DE102007018398A1 - Sorting system for paper handling system, has separating and delivering head effectively connected with moving mechanism that is designed for variably provided pre-adjustment of distance of head - Google Patents

Abstract

The system (10) has a separating and delivering head (20) with a feed medium (7) for top sheets (1) of a pile (3) of sheets. The head is effectively connected with a moving mechanism (17). The moving mechanism is designed for variably provided pre-adjustment of a distance (d1) of the head for a barrier (5). The moving mechanism is arranged at a support (19) attached with a pile-side end of the head. The feed medium is provided with a friction roller (9) that is drivable for increasing the distance of head from the barrier. An independent claim is also included for a method for friction-locked separation and delivery of top sheets from a pile of sheets.

Description

The The invention relates to a sheet separation system based on the frictionally separating and conveying the topmost Leaf from a pile of leaves, such as papers or flat substrates or the like, over a hurdle by means of a separating and conveying head, which is a feed means for having the top sheet and wherein the head with a deflection mechanism is actively connected. The invention further relates to a sheet handling system with such a sheet separation system. The invention also relates a method for frictionally separating and conveying of the top sheet of a pile of leaves, like Papers or flat substrates or the like, about a hurdle, especially with such a sheet separation system, in which the separating and conveying head over the Deflection mechanism via a feed means for the topmost sheet is deflected causing paper separation.

Blattvereinzierungsungssysteme obsolete type are, for example, in AT 329 093 or DE 18 00 96 disclosed. These provide a uniform and forced, for example by an eccentric disc, moving lever mechanism, with which a pusher is moved parallel to a stack of sheets on the top sheet along a mandatory predetermined and always the same motion contour. The pusher carries at its free end a friction roller which is locked in a movement in the conveying direction against rotation and rotatable in the opposite direction of movement. As a result, the topmost sheet of the stack is supplied to a multiplier at each uniform reciprocating motion of the pusher. Such Blattunterzelungssysteme based on a disadvantageous concept, since an acting on the uppermost sheet due to the feeder with fixed friction roller separating and conveying force already due to the forced predetermined motion contour regardless of one of these force actually opposite resistance of the uppermost sheet for separating and conveying the same over a hurdle is. Such systems do not adapt to different paper thicknesses, in particular with different flexural stiffnesses, and are not suitable for modern paper handling systems because of the resulting numerous problems.

An initially mentioned advanced sheet separation system is known in US 5,377,969 and DE 199 50 307 C1 discloses, wherein a freely movable and drivable, frictional role in a plane parallel to the stack of the hurdle is movable away. In US 5,377,969 this makes it possible to independently set a distance of the frictional role from the hurdle, which is optimal for a certain rigidity of a sheet to be separated. In DE 199 50 307 C1 For example, a contact pressure of the roller can increase automatically due to a rocker bearing in leaves of greater rigidity.

Furthermore, in US Pat. No. 6,866,259 B2 and US 6,896,254 B2 discloses a sheet picking mechanism having an arm which is journaled on an axis of rotation and provided with a hinge along its length. On the stack side, the arm has a take-up roller which, when set in motion, exerts a moment on the take-up arm such that the arm can be rotated about the axis of rotation and bent at the hinge. According to US Pat. No. 6,866,259 B2 can be increased by an effective normal force especially on a thick sheet. According to 6,896,254 B2 For example, the take-up reel may be moved from a first position to a second position farther from a hurdle in the event that a moment applied to the reed should prove inadequate to move the reed across the hurdle.

An alternative embodiment of a sheet separation system, which is described above, is disclosed in US Pat DE 10 2004 038 753 B3 and DE 10 2004 038 971 B3 disclosed, wherein in each case a lateral suspension of a deflection mechanism is provided for a separating and conveying head. Such systems largely avoid advantageously varying normal forces in the course of a movement of the separating and conveying head. However, it has been found that the clearance caused by the lateral suspension mechanism to limit the movement of the separating and conveying head for high demands in modern paper handling systems is sometimes not precise enough.

at Such systems therefore have the problem of multiple feed (Multi Pick). Increasingly, in modern paper handling systems a multi-feeder are largely avoided. Desirable It would be the proportion of multiple imports in the Paper separation to reduce, in particular a paper separation with regard to different types of leaves and different environmental conditions more customizable and better too shape.

At this point is the invention of whose task it is a A sheet separation system, a sheet handling system and a singulation method in which the intake behavior improves, in particular is more accurate, preferably the proportion of Mehrfacheinzügen reduced sheet separation compared to known systems is.

The task is by a Blattvereinze solved lungs system of the type mentioned, is provided in the invention, that the deflection mechanism is designed for variable predefinable default setting a distance of the head to the hurdle and the feed means is formed with a drivable for increasing the distance of the head to the hurdle frictional role.

The Invention also implements a sheet handling system a sheet separation system according to the invention. In particular, a sheet handling system may be used as a sheet separating system and / or as a sheet conveying system and / or as a sheet feeding system be formed, in particular a combination in a single System is possible. Next, a sheet handling system as a duplication system, as a printing system or be formed as a scanning system, including a combination of these systems is possible in a single system. Possible is also a single sheet handling system, with only a single sheet Sheet can be inserted for editing.

Corresponding The invention also applies to the concept of the invention a method for frictionally separating and conveying of the top sheet from a pile of papers or flat substrates or the like about a hurdle, in particular with a sheet separation system according to the invention, in which the separating and conveying head over the Deflection mechanism via a feed means for the topmost sheet is deflected and a paper separation is effected. According to the invention, the method provides that a distance of the head to the hurdle variable in addition to over the deflection mechanism is pre-set and the distance of the head to the hurdle on the feed means with a drivable frictional role is increased.

It has been recognized by the invention that the major cause of multiple feed is that a feed force of the separating and conveying head (feed head) acting on the uppermost sheet of a stack of papers or flat substrates is a so-called "buckling" force in the case of a conventional one uniform deflection of the head over a separating distance beyond so far that the excess amount is sufficient, not only the topmost sheet, but also another or more other leaves against the buckling force - essentially a frictional, compression and bending force of Leaves - to push the hurdle, especially transport hurdle. A detailed explanation can be found in the filed unpublished German patent application 10 2005 056 634.0 the applicant.

A Accuracy of the separation distance can, as now also recognized, possibly be required in the millimeter range.

