EP1178890B1 - Method and device for adhesive binding a set of sheets of books, book blocks, booklets and the like - Google Patents

Abstract

In order to adhesively bind a set of sheets of book blocks, booklets and the like, the inner book (6) is inserted in a clamping device (7-11) with the back facing downward and received by a holding device that can be moved horizontally and perpendicularly in relation to the plane of the block. The adhesive is applied onto the backs of the blocks from the bottom by a press on device by means of an adhesive pad (17). The adhesive pad is impinged upon by the press on device in such a manner that the back of the book forms a set of sheets on one side and then on the other side by exerting pressure while adhesive is imultaneously applied on the back of the book forming the set of sheets (FIG. 1).

Description

The invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 10.

Fan binding is currently used for small series or single volumes made that the sheet stack, e.g. a book block, clamped and manually on Brush the back with a brush with liquid glue. This method has the Disadvantage that it is time consuming and that the glue applied from the top will flow into the spaces between adjacent sheets, creating marginal areas these sheets become smeared, and too much glue is consumed.

The object of the invention is to rationalize this purely manual adhesive binding and to perform mechanically, to accelerate, the adhesive consumption reduce, and not only perform a fan tape binding at a higher speed, but also a much more stable and long-term long-term connection for reaching the bound products. The object of the invention is also the setting the width of the spine of a book block or the slope for hard covers, which are rounded, to clearly define.

According to the invention, this is with the features of the characterizing part of the claim 1 and claim 10 achieved. Further embodiments of the invention are the subject of subclaims.

The product to be bound by fan gluing, hereinafter referred to as "the Book block "is clamped in a conventional manner so that the cut sheets and the block back the fixed assignment required for the gluing process maintain each other. The clamped book block is clamped firmly and from below a cushion soaked in adhesive or an adhesive application plate is placed underneath Pressure against the block back. Then the block back Pressed adhesive pads in a direction perpendicular to the sheet plane of the block moved and simultaneously lifted or tilted on one side, so that the block back from the horizontal to an inclined, inclined position and at the same time that Pillow is moved lengthways. As a result, the individual sheets of the Sheet stack fanned out in the back area, making a defined section smaller Width for the admission of adhesive is released. Such a walking and massaging interaction between book spine and adhesive cushion leads to that targeted adhesive on a larger, precisely limited area of the single sheets in the Back area of the block applied and thus the surface provided with adhesive enlarged and the effectiveness of the adhesive bond is significantly improved.

This process of further developed fan-bonded binding is carried out mechanically; the clamping and clamping of the book block is done just like that Moving the adhesive cushion and fanning out the block back by pushing the rod, with either machine or manual drive, and can in particular Be part of an overall system in which this process is integrated as a building block around one to ensure the automatic execution of a binding process or a production line, So the automatic feeding and clamping of the book block, the hanging of the Book block into the block clamping device, opening and closing this clamping device, the longitudinal movement, lifting, tilting of the adhesive cushion, each set on the format and thickness of the book block, and removing the Book block after the binding of the fan has ended and the removal of the insofar finished book block and feeding a new book block.

In a further embodiment of the above-described fan adhesive binding is according to the Invention proposed, the bound so far obtained by fan bonding Book block by further editing that on the block spine and the on a backing is applied to the back side sections, which is in shape a paper, tissue or similar strip is formed with dry adhesive, and which is applied under pressure to the fan bond while the edges of the felling pressed against the side sections of the block and by exposure to heat connected or sealed together. The fellings are e.g. on one Fabric tape provided individually as a carrier or fed automatically, so that too this process step is used as a building block in an automatically operating binding plant and can be integrated. In the case of a mechanical system, the Felling fed continuously continuously, each cut into the desired shape and positioned, lifted, and pressed on a printing table.

The device for performing the above-described method is manual actuated or motor-driven device that trained to work automatically be and used as a component in a larger overall system can to ensure an automatic process of the entire system. The prepared clamped book block is (by hand or automatically) in a clamping device introduced, on which the two-sided terminal strips rest. The jig is connected to the frame of the device and to different block thicknesses adjustable. The actuation of this adjustment can e.g. over rods by hand or done via motor drive. The back of the book block that is free down protrudes from the tensioning device, is arranged above an adhesive application device, which consists of a tub and an adhesive pillow accommodated in it The tub is vertically movable, longitudinally movable and tiltable to the adhesive cushion, so that by appropriate drive movement (manually or via drive motor) a shift in the horizontal, a movement in the vertical and tilting can take place in both directions. The movements are made over a backdrop, the course of which e.g. over control rollers onto the tub and the adhesive pad inside is transferred.

