JPH0331586Y2 - - Google Patents

Description

[Detailed Description of the Invention] Background of the Invention (Field of Industrial Application) The present invention is capable of drawing lines such as straight lines, curved lines, and broken lines and measuring the length of the lines at the same time.
Or it relates to a writing instrument that can draw a line of a desired length.

(Prior Art) There has been no writing instrument that can measure the length of a line at the same time as it is drawn, or that can draw a line of a desired length without placing a mark in advance. There have only been a few proposals for a hand-held simple length measuring meter or kirubimeter that directly measures the length of a line that has already been drawn. Moreover, these length measuring meters are not satisfactory in terms of measurement accuracy and measuring instrument sensitivity, as described below.

A simple hand-held length measuring meter was proposed to eliminate the measurement errors and laborious work that were common in indirect measurement using a linemeter. The basic structure is to calculate the length of the line to be measured by converting it into the amount of rotation of the rotating body and counting the pulses generated each time the rotating body rotates by a predetermined amount, and displaying it. . However, in the case of a hand-held length measuring meter, in order to move the length measuring meter while accurately tracing the line to be measured, it is necessary to eliminate blind spots in the roller part at the tip, and for this purpose, the body of the length measuring meter is made into a so-called pencil shape. It is difficult to provide a pulse generating means on the roller itself, since a large diameter roller is not suitable for accurately tracing the line to be measured, so a small diameter roller has to be used. Therefore, all conventional length measuring meters use a gear train to transmit rotation from a roller at the tip to a pulse generating means at the rear to generate an electric signal corresponding to the amount of rotation. Therefore, the length measuring meter is unable to avoid measurement errors caused by the backlash of the gear.
Even if a highly accurate pulse signal generating means such as an encoder is used, the accuracy cannot be improved. In addition, in the case of a length meter that uses a pulse generation means that combines a light emitting diode and a phototransistor,
Since the holes that allow light to pass through must be accurately drilled at appropriate intervals, the minimum amount of change that can be detected by the measuring device becomes large and only rough measurements can be made. Of course, it is possible to increase the sensitivity of the length measuring meter mentioned above by combining many gears and increasing the rotation ratio.
On the contrary, errors due to bumps increase, and the body becomes larger, making it difficult to handle.

In this way, in the past, not only were there writing instruments that could measure the length of a line at the same time as writing it, or draw a line of a desired length, but there were also tools that could precisely measure the length of the line. I can't even find a length measuring meter that can measure with good sensitivity.

Purpose of the invention The purpose of the invention is to provide a writing instrument that can measure the length of a line at the same time as writing the line, or draw a line of a desired length without transferring the dimensions from the linearizer. purpose.

Another object of the present invention is to improve measurement accuracy.

Structure of the invention (Summary of the invention) In order to achieve the above object, the writing instrument of the invention includes a holder, a writing means held in the holder, and a roller that is adjacent to the writing means and rolls along a writing trajectory. an endless magnetic belt on which a linearity scale is magnetically written and is rotationally driven by the roller; a reading unit that reads the magnetic linearity scale of the rotating magnetic belt and outputs a pulse signal; and this reading unit. It consists of a counting circuit that counts output pulses from the counting circuit, and a display section that digitally displays the measured value based on the counter output from the counting circuit.

Further, in the writing instrument of the present invention, the writing means is elastically supported by the holder so as to be able to move slightly in the axial direction, and is provided so as to constantly contact the writing surface together with the adjacent roller even if the inclination of the holder changes.

Furthermore, the writing instrument of the present invention is provided with a writing means that can be moved in and out of the holder, and can be used only as a length measuring meter.

(Specific Description of the Invention) The configuration of the present invention will be described in detail below based on an embodiment shown in the drawings.

FIG. 1 shows an embodiment of the writing instrument according to the present invention in a central vertical cross-sectional view. This writing instrument has a writing means 1 and a roller 2 adjacent to each other at the tip of a holder 3, a magnetic belt 4 as a standard scale on which a linearity scale 8 is magnetically written, and a linearity scale on this magnetic belt 4. A reading unit 5 that reads 8 and outputs pulses, a counting circuit 6 that counts the output pulses, and a display unit 7 that digitally displays the measured value based on the counter output from the counting circuit 6 are housed in the holder 3. However, the length of the line is simultaneously measured by driving a magnetic belt 4 with a roller 2 at the tip of the holder that rolls as the writing means 1 moves.

