JPS581561A - Recording head - Google Patents

Abstract

PURPOSE:To reduce impact force to a recording stylus while assuring constant a pressure, by a method wherein a pushing rod is fallen at a high speed at first and, after contacted with the recroding stylus, fallen at a low speed or the pushing pressure of the pushing rod is increased corresponding to the falling distance thereof. CONSTITUTION:The spring coefficient K1 of a spring 6, the spring coefficient K2 of a spring 7 and a holding force N of the recording stylus of a bush 31 are set so as to satisfy formula K1<K2, N=K1.l (wherein l is compression displacement amount of the spring 6). When an arm 5 is fallen over a distance L1 where a pushing rod 4 is contacted with the recording stylus 2, pushing pressure proportioned to K1 is added to the recording stylus 2. When the spring 6 is compressed to a predetermined amount 1 and N becomes equal to or less than K1.l, the recording stylus 2 initiates falling to be contacted with the recording material 1. In addition, when the arm 5 is fallen, the spring coefficient of the spring is added in a distance L2 and pushing pressure P is increased in proportion to the sum of K1 and K2. When the pushing pressure P reaches a predetermined pressure value Ps, a motor 11 is rotated and controlled so as to maintain the pressure Ps.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording head, and more specifically, the present invention relates to a recording head for drawing on the surface of a recording medium such as drawing paper using a consumable recording core made of a pencil, crayon, pigment, etc. The present invention relates to a recording head that performs recording, and provides a recording head that guarantees vertical movement of the recording core at high speed and constant core pressure, while having a small impact force on the recording core.

FIG. 1 is a configuration explanatory diagram showing an example of the configuration 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 bar. 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 disposed so as to face the surface of the recording medium 10, and the recording core 2 is inserted therein so as to be movable along the axial direction and is held by a pusher 31. In such a configuration, the tailstock rod 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. When recording, use lead holder 3.
is lowered at a predetermined position near the surface of the recording medium 1, and the tailstock 4 is lowered to press the recording core 2 against the surface of the recording medium 1 with a constant force.

Here, the tailstock 4 is lowered according to the wear of the recording core 2,
The pressing force is always controlled to be constant.

On the other hand, when recording is not to be performed, the tailstock 4 is raised to a predetermined position, and the single-core holder 3 is also raised to a predetermined position. At this time, since the recording core 2 is held by the bushing 31iC, the recording core 2 also rises together with the bushing 3. Note that the end of the tailstock 4 is connected to the recording core 2.
Raise it to a position where it does not come into contact with the

By the way, in such an apparatus, when the tailstock 4 is lowered at high speed, the corestock 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, which may cause the recording core 2 to break, or both ends of the recording core 2 to be chipped, resulting in core jamming 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 more time and would impair high-speed recording performance.

The present invention solves these drawbacks, and uses a drive mechanism for moving the tailstock rod, which lowers the tailstock rod at a relatively high speed until it almost contacts the recording core, and then lowers it at a relatively low speed. The present invention is characterized in that at least one of the mechanism and a drive mechanism that increases the pressing force of the tailstock after contacting the recording core in accordance with the descending distance of the tailstock is used.

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 denoted by the same reference numerals.

In FIG. 2, 5 is an arm, 6°7 is a spring, 8 and 9 are pulleys, 1o is a reeling line, and 11 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.

