Floor cleaning machine with a machine frame , with a chassis , which is provided on the machine frame , for moving the floor cleaning machine along a direction of travel over a floor surface to be cleaned, with a cleaning device which is held movably on the machine frame , wherein a cleaning element and a container for sweepings , which has a base , are provided on the cleaning device , wherein the cleaning device can be adjusted in relation to the machine frame between a lowered position and an elevated position, wherein, in the lowered position, the cleaning element is arranged relative to the floor surface to be cleaned such that said cleaning element can clean the latter, and wherein, in the elevated position, the cleaning device is spaced apart from the floor surface to be cleaned, characterized in that the floor cleaning machine has a probe element which has a free end which extends into the container for sweepings , wherein the probe element is arranged in such a manner that the distance of the free end of the probe element from the base of the container for sweepings is increased when the cleaning device is adjusted from the elevated position into the lowered position, wherein the probe element can execute a movement relative to the machine frame , during which movement the free end of said probe element executes a movement in a direction which points away from the base of the container for sweepings , and with means for detecting the movement of the probe element relative to the machine frame , wherein the means are configured to emit a signal when a movement of the probe element is detected. with a chassis , which is provided on the machine frame , for moving the floor cleaning machine along a direction of travel over a floor surface to be cleaned, with a cleaning device which is held movably on the machine frame , wherein a cleaning element and a container for sweepings , which has a base , are provided on the cleaning device , wherein the cleaning device can be adjusted in relation to the machine frame between a lowered position and an elevated position, wherein, in the lowered position, the cleaning element is arranged relative to the floor surface to be cleaned such that said cleaning element can clean the latter, and wherein, in the elevated position, the cleaning device is spaced apart from the floor surface to be cleaned, characterized in that the floor cleaning machine has a probe element which has a free end which extends into the container for sweepings , wherein the probe element is arranged in such a manner that the distance of the free end of the probe element from the base of the container for sweepings is increased when the cleaning device is adjusted from the elevated position into the lowered position, wherein the probe element can execute a movement relative to the machine frame , during which movement the free end of said probe element executes a movement in a direction which points away from the base of the container for sweepings , and with means for detecting the movement of the probe element relative to the machine frame , wherein the means are configured to emit a signal when a movement of the probe element is detected. <EOS>