Deflecting device for deflecting a conveyed sheet

Abstract

A deflecting device for deflecting a conveyed sheet includes a guiding assembly having an inlet for receiving a conveyed sheet front an upstream section of a main conveying path, a primary outlet for discharging a conveyed sheet onto a downstream section of a main conveying path, a secondary outlet for discharging a conveyed sheet onto an initial section of a side conveying path, and a passing area for passing a conveyed sheet from the inlet towards the primary outlet; and a deflector for deflecting a conveyed sheet towards the secondary outlet, movable into a receiving position for receiving a leading edge of a conveyed sheet inside the passing area and movable into a discharge position for discharging a leading edge of a conveyed sheet towards the secondary outlet, wherein the deflector defines a curved trajectory for a conveyed sheet deflected towards the secondary outlet in the discharge position, wherein one side of the curved trajectory faces the primary outlet. A functional portion of the deflector is configured to be inserted into the passing area on the one side of the curved trajectory when the deflector moves into the receiving position, and to be retracted from the passing area on the one side of the curved trajectory when the deflector moves out of the discharge position.

Claims

1. A deflecting device for deflecting a conveyed sheet, comprising: a guiding assembly having an inlet for receiving the conveyed sheet from an upstream section of a main conveying path, a primary outlet for discharging the conveyed sheet onto a downstream section of the main conveying path, a secondary outlet for discharging the conveyed sheet onto an initial section of a side conveying path, and a passing area for passing the conveyed sheet from the inlet towards the primary outlet; and a deflector for deflecting the conveyed sheet towards the secondary outlet, movable into a receiving position for receiving a leading edge of the conveyed sheet inside the passing area and movable into a discharge position for discharging the leading edge of the conveyed sheet towards the secondary outlet, wherein the deflector defines a curved trajectory for the conveyed sheet deflected towards the secondary outlet in the discharge position, wherein one side of the curved trajectory faces the primary outlet, wherein a functional portion of the deflector is a portion extending from the receiving position to the discharge position when the deflector is in the discharge position, wherein the functional portion includes an elongated body having a straight deflector surface along substantially an entire length thereof, and wherein the function portion is configured to be inserted into the passing area on the one side of the curved trajectory when the deflector moves into the receiving position, and to be retracted from the passing area on the one side of the curved trajectory when the deflector moves out of the discharge position.

2. The deflecting device according to claim 1, wherein the functional portion is configured to be inserted into the passing area from a side of the passing area opposite a side of the passing area facing the secondary outlet.

3. The deflecting device according to claim 1, wherein the deflector is configured to move through the receiving position at a certain speed before moving into the discharge position.

4. The deflecting device according to claim 1, wherein the functional portion is configured to move at least as fast as the conveyed sheet when the deflector moves from the receiving position into the discharge position.

5. The deflecting device according to claim 1, wherein the deflector surface for receiving the leading edge of the conveyed sheet has an inclined orientation with respect to the upstream section of the main conveying path in the receiving position of the deflector.

6. The deflecting device according to claim 1, wherein the deflector surface for discharging the leading edge of the conveyed sheet extends in line with the initial section of the side conveying path in the discharge position of the deflector.

7. The deflecting device according to claim 1, wherein a speed of motion of the functional portion has a component extending in parallel to the deflector surface for receiving the leading edge of the conveyed sheet when the deflector moves through the receiving position.

8. The deflecting device according to claim 1, wherein a speed of motion of the functional portion has a component extending in parallel to the deflector surface for discharging the leading edge of the conveyed sheet when the deflector moves into the discharge position.

9. The deflecting device according to claim 1, wherein a path of motion of the functional portion is straight or curved.

10. The deflecting device according to claim 1, wherein the functional portion tapers into a tip.

11. The deflecting device according to claim 1, wherein the functional portion is configured to be inserted into the passing area at an acute angle with respect to the main conveying path or at least the upstream section thereof.

12. A sheet handling system comprising the sheet deflecting device according to claim 1 for deflecting the conveyed sheet from the main conveying path to the side conveying path.

13. A printing system comprising a printing path for conveying a stream of individual sheets of an image recording medium past a print engine, and a returning path for returning certain sheets of the image recording medium from an end of the printing path back to a start of the printing path, the printing system comprising the deflecting device according to claim 1 for selectively deflecting the individual sheets of the image recording medium from the main conveying path to the returning path.

