EP0357948B1 - Paper folding machine - Google Patents

Abstract

The paper folding machine is provided with a roller pair (T1,T2) which forms an intake zone (E) and determines the velocity of feed of the material to be folded, and with at least one pair of folding rollers (W1,W2,W3), which forms a folding zone (F1) and is parallel to the former pair of rollers. A stopless feed limiting device, which determines the actual folding length and can be actuated individually for each folding operation by a microprocessor and/or an electronic control circuit as a function of a feed measuring unit, is arranged in a material feed path (4) which extends past the folding zone (F1,F2). In order to reach narrow folding length tolerances even at high working speeds, on the side of the maerial feed path (4) opposite the folding zone (F1,F2), the feed limiting device is provided with a knife-like or bar-like deflecting member (6), which extends over the width of the material feed path and can be moved toward the folding zone (F1,F2) at a velocity corresponding to the velocity of feed of the material to be folded, while the material to be folded is deflected to form a fold.

Description

The invention relates to a paper folding machine with a pair of rollers forming a draw-in point and with at least one pair of fold rollers forming a fold point running parallel thereto, in which a stop-free advance limiting device which determines the respective fold length and which is arranged by a microprocessor and / or an electronic control device, depending on a flow measuring device, can be actuated individually for each folding process.

In a known upset folding machine (DE-PS 27 57 182), viewed in the transport direction of the folded material, a folded material guide is arranged in front of or behind a pair of folding rollers. For the preselectable, length-appropriate interruption of the folding material feed and for the fold-forming deflection of the folding material, flow restrictors acting in a frictional manner on the folding material, locking the leading folding material section and / or driving in the opposite direction, are provided in the form of clamping elements or pressure rollers, the pressure rollers respectively providing the leading folding material Press the folding roller lying near the entrance to the guide for folding goods. The flow limiter is actuated by sensors which are located in the flow lanes in front of everyone Fold roller pair are arranged and scan the leading edge of the folded material. The flow limiter is actuated by electromagnets, for the control of which is the correct length, an electronic pulse generator synchronized with the folding rollers is provided. In the area of the upsetting space there are fixed folded goods sensors which scan the respective leading folded goods sections. The pulses of the pulse generator are supplied as counting pulses to a presettable coincidence circuit, depending on the switching state or the switching states of the folded goods sensors, which, when the number of pulses coincides with the preset number, actuates the advance limiter and at the same time deletes the counting pulses in the coincidence circuit. In this and also in other known upset folding machines (DE-PS 673 172) are provided as a flow limiter in the runways instead of the otherwise customary adjustable paper stops based on clamping or friction braking or stopping devices, which hold the respective advance sections of the folded material and Prevent further advance by electromagnetically actuating the folded material either frictionally against a stationary surface or against the circumferential outer surface of a folding roller, so as to cause the formation of folds or the supply of the folded material to the subsequent folding point.

Since the effectiveness of these known flow limiters is based on the creation of a frictional connection between the folded material and a braking or counter-rotating drive element, the work result, particularly at high working speeds, is unsatisfactory with regard to the folded length tolerances.

The invention has for its object to provide a paper folding machine of the generic type with a flow limiting device, which ensures lower fold length tolerances even at high speeds.

This object is achieved according to the invention in that the advance limiting device has a knife-like or rod-shaped deflecting element which is arranged on the side of the folded material advance path which is opposite the fold point and which extends over its width and which at a speed corresponding to the fold material advance with simultaneous fold-forming deflection of the folded material to the folded point is movable.
Above all, it is important that the deflecting member is moved towards the fold at such a speed that after hitting the surface of the material to be folded it remains on the same point of the material to be folded during the further movement sequence and exactly the line of the material to be folded, along which it first struck on this, leads into the fold, so that the fold is formed along this line. This also ensures that there is no longer any relative movement between the folded material and the deflecting element during this deflecting movement, which ensures that the same high folding length accuracy is maintained at every working speed.

