Printing press with cylinder sensor

A printing press comprising:

• at least one exchangeable cylinder rotatably supported in a machine frame,
• a movable bearing member forming part of a bearing for supporting a first exchangeable cylinder of the at least one exchangeable cylinder,
• a signalling device mounted on one cylinder of said at least one exchangeable cylinder of the printing press, and
• at least one sensor head adapted to receive signals from the signalling device, the at least one sensor head being mounted on the movable bearing member and being arranged to receive the signals from the signalling device at least when the bearing member is in a predetermined position,
• wherein the bearing member carries two sensor heads which can alternatingly be tilted into an active position.

A printing press comprising:

• at least one exchangeable cylinder rotatably supported in a machine frame,
• a movable bearing member forming part of a bearing for supporting a first exchangeable cylinder of the at least one exchangeable cylinder,
• a signalling device mounted on one cylinder of said at least one exchangeable cylinder of the printing press, and
• at least one sensor head adapted to receive signals from the signalling device, the at least one sensor head being mounted on the movable bearing member and being arranged to receive the signals from the signalling device at least when the bearing member is in a predetermined position,
• wherein:
• the signalling device includes a position mark,
• one said associated sensor head includes a position sensor, and
• one of:
• the movable bearing member and
• an associated component part
• has mounted thereon a position measuring device for measuring a position of the bearing member relative to said component part, and
• wherein the bearing member is rotatable, and the position measuring device is arranged for detecting an angular position of the bearing member relative to the component part.