JPH0124639B2 - - 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 use a long lead, one such as that disclosed in Japanese Patent Application Laid-open No. 135697/1983 has been proposed.

The above-mentioned drawing machines are 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 the lead is released, the lead holder can be raised while the lead remains in the head body, and the position where the lead is clamped by the chuck can be changed. The mechanism allows the core to be sent out by changing the clamp position.

(Problems to be Solved by the Invention) The drawing machine described above has the problem that the chuck slips against the core, and if the core is clamped tightly to make the chuck perfect, the core may be 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, it is an object of the present invention 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 following drawing device for a drawing machine is provided.

In other words, there is a lead holder that moves up and down toward the drawing stop state and the drawing state, a push rod that presses the consumable writing lead in the lead holder toward the drawing board using a writing pressure spring, and A drawing machine for a drafting machine consisting of a chuck device that can change the clamping position of the chuck with respect to the push rod according to the requirements, and a lifting device that works in conjunction with the chuck release device to change the clamping position of the chuck with respect to the push rod against the pen pressure spring. It is a wire device.

(Function) According to the present invention, the clamping position of the push rod that constitutes the lead feeding mechanism equipped with the pressure member for pressurizing the consumable writing lead in the lead holder in the direction of the drawing board can be changed. A chuck device is provided that can be raised and lowered, and a writing pressure spring is applied to the chuck device, whereby writing pressure is constantly applied to the lead in the lead holder, and the push rod descends as the lead wears out.
Moreover, the clamping position of the chuck relative to the push rod can be changed to lower the push rod.

(Example) The embodiments shown in the drawings will be described below.

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

That is, as shown in FIGS. 1 and 2, the X cursor 59 moves in the X-axis direction along the vertical rail 58 on the base 57, and the horizontal rail 60 extends between the X cursors 59 and 59. Y moving in the Y-axis direction
This is provided as a Y cursor 61 of a drawing machine consisting of a cursor 61. In the illustrated example, a plurality of print heads are provided starting from the print head.

The present invention relates to the improvement of the printing head as described above, and will be explained starting from the ones in FIGS. A core a is supplied to the hole 3a, and a core fall-off prevention rubber 4 is provided at the lower end of the core hole 3a to prevent the supplied core a from falling off the core holder 3.

Inside the core hole 3a are bushes 6, 7, and 8 that support the top, bottom, and center of the core, and springs 9 and 10 are interposed between these bushes. Button 7 at the lower end of the inside
is supported directly on the bottom of the core hole 3a, but the upper end and central bushes 6, 8 are adapted to move as the core wears out, and these bushes are spaced apart from each other by interposed springs 9, 10. The core is always lowered at a constant interval to prevent the core from bending.

The core holder 3 is attached to the substrate 1 of the printing head 1.
Lower beam plate 11a and intermediate beam plate 11b extending from 1
It is strung between.

A lead holder return spring 12 biased upward is interposed between the intermediate beam plate 11b and the upper collar 3b of the lead holder 3.

A vertical solenoid 13 controlled by a controller (not shown) for lowering the lead holder 3 against the return spring 12 is installed on the intermediate beam plate 11b, and is operated by an arm 15 attached to the drive shaft 14 of the vertical solenoid 13. The lead holder 3 is lowered through the upper collar 3b.

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

That is, when the upper and lower solenoid 13 is energized, the drive shaft 14 is attracted and the arm 15 is lowered, thereby lowering the core holder 3 against the return spring 12 and entering the drawing state. When the upper and lower solenoids 13 are de-energized, the return spring 12
Then, the lead holder 3 rises and the drawing is stopped.

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

16 is a push rod whose lower end is inserted into the core hole 3a of the lead holder 3, and in order to prevent the push rod from falling off, a push rod drop-off prevention rubber 17 is provided on the intermediate beam plate 11c facing the intermediate beam plate 11b. There is.

A slider 18 moves up and down along a guide shaft 19 stretched between an independent beam plate 11e extending from the substrate 11 and an intermediate beam plate 11c.

Reference numeral 20 denotes a shaft bearing portion of the slider 18. A solenoid 22 is fixed in the case of the slider 18 via a support frame 21, and a pressure receiving plate 24 and a shaft bearing portion integrally formed at the base end of the drive shaft 23 are attached. A spring 25 is interposed between the spring 20 and the spring 20.

