Patent Abstract:
A folding device includes a folding blade cylinder and a cooperating folding jaw cylinder, each of which has several circumferentially arranged holding devices. These holding devices can be moved between a disengaged position, where the leading end of a product can be inserted or released, and a holding position in which the product leading edge is held in the holding device. The folding blade cylinder and the folding jaw cylinder each have a number of holding devices equal to the respective number of folding blades and folding jaws. Each of the folding blades presses a product to be folded, and which is held by one of the holding devices on the folding blade cylinder, into a cooperating folding jaw on the folding jaw cylinder. This is accomplished during the passage of the product through a transfer slot between the folding blade cylinder and the folding jaw cylinder. An offset between each folding blade and its associated holding device is adjustable. The location of a holding device, and a subsequent folding blade is fixed. The offset between one of the holding devices of the folding blade cylinder and one of the folding blades that follows that holding device is less than a maximum offset between one of the holding devices and the folding blade that follows behind the folding device.

Full Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the U.S. national phase, under 35 U.S.C. 371, of PCT/EP 2007/058597, filed Aug. 20, 2007; published as WO 2008/031690 A1 on Mar. 20, 2008 and claiming priority to DE 10 2006 042 592.8, filed Sep. 11, 2006, the disclosures of which are expressly incorporated herein by reference. 
     FIELD OF THE INVENTION 
     The present invention is directed to folding apparatuses with a folding blade cylinder and a folding jaw cylinder. Each of the folding blade cylinder and the folding jaw cylinder is provided with holding devices. The folding blade cylinder is provided with a folding blade for each of its holding devices. A distance between each folding blade and its allocated holding device can be varied. 
     BACKGROUND OF THE INVENTION 
     A folding apparatus of this general type is known from DE 44 12 142 C2. This prior art device comprises a collecting cylinder, a folding jaw cylinder and a cutting unit which is located upstream of the collecting cylinder. The cutting unit is used to divide the web of material into the individual products. The collecting cylinder has a plurality of grippers to which the leading edge of a product is fed. The grippers press this leading edge of each such cut, individual product against the collecting cylinder, which will convey it further. To allow the grippers to pivot between a released position and a holding position, without damaging the products, the products must be offset from each other around the periphery of the collecting cylinder by an intermediate space in which the grippers are able to move. To provide this intermediate space, the peripheral speed of the collecting cylinder must be greater than the speed at which the web of material is fed into the folding apparatus. 
     The collecting cylinder described in DE 44 12 142 C2 is also equipped with a plurality of folding blades, which, when the folding apparatus is in fold production mode, extend each time they pass through a gap that is formed between collecting cylinder and folding jaw cylinder. Each of these folding blades press products that lie in front of them into a folding jaw of the folding jaw cylinder. The first cross fold, which is produced in this manner, is intended to divide the products at the center. It is thus necessary, when processing products of different lengths, to be able to vary the distance between grippers and folding blades on the collecting cylinder. To accomplish this result, grippers and folding blades are mounted on two different nested parts of the collecting cylinder, which two parts can be rotated counter to one another. 
     In fold production mode, the folding blades of the collecting cylinder must always meet with the folding jaws of the folding jaw cylinder at a transfer gap that is formed between the collecting cylinder and the folding jaw cylinder, in order to insert a product into the folding jaws of the folding jaw cylinder. The part of the collecting cylinder that holds the folding blades is therefore rigidly rotatably coupled to the folding jaw cylinder. 
     In book production mode, each of the grippers of the collecting cylinder passes through the transfer gap at the same time as does a gripper of the folding jaw cylinder. During such passage through the transfer gap, the gripper of the collecting cylinder pivots from a product end holding position to a product end released position. At the same time, the gripper of the folding jaw cylinder pivots from the released position to the holding position. A product is thus transferred from the collecting cylinder to the folding jaw cylinder without being cross folded, especially if the folding blades are also deactivated. 
