EP0776845B1 - Adjustable separating slot for paper sheets and the like - Google Patents

Abstract

A web and sheet sluice adjustable to different material thicknesses for sheets of paper or the like, which are fed to a processing or treating unit. The sluice has a passage gap between a friction roller, which rotates continuously during the working operation, and an axially parallel braking roller, which is radially adjustable in relation to the friction roller. An electric switching element sends a control signal for an electric circuit during the adjustment of the passage gap to the thickness of a sample located in the passage gap. The braking roller is rotatably mounted on the cylindrical eccentric of an eccentric shaft, which can be driven by a first electric motor drive and can optionally be adjusted to both directions of rotation, and with the friction roller stationarily stopped, it can be driven by a second electric motor drive at a speed of rotation that is substantially higher than the velocity of adjustment of the braking roller via a driving gear which can be moved out of its normal position. When the gap width to be set has been reached, the switching element, by the switching signal of which the two electric motor drives are stopped, is actuated.

Description

The invention relates to a different material thickness adjustable lock for paper sheets, paper webs, Foils or the like. Materials, each one Processing or processing device are supplied, wherein the lock between one during work continuously rotating friction roller and one in relation radially adjustable, axially parallel on the distribution roller Brake roller has a passage gap and a electrical switching element is present when setting of the passage gap to the thickness of one in the passage gap located pattern a control signal for a electrical circuit.

It is already a sheet feeder with a separating device known (DE-34 12 574 C1), the one rotating driven friction roller and a radially adjustable one Has brake roller with a braking surface on the circumference. The braking surface forms with the outer surface of the Rubbing roller has a wedge-shaped passage gap. To this Set the passage gap to a certain sheet thickness can, is on a carrier carrying the brake roller with respect to the friction roller and opposite the brake roller radially movable frame arranged, which one in Area of the passage gap on the lateral surface of the Rubbing roller has attachable touch surface. Besides, is the frame with an electrical signal switch Signal circuit provided by one of the position the brake roller with respect to the touch surface or the Rubbing roller sensing probe is actuated. At Reaching the correct size of the passage gap the signal circuit controlled by the signal switch optical and / or acoustic signal. The brake roller is arranged eccentrically on an actuating shaft, the Angular position can be fixed.

After setting the passage gap to one certain paper quality or certain sheet or Film width corresponding width, it is necessary that Frame again in a lifted from the passage gap Bring starting position and fix in this. To additional locking devices are required, which complicates the entire facility and accordingly make expensive. Overall, the attitude of the Pass gap to a certain sheet thickness with this Device cumbersome and time consuming.

The invention has for its object a lock to create the type mentioned, the opening width in the shortest possible time with the simplest handling an accuracy on a paper or paper to be processed adjust other material thickness, which is a trouble-free Work of the lock, especially for separating the bow and removal from a stack.

This object is achieved in that the brake roller rotates on the cylindrical eccentric one by a first electric motor drive drivable, optionally adjustable in both directions Eccentric shaft mounted and when stationary Rubbing roller by a second electromotive Drive with a compared to the adjustment speed the brake roller significantly higher rotational speed via a gear part movable from its normal position is drivable, that when reaching to be set Gap actuated by the switching element whose switching signal the two electromotive drives being stopped.

The particular advantage in the functional principle of this solution according to the invention is that the Setting the passage gap of the lock on the Thickness of a sheet of paper or the like not by a manual one Adjust the friction roller or the brake roller must, but that only the operation of a electrical or electronic switch or one Push button is required after the paper sheet, on whose thickness the passage gap is to be adjusted, has been inserted into the passage gap. In principle can also with this solution according to the invention achieve sufficiently high accuracy of the gap width, so that ensures trouble-free operation of the lock can be. Also the time it takes for hiring the width of the passage gap is needed is on a Minimum reduced because manual manipulations at the Adjustments can be completely avoided.