An adhesive supply is connected to the tub, which keeps the adhesive cushion in place with sufficient glue. The adhesive is a wet dispersion adhesive, which is taken up by the felt cushion in the tub, so that the surface of the Pillow, which faces the underside or the back of the book block, always in is sufficiently available; the felt pad will if the device is not in Operation is closed with a cover sheet or cover plate, so that the device is always operational and adhesive is available on the top of the pillow, if the cover film or cover plate is removed.

The above-described device for fan-binding book blocks or the like. is supplemented according to the invention by a further device or additional device, with the help of a fold in the form of a tissue, e.g. Linen strips with glue can be mechanically applied to the book block or the like. Such a thing Felling can also take the form of a continuous cardboard envelope, for example his. The book block bound by fan gluing is clamped in Condition used in the manner described above in a jig, below which a vertically movable pressure plate is arranged on which a fabric or other Fabric web rests, which is silicone-coated on the top. On this track an adhesive strip made of a fabric-like material applied to the block back; the top of the adhesive strip facing the block back has one Dry glue layer on. The adhesive strip is around the two edges of the block back turned over so that it was the lower section of the two opposite Side walls of the book block covered.

A heating strip is brought into contact with each of these two side sections, which heats the adhesive of the adhesive strip and a connection in a kind of sintering process with the adhesive of the block back as well as a strong connection with the two opposite cover pages of the book block. The felling follows Completion of the heating process an extremely firm connection between the felling and the book block. It is crucial that the wet dispersion adhesive for the binding of the book spine and the dry dispersion glue of the folder are matched to one another for optimal connection and sintering to achieve between the two. The device for applying a Folds on book blocks, brochures, continuous cardboard envelopes or other Sheet stack requires an additional facility to the fan adhesive binding facility, so that both of the above-described devices are building blocks in an overall system or production line and both the fan binding as well the felling binding can be designed so that an automatic mode of operation and automatic feeding of the binding elements and coordinating the work processes include.

Instead of the drive movement for the adhesive application device via a mechanical To set the gate control, this drive movement is within the scope of the present Invention with a movable container wagon on mechanical, preferably pneumatically, if necessary hydraulically via appropriately controlled Drive cylinder as a lifting movement, or also carried out electrically.

The adhesive container is moved on rollers and one as a rocker arm or rocker trained inclined plane raised at one end of the stroke about a tilt axis is tilted so that the adhesive container on the rocker arm moves downwards and returns to the starting level. Then the rocker arm or the rocker is automatically tilted back to the starting position by the spring force and the Adhesive container in the starting level to the opposite point above the Move the rocker arm out and then onto the inclined plane of the rocker arm on the opposite side, so that the working cycle described above is repeated becomes. The adhesive cushion can be moved into a parking position on this opposite side in which the tub is automatically sealed airtight by a cover so that the adhesive does not dry out during the parking period. To this Thus, the adhesive in the adhesive pad cannot dry out, and the adhesive pad is ready for use at any time.

The embodiment described above is for a manual or motor controlled Operation designed. For automatic actuation, especially on pneumatic Ways, the same trolley or container is preferably in principle a scissor lattice arrangement mounted and runs on rollers that run in rails so that the relative movement with respect to the book block spine for application of the glue or adhesive can be carried out. To apply the adhesive the adhesive pad under the book block is raised and pressed against the book block, the book block spine taken along, bent over, fanned out and Glue is massaged into it. At the turning point of the fanning out, the container lowered with the adhesive cushion and move back to the center. The same Working game is carried out on the opposite side. The lifting movement is e.g. pneumatic or by motor, the forward movement is preferably carried out by motor. Cylinders are articulated to the container holding the adhesive pad, which cause the glue cushion to tilt when the container is lifted, so that the glue cushion lies well when the book block is fanned out and one optimal adhesive absorption is achieved.

With such a drive movement, the adhesive pad inside the tub pressed against the spine, both upwards and to the side; with this lateral movement, the paper stack is in the position where the guide rollers reverse their direction of movement, compressed. Doing the recording hindered by adhesive at this compression point, so that a perfect adhesive application is no longer guaranteed. To avoid this disadvantage, the one described above Guide of the adhesive tub with the rollers on both sides on one Swivel lever made and during this swivel movement of the adhesive transferred to the spine and massaged.