14. The deflecting device according to claim 2, wherein the deflector is configured to move through the receiving position at a certain speed before moving into the discharge position.

15. The deflecting device according to claim 2, wherein the functional portion is configured to move at least as fast as the conveyed sheet when the deflector moves from the receiving position into the discharge position.

16. The deflecting device according to claim 3, wherein the functional portion is configured to move at least as fast as the conveyed sheet when the deflector moves from the receiving position into the discharge position.

17. The deflecting device according to claim 2, wherein the deflector surface for receiving the leading edge of a conveyed sheet has an inclined orientation with respect to the upstream section of the main conveying path in the receiving position of the deflector.

18. The deflecting device according to claim 1, wherein the straight deflector surface maintains a substantially constant angle when being moved from the receiving position to the discharge position.

19. The deflecting device according to claim 1, wherein the straight deflector surface is generally parallel to the initial section of the side conveying path when the deflector is in the receiving position.

20. A method for deflecting a conveyed sheet from a main conveying path towards a side conveying path, comprising the steps of: bringing a deflector into the main conveying path ahead of the conveyed sheet in a first position in which a deflector surface provided on the deflector is arranged for receiving a leading edge of the conveyed sheet and guiding the leading edge towards a discharge end of the deflector in a direction deviating from the direction of conveyance along the main conveying path; after receiving the leading edge of the conveyed sheet, moving the deflector towards a second position in which the discharge end is positioned closer to an initial section of the side conveying path than in the first position; discharging the leading edge of the conveyed sheet onto the initial section of the side conveying path, and retracting the deflector from the second position and the main conveying path, wherein a functional portion of the deflector is a portion extending from the first position to the second position when the deflector is in the second position, and wherein the functional portion includes an elongated body having the deflector surface for receiving the leading edge of the conveyed sheet, the deflector surface being straight along substantially an entire length thereof.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) The invention will be described in more detail with reference to the drawings, wherein:

(2) FIG. 1 shows, in a schematic representation, a printing system composing a print engine and a sheet handling system;

(3) FIG. 2 shows, in a schematic cross-sectional representation, a first embodiment of a deflecting device according to the invention, comprising a guiding assembly and a movable deflector;

(4) FIGS. 3a-3h and FIG. 4 show the deflecting device of FIG. 2 in various stages of operation with the deflector in various positions with respect to the guiding assembly, and

(5) FIG. 5 shows, in a schematic cross-sectional representation, a second embodiment of a deflecting device according to the invention.

DETAILED DESCRIPTION OF EMBODIMENTS

(6) With reference to FIG. 1, a printing system 3 for printing on a cut-sheet image recording medium such as sheet paper of a certain size comprises a print engine 100 for printing an image on a single side of an individual sheet of the image recording medium and a sheet handling system 200.

(7) The sheet handling system 200 has a printing path P for conveying a stream of individual sheets of the image recording medium in a specific orientation past the print engine 100, and a returning path R for returning certain sheets of the image recording medium from an end of the printing path P after the print engine 100 back to a start of the printing path P before the print engine 100.

(8) The printing path P is part of a main conveying path M for conveying a stream of individual sheets through the sheet handling system 200 from a system inlet 4 to a system outlet 5.

(9) A deflecting device 1, 2 for deflecting certain sheets from the main conveying path M to the returning path R is situated on the main conveying path M at the end of the printing path P.

(10) An introducing device 6 for introducing sheets from the returning path R back onto the main conveying path M is situated on the main conveying path M at the start of the printing path P.

(11) A flipping device 7 for changing the orientation of a sheet conveyed along the returning path R is arranged on the returning path R between the deflecting device 1, 2 and the introducing device 6.

(12) In operation of the printing system 3, an unprinted sheet is received onto the main conveying path M via the system inlet 4, and then conveyed to pass undisturbed through the introducing unit 6 towards the printing path P.

(13) On the printing path P, the unprinted sheet may receive a printed image on a side of the sheet that is presented to the print engine 100 for receiving such an image.

(14) In case only a front side of a sheet needs to be printed, a sheet coming from the printing path P which has only one time passed the print engine 100 may be conveyed further along the main conveying path M. and may pass undisturbed through the deflecting device 1, 2 towards the system outlet 5.

