JPH0930193A - Pencil plotter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be able to record with predetermined density of high quality even when a color pencil lead is used by providing writing pressure control means for lowering the writing pressure of a pencil pen as the drawing speed of the pen is accelerated. SOLUTION: A pen elevating mechanism 11 vertically moves a color pencil pen 13. When the color pencil lead is consumed, it receives a lead discharge command from a control circuit 30, rises the pen 13 to be engaged with a knocking mechanism 12 to protrude the lead. In this case, a writing pressure pattern forming unit 32 for forming a writing pressure pattern regarding a drawing printing element based on the forming data of a speed pattern forming unit 13 for forming the speed pattern regarding the drawing printing element based on input drafting information is provided. An X-side driver 34, a Y-side driver 35 and a pen vertical driver 33 are so controlled as to give gradually lowering writing pressure at the time of positive acceleration area, predetermined writing pressure at the time of equal speed area and gradually increasing writing pressure at the time of negative acceleration area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pencil plotter for recording with a pencil pen. Particularly, it relates to improvement of drawing quality of a pencil plotter using a color pencil lead.

[0002]

2. Description of the Related Art A pencil plotter of this type has been put to practical use and widely used. That is, a pen block equipped with a pencil pen moves up and down on a recording medium in the XY directions, and the pencil pen is controlled up or down to a recording position or a non-recording position according to a drawing signal to draw a desired image. . Generally, in this type of conventional apparatus, a relatively hard black pencil lead that has been fired is used. Therefore, there is a relationship that a constant writing density can be obtained under a substantially constant writing pressure.

[0003]

When a color pencil lead is used in the conventional apparatus as described above, there is a case where the relationship that a constant drawing density is obtained under a constant writing pressure cannot be established. . As a color pencil lead, for example, a soft unburned pencil lead such as a crayon is used, and when the writing pressure is constant, the writing is light at the time of writing or low-speed recording, and dark at high-speed recording. The present invention provides a high quality drawing plotter capable of drawing with a constant density when a pencil pen having such characteristics is used.

[0004]

Therefore, according to the present invention, in a pencil plotter for drawing a desired figure or the like on a recording medium by attaching a pencil pen holding a pencil lead to a drawing head, the drawing speed of the pencil pen The writing pressure control means is provided to reduce the writing pressure of the above-mentioned pencil pen in accordance with the rise of the.

[0005]

[Function] When recording with an unfired color pencil lead,
It is considered that the frictional heat between the pencil lead tip and the drawing medium has an effect. The friction is small and the frictional heat is relatively low at low speed recording, but the frictional heat generated at high speed recording becomes large, and the pencil lead itself is melted, and as a result, a large amount of drawing substance is left on the medium. . Therefore, in order to make the generated frictional heat uniform, a smaller writing pressure is applied during high speed recording than during low speed recording.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the preferred embodiments of the drawings. 1 and 2 relate to an embodiment of the present invention. FIG. 1 is an explanatory view showing a configuration of a recording unit and its control circuit unit of a pencil plotter of the present invention, and FIG. 2 is an explanatory view showing an example of recording control. is there.

Referring to FIG. The recording unit is a pen block 1
It is shown as 0. The pen block 10 includes a pen up-and-down mechanism 11 including an actuator that moves up and down according to a signal, a knock mechanism 12 for performing a knocking operation of a pencil pen, and a color pencil pen 13 having a color pencil lead. .

Further, as a means for controlling this recording unit,
Control circuit 3 that receives drawing information from the host computer
0, a velocity pattern creating unit 31 that creates a velocity pattern related to the drawing line based on the input drawing information, and a writing pressure pattern creating unit 32 that creates a writing pressure pattern related to the drawing line based on the creation data of the speed pattern creating unit 31. ,
A pen up-and-down drive unit 33 for vertically moving the pen up-and-down mechanism 11 of the pen block 10 as a recording unit based on the drawing information on the drawing line, an X-side drive unit 34 for moving the pen block 10 in the X-axis direction, and the pen block 10. A Y-side drive unit 35 that moves in the Y-axis direction is provided.

The pen up / down mechanism 11 of the pen block 10 is
The color pencil pen 13 held via the arm is moved up and down. This pen up / down stroke during the recording operation is performed by the knock mechanism 12 of the color pencil pen 13
The range is not engaged with. In this stroke range, the color pencil pen 13 is moved up and down between a recording position (down position) and a non-recording position (up position) for recording. When the color pencil lead is exhausted and the so-called color pencil pen 13 is in a coreless state, the pen up / down mechanism 11 receives the centering command from the control circuit and moves the color pencil pen 13 beyond the above stroke. The pencil lead is centered by raising and engaging with the knock mechanism 12.

Now, the drawing information as shown in the upper diagram of FIG. 2, that is, the straight line (straight line AB) from point A to point B and point B
It is assumed that a command for drawing a straight line (straight line BC) from the point to the point C is input to the control circuit 30. Speed pattern creation unit 31
Creates each speed control pattern from the length of the straight line AB and the length of the straight line BC. The middle diagram of FIG. 2 is the speed control pattern diagram. Therefore, straight line AB and straight line BC
When drawing, the recording unit sequentially undergoes positive acceleration motion, constant velocity motion, and negative acceleration motion.

The writing pressure pattern creating section 32 receives the velocity pattern and creates a writing pressure application pattern. As shown in the lower diagram of FIG. 2, the writing pressure gradually decreases when the velocity control pattern is in the positive acceleration region, a constant writing pressure when the velocity control pattern is in the constant velocity region, and gradually increases when the velocity control pattern is in the negative acceleration region. It is a pattern that applies each writing pressure. This can be said to be an inverse proportion of the speed control pattern. In the apparatus of this embodiment, the frictional heat with respect to the color pencil pen 13 is made uniform by performing the above operations.

In this case, since the straight line AB and the straight line BC are continuously drawn in the above drawing example, when the writing of the second straight line BC is started,
The frictional heat from the previous writing may remain. In such a case, the amount of frictional heat remaining is assumed to be the size of the writing distance of the drawing line, and the writing pressure at the start of writing the subsequent drawing line is set to the normal writing start based on the length of the previous writing distance. The writing pressure may be decreased as compared with the writing pressure.

The speed control pattern and the writing pressure application pattern created as described above are respectively in the X-side drive section 3.
4, used to control the Y-side drive unit 35 and the pen up-and-down drive unit 33. The pen up / down drive unit 33 moves the pen up / down mechanism 11 up and down according to the writing pressure application pattern to control the writing pressure of the color pencil pen 13.

[0014]

As described above, according to the present invention, there is an advantage that high quality recording with a constant density is possible even when a color pencil lead is used.

[Brief description of drawings]

FIG. 1 is a configuration explanatory diagram of a pencil plotter according to the present invention.

FIG. 2 is an explanatory diagram showing an example of recording control of the present invention.

[Explanation of symbols]

 10: Pen block 13: Color pencil pen 30: Control circuit 32: Writing pressure pattern creation unit

Claims (1)

[Claims] 1. In a pencil plotter for attaching a pencil pen holding a pencil lead to a drawing head to draw a desired figure or the like on a recording medium, the writing pressure of the pencil pen is increased as the drawing speed of the pencil pen increases. Pencil plotter device with pen pressure control means to reduce.