With the method according to the invention or the devices according to the invention becomes a perfect binding for book blocks in an extremely simple and cost-effective way, Brochures, but also cardboard envelopes, which have a high durability and The strength of the products bonded in this way ensures the current adhesive bonds are decisively superior, both in terms of strength, durability as well as costs.

Fig. 1

eine schematische Darstellung einer Seitenansicht der Erfindung zum Fächerklebebinden,

Fig. 2

eine schematische Frontansicht der Einrichtung nach Fig. 1,

Fig. 3

eine schematische Aufsicht auf die Einrichtung nach Fig. 1,

Fig. 4

eine Seitenansicht der Wanne mit Klebstoffkissen,

Fig. 5

eine Detailansicht der Halterung und Einstellung für den Buchblock,

Fig. 6

eine Detailansicht einer Fächerung des Buchblockrückens,

Fig. 7

eine Einrichtung zum Aufbringen eines Fälzels auf den Buchblock in schematischer Seitenansicht,

Fig. 8

eine schematische Frontansicht der Einrichtung entsprechend Fig. 7,

Fig. 9

eine abgeänderte Ausführungsform der Anordnung nach Fig. 1 in Seitenansicht,

Fig. 10

eine Ansicht der Anordnung nach Fig. 9 von vorne,

Fig. 11

eine weitere abgeänderte Ausführungsform der Erfindung in Seitenansicht,

Fig. 12

eine Ansicht der Anordnung nach Fig. 11 von vorne, und

Fig. 13

eine schematische Prinzipdarstellung für eine Berechnung der Steigung.

The invention is explained below in connection with the drawing using exemplary embodiments. It shows:

Fig. 1

1 shows a schematic representation of a side view of the invention for fan-shaped binding,

Fig. 2

2 shows a schematic front view of the device according to FIG. 1,

Fig. 3

2 shows a schematic top view of the device according to FIG. 1,

Fig. 4

a side view of the tub with adhesive pads,

Fig. 5

a detailed view of the holder and setting for the book block,

Fig. 6

a detailed view of a fan of the book block spine,

Fig. 7

a device for applying a folder to the book block in a schematic side view,

Fig. 8

7 shows a schematic front view of the device according to FIG. 7,

Fig. 9

2 shows a modified embodiment of the arrangement according to FIG. 1 in a side view,

Fig. 10

9 shows a view of the arrangement according to FIG. 9 from the front,

Fig. 11

another modified embodiment of the invention in side view,

Fig. 12

a view of the arrangement of FIG. 11 from the front, and

Fig. 13

a schematic diagram for a calculation of the slope.

A cuboid frame 1 with a housing consists of front and rear vertical beams 2, 3 and upper and lower horizontal longitudinal beams 4, 5. On the top of the housing is provided with a recess for inserting a book block 6, the clamping strips 7, 8 held together by the block are held be held in position on both sides by retaining bolts 9 with a catch. On the frame 1 and the upper side members 4 are parallel to the plane of the book block extending rails 10, 11 attached, which carry the terminal strips 7, 8 and on the Thickness of the book block 6 are adjustable. This setting is made using adjustment rods 12, 13 with intermediate drive pinion 14 and drive 15, for example can be a manual drive or a motor drive. The insertion of the Book block in the jig can be either by hand or machine, preferably in a fully automatic machine system.

Below the clamping device 10, 11 and the book block 6 is the adhesive application device 16 arranged an adhesive pad 17 within a Adhesive supply 18 receiving tray 19 is arranged. The tub 19 is with one Carrier 20 attached to which a pivot point 21 is formed, of which a linkage 22 leads to an actuating device 23. The actuator 23 can be a manually operated lever mounted on the frame and a motorized Drive. The carrier 20 for the tub 19 receives mounting flanges 24, 25, form the bearings for guide rollers 26, 27, which on a slide track 28 a backdrop 29, which is formed on both sides of the frame, roll. The backdrop 28, along which the guide rollers 26, 27 by actuating the linkage 22 are made up of inclined sections that rise outwards 30, 31 of the cam track, horizontal sections 32, 33 and sloping, inwards rising sections 34, 35 of the cam track. The slopes 34, 35 determine the vertical stroke of the adhesive cushion 17, the cushion firmly against this area the book block spine 6 is pressed, the horizontal sections 32, 33 determine the area where the adhesive pad is horizontal relative to the book block Direction, the book block spine is fanned out, and the sloping sections 30, 31 cause the adhesive cushion to tilt or incline 36, 37 on one side for applying adhesive to the fanned leaf ends of the block in the two opposite end inclinations.

