Abstract:
In an envelope-filling station for mail processing systems having an envelope-feeding arrangement for single, open envelopes, an intermediate envelope-conveying arrangement extending at an angle thereto in the direction of an angle stop arrangement provided for the purpose of aligning the envelope, and an envelope-advancing arrangement from which the envelopes are accepted from the angle stop arrangement, a simplification of the design, and effort needed to control the component parts is achieved when the angle stop arrangement, with the exception of a stopping straightedge that is to be provided to achieve extremely precise alignment of an envelope that is supplied at an angle, contains as a further part of the angle stop arrangement a conveying nip between the upper strand of an intermittently driven conveying belt of the envelope-advancing arrangement and a pressure-exerting roller that is pre-tensioned near the beginning of the upper strand of this conveying belt. The envelope-advancing arrangement has coupling means following the pressure-exerting roller that interact with the intermittently driven upper strand of the conveying belt of this envelope-advancing arrangement, in particular a roller bar that can be moved up and down, said means conveying an aligned envelope to a position in front of the feeding station, independent of the function of the pressure-exerting roller, and transporting the filled envelope out of the inserting station.

Description:
BACKGROUND OF THE INVENTION 
   The invention relates to an envelope-filling station for mail processing systems. 
   An envelope-filling station of this type is disclosed in German patent 10220908 C1. It contains an envelope-conveying device having an envelope-feeding arrangement that extends works essentially in the horizontal plane, approximately in the horizontal plane of the surface of an envelope-filling table, an envelope-conveying arrangement which follows this intermediate envelope-conveying arrangement extending at an angle relative to the conveying direction of the envelope-feeding arrangement, and a following envelope-advancing arrangement, whose conveying direction is horizontally perpendicular to the conveying direction of the envelope-feeding arrangement and is perpendicular to the inserting direction of an intermediate envelope-conveying arrangement that is located next to the enclosure-inserting station. 
   In the disclosed envelope-filling station, the intermediate envelope-conveying arrangement that is angled relative to the envelope-feeding arrangement and that is angled relative to the envelope-advancing arrangement is dimensioned and located in such a way that the open envelopes are conveyed to a position directly in front of the enclosure inserting station, and there the opened envelopes are aligned precisely in front of the inserting station in conjunction with an angle stop arrangement, whereby an envelope in the feed station is filled with enclosures or enclosure sets and is then transported away by the envelope-advancing arrangement after the angle stop arrangement is switched to an inactive status. 
   With the prior-art envelope-filling station, if, after a part of the angle stop arrangement is switched to an inactive status, the filled envelope is transferred to the envelope-advancing arrangement, a residual stroke from the inserting arrangement can be used for this transfer. However, if the filled envelope is to be transferred to an envelope-advancing arrangement that is located perpendicular to the insert direction, this transfer must be initiated by the further operation of the angled intermediate envelope-conveying arrangement after the deactivation of the corresponding part of the angle stop apparatus. This can lead to problems when envelopes are filled with a relatively heavy content and when there are unfavorable friction ratios between the upper surface of the envelope-filling table and the lower side of the filled envelope. 
   Moreover, with the prior-art envelope-filling station it can become difficult in the area of the angled intermediate envelope-conveying arrangement to arrange the conveying belts, which extend at an angle relative to the conveying direction of the envelope-feeding arrangement, and thus the hold-down means that work together with said belts and are embodied as rollers or rolling bodies held in cages, on the envelope-filling table in such a way that an envelope that is to be filled reaches the area in front of the inserting station in complete form, and at the same time remains accessible from above on its path, for example to correct problems. 
   Finally, it may be desirable to simplify the design of the transition from the intermediate envelope-conveying arrangement to the envelope-advancing arrangement that is perpendicular to the inserting direction of the inserting station. 
   SUMMARY OF THE INVENTION 
   Accordingly, the object of the present invention an envelope-filling station that, with a simplification of the construction and of the system controlling the component parts, envelopes are conveyed at a high working speed to a position in front of the enclosure-inserting station and, when there is a comparatively heavy enclosure content, the envelopes can be transferred reliably to an envelope-advancing arrangement that is oriented perpendicular to the inserting direction. 
   German patent publication 10015756 A1 does disclose an envelope-advancing arrangement in the form of a conveying belt that passes transversely in front of an inserting station and a roller bar that can be moved up and down, and this prior-art envelope-advancing arrangement is also responsible for positioning the open envelope in front of the inserting station and for withdrawing the filled envelope from the inserting station. 
