Patent Publication Number: US-2009232457-A1

Title: Splicer with Splicing Cassette Carrier

Description:
FIELD OF THE INVENTION 
     The invention relates to a splicer with a splicing cassette carrier for holding a splicing cassette while optical waveguides or optical fibers are being spliced in the splicer. The invention also relates to mobile or portable lightweight splicers, which can be transported and used by one operator, in order to splice optical fibers inside or outside closed buildings. 
     TECHNICAL BACKGROUND 
     Splicers are used in a wide technical field, although they are particularly suitable for splicing optical waveguides and optical fibers. Mobile splicers are particularly suitable for use in the field, and are used when, for example, optical fibers are spliced on a mast or for an underground cable. A mobile splicer such as this typically comprises a splicing unit, a control and display unit, a shrinking unit and a chassis which accommodates these units. The splicer generally has an associated splicing cassette carrier, which is used to accommodate the splicing cassettes required for splicing. The fibers which have previously been spliced in the splicing unit are inserted into the splicing cassette in order to keep them clearly arranged during the time in which further fibers are being spliced. The splicing cassette normally comprises a plastic housing which can be opened, and holding apparatuses, incorporated therein, for the spliced fibers. 
     One example of a splicing unit is shown in  FIG. 7 . Two fiber strips which are to be joined together and have optical fibers  18  are each fixed shortly before their ends in fiber holders  16  and are positioned on movement units (X, Y and Z direction), which are not shown, in order to be spliced. The ends of the optical fibers  18  can be aligned with the aid of grooves into which the fibers are introduced. Assuming that the fibers are optimally positioned in the individual grooves, then the movement units then just need to be aligned. In an improved embodiment, detectors and light sources can also be used in order to adjust the fiber ends with respect to one another. 
     Once the two ends of the respective fibers  18  have been moved to a position close to one another, then a voltage is applied between the electrodes  14 , which are held by electrode holders  12 , and leads to a hot arc being formed. The respective fiber ends melt under the deliberate influence of heat. 
     The user of a splicer carries out a predetermined sequence of activities for splicing of optical fibers. The splicer is placed on a flat stable surface or base in order to carry out the splicing process. First of all, the sheaths on the exposed cable ends of the cable are removed, followed by removing the fiber coatings on the individual fibers which are contained in the cable. The unprotected ends of the individual fibers are inserted in the fiber holder  16 . A splicing cassette  36  is also provided for the multiplicity of spliced individual fibers. A splicing cassette carrier on which the splicing cassette is positioned can optionally be provided for this purpose. A splicing cassette carrier such as this is in general either permanently fitted to the splicer, can be mounted on the splicer (screwed, hooked-in, etc.) or is simply placed alongside the splicer. 
     The two fiber holders  16  with the fixed ends of the optical fibers  18  are inserted into the splicing unit  10 . The splicing unit  10  is located, in a protected manner, within the chassis, behind an opening which is provided with a cover in order to protect the fine mechanism. Once the splicer has been positioned, the splicing cassette carrier has been provided and the fiber end with the fiber holders has been prepared, then the splicer is operated via a control and/or display apparatus. The splicing process is controlled via a control area. A display area provides status messages relating to the adjustment and the splicing process itself. Once the splicing process has been completed, the spliced fiber strips are removed from the splicing unit  10 , or the opening  30  in the chassis, and are passed to a shrinking unit. During this process, shrink sleeves are shrunk onto the spliced points of the fiber cable  18  under the influence of heat, in order to protect the cable. 
     The splicing cassette carrier is preferably located on the rear face of the splicer. This is because, the movement procedure can be carried out in this case, starting with the fibers being inserted into the splicing unit, through the shrinking process to the spliced fibers being placed in the splicing cassette in the direction of the rear face of the appliance. This is because, as seen by the operator, the splicing unit is aligned at the front on the splicer, while the shrinking unit is arranged behind it, and the splicing cassette carrier is located on the rear face of the appliance, as a result of which the fibers which have been placed down and spliced are no longer in the way of further splicing processes. 
     A splicer is subject to stringent requirements, particularly for use in the field, outside closed buildings. The development progress for the fine mechanism in the splicing unit has resulted, for example, in a requirement to ensure better protection against dirt and shaking. However, for ergonomic reasons, the appliance design must not become more cumbersome, and an increase in weight resulting from the additional protective measures should be avoided. 