With 38 an adhesive reservoir is shown, the frame 1 of the device is attached and from which an adhesive line 39 leads to the tub 19.

4, the tub 19 is shown in more detail. She takes the adhesive pad 17 to stiffen Bolts 40 in the tub so that the cushion 17 within the tub 19th is set. The cushion 17 dips into the glue supply 18 inside the tub, and is soaked with glue so that the top of the pillow 17 is always glued is busy and ready for use. A cover sheet 41 is used when the pillow is not needed is placed over the cushion surface and the case so that the adhesive on the Surface does not dry in the air, but always ready for use when removing the film is. It is therefore not necessary to clean the pillow after use.

Fig. 7 shows a device with which processed by fan tapes Book block a fold 44 on the back of the book block in a separate operation 43 and the subsequent page sections of the book block is applied. A corresponding device has a similar arrangement of a book block analogous to FIG. 1 with terminal strips 7, 7 'and holding rails 10, 11 for receiving the terminal strips on. Instead of the adhesive pillow with a backdrop control is in this facility a book block 42 already provided with a fan-bond is provided, on the end face 43 a fold 44 is applied, which has an adhesive strip Owns dry glue.

The adhesive for the fan bond and the dry adhesive on the folder are coordinated so that an optimal bond is achieved when the edge elements of the fold over heating strips 45, 46 to the lower side ends of the book block 42 and in the area of the book block spine 43 the fold 44 over the printing plate or table 47 are pressed so that the dry glue of the felling and the Adhesive of the fan bond bind a sintered connection with each other receives an extraordinarily high strength. The adhesive strip that forms the fold 44 is placed on a carrier web 48 made of fabric with a silicone coating placed on the top and on the table 47 to the job immediately below brought the book block spine 43 and then pressed from below. The fellows can to carry out a continuous perfect binding process automatically to the gluing point introduced, cut there if necessary and in time with the insertion of the book block are provided, so that this facility in an automatic Bindestrasse can be integrated.

In the embodiment according to FIGS. 9 and 10, the book block 50 is in clamping devices 51, 52 clamped. The back of the book block 50 becomes for positioning and for the adhesive application via a pressure device 53 from below applied; the pressing device 53 consists of a parallelogram-like system of levers 54, 55, 56, which after aligning the book block 50, as in the Drawing shown, is folded down or pivoted.

The carriage 57, which holds the adhesive container with the adhesive pad, is shown in FIG. 9 shown in dashed lines on the book block, in a position in which the book block fanned out to the left. In the guide path of the car 57 are left and right each shown a rocker or rocker arm arrangement on which the carriage 57 boots up. When the carriage 57 has passed the dead center position, the rocker tilts or the rocker arm, the car moves down the inclined plane, the seesaw or the rocker arm automatically as soon as the car has left the rocker Spring force is returned to the starting position, and the carriage 57 is opened move the opposite side, where the work cycle is on the rocker or the rocker arm 59 is repeated, so that the car as a whole in a closed Track passes over the two rockers 58, 59 one after the other.

After passing rocker 59, the carriage can be put into a rest position (right side) be driven in a lid 60 over the open glue container of the car 57 is closed, so that the adhesive dries during the rest phases operation is prevented. With 61 the drive for the carriage 57 is shown, the Rollers of the carriage 57 are designated 62 and the track on which the Carriage is moved, with 63. In the embodiment of FIG. 9, the movement of the car guided by hand or by motor drive depending on the circumstances of the company and the size of the system.

Automatic operation becomes with the embodiment shown in Figures 11 and 12 achieved. Here, the carriage 57 is fastened to a scissor lattice arrangement 64, which is height adjustable via lifting cylinders 65, 66 and lifting rods 67, 68, so that the carriage 57 with the adhesive container for fanning out the book block back perform a simultaneous vertical movement for a horizontal movement and thus can apply the adhesive to the back of the book block.

The arrangement according to FIG. 11 differs from that according to FIG. 9 essentially in that an automatic movement of the adhesive container compared to a manual movement, and thus an automatic process is achieved.

