JPS6189897A - Pen type recording 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 (Industrial Application Field) The present invention relates to a pen-type recording device, for example, a pen-type recording device that is installed in various office automation equipment and is capable of drawing characters, figures, graphs, etc. in multiple colors. Regarding.

(Prior Art) A conventional pen-type recording device as described above is disclosed in, for example, Japanese Patent Laid-Open No. 191200/1983.

This device will be explained below with reference to the second diagram and FIG. 2(B).

The second figure (A1) is a side view of the pen head mechanism of a conventional pen-type recording device, and the second figure is a rear view (view from the rear of the pen). Reference numeral 1 in the figure is a rotatable platen. 2
This is a pen head mechanism that is disposed facing the recording paper 3 pressed against it and performs a pen exchange operation and a writing operation on the recording paper 3.

This pen head mechanism 1 includes a carriage 4 that is movable in a direction parallel to the axis of the platen 2.

The carriage 4 has an L-shape as shown in FIG. A rotatable center shaft 6 is provided. A pair of pen holders 7a and 7b are respectively fixed near both ends of the center shaft 60, and pens 8a and 8b are arranged around the pen holders 7a and 7b.

Grooves for holding 8c and 8d are formed coaxially with each other. Further, a ratchet 9 is fixed to one end of the center shaft 6, and a detent spring lO is attached to one side of the ratchet 9 to prevent the ratchet 9 from rotating in the counterclockwise direction (FIG. 2(B)). The other side of the ratchet 9 is engaged with a pawl 11 for rotating the ratchet 9 clockwise (in the direction of the clock mark A).

The lower end of the claw body 11 is connected to a shaft 12 by a drive mechanism (not shown).
It is in contact with a lever (cam) 13 which is rotated at the same time. Further, the claw body 11 is biased downward in the drawing by a spring 14. Note that 15 is a hammer for pressing the selected pen against the recording paper 3 wrapped around the platen 2 for writing, and 16 is a hammer for pressing the selected pen against the recording paper 3 wrapped around the platen 2, and 16 is a hammer for pressing the selected pen against the recording paper 3 wrapped around the platen 2. It is a leaf spring installed in the. The leaf spring 16 is made of a thin spring material, and has four arm-shaped pieces each having a support hole into which the tips of the pens 83 to 8d are inserted and support them, and serves as a pen return spring. act.

Writing with a pen-type recording device having the above configuration (
To explain the operation (drawing), there are 04 pens by color, 8
The pen holders 7a and 7b with pen holders a to 8d attached rotate in the direction of the arrow (FIG. 2(B)) around the center shaft 6,
When the selected pen reaches the predetermined writing position (the position of the hammer 15), the pen (FIGS. 2(5) and 2(B)
) In the figure, the pen 8a) is pushed by the hammer 15, the pen tip is pressed against the recording paper 3 on the platen 2, and drawing is performed in the state shown in the figure, that is, in the pen down state. When drawing is completed, the pen 8a is moved away from the recording paper 3 due to the release of the hammer 15 and the restoring force of the leaf spring 16, resulting in a state in which no writing is performed, that is, a pen-up state.

Regarding the pen selection operation, when a desired pen is selected, first the shaft 12 is moved by a drive mechanism (not shown).
is rotated by a predetermined angle. As the shaft 12 rotates, the lever 13 moves upward and pushes the claw body 11 upward. At this time, when the power to the drive mechanism (not shown) is cut off, the lever 13 and the shaft 12 return to their original positions, and the claw body 11
is lowered by the piascus of the spring 14, and the ratchet 9 rotates in the direction of the arrow. As the ratchet 90 rotates, the pen holders 7a and 7b, which are integrated with the ratchet 9 via the center shaft 6, also rotate in the direction of arrow A. By repeating the above operations, the pen holder 7
a and 7b are rotated by a desired angle to select a pen.

(Problems to be Solved by the Invention) In the above-mentioned prior art device, selection of the pens 8a, 8b, etc. is performed by rotating the entire pen holder 7a, 7b on which a plurality of pens 8a, 8b, etc. are attached. Then, a desired pen, for example, the pen 8a, is rotated to the position of the hammer 15. However, in this type of device, the pen holders 7a, 7b as a whole occupy a large proportion of the weight of the pen head mechanism 1, and therefore have a large inertia. Moreover, the pen holders 7a and 7b that are integrated with the ratchet 9 can only rotate in one direction, that is, in the direction of arrow A in FIG. Impossible to select, pen 8b,
Pen 8d must be selected via Fjc.