The Invention is based on the consideration that practically only in the area of the separation distance a balance between the "Buckling force" and the feed force exists. The opposite of the feed force Counterforces consist of the respective sum of friction forces, Compressive forces and bending forces at the transport hurdle together (buckling force) and a compressive force of the head on the Pile whose size and direction is conditioned by the shear force of the head mass and an angle-dependent one Normal force component of the counterforce on the paper stack.

Accordingly The invention is based on a sheet separation system in which the feed means with one for enlargement the distance of the head to the height of the drivable frictional Roll is formed. In such a system, the separation of the top sheet of a pile of leaves, so with Help a motor-driven frictional role, for example causes, resting on the stack of sheets against the resistance of the sheet and preferably against a spring force, to the rear until the tearing off of the top sheet, wherein the hurdle, 8.8 as a mechanical ramp, ultimately one Individual separation effected.

The invention has recognized that in the said system, such as. Ex 9 It can be seen that the balance between buckling force (B) and feed force (V) in the course of the deflection of the head over the separation distance is displaced surprisingly fast in favor of the feed force - this due to an increasingly reduced flexural rigidity of the sheet to be separated as well as a further increase the normal force on the leaf to be separated.

in principle is under a sheet in general any kind of a flat substrate or the like, for example a sheet of paper, a foil or the like. In particular, papers have many different Weights, adhesion properties and surface properties, which also depends on the ambient conditions in comparison wide parameter ranges can vary. The invention has realized that it is in the context of increased requirements at the leaf separation is required, variable conditions of this To take into account the nature of the need.

In addition, the invention has also recognized that not only the bending stiffness of a sheet depending on its nature and environmental conditions, for example in the case of a wavy sheet or a particularly heavy Leaf, can vary greatly. Also, the normal force at the contact point of the frictional role can be dependent in many ways, for example, the angle of an operatively connected to the head deflection mechanism to the surface of the top sheet - for example, by changing the height position of the top sheet - as well as the changing angle in the return of the head in the course a driven frictional role as well as possibly due to an increasing compressive force of a spring in the event that the head runs back against such a spring force. The result is a Papierstapelhöhenabhängige and Rücklaufwegabhängige change in the normal force in the separation, which adversely affects a constant Separierverhalten, especially with regard to avoiding a multiple feed.

According to the concept of the invention, this multi-layered problem is taken into account by the fact that the deflection mechanism is designed for variably predefinable presetting of a distance of the head from the hurdle. That is, the concept of the invention allows that the frictional role can be held on the ramp via an additional variably presettable Distanzvoreinstellung, ie thus with an adjustable mechanical pressure on a top sheet z. B. also during pushing up the hurdle after separation, as in 5 represented, can be held at the hurdle. Preferably, the additional and variably predefinable preset distance via the deflection mechanism is adjustable, for example, as in 8th shown. For example, a pressure on the uppermost sheet can be increased by presetting the distance of the head from the hurdle so that it is positioned comparatively close to the hurdle. It can also be built up as needed, a "negative" pressure by the head is actively placed by the hurdle comparatively far away.

Further advantageous developments of the invention are the dependent claims and indicate in particular advantageous possibilities, the concept explained above within the scope of the task, as well as to realize further advantages.

Preferably the deflection mechanism has a linkage at the stack side end of the head is attached. In particularly advantageous Way, a linkage at a stack remote end, in particular be pivotable, be held, especially on an upper inside a housing. It has been shown that the training the deflection mechanism on a linkage for implementation the concept of the invention particularly many possibilities offers.

in the Frame of a particularly preferred embodiment of the invention has a linkage on a first and second part, the telescopic relative to each other are displaced so that a distance of the Head to the hurdle variable presettable is preset. In other words, such a telescopic linkage in a particularly preferred manner serve the distance of the head to Hurdle depending - if not provided - after Demand, for example under a scheme, or an algorithm to evaluate and thus an advantageous distance preset according to requirements - that is variable - to specify. Advantageous One or more motors are provided for actuating a linkage. In a particularly preferred manner, the motor for telescoping a first and second part of the linkage relative to each other be provided.

in the In a particularly preferred embodiment, the deflection mechanism have a gear transmission. As a particularly advantageous has proved a gear transmission, the one on a second part of a linkage mounted rack and an attached to a first part of a linkage Has gear, which preferably cooperate such that the first and second part telescopically displaceable relative to each other are.

in the Frame of a particularly preferred variant of the invention a linkage a first and second, in particular to a common pivot axis, collapsible arm on, wherein attached to the first arm of the head, in particular the deflection mechanism is, and on the second arm a pivot means is arranged. The variant The invention has recognized that it is particularly advantageous to a further mechanism for increasing a normal force to provide the top sheet. Advantageously, this can be done lever-like linkage with an above explained serve first and second arm. The pivot means can be in an advantageous Be used to a first arm depending on the pivoting direction to position it so that a normal force on the top sheet increased or optionally, as needed, also lowered can be.

Preferably is a linkage to a pivot axis, in particular to a pivot axis on a housing, held. In particular Way, it has proven to be advantageous to achieve with the variant provided effect that a first and a second Arm of a linkage are arranged rigidly to each other. Preferably the pivoting means may comprise a spring or a spring mechanism, which to achieve the above-described function of Variant is designed.

additionally or alternatively, the pivot means may be a gear transmission exhibit. In a particularly preferred manner, the gear transmission a rack attached to a second arm of a linkage provided with a gear for cooperation is. Advantageously, a motor is provided for driving a gear, that with a attached to a second arm of a linkage Rack can interact.

In summary can in the context of the combined realization of the concept of the invention as well as the concept of the variant of the invention, a Blattvereinzelungssystem a deflection mechanism for variable predefinable default have a distance of the head to the hurdle as well as a Swiveling mechanism for variably presettable presetting of a Normal force of the head on the top sheet. Such a concept combined So the known advantages of a feed means in the form of a drivable frictional role for improvement with the concept of a variable pre-set distance of the head to the hurdle and a variably presettable default setting of a normal force Of the head. The aforementioned three components of this combination realize in a previously unknown manner a highly reliable Coping with a leaf separation even with the most diverse Sheet textures and environmental conditions. That can be an increased sheet conveying rate as well as avoiding multiple prints.

It may prove advantageous that the deflection mechanism, in particular a first arm of a linkage, and the head is integrated in one unit. This does not exclude that also has a swivel mechanism in addition to the head and the deflection mechanism is integrated in one unit.