     SUMMARY 
     This problem as well as further problems which are only indicated here are solved by a splicing cassette carrier for holding a splicing cassette while splicing optical waveguides in a splicer, comprising: a plate with a flat surface for holding the splicing cassette; at least one carrier arm which is connected to the plate and supports it; and an apparatus in which the at least one carrier arm can be attached to a chassis of the splicer, mounted such that it can rotate about an axis, such that the splicing cassette carrier can be pivoted about the axis. 
     The problems are also solved by a splicer comprising a chassis with at least one opening and an apparatus for rotatable mounting of the splicing cassette carrier described above, a splicing unit for splicing of optical waveguides, with the splicing unit being arranged in the opening of the chassis, a control and/or display apparatus for controlling the splicing, which control and/or display apparatus is arranged in the chassis, and the splicing cassette carrier, which is mounted rotatably on the chassis by means of the apparatus, such that it can assume a first rotation position, in which it is used as intended to hold a splicing cassette, and at least one second rotation position, in which it acts as a protective cover for the control and/or display apparatus. 
     One of the ideas on which the invention is based is to attach the splicing cassette carrier to the chassis such that it can be used not only for its specific purpose for holding a splicing cassette during splicing but such that it can additionally also act as a cover for the control and/or display apparatus before or after the splicing process. This purpose is achieved by the splicing cassette carrier being mounted on the chassis such that it can rotate. 
     In consequence, the splicing cassette carrier can be moved from a first position, in which it can hold a splicing cassette, to a further position in which it covers the control and/or display apparatus. The splicing cassette carrier therefore carries out a dual function, in which it is additionally also used to protect system components of the splicer. Consequently, relatively sensitive components can also be used in the area of the control and/or display apparatus, such as TFT displays or finer keyboard elements which could not be provided in this form without effective protection against mechanical damage, dust, dirt, and the influence of cold or moisture. Furthermore, the cover provides protection against function keys in the control area being pressed inadvertently. A splicing cassette carrier such as this therefore allows considerable improvements to the splicer. 
     In addition, the dual use of the splicing cassette carrier both as a holder for the splicing cassette and as a cover for the control and/or display apparatus allows a considerable amount of weight to be saved because an additional cover is not required. 
     The configuration of the rotatable mounting is freely variable. For example, the shaft can be formed on the chassis and the relevant bush on the splicing cassette carrier. However, an opposite arrangement is likewise feasible. The invention likewise includes other options for mounting, such as attachment via an elastomeric compound, a ball bearing, electromechanical components, etc. 
     One refinement of the splicing cassette carrier provides for stop pins, which for example are removable, to be provided in the flat surface of the plate which holds the cassette. Depressions, in which the removable pins can be inserted, can be provided in the plate (or on the carrier arm) in an appropriate form, depending on the standard width of the splicing cassette. 
     The splicing cassette can be fixed on the stop pins by lateral opposing pressure. According to one refinement, a clamp can be provided for this purpose and is drawn, for example by a spring or other tension elements, in a direction parallel to the surface of the accommodating plate. The clamp thus presses the splicing cassette against the stop elements, as a result of which the splicing cassette is held securely on the splicing cassette carrier. 
     A further refinement provides for the clamp to be provided at the edge of the plate accommodating the splicing cassette, in which case it additionally also carries out the function of a closing apparatus for the splicing cassette carrier when the latter is in a position in which it covers the control and/or display apparatus. By way of example, a cover such as this can be unlocked by tightening the clamp in order then to fold it over such that the function of this cover can then be changed to that of the splicing cassette carrier. 
     A further refinement provides for the carrier arms to be designed such that they project beyond the plate which accommodates the splicers. This makes it possible to provide a cutout in the carrier, in which the cover which covers the opening in the chassis to the splicing unit comes to rest. The plate then pivots beyond the splicing and shrinking unit, which is positioned centrally on the chassis, between a carrier position (on the splicing rear face) and the covering position for the control and/or display apparatus (on the front face of the splicer), with these positions being at a distance from one another. 
     One particularly advantageous refinement also provides for the splicing cassette carrier to be used not only for its covering function but also additionally as a holder or handle for the splicer itself. The splicing cassette carrier can pivot freely between positions which can be marked, for example, by striking surfaces. The striking surfaces define the positions of the splicing cassette holder and the covering function. A rotation position which defines the handle function is located at an angular position in the middle but within this pivoting range. 
