EP0870714B1 - Blade folding machine, method to transversely fold sheets with blade folding machine and line for jobbing work with a blade folding machine - Google Patents

Description

The invention relates to a sword folding machine for cross folding of sheets fed individually by a device, with a arranged transversely to the feed direction of the sheets, in opposite directions rotating pair of folding rollers and one of the supplied Bow deflecting between the pair of folding rollers, for example sword driven in tact.

The person skilled in the art has various options for folding printed products Folding machine types available. One of them is the knife folding machine, also called sword folding machine, for the Folding process, for example a vertically movable sword and has two counter-rotating rollers. The sheets to be folded are individually one after the other with a transport device conveyed over the pair of folding rollers and with the vertically descending Sword struck between the rotating folding rollers. The folded fold is then from the folding shafts detected and when passing through the sheet through these folding rollers a fold break occurs.

Folding machines are also known in which the folding by a rotatable sword is made, which is also on the circumference of one rotatable sword bearer is arranged. The movement of the Schwertes is controlled, for example, via a gear wheel that sits on the axis around which the sword rotates is. Several swords can be arranged on the sword carrier his. Such sword carriers are in particular as sword fold cylinders known.

Folding machines with rotating swords are produced per revolution of the sword bearer a number of folds, which the Number of swords corresponds. Do sheets have to be folded which are smaller than the pitch of the folding cylinder these sheets are pulled apart as far as they are fed to the folding rollers, that the division of the folding cylinder is reached becomes. However, pulling the sheets apart is unnecessary high and problematic processing speeds and a precise alignment of the sheets to ensure high folding accuracy to reach. This alignment on stops is difficult and complex and limits the speed and thus the performance the folding machine.

DE 31 20 527 A is a device for setting the cycle time of folding knives at which the gear ratio is known between the drive of the folding machine or their funding for sheet feeding and driving the Folding knife should be regulated so that any belt paths exactly one complete work cycle for the funding of the folding knife is assigned. DE 31 20 527 provides for this A before that a continuously variable transmission between the drive the conveyor of the folding machine and drive of the folding knife with an actuator of two sensors of a measuring and Control arrangement is connected to the length of the belt path on the conveyor and the measure of the angle of rotation on the drive shaft of the folding knife. Through a target-actual comparison circuit if there is a mismatch with a preselected setpoint by output signals a control part of a Actuator controlled until there is a match of the comparison variables by changing the gear ratio is achieved.

A device according to DE 31 20 526 A differs from DE 31 20 527 A in that for setting an optimal Folding process the speed of the feed belts changing device and a folding knife cycle number changing device connected to one or more computers are.

DE 43 35 049 describes a so-called angle folding machine a so-called longitudinal fold in a booklet, the application in a rotary printing press, in particular is provided following a folding machine. The additional extending in the feed direction of the booklet Fold is generated by a so-called angled folding sheet, which is attached to two spaced pivots are suspended, each with connected to a swing arm rotating about a central axis are so that the swing arms mounted on central shafts or the angled folding sheet one acting in the vertical direction Exercise float.

The invention has for its object to a folding machine create, which avoids the difficulties mentioned.

The task is therefore with a folding machine of the same type solved that the speed of the sword within a folding cycle for the production of different formats the folded sheet can be changed relative to the speed of the sheets is and that the sheets are folded in the barrel and without a stop become.

In the sword folding machine according to the invention, the Adaptation to different sheet formats through a change the speed of the sword movement. At the transition a smaller format becomes the size reduction the speed of the sword movement increases. The adjustment of the speed when changing the format is very flexible and limited, in particular by means of a servo motor no artificial pulling apart of the bow. The invention enables a higher folding accuracy and at the same time one higher performance, especially for formats smaller than that Are maximum format. It is also essential that the sheets in the can be folded freely and without a stop.

The folding accuracy can be increased even further if after In a further development of the invention, the sword fold movement is controlled in this way or is regulated that the speed too changes during a folding cycle. Preferably the speed regulated or controlled so that before and after the folding moment the speed of the sword is slightly higher than that average speed of movement and that at the folding moment the Speed is lower than the average speed. The integral over the speed difference between the medium speed and effective speed over a full cycle, of course, must be zero his.

