JPH0340638Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a writing device used in a drawing machine.

BACKGROUND OF THE INVENTION As shown in Japanese Patent Publication No. 57-36879 and Japanese Utility Model Publication No. 57-5193, there are known drafting writing devices that automatically feed out pencil leads in sequence.

Problems to be Solved by the Invention Since such a writing device for a drawing machine does not have a special mechanism for ejecting the shortened remaining lead, in order to eject the remaining lead, the remaining lead must be replaced with a new one using a normal lead feeding operation. The only way to remove it is to press it with a special wick, and ejecting the remaining wick is troublesome and takes a long time.

Means and action for solving the problem A case equipped with a core guide is attached to a base, a pipe to which a chuck ring is fixed is inserted into the case so as to be slidable up and down, and a core chuck is inserted into the pipe. A core stock provided thereon is slidably inserted, a coil spring is provided between the core stock and the chuck ring, the core stock is biased and held in a position where it is contracted and deformed in the radial direction by the chuck ring, and the core stock is attached to the base. is equipped with an elevating mechanism that moves the pipe up and down and a stopper that restricts the upward movement of the lead stock, and by moving the pipe up and down with the elevating mechanism, the lead can be fed out sequentially, and the lead stock can be brought into contact with the stopper. When the pipe is moved further upward than its original position, the core chuck expands and deforms in the radial direction so that a new core comes into contact with the remaining core.

Embodiment FIG. 2 is a schematic front view of a writing device for a drafting machine. A base 1 that is moved in any direction by a moving mechanism (not shown) includes a writing instrument 2, a lifting mechanism 3, and a stopper 4.
In addition, the writing instrument 2 has a pipe 6 slidably inserted into a cylindrical case 5, a sleeve 7 is integrally attached to the upper part of the pipe 6 protruding from the case 5, and a core is provided. In addition to inserting the stock 8, a cap 9 is detachably attached to the upper part of the core stock 8, and the case 5 is attached to the holder 1.
A stopper 4 is located above the cap 9, and driving and driven rollers 11 and 11' are pressed against the sleeve 7 to form an elevating mechanism 3.

The writing instrument 2 is designed as shown in FIG.

That is, a core guide 20 is attached to the tip of the case 5, and this core guide 20 has a large diameter hole 22, a small diameter hole 23, and a core insertion hole 24 formed continuously and concentrically. A holding cylinder 25 is tightly fitted and fixed in the diameter hole 22, and there is a connection between the inside of the holding cylinder 25 and the small diameter hole 22.
The lead holding bush 26 is inserted so as to be able to move up and down, and the lead holding bush 26 is formed with a slit 27 that is open at the top so that it can be slightly deformed in the radial direction, and the lead inlet 26a is expanded upward. The upper small diameter part 26b is biased by the coil spring 28 to the upper position where it fits into the opening 25a of the holding cylinder 25, and the core is shaped like a funnel so that it is easy to insert the core. It is arranged so that it can move against the coil spring 28 to the lower position where it comes into contact.

A pipe 6 slidably inserted into the upper part of the case 5
A chuck ring 29 is fitted and fixed to the lower part of the
The inner circumferential surface 29a has a tapered shape expanding downward, and a steel ball 31 fitted into the lower outer circumferential surface of the core chuck 30 is in contact with the inner circumferential surface 29a.

The core chuck 30 is formed with a slit 32 opening at the bottom so that it can expand and contract in the radial direction, and the upper part of the core chuck 30 is slidably inserted into the upper part of the pipe 6. A core insertion hole 33 formed in the bottom 8a of the core stock 8 is opened concentrically with the core chuck 30, and the chuck ring 29 and the bottom of the core stock 8 are fitted and fixed to each other. A coil spring 34 is provided across the end face, and the chuck ring 29 and the core chuck 30 are connected to the coil spring 3.
4, the steel balls 31 come into pressure contact with the inner circumferential surface 29a of the chuck ring 29, so that the core chuck 30 shrinks and deforms in the radial direction to firmly hold the core.

Next, the operation will be explained.

When the cap 9 is pushed while the drive roller 11 is stopped and the sleeve 7 is held, the core stock 8 slides downward along the pipe 6, and the core chuck 30 moves downward against the coil spring 34. Since the steel ball 31 moves away from the inner peripheral surface 29a of the chuck ring 29 and expands in the radial direction, the pencil lead A in the lead stock 8 passes through the lead chuck 30 and falls to the lead inlet 26a of the lead holding bush 26. do.

When the pushing force of the cap 9 is released in this state, the core chuck 30 is moved upward by the coil spring 34, the steel ball 31 comes into pressure contact with the inner peripheral surface 29a of the chuck ring 29, and the core chuck 30 holds the core A. .

When the drive roller 11 is rotated in the normal direction and the pipe 6 is slid downward through the sleeve 7, the core chuck 30 moves downward together with the core stock 8, so that the core A is also moved downward, and the core A is moved downward from the core holding bush 26. , and protrudes downward from the core insertion hole 24 of the core guide 20, so that by rotating the drive roller 11 in the normal direction, the cores A are sequentially fed out, and when the lower end surface of the pipe 6 comes into contact with the upper surface of the core guide 20. The pipe 6 stops descending to the lowest position, and the feeding of the core stops.