     In this refinement, an inner edge of the accommodating plate for the splicing cassette may have shaped elements which, for example, are matched to the shape of fingers of a hand which clasps this edge. Shaped elements such as these are made from material which is resistant to being gripped and may also be elastic. 
     A more advanced refinement provides for the center of gravity of the splicer to be designed such that it is located vertically below the axis of the splicing cassette carrier when the splicer is mounted or positioned flat on a surface. In this case, when the splicer is lifted with the aid of the handle, that is to say with the aid of the splicing cassette carrier, it is not possible for the splicer to carry out a sudden rotary movement relative to the splicing cassette carrier, which is held fixed. 
     The splicer can therefore be lifted and placed down safely without this resulting in severe shaking. One embodiment provides for preferred latching-in positions to be created by projections or tabs in the area of the axis or on the carrier arms thus making the splicer even more robust while being carried, and/or suppressing rotary movements of the splicer. Latching-in means such as these can also be used for the rotation positions in which the carrier and/or covering function is carried out by the splicing cassette carrier. 
     In one preferred embodiment of the splicer, the splicer comprises a control unit for controlling a splicing process, which control unit is connected to the control and/or display apparatus and to the splicing unit. 
     In one development of the splicer, the splicer has a supply device for providing a supply current for operating circuit components of the splicer. The splicer can be operated in a first or a second operating mode, with a lower supply current being provided by the supply device in the first operating mode than in the second operating mode. The control unit is designed such that it operates the splicer in the first or second operating mode as a function of the rotation position of the splicing cassette carrier. 
     By way of example, the first operating mode corresponds to a standby mode. The control unit operates the splicer in the standby mode, in which the power consumption is reduced, when the splicing cassette carrier is closed. This makes it possible to lengthen the operational readiness of the splicer. 
     However, it is also possible to reduce the current consumption when the splicing cassette carrier is open. For this purpose, the display apparatus has background lighting, the light intensity of which is variable. By way of example, a brightness sensor is provided in the control apparatus and detects the environmental brightness of the splicer when the splicing cassette carrier is open. The control unit operates the display apparatus such that the light intensity of the background lighting is set as a function of the environmental brightness detected by the brightness sensor. The power consumption of the display apparatus when the splicing cassette carrier is open can therefore be reduced in a bright environment. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
       The invention will now be explained in more detail with reference to figures, which show exemplary embodiments of the present invention, and in which: 
         FIG. 1  shows an illustration of the splicing cassette carrier, removed from the splicer, and an enlarged illustration of one of the carrier arms; 
         FIG. 2  shows a perspective view of a splicer according to one exemplary embodiment, with a splicing cassette carrier used as a cover; 
         FIG. 3  shows a perspective view of a splicer according to one exemplary embodiment, with a folded-up splicing cassette carrier used as a handle; 
         FIG. 4  shows a side view of the splicer shown in  FIG. 3 , in the form of a schematic illustration; 
         FIG. 5  shows a side view of the splicer according to one exemplary embodiment, in the form of a schematic illustration, with a folded-back splicing cassette carrier used as a cassette holder; 
         FIG. 6  shows an illustration of a splicer with an open covering apparatus; 
         FIG. 7  shows a schematic illustration of a splicing unit according to the prior art. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  shows a perspective illustration of a splicing cassette carrier  24  according to one exemplary embodiment of the invention. The splicing cassette carrier  24  can be seen in its entirety in the upper half of the figure, while the lower half of  FIG. 1  shows an enlarged detail of the carrier arm  48 . 
     The splicing cassette carrier  24  comprises a plate  56  which has a flat surface  46  and may be made, for example, from metal or from plastic. The plate  56  is used to accommodate a splicing cassette  36  (see  FIG. 5 ). The splicing cassette carrier  24  also has two carrier arms  48 , which lengthen the flat surface  46  of the plate  56  beyond its edge. The carrier arms  48  have two functions. On the one hand, they make the plate  56  robust by also continuing as elements  49  underneath the plate  56  thus ensuring that the metal plate is in a stable position at a given rotation angle and preventing torsion, while on the other hand they connect the metal plate to bushes  50  which are part of a shaft mounting for the splicing cassette carrier  24  on the chassis  22  of the splicer  20 . In this case, screws  52  are used to attach the splicing cassette carrier  24  to the chassis  22 , mounted such that it can rotate, and to form a rotation axis  54 , around which the splicing cassette carrier  24  can be rotated. The screws  52  allow the splicing cassette carrier  24  to be attached and detached easily. 