There are several options for the drive and also for the movement path of the deflection element. Three preferred options are given in claims 2 to 12.
Whether the deflection movements of the various deflection elements take place exactly synchronously with the rotary movement of the folding rollers, i.e. either with the same angular speed or with the same peripheral speed, is only of importance insofar as it must be ensured that the deflection element is at the same point during the deflection process of the folding material Folded goods remain and the folded goods do not move relative to the deflecting element during this deflecting movement, neither in the forward nor in the reverse direction.

Another advantage which is achieved by the type of deflection of the folding material according to the invention towards the respective folding point is that the working noise is considerably reduced.
Due to the positively guided deflection of the folded material by means of a deflecting member, the otherwise inevitable and unavoidable bang noises that are common in upsetting folding machines, which are caused by the suddenly changing Shear and tensile stresses on the paper arise, are greatly reduced or reduced to a minimum.

In particular with the embodiments of claims 3 to 10, high working speeds are readily possible.

When using a control curve as a drive for the deflecting element, there is the possibility of precisely coordinating the movement sequence during the deflecting process with the paper advance even if the pivoting movement of the deflecting element is directed in its initial region against the direction of advance of the paper. This means that there is also the possibility of storing the e.g. to arrange the second folding point associated deflection element in the forward direction behind the second folding point, which in turn gives the possibility of forming the two folding points with only three folding rollers which are arranged in the corners of a right-angled, preferably isosceles triangle.

In the embodiment of the invention according to claims 4 to 10 and also in the embodiment of the invention according to claim 11, there is the advantage that the deflecting elements execute their folding-material deflecting movements exactly in synchronization with the rotary movements of the folding rollers, on the axes of which they are mounted coaxially. This creates a very high level of work accuracy with regard to the fold length tolerances. In one case, however, there are additional return drives for the deflection members and in the other case there is a fourth folding roller required to form the second fold point.

• Fig. 1 in schematischer Darstellung eine Seitenansicht der Papierfalzmaschine;
• Fig. 2 einen Schnitt II-II aus Fig. 1;
• Fig. 3 eine Ansicht III aus Fig. 2;
• Fig. 4 in schematischer Darstellung die Seitenansicht einer anderen Papierfalzmaschine;
• Fig. 5 einen Schnitt V-V aus Fig. 4;
• Fig. 6 einen Schnitt VI-VI aus Fig. 4;
• Fig. 7 in vereinfachter schematischer Darstellung eine Variante der Papierfalzmaschine der Fig. 4 in der Ausgangsposition eines anderen Auslenkorganes;
• Fig. 8 die Ausführunsform der Fig. 7 in der Auslenkposition des Auslenkorganes;
• Fig. 9 eine weitere Variante der Papierfalzmaschine der Fig. 4 in der Ausgangslage des Auslenkorgans;
• Fig. 10 die Ausführungsform der Fig. 9 in der Auslenkposition des Auslenkorganes;
• Fig. 11 in vereinfachter schematischer Seitenansicht eine weitere Papierfalzmaschine und
• Fig. 12 einen Schnitt XII-XII aus Fig. 11.

Several exemplary embodiments of the invention are explained in more detail below with reference to the drawing. It shows:

• Figure 1 is a schematic representation of a side view of the paper folding machine.
• FIG. 2 shows a section II-II from FIG. 1;
• Fig. 3 is a view III of Fig. 2;
• 4 shows a schematic illustration of the side view of another paper folding machine;
• FIG. 5 shows a section VV from FIG. 4;
• FIG. 6 shows a section VI-VI from FIG. 4;
• FIG. 7 in a simplified schematic representation a variant of the paper folding machine of FIG. 4 in the starting position of another deflection element;
• 8 shows the embodiment of FIG. 7 in the deflected position of the deflecting member;
• FIG. 9 shows a further variant of the paper folding machine of FIG. 4 in the starting position of the deflecting member;
• 10 shows the embodiment of FIG. 9 in the deflected position of the deflecting member;
• Fig. 11 in a simplified schematic side view of another paper folding machine and
• 12 shows a section XII-XII from FIG. 11.

