EP0977700A2

EP0977700A2 - Method and device for cross-folding signatures

Info

Publication number: EP0977700A2
Application number: EP98931960A
Authority: EP
Inventors: Horst Bernhard Michalik
Original assignee: Koenig and Bauer AG
Current assignee: Koenig and Bauer AG
Priority date: 1997-04-21
Filing date: 1998-04-21
Publication date: 2000-02-09
Anticipated expiration: 2018-04-21
Also published as: US6234947B1; WO1998047804A3; DE19716628A1; DE59801003D1; WO1998047804A2; DE19716628C2; JP2000510427A; RU2184071C2; EP0977700B1

Abstract

The invention relates to a method and device for cross-folding signatures (78) for both thin and thick folded products, without damaging said products. According to the invention, the signatures (78) are pressed into a pre-folding, gripping element system (28) by means of a folding blade (23). The pre-folding, gripping element system picks up the signatures to form a pre-fold (83). The pre-folded product is then retained, transported and conveyed to a pair of rotating folding rollers (61, 62) for the folds to be completed.

Description

Method and device for cross-folding signatures

The invention relates to a method for cross-folding signatures according to the preamble of claims 1 and 4 and an associated device.

It is generally known _/ to produce transverse fold products _{/ in} that a plurality of paper web sections _/ signatures guided on one another are _/ pushed into each of the folding jaws of a folding jaw cylinder by means of a folding knife of a folding knife cylinder.

With such folding devices, cross-fold products can only be produced up to 96 newspaper pages _/ otherwise the inner and outer parts of the cross-fold product will be damaged.

The invention is based on the object _/ to a method and an associated apparatus for manufacturing to create a transverse fold.

This object is achieved by the features of claims 1 and 4. The advantages that can be achieved with the invention are, in particular _, that thick folding products of up to 192 pages can be cross-folded with relatively little force. Because the center of the fold fold is precisely defined by the action of the pre-fold clamping elements _/ an exact transverse fold is generated _/ especially since both halves of the signatures are each drawn into the pre-fold clamping gap by an equal amount of the penetration depth of the folding knife. Since cross folding takes place in two stages _/ pre-folding and finishing folding _/ the forces required for each folding stage are reduced. The use of cylindrical pre-rebate clamping elements of the pre-rebate clamping element system with a mouth-like effect means that the side surfaces of the pre-rebate clamping gap connected to the pre-rebate nip are treated without damage. Likewise, the pre-folding of the prefabricated product is carried out up to 192 pages without damage due to the use of folding rollers.

An embodiment of the invention is shown in the drawing and is described in more detail below.

Show it

Figure 1 is a cross section through a schematic representation of a folder. 2 shows a cross section through an enlarged schematic illustration of a prefitting element _/ which has just received a transverse fold product;

Fig. 3 shows a longitudinal section III - III of FIG. 1 _/ wherein only one end of a prefabricated element is shown with a central control of the prefabricated element systems.

Between side frames 1; 2 are two longitudinal folds r 3; 4 arranged _/ which on their Papi erei nlauf te te have a motor driven 6 Trichterei nlauf wa Ize 7. At their trich run out te are a pair between side frames 8; 9 located Tric terfalzwalzen 11 _/ each a draw roller group 12 and transfer rollers 13 arranged _/ which one or more strands of paper 14; 16 via a main draw roller group 17, also between the side frames 8; 9 stored cross cutting and cross salt device 18 passes. The cross-cutting and ^Q uerfalze nrichtung 18 has a known two-part _/ that is, with two cutting blades 19 provided cutting cylinder 21 on _/ in turn, against a known five-part folding blade, Nutleiste- and Punkturzy li nde r 22 - or transport and Falzmesserz l Direction mentioned - is working. This cylinder 22 has five folding knives and folding knife fittings 23 _/ arranged on its circumference. Grooved strips 24 and puncture systems 26.

The cross cutting and cross folding device 18 also has a rotary body _/ z. B. a Vorf a Izzy cylinder 27 with a number n, z. B. three _/ five or seven, but preferably five, uniformly distributed on its circumference 42 pre-fold clamping element systems 28 _/ which each cooperate with the folder armatures 23 of the cylinder 22 (Fig. 1).

