JPH0355584A - Density adjusting mechanism - Google Patents

Abstract

PURPOSE:To adjust the density of an electrostatic printing type plotter which has high reliability at low cost by counting pixel numbers of printing. CONSTITUTION:The density is adjusted by a mechanism 14 which counts the pixels of the printing and a control mechanism 8 which opens the valve 10 of a concentrated liquid tank 9. The printing pixel counting mechanism 14 sends a signal indicating that a constant number of pixels are printed to the control mechanism 8, which when receiving the signal, opens the valve 10 of the concentrated liquid tank 9 for a certain time. Consequently, the density of the inexpensive electrostatic recording type plotter which has high reliability can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to density adjustment of an electrostatic printing type plotter.

[Summary of the invention]

The present invention makes it possible to adjust the density of an electrostatic printing block at low cost and with high reliability by counting the number of printed pixels. [Prior Art] Conventionally, electrostatic printing In this type of profiler, density adjustment was performed by reading the transmittance of the developer using an optical sensor.

[Problem to be solved by the invention]

In conventional technology, in order to measure transmittance with an optical sensor, it was necessary to immerse the optical sensor in a developer. This method has the problem of shortening the lifespan of the sensor because the colorant from the developer adheres to the sensor. A method was taken to measure the rate, but this method had the problem of high cost.

[Means to solve the problem]

In order to solve the conventional problems, the present invention has a structure in which the mechanism for counting the pixels of printing and the valve of the concentrate tank are opened, and the concentration is adjusted by the control mechanism.

[Effect]

The printing pixel counting mechanism transmits a signal that a certain number of pixels have been printed to the control '4B mechanism, and the control '4T5 mechanism operates to open the valve of the concentrate tank for a certain period of time when the signal is received.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In Figure 1, the data input to the block is an 8-bit parallel signal, DINIOI, STROBEIO.
The data is stored in the input buffer 1, and the data is passed from the input data control section 2 to the block control section 3.
controls the entire plotter. On the other hand, the input data is input not only to the plotter control section 3 but also to the print pixel counting section 14. The print pixel counting section l4 is controlled by the input data control section 2. When data is stored in input buffer 1, the input data control section outputs signal RDY103.
indicates that the data cannot be accepted, and at the same time, a signal LOA is sent to the shift register 4 of the print pixel counting section 14.
Load the data using D108. It also waits for the signal PRDY107 to become true to the block control unit 3, and then passes data when it becomes true. In this state, the next data can be input, and the signal RDY103 is set to true, indicating that the next data can be accepted. The shift register 4 is connected to the counter 5 and receives a signal EN1 from the input data control section.
09 and signal! Due to iNABLE1, the counter 5 counts only the portions where the printed pixels are true. The above contents are shown in Figure 2. When DINIOI is set to 55H and the data written in FIG. 2 is received many times, counter 5 overflows and signal CYIIO becomes true. When this signal becomes true, gate 6. By DF/F7, the signal CLκ10
One pulse of 2 is input to the valve control section 8 by the signal PULSE113. When the valve control unit 8 receives the signal PULSC113 becoming true, it opens the valve 10 for a certain period of time using the signal DR114.

Figure 3 shows a time chart showing the timing of opening the valve. Through the above operation, the concentrated liquid in the concentrated liquid tank 9 is supplied to the developing system consisting of the pump 11, the developing liquid tank 12, and the developing device 13, and the colorant consumed according to the number of printed pixels is replenished and the developing liquid is supplied. Concentration remains constant.

〔Effect of the invention〕

As described above, the present invention has the advantage that it is possible to perform density adjustment for blocks using an electrostatic recording method at low cost and with high reliability without using the conventional optical sensor.

[Brief explanation of drawings]

FIG. 1 is a bronch diagram showing one embodiment of the present invention, FIG. 2 is a time chart for counting 1-byte pixels, and FIG.
The figure is a time chart showing the timing of opening the valve. Large buffer input data control section Professional control section Shift register Counter gate D F/F ・Valve control section ・Concentrate tank ・Valve pump Developer tank ・Developer ・Print pixel counting section ・Gate

Claims (1)

[Claims] In an electrostatic recording plotter that has a developer tank, a concentrate tank, a pump, and a developer, a mechanism that counts printed pixels and a control unit that reads the counted value open the valve of the concentrate tank and release the developer. A density adjustment mechanism characterized by adjusting density.