| 摘要 |
A machine for tensioning and nailing a canvas on an artists' frame comprising four sidewalls (3, 4, 5, 6) defining a working station (7) with canvas stretching tongues (12) having a high coefficient of friction on the upper canvas supporting face and a low coefficient of friction on the opposite lower face. The nailing step is accomplished by means of nailing units (14) which receive the nails (17) from to and fro sliders (48) movable on said sidewalls and which, in turn, receive the nails (17) from vibrating nail feeders (49) during the return of said sliders (48) by means of nail drawing and synchronism units (105). The canvas (10) and superimposed frame (11) can be lowered from a supporting plane in the working station (7) into a nailing plane by means of a number of lever-like swivellable pressing arms (119) which are removably fixed to a respective driving shaft (115) supported on a respective sidewall (3, 4, 5, 6).
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