CA2083815C - Clamping head for winding tubes - Google Patents
Clamping head for winding tubesInfo
- Publication number
- CA2083815C CA2083815C CA002083815A CA2083815A CA2083815C CA 2083815 C CA2083815 C CA 2083815C CA 002083815 A CA002083815 A CA 002083815A CA 2083815 A CA2083815 A CA 2083815A CA 2083815 C CA2083815 C CA 2083815C
- Authority
- CA
- Canada
- Prior art keywords
- clamping
- clamping head
- pieces
- head shaft
- clamping pieces
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004804 winding Methods 0.000 title claims abstract description 47
- 230000008602 contraction Effects 0.000 claims abstract description 13
- 230000001419 dependent effect Effects 0.000 abstract description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/18—Constructional details
- B65H75/24—Constructional details adjustable in configuration, e.g. expansible
- B65H75/242—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages
- B65H75/246—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages expansion caused by relative rotation around the supporting spindle or core axis
Landscapes
- Winding Of Webs (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Replacement Of Web Rolls (AREA)
Abstract
A clamping head for winding tubes on which material in web form, such as paper webs or the like, is wound on and off has a multiple cornered clamping head shank (20) against which clamping pieces (40) rest. The clamping pieces (40) and the clamping head shank (20) can be ro-tated relative to each other, and this rotation causes a radial movement (expansion/contraction path) of the clamping piece (40). When the torque-dependent expansion is maintained, withdra-wal from the tube is facilitated because the clamping head shank (20) is shaped as a truncated pyramid, the clamping pieces (40) and the clamping head shank (20) can be slid relative to each other in the axial direction (B), the clamping pieces (40) are provided with, or effectively connect-ed to, an end limit stop(34) for the winding tube (10) effective in the axial direction (B) and to an end limit stop (35) fixed to the clamping head shaft (20) effective in the axial direction (B), and the clamping distance (expansion/contraction distance) of the clamping pieces (40) is composed of a rotation-related part and a sliding-related part, so that the (second) end limit stop (35) reaches its axial end position before reaching the end of the clamping distance.
Description
~o ~381 S
Clamping Head for Winding Tubes This invention concerns a clamping head for winding tubes of the type presented in the preamble of Claim 1.
Such a clamping head is known from DE 1 574 438 B. It is used to wind material in web form, like paper webs, plastic sheeting webs, and the like, ontoand off of winding tubes, each tube face end having a clamping head fastened in a centred, essentially circular recess in order to transfer to or from the winding tube the torque required for winding up or for braked winding-off. This known type of clamping head has a hexagon clamping head shaft surrounded by segment-like clamping pieces. ~he radially internal surfaces (contact surfaces) of the clamping pieces rest flat against the six external surfaces of the clamping head shaft as long as they are in their (unexpanded) rest position. The radiallyexternal surfaces of the clamping pieces which are supposed to be brought to rest later in the recess of the winding tube form a circumference which is normally smaller than the inside dimension of the recess on the front end of thewinding tube. The clamping pieces and the clamping head shaft can be rotated with respect to one another. As a result, the clamping pieces can be pressed uniformly in a radially external direction along their entire length in the direction of the axis of the clamping head so that their external surfaces expand and pressure-lock into the recess of the winding tube. Where the web is wound onto the tube, the diameter of the roll and, therefore, the torque to be transferred increases. This automatically increases the expansion of the clamping pieces. However, it is not easy following completion of a winding-on or winding-off operation to produce the same torque between the tube or the roll and the clamping head in the opposite direction which occurred as the maximum torque during the winding operation (in the other direction). Consequently, it is not possible to release or to reset the expander.
Therefore, a great deal of force has to be used to pull the clamping heads from the winding tube in their expanded working position.