     Holes  44 ,  45  in which pins  40  can be inserted as stop elements for the splicing cassette  30  are provided in the plate  56  and on the carrier arms  48 . With respect to an opposing element, which is provided by the clamp  38 , the stop pins  40  make it possible to set three different widths for the splicing cassette  36 , on the basis of the hole positions  44 ,  45 . The clamp  38  is connected to a tension spring (not shown), which presses the clamp  38  against the fitted splicing cassette  36 , such that the cassette is clamped in between the stop pins  40  and the clamp  38 . 
     The plate  56  can be attached in any desired manner to the elements  49  and to the carrier arms  48 , for example by screw connection, adhesive bonding, etc. Alternatively, the plate  56  can also be formed from the same material as the carrier arms  48 ,  49 , and an integral embodiment is also feasible. 
     The element  49  may itself be in the form of a plate. As can be seen in  FIG. 2 , in order to prevent the hand from sliding off during pivoting, three structures like lines are structured on the surface of the element  49 . In this exemplary embodiment, the carrier arms  48  and the element  49  are formed integrally from a plastic. Because, in its covering function, the element  49  at the same time also represents a surface of the splicer which can be seen, design elements can also be formed in, or inscriptions can be applied. 
       FIG. 2  shows a perspective illustration of a splicer  20  according to one exemplary embodiment. The illustrated situation shows the splicer  20  with the cover or splicing cassette carrier  24  folded closed. The clamp  38  can in this case be used as a closure mechanism for the cover. The arrows indicate the rotation direction of the splicing cassette carrier  24  over the splicer  20 . 
     In the folded closed state, a covering apparatus  62 , which is arranged above the opening  30  for the splicing unit  10 , is located within the cutout, which can already be seen in  FIG. 1  and is bounded by the carrier arms  48  and the plate  56 . The covering apparatus  62  for the splicing unit  10  can likewise be opened via a shaft  64 , which is essentially parallel to the axis  54  for the splicing cassette carrier  24 . In this embodiment, the covering apparatus is in the form of a covering flap. It is also possible for the covering apparatus to be moved laterally over the opening  30 . The covering apparatus  62  can also be completely removed. It should be noted that the covering apparatus  62  and the splicing cassette carrier  24  are not impeded during their mutual movements about the axes, with the following exception: 
     A security apparatus  60  (see  FIG. 1 ) comprising a projection ensures that the covering apparatus  62  for the splicing unit  10  cannot be opened when the splicing cassette carrier is in the covering position ( FIG. 2 ). Thus, as an exception, in this specific example, the covering apparatus  62  cannot move past the projection of the security apparatus  60  of the splicing cassette carrier. A projection can likewise be provided for this purpose on the covering apparatus, and represents the corresponding opposing piece. 
     A cover  66 , which covers the shrinking unit, is arranged behind the covering apparatus  62 . A stop surface  70  is in each case located to the right and left of the cover  66 , and these stop surfaces  70  define a fixed rotation position, operatively related to the carrier arms of the rotatable splicing cassette carrier  24 . In this rotation position, the splicing cassette carrier  24  holds a splicing cassette  36  correctly (see  FIG. 5 ). In this example, the splicing cassette carrier cannot be rotated beyond the stop surfaces  70 . 
       FIG. 3  shows a similar perspective illustration of the splicer  20  as in  FIG. 2 , but with the splicing cassette carrier  24  folded open. In this position, the splicing cassette carrier  24  can be used as a handle or holder for the splicer  20 . In this case, the hand of the person carrying the splicer is placed in the cutout, that is bounded by the carrier arms  48  and the plate  56 , in order to hold the splicer  20  on the inner edge of the splicing cassette carrier  24 . 
     The control and/or display area  26 , which can now be seen freely in the folded-up state with a control area  26   b  and a display area  26   a , for example a TFT display, can also clearly be seen. It is likewise possible to see the stop surfaces  72 , which define a rotation position of the splicing cassette carrier  24  in which the latter is used as a cover for the control and/or display apparatus  26 . It is possible to provide the stop surfaces  72  with a sealing rubber, in order to prevent the ingress of dust or moisture to the control area  26   b  or the display area  26   a  in the covered state. 
