Roller shutter drive with travelling wave

Roller shutter drive with a travelling shaft (30) and a travelling shaft bearing housing (10) for mounting, advancing and guiding the travelling shaft in a head rail (9) of a louvre blind with slats held in cords such as ladder cords or loop cords;

• wherein the travelling shaft (30) is rotatably and horizontally displaceably mounted in the travelling shaft bearing housing and wherein
• the discs are held in cords such as ladder cords or loop cords, and wherein
• the travelling shaft bearing housing (10) has a tubular or circular channel cross-section for the travelling shaft bearing and
• a projection (12) for guiding a winding cord (19) of the louvre blind, wherein the projection has a central slot with a convexly curved sliding surface, through which the winding cord (19) can be guided to the outer diameter (AD) of the travelling shaft with little friction and can wrap around the outer diameter of the travelling shaft or can rest on the travelling shaft, wherein
• a cord, a ladder cord loop or a loop cord loop (32) of the louvre blind can be arranged on the travelling shaft between the winding cord winding (26) and the channel cross-section of the travelling shaft bearing housing (10), and wherein
• the width B of the projection (12) is equal to or narrower than the outer diameter AD of the travelling shaft, and
• wherein a cord, a ladder cord loop or a loop cord loop (32) of the louvre blind for supporting or wrapping around the travelling shaft can slide past the projection without touching it, and
• wherein the travelling shaft housing (10) is locked in the head rail (9) by means of a fitting