While it is possible in principle and in the following described embodiment is also provided for opening and closing the passage gap two to provide separate electrical or electronic switches, the embodiment according to claim 2 has the advantage that they have incorrect operations of the electrical control device completely avoided because only one manually switch to be operated is present.

With the embodiment according to claim 3, the functional principle justified delay between the The gap width corresponding to the paper sheet thickness is reached and the triggering of the switching signal by the Switching element exists, can be compensated very precisely. This improvement in setting accuracy is in the Usually only for very thin papers or foils required and only if between the Swing speed of the eccentric shaft and the speed of rotation the brake roller during the adjustment process not a sufficiently large gear ratio exists, i.e. if the brake roller is not essential turns faster than the eccentric. This is due to, that the actuation of the switching element by the Rotational speed or peripheral speed of the Brake roller depends, with which the movable gear part to operate the signal switch from its normal position is moved.

Further advantageous embodiments of the invention are The subject matter of claims 4 to 10. These configurations contribute to simplifying the structure, increasing the Functional reliability and partly to increase the Setting accuracy at.

Fig.1

den prinzipiellen Aufbau einer Vorrichtung zum Einstellen einer Schleuse für Papierbogen, Papierbahnen, Folien od. dgl. auf deren Materialdicke in teilweise geschnittener Seitenansicht;

Fig. 2

die geöffnete Schleuse bei maximaler Weite des Durchlaßspaltes in einer Stirnansicht II der Reibwalze und der Bremswalze aus Fig. 1;

Fig. 3

die gleiche Ansicht wie Fig. 2 bei geschlossener Schleuse;

Fig. 4a

eine Ansicht IV aus Fig. 1 bei geöffnetem Durchlaßspalt;

Fig. 4b

die gleiche Ansicht wie Fig. 4a, jedoch mit einer anderen Winkellage der Exzenterwelle;

Fig. 4c

eine der Fig. 4a entsprechende Teilansicht mit einer anderen Anordnung des von der Exzenterwelle betätigten elektrischen Schalters und einem anderen Betätigungselement für diesen elektrischen Schalter;

Fig. 5a

einen Schnitt V-V aus Fig. 1 während des Einstellvorgangs auf eine bestimmte Weite des Durchlaßspaltes;

Fig. 5b

die gleiche Ansicht wie Fig. 5a, jedoch in anderer Funktionsstellung des beweglichen Getriebeteils und der Exzenterwelle;

Fig. 5c

eine Teilansicht VI aus Fig. 5b;

Fig. 6

ein schematisches Prinzipschaltbild zur Steuerung der beiden elektromotorischen Antriebe.

An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. It shows:

Fig. 1

the basic structure of a device for adjusting a lock for paper sheets, paper webs, foils or the like. On their material thickness in a partially sectioned side view;

Fig. 2

the open lock at maximum width of the passage gap in a front view II of the friction roller and the brake roller from Fig. 1;

Fig. 3

the same view as Figure 2 with the lock closed.

Fig. 4a

a view IV of Figure 1 with the passage gap open;

Fig. 4b

the same view as Figure 4a, but with a different angular position of the eccentric shaft.

Fig. 4c

4a shows a partial view corresponding to another arrangement of the electrical switch actuated by the eccentric shaft and another actuating element for this electrical switch;

Fig. 5a

a section VV of Figure 1 during the adjustment process to a certain width of the passage gap.

Fig. 5b

the same view as Figure 5a, but in a different functional position of the movable gear part and the eccentric shaft.

Fig. 5c

a partial view VI of Fig. 5b;

Fig. 6

a schematic block diagram for controlling the two electric motor drives.

