JPH0526430U - Inkjet printer - Google Patents

Abstract

(57) [Abstract] [Purpose] The unprinted unprinted paper is sandwiched between the printed paper that has been printed to prevent the printed paper from becoming dirty and improve the quality of the printed paper. To improve the performance of the device. [Structure] A hopper 1 for storing printing paper, printing means 15 and 25 for ejecting and printing mist-like ink on the printing paper stored in the hopper 1, and the printing means 1.
In an ink jet printer having a stacker 19 for storing printed sheets printed by 5, 25, detection means for detecting the end of printing of the printing sheets printed by the printing means 15, 25, and 13, 25. When the end of printing is detected by the detecting means 13 and 25, a conveying means and 21 and 23 for conveying the print sheets stored in the hopper to the stacker are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hopper that stores printing paper, a printing means that ejects mist-like ink onto the printing paper that is stored in the hopper to print, and a printed paper that is printed by this printing means. In particular, the present invention relates to an ink jet printer that includes a stacker that stores therein and that improves the quality of printed paper by preventing the printed paper from being soiled.

[0002]

[Prior Art]

 In recent years, inkjet printers, which produce almost no noise during printing, have been used in word processors and the like. The inkjet printer described above prints the printing paper one by one from a hopper that stores the printing paper, ejects mist-like ink from a large number of minute nozzles, and prints the printing data on the printing paper. Discharge to stacker. After discharging to the stacker, the inkjet printer again feeds one sheet of printing paper from the hopper and discharges the printed paper on which the printing data is printed by the fine nozzles to the stacker. Printed sheets are stacked on the stacker and stored. The ink jet printer prints the print data sent from the host computer by repeating the above print processing on the print paper, but the next print paper is stored in the stacker on the back side of the print paper. , It was not easy to prevent the printed paper from getting dirty.

[0003]

[Problems to be solved by the device]

 By the way, the conventional ink jet printer stores the next printed paper so that the printed paper is superposed on the stacker, so that the next printed paper is superposed on the back side of the printed paper. There is a problem that the ink of the next printed paper adheres to the back surface of the paper and stains the back surface of the printed paper, resulting in deterioration of the quality of the printed paper.

The present invention has been made to solve such a conventional problem, and its object is to sandwich an unprinted sheet between printed sheets that have been printed. Accordingly, it is an object of the present invention to provide an inkjet printer that prevents the stain of the printed paper, improves the quality of the printed paper, and improves the performance of the apparatus.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a detection means for detecting the end of printing on a printing paper which is printed by a printing means for ejecting mist-like ink onto the printing paper stored in a hopper to print. When the end of printing is detected by the detection means, a transport means for transporting the printing paper stored in the hopper to the stacker for storing the printed printing paper is provided.

[0006]

[Action]

 According to the above-described configuration, the printing paper stored in the hopper is ejected with mist-like ink to print, and then the printing paper is stored in the stacker. When the completion of printing of the printed paper to be printed is detected, the printing paper stored in the hopper is conveyed to the stacker, so that the printed paper can be prevented from becoming dirty and the quality of the printed paper can be improved. ..

[0007]

【Example】

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

FIG. 1 is a block diagram showing an embodiment of an ink jet printer of the present invention.

In FIG. 1, a hopper 1 that constitutes an automatic paper feeding device accommodates a large number of unprinted printing papers 3 which are not printed yet by standing upright in the upper right direction in the drawing. A paper feed motor 5 arranged in the lower part of the hopper 1 in the figure drives a paper feed roller 7 to rotate in order to take out the printing papers 3 stored in the hopper 1 one by one.

A circular platen 9 is arranged at a substantially central portion of the lower end of the paper feed roller 5 in the figure. The platen 9 conveys the print paper 3 conveyed by the paper feed roller 7 to the print head 15 described later while winding the print paper 3.

A semicircular paper pan 11 arranged on the right side of the platen 9 in the figure guides the print paper 3 stored in the hopper 1 to a print head 15 described later. The paper detection switch 13 arranged at the lower end of the platen 9 in the figure detects the presence or absence of the print paper 3 guided by the paper pan 11. When the print paper 3 comes into contact with the print paper 3, a detection signal is sent to the print control described later. Output to the circuit 25.

The print head 15 disposed on the left side of the platen 9 in the figure has a large number of fine nozzles at the tip on the platen 9 side and is wound around the platen 9 from the nozzles. Printing is performed by ejecting mist-like ink onto the printing paper 3 and electrically controlling the flow of ink.

