WO2008141614A2 - Pulley of a strip that can be coiled up and uncoiled in a spiralling manner - Google Patents

Abstract

The aim of the invention is to improve a frictional connection of the strip to the lateral disks of the pulley. To achieve this aim, the axially inner distance (d1) between axially inner walls (8, 9) of the lateral disks (5, 6) is larger than the width (d2) of the strip (10; 13) when flat. At least one elastic element (17, 19, 22) is arranged between the axially inner walls (8, 9) of the lateral disks (5, 6) and the outer edges (11, 12) of the strip (10, 13), at least one outer edge (11, 12) of the strip (10, 13) plunging at least partially into the elastic element when the strip is coiled up, and the elastic element (17, 19, 22) clamping the strip (10, 13) between the lateral disks (5, 6).

Description

 Schaeffler KG Industriestr. 1 - 3, 91074 Herzogenaurach

Name of the invention

Tape roll of a spirally wound up and unwindable tape

description

Field of the invention

The invention relates to a tape roll of a spirally wound up and unwound tape, with a drivable roller body with a central hub and a rotationally symmetrical outer shell and two frontally mounted on the roller body, radially outwardly facing side windows whose radius is greater than the radius of the Outer shell, wherein between axially inner walls of the side windows a flat at least in the wound condition flat band parallel to the outer shell of the Rollenkör- Pers and guided with its outer edges parallel to the walls of the side windows.

Background of the invention

From DE 40 33 289 C2 a generic tape roll of a retractable and spiral up and unwindable tape measure is known which a driven by a spring drive roller body having a central hub and a rotationally symmetrical outer shell and with two frontally mounted on the roller body, radially outwardly facing side windows. The radius of the serving as a flange side discs is greater than the radius of the outer sheath, wherein between axially inner walls of the side windows a flat at least in the wound condition flat band is guided parallel to the outer shell of the roller body and with its outer edges parallel to the walls of the side windows , Such reel body mainly serve the winding and unwinding of a trained as a spread tape tape measure, which should be used in addition to the function of a tape measure for no further purpose. Therefore, it is important in such a roll of tape, on the one hand to lead the spreader through the side windows on the reel body, but on the other hand as possible to avoid frictional engagement of the outer edges of the spreader with the side windows to a slight winding and unwinding the tape measure by the relatively weak Not to hinder spring drive.

A spreading band is understood to mean a band cambered in the transverse direction which, when left to itself, bulges or curls around an axis parallel to its longitudinal axis, so that the top of the spreading band is convex and the underside of the spreading band is concave. Such bands consist for example of metal or plastic and offer due to the curvature of a considerable compressive and flexural stiffness, as they are also shear-stiff, unlike a flat band, which can only be loaded on train. The operating principle of expansion bands has long been known from the field of roll-up tape measures and it has already been proposed to use this principle for linear drives or for wrap-around drives. Thus, in the hitherto unpublished DE 10 2006 059 187 a linear guide module with a linearly movably mounted guide rail on a guide rail is described, which is in driving connection with a drive motor through a connecting element in the form of a spreading belt. The spreader is up and unwound from a roll of tape, the tape roll is not described in detail, so there is room for improvement in this respect.

When using tape rolls for use with a linear drive or a belt transmission, a frictional engagement between the side windows and the belt is sought, in contrast to tape rolls of Maßbändern, as this tensile and compressive forces can be transmitted more precisely.

From DE 38 38 724 A1 discloses a device for guiding a spreader belt is known, with at least one contact surface on which at least a portion of the tape is applied so that the band has in this section under elastic suspension of the transverse curvature curved around at least one transverse axis longitudinal curvature wherein the device has two lateral support surfaces which are inclined towards each other in the direction of the transverse axis so as to converge away from the transverse axis, and which are arranged such that each band section entering the longitudinally arched region is due to Width enlargement, which he experiences in the case of this taking place reduction of its transverse curvature, clamped in an elastically reversible manner immovable between the at least one contact surface and the two lateral support surfaces.

