Mutoh Industries Ltd.

Toshiaki Matsushima

The method of winding paper onto a take-up roller of an automatic drafting machine, according to the present invention, involves the avoidance of winding the paper after each and every drafting operation. Rather, the method contemplates that, after each drafting operation, it will be determined whether the amount of paper, which has been driven forwardly after being utilized in a drafting operation and which has not yet been wound onto the take-up roller, is greater than a predetermined limiting value. If it is not, then no winding operation takes place. If, however, it is greater than the limiting value, a length of the paper equal to the length forwarded since the last winding operation is wound upon the take-up roller. After each such winding operation, the sequence of the method is repeated.

Method of winding paper onto a take-up roller of an automatic drafting

A control method controls a sheet-driven type automatic drafting machine to allow for drying of an inking medium disposed on a drafting sheet. The automatic drafting machine is of a type which includes a platen upon which a drafting sheet is conveyed in a feed direction and a line-drafting head which is conveyed in a line direction perpendicular to the feed direction. The line-drafting head is adapted to accommodate at least one writing instrument from among a plurality of writing instruments located in a stocker. The control method includes a step of storing in a memory a drying time associated with the inking medium of each of the plurality of writing instruments, a step of determining which of the plurality of the writing instruments is accommodated by the line-drafting head, a step of reading from the memory a drying time associated with the one of the plurality of the writing instruments accommodated by the line-drafting head, and a step of controlling the conveyance in the feed direction of the drafting sheet in accordance with the thus read drying time. The identity of each writing instrument is determined by either sensing an identification mark on the writing instrument or by referencing a location of the writing instrument within the stocker.

Control method of sheet-driven type automatic drafting machine

A method of operating an automatic drafter for producing a long drawing having successive parts, in which, after drawing on a long sheet a preceding frame of the drawing corresponding to a preceding part of the long drawing, the area in which the next frame is to be drawn is expanded by moving the leading edge of the area to form a portion overlapping the trailing portion of the preceding frame. Then the lines of the trailing portion of the preceding frame which are to extend across the junction between the successive parts of the sheet in the overlapping portion are redrawn and then continued in the next frame while drawing the remainder of the lines in the next frame on the sheet in the remainder of the area in which the next frame is to be drawn.

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Tokyo, Japan

Toshiaki Matsushima