JPH061509A - Detecting method for remaining amount of paper roll in automatic drafting machine and the like - Google Patents

Abstract

PURPOSE:To provide a displaying method for the remaining amount of a paper roll which can easily correspond to various kinds paper rolls. CONSTITUTION:In the case of drawing out a paper roll onto a working face, the radius (r) of the rolled part of the paper roll is determined from the above drawing out amount and the revolving quantity corresponding to the drawing out amount of the rolled part 4. Next, the area S of the side except a core body of the rolled part is determined from the radius (r) of the rolled part and the value Q of the diameter of its core body 5. Next, the number of paper leaves which have an area of (d)mm<2> being the same in value as the product of 1mm in length and (d)mm in width, namely the thickness of the paper, and can be taken from the side having an area S of the rolled part is computed, and the value of computation is displayed as the remaining amount of the machine glaced paper 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the remaining amount of roll paper in a paper driven automatic drafting machine using roll paper.

[0002]

2. Description of the Related Art Conventionally, the remaining amount of roll paper used in a paper drive type automatic drafting machine or the like is detected mechanically, and as shown in JP-A-3-195660, the roll paper is fed. There is a method of obtaining the current roll paper radius from the amount and the rotation amount of the roll paper supply side support roller at that time.

[0003]

However, the method of mechanically detecting the remaining amount of roll paper has a defect that the remaining amount cannot be accurately detected. Further, according to the latter method, in order to accurately detect the remaining amount of the roll paper, it is necessary to tabulate the radius from the initial radius of the roll paper to the rotation amount of the roll unit and the corresponding remaining amount in the storage device. Therefore, there is a defect that many tables must be prepared for each paper type. The invention aims to eliminate the above defects.

[0004]

In order to achieve the above object, the present invention rotatably supports a roll portion of roll paper on a supply-side roll paper support means and pulls out the roll paper to feed it onto a work surface. In the automatic drafting machine, etc., the initial settings for inputting the thickness of the roll paper and the diameter of the core of the roll paper to the controller and the amount of roll paper pulled out when the roll paper is pulled out onto the work surface Calculating the radius of the roll portion from the amount of rotation of the roll portion of the roll paper, determining the side surface area of the roll portion of the roll paper from the thickness of the paper and the diameter of the core, the roll A step of calculating how many times the area of the side surface of the section is 1 mm in length and the area of a piece of paper whose width corresponds to the thickness of the roll paper, and the calculation result is displayed as the remaining amount of roll paper. And the process of .

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. Reference numeral 2 denotes a supply side roll paper support means composed of a roller shaft rotatably supported between legs 6 and 8 of the paper drive type automatic drafting machine 4 shown in FIG. The paper tube 12 around which is wound is detachably supported.

A disk 14 is fixed to the supporting means 2,
On the outer peripheral portion of the disk 14, a large number of slits 16 for detecting the rotation amount of the disk 14 are provided at equal intervals as shown in FIG. Reference numeral 18 is a light transmission type sensor that detects the slit 16 and outputs it as a pulse signal, and the output end of this sensor is connected to a controller composed of a computer via a waveform shaping circuit. The controller is built in a box 20 provided in the machine body of the drafting machine 4 and can be connected to a host computer (not shown) that constitutes CAD.

Based on the pulse signal from the sensor 18, the controller counts the rotation amount of the disk 14, that is, the rotation amount of the roll portion of the roll paper 10, and the roll paper 1
A program for measuring the radius r (see FIG. 5) of the roll portion of the roll paper 10 based on the amount of roll paper pulled out and the amount of rotation of the disk 14 when 0 is pulled out in the winding direction is incorporated. The pull-out amount of the roll paper 10 can be calculated by counting the output pulse of a known encoder linked to the paper drive roller of the paper drive type automatic drafting machine 4 by the counter of the controller. For example, roll paper 10 with 10c
If the disk 14 rotates 40 degrees when it is pulled out,
Therefore, if you rotate the disc 360 degrees, roll paper 1
It can be seen that the pull-out amount of 0 is 90 cm. Circumference of a circle
From the formula of l = 2πr, r = L / 2π, and in this case, l is 90 cm. Therefore, the radius r of the roll portion of the roll paper 10 is r.
Is r = 90 / 2π. Portion 10a of the roll paper 10 supported by the supporting means 2 and rolled out from the roll portion.
Is configured to be taken up by a take-up shaft 24 linked to a take-up motor through the upper surface of the sheet placing member 22 of the automatic drafting machine 4 and between the drive roller and the pressure roller.

