JPS6261439B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic drawing machine in which a consumable writing lead in a lead cartridge is pressed against a drawing surface by the pressure of a torque motor, and the lowering movement of the lead relative to the drawing surface is controlled. The object of the present invention is to provide an automatic drawing machine that can perform drawings at high speed.

The configuration of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

1 is a drawing board, 2 is a drawing head, and the drawing board 1 is
A numerical control mechanism controlled by a controller 52 so as to be controlled to move in a predetermined direction within a plane parallel to the top surface of the board and while maintaining a constant distance from the drawing surface. It is connected to 50. Incidentally, the drawing board 1 may be replaced with a drum connected to a rotary drive device, and the head 2
On the other hand, the drawing screen 1a side may be configured to be movable. 3 is a board fixed to the head casing 4, and a pulse motor 5 (a servo motor may also be used) is fixed to this board, a worm 6 is mounted on one of the rotation shafts of the pulse motor 5, and an origin detection device is mounted on the other. A board 7 for use is fixed. A small hole 8 is transparently provided in the board 7, and a detection device 9 is fixedly installed in the movement path of the small hole 8. 10 is a holding tube fixed to the substrate 3, and a main shaft 11 is rotatably supported by this holding tube via a ball bearing. Reference numeral 12 denotes a cartridge holder detachably fixed to the main shaft 11, and a drawing board 1 is provided on the upper and lower flanges of this cartridge holder.
Holes 13 and 14 are transparently provided along an axis perpendicular to the surface, and these holes 13 and 14 constitute a cartridge holding guide. The cartridge holding guide section is attached to the upper and lower flanges of the holder 12, and the main shaft 1
A large number of them are provided at predetermined intervals around one. The hole 13 formed through the upper flange of the holder 12 has a small diameter part and a large diameter part, as shown in FIG. A ring-shaped plate member 15 is fixed to the upper end surface of the upper flange of the holder 12, and a hole 16 is transparently formed in the plate member 15 so as to be located on the same center line as the holes 13 and 14. There is. 17 is a collar member disposed within the large diameter portion of the hole 13;
Due to the elasticity of the spring 18, the plate member 15
It is in elastic contact with the bottom surface of. Reference numeral 19 denotes a core cartridge in which a core 20 made of a lead core or other similar material is placed, and is slidably inserted into the holes 16, 13, and 14. Head 1 of core cartridge 19
9a comes into contact with the collar member 17, and by the locking action of the collar member 17, the core cartridge 19 is held so that its lower end is exactly close to and opposed to the surface of the drawing board 1. Reference numeral 21 denotes a cartridge position detection device, which has a light emitting element 22 and a light receiving element 23 as main components. The detection device 21 is arranged such that the tip of the lead cartridge 19 is located on the drawing board 1.
The head 19a of the lead cartridge 19 is positioned on the light emitting line of the light emitting element 22 when the lead cartridge 19 is slightly raised relative to the above drawing surface, and its position is set so that the light receiving element 23 operates. Reference numeral 24 denotes a torque motor fixed to the casing 4, and an endless motor is connected between a pulley 25 fixed to the output shaft of the torque motor and a pulley 26 rotatably attached to the casing 4 via a bracket. A timing belt 27 is stretched around it with an appropriate tension. Reference numeral 28 denotes a guide shaft erected on the base plate 3, the upper end of which is fixed to a support piece 29 fixed to the casing 4. The guide shaft 28
An elevating body 31 is fitted into the elevating body 31 via a slide ball bearing 30 so as to be freely raised and lowered, and the upper end of a push shaft 32 is fixed to the elevating body 31. A mounting piece 33 is fixed to the elevating body 31, and the mounting piece 3
3 is fixed to the belt 27. 34 is
This is a guide plate erected on the base plate 3, and limit switches 35 and 36 are provided at the upper and lower parts of the guide plate. A shaft 37 is slidably inserted into a slit 38 formed through the guide plate 34 via a ball bearing, and one end of the shaft 37 is fixed to the elevating body 31. Reference numeral 39 denotes a solenoid fixed to the casing 4, and a brake shoe 40 is fixed to the operating shaft of the solenoid. Torque motor 24, limit switches 35 and 36
is connected to the controller 52 as shown in FIG. The tip of the push shaft 32 is slidably inserted into a guide hole of a guide 41 fixed to the substrate 3 so as to be positioned on the alignment circle of the core cartridge 19. the collar member 17;
Spring 18 Push shaft 32 and lead cartridge 1
The frictional force between 9 and the core 20 is generated by the torque motor 2.
4 constitutes a lead cartridge moving mechanism 42 for moving the lead cartridge in the direction toward and away from the drawing surface by the rotational movement of the lead cartridge 4. but,
The mechanism 42 is not particularly limited to what is illustrated. Note that 45 and 46 are gears.

Next, the operation of this embodiment will be explained.

First, the head casing 4 is lifted while the elevating body 31 is held in the raised position. Next, the core cartridge 19 is inserted into each cartridge holding guide portion of the cartridge holder 12, and the cartridge holder 12 is fixed to the main shaft 11 with its origin coincident.