   However, in the envelope-filling station disclosed here, the pressure-exerting roller that interacts with the top strand of the intermittently driven conveying belt of the envelope-advancing arrangement and is pre-stressed in a downward direction performs a stop function independently of the cyclical control of the coupling means that interact with the upper stand of the conveying belt of the envelope-advancing arrangement, in particular independently of the upward and downward movements of the roller bar, and said stop function does not require a separate control means, which reduces the entire expense required for control. 

   
     DESCRIPTION OF THE DRAWING 
     The invention is explained in greater detail below based on an example of an embodiment, with reference being made to the drawings. 
     The drawing contains a single FIGURE showing a schematic and perspective view of an envelope-filling station of the type described herein. 
   

   DETAILED DESCRIPTION 
   The drawing shows an L-shaped section of an envelope-filling table  1 , which is drawn as a single piece in order to define the working plane of the envelope-filling station. However, in actual embodiments sections of envelope-conveying tables or envelope-filling tables that can be moved relative to each other are provided in a manner that corresponds to the requirements of the individual system components. 
   The upper strands  4  and  5  of a continuous conveying belt or conveying belts  7  and  8  of an envelope-feeding arrangement  9  that can be placed in motion by a drive  6  extend through the slots  2  and  3  of an envelope-filling table section  1   a . The upper strands  4  and  5  of the conveying belts  7  and  8  work together with hold-down means in the form of roller bearings  10  and  11  guided in cages. Rows of such rolling bodies may be provided along the length of the conveying belts. 
   The envelope-feeding arrangement  9  delivers a stream of single, open envelopes in an essentially horizontal plane defined by the envelope-filling table  1 , whereby such an envelope is identified as  12  and is depicted in a lying position at the end of the envelope-feeding arrangement  9 . 
   An intermediate envelope-conveying arrangement  13  follows the envelope-feeding arrangement. It grips the leading envelope edge (relative to the conveying direction as shown by arrow P 1 ) of each conveyed envelope, and withdraws the envelope from a region of the envelope-feeding arrangement  9 . This area of the envelope-feeding arrangement  9  permits a movement having a component that is transverse to the conveying direction, as indicated by arrow P 1 , of the envelope-feeding arrangement  9 , since such a partial transverse movement of the envelope  12  is not hindered by the hold-down means  10  in the form of roller bodies and the frictional connection between the upper strands  4  and  5  of the conveying belts  7  and  8  and the lower side of the envelope  12  maintains a drive component in the direction of arrow P 1  but also permits a transverse component. 
   The intermediate envelope-conveying arrangement  13  is provided in order to convey the envelope  12  in a translatory movement at an angle of approximately 40° to approximately 60° relative to the conveying direction of the envelope-feeding arrangement  9 . For this purpose, slots  14 ,  15 , and  16  are provided in an envelope-filling section  1   b  at an angle corresponding to the aforesaid angle, through which the upper strands  17  and  18 , and  19 , respectively, of continuous rotating intermediate conveying arrangement conveying belts  20 ,  21 , or  22 , respectively, project. The intermediate conveying belts can be set in rotary motion by a drive  23 . 
   Hold-down rollers  26 , that are mounted on a support means  24  by means of side-mounted axles  25  and that, deviating from the simplified diagram shown in the drawing, are pre-stressed against the top strands of conveying belts  20 ,  21 , and  22 , interact with the intermediate conveying arrangement belts  20 ,  21 , and  22 . The rollers that are adjacent to the envelope-feeding arrangement  9  are also pre-stressed against the corresponding conveying belts of the intermediate envelope-conveying arrangement  13  to such an extent that, when the leading edge (relative to the conveying direction of the envelope-feeding arrangement  9 ) of an envelope  12  reaches the conveying nip between the adjacent hold-down rollers  26  on one side and the upper strands of the conveying belt  20 ,  21 , and  22 , the clamping of the envelope between these conveying nips is large enough as a result of the friction connection to the top and bottom of the envelope  12  being conveyed to initiate the aforesaid translatory movement of the envelope  12  and to cause the movement of the envelope in the direction of arrow P 2  long the intermediate conveying direction  13  to be continued. 
   This translatory movement of the envelope  12  in the area of the intermediate envelope-feeding arrangement  13  at an angle of 40 to 60° relative to the conveying direction of the envelope-conveying arrangement  9  corresponding to arrow P 1  continues until the previously referred-to leading closed edge of the envelope, which is opposite the envelope opening, strikes a stopping straightedge  27  that is installed in a section  1   c  of the envelope-filling table  1  in an orientation perpendicular to the conveying direction of the envelope-feeding arrangement  9  corresponding to arrow P 1 , and forms part of the stopping device  28  of the envelope-filling station. 
