JPH02292047A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To enable recording-liquid to be discharged uniformly from all nozzles provided to a recording head by a method wherein a carriage mounting a recording having a nozzle line to which a plurality of nozzles are disposed in an array is, in a reciprocating free manner, arranged to a guide bar fitted aslant to a carrying direction of recording paper. CONSTITUTION:A carriage 6 on which a bubble jet head (BJ head) 7 having a nozzle line 8 of a length (a) composed of a plurarity of bubbles is mounted is, in a reciprocating free manner, arranged in the arrow x direction on a guide bar 5 fitted aslant to a carrying direction y of recording paper 1. The carriage 6 is reciprocated in the arrow x direction on the guide bar 5 by transmitting motive power of a driving source via a belt 2 disposed in tension between a timing pulley 3 which is connected to the driving source and a timing pulley 4. The BJ head 7 mounted on the carriage 6 discharges recording liquid while it scans aslant on the recording paper 1 to be carried in a carrying direction y to form an image on the recording paper 1. Use frequency of each nozzle is made equal and of the nozzle is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet recording apparatus that performs recording by ejecting recording liquid.

[Conventional technology]

In conventional inkjet recording devices, when printing individual print patterns such as characters and codes, a recording head equipped with a nozzle array consisting of a plurality of nozzles is rotated in the direction y of conveying the recording paper 1, as shown in FIG. Recording is performed row by row by operating in the right angle direction 2, and in this case, the height b of the individual print pattern is smaller than the nozzle row length a of the recording head. Therefore, unused nozzle parts c and d will occur in the recording head, but if a nozzle becomes unused for a certain period of time (usually several seconds) or more during the recording operation of an image including individual print patterns, the nozzle In order to prevent clogging, all nozzles were used for discharging.

(Problems to be Solved by the Invention) However, the conventional inkjet recording apparatus described above has the following drawbacks.

(1) Normally, the length of the nozzle row of the recording head is greater than the height b of the individual print pattern, so there is a high probability that unused nozzles will occur and the print throughput will decrease.

(2) If unused nozzles are found, ejection is performed using all nozzles to prevent nozzle clogging, which wastes recording liquid and is not economical.

(3) The temperature of the recording head partially increases, causing deterioration.

The present invention has been made in view of the above-mentioned drawbacks of the conventional technology, and an object of the present invention is to provide an inkjet recording apparatus in which recording liquid is ejected evenly from all nozzles provided in a recording head.

[Means to solve the problem]

In the inkjet recording apparatus of the present invention, a carriage equipped with a recording head having a nozzle row in which a plurality of nozzles are arranged is reciprocally disposed on a guide bar attached obliquely to the conveyance direction of recording paper. There is.

(Function) A carriage carrying a recording head having a nozzle row in which a plurality of nozzles are arranged in parallel reciprocates on a guide bar attached obliquely to the conveyance direction of recording paper. The recording head diagonally scans the recording paper 7 by reciprocating the carriage, and when printing individual print pattern rows such as characters and codes consisting of multiple lines, the recording head scans the recording paper 7 diagonally. Individual print pattern rows are printed partially. At this time, on the passing line of each nozzle provided in the nozzle row on the recording head, there is a printed portion at least once,
In one scan, recording liquid is ejected from each nozzle at least once.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a recording mechanism of a bubble jet recording apparatus which is an embodiment of the present invention. This bubble jet recording device has a nozzle array 8 of a shape a consisting of a plurality of bubbles.
A carriage 6 on which a bubble jet head (hereinafter referred to as a BJ head) 7 is mounted is arranged so as to be able to reciprocate in the direction of arrow X on a guide bar 5 mounted obliquely to the conveying direction y of the recording paper 1. ing. This carriage 6 is connected to a timing boolean connected to a drive source (not shown).
The power of the drive source is transmitted through the belt 2 stretched between the timing boley 4 and the guide bar 5, and the arrow
Move back and forth in the direction. As the carriage 6 reciprocates on the guide bar 5, the BJ head 7 mounted on the carriage 6 discharges recording liquid and records while diagonally scanning the recording paper 1 conveyed in the conveyance direction y. An image is formed on paper 1.

Next, as shown in FIG. 2, the characters "", "B", "C", . The case where "D" is printed on the recording paper 1 will be explained.

First, in the first scan, the upper part of the character "0" in the first row is printed, but since there is no other printing part here, the nozzle row 8 passes over the upper part of the character "D" in the l-th row. Nozzles that are not used are unused.

Next, in the second scan, the upper part of the character "C" and the entire character "D" in the first line are printed. Therefore, here, the character strings existing in the first and second lines are partially printed over the two lines. Furthermore, in this second scan, there is one or more printed portions on the line through which each nozzle in the nozzle array 8 passes, and there are no unused nozzles.

Next, the third scan! The entire character "A゜" in the first line and the lower edge of the character "``, the upper part of the second line character "A'', the entire character "B" and the part excluding the upper edge of the character "C',
The upper part of the character "addition" on the third line is printed. Therefore, 2Here, the character string existing in those lines is partially printed over 31-t of the 1st to 3rd lines [1, and this third This means that all the character strings in the first line have been printed.Furthermore, as in the case of the second scan, there are no unused nozzles.

Then, for the fourth and subsequent scans, by scanning the recording paper l diagonally in the same way as the second or third scan, printing will be performed over multiple lines in one scan. 1 on the line that each nozzle passes through
There are no unused nozzles in which there are more than one printed portion.

In this way, each nozzle provided in the nozzle row 8 prints characters and character strings sequentially by partially printing over multiple lines in each scan after the second scan except for the first scan. There is a printed portion at least once in the passing line. Therefore, each nozzle ejects the recording liquid more than once in one scan, and no nozzle remains unused for more than a few seconds.

〔Effect of the invention〕

As explained above, in the present invention, the recording head scans the recording paper diagonally to record images including individual print patterns such as characters and codes, so that the average frequency of use of the nozzles arranged in parallel with the recording head is and eliminates nozzle clogging. Furthermore, by eliminating clogging of the nozzle nozzles, it is possible to prevent a local temperature rise in the nozzle array, prevent deterioration of the recording head, and improve the reliability of the recording operation. Furthermore, there are no unused nozzles that do not eject recording liquid, and it is no longer necessary to use all the nozzles to eject recording liquid at regular intervals, which eliminates waste of recording liquid and is economically advantageous.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a recording mechanism of a bubble jet printer which is an embodiment of the present invention, FIG. 2 is a plan view showing a recording paper 1 during a recording operation, and FIG. 3 is a plan view showing a conventional example. be. ! ...... Recording paper, 2...
...Belt, 3.4...Timing booley 5...Guide bar 6...Carriage, 7 -------
-...8J head, 8... Nozzle row. Patent applicant Canon Inc.

Claims (1)

[Claims] 1. A carriage (6) on which a recording head (7) having a nozzle row (8) in which a plurality of nozzles are arranged in parallel is mounted on a guide bar (5) attached obliquely to the conveying direction of the recording paper (1). ) is installed so that it can move back and forth.