JPH0224238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording head that performs drawing and recording on the surface of a recording medium using a consumable writing core. It relates to a recording head that applies a constant pressing force to a writing lead.

FIG. 1 is a diagram showing an example of a conventional configuration of such a recording head.

In FIG. 1, 1 is a consumable writing lead, 2 is a lead holder, 3 is a tailstock, and 20 is a recording medium. As the consumable writing lead 1, for example, a pencil lead is used. The pencil lead 1 is inserted into the lead holder 2 so as to be movable in the direction AA', and is held in the tip 2' by proper fitting. The tailstock 3 is inserted into the lead holder 2 so as to press one end of the consumable writing lead 1. The lead holder 2 and the tailstock 3 are moved by a moving mechanism (not shown) according to the recording state.
It is moved in the A′ direction. The recording medium 20 is, for example, drawing paper.

In the recording head having such a configuration, during recording, the moving mechanism moves the core holder 2 in the A' direction and lowers it to a predetermined position near the surface of the recording medium 20, and the tail rod 3 is moved in the A' direction. direction and touch the end of pencil lead 1,
is pressed against the surface of the recording medium 20 with a constant force. On the other hand, when not recording, the moving mechanism moves the tailstock 3 in the A direction and raises it to a predetermined position, and also raises the lead holder 2 to a predetermined position. At this time, since the pencil lead 1 is held at the tip 2', the pencil lead 1 also rises together with the lead holder 2. Note that the tailstock 3 is raised to a position where the end thereof does not come into contact with the pencil lead 1.

However, with such a recording head, 1 pencil lead
decreases as recording progresses, so the tailstock 3 is displaced greatly. Therefore, there was a problem that the recording head became taller.

The present invention was made to solve these problems, and an object of the present invention is to realize a recording head whose height can be reduced even when a consumable writing lead is used.

The present invention provides a consumable writing lead, a lead holder into which the consumable writing lead is inserted and held so as to be movable in the axial direction, and a groove is formed in the axial direction, and the consumable writing lead. A moving body whose one end is fixed and is movably inserted into the core holder in the axial direction, an arm movably inserted into the groove and engaged with the moving body, and a spring that applies rotational torque in a fixed direction. a ratchet wheel, a winding transmission means for converting the rotational torque of the ratchet wheel into a force in the direction of lowering the consumable writing lead and transmitting the force to the arm; When recording, the pawl is raised to a position where it does not come into contact with the teeth of the ratchet wheel, and the rotating torque of the mainspring lowers the consumable writing lead into contact with the recording medium, and when not recording. This is a recording head characterized by comprising a plunger which presses the pawl against the teeth of a ratchet wheel and rotates it against the rotational torque of a mainspring to lift the consumable writing lead.

Hereinafter, the present invention will be explained using the drawings.

FIG. 2 is a diagram showing the structure of one embodiment of the recording head according to the present invention. Components that are the same as those in FIG. 1 are given the same reference numerals and redundant explanation will be omitted.

In FIG. 2, reference numeral 4 denotes a chip made of a magnetic material, which is attached to the end of the pencil lead 1. Reference numeral 5 denotes a moving body, a pin 6 is planted near the center, and a magnet 7 is attached to one end. The movable body 5 is inserted into the core holder 2 so as to be movable in the axial direction. The magnet 7 magnetically fixes the chip 4. Reference numeral 8 denotes a winding transmission means, such as an endless ribbon, which is hung on pulleys 9 and 10, and has an arm 11 attached to one side thereof. A ratchet wheel 12 having teeth in a fixed direction is coaxially fixed to the pulley 9.
A rotational torque in a counterclockwise direction B is applied to the pulley 9 and the ratchet wheel 12 by rotational torque generating means such as a spring (not shown). The rotational torque of the ratchet wheel 12 is converted into a force in a fixed direction by the endless ribbon 8. The arm 11 is inserted into a groove 2'' formed in the axial direction of the lead holder 2 so as to be movable in the A-A' direction, and the pin 6 is inserted into the recess 11'.1
3 is a pawl disposed close to the ratchet wheel 12. 14 is a claw moving mechanism that moves the claw 13. In the pawl moving mechanism 14, 15 is a solenoid, and 16 is a magnetic material.
It is a plunger that moves in the C-C' direction by the magnetic force of. A protrusion 1 is located near the lower end of the plunger 16.
6', and a claw 13 is attached to the lower end. A spring 17 is placed between the solenoid 15 and the convex portion 16', and applies a force to the plunger 16 in the C' direction.

