Sheet feeding or delivering – Feeding – Pack holders
Reexamination Certificate
2002-01-22
2004-06-08
Walsh, Donald P. (Department: 3653)
Sheet feeding or delivering
Feeding
Pack holders
C271S171000
Reexamination Certificate
active
06746012
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a method and a device for controlling elements which guide sheet material, such as are used, for example, in the feeder region of rotary printing machines for processing sheet material.
The published German Patent Document DE 298 01 061 U1 discloses the sensing of a sheet-pile edge for a sheet feeder. On a sheet feeder of a sheet processing machine, a sprung sensing roller is provided on a lateral edge of a sheet pile, and also a switch for registering the position of the sensing roller. The sensing roller is arranged on a lever that is pivotably connected to a holder which is guided format-adjustably in the sheet feeder. The lever is, in turn, braced or stressed by a leaf spring with respect to the holder, in a direction towards a zero position. The lever is pivotable to both sides from the zero position counter to the force of the leaf spring, it being possible for the pivoting movement of the lever in relation to adjustable tolerance limits to be registered by a switch. The leaf spring is firmly clamped into the holder and fixed laterally to the lever, however, it is fastened so as to be freely guided in the longitudinal direction.
The published European Patent Document EP 0 894 755 A1 discloses an aligning device for an automatic pile changer. Provided on a sheet-fed offset printing machine is a feeder having a non-stop device, also with a vertically adjustable residual pile carrier holding a residual pile, and also a pile support plate which is movable vertically and horizontally and holds a main sheet pile. Also provided are sensor devices, which are connected via an evaluation and control circuit to a drive for effecting a horizontal alignment of the pile support plate. What is sought to be achieved with such an aligning device is an exact alignment of the main pile with respect to the residual pile, in a structurally simple manner. For this purpose, the sensor devices are formed by a distance measuring system which is movable vertically via a lifting device, and by which, in a first position, the distance to the side surface of the residual pile and, in a second position located underneath, the distance to the side surface of the main pile can be registered and, by the evaluation and control circuit, the pile support plate can be moved via the drive in order that the two distance measured values are in agreement.
The published German Patent Document DE 198 16 181 A1 discloses a device for supplying sheets from a pile to a machine having a printing technology base. With this device, with little outlay of material and costs, lateral pile alignment of sheet material with increased accuracy and reliability is to be provided. A device for feeding sheet material includes a device for separating or singling the respective topmost sheet from the sheet pile, and also a device which conveys the separated sheet to the machine having a printing technology base. Also provided is a positioning device for the sheet pile, which permits controlled movement of the pile transversely with respect to the conveying direction, at least one feeler or detecting element being disposed in the region of a pile side edge that is provided, and also a feeler that reproduces the course of the pile side edge that is provided.
FIG. 1
diagrammatically shows a feeder for a sheet-processing machine according to the prior art, which has a sheet pile board holding a sheet pile, the pile board being movable in accordance with a sensor mechanism fitted to a first guide element.
At the feeder
1
of a machine for processing sheet material
5
, such as a rotary printing machine, for example, the sheet material
5
is drawn off the upper side of a sheet pile and guided in a conveying direction represented by the arrow
2
, in a conveying plane
3
corresponding to the plane of the drawing, to a front lay
9
aligning the leading edge of the sheet material
5
. Lateral alignment of the sheet material
5
, which may be formed, for example, of paper with lightweight or heavier-weight grammages and cardboard or pasteboard, is performed, in this regard, at a pulling device
10
provided at the operating side
8
. The pulling device
10
, which is arranged in a fixed location in relation to the conveying plane
3
of the sheet material
5
, can be configured, for example, as a pulling lay, a pulling rail or a pulling roller, and imparts a lateral pulling travel Z, also identified by reference numeral
11
, to the sheet material
5
.
Stop surfaces
14
and
18
, respectively, are provided on both sides, namely the drive side
7
and the operating side
8
, of the sheet pile containing the sheet material
5
. Each of the stop surfaces
14
and
18
, respectively, includes a sensor element
13
and
17
. In the case of the improvement in the feeder according to
FIG. 1
, which is disclosed in the prior art, the stop surface
18
provided on the operating side
8
is constructed in a fixed location. The pile gap F, also identified by reference numeral
12
, or the distance or spacing between the side edge of the sheet material
5
and the stop surface
18
, is fixedly prescribed and determines the position wherein the stop surface
18
is disposed. The position of the locally fixed stop surface
18
is determined from the difference between the pulling travel Z and the pile gap or distance F.
On the drive side
7
, a dedicated drive, for example, in the shape of an electric motor, is assigned to the positionable stop surface
14
. It is therefore possible for the controllable stop surface
14
to be controlled to a pile edge distance F,
12
in accordance with the course of the sheet pile edge.
A surface
15
, whereon a pile of the sheet material
5
is held, likewise includes a dedicated drive with which the surface that holds the sheet pile can be moved to both sides in the direction of the travel movement represented by the double-headed arrow
16
,
50
that the pile board can be kept between the locally fixed stop surface
18
and the positionable stop
14
while maintaining a distance F that is kept constant to the greatest possible extent on both sides.
In sheet-processing rotary printing machines, sheets located on a paper sheet pile are separated by suitable systems and fed to the printing unit. The feeding is carried out over a given laterally offset amount, i.e., the pulling travel, which, for the purpose of lateral alignment of the sheet material before it runs into the first printing unit at front lays on the feed table, is impressed onto the individual sheet based upon the individual position of the sheet. The pulling travel should remain as constant as possible. In the case of laterally wavy or stepped sheet piles, this leads to lateral tracking by the personnel operating the sheet-processing machine, i.e., the pressmen, or lateral tracking by automation in the form, for example, of automatic pile centering. In this regard, the distance of the upper pile region from the guide element on the pulling side, i.e., the operating side, is kept constant. The guide elements are used for lateral guidance of the sheets previously loosened by air. In order to keep the pulling travel as constant as possible, the guide elements should be as close as possible to the pile. If the sheet width fluctuates, due to the sheet cutting tolerance, it is possible for jamming or an excessively large guide spacing to occur on the non-pulling side. For given printing material grammages, this can in turn lead to stoppages or to lateral scatter of the sheets in relation to the pulling travel. Furthermore, in the case of manual adjustment of the guide element on the non-pulling side, for example, when the automatic system is deactivated, the guide element can be moved into the pile. In this regard, the pile and the guide element can be damaged.
SUMMARY OF THE INVENTION
In view of the foregoing corrective techniques heretofore known in the prior art, and also the indicated technical problem, it is an object of the invention to adapt the position of the guide ele
Heidelberger Druckmaschinen AG
Mayback Gregory L.
Schlak Daniel K
Walsh Donald P.
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