A clamping head similar to that described in DE 1 574 438 B is known from DE 29 10 114 Al, the difference between them being that in the latter document the radially interior surfaces of the clamping pieces do not sit flat against the external surfaces of the clamping head shaft. Rather they have a circular cylindrical internal contour with axially running grooves and longitudinal thrust pieces which fit into the grooves and project radially towards the interior with a convex surface and these surfaces sit linearly against the six external surfaces of the clamping head shaft. In the last-mentioned arrangement, less force is necessary to remove the clamping head from the wound tube than is required with the clamping head known from DE 1 574 438 B.
Pulling winding tubes from the clamping head is easier with other types of clamping heads, such as are described in DE 2B 15 310 C among others, than it is with clamping heads of the type discussed at the beginning, because instead of a rotation an axial shift is carried out between the clamping head shaft and the clamping pieces in order to achieve the expansion or contraction i~-- 2a - 208381S
of the clamping pieces. For this purpose, the gliding surfaces between the clamping head shaft and the clamping head pieces are wedge-shaped. An axial stop connected to the clamping pieces which comes to rest on the tube face with the clamping pieces not yet expanded allows a force acting in the axial direction to be transferred, as a result of which the clamping pieces glide along the clamping head shaft and lock into the recess at the end of the winding tube. The constant expansion path throughout the entire free clamping length depends on the magnitude of the insertion force produced in the axial direction. Where the clamping head is pulled from the winding tube, the clamping head shaft first withdraws relative to the clamping pieces, in which case the clamping pieces move in a radially internal direction and radial pressure falls. Therefore, it is easier to pull the clamping head from the winding tube with this type of clamping head than with the clamping heads of the type discussed at the beginning. However, this advantage is combined with the disadvantage, among others, that the clamping force depends exclusively on the axial force exercised on the clamping heads. If this force is too large, the winding tube is deformed; if it is too small, there is a danger of the winding tube and clamping head slipping if the torque increases. Both results are undesirable.
Finally, a further clamping head of the type mentioned at the beginning is known from DE 37 00 472 A1 with which the clamping head shaft not only has a polygonal clamping zone with a constant cross-section viewed in the axial direction but also a truncated-cone-shaped clamping zone with a circular cross-section tapering off in the direction of insertion. The truncated-cone-shaped clamping zone with constant cross-section viewed in the direction of insertion. The purpose of the two clamping zones arranged in tandem is 3 208~81S
that one of the two clamping zones will remain effective in each case where a force acting axially on the clamping head or a force acting circumferentially decreases or is lacking completely. If the clamping head is to be removed again from a wound tube, a relative twisting between clamping head shaft and clamping pieces produces the same problems as occur with the clamping head described in DE 1 574 438 B, because it is difficult, if not impossible, to produce a corresponding effective torque in the opposite direction on the wound tube. In this case the truncated-cone-shaped clamping zone acts as an additional obstacle, because the jacket of the truncated-cone surface sits tightly against the corresponding truncated-cone-shaped surfaces of the clamping pieces. This known geometry of the clamping zones results in the maximum radial clamping path of the clamping pieces which can be produced by the truncated-cone-shaped clamping zone having to be exactly the same size as the maximum clamping path which can be produced by the polygonal clamping zone with constant cross-section. It is only in this way that it can be guaranteed that one of the two clamping zones can also transfer the clamping forces alone, i.e. without the involvement of the other clamping zone.
Therefore, this invention is based on the problem of creating a clamping head of the type mentioned at the beginning which facilitates the clamping head being pulled from the winding tube while the torque-dependent expansion is maintained.
The problem is solved through the features described in patent claim 1.
A clamping head based on the invention has the advantage, among others, that the radial expansion path is torque-dependent so that both damage to the winding ~ 3a - 208381S
tubes as well as slipping of the winding tubes is avoided and, nevertheless, pulling the clamping head from the winding tube is facilitated. Therefore, the advantages of the two ~o ~3~
types of clamping heads discussed at the beginning are combined with one another without the mutual disadvantages occurring. In addition, the clamping head based on patent claim 1 has the advantage that the relative position between the winding tube and the clamping head shaft is always precisely defined in the axial direction because the expansion path consists in all cases of a sliding-related and a rotation-related part, the sliding-related part always automatically having priority because the clamping head necessarily has to be pushed in its axial direction first before rotation can begin. In contrast, the relative position between the clamping pieces (and therefore also the clamping tube) and the clamping head shaft is necessarily variable and undefined with theclamping heads of the second type mentioned. As a rule, however, this is undesirable.
