This application claims the priority of European Patent Document EP 08405077.2, filed on Mar. 14, 2008, the subject matter of which is incorporated herein by reference.
The invention relates to a conveying arrangement for the takeover and transfer of printed products, the arrangement comprising a feed conveyor for successively transporting separate printed products to a takeover region and an intermediate conveyor for transporting the printed products from the takeover region to a transfer region, provided with a plurality of conveying elements along a continuously circulating track, which are designed to grip the individual printed products and transport these products from the takeover region to the transfer region where they can be transferred to a different transporting device. In the low performance range, the printed products can be transferred without the intermediate conveyor directly to the containers, for example to pouches or conduits. At higher speeds, however, the printed products can roll up or bounce back during the insertion, thus interrupting further processing. Thick products or stacks of products will impact with the containers owing to their high weight and the high speed.
Conveying arrangements of this type have long been known in the print processing industry. One such conveying arrangement is known, for example, from European Patent Document EP-A-1 234 791, in which the intermediate conveyor is provided with a plurality of circulating compartments that can open up when approaching a feed conveyor and can close for the further transport of the printed products. The feed conveyor is a transporter provided with suspended clamps that will open up in the aforementioned approach region. In the transfer region, the compartments of the intermediate conveyor are opened so that the printed products drop freely into the pouch-type receiving elements of an inserting machine.
European Patent Document EP-A-1 270 476 discloses a conveying arrangement where the printed products are removed from a stack with the aid of a traction mechanism and are supplied to an inserting machine that is provided with a plurality of pouches. The traction mechanism includes jointly operating pairs of rollers, between which the printed products are gripped and then released to the pouches in a transfer region.
European Patent Document EP-A-0 380 921 discloses an arrangement for taking over and transferring printed sheets or signatures, using an intermediate conveyor that is also provided with a plurality of clamps that are opened in a transfer region. The intermediate conveyor is embodied as a wheel and is provided along the periphery with a plurality of compartments, which are opened up in the transfer region, so that the products can drop freely into the pouches of an inserting machine.
The problem with the aforementioned conveying arrangements is that at extremely high speeds the printed products are not released carefully to the containers, which can cause the printed products to roll up and result in a delayed and unsatisfactory positioning of these printed products in the containers.
It is an object of the present invention to create a conveying arrangement that permits a more careful release of the printed products or the previously collected stacks of products for further processing, even at a higher speed or output rate.
The above and other objects are accomplished according to one aspect of the invention wherein there is provided a conveying arrangement for printed products that includes a feed conveyor to successively transport the printed products in a transporting direction to a takeover region, a transporting device having a transfer region to receive the printed products, and a circulating intermediate conveyor to transport the printed products from the takeover region to the transfer region of the transporting device. The circulating intermediate conveyor includes an endless track having a plurality of conveying elements to respectively grip the printed products and transport the gripped printed products from the takeover region to the transfer region where the printed products are transferred to the transporting device. The conveying elements have a swiveling axis that extends transverse to the transporting direction, wherein at least in an area between the takeover region and the transfer region, the conveying elements execute a controlled swiveling movement around the swiveling axis.
In one embodiment, a generic conveying arrangement of this type may be controlled by the swiveling motion of the conveying elements for orienting the printed products in the transfer area, wherein these elements may be respectively swiveled around an axis extending transverse to the transporting direction. With the aid of the conveying arrangement and as a result of the swiveling motion of the individual elements, it is possible to track the movement of the containers in the transfer region with an optimum orientation of the printed products and to release the printed products with an optimum orientation and speed to the containers. The arrangement according to this embodiment makes it possible for the printed products follow the containers precisely during insertion. In principle, it can be said that the smaller the angle between the speed vectors for the containers and the supplied printed products and the smaller the difference in speed, the more gentle and careful the insertion of the printed products.
In another embodiment, the feed conveyor may be a belt conveyor to convey printed products that are uniformly spaced apart or which are arranged in an overlapping flow. In the transfer region, the printed products are respectively transferred to a conveying element that handles the further transport. In principle, a different conveying arrangement may also be used in place of the belt conveyor, for example one that is provided with clamps.