According to a development of the invention within a Folding cycle not only the sword movement, but also the Transport speed of the sheets to be folded controlled or regulated, especially in the area in which the Sword immerses, the sword movement and the movement of the bow matched even more precisely and thus the folding accuracy and performance while protecting the bow be further increased.

The irregular movement of machine parts can, however lead to significant vibrations. But now, for example on the shaft of the sword bearer an accelerable in the opposite direction Compensating mass arranged, so the above Overall speed changes nonetheless low-vibration carry out. The principle of leveling compounds is for all types of construction of limping movements, i.e. also for all types of sword folding machines applicable e.g. over a gearing with a swivel lever that is fed in a revolving curve is rotated in the opposite direction relative to the folding cylinder can. The control curve can be fixed in the room or for one Dynamic limping cyclically in the axial direction of the sword folding cylinder be moved. The skilled person is different Types of construction of such balancing compounds are known.

The sword folding machine according to the invention is particularly advantageous in a commercial processing line in the direction of transport seen in front of the sword folding machine at least one Printing unit and a cross cutter.

With the known commercial processing lines, the format is variable very limited. In the case of a commercial processing line according to the invention can in without expensive conversion work one work cycle commercial products with different formats be finished. Such an operation can except printing, folding and cutting also other work steps, especially perforating, punching, gluing, but also include inkjet lettering or numbering. commercial products, which are known to be very diverse, especially what the format, the printing and the folding can be done with higher performance than previously processed.

Fig. 1

schematisch eine Ansicht der erfindungsgemässen Schwertfalzmaschine,

Fig. 2

eine Ansicht in Richtung des Pfeils I der Figur 1,

Fig. 3

schematisch eine Ansicht einer Variante der erfindungsgemässen Maschine,

Fig. 4

schematisch eine Ansicht einer weiteren Variante der erfindungsgemässen Maschine,

Fig. 5

schematisch einen Schnitt durch eine erfindungsgemässe Maschine mit einer Ausgleichsmasse,

Fig. 6

eine Ansicht der Maschine gemäss Pfeil VI der Figur 5, und

Fig. 7

eine schematische Ansicht einer Akzidenzverarbeitungslinie.

An embodiment of the invention is explained below with reference to the drawings. Show it:

Fig. 1

schematically a view of the sword folding machine according to the invention,

Fig. 2

2 shows a view in the direction of arrow I in FIG. 1,

Fig. 3

schematically a view of a variant of the machine according to the invention,

Fig. 4

schematically a view of a further variant of the machine according to the invention,

Fig. 5

schematically a section through a machine according to the invention with a balancing mass,

Fig. 6

a view of the machine according to arrow VI of Figure 5, and

Fig. 7

is a schematic view of a commercial processing line.

FIG. 1 shows a sword holder 1 with two swords 2, which are rotatably mounted on the sword carrier 1 in a manner known per se are. The sword carrier 1 is about the axis of rotation 5 in Direction of arrow 3 with a servo motor, not shown here driven counterclockwise. Turn the two swords 2 when rotating the sword carrier 1 in the direction of arrow 4 in Clockwise, with a front edge 2a dotted on the dot-dash line drawn curve 18 moves. The sword carrier 1 can but also as a sword fold cylinder with more than two swords 2 be formed.

Below the sword bearer 1 are only hinted at here shown machine frame 19 two opposite directions Folding rollers 11 mounted, which are pressed against each other with compression springs 12 become. The two rollers 11 and the sword carrier 1 are set up so that one in the 6 o'clock position Sword 2 as shown in Figure 1 in the inlet gap between the two folding rollers 11 are immersed. One over the two Folding rollers 11 located sheet 7 is due to the declining Sword 2 between the counter-rotating rollers 11 taken. The sheet 7 is in this case from the folding rollers 11 detected so that when the sheet 7 passes through the folding rollers 11 a fold 8 arises in the sheet. The principle of this fold is known to the person skilled in the art.

The sheet 7 is fed to the two folding rollers 11 with a double band 10 in the direction of arrow 13. Further, Sheet 7, not shown here, are individually and in a row transported one after the other. In Figure 1, the arc 7 thus follow in series from the left further sheets not shown here, the are captured by the double belt 10 one after the other.