Each of the pre-fold clamping element systems 28 consists of a number m of two to ten adjacent to one another in the axis-parallel direction of the pre-fold Izzy linders 27 and maul-like pairs 29 of folding jaw-like pre-fold clamping elements 31; 32. Between the side walls 33 of the front wall 27 - only one side wall 33 in FIG. 3 - there are two shafts 34; 36 _/ z. B. hollow shafts _/ with the pre-fold clamping elements 31; 32 equipped. The ends of the shafts 34; 36 are mounted in the side walls 33 of the prefabrication 27 and are mutually connected by means of shaft segments 37; 38 or gears synchronized. At the center of the shaft 34; 36 is a torsion bar spring 39; 41 used. One end of the torsion bar spring 39; 41 is with the shaft 34; 46 connected; the other end of the torsion bar 39; 41 is fixed in a not shown l tensioning device. This tensioning device is located on the outside of the non-visible side wall _/ which lies opposite the side wall 33.

Each pre-fold clamping element 31; 32 is formed with a thickening at its end near the periphery and on the side connected to the pre-folded product. For this purpose, the shaft 34 carries finger-like _/ spring-elastic carriers 43 directed radially in the direction of the periphery 42 of the prefix 27, and spaced apart from one another at a distance a. Each carrier 43 carries at its end near the periphery an axially parallel direction to the prefix 27 running cylindrical thickening 46. the end of the pre-folding clamping elements 31 acting on the folded product; 32 protrudes in comparison to the carrier 43.

The second shaft 36 carries in the same way top support 44, each with a cylindrical top section 47. The top support 43; 44 with the on pieces 46; 47 each work as pairs 29 of pre-fold clamping elements 31; 32 together.

It is also possible _/ the carrier 43; 44 and the associated thickening 46; 47 in one piece.

These ends provided with a thickening are not only for pre-fold clamping elements 31; 32 usable _/ but also generally for folding jaws.

On one of the waves, e.g. B. the shaft 34 is rotatably on the shaft end with the clamping point of the torsion bar 39, a control arm 49. The control arm 49 has at its torsionally distal end a roller 51st on, which runs on a known side gesture control curve 52.

Rotation axes 53; 54 of Vorf a Izzy linders 27 and the folding knife, slot bar and Punkturzy li nders 22 are by means of an imaginary central 56 and the axis of rotation 54 is spaced by means of an imaginary centers 57 to an axis of rotation 58 of the cutting cylinder 21. Below these centers 56; 57, the cylinder 22 is surrounded with the most paper guide rods 59.

The Vorf a Izzy li nder 27 are two between the side frames 8; 9 resiliently mounted folding rollers 61, also belonging to the cross-cutting and cross-folding device 18; 62 to finish folding the printed products. The transport of pre-folded printed products between the pre-cylinder 27 and the folding rollers 61; 62 takes place by means of two interacting belt systems 63; 64.

The tapes of the first tape system 63 are on the circumference 42 of the prefabricating device 27 in between the pairs 29 of prefolding clamping elements 31; 32 located grooves 66 and a part of the circumference of the first folding roller 61. In each case at such points of the grooves 66 of the prefabrication 27, on. which there is a pre-fold clamping element system 28, the pre-fold cylinder 27 opposite the periphery 42 Secant-like surface 67 extending in the axis-parallel direction (FIG. 2). This surface 67 has between the closed pairs 29 of the pre-fold clamping elements 31; 32 a depth t which is greater than twice the radius r of the thickenings 46; 47th

Likewise, on the circumference 76 of the transport and folding knife cylinder 22, a secant-like surface 77 extending in the axis-parallel direction to the transport and folding knife cylinder 22 is provided in each case at the point at which folding knives 23 are arranged.

The second belt system 64 is guided above and to the side of the prefabricated cylinder 27, partly by means of belt guide rollers 68, around the prefabricated cylinder 27 and around the second folding roller 62. Both belt systems 63; 64 interact with each other.

The clear distance between the two folding rollers 61; 62 can be adjusted according to the thickness of the transverse fold product by means of a known Fa Izwa Izen-Spa It e rste l Lei nricht 74. Both folding rollers 61; 62 are therefore resiliently mounted against each other in a known manner to temporarily thicken folding products, z. B. after changing and connecting paper webs to compensate.

Above the cylinder 22; 27 are between the inlet the strands of paper 14; 16 and the second belt system 64 be tenste l Ifeste paper guide rods 70 arranged.

Below the folding rollers 61; 62 is in the side frame 8; 9 shows a known paddle wheel 69 with a known printed product ejection system 71 for displaying the transverse fold products on a delivery belt 72. The delivery belt 27 is preceded by a guide belt 73 located laterally on the paddle wheel 69 in the vertical direction.