Therefore, there is a drawback that the pen selection speed becomes slow and the drawing speed that accompanies pen selection becomes slow. In addition, the distance accuracy of each pen from the center shaft 6 and the horizontal positional accuracy of each pen positioned at the hammer 15 position differ from pen to pen, leading to a decrease in drawing quality and, in turn, a factor that reduces the drawing accuracy of the entire device. There was a drawback.

The present invention was made in order to eliminate the drawbacks of the prior art as described above, and an object of the present invention is to provide a pen-type recording device that has a fast pen selection speed and excellent drawing position accuracy.

(Means for Solving the Problems) The pen-type recording device of the present invention includes a platen that can rotate in both forward and reverse directions, and a pen head mechanism that can reciprocate in a direction parallel to the axis of the platen. The Ben head mechanism includes a pen holder to which a plurality of pens are attached, a pressing means, and a motor means. The pen holder is fixed so as not to rotate, and supports a plurality of pens radially so that their pen tips are concentrated at one point on the surface of the recording paper on the platen. Each pen is slidable only in its longitudinal direction. The motor means is rotatable in both forward and reverse directions, and is connected to the pressing means to rotate the pressing means, and the motor means has a position detection control section that detects the position of the pressing means and controls the rotation thereof. are doing. The pressing means selects a desired pen and presses the selected pen against the recording paper on the platen.

(Function) In this invention, since the pen-type recording device is configured as described above, each technical means functions as follows.

Since the pen holder is fixed without rotating, the mass of the rotating member of the pen head mechanism is small, and therefore the inertia is small to support a plurality of pens. Further, by mounting a plurality of pens on the pen holder so that they can slide radially and only in the longitudinal direction, there is no deviation in positional accuracy among the pens. The motor means rotates in the forward or reverse direction and rotates the pressing means under the control of the position detection control section to select a desired pen in the shortest possible time.

When a desired pen is selected, the pressing means presses the selected pen against the recording paper on the platen to make it ready for drawing. Therefore, it is possible to select pens at a fast pen selection speed and draw images without any deviation in the positional accuracy of each pen.
The problems of the prior art can be solved.

(Example) First, regarding the first example of this invention, Fig. 1 (5) ~
This will be explained with reference to FIG. 1(C).

FIG. 1(5) is a schematic side view of a pen head mechanism in a pen-type recording device according to a first embodiment of the present invention, and FIG. 1(B) is a rear view thereof. Also, Fig. i (c) (al and (
bl is a diagram for explaining the relationship between the pressing body and the pen in this embodiment. Reference numeral 21 in the drawing denotes a pen head mechanism which is placed in pressure contact with a platen 22 which can be rotated in both forward and reverse directions and is disposed opposite to the recording paper which rotates together with the platen 22, and which performs pen exchange operations and writing operations on the recording paper n. It is. The pen head mechanism 21 includes a carriage 24, which is guided by shirts 25a and 25b and can reciprocate in a direction parallel to the axis of the platen 22. One end of the carriage 24 (platen 22
A pen guide 5 is fixed to one end (side end), and a support plate 26 is fixed to the other end. A pulse motor 27 is supported on the support plate 26, and the shaft 2 of each pulse motor is
8 is rotatably supported by the pen guide 5 at one end. A pen holder 29 is provided on the shaft 28, and the pen holder 29 is prevented from rotating by a detent spring 30 attached to the carriage 24 and always remains fixed. Around the pen holder 29 is a pen 31a.

Grooves for supporting the pens 31b, 31c, and 31d are formed respectively, while the pen guide 5 has grooves for supporting the pens 31a to 31d.
A guide hole is formed to guide the tip of the d. Here, the groove of the pen holder 29 and the guide hole of the pen guide 5 are formed so that the pen tips of the pens 31a to 31d are concentrated at one point on the recording paper surface of the platen 22. That is, the pens 31a to 31d are arranged radially around one point on the surface of the recording paper.

The pens 31a to 31d are pressed against the pen stopper 33 by return springs 32a to 32d whose ends are in contact with the pen guide δ. The pens 31a to 31d are slidable only in their longitudinal direction. On the other hand, the pulse motor 27
pens 31a to 31d when writing on the shirt) 28.
A pressing member is provided for pressing the pens 31a to 31d in order to press the pen tips of the pens against the recording paper on the platen 22. The pressing body can be composed of, for example, a leaf spring as shown in FIG.
It is designed to rotate together with 28.

