JPS5843040B2 - Driving device for drawing equipment in automatic drafting machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a drawing instrument in an automatic drafting machine.

In order to increase the speed of automatic drafting, the pen is raised and lowered at high speed. However, when the pen is lowered at high speed, the tip of the pen strongly collides with the drawing surface of both sheets of paper on the drawing board, causing it to bounce. If the pen moves at this time, the bouncing of the pen may result in a dotted line being drawn when it should have drawn a straight line, and there is also a flaw in that the pen tip receives a shock, shortening its lifespan. .

Therefore, the object of the present invention is to apply a braking force to the descent of the pen just before the tip of the pen collides with the drawing surface, to soften the shock given to the tip of the pen, and to eliminate the above-mentioned defects. be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

Reference numeral 1 designates a head of an automatic drawing machine, which moves in parallel on a drawing board 2 in a predetermined direction.A mounting plate 3 of this head is integrally formed with a tube portion 4. A pipe 5 is fixed with screws, and a support plate 6 is connected to the lower end of the iron pipe 5.

A mounting hole is provided in the support plate 6, and a tube body 7 is fitted into the mounting hole, and a holder tube 8 is slidably inserted into the tube body 7.

A cap 9 is screwed onto the upper part of the holder tube 8, and a coil spring 10 is disposed between the flange of the cap 9 and the flange protruding from the outer peripheral surface of the intermediate portion of the tube body 7. The holder tube 8 is pushed upward.

A drawing instrument 11 is slidably fitted into the holder tube 8, and the drawing instrument 11 is urged downward by a spring 12, with its tip protruding from the lower surface of the holder tube 8. There is.

A fitting groove 13 is formed on the lower outer periphery of the holder tube 8 .

14 is a slide ball bearing 15°16 on the tube 5.
This is an elevation transmission shaft that is inserted into the transmission shaft so that it can be raised and lowered through the shaft, and a pin 19 that projects from the eccentric part of the member 18 is slidably fitted into a horizontal hole 17 provided at the upper part of the shaft. 18 is a pair of rotary solenoids 20 fixed to the support plate 6;
It is fixed to the output shaft of the 2N (see Figure 2).

When the current signal "I II" is energized to the coil of the rotary solenoid 20, its output shaft is driven in the counterclockwise direction of rotation in the diagram, and the rotary solenoid 21 is driven "'".
When the current signal ``■'' is applied, the output shaft is configured to be driven in the direction of rotation of the hour hand in the figure.

An arm 22 is fixed to the lower end of the transmission shaft 14 in a perpendicular direction, and the tip of the arm 22 is fitted into the fitting groove 13 of the holder tube 8.

Figure 2 shows the block circuit of this device, line 23.2
4 is connected to a controller (not shown).

25 is a delay circuit, 26 is a one-shot multivibrator, and 27 is an AND circuit, one input part a of which is connected to the line 23, and the other inverting input part a connected to the output terminal of the one-shot multivibrator 26. , and a voltage of 41 I 11 is always applied.

Reference numerals 28 and 29 are amplifiers, 30 is an OR circuit, and 20 and 21 are the aforementioned rotary solenoids, which are connected as shown in the figure.

The delay circuit 25, one-shot multivibrator 26, rotary solenoids 20, 21, etc. serve as a means for momentarily applying a braking force to the drawing instrument just before the tip of the drawing instrument reaches the drawing surface. However, the means is not particularly limited to the above configuration, and any other arbitrary configuration can be used.

Next, the operation of this embodiment will be explained.

When a signal "I11" consisting of a positive DC current is supplied to the line 23 from the controller and a signal "011" to the line 24, this "I II signal is supplied to the AND circuit 2.
7 and the amplifier circuit 28, the coil of the lowering rotary solenoid 20 is energized, and the rotary solenoid 20
is excited, and the member 18 rotates in the counterclockwise direction of rotation of the hour hand in FIG.

Then, the transmission shaft 14 descends and the holder tube 8 is moved by the spring 10.
0 Push down against elasticity.

The above-mentioned "I n and 0" signals constitute a pen down signal.

On the other hand, the "Itl" signal on the line 23 is input as a trigger pulse to the one-shot multivibrator 26 via the delay circuit 25, and is activated.

The one-shot multivibrator 26 includes a delay circuit 25
When a trigger pulse is received from , a pulse of ``I11'' is output with a slight delay from the transmission of the signal ``■'', and the input terminal of the AND circuit 270 is lowered to the level of ``OII'', and the input terminals a and b of the AND circuit 270 are output. The AND circuit 27 is momentarily cut off, and the descending rotary solenoid 20 is momentarily turned off.

At the same time, the “I 1” of the one-shot multivibrator 26
1 pulse signal passes through the OR circuit 30 and the amplifier circuit 29,
The rising rotary solenoid 21 is energized, the member 18 is instantaneously driven in the direction of rotation of the hour hand, and a braking force is applied to the transmission shaft 14 at the moment the tip of the drawing instrument 11 reaches the drawing paper surface.