As explained above, the pivoting means is advantageous to predefinable Presetting a bearing force of the head on the top sheet designed. Preferably, the deflection mechanism and / or the Swiveling means additionally or alternatively to the feed means controlled actuated. In a particularly advantageous manner can the feed means and / or the deflection mechanism and / or the pivot means are connected to a controller via which said mechanisms and means individually or advantageously are coordinated with each other.

Preferably has the feed means and / or the deflection mechanism and / or the pivot means on a drive means, in particular in the form of a Engine. In a particularly preferred embodiment three motors are provided, via which in each case the feed means, the deflection mechanism and the pivot means are driven.

Subject the feed means can this preferably further a shaft and a screw, by means of which a drive means and a frictive role are operatively connected. A similar or the same Training has also been advantageous for driving the pivoting means proven and may optionally also to drive the deflection mechanism be used.

As previously mentioned, is advantageously the head with a return means operatively connected, which in a preferred manner to the deflection mechanism is appropriate.

It has proven to be particularly advantageous in the context of a further education proved that a control for actuating the deflection mechanism and / or a pivoting means - optionally in addition or alternatively to the control and to the operation of the feed means - designed is, in particular, taking into account a specification and / or evaluation of one or more qualities of the supreme one Sheet from a pile of papers or flat substrates or like.

Preferably is in a particularly preferred embodiment of a Blattvereinzelungssystem a sensor is provided for receiving a distance between hurdles and a head and / or a sensor for receiving a movement of the uppermost sheet and / or a sensor for receiving an angular orientation of the deflection mechanism or the pivot mechanism and / or a sensor for receiving a state of the advancing means and / or one on the uppermost Leaf running sensor wheel, in particular for receiving a slip between advancing means and the uppermost sheet.

In Particularly preferred is a control with a previously mentioned Sensor operatively connected.

The Concept of the invention has proven to be particularly advantageous in terms to a sheet separating system in which the stack of a carrier, in particular in the form of a Hubbodens worn is. Preferably, the hurdle is formed in the form of a ramp.

advantageous Further developments with regard to the method are the subclaims and indicate in particular advantageous possibilities, the explained concept of the invention within the scope of the task, as well as to realize further advantages.

Especially in relation to the separation of leaves of known type It has proven to be advantageous that in the context of a first Variant of the method a distance of the head to the hurdle is given.

Especially with respect to unknown types of leaves, for example in the case of fast varying environmental conditions or frequently changing types of leaves can in the context of a second variant, a distance of the head to the hurdle and / or a normal force of the head on the top sheet in the frame be determined and specified a Separier algorithm. Preferably can be determined in a separating algorithm, whether within a predetermined period of time a separation has taken place.

Preferably can in a separation algorithm a distance between hurdle and head controlled gradually increased, if no or detected insufficient movement of the uppermost sheet becomes.

With In other words, a separation algorithm can be designed that in the event that within a given period of time no Separation takes place, a distance between hurdle and head is increased to a bending force of the uppermost sheet Reduce. This process can be part of a separation algorithm be repeated until a particularly advantageous predetermined Presetting the distance of the head to the hurdle is reached is. As part of the separation algorithm, it is determined by that a separation takes place within the time span. Additionally or alternatively, preferably in agreement with the successive increase the distance also a pivoting mechanism in the separation algorithm be varied to a normal force of the head to the top Successively increase or, if necessary, lower

In particularly preferably, in a Separier algorithm a Deflection mechanism and / or a pivoting means varies in a predetermined manner be operated.

In particularly preferably, therefore, in sheet feed operations, following a first sheet feeder run, a distance to the hurdle be increased as far as one for a controller deposited acceptable ratio of blade speed to feed rate of the head, in particular peripheral speed the frictional role is reached.

embodiments The invention will be described below with reference to the drawing. These the embodiments should not be relevant rather, the drawing is where explanatory useful, in a schematized and / or slightly distorted form. With regard to additions from the drawing directly recognizable lessons will be relevant to the art directed.

there It should be remembered that manifold modifications and changes in form and details of an embodiment can be made without departing from the general idea to deviate from the invention. The in the above description, features disclosed in the drawings and in the claims The invention can be used individually as well as in any desired Combination for the development of the invention essential be. The general idea of the invention is not limited to the exact shape or detail of those shown and described below Embodiments or limited to an object, which would be limited compared to the one in claimed in the claims subject. For specified rated ranges are also within the limits mentioned values as limits disclosed and arbitrarily usable and claimable.

The Drawing shows in:

1 a first particularly preferred embodiment of a Blattvereinzelungssystems according to a first variant comprising a deflection mechanism for variably predetermined presetting a distance of the head to the hurdle;

2 a detail of 1 relating to a sensor for controlling and regulating motors, for example in the embodiment according to 1 and the embodiment according to 3 ;

3 a second particularly preferred embodiment of a Blattvereinzelungssystems according to a second variant of the invention additionally comprising a pivot means for variably predetermined presetting a normal force of the head on the uppermost sheet;

4 a plan view of the embodiment of 3 ;

5 an exemplary sequence of a paper feed for different heights of a paper stack:

6 a representation for explaining the forces occurring and a predetermined distance d1 on a top sheet with a low stack of paper;

7 a force diagram for explanation the in 6 illustrated situation;

8th exemplary control procedures for (A) a frictional role motor (B) serving as a drive means, a motor for variably setting a head distance to the hurdle, and (C) a motor for variably specifying a normal force of the head from the uppermost sheet;

9 Force curves (A), (B), (C) a buckling force B and a feed force V for explaining the Mehrfacheinzugsproblematik;

10 a flow chart of a separating algorithm for determining an advantageous distance of the head to the hurdle and / or a normal force on the top sheet.

10 exemplary control processes for a frictional role motor, a motor for variably setting a head distance to the hurdle, and a motor for variably specifying a normal force of the head from the top sheet.

The embodiments of the device explained here and the method are used according to the concept of Invention for optimizing the reliability of the singulation of stack-shaped leaves, with the help of a Separation system to be separated. For each other Features have been used like reference numerals.