In the device shown in the drawing it is a matter of different material thicknesses adjustable lock for paper sheets, paper webs, Foils or similar materials, each with With the help of this device a processing or processing device be fed. The lock from a passage gap adjustable to different widths 1 formed between a friction roller 2 and one radial with respect to the axis 56 of the friction roller 2 adjustable, axially parallel brake roller 3. The The friction roller 2 is provided with a friction jacket 4 which e.g. on normal paper, a much higher one Has coefficient of friction as the friction jacket 5 with which the Brake roller 3 is provided. The friction roller 2 sits on a shaft 6, which during normal work, i.e. Separation operation continuously with one relatively high rotational speed, especially peripheral speed, driven, but which stands still, when the passage gap 1 is set to a new width must become.

The brake roller 3 is rotatable on a cylindrical Eccentric 7 of an eccentric shaft 8 is mounted. The eccentric shaft 8 is by means of two coaxial journals 9 and 10 rotatably supported in fixed bearings 11 and 12 respectively. While normal operation when the friction roller 2 rotates at a relatively high speed, the brake roller stands 3 silent. Your job is to prevent simultaneously two sheets of paper the set passage gap 1 happen. The task of the rotating friction roller 2 is to pass the individual sheets of paper through the passage gap 1 to be transported through.

The brake roller 3 is provided with a hub 13 which is attached to a worm wheel 14 with one Snail 15 is engaged. The screw 15 is on attached to a worm shaft 16, the axis 16 'at right angles to the rotation or bearing axis 17 of the eccentric shaft 8 runs and rotatable in bearings 19 and 20 and also against the action of a return spring 21 in the direction of Arrow 22 is axially movable.

So that the engagement between the screw 15 and Worm gear 14 when the eccentric 7 is adjusted does not change, the two bearings 19 and 20 in one in part of the frame not visible in the drawing, which in turn either on the hub 13 or on the Eccentric 7 is mounted.

Between the two bearings 19 and 20 is on the Worm shaft 16 fixedly arranged a spur gear 23, on which the return spring 21 is supported, the between this spur gear 23 and the lower bearing 20th the worm shaft 16 concentrically surrounds. The spur gear 23 is in engagement with a pinion 24 which is on the motor shaft 25 of an electric motor 26 is attached. By the spur gears of the spur gear 23 and Pinion 24, the spur gear 23 can be relative to Move the pinion 24 in the axial direction because of the axis 27 of the pinion parallel to the axis 28 of the Auger shaft 16 runs.

Offset in the axial direction with respect to the worm wheel 14 is on a concentric section 8 ' Eccentric shaft 8 attached a second worm wheel 31, the concentric to the axis of rotation or bearing 17 of the Eccentric shaft 8 is arranged. With this worm wheel 31 is a worm 32 which engages on a in two bearings 33 and 34 axially fixed worm shaft 35 is attached. On this worm shaft 35, whose axis 35 'is also perpendicular to the bearing axis 17th the eccentric shaft 8 is another worm wheel 37 attached, which engages with a worm 38 standing on the motor shaft 39 of a reversible, i.e. Reversible electric motor 40 sits.

While the eccentric shaft 8 by the assigned to it first electric motor drive in the form of the electric motor 40 around the axis of rotation and bearing 17 in both directions is optionally pivotable around the passage gap 1 to enlarge or reduce the brake roller 3 on the cylindrical eccentric 7 during the closing direction pivotal movement of the eccentric shaft 8 at a much higher speed with a Direction of rotation driven by in FIGS. 5a and 5b arrows 42 is indicated. The opposite direction the pivoting movement of the eccentric shaft 8 and the Eccentric 7 with the brake roller 3 rotating thereon is in 4a to 4c indicated by the arrows 43.

In the axial displacement range of the worm shaft 16, about which the brake roller 3 with high rotational speed is driven, there is an electrical switching element 45 in the form of a microswitch 46, the Shift lever 47 are actuated by the worm shaft 16 can. Also in the swivel range of a flattened portion 48 of the Bearing pin 10 of the eccentric shaft 8 is the Shift lever 49 of a microswitch 50, which is another electrical switching element 51 for determining the initial angular position the eccentric shaft in which the Lock, i.e. the passage gap 1 for loose insertion of a sheet of paper B is open, on the thickness d of which Passage gap 1 should be set.