In the recording head having such a structure, the pencil lead is lowered in the following manner during recording.

Solenoid 15 is activated by an external circuit (not shown).
When the plunger 16 is excited, the magnetic force causes the plunger 16 to move in the direction C against the spring force of the coil spring 17, and the pawl 13 rises to a position where it does not come into contact with the ratchet wheel 12. As a result, the ratchet wheel 12 and pulley 9 are moved to B by the mainspring.
Rotate in the direction. This movement is endless ribbon 8
The arm 11, the pin 6, the moving body 5,
The magnet 7, tip 4 and pencil lead 1 move in the A' direction. Then, the pencil lead 1 stops at a position where its tip abuts against the recording medium 20. At this time, a pressing force is applied to the pencil lead 1 due to the rotating torque of the mainspring. As the pencil lead 1 becomes shorter as it records, the ratchet wheel 1 changes accordingly.
2 is rotated in direction B by the rotating torque of the mainspring, and moves pencil lead 1 in direction A'. Since the range in which the rotating torque of the mainspring remains constant is set sufficiently large, the applied pressing force does not change even if the pencil lead 1 becomes shorter.

On the other hand, when not recording, the pencil lead is raised as follows.

The solenoid 15 is de-energized, the plunger 16 moves in the C' direction by the spring force of the coil spring 17, and the pawl 13 moves the ratchet wheel 12 and pulley 9 against the rotational torque of the mainspring.
Rotate in direction B′. This movement is transmitted by the endless ribbon 8, and the arm 11, pin 6, movable body 5, magnet 7, tip 4 and pencil lead 1 are lifted in the A direction. Since the force applied by the pawl 13 to the ratchet wheel 12 due to the rotating torque of the mainspring and the spring force of the coil spring 17 is constant, the ratchet wheel 12 is rotated by a constant amount,
Thereby, the pencil lead 1 is lifted by a certain distance regardless of its length.

In addition, in the embodiment, a case where a magnetic chip attached to a pencil lead is magnetically fixed by a magnet attached to a moving body is illustrated, but the invention is not limited to this. It may be fixed by With this configuration, there is no need to process the pencil lead.

Further, in the embodiment, a case where a pencil lead is used as the consumable writing lead is illustrated, but other materials such as crayons, pigments, etc. may be used as the consumable writing lead.

Further, in the embodiment, an endless ribbon is used as the winding transmission means, but other means such as wire, wire, etc.
A belt or the like may be used.

According to the present invention, in the vertical movement of the consumable writing lead, a winding means is used to transmit the moving power, and a ratchet wheel rotated by a reciprocating plunger is used to generate the moving power. This makes it possible to reduce the height of the recording head even when using a consumable writing lead.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a conventional configuration of a recording head using a consumable writing lead, and FIG. 2 is a diagram showing the configuration of an embodiment of a recording head according to the present invention. DESCRIPTION OF SYMBOLS 1...Consumable writing lead, 2...Lead holder, 5...Moving body, 8...Wrap transmission means, 11...Arm, 12...Ratchet wheel, 13...Claw, 14...Claw moving mechanism, 1
6...Plunger, 20...Record body.

Claims (1)

[Claims] 1 A consumable writing lead, a lead holder into which the consumable writing lead is inserted and held so as to be movable in the axial direction and having a groove formed in the axial direction, and one end of the consumable writing lead being fixed. a movable body inserted movably in the axial direction into the lead holder; an arm movably inserted into the groove and engaged with the movable body; and a latch to which rotational torque in a fixed direction is applied by a spring. an etching wheel, a winding transmission means for converting the rotational torque of the ratchet wheel into a force in the direction of lowering the consumable writing lead and transmitting the force to the arm, and a pawl disposed close to the ratchet wheel. When recording, the pawl is raised to a position where it does not contact the teeth of the ratchet wheel, and the rotating torque of the mainspring lowers the consumable writing lead into contact with the recording medium; when not recording, the pawl is raised to a position where it does not contact the teeth of the ratchet wheel. A recording head comprising a plunger which lifts the consumable writing lead by pressing the lead against the teeth of a ratchet wheel and rotating it against the rotational torque of a mainspring.