Clamp release system for a machine for producing perfect-bound printed products

Abstract

To provide a machine-integrated clamp opening system which can continuously load book blocks of same or different dimensions into individual each binder clamp during a cycle according to a prescribed production speed before the binder clamp annexed to a clamp chain passes individual processing station of a machine, that is, a perfect binding machine along a prescribed rotation track.SOLUTION: At a book block loading position, clamp external means (355, 356) realizes scheduled opening of a clamp jaw (151) annexed to a binder clamp (101) depending on a thickness of a book block to be accommodated by a pressing operation for movable clamp internal means (350), a reaction force by a spring, which has received a preload, is configured by the pressing operation, and this reaction force can be realized in a current cycle as a pressing force on the accommodated book block.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to an opening system for binder clamps in a machine, preferably a perfect binder, for producing perfect-bound printed products, i.e. book blocks, according to the respective scope of protection of the claims.

[0002] The present invention relates both to a clamp opening system integrated into a machine and to a method for operating such a clamp opening system, but the scope of protection of the invention also extends to identical or similar clamp opening systems that can be arranged in different positions on the machine depending on the type of operation.

[0003] In this case, the binder clamps are arranged along a clamp chain which rotates continuously, and the binder clamps loaded with book blocks pass through the individual processing stations of such a perfect binder. [Background technology]

[0004] In known perfect binders, the clamps, i.e. their clamping jaws, are opened and possibly closed by fixedly arranged cams operatively connected thereto, even if no direct return spring device is available, which means that the clamping jaws of each clamp are opened to the same value during the production of book blocks of the same thickness.

[0005] For this purpose, the designated clamps are covered by rollers running along an inclined angle attached to the connecting links, which, by the transmission of the traveled path, introduce a translational movement that provides the predetermined opening of the clamp jaws. These locally arranged connecting links are set in the form of elongated flaps, so that the connecting link itself can cover several clamps at once.

[0006] If a single production of book blocks is followed by a new production with a different book block thickness, the prior art perfect binder must first be completely emptied before the new production is introduced. The connecting links are then set to the new thickness of the book blocks to be processed, and then a corresponding new setting of the clamps and the connecting links operatively connected to the clamps is made.

[0007] Since the clamp jaws of each clamp are set to the same opening, the opening dimension for each book in BVD mode (Buch Dicken Varianz: variable book thickness) cannot be optimally achieved, since the opening of all clamps can no longer be set specifically for the book block thickness.

[0008] Another weakness in the operation of perfect binders known from the prior art is that the position of the clamps can be subject to undesired movements for different reasons during operation, and currently no preventative measures are known in the prior art to continuously monitor the positioning of the clamps so as to be able to intervene by adaptation in the event of tolerances being exceeded.

[0009] Thus, each clamp opens to its maximum extent during each cycle, thus allowing for the full return displacement resulting from the opening to its original position. This precaution obviously involves a time delay, since multiple revolutions of the clamp chain are required depending on the desired opening width of the clamp jaws before the intended opening of all clamps in the system is achieved.

[0010] With each opening and closing of the individual clamps, the connecting links exert an internal force on the clamps, the resulting force components being directed in opposite directions along the transport path. The resulting impact on the clamps during the opening process causes a swinging movement in the clamp chain, which causes speed changes that adversely affect the accuracy of the book block when positioning its cover at the processing station in question. These repeated impacts due to collisions can slowly or quickly adversely affect both the positional accuracy of the glue application to the spine of the book block and the accurate processing of the book block itself along the other processing stations of the perfect binder.

[0011] From EP 1 688 269 A1, a book block clamp for clamping and transporting book blocks in a book block processing machine is known, which essentially consists of an inner clamping jaw with an outer clamping jaw arranged parallel to and movable relative to the inner clamping jaw, which applies a clamping force to the book block via a drive means and a force transmission means.

[0012] The outer clamping jaw has a support element that is pressed against the outer clamping jaw by a compression spring. The compression spring is located at the extended end of the guide rod and is supported between a shoulder of the guide rod and the outer clamping jaw. A cam roller is rotatably supported at the end of the guide rod and is operatively connected to a control cam. Without the action of the control cam, the support element abuts against the outer clamping jaw.

[0013] The progression of the cam roller along the control cam provides a spaced parallel position to the outer clamping jaw. In another clamping phase, the outer clamping jaw is pressed against the book block to be clamped. In this case, the support element remains at a set distance from the inner clamping jaw until it abuts against the outer clamping jaw or its clamping plate and is moved inward to clamp the book block therewith. In this case, the cam roller is lifted off the control cam.

[0014] The opening width for feeding the book block is set via the distance of the control cam relative to the inner clamping jaw. The control cam is connected to the closing cam of the outer clamping jaw, and the distance of the control cam relative to the closing cam can be set. The reduction in the opening width is made depending on the difference in thickness between the clamped and unclamped book block. For thick book blocks, only a small reduction in the opening width determined by the closing cam is necessary, but for thin book blocks, a significant reduction must be made by reducing the distance of the control cam relative to the closing cam and controlling the support element inward by the control cam.

[0015] The ability to move the control cam along the transport direction of the book block clamp allows for a simple adjustment of the time for reducing the opening width, which can be introduced as soon as the leading corner of the book block has entered between the clamp jaws, i.e. this adjustment is made depending on the book block format with regard to height and width.

[0016] The control cam has an entrance section with a variable cam stroke that can be set to the degree of opening width reduction. The entrance section consists of an elastic carrier that is rigidly connected to the control cam, and this carrier is connected at its end side to the arm of the closing cam. The bending line of the variable carrier determines the cam profile by changing the stroke, which thereby behaves without collisions and rattles and allows the cam roller to approach the entrance section of the control cam tangentially.

[0017] Another book block processing machine with clamps for clamping and transporting book blocks belonging to the prior art is known from EP 0 384 129. Here too, a control roller passes over a control cam arranged at any position in the rotation path of the conveyor in order to open the clamp jaws. [Prior art documents] [Patent documents]

[0018] [Patent Document 1] European Patent Application Publication No. 1688269 [Patent Document 2] European Patent No. 0384129 Summary of the Invention [Problem to be solved by the invention]

[0019] The present invention now enriches the prior art. The problem underlying the invention, as characterized in the claims, is to propose a machine-integrated clamp opening system, which allows each individual binder clamp to be loaded successively with book blocks of the same or different dimensions during cyclic operation according to a predetermined production speed, before the binder clamps associated with a clamping chain pass along a predetermined rotational path through the individual processing stations of the machine, i.e. of a perfect binder. [Means for solving the problem]

[0020] The clamp opening system according to the invention is therefore operated in such a way that the necessary opening of the clamp jaws associated with the binder clamps is immediately provided depending on the respective thickness of the book block to be processed, so that an individual opening can be provided depending on the respective cycle, as long as book blocks with significantly different thicknesses and formats can be gripped and fed to another process continuously and without interruptions and idle cycles.

