Cutting – Processes
Reexamination Certificate
1998-12-09
2001-03-06
Peterson, Kenneth E. (Department: 3724)
Cutting
Processes
C083S613000, C083S956000, C083S577000
Reexamination Certificate
active
06196095
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a method and apparatus for cutting continuous webs of paper with advance feed holes, which are fed via a feed, after the advance feed tapes or perforated edge strips have been severed, to a transverse cutter arrangement with a non-driven bottom blade and a driven upper blade.
The continuous paper webs for high speed printers and computer systems are cut into single sheets at fixed or variable rates; the cutter has to function cyclically according to its method of operation. During the cutting procedure the paper stands still. The result is that the paper is stressed up to the vicinity of its limit of elasticity at each start up, because a certain period of time also elapses for the cutting process. The transverse cutter, with which the paper web is severed into individual sheets, has to be operated twice in short succession, so that a perforation between the sheets is severed and/or the forms can be cut to the desired dimension.
If a total cycle time is set at 100 msec. for a gross format of 12″, upper blade of the cutter stands still for about 75 msec. and is then moved twice in the remaining 25 msec. However, this means that the upper blade which has to carry out a stroke of about 12 mm, has less than 25 msec for two strokes. That means that the blade would have to be moved at a speed of at least 25 meters average per second, if an acceleration distance and a deceleration distance in the working stroke and again in the return stroke did not also have to be taken into consideration. For this reason the speed has to be set much higher.
To date, the conventional eccentric drives have not improved the situation at these speeds, if the necessary speed is not to be obtained by oversizing.
SUMMARY OF THE INVENTION
An object of the invention is thus to provide a device, with which the continuous paper webs can be severed transversely in between transportation cycles at the paper's maximum allowable rate of feed. This problem is solved according to the invention by using as the drive for the upper blade one of multiple linear motor(s), whose stator (stationary bobbin) is fastened to the carrier for the blade guide, and by designing the blade as a rotor (magnetic plunger) or armature of the linear motor.
In addition, the invention relates to a method of operating the device wherein the linear motor is driven with a small amplitude vibration at least just before the cutting stroke current surge in the exciter winding of the stator, in order to thus move the blade back and forth, and the cutting stroke current surge is triggered at the upper reversal point of the vibration or shortly thereafter.
Linear electromagnetic motors have been known for a long time. Thus, for example, an electric linear motor for limited adjusting movements of magnetic heads is described in DE-C-19 15 548. The problem that had to be solved with it was the immediate stoppage with high braking acceleration when the motor current is interrupted. Thus, this invention is in a distant field. A similar use of a linear motor is described in DE-C 33 17 521 and DE-C-33 17 523. Both documents use a linear motor for the precision adjustment of sound heads, wherein the speed is irrelevant. A detailed description of the advantages and disadvantages of electromagnetic linear motors is set forth in EP-A-0 203 222.
In the present invention a linear motor drive capable of high acceleration is paramount. The precision of the stroke or the space for an eccentric drive is only of secondary importance.
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A-Tronic MGM AG
Peterson Kenneth E.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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