JPS62242594A - How to feed out the lead of a writing instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for feeding out the lead of a memorization tool used in an automatic drawing machine or the like.

Conventional automatic drawing machines draw lines, etc. on the recording paper by moving the memorization tool and the recording paper relative to each other. Insert the pipe so that it can move freely.
Sa lie no mMml-f-stbe M-nato I
) [there is.

In such writing instruments, if the impact when the lead is fed out and reaches the paper surface is large, the lead may break, or the lead chuck and lead may slide relative to each other, causing the lead chuck and lead to slide relative to each other. This may cause premature wear of the core chuck.

Conventionally, therefore, the lead is fed out slowly until it reaches the first page, or the lead is allowed to reach the page slowly to prevent breakage of the lead and wear of the lead chuck.

Problems to be Solved by the Invention As mentioned above, it is necessary to provide a position sensor or a speed sensor or to use a complicated control circuit to slowly feed out the lead or adjust the lead so that it reaches the paper surface slowly.

Means for solving the problem and operation The motor that lowers the core chuck is driven at predetermined time intervals for a minute period to lower the core chuck intermittently. It was made possible to reach.

Embodiment FIG. 4 is a schematic front view of a writing instrument for a drawing machine, and a writing instrument 2 is mounted on a base 1 that is moved in any direction by a moving mechanism (not shown).
In addition, the writing instrument 2 has a vibro slidably inserted into a cylindrical case 5, and a sleeve 7 is integrally attached to the upper part of the vibro that protrudes from the case 5. At the same time as attaching and inserting the core stock g, a cap 9 is detachably attached to the top of the core stock 8, and the case 5 or the holder 10 is used to attach the base I.
K holding and K.

The stopper 4 is located above the cap 9, and the sleeve 7
KPM, driven rollers l l and I +' are in pressure contact with each other to constitute the elevating mechanism 3.

The writing instrument 2 has a button shape 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. Diameter hole 2
2, a holding cylinder 25 is tightly fitted and fixed, and a core holding bushing 26 is inserted vertically movably between the holding cylinder 25 and the small diameter hole 23, and this core holding bushing 26 has an opening at the top. A slit 27 is formed so that the core can be deformed slightly in the radial direction, and the core entrance 26a has a funnel shape that expands upward, making it easier to insert the core, and the upper small diameter portion 26b
is biased by a coil spring 28 to an upper position where it fits into the opening 25a of the holding cylinder 25, and is movable against 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 vibro which is slidably inserted into the upper part of the case 5, and the inner peripheral surface 29
The 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 opened at the bottom and can be expanded and contracted in the radial direction with a diameter of 5Kt, and the upper part of the core chuck 30 is slidably inserted into the upper part of the vibro. A core insertion hole 33 drilled at the bottom of the core stock g opens concentrically with the core chuck 30, and the lower end surface of the chuck ring 29 and the core stock 8 A coil spring 34 is provided between the chuck ring 29 and the core chuck 30, and the chuck ring 29 and the core chuck 30 are biased in the direction of separation by the coil spring 34, and are brought into pressure contact with the steel ball 31 or the inner circumferential surface 29a- of the chuck ring 29. The core chuck 30 is designed to be compressed and deformed in the radial direction to firmly hold the core.

Next, the operation will be explained.

When the cap 9 is pressed while the drive roller 11 is stopped and the sleeve 7 is held, the core stock 6 slides downward along the vibro, and the core chuck 30 moves downward against the coil spring 34. The steel ball 31 is the chuck ring 29
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.

When the pressing force of the cap 9 is released in this state, the core chuck 30 is moved upward by the coil spring 34, and the steel balls 31 are pressed against the inner peripheral surface 29aK of the chuck ring 29, so that the core chuck 30 holds the core A.

When the drive roller 11 is rotated in the normal direction and the vibro is slid downward through the sleeve 7, the core chuck 30 moves downward together with the core stock 8, so the core A is also moved downward, and the core A
passes through the lead holding bushing 26 and protrudes downward from the lead insertion hole 24 of the lead guide 20. Therefore, by rotating the drive roller 11 in the normal direction, the leads A' are sequentially fed out, and the lower end surface of the vibro is aligned with the lead guide 20. When it comes into contact with the upper surface, the vibro stops descending and reaches the lowest position, and the feeding of the lead stops.

FIG. 2 is a schematic diagram of the core feeding device, in which the drive roller 11 is rotationally driven by a motor 40, and a control circuit 41 supplies current to the motor 40.

