Abstract:
An assembly for turning bundles includes a planar surface that receives bundles from an upstream station. A sensor detects movement of the bundle toward the surface and initiates a timing sequence. The sequence includes slowing the bundle over the surface so that it does not contact the stop at high speed. The stop is then retracted after the bundle movement is terminated and a portion of the surface is lifted and rotated through approximately ninety degress to re-orient the bundle. After the bundle is lowered to the planar surface, it is then advanced by a drive assembly from the surface toward a downstream station.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of U.S. provisional application Serial No. 60/086,893, filed May 27, 1998. 
    
    
     BACKGROUND OF THE INVENTION 
     The present application is directed to an apparatus used for turning bundles as encountered in the mailroom industry. That is, bundles of printed product, such as newspapers in individual bundles, are advanced downstream in a processing line. Typically, a bundle turn assembly is located between adjacent strapping machines where a strap is placed about a completed bundle in one direction, the bundle rotated through ninety degrees, and a strap then applied to the bundle in a perpendicular direction. Thus, it is necessary to detect the location of the bundle as it proceeds downstream. The bundle is then stopped, rotated, and advanced downstream to the next work station. Of course, it will be appreciated that the invention may find application in other areas and for related environments. 
     SUMMARY OF THE INVENTION 
     There is provided an assembly for turning bundles that includes a receiving surface adapted to receive bundles from an upstream station and advance the bundles toward a stop. A lift mechanism lifts and rotates the bundle through approximately ninety degrees. A drive assembly then removes the bundle from the surface and advances it toward a downstream station. 
     A sensor is preferably provided to detect movement of the bundle toward the surface. A timing sequence is initiated in response to a signal from the sensor. The bundle is slowed over the surface so that the bundle does not contact the stop at high speed. The stop is then retracted after the bundle is stopped and a portion of the surface is lifted and rotated through approximately ninety degrees to re-orient the bundle. The bundle is then advanced from the surface toward a downstream station. 
     The lift and rotate mechanism is preferably a ring that engages a lower surface of the bundle an d engages the bundle over an annular area during the lift and rotation movement. 
     A benefit of the invention resides in the ability to accurately receive, stop, rotate, and advance the bundle from the surface. 
     Another benefit of the invention is found in the simplified structure that performs the bundle rotation. 
     Still other features and benefits of the invention will become apparent to those skilled in the art upon reading and understanding the following detailed description. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an elevational view of a preferred form of bundle turn assembly. 
     FIG. 2 is an end elevational view taken generally from the right-hand side of FIG.  1 . 
     FIG. 3 is a top plan view taken generally along the lines  3 — 3  of FIG.  2 . 
     FIG. 4 is a schematic representation of the fluid system used to stop the bundle, lift the bundle, rotate the bundle through ninety degrees, and advance the bundle toward the downstream work station. 
     FIG. 5 is an elevational view of the mechanism for driving the belts. 
     FIG. 6 is an end elevational view taken generally from the right-hand side of FIG.  5 . 
     FIG. 7 is a top plan view of the assembly of FIG.  5 . 
     FIG. 8 is an elevational view of the stop assembly. 
     FIG. 9 is an end elevational view taken generally from the right-hand side of FIG.  8 . 
     FIG. 10 is a top plan view taken generally from the lines  10 — 10  of FIG.  9 . 
     FIG. 11 is a top plan view of the bundle turn assembly with selected components removed for ease of illustration. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Turning initially to FIGS. 1-3, the bundle turn assembly A includes a frame  20  that is preferably on caster wheels  22  so that it can be conveniently positioned at various locations along a process line (not shown). The frame supports a table top  24  (FIG. 3) that has an inlet or upstream portion  26  and a downstream or outlet portion  28 . Thus, as illustrated, stacks or bundles of printed products (shown in dotted line in FIG. 2) are received along the right-hand side of FIGS. 2 and 3, stopped centrally on the top surface, and proceed downstream to the left as shown in FIGS. 2 and 3. To facilitate this movement, one or more rollers  40  are provided along the inlet portion  26 . In a preferred arrangement, an elongated roller  42  is provided along the peripheral edge of the assembly and a series of smaller length rollers  44  are disposed inboard thereof. As will be appreciated, these rollers each have generally horizontal axes and allow free rolling movement of the bundle thereover. 
     Positioned between the rollers, or at any other convenient location in the inlet portion  26 , is a sensor  50 . The preferred form of sensor is a photoelectric element that provides a signal once the bundle enters the inlet portion of the assembly. The sensor starts a timing sequence which ultimately results in the lifting and rotation of the bundle through ninety degrees as described further below. 
