DE2258354A1 - DEVICE FOR THE FURTHER TRANSPORT OF SHEETS EJECTED BY A MULTIPLE CUTTING MACHINE - Google Patents

Description

PATENT ADVOCATE

DIPL.-ING. GERD COMMENTZ

7 STUTTGART I

CLIFF CORNER SEAT 4 TELEPHONE (07II) 4ö5644

November 23, 1972 P 1070 P

Merrill David MARTIN, 2, Mall Court, Oakland, Alameda County, California USA

Device for the onward transport of one Multiple cutting machine ejected sheets

The invention "relates to a device for onward transport of sheets from a multiple cutting machine to a stacking device, with a device for Delivery of the sheets from the multiple cutting machine in parallel rows and with a powered transport device for taking up each row of sheets delivered and for forwarding them to the stacking device transversely to the ejection direction of the dispensing device. Such Device can be used, for example, in the manufacture of corrugated paper sheets.

In the case of transport equipment for manufacturing machines of corrugated cardboard sheets arise when handling the Sheets have certain problems, and it is an object of the invention to provide a sheet transport device of to be flexible in their mode of operation, so that a confusion of stacks of sheets or \ ron individual leaves during their traasportea of the

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Corrugating device to a stacking device is avoided. The known relevant transport facilities production delays caused by such confusion under the sheets and the effort required are not negligible.

The task set is achieved according to the invention by that the device has devices for synchronizing the drive devices for the transport device with the ejection speed of the rows of sheets from the multiple cutting machine, in such a way, that successive rows of sheets the sheets immediately before placed on the transport device are superimposed so that the number of sheets in each stack is superimposed on the number of sheets in the multiple cutting machine corresponds, and that they have devices for delaying a change in speed of the transport device corresponding to each change in the ejection speed contains, in such a way that all sheets cut before the speed change are still on the transport device be ejected.

By synchronizing the speed of the transport device for lateral removal of the sheets at the cutting speed of the multi-cutter or the ejection speed This sonic machine ensures that the successive rows of the multiple cutting machine coming sheets are placed on top of each other on the transport device in stacks, each stack contains a number of sheets equal to the number of multiple cuts is equivalent to. By delaying the synchronization each time the ejection speed of the multiple

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foldable cutting machine for a sufficient period of time it is achieved that all e-sheets produced by the cutting machine before the change in their ejection speed be placed on the transport device "before the speed of the transport device to the changed Ejection speed is adjusted.

Another feature of the invention consists in the arrangement of stops along the transport device for lateral removal of the leaves. These stops are easily adjustable according to the width of the leaves, and this adjustment can be coordinated with a corresponding adjustment of stops on the stacking device will.

With an additional device, the transport device for the lateral transport of the sheets can easily be converted into a " device for a longitudinal transport of sheets that are longer than the width of the transport device by pivoting the stops into a release position and guides above the transport device optionally for this longitudinal transport can be attached.

Another feature of the invention is that the speed of the stacks when they are dropped from the transport device is increased in order to prevent the stacks from being pushed into one another, and then the stacks be transferred into an imbricated layer, and that finally by an increased speed of the stack transport device The sheets of the individual stacks are also staggered, i.e. arranged in a scale.

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Details of the invention emerge from the following description in conjunction with the drawing.

Show it;

Pig. 1 is a schematic perspective illustration of a transport device according to FIG the invention;

Fig. 1A is a schematic individual representation of the delay device in the hydraulic Facility control system!

lig. 2 shows a partial representation with pressing parts on acceleration rollers and on the transport device ;

Pig. 3 shows a partial plan view of the stops of the sideways transport device j

Pig. 4 · a partial representation of a stop, partly in section;

Pig. 5 shows an illustration of a stop slightly raised from a stack of sheets, partly in section;

Pig. Figure 6 is a view of the end of the sideways transport device with the stops located on it and with an adjustment device for the stops;

Pig. 7 one of the pig. 6 corresponding partial representation with raised stops;

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Pig. 8 is a partial illustration with the rollers and the frame of the transfer device in FIG a withdrawn position;

Pig. 9 is a partial illustration with the rollers of the transfer device in a raised position Position}

Pig. Figure 10 is a side view of the transfer device in a retracted position;

Pig. Figure 11 is a side view of the rollers of the transfer device when raised;

