EP0624118B1 - Divice for grinding a cylindrical surface, especially a roller of a paper machine - Google Patents

Abstract

PCT No. PCT/CH93/00248 Sec. 371 Date Jul. 21, 1994 Sec. 102(e) Date Jul. 21, 1994 PCT Filed Oct. 20, 1993 PCT Pub. No. WO94/12315 PCT Pub. Date Jun. 9, 1994A device for grinding a cylinder surface is provided, the cylinder being one of at least three substantially parallel, axially offset cylinders. The device includes a central body member and at least three supporting elements, each of the supporting elements being associated with a corresponding one of the cylinders, the supporting elements supporting the central body member relative to the cylinders. One or more belt grinder assemblies are provided, each belt grinder assembly including a belt grinder and a device for mounting the belt grinder on the central body member. Each belt grinder includes a contact wheel, an abrasive belt, extending around the contact wheel, and a device for supporting the contact wheel relative to a one of the cylinders to be ground. The supporting device includes a device for adjusting a position of the contact wheel relative to the one of the cylinders to be ground.

Description

The invention relates to a device for grinding a cylinder surface, in particular a roller of a paper machine, according to the preamble of claim 1 (see, for example, WO-A-87 02281).

Devices of the type mentioned at the outset are known several times, for example from EP-OS 0 359 304. The disadvantage here is that this grinding device requires a special carrier which must be arranged along the cylinder surface in each case before a grinding process in order to move the belt grinder along the To guide the cylinder surface. It is therefore not possible to use such a grinding device between several closely spaced cylinder surfaces; the corresponding cylinders must be removed for a grinding process.

The object of the invention is to design a grinding device of the type mentioned at the outset in such a way that it can be used between closely spaced cylinders.

The object is achieved according to the invention by the characterizing features of claim 1.

Because the frame has three pairs of star-shaped support members that contain foot parts that can be moved on a base, the frame can be narrow are inserted at adjacent cylinders and are supported on the cylinder surfaces of the cylinders, so that no additional support is required. The belt grinder has a support arm, which is preferably pivotably arranged on the frame and carries a bearing block for the contact disk, which can be attached to a cylinder surface to be ground. The necessary contact pressure as well as the spacing is ensured by a support device which is arranged between the bearing block and a base, ie a cylinder. With the help of the grinding device, a cylinder surface can be ground from closely spaced cylinders without having to be removed.

Advantageous embodiments of the grinding device are described in claims 2 to 19.

An embodiment according to claim 2 is particularly advantageous, as a result of which the frame can be adjusted to the respective distances between the cylinders.

A wide variety of drive types are possible for moving the frame and thus the grinding device along the cylinder surface. For example, a drive device can be provided at the ends of the cylinders, which moves the frame along the cylinder surface by means of a pulling element or a drive spindle. However, an embodiment according to claim 3 is particularly advantageous.

The feet of the support members can have rollers or balls, by means of which they are supported on a base, ie a cylinder surface. However, a configuration according to claim 4 is particularly advantageous, which not only ensures a particularly smooth, vibration-free run, but also the lowest frictional resistance offers and in particular allows that movement in different directions is possible. The frame can thus be moved along a stationary as well as a rotating cylinder surface.

A particularly simple attachment of the bearing block to the support arm describes claim 5. It is particularly advantageous if the bearing block is pivotally connected to the support arm according to claim 6, whereby the alignment of the contact disk on the cylinder surface to be ground is facilitated. The cardanic suspension of the contact disk according to claim 7 is particularly advantageous. However, a floating mounting of the axis of the contact disk is also possible.

There are various possibilities for the formation of the delivery device. For example, this can be integrated in the support device between the bearing block and a base. In the simplest case, the support device can be supported directly on the base by means of a roller or, according to claim 12, on a guide ruler connected to the base to improve the guidance. An advantageous delivery device is described in claim 9. A configuration according to claim 10 and in particular in a further development according to claim 11 is more advantageous.

A further development of the grinding device according to claim 12 is also particularly advantageous in order to ensure an exact alignment and guidance of the contact disk on the cylinder surface to be ground, regardless of the quality of the base. Claim 13 describes a particularly simple and effective possibility of fastening the base device to the base, in particular to the cylinder surface of an adjacent cylinder. A training according to claim 14 of Advantage. This can compensate for unevenness on the base used as a support. The embodiment according to claim 15 provides a reference variable for aligning the guide ruler. Claim 16 describes a particularly expedient type of arrangement and possibility of tensioning the steel wire. The development according to claim 17 makes it possible to determine the radial orientation of the guide device with respect to the base and the surface to be ground, which is given when both sensors indicate the same value. The setting itself is made by rotating the pad.