In order to ensure that the expansion path of the clamping pieces is constant over their entire working length in the case of the inventive clamping heads too, a clamping head with the features described in Claim 3 is proposed.
If in a specific application it is not that important that the relative positionbetween the clamping head shaft and the clamping pieces, viewed in the axial direction, is always the same, but it is very definitely important that the expansion path is constant over the entire working length of the clamping pieces, the clamping head described in patent claim 3 is proposed as an alternative to the clamping head described in patent claim 1.
~o 53~1~
The constancy of the expansion path over the working length of the clamping pieces is attained in a particularly simple manner through the featuresdescribed in Claim 4.
A comparatively low frictional resistance between the clamping head shaft and the clamping pieces is achieved during expansion or contraction through the features described in Claim 5. Furthermore, very precisely definablerelative positions between the clamping head shaft and the clamping pieces are achieved as a result. In addition to the unwinding movement between the clamping pieces and the clamping head shaft, however, a certain sliding movement can also occur. The unwinding movement can be realized in a particularly simple manner through the features described in Claim 6.
In order to achieve an automatic resetting of the rotation movement between the clamping head shaft and the clamping pieces after a clamping head is withdrawn from a winding tube, a clamping head with the features described in Claim 7 is proposed. Practical embodiments for this solution, which can be used advantageously with the generic clamping heads, also independent of the characterizing features of Claims 1 and 3, result from Claims 8 and 9.
The above-mentioned, inventive structural components to be used are not subject in their size, form, material selection, and technical design to any special exceptional 3~ 15 conditions, so that known selection criteria can be used unrestrictedly in the relevant area of application.
Further details, features, and advantages of the subject of the invention result from the following descriptions of the relevant drawings, in which - by way of example - a preferred embodiment of an inventive clamping head is illustrated. The drawings show as follows:
Fig. 1a to 1c an inventive clamping head in the rest position, i.e. with the clamping pieces retracted fully towards the interior, Fig. 1a showing a longitudinal section through the clamping head (section along the line la - la as illustrated in Fig. 1b), Fig. 1b a cross-section through the clamping head as illustrated in Fig. 1a (section along the line Ib - Ib), and Fig. 1c a front face view of the clamping head as illustrated in Fig. 1a (View A, i.e. without cover);
Fig. 2a the same clamping head after completion of the clamping pathresulting from the axial shift (Section along the line lla - lla as illustrated in Fig. 2b);
Fig. 2b and 2c the illustrations corresponding to Fig. 1 b and 1 c for the working position of the clamping head shown in Fig. 2a:
~o~3~15 Fig. 3a to 3c the same clamping head in the corresponding illustration as in Figs.
1a to 1c but in a third working position (winding position, i.e. with clamping pieces expanded firmly in the interior of the winding tube);
Fig. 4a to 4c the same clamping head in a fourth working position, i.e. with clamping head shaft still rotated relative to the clamping pieces but already pulled back in the axial direction;
Fig. 5 a diagrammatic front face view of the same clamping head Icorresponding to View A~ to illustrate the relative positions between clamping head shaft and clamping piece with and without mutual rotation;
Fig. 6 an alternative embodiment of the clamping head shaft in the same view as in Fig. 5.
A clamping head for winding tubes 10, which is generally designated with 100 in the Figures, consists of a clamping head shaft 20, a tube-shaped part serving as clamping head housing 30, and clamping pieces 40.