   While the precise orientation of the envelope  12  on the path along the envelope-feeding arrangement  9  and the precise orientation of the envelope upon transfer to the intermediate envelope-conveying arrangement  13  are not decisive, so that in these sections of the envelope-filling station additional lateral guides can be eliminated in the interest of simplifying the design and improving the accessibility of the envelope-filling table from above, now, as a result of the aforesaid leading edge of the envelope  12  striking the stopping straightedge  27 , the envelope  12  is precisely oriented in a direction in which the aforesaid leading edge extends perpendicular to the conveying direction of the envelope-feeding arrangement as shown by arrow P 1  and perpendicular to the inserting direction of an enclosure-inserting station  29 , which is described in greater detail below. The envelope  12  gains this orientation after the leading edge strikes the stopping straightedge  27  through continued operation of the conveying belts  20 ,  21 , and  22  of the intermediate envelope-conveying arrangement  13 , whereby the upper strands  17 ,  18 , and  19  of these conveying belts now only maintain a low frictional connection to the bottom of the envelope which is being conveyed in the intermediate arrangement, so that in section  1   c  of the envelope-filling table  1  the envelope can perform alignment movements in the plane of the envelope-filling table but, overall, a drive component of the intermediate envelope conveying arrangement  13  continues to be maintained in the direction of arrow P 2 . Moreover, in the area of the intermediate envelope-conveying arrangement  13  that is not fitted with hold-down rollers  26 , hold-down means of the type of the hold-down means  10  and  11  referred to above can interact with the upper strands of the conveying belts  20 ,  21 , and  22 , in order to increase the driving effect on the envelope  12  in the direction of the stopping straightedge  27  without hindering envelope movement parallel to the stopping straightedge  27 . 
   The movement of the envelope  12  that was just referred to above in a direction parallel to the stopping straightedge  27  in the direction of arrow P 3  continues until the side edge of the envelope  12  that is located next to the envelope opening and that is now the leading edge strikes the additional stopping means that belongs to the stopping device  28 , said additional stopping means being formed by the nip between the upper strand of an intermittently operated conveying belt  31  of the envelope-advancing arrangement  32  on one side, and on the other side, by the pressure-exerting roller  33  that is pre-stressed near the beginning of the top strand  30  of the conveying belt. The pre-stressing means for pre-stressing the pressure-exerting roller  33  downwards against the top strand  30  of the conveying belt  31  are shown schematically in the diagram at  34 . 
   When the envelope  12  reaches the angle stopping arrangement comprising the stopping straightedge  27  and the aforesaid nip between the conveying belt  31 , which for the time being remains motionless, and the spring-loaded pressure-exerting roller  33 , it assumes the position indicated at  12 ′ in the drawing. 
   If the conveying belt  31  is now caused to turn by a drive  35 , while at the same time conveying belts  20 ,  21 , and  22  continue to be turned by appurtenant drive  23 , the envelope is pulled from the position indicated at  12 ′ in the precise orientation that was established by stopping straightedge  27 , from section  1   c  of the envelope-filling table  1 , so that it reaches the area of the envelope-advancing arrangement  32 , which has an appurtenant roller bar  36  that can move up and down, said roller bar extending above the conveying belt  31  of the envelope-advancing arrangement  32  in the direction of arrow P 4  over the area ahead of the inserting station  29 . 
   The drive  35  for conveying belt  31  of the envelope-transferring arrangement  32  is controlled, possibly in conjunction with optical sensors that respond to the position of the envelope  12 , such optical barriers being familiar to persons skilled in the art, in such a way that the envelope reaches a precise position opposite the feeding station  29 , after which time the envelope is stopped. 
   It must be noted that in a non-depicted embodiment, the conveying belt  31  of the envelope-advancing arrangement  32  can also be formed by a perforated vacuum conveying belt that operates in a controllable manner by means of vacuum chambers that can be connected to a vacuum and depending on how the vacuum is applied to the vacuum chambers, the upper strand of the conveying belt establishes a force connection with the lower side of an envelope that is to be advanced. While in the embodiment described above the roller bar that can be moved up and down and that interacting with the upper strand of the conveying belt of the envelope-advancing arrangement forms coupling means, in a modified embodiment of the invention these coupling means are vacuum chambers that interact with the perforated vacuum conveying belt of the envelope-advancing arrangements and can be connected to a vacuum in a controllable manner. The perforated vacuum conveying belt of the envelope-advancing arrangement also interacts in this embodiment, which is not shown, with the pressure-exerting roller, which is pre-tensioned in a downward direction, to perform a stop function. 