The tip of the drive shaft 23 is connected to a vertically divided end 26a of a vertically divided cylindrical chuck 26, as shown in FIG. 4, and the chuck 26 itself is fixed to a slider case, and the push rod 16 is inserted into the cylinder. There is.

Therefore, when the solenoid 22 is energized, the drive shaft 23 is attracted and the vertically split end 26a opens, and the push rod 16 is released from the chuck 26. When the solenoid 22 is deenergized, the vertically split end 26a is pressed by the spring 25. The inner diameter of the cylinder itself is reduced and the push rod 16 is clamped.

A flag 27 is provided at the upper end of the push rod 16, and a last sensor 28 for detecting this is provided on the independent beam plate 11e as shown in FIG.

Lower flange 2 protruding from the slider case
There is a writing pressure spring 30 between the intermediate beam plate 9 and the intermediate beam plate 11c.

Further, there is a pulley 37 on the shaft 36 of the motor 32 installed on the bracket 31 of the intermediate beam plate 11c, and one end is fixed to this pulley 37.
through the upper flange 4 of the slider case 18
It is attached to 0.

There is also a flag 41 on the belt 38,
An upper limit sensor 43 and a lower limit sensor 42 for detecting this are provided on the substrate 11.

The motor 32 is a DC motor with a detector whose rotational force can be adjusted freely, and is controlled by a controller (not shown).
33 is the motor 32
This shows the detector installed on the

Therefore, when the push rod 16 is pulled out from the lead holder 3 as will be described later, a strong current flows through the motor, a slight current flows during the drawing state, that is, when the pen is down, and when the drawing is stopped, that is, when the pen is up, a strong current flows through the motor. A current flows, and a rotational force corresponding to each state is applied to the motor in the upward direction, which is the direction in which the belt is wound around the pulley.

Since the core feeding mechanism is as described above,
During drawing, a weak current is applied to the motor 32 to apply a rotational force in the direction of winding the belt 38 with a force weaker than the tensile force of the pen pressure spring 30, and in this state, the pen pressure spring 30 moves the slider 18.
is pulled, and the push rod 16 is pulled through its chuck 26.
is applied downward to apply pressure to the lead.

As the core wears out, the slider 18
moves downward, and the belt 38 that has been wrapped around the pulley 37 is gradually pulled out from the pulley 37.

When drawing is stopped, that is, when the pen is up, the upper and lower solenoids 13 are de-energized, but an intermediate current flows through the motor 32 in response to a signal from the controller, counteracting the pen pressure spring 30, and as the lead holder 3 rises, the push rod 16 also rises, and the lead is not pushed out from the lead holder 3 by the push rod 16.

As the lead wears out, the belt 38 is pulled out from the pulley 37 and the flag 41 rises, which blocks the light beam from the emitter and receiver of the sensor 42, stopping the printing head drive device.At the same time, the motor 32 has a pen pressure spring. The belt 38 resists the spring force of 30.
A current strong enough to give the pulley 37 a rotational force that winds it around the pulley 37 is applied, and the belt 38 tries to wind back against the pen pressure spring 30.

At this time, the chuck dropout solenoid 22 is energized and opens the chuck 26 via its drive shaft 23.

Therefore, the slider 18 moves up leaving the push rod 16 behind, and when the flag 41 is detected by the upper limit sensor 43, an intermediate current is applied to the motor 32 by a signal from the controller to compete with the pen pressure spring 30. At the same time, the slider 18 stops, and the chuck detaching solenoid 22 is deenergized, causing the chuck 26 to be closed by the spring 25.

By the above-described operation, the clamping position of the chuck 26 with respect to the push rod 16 is changed, and the upper part of the push rod 16 is clamped by the chuck.

Thus, the image head drive is activated again.
At the same time, a slight current flows through the motor 32 in response to a signal from the controller, and the pen pressure spring 30 causes the push rod 16 to press the lead via the slider 18 against the weak rotational force.

When the flag 41 is detected by the lower limit sensor 42, the chuck clamp position is changed in the same manner as before.

