EP1872963B1 - Device for pressing book block - Google Patents

Description

The present invention relates to a device for pressing book blocks according to the preamble of claim 1.

In the EP 0 676 303 B1 11 and 12, a generic device for pressing book block is shown, in which the support bearing is laterally supported against the action of cup spring packages as a spring element, whereby a pressing force is applied for transferring the signature of the book block in the side regions of the back. During the return stroke of the press beam to the center of the block, the action of the disk spring assembly is canceled to prevent entrainment of the folded to the sides outer sheet. In this case, the movement of the press beam can be additionally controlled such that it comes free during its return stroke of the block back by an upward movement to sit in the middle of the block back on the back, for pressing the opposite side of the block spine.

The control of the plate spring assemblies and thus the lateral position of the support bearing is arranged by laterally of the support bearing, controlled by cams ram, which act on the support bearing alternately and transfer the cup spring assemblies from a support position for applying a pressing force in a discharge position.

The above-described position control with the spring force relief allows the pressing of sheets with high as well as low rigidity, without the sheets bend or be pushed back again. In this case, a single squeezing on each side of the block spine is sufficient to form the desired fungal back shape.

However, when placing the press bar centrally on the block back, there is a risk that the press bar will compress the middle press sheets with the result of creases. On the other hand, only loose contact of the press beam in the center of the block reduces the spread of the strains from the rounding in the glue film, as a result of which the previously created rounding in the middle of the block can no longer be adequately stabilized.

The present invention is an object of the invention to provide a device for pressing book block according to the preamble of claim 1, which enables an improvement in the quality of the book blocks.

This is achieved by the invention in that when lowering the press bar on the block back an off-center starting position of the press bar is provided by the carriage receiving the pressing beam is offset in a relation to the respective side to be squeezed off to the opposite side pivot position of the block center , Thus, with each press-off of one side, the middle of the block is swept over, without the press beam acting on the outer press-out sheet of the book block which has been pressed or pressed in the opposite direction of the press bar. An exact height adjustment is not necessary, since the middle of the block is struck in two opposite rolling / pulling movements, without the sheets are compressed mid-block by a moving from the top of the block center pressing bar.

In a further embodiment according to claim 2, the support bearing to the same side of the block center laterally offset controlled in such a way that the press beam first with its lying approximately in the effective surface pivot center touches the block back and the subsequent rolling / pulling movement of the press beam in constant contact with the block back occurs without unwanted printed sheet displacements occur.

Advantageous further developments of the invention are the subject of further subclaims.

Fig. 1

in einer teilweise schematischen Ansicht eine Abpressstation mit in der Ausgangsstellung zum Absenken positioniertem Pressbalken;

Fig. 2

in gleicher Ansicht die Abpressstation mit abgesenktem Pressbalken in Abpressbewegung;

Fig. 3

die Abpressstation beim Abheben des Pressbalken am Ende einer Abpressbewegung;

Fig. 4

die Abpressstation mit in einer zweiten Ausgangsstellung positioniertem Pressbalken; und

Fig. 5

eine Detailansicht der Federkrafteinstellung.

The features of the present invention will be explained in more detail in the following description of a preferred embodiment with reference to the accompanying drawings listed below. Show it

Fig. 1

in a partially schematic view of a press station with positioned in the starting position for lowering the press bar;

Fig. 2

in the same view the Abpressstation with lowered pressing beam in Abpressbewegung;

Fig. 3

the pressing station when lifting the pressing beam at the end of a pressing-off movement;

Fig. 4

the Abpressstation with positioned in a second initial position of the press bar; and

Fig. 5

a detailed view of the spring force adjustment.

Following a back round process, the book blocks 2 reach by means of a reciprocating transport bracket carriage 3 in a Abpressstation 1, in which the back 2 a rounded book block 2 receives its fungal back shape, which is determined by a deep or flat formed fold 2 c.

The pressing is carried out by a over the entire width of the back of the book block 2 reciprocating clamping bar 9 as a forming tool with a concave effective surface 9 a, thereby using pressure and friction, the signature of the book block 2 from the center 2 b of the block spine 2 a be moved to the two sides, under an outwardly increasing angle. To carry out the pressing-off operation, the book block 2 is clamped with a defined projection from the rounding end between the pressing jaws 4.