     A circumferential distance between grippers and folding blades on the collecting cylinder is adjustable. The folding blades and the folding jaws must always pass through the transfer gap simultaneously, regardless of variations of this circumferential distance between grippers and folding blades on the collecting cylinder. As a result, the grippers of the collecting cylinder and those of the folding jaw cylinder are able to pass through the gap at different times. If a gripper of the folding jaw cylinder strikes a product, while that gripper is passing through the gap, the product will be damaged as a result of a pivoting movement of this gripper. To prevent this product damage, the gripper of the folding jaw cylinder must always strike an intermediate space on the collecting cylinder, between the products which are held on the collecting cylinder. For this reason, an angular distance between the grippers and the folding jaws of the folding jaw cylinder is chosen such that, when the distance between a gripper of the collecting cylinder and a gripper on the folding blade, that is interacting with a product being held by this gripper of the collecting cylinder is set to the greatest possible value, the grippers of the collecting cylinder and those of the folding jaw cylinder will pass through the gap between the two cylinders simultaneously. If the angular distance is adjusted to be smaller, the gripper of the folding jaw cylinder passes through the gap shortly before the gripper of the collecting cylinder. The gripper of the folding jaw cylinder can thus be prevented from colliding with a product on the collecting cylinder, as long as the intermediate space between the products on the collecting cylinder is large enough. 
     The intermediate space which is required for this purpose must be wider than the width of a space that is necessary merely to extend the grippers of the collecting cylinder. Its width typically measures approximately 6 cm. Assuming that each of the products is 50 cm in length, it follows that, to generate the necessary intermediate space, the speed at which the web of material is fed to the cutting unit must be 12% slower than the peripheral speed of the cylinders. However, the latter speed is limited due to the centrifugal forces that occur during revolution of the cylinders. Thus, the wider the required intermediate space, the slower the web must be fed in, and the lower is the resulting productivity. The shorter the products are, the less favorable is the ratio of web infeed rate to peripheral speed of the cylinders. 
     DE 43 42 037 C1 and DE 36 28 411 A1 both disclose folding apparatuses having variable cut-off lengths. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide folding apparatuses having a folding blade cylinder and a folding jaw cylinder. 
     The object is attained, in accordance with the present invention by the provision of a folding blade cylinder and a folding jaw cylinder, each of which are equipped with a plurality of circumferentially spaced holding devices. The folding blade cylinder is also provided with a folding blade associated with each of its holding devices. Similarly, the folding jaw cylinder is also provided with a folding jaw associated with each one of its holding devices. A circumferential distance between each folding blade and its associated holder can be varied. A distance between a holding device on the folding jaw cylinder, and its following folding jaw is fixed. The distance between a folding jaw cylinder holding device, and its associated holder, is less than a maximum distance between one of the holding devices on the folding blade cylinder and the folding blade that follows behind this holding device. This distance may be less than 20°. 
     The benefits to be achieved with the present invention consist, in particular that, when the folding apparatus is in the first production mode, the holding devices of the folding jaw cylinder pass through the transfer gap between the collecting cylinder and folding jaw cylinder in the holding position. Therefore, the holding devices are prevented from damaging products when they are passing through the transfer gap, even if one of these holding devices passes through the transfer gap at the same time as does a product. 
     The intermediate space between successive products on the collecting cylinder need be no larger than is required for the proper functioning of the holding devices of the collecting cylinder. The intermediate space therefore need be no wider than 30 mm. Its width is preferably at least 20 mm. 
     A conveyor belt device, for use in accelerating the products to the peripheral speed of the collecting cylinder, is preferably arranged between the cutting unit and the collecting cylinder. 
     The above-mentioned production mode, referred to hereinafter as a first production mode, is preferably a fold production mode, in which the products are transferred from the folding blades to the folding jaws. In a second production mode, which is also called a book production mode, the products are transferred, unfolded, from the holding devices of the collecting cylinder to the holding devices of the folding jaw cylinder. 
