DE1572331A1 - Developing device with an electrostatographic drum - Google Patents

Description

Dlpl.-lng. R. H. Bahr

Dip J. Phyt. E. Btzif , __ ".. *" £ ü * ^ L. Ι, **** «ο

IMpL-lng. W. Herrmann-Trantepohl lo / tool r ***** «: η ar η a so ·» ^ sue

PATENT LAWYERS Ta I ax β »« AMtr tt Qaorgaplatt t / ll

Talax MMMt

·. M 00 504 WA / i

AHLSIDE LIMITED, 14 Craufurd Hise, Maidenhead, Berkshire, England

Descender device with an electrostatographic sn Drum.

The invention relates to a developing device with an electrostatographic drum, the drive of which can be controlled by a main switch,

In another unpublished patent application (German patent application A 55564 IXa / 57e) such a device is claimed, on the im Reference is made below.

This application shows a heating device »die.zum Melting a copier provided with a powder

ÖöOÖÖi / 1i.7i

_ _? _ 157233t

paper is intended for the purpose of producing an original document. A conveying device for the original document and an electrical circuit are also provided, which can be actuated by the original document to control the heating device and other parts.

The invention is based on the object of creating an arrangement of these parts, the healing device and the conveying device for the original document.

To solve this problem, the invention consists in that a heating device for the drum is provided with two coils on which a leg cloth runs, that a Rollt sun resilient pressing of the cleaning cloth is arranged movably on the drum, and that a hand-operated device for moving dee Cleaning cloth is provided, which is also used to operate the main switch.

Further advantages and details of the invention result from the following description of an exemplary embodiment with reference to the drawing. In this show:

Fig. 1 is a side view of the device;

Fig. 2

and ti parts of the cleaning device.

Fig. 1 and

3 shows a side view of the device according to FIG. 1, but from the opposite one Side off.

Fig. 1 shows the device with a heating device 35 with an associated branch 57b of the air line of a fan 27 _f, whereby a branch 57a of the line leads into the area of a lamp L for irradiating an original document, which the device via a conveyor table 13 and an in Fig. 1 not illustrated opening in

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a front wall 11 is fed. The arrangement of the valve 58 and the branch 57b and that of a solenoid 52 for controlling these parts as well as a conveying device for the original document to be copied with the rollers 15 to 20 is described in the aforementioned application. It is therefore not necessary to repeat the detailed description that is already contained in the application mentioned! and the same reference numbers are used for the same parts as in the present application.

When an original to be copied is placed in the apparatus from the conveyor table 13, it is scanned by the lamp L and moved by the conveyor by means of a fixed optical device 70, which is illustrated with lines in Fig. 1 and an image of the document a drum 71 of the device throws, which rotates in the self-winding sense, sees Flg. 1. In a known manner, the rotation of the drum 71 and the loading

Movement of the original generated by a main drive of the apparatus and adjusted so that the original document is progressively scanned, with none Relative movement occurs between the image and the drum surface onto which the image is thrown.

The drum 71 is provided with a light-intensive electrostatographic surface, which by means of a first corona discharge device 29, see the device above and to the left hand of the drum 71, is electrostatically discharged before the optical image is projected. The projection is then activated, see above that the bright parts of the image are discharged, so that an electrostatic permanent image of the original document is produced on the drum surface; As the drum rotates, the permanent image is developed by flowing a developer unit 72 over it. Such a suitable developer unit is already described in a previous application, see German patent application L 53759 IXa / 57 «, ii # h · in particular Fig. 4 of the aforementioned German patent

• 09101/1271 ^

Sign up. This developing unit comprises a dye device, indicated by 73 in the present application documents, and one by a solenoid controlled closure, which in the present application documents and in the above-mentioned application with the Reference numeral 51 is provided.

Continued rotation of the drum 71 brings the developed image to a transfer station where it is by means of a second corona discharge device 29 from the Drum surface conveyed onto a sheet of copy paper at the right moment so that the image on the drum is correctly registered from a stack of copy paper on the drum by means of a copy paper conveyor 74 and a copy paper transport device 75. The copy paper is stripped from the drum together with the developed transferred image and onto a chute 32 to the Clamps between a driven roller 33 and a pair of rollers 34 are conveyed into the healing device 32, the is described in the aforementioned application.

900861 /

After the image has been removed from the drum surface, it goes through a cleaning station before it is returned to the first corona discharge device for recharging.