       FIG. 4  shows a schematic illustration, in the form of a cross section from the side, of the situation shown in  FIG. 3 . The stop surfaces  72 ,  70  define an angle range α in which the splicing cassette carrier  24  can be rotated. The dashed lines in the extension of the stop surfaces indicate the corresponding rotation positions  71 ,  73  of the splicing cassette carrier  24 . It is clear to a person skilled in the art in the field of splicing technology that elements other than stop surfaces  70 ,  72 , for example projections, tabs, magnetic elements, etc. can also be used to limit the angle range α in order to define the cassette holding function and the covering function. The invention is not restricted to specific embodiments. 
     The splicing cassette carrier  24  is used as a handle or holder for the splicer  20  in a rotation position  75  in the middle within the range α. This exemplary embodiment provides for the center of gravity  82  of the splicer  20  to be arranged vertically below the rotation axis  54  or the shaft mounting  50 ,  52  when the splicer is placed on a flat surface  86 . In the process of placing the splicer  20  down, the feet  84 , which for example have an (elastic) damping function, meet this surface  86  at approximately the same time. This prevents shaking or sudden rotary movements. 
       FIG. 5  shows, in the form of a schematic side view, an exemplary embodiment in which the splicing cassette carrier  24  is used to hold the splicing cassette  36  correctly. The clamp  38  and stop pins  40  hold the splicing cassette  36 , as described initially, in a clamped-in and a fixed state. The control and display apparatus  26  is arranged, for example, in an opening  32  in the chassis  22  of the splicer  20  and is connected to a control unit  34  by means of which the individual processes of splicing etc. are carried out. In order to control the splicing process, the control unit  34  is likewise connected to the splicing unit  10 , which is accessible via the opening  30  when the covering apparatus  62  is open. 
       FIG. 6  shows a splicer with a covering apparatus  62  open. In this exemplary embodiment, the shaft  64  is arranged above the control and display apparatus  26 . A lighting device  63  is provided in the covering apparatus  62 . By way of example, the lighting device may be in the form of one or more light-emitting diodes. The lighting device  63  is arranged in the covering apparatus  62  such that the fiber holders  16  are illuminated when the lighting device is in an activated state. 
     Furthermore, the lighting device  63  is coupled to the control unit  34  such that the lighting device can be activated/deactivated by the control unit. In addition, the control unit  34  is also connected to a sensor unit  65 . By way of example, the sensor unit  65  may be in the form of a Hall sensor. The Hall sensor  65  detects a magnetic field which is produced by a magnet  19  which is arranged at an upper edge of the opening  30 . The opening and closing of the covering apparatus can therefore be detected by means of the Hall sensor detecting the magnetic field that is produced by the magnet  19 . For this purpose, the sensor unit  65  produces an appropriate control signal, which is passed on to the control unit  34 . 
     On opening of the covering apparatus  62 , the control unit operates the lighting device  63  such that the lighting device is activated in order to illuminate the splicing unit and in particular the fiber holders. The brightness of the light emitted by the lighting device is preferably variable. In this type of embodiment, the brightness of the light emitted by the lighting device can be increased slowly, for example, on opening of the covering apparatus. 
     The lighting device is deactivated by the control unit on closing of the covering apparatus. The lighting device is preferably deactivated more quickly than its activation, in order not to interfere with a video/camera recording system for the splicing unit, by means of which the entire splicing process can be observed on the display apparatus  26 . 
     A supply current for operating circuit components of the splicer, for example of the control and display apparatus  26  and of the splicing unit  10 , is provided by a supply device  35 . The supply device  35  provides the supply current for the circuit components via a controllable switch  33 . For example, the controllable switch  33  is in the form of a relay-operated switch. In one embodiment of the splicer, it is closed (switched on) when the splicing cassette carrier  24  is opened and is therefore in the rotation position  71 . When the splicing cassette carrier is closed and is located in the rotation position  73 , the relay-operated switch is switched off. The splicer can therefore be switched on and off by means of the splicing cassette carrier  24 . The splicer is switched on when the splicing cassette carrier  24  is moved from the position  73  to the position  71 , and is switched on when the splicing cassette carrier  24  is in the position  71 . On the other hand, the splicer is switched off when the splicing cassette carrier  24  is moved from the position  71  to the position  73 , and is switched off when the splicing cassette carrier  24  is located in the position  73 . 
