Patent Application
20080288112
This application claims the priority of German Patent Document No. 10 2006 051 569.2, filed Nov. 2, 2006, the disclosure of which is expressly incorporated by reference herein.
The invention relates to a collecting cylinder of a folding unit of a printing press and method for operating the same.
Folding units of printing presses are used to form folds in printed substrates, wherein for fold formation, a web-shaped printing substrate is normally first fed through a so-called former in order to form a longitudinal fold on the web-shaped and not yet severed printing substrate. Starting from the former, the web-shaped printing substrate is transported over several draw rollers in the direction of a cutting knife cylinder, whereby copies are severed on the cutting knife cylinder by cross-cutting the web-shaped printing substrate. The copies severed from the web-shaped printing substrate at the cutting knife cylinder are held or carried over by a cylinder cooperating with the cutting knife cylinder, whereby holding devices of this cylinder are designed either as pins or as grippers for the copies being separated from the printing substrate. The cylinder cooperating with the cutting knife cylinder is consequently formed as a function of this either as a pin cylinder or a gripper cylinder. If cross-folds are supposed to be formed on the severed copies, tucker blades are integrated into the pin cylinders or gripper cylinders, which, when the cross-folds are being formed in the copies, also press them between folding jaws of a folding jaw cylinder that is cooperating with the pin cylinder or gripper cylinder. If no cross-folds are supposed to be formed in the copies, no tucker blades are integrated into the pin cylinders or gripper cylinders. The copies severed from the web-shaped printing substrate and provided with cross-folds, as the case may be, can be provided in the area of a folding table with a second longitudinal fold, which runs parallel to the longitudinal fold formed in the former.
The pin cylinder or gripper cylinder cooperating with the cutting knife cylinder can be formed as a so-called collecting cylinder in order to provide the folding apparatus with a collecting function. These types of collecting cylinders make it possible to stack several copies in the area of the collecting cylinder and thus to collect them. Special control of the holding devices and the movement of the tucker blades of the collecting cylinder is required in collect mode as well as in non-collect mode and, as the case may be, of the tucker blades of the collecting cylinder, whereby opening and closing of the holding devices in collect mode is controlled via at least one control cam and at least one cam collect of the collecting cylinder. In non-collect mode, opening and closing of the holding devices and the movement of the tucker blades is controlled exclusively by the control cams.
A collecting cylinder of a folding unit of a printing press is known from German Patent Document DE 38 10 439 C1. Thus, in addition to at least one control cam, the collecting cylinder is comprised of at least one cam collect. In order to transfer the collecting cylinder according to DE 38 10 439 C1 between collect mode and non-collect mode and back, the, or each, cam collect is drivable via a hollow pinion positioned so that it is axially displaceable on a shaft embodied as a worm, whereby the collecting cylinder can be transferred or switched between collecting mode and non-collecting mode and back by axial displacement of the hollow pinion. This type of structural design for the collecting cylinder requires a relatively large construction.
Starting herefrom, the present invention is based on the objective of creating a new type of collecting cylinder of a folding unit of a printing press.
According to the invention, the cylinder body of the collecting cylinder along with the, or each, control cam is positioned via a first bearing body on a frame, wherein the, or each, cam collect is positioned via a second bearing body coxially to the first bearing body on an axis of the collecting cylinder, wherein a speed difference between the, or each, cam collect and the collecting cylinder can be made available via transmission gearing having several gears and a shiftable unique coupling, and wherein, to switch the collecting cylinder between non-collect mode and collect mode and back with an opened unique coupling, an exclusive relative rotation between the, or each, cam collect and the collecting cylinder around a specific angle can be realized in such a way that the unique coupling is also rotatable around this angle.
In the case of the collecting cylinder in accordance with the invention, the transfer between non-collect mode and collect mode and back takes place exclusively via a relative movement between the, or each, cam collect and the collecting cylinder.
In contrast to the prior art according to DE 38 10 439 C1, when transferring the collecting cylinder between non-collect mode and collect mode and back, there is no axial movement of the components of the cylinder, so that the inventive collecting cylinder has a smaller structural shape as compared with the prior art. In addition, the inventive design of a collecting cylinder is structurally simpler and therefore more cost-effective.
