EP1410925B1 - Clamping method and device for chamfering book spines - Google Patents

Description

The present invention relates to a clamping device and trimming units for trimming edges of a book according to the preamble of claim 1.

The US 6,030,163 discloses a method of joining two or more pieces along an edge to produce a bonded printed product. The bound printed product may have an oblique back.

The US 5,086,681 discloses handing over the book by means of a feeding conveyor system comprising a tape. The belt moves at a lower speed than the conveyor chains, so that the impact members arranged on the conveyor chains are subjected to a low frictional force. Upon exiting the feed conveyor system, the books enter a first trimming station.

With known trimmers for trimming books, the problem arises that the gluing of the envelope of a book with the internal sheet material dissolves.

Fig. 1 and 2 show a force vector analysis carried out by the inventors of the present invention, in which the forces occurring when trimming one end of a book 20 by a straight trimming knife 10, ie a trimming knife 10 with a straight edge 12, are analyzed at an angle α. The book 20 includes sheet material 26 and an envelope 22 that is bonded to the sheet material 26 by an adhesive 24.

The result is a perpendicular to the knife edge 12 force FR with a force component F1 parallel to a tangent to the interface between the sheet material 26 and the envelope and an orthogonal to this tangent force component FN. As in Fig. 1 is shown, the orthogonal force FN at the beginning of the cutting operation at the top of the book 26 and the envelope 22 by the knife 22 directed into the book. As a rule, the envelope 22 does not yet detach from the sheet material 26 at this time.

However, as based on Fig. 2 As can be seen, acting on the envelope 22 orthogonal force FN is directed away from the sheet material 26 as the cutting progresses through the lower arcuate portion 28 of the envelope 22, which may result in detachment of the envelope 22 from the sheet material 26, as the force from the sheet material 26 is directed away.

The EP 1 153 872 discloses the generation of a chamfer in a collated sheet product. A method of gluing a spine is described, which includes forming a chamfered spine, moving the chamfered spine in a direction perpendicular to the backsheet, and applying adhesive.

It is an object of the present invention to provide a method of making an oblique spine in a book.

This object is achieved by a method having the features according to claim 1. Further features and advantageous embodiments of the invention are contained in the dependent claims.

A method according to the invention for producing a profiled back in a book having a first side defining or forming a first plane, a second side defining or forming a second plane and a back provides that the book is locked by means of a first clamping element contacting the first side a second clamping member contacting the second side is clamped and that the first clamping member is moved relative to the second clamping member or clamped between the first and the second clamping member to bevel the back by the first side in the first plane or the second side in the second level is moved.

The method according to the invention advantageously makes it possible to produce an oblique back, e.g. can help reduce the risk of detaching the envelope into trimmers.

The method preferably further provides that the oblique spine is trimmed. In this case, the oblique ridge with respect to the first plane can form a preferably acute bevel angle. The trimming process can be done from the first page to the second page. The acute bevel reduces the risk of peeling off the envelope during the trimming process.

Advantageously, the method according to the invention improves the trimming of books, in particular the sides adjacent to the spine. The risk of detachment of the envelope in devices with reciprocating blades is reduced.

A clamping device according to the invention comprises a first clamping element and a second clamping element for clamping a bound book and an actuator which moves the first clamping element with respect to the second clamping element to generate a shearing force in the book.

Furthermore, the present invention provides a trimmer with a knife and a clamping device according to the invention.

Further features and advantageous embodiments of the present invention will be explained in more detail in the following description of preferred embodiments with reference to the accompanying drawings listed below.

Fig. 1

eine Kraftanalyse eines von einer Messerkante des Stands der Technik vorgenommenen Kantenbeschneidvorgangs durch einen oberen Abschnitt eines Buchrückens;

Fig. 2

eine Kraftanalyse eines von einer Messerkante des Stands der Technik vorgenommenen Kantenbeschneidvorgangs durch einen unteren Abschnitt eines Buchrückens;

Fig. 3

eine Ausführungsform eines Trimmers, der eine erste Ausführungsform einer erfindungsgemäße Klemmvorrichtung umfasst;

Fig. 4

die in Fig. 3 gezeigte Ausführungsform bei einer Abwärtsbewegung des Beschneidmessers;

Fig. 5

eine zweite Ausführungsform einer erfindungsgemäßen Klemmvorrichtung;

Fig. 6

eine dritte Ausführungsform einer erfindungsgemäßen Klemmvorrichtung;

Fig. 7

eine schematische Draufsicht der in Fig. 3 gezeigten Ausführungsform; und

Fig. 8

eine Kraftvektorenanalyse am schrägen Rücken.

Show it:

Fig. 1

a force analysis of an edge trimming operation performed by a knife edge of the prior art through an upper portion of a spine;

Fig. 2

a force analysis of an edge trimming operation made by a knife edge of the prior art through a lower portion of a spine;

Fig. 3

an embodiment of a trimmer, which comprises a first embodiment of a clamping device according to the invention;

Fig. 4

in the Fig. 3 embodiment shown in a downward movement of the trimming knife;

Fig. 5

a second embodiment of a clamping device according to the invention;

Fig. 6

a third embodiment of a clamping device according to the invention;

Fig. 7

a schematic plan view of the in Fig. 3 embodiment shown; and

Fig. 8

a force vector analysis on the sloping back.