[0021] The opening process acting on the clamping jaws of the binder clamps is therefore no longer induced via a control cam arranged stationary along the rotation path of the perfect binder, but according to the invention this opening process is detected by a locally arranged module in the form of a force-applying drive unit which induces an individual opening of the clamping jaws as each binder clamp operatively connected to the clamp internal means passes, and is therefore no longer limited to a fixed, predetermined opening depending on a predetermined control cam, as was the case according to the prior art.

[0022] Each binder clamp therefore comprises clamp internal means, preferably in the form of a movable flap, which is operatively connected, at least in the loading and unloading positions of the book block (also called loading station and unloading station), to a drive unit which exerts a locally arranged force, whereby the drive means exerts a compressive force on the movable flap guided in the binder clamp, which compressive force causes a planar movement of said flap, thereby inducing and providing the desired opening of the clamp jaws.

[0023] This flap is preferably a plate adapted for the application of forces, the length of which corresponds approximately to the extent of the binder clamp and the width of which is configured according to the free space within the binder clamp.

[0024] During this pressing process, in addition to the opening of the clamping jaws associated with the binder clamp, a counter force is also generated at the same time, preferably via spring elements, which act to process This pressing force can be used in the form of a preload depending on the spring configured after the end of the clamping operation, which can then be used to apply a clamping force to the clamped book block.

[0025] Naturally, the pressing force acting on the clamped book block can also be exerted by other adapted force-releasing units, for example by hydraulic, pneumatic or other mechanical devices or units.

[0026] In this case, another equally configured force-applying drive unit for transmitting a pressure force to the movable flap in the binder clamp is arranged at least downstream of the processing station associated with the perfect binder, where it is important to initiate the ejection (ejection operation) of the completely processed book block. Here, a force-applying drive is used in the same way as above, but the drive again applies pressure to the flap so that, starting from a given clamping state, the clamp jaws open by a further amount so that the book block can then be completely separated from the binder clamp. The empty binder clamp then moves further along the pivot path of the clamp chain to a position where a new opening kinematics is performed to accommodate the book block that will be subsequently introduced for processing.

[0027] The drive unit underlying this can be arranged in addition to these conventional positions (loading and unloading stations) at any other position along the rotation path of the clamping chain of the perfect binder, for the intermediate or early removal of quality-unsuitable book blocks from the processing process, preferably before the actual loading station of the book block, in order to produce a preliminary opening of the clamping jaws, whereupon the subsequent, additionally, final associated opening of the book block is carried out.

[0028] In order to ensure the quality of the processed book blocks during the processing process, sensors can be provided at appropriate points, which then transfer the information they detect to the main control unit of the system, which then ensures that measures are taken according to the controls to be implemented.

[0029] Therefore, additional cycle gains for the system can be achieved by detecting information obtained by sensors in front of the normal storage location of the book block and from this information deriving the effective opening of the clamping jaws of the binder clamp and, if necessary, scheduling the pre-opening described above, thereby making it possible to permanently avoid the intervention of compensatory idle cycles.

[0030] The drive unit for applying a pressure force to the flap is preferably configured as a servomotor, which has a movable lever with at least one roller on the outside, via which a specified pressure force is applied to the flap, preferably in the sense of a linear or quasi-linear force / displacement curve, although other decreasing or gradual force / displacement curves are also possible by corresponding control of the servomotor.

[0031] In principle, the force transmission effected by the drive unit can be easily achieved when the clamping jaws are opened, since the pressure on the roller side is usually along a uniformly extending pressure plane. As far as the magnitude of the applied pressure is concerned, it must be set in such a way that it simultaneously allows the formation of a potentially usable counterforce, which can be used as a pressing force for clamping the respective book block. If the pressing force potential is provided, for example, via a spring, a corresponding degree of elasticity can be used as a pressing force.

[0032] An important advantage of the present invention is that the opening of the clamping jaws can be adapted individually and successively to the respective thickness of the book blocks to be processed, even if the thicknesses of the supplied book blocks differ greatly, so that it is no longer necessary to work with idle cycles to absorb such thickness differences, which has a positive effect on the productivity of the perfect binder per unit of time.

[0033] If the differences in thickness of the book blocks to be processed are particularly large, it may be necessary in some cases to carry out a limited number of idle cycles, but a remedy for this can also be provided in this case by the alternative solution according to the invention, which consists in that the previously described preliminary opening of the clamp jaws can be activated in advance in each case upstream of the normal loading station of the book blocks.The clamp opening system according to the invention therefore enables each binder clamp to be operated in BVD mode (Buch Dicken Varianz: variable book thickness), which allows a direct adaptation of the opening to the respectively varying book block thicknesses.

[0034] Such a measure has the operational advantage of reducing the set-up time of the processing stations of the perfect binder, which consistently allows different orders to be processed consecutively without interrupting the cycle. In other words, different book block thicknesses can be processed consecutively throughout the perfect binder without having to resort to machine shutdowns or idle cycles.

[0035] Since each binder clamp is set to the respective book block thickness in the opening direction extending purely perpendicular to the conveying path of the binder clamp, there is no risk of releasing or generating interference forces on the clamp chain that would impair the positioning accuracy of the cover on the book block, for example.

[0036] In summary, the subject matter of the invention is a machine for producing perfect-bound printed products, i.e. book blocks, preferably configured as a perfect binder, essentially consisting of a rotating clamp chain with spaced-apart binder clamps, each binder clamp being operatively connected at a corresponding station to a clamp opening system, the clamp opening system comprising at least one clamp internal means and at least one clamp external means, which operate interdependently and whose operation results in the opening of clamp jaws associated with the binder clamp.

[0037] At the loading position of the book block (also called loading station), the clamp external means exerts a pressing action on the clamp internal means movable within the binder clamp, thus resulting in a defined opening of the clamp jaws associated with the binder clamp, which opening depends on the thickness of the book block to be accommodated, and as already explained above, this pressing action simultaneously constitutes a preload due to the spring, which then has direct effect as a pressing force on the book block accommodated in the current cycle.

[0038] A further development of the object of the invention then consists in supplementing this machine for producing perfect-bound book blocks in such a way that at the ejection position of the book block in the rotating clamp chain, another clamp external means is arranged, which is activated according to the same principle as before, thereby enabling the now processed book block to be ejected from the binder clamps, i.e., in such a way that the flaps integrated in the binder clamps are pressed a further distance until each opening of the clamp jaws is achieved which reliably allows unlimited release of the processed book block.

[0039] The rotating clamping chain is therefore provided with at least two clamping external means which ensure the respective prerequisites for loading and unloading of book blocks. The functioning of the clamping external means proceeds uniformly in both positions, i.e. this provides a defined large opening of the clamping jaws in the binder clamps, respectively, so that functional loading and unloading of book blocks can take place. However, if necessary, additional clamping external means can be arranged along the rotating clamping chain, which additional clamping external means can act on the respective binder clamps according to the same criteria as above, with a different operational arrangement.