     In another embodiment, the splicer can be operated in two different operating modes via the control unit  34 , with the supply device providing a higher supply current for the circuit components in a normal operating mode and producing a lower supply current in a standby mode, since the circuit components, for example the display apparatus  26   b , are in a rest state (sleep mode) in the standby mode. The control unit  34  operates the splicer in the normal operating mode or in the standby operating mode as a function of a rotation position of the splicing cassette carrier. 
     A sensor unit is provided in order to detect the rotation position that the splicing cassette carrier is in, and is connected to the control unit  34 . In one embodiment of the sensor unit, a magnetic field is detected. For this purpose, a magnet  47  is located under the plate  56  in the splicing cassette carrier  24 , as shown in  FIG. 3 . The magnetic field of the magnet  47  is detected by a Hall sensor  23  which, in the example in  FIG. 3 , is arranged under the control and display apparatus on the chassis  22 . When the splicing cassette carrier is in the closed state, the Hall sensor detects a strong magnetic field. In this case, either the relay-operated switch  33  is opened, as a result of which the splicer is switched off, or the splicer is switched to the standby mode, in which the power consumption of the circuit components  10 ,  26 ,  28  and  34  is reduced. If the supply device is in the form of a rechargeable battery, this allows the operational readiness of the splicer to be lengthened. When the splicing cassette carrier is opened (rotation position  71 ), the splicer is once again operated in the normal operating mode by the control unit. 
     By way of example, the sensor unit may also be in the form of a brightness sensor  27  which, as shown in the exemplary embodiment in  FIG. 3 , is arranged on the control and display apparatus  26  and, when the splicing cassette carrier is in the closed state, is covered or masked by it. Furthermore,  FIG. 3  shows a further embodiment of a sensor for detecting a rotation position of the splicing cassette carrier. For this purpose, a controllable switch  29  is arranged on at least one of the stop surfaces  72  of the chassis and, for example, is in the form of a contact pin. The contact pin is pushed down when the splicing cassette carrier is folded closed. The control unit then operates the splicer in the standby mode. 
     A further possibility to reduce the power consumption of the supply device  35  is to match the background lighting of the display apparatus  26   a , which, for example, is in the form of a TFT display, to the environmental brightness when the splicing cassette carrier is open. By way of example, the brightness sensor  27  can likewise be used for this purpose. The light intensity of the background lighting of the display apparatus is increased or decreased appropriately as a function of the environmental brightness detected by the brightness sensor. 
     In one preferred embodiment, not just one brightness sensor is provided. Instead of this, further brightness sensors  27   b  and  27   c  are fitted to the side surfaces alongside the stop surfaces  72 . This allows the background lighting of the display to be controlled as a function of direction. The background lighting of the display is controlled by the control unit  34  as a function of the brightness detected from different directions by the brightness sensors. 
       FIG. 5  also shows a simplified illustration, in the form of a sketch, of the steps in the splicing process. The configuration of the splicer is adjusted by means of the control and/or display apparatus  26 . Once the splicing cassette carrier  24  and the covering apparatus  62  have been opened, the fiber holders  16  are opened, and the fibers  18  are inserted (see  FIG. 6 ) in a first movement process  91 . The splicing process is then started via the control apparatus. After the splicing process, the spliced fibers are removed (reference symbol  92 ), and are inserted into the shrinking unit  28 . A shrink sleeve is shrunk onto the spliced fibers  18  there, under the influence of heat. The spliced and shrunk fibers are then removed, and the splicing cassette  31  is inserted (reference symbol  93 ). 
     Whilst all the fibers in a strip have been spliced or the cassette  36  has been filled, its content can first of all be processed and, if appropriate, the splicing process thus ended. The clamp  38  is released, the cassette  36  is removed, and the splicing cassette carrier  24  is once again folded back to the covering position shown in  FIG. 2 . This position prevents further contamination while the cable is being laid with the spliced fibers. If no further activities need to be carried out at that location, then the operator can fold the splicing cassette carrier  24  up again (to the position shown in  FIG. 3 ) in order to carry the splicer  20  to a different location where it is intended to be used again or stored once the work has been finally completed.