Gear mechanism • having - a drive shaft, - an output shaft and - a transmission portion having a first gear element which, as part of a first gear stage, is in rotational operative connection with the drive shaft, and a second gear element, different from the first gear element, which, □ as part of a second gear stage, is in rotational operative connection with the output shaft and □ is in rotational operative connection with the first gear element, and • designed such that a drive rotation of the drive shaft in a predetermined drive rotation direction - through a first drive rotation angle leads to a rotation of the output shaft in a first output rotation direction through a first output rotation angle (α) and - subsequent through a second drive rotation angle leads to a rotation of the output shaft in a second output rotation direction, which is contrary to the first output rotation direction, through a second output rotation angle (β), • wherein the output rotation angles (α, β) are different from one another, wherein the transmission portion has a drive element, which • is in rotational operative connection with the drive shaft and • comprises a carrier, which - is spaced apart from an axis of rotation of the drive element, - is arranged for conjoint rotation relative to the drive element and - forms part of the first gear stage, characterized in that the carrier - has or forms a third gear element, which • is in rotational operative connection with the first gear element directly or by way of a first transmission element and • is arranged at a fixed distance from the first gear element, and in that for indirect rotational operative connection, the gear elements (17, 23) of the associated gear stage are designed as deflection rollers (17, 23), around which an endless transmission means is looped. • having - a drive shaft, - an output shaft and - a transmission portion having a first gear element which, as part of a first gear stage, is in rotational operative connection with the drive shaft, and a second gear element, different from the first gear element, which, □ as part of a second gear stage, is in rotational operative connection with the output shaft and □ is in rotational operative connection with the first gear element, and - a drive shaft, - an output shaft and - a transmission portion having a first gear element which, as part of a first gear stage, is in rotational operative connection with the drive shaft, and a second gear element, different from the first gear element, which, □ as part of a second gear stage, is in rotational operative connection with the output shaft and □ is in rotational operative connection with the first gear element, and a first gear element which, as part of a first gear stage, is in rotational operative connection with the drive shaft, and a second gear element, different from the first gear element, which, □ as part of a second gear stage, is in rotational operative connection with the output shaft and □ is in rotational operative connection with the first gear element, and □ as part of a second gear stage, is in rotational operative connection with the output shaft and □ is in rotational operative connection with the first gear element, and • designed such that a drive rotation of the drive shaft in a predetermined drive rotation direction - through a first drive rotation angle leads to a rotation of the output shaft in a first output rotation direction through a first output rotation angle (α) and - subsequent through a second drive rotation angle leads to a rotation of the output shaft in a second output rotation direction, which is contrary to the first output rotation direction, through a second output rotation angle (β), - through a first drive rotation angle leads to a rotation of the output shaft in a first output rotation direction through a first output rotation angle (α) and - subsequent through a second drive rotation angle leads to a rotation of the output shaft in a second output rotation direction, which is contrary to the first output rotation direction, through a second output rotation angle (β), • wherein the output rotation angles (α, β) are different from one another, wherein the transmission portion has a drive element, which • is in rotational operative connection with the drive shaft and • comprises a carrier, which - is spaced apart from an axis of rotation of the drive element, - is arranged for conjoint rotation relative to the drive element and - forms part of the first gear stage, - is spaced apart from an axis of rotation of the drive element, - is arranged for conjoint rotation relative to the drive element and - forms part of the first gear stage, in that the carrier - has or forms a third gear element, which • is in rotational operative connection with the first gear element directly or by way of a first transmission element and • is arranged at a fixed distance from the first gear element, and - has or forms a third gear element, which • is in rotational operative connection with the first gear element directly or by way of a first transmission element and • is arranged at a fixed distance from the first gear element, and • is in rotational operative connection with the first gear element directly or by way of a first transmission element and • is arranged at a fixed distance from the first gear element, and in that for indirect rotational operative connection, the gear elements (17, 23) of the associated gear stage are designed as deflection rollers (17, 23), around which an endless transmission means is looped.