JPS58188661A - Recording apparatus - Google Patents

Abstract

PURPOSE:To provide a recording apparatus preventing the generation of overlap or a gap during recording and capable of also enhancing resolving power, constituted by providing an angle variable mechanism enabled in the arbitrary adjustment of an angle with respect to the paper feeding direction of a recording head. CONSTITUTION:Each recording head 2 is positioned in a direction almost same to a paper sending direction and a paper sending amount is preliminrily set so as to generate overlaalp recording. Subsequently, an adjusting screw 25 is revolved corresponding to the overlap amount to incline the multi-nozzle of each recording head 2 only by a minute angle theta to carry out adjustment so as not to generate overlap recording. In this case, if a fixing screw 22 is loosened and the adjusting screw 25 is revolved, each recording head is parallelly moved until the optional angle theta while a parrallel degree is respectively held and, if the fixing screw 22 is again clamped, the multi-nozzle of the recording head 2 is directly fixed in the inclination of the angle theta.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device equipped with a recording head consisting of a plurality of recording elements, and is particularly suitable for a recording device 1 such as a multi-nozzle inkjet printer, a transfer type thermal printer, or a wire dot printer. .

In conventional recording devices such as multi-nozzle inkjet printers and transfer-type thermal printers, a large number of recording elements 1, such as multi-nozzles, are arranged at predetermined intervals in the paper feeding direction Y of the recording paper I as shown in the figure. He had a record head and was recording his painting salary. However, in such a conventional recording device, since the paper is fed by a paper feed motor such as a DC servo motor or a stepping motor via the paper feed 90-ra, a radial transmission mechanism of one paper feed roller is required. Due to dimensional errors such as the pulley diameter, errors may occur in the paper feed amount, resulting in overlapping recording between the first printing area L/ and the ＠th printing area, or 11 being opened. An inconvenience arose. Such errors in the paper feed position can be corrected by increasing or decreasing the number of pulses of the stepping motor or the number of pulse counts of the pulse generator (rotary encoder).
Since the minimum feed amount of the paper feed roller, that is, the unit rotation amount of the roller, is determined by the step angle of the stepping motor or the pulse aK per rotation of the rotary encoder, the feeding device cannot be modified below this value. It has not been possible to sufficiently prevent the occurrence of overlapping gaps as described above. Furthermore, in such a printing device.

Since the angle at which the recording head is arranged relative to the recording paper/l is fixed, it is not possible to increase the dot density depending on the type of printing to improve the resolution.

The present invention has been made in view of the above points.

It is an object of the present invention to provide a recording device which is provided with an angle variable mechanism for adjusting the arrangement angle of the recording head with respect to the paper feeding direction, thereby preventing overlapping recording and recording gaps, and increasing the degree of clearing. purpose.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 shows an example of the configuration of a multi-nozzle inkjet color printer according to the present invention, where 3 indicates recording paper l.
a paper feed roller, 4I, which moves the paper in the arrow Y-axis direction (c, sub-scanning direction), and a paper feed pulse generator, which drives the paper feed roller 3 via the pulley 4, 7 and t. 1 is a paper guide roller that forms the recording plane of the recording paper 1, 2 is a carriage on which the head unit IO is mounted, and the carriage is driven by a head feeding pulse motor saw via It reciprocates along the rail /J in the arrow X-axis direction c (main scanning direction). /Da is the ink supply pipe! These are ink tanks for different colors that supply yellow, magenta, cyan, and black ink to a plurality of recording heads in the head unit (head unit) 10,
Reference numeral 11 denotes a 7-lexiple printed wiring board that supplies drive pulses to each nozzle of the recording head.

Fig. 3 shows an example of the configuration of the head unit (io) shown in Fig. 1, where l is the L-shaped holder installed on the carriage 9, and n is the head unit sliding with the L-shaped groove n of the boulder. -4 is an identification plate that stands upright on the open end of the holder and adjusts the horizontal (main scanning direction) KvA; a tilt adjustment screw that screws onto the end face of the adjustment plate to adjust the horizontal position of the adjustment plate;
26 is wound around the outer periphery of the mu screw (holder 2/f)
The spring that comes into contact with the L-shaped sword and the end face of the III plate n to urge the IIJI plate 1 in the direction of the fixed plate body, the core is a long groove (not shown) formed at the end of the adjustment plate in the main scanning direction. ) is a fixing screw that passes through the adjustment plate and fastens the fixed plate.

X is a head substrate that supports the recording head at an arbitrary minute angle with respect to the sub-scanning direction (direction of arrow Y);
Square groove 2 formed on the horizontal upper surface of ? and a square groove 30 formed on the lower surface of adjustment plate 2 facing it, and are fixed by being biased horizontally and vertically by springs 33 and 31 via steel balls 31 and 3.

At this time, one spring 33 urges the legs of the head board in the horizontal direction to press the board against one side wall surface of the square grooves 2t and 30, and the other spring 33 applies force to the head board through the steel balls 32. Since the substrate X is seated on the bottom of the square groove by forcing the inclined head of the head in the vertical direction, the head substrate X is held in a predetermined position. 3S is a stopper for the spring 33.