In the embodiment shown in Fig. 4c is the Bearing pin 10 not with a flat 48 but instead adjustable with one in the circumferential direction patch switch ring 52 provided by means of a radial clamping screw 55 is fixed and one has radial incision 53 ', in which the shift lever 49 of the microswitch 50 can occur when the Eccentric shaft 10 shown in Fig. 4c or in Fig. 4a Starting angular position in which the Passage gap 1 its largest, preferably to about 1 mm has a defined width w.

The time required to pass the passage 1 to the desired thickness d of a sheet of paper or the like. Setting the appropriate width w depends depending on the starting angular position of the eccentric shaft 8 pivoted in the closing direction of arrow 43 must be and how large the setting angle to be traversed is β. That is why the provision of the on the trunnion 10 of the eccentric shaft 8 adjustably fastened Switch rings 52 have the advantage that you can change its angular position with respect to the eccentricity plane 53 can also change their starting angular position. At the same time it also gives you the opportunity to do the initial Opening width w of the passage gap 1 and thus the To change the setting angle β.

The eccentricity level 53 is the level in which both the axis of rotation 17 of the eccentric shaft 8 and the axis 54 of the cylindrical eccentric 7 lie.

If, as provided in the exemplary embodiment, the initial opening width w of the passage gap 1 is to be approximately 1 mm, an eccentricity e of approximately 1 to 2 mm is expediently selected and an initial angular position of the eccentricity plane 53, in which its angular distance α of the connecting plane 55 between the axis 56 of the friction roller 2 and the rotation or bearing axis 17 of the eccentric shaft 8 should not be greater than 120 °. Given the assumed eccentricity e of approximately 1 mm to 2 mm, preferably 1.5 mm, it is also achieved that the setting angle β can be smaller than 90 °. In addition, there is the advantage that the radial movement component of the pivoting movement of the brake roller 3, which is related to the axis 56 of the friction roller 2, is smaller in the final phase of the actuating angle β than in the initial phase thereof, so that the desired width w1 can be set much more precisely. In the final phase of the positioning angle, this radial movement component goes towards zero according to the sine function. This gap width w1 can be, for example, 0.1 mm and correspond to a sheet thickness d of 0.1 mm, which in turn corresponds to a paper weight of 80 g / m2.

The operation of the lock described above in its construction is described below in connection with the circuit arrangement shown in FIG. 6. For the sake of simplicity, this circuit arrangement is provided with mechanical contact switches or with two switching relays R and R ' , with which the two electromotive drives 26 and 40 are controlled.

As can be seen, the two electric motors 26 and 40 are connected in parallel to the two switching relays R and R ' , the switching relay R having contact switches r1 , r2 and r3 , while the switching relay R' has a total of four contact switches r'1 , r'2 , r '3 and r'4. In the circuit of the switching relay R , the switching element 51, a push-button switch T1 which can be operated by hand, and a switching contact r'4 of the switching relay R ' are in series with one another , wherein the push-button switch T1 designed as a closing switch can be bridged by a self-holding contact rl of the switching relay R. is.

In the circuit of the switching relay R 'are connected in series to each other, the switching element 45, a pushbutton switch T2, which is operated manually, and a switch contact r3 of, whereby the pushbutton switch T2 switching relay R through a self-holding switch contact r'1 of the switching relay R' can be bridged. With the help of the switching contacts r2 of the switching relay R on the one hand and the switching contact r'2 of the other switching relay R ' , the direction of rotation of the electromotive drive 40 and thus also the pivoting direction of the eccentric 7 or the eccentric shaft 8 can be reversed.

The electric motor drive 26 is switched on and off by the contact switch r'3 , which is located in its circuit.

