Device for backing book blocks
A device for backing rounded book blocks ( 2 ) clamped near the spine, by a pressing beam ( 9 ) and a slide ( 7 ) that accommodates the pressing beam ( 9 ) and can be alternately displaced along arc-shaped races ( 6 ) in a swinging fashion by driving means ( 17 ) in a height-adjustable supporting bearing ( 5 ) that is laterally supported against the effect of a spring element ( 29 ). Members are provided for controlling ( 21, 22, 32, 33 ) the lateral position of the supporting bearing ( 5 ) and for lowering and raising ( 10, 11, 12 ) the pressing beam into the starting position for its return stroke. An eccentric starting position is realized during the lowering of the pressing beam ( 9 ) on the spine ( 2 a ), in the form of a swinging position of the slide ( 7 ) that is offset toward the opposite side of the spine center ( 2 b ) referred to the respective side to be backed thereafter.
1. A device for the mechanized backing of rounded book blocks ( 2 ) that are clamped adjacent the book block spine, comprising:
a pressing beam ( 9 ) having an effective area ( 9 a ) that acts upon the block spine ( 2 a ) with a pressing force;
a slide ( 7 ) that accommodates the pressing beam ( 9 ) and can be alternately displaced along arc-shaped races ( 6 ) in a swinging fashion by driving means ( 17 ), toward one side and the other side of the block spine ( 2 a ) relative to a spine center ( 2 b ), in a height-adjustable supporting bearing ( 5 ) that is laterally supported against the effect of a spring element ( 29 );
means ( 21 , 22 , 32 , 33 ) for controlling the lateral position of the supporting bearing ( 5 );
means ( 10 , 11 , 12 ) for lowering the pressing beam ( 9 ) onto the block spine ( 2 a ) in a pressing stroke and for raising the pressing beam to a starting position for a return stroke;
wherein said lowering produces an eccentric starting position of the pressing beam ( 9 ) on the block spine ( 2 a ) in the form of a swinging position of the slide ( 7 ) that is offset toward the opposite side of the block spine center ( 2 b ) relative to the respective side to be backed thereafter.
2. The device according to claim 1 , wherein the supporting bearing ( 5 ) is laterally offset relative to the block spine center ( 2 b ) toward the same side in the eccentric starting position such that the pressing beam ( 9 ) is placed on the block spine with its center of swinging motion ( 18 ) that approximately lies in the effective area ( 9 a ).
3. The device according to claim 2 , wherein the supporting bearing ( 5 ) is returned into the cushioned center position ( 32 a ) while the pressing beam ( 9 ) swings up to the block spine center ( 2 b ) in order to back and turn over the sheets on the actual block spine side during the continued swinging motion of the pressing beam ( 9 ).
4. The device according to claim 3 , wherein the position control for the supporting bearing ( 9 ) is realized by displacing the position of the supporting point for the spring element ( 22 , 29 ) that supports the supporting bearing ( 5 ).
5. The device according to claim 3 , including an adjustable spring force ( 31 ) of the spring element ( 22 , 29 ) that supports the supporting bearing ( 5 ).
6. The device according to claim 2 , wherein the position control for the supporting bearing ( 9 ) is realized by displacing the position of the supporting point for the spring element ( 22 , 29 ) that supports the supporting bearing ( 5 ).
7. The device according to claim 6 , including an adjustable spring force ( 31 ) of the spring element ( 22 , 29 ) that supports the supporting bearing ( 5 ).
8. The device according to claim 2 including an adjustable spring force ( 31 ) of the spring element ( 22 , 29 ) that supports the supporting bearing ( 5 ).
9. The device according to claim 1 , including an adjustable spring force ( 31 ) of the spring element ( 22 , 29 ) that supports the supporting bearing ( 5 ).