A paper discharge roller 17 disposed above the platen 9 in the figure conveys the printed paper printed by the print head 15 to the stacker 19. The stacker 19 for storing the printed papers conveyed by the paper discharge rollers 17 faces the hopper 1 and stands upright in the upper right direction in the figure. The stacker 19 stores the printed paper 3 conveyed from the paper discharge roller 17 while stacking them from the right side in the drawing.

The paper feed control circuit 21 connected to the paper feed motor 5 drives the paper feed motor 5 when receiving a print request signal from the print control circuit 25.

The paper feed control circuit 23 is connected to the platen 9 and the paper discharge roller 17, and controls the rotational drive of the platen 9 and the paper discharge roller 17 in conjunction with the paper feed motor 5.

The print control circuit 25 is connected to the print head 15 and the paper detection switch 13, and when a detection signal is input by the paper detection switch 13 and the presence of the print paper 3 is detected, a predetermined timing (the print paper 3 is printed) is detected. (When passing through the head 15), the fine nozzles of the print head 15 eject mist-like ink to control printing.

The data bus 27 is connected to the print control circuit 25 and the like, and serves as a data transmission / reception path.

The host computer 29 transmits print data and control commands via the interface 31.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

First, after powering on the apparatus, print data and control commands are transmitted from the host computer 29 via the interface 31 (step 100). When the print data and the like are transmitted, the print control circuit 25 drives the print head 15 onto the print sheet 3 conveyed from the hopper 1 to eject mist-like ink from the nozzles for printing. If a discharge command is received from the host computer 29 or the paper detection switch 13 detects that there is no paper (the end of the print paper 3) during the printing, the process proceeds to step 140. If the discharge command is not received or the paper is detected Returning to step 110, the printing process is continued (steps 110-130).

When the process proceeds to step 140, the print control circuit 25 interrupts the printing and outputs a paper discharge request to the paper feed control circuit 23 via the data bus 27. When the paper discharge request is output, the paper feed control circuit 23 drives the platen 9 and the paper discharge roller 17 to convey the printed paper printed by the print head 15 to the stacker 19. Further, the paper feed control circuit 23 outputs a paper feed request to the paper feed control circuit 21 via the data bus 27. When a paper feed request is input, the paper feed control circuit 21 drives the paper feed motor 5 and the paper feed roller 7 to convey the unprinted print paper 3 from the hopper 1 to the platen 9, and at the same time, the paper feed control circuit 21. A paper discharge request is output to 23. The paper feed control circuit 23 drives the platen 9 and the paper discharge roller 17, and conveys the print paper 3 to the stacker 19. The print control circuit 25 feeds paper when the detection signal is not input from the paper detection switch 13. A paper feed request is output to the circuit 21. When the print paper 3 is conveyed to the platen 9 by the paper feed control circuit 21, the print control circuit 25 outputs a drive signal to the print head 15 to restart printing (steps 140 to 190).

As a result, since the unprinted printing paper 3 is stored between the printed papers in the stacker 19, it is possible to prevent the ink from adhering to the back surface of the printed papers and print the printing papers 3 as in the conventional case. The quality of paper can be improved.

In the present embodiment, the case of one hopper 1 has been described. However, a plurality of hoppers 1 are provided and the function of the paper feed control circuit 21 is added so that a paper sandwiched between printed papers can be obtained. By storing paper used as printing paper in separate hoppers, the printing paper can be saved and maintenance costs can be reduced.

[0024]

[Effect of the device]

 As described above, according to the present invention, by sandwiching the unprinted paper between the printed papers that have been printed, the dirt of the printed paper is prevented and the quality of the printed paper is improved. It is possible to improve the performance of the device.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an inkjet printer of the present invention.

FIG. 2 is a flowchart showing the operation of the present invention.

[Explanation of symbols]

 1 Hopper 3 Printing Paper 5 Paper Feed Motor 9 Platen 13 Paper Detection Switch 15 Print Head 19 Stacker 21 Paper Feed Control Circuit 23 Paper Feed Control Circuit 25 Print Control Circuit

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location B41J 13/00 9210-2C 29/00 29/48 A 8804-2C

Claims (1)

[Scope of utility model registration request] 1. A hopper for storing printing paper, a printing means for ejecting mist-like ink onto the printing paper stored in the hopper for printing, and a printed paper printed by the printing means. In an ink jet printer having a stacker to be stored, a detection unit that detects the end of printing of a print sheet printed by the printing unit, and a print that is stored in the hopper when the end of printing is detected by the detection unit An inkjet printer, comprising: a transport unit that transports a sheet to the stacker.