Abstract:
A franking machine has an ink jet printing device with exchangeable ink cartridges. The lower housing shell of a security housing of the franking machine has a sealable, shaft-shaped opening in the base and is designed to accommodate assemblies that can be contaminated with ink. These assemblies are situated in a non-secure region of the franking machine and are accessible via the aforementioned opening when a cover of the shaft-shaped opening is opened. A servicing procedure allows the franking machine to be retrofitted to print with a different ink color. After moving the print carriage in one direction and opening a cartridge flap, the ink cartridges can be removed. A displacement of the print carriage takes place after closing the cartridge flap, wherein the print carriage is moved in the opposite direction so that the print carriage arrives in the sealing position for ink cartridges. A box-shaped mod can now be removed from the franking machine. Servicing of the ink-contaminated modules subsequently takes place via the aforementioned opening.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention concerns a franking machine of the type having a printing device to print on a flat item (for example a mail piece or a franking tape) with a predetermined franking color. Such franking machine is used in connection with peripheral and other mail processing apparatuses in a franking system that is purchased, or rented wholly or in part, by a customer. The invention also concerns a method for servicing such a franking machine. 
     2. Description of the Prior Art 
     The color of the imprint produced by a franking machine is predetermined in a nation-specific manner by respective national postal authorities. Franking machines of various types are known in which a modification is made only if a mail piece is to be sent from one country to another country in which a different color of imprint is mandated. For example, when franking machines have been leased in the one country and are replaced by other franking machines in that country, the franking machines that are no longer leased can be retrofitted, shipped to another country and offered for sale there. In the case of currently available franking systems from Francotyp Postalia GmbH and other companies, a retrofitting of the franking color is possible only after opening the security housing. The parts and/or assemblies contaminated with ink can be cleaned or exchanged after opening the security housing. 
     High retrofitting and servicing costs are especially disadvantageous in a lease transaction. Moreover, there is no simple servicing of the franking machines. 
     It has been proposed to allow an operator to implement an exchange of an assembly at an apparatus without having to arrange for, and be charged by, a service technician for this task. For this purpose, a locking device for a tray into which a pluggable assembly is inserted is known from German Utility Patent DE 202010015352 U1. The tray is accessible only when the apparatus is unpowered. A power-free contacting of the assembly is then possible. By contrast, an additional access to a low power connector is only accessible when the first cited access is locked. The operator can advantageously implement an exchange of an assembly after the power cable has been pulled out of the low power connector. 
     A device to lower, position, and raise contact pressure elements of a printer apparatus is known from the German Utility Patent DE 202010015351 U1. A box-shaped module is described therein that is equipped with a feed table that has at its top side an opening for the contact pressure elements of a contact pressure device, and the contact pressure elements are arranged to be removable to facilitate their servicing. In an operating position, the box-shaped module is arranged below the printing device of the franking machine and can be removed from this position for the purpose of servicing. A mechanical connection element and an ink reservoir are arranged at the back side of the box-shaped module. As soon as an internal lock is released, the box-shaped unit slides forward like a drawer on two guide rails and can be completely removed. After concluding the servicing, it can be brought completely back into the operating position by means of the two guide rails and be used further. For example, the box-shaped module can be removed to correct a jam. However, after a jam it has been shown in practice that the servicing of the contact pressure elements of the box-shaped module and a cleaning of light sensors of the photoelectric barriers of the franking machine takes place much more often than a servicing of the ink reservoir. Moreover, the ink reservoir is contaminated by an ink cloud that permeates the franking machine through all openings that are not completely sealed during the operation of the printing device. Naturally, a cleaning of the surface of the lower housing part of the franking machine that is contaminated by an ink cloud is time-consuming. Such a franking machine thus cannot be resold in another country without further measures. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to remedy the disadvantages of the known devices. A structural design of the ink-contaminated assemblies and their arrangement in the franking machine should allow access to these assemblies and their exchange without opening the security housing. The servicing of the franking machines should additionally be simplified. 