(15) In case a back side of a sheet needs to be printed, a sheet coming from the printing path P which has only one time passed the print engine 100, and which may already have a printed front side, is conveyed to be deflected by the deflecting device 1, 2 from the main conveying path M towards the returning path R.

(16) A sheet conveyed along the returning path R is flipped by the flipping device 7, and the sheet is then introduced back onto the main conveying path M and the printing path P in a reverse orientation by the introducing unit 6.

(17) A sheet coming from the printing path P which has passed the print engine 100 for a second time may still be conveyed to pass undisturbed through the deflecting device 1, 2 towards the system outlet 5.

(18) With reference to FIG. 2, in a first embodiment of the invention, a deflecting device 1 comprises a guiding assembly 40 having a set of guides 44, 45, 46 enclosing an interior space 64.

(19) The interior space 64 has an inlet 41 for receiving a leading portion of a conveyed sheet from an incoming conveying path 61. With reference to FIG. 1, the incoming conveying path 61 forms, or at least connects to an upstream section of the main conveying path M comprising an end section of the printing path P.

(20) The interior space 64 further has a primary outlet 42 for discharging a leading portion of a conveyed sheet onto a primary outgoing conveying path 62, and a secondary outlet 43 for discharging a leading portion of a conveyed sheet onto a secondary outgoing conveying path 63. With reference to FIG. 1, the primary outgoing conveying path 62 forms, or at least connects to a downstream section of the main conveying path M extending towards the system outlet 5, and the secondary outgoing conveying path section 63 forms, or at least connects to an initial section of the returning path R.

(21) The primary outlet 42 is positioned relative to the inlet 41 such that a leading portion of a conveyed sheet received inside the interior space 64 via the inlet 41 will be able to pass towards the primary outlet 42 merely as a result of a connected trailing portion of the conveyed sheet being propelled along the incoming conveying path 61, for instance by a pair of pinching rollers 301 positioned along the main conveying path M upstream of the inlet 41.

(22) In the shown example, the primary outgoing conveying path 62, or at least a portion thereof defined by a primary outgoing guiding channel 48 starting at the primary outlet 42, extends in line with the incoming conveying path 61, or with at least a portion thereof defined by an incoming guiding channel 47 ending at the inlet 41. This enables a leading portion of a conveyed sheet received via the inlet 41 to be directed towards the primary outlet 42 merely as a result of its stiffness, wherein the leading portion passes through a passing area 65 defined within the interior space 64 providing a direct route for a leading portion of a conveyed sheet from the inlet 41 to the primary outlet 42.

(23) The secondary outlet 43 is arranged on one side 65b of the passing area 65, at a certain distance away from the passing area 65, and positioned in between the inlet 41 and the primary outlet 42 when seen in the direction of conveyance of a sheet passing through the passing area 65.

(24) The secondary outgoing conveying path 63, or at least a portion thereof defined by a secondary outgoing guiding channel 49 starting at the secondary outlet 43, is positioned at an acute angle to the primary outgoing conveying path 62, or at least a portion thereof defined by the primary outgoing guiding channel 48.

(25) A pair of pinching rollers 302 is positioned along the main conveying path M downstream of the primary outlet 42, as an example of a device for propelling a conveyed sheet along the primary outgoing conveying path 62 once at least a leading portion of a conveyed sheet has been discharged onto the primary outgoing conveying path 62 via the primary outlet 42.

(26) A further pair of pinching rollers 303 is positioned along the returning path R downstream of the secondary outlet 43, as an example of a device for propelling a conveyed sheet along the secondary outgoing conveying path 63 once at least a leading portion of a conveyed sheet has been discharged onto the secondary outgoing conveying path 63 via the secondary outlet 43.

(27) A guide 44 extending between the inlet 41 and the primary outlet 42 on a side 65a of the passing area 65 opposite a side 65b facing the secondary outlet 43 extends in parallel to the passing area 65 or at least in parallel to a direction of conveyance of a sheet passing through the passing area 65, to prevent a leading edge of a conveyed sheet passing through the passing area 65 from escaping the passing area 65 on said opposite side 65a.

(28) A guide 45 extending between the inlet 41 and the secondary outlet 43 has a curved shape, such that the guide 45 extends in parallel to the incoming conveying path 61 at the inlet 41, and the guide 45 extends in parallel to the secondary outgoing conveying path 63 at the secondary outlet 43.