     The movement of the holding devices of the folding jaw cylinder is preferably controlled, in a generally known manner, by the provision of a cam disk, which has a depression that corresponds to the released position. In the first production mode, the holding devices of the folding jaw cylinder are prevented from tracing the depression or depressions in the cam disk. 
     To prevent the holding devices from tracing the depression or depressions in the cam disk, a cover plate, for use in covering the depression, is preferably arranged coaxially with and is rotatable in relation to the cam disk. 
     The distance between a holding device of the folding jaw cylinder and a folding jaw that follows behind this holding device, on the circumference of the folding jaw cylinder, is preferably fixed. This is done in order to keep the structure of the folding jaw cylinder simple. Moreover, this distance is preferably smaller than is the maximum distance between one of the holding devices on the circumference of the collecting cylinder and the folding blade that follows behind this holding device. Thus, the folding jaws and holding devices can be distributed approximately evenly around the circumference of the folding jaw cylinder, so that the need to retract the folding jaws creates no particularly troublesome compatibility conditions with regard to the structure of the holding devices, and vice versa. 
     It is preferably also possible to deactivate the folding blade, by the use of a fold controller for the folding blade cylinder, which is preferably provided. Deactivation of the folding blade, by the use of the control device for the folding blade, would not be possible without eliminating one of the production modes that are now preferably possible. A deactivation of the folding jaw systems is preferably unnecessary. 
     If sheet end grippers are to be used as holding devices, they will rest against the outside of a product when they are holding the product against a cylinder. In such a situation, in order to minimize a projection of the grippers beyond a rolling circle radius of the cylinder that supports them, it is expedient for the sheet end grippers to press the products against contact surfaces, each of which contact surfaces is located in a depression in the cylinder circumference. This applies especially to grippers of the folding jaw cylinder. As these grippers pass through the transfer gap formed between collecting cylinder and the folding jaw cylinder, it is possible for these grippers to come into contact with a product which is being held on the collecting cylinder. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       One preferred embodiment of the present invention is represented in the set of drawings, and will be specified in greater detail in what follows. 
       The drawings show in 
         FIG. 1  a schematic side elevation view of a conventional folding apparatus; in 
         FIG. 2  a side elevation view of the folding apparatus, analogous to  FIG. 1 , and adjusted to process shorter products; in 
         FIG. 3  a second side elevation view of the folding apparatus of  FIG. 2  at a slightly later point in time; and in 
         FIG. 4  a side elevation view of the folding apparatus, adjusted to process longer products. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring initially to  FIG. 1 , there may be seen a schematic depiction of a generally conventional folding assembly. Because the folding apparatus of the present invention, and which is preferably arranged in a web-fed rotary printing press, has many components in common with the conventional folding apparatus of  FIG. 1 , the conventional folding apparatus of  FIG. 1  will first be described. The information provided in the discussion which follows, regarding the conventional folding apparatus of  FIG. 1 , will also apply to the folding apparatus in accordance with the present invention, unless otherwise stated or indicated in the context of that discussion. 
     An intake portion of the folding apparatus of  FIG. 1  is formed by a cutting unit  02 , which receives a printed web of material  01 , such as, for example, a web of paper  01 , from a superstructure, which superstructure is generally well known in the art and therefore is not represented in  FIG. 1 . The superstructure is typically configured having a plurality of guide rollers and turning bars, for example. The cutting unit  02  comprises a roller  03 , such as, for example, a blade roller  03 , which is equipped with a blade, and a roller  04 , such as, for example, an impression roller  04 , which is equipped with a hard rubber strip that forms an abutment for the blade. Blade roller  03  and impression roller  04  are rotationally driven at a peripheral speed that corresponds to the intake speed of the paper web  01 . A plurality of blades can also be distributed evenly on the blade roller  03 , and a cooperating number of abutments, which may preferably be provided as hard rubber strips, can be distributed evenly on the impression roller  04 . 