[0040] Basically, as already mentioned above, the clamp outer means are configured as a group of independent drives acting in the plane of the clamp inner means and consist of drive units for electrically actuated levers, each of which has at its end at least one roller as pressure means.

[0041] By pivoting the lever associated with the drive unit, the roller presses against a linear guide on the outside of the clamp outer means formed as a flap, which generates a pressure stroke that results in the desired opening of the binder clamp. This pressure movement on the flap takes place as soon as the binder clamp is at the height of this drive group, and is maintained completely within each cycle, within the time available for functional loading and unloading of the binder clamp by the book block.

[0042] The pressing force realized by the clamp external means (i.e., responsible for the force for operating the clamp internal means, i.e., the flaps, provided by the drive group) is always directly proportional to the pressing force to be configured, which can be used to securely fix the book block in a frictional engagement manner, insofar as the pressing force realized on the book block can reliably absorb the processing forces occurring at the individual stations.

[0043] As already explained above, the arrangement of the pressing force on the book block is preferably provided by a spring force, however, this does not exclude that such pressing force can also be provided by a controlled mechanical, pneumatic or hydraulic mechanism, as already explained above.

[0044] Usually, the loading position of the book block is arranged upstream of the processing station of the machine operating in the direction of rotation of the clamping chain, and the discharge position is arranged downstream thereof. In particular, when an intermediate opening of the clamping jaws is carried out prior to the normal loading position of the book block, this opening introduced prior to the loading position is fixed by a holding mechanism until the normal opening rate is achieved.

[0045] The present invention relates to a method for operating a machine for producing perfect-bound printed products, i.e., book blocks, which essentially consists of a rotating clamp chain with spaced-apart binder clamps. Each binder clamp cooperates with a clamp opening system, which consists of at least one clamp internal means and at least one clamp external means, which are operatively connected to each other. The operative interdependence of these means enables the opening of the clamp jaws associated with the binder clamp. In the loading position of the book block, the clamp external means, preferably stationary, performs a pressing action on the movable clamp internal means within the binder clamp, thereby enabling the appropriate opening of the clamp jaws associated with the binder clamp depending on the thickness of the book block to be accommodated. At the same time, this pressing action generates a counter force, which is realized as a pressing force on the accommodated book block during the current cycle and which is always available as soon as the flap leaves the reach of the force-applying drive device described above.

[0046] The present invention also relates to a method for operating a machine for producing perfect-bound printed products, i.e., book blocks, which machine essentially consists of a rotating clamp chain with spaced-apart binder clamps. Each binder clamp is operatively connected to a clamp opening system, which consists of at least one clamp internal means and at least one clamp external means, which are operatively connected to each other. The operative interdependence of these means additionally influences the opening of the clamp jaws associated with the binder clamp. This implementation is effective if, in the ejection position of the book block, the clamp external means is acted upon by a further pressing action on the already established counterforce, thereby generating an additional opening that allows the clamped book block to be released. As soon as the flap again leaves the area of ​​influence of the force-applying drive described further above, the clamp jaws of the binder clamp are completely or partially closed.

[0047] The rotation of the equipment, i.e. the clamping chain, is extended, if necessary, by at least one further clamp opening system, which acts locally on the binder clamps when different preventive measures are implemented, thus, for example, when early removal of quality-defective book blocks from the production process becomes necessary.

[0048] Such a (third) clamp opening system, which operates according to the same principle and with the same progression as in the loading and unloading stations, is then preferably arranged before the book block loading station in order to introduce a predetermined opening of the clamp jaws associated with the binder clamps, in which case this opening rate is temporarily or continuously fixed by a holding mechanism, which is then released, for example, by the introduction of a sufficient opening during the book block loading process.

[0049] The retention mechanism preferably comprises a ratchet and a movable detent operatively connected to the ratchet, which ensures locking of the clamp jaws in place.

[0050] In the following, the invention will be explained in detail with reference to the drawings, in which all elements that are not essential for a direct understanding of the invention have been omitted, and the same elements are provided with the same reference numerals in the different figures. [Brief explanation of the drawings]

[0051] [Figure 1] Prior art perfect binder [Figure 2] Prior art locomotion kinematics during binder clamp opening [Figure 3] Schematic arrangement according to the invention for opening binder clamps [Figure 4] Binder clamp correction section with integrated movable flap [Figure 5] Works with the torsion spring retention system set for preload [Figure 6] Another view of the retention system shown in Figure 5 [Figure 7] Detailed structure of the binder clamp around the unit that introduces insertion depending on the operation of the flap DETAILED DESCRIPTION OF THE INVENTION

[0052] A typical high performance perfect binder belonging to the prior art is shown in Figure 1. In order to avoid unnecessary repetition, reference is made to EP 3141398 A1.

[0053] FIG. 2 shows a diagram of a prior art closing system of binder clamps attached to a perfect binder, which is operated as a machine for producing perfect bound printed products, also called book blocks in the following.

[0054] The following describes a prior art perfect binder and its operating method: the fixed part of the binder clamp 100 is guided by a chain along a path defined by the binder binder, the movable part of the binder clamp exerts an inner dynamic relative to the fixed part, which causes an orbital movement perpendicular to the binder clamp 100 in both directions of travel 140 / 150 of the binder clamp in relation to the loading and unloading positions of the book block. The inner dynamic movement underlying the opening and closing of the binder clamp is operatively coupled to a central torsion spring, the preload of which is configured in each operating position, and the resulting potential spring load is then available for the frictional engagement to be exerted in order to secure the introduced book block.

[0055] In the prior art, there are retention systems (FIGS. 5 and 6) that can be switched on and off at different fixed time intervals during the operation of a perfect binder. 6 If a retaining system (see item 170 of this application, which is specifically designed for binder clamps according to the present invention) is provided, the binder clamp can be set open during part of its operation.

[0056] Essentially, the detents of the system, once locked, absorb the force of the preloaded spring and cause the binder clamps to assume a predetermined open position (see the open binder clamps associated with the book block 200 positioned in this FIG. 2). The detents themselves are preferably spring loaded, so that when locked, the detents can assume a set position by frictional engagement. This means that such detents cause the binder clamps to not immediately close, respectively, under the action of the configured torsional spring force until the detents are in the locked position. Thus, such locking allows the binder clamps to remain "open" for part of their travel.

[0057] The opening or closing systems of binder clamps described in the prior art (which operate after locally defined opening and closing within the operation of the perfect binder) provide a uniform opening rate of the binder clamps, which is indicated by a fixedly provided connecting link (see below). Therefore, it is not possible to achieve a change in the opening rate from one binder clamp to the next with such a system using a predetermined connecting link.