Further, the pen gutter mechanism 21 is provided with a position detector for detecting the position of the pressing body M. Between the position detectors, there is a timing disk fixed to the other end of the shirt 1-28 of the pulse motor 27 and having a hole formed therein to indicate the position of the pressing body, and a light-emitting light-receiving element for detecting the hole in the disk 36. It consists of 37. The position detector also serves as a home position detector.

Next, the operation will be explained. When the pen selection is determined based on the drawing information, the pulse motor 27 is driven and the shaft 28
rotates. With this 280 rotation, the pressing body rotates with the home position as a reference, and as shown in Fig. 1fQ (
As shown in al, the pressing body reaches the rear position of a desired pen, for example, the pen 31a. At this time, the pulse motor 27 can rotate in both forward and reverse directions, and the pen 3 can be rotated in the shortest distance.
Select 1a. When the pressing body M reaches the rear position of the pen 31a, the state shown by the dashed line in FIG. 1(C) (a) changes to the state shown by the solid line in FIG. The pen 31a is added to the pen holder 2.
9 and the hole in the pen guide 5. Then, the pen tip of the pen 31a comes into pressure contact with the n side of the paper on the platen n, and the pen is in a down state, that is, in a writable state, and drawing is performed.

Next, the pen-up operation will be explained. When the drawing operation by the selected pen, for example, the pen 31a, is completed, the pulse motor 27 is driven to rotate the shaft 28. The pressing body M rotates due to the rotation of the first (C) 28.
) As shown in Figure (al), the pressing body escapes from the rear position of the pen 31a.Then, the pen 3
1a is moved backward, and the rear part of the pen 31a is returned to the pen stopper, resulting in a pen-up state. In this state, the pressing body M is stopped between the pens 31a and 31b or between the pens 31a and 31d, as shown by the dashed line in FIG. 1B.

By the way, in the above embodiment, when selecting a pen, it is possible to immediately select from the pen 31a to the adjacent pen 31b or 31d. However, when selection information for the pen 31c is received and the pen 31c is selected from the pen 31a, the pressing condition is changed. pen 31
Selection is made by passing the pen 31d or the pen 31d. At this time, one point of the color of the pen 31b or 31d is plotted at the same point as the last plot point of the drawing line by the pen 31a, but only dots of each color are printed at the same position, In terms of quality, this is rarely a problem and can be ignored. If necessary, platen 220
Rotate the pressing body in the non-drawing area on both sides to a place between the pen 31b and the pen 31C or between the pen 31d and the pen 31c, and return it to the original position while keeping the pen up.
Color mixing may be avoided by selecting the pen 31c and moving the pen down after that.

Also, when replacing the pens 31a to 31d when their lifespan has expired, remove the detent spring by hand and remove the pen holder 29.
This is done with the pen holder 29 free. When the replacement is completed, the pen holder 29 is returned to its original position and fixed by the detent spring force.

As explained above, according to the first embodiment of the present invention, the pen holder 29 remains fixed and the desired pen is selected and the selected pen is moved up and down in one motion by only rotating the pressing body. It can be done with Therefore, the pressing body M is light in weight and has small inertia, and the pulse motor 2
7 can be rotated in both forward and reverse directions, which has the advantage of increasing pen selection speed and drawing speed. Further, in this embodiment, the plurality of pens 31a to 31d are arranged radially and attached to the pen holder 29 so that the pen tips of the plurality of pens 31a to 31d are concentrated at one point on the surface of the recording paper 23 on the platen 22. Since the pen holder 29 is fixed, drawing can only be done depending on the positional accuracy of the selected pens 31a to 31d, which has the advantage that high-quality drawing can be performed.

Next, a second embodiment of the present invention will be described with reference to FIG. In the figure, elements similar to those in Figures 1 to 1(C) are given reference numerals with 100 added to the reference numerals of the elements in Figures 1 to 1(C). Explanation will be omitted. Note that 139 is an oval camshaft, and 140 is an eccentric cam.

In this embodiment, the pulse motor 127 is attached to the left side of the support plate 126 in the figure, contrary to the case in FIG. 1(A). The pressing body 134 is connected to the oval shaft 128 of the pulse motor 127 so that rotation of the shaft 1280 is transmitted, and the pressing body 134 is connected to the oval shaft 128 of the pulse motor 127.
8 can be slid on. The eccentric cam 140 comes into contact with the pressing body 134, and is rotated via an oval-shaped camshaft 139 by a plunger magnet outside the side frame (not shown) in accordance with drawing information.