In the paper folding machine shown in FIGS. 1 to 3 in a frame 2 consisting of two plates 1 three folding rollers W1, W2 and W3 arranged so that their axes A1, A2 and A3 lie in the corners of a right-angled, isosceles triangle or in a horizontal plane E1 and a vertical plane E2 and that they in pairs form a first fold point F1 and a second fold point F2 when touching the lateral surfaces of the folding rollers W1, W2, W3. For the supply of the folded material, two transport rollers or rollers T1 and T2 form a feed point E. In the direction of passage behind the last folding point F2, two further transport roller or transport rollers T3 and T4 are arranged, which together form an output point A through which the folded material passes the folding machine leaves again.
The feed point E is arranged in such a way that the incoming folding material passes approximately tangentially via the first folding roller W1 past the first folding point F1 onto a paper guide 3, which in the present case lies in the same horizontal plane as the feeding point E, so that it is together with it forms the leading path 4, indicated by a dash-dotted line and passing the first fold point F1. Immediately behind the feed point E there are further paper guides 5 which guide the folded material in the advance path.

On the side of the advance path 4 opposite the folding point F1, a knife-like deflection element 6, which extends over the entire length of the folding point 1 or the folding rollers W1 and W2, is arranged, each of which is attached to two-armed pivot levers 7. These swivel levers 7 are in turn on a common one Shaft 8 rotatably arranged so that they are axially outside the two end faces of the folding roller W1 and can thus be pivoted past this. The shaft 8 is mounted eccentrically to the axis A1 of the folding roller W1 below the advance path 4 between the folding roller W1 and the feed point E in the frame 2. For pivoting the pivot lever 7, a cam plate 10 is provided which is mounted on a shaft 9 mounted below the folding roller W1 and which can be brought into a geared connection with the folding roller W1 at times via a single-speed clutch 14, for example via a wrap spring clutch, and via gears 15 and 16. A sensing roller 11 of a second lever arm 12 of the pivoting lever 7 bears against the lateral surface of this cam plate 10, on which a tension spring 13 acts in the corresponding direction.

The respective engagement of the one-way clutch 14 takes place by means of a pawl 17, which is actuated by an electromagnet 18 and, in its rest position, engages in a locking manner under a locking shoulder 19 of a control ring 20 of the one-way clutch 14. If the electromagnet 18 is briefly energized, the pawl 17 releases the control ring 20 for one revolution of the shaft 9 with the cam plate 10. The timely excitation of the electromagnet 18 is controlled by an already known in principle electronic control device or with the aid of a microprocessor as a function of a flow measuring device, also not shown here.

A deflection element 6 'is also for the second fold point F2. provided that is on the fold point F2 opposite side of the second leader 4 '. This lead path 4 'closes in the vertical direction tangential to the folding roller W3 to the folding point F1. This deflector 6 'is in the same manner as the deflector 6 knife-shaped and attached to two pivot levers 7' of the common shaft 8 ', which is also from a cam 10' via a single-speed clutch 14 and a feeler roller 11 'against the action of a tension spring 13 be operated.
A paper guide 21 is arranged between the folding point F2 and the output point A.

The operation of this paper folding machine is essentially as follows:
The folded material arriving through the feed point E in the advance path 4 is scanned by means of sensors (not shown) which, for example, measure the lead length with the aid of a counting device, continuously enter the measurement result in an electronic coincidence circuit in which a predetermined value is stored depending on the type of fold and the format length. In the event of coincidence, the electromagnet 18 of the first single-speed clutch 14 driving the cam plate 10 is briefly excited, so that the cam plate 10 rotates through 360 ° and thereby causes a pivoting movement of the pivoting lever 7 and at the same time a deflecting movement of the deflecting element 6 towards the folding point F1. As a result of this deflection movement of the deflection element 6, the folding material moving in the advance path 4 also becomes Fold point F1 deflected so far that it can be detected by the two folding rollers W1 and W2 to form the fold point F1 and can be transported into the advance path 4 '. Also the second cam 10 ', which the second deflection member 6' is actuated by an electronic control in dependence on a flow meter 4 'located in the advance path via the second single-speed clutch 14 in such a way that the deflection element 6' which is in the second advance path 4 'located fold material is measured in the correct length at the correct point and deflects towards the fold point F2, where the second fold formation then takes place. The folded folded material is then ejected via the paper guide 21 by the two transport rollers T3 and T4.
By synchronous operation of the two cams 10 and 10 'with the drive of the folding rollers W1, W2 and W3 and by the shape of the cams 10 and 10', the deflection movements of the deflection elements 6 and 6 'are controlled in terms of speed so that they rest on the folded material Edges of the deflection elements 6 and 6 'do not change their position on the folded material during the deflection movement, ie the deflection movements of the deflection elements 6 and 6' are matched to the forward speed of the folded material. The thus controlled deflection movements of the deflection elements 6, 6 'cause, as soon as they have gripped the folded material, that no further advance takes place.