[0058] 2, a more detailed view of the binder clamp opening and closing system can be seen. Two connecting links 110, 120, which set the opening, i.e., the inlet connecting link (inlet connecting link 110) and the outlet connecting link (outlet connecting link 120), are operatively connected to the binder clamp 100 passing by, thereby realizing openings designed for different operational purposes. In normal cases, the binder clamp operates according to predetermined opening and closing rates.

[0059] The two connecting links 110, 120 always occupy a fixed position relative to the binder clamp 100 passing by them. As already indicated, the connecting links 110, 120 are of a fixed structure here, so that different openings must be made for different book block thicknesses, which can be set by different positions of the connecting links or generally achieved by corresponding connecting links.

[0060] As already explained above, each binder clamp has a predetermined opening at its respective loading point. This means that in such a case, if the opening is not sufficient for a given book block thickness, this can only be corrected by adapting the connecting links 110, 120 that set the opening. Therefore, no further opening rate can be achieved beyond the maximum possible opening for a given connecting link that determines the opening.

[0061] The inlet connecting link 120 remains in place during the closing process following the introduction of the book block 200. The binder clamp is provided with a stationary cam roller 130 on the side of the inlet connecting link, which cam roller scans the front edge of this connecting link 120 during the entry of the binder clamp, between the initial contact point 121 and the final contact point 122, thereby inducing the opening of the binder clamp 100 by an induced inward movement of the rear clamping jaws of the binder clamp.

[0062] This release simultaneously establishes a preload force induced by the torsion spring, which then acts on the introduced book block as a pressing force during the closing process. Upon introduction of this preload force on the torsion spring, the detent is lifted, pulled back or disengaged from its fixed locking position via the complementary connecting link, whereby the established force of the preloaded torsion spring is first transmitted in a frictional engagement manner to the binder clamp, thereby initiating closure of the clamping jaws of the binder clamp, which produces a clamping action on the clamped book block, thereby achieving the position indicated by position item 160.

[0063] During further travel through the inlet section 150, the cam roller 130 associated with the binder clamp first link 120, allowing the clamping jaws of the binder clamp to move in a controlled manner toward the book block, so that the book block is free of degrading pressure-related markings. During this process, the detent remains in an inoperative state, allowing the biasing force of the torsion spring to be fully realized. After the book block processing is complete, at least for reasons of spine processing of the book block, i.e., application of adhesive, and cover attachment, the detent again engages the binder clamp mechanism, which acts directly on the torsion spring.

[0064] After completion of the book block through the finishing station, the corresponding binder clamps move towards the outlet connecting link 110 and in this discharge position of the completed book block the dynamics acting on the binder clamps are the same as in the loading position of the book block relative to the inlet connecting link 120, as already explained above.

[0065] At this ejection point, it is only necessary to ensure that the clamping jaws of the binder clamps open to a sufficiently large extent so that the completed book blocks do not interfere with the binder clamps.

[0066] As can be easily seen from FIG. 2, when each binder clamp is opened and closed, link applies a force to each binder clamp in the opposite direction of the transport path. In this case, when this force is realized between the cam roller 130 and the discharge connecting link 110 or the load connecting link 120, consideration must be given to impacts that cause interference with the speed of the clamp chains, which negatively affects the positioning of the cover. This connecting link / binder clamp collision can often impair the accuracy of the spine of the book block by applying glue and other adhesive bonding processes.

[0067] Current inlet and outlet cams cannot be set according to the time per cycle. This is primarily because current inlet and outlet cams are relatively long, allowing them to detect multiple binder clamps simultaneously. Therefore, the setup time for changing book block thicknesses can be lengthy for some thickness settings, especially when binder clamp opening is performed in multiple stages, i.e., multiple rotations of the clamp chain are required. Existing load and discharge cams 110 / 120 are set correspondingly long to prevent a crash when an accidentally open clamp approaches one of the cams.

[0068] A crash can occur if the binder clamps are closed by incorrect manual operation or if the binder clamps are accidentally not loaded with a book block. Therefore, the loading and ejection cams are also made relatively long to prevent the binder clamps from closing too quickly when they detect a book block or from hitting the book block due to incorrect activation of the detents. The current system implementation type means that during each cycle the clamp chain can be subjected to interference-type collisions due to impacts between the cam rollers and the cam path opposite to the direction of movement.

[0069] 3 shows diagrammatically the perfect binder clamp opening system according to the invention, consisting of a first drive unit 301 at a loading position 300 (also called loading station) in the entrance area 150, another drive unit 401 at a discharge position 400 (also called discharge station) in the exit area 140, and another drive unit 501 at an intermediate station 500, the last-mentioned drive unit generally fulfilling the function of controlling the opening of the binder clamps 100 in front of unit 301 when required. This makes it possible to pre-assist the binder clamps 100 for the required opening at loading station 300, so that each clamp can then be set to the subsequent thickness of the book block to be accommodated, which can be achieved at full production speed.

[0070] This allows book blocks introduced into the perfect binder one after the other to have continuously different thicknesses, so that the opening system of the binder clamps is no longer controlled via a fixed connecting link with a fixed opening, but by individually controlled drive units 301, 401, 501 by local drives, which can provide the desired opening of the binder clamps within a full production run.

[0071] The main advantage of these precautions is that the opening of the binder clamps can be continuously adapted to the book blocks to be produced, which can generally be achieved without the intervention of idle cycles, and even in the case of very large differences in book block thickness, the intervention of at most two idle cycles is necessary.The binder clamp opening system according to the invention therefore allows each binder clamp to be optimally set to a predetermined book block thickness in BVD mode, which completely eliminates the setup times between different book block thicknesses.

[0072] If the processing of different lots is planned in advance, the different orders can be carried out without interruption for preventive measures of the equipment, so that the thickness of the book blocks to be processed can be gradually increased or decreased without stopping the machine.

[0073] The setting of each binder clamp 100 is directional and extends purely perpendicular to the transport path of the binder ramp, so that no direct and secondary forces are generated on the clamp chain 20, so that positioning accuracy is not violated, particularly, but not only, when attaching book blocks.

[0074] To achieve these goals, it is planned to replace both rigidly positioned connecting links (see items 110, 120 in Fig. 2) and instead provide each binder clamp 100 with an integrated, geometrically compact flap (i.e. without chamfers), which is operated by externally arranged force-applying drives, in particular at the entry and exit positions of the respective stations 300, 400, 500, as components of the associated units 301, 401, 501 (see also Fig. 7). In this case, the pressing force is controlled by a movable lever, which converts the force to press the flap into the interior of the binder clamp, thus constituting the preload of the torsion spring or other element.