Writing means 1 include a ballpoint pen, a felt pen,
Leads for mechanical pencils, fountain pens, scribing needles, etc. are appropriately selected depending on the purpose. This writing method 1
is elastically supported by the holder 3 and is slightly movable in the axial direction, and is provided so that it can constantly contact the writing surface together with the roller 2 even if the inclination of the holder 3 is changed. The writing means 1 in this embodiment is a ballpoint pen, and a spring 11 is installed between a stopper 9 provided near the tip of the pen and a bracket 10 slidably attached in the holder 3. Therefore, it is elastically supported by the holder 3. In addition, the above-mentioned bracket 1
0 is connected to a changeover switch 14 outside the holder by a plate 13 passing through a slit 12 bored in the holder 3. Therefore, by operating a switch on the outside of the holder 3, the bracket 10 is slid in the axial direction, and the supporting writing means/ballpoint pen 1 can be moved in and out of the holder 3.
On the other hand, a coil compression spring 15 is provided between the bracket 10 and the holder 3 and acts in the direction of movement of the writing means 1, so as to constantly apply a force to draw the writing means 1 into the holder 3. There is. Further, the bracket 10 has a protrusion 16 projecting into the slit 12 of the holder 3, and is provided so that the writing means 1 is fixed at the extended position unless the changeover switch 14 is pressed against the holder 3 side. In addition, the insertion and removal of the writing means 1 is to protect the writing means itself and to enable its use alone as a length measuring meter, and is not limited to being carried out only by the above-mentioned mechanism. It's not a requirement. Of course, if the writing device 1 is to be fixed and cannot be taken out or taken out, or if sufficient consideration must be given to drying, a protective cap 17 may be provided to cover the tip of the holder 3. preferable. Further, in the case of a writing device 1 that requires relatively strong writing pressure, such as a scribing needle, it is preferable that the writing device 1 is fixed to the holder 3 without being elastically supported.

The roller 2 is rotatably fixed to the tip of the holder 3 by a shaft 18. This roller 2
rolls along a line written by an adjacent writing means 1, and a magnetic belt 4 coaxially rolls along a line written by an adjacent writing means 1.
It has a drive pulley 19 that hangs. Although the roller 2 and the drive pulley 19 can be molded separately and connected, it is preferable to mold them integrally from plastic. More preferably, the outer peripheral surface of the roller 2 is provided with fine serration-like irregularities 20 or coated with a material having a high coefficient of friction, such as rubber, in order to eliminate slippage. In addition, by forming a slightly deformable rubber layer on the outer peripheral surface of the roller 2, or by supporting the roller 2 itself so that it can move slightly in the axial direction of the holder 3 and applying a force of a spring (not shown), it is possible to write. There is no need to elastically support the means 1 side. In addition, magnetic belt 4
The drive pulley 19 on which the belt 4 is hung preferably has a flange to prevent the belt 4 from coming off. Also,
Although not shown, holes may be drilled at a constant pitch on the magnetic belt 4 side, and a sprocket portion that meshes with the holes may be provided on the drive pulley 19 to completely eliminate the risk of the magnetic belt 4 slipping.

As shown in FIG. 4, a linearity scale 8 in a desired unit is magnetically written on the magnetic belt 4 as digital information. In this case, the amount of rotation of the roller 2, that is, the length of the line, and the amount of movement of the magnetic belt 4 do not have a 1:1 correspondence if the diameters of the roller 2 and the drive pulley 19 are not the same. Writing interval/pitch P of scale 8 based on the relationship
is required. For example, if the diameter of roller 2 is 7 mm,
When the diameter of the pulley 19 is 5 mm, one rotation of the roller 2 measures a line length of approximately 21.98 mm, whereas the actual movement of the magnetic belt 4 is 15.7 mm.
mm. Therefore, in this case, when the roller 2 rotates by 1 mm, the magnetic belt 4 will move approximately 0.714 mm.
Since it moves, if the minimum measurement unit is 100 μm, it is sufficient to write digital information at a pitch of 71 μm. In addition, when recording digital information, the type of information is only binary, and it is necessary to reliably distinguish between them. Therefore, magnetization, that is, positive and negative magnetic saturation, which can best distinguish the state of the recording medium, is used. Saturated magnetic recording is preferred.

As the magnetic belt 4, it is preferable to use a material that has good dimensional stability and durability with little expansion and contraction that is difficult to deal with tension, heat, and moisture, such as a magnetic film based on Mylar (polyethylene glycol terephthalate film) or polyester film. It is. This magnetic belt 4 is attached to the holder 3
The drive pulley 19 coaxially with the roller 2 at the tip of the roller 2 and the rotatable idle pulley 32 installed in the holder 3 rotate under constant tension. still,
Since the magnetic belt 4 is not intended to transmit rotation, tensile strength does not pose a problem. but,
The idle pulley 32 is supported by the plate 31 as described later so that it can be rotated with an extremely slight force in order to reduce the burden of tension on the magnetic belt 4.

