EP1749774B1 - Folding drum of a folding device in a printing machine. - Google Patents

Description

The invention relates to a folding drum of a folding apparatus of a printing press according to the preamble of claim 1.

Folding machines of printing presses serve for the formation of folds on printed substrates, wherein in the case of folding machines known from the prior art, a web-shaped printing material is usually first passed through a first longitudinal folding unit designed as a former, so as to form a first longitudinal fold on the web-shaped and preferably not yet severed printing substrate train. Starting from the first longitudinal folding unit or from the former, the web-shaped printing material is guided in the direction of a Querfalzeinheit comprising a cutting blade cylinder, a folding blade, a jaw cylinder and possibly a gripper cylinder. In the area of the cutting blade cylinder, specimens are separated from the web-shaped printing material, which are moved by means of the folding blade cylinder in the direction of the jaw cylinder. The separated on the cutting blade cylinder copies, which are moved by the folding blade cylinder in the direction of the jaw cylinder, are transferred to form a first transverse fold from the folding blade cylinder to the jaw cylinder. Further, second Querfalze can be formed between the jaw cylinder and the gripper cylinder, which cooperates with the jaw cylinder. The specimens thus provided with a longitudinal fold and with at least one transverse fold reach, starting from the transverse folding unit, into the region of a second longitudinal folding unit, which usually comprises folding drums. With the help of the folding drums, which each comprise a folding blade, second Längsfalze be formed on the already pre-folded copies, which are parallel to the longitudinal fold formed in the first Längsfalzeinheit. Such a folding drum is from the DE 103 14 945 B4 known.

The from the DE 103 14 945 B4 Known folding drum has two opposite folding drum side walls, which engage pins, wherein the folding drum can be rotatably mounted on the pins on a frame or frame. Between the folding drum side walls extends a folding blade or folding blade spindle, which is rotatably mounted on positioned in the region of the folding drum sidewalls spherical roller bearings. The use of such roller bearings is required to intercept or absorb the forces occurring during operation of the folding drum, namely the process force, weight and centrifugal force. However, roller bearings require a relatively large minimum load, which can not be met, especially in the lower and middle speed range of the folding drum. Due to the inertia and the strong reduction of the forces acting in the radial direction, sliding movements between the rollers and the raceway of the roller bearings can form during sudden load drops, which can lead to increased bearing wear.

Proceeding from this, the present invention seeks to provide a novel folding drum of a folding apparatus of a printing press. This object is achieved by a folding drum according to claim 1. According to the invention, in each case at least one device is positioned laterally next to the roller bearings serving for mounting the folding blade spindle in order to introduce a radial force into the folding blade spindle and thus to bias the respective roller bearing in the radial direction.

For the purposes of the present invention, it is proposed to introduce into the Falzmesserspindel a radial force and thereby bias the roller bearings, which serve to support the Falzmesserspindel in the radial direction. The bias of the roller bearings prevents sliding movement between the rollers and the raceway of the roller bearings, whereby bearing wear in the lower speed range and sudden load shedding can be significantly reduced.

The size of the radial force to be introduced into the folding blade spindle and thus the size of the radial prestressing of the roller bearings is preferably dimensioned such that the sum of all acting forces and moments prevents a force direction reversal of the bearing forces. As a result, a running through the bearing clearance can be avoided, whereby on the one hand, a reduction of the game can be reduced in a transmission of the folding drum, and on the other hand, the folding accuracy can be increased.

According to an advantageous embodiment of the invention, each means for introducing the radial force in the Falzmesserspindel comprises an acting on the Falzmesserspindel ball bearing and acting on the ball bearing spring element, wherein the ball bearing is arranged together with the respective roller bearing in a bearing housing such that the roller bearing axially and supported radially on the bearing housing and the laterally positioned next to the respective roller bearings ball bearing is arranged without axial and radial support on the bearing housing in the same.

Preferably, the spring element engages the respective ball bearing with the interposition of a ring surrounding the ball bearing, wherein the radial force spread by the spring element is independent of speed adjustable via a biasing element acting on the spring element.

Fig. 1:

eine erfindungsgemäße Falztrommel eines Falzapparats einer Druckmaschine im teilweisen Querschnitt; und

Fig. 2:

das Detail II der Falztrommel gemäß Fig. 1.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. An embodiment of the invention will be described, without being limited thereto, with reference to the drawing. Showing:

Fig. 1:

a folding drum according to the invention of a folding apparatus of a printing press in partial cross section; and

Fig. 2:

the detail II of the folding drum according to Fig. 1 ,

Hereinafter, the invention with reference to Fig. 1 and 2 described in more detail.