In this cleaning station, the drum surface is now subjected to the action of a cleaning device generally designated 76, which is illustrated in German patent application L 52295 IXa / 57c, How 1 of the present documents, this cleaning device 76 consists of ewei coils 77 and 78, which are arranged on the shafts 79 and 80 and rotate freely with the cleaning cloth 81 running on the bobbin 77 and gradually being taken up on the bobbin 78. Ss a pressure roller 82 of the device is also arranged on a shaft S3 revolving with this, the shaft & 3 being arranged displaceably by the holder 64 in order to move the roller 82 into the illustrated position in which the clamps 82 of the fabric 81 rest against the surface of the drum 71 or assume a separate position in which they

eo8ni / UTi - _eAD

are acted upon by the springs L 5 and in which the .Cleaning takes place between the roller ^ 2 and the drum 71, so that the cloth ■: 1 is released. As illustrated in Figure 2, there is shaft 79 on the side wall ^ 6 behind de ti coils 77 and 7- attached. The spindles ..0 and u3, on the other hand, are driven shafts that protrude through openings in the side wall 66. On the Spindle 79 is a friction clutch with two semicircular Parts 87 and ÖC arranged, see also FIG. 2A, the shaft 79 rubbing together enclose, leaving a small gap between iten. In addition, they are sheathed by means of Helical springs 65 pressed against one another, and the gap is arranged in a recess on the circumference. the both parts 67 and b8 show two openings 90, and

a

in one of these four openings, the coil 77 engages superior S ^ ift _v 91 is thus held against rotation relative to the stationary shaft resiliently 79th The coil 7ö is provided with a similar pin 92, which engages with a similar friction clutch 93 which, therefore, the coil 7 & resiliently connected for rotation with the reasonable • 01881/1271

⁸⁴⁰ "

driven spindle 60 is applied.

As soon as the main drive of the device rotates the shaft o3 (which is described further below and only appears while the roller 82 is in its illustrated position) the hollow o2 rotates slowly, taking the part of the cloth bit is believed the e wipe the rolls and the Tromiiel 71 is clamped so that the at Troamelf laugh ZVT * * · Jce examples nigung abutting part dee cloth 'is constantly gevechaelt. Here, the spool 77 rotates slowly against the action of the coupling between the spool and the shaft 79, and the cloth moved by the boll 82 is picked up by the rotation of the spool 78, so that the coupling 93 rotates the drive shaft 80 . When the yarn woven fabric 81 is removed from the bobbin 77, the used fabric and the two bobbins are dismantled and a fresh fabric is replaced by new bobbin bits. To facilitate replacement, the ends of the Welltn 79 and 80, dit τοη dtr side wall 86 are removed in forks 94 and 95

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held, see Fig. 1, the b * ei 96 and 97 hinge-like arranged so that they can be swung away so that the ends of the shafts come free for the purpose of dismantling the coils 77 and 7o. In doing so , the cloth 81 is free to slide in the distance between the drum 71 and the roller 72 in this position.

As described in the aforementioned patent application, the main drive of the device is formed by an electric motor 26 which drives a chain wheel 100 illustrated in FIG. 3 via a gear drive. This sprocket 100 in turn serves to drive an endless chain 101 which transmits the drive to the various parts of the device. Venn nan of the chain 101 follows in its drive direction, whereby it is is generally a clockwise rotation as in FIG. 3, is shown as £ they 103t under a prestressed sprocket 102 around an idler gear guided over a driven sprocket for Bolle 15 is. (This is one of the numerous reference areas that are used here, about parts su beeichnen, 909881/1) 71

bath

which are used in detail in the patent application mentioned.) The chain is now placed further around the sprocket 104, which is connected to the pulley 49 via gears, and continues under a free-running sprocket 105, under a driven sprocket for the roller 33 _t is placed over the tension-adjustable chain wheel 106, is passed further over the driven chain wheel 107 for the copy paper conveying device, under a driven chain wheel for one of the bollard pairs 108 and 109 of the copy paper transport device and wraps around a chain wheel 110, which is connected to a rotating sieve by means of bevel gears the developer unit 72 is in drive connection. Further, the chain wraps around a sprocket 111 for the Farbetoff-comple "ungseinheit 73, is guided around a Had 112, which is connected via gears to the drum 71 in conjunction, wraps around a bath 113" on dae reference still is made later, übegfcin goes bad 114, which is attached to the shaft 80 of the cleaning device, wraps around a bath for the groove 16 and finally leads to the sprocket 100 surfiokgt ·

BATH ORIGINAL

Switching on the motor 26 causes an immediate drive of the drum 71, the transport device for the original document (rollers 15 and 16), the copy paper transport device (Rollers 108 and 109, 33 and 34 and rollers 49 and 50), of the rotating elevator the developer unit (sprocket 110) and the shaft öO of the cleaning device 76. This is also the drive for the sprockets 107 (for the copy paper conveyor), 111 (for the dye replenishment unit) and 113 set in motion.