To control the position of the contact disk on the surface to be ground, a further development of the grinding device according to claim 18 is advantageous. With the help of the sensors, an exact radial alignment of the contact disk on the cylinder can be determined.

The arrangement of the drive motor according to claim 19 is particularly space-saving and enables a very compact design of the device.

Figur 1

eine erste Anordnung der Schleifvorrichtung zwischen drei Zylindern, in Ansicht quer zur Verfahrrichtung;

Figur 2

eine zweite Anordnung der Schleifvorrichtung zwischen drei Zylindern, in Ansicht quer zur Verfahrrichtung;

Figur 3

die Schleifvorrichtung im Schnitt III-III der Figur 1;

Figur 4

die Kontaktscheibe mit der Stützvorrichtung in Ansicht IV-IV der Figur 1;

Figur 5

die Anordnung gemäss Figur 4 in minimalstem Abstand der Kontaktrolle vom Sockel;

Figur 6

die Stützvorrichtung in der Ansicht VI-VI der Figur 1;

Figur 7

die Stützvorrichtung der Figur 6 im Schnitt VII-VII der Figur 6;

Figur 8

den Sockel der Stützvorrichtung in Ansicht quer zur Verschieberichtung; und

Figur 9

die Stützvorrichtung der Figur 6 im Schnitt IX-IX;

Figur 10

eine Vorrichtung zum Anordnen und Spannen von Stahlseilen, im Grundriss;

Figur 11

die Vorrichtung der Figur 10 im Schnitt XI-XI der Figur 10;

Figur 12

die Anordnung einer weiteren vereinfachten Schleifvorrichtung zwischen drei Zylindern, in Ansicht quer zur Verfahrrichtung;

Figur 13

die Schleifvorrichtung der Figur 12 im Schnitt XIII-XIII der Figur 12; und

Figur 14

die Anordnung gemäss Figur 13 in Ansicht XIV-XIV der Figur 12.

Exemplary embodiments of the grinding device according to the invention are described in more detail below with reference to the drawings, in which:

Figure 1

a first arrangement of the grinding device between three cylinders, in view transverse to the direction of travel;

Figure 2

a second arrangement of the grinding device between three cylinders, in view transverse to the direction of travel;

Figure 3

the grinding device in section III-III of Figure 1;

Figure 4

the contact plate with the support device in view IV-IV of Figure 1;

Figure 5

the arrangement according to Figure 4 at a minimum distance of the contact roller from the base;

Figure 6

the support device in the view VI-VI of Figure 1;

Figure 7

the support device of Figure 6 in section VII-VII of Figure 6;

Figure 8

the base of the support device in a view transverse to the direction of displacement; and

Figure 9

the support device of Figure 6 in section IX-IX;

Figure 10

a device for arranging and tensioning steel cables, in plan;

Figure 11

the device of Figure 10 in section XI-XI of Figure 10;

Figure 12

the arrangement of a further simplified grinding device between three cylinders, in view transverse to the direction of travel;

Figure 13

the grinding device of Figure 12 in section XIII-XIII of Figure 12; and

Figure 14

the arrangement according to Figure 13 in view XIV-XIV of Figure 12.

Figures 1 and 2 show the overall view of a grinding device in different positions on three cylinders Z₁, Z₂, Z₃, the axes of which form the corners A, B, C of a triangle, the cylinder surfaces having a mutual radial distance X₁, X₂, X₃ of different sizes . The cylinders can in particular be rollers of a paper machine.

The grinding device contains a frame 2 with a central body 4, on which two three support members 6₁, 6₂, 6₃ are arranged in pairs and in a star shape, which are supported by foot parts 8₁, 8₂ on a base, ie the cylinders Z₁, Z₂, Z₃. The foot parts 8 1 are formed as pillows 10, which have air outlet openings 12 for the discharge of compressed air against the cylinder surface, in order to form an air cushion there. On the support member 6 ₁ 2 foot parts 8 ₁ are pivotally arranged on a crossbar 16 and 16 adjustable in position by means of screws 18. The support member 6₂ has an adjustable foot part 8₁ via a screw 20. The support member 6₃ is designed as a drive device and has a foot part 8₂, which is designed as an impeller driven by a drive motor 22. The impeller 8₂ cooperates with the surface of the cylinder Z₁ and serves to move the grinding device along the cylinder, parallel to the axis thereof. Each support member 6₁, 6₂, 6₃ contains interchangeable spacers 23 to the support members on the respective Distance X₁, X₂, X₃ to be able to adjust the cylinder surfaces.