[0075] The same force-applying drive unit 401 for transmitting a pressing force to the movable flap in the binder clamp 100 is arranged in the exit area 140, i.e. below the processing station associated with the perfect binder, where the discharge of the completely processed book block (discharge operation) is introduced: here too, the force-applying drive is used as before, but this time it again presses the flap and opens the clamping jaws of the binder clamp by a further amount only from the predetermined clamping state so that the book block can be completely released from the binder clamp. The empty binder clamp then moves further along the pivot path of the clamping chain 20 to the intermediate station 500 and / or the loading station 300, where a new kinematic system is put into operation to accommodate the subsequent book block for processing.

[0076] The underlying drive here, in addition to its normal use at the (main) stations 300 (loading), 400 (discharge), can also be provided at any other position along the rotation path of the clamp chain 20 of the perfect binder 10, for example for the early discharge of intermediate, quality-unsuitable book blocks from the processing process, preferably for the pre-opening of the clamp jaws of the binder clamps before the actual loading 300 of the book block, for example by means of the drive unit 501.

[0077] Therefore, in addition to the loading and unloading stations 300, 400, at least one third station 500 is also provided according to the invention. This station is referred to herein as "Make Ready." This station allows for a change in the opening of the binder clamps between the unloading station 400 (unloading position) and the loading station 300 (storing position). During continuous operation, the change in the opening of the binder clamps can be relatively large. Thus, for example, the binder clamp opening should be able to accommodate a change from 90 mm at the unloading station 400 to 20 mm at the loading station 300.

[0078] The "Makeready" station 500 should be located as close as possible to the loading station 300: in this way the perfect binder can be set in terms of control technology so that such changes in the opening of the binder clamps must be realized as late as possible.

[0079] With this third station 500, the opening of the binder clamps is completely independent of the preceding or following binder clamps. Assuming the perfect binder is set to maximum opening throughout the entire area, production rates of up to 7000 cycles per hour can be easily maintained. Additionally, this third station can provide the required intermediate opening without a setup time interval.

[0080] The configuration of each binder clamp in the process can be determined by a non-contact sensor, so that the opening of each arriving binder clamp is predetermined before it reaches the respective station, with the ultimate aim that the control will automatically intervene when necessary to introduce remedial-preventive measures on all fronts.

[0081] This intervention can also be useful if a malfunction occurs after the perfect binder has been started, for example if the predetermined dynamics of the binder clamps are erroneously interfered with. After determining the malfunction, the control can slow down the travel speed of the perfect binder until normal operation is normalized again.

[0082] To maximize the safety of the overall system, sensors should be provided that provide information regarding the exact current release of binder clamps arriving at each station 300, 400, 500.

[0083] Basically, the subject matter according to the invention offers great flexibility, especially when it comes to ensuring the perfect continuous accommodation of book blocks of different thicknesses, whereby it differs significantly from the prior art in that the radical thickness variation (BVD) from one binder clamp to the next can no longer vary quantitatively within the narrow limits of ±3.25 mm as in the prior art.

[0084] In fact, advanced perfect binders are capable of gripping book block thicknesses that increase or decrease progressively from 13 mm to at least 20 mm from one binder clamp to the next. It is clear that at such intervals, the accommodation of large thickness differences from one binder clamp to the next must be accomplished as quickly as possible. In accordance with the present invention, it is further proposed to now completely eliminate the impact of the cam rollers (item 130 in FIG. 2) on the connecting links (items 110 and 120 in FIG. 2), which routinely caused vibrations of the clamp chain 20.

[0085] 4 shows a modified part of the binder clamp 100, which is now shown in the closed state. The modified part of the binder clamp according to the invention consists of a movable flap 350, which replaces the kinematics for opening the binder clamp that exist in the prior art (see FIG. 2). This flap 350 is pressed into the binder clamp 100 by a force 351 generated from the outside by the drive units 301, 401, 501, which causes the outer arranged part 151 of the binder clamp 100, which is operatively connected to the rack 152, to be correspondingly pressed, resulting in the desired opening for receiving the book block. During this process, the torsion spring 160 integrated in the binder clamp 100 is simultaneously subjected to a preload that can be used for gripping the book block in a frictional engagement manner.

[0086] It should be noted that in this case the closing of the binder clamps should preferably be performed in a speed-controlled manner so that the book block is not damaged by excessive impacts caused by crushing or cutting. This also applies when closing binder clamps that are not loaded: here too the closing speed needs to be controlled so that unnecessary impacts, which invariably cause noise and damage, do not occur.

[0087] For example, above this torsion spring 160 (see FIG. 5) extends the clamp chain 20 already described many times for carrying out the transport of the binder clamps. Also evident in this figure are the various rollers and levers which adjust the transport guide of each binder clamp along the individual processing stations of the perfect binder binder 10. Also evident in FIG. 4 are the rollers on a holding system 170, the design and mode of operation of which will be explained in more detail in FIG. 6.

[0088] FIG. 5 illustrates the cooperation of the previously mentioned retention system 170 and torsion spring 160. As already explained, during the opening process (item 151, see also FIG. 4), the binder clamp is subjected to a potentially usable inward preload force due to the force introduced by the flap 350 on said torsion spring 160, which in turn serves as a pressing force against the book block (see FIG. 4). The retention system 170 is generally activated and deactivated at various fixed times during operation of the perfect binder, thereby enabling the binder clamp to be transported at least partially open during part of its rotation. For this purpose, the retention system absorbs the force of the torsion spring 160 when necessary, thus providing the binder clamp with a predetermined opening. Since the mechanism of the retention system 170 itself is under spring force, the detents 171 belonging to the ratchet mechanism can lock in place against the opening of the outer part 151 of the binder clamp (100).

[0089] This means that the binder clamp can no longer close under the action of the initially preloaded torsion spring force, as long as the detent 171 remains frictionally locked in the ratchet 172. The lateral geometric continuation of the ratchet 172 is formed by the pinion 176, which is operatively connected to the rack 152. To eliminate or partially change the opening of the binder clamp, the detent 171 must be released, which is achieved by a controlled mechanical function pressing the upper roller 173 of the retention system 170, so that a translational movement is transmitted to the rod 174 of the detent system, which ultimately causes the release.

[0090] FIG. 6 shows the same retention system 170 as in FIG. 5, but from another perspective. The torsion spring (see item 160 in FIG. 5) is no longer visible in this perspective view because it extends coaxially behind the ratchet 172, which is formed as a roll. The continuation of the torsion spring on the rack 152 side, best seen in FIG. 5, is equipped with a bolt-like pinion 176. This pinion is operatively connected to the rack 152 on the one hand, and also to the torsion spring via the ratchet 172, so that the opening of the post-binder clamping section 151 (see FIGS. 4 and 5) simultaneously preloads the torsion spring. During this process, the detent 171 wanders aimlessly over the teeth of the ratchet 172 due to the laterally acting bearing 177, i.e., the spring force acting specifically on the detent is not effective during this process.