     Since the diameters of the rollers  03 ;  04  must be increased, in proportion with the number of blades and/or strips which they each are provided with, an embodiment comprising one blade and one abutment is preferred. 
     The lead of the paper web  01 , which is newly formed each time a product is cut off, enters into the junction  06  of a conveyor belt device  07 , where it is clamped, at increasing depth and with increasing strength, between opposing belts  08 ;  09  of the conveyor belt device  07 . The circulation speed of the belts  08 ;  09  is greater than the intake speed of the paper web  01 , and corresponds to a peripheral speed of a folding blade cylinder  11 , and particularly to the peripheral speed of a collecting cylinder  11 , to which the products, which are separated from the paper web  01  by the cutting unit  02 , are fed. The collecting cylinder  11  preferably has five holding devices  12 , such as, for example, five sheet or product leading end grippers  12 , and preferably also has five folding blades  18 , each following behind an associated one of the grippers  12  at an adjustable distance. Rather than five such holding devices  12 , three or seven of each may also be provided. At a point, which is identified in  FIG. 1  as  13 , the leading edges of the products are placed on the grippers  12  by the conveyor belt device  07 , when the grippers  12  are in a holding position. When a gripper  12  reaches an area  15 , by virtue of the continuing rotation of the collecting cylinder  11 , it pivots open and the leading end of a product slips underneath it. The gripper  12  then pivots back into the holding position, pressing the product against the circumferential surface of the collecting cylinder  11 . The product that is clamped in this manner is conveyed on the collecting cylinder  11  up to a transfer gap  14 . 
     The folding apparatus depicted in  FIG. 1  is usable in at least first and second production modes. In the first production mode, the folding blades  18  are operable and cross-fold the products, in cooperation with folding jaws  19  of a folding jaw cylinder  16 . In the second production mode, the folding blades  18  and the folding jaws  19  are deactivated. 
     When the folding apparatus is operating in the second production mode, which preferably is a book production mode, the folding blades  18  on the collecting cylinder  11  are deactivated, and each gripper  12  of the collecting cylinder  11  strikes a holding device  17 , such as, for example, a gripper  17  of a folding jaw cylinder  16 , at the transfer gap  14 , as is shown in  FIG. 1 . The collecting cylinder gripper  12  releases the product by pivoting outward, while the gripper  17  on the circumferential surface of the folding jaw cylinder  16  pivots inward into the holding position, thereby clamping the product securely against a contact surface. Such a contact surface is typically located at the base of a depression which is formed in the outer circumference of the folding jaw cylinder  16 . The relevant product is thus transferred, unfolded, to the folding jaw cylinder  16 . The distance between a gripper  17  of the folding jaw cylinder  16  and a corresponding folding jaw  19 , that follows behind this gripper  17  on the circumference of the folding jaw cylinder  16 , is smaller than 20°, and preferably is in the range of 15°±2.5°, viewed in the circumferential direction. 
     If, however, the folding apparatus is operating in the first production mode, which is referred to as the fold production mode, each gripper  12  on the collecting cylinder  11  first passes through the transfer gap  14  without opening. Only later, when the folding blades  18  and folding jaws  19 , which follow respectively behind the grippers  12 ;  17  on the circumference of the collecting cylinder  11  and the folding jaw cylinder  16 , meet one another, does the gripper  12  open. At that time, the folding blade  18  extends outward from the circumferential surface of the collecting cylinder  11 , thereby pressing a product, which will now become folded at the center, into the folding jaw  19 . The folding jaw  19  then closes to hold the product securely, and to convey the now-folded product further on the circumference of the folding jaw cylinder  16 . 
