| 摘要 |
FIELD: devices for drawing of parallel lines in a preset internal and provide for possibility of synchronous setting of the size of type in two mutually perpendicular directions and drawing lines of lines with observation of respective ratio between heights of capital and small letter. SUBSTANCE: drawing device has rule with working faces longitudinal link with working face and two lateral links joined to form parallel link mechanism whose lateral links carry soughing hair located parallel to rule faces and longitudinal link. Rule is made in form of triangle attached to limb-like fork of turning mechanism and furnished with additional longitudinal link, middle with lateral link, three sighting hairs secured to respective links, strips, secured to ends of triangle, reading off means and retainer. All links and sighting hairs are located on the outer side of triangle. Extreme lateral links are connected with strips in points coinciding with external working faces of triangle. Middle link is connected with fork in point coinciding with external vertex of triangle. Extreme lateral links and middle lateral link and connected with longitudinal links in points coinciding with working faces of longitudinal links. Distances between external working faces of triangle and working faces of longitudinal links and distance from them to respective sighting hairs are related with preset relation. Middle lateral link is made in form of rectangular sector, on whose median, retainer bolt is installed which passes through curved slot made in fork. Screwed on bolt is retaining head. Besides, reading-off means is made in form of scale indicator freely installed on retainer bolt and on screw head which connects the middle lateral link with fork, and scale is made on fork from the point coinciding with external vertex of triangle. EFFECT: higher efficiency. |