1 shows a blade separation system 10 in this case for papers, based on the frictional separation and conveyance of the uppermost sheet 1 from a pile 3 of sheets, here in the form of papers, over a hurdle formed here as a mechanical ramp 5 with the help of a separating and conveying head 20 who in 2 is explained in detail as a detail. The following as the head 20 designated separating and conveying head 20 has a feed means 7 for the top paper 1 on, wherein the feed means 7 with one to increase the distance of the head 20 to the hurdle 5 drivable frictional role 9 is formed. How out 2 further apparent, the feed means 7 also a wave 11 on, on a worm wheel 13 is arranged, by means of which a drive means present in the form of a feed motor 15 with the frictional role 9 is actively connected. The driven by the (electric) engine and the hurdle 5 away "backwards" running frictional role 9 , frictionally separates the Colonel resting sheet 1 a paper or substrate stack 3 from the rest of this pile 3 and leads this over the hurdle 5 , (in addition to the friction to the pile 3 acts as a "second" hurdle), a pair of roles 6 to.

The paper stack 3 is usually stored in a cassette in a slot 4 can be introduced. The ramp present on the cassette here represents a hurdle 5 for the paper, with the task of preventing multiple feeds.

With the help of this separating device (also called "feeder"), the single sheet 1 as explained, from the shaft 4 to be pulled.

The pair of roles 6 At the end of the ramp, which is commonly referred to as "exit rollers", in the present case has a separate drive and is activated by a sensor not shown in detail, which sits at the entrance of the pair of rollers for cost or other reasons, the sensor The exit rollers are then permanently driven, these roles have the function, the already partially separated sheet 1 Pull out of the shaft completely and transport it to the next device. The following paper handling system / device may be a printing device, a scanning device or any other single sheet processing or processing device or device.

The cause of multiple feeds is based on 9 explained in more detail. A multi-feed occurs in a separating and conveying process, in particular in the described sheet separation systems, with a roll 9 on. The role 9 is on a ramp and is motor driven, in this case against a spring force of a spring, not shown, and it runs on the uppermost sheet of paper 1 back. The head 20 finally has when tearing off the uppermost resting sheet 1 but especially for lightweight papers, a distance to the hurdle 5 beyond a separating distance D1, at which a present linearly represented feed force V exceeds a presently hyperbolic buckling force (B) and is sufficient to move, compress and bend more than one sheet against friction with the succeeding sheet transport.

In order to becomes a multiple deduction in the separating and conveying unit and thus a multiple sheet feeder for the following Device generated.

This can be used on terminals that only have single leaves can cause problems.

Even more likely is this multifeed when the coefficient of friction μs ₂ -s ₃ between the second and third sheets is less than the value μs ₁ -s ₂ between the first and second sheets.

This so-called "Ream Seam" condition already exists if the stack in the paper chute or in the cassette of several Teilsta is put together, which usually takes place when reloading the cassette.

Separation of a machine stacked paper stack and subsequent reassembly already has lower coefficients of friction in the transition areas of the stack 3 As a result, since the machine-assembled position of the leaves and thus the relatively constant friction coefficient to each other can hardly be simulated manually, but is generally smaller.

If no means to remove this multifeed in the following Terminal is set up, at least one intervention the user required to clear the paper jam. In extreme cases this can also trigger a service case associated with prolonged temporal failure of the entire system and thus resulting costs.

According to the concept of the invention, multiple feeds can be avoided even more reliably than heretofore. This is the head 20 with a deflection mechanism 17 operatively connected to the variable predefinable presetting one also in relation to 6 and 7 closer explained distance d1 of the head 20 to the hurdle 5 is designed.

In the present case is the deflection mechanism 17 with a linkage 19 formed, at the end of the Stapelseitigem the head 20 is appropriate. The linkage 19 is pivotable at a stack far end on a pivot axis 21 held on an upper inside of a case 23 for a in 4 held paper chute is held. The linkage 19 here has a first part 24 and a second part 25 on, which are telescopically relative to each other so displaced that a distance d1 of the head 20 to the hurdle 5 variable presettable is preset. For this purpose, the first part is present 24 and the second part 25 of the linkage 19 relative to each other via a motor 27 operated telescopically. In the present case this is done by the second part of the linkage 25 movable in the first part 24 of the linkage 19 is guided, with the second part 25 of the linkage 19 a rack 29 is attached and on the first part 24 of the linkage 19 a gear 31 attached, which is about the engine 27 is driven and in the rack 29 runs. By meshing the teeth of the gear 31 and the rack 29 can the gear 31 Roll on the rack and so on the second part 25 of the linkage 19 in the first part 24 pull in or push out of it. Depending on the control of the motor 27 a distance D1 of the head 20 to the hurdle 5 be set. In the present case is the engine 27 and the gear 31 on a common boom 33 of the second part 25 of the linkage 19 attached, the gear 31 directly on a shaft of the engine 27 is arranged, which is the boom 33 be upheld. The variable predefinable default setting of the distance d1 is presently indicated by the arrows 35 symbolizes.

An angle sensor S4 is used in the in 7 explained in more detail manner for receiving an angle a1, a2 between the linkage 19 and the inside 23 of the housing so as to accommodate a tilt - and thus to determine a normal force portion of a head 20 to the surface of the topmost paper 1 , In addition, both the engine 31 as well as the engine 15 provided with a sensor S1, S2, S3, whose sensor signals 41 in the in 1 represented by lines of a controller 39 can be fed to under evaluation of the sensor signals 41 corresponding control signals 43 to the engines 15 . 27 issue. This is the control 39 with appropriate software 45 and a power supply 47 Mistake.

2 further shows the detailed design of the sensor S1 and the sensor S2. Both sensors S1 and S2 - as well as the angle sensor S4 or the sensor S3 in 4 - Are presently designed as opto-sensors, but in a modification, all or partly be designed as Hall sensors. The sensor S2 is in the present case a timing wheel 49 assigned to one with the shaft 11 synchronized same or different wave 51 of the motor 15 is held and turns with this, taking the wave 51 the PWB of the sensor S2 interspersed.

The sensor 51 is a sensor wheel 53 associated with the move via the sensor S1, the corresponding sensor signals 41 supplies. Sensor S1 and sensor wheel 53 are at one end of an arm of a lever 55 held over an axis of rotation 57 against a force of a spring 59 is pivotable at the end of the other arm of the lever 55 attacks and on the housing of the engine 15 is fixed.