     The movements of the grippers  12 ;  17 , of the folding blades  18  and of the folding jaws  19  are all pivoting movements around axes  21 ;  22 . These pivot axes  21 ;  22  are stationary in relation to the collecting cylinder  11  and folding jaw cylinder  16 , respectively. The pivotal movements of the grippers  12 ;  17 , the folding blades  18  and the folding jaws  19  are actuated via rollers  23 , which rollers  23 , in turn, trace cam disks which are coaxial in relation to the collecting cylinder  11  or folding jaw cylinder  16 . The cam disks are stationary in relation to the collecting cylinder  11  and the folding jaw cylinder  16 , and are not specifically shown in  FIG. 1  as they are generally known in the art. 
     A cover plate, which is rotatable in relation to the axis of the collecting cylinder  11 , and which is also generally known in the art and therefore also not specifically shown in  FIG. 1 , is allocated to each of the cam disks, which control the movement of the grippers  12  or of the folding blades  18  of the collecting cylinder  11 . The circumference of that cover disk, like the circumference of the corresponding cam disk, is traced by the rollers  23  of the grippers  12  or of the folding blades  18 . The cover disks enable collect and non-collect operation of the folding apparatus. They rotate at selectable speed ratios with respect to the speed of rotation of the collecting cylinder  11 . In non-collect operation, the rotational speed of the cover disks can be adjusted to zero or to a first predetermined ratio to the rotational speed of the collecting cylinder  11 . In non-collect operation, in each production mode, with each revolution of the collecting cylinder  11 , the grippers  12  are allowed to open and close as they pass the location  15 . In the case of book production mode, the grippers  12  also open as they pass through the transfer gap  14 . In the case of fold production mode, the grippers  12  also open shortly after they pass through the transfer gap  14 . The folding blades  18  are allowed to extend each time they pass through the transfer gap  14  in non-collect, fold production mode. In the case of collect production, the cover disks rotate at a second preset speed ratio, with respect to the rotational speed of the collecting cylinder  11 . Every second time that the grippers  12 , or the folding blades  18 , when the folding apparatus is operating in fold production mode, pass through the transfer gap  14 , their movement is prevented by the disks. The result is the product being held by the relevant grippers  12  again passes the point  13 , where another product is placed upon it, and both products are then transferred, in collect production, together to the folding jaw cylinder  16 . 
     As was previously mentioned above, the grippers  12  and the folding blades  18  are each held on a different one of two-nested, cooperating parts of the collecting cylinder  11 . These two nested, cooperating parts of the collecting cylinder  11  can be rotated counter to one another to allow the distance between the grippers  12  and the folding blades  18  to be varied.  FIG. 1  shows a configuration of the collecting cylinder  11  in which the distance between each gripper  12  and a folding blade  18 , which can affect the product which is being held by the relevant gripper  12 , is adjusted to the maximum possible value. 
     If, as is particularly the case in fold production mode, in which a length of the products which are to be processed is less than twice the distance between a gripper  12  and its allocated folding blade  18 , this distance must be adjusted. The phase position of the grippers  12 , in relation to the conveyor belt device  07 , is left unchanged, so that, even after a suitable adjustment of the gripper and folding blade spacing, the leading edges of the products, which are being fed in by the conveyor belt device  07  can be gripped by the grippers  12 . Instead, the phase position of the part of the collecting cylinder  11  that holds the folding blades  18  is changed with respect to the part of the collecting cylinder  11  that holds the grippers  12 . The folding jaw cylinder  16  is rigidly rotatably coupled to this part of the collecting cylinder  11 , which carries the folding blade  18  via a toothed gear unit. The result is that folding blades  18  and folding jaws  19  meet one another at the transfer gap  14  even after adjustment of the gripper  12  and blade  18  spacing. The result is that when the distance between gripper  12  and the allocated folding blade  18  on the collecting cylinder  11  is not at the maximum, each gripper  17  of the folding jaw cylinder  16  passes through the transfer gap  14  shortly in front of, or before a gripper  12  of the collecting cylinder  11  passes through transfer gap  14 . To ensure that this folding jaw cylinder gripper  17  will not damage a product that is passing through the transfer gap  14  in collect operation without being transferred, the space between successive products on the collecting cylinder  11  must be large enough that the grippers  17  can extend through the transfer gap  14  without striking one of the products. In practice, this requires the provision of a space of approximately 6 cm in width between successive products on the collecting cylinder  11 . 
