| 摘要 |
FIELD: mechanical appliances for drawing work, particularly, devices for drawing parallel lines at any angle. SUBSTANCE: mechanism has drawing board, four rollers installed in corners of drawing board, closed flexible member embracing rollers and forming vertical and horizontal parallel to edges of drawing board, rule secured with its ends to respective branches of flexible member and counterweight provided additionally with a pair of rollers installed in two corners of drawing board, and closed flexible member embracing this pair of rollers and forming two horizontal branches. In this case, middle horizontal branches are interconnected, and secured to extreme horizontal branches of flexible members are vertically installed rule having guide groove and analogous mechanism which consists of rollers installed in pairs on rule ends, and two closed flexible members embracing pairs of rollers and forming two vertical branches for pair. One branch of each flexible member is located in the groove and interconnected by means of counterweight and the second branches of flexible members are located outside of the groove, and fastened to them is carriage with drawing rule. EFFECT: higher efficiency. |