For the exact manufacture of hard covers that are rounded on the back during application of a fold on the spine, the slope of the book block spine becomes the Stack height a of the book block and the back supplement of 2 x 2 b (2 x cardboard thickness) and a surcharge between 0 and 15% calculated. With a stack height of e.g. 30 mm and one Back allowance from e.g. 2 x 2 = 4 mm cardboard thickness results in a total thickness of 34 mm. If a surcharge of 15% corresponding to the rounding of the spine factored in, which corresponds to 5.1 mm, the back width is 39.1 mm. With The required slope can be set using this value.

LIST OF REFERENCE NUMBERS

1

Frame with housing

2, 3

front and rear vertical straps

4, 5

upper and lower horizontal beams

6

book block

7, 7 '

Terminal strips that hold the block together

8, 8 '

Hold-down device for the terminal strips

9

Holding bolt with catch

10, 11

Rails that hold the terminal strips 7, 8 and on the Book block thickness are adjustable

12, 13

Adjusting rods for the horizontal displacement of the rails 10, 11

14

pinion

15

drive

16

Adhesive application device

17

adhesive pad

18

adhesive supply

19

tub

20

carrier

21

articulation

22

linkage

23

actuator

24, 25

mounting flanges

26, 27

Carriers, leadership roles

28

link path

29

scenery

30, 31

sloping sections of the backdrop that rise outwards

32, 33

horizontal sections of the backdrop

34, 35

sloping inward sections of the backdrop

36, 37

Inclinations of the spine of the book block

38

Adhesive reservoir

39

adhesive line

40

stiffening bolts in the tub to hold the pillow

41

cover

42

book block

43

Front side with fan adhesive

44

Slip-Fold

45, 46

Heating strips on both sides

47

Table top, can be raised and lowered

48

Carrier tape for folding strips

50

book block

51, 52

clamping device

53, 54, 55, 56

pressure device

57

dare

58, 59

Rocker or swivel lever

60

Lid for container cover in the rest position

61

Drive of the car 57

62

castors

63

runner

64

Concertina arrangement

65, 66

lifting cylinder

67, 68

lifting rods

Claims (22)

1. Process for the fan-type adhesive binding of book blocks, brochures and the like by virtue of the book block being clamped and adhesive being applied to the block spine, the book block being inserted into a clamping arrangement, and clamped firmly, with the block spine downwards and being accommodated by a retaining arrangement, which can be displaced horizontally, and at right angles to the block plane, with the aid of an actuating arrangement, characterized in that

   a) the adhesive is applied to the book-block spine from beneath, by way of a pressure-exerting arrangement, with the aid of an adhesive pad,

   b) the adhesive pad is arranged in a container which is subjected to the action of a pressure-exerting arrangement such that the book-block spine is fanned out under the action of pressure to one side and then to the other side and, at the same time, adhesive is applied to the fanned-out book-block spine, and

   c) the pressure-exerting arrangement is controlled such that the tray for the adhesive pad is made to move with tilting/inclining action.
2. Process according to Claim 1, characterized in that the container with the adhesive pad, for executing the tilting/inclining movement, with the adhesive pad pressed onto the book-block spine, is displaced to the two lifting positions one after the other on slanting planes in the form of rockers, the respective rocker is tilted once the dead centre has been passed, and the container, once the starting plane has been reached, is displaced back and displaced to the opposite rocker in the same operating cycle, and the rocker-forming tilting lever is guided back into the starting position again in each case by means of spring force by hand or automatic control.
3. Process according to Claim 2, characterized in that the container accommodating the adhesive pad, on the far side of the rocker, is moved into a parking position in which the container with adhesive pad is closed in an airtight manner by a covering and the glue or adhesive is thus prevented from drying out.
4. Process according to one of Claims 1, 2 and 3, characterized in that the container accommodating the adhesive pad and also the guide rollers of the container are coupled with a shear-type lattice arrangement, and the container is connected on both sides to lifting cylinders via which the container is tilted.
5. Process according to Claim 4, characterized in that the lifting cylinders are actuated pneumatically, hydraulically or electrically, and in that the lifting and tilting movements of the container are executed automatically.
6. Process according to one of Claims 1 - 5, characterized in that the pressure-exerting arrangement subjects the adhesive pad and the book-block spine to a squeezing or a massaging movement.
7. Process according to one of Claims 1 - 6, characterized in that the adhesive used for the adhesive pad is a wet dispersion adhesive.
8. Process according to Claim 1, characterized in that, in a separate apparatus or in an additional apparatus, a guard, which has a dry adhesive, is applied to the book-block spine produced by fan-type adhesive binding, and in that the side sections of the guard are heat-sealed to the book block with the aid of heating bars.
9. Process according to Claim 8, characterized in that the individual guards are transported to the guard-applying location on a slide with a table-like pressure plate, the guard being raised and pressed against the block spine.
10. Process according to Claim 8 or 9, characterized in that a band or cloth, which accommodates the guard, is arranged on the slide with a pressure plate.
11. Process according to one of Claims 1 - 10, characterized in that the fan-type adhesive-binding steps, namely fitting in the book block, pressing the adhesive pad onto the book-block spine and massaging the adhesive into the fanned-out spine of the block, this operation taking place by guide control, are integrated in an automatically operating book-binding installation.
12. Process according to Claim 11, characterized in that the step of applying the guard to the book block by heat-sealing via heating bars is integrated in an automatically operating book-binding installation.
13. Apparatus for the fan-type adhesive binding of book blocks, brochures and the like, having a clamping arrangement for clamping the book block and an arrangement for applying adhesive to the block spine, in the case of which the clamped book block or the like is arranged between two carriers, adjustable horizontally in relation to one another, and can be secured in the operating position, characterized in that