The opening width of the pairs 29 of

Pre-fold clamping elements 31; 32 is adjustable by means of the shape of the cam track 52.

In order to set the product thickness of the signatures 78 to be pre-folded, the control cam track 52, viewed in the axial direction in cross section, has a width f which corresponds to a multiple width g of the roller track. The control cam track 52 has an increase in cross section, ie over a thickness of the control cam 84, which increases in the direction of the side frame 8. As a result, the control cam 8 is formed in the shape of an actual bottom and is displaceably arranged in the axial direction E of the preassembly 27. The control cam 84 has a central bore and is laterally fastened to a sleeve-shaped control curve 86, an inner diameter of the central bore and an inner diameter of the control curve 86 being the same and both parts 84; 86 are preferably formed in one piece (Fig. 3).

The control cam carrier 86 is arranged together with the control cam 84 coaxially on a side-mounted bearing bushing 87, which in turn accommodates a shaft journal 88 of the prefabricated cylinder 27 in a ball bearing 89 inside. The sleeve-like part of the cam carrier 86 has on its lateral surface 91 an external thread 92 and is by means of z. B. a feather key 93 on the cam carrier 86 against rotation and ax i a l ve rschi ebba r stored.

An internal thread sleeve 94 is engaged with the external thread 92 of the control curve 86 and is connected in one piece to a guide ring 96 on its side side. The guide ring 96 is rotatably supported with its inner tread on the outer surface 91 of the control rage rs 86 and is z. B. by means of a two-part se i tengest l l fixed retaining ring 97, which engages in a circumferential surface 98 in the annular groove 99, secured against axial displacement.

The internal thread sleeve 94 has on its outer surface 98 a toothing 101, which, for. B. is connected by means of a toothed belt 102 to a toothed pulley 103 of a ten ten l if first motor 104. It is rotatably coupled to the motor 104 with a deer angle encoder 106. If the pre-folding nip 81 is to be changed due to the changed thickness of another folding product, the internal thread sleeve 94 is rotated by means of the drive 104 to 101, so that the cam carrier 86 is thereby moved in the axial direction E. Is the roller 51 on the Steue r curve 52 in another, z. B. higher position than shown in Fig. 3, the width of the pre-fold nip 81 is reduced.

Instead of the crowned tread of the control roller 51, as seen in cross section, the control roller 51 can also have a tapered actual shape and thus adapt to the slope of the control cam track 52. The slope of the cam track 52 corresponds to a height of the stroke of the control roller 51.

It is also possible to use folding jaws from

Fa Izk lappenzy was able to adjust its width.

According to a further embodiment variant, the control cam track 52 can also be arranged in a fixed manner and the control arm 49 carrying the roller 51 can be adjustable in the axial direction on the spindle or the torsion bar spring 41. It is essential, however, that the cam track 52, which is inclined with respect to the axis of rotation 53 of the prefabrication 27, is arranged so as to be relatively displaceable relative to the cam roller 51. According to another embodiment variant, the roller 51 located on the control arm 49, the axis of rotation 108 of which runs at right angles to the longitudinal axis of the control arm, can also run on a control cam track, seen in cross-section, in the axial direction 53 of the pre fa Izzy li nde rs 27. A second cylinder-shaped roller located on the control arm 49 in the form of a support roller, the axis of rotation of which runs in the longitudinal direction of the control arm 49, rolls on an outside 107 of the side wall 33 of the prefabricated cylinder 27 with a corresponding radius around the axis of rotation 53 ( not shown ) .

The cylindrical support roller serves to support the axial forces generated by the cam.

A procedure for cross-folding signatures is as follows.

From the overlapping paper strands 14; 16 are cut with the cooperation of the cutting cylinder 21 on the folding knife, groove ledge and Punkturzy li nnd r 22 signatures 78, which at their front edge pointing in the running direction B of the cylinder 22 of a leading part 79 of the signature 78 by means of the puncture systems 26 and a prefabricated clamp system e 28 of the prefabricated coil 27. Each signature 78 is collected or not collected by means of one on the cylinder 22 located folding knife 23 pushed into a pre-fold clamping gap 81 of the pre-fold clamping element system 28. Both the leading part 79 and a trailing part 82 of the signature 78 are pushed into the pre-fold clamping gap 81 by an amount of the depth of penetration of the folding knife 23. Fig. 2 shows a position D of the cylinders 22; 27, in which both the pre-fold clamping elements 31; 32 and the folding knife 23 have already passed through the center 56 by an angle of rotation alpha. After the folding knife 23 has been withdrawn (FIG. 2), the pre-fold clamping elements 31 close; 32 like pliers, or mouth-like, and form a pre-fold 83 on the signature 78.