I *

Pig. 12 a partial top view of the drive part for the rollers of the transport device and for the rollers of the acceleration transport device;

Pig. Figure 13 is a partial cross-sectional view of the mechanism for lifting the transfer device j

Pig. 14 is a partial side view of the mechanism of the transfer device in FIG Position;

Pig. 15 a perspective partial representation of the end of the stack of the stack transport direction with adjustable stops;

Pig. 16 is a perspective partial illustration of a modified form of the width adjustment device the attacks "

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As can be seen from FIG. 1, the output end 1 of a corrugator has several knives, not shown which usually separate a single broad leaf into several narrower leaves. This process is common referred to as multiple cut and the device used for this is called a multiple cutting machine 2. The narrower sheets are ejected from the machine in parallel rows. In the illustrated Machine, the rows are discharged from the sheets 3 with a so-called sandwich transport device 4, which ejects the rows of sheets on a sideways transport device for a lateral removal of these sheets, so that they are then at least approximately at right angles to the transport direction of the sandwich transport device be moved on. The sheets 3 are discharged in the longitudinal direction onto the sideways transport device 6, like from Pig. 1 can be seen.

The sheets 3 are moved on the side transport device 6 at a speed which corresponds to the Speed is coordinated with which the rows of sheets 3 from the sandwich transport device 4 be ejected, such that the sheets on the sideways transport device 6 by about the width of a Sheet can be moved while the next row of sheets 3 is ejected. This creates a stacking of the sheets reached on the sideways transport device 6 to stacks of sheets. The number of sheets corresponds to 3 in each stack finally, the number of multiple cut sheets in each ejected from the sandwich transport device 4 Leaf row.

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The stacks formed from the sheets 3 are transported at the delivery end 7 of the sideways transport device "accelerates so that there is greater distance between result in the individual stacks of sheets and a sliding of the stacks into one another during their delivery from the side s transport device is avoided. The stacks are placed on a transport device 8, which runs slower than the accelerated delivery of the stacks takes place, whereby the stacks during their onward transport on a stack transport device 9 overlap like scales. The stack transport device 9 also promotes a higher speed than the transfer transport device 8, whereby first the bottom sheet of each stack and then the next one after the other Sheets are preferred to the sheets that follow upwards and are therefore the ones desired for stacking scale-like arrangement of the individual leaves is achieved.

The sideways transport device 6 is a roller transport device. On the upper side of a base frame, rollers 12 are rotatably mounted parallel to one another at a distance. An electric motor 13 with variable speed drives via a chain drive 14 and an upper one Chain wheel 16 one of the rollers 12, and via another external chain wheel 17 to the adjacent pivot pin 18. Further chain wheels 17 are also arranged outside of the roller axles 10 and connected to one another via chain drives 21 coupled, as can be seen from FIG.

The acceleration part of the facility is at the end of the drop-off 7 of the sideways transport device 6 and consists of acceleration rollers 22, the axes of which are in on arms arranged bearings 24 are rotatably mounted. The poor

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are connected to the base frame 11 in a suitable manner. The acceleration rollers 22 are provided with friction rings 27 arranged at a distance from one another, for example rubber rings, which act on the stack of sheets. The chain wheels for the acceleration roller have a smaller diameter than the sprockets 17 so that they cause the acceleration rollers to rotate faster.

An upper frame 31 is attached to the arms 26 at a distance from the acceleration rollers 22. On one of the rods 32 of the upper frame 31, a pair of pressure levers 33, which are arranged at a distance from one another, are pivotably mounted, at the free end of which a pressure wheel 34 is mounted, as can be seen from FIG. 2. The print wheels 34 rest on the stacks lying on the acceleration rollers 22 and ensure that the sheets remain held together in the stacks. Spring supports 37 extend from another rod 36 of the _{upper frame 31 a u} s over the transfer transport device 8, at the free end of which an articulated arm 38 for a printing wheel 39 with which the sheets are held stacked at the delivery end of the transfer transport device 8.

