Winding – tensioning – or guiding – Convolute winding of material – With cutting – perforating – or notching
Reexamination Certificate
2000-01-13
2001-11-27
Rivera, William A. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With cutting, perforating, or notching
C242S541700, C242S542000
Reexamination Certificate
active
06322020
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 199 01 112.5, filed on Jan. 14, 1999, the disclosure of which is expressly incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a reel winding device and process for winding a web onto a wound reel. The reel winding device includes a winding bed formed by at least one king roll and at least one additional reel support, and a separating device having a cutter arranged on a cutter holder that is displaceable between an operating position and a normal position.
2. Discussion of Background Information
A reel winding device is known, e.g., from EP 0 529 407 B1, that includes a winding bed formed by two king rolls. A separating device, that is retracted into the winding bed from below, includes a movable cutter holder which can be swiveled. In this manner, the cutter, which is positioned on one end of the movable cutter holder, approaches a king roll, and the other end of the cutter holder is supported against the other king roll. When the wound reel is ejected from the winding bed, the web is torn off at a cutting edge of the cutter.
A further development in reel winding devices is disclosed, e.g., in EP 0 540 896 A1. The movement of the cutter holder, which is intended to assume a similar position upon cutting, is controlled by alternative devices to enable the web to be cut when the wound reel assumes a smaller diameter and thus sinks deeper into the winding bed.
Further, EP 0 460 395 B1, for example, discloses a winding device having a separating device arranged beneath the king roll. The cutter is fastened to a cutter holder, and the cutter holder is connected to a lever rod which assures that the cutter can describe the path of an arc as it moves into the winding bed. In the operating position, the cutter holder, which exhibits a curvature, rests against the king roll.
Such winding devices serve to wind webs, e.g., paper or cardboard, onto a wound reel. The webs supplied often have a greater length than a single wound reel can accept and/or are continuous. Thus, it is sometimes necessary to split the web in a direction crosswise to its longitudinal direction, remove the “full” wound reel, and insert a new winding core. However, separation of the web is not always actually achieved by a cutting process. Rather, the web is often merely torn off over the cutting edge of the cutter. The cutting edge is therefore often notched or constructed with a row of nibs, so that the web is first perforated and then torn off along the perforation line. This process, nevertheless, is described as “cutting.” The quality of the cut in this process is dependent on, among other factors, the position and angular orientation of the cutter and the tear resistance of the web. If the cutter is relatively dull, e.g., after somewhat lengthy use, and if the web being wound has a high tear resistance, e.g., a cardboard web, incorrect positioning of the cutter can result in failure to achieve separation. As a result, a rather lengthy interruption of the winding process can be caused because of the necessity of reworking by hand. For the aforementioned known devices, an operating position for the cutter is position which has proven to be sufficient for most applications. As a result, there are still situations in which the separation process is not satisfactory.
SUMMARY OF THE INVENTION
The present invention generally improves the separation process, and provides, in addition to the reel winding device of the type generally discussed, that the cutter holder is fastened to support arms which can be swiveled about a rotational axis of the king roll.
In this manner, an operating position of the cutter can be selected with a relatively high degree of freedom. For example, the type of material to be separated can be taken into consideration. Further, it is relatively simple to control the motion of the cutter because the cutter can be mounted to describe a circular path around the rotational axis of the king roll. Here, it may be especially preferable for the cutter holder to be fastened to the support arms in an articulated manner. Further, at least one support arm can include an auxiliary drive in which an angle between the support arm and the cutter holder may be adjustable. In accordance with the instant invention, it may be possible to maintain a distance between the surface of the king roll and the cutter by positioning the cutter. In this way, damage to the surface of the king roll which can be caused by the cutter can be avoided. In a cutting or operating position, the cutter can be brought near to the king roll, so that the cutter holder lies on the web and holds the web against the king roll. While the wound reel is ejected, the cutter holder is held securely by the auxiliary drive so that the cutter is supported across the width of the winding device with relatively high stability. As a result, a higher load capacity under the forces which arise. In spite of relatively few movable parts, it is possible to position the cutter at the optimal position by the combined action of the support arms and the auxiliary drive.
The cutter holder can preferably include a curvature which is matched to the curvature of the circumference of the king roll. In this manner, the web can be held flat on the surface of the king roll when the separation process is performed. Consequently, there is a relatively large holding force available for the web, even if the contact force of the cutter holder against the king roll is limited. However, if the web is securely held, the weight of the wound reel is sufficient in most cases to effect separation, even when the cutting edge of the cutter is dull. In addition, the cutter holder supports itself in this configuration by its curvature and by the positioning of the cutter holder at the king roll.
An auxiliary drive can preferably be coupled to the cutter holder in a region of the end of the curvature. The region of the end of the curvature can extend on both sides of a transition of the curve to an uncurved portion of the cutter holder. The optimal position can be easily determined through several attempts, i.e., empirically, by one skilled in the art. If the auxiliary drive is coupled to the end region of the cutter holder, it is possible to apply a certain initial tension to the circumference of the king roll, thereby increasing the stability of the cutter holder during the cutting process.
At least one support arm can be connected to a drive to which a control mechanism is connected for adjusting a swivel angle as a function of the diameter of the wound reel. The swivel angle through which the support arm sweeps, starting from the normal position, is the primary standard of measure for attaining the operating position. The smaller the diameter of the wound reel, for example, the smaller the swivel angle can be, and the shorter the distance the support arm must travel in order to position the cutter in the operating position. The diameter of the wound reel can be determined relatively easily, e.g., a control mechanism can be supplied with a Boolean operation table, which assigns a specific swivel angle to each diameter region.
The auxiliary drive and/or the drive may be preferably constructed as linear drives. For example, piston-cylinder drives which are hydraulically or pneumatically driven may be used. Thus, a relatively sensitive positioning of the cutter in the operating position can be achieved.
The drive can preferably contact the support arm at the same position at which the cutter holder is fastened. In this manner, a quasi-translation-free transmission of motion from the drive to the cutter holder can be obtained. Only a single articulated connection is required, and the cutter holder is not subjected to a momentum force by the drive.
The cutter holder can preferably include a reinforcement profile at its end opposite from the cutter. This reinforcement p
Greenblum & Bernstein P.L.C.
Rivera William A.
Voith Sulzer Papiertechnik Patent GmbH
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