The pressing bar 9 is removably attached to a receptacle 8, which is located in a bridge-like carriage 7, which is provided on both sides with arcuate grooves 7 a, over which the carriage 7 is pivotally guided in associated roller conveyors 6 of a support bearing 5, In a known manner, the pressing beam 9 is reciprocated from the main drive via an articulated to the carriage 7 engaging drive rod 17.

Said support bearing 5 is pivotally suspended from a height-adjustable arm 10, wherein the common pivot point is guided centrally by a frame-hinged coupling rod 16 above the block back 2 a, while the support bearing 5 with respect to a pivoting movement about said pivot point of a laterally hinged, cushioning coupling rod 22 is supported.

For clock-wise placing and lifting of the press bar 9 on or from the block back 2 a of the handlebar 10 is moved by a controlled by a drive rod 12 eccentric shaft 11 in height. To adjust the height of the press beam 9 to the respective book block height, the eccentric shaft 11 is mounted in side plates 13, which guided in guides 14 of the machine frame by an adjusting device 15 in height can be fixed.

According to the invention, the pressing beam 9 is lowered eccentrically into the center of the block 2 b offset pivoting position from above on the block back 2 a. The carriage 7 with the Press bar 9 accommodated therein is pivoted to the side by a defined angle, for example 15 °. Its pivot center 18 is also offset by the lateral displacement of the support bearing 5 to the center offset 19 of the block center 2 b, so that the pivoted beam 9 first touches with the pivot center 18 on the block back 2 a. There are no unwanted printed sheet displacements and the pressing bar 9 does not act in the side area of this block back side.

For lateral displacement of the support bearing 5, a position control 21 is provided, which changes the articulation point of the cushioning coupling rod 22. The pivot point is arranged on a rotatably mounted in the frame lever 32 which is controlled by a drive rod 33 of known drive means not shown in detail. In the FIGS. 1 to 4 the respective position is shown by means of a pointer 32 arranged on the lever on a scale. Starting from a central position 32 a is a first and a second offset position 32 b, c provided, depending on which side of the block back 2 a of the pressing beam 9 touches.

After placing the press beam 9 whose pivotal movement is initiated for pressing the opposite side of the block back 2 a of the drive rod 17, wherein during pivoting to the block center 2 b, the support bearing 5 in the spring-supported center position 32 a is controlled back. In the further course of the pivotal movement of the press beam 9, the support bearing 5 deviates laterally against the spring force of the cushioning coupling rod 22, whereby a rolling / pulling movement of the press beam 9 sets and a pressing force for moving the signature of the book block 2 in the side regions of the block spine 2 a is applied.

The cushioning coupling rod 22 is formed from a rod 23 which is slidably guided in sockets 26, 30 a, b of a receptacle 25. At one end of the rod 23, a joint head 24 is provided for connecting the coupling rod 22 to the support bearing 5, while for the articulation of the coupling rod 22 on the lever 32, a second condyle 27 is located on the receptacle 25.

Of the aforementioned sockets 26, 30 a, b, the sleeve 26 is slidably received in the receptacle 25, while the sockets 30 a, b are arranged in a holder 30 which is displaceably guided on the tie rods 28 away from the receptacle 25. Between each provided with a stop bushes 26 and 30 b is now a compression spring 29, the said arrangement against a shoulder 23 a and on the rod 23 arranged nuts 23 b apart, to form a defined length of the coupling rod 22 in the unloaded state.

When acting from the outside on the coupling rod 22 compressive force, according to Abpressvorgang in Fig. 2 , Pushes the rod 23 via nut 23 b, holder 30 and sockets 30 a, b against the compression spring 29, as a result, the coupling rod 22 is shortened by displacement of the holder 30 on the tie rods 28 and acts as a reaction force, a compressive force on the support bearing 5.

At the end of the first pressing operation, the lever 32 is controlled in a relief position 32 d, whereby the compression spring 29 relaxes. According to Fig. 3 is the unloading stroke dimensioned such that the coupling rod 22 occupies its unloaded length and the pressing bar 9 is virtually pulled away from the block back 2 a.

The pressing bar 9 is raised via drive rod 12, eccentric shaft 11, arm 10 and support bearing 5 and pivoted back via drive rod 17 and slide 7 in a second starting position for pressing the opposite side of the block spine 2 a, as in Fig. 4 seen. In this case, the support bearing 5 is transferred from the position controller 21 in a corresponding offset position, which is defined by the offset position 32 c of the lever 32.

