JPS58188699A - Controller for note of automatic drawing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

In this type of automatic drawing machine, memorization tools are usually hollow pens,
Ballpoint pens, lead cores, etc. are used. 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 strongly hit the drawing surface, shortening the life of the writing instrument or damaging the drawing surface. If an attempt was made to avoid this problem, there existed a drawback in that the writing instrument could not be driven in the direction of the drawing surface at high speed, resulting in a longer drawing time.

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 cursors 10.
12 is movably attached, and the X cursor 10.12
The X rail 14 is parallel to the four surfaces of the table,
Moreover, it is suspended so as to be perpendicular to the X rail 6.8. Pinions connected via reduction gears to the output shafts of servo motors MX (not shown) each built into the cover of the X cursor 10.12 are provided along the longitudinal direction of the X rail 6.8. The rack gear (not shown) meshes with the rack gear (not shown). The carrier 1 is mounted on the Y rail 14.
A pinion is provided along the longitudinal direction of the Y rail 14, and a pinion is built in the carrier 16 and connected to the output shaft of a servo motor MY (not shown) via a reduction gear. It meshes with a rack gear (not shown).

The motor drive signal of the controller 18 is the servo motor MX.
, MY, and when the output shaft of the servo motor MXMY rotates, the X cursor 10°12 moves along the X rail 6.8, and the carrier 16 is configured to move along the X rail 14. . A bolt 20 is attached to the carrier 16.
(See FIG. 2)
is installed.

Next, the internal structure of the printing head 22 will be explained with reference to FIGS. 2 and 5.

Reference numeral 24 denotes a holding tube fixed to the tube portion of the base plate 22a of the head substantially perpendicularly to the surface of the table 4, and a moving tube 26 is slidably fitted into the inner peripheral surface of the cough holding tube 24. A writing instrument holder 60 is slidably inserted into the moving tube 26. A coil spring 32 is disposed between the snap ring disposed at the lower part of the holding tube 24 and the lower end of the moving tube 26, and the coil spring 32 is arranged between the upper end of the writing instrument holder 30 and the lower surface of the cap attached to the upper end of the moving tube 26. In between,
A coil spring 34 is arranged. A writing instrument 56, such as a ballpoint pen or the like, is attached to the writing instrument holder 30. Reference numeral 68 denotes an annular body which is screwed into the upper threaded portion of the moving tube 26, and a circumferential groove 40 is formed on the outer peripheral surface of this annular body. 42 is fixed to the substrate.

C, a motor, an arm 44 is fixed to the output shaft of this motor, and a forked part formed on one side of the cough arm 44 has a protrusion 46;
It is slidably fitted into the circumferential groove 40 via. A coil spring 48 is arranged between the ring body 58 and the holding tube 24.

50 is a screw shaft with a knob 52 that is screwed into a screw hole formed in the substrate 20, a stopper member 54 is fixed to this, and the stopper surface of the cough stopper member 54 is directly under the other arm 44. positioned.

FIG. 4 is a block circuit diagram for controlling the motor 42 mentioned above. In the figure, 56 is a flip-flop circuit, the input end of which is connected to the controller 18. 58 is a clock pulse oscillator, 60 is an AND circuit, 62 is a counter, 64 is a ROM, that is, a writable and readable storage device, and the ROM contains:
C, a control signal to the motor 42 is stored for each address signal. The control signal causes the writing instrument 56 to descend at a high speed, and just before the tip of the writing instrument 66 reaches the drawing on the drawing surface of the table 4, the descending speed is slowed down so that it comes into gentle contact with the drawing. Specifically, it is programmed to control a voltage changeover switch and a current direction changeover switch. Switches 66 and 68 are configured to be opened and closed by the output signal of the ROM, and a high voltage is applied to the contacts of the switch 66, and a low voltage is applied to the contacts of the switch 68. 7
0,72,74.76 is a current direction changeover switch,
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 from the controller 18 to 111 is applied to the input of the 7-lip flop 56, this causes
The flip-flop 56 is set, the output terminal becomes "11", the gate of the AND circuit is opened, and the clock pulse of the pulse oscillator 58 is inputted from the AND circuit 60 to the counter 62, which counts the clock pulses and outputs the clock pulse. Based on the count signal, an address signal is supplied to the RCM 64. The ROM 64 sequentially outputs a signal to control the switch section according to the address signal of the counter 62.