When the lead is completely worn out, the flag 27 at the upper end of the push rod 16 is detected by the last sensor 28, and at the same time the printing head drive device stops and the motor 3
2 is given a strong current.

Then, since the chuck 26 remains closed, the slider 18 is raised by the belt 38, and the push rod 16 clamped thereto also rises, so that the push rod 16 is pulled out from the lead holder 3.

When the flag 41 is detected by the upper limit sensor 43, an intermediate current is applied to the motor 32 by a signal from the controller to compete with the pen pressure spring 30, and the push rod is pulled out and stopped at the position. While it is stopped, replenish the lead holder with a new lead.

Although the core feeding mechanism is configured as described above,
A wire or a toothed belt may be used instead of the belt 38. When a toothed belt is used, the pulley 37 becomes a toothed pulley.

The one in FIG. 6 shows a modified example of the chuck mechanism, in which a guide shaft 19 is fitted into the bearing portion 20 of the slider 18, and the slider 18 moves up and down along this guide shaft 19. There is no difference from the previous embodiment in that the writing pressure spring 30 and the belt 38 are attached to the flanges 29 and 40, respectively.

A leaf spring chuck 44 is used as the chuck mechanism.
6 is inserted, and one hem portion is directly fixed to the slider 18 case, while the other hem portion is attached to the drive shaft 48 of the chuck attachment/detachment solenoid 47.

Therefore, when the solenoid 47 is energized, the drive shaft 48 is pulled to widen the hem and open the holes 45 and 46.
moves away from the push rod 16 and the chuck is released,
On the other hand, when the excitation is released, the edges of the holes 45 and 46 are pressed against the push rod 16 by the elasticity of the leaf springs themselves, thereby completing the clamp.

The above embodiment is an example in which the push rod directly presses the lead in the lead holder, but as shown in Figs. The chuck mechanism described above may also be used for pressing.

That is, the same parts in Figures 7 and 8 as in Figures 3, 4, and 5 are given the same reference numerals;
The difference from the one shown is that a push pin holder mechanism is added.

Note that the slider 18 does not include a chuck mechanism.

Now, a push pin holder 51 provided with a vertical hole 50 for individually storing a large number of push pins 49 is slidably mounted on a holder receiver 52 provided on the lower surface of the intermediate beam plate 11c, and is equipped with a stepping pulse motor. The feed screw 54 of 53 is attached to the bracket 5 of the push pin holder 51.
By being screwed into 1a, the push pin holder 51 moves back and forth along the holder receiver 52.

The stepping pulse motor 53 is turned on by the upper limit sensor 43 mentioned above, that is, the push rod 16
When the push pin holder 51 is pulled up to the push rod guide 17, which is made of rubber to prevent the push rod from falling off, on the intermediate beam plate 11c, the stepping motor 53 is activated and feeds the push pin holder 51 by a certain amount to the vertical hole 5 into which the new push pin 49 is inserted.
0 to a position facing the core hole of the lead holder 3.

When the push pin holder 51 is moved by a certain amount, a slight current is applied to the motor 32 by a signal from the controller, and the push rod 16 presses the push pin 49 with the pen pressure spring 30 against the weak rotational force.

When all the push pins 49 of the push pin holder 51 are used, the last sensor 55 and a flag 56 provided at the front end of the push pin holder 51 detect the end position. Upon this detection, the stepping pulse motor 53 is reversed to return to the initial position.

Further, on the inner surface of the lower end of the vertical hole 50 of the push pin holder 51, there is a rubber core 51b for preventing the core from falling off.

As mentioned above, if a chuck mechanism as shown in FIGS. 3, 4, and 5 is applied to the slider of the embodiment shown in FIGS. 7 and 8, the length of the push rod 16 can be made short.

Now, to explain the specific operation of the embodiment shown in FIGS. 7 and 8, the upper and lower solenoids 13 are turned ON.
Then, the lead holder 3 is lowered by the arm 15 to transition to the drawing state, and drawing is performed while applying writing pressure to the lead by the writing pressure spring 30 via the push rod 16 and the push pin 49.

As the core wears out, the belt 38
Since a slight current flows through the motor 32 and a weak rotational force is applied, it is gradually pulled out from the pulley 37, and when the flag 41 is detected by the lower limit sensor 42, a strong current flows through the motor 32 and a strong rotational force is applied. As a result, the belt 38 is unwound against the pen pressure spring 30.