From DE 39 13 443 A1 a similar tape roll with each other in dovetail-shaped arrangement aligned axially inner Wan fertilize the side windows is known in which both the spreader and the axially inner walls of the side windows have a serrated profile. This is intended to ensure the exact reproducibility of the rela- tive position of the spreader with respect to the investment and supporting surfaces bearing side windows are guaranteed even with an extremely high number of engagement and liftoff operations.

From DE 10 2005 048 263 A1, finally, a linear drive is known, in which a spreading belt exerts pressure or tensile forces on an actuator in the form of a pneumatic cylinder. The spreader is wound on a roll of tape or unwound from this. In this case, a guide arrangement in a serrated groove shape is provided in the walls of the side windows for winding up the spreader strip, in which the outer edges of the spreader strip engage. The grooves are intended to improve the pressure forces transmitted by the spreading belt to the actuator.

In the case of the abovementioned constructions, in which the band is clamped between the side discs or frictionally guided on the side discs, an adjustment of the contact forces between the outside edges of the band and the side discs is not possible or at least not precise enough. However, this significantly affects the wear on the belt and the tape roll and the quality of the guide mechanism of the tape. Depending on the application, the tape is namely extended differently far, so over the life of the tape or the tape roll sections of the tape are claimed differently often by up and Abwickelvorgänge with the associated Biegeschwellbeanspruchung and the stress from the frictional contact to the roll of tape.

Object of the invention

The invention has for its object to present a tape roll, which eliminates the disadvantages described. In particular, the tape roll should be structurally designed so that the wear behavior of tape and

Tape reel and the functionality of the tape mechanism are improved. Another object of the invention is to improve a known from DE 102006 059 187 linear drive with respect to the roll of tape used.

Description of the invention

The invention is based on the finding that the stated object can be achieved in that on the axially inner wall of the side window, an elastic element is arranged, in which the band can embed during winding. The band is guided radially in the groove formed there. The lateral guide and the frictional engagement can be applied by the deformable material itself or by the adjacent side window, wherein the side window itself is preferably made of a metallic material.

The invention is therefore according to the features of the main claim of a tape roll of a spirally wound and unwound tape, with a driven roller body with a central hub and a rotationally symmetrical outer shell and with two frontally mounted on the roller body, radially outwardly facing side windows whose Radius is greater than the radius of the outer shell, wherein between axially inner walls of the side windows a flat at least in the wound condition flat band is guided parallel to the outer shell of the roller body and with its outer edges parallel to the walls of the side windows. In addition, it is provided that the axially inner distance between axially inner walls of the side windows is greater than the width of the belt in the flat state, and that between the axially inner walls of the side windows and the outer edges of the belt at least one elastic, sches element is arranged, in which at least one outer edge of the Bandes immersed at least partially in the wound state, wherein the band between the side windows is clamped by the elastic member.

By this construction is advantageously achieved that the tape can be frictionally connect with the side windows of the reel body of the tape roll, but at the same time can reduce wear due to the frictional contact between the belt and side window to a minimum. In addition, the contact forces between the outer edges of the band and the side windows can be adjusted more accurately. It is particularly advantageous to equip a linear guide module known from DE 10 2006 059 187 with the strip roll designed according to the invention, since the adjustment of the contact forces between the outer edges of the spreader strip and the side windows can be made even more precisely by means of the strip roll designed according to the invention.

In addition, it can be provided that in each case an elastic element is disposed between the axially inner walls of the side windows and the outer edges of the band, in each of which an outer edge of the band at least partially immersed in the wound state, wherein the axially inner distance between the two elastic elements smaller than the width of the band.

In other practical developments it can be provided that the elastic element is connected in each case to the axially inner walls of the side windows and is designed in each case as an annular disk made of an elastic material. Another embodiment of the invention provides that the tape dips into the annular disc to form grooves.

Likewise, it is within the scope of the invention to provide that the elastic element is connected to the longitudinal outer edges of the band. This embodiment can be supplemented by the fact that the elastic Element is formed as a plurality of U-shaped profile pieces whose U-legs form a groove, in each of which an outer edge of the band is embedded.

