JPH0432679Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control device for preventing color shift caused by changes in the surrounding environment such as temperature and humidity in an electrostatic color plotter.

[Conventional technology]

FIG. 5 shows a schematic diagram of an electrostatic color plotter, in which a take-up roller 1, a drive roller 2, and a paper feed roller 3 are provided so as to be able to rotate forward or backward, and an electrostatic recording paper 4 is attached to these rollers so that the electrostatic recording paper 4 can be rotated freely. is attached to. A cyan developer 5, a magiender developer 6, a black developer 7, and a yellow developer 8 are arranged on the side of the drive roller 2 and paper feed roller 3, and they each contain a cyan toner liquid 9, a magienda toner liquid 10, and a black developer. A developer is supplied from toner liquid 11 and yellow toner liquid 12. Further, a writing head 13 and a mark reading sensor 14 are provided on the paper feed roller 3 side.

Conventionally, in the electrostatic color plotter described above, a registration mark is first plotted as a reference for matching colors, and then, using this as a reference, an electrostatic latent image for each color is printed on electrostatic recording paper using a writing head 13. 4, and overwriting is performed using passes for each color: black, cyan, magenta, and yellow, or cyan, magenta, and yellow. For example, if you want to plot out + in a horizontal line for each color as shown in Figure 1f with 5-pass overwriting, when a command specifying the plot length is received from the host side, as shown in Figure 6a, Then, the registration marks 15 are plotted out at predetermined intervals on both sides of the electrostatic recording paper 4 for the length of the plot, and rewinding is automatically performed.Next, a black + is plotted, and rewinding is automatically performed again. The + of cyan, magenta, and yellow are similarly plotted using the registration mark 15 as a reference (c, d, e).

[Problem that the invention attempts to solve]

However, in the conventional method described above, when the electrostatic recording paper 4 expands and contracts under severe environmental conditions of high temperature and high humidity, the position of the registration mark 15 fluctuates. Even if the registration mark 15 is read and the plot position is corrected, there is a problem in that a color shift of several 100 μm occurs, as shown in FIG. 6c. Note that, as shown in FIGS. 6d to 6e, after the third pass, the recording paper adapts to the environment, so no color shift is observed.

In order to solve the above problem, JP-A-62-
In Publication No. 95548, the feed time is calculated based on humidity data, and color shift is prevented by performing the feed or rewind only once for the necessary time. In this method, under severe environmental conditions such as high temperature and high humidity, the feeding or rewinding time becomes longer, so sudden changes in temperature and humidity conditions may cause the part of the recording paper wound around the roller to It has the disadvantage that the recording paper expands and contracts, and this problem becomes particularly serious as the size of the recording paper increases.

The present invention solves the above problems, and provides a color shift prevention control device for an electrostatic color plotter that can prevent color shift even under severe environmental conditions such as temperature and humidity. With the goal.

[Means for solving problems]

To this end, the electrostatic color plotter color misregistration prevention control device of the present invention is equipped with a take-up roller, a drive roller, and a paper feed roller that can rotate forward or reverse in order to feed or rewind the electrostatic recording paper. In an electrostatic color plotter that plots each color by repeatedly feeding and rewinding the electrostatic recording paper, the electrostatic recording paper is fed and rewinded from a blank state based on temperature and humidity data from a temperature sensor and a humidity sensor. Calculating means for calculating the number of times to rewind, and before starting plotting each color, feed and rewind the electrostatic recording paper in a blank state for the number of times calculated by the calculating means to prevent color shift. Specifically, before plotting the registration marks, the electrostatic recording paper is fed and rewinded in a blank state, and then, for example, cyan, magenta, and yellow are plotted based on the registration marks. do.

[Effect]

In the present invention, for example, as shown in Fig. 1,
First, feed and rewind the electrostatic recording paper 4 as a blank sheet one to several times a to make the electrostatic recording paper 4 familiar with the environment. Plot out the registration marks 15 at predetermined intervals b, automatically rewind, then plot a black + c, automatically rewind again, and then repeat the same process using the registration marks 15 as a reference. cyan,
Majenda, plot yellow +d,
e, f, the + of each color is plotted out in a horizontal line, eliminating the occurrence of color shift.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a diagram for explaining the operation of the color misregistration prevention control device for an electrostatic color plotter according to the present invention, and Fig. 2 shows an embodiment of the color misregistration prevention control device for an electrostatic color plotter according to the present invention. Block diagram of the control system shown, Part 3
This figure is a flowchart showing one embodiment of the processing flow in FIG. 2, and FIG. 4 is a flowchart showing another embodiment of the processing flow in FIG. 2.