At least one belt grinder 24 is preferably arranged on the frame 2, two belt grinders 24 1, 24 2, each of which contains a support arm 26 articulated on the central body 4, which supports a bearing block 28 for a contact disk 30 and a deflection roller 32 with a tensioning device 34. The drive motor 35 of the belt grinder 24 is accommodated in the central body 4 and drives the grinding belt 36 guided over the contact disk 30 and the deflection roller 32.

A support device 38 is arranged between the bearing block 28 and the cylinder Z 1 serving as a base. This contains with the cylinder Z₁ connectable base devices 40 which carry a guide ruler 42 which contains a guide rail 44 on which a guide carriage 46 can be moved. The guide carriage 46 is connected to the bearing block 28 of the contact disk 30 via a spacer 48. The spacer 48 is interchangeable with such other dimensions, so that the length of the support device on the distance X₁, X₂, X₃ of the cylinder surfaces is adjustable, as a comparison of the arrangements according to Figures 1 and 2 and 4 and 5 shows. The axis 50 of the support device is aligned coaxially to the radial jet 52, which connects the axes of the cylinders Z₁, Z₂.

Figures 3 to 5 show further details of the design of the belt sander. From Figure 3 it can be seen that the grinding device has two belt grinders 24₁, 24₂, which are of identical design and are arranged in mirror image. In the central body 4 of the frame 2, the drive motor 35 is arranged, which drives the grinding belt 36 by means of a drive disk 54, which over the contact disk 30 and the deflection roller 32 is guided. The deflection roller 32 is connected to the support arm 26 via an indicated tensioning device 34 and via a corresponding clamping device 56. The deflection roller 32 is mounted in a fork guide 58 and can be preloaded by means of a piston / cylinder unit 60.

The bearing block 28 carrying the contact disk 30 contains an infeed device 62 for feeding and / or adjusting the contact disk to the cylinder surface to be ground. For this purpose, the axis 64 of the contact disk 30 is fastened to a slide 66 which can be moved on a slide guide 68 of the bearing block 28. An adjusting spindle 74, which is driven by a drive motor 70 via a belt drive 72, interacts with the slide 66 and serves for the controlled adjustment thereof. The bearing block 28 is connected on the one hand via a joint 76 to a clamping device 78 which holds the bearing block 28 on the support arm 26. With the help of the joint 76, the bearing block can be pivoted about an axis 80 which runs parallel to the axis of the contact disk 30. The bearing block 28 is further fastened to the spacer 48 of the support device 38 and is thus further supported on the guide carriage 46 of the guide rail 44 of the guide ruler 42, as already mentioned above. Sensors 82 are arranged on both sides of the slide 66 and cover the surface of the base, i.e. scan the cylinder Z₂, and by means of which the radial alignment of the guide device to the radial jet 52 can be determined. This radial alignment is given when both sensors 82 display the same value.

FIG. 5 shows the design of the support device for the smallest possible distance X of the cylinder surfaces, in which case the bearing block 28 is connected directly to the guide slide 46, ie no spacer 48 is used.

Further details of the support device are shown in FIGS. 6 to 9. The base device 40 contains a base plate 84 to which four magnetic feet 86 are fastened. These contain permanent magnets, not shown, which can be switched from an inactive position to an active position by means of a switch 88, in which the magnetic feet 86 adhere to the base, ie the cylinder surface. Via a height adjustment device 90, a support plate 92 is adjustably connected to the base plate 84, to which the guide ruler 42 is attached. The height adjustment device 90 contains a wedge 94 which is connected to a servomotor 98 via a threaded spindle 96. The wedge 94 cooperates with an inclined surface 100 on the base plate 84. By actuating the servomotor 98, the wedge 94 can be displaced along the inclined surface 100 and thereby adjust the support plate 92 in the height direction. The position of the wedge 94 can be determined by means of a dial gauge 102, so that the height or a change thereof can be read taking into account the incline. As already mentioned above, the guide ruler 42, which carries the guide rail 44, is fastened to the carrier plate 92. The latter has a rail head 104 with a preferably circular cross section. The mentioned guide carriage 46 can be moved on the guide rail 44. On the guide carriage 46, measuring sensors 106 are arranged on both sides of the guide rail 44, which cooperate with the guide ruler 42 and determine whether the guide carriage 46 is aligned correctly, ie perpendicular to the guide ruler 42, about the axis of the rail head 104. This makes it possible by rotating the cylinder Z₁ to align the bearing block 28 and thus the contact disk 30 around the guide rail 44, preferably in such a way that the support device 38 with its axis 50 perpendicular to the guide ruler 42 and coaxial to the radial jet 52 between the cylinders Z₁ and Z₂ is aligned.