    a) arranged beneath the book block is an adhesive pad which can be displaced in a direction transverse to the plane of the book block and can be raised under pressure against the book-block spine,

    b) a drive arrangement drives the adhesive pad in a combined horizontal and vertical movement such that the adhesive pad applies adhesive to the block spine from beneath and the pad subjects the book-block spine to a squeezing or massaging movement, and

    c) the vertical movement of the adhesive pad or of the adhesive-pad carrier takes place by means of an arrangement which produces a tilting/inclining movement, e.g. a guide control means, and the horizontal movement of the adhesive pad takes place by means of a linkage, by hand, or by means of a motor drive.
14. Apparatus according to Claim 13, characterized in that the adhesive pad is arranged, and secured, in a tray, a continuous flow of adhesive takes place via an adhesive supply container fastened on the frame, and the pad, at rest, is covered by a sheet material.
15. Apparatus according to either of Claims 13 and 14, characterized in that the adhesive pad consists of felt or similar, absorbent material of firm consistency.
16. Apparatus according to Claim 13, characterized in that a squeezing movement of the pad comprises a movement which follows the guideway and runs in a horizontal and an oblique plane, and in that the oblique course of the movement in the two horizontal directions causes the end surface of the block to be fanned out in opposite directions, such that the fanned-out sheets produce a greater surface area for the application of the adhesive.
17. Apparatus according to one of Claims 13 - 16, characterized in that the clamping bars of the book block are positioned on rails in the framework, it being possible for said rails to be displaced relative to one another, and can be secured on the rails from above by holding-down means so as to produce a counterpressure against the upward pressure to which the book block is subjected from beneath.
18. Apparatus according to Claim 14, characterized in that the adhesive tray has stiffening pins which accommodate and position the adhesive pad, in that there is maintained in the tray an adhesive supply which keeps the adhesive pad impregnated at all times, and in that, when the apparatus is at rest, the adhesive pad is covered by a covering sheet material drawn over the tray and is kept ready for operation.
19. Apparatus according to Claim 13, characterized in that

    a) arranged beneath the book block is a guard which is wider than the book-block spine and has a dry layer of adhesive on the surface directed towards the block spine,

    b) the guard, assigned to the book spine, is positioned on a table which can be moved upwards under pressure against the book-block spine, with the result that the guard is pressed onto the book-block spine, and

    c) the projecting side sections of the guard are assigned heating bars which are arranged on both sides and cause the side sections of the guard to be pressed on and heat-sealed.
20. Apparatus according to Claim 19, characterized in that a continuous cardboard cover is provided instead of a strip-like guard.
21. Apparatus according to Claim 19, characterized in that provided on the table top is a material web which is silicone-coated on the top side, and in that this material web accommodates guards which are positioned for connection to the book block.
22. Apparatus according to Claim 21, characterized in that provided for a continuously operating binding installation is a continuous guard-feed arrangement which, in time with the book-block insertion, feeds a guard to the book block in each case.

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