Preferred developments of the invention are yielded from the following description. Without being limited hereto, exemplary embodiments of the invention are explained in greater detail on the basis of the drawings.
The present invention will be described in greater detail in the following making reference to
When the collecting cylinder is in collect mode, these control cams 4 cooperate with cam collects 6, which are allocated to a second bearing body 7. The second bearing body 7 extends coxially towards the first bearing body 2 and is rotatably mounted via bearings 21 on an axis 23 of the collecting cylinder. In addition, the second bearing body 7 is rotatably mounted via bearings 22 with respect to the first bearing body 2, wherein, according to
As already stated, the collecting cylinder's holding devices that are fastened to the shafts 5 and allocated to the cylinder body 1 are actuated in non-collect mode exclusively by the control cams 4, and in collect mode by both the control cams 4 and the cam collects 6, whereby then a defined differential speed is required between the collecting cylinder and the cam collects 6. This differential speed is made available via transmission gearing having several gears 8, 9, 10 and 11. According to
According to
Then, when the power transmission between the two gears 10 and 11 is made available via the unique coupling 13, both gears 10 and 11 rotate at the same speed along with the shaft 12. Then, on the other hand, when the unique coupling 13 interrupts the power transmission between the gears 10 and 11, the gear 10 can be rotated independent of gear 11 as well as the shaft 12 within the sense of an idler gear.
To switch the collecting cylinder depicted in
As already stated, when the unique coupling 13 is opened, the coupling interrupts the power transmission between the gears 10 and 11 allocated to the shaft 12 so that, when a main drive of the folding apparatus is at a standstill, a separate drive 17 can rotate the cam collects 6 with respect to the collecting cylinder. To this end, the separate drive 17 drives, via a gear 15 positioned on another shaft 14 running axially parallel to the axis 23 of the collecting cylinder as well as via a locked freewheeling clutch 16 allocated to the same shaft 14, into the gear 8 of the first cylinder pair, thereby rotating the second bearing body 7, which is firmly connected to the gear 8. Since, as already mentioned, the cam collects 6 act on this second bearing body 7, the cam collects 6 are hereby rotated relative to the collecting cylinder. Since the gear 8 is engaged with gear 11 and the transmission ratio between the gears 8 and 11 is 1 to 1, during the rotation of the cam collects 6 around a defined angle, the unique coupling 13 is also rotated around this defined angle. The gears 9 and 10, on the other hand, are at a standstill when the unique coupling is opened. The gear 15 is connected to the freewheeling clutch 16 so that it is torque-resistant. The drive 17 is connected to the shaft 14 so that it is torque-resistant.
The unique coupling 13 has several switch points at its disposal, which are respectively offset from one another by a defined angle. Closing the unique coupling 13 is then only possible if corresponding coupling discs of the unique coupling 13 were rotated towards one another around the respective angle.
In the case of the collecting cylinder 1 in accordance with the invention, switching between a collect run and a non-collect run and back, is thus accomplished exclusively via a relative rotation between the cam collects 6 and the collecting cylinder. No axial movement of components of the collecting cylinder is required during this switch. The coaxial positioning of the bearing body 7 supporting the cam collects 6 and of the bearing body 2 supporting the control cams 4 results in a splitting of the bearing speeds, whereby the bearing 21 between the axis 23 of the collecting cylinder and the bearing body 7 is subject to the differential speed between the speed of the cam collects 6 and the collecting cylinder, and whereby the bearing 22 between the two bearing bodies 2, 7 is subject to the speed of the cam collects 6.
In the exemplary embodiment shown in
In the exemplary embodiment in
In fact, in the exemplary embodiment in
In order to hereby guarantee an equal angle rotation of the cam collect 6 and unique coupling 13, in the exemplary embodiment in
After the collecting cylinder has been switched between collect mode and non-collect mode or back between non-collect mode and collect mode, the unique coupling 13 is closed and the brake 20 opens. The advantage of the exemplary embodiment in
The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2006 051 569.2 | Nov 2006 | DE | national |