If necessary, the rail head 104 can also have a polygonal cross-section, i.e. prismatic, then an articulated connection must be present in the support device 38, which allows pivoting about an axis which is parallel to the guide rail 44.

Around the guide ruler 42 on a possibly inaccurate base, i.e. Align inaccurate cylinder surface, two parallel steel wires 108 1 and 108 2 running on both sides of the guide rail 44 are tensioned at both ends of the guide ruler, on the basis of which the guide ruler 42 can be aligned. For this purpose, sensors 110 are arranged on both sides of the guide rail 46 on the guide carriage 46, which interact with the steel wires 108 1, 108 2 and measure the distance of the guide carriage 46 from the steel wires 108 1, 108 2. The guide ruler is correctly aligned when the guide carriage 46 is radially aligned in the manner described above and the sensors 110 along the entire displacement path of the guide carriage 46 on the guide rail 44 indicate the same distance from the steel wires 108. If the distance varies, the guide ruler 42 must be adjusted using the height adjustment device 90 until the constant distance is reached over the entire length of the guide ruler 42.

Figures 10 and 11 show a device for arranging the steel wires 108₁, 108₂, which form sections of a continuous steel wire 108, the ends 112₁, 112₂ are fixed to a first holder 114, which in turn is fixedly arranged at one end of the guide rule 42. The steel wire runs along the guide ruler to the other end of the guide ruler 42, on which a second holder 116 is fixed with deflection rollers 118₁, 118₂, 118₃, 118₄. The steel wire 108 is guided around the guide rollers 118₁, 118₂, 118₃, 118₄ and then runs along the guide ruler 42 to the first holder 116 back, where it is guided around a further deflection roller 120 to a measuring device 122, to which the end 112₂ of the steel wire 108 is attached. The measuring device 122 is in turn connected to the first holder 114 via a clamping device 124. The first end 112 1 of the steel wire 108 is firmly clamped on the first holder 114. The tension of the steel wire 108 can now be changed by means of the tensioning device 124, the tension of the steel wire being readable on the dial gauge 122. This allows optimal and always constant clamping conditions on the steel wire 108 and thus its sections 108 1, 108 2 to be set. In the area of the two ends of the guide ruler 42 there are also fixed points 126 on which the steel wire sections 108 1, 108 2 lie and between which the guide ruler 42 is aligned in the manner described above.

Figures 12 to 14 show a further grinding device, which is identical in terms of the arrangement between the cylinders Z₁, Z₂, Z₃ with the grinding device described above, so that the same parts are provided with the same reference numerals. The grinding device in turn contains a frame 2 with a central body 4 on which two three support members 6₁, 6₂, ₃ are arranged in pairs and in a star shape, which are located on base parts 8₁, 8₂ on base, i.e. support the cylinders Z₁, Z₂, Z₃. With regard to further details and the drive for moving the frame 2 along the cylinders, reference is made to the above statements.

At least one belt grinder 128 is in turn arranged on the frame, which contains a support arm 130 articulated on the central body 4, which is no longer free-swinging, but is supported on the central body 4 via a further support arm 132 and thus forms a joint triangle with the first support arm 130. The first support arm 130 carries one Bearing block 134, which is arranged on the support arm 130 by means of an adjustable clamping device, not shown. The axle 138 of the contact disk 140 is mounted in a gimbal suspension 136 on the bearing block 134. The outer frame 142 of the gimbal 136 is connected at one end to the bearing block 134 via a joint 144. At the other end of the frame 142, a feed device 146 of the support device 148 is articulated via a joint 145. The latter contains a rocker arm 150, which on the one hand is pivotally attached to the bearing block 134 via a joint 152 and is connected at the other end to the delivery device 146 via a further joint 154, which can be, for example, a piston / cylinder unit or a motor-driven adjusting spindle. On the rocker arm 150, a bracket 156 is fixed between the joints 152, 154, which carries a roller 158, which cooperates directly with the cylinder Z₁. The connection between the bearing block and the rocker arm 150 is preferably adjustable in length in order to be able to adapt the belt grinding device to cylinders of different distances. Spacers mentioned earlier can serve this purpose or a corresponding adjusting spindle. If necessary, the effective length of the support arm 132 can also be variably connected to the support arm 130 in order to be able to adapt the latter and thus also the bearing block 134 and the associated support device between the cylinders and in particular to be able to align it along the radial jet 52.

