Advancing material of indeterminate length – With means to temporarily deform material laterally
Reexamination Certificate
2000-04-21
2002-03-12
Mansen, Michael R. (Department: 3653)
Advancing material of indeterminate length
With means to temporarily deform material laterally
C226S031000, C226S180000, C226S187000, C242S615100, C242S615300
Reexamination Certificate
active
06354478
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an apparatus for guiding an endless paper web and in particular to an apparatus for guiding an endless paper web without making use of perforated edges or transport pins to a subsequent paper processing means.
BACKGROUND OF THE INVENTION AND DESCRIPTION OF THE PRIOR ART
The present invention relates to an apparatus for guiding an endless paper web and in particular to an apparatus for guiding an endless paper web without making use of perforated edges or transport pins to a subsequent paper processing means.
In the prior art various apparatuses for guiding an endless paper web e.g. to a paper processing system are known. For achieving the straightest possible movement of the paper e.g. through a paper cutter or a printer, one method of implementing a paper guide means is the use of so-called traction means in the case of which transport holes punched into the paper web on both sides thereof are engaged by pins for transporting the paper.
One disadvantage of this paper guide means is to be seen in the fact that, for providing the perforated edges, the paper web must first be taken to a ready-to-use manufacturing apparatus by the producer before it can be supplied to the final consumer. In addition, the transport holes are frequently cut off from the lateral edges of the paper web for optical or other reasons in the means used for further processing, and this entails, in turn, an unnecessary consumption of paper and unnecessary waste paper and it necessitates an edge cutting means.
In the case of a further apparatus for guiding an endless paper web known on the prior art, the straight movement of the paper web is achieved by means of web-edge control making use of adjustable guide and transport rolls.
A paper guide means of this kind requires a very complicated technical design with adjustable guide and transport rolls; in addition, it is very complicated to carry out the adjustments for guiding a paper web of the respective type of paper.
In the prior art, an apparatus is additionally known in the case of which a paper guide means, which is described in detail in FIG.
6
. Comprises a trough structure
100
with a concave or convex surface
102
and shoulders
104
. The shoulders
104
are provided for engagement with opposed edges of a paper web
106
. The direct distance
108
between the shoulders
104
on both sides of the trough structure
100
is smaller than a width
110
of the paper web
106
when flat. The trough structure
100
has the effect that the paper web
106
is deformed with regard to its width
110
so that the distance
108
between edges along the longitudinal sides of the paper web
106
in the trough structure
100
is smaller than the width
110
between the edges of the trough structure. When the apparatus is in use, the paper web
106
moves from an entrance end
112
to an exit end
114
through the trough structure
100
. The shoulders
104
engage the paper edged so that the paper is help in the trough structure and guided along a straight line.
The paper web
106
moves through the trough structure
100
to a flat surface
116
. This flat surface
116
extends from the concave surface
102
(support structure) of the exit end
114
of the trough structure
100
to the straightening plows
118
. The flat surface
116
is additionally provided with a central opening
120
. The opening
120
has arranged therein the driving roll
122
. The driving roll
122
is arranged in the opening
120
in a vertical plane in such a way that an outer rubber surface
124
of the driving roll
122
is located slightly above the flat surface
116
. The outer layer
124
of the driving roll
122
engages the lower surface of the paper web
106
as soon as this paper web
106
moves over the flat surface
116
and conveys the paper web
106
by means of the rotation of the driving roll
122
.
The straightening plows
118
are provided at the end of the flat surface
116
opposite the trough structure
100
, as can be seen in FIG.
6
. The straightening plows
118
comprise an upper lip
124
and a lower lip
126
. In this arrangement, a pressure roll
128
is used for applying a pressure on a paper web passing between the pressure roll
106
will be maintained in contact with the driving roll
122
.
The direction of movement of the paper web
106
through the trough structure
100
is indicated by the arrow
130
in FIG.
6
.
Due to the fact that the driving roll
122
is arranged such that it projects through the opening
120
above the flat surface
116
, an axial displaceability of the driving roll
122
is not possible.
An apparatus of this type is known e.g. from U.S. Pat. No. 5,213,246, which achieves paper guidance by means of a trough structure in which the paper web flows, the trough structure being formed in one piece. Due to the structural design of this trough structure, a separate trough structure is required for each paper web width. In addition, when the paper web running through the trough structure is very broad and thin, only a very slight increase in the stiffness of the paper web can be reckoned with.
In view of the above-mentioned facts, known paper transport means are only capable of guiding paper webs having a specific width and paper thickness or it is necessary to use either so-called traction means or a complicated web-edge control for guaranteeing that the paper web moves along a straight path e.g. to a paper processing system.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide an apparatus for guiding an endless paper web which is capable of handling the paper web independently of its width and thickness without using any traction means or web-edge control.
The present invention is an apparatus for guiding an endless paper web having:
two lateral guide devices guiding the paper web at the longitudinal edges thereof;
a deflector with the aid of which the paper web is deflected at least once from its direction of movement while it is moving between the lateral guide devices; and
a first transport roll on a drivable shaft and a second transport roll for applying a feed force to the paper web passing between the first and the second transport roll.
The present invention is based on the finding that an increase in the stiffness of the paper web is achieved by vertically deflecting the paper web from the direction of movement, whereby the paper web will be prevented from ascending the lateral guide means and whereby damage to the paper web will be avoided when the paper web comes into lateral contact with the lateral guide means.
An advantage of the present invention is to be seen in the fact that paper costs can be reduced essentially, since the paper webs can be used with an unperforated edge thus avoiding the necessity of laterally cutting off the transport holes for optical or other reasons in the means used for further processing; this avoids an unnecessary consumption of paper and unnecessary waste paper, and additional edge cutting means can be dispensed with.
According to a preferred embodiment of the present invention, a wave-shaped path of movement or rather a wave-shaped deflection of the paper web from its direction of movement is achieved by means of a plurality of round bars between which the paper web passes. Since the deflection of the paper web can be adjusted to different paper web widths, paper thicknesses and strengths by adjusting one of the round bars and the distance of the lateral guide means, the apparatus for guiding an endless paper web is capable of handling paper webs with arbitrary paper web widths, paper thicknesses and strengths, respectively.
REFERENCES:
patent: 2050509 (1936-08-01), Swift et al.
patent: 2558788 (1951-07-01), Sillars
patent: 2595325 (1952-05-01), Baumgartner
patent: 3405883 (1968-10-01), Breitmeier et al.
patent: 4260116 (1981-04-01), Collin
patent: 4900172 (1990-02-01), Svoboda
patent: 5213246 (1993-05-01), Crowley
patent: 5663510 (1997-09-01), Niemann et al.
patent: 5695106 (1997-12-01), Bauknecht
patent: 5779
Bowe Systec AG
Glenn Michael A.
Mansen Michael R.
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