The sprocket 107 is connected to the copy paper conveying device via an unillustrated magnetic coupling connected, which is pressed briefly at the right moment, so that a sheet of copy paper from the stack of Copy paper transport device, in particular the revolving rollers 100 and 109, which the Take up the cape sheet between you. An actuation of the Copy paper feeding mechanism is effected by engaging the magnetic clutch, and this in turn is achieved by the MagBet coupling with the guides 31

900881/127 $ \ - ..

is provided according to Fig. 3 of the aforementioned application.

Similarly, the gear 111 is connected to the dye off device 73 via a second magnetic coupling, not shown, the mifden lines 55 in Fig. 3 of the aforementioned application in connection, so that the excitation at the right moment he follows.

The chain wheel 113 provides the drive for the shaft 83 and the shaft 82 of the friction device 76 and for a mechanical time switch which is equivalent to the time switch according to FIG . 3 of the application mentioned and controls the switch HS 6 according to this figure. As can be seen from FIG. 3 of the present drawing, the chain wheel 113 is connected via conical toothing rfider 115 ait dtr WiUt

116 connected, in turn via a magnetic coupling

117 is connected to a shaft 118 on which

a worm wheel 120 is arranged. Sine Sohneoct 119

with ^y -

is the worm wheel 120 "wake up rotation of the cure?" * disc 121 la engagement, which with dam switch HS 6

cooperates, which is described in the mentioned application. "The magnetic coupling U7 is connected to the lines according to the mentioned application, and it is now clear that as soon as the switch MS 5 closes, the coupling 117 is energized and the drive of the Sprocket 113 transmits to the cam disk 123, which begins to rotate and thus first closes the switch MS 6 and then keeps it closed (so that the clutch 117 remains energized), until the cam disk has performed a third of its rotation, whereupon the switch MS 6 opens and the clutch 117 becomes etroelo. Thus, the cam disk and its drive form an equivalent for the time release 55 of the above-mentioned application .Advantage appear that the movement of the roller 82 between the in Fig. 3 and the retracted position is not possible by the engagement of the worm wheel 122 with dtr Schn corner 119 hinders itt, but only tint gtvistt causes rotation of dtr Bolle 82 when the worm wheel 122 on dtr SehMeke-119 ·

runs and that as a result of the fixed position of the Holle 82 (in particular fixed in the illustrated position), the drive is transmitted from the sprocket 113 to the pulley 62 when the clutch 117 is on.

A movement of hell o2 between the withdrawn and the illustrated position is achieved by manual operation at the same time as the main switch 25 of the machine is switched on. The rear ends of the adjustable brackets 84 are as follower rollers designed to interact with the cam disks 125 on a shaft 126 sub revolution of the same. As can be seen from FIG. 1, the cams 125, one of which is illustrated, are shown in FIG withdrawn from Holle c2 in their corresponding position illustrated and it becomes advantageous in practice be, last at the curve arrows 125 in the illustrated Position the springs ο the Holle 62 through one movement of the brackets 64 retract to the Bring rollers with the cams in contact. A clockwise rotation of the shaft 126 according to FIG

8098 $ 1 / 12Tt ""

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from its illustrated position defined by a stop 127 to a position in which the stop is held by a lug 125 * on the curve 125, the holder o4 moves into its illustrated position, the last part of this movement over a Delay part of the curve takes place. The shaft 126 is provided with an unillustrated button to perform this movement by manual operation. The shaft also carries a two curve 12b which cooperates with the main switch 25 of the device, which is a microswitch in the manner illustrated. The curve 12b shows a rising part 12c ¹ , and the switch 25 is set up to close under the action of this part 12Θ ¹ at a time when the cover 82 has already reached the illustrated position and the rear ends of the brackets .4 are already open the deceleration parts of the curves 125. Therefore, the machine is not switched on until the cloth 81 is safely and positively brought to the drum 71 in its cleaning position. The switch 25 remains closed when the shaft 126 is in the opposite 909881/1271

clockwise sense is rotated until the curves 125 and 12c are already in their illustrated position, so that the device turns off the main drive (and the drum 71 continues to rotate) until the Roller 82 allows the springs 85 to retract and thus release the sheet 81 from the drum 71 Has. It is thus ensured that the cloth 81 is never pressed against the drum during this is stationary, which could damage the drum surface.