Each of the recording heads described above, which is provided independently for each ink color, is a multi-nozzle inkjet head having a plurality of nozzles arranged in a straight line in the longitudinal direction at an interval (pitch) of, for example, one nozzle. It is actuated by a drive pulse through each flexible printed wiring board/6 (see FIG. 2) to eject wrinkle-matching color ink toward the recording paper/. This ink is ejected by, for example, a bubble jet method in which a heating element is embedded in a nozzle and ink droplets are ejected using bubbles that generate heat in response to pressure pulses.

In addition, as shown in the figure, the recording heads are arranged side by side at equal intervals in the main scanning direction via the head substrate, and by adjusting the adjustment screws, the arrangement angles with respect to the paper feeding direction are set at the same angle. It will slow down if you adjust it arbitrarily.

That is, IIIJ11Q2 can be moved horizontally by loosening the fixing screw and moving the adjusting screw, and since each head board X has the same length and is arranged side by side at equal intervals, the adjusting plate The head substrate X and the main body L constitute a horizontal tilting mechanism as an angle variable means. Therefore, the arrangement direction of the nozzles of each recording head attached to the side of each head board is determined by the head unit).
The above-mentioned angle variable means 10 allows the recording paper 70 to be tilted at any slight angle with respect to the paper feeding direction.

Next, the present invention will be explained in detail with reference to FIGS.

First, each recording head is positioned in substantially the same direction as the paper feeding direction, and the paper feeding amount is set in advance so that overlapping printing occurs as shown in the first diagram. Next, according to the amount of overlap, the adjustment screw is rotated to tilt the multi-nozzle of each recording head by a minute angle, thereby making adjustments so as not to cause overlapping recording, as shown in Figure V.

At this time, if you loosen the fixing screw 2 and turn the adjusting screw j,
Each recording head moves in parallel to an arbitrary angle θ while maintaining its parallelism, and by tightening the fixing screw n again, the multi-nozzle of the recording head is fixed at an angle IO inclination t. At this time, if the length of the multi-nozzle in the longitudinal direction is calculated and the initial overlap amount is 1, then the overlap will be erased by tilting the recording head by an angle θ derived from the following equation (1).

Since there is a correlation between the angle fI and the feed amount of the adjusting screw, by knowing the overlap amount 1, it is possible to determine the feed amount of the seconds adjusting screw meter and eliminate the overlap. As described above, according to the present embodiment, the angle variable mechanism of the head unit 10 is adjusted to adjust the arrangement angle of the recording head (multi-nozzle) with respect to the paper feeding direction. Arbitrary from #c
Since this can be finely adjusted, the occurrence of overlaps and gaps can be sufficiently prevented, and the quality can be improved.

Furthermore, as the above-mentioned angle θ is enlarged, the recording density in the brain scanning direction improves, so according to the present embodiment, the dot density is increased depending on the type of printing, for example, when printing Kanji characters to improve the degree of disintegration. You can make it better.

As explained above, #c1 According to the present invention, since a variable angle mechanism is provided that can arbitrarily adjust the angle of the recording head with respect to the paper feeding direction, it is possible to prevent overlaps and gaps during recording, and also You can also improve your enjoyment.

In this embodiment, the recording heads are arranged side by side in the main scanning direction, but it goes without saying that the present invention is also suitable when the recording heads are arranged side by side in the sub-scanning direction.

[Brief explanation of drawings]

FIG. 7 is an operation explanatory diagram showing the overlap recording state,
The figure is a perspective view showing a configuration example of the recording apparatus of the present invention, FIG. 3 is a partially cutaway front view showing the head unit) 10 of 41 [Ell of FIG. 2, and FIG. FIG. 3 is an operation explanatory diagram showing a recording state. l・-Recording paper, K・-Recording head (multi-nozzle), 3...Paper feed roller, G...Paper feed pulse motor, j...Belt 6...Pulley. 7 and l-・Paper guide roller, ri...carriage, 10-・head unit. l/-timing belt, /co-head sending pulse motor, 13... guide rail, /4c... ink tank,
/S... Ink supply pipe, No. 7 - Flexible printed wiring board. K/・L-shaped holder, −・−・Inclination adjustment plate, evaluation/constant plate, J…Inclination adjustment screw, M・−Spring, Core…Fixing screw. Co...head board, 29 and X...square groove, J/ and 3 steel balls, 33 and 3Q...spring. 3S...-Stopper. Patent applicant Canon Co., Ltd.\, / '2 \-・' Figure 3/

Claims (1)

[Scope of Claims] 1) A recording device (i) equipped with a recording head made up of a plurality of recording elements, including an angle variable mechanism capable of tilting the arrangement direction of the recording elements with respect to the recording medium feeding direction. A recording device characterized by: 2. The recording apparatus according to claim 1, which includes a plurality of recording heads, and the angle variable mechanism is configured to tilt the plurality of recording heads while maintaining mutual parallelism. A recording device characterized by