recording head 2 and the platen l by the driving force of the roller pair A.
The paper 4 is fed between the capstan roller 9 and the pinch roller 10, and then further fed. When the trailing edge of the paper 4 comes to the pressure contact point between the recording head 2 and the platen l, both roller pairs A and B
stops. In this state, the recording head 2 is pressed against the platen 1 via the ink sheet 3 and paper 4. Then, the paper 4 is fed by the driving force of the platen 1 and roller pair B in the opposite direction to the direction in which it was fed, and is printed. At this time,
The platen 1 is driven via a torque limiter, and the conveyance speed of the paper 4 by the platen 1 is set to be faster than the conveyance speed of the roller pair B. However, since the platen 1 is driven via the torque limiter, there is no tension on the paper 4. while giving
It rotates at the same conveyance speed as roller pair B while slipping. Then, when the leading edge of the paper in the printing conveyance direction (leftward in the figure) is sent between the capstan roller 6 and the pinch roller 7, it is detected by the sensor 17, and the drive of the platen 1 is stopped. After that, paper 4 is roller pair A.
When the trailing edge of the sheet 4 in the conveyance direction during printing is removed from the roller pair B, the sheet 4 is conveyed only by the roller pair A, and printing is performed until there is no printing margin left at the trailing edge of the sheet.

In the case of color printing, the recording head 2 leaves the platen 1 again, the paper 4 is conveyed in the opposite direction, the color of the ink sheet 3 changes, and the same printing operation as for the first color is repeated. Then, the three colors Y, M, and C are transferred, color printing is completed, and the paper 4 is discharged in the direction of the manual feed table 5.

Note that in thermal transfer type and electrical transfer type recording apparatuses, the feeding of the paper 4 is assisted by feeding the ink sheet 3.

〔Effect of the invention〕

As explained above, according to the present invention, roller pairs are provided on both sides of the platen at an interval narrower than the paper length, so that at least one roller pair pinches and conveys the paper during printing. Therefore, it is possible to record without printing margins.

[Brief explanation of the drawing]

The figure is a schematic configuration diagram of a recording apparatus according to an embodiment of the present invention. 1...Platen, 2...Recording head, 3...Ink sheet, 4...Paper, 6, 9...Capstan roller, 7.10...Pinch roller, A, B...・Laura vs.

Claims (1)

[Claims] In a thermal transfer type or electric transfer type recording device, an ink sheet and a paper sandwiched and conveyed by a capstan roller and a pinch roller are pressed together by a platen and a recording head, and the recording head prints on the paper. At the start and end of printing, a pair of rollers each consisting of a capstan roller and a pinch roller are placed on both sides of the platen so that the paper is conveyed while being held between at least a pair of rollers consisting of a capstan roller and a pinch roller. A recording device characterized in that a.