[0091] As already explained, the binder clamp is always preloaded by said torsion spring 160 during the opening process (item 151, see also FIG. 4), which is caused by said movement of the flap 350 into the interior of the binder clamp.

[0092] As already explained above under Fig. 5, the retention system 170 is generally activated and deactivated at various fixed times during operation of the perfect binder, thereby making it possible to keep the binder clamp at least partially open during part of its rotation. For this purpose, the retention system absorbs the force of the torsion spring 160 by locking the detents 171 into the ratchet when necessary, resulting in the binder clamp having a predetermined opening. The mechanism of the retention system 170 itself is spring-loaded so that the associated detents 171 can be locked in a frictionally engaged position against the opening of the outer portion 151 of the binder clamp (100).

[0093] This means that the binder clamp can no longer initially close under the torsion spring force, i.e. is blocked, until the detent 171 remains frictionally locked in the ratchet 172. The series of ratchet 172 is constituted by a bolt-like pinion 176 which is coupled to the rack 152. To eliminate or partially change the opening of the binder clamp, the detent 171 must be released, which is achieved by a controlled mechanical function pressing the upper roller 173 of the retention system 170 so that a translational movement is transmitted to the rod 174 of the retention system which ultimately causes the release.

[0094] 7 shows the detailed structure of the binder clamp 100 around the drive unit 301 for the loading station 300, which introduces the operative insertion of the flap 350 into the binder clamp. The drive units 401, 501 shown in FIG. 3 have the same structure as the drive unit 301 and realize the same kinematics for each flap of each binder clamp for the other stations 400, 500.

[0095] The closing of the binder clamps at the loading station 300 (see FIG. 3) and the opening of the binder clamps at the discharge station 400 (see FIG. 3) of the system according to the invention function in a similar manner to the solution previously evaluated for the prior art (see FIG. 2). However, in both cases the similarity is only to be seen in the fact that a predetermined opening of the binder clamps' fastening at the loading and discharge stations 300, 400 is set. However, the actual manner in which the opening and closing of the binder clamps according to the invention is carried out is fundamentally different. This difference allows different book block thicknesses to be processed successively.

[0096] Accordingly, instead of a cam roller (see item 130 in FIG. 2) associated with the binder clamp, which rolls along the cam path of a fixed connecting link (see items 110 and 120 in FIG. 2), a roller 356 associated with a movable lever 355 at said station presses against the front edge 352 of the movable flap 350, thereby achieving a partial opening 600 of the binder clamp 100 by pressing in at least the outermost portion 151 via the advancement of the rack 152.

[0097] 7 also shows another important component of the system, the clamping chain 20 (see FIG. 3) and the retention system 170 (see FIG. 6) of the perfect binder 10.

