| 摘要 |
This invention relates to an apparatus to stretch elastic and non-elastic bands to be applied to furniture frames, characterized in that it provides for: one or more belt-feeding bobbins; a roller rotating on its own axis; a bar applied to said roller at such a distance as to enable the inserting, between the bar and the roller, of the belts being then bent backwards in order to be fixed to the furniture frame; an arm controlling the rotation of said roller; a piston activating said arm; devices fit to regulate the pressure of the fluid activating said piston. With respect to the known solutions, in which the amplitude of the rotation of the roller was determined by means of a mechanical stopping device and regardless of the force applied to it, in the apparatus according to the invention the pressure of the fluid controlling the rotation of the roller is regulated in such a way as to enable an automatic adjustment of the stretching according to the pressure set and then to the tensile strength of the different types of elastic belt to be stretched
|
