Abstract:
A housing assembly for non-mechanical printers consisting of a base frame having a second housing cover slidably mounted thereon through telescoping slides and a first housing cover slidably carried by the second housing cover through telescoping slides, the first housing cover being slidable over the second housing cover, the second housing cover and first housing cover being slidable beyond the base frame.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a housing cover assembly for non-mechanical printers of the type where individual areas of the printer must be freely accessible for purposes of operation and servicing. 
     2. Prior Art 
     In relatively large mechanical devices, such as non-mechanical printers, it is necessary for individual internal sub-areas of the device to be freely accessible. For example, in such printers paper stacks must be frequently exchanged. For this purpose that area of the housing of the printer in which the stacks are positioned must be readily accessible without difficulties. On the other hand, other internal of the device must also be readily accessible for servicing and checking of the printer mechanism. These other areas include, for example, the print mechanism which must be serviced and electrical assemblies which must be checked. 
     SUMMARY OF THE INVENTION 
     The principal object of this invention is to provide a housing for devices of this kind, which is arranged such that the necessary device areas are freely accessible by movement of as few cover components as possible. Any cover portion is opened operation is to not obstruct the operator or service technician. 
     This object is realized by providing a first cover which covers a part of a longitudinal side, for example a front side, and the top side of the device and which is designed to be movable. A second cover is provided which covers an additional part of the same longitudinal side and of the top surface or side of the device. The first cover can be moved onto the second cover, and the first cover and the second cover can be moved together beyond a basic frame which encloses the mechanism. 
     By displacing the first cover it is possible to expose that part of the device to which access must be most frequently obtained. For this purpose it is advantageous to use guide tracks attached to the second cover, on which the first cover can be moved. 
     If further areas of the device are to be exposed, it is advantageous to be able to displace the second cover along with the first cover. For this purpose an additional set of guide tracks can be provided on the base frame on which the second cover can be moved. 
     It is extremely advantageous to use telescoping track assemblies as the guide tracks. 
     A first area part can best be exposed without difficulties if the first cover is formed as a sliding door. Guidance of such a sliding door can be by means of two telescoping track assemblies affixed to second cover. In the illustrated embodiment, one telescoping track assembly is attached adjacent to a free edge of the top part of the sliding door, and the other track assembly attached adjacent to the free bottom edge of the front of the sliding door. Consequently both free edges of the sliding door move on telescopic track assemblies. 
     In order to avoid damage to the second cover, it is advantageous to provide the front part of the sliding door or first cover with rollers by means of which the sliding door can contact the second cover without damage. In order to prevent the first cover from undesirably moving past the second cover, a stop means, which may comprise a rubber bumper, is provided at the end of the second cover. When moved, the first cover will abut against the stop means. 
     However, it is advantageous to provide fro movement of the first cover beyond the second cover, for example in order to clean the glass plates of the sliding door. For this purpose the telescoping tracks positioned on the second cover are of the type which can be both sides. When the stop means on the second extended cover is removed, the first cover can them be moved past the second cover. 
     In order to prevent the second cover from being displaced when the sliding door is moved onto it, the basic frame may be provided with a lock device locking the second cover to the base frame. Expediently, the second cover comprises an openable service door which in its closed state lies adjacent to the front and top sides of the device and which further includes a frame portion connected to the service door. 
     In order to make the second cover displaceable on the base frame, three telescoping track assemblies are secured to the basic frame. The first telescoping track assembly is positioned to the free or back edge to part of the service door, the second track assembly is positioned adjacent to the free edge of the front part of the door, and the third track assembly is positioned adjacent the middle part of the front side of the service door. Thus the second cover is supported at three points by telescoping tracks. As the second cover can be displaced, together with the first cover, beyond the base frame, the service door and the frame of the second cover are provided with rollers for resting on the base when the first and second covers are removed from the device. As it is also possible to remove only the sliding door or first cover from the device, the sliding door is also provided with rollers. 
     Other objects, features and advantages of the invention will be readily apparent from the following description of preferred embodiments thereof, taken in conjunction with the accompanying drawings, although variations and modifications may be effected without departing from the spirit and scope of the novel concepts of the disclosure, and in which: 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of the housing of the the device, in a closed position. 
     FIG. 2 is a perspective view of the housing with the first cover open. 
