Material or article handling – Apparatus for moving intersupporting articles into – within,... – Stack forming apparatus
Reexamination Certificate
1997-10-15
2001-05-01
Krizek, Janice L. (Department: 3652)
Material or article handling
Apparatus for moving intersupporting articles into, within,...
Stack forming apparatus
C271S158000, C414S924000
Reexamination Certificate
active
06224320
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for guiding vertically movable sheet pile carriers, particularly in deliveries of a sheet processing machine.
The published German Patent Document DE 40 29 919 C1 relates to a device for stacking sheets. Heretofore known are devices for stacking sheets, such as paper or cardboard, especially, on a pallet, those devices having a liftable and lowerable deposition platform on which the pallet rests during stacking, and an auxiliary stacking platform, which can be moved into the region of the deposition platform, for temporarily storing the sheets during a change of pallet. In the embodiment of the device disclosed in the aforementioned published German Patent Document DE 40 29 919 C1, the height of the pallet is determined by a vertically movable scanner element that can be placed on the surface of the pallet and moved over the entire surface thereof. To that end, during the movement of the scanning element over the pallet surface, the maximum upward deflection is measured. The thus-determined pallet height ensures the transfer without difficulty of a temporary sheet pile from the auxiliary stacking platform onto a new pallet.
The auxiliary stacking platform, which can be lowered into stands or pedestals on the entry side, is supported in carriagelike elements, while the deposition platform is movable by being suspended from chains. The deposition platform is held in a freely suspended manner on the chain elements.
The published German Patent Document DE 39 22 803 A1 relates to an automatic sheet pile loading device for a sheet feeder device. The embodiment disclosed therein relates to an automatically operating sheet pile loading device for a paper sheet feeder device having a main lifting device for receiving thereon a sheet pile to be transported. The main lifting device is moved upwardly in stages in order to bring the uppermost sheet of the pile to a predetermined height position with respect to a sheet separator, which is disposed above the sheet pile and takes the sheets individually from the pile. When the sheet pile has been used up, for the most part, horizontally disposed parallel skewers are inserted beneath the stack from both transverse sides of the pile in order to lift the pile load and to lower the main lifting apparatus to accommodate a new sheet pile. The insertion of the skewers in a transverse direction of the pile is advantageous inasmuch as the middle portion of the sheets in the pile can be kept at a constant height in the transport direction of the sheets, regardless of the downward sagging of the skewers, thus making it unnecessary to adjust the position of the sheet separator.
In the version disclosed in the last-mentioned published German patent document, the auxiliary lifting apparatuses are secured to chainlike lifting components and are introduced from the side.
The published German Patent Document DE 43 44 361 A1 relates to a device for forming individual sheet piles. In a device suitable for non-stop operation of, for example, a delivery of a sheet-fed rotary printing press, in which sheets of a sheet stream are combined into individual piles, the piles, respectively, rest on a pile support having a pile bearing surface which is interrupted by grooves. Auxiliary sheet piles are carried by grid bars combined into a rake until the auxiliary sheet piles are transferred to the pile support. To avoid impairments of the pile due to the weight thereof, a catch plate is provided, in accordance with the invention, which catches, from below, the auxiliary pile deposited on the grid bars which are located in a catching position.
As can be learned from the last-mentioned German Patent Document DE 43 44 361 A1, both the pile support and the frame for the rake are suspended from chains. In such pile supports carried in a freely suspended manner in chains, and especially in auxiliary pile supports, factors such as thrusts or shocks or the like exerted from outside can negatively impact the insertion of the auxiliary pile support and the insertion path to be traversed thereby, so that, at the least, the pile changing operation may be accompanied by imprecision.
SUMMARY OF THE INVENTION
Based on the prior art discussed above, it is accordingly an object of the invention to provide an apparatus for guiding vertically movable sheet pile carriers, more particularly, in an automatically operated non-stop device, which guides the main and auxiliary sheet piles so that vibration does not occur, and guides the auxiliary sheet piles so that axial forces arising as the auxiliary pile carriers are inserted and removed can be absorbed.
With the foregoing and other objects in view, there is provided, in accordance with the invention, a device for guiding vertically movable sheet pile carriers for receiving thereon sheets of a substantially horizontally oriented, continuous stream of sheets including a pile lifter having a main pile support and an auxiliary pile support displaceable back and forth between a readiness position located outside the sheet stream, and a catching position located inside the sheet stream and, when the main pile is being changed, temporarily carrying, in the form of an auxiliary pile, some of the sheets coming from the sheet stream, including an auxiliary pile frame embracing the displaceable auxiliary pile support and being guidable, jointly with guiding devices of the auxiliary pile support, in vertically extending guide elements.
In accordance with another feature of the invention, the device for guiding vertically movable sheet pile carriers includes sliding blocks mountable from the outside and being fastenable to the auxiliary pile frame.
In accordance with a further feature of the invention, the sliding blocks are alignable by at least one adjusting device on the auxiliary pile frame.
In accordance with an added feature of the invention, the device for guiding vertically movable sheet pile carriers includes stop faces formed on the auxiliary pile frame in a region wherein the sliding blocks are mountable thereon.
In accordance with an additional feature of the invention, the device for guiding vertically movable sheet pile carriers includes guiding devices associated with the main pile support and being embodied as ball-headed pins deflectable in two planes.
In accordance with yet another feature of the invention, the guiding devices of the main pile support are relatively movable in sliding blocks.
In accordance with yet a further feature of the invention, the guiding devices of the main pile support are connected to the main pile support via adjusting elements.
In accordance with a concomitant feature of the invention, the main pile support connected via the adjusting elements to the guiding devices of the main pile support is adjustable relative to the adjusting elements.
The embodiment according to the invention advantageously permits the interception of the reaction forces arising as the auxiliary pile support is inserted or removed, and thereby the avoidance of an undesired relative motion between the auxiliary pile frame and the main pile support in the sheet feeding plane. As a result, greater edge accuracy when combining the auxiliary pile and the main pile is attainable, which means less post-processing work for the pressman. The joint vertical guidance of the auxiliary pile frame and the main pile support lends the sheet delivery, typically equipped with chainlike lifting devices, greater stability against external factors and disruptions.
In an advantageous further realization of the concept upon which the invention is based, sliding blocks may be secured from the outside to the auxiliary stack frame. The sliding blocks can be introduced from outside through openings made in the vertically extending guide elements, and screwed to the auxiliary pile frame, for example. Fine adjustment of the auxiliary pile frame with respect to the vertically extending guide elements can be effected by adjusting devices, which are embodied herein, for example, as
Greenberg Laurence A.
Heidelberger Druckmaschinen Aktiengesellschaft
Krizek Janice L.
Lerner Herbert L.
Stemer Werner H.
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