JPH0124638B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a drawing device for a drawing machine, which supplies a consumable writing lead in a lead holder, such as a pencil lead, onto a paper surface. .

(Prior Art) Conventionally, as a consumable writing lead that can be used with a long lead, one such as that disclosed in Japanese Patent Application Laid-open No. 135697/1983 has been proposed.

The above-mentioned drawing machine is equipped with a lead chuck mechanism that moves forward while holding the lead in the lead holder, and releases the holding of the lead when it detects that the lead has worn out. When it is released,
The lead holder can be raised while the lead remains in the head body to change the clamping position of the lead by the chuck, and the lead chuck mechanism inside the lead holder changes the clamping position as the lead wears out. It is now possible to change it and send out the core.

(Problem to be Solved by the Invention) The above-described drawing machine has the problem that the chuck slips on the core, and when the core is clamped tightly to make the chuck perfect, the core is scraped off. The problem is that the shavings make the chuck even more slippery, and the core becomes thinner and more likely to break.

Therefore, an object of the present invention is to provide a drawing device for a drafting machine having a core feeding mechanism that does not scrape the core.

(Means for Solving the Problems) In order to achieve the above objects, the present invention provides the following drawing machine drawing device.

In other words, there is a lead feeding mechanism equipped with a pressure member for applying pressure to the consumable writing lead as it faces toward the drawing board, a lead holder mechanism that moves up and down as it moves toward the drawing stop state and the drawing state; A drafting machine comprising a push pin holder mechanism that supplies a push pin for pressurizing the consumable writing lead into the lead holder via the pressure member on the axis formed by the lead feeding mechanism and the lead holder mechanism. It is a line drawing device.

(Function) According to the present invention, as the consumable writing lead in the lead holder wears out, the push pin in the push pin holder mechanism is fed into the lead holder, and the pressure member of the lead feeding mechanism moves the lead into the lead holder. You can work on the drawing while sending it.

(Example) Hereinafter, the configuration of the present invention will be described in detail with regard to an example shown in the accompanying drawings.

Reference numeral 1 denotes a print head attached to a numerical control system, and is configured to be controlled to move in a predetermined direction within a plane parallel to the upper surface of the drawing board 2.

Reference numeral 3 denotes a lead holder that moves up and down with respect to the printing head 1. A lead a is supplied to this core hole 3a, and a lead fall-off prevention rubber 4 is inserted into the core hole to prevent the supplied lead a from falling off the lead holder 3. It is provided at the lower end of 3a.

The core holder 3 is attached to the substrate 5 of the printing head 1.
It is stretched between the lower beam plate 5a and the intermediate beam plate 5b extending from the bottom.

Between the intermediate beam plate 5b and the upper collar 3b of the core holder 3, there is a core holder return spring 6 that is biased upward.
is interposed.

A vertical solenoid 7 controlled by a controller (not shown) for lowering the core holder 3 against the return spring 6 is installed on the intermediate beam plate 5b.
The core holder 3 is lowered by a vertical lever 9 attached to a drive shaft 8 of a vertical solenoid 7.

Therefore, the above-mentioned device constitutes a so-called pen up-down mechanism.

That is, when the upper and lower solenoids 7 are excited,
The drive shaft 8 is attracted and the vertical lever 9 is lowered, whereby the lead holder 3 is lowered against the return spring 6 and enters the drawing state.

When the upper and lower solenoids 7 are de-energized, the core holder 3 is raised by the return spring 6, and the drawing is stopped.

Next, the core feeding mechanism inside the core holder 3 as described above will be explained.

That is, the lead in the lead holder 3 is pressed by a push rod 11a via a push pin b of a push pin holder 10, which will be described later.This push rod 11a is fixed to a slider 11, and the slider 11 further moves on a guide shaft 12. Go up and down.

The guide shaft 12 is stretched between the upper beam plate 5c and the middle beam plate 5d, and a writing pressure spring 13 is stretched between the slider 11 and the middle beam plate 5d.

