JPH033438Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a push rod case in a drawing device for a drawing machine.

(Prior Art) Conventionally, a cartridge used in a drawing head for a drawing machine is composed of a pipe with an inner diameter that is the same as or slightly wider than the thickness of a pencil lead, and the pressurizing rod also fits within this pipe's inner diameter. was limited to.

(Problems to be Solved by the Invention) Therefore, if the core is thin, the pressure push rod will also be thin, and if the pressure push rod becomes long to correspond to the long core, there is a problem that it tends to bend.

(Means for Solving the Problem) Therefore, the object of the present invention is to obtain a drawing device for a drafting machine having a push rod case that can prevent the pressure push rod from bending. In the push rod case, at least one bushing capable of directly supporting the push rod is slidably fitted between at least two springs, and is configured to move as the core wears out. .

(Effect of the invention) The bush that supports the push rod in the case is sandwiched between the springs and moves as the core wears out to support the push rod, so when force is transmitted from the pressure means, the push rod deflection or bending of the push rod is prevented.

(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 configured to be controlled to move in a predetermined direction within a plane parallel to the upper surface of the drawing board 2.

3 is a lead holder that moves up and down with respect to the drawing head, and a consumable writing lead, such as a pencil lead a, is supplied to this lead hole 3a, and a lead holder is provided to prevent the supplied lead a from falling out of the lead holder. , Core fall prevention rubber 4
is provided at the lower end of the core hole 3a.

The core holder 3 includes a lower beam plate 5a extending from the substrate 5 of the printing head 1, and an intermediate beam plate 5b.
It is strung between.

A lead holder return spring 6 biased upward is interposed between the intermediate beam plate 5b and the upper collar 3b of the lead holder 3.

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 holder 3 is lowered.

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

That is, when the upper and lower solenoid 7 is energized, the drive shaft 8 is attracted and the arm 9 is lowered, whereby the lead holder 3 is lowered against the return spring 6 to enter 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 lead holder 3 as described above will be explained.

A push rod case 10 is attached to the intermediate beam plate 5c that faces the intermediate beam plate 5b protruding from the substrate 5, and a push rod 11 that presses the core in the lead holder 3 is press-fitted and adhered to a slider 17 that moves up and down within the case 10. ing. a bush 12 that supports the push rod 11;
13 and 14 are slidably provided within the case 10, and springs 15 and 16 are located between these bushes. Here, the bushes 12 and 14 may be omitted.

Reference numeral 18 denotes a slit groove formed in the vertical direction of the case 10, and is a slit groove formed in the vertical direction of the case 10.
moves up and down in this slit groove 18.

19 is a cap fitted onto the case 10.

Arm 17a of slider 17 and intermediate beam plate 5c
A pen pressure spring 29 as a pressure means is stretched between the two, and a pulley 21 is provided on the shaft 22 of a motor 28 installed on a bracket 27 of the intermediate beam plate 5c, to which one end is fixed. , the belt 23 wound around this pulley 21 is attached to the pulley 2 of the upper beam plate 5b.
0 to the arm 17a of the slider 17. The motor 28 is a DC motor with a detector whose rotational force is adjustable, and the rotational force of this motor in the winding direction of the belt into the pulley, that is, the upward direction, is controlled by a controller (not shown).

There is also a flag 24 on the belt 23,
This blocks the light beams from the emitter and receiver at the upper limit sensor 26 and lower limit sensor 25.

Since the core feeding mechanism is as described above,
During drawing, the motor 28 applies the belt 23 to the pulley 21 with a force weaker than the tensile force of the pen pressure spring 29.
A weak current is applied to apply a rotational force in the direction that should involve the pen pressure spring 2, and in this state, the pen pressure spring 2
At 9, the slider 17 is pulled to force the push rod 11 downward, and the push rod 11 applies downward pressure to the lead a in the lead holder 3 to apply writing pressure.

When drawing is stopped when the upper and lower solenoids are de-energized, an intermediate current is applied to the motor 28 by a signal from the controller, so the pen pressure spring 29
The rotational forces of the motor 28 are balanced against each other, so that the lead holder 3 is not pushed out by the push rod 11 as it rises.

Then, as the core wears out, the slider 17
is lowered, and the belt 23 that has been wrapped around the pulley 21 is gradually pulled out from the pulley 21.

Then, the flag 24 rises and blocks the light beam from the lower limit sensor 25, which means that the lead has been worn out.The writing head drive device stops, and at the same time, the motor 28 is forced into the belt against the spring force of the pen pressure spring 29. A current strong enough to give the pulley 21 a rotational force that winds the belt 23 into the pulley 21 is applied, and the belt 23 is rewound against the pen pressure spring 29.

When the belt 23 is rewound and the push rod 11 is pulled up, and the push rod 11 is pulled out from the lead holder 3, the flag 24 blocks the light beam of the upper limit sensor 26 in this state, and the motor 28 receives the weak current as described above.

Then, when the motor 28 receives the above-mentioned weak current, the drawing head drive device operates again, and the writing pressure is applied to the lead of the lead holder 3 by the writing pressure spring 29, but in this case, of course, the solenoid 7 is turned on. The lead holder 3 is lowered by the arm 9 against the return spring 6 and is in the drawing state, that is, the pen-down state, but when the strong current is applied to the motor 28, the upper and lower solenoids 7 are turned off. Then, the lead holder 3 is raised by the return spring 6 and is in the drawing stop state, that is, the pen-up state, so after the push rod 11 is pulled out as described above, a new lead a is replenished into the lead holder 3. Then, the core feed mechanism is activated again and the drawing operation begins.

Although the core feeding mechanism is configured as described above, a wire may be used instead of the belt 23, or a toothed belt may be used. When a toothed belt is used, the pulley 20 becomes a toothed pulley.

As described above, the printing head 1 consists of a core holder mechanism and a core feeding mechanism, which is used for the X cursor that moves in the X-axis direction along the vertical rail 31 on the base 30, as shown in FIG. 32, 32 and this X
Horizontal rail 33 stretched between cursors 32 and 32
The drawing machine is provided with a Y cursor 34 that moves in the Y-axis direction along the drawing machine.

The illustrated one has a plurality of print heads 1 installed side by side. Therefore, when the core of one print head 1' is worn out, the core of the next print head 1'' can be used, allowing continuous drawing.

As described above, the push rod case 10 of the drawing machine is equipped with the push rods 12, 13, and 14 in a slidable manner, so that as the lead a wears out, the push rod lowers while applying writing pressure to the lead a. , the bush supported by a spring moves while supporting the push rod 11.

Therefore, the push rod does not bend or bend, and even if the lead a is a long lead, sufficient writing pressure can be applied.

It should be noted that the number of bushes may be one, and the pen up-down mechanism and the core feeding mechanism having a pressure means are not limited to those shown in the drawings.

[Brief explanation of the drawing]

Figures 1 and 2 are a perspective view of the entire drawing machine and a partial perspective view of the cursor section. FIG. 3 is a sectional view of the proposed device. FIG. 4 is a side view of the motor section. 3... Core holder 3, 10... Push rod case, 1
2, 13, 14...button, 15, 16...spring, 17...slider, 29...pen pressure spring.

Claims (1)

[Scope of utility model registration request] In a push rod case that holds a push rod for pressurizing the consumable writing lead in the lead holder in the direction of the drawing board, at least one bushing capable of directly supporting the push rod is located between at least two springs. A push rod case in a drawing device for a drafting machine, which is slidably fitted in a sandwiched manner and is configured to move as the lead wears out.