In the embodiment of FIGS. 4 and 5, the two folding points F1 and F2 are formed by three folding rollers W1, W2 and W3, which are mounted together in the horizontal plane E1. It is from the indicated direction of rotation arrows of these folding rollers W1 to W3 recognizable that the folded material passes through the first folding point F1 from top to bottom and the second folding point from bottom to top. Again, the two transport rollers or rollers T1 and T2 are present, which form the feed point E and paper guides 5, through which the incoming folded material tangentially to the roller W1 in the horizontal direction across the fold point F1 onto an obliquely upward paper guide 3 ' running. The first lead path 4 thus runs essentially the same as in the exemplary embodiment in FIG. 1.
In the direction of passage behind the first fold point F1 there is a diversion web 22 which conveys the incoming material in the vertical direction around the middle folding roller W2 into a horizontal, through a pocket-like, but non-stop paper guide 23 certain leading path 4 ', which, like the leading path 4 a dash-dotted line is indicated.

For deflecting the folded material from the advance path 4, a thin rod-shaped or wire-shaped deflection element 25 is fastened at a small radial distance from the folding roller W1 on two on the two end faces of the folding roller W1 coaxially mounted to this segment-like pivoting lever 24, which axis-parallel to the folding roller W1 runs and, due to its radial distance from the folding roller W1, is at the same time on the side of the advance path 4 opposite the first folding point F1. Through the two paper guides 5 and 3 ', the leading path 4 is namely set so that it in the starting or rest position shown in Fig. 4 Swivel lever 24 passes between the lateral surface of the folding roller W1 and the deflection member 25.
The pivot levers 24 are each under the influence of tension springs 26, which exert a torque in the direction of rotation of the folding roller W1 on the pivot levers and thus also on the deflection member 25. At the same time, however, the pivot levers 24 are locked in an electrically releasable manner in their initial position shown in FIG. 4, specifically by means of a pawl 27 which can be actuated by an electromagnet 28 in the sense of unlocking. So that after unlocking the swivel levers 24 they do not move faster than the folding roller W1, but synchronously with them, one-way clutches 29 are arranged between the swivel levers 24 and the shaft 58 of the folding roller W1. This one-way clutches 29 allow a free pivoting movement of the locking lever 24 against the direction of rotation of the folding roller W1, but prevent the pivoting lever 24 from moving faster in the direction of rotation of the folding roller W1 than this itself. This is a synchronous operation between the folding roller W1 and the deflection member 25 or the swivel levers 24 in the deflection direction, ie towards the fold point F1, are guaranteed.
This pivoting movement of the pivoting lever 24 is limited by a possibly adjustable stop 30. This stop 30 is set or arranged such that the deflection member 25, when it is moved with the loop-like deflection of the sheet of sheet below it, only so far in the direction of rotation of the folding roller W1 can that it itself does not get into the folding point F1, but on the other hand the folded material is so close to the Folding point F1 deflects that the folded material is gripped by the two folding rollers W1 and W2 forming the folding point F1 to form the fold and is conveyed through the folding point F1. As soon as the pivot levers 24 have reached the deflection position shown in dash-dotted lines in FIG. 4, a return drive comes into action, which pivots the two pivot levers 24 back into their starting position, in which they are then locked again by the pawl 27 until through the Electromagnet 28 the next deflection is released. This return drive consists of a friction roller 31 which is rotatably fastened to a two-armed lever 32 and can be pressed against a segment arc 33 of a pivoting lever 24 which runs concentrically to the axis A1 of the folding roller W1. The lever 32 is pivotally arranged on a shaft 34 mounted eccentrically to the folding roller W1 in the frame 2 and can be pivoted by an electromagnet 35, the armature 36 of which engages on the lever arm opposite the friction roller 31. On this shaft 34 there is a gear 37 which is fixed in terms of rotation and which engages with a gear 38 fastened on the shaft 58 of the folding roller W1. The shaft 34 is thus continuously driven in the opposite direction by the folding roller W1. There is also a friction wheel 39 on the shaft 34, which continuously drives the friction roller 31.
When the electromagnet 35 is energized in the deflection end position of the pivot lever 24, it pulls the friction roller 31 against the segment bow 33 of the pivot lever 24, so that it is then turned back into its starting position. As soon as he has reached this starting position and through the pawl 27th is locked, the electromagnet 35 is switched off and the friction roller 31 is again lifted off the segment bow 33 of the pivot lever 24 by correspondingly pivoting the lever 32 by means of a return spring (not shown).