(29) A guide 46 extending between the primary outlet 42 and the secondary outlet 43 has an orientation for guiding a leading edge of a conveyed sheet towards the primary outlet 42 in case a leading edge of a conveyed sheet passes through the interior space 64 outside the passing area 65 and the leading edge is received by said guide 46.

(30) The deflecting device 1 further comprises a deflector 50 for deflecting a conveyed sheet towards the secondary outlet 43, movable into a receiving position P1 as shown in FIG. 3c for receiving a leading edge of a conveyed sheet inside the passing area 65, and further movable into a discharge position P2 as shown in FIG. 2 for discharging a leading edge of a conveyed sheet towards the secondary outlet 43.

(31) The deflector 50 comprises a functional portion 53 having a deflecting surface 51 arranged for receiving a leading edge of a conveyed sheet inside the passing area 65 in the receiving position P1 and arranged for discharging a leading edge of a conveyed sheet towards the secondary outlet 43 in the discharge position P2.

(32) The functional portion 53 has a discharge end 52 at which a leading edge of a conveyed sheet can be discharged from the deflecting surface 53.

(33) The deflector 50 is movable into the receiving position P1 from an inoperative position P0 as shown in FIG. 2 in which the functional portion 53, and especially a tip section 54 thereof comprising a portion of the deflecting surface 51 and the discharge end 52, is situated outside the passing area 65 at the side 65a of the passing area 65 opposite the side 65b facing the secondary outlet 43.

(34) The functional portion 53, and especially a tip section 54 thereof composing a portion of the deflecting surface 51 and the discharge end 52, is configured to be inserted into the passing area 65 from said side 65a of the passing area 65 opposite the side 65b facing the secondary outlet 43 when the deflector 50 moves from the inoperative position P0 into the receiving position P1.

(35) In the shown example, the functional portion 53 has an elongated shape. The functional portion 53 is configured to be inserted into the passing area 65 at an acute angle with respect to the incoming conveying path 61, so that in the receiving position P1 of the deflector 50, the deflecting surface 51 has an inclined orientation with respect to said incoming conveying path 61.

(36) From the receiving position P1, the deflector 50 is movable into the discharge position P2, which in the shown embodiment differs from the receiving position P1 in the sense that the discharge end 52 is located closer to the secondary outlet 43 in the discharge position P2 than in the receiving P1.

(37) In the embodiment of FIG. 2, the functional portion 53 is configured to perform a purely translational motion along a straight line in moving from the inoperative position P0 into the discharge position P2 via the receiving position P1.

(38) In the discharge position P2 of the deflector 50, the deflecting surface 51 extends in line with the secondary outgoing conveying path 63.

(39) As a result of an inclined orientation of the deflecting surface 51 with respect to the incoming conveying path 61 in the discharge position P2 and as a consequence of the deflecting surface 51 also acting as a guiding surface 51 for a conveyed sheet deflected towards the secondary outlet 43 once at least a leading portion of such a conveyed sheet has been discharged onto the secondary outgoing conveying path 63, the deflector 50 defines a curved trajectory 66 for a conveyed sheet deflected towards the secondary outlet 43 in the discharge position P2.

(40) With the deflector 50 in the discharge position P2, the curved trajectory 66 provides a direct route for a trailing portion of a conveyed sheet from the inlet 41 to the secondary outlet 42 once a leading portion of the conveyed sheet has been discharged onto the secondary outgoing conveying path 63, through an area of the interior space 64 which is delimited on one side by the deflector 50 and on the other side by the curved guide 45 extending between the inlet 41 and the secondary outlet 43.

(41) It is noted that by the deflector 50 being movable from the inoperative position P0 to the receiving position P1 as described, the functional portion 53, and especially a tip section 54 thereof comprising a portion of the deflecting surface 51 and the discharge end 52, is configured to be inserted into the passing area 65 on a side 66a of the curved trajectory 66 facing the primary outlet 42 when the deflector 50 moves into the receiving position P1.

(42) From the discharge position P2, the defector 50 is movable back into the inoperative position P0, wherein the functional portion 53, and especially a tip section 54 thereof comprising a portion of the deflecting surface 51 and the discharge end 52, is configured to be retracted from the passing area 65 at the side 65a of the passing area 65 opposite the side 65b facing the secondary outlet 43.

