JPS5944238B2 - drafting pen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to enhancing the ink supply of drafting pens.

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, a drafting pen having a structure as shown in FIG. 1, for example, is used by attaching it to the head of the drafting machine, in place of the conventional pen for ink drafting. 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. Reference numeral 2 denotes 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 in a spiral manner along the threaded part surface, and has an air passage 2b inside. It consists of a cylindrical part having a cavity 2c communicating with one end 2b', and a pen tip holding part having an umbrella-shaped hole 2d inside thereof communicating with the cavity 2c and the held pen tip 1.

Reference numeral 3 denotes a cylindrical falling weight 5 forming a needle method attachment member, and a cavity portion C formed in C to create a gap for ink circulation between its outer peripheral surface and the inner peripheral surface of the cavity portion 2c. It is movably accommodated in the cavity 2c, and its lower end is restrained at a point of communication between the cavity 2c and the umbrella-shaped hole 2d.

3a is a notch for ink distribution provided in 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 has an umbrella-shaped hole. The tip is located within the pen nib 1 so that the tip slightly protrudes from the tip of the nib 1 via the tip 2d.

Then, by moving the needle method 4, the inside of the pen tip 1 is
The falling weight 3 and the needle method 4 combined therewith regulate 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.

A stopper 6 restricts the upward movement of the falling weight 3, has an ink outflow hole o6a, and is screwed onto the upper end of the pen support 2.

T is an ink cartridge, 8 is ink, and the ink cartridge is detachably attached to the upper end of the holder 5. Reference numeral 9 denotes a cover member of the ink cartridge, which is screwed onto the holder 5.

5. This drawing pen draws lines by continuously supplying ink guided to the pen tip 1 by capillary action when the pen tip 1 is moved in contact with the paper surface.

However, with this pen, when an attempt is made to speed up drafting by increasing the pen's running speed, the ink delivery cannot keep up with the pen's running speed. This puts restrictions on the running speed, and the maximum speed varies depending on the type of paper and ink, but is generally about 15 m/min for a 0.3φ pen tip. Furthermore, if the pen tip is made thinner to draw even thinner lines, the flow of ink will be poor and lines will become blurred or broken, making it currently impossible to draw lines with a line width of 0.1φ or less. It is. The present invention has been made in view of the above points, and is provided with a means for vibrating the needle body in the axial direction to promote the outflow of ink, thereby making it possible to speed up drafting and draw with thin lines. .

Next, a detailed explanation will be given using the drawings. FIG. 2 is a cross-sectional structural diagram of essential parts showing one embodiment of the present invention, in which 1 is a pen tip, 2 is a pen tip support, 3 is a falling weight made of magnetostrictive material which is a needle attachment member, and 4 is a falling weight made of magnetostrictive material. Needle body, 5 is a holder, 5a is an ink outflow hole, 6
6a is a stopper, 6a is an ink outflow hole, 7 is an ink cartridge screw, 9 is a cover member, and the above structure is the same as that in FIG. 1 except that the falling weight 3 is made of a magnetostrictive body.

10 is an excitation winding wound around the outer peripheral surface of the holder 5; 10a;
11 is a cover member for protecting the excitation winding, which is screwed into the holder 5.

Reference numeral 12 denotes an ultrasonic oscillator, which constitutes vibration supply means for the needle body 4 by the falling weight 3 made of the magnetostrictive material, the excitation winding 10, the ultrasonic oscillator 12, and the like.

In this drafting pen, an ultrasonic oscillator 12 is attached to the lead wire 10a.
When connected, the magnetostrictive falling weight 3 vibrates in the pen axis direction, and the needle body 4 directly connected thereto also vibrates in the pen nib 1 in the pen axis direction.

As a result, the boundary layer between the ink and the wall surface of the ink flow path is destroyed, and the frictional resistance against the ink in the small gap between the needle bodies 4 provided inside the pen tip is reduced, promoting the flow of the ink. Therefore, if the vibration force is adjusted appropriately according to the running speed of the automatic drafting machine zero-ringing pen, the ink will flow down in accordance with the running speed of the pen, and even if the pen runs at high speed, the ink will not come out. 9, the lines become blurred due to poor quality, and 4, the ink comes out excessively, so the lines never become smudged. In addition, good drawings can be made even with a thin pen tip.
Although the present invention has been described above with reference to one embodiment, the vibration supply means for the needle body 4 may also be configured as shown in the embodiment diagrams below. In the embodiment shown in FIG. 3 (the same reference numerals as in FIG. 2 indicate the same parts), the vibration supply means includes a falling weight 3 made of a magnetic material, an excitation winding 10, a spring body 13 for return, and an excitation winding. line 1
The configuration includes an excitation power source 12 that supplies an intermittent current with a fast cycle to zero. In this case, by winding the excitation winding 10 upwardly, the falling weight 3 made of magnetic material is attracted upward, and when the excitation is released, the falling weight 3 is inserted into the lower end of the stopper 6. The repulsive force of the spring body 13 quickly returns the needle body 4 to the pen tip 1.
vibrate inside the pen in the direction of the pen axis. Also, Fig. 4 (Fig. 2
The same symbols as in the figures indicate equivalent parts.

) is an example in which the vibration supply means includes a needle body 4 made of a magnetic material, a regulation plate 4a that prevents the needle body 4 from coming off from the pen tip 1, and a regulation plate 4.
It is composed of a return spring body 13 provided between a and the stopper 6, an excitation winding 10, an excitation power source 12, etc., and by exciting the excitation winding 10 with a fast cycle intermittent current from the excitation power source 12. , suction and return of the needle body 4 are repeated to vibrate the needle body 4 in the direction of the pen axis. In addition, in the example shown in FIG. 5 (the same reference numerals as in FIG. 2 indicate the same parts), the needle body 4 is made of magnetostrictive material, this is connected to the excitation winding 10 and the ultrasonic oscillator 12, and the regulating plate 4a is used. The pen tip 1 vibrates in the direction of the pen axis while preventing the pen from coming off the nib 1. As is clear from the above description, according to the present invention, the delivery of ink can be reliably promoted, so the traveling speed of the drafting pen can be improved, and the great advantage that it is possible to draw lines with a thin line width is obtained. It is something that can be done,
The practical effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing the structure of a drafting pen, and FIGS. 2, 3, 4, and 5 are partial sectional views showing an embodiment of the present invention.

Claims (1)

[Claims] 1. A drafting pen that has a movable needle in a pipe-shaped nib and supplies ink from an ink reservoir through a gap between the needle and the nib to draw a line. The mounting member is made of a magnetostrictive material or a magnetic material, and an excitation winding for forming an alternating excitation magnetic field is provided on the outer periphery of the needle or its mounting member, and this is connected to an excitation power source to vibrate the needle. A drafting pen characterized by at least promoting the supply of ink.