JPH0425360Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Use The present invention relates to a writing instrument in which the lead of a pencil is drawn out sequentially.

Conventional technology A core guide is provided at the tip of the cylindrical case, and the case
A core stock equipped with a core chuck is movably provided in the base, and when the core stock is pushed, the core held by the core chuck is moved toward the core guide.
A writing instrument is known in which a lead chuck releases the lead and returns to its original position by a spring when the lead chuck moves a predetermined stroke.

Problems that the invention aims to solve With such a writing instrument, the leads can be fed out one by one by pushing the lead stock, but in order to eject the short lead remaining in the lead guide, the so-called residual lead, it is necessary to remove the lead from the lead stock. New cores are fed out one after another and come into contact with the remaining core, and then new leads are fed out one after another and ejected from the lead guide, so the lead stock has to be pushed many times, making the remaining core ejection operation very troublesome. At the same time, it takes a long time.

Means and action for solving the problem: A cylindrical case with a core guide at one end, a stopper at the other end, a chuck ring at one end of the pipe inserted into the case,
A locking piece that interferes with the stopper is provided in the intermediate part,
A coil spring installed in the case urges the pipe to protrude, and the locking piece interferes with the stopper to regulate the protruding position, and a core stock with a core chuck is slidably inserted into the pipe. By installing a coil spring between the core stock and the chuck ring to maintain the core chuck in a position where the chuck ring holds the core, the pipe can be pushed into the case to feed out the core, and the core stock can be When the pipe is made to protrude further than the predetermined protruding position by holding it, the core chuck will release the core, and the coil spring installed inside the case will interfere with the stopper to hold the pipe in the protruding position. This prevents it from slipping out of the case.

Embodiment A core guide 20 is attached to the tip of the cylindrical case 5, and the 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 large diameter hole 22, and a bush 26 is inserted vertically movably between the inside of the holding cylinder 25 and the small diameter hole 23. A core holding bush 27 made of rubber is fitted inside 26a, and
The hole 27a is concentric with the core inlet 25a of the holding tube 25, and the core inlet 25a and the hole 27a are shaped like a funnel that expands upward, making it easy to insert the core. It is biased by a coil spring 28 to an upper position where it abuts the upper part of the small diameter hole 25, and is movable through the coil spring 28 to a lower position where it abuts the bottom of the small diameter hole 23.

A chuck ring 29 is fitted and fixed to the lower part of the pipe 6 which is slidably inserted into the case 5, and the inner circumferential surface 29a thereof has a tapered shape that expands downward, and the inner circumferential surface 29a of the chuck ring 29 has a tapered shape that expands downward. A steel ball 31 fitted into the lower outer peripheral surface is in contact with the inner peripheral 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 drilled in the bottom 8a of the core stock 8 opens concentrically to the core chuck 30, and the chuck ring 29 and the core stock 8 A coil spring 34 is provided across the lower end surface, and the chuck ring 29 and the core chuck 30 are biased in the direction of separation by the coil spring 34, and the steel balls 31 are pressed against the inner circumferential surface 29a of the chuck ring 29, so that the core The chuck 30 is radially compressed and deformed to firmly hold the core, and the core stock 8
A cap 9 is detachably attached to the upper part of the cap 9 so that the core can be replenished into the core stock 8.

In addition, a core guide 35 is provided at the top of the core chuck 30.
When the cores are fitted together, the cores falling from the core insertion hole 33 are guided so that they fall correctly into the core inlet 25a of the holding tube 25.

The case 5 has a lower small diameter portion 5a and an upper large diameter portion 5.
The lower part of the pipe 6 is slidably fitted into the lower small diameter part 5a, and an annular space 36 is formed between the upper large diameter part 5b and the pipe 6, A ring-shaped locking piece 37 fixed to the ring 6 is slidable along the annular space 36, and this locking piece 37 is a ring screwed or press-fitted into the open end of the upper large diameter portion 5b with a coil spring 38. The sleeve 7, which is urged upward until it comes into contact with a stopper 39 shaped like the shape, and which is fixed to the portion of the pipe 6 that protrudes from the case 5, is always kept at a constant position.

Next, the operation will be explained.

When the cap 9 is pushed while the case 5 and sleeve 7 are held in hand, the core stock 8 slides downward along the pipe 6 and the coil spring 3
4, the lead chuck 30 moves downward and the steel balls 31 move away from the inner circumferential surface 29a of the chuck ring 29 and expand in the radial direction. It is inserted and falls to the lead inlet 27a of the lead holding bush 27.

When the pushing force of the cap 9 is released in this state, the core chuck 32 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. .

Holding the case 5 by hand, insert the pipe 6 into the coil spring 38 through the sleeve 7 to remove the case 5.
When it is pushed in and slid, the lead chuck 30 moves downward together with the lead stock 8, so the lead A is also moved downward, and the lead A passes through the lead holding bush 27 and moves downward from the lead insertion hole 24 of the lead guide 20. Since the pipe 6 protrudes, by pushing the pipe 6 one after another, the core A is drawn out one by one, and when the lower end surface of the pipe 6 comes into contact with the upper surface of the core guide 20, the pushing of the pipe 6 stops and reaches the most pushed-in position. Lead feeding stops.

Also, when the pushing force of the pipe 6 is released, the pipe 6
is slid by the coil spring 38 through the sleeve 7 to a predetermined protruding position. At this time, core A
Since the core chuck 30 is held by the core holding bush 27, the core chuck 30 expands in the radial direction and loses its holding force on the core A, and the core chuck 30 is moved together with the core stock 8 by the pipe 6 via the coil spring 34. Because of the upward movement, the lead A only moves upward a small distance as the lead retaining bushing 27 is moved by the coil spring 28 from the lower position to the upper position.