In this way, by sliding the pipe 6 from a predetermined upper position to the lowermost position, the cores A can be sequentially fed out, and the length of one centering operation can be made sufficiently long, so the base 1 can be moved. When drawing lines on paper B, long lines can be drawn continuously, and the frequency of separating lines can be greatly reduced.

Further, when the lead A passes through the lead holding bush 26, the lead holding bush 26 slides to a downward position as shown in FIG. 3 against the coil spring 28, and stops the drive roller 11 in the middle of feeding out the lead. Then, when the drive roller 11 is reversed, the core holding bush 26 slides to the upper position shown in FIG.
0, the core guide 20 does not move up and down, so the core guide 20 can be brought sufficiently close to the paper B, and the protruding length of the core A from the core guide 20 can be shortened, so that the core A does not break. There is no.

In other words, the core holding force of the core holding bush 26 is the core A
This not only prevents the lead chuck from falling due to its own weight, but also holds the lead A even when the lead holding bush 26 moves upward by the coil spring 28, and allows the lead chuck 30 to move upward against the coil spring 34. It is becoming.

When the above-mentioned one-time feeding of the core is completed, the drive roller 11 is reversely rotated to slide the pipe 6 upward through the sleeve 7. At this time, the core A is attached to the core holding bush 2.
6, the core chuck 30 expands and deforms in the radial direction, and the holding force of the core A is lost, and the core chuck 30 moves upward along with the core stock 8 by the pipe 6 via the coil spring 34. Therefore, the lead A moves upward only by a small distance that the lead holding bush 26 moves from the lower position to the upper position by the coil spring 28.

Then, by rotating the drive roller 11 in the normal direction again, the core A can be fed out in the same manner as described above.

Also, as shown in FIG. 4, when the core A becomes shorter and the drive roller 11 is reversed to slide the pipe 6 to a predetermined upper position, the core A becomes shorter as shown in FIG.
When the short lead A' is separated from the lead chuck 30 and a short lead is held in the lead holder 20, it is necessary to discharge the remaining lead A'.

In this case, the remaining core state is detected by some electrical means, and the drive roller 11 is further reversed in response to the detection signal to slide the pipe 6 further above the predetermined upper position when normally feeding the core. .

As a result, the cap 9 comes into contact with the stopper 4, making it impossible for the core stock 8 and the core chuck 30 to move upward, and when the pipe 6 is further moved upward, the chuck ring 29 moves upward against the coil spring 34. The steel ball 31 is on the inner peripheral surface 29a
As the lead chuck 30 loses its holding power, the new lead A'' falls due to its own weight and hits the upper part of the remaining lead A' as shown in FIG.

In this state, the drive roller 11 is rotated forward and the pipe 6 is
When the lead holder 20 is slid downward, the new lead A'' is moved downward, and the remaining lead A' is ejected from the lead holder 20.

Effects of the invention: By moving the pipe 6 up and down with the elevating mechanism 3, the leads can be drawn out one by one, so it can be used as a writing instrument for a drafting machine.

Also, the pipe 6 is connected to the core stock 8 by the stopper 4.
When the core stock 8 and the chuck ring 29 move toward each other against the coil spring 34, the core chuck 30 expands and deforms in the radial direction. It falls until it touches the upper part of the remaining core remaining on the guide 20, and when the pipe 6 is moved downward in this state, the new core continuously pushes out the remaining core and the core guide 20
Since the remaining core can be discharged more easily, the remaining core can be discharged easily and in a short time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a sectional view of the writing instrument, Fig. 2 is an overall view, Fig. 3 is a sectional view of the lead in the drawn-out state, and Fig. 4, Fig. 5, and Fig. 6 are FIG. 6 is an explanatory diagram of the operation for discharging the remaining core. 1 is a base, 3 is a lifting mechanism, 4 is a stopper, 5
is a case, 6 is a pipe, 8 is a core stock, 20 is a core guide, 29 is a chuck ring, 30 is a core chuck, and 34 is a coil spring.

Claims (1)

[Scope of utility model registration request] A core guide 20 is attached to the lower end of the case 5 fixed to the base 1, and a pipe 6 is fitted into the case 5 so as to be slidable up and down, and a chuck ring 29 is fixed to the lower end of the pipe 6. A core stock 8 slidably inserted into the pipe 6
A core chuck 30 that expands and contracts in the radial direction is fixed to the lower end, and a coil spring 34 that extends and contracts the core chuck 30 in the radial direction by the chuck ring 29 is attached to the chuck ring 29 and the core stock 8. A writing device for a drafting machine, characterized in that the base plate 1 is further provided with an elevating mechanism 3 for moving the pipe 6 up and down, and a stopper 4 for regulating the upward movement of the lead stock 8.