     FIG. 3 is a perspective view of the housing when both covers are removed from the device. 
     FIG. 4 is an end view with portions removed of the housing in the direction E of FIG. 1. 
     FIG. 5 is a sectional view of the housing along line AB of FIG. 1. 
     FIG. 6 is a sectional view of the housing along line CD of FIG. 1. 
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
     FIG. 1 shows a non-mechanical printer with a housing according to this invention. The housing GH is shown in the closed state. The housing GH consists of a first cover VK 1 , is formed as a sliding door and is privided with two glass plates GL. In the closed state, the sliding door extends over a part of the longitudinal or front side of the device and over upper part or top side of the device. The second cover VK 2  includes a service door WT which in the closed state extends over another part of the device and in fact over a part of the longitudinal side and the upper side. Furthermore the second cover VK 2  includes a side wall component ST 1 . The housing GH is completed by a further cover VK 3  which serves to cover the remainder of the device on the front side and the top side. 
     FIG. 2 illustrates the housing when the sliding door VK 1  has been moved onto the cover VK 2 . As a result, a part of the interior of device is exposed. In a printer for example this can be that region of the printer GER device in which the stacks of paper are positioned. 
     Those parts of the housing GH illustrated in FIG. 1 are again shown. However, the sliding door VK 1  has now been moved onto the cover VK 2 . As a result a part of a basic frame KR is exposed. The printing assembly GER is secured to this base frame KR. The rear walls RT 2 , RT 3  which can be openable doors are also shown. 
     If the assembly GER is to be further exposed, the sliding door VK 1  together with the second cover VK 2  can be removed from the basic frame KR. This is illustrated in FIG. 3. Here a further back wall RT 1  is exposed which can also be a door. 
     Thus as shown in FIGS. 1-3, parts of the interior device GER can be exposed without difficulties simply by moving parts of the cover with respect to the device GER and the base frame KR. The other parts of the device GER can be exposed by designing the rear walls RT 1  to RT 3  and the side walls ST 2  and ST 1  as doors which can be opened. 
     FIG. 4 is an end view in the direction E (FIG. 1) with the side door ST 1  removed. The sliding door or first cover VK 1  is again shown. Beneath this the second cover VK 2  consisting of a service door WT and a frame RA is shown. A part of the service door WT, e.g. the operator door OT, can be pivoted to the frame RA. Only a part of the base frame KR has been shown. 
     The sliding door of first cover VK 1  which covers a part of the longitudinal or front side and of the upper or top side of the device, moves on telescoping track assemblies TS of a type known in the art. One of these telescoping tracks TS 1  is illustrated in FIG. 4. It is positioned between the frame RA of the cover VK 2  and the free edge of the top side of the sliding door VK 1 . This top side is referenced OS 1 . The second telescoping track assembly for guidance of the sliding door VK 1  is not visible in FIG. 4. It lies behind a stop means AS. 
     Stop means AS is provided to stop the sliding door VK 1  when the sliding door VK 1  is moved onto the second cover VK 2 . The stop means AS may be provided with rubber bumpers GP against which the sliding door VK 1  abuts. The stop means AS is designed to be removable in order to allow the sliding door VK 1  to be moved past the second cover VK 2 , for example, when cleaning the glass GL. In order to allow the sliding door VK 1  to rest against the base, it is provided with rollers RL 1  on its front part VT 1 . One of these rollers is visible in FIG. 4, and the other is arranged at the other end of the front part VT 1  of the sliding door VK 1 . 
     The second cover VK 2  with its service door WT and frame RA is positioned below the first cover KI. The second cover VK 2  moves on three guide tracks, which are likewise telescoping track assemblies, two of which are illustrated in FIG. 4. These track assemblies TS 3  and TS 6  are secured to the basic frame KR. This provides a guidance for the top of the cover VK 2 . THe second track TS 4  for the second cover VK 2  lies between the free edge of the front part VT 2  of the cover VK 2  and the basic frame KR. This provides guidance for the front longitudinal side of the second cover VK 2 . The position of the third telescoping track TS 5  is shown in FIG. 6. 
     The second cover VK 2  is provided with rollers RL 2  with the aid of which the second cover can rest on the base when the first cover VK 1 , together with the second cover VK 2 , has been removed from the device to the side thereof. A second roller RL 2  is in each case arranged at the other end of the cover VK 2 . 