An example of this signal will be explained with reference to FIG. f164 first closes switches 66, 70, and 76, and then closes switches 68.
It opens at 74.721. As a result, a high voltage (A) in the positive direction is applied to the D, C, and motors 42, the arm 44 rotates at high speed in the counterclockwise direction of rotation of the hour hand in FIG. The writing instrument holder 30 then descends at high speed, and in conjunction with this, the writing instrument holder 30 also descends at high speed toward the drawing. When the writing instrument '56 approaches the drawing to a predetermined distance, the RO
M 64 switches switch 66 based on the input address signal.
is opened, switch 68 is closed, and a low forward voltage (C) is applied to the motor. This reduces the descending speed of the holder 60.

Next, just before the writing instrument 36 lands on the drawing, the ROM 64
switch 68,70.76it open, switch 66.
74.72 is closed. As a result, a high voltage (c) is applied to the D, C, and motors 42, and the holder 5
01i, the inertia in the downward direction is taken care of, and C, the reverse voltage (c) applied to the motor 42 causes the robot to stop momentarily just before landing on the drawing. Next, R (M 64 is switch 6B, 70.7
6 is closed, and the switch 66°74.72 is opened, so that the writing instrument 36 slowly comes into contact with the drawing. Next, the ROM
A reset pulse is supplied from 64 to the reset input of flip-flop 56, and flip-flop 56 is reset. Next, when 6 pen-up signals from the controller 18 are input to the set input terminal of the 7 lip-flop 56, the flip 70 knob 56 is set, the output terminal becomes @1'', and the gate of the AND circuit 60 opens. , the clock pulses of the pulse oscillator 58 are input from the AND circuit to the counter 62, and the counter 62 counts the clock pulses and merges the address signal into the ROM 64 based on this clock count signal.ROM 6
4 Outputs the Vi control signal 0 This applies a high voltage in the opposite direction to D, C, and motor 42, and the arm 4
4 rotates in the direction of rotation of the hour hand in FIG.
When the other surface of the rising 0 arm 44 is about to collide with the stopper member 54, a positive low voltage (E) is applied to D, C, and motor 42, and the brakes are applied to D, C, and motor 42. , the rising speed of the holder '50 is increased,
After that, the other arm 44 is moved to the stopper member 54.
The pen collides with and is locked by it, completing the pen-up operation. The vertical stroke of the holder 50 can be performed by loosening the fixing screw 70 and rotating the screw shaft 50 to change the height of the stopper surface. In addition, the above ROM 64
The control signals stored in the holder 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. This has the effect of controlling the movement of the writing instrument in the direction toward and away from the drawing surface.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention, in which Fig. 1 is an overall perspective view of an automatic drawing machine, Fig. 2 is a sectional view of the drawing head, Fig. 6 is a plan view of the drawing head, and Fig. 4 is a perspective view of the automatic drawing machine. Block circuit, FIG. 5 is an enlarged explanatory diagram of operation. 2-・In 4...f-pull 6,8...X
Rail 10.12...X cursor 14...
X rail 16. -Carrier 1B...Controller 20...Bolt 22...Printing head 22
a... Substrate 24... Holding tube 26... Moving tube 60... Writing instrument holder 62... Coil spring 54... Coil spring 66... Writing instrument 42.
...D, C motor 44...arm 64...
ROM (Storage Device) Patent Applicant: Muto Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A drawing head 2 that is movably supported relative to the drawing while maintaining a predetermined distance from the drawing, and whose movement is controlled in a predetermined direction by a controller.
The writing instrument holder 601 is held movably in the direction toward and away from the drawing surface on the base plate 22a of No. 2, and the motor 4 is disposed on the head base plate 22a.
2, the writing instrument holder 50 is moved toward and away from the drawing surface by forward and reverse rotation of the output shaft of the cough motor 42, and the tip of the writing instrument 56 held in the memorization tool holder 50 is moved toward the drawing surface. the control signal of the motor 42 is stored in a writeable and recallable storage device 64, and the control signal of the storage device 640 is called based on a pen drive signal of the controller;
A writing instrument control device for an automatic drafting machine, characterized in that the voltage applied to the motor 64 is controlled by the control signal.