Along the sideways transport device 6 are with a Distance from the discharge end of the sandwich transport device 4 to stops 41, which is matched to the length of the sheets intended. These stops 41 have end plates 42 which are each hinged to a holding plate 43. Baths 44 of each holding plate 43 run on rails 46, as can be seen from FIGS. From the bottom of each Holding plate 43 protrude from eyes 48, to which the ends of a drive chain 47 are attached, which are via sprockets 49, which are arranged in the vicinity of the opposite ends of the rails 46. on An electric motor 51 is attached to the rail 46, which via a chain drive 52 generates a -9-

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Shaft 53 drives with which the two ends of the shaft 53 attached chain wheels 49 sur simultaneous adjustment the position of the retaining plates 43 and the brackets 41 and thus the distance from the sandwich transport before = - direction 4 can be adjusted according to the length of the blades 3.

The stops 41 also have a pivot axis 54 that is connected to the end plates 42. On the pivot axis, the hubs 56 are rotatably supported by levers 57, and the hubs 56 of the levers are held at a desired mutual distance by bushings 55. At the lower free end of each lever 57 ', a bearing pin 58 is arranged with bearings 59 arranged at a distance from one another. On the store a bullet-like shaped hollow Aasehlagkörper 61 is mounted so that it is directed to the sandwich Sransportvorriehtung. Each bullet-like stopper body 61 is aligned with a space between adjacent rollers, as can be seen from FIG. An arm 62 extends from each hub 56 in the opposite direction to the lever 57. A counterweight, with which the weight of the stop body 61 can be balanced, is arranged displaceably on each arm 62. As the ejected sheets 3 on the rollers. 12 are stacked one on top of the other, the counterweights 63 in the row of the carcass body are adjusted in steps by the assigned lobes, in order to take account of the increasing thickness of the stack. The balancing also depends on the thickness of the sheets and the stack formed by them. When the sheets 3 have been ejected from the Sanwieh transport device 4, they move in the longitudinal direction at considerable speed, and since the stop bodies 61 are at the height of the roll 12 Mawgg in the direction of the incoming Matter 3 taper ^ x ^ / ground these leaves aligned o. - ■

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A baffle plate 64 is mounted at an angle on a hollow support 66. The carrier 66 is with the end plates 42 connected, whereby the baffle 64 is arranged above and in front of the row of stop bodies 61, so that it can guide the ejected sheets 3 in the direction of and under the stopper 61. I'm another one hollow support 67 extends between the end plates behind the levers 57 and holds a stop plate 68 which prevents a sheet 3 from falling out of the device under the stop bodies. The stop plate 68 has an arcuate cut-out lower edge 69 which extends into the spaces between the rollers protrudes and thereby also prevents a sheet 3 through a between the lower edge of the stop plate and the gap resulting from the rollers 12 can penetrate to the outside. On top of the carrier 67 is a bracket 72 one end of a leaf spring 71 is attached, which presses on the upper side of the lever 57, as can be seen from FIG. 5, and which thereby causes a resilient arrangement of the balanced stop body 61.

To allow the leaves 3 to be ejected lengthways, in particular if the sheets 3 are longer than the width of the rollers 12, all stops 41 can be in the out Fig. 7 visible inoperative position can be pivoted. .Each end plate 42 has one over the plate pivot point 74 protruding long section 73. A counterweight rod 76 is on this section 73 far enough away from the pivot point 74 that the entire stop unit is balanced. At least one of the End plates 42 are provided with an opening 77 which is concentric with an opening 78 in the holding plate 43 is trained. In the inoperative position of the stops 41, the two openings 77 and 78 are aligned.

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each other, and by inserting a suitable pin into the two openings, the end plates 42 can with the entire anchor device are secured in the inoperative position.

When the stops 41 are in the inoperative position, the sideways transport device 6 can be reshaped for transporting the sheets 3 in the longitudinal direction by a liftable guide mechanism, which is shown in FIGS. 8 to 11 and 13 and 14. This guide mechanism has a pair of parallel frame members, such as the rails 81, which run at a distance transversely below the rollers 12 in the vicinity of the ends of the sideways transport device 6 and in the saw of the ends 82 of the base frame 11. Vertical cross plates 83 are on the. . "Rails 81 secured, and the cross-plates 83 fit pairwise in the spaces between the individual rollers in each pair of transverse plates 83 guide wheels 84 are mounted, so that the guide wheels are raised 84 by the rollers 12 upon lifting of the rails 81 and thus the Guide sheets 3 lengthways.