In order to reset the lock or the passage gap 1 to a different paper thickness or width w1 , the relay R is initially excited by briefly actuating the pushbutton switch T1 , which closes the self-holding contact switch r1 , opens the contact switch r3 and switches the contact switch r2 , so that the electric motor drive 40 causes a pivoting movement of the eccentric in the opening direction, ie in the direction of arrow 42 (FIGS. 5a and 5b). This pivoting movement is ended by actuating the switching element 51, the switch of which is opened. The relay R then drops out again. The initial state shown in FIG. 6 results again.

The passage gap 1 is now set to a maximum width W of 1 mm.

In this state, a paper sheet B, the thickness d of which the passage gap 1 is to be adjusted, is pushed into this passage gap 1 and held either manually or by means of a special holding device. By actuation of the key switch T2, the relay R is now 'energized which closes the switch contact r'1, r'2 switches the switching contact, the switching contact r'3 closes and thus the motor drive switches 26 and at the same time opens the switching contact R'4, so that an operation of the pushbutton switch T1 that is not intended during this time remains ineffective.

By briefly actuating the pushbutton switch T2 , the two electromotive drives 26 and 40 are thus switched on together. The brake roller 3 executes on the eccentric 8 a continuous rotary movement with an angular velocity which is approximately 30 to 40 times greater than the angular velocity of the eccentric 7 rotating in the closing direction of the arrow 43 about the rotary and bearing axis 17. The friction roller 2 stands during this time silent.

As soon as the brake roller 3, which rotates in the opposite direction of rotation for the pivoting movement of the eccentric 7, presses the inserted sheet of paper B so strongly against the surface of the stationary friction roller 2 that the brake roller 3 comes to a standstill, the worm 15, which continues to rotate, becomes due of the worm engagement with the worm wheel 14 with its worm shaft 16 and the spur gear 23 moved axially downward (based on FIGS. 1, 5a, 5b and 5c), so that the worm shaft 16 via the switching lever 47 of the microswitch 46 opens the switching element 45 and the Circuit of the switching relay R ' breaks. The contact switches r'1 , r'2 , r'3 and r'4 then all immediately return to their starting position shown in FIG. 6, in which the two motor drives 26 and 40 are switched off. With the opening of the switching element 45, the two electric drives 26 and 40 thus stop immediately. Due to the relatively high difference between the speed of rotation of the brake roller 3 and the pivoting speed of the eccentric 7, the slight time delay that arises between the standstill of the brake roller 3 and the opening of the switching element 45 is hardly noticeable to the reduction in the passage gap 1 taking place during this time Especially when, in the final phase of the setting angle β, the radial movement of the eccentric relative to the pivoting angle with respect to the axis 56 of the friction roller 2 is substantially less than in the initial phase of the setting angle β.

With the device according to the invention described above, the passage gap 1 of the lock can thus be set very quickly and precisely to the thickness of the paper sheet B , a film or the like which has just been inserted. A special skill of the operator is not required, since this setting is done automatically with the help of two self-controlled electric drives.

Instead of the circuit arrangement shown in FIG. 6 or a similar circuit arrangement with mechanical switching elements, an electronic control device controlled by a microprocessor or the like can also be provided, which only requires one of the two pushbutton switches T1 or T2 and an automatic, alternating switchover between the opening process described and performs the closing operation of the passage gap, also described. It is then only necessary to actuate the same key switch T1 or T2 once to open the passage gap 1 and to adjust it to a specific thickness d of an inserted sheet of paper or the like.

With an electronic control circuit it is also without Difficulty possible, the drive 40 of the eccentric shaft 8 each after completion of a in the closing direction of the Passage gap 1 extending adjustment movement a brief change in its direction of rotation perform minimal opposite opening movement to let through which the passage gap again by 0.01 to 0.04 mm is expanded. The one described above Time delay when switching off the electromotive This enables drives to be compensated.

The expedient with little backlash self-locking intervention between the The worm wheel 14 and the worm 14 also have the Advantage that there is a further locking of the brake roller 3 not required during normal work.