Fig. 1 shows a folding drum 10 according to the invention of a folding apparatus of a web-fed rotary printing press, wherein the folding drum 10 serves to form so-called second longitudinal folds separated from a web-shaped printing substrate and prefolded with a first longitudinal fold and at least one transverse fold copies.

In the Fig. 1 At the folding drum side walls 11 and 12 engage laterally pins 13 and 14, wherein the folding drum 10 is rotatably supported via the pins 13 and 14 in a frame or frame 15. For rotatably supporting the folding drum 10 on the frame 15 are used in Fig. 1 illustrated bearing 16 which engage with a fixed bearing ring on the frame 15 and with a rotating bearing ring on the pins 13 and 14 respectively. As a result, the entire folding drum 10 is rotatable about a longitudinal axis 17.

A folding blade spindle 18 is positioned between the folding drum side walls 11 and 12, wherein a folding blade 20 is fastened to the folding blade spindle 18 in the exemplary embodiment shown via a folding blade carrier 19. The folding blade spindle 18 is rotatable about a longitudinal axis 21, wherein the longitudinal axis 21, about which the folding blade spindle 18 is rotatable, parallel to the longitudinal axis 17, about which the entire folding drum 10 is rotatable. It should be noted that the rotational movements about the two longitudinal axes 17 and 21 are preferably carried out at different speeds, wherein the speed of the Falzmesserspindel 18 about the longitudinal axis 21 is preferably twice as large as the rotational speed of the entire folding drum 10 about the longitudinal axis 17th

The folding blade spindle 18 is rotatably mounted at lateral ends via roller bearings 22, wherein the roller bearings 22 are positioned in a bearing housing 23. In particular Fig. 2 can be removed, the respective roller bearing 22 is supported on the bearing housing 23 in the axial direction and in the radial direction. The roller bearings 22 are preferably designed as spherical roller bearings.

For the purposes of the present invention, it is now proposed that at least one device 24 is positioned laterally next to the roller bearings 22 in order to introduce a radial force into the folding blade spindle 18 and thus to bias the roller bearings 22 in the radial direction. Due to the radial prestressing of the roller bearings 22, a drop below the minimum load for the roller bearings 22 can be avoided, in particular in the lower speed range of the folding drum 10 and in a sudden load shedding, so that no slippage or sliding between the rollers and the track of the roller bearing 22 can form. As a result, wear of the roller bearings 22 is minimized.

The size of the radial biasing force is preferably dimensioned such that the sum of all acting forces and moments does not allow a change in the direction of force of the bearing forces of the roller bearings 22, so that a bearing clearance is not traversed.

The positioned on the sides of the two roller bearings 22 devices 24, which serve to initiate the radial force in the Falzmesserspindel 18 and thus the radial bias of the roller bearings 22, each comprising a ball bearing 25 and a spring element 26. The ball bearings 25 are preferably designed as deep groove ball bearings and engage the folding blade spindle 18. The spring element 26 engages the ball bearing 25 with an intermediate arrangement of a ring 27, wherein the ring 27 surrounds the respective ball bearing 25 and radially outwardly comprises a pocket, in which the spring element 26 is received.

In particular Fig. 2 can be removed, the ball bearing 25 is positioned together with the roller bearing 22 in the bearing housing 23; However, the ball bearing 25 is positioned without axial and radial support on the bearing housing 23 in the same, so that the storage of the Falzmesserspindel 18 is not overdetermined. The introduction of the radial force in the Falzmesserspindel 18 and thus the radial bias of the roller bearings 22 is thus decoupled from the rotational movement of the Falzmesserspindel 18th

Like also Fig. 2 can be removed, the means 24 for initiating the radial force in the Falzmesserspindel 18 and thus arranged for radial bias of the roller bearings 22 immediately adjacent to the respective roller bearing 22, wherein between the device 24 and the roller bearing 22 and between the ball bearing 25 and the roller bearing 22 only a spacer ring 28 is positioned.

The spring element 26 of the device 24 may be formed as a plate spring, compression spring or any other spring. As an alternative to spring elements and gear transmission stages or Zugmittelgetriebestufen can be used to provide the radial force and initiate the ball bearing 25 in the Falzmesserspindel 18.