The one formed by the transverse plates 83 and the rails 81 rigid subframe is held by four parallel links. The link 86 connects one of the rails 81 to one neighboring legs of the base frame. Each link 86 is articulated to and attached to the base frame at its upper end its lower end is connected to the adjacent rail 81. Another pair of links 87 connect the other rail 81 with a lifting device. Each link 87 has its upper end connected to the adjacent rail 81 articulated. The links 87 are connected at their lower ends to a shaft 88. The basic frame

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has a pair of bearing plates 89 in which the shaft 88 is mounted, as can be seen from FIGS. 13 and 14. An actuating lever 91 is attached to the shaft 88 and assumes an angle of approximately 120 ° with the links 87. If the actuating lever is pivoted downward into the position indicated by dashed lines in FIG. 13, the links 87 are moved up an arc and toward the adjacent end 82 of the base frame. Since the members 86 and 87 run parallel to each other and practically together form a parallelogram, since the upper ends of links 87 move up and to one side, the lower ends of links 86 and follow move up a corresponding arc and away from the adjacent end 82 of the base frame, causing the Rails 81 and the transverse plates 83 together with the guide wheels 84 upwards over the plane of the rollers 12 be raised. This turns the sideways transport device 6 into a transport device for a straight line Further movement of the sheets in their longitudinal direction reshaped.

In the illustrated embodiment, the operating lever 91 pivoted downwards by inflating an airbag 90, the top of which is attached to a fixed Support frame part 95 supported iet and a downwardly directed Exerts force on a plate arranged at the tip of the operating lever. 14 is shown in the Embodiment of the actuating lever 91 is fork-shaped.

The transfer transport device 8 effects a scale-like arrangement of the stacks of sheets and transfers them to the stack transport device 9 _f which separates the individual sheets

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Sheets contained in the stacks causes ₉ as has already been described, and ai @ sheets 3 stacked in the end of the stack of the stack transport device. end stops 92 and 93 are provided in the usual way, which are slidably mounted on a quartz rod 94 of the adjustable iasehlagrahmans 9β.

A shaft 97 for width adjustment is mounted in end plates 98 of the stop frame 96. Each end stop 92 and is provided on its upper edge with a sleeve 99 which slides on the cross bar 94 and has a rectangular cross-section so that the jade stops cannot pivot . Protruding ears 101 of the hips 99 are provided with bores 102 through which the shaft 97 extends. In the embodiment shown in Fig. 15, the bores 102 of the end stop 93 are threaded, and the adjacent portion 103 of the shaft 97 is also threaded so that when the shaft 97 is rotated, the ears 102 of the end stop 93 close move along the threaded part 103 of the shaft 97 and thereby the end stop 93 is removed from the end stop 92 according to the width of the stacked sheets. In an embodiment as Mg ₀ 16 all ears of the sleeves are provided with a thread 99 ^ and the shaft 97a is unterteiltρ in two Gewinaeabsehnitte with opposite thread pitch so that the end stops are adjusted in © inander opposite directions 92 and 93 upon rotation of the shaft 97 »

The shaft 97 or 97a can be adjusted by means of a hand crank 104 or by means of a chain drive 106 and with the help of an electric motor 107 which is switchable in its Brehriohtiimg. The motor 107 and the motor 51 for di®

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Adjustment of the stops on the sideways transport device 6 are appropriately coordinated with their control devices so that they work synchronously and a synchronous one Width adjustment result.

The relative speeds of the facility's transport devices are predetermined, as in Pig. 1 indicated schematically is. The drive shaft 111 of the corrugating machine and multiple cutting machine 2 drives a tachometer control device

112, the speed changes of the drive shaft 111 are detected. The speedometer control device 112 is provided with a control device 113 for the electric motor with variable speed for the sideways transport device 6 on suitable Way coupled, also with the electric motors 114 and 116, which the transfer transport device 8 and the stack transports Drive rrichtung 9, so that at all speeds, the drive devices in a predetermined relative Move speed ratio. The response of the sideways transport device 6 to changes in speed becomes sufficiently long delayed so that from the sandwich transport device 4 all sheets 3, which occurred before the change in speed be ejected. This ensures that the ejected sheets 3 be deposited exactly in stacks on the sideways transport device 6. In the illustrated embodiment this delay is achieved by a bypass circuit in line 117, which is located between the control device

113 for the speed ratio and the electric motor extends. This shunt circuit has a capacitor of sufficient size caused by the speed change in the speedometer control device 112 Stores energy for a sufficient delay time.