[0098] The drive of the movable lever 355 is provided by a drive unit 301, 401, 501, respectively, which is fixedly arranged at the respective station 300, 400, 500 and comprises at least a motor 353 and a transmission 354, so that each roller 356 attached to the lever 355 can provide, without delay, the definite movement of the binder clamp required by the control unit. The present application relates to the invention described in the claims, but also includes the following as other aspects. 1. A machine for producing perfect-bound printed products, i.e. book blocks, comprising essentially a rotating clamp chain, the clamp chain comprising spaced apart binder clamps, each binder clamp being operatively connected to a clamp opening system, the clamp opening system comprising at least one clamp internal means and at least one clamp external means, both of which are operatively connected to one another and which effect opening of clamp jaws associated with the binder clamps, 1. A machine according to claim 1, wherein, at the loading position (300) of the book block (200), clamp external means (355, 356) operable by a drive unit (301) are capable of applying a drive-related pressing action (351) to a movable clamp internal means (350), which clamp internal means realizes a predetermined opening (600) of clamp jaws (151) associated with the binder clamp (101) depending on the thickness of the book block to be accommodated, and wherein the drive-related pressing action generates a reaction force (160) which can be realized as a pressing force on the accommodated book block within the current cycle. 2. A machine for producing perfect-bound printed products, i.e. book blocks, comprising essentially a rotating clamp chain, the clamp chain comprising spaced apart binder clamps, each binder clamp cooperating with a clamp opening system, the clamp opening system comprising at least one clamp internal means and at least one clamp external means, both of which are operatively connected to one another and which effect the opening of clamp jaws (151) associated with the binder clamps, 1. A machine characterized in that, at the ejection position (400) of the book block (200), a pressing action (351) associated with the drive can be applied to the movable clamp internal means (350) by means of clamp external means (355, 356) operable by a separate unit (401), which pressing action can cause an additional opening (600) of the clamp jaws associated with the binder clamp (101), which opening is adjusted for the release of the guided book block. 3. A machine for producing perfect-bound printed products, i.e. book blocks, comprising essentially a rotating clamp chain, the clamp chain comprising spaced apart binder clamps, each binder clamp cooperating with a clamp opening system, the clamp opening system comprising at least one clamp inner means and at least one clamp outer means, both means operatively connected to one another and providing for the opening of clamp jaws associated with the binder clamps, At least one further clamp opening system is arranged along the rotation of the clamp chain (20) in an operating position (500) that is different from the loading position (300) and the unloading position (400) of the book block (200), the further clamp opening system comprising a drive unit (501) and clamp external means (355, 356) operable by the drive unit, the clamp external means being able to impart a drive-related pressing operation (351) to the movable clamp internal means (350), the pressing operation realizing an opening (600) adapted to the operating state of clamp jaws (151) associated with the binder clamp (101). 4. 4. The machine of any one of 1 to 3 above, characterized in that the loading position (300), the unloading position (400) and the opening (600) at the other operating position (500) have the same or different opening rates. 5. 4. The machine of any one of 1 to 3 above, wherein the drive unit (301, 401, 501) consists essentially of a motor (353), preferably a servo motor, and a transmission (354). 6. 4. The machine according to any one of claims 1 to 3, wherein the movable internal means (350) of the binder clamp (101) consists of a flap. 7. Any one of the machines 1 to 3 above, characterized in that the clamp external means comprises at least one lever (355) and at least one roller (356) arranged on the terminal side of the lever. 8. The machine according to claim 1, characterized in that the loading position (300) is arranged upstream of a processing station that operates in the direction of rotation of the clamping chain (20) of the machine (10) configured as a perfect binder. 9. 2. The machine according to claim 1, wherein the discharge position (400) is arranged downstream of a processing station that operates in the direction of rotation of the clamping chain (20) of the machine (10) configured as a perfect binder. 10. 4. The machine according to any one of claims 1 to 3, characterized in that each predetermined opening (600) of the clamp jaws associated with the binder clamp (101) can be temporarily or permanently fixed by a holding system (170). 11. 10. Machine according to claim 10, characterized in that the mechanism of the retention system (170) consists essentially of a ratchet (172) and a movable detent (171) operatively connected to said ratchet, said detent realising the locking of the clamp jaws in a predetermined position. 12. 4. The machine according to any one of 1 to 3 above, wherein the drive unit (301, 401, 501) induces a pivoting movement of the clamp outer means (355, 356), and by this pivoting movement, the pressing operation (351) can be transmitted to the front surface (352) of the movable clamp inner means (350). 13. 4. The machine of any one of claims 1 to 3, characterized in that at least in the loading position (300) or the unloading position (400) of the book block (200) or in any other operating position (500) along the rotating clamping chain (20), the opening (600) of the clamping jaws (151) associated with the binder clamps can be provided by other means, and the opening measures of these means can simultaneously constitute a reaction force (160). 14. 14. The machine according to claim 13, characterized in that the reaction force can be realized by the preload force of a spring (160) or by the transformation of mechanical, pneumatic or hydraulic forces. 15. 15. The machine according to claim 14, wherein the spring (160) is a torsion spring. 16. A method for operating a machine for producing perfect-bound printed products, i.e. book blocks, said machine consisting essentially of a rotating clamp chain, said clamp chain having spaced apart binder clamps, each binder clamp cooperating with a clamp opening system, said clamp opening system consisting of at least one clamp inner means and at least one clamp outer means, both means operatively connected to each other and by which opening of clamp jaws associated with the binder clamps is achieved, a clamp external means (355, 356) operable by a drive unit (301) at the loading position (300) of the book block (200) applies a drive-related pressing action (351) to a movable clamp internal means (350) by means of which a predetermined opening (600) of clamp jaws (151) associated with the binder clamp (101) is realized depending on the thickness of the book block to be accommodated, and a reaction force (160) is generated by the drive-related pressing action, which reaction force is realized as a pressing force on the accommodated book block within the current cycle. 17. A method for operating a machine for producing perfect-bound printed products, i.e. book blocks, said machine consisting essentially of a rotating clamp chain, said clamp chain having spaced apart binder clamps, each binder clamp cooperating with a clamp opening system, said clamp opening system consisting of at least one clamp inner means and at least one clamp outer means, both means operatively connected to each other and by which opening of clamp jaws associated with the binder clamps is achieved, a clamp external means (355, 356) operable by a separate drive unit (401) applies a drive-related pressing action (351) to the movable clamp internal means (350) at the ejection position (400) of the book block (200), which pressing action generates an additional opening (600) of the clamp jaws (151) associated with the binder clamp (101), which opening is adjusted for the release of the guided book block. 18. A method for operating a machine for producing perfect-bound printed products, i.e. book blocks, said machine consisting essentially of a rotating clamp chain, said clamp chain having spaced apart binder clamps, each binder clamp cooperating with a clamp opening system, said clamp opening system consisting of at least one clamp inner means and at least one clamp outer means, both means operatively connected to each other and by which opening of clamp jaws associated with the binder clamps is achieved, a clamp chain (20) for rotating the book block (200) to a different operating position (500) relative to the loading position (300) and the unloading position (400), and the clamp chain (20) for rotating the book block (200) to a different operating position (500), ...0) for rotating the book block (200) to a different operating position (500), the clamp chain (200) for rotating the book block (200) to a different operating position (500), the clamp chain (200) for rotating the book block (200) to a different operating position (500), the clamp chain (200) for rotating the book block (200) to a different operating position (500) relative to the loading position (300) and the unloading position (400), the clamp chain (200) for rotating the book block (200) to a different operating position (500), the clamp chain (200) for rotating the book block (200) to a different operating position (500), the clamp chain (200) for rotating the book block (200) to a different operating position (500), the clamp 19. 19. The method according to any one of claims 16 to 18, characterized in that the reaction force constituted by the pressing operation is realized immediately as soon as the internal means (350) passes through the operating position (300, 400, 500) of the respective drive unit (301, 401, 501). 20. 19. The method according to claim 18, characterized in that the drive unit (501) in the first alternative operating position (500) achieves at least a preliminary partial opening of the clamp jaws associated with the binder clamp (101) relative to the downstream acting loading position (300). 21. 19. The method according to claim 18, characterized in that the opening of the clamp jaws associated with the binder clamps (101) for ejection of the book block is achieved by a separate drive unit (501) optionally arranged along the clamp chain (20). 22. 17. The method according to claim 16, characterized in that the loading position (300) of the book block (200) operates upstream of the processing station of the machine acting in the direction of rotation of the clamping chain (20). 23. 18. The method according to claim 17, characterized in that the ejection position (400) of the book block (200) operates downstream of the processing station of the machine acting in the direction of rotation of the clamping chain (20). 24. 19. The method according to any one of claims 16 to 18, wherein each of the clamp jaws attached to the binder clamp is temporarily or continuously held open or partially open by a holding mechanism (170). 25. 19. The method according to any one of claims 16 to 18, characterized in that the clamp outer means (355, 356) driven by a drive unit performs a pivoting movement in which a pressing operation (351) is transmitted to the clamp inner means (350).

Claims

1. A machine for producing perfect-bound printed products, i.e. book blocks, comprising a rotating clamp chain, the clamp chain comprising spaced apart binder clamps, each binder clamp being operatively connected to a clamp opening system, the clamp opening system comprising at least one clamp internal means and at least one clamp external means, both operatively connected to each other and providing for the opening of clamp jaws associated with the binder clamps, 1. A machine according to claim 1, wherein, in the loading position (300) of the book block (200), clamp external means (355, 356) operable by a drive unit (301) are capable of continuously applying to the movable clamp internal means (350) pressure actions (351) associated with the drive, which correspond to the opening of clamp jaws associated with the binder clamp, and which clamp internal means achieve a predetermined opening (600) of the clamp jaws (151) associated with the binder clamp (101) depending on the thickness of the book block to be accommodated, and wherein the pressure actions associated with the drive are capable of forming a reaction force (160), which can be realized as a pressing force on the accommodated book block within the current cycle.

2. A machine for producing perfect-bound printed products, i.e. book blocks, comprising a rotating clamp chain with spaced apart binder clamps, each binder clamp cooperating with a clamp opening system, the clamp opening system comprising at least one clamp internal means and at least one clamp external means, operatively connected to each other and realising the opening of clamp jaws (151) associated with the binder clamps, 1. A machine characterized in that, in the ejection position (400) of the book block (200), clamp external means (355, 356) operable by a separate unit (401) can continuously apply a pressing action (351) associated with the drive to the movable clamp internal means (350) corresponding to the opening of clamp jaws associated with the binder clamp, by means of which pressing action an additional opening (600) of the clamp jaws associated with the binder clamp (101) can occur, this opening being adjusted for the release of the guided book block.

