Cutting – Cutting motion of tool has component in direction of moving... – Orbital motion of cutting blade
Patent
1998-05-15
2000-11-07
Rada, Rinaldi I.
Cutting
Cutting motion of tool has component in direction of moving...
Orbital motion of cutting blade
83343, 83596, B26D 156
Patent
active
061420484
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention concerns a cutting device for a continuous material, in particular a corrugated web.
BACKGROUND OF THE INVENTION
A cutting device for web materials is known from DE 36 08 111 C1, which demonstrates two cutter bars positioned over one another. The cutter bar is directly driven on each end by an electric motor. The cutter bars are connected mechanically on both sides by intermeshing gear pairs. The intermeshed gears possess spiral gearing. One gear of a gear pair is movable. The disadvantage is that the angular momentum of all moving components, such as electric motors, gear pairs and cutter bars, is not minimized. Only two driving motors are used for one cutter bar. These motors must deliver the entire driving power for the cutting device. In addition, the intermeshed gears must be unnecessarily strongly constructed, thereby providing a high angular momentum, because the lower cutter bar must be driven with the corresponding torque.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a cutting device whose cutter bars are driven in exact synchronism, despite fluctuating rotational speeds, while the angular momentum of all moving components is minimized. The invention solves this problem by driving each end of a cutting bar pair directly with a drive motor. Because each end of a cutter bar pair is driven directly by a driving motor, the performance required by each motor is reduced, and with it the size of the motor. In this way it is possible to provide each end of each cutter bar with a driving motor which drives it directly. In addition, the angular momentum of each driving motor is minimized. Because the intermeshed gear pairs on the ends of the cutter bars no longer assume any significant burden, they can be constructed correspondingly weakly. The angular momentum of more weakly constructed gears is also minimized.
In one design of the invention the cutter bars are at least partially constructed of fiber-reinforced material, and preferably hollow. This minimizes the angular momentum of the cutter bars, thereby reducing the stress on each motor.
According to another design of the invention, at least one gear pair is constructed without play. This guarantees the cutting quality, because the blades cut one after another exactly in place.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained further with the aid of the examples illustrated in the following drawings. The drawings show:
FIG. 1 a schematic vertical cross-section of a cutting device for a continuous material, in particular, a continuous corrugated web;
FIG. 2 an electrical automated logic diagram for a control system for the cutting device drive for synchronism, rotational speed and/or number of revolutions;
FIG. 3 an automated logic diagram for a different design of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The cutting device 1 possesses vertical, stable and parallel mounting parts 2 and 3, which rest on the base 4.
In mounting parts 2 and 3, cutter bars 5 and 6 run along bearings above bearing 7 in such a way that they can rotate. Cutter bars 5 and 6 support blades 8 which are employed across from the longitudinal axis, running in the lengthwise direction.
Cutter bars 5 and 6 should preferably be hollow. They have axle stubs 9 at their ends. Cutter bars 5 and 6 should preferably be composed mainly of fiber-reinforced material. Axle stubs 9 are made of metal.
One driving motor 10 is connected directly to each axle stub 9. However, each driving motor 10 can also be connected by means of a coupling with axle stubs 9 (not illustrated). The driving motors 10 should preferably be electric. However, they can also be hydraulic.
The cutter bars 5 and 6 placed over one another comprise a cutter bar pair. Cutter bars 5 and 6 are placed parallel to one another in mounting parts 2 and 3.
Gears 11 and 12 sit on axle stubs 9. The upper gears 11 are separated into two separate gear components. One gear component of each gear 11 is seated on axle stub 9 so that i
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Bradatsch Edmund
Mosburger Hans
Reis Christoph
Titz Felix
BHS Corrugated Maschinen und Anlagenbau GmbH
Culbertson Russell D.
Rada Rinaldi I.
Tran Kim Ngoc
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