Then, by pushing the pipe 6 again, the core A can be drawn out in the same manner as described above.

In this way, by sliding the pipe 6 from the predetermined protruding position to the most pushed-in position, the core A can be continuously fed out one after another, and the length of the core fed out by one pushing operation can be made sufficiently long. Core guide 20
The length of the core protruding from the core insertion hole 24 can be adjusted as desired, and the core length can be adjusted to suit the purpose.

Furthermore, when the lead A passes through the lead holding bush 27, the lead holding bush 27 slides together with the bush 26 against the coil spring 28 to the lower position as shown in FIG. When the pushing is stopped and the pipe 6 is pulled up, the lead holding bush 27 slides together with the bush 26 by the coil spring 28 to the upper position shown in FIG. Since the lead guide 20 does not move up and down, the lead guide 20 of the lead A can be brought sufficiently close to the paper R when used as a writing instrument for a drafting machine, for example.
Since the protruding length of the twist can be shortened, the core A will not break.

In other words, the core holding force of the core holding bush 27 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 27 moves upward by the coil spring 28, and allows the lead chuck 34 to move upward against the coil spring 30. It is becoming.

Also, as shown in FIG. 3, when the core A becomes shorter and the coil spring 38 slides the pipe 6 to a predetermined protruding position, the core A becomes farther away from the core chuck 30 as shown in FIG. When a short lead is held in the holder 20 and the remaining lead A' is in a state of remaining lead, it is necessary to discharge the remaining lead A'.

In this case, hold the case 5 and sleeve 7 in the same manner as described above, push the cap 9, move the core stock 8 downward, cause the core chuck 30 to protrude downward relative to the chuck ring 29, and then remove the core chuck 30.
loses its core holding force, and the new core A'' falls under its own weight and hits the top of the remaining core A' as shown in Figure 5.

When the pipe 6 is pushed through the sleeve 7 in this state, the new core A'' is moved downward, and the remaining core A' is discharged from the core holder 20.

In addition, the pipe 6 is slidably held in a predetermined protruding position by a coil spring 38, and the coil spring 38 is provided inside the case 5, so the overall structure can be made compact and the writing instrument has a good appearance. Become.

Also, when used as a writing instrument for a drawing machine,
As shown in FIG. 6, the upper and lower flanges 4 of the case 5
Attach the part between 0 and 41 to the main body 42 of the automatic drafting machine, engage the fork 43 that moves up and down with the small diameter part 7a of the sleeve 7, and use the fork 43 to draw the pipe 6.
The main body 42 is further provided with a stopper 44 facing the cap 9, and when the pipe 6 is further raised after the cap 9 contacts the stopper 44, the core stock 8 is stopped and only the pipe 6 is raised. The core chuck 30 may be opened.

Furthermore, when attached to a drafting machine, the main body 5 and the pipe 6 are always integrated without being separated, so it can be attached to a normal solenoid-controlled drive device, and the pipe 6 is always held in a predetermined protrusion by the coil spring 38. Since the position of the sleeve 7 is always kept constant by being biased to a certain position, it is possible to automatically change the writing instrument.

In other words, a plurality of writing instruments are arranged side by side in the stocker of the drawing machine, and the sleeve 7 of this writing instrument is inserted with the fork 43.
When replacing the writing instrument by grasping the small diameter portion 7a of the sleeve 7a and removing it from the stocker and attaching a new writing instrument to the main body 42, since the position of the sleeve 7 is always constant, it is easy to grasp it with the fork 43. It can be done smoothly and the exchange of writing instruments can be automated.

Effects of the invention By pushing the pipe 6 into the case 5 and operating it, the core can be continuously and sequentially fed out from the core guide 20.

Further, when the case 5 and the pipe 6 are held so as not to move and the core stock 8 is pushed in, the core stock 8 and the chuck ring 29 move toward each other against the coil spring 34, and the chuck 30 holds the core. is released and the new core falls until it touches the upper part of the remaining core remaining in the core guide 20. In this state, when the pipe 6 is pushed into the case 5, the new core continuously pushes out the remaining core and the core is removed. Since it can be discharged from the guide 20, the remaining core can be discharged without pushing the core stock many times as in the conventional method, and the remaining core can be discharged easily and in a short time.

Further, since the pipe 6 is held at a predetermined protruding position where the locking piece 37 comes into contact with the stopper 39 by a coil spring 38 provided in the case 5, the pipe 6 does not slip out from the case 5, and
The overall design is compact and has a good appearance, making it a writing instrument that is easy to hold and operate.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view of the writing instrument, FIG.
4 and 5 are explanatory diagrams of the remaining core ejection operation, and FIG. 6 is a schematic diagram of the device installed in a drafting machine. 5 is the case, 6 is the pipe, 8 is the core stock, 2
0 is a core guide, 29 is a chuck ring, 30 is a core chuck, 34 is a coil spring, 37 is a locking piece, 38 is a coil spring, and 39 is a stopper.

Claims (1)

[Scope of utility model registration request] A core guide 20 is attached to one end of the cylindrical case 5, a stopper 39 is provided at the other end, a pipe 6 is slidably inserted into the case 5, and a chuck ring 29 is attached to one end of the pipe 6. and the pipe 6 interferes with the stopper 39 in the intermediate part.
The locking piece 3 that restricts the position of protruding from the case 5
7 and a coil spring 38 for slidingly biasing the pipe 6 to the projecting position in the case 5, and a core stock 8 having a core chuck 30 is slidably inserted into the pipe 6, This writing instrument is characterized in that a coil spring 34 is attached between the lead stock 8 and the chuck ring 29 to maintain the lead chuck 30 in a position where the lead is held by the chuck ring 29.