   The inserting station  29  is located at the end of an enclosure collating path  37  that is oriented parallel to the inserting direction of the inserting station  29  and that in a generally known manner has conveying fingers that project over the surface of the collating path and are mounted on rotating chains or belts and that define enclosure conveying trays from which the inserting device  38  of the inserting station  29  takes enclosures or sets of enclosures in order to insert them into the envelope  12 , which is held open to receive them. Thus, when an envelope  12  is stopped by the envelope-advancing arrangement  32  at a precise location in front of the inserting station  29 , the roller bar is lifted by means of a drive  39 , which is represented schematically in the drawing, and the envelope is opened so that the inserting device  38  can insert the enclosure or the set of enclosures into the opened envelope. Then, by means of drive  39  the roller bar  36  is lowered onto the filled envelope and conveying belt  21  is set in motion again by drive  35 , and the filled envelope can be transported between the upper strand  30  of the conveying belt  31  from section  1   d  of the envelope-filling table  1  in the direction of an envelope-closing section  40  in the area of section  1   e  of the envelope-filling table  1 . 
   The envelope-closing section  40  contains a continuously revolving conveying belt  41  and a hold-down roller set  43  that interacts with the upper strand of this conveying belt  41  as well as a drive  44  for the movement of conveying belt  41 . The details of the envelope-closing section  41  are not included in the scope of the present invention and therefore are not explained in detail. It can be seen that with regard to the up and down movement of the roller bar  36  caused by drive  39 , the pressure-exerting roller  33  that is continuously pre-tensioned against the upper strand  30  of conveying belt  31  by the pre-tensioning means  34  does not follow these movements and, as a consequence, the pressure-exerting roller  33  in interacting with the upper strand of the intermittently driven conveying belt  31  remains active as a stopping means of the angle stopping device  28 , at least in the operating phases in which the conveying belt  31  of the envelope-advancing arrangement  32  is stopped. Thus, when the conveying belt  31  of the envelope-advancing arrangement  32  is stopped, the roller bar  36  is lifted by drive  39 , the envelope  12  that is positioned in front of the inserting station  29  is opened, and an enclosure or set of enclosures is inserted into the opened envelope, and then the roller bar  36  is lowered by drive  39 , during this entire time period a subsequent envelope can be supplied by the envelope-feeding arrangement  9 , accepted by the intermediate envelope-conveying arrangement  13 , and pushed by said intermediate envelope-conveying arrangement  13  against the alignment straightedge  27  to achieve alignment, and finally pushed ahead until the lateral edge of the envelope, which is now the leading edge, strikes the conveying nip between the upper strand  30  of the conveying belt  31  and the pressure-exerting roller  33 . If the drive  35  of conveying belt  31  of the envelope-advancing arrangement  32  is put into operation, then the filled envelope is simultaneously transported from section  1   d  of the envelope-filling table  1  to section  1   e  of the envelope-filling table  1 , and the aligned envelope, which despite the continued operation of conveying belts  20 ,  21 ,  22  is stopped in the stopping device, is conveyed to the position in front of the inserting station  29  corresponding to position  12 . 
   This means that the portion of the angle stop device  28  that is formed by the upper strand  30  and the pressure-exerting roller  33  eliminates the need for separately actuated and separately controlled stopping means and that at the same time different handling can occur taking into account the different friction and weight characteristics of the unfilled envelope and of the filled envelope at the transition from an alignment area corresponding to section  1   c  of the envelope-filling table  1  to an advancing area corresponding to section  1   d  of the envelope-filling table  1 . 
   Of course, instead of the conveying belts of the envelope-feeding arrangement  9  shown in the drawing and of the intermediate envelope-conveying arrangement  13 , perforated rotating belts routed across vacuum chambers can also be used, so that by correspondingly setting the vacuum along the direction in which the belt runs, the effective coupling force between the bottom of the envelope and the vacuum conveying belts can be adjusted in such a way that the mobility of the envelope mentioned above is provided at the end of the conveying run of the envelope-feeding arrangement  9  and at the end of the conveying run of the intermediate envelope-conveying arrangement  13  in order to permit the respective translatory movements as indicated by arrow P 2  and as indicated by arrow P 3 . 
   Furthermore, a person skilled in the art will understand that the envelope-filling station that is merely indicated schematically in the drawing can be configured in such a way with regard to the location of the support means and the position of the stopping straightedge  24  can be designed in such a way that different envelope sizes can be processed. In addition, the support device  24  can be pivoted down or up in order to make the top of the envelope-filling table  1  accessible in the event of malfunctions. The same applies to the roller bar  36  and the sets of rollers  43 .