(43) It is noted that by the deflector 50 being movable from the discharge position P2 to the inoperative position P0 as described, the functional portion 53, and especially a tip section 54 thereof composing a portion of the deflecting surface 51 and the discharge end 52, is configured to be extracted from the passing area 65 on the side 66a of the curved trajectory 66 facing the primary outlet 42 when the deflector 50 moves out of the discharge position P2.

(44) With reference to FIG. 2 and FIG. 3a, in the inoperative position P0 of the deflector 50, the functional portion 53 is situated outside the passing area 65 to allow a conveyed sheet 10a to pass undisturbed from the inlet 41 towards the primary outlet 42.

(45) With reference to FIG. 2 and FIG. 3d, when a sheet 10b following a leading sheet 10a passing towards the primary outlet 42 is to be deflected towards the secondary outlet 43, the deflector 50 moves into the receiving position P1, wherein the tip section 54 of the functional portion 53 is inserted into the passing area 65 in between the trailing edge 12a of the leading sheet 10a and the leading edge 11b of the following sheet 10b.

(46) With reference to FIG. 2 and FIG. 3c, while the deflector 50 moves through the receiving position P1 at a certain speed, the leading edge 11b of the sheet 10b to be deflected is received by a portion of the deflecting surface 51 provided on the tip section 54 of the functional portion 53.

(47) With reference to FIG. 2 and FIG. 3d, from the receiving position P1, the deflector 50 moves into the discharge position P2, wherein the received leading edge 11b of the sheet 10b to be deflected moves together with the functional portion 53 to a position closer to the secondary outlet 43.

(48) With reference to FIG. 2 and FIG. 39, when the deflector 50 reaches the discharge position P2, the received leading edge 11b of the sheet 10b to be deflected is discharged from the deflecting surface 51 at the discharge end 52 of the functional portion 53, as a result of the functional portion 53 coming to a halt while the deflected sheet 10b is being conveyed further, wherein the functional portion 53 acts as a guide guiding the sheet 10b towards the secondary outlet 43.

(49) With reference to FIG. 2 and FIG. 3f, the deflector 50 may be held in the discharge position P2 until a sheet 10c following the deflected sheet 10b, which next sheet 10c is not to be deflected, approaches the passing area 65.

(50) With reference to FIG. 2 and FIG. 3g, according to an advantageous aspect of the invention, the deflector 50 can be moved back from the discharge position P2 towards the inoperative position P0 already before a portion of the deflected sheet 10b comprising the trailing edge 12b has bean discharged from the interior space 64 via the secondary outlet 43.

(51) With reference to FIG. 2 and FIG. 3h, once the trailing edge 12b of a deflected sheet 10b has left the passing area 65, the passing area 65 is free to receive the leading edge 11c of a sheet 10c following a deflected sheet 10b once the tip section 54 comprising a portion of the deflecting surface 51 and the discharge end 52 is again situated outside the passing area 65, incase such a sheet 10c following a deflected sheet 10b is to be passed undeflected towards the primary outlet 42.

(52) In summary, a method for deflecting a conveyed sheet 10b from a main conveying path M towards a side conveying path R performed by the deflecting device 1 of FIG. 2 comprises the steps of ahead of the sheet 10b, bringing a deflector 50 into the main conveying path M in a first position P1 in which a surface 51 provided on the deflector 50 is arranged for receiving a leading edge 11b of the sheet 10b and guiding the leading edge 11b towards a discharge end 52 of the deflector 50 in a direction deviating from the direction of conveyance along the main conveying path M; after receiving the leading edge 11b, moving the deflector 50 towards a position P2 in which the discharge end 52 is positioned closer to an initial section 63 of the side conveying path R than in the first position P1. discharging the leading edge 11b onto the initial section 63 of the side conveying path R, and retracting the deflector 50 from the second position P2 and the main conveying path M.

(53) In order for the functional portion 53 to have a certain speed when the deflector 50 moves through the receiving position P1, the deflector 50 may be accelerated already outside the main conveying path M. The speed of the functional portion 53, or at least the speed of the tip portion 54 in the direction of motion of the tip portion 54 preferably equals at least the speed of conveyance of a sheet 10b received and deflected by said functional portion 53, so that the deflector 50 can reach the desired discharge position P2 with the discharge end 52 positioned ahead of the leading edge 11b of the sheet 10b before the leading edge 11b is discharged towards the secondary outlet 53.

