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Image forming method and image forming apparatus

An image and equipment technology, applied in the field of image formation and image formation equipment, can solve the problems of difficulty in controlling the amount of ink discharge, difficulty in obtaining stable images, etc.

Inactive Publication Date: 2009-03-04
COPYER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, when the temperature of the print head reaches or exceeds a predetermined temperature (for example, as Figure 11 As shown, when the temperature of the print head reaches or exceeds 60°C), it is difficult to control the amount of ink discharged
This often presents the problem of difficult to obtain a stable image

Method used

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  • Image forming method and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0039] Referring to FIG. 1, an example of an image forming apparatus according to the present invention will be described.

[0040] FIG. 1 is a perspective view showing a schematic diagram of a line matrix printer as an example of an image forming apparatus according to the present invention.

[0041] A line printer (hereinafter referred to as "printer") 10 includes printing heads K1, K2, K3, and K4 that discharge ink into a plurality of labels 14 (constituting an example of printing media) on each label to form an image. The label 14 is temporarily adhered to the surface of the rolled board 12 . While forming an image, the print heads K1, K2, K3 and K4 remain stationary and never move. Black ink droplets are discharged from the respective print heads K1 to K4. Together with the plate 12 , the label 14 is conveyed at a constant speed in the direction of arrow A by conveying rollers 18 and 20 driven by a conveying motor 16 .

[0042] Ink discharge port arrays are formed in ...

no. 2 example

[0061] refer to Figure 4 , another example of the image forming method using the printer 10 having the aforementioned configuration will be described. Figure 4 is a flowchart showing a second embodiment of the image forming method according to the present invention. In this regard, as Figure 9A and 9B As shown, the basic assignment is that rasters 1, 2, 3 and 4 are associated with print heads K1, K2, K3 and K4, respectively.

[0062] Figure 4 The shown flow is a flow of an image forming method of the type that detects the number of dots to be ejected from the respective print heads K1 to K4 before forming an image on a printing medium (label 14 in this example), and based on the detected The basic allocation is changed by the number of dots to be ejected from the respective print heads K1 to K4. Specifically, the raster allocation is arbitrarily changed for each page. Assign the coldest printhead to the raster that needs to eject the greatest number of dots onto the p...

no. 3 example

[0068] refer to Figure 6 , a third embodiment of the present invention will be described.

[0069] Figure 6 is a flowchart showing a third embodiment of the image forming method according to the present invention. Apart from Figure 6The flow shown involves modifying the Figure 3A and 3B In addition to the steps obtained from the portion of the flowchart shown, Figure 6 The process shown and Figure 3A and 3B The flow shown is the same. exist Figure 6 Marked with a dotted line in the modified Figure 3A and 3B The steps obtained from the portion of the flowchart shown. Due to the process before and after the steps obtained by modifying the same Figure 3A and 3B The procedure shown is the same as in Figure 6 This part of the process is omitted. Steps S601 and S602 are added to Figure 3A and 3B The procedure shown in this constitutes Figure 6 process shown in .

[0070] In the first embodiment, only whether the highest temperature among the temperatur...

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Abstract

The invention provides an image forming method which prevents the temperatures of printing heads from exceeding a predetermined temperature. In this image forming method, its basic assignment is changed when any one of the temperatures detected by the respective temperature sensors (61 to 64) exceeds the predetermined temperature (for example, 60 DEG C). Specifically, each time the forming of an image on a printing medium (for example, a label) is completed, the temperatures of the respective printing heads (K1 to K4) are detected with the respective temperature sensors. When any one of the temperatures thus detected exceeds 60 DEG C, the association of raster line regions with ink ejection opening arrays (N1 to N4) (the association of rasters with the printing heads) under the basic assignment is shifted one-by-one.

Description

technical field [0001] The present invention relates to an image forming method and an image forming apparatus that form an image on a printing medium by discharging ink onto the printing medium. Background technique [0002] Dry electrophotographic printers have heretofore been used to print business forms and the like. In recent years, instead of dry electrophotographic printers, inkjet printers (inkjet image forming apparatuses) have come to be used. An inkjet image forming apparatus forms an image on a printing medium by discharging ink droplets onto the printing medium from a plurality of ink discharge openings (nozzle openings) formed in a print head thereof. One of the known ink droplet discharge techniques is to discharge ink droplets from a nozzle using bubbles formed in ink in the nozzle by film boiling by supplying ink with heat energy dependent on a driving pulse. Thereby, a plurality of ink droplets depending on the image to be generated are discharged from th...

Claims

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Application Information

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IPC IPC(8): B41J2/05B41J29/393
Inventor 黑田茂夫
Owner COPYER
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