     Assuming that a security housing encloses the ink printing device and its control unit, and that an opening of the security housing is necessary exclusively when an access to security-relevant modules should be enabled, a secure region is differentiated from a plurality of non-secure regions: all assemblies that can be contaminated with ink are arranged in the non-secure regions of the franking machine. One of the non-secure regions of the franking machine is that region in which the box-shaped module known from DE 202010015351 U1 is brought into the operating position. The front side of the lower housing shell of the franking machine is set back relative to the front side of the upper housing shell and the front side of the lower housing shell whose bases are designed accordingly, such that all assemblies that can be contaminated with ink are not situated in non-secure regions. The box-shaped module is a first unit that can be removed and exchanged. However, no ink reservoir has now been molded on the back side of the box-shaped module. According to the invention, an ink capture container corresponding to the ink reservoir is modularly arranged within the franking machine at a position situated between the cleaning and sealing station and the base plate of the lower housing part. This position is accessible via a shaft-shaped opening in the base of the lower housing shell of the franking machine. The shaft-shaped opening has at least one guide rail and facilitates the installation of the ink capture container. At least one service module is associated with an inkjet print head. The latter can be an integrated component of an ink cartridge. A cleaning and sealing station is formed by two removable and exchangeable service modules, with an inkjet print head of the print carriage being associated with each of the service modules. The shaft opening is designed so that it can be sealed by a cover. Ink particles of the ink cloud become deposited within the ink capture container of the franking machine. The ink capture container is pressed against the two service modules when the cover of the shaft-shaped opening is closed. An unwanted contamination of one of the visible surfaces of the franking machine is therefore avoided. 
     Opening of the cover in the base of the lower housing shell thus enables an access to an additional non-secure region and an exchange of assemblies without opening the security housing. Access to exchange an ink receptacle is possible after the ink capture container has been removed first, and then the two service modules of the cleaning and sealing station, with the ink receptacle arranged at the print carriage. For a servicing, for example a retrofitting of the franking color, a removal of the ink cartridge and a closing of the cartridge flap initially take place in the operating mode. The franking machine is subsequently deactivated and the connection to mains power is interrupted by removing the plug connector of the power cable from the low power connection, and access to the latter is sealed by a slider. By turning a tool, for example a screwdriver, preferably a multifunction stylus equipped with a screwdriver bit, rotation of the shaft inside the franking machine can be produced even without an electric actuator, such that the print carriage moves until it arrives at the sealing position for ink cartridges in which a removal of the box-shaped module is enabled. Implementation of servicing of ink-contaminated assemblies that are arranged in the box-shaped module, and those that are arranged in the base of the lower housing shell of the franking machine, subsequently takes place. 
     When the franking machine is not connected to mains power, manual displacement of the print carriage can move it into a position in which the cartridge flap opens. For this purpose, the franking machine is equipped with a hole in the security housing into which the multifunction stylus is introduced and turned. The ink cartridges can thus be exchanged at arbitrary points in time, even when no removal of the ink cartridges by the customer has previously taken place. The cartridge flap is subsequently closed again. 
     The print carriage is mounted so as to be mechanically movable within the franking machine on a slide rail to direct the print carriage along a designed path. The print carriage can likewise be moved in the opposite direction by an adjustment by means of the multifunction stylus, such that the print carriage arrives in the sealing position for ink cartridges. This allows the removal of the box-shaped module from the franking machine for the purpose of cleaning the sensors and transport elements of the franking machine as well as for the exchange of the contact pressure elements that are arranged in the box-shaped module so as to be exchangeable. In the event of a more serious contamination, the entire box-shaped module can be exchanged. After removal of the box-shaped module, the franking machine can be rotated so that the base of the lower housing shell faces upwardly. The cover can now be uninstalled from the base of the lower housing shell in order to enable access via the shaft-shaped opening to the additional non-secure region of the franking machine. After removing the ink capture container, the service modules, and an ink receptacle that includes a wiping lip cleaning sponge, all assemblies that are required to retrofit the franking color can be reinstalled in the reverse order. The print carriage has an ink receptacle cavity so that a new, clean ink receptacle can be installed in the ink receptacle cavity. The service modules and the ink capture container are subsequently renewed. The franking machine can be activated again after sealing the shaft-shaped opening with the cover and establishing a power connection. The print carriage can be moved with the electric actuator. This enables the cartridge flap to be opened. The ink cartridges with the new franking color are now to be used in the franking machine, and the retrofitting of the franking machine is ended. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a franking machine in accordance with the invention, as seen from the upper rear right, with the mains power connection blocked by a slider and with a stylus inserted therein, that is also separately shown, with a portion thereof separately shown enlarged in Detail A. 