When pressing the second side of the block spine 2 a, after the coupling rod 22 is again controlled back to its center position 32 a, a tensile force on the coupling rod 22 is effective, causing the sleeve 26 against the spring force of the compression spring 29 moves in the receptacle 25. The support bearing 5 deviates by the extension of the coupling rod 22 force controlled to the relevant Abpressseite, so that again the desired rolling / pulling movement sets and a pressing force acts on the block back 2 a.

At the end of the second pressing operation, the lever 32 is controlled in a corresponding unloading position, to relax the compression spring 29. The pressing bar 9 is raised and moved back into the first starting position. In this case, the finished pressed-out book block 2 is conveyed after opening the pressing jaws 4 by the transporting clamp carriage 3 to a further processing device, while at the same time a new rounded book block 2 is supplied.

To adjust the Abpresskraft to the particular condition of the sheet is still a spring force adjustment 31 is provided. How out Fig. 5 it can be seen the distance

LIST OF REFERENCE NUMBERS

1

backing station

2

book block

2 a

block spine

2 B

block center

2 c

fold

3

Transport clamp cars

4

pressing jaw

5

support bearings

6

roller conveyor

7

carriage

7 a

groove

8th

admission

9

pressing bars

9 a

concave effective surface

10

handlebars

11

eccentric shaft

12

drive rod

13

side plate

14

guide

15

adjustment

16

coupling rod

17

drive rod

18

Swing center

19

center offset

21

position control

22

cushioning connecting rod

23

pole

23 a

paragraph

23 b

mother

24

joint head

25

admission

26

Rifle

27

joint head

28

pull bar

29

compression spring

30

holder

30 a

Rifle

30 b

adjustable socket

31

Tension adjustment

32

lever

32 a

center position

32 b

first offset position

32 c

second offset position

32 d

relief position

33

drive rod

Claims (6)

1. A device for the mechanized backing of rounded book blocks (2) that are held in a clamped fashion in the area near the spine

   • by means of a pressing beam (9) that preferably has a concave effective area (9 a) and acts upon the block spine (2 a) with a pressing force,

   • with a slide (7) that accommodates the pressing beam (9) and can be alternately displaced along arc-shaped races (6) in a swinging fashion by driving means (17), namely toward one side and the other side of the block spine (2 a) in a height-adjustable supporting bearing (5) that is laterally supported against the effect of a spring element (29), wherein the traveled radius of the effective area (9 a) of the forming tool (9) is smaller than the radius of the block spine (2 a) and a tangential pull/push component for turning over the printed sheets acts upon the lateral areas of the block spine,

   • with means (21, 22, 32, 33) for controlling the lateral position of the supporting bearing (5), and

   • with means (10, 11, 12) for lowering the pressing beam (9) on the block spine (2 a) and for raising the pressing beam into the starting position for its return stroke,

   characterized

   • in an eccentric starting position during the lowering of the pressing beam (9) on the block spine (2 a) in the form of a swinging position of the slide (7) that is offset toward the opposite side of the block spine center (2 b) referred to the respective side to be backed thereafter.
2. The device according to Claim 1, characterized in that the supporting bearing (5) is laterally offset relative to the block spine center (2 b) toward the same side in the eccentric starting position such that the pressing beam (9) is placed on the block spine with its center of swinging motion (18) that approximately lies in the effective area (9 a).
3. The device according to Claim 2, characterized in that the supporting bearing (5) is returned into the cushioned center position (32 a) while the pressing beam (9) swings up to the block spine center (2 b) in order to back and turn over the sheets on the actual block spine side during the continued swinging motion of the pressing beam (9).
4. The device according to one of Claims 2 to 3, characterized in that the position control for the supporting bearing (9) is realized by displacing the position of the supporting point for the spring element (22, 29) that supports the supporting bearing (5).
5. The device according to one of Claims 1 to 4, characterized in an adjustable spring force (31) of the spring element (22, 29) that supports the supporting bearing (5).
6. A method for the mechanized backing of rounded book blocks (2) that are held in a clamped fashion in the area near the spine, wherein a pressing beam (9) that preferably has a concave effective area (9a) acts upon the block spine (2a) with a pressing force and alternately swings to one and the other side of the block spine, characterized in that the pressing beam is during the backing of each side of the block spine respectively placed on the block spine (2a) on the opposite side eccentric of the block spine center (2b).

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