The punctures of the puncture S stem 26 during the introduction of the signature 78 in the

Vorfalz-nip 81 counterclockwise gerreh direction B of the transport and forme cylinder 22 pulled out of the leading part 79 of the signature 78 (see also DE 195 33 064 A1).

The fact that the thickenings 46; 47 the carrier 43; 44 are cylindrical in shape, the pre-fold 83 is beyond an imaginary contact line of the two thickenings 46; 47 and within the two pre-fold clamping elements 31; 32 designed as a bead. The pre-fold product 83; 79; 82 during further transport on the prefolding cylinder 27 not from the closed prefolding clamping elements 31; 32 slip out. Thus the radius r of a thickening 46; 47 smaller than the depth of penetration of a folding knife 23 into a pre-folding nip 81. After about a quarter turn of the pre-folding cylinder 27 - from the position 56 of the pre-folding - in

Counterclockwise rotation C is the non-visible first pre-fold product between the two belt systems 63; 64 added. The belt systems 63 separate approximately half a revolution of the prefabricating cylinder 27 after the prefolding process; 64 of the prefabricating cylinder 27 (not shown in FIG. 1), the first belt system 63 the prefolding product when the prefolding clamping elements 31; 32 has just lifted out on its pre-fold 83 and subsequently both tape systems 63; 64 the pre-folding product the folding rollers 61; Feed 62 to finish folding.

After leaving the folding rollers 61; 62, the finished folded printed product is transferred to the paddle wheel 69 and subsequently placed on the delivery belt 72.

In addition to the advantages already mentioned, the advantages of pre-folding in two-stage cross folding are that due to the rounding of the peripheral parts of the pre-clamping elements for the signature, a larger support distance between the folding knife and

Pre-fold clamping element is present than in known jaw systems. Due to this larger support distance and the rounding of the peripheral parts, thick folded products can be damaged and with less force than can be introduced into the pre-fold clamping gap in the case of the conventional folding jaw systems. The rounded pre-fold clamping elements protect the outer layers of the folded product due to their large contact area. The inner layers of the folded product are protected by the fact that the folding knife can unwind over the rounded pre-fold clamping elements without pinching the pre-fold product.

In order to prevent the punctures from tearing during the prefolding process, the punctures are additionally moved back into the pre-fold clamping gap by an amount of the penetration depth of the folding knife when retracting relative to the leading edge of the leading part of the signature.

Reference list

1 Side gesture 11 2 Side gesture 11 3 Longitudinal folding funnel 4 Longitudinal folding funnel 5 6 Motor (7) 7 Funnel infeed roller

8 Be gesture 11

9 Be tengestel l

10 -

11 funnel folding roller (3; 4)

12 draw roller group (3; 4)

13 via stirring roller (3)

14 paper strand

15 -

16 paper stacks

17 main roller group

18 cross cutting and cross folding device 19 cutting knife (21)

20 21 Cutting cylinder (18) 22 Folding knife, slot bar and puncture cylinder (18) 23 Folding knife armature (22) 24 Slot bar (22) 25

26 puncture system (22)

27 pre-cylinder (18) Pre-fold clamp element system pair (31; 32)

Pre-Fold Clamp Pre-Fold Clamp Side Wall (27) Shaft (28)

Shaft (28) Tooth segment (34) Tooth segment (36) Torsion bar spring (34)

Torsion bar spring (36) Periphery, circumference (27) Carrier (34) Carrier (36)

Thickening (43) thickening (44)

Control arm (39)

Track roller (49) Cam track rotation axis (27) Rotation axis (22)

Head Office (53; 54) Central (54; 58) axis of rotation (21) paper guide rods

Folding roller (18) Folding roller (18) Belt system, first belt system, second

Groove (63)

Surface (42)

Belt guide roller

Shovel wheel

Paper guide rods

Printed product ejection system

Out of lay tape

Lead tape

Folding roller gap adjustment device

Scope (22)

Surface (76)

Si gnatur

Forward part (78)

Pre-fold nip (28) part, trailing (78) pre-fold (78) cam (27) 86 cam carrier (84)

87 bearing bush (88; 86)

88 shaft journals

89 ball bearings (88)

90

91 lateral surface (86)

92 external thread (91)

