Back to results
US 6,182,959 B2Granted
Method and devices for conveyance of sheets
AssigneeDe La Rue Giori S.A.
InventorsJohann Emil Eitel, Johannes Georg Schaede
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for conveyance of sheets, in which said sheets are advanced or slowed down in such a manner that a distance is altered. A value of said change in distance can be preselected.
Claims10
Method for conveying sheets (23;
- 25) in a sheet-processing machine, having the following steps;
- the sheets (23;
- 25) are accelerated in such a way that successive sheets (23;
- 25) are at a first spacing (a1),
- the sheets (23;
- 25) are then decelerated in such a manner that the spacing (a1;
- a2) between successive sheets (23;
- 25) is reduced from the first spacing (al) to a second spacing (a2),
- at least one of said first or second spacings (a1;
- a2) being preselectable, and
- the second spacing (a2) between successive sheets (23;
- 25) is increased, following a processing operation carried out on the sheets (23;25), to a third spacing (a3).
9 more elements
Device for conveying sheets (23;25) in a sheet-processing machine, having a machine speed, by means of a suction drum (18;
- 36) having a circumferential speed, wherein the circumferential speed (um;u18′;V31) of the suction drum (18;
- 36) can be adjusted, independently of said machine speed (um), by means of a rotational-angle-controlled electric motor (19;
- 47), wherein the suction drum (18) cooperates with a processing cylinder (14), and wherein the processing cylinder (14) has a dedicated speed-controllable and/or position-controllable electric motor (28).
Device for conveying sheets (23;25) in a sheet-processing machine having a machine speed (um), wherein in order to change a spacing (a1;
- a2;
- a3) between an end of a leading sheet (23) and a beginning of a trailing sheet (25), at least one conveyor device (18;
- 36) with at least one holding system for holding the sheets is provided, and wherein this conveyor device (18;
- 36) can be driven by means of a drive (19;
- 47) in such a manner that the conveyor device (18;
- 36) can be brought from a first circumferential speed (um or v31) to a second circumferential speed (u18′ or um) and wherein a ratio of at least one of said circumferential speed (u18′;
- v31;
- um) can be adjusted with respect to said machine speed (um), wherein the conveyor device (18;
- 36) is arranged so as to interact directly or indirectly with a processing cylinder (14).
6 more elements
Device for conveying sheets (23;
- 25) in a sheet-processing machine having a machine speed, wherein in order to change a spacing (a1;
- a2;
- a3) between an end of a leading sheet (23) and a beginning of a trailing sheet (25), at least one conveyor device (18;
- 36) which is provided with at least one holding system for holding the sheets is provided, wherein this conveyor device (18;
- 36) can be driven by means of a drive (19;
- 47) in such a manner that the conveyor device (18;
- 36) can be brought from a first circumferential speed (um or v31) to a second circumferential speed (u18′ or um) and wherein a ratio of at least one circumferential speed (u18′;
- v31;
- um) with respect to said machine speed (um) can be adjusted, wherein a first conveyor device (18), which reduces the spacing (a2) between two sheets (23;25), is provided, wherein a processing cylinder (14), which is connected downstream of the first conveyor device (18), is provided, and wherein a second conveyor device (36), which increases the spacing (a3) between two sheets (23;
- 25), is connected downstream of the processing cylinder (14).
7 more elements
Dependencies are inferred from the claim text.