Pen selection according to this embodiment is performed in the same manner as in the first embodiment described above. That is, a pulse motor 127 that can rotate in both forward and reverse directions is driven according to drawing information, and a pressing body 134 connected to a shaft 128 of the pulse motor 127 is driven.
is rotated in the forward or reverse direction to reach the rear position of a desired pen, for example, the pen 131a, and pen selection is accomplished in the shortest possible time.

Regarding the pen down operation, for example, the pen 131a
is selected and the pressing body 134 comes to the rear position of the pen 131a, the eccentric cam 140 rotates due to the rotation of the camshaft 1390, and the pressing body 134 is pushed toward the platen 122. At this time, the pressing body 134 is
8 toward the platen 122, and the pen 131a
is pressed and the pen tip is brought into pressure contact with the surface of the recording paper 123, bringing the pen down. In the pen amplifier, when drawing with the pen 131a is completed, the eccentric cam 140 rotates as the oval camshaft 139 rotates, the pressing body 134 escapes from the rear position of the pen 131a, and the return spring 132a is restored. The force causes the pen 131a to move back to the pen stopper 133.

According to the second embodiment of the present invention, as in the case of the first embodiment, there is an advantage that the pen selection speed, that is, the drawing speed is increased, and high-quality drawings are performed. Further, in this embodiment, there is no problem of color mixing when selecting a pen as in the first embodiment.

That is, since the pen selection, pen amplifier, and down operations are performed in two steps, there is an advantage that beautiful drawings can be made.

(Effects of the Invention) As described in detail above, according to the present invention, the pen holder supporting a plurality of pens is fixed without rotating, and is equipped with a position detection control unit that detects and controls the position of the pressing means. A motor means capable of rotating in both forward and reverse directions is provided, and the pressing means is rotated by a predetermined angle to select a desired pen and to move the pen down and up.
The weight of the rotating member is light and the inertia is small, which, combined with the rotation of the motor means in both forward and reverse directions, increases the pen selection speed and increases the drawing speed. This invention has the advantage that the configuration is simple and inexpensive.Furthermore, in this invention, a plurality of pens are arranged radially and attached to the pen holder so that their pen tips are concentrated at one point on the recording paper surface on the platen. For,
This has the advantage that there is no deviation in drawing due to differences in the positional precision of the selected pens, high-quality drawing is performed, and the drawing accuracy of the entire apparatus is improved. Furthermore, the pen holder is fixed and pen selection is made by rotating only the pressing body, and there is no deviation in drawing between each pen, so this invention can be used in plotters that have a large number of pens and plotters that have pens with a large ink capacity. .

[Brief explanation of drawings]

The first figure is a schematic side view showing the pen head mechanism of the first embodiment of this invention, and the first figure (B) is the first figure as seen from the rear of the pen.
cAJ is a schematic back view of the pen head mechanism, Figure 1 (C) fa) and fb) is a schematic diagram showing the relationship between the pressing body and the pen in the first embodiment, and the second figure is a conventional pen-type recording 2(B) is a schematic side view showing the Ben head mechanism of the device; FIG. 2(B) is a schematic rear view of the Ben head mechanism of FIG. 2(5) seen from the rear of the pen; FIG. FIG. 3 is a schematic side view showing the gutter mechanism. 25, 125...Pen guides 27, 127...Pulse motors 29, 129...Pen holders 31a to 31d, 131a to 131d--
Pen San, 134... Pressing body A, I35... Position detector 36.136... Timing disk 37, 137.
... Between light emitting and receiving elements, 138 ... Home position 140 ... Eccentric cam

Claims (1)

[Claims] It is equipped with a platen that can rotate in both forward and reverse directions, and a pen head mechanism that can reciprocate in a direction parallel to the axis of the platen. A fixed pen holder is provided in which the plurality of pens are arranged in a radial manner so that the plurality of pens are concentrated, and the plurality of pens are slidable only in their respective longitudinal directions, and a desired pen is selected. a pressing means for pressing the pressed pen against the recording paper, and a position detection control section connected to the pressing means to rotate the pressing means, detecting the position of the pressing means and controlling the rotation. A pen-type recording device comprising: a motor means, wherein a desired pen is selected by the pressing means by rotating the pressing means by a predetermined angle under control of the position detection control section.