JPS62280091A - Writing device - 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 1. Detailed Description of the Invention Field of Industrial Application The present invention relates to a writing device used in an automatic drafting machine.

BACKGROUND OF THE INVENTION As shown in Japanese Patent Application Laid-Open No. 56-109796, a writing device is known in which the lead is fed out by changing the lead clamping position using a lead chuck mechanism in a lead holder.

Problems to be Solved by the Invention With such a writing device, when the lead becomes short and becomes unusable, it is necessary to remove the short lead, that is, the residue, and replace it with a new lead. To do this, manually release the core chuck mechanism to make the core free, remove it from the core pressure spring holder that is the protective pipe, pull out the 8-pressure large cylinder with the protective pipe, and remove and discharge the core pressure spring. , I pushed in a new core and reattached the protective pipe.

For this reason, the operation of discharging the residue and replacing it with a new core becomes extremely troublesome.

Means for solving the problem and operation A core stock equipped with a core chuck constituting a core chuck mechanism is inserted into a pipe that moves up and down by a motor, and the rise of this pipe is regulated with a weak force at an intermediate position, and a means for detecting the lowest point of the one-core chuck while providing a stopper for regulating the maximum rising position of the core stock with a strong force;
Based on this detection signal, a controller is provided that outputs a normal operation command with a weak torque and a core replacement operation command with a strong torque to the motor, and also detects the residue state. The device automatically discharges the core and replaces it with a new one.

Embodiment FIG. 2 is a schematic front view of a writing device for a drawing machine, in which a base 1 that can be moved in any direction by a moving mechanism (not shown) is provided with a writing instrument 2, a lifting mechanism 3, and a stopper 4. , 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 stock 8 is fitted and inserted. A cap 9 is removably attached to the upper part of the core stock 8, and the case 5 holds the base IK with a holder 10, and a stopper 4 is located above the cap 9, and the sleeve 7 is driven and Followed roller I
, l1' are pressed against each other to form the elevating mechanism 3.

The writing instrument 2 is 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
A holding cylinder 25 is tightly fitted and fixed in the holding cylinder 2, and a core holding bushing 26 is inserted vertically movably between the holding cylinder 25 and the small diameter hole 22, and this core holding bushing 26IC is opened at the top. A slit 27 is formed so that the core can be slightly deformed in the radial direction, and the core inlet 26a is shaped like a funnel that expands upward, making it easier to insert the core.
The coil spring IJ 7 is biased by the coil spring 28 to an upper position where it fits into the opening 25a of the holding cylinder 25, and can be moved against the coil spring 28 to a lower position where it abuts the bottom of the small diameter hole 23. be.

A chuck ring 29 is fitted and fixed to the lower part of the pipe 6 which is slidably inserted into the upper part of the case 5, and the inner peripheral surface 29
A is widened downward and has a tapered shape, 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. This constitutes a core chuck mechanism.

The core chuck 30 has a slit 32 opened 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 3 is fitted and fixed to the lower part of the cylindrical core stock 8 and is bored in the bottom 88 of the core stock 8.
3 opens concentrically to the core chuck 30, and a coil spring 34 is provided across the chuck ring 29 and the lower end surface of the core stock 8.
The core chuck 30 is biased in the direction of separation by the coil spring 34, and the steel balls 31 press against the inner circumferential surface 29a of the chuck ring 29, so the core chuck 30 shrinks and deforms in the radial direction to strengthen the core. Press to hold.

The stopper 4 has a downward U-shape with both side pieces 40, 40 and a horizontal piece 41, and the lower surface 40a of both side pieces 400 is opposed to the slope 7'a1 of the large diameter upper part 7a of the sleeve 7, that is, the locking part of the pipe 6. At the same time, the cap 9 comes to face between the both side pieces 40, and the lower surface 40a of the both side pieces 40 is on the slope 7/
When the cap 9 and the horizontal pieces 41 come into contact with a, the cap 9 and the horizontal pieces 41 are slightly separated, and when the vibro rises further, the both side pieces 40 expand.

The driving and driven rollers l I and l +' have a binion shape and mesh with the rack teeth 7b of the sleeve 7, and the first driving roller 11 is driven by a small DC motor MK, so that the core chuck 3o is lowered to the lowest position. When it descends to this point, the switch 5o is turned on.

The motor M is busy when forward rotation, reverse rotation, and drive torque are controlled by control signals from the controller 6o, and the controller 6o outputs control signals to the motor M in a predetermined sequence according to the ON and OFF signals of the switch 50. do.

Next, the operation will be explained.

When the power is turned on and a drawing command is input, a normal rotation signal is sent from the controller 60 to the motor M as a normal operation command, and the motor M rotates in the normal direction, as shown in FIG. 3(a).

As shown in (b), the lead chuck 30 is lowered together with the vibrator through the sleeve 7 to cause the lead A to protrude from the lead holder 20 and come into contact with the paper B to draw.

At this time, a current of a magnitude is supplied to the motor M to generate a torque sufficient to obtain a pressing force, or a voltage, to the paper B having a core A of a predetermined size.

When drawing, the lead A decreases and the lead chuck 30 gradually descends,
As shown in FIG. 3(C), when the lowest point is reached, the switch 50 is turned on.

When the ON signal of this switch 50 is input to the controller 60, a reverse rotation signal and a weak torque signal (that is, low current) are sent to the motor M for a certain period of time, the motor is reversed with a weak torque, and the sleeve 7 and pipe 6 are rotated. The chuck ring 29 rises via the coil spring 34, and the core chuck 30 continues to rise for a certain period of time via the coil spring 34.