The radial force provided by the respective spring element 26 can be adjusted with the aid of a biasing element 29 acting on the respective spring element 26. The biasing member 29 is performed in the embodiment shown as a guided in a bore 30 grub screw 31, wherein the position of the grub screw 31 within the bore 30, the bias of the spring member 26 and thus determines the radial force provided by the spring element 26. The position of the grub screw 31 within the bore 30 is fixed by a further grub screw 32, which is guided in a direction perpendicular to the bore 30 bore 33 and presses for fixing the run in the bore 30 grub screw 31 against the same. The holes 30 and 33 are therefore connected.

The power flow to the radial bias of the roller bearings 22 extending from the bearing housing 23 via the biasing device 29 in the spring element 26, from the spring element 26 in the ball bearing 25 surrounding ring 27 and of this ring 27 in the ball bearing 25. About the ball bearing 25 is the Radial force introduced into the Falzmesserspindel 18, whereby the roller bearings 22 are biased. From the roller bearings 22, the force is dissipated in the bearing housing 23.

In particular Fig. 1 can be removed, the roller bearings 22 and the roller bearings 22 associated means 24 for biasing the same with a lateral distance from the folding drum side walls 11 and 12 are arranged, namely between the folding drum side walls 11 and 12. So shows Fig. 1 Distances a and b of the center of the roller bearings 22 of the folding drum side walls 11 and 12, which can be reduced or reduced by these distances a and b, the span of the roller bearings 22. As a result, a mass saving can be realized.

LIST OF REFERENCE NUMBERS

10

folding drum

11

Falztrommelseitenwand

12

Falztrommelseitenwand

13

spigot

14

spigot

15

frame

16

camp

17

longitudinal axis

18

folding-

19

Falzmesserträger

20

folding blade

21

longitudinal axis

22

roller bearing

23

bearing housing

24

Facility

25

ball-bearing

26

spring element

27

ring

28

spacer

29

biasing member

30

drilling

31

grub screw

32

grub screw

33

drilling

Claims (8)

1. A folding drum (10) of a folding apparatus of a printing machine, in particular a web-fed rotary printing machine, for the formation of two longitudinal folds on copies separated from a web-type printing material and pre-folded with a first longitudinal fold and also preferably with at least one cross-fold, having pins (13, 14) which engage on opposing folding-drum side walls (11, 12) and are used for the rotatable mounting of the folding drum on a frame (15) or stand, and having a folding-blade spindle (18) which is arranged between the folding-drum side walls (11, 12) and is rotatably mounted by way of roller bearings (22) and with which at least one folding blade (20) engages, characterised in that positioned at the side next to the roller bearings (22) used to mount the folding-blade spindle (18) there is in each case at least one device (24) to introduce a radial force into the folding-blade spindle (18) and thus pretension the respective roller bearing (22) in the radial direction.
2. A folding drum according to claim 1, characterised in that each device (24) for introducing the radial force into the folding-blade spindle (18) comprises a ball bearing (25), acting on the folding-blade spindle (18), and preferably a spring element (26) providing the radial force and acting on the ball bearing (25), with the ball bearing (25) decoupling the introduction of the radial force from a rotary movement of the folding-blade spindle (18).
3. A folding drum according to claim 2, characterised in that the roller bearings (22) are supported axially and radially in a bearing housing (23), and in that the ball bearing (25) which is positioned at the side next to the respective roller bearing (22) is arranged without axial and radial support on the bearing housing (23) in the same.
4. A folding drum according to claim 2 or 3, characterised in that the ball bearing (25) is arranged directly to the side next to the respective roller bearing (22), with a spacer ring (28) being positioned between the ball bearing (25) and the respective roller bearing (22).
5. A folding drum according to one or more of claims 2 to 4, characterised in that the radial force provided by the respective spring element (26) is independent of rotational speed, with the radial force provided by the spring element (26) being adjustable by way of a pretensioning element (29) that operates on the spring element (26) and in particular is formed as a screw.
6. A folding drum according to one or more of claims 2 to 5, characterised in that the spring element (26) acts on the respective ball bearing (25) with interposition of a ring (27) surrounding the ball bearing (25), with the spring element (26) being positioned in a radially outlying pocket of the ring (27) and thus being secured in the axial position.
7. A folding drum according to one or more of claims 2 to 6, characterised in that the roller bearings (22) are formed as self-aligning roller bearings, and the ball bearings (25) are formed as deep-groove ball bearings.
8. A folding drum according to one or more of claims 1 to 7, characterised in that the roller bearings (22) and the devices (24) that are associated with the roller bearings for the introduction of the radial force into the folding-blade spindle (18) are arranged with reduction of the support width of the roller bearings (22) at the side next to and also between the folding-drum side walls (11, 12).

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