     FIG. 5 illustrates a view taken along line A-B of FIG. 1. Here only the front portion of the housing GH is shown in the cross section as only this part is necessary to explain the functions of the housing. A locking device RI secured to the base frame KR serves to lock the second cover VK 2 . The second cover VK 2  is illustrated in panthom. The front side of the cover VK 2  can, for example, include a rotatable door OT which can be rotated about hinge SCH. In the area of the second cover VK 2  is shown the telescoping track TS 2  which is secured to the second cover VK 2  and upon which the sliding door VK 1  moves. In addition to this track TS 1  there is shown a further telescoping track assembly TS 5  which is attached to the base frame KR and upon which the second cover VK 2  moves. 
     FIG. 5 also shows the sliding door VK 1 , in its closed state. Here the cover VK 1  rests against a seal DI which is attached to the cover VK 3 . A portion of glass plate GL can also be seen. The sliding door VK 1  is provided with support rollers STU by means of which it can rest against the cover VK 2  when the sliding door is moved onto the second cover VK 2 . Parts of the side doors ST 1  and ST 2  are also shown. 
     Finally FIG. 6 is taken along line C-D of FIG. 1. Again only the front portion of the housing has been shown. 
     The sliding door VK 1  is postitioned over the second cover VK 2 . Here telescoping track TS 2  has been shown upon which the sliding door VK 1  moves and which is attached to the second cover VK 2 . Also shown is the roller RL 2  upon which the sliding door VK 1  can rest when it is moved beyond the second cover VK 2 . In the central region of the sliding door VK 1  support roller STU are positioned which move along a groove BL on the second cover VK 2  and which prevent the second cover VK 2  from being damaged by the sliding door. 
     The second cover VK 2 , and its service door WT, are positioned adjacent the sliding door VK 1 . It can be seen that the third telescoping track TS 5  lies in the central region of the longitudinal side of the cover. This telescopic track is secured, on one hand, to the base frame KR and on the other hand to the service door WT. The track assembly TS 4  is positioned at the lower end of the front part of the cover VK 2  and, on one hand, is secured to the basic frame KR and on the other hand to the second cover VK 2 . 
     The function of the housing will be briefly described in the following. In the closed state, the sliding door VK 1  lies adjacent to the cover VK 3 , as shown in FIG. 1, and the entire device GER is covered by the cover VK. 
     If a first part of the device is to be rendered accessible, the sliding door VK 1  is moved onto the cover VK 2 , running on the telescoping tracks TS 1  and TS 2 . This exposes that part of the device GR to which access is most frequently required. During this sliding process, the sliding door VK 1  abuts against the stop means AS. Damage to the second cover VK 2  by the sliding door VK 1  is prevented by the support rollers STU which can be formed, for example, of synthetic material. 
     If a further part of the device is to be rendered accessible, the locking device RI is released. Now the second cover VK 2  together with the first cover VK 1  can be moved away from the basic frame KR and thus from the device GER. The second cover VK 2  moves on the telescoping tracks TS 3  to TS 5 . The roller RL 1  provide support on the base. Thus the major part of the device GER has been exposed simply by displacing two cover components. 
     If, however, only the sliding door VK 1  is to be removed from the device GER and in fact beyond the second cover VK 2 , the second cover VK 2  remains locked by the locking device RI. As the telescoping tracks TS 1  and TS 2  can be extended in two directions, i.e. in the direction of the cover VK 3  and in the opposite direction, the sliding door VK 1  can be displaced beyond the cover VK 2 . In this case the sliding door VK 1  rests by means of the rollers RL 2  on the base. 
     The cover VK 1  can only be displaced in this way beyond the cover VK 2  when the stop means AS has been removed. 
     Closure of the device by the cover VK is carried out in opposite sequence. First the two covers VK 1  and VK 2  are moved onto the device until the second cover VK 2  engages with the locking device RI. Then the sliding door VK 1  can be moved forwards until it abuts against the sear DI. Thus the housing around the device GER is closed. 
     Although the teachings of my invention have herein been discussed with reference to specific theories and embodiments, it is to be understood that these are by way of illustration only and that others may wish to utilize my invention in different designs or applications.