Abstract: Deflecting device (3) for a chain of tenter clips (1) with running rollers (2) for the transport of a moving material web, with a sprocket (4) as well as with a guide rail (5) with at least two tracks (6.1, 6.2) for the running rollers (2) of the tenter clips (1). The two tracks (6.1, 6.2) are respectively arranged on two mutually oppositely facing sides of the guide rail (5) parallel to the rotation axis of the sprocket (4). The guide rail (5) comprises at least one curved section (5.2) for deflecting the chain. In the area of the curved section (5.2) of the guide rail (5), connecting elements (8, 9, 10) are present, by which the guide rail (5) is connected with the deflecting device (3). Several connecting elements (8, 9, 10) are embodied in such a manner so that at least a part of the curved section (5.2) of the guide rail (5) is radially slidable with respect to the sprocket (4).

Abstract: An apparatus (2) with a chain (1) that is arranged endlessly circulateable in the apparatus (2) includes a measuring apparatus (3) for measuring the stretching or elongation of the chain (1), with a first signal pick-up (4) and with a second signal pick-up (5), which are arranged at a spacing distance (D) relative to one another, which extends in the running direction over several chain links (6) of the chain (1). A first element for signal generation (7) is arranged on a first chain link (6.1) in such a manner so that with a circulating chain (1) a signal is produced upon running past the first signal pick-up (4). Several further elements for signal generation (8) are arranged on a second chain link (6.2) in such a manner so that with a circulating chain (1) a further signal is generated with each one of these further elements (8) upon running past the second signal pick-up (5).

Abstract: An apparatus (2) with a chain (1) that is arranged endlessly circulateable in the apparatus (2) includes a measuring apparatus (3) for measuring the stretching or elongation of the chain (1), with a first signal pick-up (4) and with a second signal pick-up (5), which are arranged at a spacing distance (D) relative to one another, which extends in the running direction over several chain links (6) of the chain (1). A first element for signal generation (7) is arranged on a first chain link (6.1) in such a manner so that with a circulating chain (1) a signal is produced upon running past the first signal pick-up (4). Several further elements for signal generation (8) are arranged on a second chain link (6.2) in such a manner so that with a circulating chain (1) a further signal is generated with each one of these further elements (8) upon running past the second signal pick-up (5).

Abstract: A method and apparatus continuously monitor the functional condition of the successive bearings of the tenter clips or claws of a tenter chain as the bearings roll along a contact surface of the endless guide rail of a tentering machine. A sensing arrangement is integrated into the guide rail in the area of the contact surface thereof. The sensing arrangement senses a physical value indicative of the presence and condition of the respective bearing passing by the sensing arrangement. The sensing arrangement may include a pressurized air outlet and an adjacent pressure measuring channel connected to a pressure sensor to sense the back pressure created by a passing bearing. The sensing arrangement may alternatively include an electromagnetic eddy current sensor, or an optoelectronic light beam sensor.

Abstract: A method and apparatus continuously monitor the functional condition of the successive bearings of the tenter clips or claws of a tenter chain as the bearings roll along a contact surface of the endless guide rail of a tentering machine. A sensing arrangement is integrated into the guide rail in the area of the contact surface thereof. The sensing arrangement senses a physical value indicative of the presence and condition of the respective bearing passing by the sensing arrangement. The sensing arrangement may include a pressurized air outlet and an adjacent pressure measuring channel connected to a pressure sensor to sense the back pressure created by a passing bearing. The sensing arrangement may alternatively include an electromagnetic eddy current sensor, or an optoelectronic light beam sensor.