93 key

94 internal thread sleeve (96)

95

96 Guide ring (94)

97 retaining ring

98 outer surface (96)

99 ring groove (98)

100

101 toothing (94, 98)

102 timing belts

103 tooth lock washer

104 engine

105

106 rotary encoder (104)

107 outside (33)

108 axis of rotation (51)

B direction of rotation (22)

C direction of rotation (27)

D position (22; 27)

E Movement Direction (84, 86) a distance (47, 47; 46, 46) f width (84) g width (51) m number (28) n number (29) r radius (46; 47) t depth (67)

Alpha rotation angle (22; 27; 56)

Claims

Expectations

1. A method for cross-folding of signatures (78), characterized in that the signatures (78) are provided with a pre-fold (83) by means of pre-fold clamping elements (31), that the pre-fold product (78, 82, 83) is then one Pair of rotating folding rollers (61, 62) is fed to finish folding.

2. The method according to claim 1, characterized in that punctures of a transport system (26) during the introduction of the signature (78) in the pre-fold clamping element system (28) against the direction of rotation (B) of a transport and folding knife cylinder (22) the signature (78) are pulled out.

3. The method according to claims 1 to 2, characterized in that the pref a Iz products (83; 79; 82) by means of a paper guide system (63; 64) out of the open pre-fold clamping elements (31; 32) and the folding rollers (61 ; 62) are supplied.

4. A device for transverse folding of signatures (78) by means of a transport and folding knife cylinder (22), characterized in that the transport and folding knife cylinder (22) has a pre-folding clamping element systems (28)

Vorf a Izzy lnd r (27) for forming a prefabricated product (83; 82; 79) and assigned to the prefabricated Izzy li nder (27) a pair of folding rollers (61; 62) for finishing the prefabricated product (83; 82; 79) are subordinate.

5. The device according to claim 4, characterized in that on the circumference (42) of the pref a Izzy l i nders (27) a number (n) in the axially parallel direction of the pref a Izzy li nders

(27) extending pre-fold clamping element systems (28) are arranged.

6. Device according to claims 4 to 5, characterized in that each pre-fold clamping element system

(28) consists of a number (m) of jaw-working pairs (29) of pre-fold clamping elements (31; 32) that work side by side at an axial distance (a).

7. Apparatus according to claim 6 _/ wherein _/ that the pre-folding clamping elements (31; 32) adjacent to each other (a) spaced apart on a shaft (34; 36) are fixed _/ that both shafts (34; 36) at their ends se tenwandf est in the default cylinder (27) each are connected to one another by means of synchronizing devices (37; 38).

8. Apparatus according to claim 6 _/ wherein the pre-folding clamping element (31; 32) st Trained rounded at its periphery and at the proximal end in communication with the Vorfalzprodukt _{_(79/82/83)} side Idet i.

9. Apparatus according to claim 6, characterized in _/ that the pre-folding clamping element (31; 32) each made of a resilient finger-like carrier (43; 44) close to the periphery with a zy linderf örmigen _/ and axially parallel thickening (46; 47).

10. The device according to claim 9, characterized in that a radius (r) of a thickening (46; 47) is smaller than a depth of penetration of a folding knife (23) in a pre-fold clamping gap (81).

11. The device according to claim 9, characterized in that the carrier (43; 44) and the thickening (46; 47) is integrally formed.

12. The apparatus according to claim 6 _/ characterized in that at least one of the shafts (34 or 39; 36 or 41) of the pre-folding clamping element system (28) with -, - iner control (49; 51; 52) is connected.

13. The apparatus according to claim 7, characterized in that the synchronizing device (37; 38) consists of intermeshing, shaft-fixed tooth segments (37; 38).

14. Device according to claims 6 and 12, characterized in that in the interior of the shaft (34; 36) a single-ended with the shaft (34; 36) connected torsion bar spring (39; 41) is arranged that the torsion bar spring (39; 41 ) can be preloaded at the other end in a side wall of the prefabricating cylinder (27).

15. The apparatus according to claim 4, characterized in that a paper guide system (63; 64) is arranged between the prefabricating cylinder (27) and the folding rollers (61; 62).

16. The apparatus according to claim 15, characterized in that the paper guide system (63; 64) consists of a on the Vorf a Izzy l i nde r (27) and around the first folding roller (61) guided first belt system (63).

17. The apparatus according to claim 15, characterized in that the paper guide system (63; 64) consists of a second tape system (64) guided around tape guide rollers (68) and around the second folding roller (62).