JPS5828286Y2 - digitizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digitizer in which a position display head equipped with a cursor is manually moved.

The present invention has a position indicating head equipped with a cursor that can be moved in the X and Y axis directions by the reeling yarn, and a strain gauge is connected to this reeling yarn, so that when the position indicating head is manually moved, the reeling The strain gauge detects the change in tension in the thread, moves the position indicating head so that the change in tension becomes zero, and moves the bottom of the bellows to follow the pressing direction of the cursor to determine the coordinates of the target position. We are trying to create a digitizer that can digitize and output.

The present invention will be explained in detail below with reference to the drawings. Fig. 1 is an explanatory block diagram showing one embodiment of a digitizer according to the present invention.

Reference numeral 10 denotes a position reading section, which includes a carriage 11 that is movable in the X-axis direction.

A position indicating head 12 is attached to the carriage 11 so as to be movable in the tI'iY-axis direction, and a cursor 13 is integrally attached to the head 12.

More specifically, as shown in FIG. 2, the carriage 11 is connected to the pulley 16a by the reeling yarn 14VC.

16b, and is driven in the X-axis direction by the rotation of the pulley 16a that is linked to the motor 24a.

U strain gauges 15a and 15b are inserted and connected to the reeling yarn 14 so as to face each other so as to sandwich the carriage 11 therebetween.

The head 12 is connected to pulleys 19a and 19b which are rotatably attached to the carriage 11 by the reeling line 17, and is driven in the Y-axis direction by the rotation of a motor 24b.

The strain gauges 18a and 18brj are inserted and connected to the reeling line 17 so as to sandwich the head 12.

The mounting positions of the strain gauges 15a, b and 18a, b are not limited to those in the embodiment.

button, reeling line 14.17 and pulleys 16a, 16b,
19a.

19b so that there is no slippage between them.

The electric signals XI, X2 and yl, y2 corresponding to the strains of the strain gauges 15a, 15b and 18a, 18b are sent to the amplifier 21.
a 21d to the control unit 22.

The control unit 22 detects the amount of change in the distortion signal X1sX2mV+ +Vz·, and drives the motors 24a, 24b via the drive circuits 23a, 23b until the amount of change becomes zero.

That is, for example, when moving the cursor 13 to the right in parallel with the X axis, 1. Strain gauge 15ar! Stretched in the reeling direction and compressed by strain gauge 15bri ~X1. The X2 signal changes.

In this case, no force is applied to the cursor 13vc in the Y-axis direction, so there is no change in the yl and y2 signals.

X 1 * X 2 Signal change ε1. A drive signal is given to the drive circuit 23aK corresponding to the presence or absence of ε2, and the change ε
8. The motor 24a rotates so that ε2 becomes zero, the reeling line 14 moves via the pulley 168, and the carriage 11
be moved to the right.

When the head 12 is to be moved in the Y-axis direction, it can be moved in the same manner as described above.

In this way, when a pressing force that can be resolved in the XYY axis directions is applied to the cursor 13, the carriage 11 and head 12 automatically move so that this pressing force is not applied to the strain gauge.

In this way, it is possible to manually move the cursor 13 directly to the target position, digitize and output the coordinates.

The material of the threads 14 and 17ri in the embodiments is not limited to thread, but may be plastic, metal, or a combination thereof.

As explained above, according to the digitizer of the present invention,
Changes in the tension of the reeling line connected to the position indicator head are detected by a strain gauge connected to the reel line, and the position indicator head can be automatically moved so that the amount of change becomes zero, so move it to the cursor. By simply applying a pressing force in the direction, the head can be easily moved in response to the pressing force.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a main part of an embodiment of a digitizer according to the present invention, and FIG. 2 is a detailed diagram of the position reading section of FIG. 1. 10... Position reading unit, 11... Carriage, 1
2...Position indication head, 13...Cursor, 14°17-...Reeling thread, 15a, 15b, 18a, 1
8b...Strain gauge, 16a, 16b, 19a
, 1 sb-Goo'J-121a-d...Amplifier, 22...Control unit, 23a, b...Drive circuit,
24 a m b...motor.

Claims (1)

[Scope of utility model registration request] It is equipped with a cursor for position indication, and a position indication head that is connected to a reeling thread and can be moved on the recording paper surface by driving the reeling thread, and the cursor is moved along the figure on the recording paper surface to digitize the drawing. The digitizer is sensitive to the tension of the reeling yarn and is equipped with strain gauges that are inserted and connected to a part of the reeling yarn so as to be opposite to each other with respect to the position indicating head, detect changes in the output of these strain gauges, and A digitizer characterized in that the position display head can be moved in accordance with the pressing force applied to the cursor so that the amount of change becomes zero.