The cam 128 is formed with a protruding arm 129 which, when moved into the illustrated position, rests against an arm 130 which is arranged on a shaft 131 in order to rotate the shaft 131 in the counterclockwise direction. This shaft 131 carries a feeler 132, and when the device is switched on and the arm 130 is released by the arm 129, the shaft 131 rotates clockwise until the feeler 132 contacts the cloth 81 which is still rolled up on the spool 77 remain. It is clear that the degree of rotation of the "09881 / UTI · '

Wave 131 becomes larger when the bobbin 77 has almost run out, and it is necessary to replace the bobbins 77 and 76 and the fabric 81. As in Fi &. 3, the shaft 132 shows a lever 134 rotating with it, which is biased by a spring 135 so that the sensor 132 is urged in the counterclockwise direction, as is illustrated in FIG Clockwise rotation is illustrated, with the engagement bit being carried out on the fabric 81 on the spool 77. The lever 134 is formed with a curved slot 136 into which a pin 137 protrudes from a disc 138 which is freely rotatably mounted on a pivot pin 139. In its illustrated position, this release disk 138 holds an impact lever 140 which is arranged freely rotatable about a pivot pin 141 in its illustrated position and out of engagement with a warning bell 142. As long as there is a supply of tissue 81 on the spool 77, the slot 136 is long enough to accommodate the movements of the shaft 131 when the device is turned on or off without the pin 137 and

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the release bar 13 <~ are disturbed. When the coil 77 but is empty or nearly empty, the counterclockwise rotation of the shaft 131, see Fig. 3, when the device is switched on, sufficient to bring the clockwise end of the slot 136 in engagement with the pin 137 and hence to rotate the release disk 13-3 sufficiently clockwise so that the hammer 140 is released so that the head 143 can hit the warning bell 142. The rear end 144 of the hammer 140 runs in the released position over teeth of a bath 145, which is arranged to rotate with the sprocket 100, uncjhierby the hammer rotates under its own weight and the rotation of the gear 145 back and forth and strikes repeatedly against the Bell 142 sub for the purpose of warning that the cleaning cloth 81 has leaked and should be replaced. When the device is switched off, the clockwise rotation of the lever 134 causes the counterclockwise direction of the indt of the slot 136 to engage the pin 137 and to return the disk 138 and the hammer lever 140 to the position shown. but

ΒΛΟΟ »

the bell will of course start ringing again when the device is next restarted, without a full spool 77 having been inserted in the meantime.

At this point it should be mentioned that although the cloth 81 is made of a woven fabric of spun threads can, as mentioned in the aforementioned German patent application L 52295 IXa / 57c, it is also possible that this cloth is not a soft one Paper web can act, similar to paper, as it is used today, among other things, for the production of handkerchiefs finds. In addition, this web, regardless of whether it is a fabric, paper or other material, be sufficiently impregnated in an advantageous manner with a suitable liquid such as oil that the Drum surface is provided with a thin film of liquid in addition to the cleaning agent.

In the following, the already mentioned copy paper 'conveying device 74 is described in more detail with reference to FIG.

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be practiced. It shows a pair of arms 150 freely rotatably disposed on shaft 153 near the outer ends, with two disposed on rollers 152 Rubber-coated cones 154 are arranged by means of a freewheel, the rotation in the counterclockwise sense allowed. Approximately in its middle, the shaft 152 shows a drive sprocket, which also has a sprocket of shaft 152 is wrapped therewith for rotation, and shaft 152 is coupled to sprocket 107 by a magnetic coupling, which is not shown, but which has already been mentioned in connection with the sprocket 107. When this clutch is engaged, the shafts 152 and 153 are rotated counterclockwise, see Fig. 1, as well as the rollers 154, resting on the top sheet of the copy paper stack, and convey the top sheet as it rotates so that the guide edge Transport device is guided and sviaohen the Rolls 106 and 109 is brought. The copy paper loading device only works for a short time, but when the drive is switched off by switching off the lugtordnettn detention