By the in 2 exemplified arrangement of an engine 15 together with the sensors S1 in the frame of the head 20 can via the clock wheel 49 on the axis 51 the active movement of the frictional role 9 be recorded. By scanning a separate sensor wheel running on the paper 53 , which as explained also performs the function of a clock wheel - can the slip between the frictional role 9 and the top sheet 1 be recorded.

In addition, as shown in 1 with the distance engine 27 the linkage via the telescopic arrangement of the first part 24 and the second part 25 in a running rail to each other via the reference numeral 31 . 29 illustrated rack drive in a particular Distance d1 to the hurdle 5 be kept or driven. Again, there will be an in 4 Detected closer clock wheel as the sensor S3 detects the direction of rotation and the number of rotations and a corresponding sensor signal 41 to the controller 39 transmitted, after which the respective Teleskoparmlänge can be determined to set the distance d1.

3 shows a further particularly preferred embodiment of a sheet separation system in a side view and in 4 the same embodiment is shown in a plan view, wherein the previously explained elements of the first embodiment according to the first variant of the invention taken over substantially identical and are provided with the same reference numerals.

In addition, has a linkage 18 of the sheet separation system 30 of the 3 a first arm 59 and a second arm 61 on that around a common pivot axis 21 are pivotable together and are arranged rigidly to each other. Again, the pivot axis in a manner not shown on the inside of a housing 23 held.

The first arm 59 is essentially that with respect to the embodiment of a sheet separation system 10 of the 1 explained features, in turn, the head 20 essentially functionally identical to the first arm 59 is appropriate. The first arm 59 is with the deflection mechanism 17 as based on 1 explained, while on the second arm a pivoting means 63 is arranged, in the present case via a gear transmission with the second arm 61 mounted rack 65 and one with the rack 65 interacting gear 67 is formed. Again, it's an engine 69 intended to drive the gear. The in 3 not shown angle sensor 37 again serves to detect an angular orientation A1, A2 of the linkage 18 , The sensor signals are - similar, as already based on 1 explained - again to a controller 39 transmitted due to the sensor signals 41 corresponding control signals 43 to the engines 15 . 27 . 69 returns.

With the normal force N _ges adjusting motor 69 in the present case, the linkage 18 over the arcuate rack 65 with the motor pinion as a gear 67 around the pivot axis 21 emotional. As required, a transmission can be used for finer angular resolution. In particular, with a timing wheel, not shown on the motor axis 71 an effective angle change calculable.

All in the context of 1 to 3 shown engines 15 . 27 . 69 are in the context of the present embodiment designed as a cost DC motors, but can optionally also be designed as stepper motors. In particular, all engines are 15 . 27 . 69 arranged on the motor axis timing pulleys and an opto or Hall sensor. The sensors are able to detect the beginning of a motor movement, the direction of rotation and the number of revolutions. In addition, the time and speed of a rotary drive shown above the engine can be detected. It can be detected in particular so that passive movements of the motor shaft, z. B. during a movement of the linkage 18 or the linkage 19 ,

5 In views (A), (B), (C) shows the sheet singulation process as it is from a sheet pitching system 30 of the 3 at different heights of a paper stack 3 for a top sheet 1 on a ramp 5 is done. Basically, with an in 1 to 4 Sheet separating system 10 . 30 a head 20 passively or actively recycled. A passive feedback is to be understood that as an electronic spring a constant path independent counterforce by a low current to the motor 15 is produced. Under an active return is to be understood that, as needed, a flow or return of the head 20 by energizing the motor 20 is activated. As an advantage, the head 20 for example, an unknown nature of the paper 1 at the start of delivery always at the hurdle formed as a ramp 5 being held. Alternatively, the head 20 even with a paper 1 of known nature at the feed start at a defined distance D1 to the hurdle executed as a ramp 5 be guided. The latter is done via a corresponding control of the engine 27 , A corresponding position P of the head 20 as they are in 1 and 2 can be represented by the sensors S1, S2, S3, S4 and the corresponding clock wheels on the motors 15 . 27 . 69 transmitted signals and on the present geometry are determined.

This is essentially determined by the in 7 illustrated angle a1, a2 and the corresponding lengths of the deflection mechanism 17 certainly.

How out 5 (A) can be seen, the head can 20 for example substrates, in the present case papers 1 , with unknown textures, first at a position P close to the corral 5 being held. One through the energization of the motors 27 . 69 adjustable pressure force or normal force N _ges is by default of the controller 39 so dimensioned that with less rigid paper no or only insignificant movement of the head 20 back at the hurdle 5 takes place during the separation process. This can, as already explained, be determined via the sensors S1 and S3.

For example, in a substrate with known textures one can be indicated by the arrows 35 shown feed direction and thus exerted during the separation force on the top sheet 1 via a corresponding current supply to the motor 27 be kept comparatively low to the head 20 to bring to a suitable position P to the ramp. Occurs after activating the frictional role 7 no paper movement registered by the sensors S1 and S3 becomes the energization of the head 20 ie the engine 15 gradually reduced until a measurable paper movement occurs. As soon as a paper movement is detected by the sensors S1 and S3, the energization of the motor can 27 be raised again to a multi-deduction, ie a multiple deduction of other papers except the top paper 1 - to prevent.

A correspondingly synchronized control of the motor 15 is in 8 (A) shown together with the reference numeral 72 indicated reduction by arrows 35 shown pressure force 35 on the ramp in 8 (W) at the engine 27 , A reduction can take place, for example, via an averaging of previous supply times, so that a distance setting or a pressure force according to arrows 35 can be reduced accordingly adjusted.

With a distance d1 between head determined in this way 20 and hurdle 5 can in the consequence - for the currently inserted stack 3 if same papers are loaded - a suitable algorithm for this stack for the further separation of the papers are set. In other words: The respective contact force N _tot can be reduced at the start of a sheet separation and as needed during the return of the head 20 increase. That's how it goes 7 can be seen, an additional normal force component N ₂ to the already higher normal force component N ₁ - due to the increasing angle α1, α2 thereto. This can be used to further reduce the return path. In other words, so can the bearing force of the head 20 after the first movement of the top sheet 1 can be reduced, if necessary, the head 20 , like out 5 in view (B) can be seen during the extraction phase of the separation process are raised. This is done by a corresponding energization of the motor 69 in a sheet separation system 30 according to 3 causes.