Another advantage in handling the described The order is to be seen in that with the Passing a certain number of sheets in the range of Passage gap 1 wearing friction jacket 5 after each new setting of the passage gap 1 with another Circumferential section adjusts to the gap area. Moreover is easy to do one before the next setting of the Passage gap 1 required adjustment i.e. slight rotation of the brake roller 3 on the resting Eccentric 7, either by briefly switching on the Electric motor 26 or by manually turning the To accomplish screw axis 16.

Claims (10)

1. Sluice, adjustable to different material thicknesses, for paper sheets, paper webs, films or similar materials which are fed to a processing or treating device, whereby the sluice comprises a passage gap (1) between a friction roller (2) which rotates continuously during working operation and a braking roller (2) which is radially adjustable and axially parallel relative to the friction roller (2), and in which an electric switching element (45) is provided, which on adjusting the passage gap (1) to the thickness (d) of a pattern located in the passage gap (1) emits a control signal for an electrical switching circuit,
   characterised in that
   the braking roller (3) is mounted rotatably on the cylindrical eccentric (7) of an eccentric shaft (8) which is driven by a first electric motor drive (40) and is adjustable optionally in both directions of rotation, and with a fixed stationary friction roller (2) is driven by a second electric motor drive (26) with a much higher speed than the adjustment speed of the braking roller (3) by a gear means (15, 16) that can be moved out of its normal position, that on reaching the gap width (W) to be set actuates the switching element, by means of which switching signal the two electric motor drives (26, 40) are stopped.
2. Sluice according to claim 1, characterised in that for controlling the two motor drives (26, 40) a microprocessor is provided, which is assigned an only manually operated electric or electronic switch (T1, T2) for opening and adjusting the passage gap (1), which switch upon repeated actuation alternately switches on the first drive (40) of the eccentric shaft (8) for opening the passage gap (1) and both drives (26, 40) for adjusting the passage gap (1) to the desired width (W1).
3. Sluice according to claim 2, characterised in that the drive (40) of the eccentric shaft (8) upon completing an adjusting movement in the closing direction of the passage gap (1) with a brief reversal of its direction of rotation performs a minimum opposite opening movement, by means of which the passage gap is widened again by 0.01 mm to 0.04 mm.
4. Sluice according to one of claims 1 to 3, characterised in that for actuating the switching element (45) an axially movable gear shaft (16) is provided, which on the one hand is connected by a gear worm (15) to a worm gear (14) that is mounted on the eccentric (7) of the eccentric shaft (8) and connected rotation-fast to the braking roller (3) and on the other hand is connected by an axially displaceable gear engagement means (23, 24) to the second electric motor drive (26).
5. Sluice according to one of claims 1 to 4, characterised in that the two drives each comprise electric motors (26, 40) which can be controlled separately, whereby the electric motor (40) of the first drive is reversible.
6. Sluice according to claim 5, characterised in that for the electric-motor-positioning of the eccentric shaft (8) in its respective initial angular position an electric switching element (51) is provided the switching status of which is determined by the angular position of the eccentric shaft (8).
7. Sluice according to claim 6, characterised in that for actuating the switching element (58) an actuating element (52) adjustable in circumferential direction of the eccentric shaft is arranged on the eccentric shaft (8).
8. Sluice according to one of claims 1 to 7, characterised in that the braking roller (3) on adjusting the passage gap (1) is driven at an angular velocity which is at least 25 times greater than the angular velocity of the eccentric shaft (8).
9. Sluice according to one of claims 1 to 8, characterised in that the sleeve surface of the friction roller (2) has a higher coefficient of friction than the sleeve surface of the braking roller (3).
10. Sluice according to one of claims 1 to 9, characterised in that in the starting position of the eccentric (7) the width (W) of the passage gap (1) is at least one tenth smaller than its eccentricity (δ), and in that the plane of eccentricity (53) forms an obtuse angle (δ) with a connection plane (55) between the axis of rotation (17) of the eccentric shaft (8) and the axis of rotation (56) of the friction roller (2), which is smaller than 120°.

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