In addition, a motor 14 installed on the intermediate beam plate 5b
There is a pulley 16 on the shaft 15, one end of which is fixed, and the belt 1 is wound around the pulley 16.
7 is attached to the upper end of the slider 11 via a pulley 18 of the upper beam plate 5c.

The motor 14 is equipped with a detector that can freely adjust the rotational force.
A DC motor is used, and its rotational force is controlled by a controller (not shown).

That is, when the push rod 11a is pulled out from the push pin holder 10 as described below, a strong current flows in the motor 14, a slight current flows in the drawing state, that is, in the pendant state, and an intermediate current flows in the drawing stopped state, that is, in the pen up state. flows, and a rotational force corresponding to each state is applied in the upward direction of the belt by the motor.

There is also a flag 19 on the belt 17,
This blocks the light beams from the light emitter and light receiver at the upper limit sensor 20 and lower limit sensor 21.

Since the lead feeding mechanism is configured as described above, when a slight current is applied to the motor 14, the slider 11 is pulled by the pen pressure spring 13 against the rotational force of the somotor 14, and the push rod 11a is moved downward. The push rod 11a presses down on the lead a via the push pin b to apply writing pressure.

Then, as the core wears out, the slider 11
is lowered, and the belt 17 that has been wrapped around the pulley 16 is gradually pulled out from the pulley 16.
Then, the flag 19 rises, and when this blocks the light beam of the lower limit sensor 21, a signal is given from the controller to apply a strong current to the motor 14, and the belt 17 is wound back against the pen pressure spring 13.

When the belt 17 is unwound and its flag 19 blocks the beam of the upper limit sensor 20, the motor 1
4 is given a signal from the controller that an intermediate current flows, and the push rod 11a is connected to the push pin holder 10.
It stops at the position where it was pulled out.

When the motor 14 receives a signal from the controller to cause a small current to flow, the spring 13 applies pen pressure to the lead of the lead holder 3, but in this case, the upper and lower solenoids 7 are naturally turned on. The lead holder 3 is lowered by the vertical lever 9 against the return spring 6, and is in the drawing state, that is, the pen-down state.

Although the core feeding mechanism is configured as described above,
A wire or a toothed belt may be used instead of the belt 17. When a toothed belt is used, the pulley 16 becomes a toothed pulley.

Next, the push pin holder mechanism will be explained.

The push pin holder 10, which is provided with vertical holes 22 for individually storing a large number of push pins b, is slidably mounted on a holder receiver 24 provided on the lower surface of the intermediate beam plate 5d, and is connected to a stepping pulse motor 26. Since the feed screw 25 is screwed into the bracket 28 of the push pin holder 10, the push pin holder 10 moves back and forth along the holder receiver 24.

The stepping motor 26 is turned ON by the upper limit sensor 20, that is, the push rod 11a.
When the push pin holder 10 is pulled up to the push rod guide 27 of the intermediate beam plate 5d, the stepping motor 26 is activated to feed the push pin holder 10 by a certain amount and insert the vertical hole 22 containing the new push pin into the core hole 3a of the lead holder 3. Move it to the opposite position.

When the push pin holder 10 is moved by a certain amount, the motor 14 is controlled by the controller and a weak current flows, so the push pin holder 11a moves against the rotational force.
presses the push pin b with the pen pressure spring 13.

When all the push pins b of the push pin holder 10 are used, the last sensor 31 and a flag 32 provided at the front end of the push pin holder 10 detect the end position.

By this detection, the stepping pulse motor 26
Reverse it and return to the initial position.

Further, on the inner surface of the lower end of the vertical hole 22 of the push pin holder 10, there is a rubber core 23 to prevent the core from falling off.

As mentioned above, the printing head 1 has a core holder mechanism,
It consists of a core feeding mechanism and a push pin holder mechanism.
2 and a Y cursor 35 that moves in the Y-axis direction along a horizontal rail 34 stretched between the X cursors 32, 32.

The one shown is provided with a plurality of print heads.

