JPS5920478B2 - drafting pen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drafting pen that utilizes ultrasonic vibration to promote ink delivery.

Recently, the use of automatic drafting machines that combine microcomputers with drafting machines to automatically and quickly produce ink drawings has become popular. In this case, instead of the conventional inking pen, a drafting pen having a structure as shown in FIG. 1, for example, is used by being attached to the head of the drafting machine. In FIG. 1, reference numeral 1 denotes a pen tip, which is shaped like a pipe and has a diameter corresponding to the thickness of the required line. 2
is a pen nib support body which has a threaded part 2a for screwing the holder 5 described later on its outer surface, and an air passage 2b extending spirally along the threaded part surface, and has internally a threaded part 2a at one end and an upper part of the air passage 2b. It consists of a cylindrical part having a cavity 2c communicating with it 2b', and a pen tip holding part having an umbrella-shaped hole 2d inside thereof communicating with the cavity 2c and the pen tip 1 held therein.

Reference numeral 3 denotes a cylindrical falling weight, which is formed to create a gap for ink circulation between its outer peripheral surface and the inner peripheral surface of the cavity 2c, and is movably housed within the cavity 2c. The lower end is restrained at the point of communication between the cavity 2c and the umbrella-shaped hole 2d.

3a is a notch for ink distribution provided at a part of the lower end of the falling weight 3, and 4 is a needle that is thinner than the inner diameter of the pen tip 1 connected to the center of the lower end of the falling weight 3, and is inserted through the umbrella-shaped hole 2d. The tip is positioned within the pen nib 1 so that the tip slightly protrudes from the tip of the nib 1.

The movement of the needle 4 prevents clogging in the pen tip 1, and the falling weight 3 coupled to the needle 4 adjusts the supply of ink. Reference numeral 5 denotes a holder, which has an ink outflow hole 5a in its upper end closed portion, and is screwed onto the outer periphery of the pen tip support 2.

Reference numeral 6 denotes a stopper for regulating the upward movement of the falling weight 3, which has an ink outflow hole 6a and is screwed onto the upper end of the pen tip support 2.

1 is an ink cartridge, 8 is ink, and the ink cartridge T is removably pushed into the end of the holder 5 and fixed thereto.

Reference numeral 9 denotes a cover member of the ink cartridge T, which is screwed onto the holder 5.

This drafting pen has an ink 8 that is guided to the pen tip 1 by capillary action when the pen tip 1 is moved in contact with the paper surface.
is supplied continuously to draw lines.

However, with such a pen, if an attempt is made to speed up drawing by increasing the running speed of the pen, the ink delivery will not be able to keep up with the running of the pen. This places restrictions on the running speed, and although the maximum speed varies depending on the type of paper and ink, it is generally about 15 m/min for a 0.13φ pen. In addition, if you make the pen tip extremely thin to draw even thinner lines, the ink will not come out well and the lines will become blurred.
At present, it is impossible to draw a line with a line width of 0.1φ or less. The present invention has been made in view of the above points, and utilizes ultrasonic vibration to promote the delivery of ink, thereby making it possible to draw high-speed drawings using fine lines.

Next, it will be explained in detail using the drawings. FIG. 2 is a partially sectional structural diagram showing an embodiment of the present invention, and in the figure, reference numeral 1
8 to 8 indicate the same parts as those with the same reference numerals in FIG. A first metal resonator (horn) 9 also serves as a cover portion, and is screwed into the holder 5.

10 is a first annular electrode, 11 is a first annular piezoelectric element, 12 is a second annular electrode, 13 is a second annular piezoelectric element, 14 is a second metal resonator, and 15 is an insulator. Vibrator, 16
are connection bolts, which are assembled in the following manner to constitute an ultrasonic transducer having a resonator.