809111/1271 · 'b? .D ok ^ JJL

Net coupling is interrupted, the rollers 154 are free to overrun the shaft 153 while the top sheet is further withdrawn from the stack by rollers 108 and 109. The stack of copy paper is in one removable table 156 arranged, of which only one End is illustrated in a partially retracted position and this table is lined with cam blocks 157 provided, which cooperate with lever arms 153, which are arranged on the side walls of the machine and for clockwise rotation in the illustrated * Position in which they rest against the outer lugs 159 of the rod 151 and lift the copy paper conveying device into the teranscfaaulicht position, which is the rest position. In this rest position, the rollers 154 are raised from the stack on the table, so that the table can now be pushed fully to the right without interference from the roller 154 entered then the curve blocks 15? with levers 15β come into singriff and turned counterclockwise thereby releasing the copy paper feed line to allow the pods 154 on the top sheet • 0IM1 / 12T1

Copy paper come to the cows.

The shaft 126 equipped with a button for manual operation is provided with a radially projecting pin 160 which is mostly covered by the button. The pin 160 cooperates with a not illustrated part of the outer cover of the device, which is designed in a hinge-like manner at its lower edge, so that access to the cleaning device is created in which the arms 94 and 95 can swing outwards and the coils 77 and To as well as the cloth ü1 are interchangeable. This hinge-like cover part shows a circular opening through which the end of the shaft 126 protrudes when the part is in its cover position to receive the button, and the circular opening is widened to a fiadial slot so that the cover part only downwards can be swung with the pin 160 aligned with the slot, that is, in its illustrated position in which the device is turned off. To prevent the device from accidentally

909-1 / 12-1

is turned on by rotating the shaft 126 while pivoting the cover part downwards is, the arm 129 is formed with an opening 161 into which a pin arranged with a leaf spring 162 is pressed by means of the spring. When the aperture 161 engages the pin, rotation is the Shaft 126 prevented. The covering part has an inward-facing approach, which in the real action on the spring 162 is applied and prevents the pin from entering the opening 161.

Although the fan 27 in the aforementioned application as provided with a separate drive has been described, and thus not by the main drive motor 26, it can be useful to drive him in this way. In an advantageous embodiment According to the invention, the motor 26 drives the sprocket 100 through a reduction gear and is in addition mechanically with the fan 27 via a transmission gear coupled that then no separate drive motor shows.

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It can be seen from Fig. 3 that the side wall 86 of the device is provided with an opening 165 for the escape of the air guided to the heating device 35 by means of the fan 27 via the line 57b, the lower end of which is opened inwardly through the opposite side wall is. In addition, this opening 165 shows an access to the heating elements 41 of the heating device, so that these can be exchanged if necessary without dismantling other parts of the device apart from the cover. As mentioned, the cover is partially designed in the manner of a hinge. If a sheet of copy paper gets wrongly into the heating device, the lower part with the support plate 38 over which the paper slides and the reinforcing rods 42 and the insulation 44, see the aforementioned German patent application, can also be dismantled. For this purpose, the boll 50 can be pulled obliquely downwards after it has been pulled from the table, which is normally arranged below the heating device , so that the lower part of the heating device can be pulled forward between the roller 49 and the hoI-

90 9 8 81/1271. ₆ ad original

can be removed when it is dismantled.

The rollers 15 and 16 and a conveyor belt 14 looped around them are furthermore arranged as a detachable unit which is provided with a carriage 166 which engages in sliding guides 167 in the side walls of the device. In addition, this Unit can now be pulled forward after the drive chain 101 tone the sprockets of the itollen 15 and 16 are removed.

Further units of the device can also be dismantled separately in a simple manner. The dismantling and the replacement of the cleaning bobbins 77 and 7 & as well as the cloth 81 has already been described, the side wall having an opening 16c for this purpose on the side opposite the wall b6 is designed, see FIG. 1. The developer unit can be pulled backwards τοη the drum 71 withdrawn and the dye refill information 73 is either before or after the developer unit

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separable after dismantling. The optical device 70 can be lifted upwards as a unit, whereby the motor 26, the fan 27 and the high-voltage source 169, which is provided for the corona discharge devices, are accessible for the purpose of dismantling these parts if necessary. The corona discharge device 29 itself can be dismantled through one of the side walls as well as through the other. There-. after the Tronael 71 can backwards and upwards

in the

can be pulled out so that its shaft can be drawn along slots 170 formed in the side walls and is generally closed off by plates 171 which are detachably attached to the side walls.