The winding tubes 10 illustrated in the Figures consist, as can be seen in Figs. la/b, of circular cylindrical pipes with front ends 11 and a concentric recess 12 accessible from the front end into which the clamping head ~_0 ~ 1 5 100 can be inserted in the axial direction. Although pipe-shaped winding tubes are the most common ones, it is also possible in principle to use internally closed circular cylindrical bodies with corresponding recesses in the front endsas winding tubes.
The clamping head shaft 20 is shaped as a hexahedral truncated pyramid whose base 21 is fastened to a plate 22. The plate 22 or the clamping head shaft 20 itself are pivoted on brackets, using a method which is known in general, and, if necessary, can be driven around the axial direction B in the direction of rotation. The clamping head shaft is designed as a collar shaft, i.e.
fastened on one side. With regard to its base 21 and its free end 23, the clamping head housing 30 is pivoted. A return device 50 (to be described below) is attached to its free end.
The six clamping surfaces 24 of the clamping head shaft 20 are slightly inclined in relation to the axial direction B and are linear in the direction ofextension corresponding to the axial direction. On the other hand, the clamping surfaces 24 in the direction C of the clamping head circumference (see Fig. 1c and Fig. 5) are concave, this concave curvature being most marked at the narrow end (free end 23) of the truncated pyramid and decreasing constantly to nil at the base 21. This is shown especially clearly in Fig. 5.
~ ~ 83~ 15 The six clamping pieces 40 uniformly distributed on the circumference consist of pressure pieces 41 and gliding pieces 42 which are connected to one another in a manner which is generally known. Springs 44 which (as can be seen in Fig. 1 b) are designed as open rings and which serve as return springs working in the direction of contraction pass through an opening 43 in each clamping piece 40 in the circumferential direction. The gliding pieces 42 are, as can be seen in Fig. 1a, linear in the axial direction and, as can be seen in Figs. 5 and 6, concave in the transverse extension (circumferential direction C), so that the contact surfaces 45 with which they rest against the corresponding clamping surface 24 of the clamping head shaft 20 are circular cylindrical in shape. As a result, the relevant contact between clamping piece and clamping head shaft occurs along a contact line 46 (see Figs. 5 and 6) - and independently of the magnitude of the angle of torsion between clamping head shaft and clamping piece.
The clamping head housing 30 has a cylindrical sliding surface 31 at the base end of the clamping head shaft and a cylindrical sliding surface 32 at the free clamping head end. At the base end is a flange-like projecting stop 33 which is connected to the clamping head housing in one piece or attached to it.
It forms a first end stop 34 for the front end 11 of the winding tube 10 and a second end stop 35 for the axial movement relative to the clamping head shaft 20 which acts together with the plate 22 (see Fig. 2a). The clamping head housing 30 has slotted openings 36 in which the clamping pieces sit and are arranged so that they can be shifted radially. End stops 37 limit ~ o ~ 1 5 the maximum possible expansion path of the clamping pieces 40.
The resetting device 50 is located in a tapered cover 51 which is connected to the clamping head housing 30, for example by means of screws not shown in the drawing, so that it cannot be rotated. Inside of the cover 50 is a ring-shaped or ring-segment-shaped groove in which two coil springs 53, a cover-fixed, i.e. also a housing-fixed, stop 54, and a circular ring-segment-shaped catch 55 are located. The catch 55 is connected to an arm 56 by which it is attached to the free front end of the clamping head shaft 20 so thatit cannot rotate. The catch 55 and the arm 56 are designed so that they can be rotated jointly against the resetting effect of the springs 53 within the cover 51 as well as in regard to the clamping head housing 30. The springs 53 hold the clamping head housing 30 and the clamping head shaft 20 in a neutral rotation position to one another as long as the clamping head is outside of the winding tube or the rotation between the clamping head shaft and the clamping head housing has still not occurred, which is the case in the working positions illustrated in Figs. 1 and 2. After rotation has being carried out, one of the springs 53 is under tension and the other spring 53 is released or under tensionin the opposite direction. This can be seen in Figs. 3c and 4c. The energy now stored in the compressed or expanded spring is only released again when the winding tube is pulled from the clamping head.