The embodiment according to FIG. 2 corresponds to that according to FIG 1, with only one sword 2 on each sword carrier 1 is arranged. As this figure shows, the sword bearer is 1 mounted on a shaft 14 on a frame-shaped machine frame 19 is mounted and the one not shown here Servomotor is rotatable on a drive wheel 17. The Sword 2 is used to generate a superimposed rotary motion a toothed belt 20 connected to a sun gear 21, which is in the machine frame 19 is stored. For example, a cyclical one Movement of the sun gear 21 can be the rotational movement of the Sword 2 can be influenced. Shown here only in a hint Plates 22 serve to support the two folding rollers 11. The servo motor 17 alone enables the rotational speed of the Sword bearer 1 to change, but only without mass balance for light versions without major vibrations likely. Suitable types of construction are known to those skilled in the art Leveling compounds related to the idea of the boxer engine, known, The speed of rotation of the sword carrier 1 can be within of a folding cycle, depending on the version or operating mode be or change.

The speed of rotation of the sword bearer 1 depends on the format the bow 7 adjusted. If the sheet format is changed adjusted accordingly the speed of rotation of the sword carrier 1. When moving to a smaller sheet format, the speed of rotation of the sword carrier 1 increased. It is with it not necessary when moving to a smaller format accordingly in a row of sheets 7 arranged one behind the other pull apart and align.

The speed of rotation of the sword carrier is preferably 1 controlled or regulated by means of the servo motor so that its Rotation speed changes during one revolution. In order to it is possible to fold different formats. Even with one Format changes can be made on the edge 2a of the sword 2 optimal relationships between the speed of the bow 7 and that of the active edge 2a.

To do this, the speed is relative to the average speed increased before and after wrapping and when wrapping slows accordingly. The movement of the swords 2 and thus curve 18 is retained, but the speed changes before and after wrapping the sheet 7.

The transport speed of the sheets 7 to the folding rollers 11 can be constant. The turning of the sheet 7 can also be done if the transport speed of the sheets is not constant is held, e.g. in the area where the sword 2 immersed, is also regulated or controlled. this happens by appropriate control of the double belt 10, preferably also via a servo motor, not shown here. By such Control can be achieved that the sword tip 2a when immersed with respect to sheet 7 neither ahead nor behind running. It can be achieved that the folding rollers 11 leaving sheet 7 despite different to be processed Formats are folded precisely in a simple manner. The invention also has the advantage of smaller formats in the series can be pushed closer together and thus the transport speed can be reduced. The folded sheets 7 can one not shown here but known per se Folders are fed and folded accordingly in this become.

FIG. 3 shows a variant of a sword folding machine according to the invention 30, in which a sword 31 in the manner of a yoke is formed and a linear with respect to two folding rollers 32 Floats. An edge 39 corresponds here the edge 2a of the sword 2. The movement mentioned is by means of a cam 36, which cooperates with a wheel 37, that at a distance from an axis of rotation 35 on a two-armed Lever 33 is mounted. If a curve section 36a comes along the wheel 37 in contact, the sword 31 against the Folding rollers 32 move and effect the turning described above of a sheet 7, not shown here, between the folding rollers 32. A compression spring 38 brings the sword 31 after hammering again in the position shown in FIG. 3. By appropriate Training the cam 36 and by changing the The speed of rotation of this cam can change the sequence of movements of the sword 31 can be changed.

In the sword folding machine 40 shown in FIG Sword 41 moves in the same way as sword 31 Sheet not shown here between two folding rollers 42 takes place also by a linear movement of the sword 41, whereby the speed of this movement can be changed and can also change within a cycle. For example, the Speed of the sword 41 when approaching the Folding rollers 42 are slowed down. The movement of the sword 41 takes place by means of a drive wheel 46, which is not with one here Servomotor shown is rotated in the direction of arrow 47. This rotary movement is with a connecting lever 43, the Joints 44 and 45 with the drive wheel 46 and the sword 41 is connected, transferred into a linear movement of the sword 41. The sword 41 is for this purpose with a not shown here Provide leadership.

Figures 5 and 6 show a sword folding machine 50, the one Compensating mass 51, which is particularly low-vibration Allows speed changes. As can be seen, is a Lever 52 fixed to a shaft 53 mounted on a frame 58 connected, which is driven by a servo motor 54. On the Lever 52 is a gear 54 mounted with the balancing mass 51 and with a sword folding cylinder having a sword 59 55 combs. The gear 54 has a sword lever 56 connected, which is shown here only in a hint, revolving control curve 57 is guided. The control curve 57 can be fixed in the room or movable in the axial direction. By rotating the pivot lever 56, the gear 54 is rotated and accordingly the balancing mass 51 is relative to Blade folding cylinder 55 accelerated in the opposite direction.