Fig. 3 shows a first embodiment of a edge trimmer with a clamping device 50, which comprises a first clamping element 52 and a second clamping element 54. The second clamping element 54 may be a horizontally stationary or movable base in this embodiment. An uncut book 30 has a first side 32 defining or forming a first plane 42 and a second side 34 defining or forming a second plane 44. The sides 32, 34 may be formed by an envelope for the sheet material 36, which envelope may have a spine 38 with an adhesive 39 binding the sheet material 36.

The side 34 lies horizontally on the clamping element 54, which gives the book 30 advantageously a stable position. The clamping member 52 can now clamp the first side 32 by moving in the direction 53.

The clamping element 52 may e.g. be attached to a rod 55, on whose side a cam follower 105 extends. The cam follower 105 may be driven by a piston 100 pivotally mounted on the cam follower 105, the other end of which is pivotally attached to a stationary support such that the cam follower 105 follows a cam 112 in a cam base 110. When the piston is extended, the cam follower 105 is moved cam downward in the direction 53, so that the clamping member 52 clamps the book 30.

As in Fig. 4 5, the clamping member 52 can then be moved in the direction 57 when the cam follower 105 reaches a horizontal portion of the cam 112 so that a shearing force F is applied to the first side 32 moving along the plane 42. The second side 32 remains stationary on the stationary clamping element 54, so that between the back 38 and the first plane 42, an acute angle θ is generated.

Instead of in Fig. 3 shown individual piston / cam device, other adjusting mechanisms are conceivable, for example, a two-piston device.

A reciprocating side trimming blade 60 having a knife edge 62 may be moved in the direction 64 to trim the sides of the book 30. As in Fig. 8 is shown, acting on the back 38, caused by the force FR of the blade 60 orthogonal force FN is increased, so that the risk of detachment of the envelope along wide areas of the back can be reduced.

Fig. 7 shows a plan view of in Fig. 3 shown embodiment. The edges 131 and 132 of the book 30 protrude past the clamping members 52 and 54 so that the trimmers 60, 160 can truncate the edges 132 and 131, respectively.

The clamping member 54 may also be formed as a moving conveyor. To produce the chamfer, however, a relative movement between the clamping elements 52 and 54 is necessary.

Fig. 5 shows a second embodiment of the clamping device according to the invention, which has a first clamping element 82 with a clamping attachment 182 and a second clamping element 84 with a clamping attachment 184. The clamping elements 82, 84 may be formed as arms, which clamp the book in a first movement and are then displaced relative to each other, so that a differential movement is produced, which generates the shearing force F.

Fig. 6 shows a further embodiment of the present invention, in which the clamping device according to the invention comprises a first clamping member 92 moving in a first direction 72 and a second clamping member 94 moving in a direction 74. The directions 72 and 74 may be identical; In this case, the clamping element 94 would move slower than the clamping element 92. The clamping elements 92, 94 may thus be formed as a moving conveyor belts, which act on the sides 32 and 34 with a frictional force.

As a "book" is here any kind of collection of sheet material with a back called. "Clamp" means any type of element that applies a frictional force to the side of a book, moving the page of the book.

List of reference numbers

30

book

32

first book page

34

second book page

36

sheet material

38

move

39

adhesive

42

first floor

44

second level

50

clamping device

52

first clamping element

53

movement direction

54

second clamping element

55

Rod

57

movement direction

60

trimming knife

62

knife edge

64

movement direction

72

movement direction

74

movement direction

82

first clamping element

84

second clamping element

92

first clamping element

94

second clamping element

100

piston

105

cam follower

112

cam

131 1

book edge

132

book edge

160

trimming knife

182

clamp mount

184

clamp mount

F

shearing

FN

orthogonal force

FR

knife force

FN

orthogonal force

FR

knife force

F

shearing

θ

angle

Claims (7)

1. Process for producing a profiled spine in a book (30) having a first page (32) that forms a first plane (42), a second page (34) that forms a second plane (44) and a spine (38), characterised by the following steps:

   clamping the book (30) in position by means of a first clamping element (52) in contact with the first page (32) and a second clamping element (54) in contact with the second page (34); and

   moving the first clamping element (52) relative to the second clamping element (54) in order to bevel the spine (38) by moving the first page (32) in the first plane (42) and/or the second page (34) in the second plane (44).
2. Process according to claim 1, characterised in that the bevelled spine (38) is trimmed.
3. Process according to claim 2, characterised in that the book (30) is arranged horizontally for trimming.
4. Process according to claim 2, characterised in that the first page (32) is cut using a blade (60) and the first page (32) is arranged at an acute angle (θ) to the spine (38).
5. Process according to claim 2, characterised in that the book (30) is trimmed by two blades (60, 160) at two edges (131, 132), the first element (52) being located between the two blades (60, 160).
6. Process according to claim 1, characterised in that both the first and the second clamping elements (52, 54) move.
7. Clamping device (50) having a first clamping element (52, 82, 92) and a second clamping element (54, 84, 94) for clamping a bound book (30), characterised by a positioning device for moving the first clamping element (52, 82, 92) relative to the second clamping element (54, 84, 94), in order to apply a shear force (F) to the pages (32, 34) of the book (30).

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