In a particularly practical embodiment of the invention, it is provided that the width of the belt with attached profile pieces is greater than the width of the belt and is greater than the distance between the axially inner walls of the side windows. This embodiment can be supplemented by the fact that the profile pieces are formed in periodic, ie in a harmonious sequence or in disharmonic, that is not periodic sequence of the outer edges of the tape. It can further be provided that the profile pieces are vulcanized or glued to the tape.

In a particularly preferred embodiment of the invention, it is provided that the elastic element in each case consists of an elastomeric material, for example rubber, whose Shore A hardness is between 40 and 80.

Also particularly advantageous is an embodiment of the invention, which is characterized in that the roller body is rotatably mounted in a housing, wherein the tape out of this through a slot in the housing emerges. Another embodiment provides that a hold-down device is provided in the housing, through which the band is pressed radially by means of prestressed spring in the direction of the outer jacket of the reel body.

In a particularly preferred embodiment of the invention, it is provided that the band is a spreading spring made of a spring steel, which is flat in the wound state and in the unwound state for transmitting tensile and compressive forces of the tape roll on a driven means, wherein a top of Spreizbandes a convex and a bottom of the spreader has a concave curvature. It is also within the scope of the invention to provide that the output element is a carriage of a linear guide device, for example according to DE 10 2006 059 187.

Other practical embodiments of the invention are characterized in that the roll of tape is in communication with a position detecting device for detecting the travel position of the spreader, wherein the surface of the spreader is signal technically in communication with at least one signaling device of the position detection device, wherein the signaling device by the profile pieces is formed.

This refinement can be supplemented by the fact that the position detection device is an optical or magnetic sensor. Equally practical is a development of the invention in which it is provided that at least one side window consists of a metallic material.

Finally, another embodiment of the invention is particularly advantageous, which is characterized in that the tape roll is designed as a drive element of a linear drive, a belt drive, as a variable length actuator, as a deflection roller, as a memory for a tape or as a coil for a tape measure.

Brief description of the drawings

The inventively embodied tape roll is explained below with reference to two preferred embodiments with reference to the accompanying drawings. Showing: 1 shows a longitudinal section through a first embodiment of a tape roll according to the invention;

FIG. 2 shows the roll of tape according to FIG. 1 seen from above;

Figure 3 shows the tape roll of Figure 1 in cross section.

Figure 4 shows a detail of the tape roll of Fig. 3 in an enlarged

Presentation;

Figure 5 shows a second embodiment of an inventive

Ribbon roll shown in cross section;

Figure 6 shows a detail of the tape roll of Figure 5 in an enlarged view.

Figure 7 is a spread of the tape roll of Figures 5 and 6 in a perspective view.

Detailed description of the drawings

In FIGS. 1 to 6, a roll of tape 1 according to the invention is accordingly illustrated in different views, the same reference numerals being used for the same components.

The tape roll 1 in each case has a drivable roller body 2 with a central hub 3 and a rotationally symmetrical outer casing 4. In the central hub 3, an unillustrated drive, for example in the form of a spring motor, can be used, through which the tape roll 1 can be rotated. It is also possible to connect the hub 3 with a shaft of, for example, an electric drive motor in order to roll 1 by this drive motor in rotation. At the roller body 2, two radially outwardly directed side windows 5 and 6 are mounted frontally, wherein the radius of the side windows 5, 6 is greater than the radius of the outer shell 4 of the roller body 2, so that the side windows 5 and 6 form two opposing flanges. The existing of a metallic material, such as steel, side windows 5, 6 are fastened by means of screws 7 on the roller body 2. However, it is also possible to form the side windows in one piece with the roller body (FIG. 3).

An axial distance d1 between the axially inner walls 8 and 9 of the side windows 5 and 6 is greater than the axial width d2 of a band 10 which is parallel to the outer shell 4 and with its outer edges 11, 12 between and parallel to the axially inner walls. 8 , 9 of the side discs 5, 6 is guided. The tape 10 is spirally wound on the reel body 2, so that in a plurality of winding turns a corresponding number of layers of the tape 10 come to lie radially above each other. The lowest, so radially innermost position of the belt 10 is arranged at a radial distance from the outer shell 4, but it is also possible to bring the bottom layer in direct contact with the outer shell 4 of the reel body 2.

