JPH0327396B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling a writing instrument in a numerically controlled rectangular coordinate automatic drawing machine.

In this type of automatic drawing machine, a hollow pen, ballpoint pen, lead lead, or the like is usually used as a writing instrument.
If this writing instrument is lowered at high speed and the tip of the writing instrument comes into contact with the paper on the drawing surface, the tip of the writing instrument will hit the drawing surface strongly and the life of the writing instrument will be shortened.
It will damage the drawing screen. If an attempt was made to avoid this problem, the writing instrument could not be driven in the direction of the drawing surface at a high speed, resulting in a drawback that the drawing surface time would become longer.

The present invention aims to eliminate the above-mentioned defects.

EMBODIMENT OF THE INVENTION Below, the structure of this invention is demonstrated in detail based on the Example shown in an accompanying drawing.

Reference numeral 2 denotes a body of a numerically controlled rectangular coordinate automatic drawing machine, and a table 4 is fixed to the body 2.
X rails 6, 8 arranged on both sides of the table 4
X cursors 10, 12 are movably attached to the It is hung on a shelf. Pinions connected via reduction gears to output shafts of servo motors MX (not shown) built into the covers of the X cursors 10 and 12, respectively, are provided along the longitudinal direction of the X rails 6 and 8. It meshes with a rack gear (not shown).
A carrier 16 is movably attached to the Y rail 14, and a servo motor built in the carrier 16
A pinion connected to the output shaft of MY (not shown) via a reduction gear meshes with a rack gear (not shown) provided along the longitudinal direction of the Y rail 14. When the motor drive signal from the controller 18 is supplied to the servo motors MX and MY, and the output shafts of the servo motors MX and MY rotate, the X cursors 10 and 12 move along the X rails 6 and 8, and the carrier 16 moves along the Y rail. 14. Bolts 2 are attached to the carrier 16.
0 (see FIG. 2), the substrate 22a of the printing head 22 is attached.

Next, the internal structure of the print head 22 will be explained with reference to FIGS. 2 and 3.

Reference numeral 24 indicates a table 4 attached to the pipe portion of the head substrate 22a.
The holding tube 24 is a holding tube fixed substantially perpendicularly to the surface, and a moving tube 26 is slidably fitted into the inner circumferential surface of the holding tube 24 . A writing instrument holder 30 is slidably inserted into the moving tube 26.
A coil spring 3 is connected between the snap ring disposed at the lower part of the holding tube 24 and the lower end of the moving tube 26.
2 is disposed, and a coil spring 34 is disposed between the upper end of the writing instrument holder 30 and the lower surface of the cap attached to the upper end of the movable member 26. A writing instrument 36 such as a ballpoint pen or the like is attached to the writing instrument holder 30. 38 is the moving tube 2
6, and has a circumferential groove 40 formed on its outer circumferential surface. Reference numeral 42 denotes a DC motor fixed to the substrate, and an arm 44 is fixed to the output shaft thereof, and a forked portion formed on one side of the arm 44 slides into the circumferential groove 40 via a protrusion 46. They fit together freely. Said ring body 3
A coil spring 48 is disposed between the holding tube 24 and the holding tube 24 . 50 is a screw shaft with a knob 52 that is screwed into a screw hole formed in the base plate 20, and a stopper member 54 is fixed to this screw shaft, and the stopper surface of the stopper member 54 is located directly below the other arm 44. ing.

FIG. 4 is a block circuit diagram for controlling the DC motor 42. In the figure, 56 is a flip-flop circuit, the input terminals of which are connected to the controller 18. 58 is a clock pulse oscillator, 60 is an AND circuit, 62 is a counter, and 64 is a ROM, that is, a writable and recallable storage device.
The control signal to the address signal is stored for each address signal. The control signal lowers the writing instrument 36 at high speed, slows down the descending speed just before the tip of the writing instrument 36 reaches the drawing on the drawing surface of the table 4, and causes the DC motor 42 (specifically, is programmed to control a voltage selector switch and a current direction selector switch. 6
6 and 68 are switches, which are configured to be opened and closed controlled by the ROM output signal, and a high voltage is applied to the contacts of the switch 66.
A low voltage is applied to the contacts. 70,7
2, 74, 76 are current direction changeover switches;
The opening/closing is controlled by the output signal of the ROM 64.

Next, the operation of this embodiment will be explained.

