DE1236385B - Device for automatic control of the weight per unit length of a cigarette rod - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

A24c

German class: 79 b -13/10

Number: 1 236 385

File number: J 20024 III / 79 b

Filing date: June 3, 1961

Opened on: March 9, 1967

The invention relates to a device for the automatic control of the weight per unit length of a cigarette rod with a means for changing the tobacco feed amount from the distributor, a removal means that removes the tobacco excess from the tobacco stream and a test device that checks the amount of tobacco in the cigarette rod and in Depending on the test result, the height of the acceptance means and thus the amount of the remaining tobacco stream changed.

A device for removing the at a certain height above the conveyor belt excess tobacco is already known. This is to ensure that a more even Tobacco flow enters the cigarette maker submachine, resulting in properly filled cigarettes target. The removed excess is returned to the distributor so that there are no losses. The excess tobacco itself is removed e.g. B. about opposite to each other ao rotating circular knives, via a spiked roller or other cutting devices.

It is also already a device for removing an unwanted portion of tobacco from one moving tobacco stream has been proposed, which is designed so that in when removing in a Channel promoted tobacco leaves in a known manner in front of the take-off point a compression means, for example a role, and then a comb-like means with extending in the conveying direction, up under the removal device extending prongs for holding down the in the annular recess the deflecting disc located tobacco are arranged so that the protruding between the prongs excess tobacco is removed by the removal device.

Furthermore, a method for controlling the amount of tobacco dispensed from the manifold is already one Cigarette rod making machine has been proposed to avoid the uneven surface of the tobacco stream Tobacco removed and the height of the acceptance level in the event of an unintentional deviation of the Tobacco amount of the cigarette rod from the target amount or when changing the format of the cigarette rod is changed, and in which the amount of tobacco dispensed from the distributor as a function of changing the height of the acceptance level is inevitably and simultaneously controlled, so that for example, when the target quantity is not reached, the acceptance level is then higher at the same time inevitably the amount of tobacco dispensed from the distributor is increased, and vice versa.

Device for automatic control of the
Weight per unit length of a cigarette rod

Applicant:

Industrial Nucleonics Corporation,

Columbus, Ohio (V. St. A.)

Representative:

Dipl.-Ing. H. Beschich, patent attorney,

Regensburg, Lessingstr. 10

Named as inventor:

Carlos C. Martin, Hilliard, Ohio (V. St. A.)

Claimed priority:

V. St. v. America 7 June 1960 (34 494)

The object of the invention is to provide a mechanically operating device with the aid of which the setting of the altitude is achieved in a structurally simple manner and inevitably , and to achieve a direct and spatially independent coupling with an electrical device that provides the means for changing actuated the tobacco feed amount.

According to the invention, this is achieved in that, in the aforementioned, already proposed type, depending on the change in the height of the removal level of the removal means, the means for changing the tobacco feed quantity from the distributor is inevitably and simultaneously controlled, with one per se for actuating the removal means known mechanical control device, e.g. B. a cam control, and for actuating the means for changing the tobacco feed quantity, an electric control element which is coupled to the control device and which is known per se are provided. The electrical control element is preferably designed as a sliding wire potentiometer, which represents one branch of a bridge circuit, and another branch of a bridge contains a further potentiometer

709 518/54

meter leading to a display device. The bridge circuit can be powered by a battery a voltage drop rheostat can be fed.

The setting the altitude is achieved in a structurally simple manner and inevitably via a linkage, while the Use of an electrical means known per se, e.g. B. a potentiometer, for actuating the By means of changing the tobacco feed quantity, a spatial independence is guaranteed and thus The advantage is that it is directly coupled to the curve in a simple manner, for example on the shaft can be attached to the curve.

The invention is described below using an exemplary embodiment in conjunction with the drawing explained. It shows

1 shows a simplified perspective illustration a machine for cigarette production with the control device according to the invention and

Fig. 2 shows a preferred embodiment of the electrical device according to the invention.

In the simplified schematic representation of a cigarette making machine according to FIG from the distributor 10 tobacco is applied to a horizontal belt 12 which runs under a first drum 14 is performed. The tobacco from the band 12 is pressed into a circumferential groove of the drum 14 and there z. B. held by suction. The stream of tobacco on drum 14 is monitored by a take-off knife 16 equalized and applied as a tobacco stream 18 to a traveling paper web 20 and over a Tubular band 22 is introduced into the rod forming device 24 forming the cigarette rod 26. The one from that The amount of tobacco 28 removed from the tobacco stream is taken from a further drum 30 taken over and returned from there to the belt 12 again.