The band 10 is an expanding band 13 made of spring steel, which is flat in the wound-up state and arched in the unwound state for transmitting tensile and compressive forces from the band reel 1 to a driven means transversely to its longitudinal extent, an upper side of the spreader 13 has a convex and a bottom of the spreader 13 has a concave curvature. The spreader 13 is attached to a first, not shown, end to the reel body 2 and wound up on this and unwound from this. A second end 14 is connected to a driven means, not shown, which can be loaded and actuated by the spreader 13 in tension or pressure. can be moved, for example. The second axial end 14 of the spreader 13 is guided through a slot 15 of a housing 16 of the roll of tape 1. In the housing 16, the roller body 2 is rotatably mounted (Fig. 1, Fig. 2).

In order to enable a lateral non-positive guidance and thus a defined positioning of the belt 10 on the roller body 2, between the axially inner walls 8, 9 of the side windows 5, 6 and the outer edges 11, 12 of the belt 10, an elastic element 17 is arranged in each case which the outer edges 11, 12 of the belt 10 in the wound state on the reel body 2 at least partially submerge. An axial distance d3 between the opposing elastic elements 17 is therefore smaller than the axial width d2 of the band 10 or the spreader 13. The spreader 13 is radially guided in the forming by dipping or embedding groove 18. The lateral guidance and the frictional engagement can be applied by the elastic element 17 itself or by the walls 8, 9 of the adjacent, preferably metallic side windows 5, 6.

In Figures 1 to 4, a first embodiment of a roll of tape 1 in longitudinal section, shown from above and shown in cross section, wherein in Fig. 4 is an enlarged outline of the tape roll 1 according to the circle A of Fig. 3 is shown.

In this first embodiment, the elastic element 17 is in each case connected to the axially inner walls 8, 9 of the side windows 5, 6. The elastic element 17 is in each case designed as an annular disc 19, which consists of an elastomeric material. The elastomeric material may be a rubber material, with preference given to such an elastomeric material whose Shore A hardness is between 40 and 80. When winding the Spreizbandes 13 on the reel body 2 coming into contact with the annular discs 19 outer edges 11 and 12 of the spreader 13 are pressed into the ring body 19 to form the grooves 18, whereby the spreader 13 is reversibly clamped against the roller body 2. When unwinding leave the outer edges 11 and 12, the grooves 18, and the grooves close, due to the material properties of the elastic member 17. In this way, on the one hand in lateral contact with the elastic member 17 outer edges 11, 12 are spared because otherwise there is a risk that the outer edges could be damaged during prolonged operation. On the other hand, radial positional changes of the spreader 13 over the operating time can be compensated, since the outer edges 11, 12 in new grooves 18, which serve the guide, are introduced, so that slight radial positional deviations of the outer edges 11, 12 not to a Ver Edge or bending the outer edges 11, 12 lead. This would be the case if the outer edges 11, 12 would engage rigidly in the walls 8, 9 of the regularly made of steel side windows 5, 6 incorporated grooves.

Thus, the tape 10 wound as close as possible to the roll center a hold-down 20 is provided which presses the belt 10, 13 by means of prestressed springs 21 radially toward the roller center or in the direction of the outer jacket 4. The hold-down 20 by means of springs 21 mounted inside the housing 16 in which the reel body 2 can rotate freely.

In the figures 5 and 6, a second embodiment of a tape roll according to the invention 1 in cross section and as an enlarged section corresponding to the circle B of FIG. 5 is shown. This roll of tape 1 largely corresponds to the roll of tape 1 of Figures 1 to 4, wherein the representation of the second embodiment is different only in that a portion of the belt 10, 13 is shown in the developed state and dispenses with the representation of the housing 16 and the blank holder 20 has been. The Housing 16 and the hold-down 20 can also be provided in this embodiment and be designed as already beschrienen.

Also in this second embodiment are elastic elements 17 between see the axially inner walls 8, 9 of the side windows 5, 6 and the outer edges 11, 12 of the belt 10 is present, in which it is also a spreader 13. The elastic member 17 is also made of an elastomeric material, which is, for example, a rubber having a Shore A hardness between 40 and 80.

