| 摘要 |
A felting procedure, in which a fibre structure (10) is advanced under a reciprocating felting head (24) with needles (28), has the instantaneous speed of advance decreasing in response to the penetration of the needles into the structure and increasing after the needles withdraw, so that the force applied to the needles by the structure is limited without completely interrupting the advance during the whole duration of the needles' presence in the structure. A felting procedure, in which a fibre structure (10) is advanced under a reciprocating felting head (24) with needles (28), has the instantaneous speed of advance decreasing in response to the penetration of the needles into the structure and increasing after the needles withdraw, so that the force applied to the needles by the structure is limited without completely interrupting the advance during the whole duration of the needles' presence in the structure. The advance of the fibre structure can be produced by a constant-speed motor and a transmission system with a belt, tensioner roller and a variable-pressure pneumatic damper. It has mechanical clearance able to absorb the decrease in the speed of advance created by a resistance exercised by the penetrating felting needles. The decrease in the speed of advance with the needles' penetration is compensated for by an acceleration after they have withdrawn. |