The lamp L for irradiating the original document can be removed and replaced by first a Heflektoranordnung 172, see FIG. 1, is pulled between the side plates, on this reflector 172 is a large part of the electrical switching device of the machine combined in a unit 173

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BATH OR ^{1 GiNAl}

35?

where it is easily accessible and can be easily dismantled if necessary, see the Beiais R1 and R2, the transformers T1 and T2 _f, the rectifiers 30 and 54 and the signal lamp 62, which is already described in the application mentioned.

All of the details described and illustrated are relevant to the invention.

Claims;

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Claims (10)

i «? Claims 1. Developing device with an electrostatographic Drum, the drive of which can be controlled by a main switch, characterized in that that a cleaning device (76) for the drum (71) with two coils (77,78) is provided is on which a cleaning cloth (81) runs that a roller (82) for resiliently pressing the Cleaning cloth arranged movably on the drum is and that a hand-operated device is provided for moving the roller, which is also the actuation the main switch (25) is used. , 2. Device according to claim 1, characterized in that the pressure roller (82) is arranged at its front ends in a slidable holder (84), that the rear ends are provided with a first cam follower roller (82), —- i> BAD ORJGiNAL 909881/1271 wherein the hand-operated device comprises a shaft (126) with cams (125) for actuating the rollers. 3. Device according to claim 2, characterized in that that the shaft ($ 12) has a further curve (128) that the main switch (25) is provided with a second cam (121) and an associated cam roller, the first Curves are provided with constant parts that allow further rotation of the shaft with the bolts in the front position allows, and that the main switch by a further curve with the further rotation of the Shaft can be actuated. 4. Device according to one of claims 1 to 3 _f d adurch that the target (& 2) is provided with a worm wheel (122) and with a worm (119) i »engages, in addition a magnetic coupling (117) with one shows the main drive connected input side and that . the output side is connected to the screw, where- drivable by the Bolle by the main drive is when the magnetic clutch is switched on. 5. Establishment according to claim 4, characterized g e flagz.e Inet that a second worm wheel (120) is in engagement with the worm (119), with the cam disk attached to the worm wheel for rotation and a holding switch attached to a Actuator rests on the cam, the switch (MS 6) in series with the magnetic coupling (117) is switched, whereby after energizing the magnetic clutch, the cam disc is the Switch operated so that the magnetic coupling remains energized until the cam and the cam turn have turned a starring path over the profile of the cam. 6. Device according to claim 2 or one of the preceding claims 3 to 5, characterized in that that the main drive with a coach clutch to drive one of the coils 909881/1271 BAD ORiQiNAL (77) is provided for winding the fabric (81), and that the other of the two coils (78) is resilient against rotation is maintained and wherein a feeler (132) is resiliently in contact with the tissue the other coil is held while an arm (129) is arranged on the shaft and the feeler outside a contact holds when the position of the shaft is such that the first curves and the second Curves of the roller (82) and the main switch (25) allow the rear rest position to be assumed. 7. Apparatus according to claim 6, characterized in that an alarm bell (142) sewie a cooperating hammer lever are provided, the end of which can be driven with a gear (145) via the main drive and is in engagement with the second end, whereby the first end repeats the alarm bell abuts, wherein a triggering device is between two layers Move bar in which the free ends cooperating with the bell and the gear, while an idling 909081 / 12t1 YES link between the feeler and the performance for the purpose of Movement to the second position is arranged when the feeler is out of contact with the cloth (81) the bobbin has moved out. 8. Device according to one of claims 1 Us 7 »characterized in that two parallel shafts (126, 131) with the two arranged coils (77,7S) are provided, each Shaft is fixedly mounted at one end and at the other end an arm (29,30) for engagement with the respective shaft is arranged, whereby the two coils can be withdrawn from the shaft ends. 9. Device according to claims 2 and 5, characterized in that a removable cover plate is provided for covering the Sttttsa.ni · (29,30), which has an opening (161) for the shaft to pass through, the bit of a radial attachment (159) outside the cover plate Ttriehen BATH 909881/1271 3H is, wherein the opening has an expansion in the Uafangsrichtung through which an outward movement of the plate through the approach in only a rotational position of the shaft is made possible. 10. The device according to claim 9, characterized in that a locking device for engagement with the shaft (133) in one Rotational position to prevent rotation is provided that the device on the cover plate ait the Locking device is engageable and prevents engagement as long as the cover plate is moved outwards. 909181/1271.