       FIG. 2  shows a side view of the folding apparatus in accordance with the present invention, in a representation which is generally analogous to that of  FIG. 1 . The movement of the grippers  17  of the folding jaw cylinder  16  is controlled via a cam disk  24 , which is arranged coaxially in relation to the folding jaw cylinder  16  and which cam disk  24  is traced by the rollers  23  of the grippers  17 . The cam disk  24  has two recesses  26 ;  27  on its circumference. One such recess  26  is located adjacent to the transfer gap  14 . The second recess  27  is situated near the vertex of the cam disk  24 . Coaxially to the cam disk  24  a cover disk  29  is provided. Cover disk  29  is rotatable in relation to the cam disk  24  and has recesses, two of which are identified here as  31 ;  32 . In the configuration of the folding device, which is shown in  FIG. 2 , and which corresponds to the book production mode without collection, the distance between the grippers  12  and the folding blades  18  of the collecting cylinder  11  is adjusted to the minimum. Each gripper  12  of the collecting cylinder  11  meets a gripper  17  of the folding jaw cylinder  16  at the transfer gap  14 . Moreover, the respective, cooperating recesses  26  and  31  and  27  and  32  respectively, of the can disk  24  and the cover disk  29 , overlap one another, so that the rollers  23  of grippers  17  of the folding jaw cylinder  16  can trace the contours of the recesses  26 ;  27  of the cam disk  24  with each revolution. The dipping of the roller  23  of one of the grippers  17  into the recess  26  causes the relevant gripper  17  to pivot into the released position shortly before passing through the transfer gap  14 , and to pivot into the holding position immediately after passing through the transfer gap  14 . This is done in order to allow the gripper  17  on the folding jaw cylinder  16  to securely clamp a product that is released by a gripper  12  of the collecting cylinder  11 , which gripper  12  is passing through the transfer gap  14  at the same time, against the folding jaw cylinder  16 . The product is conveyed, in this manner, on the circumference of the folding jaw cylinder  16  until the gripper  17  dips into the recess  27  and pivots to the released position, thereby releasing the product, which remained unfolded, when transferred from the collecting cylinder  11  to the folding jaw cylinder  16  in the transfer gap  14 . The released product is received by a conveyor belt device, which is identified as  33  and which is depicted in  FIG. 2 . 
     Shortly behind the grippers  12 ;  17 , the folding blades  18 , and folding jaws  19  which respectively are allocated to each of the folding blades  18 , pass through the transfer gap  14 . A cam disk, is arranged coaxially in relation to the collecting cylinder  11  and is provided for the purpose of controlling a release movement of the grippers  12  during passage through the transfer gap  14 . A cover disk is allocated to the folding blades  18  in a known manner. The cover disk is oriented, in the operating mode shown in  FIG. 2 , such that it prevents the rollers  23  of the folding blades  18  from engaging in a recess of the cam disk which controls the release movement of the grippers  12 . The cover disk of the folding blade  18  can be coupled with the location of the folding blade  18  on the collecting cylinder  11  in such a way that the folding blades  18  are automatically deactivated when the distance of the folding blades  18  from the grippers  12  is adjusted to the minimum. In this case, a folding operation, at this minimum distance, is excluded. Alternatively, control assemblies can be provided that will deactivate the folding blades  18  independently of their distance from the grippers  12 . This configuration allows folding operation, even with the minimum spacing. 
     A cam disk and a cover disk could also be allocated to the folding jaws  19  for the purpose of controlling their movement. However, the cover disk of such an assembly can also be omitted, as in book production mode it is not necessary to prevent the movement of the folding jaws  19  for the folding apparatus to function properly. Preferably, the folding jaws  19  are arranged so as to open and close in all production modes. In other words, they cannot be deactivated. 