In an embodiment, the feed conveyor may extend substantially tangential to the intermediate conveyor, at least in the transfer region, wherein the transport in this region may occur vertically, from the top to the bottom. However, the products can in principle also be transported from the bottom to the top, in a horizontal direction, or at an angle.
In another embodiment, the individual conveying elements may each be provided with a transport member for transporting the printed products positioned on the respective conveying element. As a result, it is possible to compensate for a speed difference between the feed conveyor and the intermediate conveyor. The printed products can be slowed down or accelerated while positioned on the individual conveying elements. For example, if these printed products are supplied in an overlapping flow, for example only a slight overlap, to the intermediate conveyor, then the products in the overlapping flow can be pulled apart while positioned on the intermediate conveyor because they are individually transported on the separate conveying elements. Alternatively, it may also be possible to reduce the spacing between the individual printed products while these are positioned on the intermediate conveyor.
In an alternative embodiment, an especially secure and comparatively simple drive for the transport members may be obtained if the intermediate conveyor is provided with at least one drive cam, which respectively engages in the transport members in the transfer region, thereby moving the respective printed products on the conveying element.
In an embodiment, the intermediate conveyor may be provided with at least one second drive cam, which engages in the transport members in the transfer region, to remove and thus transfer the printed products from the respective conveying element. As a result, the printed products can be inserted into pouches even at high speeds. The transport members may be provided with at least one transport roller, on which the printed products are supported by resting against the respective conveying element. By correspondingly turning the transport rollers in one direction or the other, the printed products can be accelerated or slowed down.
A first drive cam is advantageously provided in the takeover region while a second drive cam is provided in the transfer region. As a result, it is possible to accelerate as well as slow down the printed products in both regions, thereby resulting in an especially high flexibility and an optimum transfer of the printed products.
In another embodiment, the conveying elements may be respectively provided with at least one clamp for clamping the individual printed products against a support surface of the respective conveying element. With these clamps, the printed products can be held in the respective takeover region against the respective conveying element and can thus be transported safely. According to another modified embodiment, the clamps may be arranged to swivel on the conveying element. By swiveling them in and out, the printed products can be clamped in or released. A spring may be arranged such that if the clamp is swiveled in, the printed product is clamped in. With the aid of a control cam for counteracting the spring force, the clamp can again be opened up and the printed products released.
According to a different embodiment, at least one clamp may be embodied such that the clamped-in printed products can be moved in a transporting direction or counter to the transporting direction, respectively on an outside surface of the conveying element. For this, the clamps are provided with rollers to permit the aforementioned movements. The individual printed products are thus clamped against the conveying element with at least one clamp, but may be moved in a conveying direction or counter to the conveying direction while positioned on the conveying element. As a result, it is possible to accelerate or slow down the printed products in the takeover region as well as in the transfer region, as mentioned above, while simultaneously providing a secure guidance.
According to one embodiment, the intermediate conveyor may be provided with a cam for swiveling the conveying elements and the conveying elements may be provided with a cam roller, which engages at least in some sections in the cam and thus permits a particularly secure swiveling of the conveying elements in the transfer region. The swiveling movement can be adjusted precisely and can also be changed by correspondingly adjusting the cam.
Another embodiment provides that the intermediate conveyor may be embodied as a wheel and that the conveying elements may be arranged along the periphery of the wheel. It is therefore advantageous if the endless track of the conveying elements is a circular track. However, a different track, for example an oval track, may also be used in principle.
In another embodiment, the conveying elements may include one outer support surface for the printed products, wherein these support surfaces respectively function as an outer shell surface of the wheel when the individual conveying element is in the basic position. It is advantageous if the support surfaces jointly form a circular surface in the takeover region, to which the printed products can be supplied, for example tangentially, and can thus be taken over. Following the takeover region, the conveying elements can be swiveled with a front edge toward the outside or toward the inside.