First, after screwing the connecting port 6 into the center of the first metal resonator 9, the insulating vibrator 15 is inserted, and the first electrode 1 is inserted therein.
0, the first piezoelectric element 11, the second electrode 12, and the second piezoelectric element 13 are sequentially inserted. Finally, the second metal resonator 14 is assembled by screwing onto the connecting bolt 16. Therefore, the first
, the second metal resonators 9 and 14 are mechanically coupled by a connecting bolt 16, and at the same time, the first electrode 10 and the second metal resonator 14 are electrically connected, and the electrode 10
, 12 excites the first and second piezoelectric elements 11 and 13. Reference numeral 17 denotes a head section of an automatic drafting machine, which moves in an arbitrary coordinate direction according to instructions from a computer or the like. Reference numeral 18 denotes an attachment that guides the pen up and down, and is fixed to the base 17a of the head section 17.

Reference numerals 19 and 20 designate holder tubes that are screwed together and integrated into one body, in which the drafting pen is incorporated and fixed, and are guided by the attachment 18 so as to be freely raised and lowered.

21 is a spring body that applies writing pressure to the pen tip 1; 22 is a spring body that positions the pen in a raised state when the operating power is off; 23;
1 is an up/down operation stick for the pen, which is moved up and down using a magnet built into the head section 17 or the like.

In the drawing pen of this embodiment, if the ultrasonic oscillator 24 is connected to the first and second electrodes 10 and 12 and the first and second piezoelectric elements 11 and 13 are excited, the first and second piezoelectric elements 11 and 13 are excited. The metal resonators 9 and 14 vibrate in the direction of the pen axis, and this vibration vibrates the entire pen containing ink to apply vibration pressure, and at the same time destroys the boundary layer between the ink and the wall of the ink flow path. This reduces frictional resistance and promotes ink flow.

Therefore, in the case of an automatic drafting machine, if the vibration force is appropriately selected according to the running speed of the pen, the ink will flow smoothly according to the running speed of the pen, and even if the pen runs at high speed, the ink will not flow. It is possible to draw at high speed without the lines becoming blurred due to poor ink flow or the lines becoming smudged due to excessive ink flow. Furthermore, even in the case of a thin pen tip, the supply of ink is promoted, thereby preventing line breaks (fading). Furthermore, this drawing pen uses ultrasonic waves to vibrate at a high frequency during drawing, so if the pen pressure on the paper is set appropriately, the pen moves while the pen tip approaches and separates from the paper surface in extremely short time intervals. This reduces the frictional resistance between the paper and the pen tip.

Therefore, the wear of the pen tip is reduced and the life of the pen can be extended. In addition, in this embodiment structure, the piezoelectric element, that is, the driving source is placed at the end, and the hollow cover is used as a horn, which reduces weight.
Since the piezoelectric element is sandwiched between the second metal resonators and assembled, the assembly is easy. Although two piezoelectric elements are used above, it goes without saying that one or more piezoelectric elements may be used.

Also, a magnetostrictive vibrator can be used instead of the piezoelectric element. Furthermore, although an ink cartridge type ink cartridge has been described above, it is obvious that the ink cartridge type ink cartridge can also be applied to a structure having an ink chamber in which ink is filled. As is clear from the above description, according to the present invention, it is possible to obtain a drafting pen that does not cause lines to break or become blurred even when using a thin nib or when running at a high speed. It is highly effective when used for high-speed drafting using automatic drafting machines.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional view showing an example of the structure of a drafting pen, and FIG. 2 is a partially sectional view showing an example of the structure of the present invention.

Claims (1)

[Claims] 1. An ultrasonic vibrator having a resonator is coupled coaxially to the top of a drafting pen, which is designed to draw lines by supplying ink from an ink reservoir into the pipe-shaped nib, and the ultrasonic oscillator outputs A drafting pen characterized in that the ultrasonic vibrator is excited by the ultrasonic vibrator to vibrate the resonator in the pen shaft direction, thereby vibrating the entire drafting pen in the pen shaft direction to promote ink supply. .