     The folding apparatus in accordance with the present invention also supports book production modes, with collection. In a first such book production mode with collection, the supplied paper web  01  is divided into products in the cutting unit  02 . A length of each such product corresponds to ½ the circumference of a printing cylinder, and of a printing plate in the printing couple which is arranged upstream of the folding apparatus. If two different printing plates are mounted on a printing cylinder of the printing couple, two different printed pages can be generated alternatingly. These two different printed pages are then assembled via single collect operation in the folding apparatus to produce a printed product. Single collect operation requires that the grippers  12  of the collecting cylinder  11  open each time they pass the point  13  and alternatingly either open or remain closed when they are passing through the transfer gap  14 , in a generally known process. Combinations of cam disks and cover disks, which enable such an operation, are known in the art and do not need to be described at this point. To ensure that products passing through the transfer gap  14 , and remaining on the collecting cylinder  11  during collect production, are not gripped by the grippers  17  of the folding jaw cylinder  16  and damaged, by being held securely by the grippers  12  and  17  at the same time, it is necessary, in single collect operation, to also implement a control of the grippers  17 , which control will prevent the grippers  17  from moving with every second passage of these grippers  17  through the transfer gap  14 . A cam disk/cover disk combination, which provides this operation, can be structured substantially analogous to that of the collecting cylinder  11  and is therefore not represented here in detail. 
     In a second, double collect book production mode, the supplied paper web  01  is divided into products in the cutting unit  02 , with the length of each product corresponding to one-third the circumference of a printing cylinder, especially to one-third of the circumference of a forme cylinder of a printing couple which is located upstream. In other words, one of two printing plates that are mounted on the printing cylinder contains pages a 1 , a 2 , b 1  and the other contains pages b 2 , c 1 , c 2 , and the cutting unit  02  supplies products containing pages a 1 , a 2  or b 1 , b 2  or c 1 , c 2 , respectively. These products, which are shorter than those of the first collect book production mode, are greatly accelerated in the conveyor belt device  07 , so that each of them strikes a gripper  12  of the collecting cylinder  11 . A combination of cam disk and cover disk suitable for this purpose is generally known in the art and will not be described in detail here. A corresponding combination is also provided on the folding jaw cylinder  16 , to ensure that each of its grippers  17  passes through the transfer gap  14  twice in the closed position, and grips the collected products, which are then released by the collecting cylinder  11 , only during its third passage through the transfer gap  14 . 
       FIG. 3  shows the folding apparatus, in accordance with the present invention, in fold production mode. The relative phase positions of the part of the collecting cylinder  11  that holds the grippers  12  and the part of the collecting cylinder  11  that holds the folding blades  18 , or the folding jaw cylinder  16 , are the same as was the case in the configuration of  FIG. 2 . Shown in  FIG. 3  is a moment in the operational sequence which a folding blade  18  and a folding jaw  19  are both passing through the transfer gap  14 . The folding blade  18  is pressing a product, that has just been released by the adjacent associated gripper  12 , into the folding jaw  19 . In this operating mode, the cover disk  29  is rotated, in relation to the cam disk  24 , so that the recesses  26 ;  31  and  27 ;  32  respectively of the cam disk  24  and the associated cover disk  29  never overlap one another. The grippers  17  of the folding jaw cylinder  16  are thus completely deactivated. In each case, the folding jaws  19  close shortly after passing through the transfer gap  14  and open at a transfer point  34 . Products, that have been inserted by the folding blades  18  into the folding jaws  19  at the transfer gap  14 , are conveyed past the conveyor belt device  33  and are conveyed up to the transfer point  34 . At this transfer point  34 , the products are received by another conveyor belt device, which is not shown in  FIG. 3 , which separate, not depicted conveyor belt device delivers them to a paddle wheel, which, in turn, places them, in a stream, on a conveyor belt. 