As described in the example above, the contact disk 140 is driven by means of a drive motor 35 arranged in the central body 4, the grinding belt 36 being guided over the drive disk 54, the contact disk 140 and the deflection roller 32, the latter in turn being arranged on the support arm 130 by means of a tensioning device 34 is.

With the help of the present grinding devices, it is possible to grind adjacent cylinders in the simplest way without removing the cylinder and with minimal assembly work for the grinding device.

REFERENCE SIGN LIST

A

Corner of a triangle

B

Corner of a triangle

C.

Corner of a triangle

X₁

Distance of the cylinder surface

X₂

Distance of the cylinder surface

X₃

Distance of the cylinder surface

Z₁

cylinder

Z₂

cylinder

Z₃

cylinder

2nd

frame

4th

Central body

6₁

Support member

6₂

Support member

6₃

Support member

8₁

Foot part

8₂

Foot part

10th

pillow

12th

Air outlet opening

14

Crossbar

16

boom

18th

Set screw

20th

Screw spindle

22

Drive motor

23

Spacer

24th

Belt grinder

24₁

Belt grinder

24₂

Belt grinder

26

Beam

28

Bearing block

30th

Contact washer

32

Pulley

34

Jig

35

Drive motor

36

Sanding belt

38

Support device

40

Base device

42

Guide ruler

44

Guide rail

46

Guide carriage

48

Spacer

50

axis

52

Radial

54

Traction sheave

56

Clamping device

58

Fork guide

60

Piston / cylinder unit

62

Delivery device

64

axis

66

carriage

68

Sled guide

70

Drive motor

72

Belt drive

74

Adjusting spindle

76

joint

78

Clamping device

80

axis

82

Sensor

84

Base plate

86

Magenta foot

88

counter

90

Height adjustment device

92

Carrier plate

94

wedge

96

Threaded spindle

98

Servomotor

100

Sloping surface

102

Dial gauge

104

Rail head

106

Sensor

108

Steel wire

108₁

Steel wire section

108₂

Steel wire section

110

Sensor

112₁

End of 108₁

112₂

End of 108₂

114

first holder

116

second holder

118₁

Pulley

118₂

Pulley

118₃

Pulley

118₄

Pulley

120

Pulley

122

Measuring device

124

Jig

126

Fixed point

128

Belt grinder

130

Beam

132

Support arm

134

Bearing block

136

gimbal suspension

138

axis

140

Contact washer

142

frame

144

joint

145

joint

146

Delivery device

148

Support device

150

Rocker arm

152

joint

154

joint

156

Bearing block

158

Roller

Claims (19)

1. Device for grinding the surface of a cylinder, in particular the cylinder of a paper machine, with at least one belt grinder (24, 24₁, 24₂, 128) situated on a frame (2) and able to travel along a surface line on the surface of the cylinder, the belt grinder having contact wheels (30, 140) connected with an infeed mechanism (62, 146), wherein:

   - the frame (2) displays twice three supporting members arranged in pairs in the shape of a star (6₁, 6₂, 6₃) with feet (8₁, 8₂) able to travel on a supporting base (Z₁, Z₂, Z₃),

   - the belt grinder (24, 24₁, 24₂, 128) displays a bracket (26, 130) placed on the frame (2) and which carries a pillow block (28, 134) for the contact wheel (30, 140);

