| 摘要 |
A jig which receives a sheet in a selected position to accurately scribe it in a straight line. The jig has front and rear panels which form a vertical slit between them in which the sheet is received. The bottom of the sheet sits on an elongated support bar which extends horizontally in the slit and the line is scribed by running a scribing tool along the upper scribing edge of the front panel. The support bar has a pair of spaced studs which extend out through matching openings in the front panel to allow the support bar to be manually moved between a number of different vertical positions to select the distance the line is scribed from the bottom of the sheet. The openings in the front panel each have a number of spaced slots extending sideways which provide a pair of notches in which the studs are seated in each position. The studs are threaded to receive a retaining knob which are tightened against the front panel to secure the support bar in the selected position.
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