Sheet feeding or delivering – Feeding – Separators
Patent
1998-06-02
2000-09-26
Skaggs, H. Grant
Sheet feeding or delivering
Feeding
Separators
271 94, 271 311, 27126504, 271150, 271153, 271155, 271 1006, B65H 702
Patent
active
061233307
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for feeding flat items for separation by suction of material input into a distributing unit by using a feeding device, preferably comprising a separating blade and a conveyor belt arranged underneath.
The items are fed to the system for separation by suction by way of the separating blade and the conveyor belt arranged underneath. If the pressure in the item stack is high, there is danger that two articles are pulled off at the same time as a result of the frictional force between the individual items. On the other hand, if the item stack is not compact enough, the throughput is relatively low. The individual items additionally can tip over, thereby worsening the pull-off behavior. For that reason, a certain stack pressure range must be maintained in the separating region.
A suction device is installed underneath perforated friction belts to achieve an increase in the frictional force between the first item and the friction belt for the separation system. Consequently, the stack pressure is up to now checked with sensing levers and position sensors, which switch the separating blade and the conveyor belt underneath and thus also the item feeding device on and off via a two-position control. The sensing levers here are located in the region where the items are suctioned out. The sensing levers are consequently actuated by an excessively high stack pressure as well as by items that are suctioned in. The operation for controlling the stack pressure thus is not defined clearly. Thus, suctioned-in postcards can stop the separating blade and the conveyor belt underneath via the sensing levers as soon as a gap forms in the stack of items in front of the pull-off location. After all the items in front of this gap have been separated, the feeding device must move the item stack at least by the amount of the gap in the direction of the pull-off point until further items can be separated. As a result, larger gaps form in the conveying section, following the separation, and these worsen the throughput. In those cases, there is also an increased tendency to pull off two items at the same time, owing to the briefly increased stack pressure.
A further disadvantage arises from the fact that the sensing levers are spring-weight-systems, which vibrate strongly during the separation by suction.
SUMMARY OF THE INVENTION
It is the object of the invention, to create a method for feeding flat items to the system for separation by suction of material input, which method eliminates the shortcomings in the state of the technology, so that a steady feeding and separation of the item stacks is achieved.
The advantage of the solution according to the invention is that it removes the undefined condition during the control of the suction separation feeding, during which a feeding stop could be triggered by an excessively high stack pressure as well as a single item suctioned in.
In one advantageous embodiment, the thickness of the pulled-off item is determined via the deflection of a swivelling roller, by means of a rotary potentiometer. In a further advantageous embodiment of the invention, the stack pressure is measured at the feeding device via a spring-mounted and damped separating blade and position sensors, arranged on both sides of the separating blade.
The invention is explained further with an example and with the aid of the drawings, which show in:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 A basic diagram of a device for executing the method according to the invention;
FIG. 2 A basic diagram of a device for executing the method used heretofore .
DETAILED DESCRIPTION OF THE DRAWINGS
FIG. 2 shows that the item stack SS is fed to the system for separation by suction with the aid of the separating blade TM and the conveyor belt UB underneath it. In order to increase the frictional force between the first item and friction belts RR for pulling off the items, these belts have a perforated design with a suction device SW located underneath the friction belts RR. O
REFERENCES:
patent: 5029837 (1991-07-01), Uchiyama
patent: 5577720 (1996-11-01), Lasklowski
patent: 5645274 (1997-07-01), Ubayashi et al.
Kinberg Robert
Siemens Aktiengesellschaft
Skaggs H. Grant
Spencer George H.
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