A comparison between Figs. 1a and 2a shows clearly that the maximum possible shift between the clamping head shaft 20 and the clamping head housing 30 in the axial direction B is relatively small and with the help of thecatch arm 56 is limited by the internal surface 57 of the cover 51, on the one hand, and the face 58 of the clamping head housing 30, on the other. In conjunction with the minor tapering of the clamping surfaces 24 of the clamping head shaft 20 to one another, this results in the shift-related expansion path of the clamping pieces 40 being relatively small. A comparison of Figs. 1a and 2a shows this clearly. As a rule, it is not even necessary (although possible) thatthe radially external pressure surface 47 of the clamping pieces 40 be in contact with the internal wall surfaces of the winding tube 10 if the shift-related expansion path of the clamping pieces is passed through completely (see Fig.
2a). In this working position, there has to be merely an initial but still relatively minor frictional engagement between the winding tube 10 and the clamping head 100, so that if the clamping head is rotated against a tensile force actingon the periphery of the winding tube, a rotation is possible between the clamping head housing and the clamping pieces, on the one hand, and the clamping head shaft, on the other. With such a rotational movement, a combined sliding and rolling movement occurs between the clamping head shaft and the clamping pieces. This can be seen especially clearly in Figs. 5 and 6.
As a result the clamping pieces are radially expanded to the exterior and lock firmly in the recess 12 in the winding tube 10 (see Figs. 3a to 3b).
Where the winding tube is to be pulled from the clamping head again, an axial force directed to the exterior is used on the clamping head in a known manner. As a result, the clamping head shaft 20 draws back out of the clamping head housing 30 by a small shifted distance. This cancels the shift-related expansion path on the clamping pieces, which is supported by the return springs 44. This relatively small contraction path of the clamping pieces, whichis already concluded in the illustrations in Figs. 4a to 4c, is sufficient for the clamping head to be pulled out of the winding tube 10 with a comparatively small amount of force.
Figs. 5 and 6 show that the expansion path of the clamping pieces 40 or the gliding pieces 42 is identical at the front and rear ends, viewed in the axial direction, of the clamping pieces, because the clamping surfaces 24 exhibit a constantly changing curvature along the clamping head shaft. As a result of the gradual transition between the maximum and minimum curvature along the clamping head shaft, the gliding pieces rest on the clamping pieces 24 along their entire length. Therefore, the pressure surfaces 47 of the clamping pieces 40 remain parallel to the axis in all expansion or contraction positions. The required curvature geometry can be determined relatively easily mathematically.
The same effect can also be achieved if the curvature, especially the radius of curvature, of the contact surface 45 of the gliding pieces 42 changes continuously along the length of the clamping piece 40 or if different curvatures are provided on both the clamping head shaft as well as the clamping pieces.
The geometry ~ o ~
illustrated in Figs. 5 and 6 has the advantage, however, that it can be masteredespecially easily.
Reference number list:
winding tube 54 stop 11 front ends 55 catch 12 recess 56 arm clamping head shaft 57 internal surface 21 base 100 clamping head 22 plate 23 free end A view 24 clamping surfaces B axial direction clamping head housing C circumferential 31 gliding surface direction 32 gliding surface 33 stop 34 first end stop second end stop 36 openings 37 end stops 38 face clamping pieces 41 pressure piece 42 sliding piece 43 opening 44 spring contact surface 46 contact line 47 pressure surfaces (external surfaces) resetting device 51 cover 52 groove 53 coil springs
Clamping Head for Winding Tubes This invention concerns a clamping head for winding tubes of the type presented in the preamble of Claim 1.