         FIG. 2  is a perspective view of the franking machine from the upper front right, with a box-shaped module and an open cartridge flap. 
         FIG. 3  is a perspective view of the franking machine from the upper front right, with a box-shaped module pulled forward. 
         FIG. 4  is a perspective view of the franking machine from the upper front right, with multiple module-shaped modules shown pulled downward. 
         FIG. 5  is a perspective view of the franking machine from below, with a shaft-shaped opening and with an uninstalled cover, and with an installed ink capture container separately shown in Detail B. 
         FIG. 6  is a perspective view of the shaft-shaped opening with two service modules in the same environment as Detail B. 
         FIG. 7  is a perspective view of the uninstalled ink capture container. 
         FIG. 8  is a perspective view of the shaft-shaped opening with an ink receptacle installed at the print carriage, in the same environment as Detail B. 
         FIG. 9  is a perspective view of the two uninstalled service modules. 
         FIG. 10  is a perspective view of the shaft-shaped opening, without the ink receptacle, in the same environment as Detail B. 
         FIG. 11  is a perspective view of the ink receptacle. 
         FIG. 12  is a perspective view of the print carriage at a frame side wall front the rear upper right, as well as the ink capture container and the arrangement of the service modules, as well as Details C and D of the mechanical connection of the latter with the frame base plate. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       FIG. 1  is a perspective view of a franking machine from the rear upper right, with the mains power connector blocked by a slider.  FIG. 1  also includes Detail A. The assemblies of the franking machine  1  are surrounded by an upper housing shell  2  and a lower housing shell  5  that, together with a plate  3  at the upper housing shell  2 , form a security housing. A box-shaped module  6  can be removed from the franking machine  1 . The back side of the franking machine  1  has a depression  4  up to a metal plate, with sockets for the electrical connections. Access to one of the electrical connections results in a low power connection. The aforementioned access can be sealed by a slider  7  when the latter is shifted in the arrow direction. A slider handle  7 . 1  is molded on the slider  7  for operation thereof. The aforementioned depression  4  is partially molded into the upper housing shell  2  and into the lower housing shell  5 . The edge of the plate  3  meets the edge of the lower housing shell  5  at the back side of the franking machine. In the middle of the housing, a hole is formed by one semicircle-shaped opening  3 . 0  at the edge of the upper housing shell  2  and another semicircle-shaped opening  5 . 0  at the edge of the lower housing shell  5 . The hole is provided for insertion of a multifunction stylus  8 . 1 , which then serves as a rotation tool. A display  8  is provided at the top side of the franking machine  1 . The latter has a mount  8 . 0  for the multifunction stylus  8 . 1 . The multifunction stylus  8 . 1  can be removed from the franking machine  1  due to a projection  8 . 13  at the one end of the stylus  8 . 1  so that the stylus  8 . 1  can then be used to make inputs via a touchscreen of the display. The stylus  8 . 1  is used to displace components in the franking machine  1  by rotation of multifunction stylus  8 . 1  after being introduced into the hole. The stylus tip  8 . 12  of the multifunction stylus  8 . 1  is shaped in order to make the aforementioned touchscreen inputs, as shown in Detail A. A tool in the form of a socket key is shaped between the shaft of the stylus  8 . 1  and the tip  8 . 12  of the stylus. In the shown example, the tool has a cylindrical shank with a flat area. 
     Alternatively, a hex head or another shape can be used. 
     A perspective view of the franking machine from the upper front right according to  FIG. 2  shows an open cartridge flap  9  at a surface of the plate  3  that is angled forward. The open cartridge flap  9  uncovers an access to a shaft  10  order to be able to exchange ink cartridges  11 ,  12 . The cartridge flap  9  approximately occupies the left half of the top side of the franking machine, while the display  8  is arranged in a plate  19  which occupies the other half of the top side of the franking machine and is installed on the upper housing shell  2 . A box-shaped module  6  is positioned at the front of the franking machine, below the upper housing shell  2 , and forms a drawer-like, modular part that can be removed at the front. 