• 1. Es erfolgt eine Initialisierung nach Einschub einer Papierkassette. Das Gestänge 18, 19 fährt hoch bis zu einem Anschlag und anschließend wird der Auslenkmechanismus 17 betätigt um den Kopf 20 in eine Ausgangsposition zu bringen, die einer horizontalen Position am nächsten kommt. Der Bestromungswert wird so eingestellt, dass der Kopf 20 bis an die Hürde gefahren wird und anschließend wird die Bestromung reduziert bis eine Fallbewegung des Gestänges 18, 19 über die entsprechenden Sensoren S1, S2, S3 erkennbar ist.
• 2. Im Rahmen der in 5 Ansicht (B) ersichtlichen Separierung ist der Kopf 20 vergleichsweise nah an die Rampe 5 gedrückt bis eine Blattbewegung erkenntlich ist – dies detektiert durch die in 2 näher dargestellten Sensoren zur Erkennung einer Papierbewegung bzw. eines Schlupfs der friktiven Rolle 7. Danach erfolgt bedarfsmäßig ein in Ansicht (B) der 5 dargestelltes Anheben des Gestänges 18, 19 über den Motor 69 um den Druck auf das oberste Blatt 1 anzupassen.
• 3. Ebenfalls in Ansicht (B) der 5 ist dargestellt, dass bei geringer werdender Bestromung des Motors 69 dem Gestänge 18, 19 die Möglichkeit gegeben wird, den Kopf 20 nach oben auszulenken, um den Radius des Papiers 1 an der Rampe 5 zu vergrößern. Dadurch wird weniger Reibkraft des obersten Blatts 1 auf das Folgepapier ausgeübt und der Druck des Kopfs 20 gegen das Papier wird entsprechend angepasst. Eine Beibehaltung dieser Situation erfolgt, insbesonder unter Vermeidung eines Aufsetzens des Kopfs 20 auf den Stapel 3 um einen Mehrfachabzug zu vermeiden. Der Förderbetrieb des Motors 15 wird unter bedarfsmäßigem weiteren leichten Anheben des Gestänges 18, 19 beibehalten bis keine Papierbewegung durch die in 2 dargestellte Sensorik mehr detektiert wird.
• 4. Danach kann ein weiterer Separiervorgang gemäß 2., 3. eingeleitet werden, bis eine Situation gemäß Ansicht (C) der 5 erreicht wird, bei welcher der Stapel 3 eine vergleichsweise geringe Höhe aufweist.

In particular, a separation process results as follows:

• 1. It is initialized after insertion of a paper cassette. The linkage 18 . 19 goes up to a stop and then the deflection mechanism 17 pressed around the head 20 to bring into a starting position, which comes closest to a horizontal position. The current value is adjusted so that the head 20 is driven to the hurdle and then the energization is reduced to a dropping motion of the linkage 18 . 19 can be recognized via the corresponding sensors S1, S2, S3.
• 2. In the context of in 5 View (B) of apparent separation is the head 20 comparatively close to the ramp 5 until a leaf movement is recognizable - this is detected by the in 2 Sensors shown in detail for detecting a paper movement or slippage of the frictional role 7 , Thereafter, a demand takes place in view (B) of 5 illustrated lifting of the linkage 18 . 19 over the engine 69 to the pressure on the top sheet 1 adapt.
• 3. Also in view (B) of 5 is shown that with decreasing current to the motor 69 the linkage 18 . 19 the opportunity is given to the head 20 to deflect upward to the radius of the paper 1 at the ramp 5 to enlarge. This will reduce the frictional force of the topmost sheet 1 on the follow-up paper and the pressure of the head 20 against the paper will be adjusted accordingly. A maintenance of this situation takes place, in particular while avoiding the placement of the head 20 on the pile 3 to avoid a multiple deduction. The conveying operation of the engine 15 is under need further further light lifting of the linkage 18 . 19 keep until no paper movement through the in 2 shown sensor is detected more.
• 4. Thereafter, a further Separiervorgang according to 2, 3 are initiated until a situation according to view (C) of 5 is reached, at which the stack 3 has a comparatively low height.

An above 2nd and 3rd modified sequence with unknown substrates is as follows:
The head 20 is held very close to the ramp by means of the distance motor 27 and against the back pressure of the paper. The normal force is increased step by step until the first paper movement with an almost constant head distance to the ramp. From this point the pressure force is applied to the ramp with motor 27 reduced and a little later also gradually the normal force with motor 69 reduced. When extracting the paper, the normal force can then be further reduced to the active reduction of the support weight of the head to reduce the frictional force of the sheet auszienden to follower sheet and thus prevent vorseparierten subsequent sheets.

If, after initially increasing the normal force, there is no paper movement, the distance is increased slightly, again connected with the stepwise Increasing the normal force, etc. until paper movement.

After repeated successful Separierablauf the first leaves, the initial pressure on the ramp can be reduced, as the reference numerals 72 in 8 (W) demonstrate.

How out 6 and 7 can be seen from the angle a1 - measured by the angle detector S4 and the output length LS1 of the linkage 18 . 19 - the height h1, h0 of the stack 3 calculable. The sensor for the path length is on the engine 27 realized as a roll sensor as explained above, but can also be realized in any other way. If the head 20 on the pile 3 From the angle a1 or from the angle a2 and the height h1 or h0 assumed to be constant for the return operation, a new distance d1 can be calculated. Thus, depending on the distance d1 to the hurdle 5 an additional normal force N _tot over the engine 69 on the support position point P of the head or the frictional role 7 be initiated. This process, synchronized to the further motor movements, is in view 8 (C) shown.

8 (C) shows one for the engines 15 . 27 . 69 Combined and coordinated control for adapting a distance d1 of a head 20 to the hurdle 5 - And thus a compressive force on a top sheet 1 when tearing it and separating it ( 5 (A) , (B), (C)) as well as an adjustment of the normal force N _ges on the top sheet 1 taking into account the position P of the head 20 ,

9 illustrates in view (A) the problem of a multi-feed in the event of a too fast return of the head 20 and in the event of excessive head weight of the head 20 , It can be seen that the multiple collection risk from the separation distance D1 to position D2 with rapid return of the head 20 and at comparatively high normal force N _{ges is} comparatively large, it is achieved too large a distance D2 in too short a time.

"In 9 View (B) is the explained according to the concept of the invention effect an adjustment of the contact force and thus the normal force apparent - specifically, the normal force is kept comparatively low, so that due to the intersection of the separating with the hybernic curve of the bending force, the distance position D1 to the position D2 has a relatively low excess force, which makes a multiple deduction unlikely.

