它提出了一种返回行程锁百叶帘，其中，在移动滑架（5）Ansperrklinke（15）设置在滑架（5）被安装成使得所述距离（RA，RB）（终端的Ansperrpartie 17 ），以相对于减少了滑架移动方向（H）的Ansperr-爪杆（15）的枢转点（19），以接近90°的枢转角度，以在滑架（5）。 一方面停止（25，27）固定在近90°-Sperrlage和效果（27）的Ansperr锁定杆（15），该Ansperr在Ansperrposition的溶液锁定杆（15）的螺栓（13）的装置（在一个Storenhubkette 11））快速地（从Ansperrgegenlager 7A）通过进一步的Verringers的Ansperrpartie枢轴半径）第十七枢转离开 此外，用于降低和提升和百叶窗的倾斜的驱动传递提出了在降低驱动链（37）运行在一个链轮。 在板条倾转位置，一个凸轮（105）接合在耦合元件（41）的升降链（37），所得到的位移连接的变压器（65）刚性地与链轮（35）。 扭力弹簧（87），其上用于存储倾斜的驱动构件（99）被固定在载体（97）上发送所述Uebertragerbewegung。 所述驱动器（97）作用在用于终止Storenkippbewegung，在这种情况下，扭转弹簧（87）的链轮（35）的进一步转动，由于非精确驱动机构停止，接收壳体（31）上的止动件（103）。 存储用于防止损伤，尤其是与这样的驱动传递，优选地，叶片untrste（209）可拆卸地连接到与连接到连接在所述摇臂（211）的器官（213）的倾斜驱动器。 这种具有棘轮装置（217，219）。

It is proposed a return travel lock for venetian blinds in which a movable carriage (5) a Ansperrklinke (15) is provided on the carriage (5) is mounted so that the distance (ra, rb) of a terminal Ansperrpartie (17 ) the pivot point (19) of Ansperr-ratchet lever (15) on the carriage (5) reduced with respect when approaching 90 ° swivel angle of the carriage displacement direction (H). Stops (25,27) securing one hand the Ansperr latching lever (15) in the nearly 90 ^0- barrier layer and cause (27) that derAnsperr latching lever (15) in solution of Ansperrposition by a bolt (13) at a Storenhubkette (11 ) is pivoted away by further Verringers the swing radius of Ansperrpartie) 17) quickly from Ansperrgegenlager (7a). In addition, a drive transmission for the lowering and lifting and tilting of venetian blinds is proposed in which a lowering drive chain (37) runs over a sprocket. In slat tilting position, a cam (105) engages the Hübkette (37) in a coupling element (41), the resultant displacement connects a transformer (65) rigidly with the sprocket wheel (35). A torsion spring (87) transmits the Uebertragerbewegung on a driver (97), to which is secured a drive member (99) for the Store tilting. The follower (97) acts on a stop (103) on a housing (31) for terminating the Storenkippbewegung, in which case the torsion spring (87) a further rotation of the chain wheel (35), due to non-exact drive organ arrest, receives. To prevent damage store, especially with such a drive transmission, preferably the untrste lamella (209) (211) is releasably connected to a with tilt drive members (213) connected to rocker arms. This with a ratchet device (217, 219).