     The bundle proceeds leftwardly as shown in FIGS. 2 and 3 where it proceeds over a central portion  52  that includes at least one drive belt and is in the preferred arrangement, a pair of drive belts  54 . The drive belts are synchronously operated and provide a symmetrical engagement along the bottom surface of the bundle, urging the bundle a predetermined amount toward the outlet portion  28 . Based on the timing signal provided by the sensor, rotation of these belts is terminated once the bundle is centrally located over a ring  56 . This also coincides with engagement of a forward surface of the bundle with stops  58 . In a preferred arrangement, the stops are defined by rods that are selectively extended and retracted relative to the table top. The rods are actuated by a piston/cylinder assembly  60  disposed beneath the table. When the rod of the piston/cylinder assembly is extended, the stops  58  protrude upwardly from the upper surface of the table (FIGS.  1  and  2 ). Leftward movement of the bundle as shown in FIGS. 2 and 3 is then precluded through engagement with the stops. The timer also terminates rotation of the belts  54  at the time that the bundle engages the stops. Thus, the bundle is gradually slowed down by the belts so that it does not engage the stops at a high rate of speed which would otherwise tend to topple the bundle of printed material. 
     Once the bundle has come to an at-rest position, individual pins  68  circumferentially spaced along the ring  56  are urged upwardly by fluid pressure. That is, a series of individual cylinders are located beneath the table top below the annular ring  56 . The pins are simultaneously urged upwardly to lift the bundle a predetermined dimension, for example approximately one inch above the table surface. If desired, two or more pins may be interconnected by an annular plate that receives the bundle thereon and engages the lower surface of the bundle along a substantial portion of an annulus as opposed to discrete pin points. 
     Once the bundle has been lifted, the ring  56  is rotated by cylinder  72 . Thus, the entire ring, including the pins and cylinders that lift the pins upwardly, are rotated ninety degrees by the large cylinder  72 . Since the cylinder is disposed at an angle, its stroke rotates the ring, and thus the bundle, and once the ring has completed its ninety degree rotation, the pins are de-actuated or recessed into the ring. The bundle is thus lowered onto the table surface and the belts  54  driven to advance the bundle toward the outlet portion  28 . 
     In a preferred arrangement, outlet rollers  74  facilitate movement of the bundle toward a downstream work station. Particularly, the downstream rollers include an elongated roller  76  along the peripheral edge of the table top and one or more drive rollers  78  that are driven by belts  80  from beneath the table to advance the bundle from the table surface. As will be appreciated, during the rotation and movement of the bundle off the table surface, the stops are recessed below the table surface. Once the bundle is clear of the table surface, the stops are then urged upwardly to their position shown in FIGS. 1 and 2 to receive the next bundle. 
     FIG. 4 illustrates the fluid system that operates the various cylinders and pins that lift and rotate the bundle. Reference numeral  82  identifies the source of fluid pressure conveyed by way of fluid lines and couplings, and a series of valves  84 . Fluid pressure is selectively provided to cylinder  60  that operates the stops. Through the second valve  84   b , fluid is simultaneously provided to cylinder  60  associated with the pins  68 . Fluid pressure is selectively controlled to cylinder  72  via the third valve  84   c . As described above, the cylinder  72  is selectively extended and retracted to impart ninety degree rotation to the ring. 
     FIGS. 5-7 illustrate the drive mechanism for the belts  54  disposed in a central portion of the table surface. As shown, a motor  90  drives a main belt  92 . A pair of pulleys  94 ,  96  are, in turn, driven by the belt and used to drive belts  54  associated with a central portion of the assembly and the belts  80  associated with the outfeed section  28 . As will be recognized, these belts  54 ,  80  are thus driven in synchronous relation since pulleys  94 ,  96  are driven by the same belt  92 . A series of idler and driven pulleys (unnumbered) are used to complete the drive belt circuit in a manner well known in the art. The central column  98  (FIG. 6) stays fixed relative to the frame so that when the ring is selectively rotated by cylinder  72 , the drive belts  54  remain oriented in the same direction. Thus, the belts  54  advance the bundle of printed product into engagement with the stops  58 , and then selectively assist drive belts  80  to advance the bundle toward the outlet portion  28  of the assembly. 
     FIGS. 8-10 illustrate the stop mechanism associated with the fluid pressure system. As described above, fluid cylinders  60  cooperate with the stop members  58  as flow is regulated through valve  84   a . The stop members are normally extended so as to preclude downstream advancement of the bundle. Once the sensor detects an incoming bundle, the timing sequence is initiated whereby the bundle travels across the table surface, engages the stops, and the pins are selectively raised before rotation of the table. Just prior to rotation, the stops are retracted, and the entire bundle is rotated ninety degrees on the ring. Once the bundle has exited the table surface, the stops are biased outwardly for receipt of the next bundle. The stops may also be adjusted toward and away from the terminal edge of the table. This allows different size bundles to be accommodated on the bundle turner assembly. 
     It will also be recognized that the preferred embodiment can adopt various configurations. For example, individual cylinders may be used to lift the pins, and thus the bundle, above the surface of the table. Alternatively, an arcuate plate can be lifted by one or more cylinders so that the action of these individual cylinders  70  can be coordinated. 
     It is also preferred that the roller  78  be driven via belts  80 . This assures that the bundle clears the table by way of a positive drive arrangement as opposed to the bundle potentially catching an edge on the adjacent downstream conveyer path which may alter the orientation of the bundle. Since the bundle is typically proceeding to a strapping assembly, it is important that proper orientation of the bundle be maintained. 
     The invention has been described with reference to the preferred embodiments. Of course, other arrangements of a minor variation are contemplated. The invention is intended to include all such alterations and modifications in so far as they come within the scope of the appended claims or the equivalents thereof.