(54) The velocity of the functional portion 53 preferably has a component extending in parallel to the deflecting surface 51 at the location for receiving a leading edge 11b of a sheet 10b to be deflected when the deflector 50 moves through the receiving position P1, and preferably has a component extending in parallel to the deflecting surface 51 at the location for discharging a leading edge 11 of a sheet 10b to be deflected when the deflector 50 moves into the discharge position.

(55) The functional portion 53, or at least a portion for receiving a leading edge 11b of a sheet 10b to be deflected preferably also has a velocity component extending in the direction of conveyance along the main conveying path M when the deflector 50 moves through the receiving position, to limit the effects of the leading edge 11b colliding with the deflector 50.

(56) An actuation mechanism for moving the deflector 50 between the different positions can be triggered by a sensor for sensing the leading edge 11b of a sheet 10b to deflected passing a sensing location upstream of the inlet 41, or may controlled according to a timing schedule according to which individual sheets 10a, 10b, 10c are made to be conveyed along the main conveying path M.

(57) It is noted that a device as described may still be useful for deflecting a conveyed sheet 10b when the leading edge 11b of the sheet 10b lies close to the trailing edge 12a of a leading sheet 10a passing towards the primary outlet 42 without a substantial interstitial space, or when a leading portion of a sheet 10b to be deflected even overlaps with a trailing portion of a sheet 10a passing towards the primary outlet 42, possibly as a result of one of the sheets 10a. 10b having a skewed position with respect to the other one.

(58) With reference to FIG. 2 and FIG. 4, in such a case, the leading edge 11b of a sheet 10b to be deflected may be received onto the functional portion 53 inside the interior space 64 outside the passing area 65 after the functional portion 53 has been inserted sufficiently far into the interior space 64, such that the discharge end 52 of the deflector 50 passes the leading edge 11b of the sheet 10b while moving towards the discharge position P2 after a portion 13b of the sheet 10b connected to the leading edge 11b has already been received onto the deflecting surface 51.

(59) Especially in such a case, or in the case that the leading edge 11b is located ahead of the location of insertion of the functional portion 53 into the passing area 65 at the time of the insertion, it is important for the discharge end 52 to move faster than the deflected sheet 10b In order for the discharge end 52 to reach a position close to the secondary outlet 53 before the leading edge 11b is discharged from the deflecting surface 51, and to prevent a leading portion 13b of the deflected sheet 10b from reaching the guide 46 extending between the primary outlet 42 and the secondary outlet 43.

(60) In the shown example, the guide 45 extending between the inlet 41 and the secondary outlet 43 and the guide 46 extending between the primary outlet 42 and the secondary outlet 43 each deviate away from the passing area 65 when seen in the direction towards the secondary outlet 43, so that a trailing portion 14a of a sheet 10a passing towards the primary outlet 41 and a leading portion 13b of a sheet 10b deflected towards the secondary outlet 43 are each allowed to move together with the functional portion 53 while the deflector 50 moves towards the discharge position P2, in order to prevent either of those portions 13b, 14a from getting stuck between the functional portion 53 and one of those guides 45, 46.

(61) With reference to FIG. 5, in a practical embodiment, a deflecting device 2 according to the invention may comprise an actuation mechanism 60 for rotating the deflector 50 in order to move the deflector 50 between the inoperative position P0, the receiving position P1 and the discharge position P2 The functional portion 53 may then be connected to an arm 55 rotated by the actuation mechanism 60, such that the functional portion 53 assumes different positions with respect to the guiding assembly 40 depending on the degree of rotation of the arm 55. It is noted that in such an embodiment, an angle of inclination of the functional portion 53 with respect to the main conveying path M may vary depending on the position of the deflector 50, and a path of motion followed by the discharge end 52 may be curved, rather than straight.

(62) It is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Specific structural and functional details are not to be interpreted as limiting, but merely as a basis for the claims and as a teaching for one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. In particular, features presented and described in separate dependent claims may be applied in combination, and any advantageous combination of such claims is herewith disclosed.

(63) The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.