A system (1) for displaying an optical image (2) by means of unmanned autonomous vehicles. Each vehicle has a display for displaying at least a part of the image (2) by way of stored or transmitted image information as well as a control unit (9). The control unit (9) is configured to control the image information and to move the vehicle using a drive unit (11) by means of stored or transmitted positon information. At least two vehicles are configured as land crafts (5), wherein the displays (3) of the land crafts (5) are oriented in parallel to a substantially horizontal image plane (6) and configured as displays (3) accessible by a human person.

The invention relates to an adjustable hoeing device (10) for removing weeds situated on a ground surface, the hoeing device (10) having a supporting frame (50), on which there is arranged at least one hoeing unit (100), which hoeing unit comprises the following:—at least one main bar (200) and at least two transverse bars (250) arranged parallel to one another, which transverse bars (250) are each mounted rotatably on the at least one main bar (200);—at least two connection bars (300), which run parallel to the at least one main bar (200) and which mechanically connect the at least two transverse bars (250) to one another;—at least two blades (500), wherein the blades (500) are arranged on the at least two transverse bars (250) at a normal distance from the main bar (200); and—at least one actuation device (400), which acts on at least two transverse bars (250) or a transverse bar (250) and the main bar (200) in order to rotate same by means of a linearly displaceable actuation arm.

A system (1) for displaying an optical image (2) by means of unmanned autonomous vehicles. Each vehicle has a display for displaying at least a part of the image (2) by way of stored or transmitted image information as well as a control unit (9). The control unit (9) is configured to control the image information and to move the vehicle using a drive unit (11) by means of stored or transmitted positon information. At least two vehicles are configured as land crafts (5), wherein the displays (3) of the land crafts (5) are oriented in parallel to a substantially horizontal image plane (6) and configured as displays (3) accessible by a human person.

The invention relates to an adjustable hoeing device (10) for removing weeds situated on a ground surface, the hoeing device (10) having a supporting frame (50), on which there is arranged at least one hoeing unit (100), which hoeing unit comprises the following:at least one main bar (200) and at least two transverse bars (250) arranged parallel to one another, which transverse bars (250) are each mounted rotatably on the at least one main bar (200);at least two connection bars (300), which run parallel to the at least one main bar (200) and which mechanically connect the at least two transverse bars (250) to one another;at least two blades (500), wherein the blades (500) are arranged on the at least two transverse bars (250) at a normal distance from the main bar (200); andat least one actuation device (400), which acts on at least two transverse bars (250) or a transverse bar (250) and the main bar (200) in order to rotate same by means of a linearly displaceable actuation arm.