The removal knife 16 is adjustable relative to the drum 14 with the aid of a lever system 34 which has a cam 36 and a push rod 38. The position of the cam 36 is continuously readjusted by a measurement and feedback system which includes a transducer 40 responsive to the weight per unit length of the string 26, an amplifier controller 42-44, a servo motor 46, and a gear 48 for driving the cam 36. The transducer 40 preferably has a radiation source 40 a and a radiation display device 40 b in a manner known per se. The control system preferably works with a tachometer 46 a, which is coupled to the servomotor or forms a unit with this, and represents part of an internal feedback loop, the control system working as a special analog device, the time integral of the deviation of the weight per unit length of the cigarette rod 26 is calculated and the cam 36 readjusts according to the value of the integral.

To generate an analog signal indicating the position of the cam 36, a device is provided which, in a preferred embodiment, is a sliding wire potentiometer 50 which is mechanically connected to the cam 36, as indicated by the dashed line 52. The potentiometer is electrically connected to the control unit 56 via lines 54. The control unit 56 has circuits which control the motor 58 via a drive connection 60, 62, 64. The distributor 10 is driven by a variable speed device, the angular position of the shaft 64 determining the speed at which the distributor dispenses tobacco onto the belt 12. The control device 56 can be designed similarly to the control device 44, in which case the motor 58 is provided with a tachometer 58 α. However, it is also possible to design the control unit 56 differently in a manner known per se, so that the tachometer 58 α can be dispensed with.

An essential feature of the invention can be seen in the system for generating the display signal for the knife position and for forwarding it to the control unit 56. This system can be seen in a preferred embodiment of FIG. In this case, the sliding wire potentiometer 50 represents a branch of a bridge that is fed from a voltage source (battery) 66 via a voltage drop variable resistor 68. The other branch of the bridge contains another potentiometer 70. The slide 50 α of the potentiometer 50 is mechanically connected via the connection 52 to the cam 36 adjusting the acceptance knife, while the slide 70 α of the potentiometer 70 via a control button 72 on a scale graduation of a display device 72 α is adjustable. As a result, a voltage corresponding to the knife position on slide 50 α of potentiometer 50 and a voltage corresponding to a preselected knife position on slide 70 α are obtained. The difference between these two voltages results in an error signal which is sent to the control unit 56 of the distributor.

To explain the mode of operation, it is assumed that the desired amount of tobacco is on the belt 12 is given and that the knife 16 is, for example, in the middle of its adjustment range that the control button 72 is also in its central position and that the cigarette rod 26 the required weight per unit length. Then the tax system remains ineffective. It will Weight of the cigarette rod is lower, the control unit 44 lifts the knife 16 so that more tobacco is introduced into the strand former 24, but less tobacco is returned to the belt 12 via the drum 30 will. The tobacco return flow represents a small reservoir that is controlled by the take-off knife control can be influenced in such a way that medium or short-term changes in the feed rate are compensated for can be.

If the lower weight of the tobacco rod is due to the medium flow of tobacco on the belt 12 being too small, the knife control has a regenerative effect. Raising the knife 16 results in a smaller return flow 28, which then again reduces the amount of tobacco that reaches the drum 14, which means that the knife 16 is raised further by the control device, etc. of the sliding wire slide 50 α results, its voltage is no longer equal to that of the potentiometer slide 70 α and the differential voltage deviates from zero. The control unit 56 is therefore effective and corrects the speed from the distributor 10. When the desired weight per unit length of the tobacco stream on the belt 12 is restored, the control unit has reset the knife 16 to its original position.

If an increase in the weight of the cigarette rod is determined, the control takes place in the opposite direction Direction.

Claims (3)

Patent claims: 1. Device for automatic control of the weight per unit length of a cigarette rod with a means for changing the tobacco feed amount from the distributor, a removal means that removes the tobacco excess from the tobacco stream, and a test device that checks the amount of tobacco in the cigarette rod and depending on the Prüferg ebnis "the height of the decreasing agent nd so that the" amount of the remaining tobacco stream changed, characterized in that in already otherwise Sugg Surfagene r Artjn dependence ~~ of the change of the Höhenl age of the decrease in eebene the acceptance means (16) ^ wangläuh ' g u nd simultaneously, the means (56 to 60) ao? eum changing the tobacco supply amount from the manifold (10) g esteuert, w obei for actuating the acceptance means (16) a known mechanical control device, eg. a Kuryensteuerung (36), and for actuating the means for changing the tobacco feed quantity, a to the control device (36) coupled, a n known electrical s control element (50) are provided. 2. Device according to claim 1, characterized in that that the electrical control element (50) is designed as a sliding wire potentiometer that represents one branch of a bridge circuit, and that another branch of a bridge contains a further potentiometer (70) which leads to a display device (72). 3. Apparatus according to claim 1 or 2, characterized in that the bridge circuit is fed from a battery (66) via a voltage drop variable resistor (68). Considered publications: German Patent No. 843 076;
German interpretative document No. 1082177. Legacy Patents Considered:
German patents No. 1127 777, 1163 213,
903 1 sheet of drawings 709 518/54 2.67 Bundesdruckerei Berlin