Tensioning piece of a conveyor chain for a film web

A tensioning element (1) having:

• a bearing bracket (2) with a first and second surface (6, 25),
• a clamping means (3), which is mounted displaceably in the bearing bracket (2) and which comprises a clamping piece (4) interacting with the first surface (6) and a foot (5), wherein the clamping piece (4) and the foot (5) are connected together by a middle piece (7),
• a spring (8), which interacts with the second surface (25),
• Characterised in that
• the middle piece (7) has a smaller diameter than the foot (5) and
• the spring (8) interacts, apart from with the second surface (25), with the foot (5).