In FIG. 2, the control device 20 includes a CPU 21,
It includes a program storage circuit 22, a data storage circuit 23, and further includes a transfer control circuit 26, a print control circuit 27, a temperature sensor 28, a humidity sensor 29, and a keyboard 30 connected via a bus 24 and an I/O port 25. ing. Further, a host computer 31 is connected to the I/O port 25.

Next, the flow of processing in the control device 20 will be explained with reference to FIG. 3. After receiving a plot length designation command and plot length data, temperature and humidity are detected, and electrostatic recording is performed based on the temperature and humidity data. The number of times paper 4 is fed in a blank state is calculated. The number of feeds based on this temperature and humidity data is set in advance in the program storage circuit 2 as an empirical value that allows the electrostatic recording paper 4 to adapt to its environment.
It is stored in part of 2. Then, by rotating the take-up roller 1, drive roller 2, and paper feed roller 3 in the normal and reverse directions, feed and rewind are performed by the length of the plot until the number of feeds is reached. familiarize yourself with it.

After that, as with the conventional method, plot the registration mark for the length of the plot, rewind, request and incorporate image data in a predetermined color, plot out the data in a predetermined color, and rewind again. Thereafter, plotting out and rewinding of each color is executed in the same manner, and if it is determined in the step that plotting of all data has been completed, form feeding of the recording paper is performed.

FIG. 4 shows another embodiment of the processing method.
In the method of the above embodiment, the temperature,
The number of times the electrostatic recording paper 4 is fed in a blank state is calculated based on the humidity data, but in this embodiment, the number of times the electrostatic recording paper 4 is manually set by a switch is checked in step . It is something. Note that the electrostatic recording paper 4 may be fed only once in a blank state.

FIG. 1 shows how the control device prevents color shift from occurring on the electrostatic recording paper 4. First, feed and rewind the electrostatic recording paper 4 as a blank sheet one to several times a to make the electrostatic recording paper 4 familiar with the environment. Plot out the registration marks 15 at predetermined intervals b, automatically rewind, then plot a black + c, automatically rewind again, and then repeat the same process using the registration marks 15 as a reference. Cyan, Majenda,
d, e, f plotting yellow +. Therefore, as shown in f, the + of each color is plotted out in a horizontal line, eliminating the occurrence of color shift.

[Effect of idea]

As explained above, according to the present invention, the number of times the electrostatic recording paper is fed and rewinded is calculated based on the temperature and humidity data, and in order to feed and rewind the electrostatic recording paper this number of times, the temperature and humidity data are calculated. Even if sudden changes in conditions occur, the time the recording paper is stretched between the rollers increases, and even if the size of the recording paper increases, it can be prevented from expanding or contracting, and the electrostatic recording paper can be distributed evenly. It can adapt to the environment, and even under harsh environmental conditions of high temperature and high humidity, it is possible to prevent color shift caused by expansion and contraction of electrostatic recording paper.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining the operation of the color misregistration prevention control device for an electrostatic color plotter according to the present invention, and Fig. 2 shows an embodiment of the color misregistration prevention control device for an electrostatic color plotter according to the present invention. FIG. 3 is a flowchart showing one embodiment of the processing flow in FIG. 2; FIG. 4 is a flowchart showing another embodiment of the processing flow in FIG. 2; The figure is a schematic diagram of an electrostatic color plotter, and FIG. 6 is a diagram for explaining problems with a conventional color misregistration prevention control device for an electrostatic color plotter. 1... Winding roller, 2... Drive roller, 3
...Paper feed roller, 4...Electrostatic recording paper, 5...Cyan developer, 6...Magiender developer, 7...Black developer, 8...Yellow developer, 13...Writing head, 14... ...mark reading sensor,
15... Registration mark, 20... Control device.

Claims (1)

[Scope of utility model registration request] In order to feed or rewind the electrostatic recording paper, a take-up roller, a drive roller, and a paper feed roller are provided so that they can rotate forward or reverse. An electronic color plotter is equipped with a temperature sensor, a humidity sensor, and a calculation means for calculating the number of times to feed and rewind an electrostatic recording paper in a blank state based on temperature and humidity data, and starts plotting for each color. A color shift prevention control device for an electrostatic color plotter, characterized in that color shift is prevented by feeding and rewinding the electrostatic recording paper in a blank state the number of times calculated by the calculation means.