| 摘要 |
In a system for setting the vertical position of the rounding bar in a book block rounding and backing machine which possesses a support bearing unit, within which the rounding bar that acts on the spine of the book block reciprocates, the support-bearing unit is adjusted in the vertical direction, in side frames, by means of adjusting spindles, so as to set its vertical position, and is immobilized in the side frames by means of a clamping arrangement. The support bearing unit 7 is carried in a frame 4 and can, with the rounding bar 3, be deposited, by their own dead weight, onto the spine of a book block 1. The support bearing unit 7 is supported on intermediate supporting elements 24, 24a so that it cannot descent below them, while being free to slide upwards. The intermediate supporting elements 24, 24a are lowered by means of adjusting spindles 22 which can be motor driven. Once the rounding bar 3 has been deposited onto the spine of the book block 1, the intermediate supporting elements 24, 24a can be lowered through a further, defined travel distance, into a datum end position. Furthermore, a switch device 31, 32 is provided, which enables the rotation of the adjusting spindles 22 to be switched off, once the datum end position has been reached, and which enables a ram-type actuator 37 to be activated so as to operate a clamping arrangement 33-36 for automatically immobilizing the support-bearing unit 7 in the side frame 4.
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