Now, when drawing, the upper and lower solenoid 7 is turned ON by a signal from the controller, the lead holder 3 is lowered by the upper and lower lever 9, and the drawing state is shifted to the drawing state. Draw while applying pen pressure.

In this case, a slight current flows through the motor 14 in response to a signal from the controller, giving it a weak rotational force, and the writing pressure spring 13 applies writing pressure to overcome this rotational force.

When the pen is turned off to stop drawing, the solenoid 7 is turned OFF, and an intermediate current flows through the motor 14 in response to a signal from the controller, counteracting the pen pressure spring 13, and when the lead holder 3 rises, the push rod 11a also rises. Therefore, the lead is not pushed out from the lead holder 3.

During drawing, as the core wears out, belt 1
7, the motor 14 is maintained at a weak rotational force, so it is gradually pulled out from the pulley 16 by the pen pressure spring 13, and the flag 19 is set to the lower limit sensor 21.
When detected, the image head drive stops and
At the same time, a strong current flows through the motor 14 under the control of the controller, giving it a strong rotational force, and the belt 17 is rewound against the pen pressure spring 13. When the flag 19 is detected by the upper limit sensor 20, the push rod 11a reaches the upper limit via the slider 11,
The stepping pulse motor 26 is turned to NO, and the push pin holder 10 is moved forward, so that a new push pin 9 is opposed to the core hole 3a of the lead holder 3.

Next, the motor 14 is controlled by the controller so that a slight current flows, and the push rod 11a pushes the new push pin 9 using the pen pressure spring 13, and presses the lead a through the previous push pin 9. In this state, The image head drive is activated again.

Repeat the above operations to attach push pin holder 1.
When all the push pins 9 in 0 are inserted into the lead holder 3 and the leads are exhausted, the last sensor 31 detects the flag 32 and reverses the motor 26 to return the push pin holder 10 to the initial position. Here, the push pin b inside the lead holder 3 is taken out and refilled into the push pin holder 10, and at the same time, a new lead is filled into the lead hole 3a of the lead holder 3.

In this case, the upper and lower solenoids 7 are turned off and the core holder 3 is raised.

As described above, the number of short push pins corresponding to the length of the core is inserted into the push pin holder, and when the long core is worn out, the push rod is raised upwards and the push pins are filled into the push pin holder. The pin holder is designed to be able to slide by a stepping mechanism in conjunction with the upper limit sensor, and the push rod is pulled up by rotating a specified amount of pulses using a DC motor with a detector. When down, the speed can be controlled by the DC motor for soft down.

Further, since the core is pressed by a push rod via a push pin, the present invention is effective when the push rod is too thin to maintain its strength.

Note that the push pin holder 10 may be of a rotary type,
The core holder mechanism and core feeding mechanism are also not limited to the illustrated structure.

(Effects of the Invention) According to the present invention, the push pin is cut into small pieces and inserted into the lead holder one after another without cutting the lead, so even if the push pin is thin, it can be configured to be short. Not only can bending be prevented, but also the feed stroke can be shortened, so a normal pen pressure spring can be used.

[Brief explanation of drawings]

Figures 1 and 2 are a perspective view of the entire drawing machine and a partial perspective view of the cursor section, and Figure 3 is a cross-sectional view of the device of the present invention.
FIG. 4 is a partially cutaway side view of the device of the present invention. 1... Drawing head, 3... Core holder, 6...
Core holder return spring, 7...Upper and lower solenoid, 8
... Drive shaft, 9 ... Up and down lever, 10 ... Push pin holder, 11 ... Slider, 11a ... Push rod, 14 ... Motor, 26 ... Motor.

Claims (1)

[Claims] 1. A lead feed mechanism equipped with a pressure member for applying pressure to the consumable writing lead toward the drawing board, a lead holder mechanism that moves up and down as it moves toward the drawing stop state and the drawing state, and a lead holder mechanism that and a push pin holder mechanism for supplying a push pin into the lead holder for pressurizing the consumable writing lead via the pressure member on the axis formed by the lead feeding mechanism and the lead holder mechanism. Striking device.