The folding roller W2 is also equipped with the same deflection device as the folding roller W1. The only difference is that the arrangement of the deflecting device of the folding roller W2 is arranged upside down with respect to that of the folding roller W1. The return drive for the two swivel levers 24 with the deflection member 25 is also constructed exactly the same as that of the swivel lever 24 of the folding roller W1.

If now in the folding point F1 folded folded material in the leading path 4 'between the folding roller W2 and the deflection member 25 has advanced through the predetermined folding length, the electromagnet 28 is excited by a corresponding pulse from an electronic measuring and control device, so that the Pawl 27 releases the pivot lever 24 with the deflecting member 25 and causes them to deflect the folded material towards the folding point F2 in synchronism with the roller W2.

Behind the folding point F2 there is a diverting web 40 which deflects the folding material arriving from the folding point F2 under pressure rollers 41 via a paper guide 42 to the output point A of the transport rollers or rollers T3 and T4. The deflection device of the folding roller W2 has the same parts as that Deflection device of the folding roller W1 and it also works in the same way. For this reason, the corresponding parts are provided with the same reference numbers.

7 and 8, as well as 9 and 10, two variants of the paper folding machine shown in FIGS. 4 to 6 are shown schematically, in which 25/1 as a deflecting member on the pivot levers present in the same way as in the embodiment of FIGS. 4 to 6 24 instead of a rod-shaped or wire-shaped element, a rotatably mounted roller 25/1 or a cylindrical round rod is provided.

In the variant of FIGS. 7 and 8, the arrangement of the deflecting member 25/1, which is designed as a freely rotatable roller or round rod, is such that it has a radial distance from the lateral surface of the folding roller W1 and the incoming folded material in the advance path 4 is free between them can run through both parts. The deflection movement of the pivot lever 24 with the deflection member 25/1 takes place so far in this case that the deflection member 25/1, as shown in FIG. 8, presses the folded material against the lateral surface of the folding roller W2, so that at the point of impact 43 a friction drive between the folded material and the folding roller W2 to the folding point F1 comes about. This can be an advantage, especially with thick or stiffer types of paper. The same advantage can also be achieved with the variant shown in FIGS. 9 and 10, in which the deflection member 25/1, which likewise consists of a rotatable roller, is mounted in the pivoting levers 24 in such a way that it is connected with the lateral surface of the folding roller W1 is in frictional connection and the folding material entering the advance path 4 is already brought into frictional connection with the folding roller W1 in the starting position of the pivoting lever 24. This frictional connection is also maintained when the deflection movement to the folding point F1 takes place, so that here, too, an additional advance of the folded material to the folding point F1 takes place when the deflection movement of the pivoting lever 24 or the deflection element 25/1 has come to a standstill.
As a result of the free rotation of the deflecting member 25/1, the return movement to its starting position is not hindered.

The deflection element of the folding roller W2 can also be designed and arranged accordingly.

The very simplified exemplary embodiments of FIGS. 7 and 8 or 9 and 10 otherwise correspond to the exemplary embodiment of FIGS. 4 to 6, wherein for the embodiment of FIGS. 9 and 10 also fixed or adjustable stops 30 for the swivel levers 24 are also used Limitation of the deflection movement can be provided.