In contrast to the embodiment according to FIGS. 1 to 4, however, the elastic element 17 is not connected to the axially inner walls 8, 9 of the side windows 5, 6 but to the outer edges 11, 12 of the spreader 13. The elastic elements 17 are each formed as a U-shaped profile piece 22, the legs of which form a groove 23, in which the outer edges 11, 12 of the spreader 13 are embedded. The profile pieces 22 may be vulcanized or glued to the spreader 13.

After attaching the profile pieces 22 on or on the outer edges 11, 12 of the spreader 13, the width of the spreader 13 in the region of opposing profile pieces 22 changes such that the width d4 of the spreader 13 with patch pieces 22 is greater than the distance d1 between the axially inner walls 8, 9 of the side windows 5, 6.

FIG. 7 shows a section of the belt 10 from FIG. 5 and FIG. 6 in a perspective view. The band 10 in the form of the spreader 13 is flat in the wound state and in the unwound state for transmitting tensile and compressive forces of the tape roll 1 on a driven means, with a top 24 of the spreader 13 a convex and a bottom 25 of the spreader 13 has a concave curvature. The profile pieces 22 are in periodic sequence at the outer edges 11, 12 of the spreader 13 formed. However, a disharmonic sequence of connected to the outer edges 11, 12 profile pieces 22 is possible.

For detecting the path position of the spreading belt 13 and thus of the driven means connected to it, which is preferably a guide carriage known from DE 10 2006 059 187, a position detection device, not shown, preferably an optical sensor, can be arranged such that this position detection device a signaling device connected to the Spreiz- 13 cooperates. Signals from the signaling device are detected by the position detection device and fed to a control device, for example an electronic control and computer unit. From the signals of the spreading band 13 detected by the position detection device, the linear path position of the spreading band 13 and thus of the output means is detected and determined so that the control device acts in a corrective manner if necessary by rotating the roller body 2 by a motor (not shown). As a signaling device, the profile pieces 22 are used. For this purpose, light-dark differences between the spreader and the profile pieces 22 can be exploited, for example, if the profile pieces 22 are made of a rubber material in the rubber mixture carbon black was added. In addition to rubber, however, it is also possible to use other compressible materials, such as relatively soft and deformable polymers and mixtures thereof.

As a signal generator but also the height and / or width differences between the expansion band 13 and the profile pieces 22 can be exploited, wherein also an optical sensor can be used as a position detection device. The band 10 may also have a flat cross section or any other shaped cross section. Depending on the type of tape 10 used, the intended use of the tape roll 1 can also vary. Possible areas of application are, in addition to the described use as a drive element in linear modules as a substitute for toothed belt, the use as a variable-length actuator, as a deflection roller, as a memory for a tape or as a coil for a tape measure.

