Drive unit for a sliding assembly, in particular a sliding door

A drive unit for a sliding door comprising:

• a carriage, which is formed for linearly mounting in relation to a sub-structure of the sliding door,
• a deflection roller rotatable around a roller axis, at the carriage for deflecting a drive belt of the sliding door,
• and a tensioning device, comprising:
• a shaft with male thread rotatable around a shaft axis,
• a first shaft reception with female thread for receiving the male thread of the shaft,
• a second shaft reception for linearly receiving the shaft, the shaft extending through the second shaft reception wherein the second shaft reception is configured to hold the shaft,
• and a compression spring between the second shaft reception and a spring abutment at the shaft,
• wherein the shaft is disposed for tensioning the drive belt by increasing the distance between the first shaft reception and the second shaft reception,
• further comprising a carrier for stationarily mounting to the sub-structure, wherein the carriage is linearly supported at the carrier, and wherein one of the two shaft receptions is stationarily disposed at the carrier, comprising at least one affixing element for immobile affixing the carriage to the carrier, wherein the first shaft reception is fixed to a carrier bottom and the second shaft reception is fixed to the carriage;
• and
• a display device for displaying the tension of the drive belt with a first display element on the shaft and a second display element, which is disposed stationarily with regard to the second shaft reception, wherein the second display element comprises a frame with a window, through which the first display element is capable of being seen through the window.