JPH0125719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording head, and includes:
Specifically, it relates to a recording head that uses a consumable recording core made of pencil, crayon, pigment, etc. to draw and record on the surface of a recording medium such as drawing paper, and the recording head moves up and down at high speed. The present invention also provides a recording head that guarantees a constant core pressure and has a small impact force on the recording core.

FIG. 1 is an explanatory diagram showing an example of the structure of the main parts of a conventional head of this type, in which 1 is a recording body, 2 is a recording core, 3 is a core holder, and 4 is a tailstock. As the recording medium 1, for example, drawing paper is used.
The recording core 2 is used to record drawings on the surface of the recording medium 1, and is, for example, a pencil. The core holder 3 is arranged so as to face the surface of the recording medium 1, and the recording core 2 is inserted therein so as to be movable along the axial direction and is held by a bush 31. The tailstock 4 presses the recording core 2, and is inserted into the core holder 3 so as to be movable along the axial direction so as to press one end of the recording core 2.

In such a configuration, during recording, the core holder 3 is lowered to a predetermined position near the surface of the recording medium 1, and the tail rod 4 is lowered to place the recording core 2 on the surface of the recording medium 1 at a constant position. Press with force.
Here, the tailstock 4 is lowered as the recording core 2 wears out, and the pressing force is controlled to be always constant. On the other hand, when not recording, the tailstock 4 is raised to a predetermined position, and the lead holder 3 is also raised to a predetermined position. At this time, recording core 2
Since the recording core 2 is held by the bush 31, the recording core 2 also rises together with the bush 3. Note that the tailstock 4 is raised to a position where the end thereof does not come into contact with the recording core 2.

By the way, in such a device, the tailstock 4
When it is lowered at high speed, the tailstock 4 comes into contact with the recording core 2 at high speed, and the recording core 2 also comes into contact with the recording medium 1 at high speed. As a result, a large impact force acts on the recording core 2, causing the recording core 2 to break or
There is a risk that both ends of the recording core 2 may be chipped, leading to core clogging or deterioration of image quality. In order to solve this problem, it is conceivable to lower the tailstock 4 at a low speed, but this would require an increased amount of time and would impair high-speed recording performance.

The present invention solves these drawbacks, and includes a core holder in which a recording core for performing drawing recording on the surface of a recording medium is inserted so as to be movable along the axial direction and is held with a holding force N; One end of the lead is inserted movably along the axial direction into the lead holder so as to press one end of the lead, a first stopper is attached to the other end, and a second stopper is attached to the middle part. a push rod, an arm movably engaged between the stoppers of the tailstock rod and driven along the axial _direction of the tailstock rod by reeling; The first spring has a spring coefficient k ₁ set so that the relationship holds, and is attached to the tailstock so as to be located between the arm and the second stopper, and the relationship k ₁ < k ₂ holds. has a spring coefficient k ₂ set to hold, is formed shorter than the first spring,
A second spring is attached to the tailstock so as to be located between the arm and the second stopper.

Examples will be described below with reference to the drawings.

FIG. 2 is an explanatory diagram of the configuration of essential parts showing one embodiment of the present invention, and parts equivalent to those in FIG. 1 are given the same reference numerals. In Figure 2, 5 is an arm;
6 and 7 are springs, 8 and 9 are pulleys, 10 is reeling line, 1
1 is a motor. A stopper 41 is fixed to one end of the tailstock 4, and a stopper 42 is also fixed to an intermediate portion. One end of the arm 5 is movably engaged between the stoppers 41 and 42, and the other end is fixed to the reeling yarn 10. The springs 6 and 7 are attached to the tailstock 4 between the stopper 42 and the arm 5. Here, the spring coefficient of spring 6 is k ₁ and spring 7 is
Assuming that the spring coefficient of is k ₂ and the holding force of the recording core 2 by the bush 31 is N, these magnitudes become k ₁ <k ₂ , and furthermore, N=k ₁・l (l is the amount of compressive displacement of the spring 6 ). Further, the spring 6 is formed longer than the spring 7.

The operation of the device configured in this way will be explained.

During recording, the lead holder 3 is lowered to a predetermined position near the surface of the recording medium 1, and the tail rod 4 is lowered by moving the arm 5. FIG. 3 is a characteristic diagram showing an example of the relationship between the descending distance L of the arm 5 and the pressing force P applied to the recording core 2 by the tailstock 4 in FIG.
The horizontal axis shows the descent distance L, and the vertical axis shows the pressing force P. No pressing force P is applied to the recording core 2 until the tailstock 4 comes into contact with the recording core 2. Tailstock 4
When the arm 5 descends to a distance L ₁ at which it contacts the recording core 2, a pressing force proportional to the spring constant k ₁ of the spring 6 is first applied to the recording core 2. Then, the arm 5 is lowered by a predetermined amount l, and the spring 6 is compressed by a predetermined amount l, so that N≦
When k ₁ ·l is reached, the recording core 2 begins to descend toward the recording medium 1 and comes into contact with the recording medium 1. Further, when the arm 5 is lowered, the spring constant k ₂ of the spring 7 is also added at the distance L ₂ , and the pressing force P increases in proportion to the sum of the spring constants k ₁ and k ₂ . motor 11
When the pressing force P reaches a predetermined magnitude Ps, the rotation is controlled so as to maintain that magnitude. On the other hand, when recording is not to be performed, the tailstock rod 4 and the lead holder 3 are raised to a predetermined position as in the conventional case.

With this configuration, the impact force at the time of contact between the tailstock 4 and the recording core 2 and between the recording core 2 and the recording medium 1 is smaller than when the arm 5 is lowered at the same speed as in the conventional configuration. , damage and breakage of the recording core 2 can be significantly reduced.

With this configuration, the impact force when the tailstock 4 and the recording core 2 and the recording core 2 and the recording body 1 come into contact can be made extremely small. Incidentally, since the time during which the tailstock rod 4 moves at low speed is relatively short, high-speed recording performance is not significantly impaired.

As explained above, according to the present invention, a recording head with small impact force on the recording core can be realized.
It is suitable for a recording head of a plotter driven by an output signal of an electronic computer.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram showing an example of the configuration of a conventional device, FIG. 2 is a configuration explanatory diagram showing an embodiment of the present invention, and FIG. 3 is a characteristic example diagram for explaining the operation of FIG. 2. be. 1... Recording body, 2... Recording core, 3... Core holder, 4... Tailstock, 5... Arm, 6, 7... Spring, 8, 9... Pulley, 10... Reeling yarn, 11... …
motor.

Claims (1)

[Scope of Claims] 1. A core holder into which a recording core for drawing and recording on the surface of a recording medium is movably inserted along the axial direction and held with a holding force N; A tailstock rod whose one end is inserted movably in the axial direction into a lead holder, a first stopper is attached to the other end, and a second stopper is attached to an intermediate portion, and between the stoppers of the tailstock rod. The arm is movably engaged with the thread reel and is driven along the axial direction of the tailstock rod by reeling, and the relationship of N= _k1・l (l is the amount of compressive displacement of the first spring) is established. a first spring that has a spring coefficient k ₁ and is attached to the tailstock so as to be located between the arm and the second stopper; and a spring coefficient that is set so that the relationship k ₁ < k ₂ holds. k ₂ and formed shorter than the first spring;
A recording head comprising: a second spring attached to the tailstock so as to be located between the arm and the second stopper.