At this time, the chuck detaching solenoid 22 is energized and opens the chuck 26 via its drive shaft 23.

Therefore, the slider 18 rises leaving the push rod 16 behind, and when the flag 41 is detected by the upper limit sensor 43, an intermediate current flows through the motor 32, competing with the pen pressure spring 30, and the slider 18 stops. The chuck detachment solenoid 22 is de-energized and the spring 25 closes the chuck 26.

By the above-described operation, the clamping position of the chuck 26 with respect to the push rod 16 is changed, and the upper part of the push rod 16 is clamped by the chuck. In this way, the push rod 16 is moved to the slider 1 by the pen pressure spring 30 again.
8 to press the core.

When the flag 41 is detected by the lower limit sensor 42, the chuck clamp position is changed in the same manner as before.

When the push rod 16 is completely lowered, the flag 27 at the upper end of the push rod 16 is detected by the last sensor 28, and a strong current flows through the motor 32, giving it a strong rotational force.

Then, since the chuck 26 remains closed, the slider 18 is raised by the belt 38, and the push rod 16 clamped thereto also rises, so that the push rod 16 is pulled out from the lead holder 3.

When the flag 41 is detected by the upper limit sensor 43, an intermediate current flows through the motor 32 and competes with the pen pressure spring 30, so that the push rod 16 stops.

In this way, the stepping pulse motor 53 is turned on, and the push pin holder 51 is advanced, so that a new push pin 49 is opposed to the lead holder 3 position.

Next, the push rod 16 pushes the new push pin 49 using the pen pressure spring 30, and presses the lead a via the push pin in the previous lead holder.

By repeating the above operations, all the push pins 49 in the push pin holder 51 are inserted into the lead holder 3, and when the lead is completely consumed, the last sensor 55 detects the flag 56 and causes the motor 53 to reverse. to return the push pin holder 51 to its initial position.
The lead is taken out and refilled into the push pin holder 51, and the lead holder 3 is filled with a new lead.

In this case, the upper and lower solenoids 13 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 rods are raised upwards, and the push pins can be filled into the push pin holder. The push pin holder can be slid by a stepping mechanism in conjunction with the upper limit sensor.

In any case, the chuck mechanism on which the pen pressure spring acts can change its clamping position with respect to the push rod, so
For example, even if a long core is used, changes in writing pressure due to the writing pressure spring can be reduced.

Note that the push pin holder may be of a rotary type, and the lead holder mechanism and lead feeding mechanism are not limited to those shown in the drawings.

(Effects of the Invention) According to the present invention, writing pressure is constantly applied to the lead in the lead holder by the push rod, and the push rod descends as the lead wears out. The chuck device is operated by a pressure spring, and the push rod can be pressed down by changing the clamp position relative to the push rod, so the push rod can be made long to match the wear amount of the long core, and the chuck The clamp position can be changed depending on the device, so
It has the feature that the clamp position can be changed to a position where the writing pressure spring is held down to a certain length, and changes in writing pressure can be reduced.

[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, Figure 3 is a cutaway front view of the device of the present invention, Figure 4 is a cutaway plan view of the chuck mechanism, and Figure 5 is the motor part. 6 is a cutaway plan view showing a different chuck mechanism, and FIGS. 7 and 8 are a cutaway front view and a partial side view of the device of the present invention according to an embodiment different from that shown in FIG. 3, which includes a push pin holder. It is. 1... Drawing head, 3... Core holder, 12...
...Lead holder return spring, 13...Upper and lower solenoid, 15...Arm, 16...Push bar, 18...Slider, 26...Chick, 30...Pen pressure spring, 32...Motor, 38...Belt.

Claims (1)

[Claims] 1. A lead holder that moves up and down toward the drawing stop state and the drawing state, a push rod that presses the consumable writing lead in the lead holder toward the drawing board with a pen pressure spring, and a A drawing line for a drafting machine, which is composed of a chuck device that can change the clamping position with respect to the push rod by using the chuck, and a lifting device that works in conjunction with the chuck release device to change the clamping position of the chuck with respect to the push rod against the pen pressure spring. Device.