If the transport devices by fluid motors

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are driven, the meter control device 112 acts to an electric motor 119 at ireiäaäerlioher speed one of the three pumps 121 with variable delivery rate drives, one fluid motor for each transport device. In the line 22, which is between the pump 121 with variable flow rate and the liquid motor 123 for the sideways transport device 8 extends, is a bypass line 124 inserted, which leads into a cylinder 126 with a piston 127 which is against a predetermined resistance, for example a spring 128, can be adjusted by a change in speed and a flow rate change to absorb pressure change occurring for a desired delay time.

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Claims (25)

-16 - 23. 11. 1972 claims 1.J device for the onward transport of sheets from a multiple cutting machine to a stacking device, with a device for delivering the sheets from the multiple cutting machine in parallel rows and with a driven transport device for receiving each delivered row of sheets and for forwarding them to the stacking device transversely to the ejection direction of the delivery device, thereby characterized in that it comprises devices (111, 112, 113) for synchronizing the drive devices (13, 14) for the lateral transport device (6) with the ejection speed of the rows of sheets (3) from the multiple cutting machine (2), such that Successive rows of sheets (3) are placed on sheets (3) that have been placed on the sideways transport device (6) immediately beforehand so that the number of sheets in each stack of sheets formed corresponds to the number of sheets of each row of sheets coming out of the multiple cutting machine, and that they apparatus ngen (117, 118) for delaying a speed change of the sideways transport device (6) in accordance with each change in the ejection speed, such that all sheets (3) cut before the speed change are still on the sideways transport device (6) at the old speed be ejected. 2. Transport device according to claim 1, characterized in that an electric motor with a variable drive device Speed is provided, and that the synchronizing devices a tachometer control device (112), the is driven by the multiple cutting machine (2) and controls the power supply to the motor (13), and the delay device has a capacitor (118) connected to the 409807/0297 -17- - 17 - November 23, 1972 Speedometer control device (112) and the motor (13) is connected and one for the desired waiting time has sufficient loading capacity. 3. Transport device according to claim 1, characterized in that that. the drive device is a liquid motor (123) is. 4ο! Transport device according to claim 3, characterized in that that they have a pump (121) with variable delivery rate for the liquid motor (123) and an electronic tube (119) for driving the pump (121), and that the synchronizing device is a tachometer control device driven by the multiple cutting machine (2) (112) and a delay device (124, 126, 4S * 127, 128), which has a shunt line (124) comprises, which branches off from the line (122) between the pump (121) and the liquid motor (123) and to one Pressure storage device (ΐ 26,127,128) leads. 5. Transport device according to one of claims 1 to 4, characterized in that a sandwich transport device (4) for transporting the sheets (3) in the longitudinal direction is provided for the delivery of the sheets on the sideways transport device (6) with the formation of stacks, and that this sideways transport device carries the stacks moved in the direction of the width of the leaves (3) «, 6. Transport device according to one of claims 1 Ms 5? characterized in that stops (41) are provided along the sideways transport device (6) _? which are arranged at a distance from the ejection device which corresponds approximately to the width of the sheets (3) " AO9807 / 0297 - 18 - November 23, 1972 7. Transport device according to claim 6, characterized in that that the stops (41) have Ansohlagkörper (61), and that one side of each stopper (61) away from the sideways B-transport device and is curved in the direction of the ejection device, so that the sheets (3) under the stop bodies (61) fit. 8. Transport device according to claim 7, characterized in that the stop body (61) individually and are rotatably mounted independently of each other. 9. Transport device according to claim 8, characterized gekennzdclinet, that counterweights (63) are provided for each stop body (61), and that the counterweights (63) in the moving direction of the sheets are staggered differently from each other to allow the stacks of sheets to grow (3) to be taken into account during their movement on the sideways transport device (6). 10. Transport device according to one of claims 6 to 9, characterized in that each stop body (61) has the shape of a projectile directed against the leaves (3). 