When the one-shot multivibrator 26 is cut off, the transmission shaft 14 reaches its lowest position, and the tip of the drawing instrument 11 gently contacts the drawing paper surface.

When the transmission shaft 14 is in the descending state, the controller sends a signal of "I +1" to the line 24 to prevent a positive DC current, and when a signal of "0'" is sent to the line 23, the "■" of the line 24 is sent to the line 24. The signal ``'' is connected to the OR circuit 30 and the amplifier 29.
The coil of the lifting rotary solenoid 21 is energized, and the member 18 is rotated by a predetermined angle in the direction of rotation of the hour hand in FIG. 1, thereby raising the drawing instrument 11.

At this time, the coil of the lowering rotary solenoid 20 is in a non-excited state.

The "I11" signal supplied to line 24 and the O11 signal supplied to line 23 constitute a pen-up signal.

Note that it is also possible to use only the descending rotary solenoid 20 without using the ascending rotary solenoid 21.

In this case, the drawing device 11 is
Immediately before the tip of the lowering rotary solenoid 20 reaches the drawing surface, the coil of the lowering rotary solenoid 20 is momentarily de-energized (off), and the braking force by the spring 10 is momentarily applied to the transmission shaft 14.

The OFF state of the lowering rotary lean lens 20 is instantaneously released.

If the lowering rotary solenoid 20 is held off, the transmission shaft 14 returns upward due to the elasticity of the spring 10.

In the first embodiment, the lifting rotary solenoid 21 constitutes a pen-up mechanism, and the pen-up mechanism and the lowering rotary solenoid 20 constitute a pen lifting mechanism.

Further, in the second embodiment, the spring 10 constitutes a pen-up mechanism, and the pen-up mechanism and the lowering rotary solenoid 20 constitute a pen lifting/lowering mechanism.

As is clear from the above description, the delay circuit 25, the one-shot multivibrator 26, and the AND circuit 27
constitutes a circuit that outputs a pen-up signal to the pen lifting mechanism when a predetermined period of time has elapsed from the point in time when the controller outputs the pen-down signal.

These circuits can be modified in various ways and are not particularly limited to the circuits shown.

In the first embodiment, the pen-down signal is a signal that energizes the rotary solenoid 20 (ON) L and the rotary solenoid 21 is de-energized (OFF). This is a signal that turns off the rotary solenoid 21 and turns on the rotary solenoid 21.

Further, in the second embodiment, the pen down signal is a signal that turns on the rotary solenoid 20, and the pen up signal is a signal that turns off the rotary solenoid 20.

Based on this pen-up signal, the rotary solenoid 20
The output shaft &nf screw 10 biases the hour hand in the rotating direction in the figure.

As described above, in the present invention, the drawing instrument is lowered at high speed, and a braking force is applied instantaneously to the lowering of the drawing instrument just before the tip of the drawing instrument comes into contact with both paper surfaces. The tip of the drawing tool does not come into shocking contact with both paper surfaces, and the bouncing phenomenon that occurs when the tip of the drawing tool contacts both paper surfaces can be prevented, and the shock at the tip of the drawing tool is softened. Therefore, there are effects such as being able to protect this.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention; FIG. 1 is a sectional view showing the internal structure of the head of an automatic drafting machine, and FIG. 2 is a block circuit diagram of the present invention. 1...Head, 2...Drawing board, 8...
...Holder, 9...Cap, 11...
... Drawing instrument, 14 ... Lifting transmission shaft, 20,
21...Rotary solenoid, 23.24.
... Line, 25 ... Delay circuit, 26.
...One-shot multivibrator, 27...
...AND circuit, 28,29...amplifier,
30...OR circuit.

Claims (1)

[Scope of Claims] 1. The output shaft is driven by a pen down signal from the controller, and the lowering solenoid and the drawing tool 11 that drive the drawing tool 11 connected to the output shaft in a direction approaching the drawing board surface are shown in the figure. A pen up/down mechanism is configured with a pen up/down mechanism that is driven in a direction upward from the board surface, and the pen up/down mechanism is driven by pen down and pen up signals from the controller to move the tip of the drawing instrument 11 toward the drawing board surface. In an automatic drawing machine that can be brought into and out of contact, a circuit is provided that outputs a pen-up signal to the pen lifting mechanism when a predetermined period of time has elapsed from the output of the pen-down signal from the controller, so that the tip of the drawing instrument 11 is placed on the drawing surface. A driving device for a drawing instrument in an automatic drafting machine, characterized in that a braking force is instantaneously applied to the drawing instrument 11 immediately before the drawing instrument 11 reaches the drawing point. 2. The drive device for a drawing instrument in an automatic drafting machine according to item 1, wherein the pen-up mechanism is constituted by a lifting solenoid 21. 3. A drive device for a drawing instrument in an automatic drafting machine according to claim 1, wherein the pen-up mechanism is constituted by a spring 10 that urges the drawing instrument 11 in a direction away from the drawing surface.