It can already be seen from FIG. 4 that in this embodiment only three folding rollers W1, W2 and W3 are required to form two successive folds, but in a different arrangement than in the embodiment of FIG. 1.

11 and 12 a further embodiment of the paper folding machine according to the invention is shown schematically in a highly simplified manner, in which four folding rollers W1, W2, W3 and W4 are provided to form the two folding points F1 and F2, the folding rollers W1 and W2 being the folding point F1 and the folding rollers W3 and W4 form the folding point F2. While the folding rollers W1 and W2 are arranged in a horizontal plane E1, the folding rollers W3 and W4 are in a horizontal plane E3 arranged below. The arrangement is such that there is a distance between the folding roller W2 and the folding roller W3, through which the second leading path 4 'is passed. From the feed point E, which is formed by the two transport rollers T1 and T2 or by corresponding transport rollers, the leading path 4, which is indicated in a dash-dotted line, is determined by the paper guides 5 and 3, while the second leading path 4 'by one Paper guide 3 'above the fourth folding roller W4 and a diverting web 43 arranged between the folding point F1 and the third folding roller W3 is determined.
The folding rollers W1 and W3 arranged in front of the folding point F1 and F2, respectively, are each provided with five thin rod-shaped or wire-shaped deflection members 25, which are attached to star-shaped holders 44 in an axis-parallel manner to the folding rollers W1 and W3 so that they each have the same angular distances of 72 ° from each other and each have the same radial distances from the outer surface of the folding roller W1 or W3, so that the folded material is unimpeded between the folding roller W1 or W3 and the just above the leader 4 or 4 'located deflection member 25 can pass through.

As can be seen from FIG. 11, the holders 44 consist of five-armed disks and are each end-mounted coaxially with the folding rollers W1 and W3 on their shafts 45 and 46, respectively. By stepping clutches 47, these holders 44 can be individually coupled to the shafts 45 and 46, respectively, for a movement step of 72 °. These stepping clutches can be designed, for example, as so-called wrap spring clutches, each of which has a control ring 48. This control ring 48 is provided on its circumference 5 with five radial recesses 49, each offset by 72 ° from one another, each of which has a radial locking shoulder 50. With these locking shoulders 50 or recesses 49, a locking pawl 51 engages, which is on the one hand under the influence of a tension spring 52 and on the other hand an electromagnet 53. While the tension spring 52 pulls the pawl 51 into engagement with one of the recesses 49, the electromagnet 53, when briefly excited to trigger a deflection movement of the folded material, releases the control ring 48 by deflecting the pawl 51 so that it comes out of engagement with the locking shoulder 50 in the radial direction. As a result of the rotary movement which then begins immediately, the control ring 48 is released together with the holder 44 for a switching step of 72 °. Since the pawl 51 is only briefly deflected by the electromagnet 53, it falls into the next recess 49 of the control ring 48 and thus stops the control ring 48 and the holder 44 again until the Electromagnet 53 receives the next deflection pulse.
1 to 10, the deflecting members must each be returned to their starting position by a backward movement, the deflecting member 25 which has come to a standstill immediately before the folding point F1 or F2 passes through the folding point F1 or F2. The arrangement is such that, after each switching step or a folding operation, a deflecting member 25 comes to a standstill in the position shown in FIG. 11 immediately above the advance path 4 or 4 'and the advance of the folded material in each case between the latter in the starting position located deflector 25 and the folding roller W1 or. W3 can run through. Here, too, the advance of the folded material is measured in both advance paths 4 and 4 'by an electronic measuring device. When a predetermined lead value is reached, which corresponds to the desired fold length, the electromagnet 53 receives a corresponding deflection pulse.

When the material to be folded has then also passed through the second fold point F2 in the manner described to form the second fold, it arrives at the output point A of the transport rollers T3 and T4 via a second diverting web 54 and a further paper guide 55.

The folding rollers W2 and W4 can each so that the deflection members 25 can also easily pass the folding points F1 and F2 be provided with an elastic jacket and / or be radially elastically supported with respect to the associated folding roller W1 or W3.