• 1. sehr kleine Distanz zur Rampe
• 2. geringe Normalkraft

However, a problem in the practical embodiment is a constant adjustment of such a small bearing force (about 0.2 N-0.3 N) since the mechanical friction of the separating mechanism must be included in each case, which may have adverse fluctuations 9 (C) In the meantime, it is considered to be ideal, because if the substrate is unknown, two safety factors against multifeed are at least initially effective:

• 1. very small distance to the ramp
• 2. low normal force

Then only the gradual increase of the normal force takes place until the first movement of the paper, or if not within In a defined time a small increase in distance takes place again with gradual increase in normal force, etc. until the first paper movement.

In 9 (C) Thus, it is explained that an initial combination of reduced normal force with the smallest possible distance to the ramp with incremental increase in normal force followed by incremental increase of the distance to movement of the uppermost substrate is an approach to a separation process which provides the highest level of safety in such a separation system against multiple prints on unknown substrates.

10 FIG. 3 shows a concrete particularly preferred embodiment of a method sequence according to FIG 9 (C) made specifications for the realization of a separation and conveying process with a separation algorithm. In this case, a comparatively good normal force N _ges and a comparatively good distance of the head 20 to the ramp 5 realized, especially for relatively stiff paper. In a first process block 71 timers are set according to the paper and / or environmental conditions - in this case for stiff paper. Will in the steps 73 within the time the timer registers a paper movement, takes place in the steps 75 the fastest possible separation while maintaining the pressure on the ramp 5 , and reducing the normal force up the paper from the exit rollers 6 is detected. If no paper movement is registered, the timer will expire in steps 77 reduced the pressure on the ramp and set a new timer. Otherwise, a distance to the ramp is readjusted, preferably increased and in the steps 78 respectively. 79 a pressure force on the ramp (engine 27 ) or a normal force (engine 69 ) elevated.

In summary, the invention is based on a sheet separation system 10 . 30 based on the frictional separation and conveyance of the uppermost sheet 1 from a pile 3 of sheets, such as papers or flat substrates or like, over a hurdle 5 with the help of a separating and conveying head 20 , which means a feed 7 for the top sheet 1 and wherein the head 20 with a deflection mechanism 17 is actively connected. The concept of the invention provides to improve the feeding behavior that the deflection mechanism 17 for the variably predefinable presetting of a distance of the head 20 is designed to hurdle and the feed means 7 with one to increase the distance of the head 20 to the hurdle 5 drivable frictional role 7 is formed.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - AT 329093 [0002]
• - DE 180096 [0002]
• US 5377969 [0003, 0003]
• - DE 19950307 C1 [0003, 0003]
• US 6866259 B2 [0004, 0004]
• US 6896254 B2 [0004, 0004]
• - DE 102004038753 B3 [0005]
• - DE 102004038971 B3 [0005]
• - DE 102005056634 [0011]

Claims (31)