The arm 5 has one end connected to these stoppers 41, 421Sl'
1, 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, if the spring coefficient t- of the spring 6 is 1, the spring coefficient '4r of the spring 7 is 2, and the holding force of the recording core 2 by the bushing 31 is N, then (3) these magnitudes are 1< k2, and furthermore, N=1・
t (t is the compression 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 6 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 of the arm 5 in FIG. 2 and the pressing force P applied to the recording core 2 by the tailstock 4, with the horizontal axis representing the descending distance. 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. When the arm 5 descends to a distance L1 where the tailstock 4 contacts the recording core 2, a pressing force proportional to the spring constant of the spring 6 is applied to the recording core 2. Then, when the arm 5 descends by a predetermined distance and the spring 6 is compressed by a predetermined amount to reach N<k-t, the recording core 2 begins to descend toward the recording medium 1 (4) and comes into contact with the recording medium 1. do. Further, when the arm 5 is lowered, 2 is added to the spring constant of the spring 7 at the distance L2, and the pressing force P increases in proportion to the sum of the spring constant and 2. When the pressing force P reaches a predetermined magnitude PsK, the motor 11 is rotationally controlled to maintain that magnitude. On the other hand, when recording is not to be performed, the tailstock rod 4 and the core holder 3 are raised to a predetermined position as in the conventional case.

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

In addition, in FIG. 2, an example is explained in which the arm 5 is made of a rigid body and the pressing force P is increased according to the descending distance of the arm 5 using two springs 6°7 having different spring constants and linear characteristics. However, even if one spring having predetermined nonlinear characteristics is used instead of the springs 6 and 7, the desired change characteristics of the pressing force P can be obtained. However, the arm 5 may also be composed of a leaf spring with non-linear properties. In this case, the arm 5 and the tailstock rod 4 are engaged so that they are fixed along the moving direction of the tailstock rod 4 and slidable along the longitudinal direction of the arm 5 . With this configuration, the springs 6 and 7 in FIG. 5 can be omitted.

FIG. 4 is an explanatory diagram of the configuration of essential parts showing another embodiment of the present invention, in which parts equivalent to those in FIG. 2 are given the same reference numerals. In FIG. 4, a microprocessor 12 has a function of controlling the rotational speed of the motor 1 according to the distance between the recording core 2 and the tailstock 4. FIG. 5 is a characteristic diagram showing an example of the relationship between the descending distance of the tailstock 4 and the descending speed V of the tailstock 4 during recording with the apparatus shown in FIG.
The horizontal axis shows the descent distance, and the vertical axis shows the descent speed V. The tailstock 4 has a distance PII just before it contacts the recording core 2.
It descends at a relatively high speed V until L1, but after that it descends at a relatively low speed V. Then, the tailstock 4 comes into contact with the recording core 2 by descending to a distance L2, and the recording core 2 comes into contact with the recording medium 1 by descending to a distance L3.

In this manner, the rotation of the motor 11 is controlled so that a predetermined pressing force is applied to the recording core 2 while the recording core 2 is in contact with the recording medium 1 . Such descent distance and descent speed V
Related control can be performed by temporarily storing information such as the length of the recording core 2, the initial position of the core holder 3, and the initial position of the arm 5 in the memory of the microprocessor 12.

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 described above, according to the present invention, a recording head with small impact force on the recording core can be realized, and 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. Example diagram, FIG. 4 is a configuration explanatory diagram showing another embodiment of the present invention, and FIG.
FIG. 3 is a characteristic example diagram for explaining the operation of the diagram. 1... Recording body, 2... Recording core, 3... Core boulder,
4...Tailstock, 5...Arm, 6.7...Spring,
8, 9... Pulley, 10... Yarn reeling, 11... Motor, 12... Microprocessor. (8) Figure 1 Figure 2 Part 3

Claims (1)

[Claims] A recording medium, a recording core that performs drawing and recording on the surface of the recording medium, a core holder into which the recording core is movably inserted and held in the axial direction, and a core holder that presses one end of the recording core. A tailstock rod is inserted so as to be movable along the axial direction, a drive mechanism that lowers the tailstock rod at a relatively high speed until it comes into contact with the recording core and then lowers it at a relatively low speed, and a drive mechanism that lowers the tailstock rod at a relatively low speed until it comes into contact with the recording core. A recording head comprising at least one of the drive mechanisms that increases the pressing force of the tailstock bar in accordance with the descending distance of the tailstock bar.