The control circuit 41 is as shown in FIG.
The side is connected to the motor 40 via the first and second switches 43 and 44.
One side input terminal 40. and the other side input terminal 402, respectively, and the - side is connected to the one side input terminal 401 and the other side input terminal 402, respectively, via the third and fourth switches 45 and 46. The four switches 43 and 46 are turned on by the output of the first AND gate 47, and the second and third switches 44°4
5 is designed to turn on at the output of the second AND gate 4g, and one side of the first AND gate 47 is connected to the CPU 4.
A descending command R1 is input from 9, and the second ant game) 4g
A rise command R2 is input from the CPU 49 to one of the gates, and a signal from the amplifier 50 is input to the other of the first and second AND gates 47 and 4g.

The CPU 49 has a current command circuit 51, and the current command circuit 51 outputs a digital signal to be outputted at a predetermined time interval for a minute amount of time to set the current to the D/A converter 52 as a current command signal. Amplifier 50 from converter 52
This analog signal is output as an analog signal to the current flow detected by the current detector 53. and comparator 54
The motors 40 & C are matched so that current is always supplied to the motors 40 & C based on the input analog signals.

The descending command salt and current command are output in synchronization with the drive signal of the automatic drafting machine, and the descending end detection signal of the sleeve 7, for example, the ON signal of the switch 55 provided in the case 5, is outputted to the CPU.
49, the lowering command It11 is prohibited and the higher command 9 continues to be output for a predetermined time, that is, until the sleeve 7 reaches the upper limit, and after that time, the higher command 9 is prohibited and the lowering command is output. be done.

Therefore, when the descending command salt and the current command are output, the first AND gate 47 outputs the output for a minute time at each time interval when the current command is output, and the first and fourth switches 43
．． 46 is ONt for that minute time, and the current flows to the motor 40.
From the input terminal 40x on one side to the input terminal 402 on the other side [
As shown in FIG. 3, the flow is carried out every 30 mg for a predetermined time, for example, 1.5 ms, and the motor 4o rotates at a predetermined time interval at the speed shown in FIG.
The sleeve 7 descends at each time interval at a speed commensurate with that speed, and the core A is fed out.

Therefore, the core A reaches the recording paper BK slowly.

Then, since the sleeve 7 further descends, holding pressure can be applied when drawing a line, etc. on the paper surface with the lead A, and when the sleeve 7 exceeds the lowering limit and the switch 55 is turned on, the descending command salt is prohibited and the ascending command is activated. is output, the second AND gate 48 outputs a signal, the second and third switches 44.45 are turned on, and the input terminal 401 on one side is connected to the input terminal 401 on the other side of the motor 40.
[Current flows and the motor 4o rotates in reverse, so the sleeve 7 rises.

When the sleeve 7 reaches its upper limit, the ascending command is inhibited and the descending command I- is output. Note that the time for the sleeve 7 to reach its upper limit may be calculated based on the rising distance and speed of the sleeve 7, or may be set in advance.

Note that the current command may continue to be outputted after the aforementioned core A reaches the paper surface, and the current command may also be continued to be outputted when the sleeve 7 is raised.

Alternatively, the current supplied to the motor 40 may be controlled by drive pulses without using the CPU.

In other words, the motor 4o may be driven for a minute period at predetermined time intervals to intermittently lower the core chuck 30 with sleep.

Effects of the Invention Since the core A is intermittently lowered and fed out for a minute period of time, the recording paper reaches its peak, and core breakage and abnormal wear of the core chuck 3o do not occur.

Furthermore, since it is sufficient to simply control the current supplied to the motor 4o, there is no need for a special sensor or a complicated control circuit, resulting in a simple and inexpensive structure.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; Fig. 1 is a schematic explanatory diagram of core feeding, Fig. 2 is a control circuit diagram, Fig. 3 is a chart showing the relationship between the current supplied to the motor and the speed, and Fig. 4 is a diagram showing the relationship between the current supplied to the motor and the speed. FIG. 5 is a detailed sectional view of the memorization implement, and FIG. 6 is an explanatory diagram of the lead feeding operation. 20 is a core guide, 30 is a core chuck, A is a core, B is a recording paper, and 40 is a motor.

Claims (1)

[Claims] In a writing instrument in which a lead chuck 30 holding a lead A with respect to a lead guide 20 is moved up and down by a motor 40 to feed out the lead A, the lead chuck 30 is moved by driving the motor 40 for a minute time at predetermined time intervals. A method for feeding out a lead of a writing instrument, characterized in that the lead A is fed out by descending intermittently.