       FIG. 4  shows the folding apparatus, in accordance with the present invention, again in a fold production mode, but in this configuration adjusted to process products of greater length than those depicted and discussed in the configuration of  FIG. 3 . To adjust to these greater length products, the distance between the grippers  12  and the folding blades  18  which are allocated to each of them on the collecting cylinder  11  is increased. This distance is now greater than the fixed distance between each gripper  17 , and the folding jaw  19  which is allocated to it, on the folding jaw cylinder  16 . Thus, each of the folding jaw cylinder grippers  17  pass through the transfer gap  14  behind a collecting cylinder gripper  12 , and in front of, or before the folding blade  18  which is allocated to this collecting cylinder gripper, simultaneously with a product that is held by the gripper  12 . However, because the cover disk  29  is covering the recess  26  of the cam disk  24 , as was already discussed and depicted in connection with  FIG. 3 , the gripper  17  remains immovably in the holding position as it passes through the transfer gap  14 , and does not come into contact with the product that is passing through the transfer gap  14  at the same time. Thus, for the intermediate spacing between successive products on the collecting cylinder  11 , it is necessary to provide only as much space as is required for the proper functioning of its grippers  12 . This distance is typically 25 mm. To achieve this spacing, and assuming that the products are 50 cm in length, the conveyor belt device  07  and the collecting cylinder  11  need to travel only 5% faster than the intake speed of the paper web  01 . In significant contrast, an intermediate space of 6 cm, as was required in prior devices, requires a speed difference of 12%. This means that if the collecting cylinder  11  and the folding jaw cylinder  16  are rotating at a maximum speed, which is typically determined by their structure, the folding assembly in accordance with the present invention allows the paper web  01  to run 7% faster, thereby increasing productivity by the same percentage. Furthermore, due to the reduced or decreased difference between the intake speed of the paper web  01  into the cutting unit  02 , and the travel speed of the conveyor belt device  07 , the danger that the leading end of the paper web  01 , which is becoming engaged in the conveyor belt device  07  but which has not yet been cut off from the rest of the web by the cutting unit  02 , will be damaged, as a result of friction against the belts  08 ;  09 , is decreased. 
     The grippers  17  of the folding jaw cylinder  16  are allowed to pass through the transfer gap  14 , together with a product being held by a gripper  12  of the collecting cylinder  11 . In the folding jaw cylinder  16  shown in  FIG. 4 , the grippers  17  and the folding jaws  19  are distributed approximately evenly around the circumference of the folding jaw cylinder  16 . This results in an open arrangement of grippers  17  and folding jaws  19 , which makes it easy to configure them so as to prevent their mutual functional disruption, and so as to ensure their easy access for repairs. 
     In fold production mode, as depicted in  FIGS. 3 and 4 , a suitable configuration of cam disks and cover disks, that is generally known in the art, also enables single or double collection wherein the folding blades  18  extend, to insert the products into the folding jaws  19 , only with every second or third passage of the folding blades  18  through the transfer gap  14 . An analogous control of the folding jaws  19 , which causes them to open and close only with every second or third passage through the transfer gap  14 , is conceivable, but is not absolutely necessary for the proper functioning of the folding apparatus. 
     The above-described configuration of the folding apparatus, in accordance with the present invention, facilitates a high level of productivity in both book production mode and fold production mode. Products having a page length that does not cover the entire circumference of the collecting cylinder  11  can also be produced economically. The possibility of producing three products from two printing plate lengths, and of employing single or double collection as needed, increases the flexibility of the apparatus substantially. 
     While preferred embodiments of the folding apparatuses with a folding blade cylinder and a folding jaw cylinder, in accordance with the present invention, have been set forth fully and completely, it will be apparent to one of skill in the art that changes in, for example, the drives for the cylinders, the types of web being folded, the product delivery devices, and the like could be made without departing from the true spirit and scope of the present invention which is accordingly to be limited only by the following claims.

Technology Classification (CPC): 1