Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Work-secured and/or work-guided
Reexamination Certificate
1999-02-05
2001-08-14
Osele, Mark A. (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Work-secured and/or work-guided
C156S447000, C156S494000, C156S522000, C156S527000
Reexamination Certificate
active
06273166
ABSTRACT:
The invention relates to a device for supplying of double-sided adhesive tape drawn from a roll to a pressure cylinder.
Flexographic printing is a rotative letterpress printing method for—as an example—printing on packaging materials, forms, films or similar, in which printing plates preferably comprising photo-polymers or rubber are glued to the pressure cylinders. To permit simple attachment of the printing blocks, it is known how to supply the pressure cylinder with a double-sided adhesive tape, onto which the printing block is glued in its turn. Thanks to the adhesive tape widths available today, it is necessary here that several adhesive tapes are affixed to the pressure cylinder adjacent to one another.
To ensure a perfect attachment of the printing block, in particular when various printing blocks are applied to various press rollers in order to produce color prints, it must be ensured that the pressure cylinder is provided with the double-sided adhesive tape over its full surface and without overlap. This however presents considerable difficulty and has not yet proved possible with simple technical measures.
According to DE 39 17 842 A1, a ring is attached to a cylinder of a conveying device such as a roller track using a double adhesive tape whose width corresponds to that of the ring.
In order to connect the ends of webs unwound from rolls, adhesive tapes are provided in accordance with DE 34 16 356 A1. The connected webs are passed between both stationary and swivelable rollers.
In the older, but not yet pre-published DE 195 25 403 A1, a double-sided printing block adhesive tape for the printing industry is described.
To align printing plates in precise positions on a pressure cylinder, an auxiliary rail receiving the printing plate is provided according to EP 0 144 334 B1 that can be aligned with the longitudinal axis of the pressure cylinder.
The problem underlying the present invention is to provide a device of the type mentioned at the outset which ensures that perfect covering of the pressure cylinder with a double-sided adhesive tape is possible, without the latter overlapping or having gaps between one another in the case of adhesive tapes that have to be arranged adjacently. In addition, air bubbles or creases should be ruled out.
The problem is substantially solved in accordance with the invention in that the device comprises a mounting base in which the roll of the double-sided adhesive tape is mounted axially parallel to the pressure cylinder, in that the mounting base has a pressure element acting on the double-sided adhesive tape in the direction of the pressure cylinder, and in that an edge extends from the mounting base in that direction with a cutting element running axially parallel. Here, the pressure element in particular is mounted movably inside the mounting base using gratuity or a selectively introduced force, e.g. by cylinders, weights, and is designed as a roller.
With the teachings in accordance with the invention, it is ensured that several double-sided adhesive tape rolls are arranged side-by-side on a common shaft, and that when the double-sided adhesive tapes are peeled off each roll they are applied to the pressure cylinder side-by-side at their edges without any gap or overlap occurring. This is because the fact that the double-sided adhesive tape rolls can be disposed on a shaft axially parallel to the longitudinal axis, i.e. on the shaft of the pressure cylinder, permits a flush alignment. It is furthermore assured that the double-sided adhesive tape can be cut to length exactly, i.e. also without any overlap, since the cutting element used is also aligned axially parallel to the pressure cylinder.
Alternatively, the adhesive tape can be supplied web for web to the pressure cylinder, where for example one adhesive tape roll is movable along a shaft and hence positionable.
It is assured using the pressure element that the double-sided adhesive tape is always subject to the necessary pretensioning for being affixed without creasing to the pressure cylinder. To do so, the pressure element such as the roller can run in a slot-like receptacle between which and the pressure cylinder the adhesive tape passes, such that the latter is subjected to pretensioning in the direction of the pressure cylinder. Swiveling in the direction of the cylinder and pressing by means of—for example—setting cylinders is also possible.
It is furthermore provided that the mounting base has receptacles, with the shaft of the pressure cylinder being supportable in the receptacles or the receptacles being supportable on the shaft of the pressure cylinder.
In other words, it is possible on the one hand to leave the pressure cylinder in the printing press or affixing equipment (printing block mounting equipment), and then to lift the mounting base with its appropriate receptacle against the pressure cylinder shaft, for example hydraulically. Alternatively the pressure cylinder with its shaft can be placed inside a corresponding receptacle of the mounting base in order to then affix the adhesive tape.
The receptacles themselves should extend from side pieces of the mounting base and can be formed preferably by Vee-shaped recesses.
A particularly simple design is achieved when each side piece has a first receptacle slot for the roll of the double-sided adhesive tape or for a shaft receiving the latter, and a second receptacle slot for the pressure element designed as a pressure roller. In this case the second slot runs in the direction of the shaft of the pressure cylinder, so that as a result the pressure roller always tries to slide inside the second slot in the direction of the pressure cylinder, thereby subjecting the double-sided adhesive tape to the necessary pretension.
Alternatively, the pressure element can be moved up against the pressure cylinder using adjusting cylinders.
In accordance with a further proposal of the invention, it is provided that the device has a work surface alone which the adhesive tape can be passed and on which the pressure cylinder rests rotatably, and that a lever element acts on the shaft area facing away from the work surface. The pressure cylinder is thus clearly fixed in position in order to permit rotation of the pressure cylinder. As a result, the adhesive tape is automatically applied to the surface of the pressure cylinder. It is then only necessary to cut the adhesive tape to the required length.
A receptacle for the double-sided adhesive tape or a shaft receiving this receptacle can extend from the work surface itself. The appropriate receptacles can be designed as legs or side pieces and are preferably adjustable relative to one another in order to be adjusted to the width of the pressure cylinder.
In addition, the shaft of the double-sided adhesive tape can be tensionable in order to pretension the double-sided adhesive tape when it is unwound.
In an embodiment of the invention, it is provided that both the pressure cylinder and the double-sided adhesive tape roll(s) or their shaft are mounted in a receptacle such as a Vee-shaped receptacle in side pieces of a mounting base, with the double-sided adhesive tape also being subjected to pretensioning in the direction of the pressure cylinder.
It is provided in particular that several double-sided adhesive tape rolls extend from a common shaft, with the double-sided adhesive tape rolls being arranged side-by-side on the shaft.
REFERENCES:
patent: 2501341 (1950-03-01), Krueger
patent: 3915786 (1975-10-01), Collett et al.
patent: 4030958 (1977-06-01), Stenemann
patent: 4608894 (1986-09-01), Lee et al.
patent: 4909878 (1990-03-01), Watanabe
patent: 5795432 (1998-08-01), Urban
patent: 3416356-A1 (1984-11-01), None
patent: 3917842-A1 (1990-12-01), None
patent: 0206760 (1986-12-01), None
patent: 144334-B1 (1987-07-01), None
patent: 0313510 (1989-04-01), None
Dennison, Scheiner Schultz & Wakeman
Osele Mark A.
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