In an embodiment, the printed products may be transferred to a conveying arrangement provided with pouches, into which the printed products may be inserted and in particular may be tossed from the top. These pouches, for example, can be the pouches of an inserting machine and may be arranged in the form of a ring as shown in European Patent Document EP-A-1 234 791. However, other holding devices, for example clamps and the like, can also be provided in place of the pouches.
Additional advantageous features follow from the dependent claims, the description below, as well as the drawings.
The present invention will be more readily understood from the following detailed description when read in conjunction with the accompanying drawings, in which:
a and 7b are enlarged views of the takeover region shown in
An embodiment of the conveying arrangement 1, shown in
The feed conveyor 2 takes over the printed products 6 from a device (not shown) and conveys these products between two conveying belts 4 and 5, shown only in some sections of
The intermediate conveyor 3 comprises a wheel 7 with two star-shaped plates 35 and 36 (
To ensure that each of the printed products 6 can be gripped and transported by the conveying elements 9, these conveying elements are respectively provided with two clamps 10 that may be swiveled around a swiveling axis 43, as shown in
Downstream of the takeover region A, the printed products 6 are respectively held in place on the conveying elements 9 so that they may be transported on these elements.
It is furthermore conceivable that the cams 30, 31 are embodied in the form of a ring, which could be driven to rotate around the axis 8, thus also making it possible to change the transporting speed of the conveying elements 9.
Once the drive component 26 engages in the cam 30, a printed product 6′″ can be driven in the transfer region B and, if desired, can be accelerated, so that it is released by the respective conveying element 9 and inserted into a pouch 14. The engagement and the operating range of the cam 30 follows that of the cam 31 and is located in the lower portion of the wheel 7, as shown in
A different and essential function of the conveying elements 9 is that they can be swiveled around the axis 27. According to
It is furthermore essential that the pouches 14 are also treated with care. Each of the pouches comprises an inside area 15 and a different inside area 16, as well as a bottom 18. The printed products 6 are dropped into the pouches through an upper opening 17. During the downward drop, the printed products 6 are for the most part directed toward the inside area 15 and the bottom 18. The inserted printed products 6 finally come to rest against the inside area 16, as shown in
Once the printed product 6 has finally been released to the transporting device 34, the conveying elements 9 along with the cam 29 are swiveled back to the starting position, which is approximately the 11 o'clock position as shown in
It is also critical that the printed products 6 are held in place by the two clamps 10 during the transfer to the transporting device 34. The printed products 6 are thus held in place and guided while they are transported on the respective conveying element 9, until they are released completely. With the embodiment as shown, the printed products 6 are inserted into empty pouches 14, wherein these pouches 14 or other containers can already contain a printed product that is also opened, thus making it possible to insert the printed products 6 as inserts into different printed products. It is also important in that case to have a careful, flowing and clocked transfer, which ensures that the printed products 6 in the form of inserts are placed precisely. Such a careful and precise transfer is critical even if other types of containers are used or if clamps, for example, are used in place of the pouches 14.
According to the embodiment described
It will be understood that the above description of the present invention is susceptible to various modifications, changes and adaptations, and the same are intended to be comprehended within the meaning and range of equivalents of the appended claims.
Number | Date | Country | Kind |
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08405077 | Mar 2008 | EP | regional |
Number | Name | Date | Kind |
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6196538 | Stauber et al. | Mar 2001 | B1 |
6612563 | Noll, Jr. | Sep 2003 | B1 |
6619651 | Mader | Sep 2003 | B2 |
6698742 | Hansch | Mar 2004 | B2 |
20070216082 | Fenile et al. | Sep 2007 | A1 |
Number | Date | Country |
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197 33 694 | May 1998 | DE |
0 380 921 | Aug 1990 | EP |
1 234 791 | Aug 2002 | EP |
1 270 476 | Jan 2003 | EP |
2 334 711 | Jan 1999 | GB |
Number | Date | Country | |
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20090230614 A1 | Sep 2009 | US |