The box 18 is provided with an operation panel 26 for a controller. Next, a method of detecting the remaining amount of roll paper will be described below with reference to the flowchart of FIG. First, the roll portion of the roll paper 10 is set on the roll paper supporting means 2, and the roll paper 10 is pulled out to be sandwiched between the drive roller and the pressure roller and the front end is fixed to the winding shaft 24. The controller starts the roll paper remaining amount detection operation from label 1 in FIG. In step 2, the operator inputs the radius Q of the paper tube 12 and the thickness d of the roll paper 10 into the controller from the operation panel of the controller to perform initial setting. Next, in step 3, the controller rotationally drives the drive roller to roll out the roll paper 10 at a constant speed for one drawing onto the paper placing member 22 of the automatic drafting machine to prepare for the drawing operation.

At this time, the controller executes step 4
Then, the radius r of the circle of the roll portion of the roll paper 10 is calculated.
Next, in step 5, the controller calculates a value obtained by subtracting the side surface area of the paper tube 12 from the area of the circle of the roll portion having the radius r, that is, the side surface area S of only the roll portion of the roll paper 10. The side surface area S of the roll portion can be calculated by the following formula. S = π (r ² −Q ² ) Next, in step 6, the controller determines 1 mm in width and dmm in width.
That is, it is calculated how many pieces of paper 10 ′ having an area of d mm 2 can be taken from the side surface area of the roll portion of the roll paper 10, and the calculated amount is used as the amount of the roll portion of the roll paper 10, that is, the remaining amount of the roll paper 10. . This remaining amount L is L = π (r ²
It can be calculated by −Q ² ) / d. The controller is
In step 7, the roll paper 10 is displayed on the display unit of the operation panel 26.
The remaining amount L of is displayed. Next, the controller determines in step 8 whether or not to continue drawing, and if affirmative, returns to step 3, and if negative, terminates the roll paper remaining amount display program.

[00010]

[Effect] Even if the type of roll paper, such as the total length and thickness, changes, the amount of remaining paper can be detected by initializing the thickness of the paper and the diameter of the core, so various types of paper can be used easily. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a flowchart.

FIG. 2 is an external view of a paper-driven automatic drafting machine.

FIG. 3 is an external view of roll paper support means.

FIG. 4 is a front view of a disk.

FIG. 5 is an explanatory diagram.

[Explanation of symbols]

 2 Roll Paper Supporting Means 4 Automatic Drafting Machine 6 Leg 8 Leg 10 Roll Paper 12 Paper Core 14 Disc 16 Slit 18 Sensor 20 Box 22 Paper Placement Member 24 Rewind Axis 26 Operation Panel

Claims (1)

[Claims] 1. The thickness of the roll paper in an automatic drafting machine or the like in which a roll portion of the roll paper is rotatably supported by a supply-side roll paper support means and the roll paper is pulled out and supplied onto a work surface. And the value of the diameter of the core of the roll paper is input to the controller, and the roll unit is calculated from the amount of roll paper pulled out when the roll paper is pulled out onto the work surface and the rotation amount of the roll unit of the roll paper. A step of calculating a radius of the roll paper, a step of obtaining a side surface area of the roll portion of the roll paper from the thickness of the paper and a diameter of the core body, a side surface area of the roll portion is 1 mm in the vertical direction, and a side is a roll paper. A method for detecting the remaining amount of roll paper, which comprises a step of calculating how many times the area of a piece of paper having a length corresponding to the thickness is calculated, and a step of displaying the calculation result as the remaining amount of roll paper.