       FIG. 3  is a perspective view of the franking machine  1  from the top upper right, with a box-shaped module  6  removed at the front. The angled-forward surface of the plate  3  transitions into a closed cartridge flap  9  that extends to an upper forward edge of the upper housing shell  2  of the franking machine  1 . 
       FIG. 4  is a perspective view of the franking machine  1  from the upper right front, with multiple module-like structural units  15 ,  16 . 1 ,  16 . 2  and  17  shown removed at the rear, which modules are arranged under a cover  5 . 5  inside the franking machine  1 . The cover  5 . 5  has a screw opening  5 . 51  and can be attached to the base of the franking machine  1  by means of a screw  5 . 7  so as to be detachable. The removed box-shaped module is not shown, for better clarity. 
       FIG. 5  is a perspective view of the franking machine  1  from below, so that a shaft-shaped opening  5 . 2  and with an uninstalled cover  5 . 5  can be seen, as well as an installed ink capture container  15 , the arrangement of which is explained in detail using Detail B. At the base  5 . 1  of the lower housing shell  5  is a shaft-shaped opening  5 . 2 , via which a number of module-shaped structural units can be uninstalled and installed when the screw  5 . 7  is loosened by being unscrewed from a bolt hole  5 . 31  in a bearing surface  5 . 4 , and the cover  5 . 5  has been removed. The cover  5 . 5  has two installation projections  5 . 52 ,  5 . 53  that are arranged on the edge of the cover opposite the bolt opening  5 . 31 . The shaft-shaped opening  5 . 2  is equipped with two suitably shaped, slot-shaped openings  5 . 3  on the side, into which the installation projections are plugged upon installation of the cover  5 . 5 . The bearing surface  5 . 4  lies in a recess of the base  5 . 1  opposite the side with the slot-shaped openings  5 . 3  and transitions into a ledge in the shaft-shaped opening  5 . 2 . The shaft-shaped opening  5 . 2  extends to a frame base plate  45  which has a narrower opening with a predefined contour in the region of the shaft-shaped opening  5 . 2 . The shaft edge near the bearing surface has been depicted in section in Detail B in order to make a guide rail  5 . 21  at the shaft edge visible, in which guide rail  5 . 21  a guide groove  15 . 21  engages which has been shaped at an edge  15 . 2  of the installed ink capture container  15 . A rubber-like, elastically deformable disc  15 . 1  is attached to the ink capture container  15 , near the guide groove. Given an installed cover  5 . 5 , an inserted ink capture container  15  is exposed by the disc  15 . 1  to a contact pressure which presses the ink capture container  15  against the underlying free-spraying shafts of the service modules. The contour of the opening in the frame base plate  45  is adapted to the shape of the service modules, which are subsequently explained using  FIG. 6 . 
       FIG. 6  is a perspective view of the shaft-shaped opening  5 . 2  with two service modules  16 . 1  and  16 . 2  that are installed offset from one another at a contour of the frame base plate  45 . Both service modules  16 . 1  and  16 . 2  have the same box-like shape. With attachment means, they are respectively equipped at the ends with a frame and with a free-spraying shaft, the last two being arranged in succession. At least one installation projection  16 . 11 ,  16 . 21  as an attachment means is arranged at the one end of the series arrangement, and a respective, resiliently elastic detent lever  16 . 12 ,  16 . 22  as an attachment means is arranged at the other end of the series arrangement. The series arrangement respectively has a free-spraying shaft  16 . 10 ,  16 . 20  with a quadratic cross section area which transitions into a shaped part at which the at least one installation projection  16 . 11 ,  16 . 21  is molded. At the opposite side, the series arrangement respectively has a frame with a rectangular cross section area which is oblong in shape and at which is molded a resilient elastic detent lever. A guide rail  5 . 21  is shown in section at a shaft wall of the shaft-shaped opening in the base of the lower housing shell. An additional guide rail  5 . 22  that is arranged at the shaft wall, near a frame side wall  44 , exists opposite this guide rail  5 . 21 . The frame side wall  44  and the frame base plate  45  are firmly connected with one another. The guide rails  5 . 21 ,  5 . 22  cooperate with the guide grooves  15 . 21 ,  15 . 22  arranged at the edge  15 . 2  of the ink capture container  15  upon installation. 