Next, the head 2 is returned to its original position and the tip of each core cartridge 19 is set to be close to the drawing surface on the drawing board 1. Next, according to commands from the controller 52, the head 2 is controlled to move in a predetermined direction within a plane parallel to the surface of the drawing board. On the other hand, the solenoid 39 is turned on by the command from the controller.
When the brake shoe 40 is separated from the pulley 25 and the torque motor 24 is driven in the forward rotation direction, the pulley 25 rotates and the elevating body 31 and push shaft 32 descend accordingly. The push shaft 32 is inserted into a selected lead cartridge 19 directly below it, and the push shaft 32 is inserted into the selected lead cartridge 19.
It comes into contact with the upper end of the inner core 20 and presses the core 20. The lead 20 is lowered by the pressing force from the push shaft 32, and stops when its lower end contacts the drawing surface. This completes the pen-down operation. When the lead 20 descends, the lead cartridge 19 moves down against the elasticity of the spring 18 due to the frictional force therebetween, and its lower end lightly contacts the drawing surface. The core 20 in contact with the drawing surface is pressurized by the torque of the torque motor 24 with a predetermined pressure suitable for drawing. This pressing force can be changed by appropriately controlling the amount of electricity supplied to the torque motor 24.

When it is desired to move the lead 20 away from the drawing surface (pen-up), the torque motor 24 is reversed in accordance with a command from the controller. When the torque motor 24 reverses, the push shaft 32 rises and the pressure applied to the lead 20 is released.
It rises slightly until it comes into elastic contact with the lower surface of the plate member 15. As the lead cartridge 19 rises, the lead 20 slightly rises due to the frictional force therebetween, and the lead 20 is slightly separated from the drawing surface. When the lead cartridge 19 returns to a predetermined position due to the elasticity of the spring 18, the detection device 21 is activated. Based on the detection signal of this detection device 21, the controller stops (OFF) the torque motor 24.
When a command is issued, the torque motor 24 is turned off and its reverse rotation is stopped. Torque motor 24
At the same time as OFF, solenoid 39 turns OFF,
As a result, the brake shoe 40 is pressed against the pulley 25 by the elasticity of the spring, and the pulley 25 is fixed. This completes the pen-up operation.
A predetermined pattern is drawn on the drawing screen by the movement control of the head 2 and the pen up and down operations.

Incidentally, during drawing, as the core 20 wears out, the elevating body 31 and the push shaft 32 descend. When the core 20 in the core cartridge 19 is almost gone, the shaft 37
comes into contact with the movable switch piece of the limit switch 35 and presses it. When the limit switch 35 operates, the controller issues a reverse rotation command to the torque motor 24 based on the signal from the limit switch 35. Due to the reverse rotation of the torque motor 24, the push shaft 32 rises, and when its lower end is slightly separated from the upper end of the core cartridge 19, the shaft 3
7 contacts the limit switch 36, the limit switch 36 operates, the controller issues a stop command to the torque motor 24, the torque motor 24 is turned off, and at the same time the solenoid 39 is turned off.
When the brake switch 40 is turned OFF, the pulley 2
5 and the pulley 25 is fixed. Next, a drive command is issued to the pulse motor 5, and the worm 6
rotates, and the main shaft 11 and cartridge holder 1
2 rotates. When the next core cartridge 19 is located directly under the push shaft 32, the pulse motor 5
stops. This operation completes the replacement of the core cartridge 19. In addition, limit switch 3
During the reverse movement of the torque motor 24 based on the signal No. 5, the controller does not issue a stop command to the torque motor 24 based on the detection signal of the detection device 21. In this type of automatic drawing machine, a computer is normally used as the controller 52, and outputting various control signals based on input signals from the limit switches 36, 35 and the detection device 21 is performed by the computer program. This can be done very easily by those skilled in the art using software, and since the inside of the controller is not the gist of the present invention, detailed illustrations and explanations of the inside of the controller 52 are omitted.

As described above, in the present invention, as soon as the pen up operation is completed, the lead cartridge position detection device operates and the rotation of the torque motor is stopped, so that the push shaft is not unnecessarily long and does not separate from the upper end of the lead. There is an effect that the response speed of pen up and down operations can be increased, and the drawing speed can be increased.

[Brief explanation of the drawing]

The figure shows one preferred embodiment of the present invention.
2 is a front sectional view, FIG. 2 is a side sectional view, FIG. 3 is a partially enlarged sectional view, and FIG. 4 is an explanatory diagram of a block circuit. 1... Drawing board, 2... Drawing head, 3... Board,
4...Head casing, 11...Main shaft, 12...
... Cartridge holder, 17... Collar member,
18... Spring, 19... Core cartridge,
20... Core, 21... Cartridge position detection device, 24... Torque motor, 32... Push shaft, 3
9... Solenoid, 40... Brake shoe, 4
1... Guide, 42... Lead cartridge moving mechanism.

Claims (1)

[Claims] 1. A drawing surface and a head 2 that can be moved in a predetermined direction while maintaining a constant distance relative to the drawing surface.
and a torque motor 24 disposed in the head 2.
, a lead cartridge 19 supported on the head 2 so as to be movable in the axial direction, and the lead cartridge 1
a push shaft 32 connected to the output shaft of the torque motor 24 for pressurizing the consumable writing lead 20 in the drawing surface direction; and the lead cartridge 19.
The cartridge holder 12 provided in the head 2 and the core cartridge 19 are held by the rotational movement of the torque motor 24. Accordingly, in an automatic drawing machine equipped with a lead cartridge moving mechanism 42 for moving the lead cartridge in a direction toward and away from the drawing surface, a cartridge position detection device 21 is provided to detect a set raised position of the lead cartridge 19, An automatic drafting machine characterized in that, based on a detection signal from the cartridge position detection device 21, a stop command is issued to the torque motor 24 that drives the extrusion shaft 32 in a direction away from the drawing surface.