JPH025999Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a pencil lead device for a drawing instrument.

In the conventional device, a large number of cores housed in a turret tube were pushed by a push rod, but because the stroke of the push rod was long, the push rod was operated by a carriage attached to a string wrapped around a pulley. However, this increased the size of the device and made the operation of the push rod by the string wrapped around the pulley unreliable.

The present invention eliminates this drawback, and the core inside the turret cylinder is pushed out by a wire wound around a rotary disk.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Figures 1A and 1B schematically show a drafting device according to the present invention.
is provided to reciprocate in the axial direction by means of a rail 4 on a reciprocating and rotating roll 3 on which paper 2 is wound. Alternatively, as shown in B, the device 1 according to the present invention is arranged so that the rail 6 is moved in the X direction by the rail 5 on the paper 2.
It is provided so that it can be operated at any position in the Y direction. Alternatively, although not shown, the device 1 is provided to be operated in any position by means of two connected rotary arms.

As shown in the second diagram, the device 1 according to the present invention has a line 10
It consists of a pair of mechanisms 1a and 1b that are symmetrical with respect to , one for a 0.5 mm core and the other for a 0.3 mm core, and since the other mechanisms are exactly the same, only one is illustrated.

As shown in the second and third figures, a shaft 12 is installed vertically on the bottom of the outer casing 11, and a turret cylinder 13 is fitted onto this shaft 12 so as to rotate and move up and down.

As shown in the fourth and fifth figures, this turret cylinder 13 consists of a pair of inner cylinder 14 and outer cylinder 15.
The outer peripheral surface of the tube has vertical grooves 17 at equal angular intervals for inserting 20 cores 16, and the cores 16 are held between these and the outer cylinder 15 so as to be able to move up and down. As shown in FIG.
A part of the annular groove 18, directly above the paper 2, has a through hole 19 for allowing the core 16 to protrude. As shown in FIG. 4, a portion of the lower part of the outer cylinder 15 is cut out to expose the core 16, and a conical rubber band 21 is wrapped around the upper side of the notch 20, and the core 16 is moved freely by the frictional force. A sensor 22 for detecting the core 16 is mounted on the side of the notch 20, for example, a pair of light emitting diodes 2.
3 and a light receiving element 24 are provided.

Gear 3 fixed to the top of the turret tube 13
0 is connected to a gear 32 of a turret drive motor 31. This motor 31 is controlled by a signal from the sensor 22.

As shown in the second and third figures, the fork 33 is engaged with the turret tube 13 to transmit only vertical motion.
is connected to the plunger 35 of the solenoid 34 to be lowered. This fork 33 and plunger 35
is rebound upward by the spring 36. Note that the stroke of the vertical movement of the plunger 35 is made longer than the length of the through hole 19. 37 is a sensor for detecting the vertical position.

Above the turret cylinder 13 is a tailstock device 39.
will be established. That is, in this tailstocking device 39, a rotary disk 41 is rotatably supported by a shaft 40, a wire 42 for tailstocking is wound around the rotary disk 41, one end of which is fixed with a stopper 43, and the wire 42 is The other end is inserted into the hole 44 of the fork 33 and is opposed to the upper end of the core 16 located directly above the through hole 19.

The rotary disk 41 is connected to a tailstock motor 47 via a worm gear 45 and a worm 46, a scale plate 50 of an encoder 49 is fixed to the shaft 40, and the motor 47 is controlled by the output signal of the encoder 49. do.

Next, the operation of this device will be explained.

First, the gears 32, 30 are rotated by the rotation of the motor 31.
The turret tube 13 is rotated about the shaft 12 via the turret tube 13. Thus, the core 1 is placed directly above the through hole 19.
6, the light receiving element 24 of the sensor 22 generates a signal, and this signal causes the motor 31 to stop.

Next, current flows through the solenoid 34, and the plunger 35, fork 33, and turret tube 13 descend against the elasticity of the spring 36, and the lower end of the inner tube 14 fits into the annular groove 18 as shown in the fourth figure. .

Next, the motor 47 rotates, and the rotary disk 41 rotates counterclockwise in FIGS. 2 and 3 via the worm 46 and worm gear 45, and the wire 42 descends to push the upper end of the core 16 downward. . Thereby, the lower end of the core 16 is inserted into the through hole 19 and protrudes from the bottom surface of the outer casing 11 to write a predetermined figure or character on the paper 2. Thus, each time the core 16 is worn out, the motor 47 rotates little by little, and the wire 42
1 and pushes the lead 16 downward, leading to the lead 1
6 is one that is rolled out little by little.

In this way, when the effective length of the core 16 has been completely paid out and the rotary disk 41 and the wire 42 cannot move, the motor 47 and the rotary disk 41 are rotated in the opposite direction by a signal from the encoder 49, and the wire 42 that has been fed out is completely rotated. Wind it up. Next, the current in the solenoid 34 is cut off, and the elasticity of the spring 36 causes the plunger 3 to
5. The fork 33 and turret tube 13 rise slightly. As a result, the core 16 escapes above the through hole 19. Next, the motor 31 rotates the turret cylinder 1.
3 rotates, and when the new core 16 comes to the position directly above the through hole 19, the motor 31 and the turret tube 13
stops.

Next, current flows through the solenoid 34 and the new wick 16 is put into use in the same manner.

In the above embodiment, the core 16 is detected by a reflective sensor 22, but when the turret cylinder 13a is formed of an inner cylinder 14a and an outer cylinder 15a made of transparent plastic, or as shown in FIGS. 14a
If there is a through hole in the core 16, use the through-hole sensor 22a.
may be detected. That is, the shaft 12a is made hollow, and the light emitting diode 23a of the sensor 22a is provided inside the hole, and the light receiving element 24a thereof is provided outside.

As described above, in the tailstocking device of the present invention, the tailstocking wire is wound around the rotary disk, and the tailstocking wire is opposed to the upper end of the core in the turret tube, and the core in the turret tube is rotated. Since the extrusion is performed using a wire wound around the disk, the operation is reliable, and since the wire is wound around the rotary disk and stored, the device can be made smaller.

[Brief explanation of drawings]

1A and 1B are perspective views showing outlines of two examples of a drafting instrument to which the present invention is applied, FIG. 2 is a perspective view of the main parts of an embodiment of the present invention, and FIG. 4 is a sectional view of a part of the turret tube, FIG. 5 is a sectional plan view thereof, FIG. 6 is a sectional view of a turret tube according to another embodiment of the present invention, and FIG. 7 is a sectional plan view thereof. 11...Outer casing, 12...Shaft, 13...Turret tube, 39...Tail pushing device, 41...Rotary plate, 42
... wire, 16 ... core.

Claims (1)

[Scope of utility model registration request] A turret tube is fitted onto a shaft provided at the bottom of the outer casing to rotate and move up and down, and a tailstock device is provided above the turret tube. A pencil lead device for a drafting instrument, comprising a wire wound around the wire, and one end of the wire for pushing the lead facing the upper end of the lead in the turret cylinder.