Claims (12)

1. Paper folding machine with a pair of rollers (T1, T2) forming a draw-in station (E) and with at least one pair of folding rollers (W1, W2) forming a folding station (F1) extending parallel thereto, wherein, in a folding material forward motion track (4, 4′) passing along the folding station (F1) an impact-less forward motion limiting device determining the respective folding length is mounted, and wherein, on the side of the folding material forward motion track (4, 4′) opposite the folding station (F1) a guide device moving against the folding station (E) is mounted for the folding of the sheets, characterized in that the forward motion limiting device consists exclusively in a blade-like or rod-shaped deflecting member (6, 6′, 25, 25/1) extending over the width of the folding station (F1, F2) which is individually actuatable for each folding process by a driving device controlled by a microprocessor and/or by an electronic control device depending upon a forward-motion measuring device, so that, at a speed corresponding to the forward motion of the folding material, it deflects the folding material as far as into the folding station (F1, F2) while simultaneously producing the folding.
2. Paper folding machine according to claim 1, characterized in that the deflecting member (6, 6′) is driven by a radial cam (10, 10′) which can be connected with the roller drive by means of an electromagnetically engageable one-stop clutch (14).
3. Paper folding machine according to claim 2, characterized in that the blade-like deflecting member (6, 6′) is secured to two pivoting levers (7, 7′) which are secured on a common shaft (8, 8′) mounted eccentrically to a folding roller.
4. Paper folding machine according to claim 1, characterized in that the deflecting member (25, 25/1) is secured to two pivoting levers (24) mounted respectively on a front side of a folding roller (W1, W2) concentrically with the said folding roller (W1, W2), the pivoting levers being electrically detachably locked in a starting position, being in addition under the influence of a spring torque acting in the direction of rotation of the folding roller (W1, W2), and being able, by means of an electromagnetically engageable resetting drive, to be returned to their starting position after each deflection process.
5. Paper folding machine according to claim 4, characterized in that the pivoting levers (24), by means of stepless overriding clutches (29) engaging in the deflection direction, can be brought in synchronous rotary connection with the folding roller (W1, W2).
6. Paper folding machine according to claim 5, characterized in that an electromagnetically engageable tooth gearing or friction gear (31, 33) is provided as resetting drive.
7. Paper folding machine according to claim 6, characterized in that, for the locking of the pivoting levers (24) in the starting position, electromagnetically deflectable locking elements , such as catches (27), are provided.
8. Paper folding machine according to one of claims 1 to 7, characterized in that the deflection member is constructed as a round bar or roller (25/1) and is rotatably mounted in the pivoting levers (24), and in that the deflecting member (25/1) on each deflection process is moved to such an extent that it presses the folding material against the shell surface of the folding roller (W2, W3) respectively situated on the other side of the folding station (F1, F2).
9. Paper folding machine according to claim 8, characterized in that the pivoting levers (24) are mounted coaxially with the folding roller (W1, W2) situated in the forward motion direction in front of the respectively next folding station (F1, F2), and in that the deflecting member (25/1) is at a radial distance from the shell surface of this folding roller (W1, W2).
10. Paper folding machine according to one of claims 1 or 4 to 8, characterized in that the deflecting member designed as round bar or roller (25/1), rotatably mounted in the two pivoting levers (24) pivotable around the axis (A1, A2) of a folding roller (W1, W2), is in radially elastic contact with the shell surface of this folding roller (W1, W2).
11. Paper folding machine according to claim 1, characterized in that, at a small radial distance from the shell surface of a folding roller (W1, W2), on two plate, ring or star-shaped holders (44), the coupling means rotatably mounted on the two front sides of the folding roller (W1, W2) and coaxially therewith, and electromagnetically connectable and disconnectable, can be brought into rotary connection with the folding roller (W1, W3) for switching steps of 72° effected in the same direction.
12. Paper folding machine according to claim 11, characterized in that, of the folding rollers (W1, W2) forming in each instance pairwise a folding station (F1, F2), at least one is provided with an elastic shell surface and/or is radially elastically mounted.

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