11. Transport device according to one of claims 8 to 10, characterized in that the supports for the stop bodies (61) have a pivot axis (54) which extends extending above the sideways transport device (6), and that end plates (42) at each end of the transport device for carrying the swivel axis (54), retaining plates (43) -19- AO9 807/0297 - 19-23 November 1972 at each end of the transpoartvorrientusLg (β) to the articulated Support of the end plates (42), © in on the Solweak = -. axis (54) pivoted lever (57) * on w © lehem the stop body (61) is arranged, bearing parts "(58,! on the lever (57), which are located in the stop head extend in and allow its rotation, a J of the lever (57) extending from the pivot axis (54) in the direction of the ejection device, © in Counterweight (63) which is adjustably arranged on the arm (62), and parts (55,56) for holding the individual stopper bodies (61) are provided at a distance from one another and above the sideways H-transport device (6). 12. Transport device according to one of claims 7 to 11, characterized in that it includes a baffle (64) which extends towards the ejector extends diagonally upwards and the incoming e-leaves (3) deflects and forces under the stop body (61). 13. Transport device according to claim 12, characterized by Teder members (71,72) two biasing of the lever (57) and the stop body (61) in the direction of the sideways transport device (6). 14. Transport device according to one of claims 6 to 13, characterized in that it is a distance from the Stop plate (68) attached to stops (41) for stopping the stops (41) extending beyond the stops (41) Has sheets (3) which is attached to a carrier (67). 15. Transport device according to one of claims 6 to 14, characterized in that one for the stops -20 409807/0297 20-23 November 1972 adjustable retaining plate (43) is provided, which is connected to a drive device (4-1,47,44) and an adjustment of the stops (41) in adaptation to the width of the sheets (3) allows. 16. Drive device according to claim 15 »characterized in that that the stacking device has a stack transport device (9), end stops (92,93) at the delivery end of the stack transport device (9) for aligning the stacked sheets (3) and a device (107,97) for adjustment of the end stops (92,93) in adaptation to the width of the sheets according to the width adjustment for the stops (41). 17. Transport device according to claim 16, characterized in that that the adjusting devices for the stops (41) and for the end stops (92,93) are electrical and are driven synchronously. 18. Transport device according to one of claims 1 to 17, characterized in that the sideways transport device multiple transport rollers (12) and means for accelerating the rotation of sets of rollers (22) in the vicinity of the delivery end of the transport device, and that a transfer transport device (8) between the stacking device and the sideways transport device (6) is provided at a speed slower than the acceleration speed works at the discharge end of the sideways transport device. 19. Transport device according to one of claims 1 to 18, characterized in that the stacking device is a Having stack transport device (9) which operates at a greater speed than the transfer string port device (8th). -21- 409807/0297 - 21 - November 23, 1972 20. Transport device according to claim 13, 18 or 19, characterized in that pressure members (34, 39) for acting on the stack of sheets in the region of the section the transport device (6) are provided for an accelerated delivery. 21. Transport device according to one of claims 1 to 20, characterized in that.die sideways transport device (6) several transport rollers (12) and a device (73, 74) for lifting the stops (41) in an inoperative position as well as an optional between the rollers (12) above the level of these rollers (12) has liftable device (83, 84) for guiding the sheets (3) in their longitudinal direction above the rollers (12). 22. Transport device according to claim 21, characterized in that that the liftable device has a frame (81, 82) which is arranged below these rollers (12), transverse plates (83) protruding from this frame, which protrude between several adjacent rollers (12), and guide members (84) mounted on these transverse plates (83) for guiding the sheets (3) in their longitudinal direction has above the rollers (12), and that a device (90,91) for lifting the frame and thus for The guide links are raised above the level of the rollers (12). 23. Transport device according to claim 22, characterized in that the frame (81, 82) and the transverse plates (83) are rigid, that Sohwenkglieder (86,87) arranged in the manner of a parallelogram xmä with the liftable frame and with the frame d @r transport device (β) for lifting and canceling the entire frame v © rbund @ a -22- 409807/0297 225835A - 22 -. November 23, 1972 are, and that at least one of the terms (86.87) on one side of the frame with an actuating device for pivoting the links and for holding the link is connected in a raised position. 24. Transport device according to claim 23 »characterized in that the drive device has a shaft (88) which extends along one side of the frame of the transport device (6) parallel to the liftable frame (81,82) extends and is mounted in the frame of the transport device (6), and that the links (87) on the relevant side of the liftable frame are connected to the shaft and by a with a Operating lever (91) caused rotation of the shaft are pivotable. 25. Transport device according to claim 24, characterized in that a hydraulic device (air bag 90) is provided for exerting a rotational force on the operating lever (91). 409807/0297 Lee r