When the pen-down signal of 1" is supplied from the controller 18 to the input terminal of the flip-flop 56, the flip-flop 56 is set and the output terminal becomes 1", the gate of the AND circuit is opened, and the clock pulse of the pulse oscillator 58 is output. is input from the AND circuit 60 to the counter 62,
The counter 62 counts clock pulses and supplies an address signal to the ROM 64 based on the clock count signal. ROM64
outputs a signal for sequentially controlling the switch section according to the ANDRESS signal of the counter 62. An example of this signal will be explained with reference to FIG. ROM64
First, the switches 66, 70, and 76 are closed, and the switches 68, 74, and 72 are opened. This results in
A high voltage (a) in the positive direction is applied to the DC motor 42,
The arm 44 rotates at high speed in the counterclockwise direction of rotation of the hour hand in FIG. descend. Writing instrument 3
6 approaches the drawing to a predetermined distance, the ROM 64
, the switch 66 is opened and the switch 68 is closed based on the input address signal, and the forward low voltage (b) is
Applied to DC motor. This reduces the descending speed of the holder 30. Next, just before the writing instrument 36 lands on the drawing, the ROM 64 opens the switches 68, 70, 76;
2 is closed. As a result, a high voltage (c) in the opposite direction is applied to the DC motor 42, and the holder 30
Due to the inertia in the downward direction and the reverse voltage (c) applied to the DC motor 42, it stops momentarily just before landing on the drawing. Next, the ROM 64 switches switches 68, 70, 7.
6 is closed, and switches 66, 74, and 72 are opened, so that the writing instrument 36 comes into gentle contact with the drawing. Next, a reset pulse is supplied from the ROM 64 to the reset input of the flip-flop 56, and the flip-flop 56 is reset. Next, when a pen-up signal of 1" is input from the controller 18 to the set input terminal of the flip-flop 56, the flip-flop 56 is reset and the output terminal becomes 1", the gate of the AND circuit 60 is opened, and the pulse oscillator 58 is activated. The crop pulse is input from the AND circuit to the counter 62, which counts the clock pulses and outputs the address signal based on this clock count signal.
Provides for ROM64. ROM64 outputs a control signal. As a result, a high voltage (d) in the opposite direction is applied to the DC motor 42, the arm 44 rotates in the direction of rotation of the hour hand in FIG. 2, and the holder 30 rises. Just before the other surface of the arm 44 collides with the stopper member 54, a forward low voltage (E) is applied to the DC motor 42, a brake is applied to the DC motor 42, and the rising speed of the holder 30 is reduced. Thereafter, the other arm 44 collides with and is locked against the stopper member 54, completing the pen-up operation. The vertical stroke of the holder 30 can be performed by loosening the fixing screw 70 and rotating the screw shaft 50 to change the height of the stopper surface. The control signals stored in the ROM 64 are merely examples, and the control signals for moving the writing instrument holder in the most preferable state are not particularly limited to those shown.

Since the present invention is configured as described above, there is an effect that the movement of the writing instrument in the manner of approaching and separating from the writing surface can be controlled in the optimum state.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention; FIG. 1 is an overall perspective view of an automatic drafting machine, FIG. 2 is a sectional view of the drawing head, FIG. 3 is a plan view of the drawing head, and FIG. FIG. 5 is an explanatory diagram of the operation of the block circuit. 2... Aircraft, 4... Table, 6, 8... X rail, 10, 12... X cursor, 14... Y rail, 16... Carrier, 18... Controller, 2
0... Bolt, 22... Drawing head, 22a...
Substrate, 24... holding tube, 26... moving tube, 30...
...Writing instrument holder, 32...Coil spring, 34...
... Coil spring, 36 ... Writing instrument, 42 ... DC motor, 44 ... Arm, 64 ... ROM (memory device).

Claims (1)

[Claims] 1. On the substrate 22a of the drawing head 22, which is supported movably relative to the drawing surface while maintaining a predetermined distance from the drawing surface, and whose movement is controlled in a predetermined direction by a controller. A writing instrument holder 30 is held movably in directions approaching and away from the drawing surface, and the writing instrument holder 30 is connected to a motor 42 disposed on the head board 22a, and the output shaft of the motor 42 is rotated in the forward and reverse directions. An automatic drafting machine in which the writing instrument holder 30 is moved toward and away from the drawing surface by rotation so that the tip of the writing instrument 36 held in the writing instrument holder 30 approaches and moves away from the drawing surface, The motor 42
A storage device 64 in which control signals can be written and recalled.
A control signal of the storage device 64 is called based on a pen drive signal of the controller, and the voltage applied to the motor 64 is controlled by the control signal.
0 toward the drawing surface, based on the control signal, a relatively large voltage is first supplied to the motor 42 for lowering the writing instrument holder, and the writing instrument holder 30 is moved toward the drawing surface. The writing instrument holder 30 rapidly moves in the approach direction, and then, before the writing instrument holder 30 reaches the drawing surface, a reverse voltage is applied to the motor to slow down the movement of the writing instrument holder 30, and then the motor 42 is activated to move the writing instrument holder in the downward direction. Supplying voltage to the writing instrument holder 3
When raising the writing instrument holder 30 with respect to the writing surface by gently touching the writing instrument holder 30, a relatively large voltage is supplied to the motor 42 to raise the writing instrument holder. The holder 30 is rapidly moved in an upward direction relative to the drawing surface, and then, before the writing instrument holder 30 is stopped by the stopper member, a reverse voltage is applied to the motor to decelerate the upward movement of the writing instrument holder 30. .The writing instrument control method is characterized in that, after that, a voltage is supplied to the motor 42 in the direction of raising the writing instrument holder, so that the writing instrument holder 30 is loosely engaged with the stopper member.