It is also practically possible to write the linearity scale 8 by punching holes or slits in a fully magnetized film. Of course, in this case, the recording density will be coarser than in the case of normal magnetic writing, so the minimum measurement unit will be larger than in the above-mentioned magnetic recording.

As the reading section 5 which reads the linearity scale 8 of the magnetic belt 4 and outputs pulses, it is preferable to employ a magnetic head or a magneto-electric element such as a Hall element. This reading section 5 outputs one pulse every time it reads one scale of the linearity scale 8 written on the magnetic belt 4. The output terminal of this reading section 5 is connected to the enable terminal of the first-stage BCD counter 6. Therefore, the counting operation of the counter 6 is started by the output pulse from the reading section 5 while the counter reset is released. Although not shown, if the output voltage and output current of the reading section 5 do not match the input conditions of the counter 6, the reading section 5 is
It is only necessary to connect the counter 6 and the counter 6.

The most common counting circuit 6 is a binary coded decimal counting circuit using a BCD code. The number of counters 6 required corresponds to the number of digits of the display device/display 22. For example, in the case of displaying four digits, four counters are required, and each counter is interlocked for carrying. Furthermore, since the decimal counting circuit incorporating carry output, reset function, and preset function is realized with a low power consumption CMOS element, it is suitable to use this in order to make the mounting space more compact. It is. Further, the reset switch 23 of the counting circuit 6 needs to be installed in a position where there is no risk of erroneous operation. For example, the counter 6 may be reset at the same time as the rear end of the holder 3 or the changeover switch 14 of the writing means 1 is used to project the writing means 1 from the holder 3. Of course, reset switches 23 are provided at the rear end of the holder 3 and the changeover switch 14 of the writing means 1, respectively, so that the counter can be reset by operating the reset switch 23 at the rear end of the holder except when the writing means 1 is inserted or taken out. It's okay.

As the display circuit (display unit) 7 that displays the measured value based on the counter output from the counting circuit 6, it is preferable to use a liquid crystal circuit or a light emitting diode circuit in terms of compactness. In particular, it is preferable to use a liquid crystal display with low power consumption and long life. A display/liquid crystal display 2 constituting the display circuit 7
For 2, a 7-segment numerical display is preferred;
A suitable driving method is a dynamic method which has a small number of parts and does not take up much mounting area. Of course, this does not preclude the adoption of the static system or the adoption of other display circuits. This display circuit 7 is a decoder IC that decodes a 4-bit code into 7 segments.
It can be easily configured by using 21.
Note that when the decoder output is input to the display 22, it may be amplified through a driver (not shown).

The aforementioned reading section 5, counting circuit 6 and display circuit 7
Each circuit is mounted on one printed circuit board 24 and housed in the holder 3. When considering the space inside the holder, it is preferable to use a hybrid circuit.

In the figure, reference numeral 25 is a clip, and 26 is a battery. As the battery 26, it is most common to use a small battery that can be housed in the holder 3, such as a button-type battery that is a miniaturized version of a conventional mercury or silver oxide battery. It is also possible to use other types of batteries such as silicone batteries (so-called solar cells). The battery is turned on and off by operating a separate battery switch 27 or a switch that also serves as the changeover switch 14 of the writing means 1. A holder 3 that accommodates the aforementioned magnetic belt 4 and each circuit 5, 6, 7, etc.
The cap 28 has a pencil shape for convenient use, can be split at at least one point to incorporate the magnetic belt 4, etc., and has a cap 28 that can be easily attached and detached to replace the built-in battery 26. . In the case of this embodiment, a second writing means 29 is provided in the cap 28 portion, and a protective cap 30 is further provided.
I try to cover it with The shape of the holder 3 is most preferably a pencil shape because it has few blind spots and is easy to hold, but other shapes may be used as long as no blind spots occur at the tip.