3. A machine for producing perfect-bound printed products, i.e. book blocks, comprising a rotating clamp chain, the clamp chain comprising spaced apart binder clamps, each binder clamp cooperating with a clamp opening system, the clamp opening system comprising at least one clamp internal means and at least one clamp external means, operatively connected to each other and realising the opening of clamp jaws associated with the binder clamp, a clamp chain (20) for connecting the binder clamps (101) to the binder clamps (101) in a first operating position (500) and a second operating position (500) for connecting the binder clamps (101) to the binder clamps (101), the clamp chain (20) being connected to the first operating position (500) and the ...

4. Machine according to any one of claims 1 to 3, characterized in that the opening (600) in the loading position (300), the unloading position (400) and the further operating position (500) have the same or different opening rates.

5. Machine according to any one of claims 1 to 3, characterized in that the drive unit (301, 401, 501) consists of a motor (353) or a servomotor and a transmission (354).

6. Machine according to any one of claims 1 to 3, characterized in that the movable internal means (350) of the binder clamp (101) consist of a flap.

7. 4. A machine according to claim 1, wherein the clamping external means comprises at least one lever (355) and at least one roller (356) arranged on the terminal side of said lever.

8. 2. The machine according to claim 1, wherein the loading position (300) is arranged upstream of a processing station operating in the direction of rotation of the clamping chain (20) of the machine (10) configured as a perfect binder.

9. 3. The machine according to claim 2, characterized in that the discharge position (400) is arranged downstream of a processing station operating in the direction of rotation of the clamping chain (20) of the machine (10) configured as a perfect binder.

10. 4. Machine according to any one of claims 1 to 3, characterized in that each predetermined opening (600) of the clamping jaws associated with the binder clamps (101) can be temporarily or permanently fixed by a holding system (170).

11. 11. A machine according to claim 10, characterized in that the mechanism of the holding system (170) consists of a ratchet (172) and a movable detent (171) operatively connected to said ratchet, said detent realising the locking of the clamping jaws in a predetermined position.

12. 4. The machine according to claim 1, wherein the drive unit (301, 401, 501) induces a pivoting movement of the clamp outer means (355, 356), by means of which a pressing action (351) can be transmitted to a front face (352) of the movable clamp inner means (350).

13. 4. The machine according to claim 1, wherein a reaction force (160) can be configured simultaneously with the opening (600) of clamping jaws (151) associated with the binder clamps at least in the loading position (300) or in the ejection position (400) of the book block (200) or in any other operating position (500) along the rotating clamping chain (20).

14. 14. Machine according to claim 13, characterized in that the reaction force can be realised by the preload force of a spring (160) or by mechanical, pneumatic or hydraulic force transformation.

15. 15. Machine according to claim 14, characterized in that the spring (160) is a torsion spring.

16. A method for operating a machine for producing perfect-bound printed products, i.e. book blocks, said machine comprising a rotating clamp chain with spaced apart binder clamps, each binder clamp cooperating with a clamp opening system, said clamp opening system comprising at least one clamp internal means and at least one clamp external means operatively connected to each other and enabling opening of clamp jaws associated with the binder clamps, 1. A method for loading a book block (200) comprising the steps of: (a) applying a driving-related pressing action (351) to a movable clamp internal means (350) at the loading position (300) of the book block (200) by means of clamp external means (355, 356) operable by a drive unit (301) successively, corresponding to the opening of clamp jaws associated with the binder clamp, the clamp internal means realizing a predetermined opening (600) of the clamp jaws (151) associated with the binder clamp (101) depending on the thickness of the book block to be loaded; and (b) forming a reaction force (160) by the driving-related pressing action, which is realized as a pressing force on the loaded book block in the current cycle.

17. A method for operating a machine for producing perfect-bound printed products, i.e. book blocks, said machine comprising a rotating clamp chain with spaced apart binder clamps, each binder clamp cooperating with a clamp opening system, said clamp opening system comprising at least one clamp internal means and at least one clamp external means operatively connected to each other and enabling opening of clamp jaws associated with the binder clamps, a clamp external means (355, 356) operable by a separate drive unit (401) successively applies a driving-related pressing action (351) to the movable clamp internal means (350) at the ejection position (400) of the book block (200), which pressing action corresponds to the opening of the clamp jaws associated with the binder clamp, and by which an additional opening (600) of the clamp jaws (151) associated with the binder clamp (101) is generated, which opening is adjusted for the release of the guided book block.

18. A method for operating a machine for producing perfect-bound printed products, i.e. book blocks, said machine comprising a rotating clamp chain with spaced apart binder clamps, each binder clamp cooperating with a clamp opening system, said clamp opening system comprising at least one clamp internal means and at least one clamp external means operatively connected to each other and enabling opening of clamp jaws associated with the binder clamps, a clamp chain (20) for rotating the book block (200) to a different operating position (500) relative to the loading position (300) and the unloading position (400), and the clamp chain (20) for rotating the book block (200) to a different operating position (500), the clamp chain (20) for rotating the book block (200) to a different operating position (500), the clamp chain (20) for rotating the book block (200) to a different operating position (500), the clamp chain (20) for rotating the book block (200) to a different operating position (500), the clamp chain (20) for rotating the book block (200) to a different operating position (500), the clamp chain (20) for rotating the book block (200) to a different operating position (500), the clamp chain (200) for rotating the book block (200) to a different operating position (500), the clamp chain (200) for rotating the book block (200) to a different operating position (500), the clamp chain (200) for rotating the book block (200) to a different operating position (500) relative to the loading position (300) and the unloading position (400), the clamp chain (200) for rotating the book block (200) to a different operating position (5 ...

19. 19. The method according to any one of claims 16 to 18, characterized in that the reaction force constituted by the pressing operation is realized as soon as the internal means (350) passes through the operating position (300, 400, 500) of the respective drive unit (301, 401, 501).

20. 19. The method according to claim 18, characterized in that the drive unit (501) in the first further operating position (500) realizes at least a partial opening of the clamping jaws associated with the binder clamp (101) in advance relative to the loading position (300) acting downstream.

21. 19. The method according to claim 18, characterized in that by means of a further drive unit (501) optionally arranged along the clamping chain (20), the opening of clamping jaws associated with the binder clamps (101) is realised for ejection of the book block.

22. 17. A method according to claim 16, characterized in that the loading position (300) of the book block (200) operates upstream of a processing station of the machine acting on the direction of rotation of the clamping chain (20).

23. 18. Method according to claim 17, characterized in that the ejection position (400) of the book block (200) operates downstream of a processing station of the machine acting in the direction of rotation of the clamping chain (20).

24. 19. The method according to any one of claims 16 to 18, characterized in that the clamp jaws associated with the binder clamp are each held open or partially open, either temporarily or continuously, by a holding mechanism (170).

25. 19. The method according to any one of claims 16 to 18, characterized in that the clamp outer means (355, 356), driven by a drive unit, perform a pivoting movement in which a pressing action (351) is transmitted to the clamp inner means (350).

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