The commercial processing line 60 shown in FIG. 7 has one Sword folding machine 61, which is configured as described above is. The sheets to be folded become the sword folding machine 61 fed for example with conveyor belts 62 which are here not shown sheet from a known cross cutter 63 take over. These sheets are from a paper web 64 cut off, which is printed with a printing machine 65. With the printed paper web becomes known turning bars 66 64 fed to a folding former 67, with which it is arranged in the longitudinal direction is folded. Via inlet rollers 67 and guide rollers 68 and two Pulling and deflecting rollers 67, 70 the paper web 64 comes to a Band pair 76, which is arranged immediately before the cross cutter 63 is.

The function of the conveyor belts 62 corresponds to that in FIG. 1 shown and described above double band 10 and capture the sheets delivered individually and one after the other by the cross cutter 63 and feed them to the sword folding machine 61. As before mentioned above, the sheets are used in the formation of the cross fold struck between oppositely driven folding rollers 71. The folded sheets 72 are after the folding rollers 71 by rollers 73rd of a transport switch 74 and can use this further Processing machines not shown here and finally one Display 75 are supplied. The processing machines mentioned can further folding machines and / or perforating, punching or Gluing machines and labeling devices. This Machines and devices can also be placed in front of the sword folding machine be arranged.

Claims (14)

1. Knife folder for cross folding sheets (7) fed individually by a piece of apparatus, having a pair of folding rollers (11) arranged at right angles to the direction in which the sheets are fed and which rotate in opposite directions, as well as a knife (2, 31, 41) which deflects each of the incoming sheets between the pair of folding rollers (11) and is driven in a more or less regular timing cycle, characterised in that within a folding cycle the speed of the knife (2) can be varied relative to the speed of the sheets (7) in order to produce different formats of the folded sheets (7), and that the sheets (7) are folded as they move and without any stop device.
2. Machine according to claim 1, characterised in that the knife is moved in such a way that its speed at the moment of folding is lower than its average speed.
3. Machine according to claim 1, characterised in that the knife (2) is adapted to be rotated.
4. Machine according to claims 2 or 3, characterised in that a further controlled or regulated driving motion is superimposed on the speed profile of the knife (2, 31, 41) during a cycle.
5. Machine according to any of claims 1 to 4, characterised in that the travelling speed of the apparatus for feeding sheets (7) to the folding rollers (11) can be controlled or regulated.
6. Machine according to claim 5, characterised in that the travelling speed of the sheets (7) to be folded can be controlled or regulated, at least in the zone in which the knife (2, 31, 41) is active.
7. Machine according to any of claims 1 to 6, characterised by the provision of a counterweight which can be accelerated in the opposite direction to the knife (2) or a knife holder (1).
8. Machine according to any of claims 1 to 7, characterised in that the knife holder (1) is powered by a servomotor (17).
9. Machine according to any of claims 1 to 8, characterised in that the knife (2) is arranged on a rotatable knife holder (1) and that the knife holder (1) turns at a constant speed of rotation, whereas a cyclic and non-uniform motion is superimposed on the knife's movement.
10. Line for performing jobbing work with a machine according to any of claims 1 to 9, characterised in that viewed in the direction of travel at least one printing unit and one guillotine (63) are arranged ahead of it and a delivery unit after it.
11. Line for performing jobbing work according to claim 10, characterised in that the speed of the knife holder during a folding cycle of the folding machine (30) can be controlled or regulated by means of a controlling or regulating device (17).
12. Line for performing jobbing work according to claim 10 or 11, characterised in that viewed in the direction of travel a former (67) for making a lengthways fold in the paper web (64) is arranged ahead of the guillotine (63).
13. Line for performing jobbing work according to claim 11 or 12, characterised in that the printing unit and the folding section are arranged in line or at an angle or in a "U" configuration in relation to one another.
14. Line for performing jobbing work according to any of claims 11 to 13, characterised in that viewed in the direction of travel there are angle bars (66) arranged after the printing machine.

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