Each of the above-mentioned circuit brushes 5 accommodated in the holder 3,
It is desirable that the writing device 6, 7, writing means 1, etc. be made as compact as possible and integrated into one unit. Therefore, although not shown, a hybrid IC formed by the above-mentioned circuits is installed on the printed circuit board 24.
The printed circuit board 24 is mounted on a plate 31 that can be fixed inside the holder 3. A roller 2 and an idle pulley 32 are rotatably attached to the plate 31, and a magnetic belt 4 is stretched over the plate 31, while a writing means 1 is provided on the back surface of the tip end. Each circuit 6, 7, reading section 5, magnetic belt 4, roller 2, and writing means 1 are assembled in the holder 3 as one unit. The reading unit 5 mounted on the printed circuit board 24 is placed in contact with or very close to the magnetic belt 4 mounted on the plate.

Although not shown, if the system is configured to be controlled by a single-chip microcomputer-type CPU, it is possible to incorporate calculation functions, clock functions, memory functions, preset functions, etc. in addition to the measurement functions mentioned above. . In this case, all signal control processing is done by the built-in
This is performed by the CPU, and the data such as length measurement function, clock function, and calculation function, as well as the address bus, are switched depending on the purpose. Furthermore, the desired length is stored in the memory element of the microcomputer and the roller 2 is
When a line segment of an arbitrary length is traced or a line segment of an arbitrary length is written using the writing means 1, a preset memory function is provided to notify this by lighting a lamp or generating a sound. You can measure and draw a line of desired length, and even do it in duplicate.
Therefore, it can also be used for dimensional inspection of products.

FIG. 6 shows another embodiment. In this writing instrument, the display 22 of the display section 7 is tilted at 45 to 90 degrees with respect to the axis of the holder 3, so that the display 22 can be easily viewed while writing a line.

Effects of the Invention As is clear from the above explanation, the writing instrument of the present invention includes a holder, a writing means held in the holder, a roller that is adjacent to the writing means and rolls along a writing trajectory, and a linearity scale. an endless magnetic belt on which is magnetically written and rotationally driven by the roller;
A reading section that reads the magnetic linearity scale of the rotating magnetic belt and outputs a pulse signal, a counting circuit that counts the output pulses from this reading section, and a counter output from this counting circuit to display the measured value. Since it is constructed with a display section that allows you to draw a line, you can measure the length of the line at the same time, and you can also draw a line of a desired length. Moreover, the length measuring mechanism of the present invention does not use gears to transmit rotation, but instead drives an endless magnetic belt in an unloaded state by a roller that rolls along a writing trajectory, and measures the linearity written on the belt. Since the line length is measured by reading the thickness, measurement error factors such as backlash are eliminated, improving measurement accuracy.

In addition, in the writing instrument of the present invention, if the writing means is elastically supported so as to be able to move slightly in the axial direction with respect to the holder, even if the inclination of the holder changes, that is, when writing a line other than a straight line, such as a polygonal line or a curved line, or Even if there are individual differences in how the holder is held, the adjacent rollers and writing means will constantly contact the writing surface, so that measurements and handwriting will not be interrupted.

Furthermore, in the writing instrument of the present invention, if the writing means is provided so that it can be moved in and out, the writing means can be retracted into the holder to protect it when not in use, and it can also be used alone as a length measuring meter.

[Brief explanation of the drawing]

Fig. 1 is a central vertical sectional view showing one embodiment of the writing instrument according to the present invention, Fig. 2 is a sectional view showing the structure of the tip of the writing instrument, Fig. 3 is a front view of the tip of the writing instrument; FIG. 4 is a plan view showing the linearity scale of the magnetic belt, FIG. 5 is a block diagram of the measuring section, and FIG. 6 is a perspective view showing another embodiment of the writing instrument. DESCRIPTION OF SYMBOLS 1...Writing means, 2...Roller, 3...Holder, 4...Magnetic belt, 5...Reading section, 6...
Counting circuit, 7... Display section, 8... Linearity scale, 19
...Drive pulley, 22...Display, 26...
…battery.

Claims (1)

[Claims for Utility Model Registration] (1) A holder, a writing means held in the holder, a roller that is adjacent to the writing means and rolls along a writing trajectory, and a linearity scale on which a linearity scale is magnetically written. an endless magnetic belt that is rotationally driven by the roller; a reading unit that reads a magnetic linearity scale of the rotating magnetic belt and outputs a pulse signal; and a counting circuit that counts output pulses from the reading unit; A writing instrument characterized by comprising a display section that displays a measured value based on a counter output from the counting circuit. (2) Utility model registration The writing means according to claim 1 is elastically supported by the holder so as to be able to move slightly in the axial direction, and is constantly in contact with the writing surface together with the adjacent roller even if the inclination of the holder changes. A writing instrument characterized by the ability to (3) A writing instrument characterized in that the writing means according to claim 1 or 2 of the utility model registration claim is provided in the holder so as to be able to come in and out.