Sheet separation system ( 10 . 30 ) based on the frictional separation and conveyance of the uppermost sheet ( 1 ) from a stack ( 3 ) of sheets, such as papers or flat substrates or the like, over a hurdle ( 5 ) with the aid of a separating and conveying head ( 20 ), which is an advancing means ( 7 ) for the top sheet ( 1 ), and wherein the head ( 20 ) with a deflection mechanism ( 17 ) is characterized in that the deflection mechanism ( 17 ) for variably presettable presetting of a distance (d1) of the head ( 20 ) to the hurdle ( 5 ) is designed, and the feed means ( 7 ) with an enlargement of the distance of the head ( 20 ) to the hurdle ( 5 ) drivable frictional role ( 9 ) is formed. Sheet separation system ( 10 . 30 ) according to claim 1, characterized in that the deflection mechanism ( 17 ) to a linkage ( 18 . 19 ) is arranged, at the stack-side end of the head ( 20 ) is attached. Sheet separation system ( 10 . 30 ) according to claim 1 or 2, characterized in that a linkage ( 18 . 19 ) is held at a stack remote end, in particular pivotable, in particular on an upper inner side of a housing ( 23 ). Sheet separation system ( 10 . 30 ) according to one of claims 1 to 3, characterized in that a linkage ( 18 . 19 ), a first part ( 24 ) and second part ( 25 ) which are telescopically displaceable relative to each other such that a distance (d1) of the head ( 20 ) to the hurdle ( 5 ) can be preset variably. Sheet separation system ( 10 . 30 ) according to one of claims 1 to 4, characterized by an engine ( 15 . 27 . 69 ) for actuating a linkage ( 18 . 19 ), in particular for telescoping a first part ( 24 ) and second part ( 25 ) of the linkage ( 18 . 19 ) relative to each other. Sheet separation system ( 10 . 30 ) according to one of claims 1 to 5, characterized in that the Auslenkmechnanismus ( 17 ) has a gear transmission, in particular the gear transmission on a second part of a linkage ( 18 . 19 ) mounted rack ( 29 ) and one at a first part ( 24 ) of a linkage ( 18 . 19 ) attached gear ( 31 ), which interact. Sheet separation system ( 30 ) according to one of claims 1 to 5, characterized in that a linkage ( 18 ), a first arm ( 59 ) and second arm ( 61 ), in particular about a common pivot axis ( 21 ) together pivotable arms ( 59 . 61 ), wherein on the first arm ( 59 ) the head ( 20 ), in particular the deflection mechanism ( 17 ) and on the second arm ( 61 ) a pivoting means ( 63 ) is arranged. Sheet separation system ( 30 ) according to one of claims 1 to 7, characterized in that a linkage ( 18 ) on a pivot axis ( 21 ), in particular on a housing ( 23 ) is held. Sheet separation system ( 30 ) according to one of claims 1 to 8, characterized in that a first arm ( 59 ) and a second arm ( 61 ) of a linkage ( 18 ) are arranged rigidly to each other. Sheet separation system ( 30 ) according to one of claims 1 to 9, characterized in that the pivoting means ( 63 ) has a spring. Sheet separation system ( 30 ) according to one of claims 1 to 10, characterized in that the pivoting means ( 63 ) has a gear transmission, in particular the gear transmission one on a second arm ( 61 ) of a linkage ( 18 ) mounted rack ( 65 ) provided with a gear ( 67 ) can work together. Sheet separation system ( 30 ) according to one of claims 1 to 11, characterized in that a motor ( 15 . 27 . 69 ) for driving a gear ( 67 ) provided with one on a second arm ( 61 ) of a linkage ( 18 ) mounted rack ( 65 ) can work together. Sheet separation system ( 10 . 30 ) according to one of claims 1 to 12, characterized in that the deflection mechanism ( 17 ), in particular a first arm ( 59 ) of a linkage ( 18 . 19 ), and the head ( 20 ) are integrated in one unit. Sheet separation system ( 10 . 30 ) according to one of claims 1 to 13, characterized in that a pivoting means ( 63 ) for variably presettable presetting of a bearing force (N _ges ) of the head ( 20 ) on the topmost sheet ( 1 ) is designed. Sheet separation system ( 10 . 30 ) according to one of claims 1 to 14, characterized in that the feed means and / or the deflection mechanism ( 17 ) and / or a pivoting means ( 63 ) is controlled controlled, in particular with a controller ( 39 ) is connected, in particular coordinated with each other are controllable. Sheet separation system ( 10 . 30 ) according to one of claims 1 to 15, characterized in that the feed means ( 7 ) and / or the deflection mechanism ( 17 ) and / or a pivoting means ( 63 ) a drive means, in particular in the form of a Motors ( 15 . 27 . 69 ), having. Sheet separation system ( 10 . 30 ) according to one of claims 1 to 16, characterized in that the feed means ( 7 ) and / or a pivoting means ( 63 ) a wave ( 11 ) and a snail ( 13 ), by means of which a drive means ( 15 ) and a frictional role ( 9 ) or a rack ( 65 ) is operatively connected. Sheet separation system ( 10 . 30 ) according to one of claims 1 to 17, characterized in that the head ( 20 ) is operatively connected to a return means, preferably in the form of a spring, in particular a return means to a deflection mechanism ( 17 ) is attached. Sheet separation system ( 10 . 30 ) according to one of claims 1 to 18, characterized in that a controller ( 39 ) for actuating the feed means ( 7 ) and / or the deflection mechanism ( 17 ) and / or a pivoting means ( 63 ) is designed taking into account a specification and / or evaluation of one or more properties of the uppermost sheet ( 1 ) from a stack ( 3 ) of sheets such as papers or flat substrates or the like. Sheet separation system ( 10 . 30 ) according to one of claims 1 to 19, characterized by a sensor (S1, S2) for recording a distance between hurdles ( 5 ) and head ( 20 ) and / or a sensor (S1, S2) for receiving a movement of the uppermost sheet ( 1 ) and / or a sensor (S3, S4) for receiving a deflection and / or angular orientation of the deflection mechanism ( 17 ) and / or a sensor (S1, S2) for receiving a state of the advancing means ( 7 ) and / or one on the top sheet ( 1 ) running sensor wheel ( 53 ), in particular for absorbing a slip between feed means ( 7 ) and the topmost sheet ( 1 ). Sheet separation system ( 10 . 30 ) according to one of claims 1 to 20, characterized in that a controller with a sensor (S1, S2, S3, S4) for receiving a distance (d1) between hurdles ( 5 ) and head ( 20 ) and / or a sensor (S1, S2, S3, S4) for receiving a movement of the uppermost sheet ( 1 ) and / or a sensor (S1, S2, S3, S4) for receiving a deflection and / or angular orientation of the deflection mechanism ( 17 ) and / or a sensor (S1, S2, S3, S4) for receiving a state of the advancing means ( 7 ) and / or one on the top sheet ( 1 ) running sensor wheel ( 53 ), in particular for absorbing a slip between feed means ( 7 ) and the topmost sheet ( 1 ), is operatively connected. Sheet separation system ( 10 . 30 ) according to one of claims 15 to 21, characterized in that the stack ( 3 ) is supported by a carrier, in particular in the form of a lifting floor. Sheet separation system ( 10 . 30 ) according to one of claims 15 to 22, characterized in that the hurdle ( 5 ) is formed in the form of a ramp. Sheet handling system, in particular sheet separating and / or conveying and / or feeding system, in particular copying, printing, scanning system for papers or thin substrates or single-sheet handling system with a sheet separation system ( 10 . 30 ) according to one of claims 1 to 23. Method for frictionally separating and conveying the uppermost sheet ( 1 ) from a stack of sheets, such as papers or flat substrates or the like, over a hurdle ( 5 ), in particular with a sheet separation system ( 10 . 30 ) according to one of claims 1 to 23, in which the separating and conveying head ( 20 ) via the deflection mechanism ( 17 ) via a feed means ( 7 ) for the top sheet ( 1 ) and causes a Papierseparierung, characterized in that a distance of the head ( 20 ) to the hurdle ( 5 ) variably in addition via the deflection mechanism ( 17 ) and the distance (d1) of the head ( 20 ) to the hurdle ( 5 ) via the feed means ( 7 ) with a drivable frictional role ( 25 ) is increased. A method according to claim 25, characterized in that, in particular in a known sheet, a distance of the head ( 20 ) to the hurdle ( 5 ) and / or a normal force (N ₁ , N ₂ ) on the uppermost sheet ( 1 ) is fixed. A method according to claim 25 or 26, characterized in that, in particular in the case of an unknown sheet, a distance of the head ( 20 ) to the hurdle ( 5 ) and / or a normal force (N ₁ , N ₂ ) on the uppermost sheet ( 1 ) is determined and specified in the context of a separation algorithm. Method according to one of claims 25 to 27, characterized in that detected in a Separier algorithm is whether within a predetermined period of time a separation is done. Method according to one of claims 25 to 28, characterized in that in a separating algorithm a distance between hurdle ( 5 ) and head ( 20 ) and / or a normal force (N ₁ , N ₂ ) on a topmost sheet ( 1 ) is successively changed, in particular increased, if no or only insufficient movement of the uppermost sheet ( 1 ) is detected. Method according to one of claims 25 to 29, characterized in that in a separating algorithm, a deflection mechanism and / or a pivoting means ( 63 ) is operated in a predetermined manner varied. Method according to one of Claims 25 to 30, characterized in that, in the case of sheet feed operations following a first sheet feed operation, a distance (d1) to the hurdle ( 5 ) is increased until an acceptable ratio of paper speed to the feed rate of the head ( 20 ), in particular peripheral speed of the frictional role ( 7 ) is reached.