As a result, as shown in FIG. 3(d), the slope 7/a of the sleeve 7 comes into contact with the lower surface 40a of both sides of the stopper 40, and since the torque of the motor M is small, the slope 7'a of the sleeve 7
The lead chuck 30 stops at the intermediate position because the both side pieces 40 cannot be expanded, and the lead chuck 30 again holds the position above the previously held position, that is, re-grips the lead.

Incidentally, when the lead chuck 30 rises, the lead A is held by the lead holding bush 26 of the lead guide 20 and does not rise, but the lead chuck 30 moves up with the lead A K G.

The holding force of the lead A of the lead chuck 30 based on the force in the direction of separating the chuck ring 29 and the lead chuck 30 by the coil springs 34&C is slightly smaller than the holding force of the lead holding bush 26.

When the core chuck 30 stops at the aforementioned intermediate position for a certain period of time, a normal rotation signal is sent from the controller 60 to the motor M, and the motor M rotates in the normal direction, and the core chuck 30 descends in the same way as described above. The lead A is further lowered by the amount that the lead A is held at a position above the lead holding position.

If you repeat the above-mentioned re-grip operation several times, the result will be as shown in Figure 4 (
As shown in a), even when the lowest point is reached, the lead cannot be reattached, and in this case, it is necessary to replace the lead with a new one.

Therefore, the time it takes for the core chuck 30 to start descending from the intermediate position and the switch 50 to turn ONt, rise to the intermediate position, descend again, and turn the switch 50 ON, that is, the time it takes for the switch 5o to turn ON twice. The controller 60 detects this, and when the time is smaller than the set time, it determines that it is time to replace the core, and outputs a core replacement operation command to the motor M. That is, when the lead chuck 30 descends without holding the lead A, it descends quickly, so the time until the switch 50 is turned on changes depending on the length K of the lead A.

The core exchange operation command is as follows.

As shown in FIG. 4(a), when the controller 60 determines that it is time to replace the core when the switch 5o is turned on, the base 1
is moved to a predetermined residue discharge position, and after a certain period of time has elapsed, the controller 6o sends a signal (that is, a strong current) to reverse rotation with a strong torque to the motor M, and the motor M reverses the rotation with a torque stronger than that during normal operation. and lift the core chuck 30 in the same manner as described above.

As a result, as shown in FIG. 4(b), when the slope 7'a of the sleeve 7 comes into contact with the lower surface 40a VC of the both side pieces 40 of the stopper 4 at the aforementioned intermediate position, the torque of the motor M is large, so the slope At step 7'a, the both pieces 40 are expanded and further raised from the intermediate position, and the cap 9 comes into contact with the horizontal piece 41 of the stopper 4 as shown in FIG. 8 does not rise, but the vibro rises together with the sleeve 7, and the chuck ring 29 rises against the coil spring 24, as shown in FIG. As the core expands, the holding power of the core becomes weaker.

This state is maintained for a certain period of time, during which time the new lead A' passes through the lead insertion hole 33 and the lead chuck 30, and the lead guide 20
The new core A' comes into contact with the upper part of the residue A as shown in FIG. 4(e).

As a result, the new core A' pushes out the residue A and discharges it to a predetermined residue discharge position.

Effects of the Invention The motor M is controlled by the normal operation command from the controller 60.
By controlling the drive with a weak torque and repeatedly moving the lead chuck 30 together with the vibro up and down between the intermediate position and the lowest point of the guide 4, the lead A can be re-held in the lead chuck 30 and sequentially fed out.

The motor M is driven and controlled with strong torque by the core exchange operation command from the controller 60, the core stock 8 is stopped, the pipe 6 is moved above the intermediate position, and the core chuck 30 and the chuck ring 29 are moved relative to each other. As a result, the new lead in the lead stock g can fall through the lead chuck 30 to the lead guide 20, and the residue can be discharged and replaced with a new lead.

Therefore, the operation of discharging the residue and replacing it with a new core can be performed automatically, eliminating the need for troublesome manual operations.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a sectional view of a writing instrument, FIG. 2 is a schematic diagram of a writing device, FIGS. ) to (e) are explanatory diagrams of residue discharge operation. 1 is the base, 4 is the stopper, 5 is the case, 6 is the pipe, 8
is the core stock, 29 is the chuck ring, 30 is the core chuck, 60 is the controller, and M is the motor.

Claims (1)

[Claims] A cylindrical case 5 is fixed to the base 1, a core guide 20 is provided at the tip of the case 5, a pipe 6 is fitted into the case 5 so as to be movable up and down, and the core is inserted into the pipe 6. The base 1 is fitted with the stock 8, and the core chuck 30 and the chuck ring 29, which constitute the core chuck mechanism, are provided on the core stock 8 and the pipe 6 so as to face each other and to generate a core holding force with a spring. is a motor M that moves the pipe 6 up and down.
A lifting mechanism 3 is provided, and a stopper 4 is provided that regulates the maximum rise position of the core stock 8 with a strong force and the rise of the pipe 6 with a weak force at an intermediate position, and prevents the core chuck 30 from reaching its lowest position. In addition to providing a means for detecting the point,
The writing device is characterized in that it is provided with a controller 60 which outputs a normal operation command with a weak torque and a lead replacement operation command with a strong torque to the motor M based on this detection signal, and detects a residual state.