LIST OF REFERENCE NUMBERS

1 tape roll d1 axial distance

2 roller body d2 width of the belt 10

3 Hub d3 Axial distance

4 outer sheath d4 width of the belt 10 with

5 side window set profile pieces 22

6 side window

7 screw

8 wall

9 wall

10 band

11 outer edge of the tape 10th

12 outer edge of the tape 10th

13 spread band

14 end of the spreader 13th

15 slot

16 housing

17 Elastic element

18 groove

19 ring disk

20 hold-downs

21 spring

22 profile piece

23 groove

24 top

25 bottom

A circle

B circle

Claims

Schaeffler KG Industriestr. 1 - 3, 91074 HerzogenaurachPatentansprüche 1. tape roll (1) of a spirally wound up and unwound strip (10, 13), with a drivable roller body (2) with a central hub (3) and a rotationally symmetrical outer shell (4) and with two frontally mounted on the roller body (2) , Radially outwardly directed side discs (5, 6) whose radius is greater than the radius of the Outer jacket (4), wherein between axially inner walls (8, 9) of the side windows (5, 6) a flat at least in the wound state band (10, 13) parallel to the outer shell (4) of the roller body (2) and with its outer edges ( 11, 12) parallel to the walls (8, 9) of the side windows (5, 6), characterized in that the axially inner spacing (d1) between axially inner walls (8, 9) of the side windows (5, 6) is greater than the width (d2) of the band (10, 13) in the flat state, and that between the axially inner walls (8, 9) of the side windows (5, 6) and the outer edges (11, 12) of the band (10, 13) at least one elastic element (17, 19, 22) is arranged, in which at least one outer edge (11, 12) of the strip (10, 13) at least partly immersed in the wound-up state, wherein the strip (10, 13) between the side windows (5, 6) by the elastic element (17, 19, 22) is clamped. Second tape roll according to claim 1, characterized in that between the axially inner walls (8, 9) of the side windows (5, 6) and the outer edges (11, 12) of the strip (10, 13) each have an elastic element (17, 19, 22) is arranged, in which in each case an outer edge (11, 12) of the strip (10, 13) at least partially immersed in the wound state, wherein the axially inner distance (d3) between the two elastic elements (17, 19, 22) is smaller than the width (d2) of the band (10, 13). 3. tape roll according to claim 2, characterized in that the elastic element (17) in each case with the axially inner walls (8, 9) of the side windows (5, 6) and in each case as an annular disc (19) is formed of an elastic material. 4. tape roll according to claim 3, characterized in that the tape (10, 13) in the annular disc (19) with the formation of grooves (18) is immersed. 5. tape roll according to claim 1, characterized in that the elastic element (17, 22) with the outer edges (11, 12) of the strip (10, 13) is connected. 6. A roll of tape according to claim 5, characterized in that the elastic element (17, 22) is formed as a plurality of U-shaped profile pieces (22) whose legs form a groove (23), in each of which an outer edge ( 11, 12) of the band (10, 13) is embedded. 7. Tape roll according to claim 6, characterized in that the width (d4) of the tape (10; 13) with attached profile pieces (22) is greater than the width (d2) of the tape (10, 13), and that the width (d4) d4) of the band (10, 13) with attached profile pieces (22) is greater than the distance (d1) between the axially inner walls (8, 9) of the side windows (5, 6). 8. tape roll according to claim 6 or 7, characterized in that the profile pieces (22) in a periodic or disharmonious sequence to the outer edges (11, 12) of the strip (10. 13) are integrally formed. 9. tape roll according to at least one of claims 1 to 8, characterized in that the elastic element (17, 19, 22) each consists of an elastomeric material, for example made of rubber. 10. Tape roll according to claim 7, characterized in that the Shore A hardness of the elastic element (17, 19, 22) is between 40 and 80. 11. Tape roll according to at least one of claims 6 to 10, characterized in that the profile pieces (22) on the band (10, 13) are vulcanized or glued nak. 12. A roll of tape according to at least one of claims 1 to 11, characterized in that the roller body (2) is rotatably mounted in a housing (16), wherein the tape (10, 13) through a slot (15) from the housing (16 ) exit. 13. Tape roll according to claim 12, characterized in that in the housing (16) has a hold-down (20) is provided, through which the belt (10, 13) by means of prestressed springs (21) is pressed radially in the direction of the outer jacket (4). 14. tape roll according to at least one of claims 1 to 13, characterized in that the band (10) is a spring steel existing spreading band (13) which is curved flat in the wound state and in the developed state, wherein an upper side (24 ) of the spreader (13) has a convex and a bottom (25) of the spreader (13) has a concave curvature. 15. Tape roll according to claim 14, characterized in that the drive element is a drive carriage of a linear guide device. 16 tape roll at least according to claim 6 and 15, characterized marked, that the tape roll (1) with a position detecting means for Detecting the path position of the expanding belt (13) signal technically in communication, wherein the surface of the spreading belt (13) with at least one signal generator means (22) of the position detection means (11) is provided and the signal generator means by the profile pieces (22) is formed. 17. Tape roll according to claim 16, characterized in that the position detection device is an optical or a magnetic sensor. 18. Tape roll according to at least one of claims 1 to 17, characterized in that at least one side window (5, 6) consists of a metallic material. 19. The tape roll according to at least one of claims 1 to 18, characterized in that the tape roll (1) as a drive element of a linear drive, a belt transmission, as a variable-length actuator, as a guide roller, as a memory for a tape (10, 13) or as a coil for a measuring tape is formed.