   - there is a support mechanism (38, 148) between the pillow block (28, 134) and a supporting base (Z₁, Z₂, Z₃).
2. Device as claimed in claim 1, wherein the frame (2) displays a central body (4), to which the supporting members (6₁, 6₂, 6₃) are attached, preferably by means of spacers (23) in a manner enabling the length to be adjusted.
3. Device as claimed in claim 1 or claim 2, wherein the supporting foot (8₂) of one supporting member (6₃) takes the form of a roller that can be driven.
4. Device as claimed in claim 1 or 2, wherein the supporting feet (8₁) of at least two pairs of supporting members (6₁, 6₂) take the form of a cushion (10) with air exit orifices (12) directed towards the supporting base in order to form air cushions.
5. Device as claimed in one of the claims 1 to 4, wherein the pillow block (28, 134) is attached in an adjustable manner along the bracket (26, 130), preferably by means of a clamping device (78).
6. Device as claimed in one of the claims 1 to 5, wherein the pillow block (28, 134) is attached to the bracket (26, 130) in a manner enabling it to swivel on an axis (80, 152) aligned parallel to the axis of the contact wheel (30, 140).
7. Device as claimed in one of the claims 1 to 6 wherein the pillow block (134) has a cardanic suspension device (136) for the center arbor (138) of the contact wheel (140).
8. Device as claimed in one of the claims 1 to 7, wherein the support mechanism (148) rests directly on the supporting base (Z₁) by means of a roller (158).
9. Device as claimed in claims 7 and 8, wherein the cardanic suspension (136) is connected on one side by an articulated joint (152) to a pillow block attached to the bracket (130) and at the opposite end has an infeed mechanism (146) which acts in conjunction with the free end of a rocker (150) also attached by a hinge (154) to the pillow block (134), whereby the rocker (150) carries, between the hinge parts, the roller (158) of the support mechanism (148) which rests on the supporting base (Z₁).
10. Device as claimed in one of the claims 1 to 9, wherein the pillow block (28, 134) displays the infeed mechanism (62, 146) for the infeed and/or positioning of the contact wheel (30, 140) relative to the surface of the cylinder (Z₂) to be ground.
11. Device as claimed in claim 10, wherein the center arbor of the contact wheel (30) is attached to a slide (66) of the infeed mechanism (68), whereby the slide (66) travels and/or can be shifted in a slide guide (68) on the pillow block (28) by means of an adjusting spindle which can be driven.
12. Device as claimed in one of the claims 1 to 8, wherein the support mechanism (38) displays plinth devices (40) which can be connected to the supporting base (Z₁, Z₂, Z₃); the said plinth devices (40) carry the common guide rule (42) which contains a guide rail (44) with a rail head (104) having a preferably circular cross-section on which a guide block (46) can travel, which is connected in a manner allowing the length to be adjusted, preferably via a spacer (48), to the pillow block (28) of the contact wheel.
13. Device as claimed in claim 12, wherein the plinth device (40) displays a base plate (84) which can be connected to the supporting base (Z₁, Z₂, Z₃) by means of magnetic feet (86) which can be switched on and off, a bearing plate to receive the guide rule (42) being situated on the base plate (84) by means of a height adjustment mechanism (90).
14. Device as claimed in claim 13, wherein the height adjustment mechanism (90) displays a taper key (94) which is connected to a drive mechanism (96, 98) and which works in conjunction with an inclined surface (100) on the base plate (84) and/or bearing plate (92), whereby a measuring instrument (102), preferably a dial gauge, connected to the taper key (94) serves to determine the change in position of the taper key (94) and hence the change in position of the bearing plate (92).
15. Device as claimed in one of the claims 12 to 14, wherein the said device contains means (108, 108₁, 108₂, 110) to align the guide rule (42), these means being preferably two steel wires (108₁, 108₂) placed on either side of the guide rail (44) and running parallel to the said guide rail (44); the said steel wires (108₁, 108₂) being fixed taut to the ends of the guide rule (42) at reference points (114, 116) and being able to be scanned by sensors (110) positioned on the guide block (46).
16. Device as claimed in claim 15, wherein the steel wires (108₁, 108₂) are formed by sections of a single steel wire (108), the ends of which (112₁, 112₂) are attached to a first stay (114) on a first end of the guide rule (42) and are taken over guide rollers (108₁, 108₂, 108₃, 108₄) to a second stay (116) at the second end of the guide rule (42), whereby furthermore there is a tensioning device (124) for tautening the steel wire (108) and preferably a measuring instrument (122) to measure the tension of the steel wire (108).
17. Device as claimed in one of the claims 12 to 16, wherein sensors are placed on the guide block (46) on either side of the guide rail (44) and act in conjunction with the guide rule.
18. Device as claimed in one of the claims 1 to 16, wherein sensors (82) acting in conjunction with the surface of the cylinder to be ground are placed on either side across the axis or center arbor of the contact wheel (30).
19. Device as claimed in claim 2, wherein the belt grinder (24, 128) displays a drive motor (35) which is situated in the central body (4) of the frame (2).

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