     The guide grooves arise from the perspective presentation of the uninstalled ink capture container  15  that is shown in  FIG. 7 . Molded opposite the disc  15 . 1 , at a corner of the edge  15 . 2 , is a funnel  15 . 23  near the guide groove  15 . 21 , wherein the edge of the funnel is arranged parallel to the disc surface and—upon installation—rests on the edge of the free-spraying shaft  16 . 20  so as to seal it, and conducts the free-spraying ink into the ink capture container  15 . 
     Using the perspective presentation of the shaft-shaped opening shown in  FIG. 8 , with an ink receptacle  17  installed at the print carriage  14 , which contains an ink jet module and controls therefor. The contour of the opening in the frame base plate  45  is also visible since the service modules (RDS modules) have been uninstalled. The contour is adapted to the shape of the service modules. The offset in the contour corresponds to the offset of the position of the ink cartridges in the print carriage  14 . A slide rail  18  to guide the print carriage extends parallel to the frame side wall  44  and is attached to a rear frame wall  46 . The ink receptacle is designed so as to be installable in order to be installed in an ink receptacle cavity which is incorporated into the print carriage, which arises from  FIG. 10 . The print carriage is arranged in the franking machine so as to be mechanically movable on the slide rail  18 , which arises from  FIGS. 8 ,  10  and  12 . The ink receptacle  17  is exchangeable when the print carriage  14  arrives in a non-secure region, which is accessible via the shaft-shaped opening. 
     A perspective view of the two uninstalled service modules is shown in  FIG. 9 . Each of the service modules  16 . 1  and  16 . 2  has at the respective end a shaped part with an installation projection  16 . 11 ,  16 . 21  that extends in the direction of the edge of the contour. Wiping lips  16 . 13 ,  16 . 23  are attached at each shaped part, each wiping lip  16 . 13 ,  16 . 23  extending in the direction of the print carriage when the service module is installed at the frame base plate  45 . At the opposite end of each service module  16 . 1 ,  16 . 2  is a respective molded resilient elastic detent lever  16 . 12 ,  16 . 22 . Each detent lever  16 . 12 ,  16 . 22  extends opposite the direction (thus away from the print carriage) when the service module is installed at the frame base plate  45 . Each service module  16 . 1  and  16 . 2  has a respective free-spraying shaft  16 . 10 ,  16 . 20  therein. 
       FIG. 10  is a perspective view of the shaft-shaped opening with the print carriage  14  without an ink receptacle, but with an ink receptacle cavity  14 . 1 . 
     The perspective view of the ink receptacle  17  is shown in  FIG. 11 . For example, the ink receptacle has a sponge  17 . 1  and a sponge mount  17 . 2  that can be inserted into the ink receptacle cavity  14 . 1 . The sponge mount  17 . 2  is equipped with a snap-in connection. 
     A perspective view of a print carriage  14  at a side frame wall  44  is shown from the rear upper right in  FIG. 12 . An ink capture container  15  and an arrangement of the service modules, as well as details C and D of the mechanism connection with the frame base plate  45 , are likewise shown. The wiping lips  16 . 13 ,  16 . 23  extend in the direction of the print carriage  14 , which is directed on a slide rail  18 . The respective free-spraying shafts  16 . 10 ,  16 . 20  are arranged near the wiping lips  16 . 13 ,  16 . 23 . The mechanism connection of the installation projection  16 . 11  with the frame base plate  45  for the service module  16 . 1  is shown enlarged in Detail C. Detail D shows the function of the resilient elastic detent lever  16 . 12 ,  16 . 22  of the service modules  16 . 1  and  16 . 2  after their engagement in the contour of the frame base plate  45 , which is angled away from the side frame wall  44 . 
     Although modifications and changes may be suggested by those skilled in the art, it is the intention of the inventor to embody within the patent warranted hereon all changes and modifications as reasonably and properly come within the scope of his contribution to the art.