Such a clamping head is known from DE 1 574 438 B. It is used to wind material in web form, like paper webs, plastic sheeting webs, and the like, ontoand off of winding tubes, each tube face end having a clamping head fastened in a centred, essentially circular recess in order to transfer to or from the winding tube the torque required for winding up or for braked winding-off. This known type of clamping head has a hexagon clamping head shaft surrounded by segment-like clamping pieces. ~he radially internal surfaces (contact surfaces) of the clamping pieces rest flat against the six external surfaces of the clamping head shaft as long as they are in their (unexpanded) rest position. The radiallyexternal surfaces of the clamping pieces which are supposed to be brought to rest later in the recess of the winding tube form a circumference which is normally smaller than the inside dimension of the recess on the front end of thewinding tube. The clamping pieces and the clamping head shaft can be rotated with respect to one another. As a result, the clamping pieces can be pressed uniformly in a radially external direction along their entire length in the direction of the axis of the clamping head so that their external surfaces expand and pressure-lock into the recess of the winding tube. Where the web is wound onto the tube, the diameter of the roll and, therefore, the torque to be transferred increases. This automatically increases the expansion of the clamping pieces. However, it is not easy following completion of a winding-on or winding-off operation to produce the same torque between the tube or the roll and the clamping head in the opposite direction which occurred as the maximum torque during the winding operation (in the other direction). Consequently, it is not possible to release or to reset the expander.
Therefore, a great deal of force has to be used to pull the clamping heads from the winding tube in their expanded working position.
A clamping head similar to that described in DE 1 574 438 B is known from DE 29 10 114 Al, the difference between them being that in the latter document the radially interior surfaces of the clamping pieces do not sit flat against the external surfaces of the clamping head shaft. Rather they have a circular cylindrical internal contour with axially running grooves and longitudinal thrust pieces which fit into the grooves and project radially towards the interior with a convex surface and these surfaces sit linearly against the six external surfaces of the clamping head shaft. In the last-mentioned arrangement, less force is necessary to remove the clamping head from the wound tube than is required with the clamping head known from DE 1 574 438 B.
Pulling winding tubes from the clamping head is easier with other types of clamping heads, such as are described in DE 2B 15 310 C among others, than it is with clamping heads of the type discussed at the beginning, because instead of a rotation an axial shift is carried out between the clamping head shaft and the clamping pieces in order to achieve the expansion or contraction i~-- 2a - 208381S
of the clamping pieces. For this purpose, the gliding surfaces between the clamping head shaft and the clamping head pieces are wedge-shaped. An axial stop connected to the clamping pieces which comes to rest on the tube face with the clamping pieces not yet expanded allows a force acting in the axial direction to be transferred, as a result of which the clamping pieces glide along the clamping head shaft and lock into the recess at the end of the winding tube. The constant expansion path throughout the entire free clamping length depends on the magnitude of the insertion force produced in the axial direction. Where the clamping head is pulled from the winding tube, the clamping head shaft first withdraws relative to the clamping pieces, in which case the clamping pieces move in a radially internal direction and radial pressure falls. Therefore, it is easier to pull the clamping head from the winding tube with this type of clamping head than with the clamping heads of the type discussed at the beginning. However, this advantage is combined with the disadvantage, among others, that the clamping force depends exclusively on the axial force exercised on the clamping heads. If this force is too large, the winding tube is deformed; if it is too small, there is a danger of the winding tube and clamping head slipping if the torque increases. Both results are undesirable.
Finally, a further clamping head of the type mentioned at the beginning is known from DE 37 00 472 A1 with which the clamping head shaft not only has a polygonal clamping zone with a constant cross-section viewed in the axial direction but also a truncated-cone-shaped clamping zone with a circular cross-section tapering off in the direction of insertion. The truncated-cone-shaped clamping zone with constant cross-section viewed in the direction of insertion. The purpose of the two clamping zones arranged in tandem is 3 208~81S
that one of the two clamping zones will remain effective in each case where a force acting axially on the clamping head or a force acting circumferentially decreases or is lacking completely. If the clamping head is to be removed again from a wound tube, a relative twisting between clamping head shaft and clamping pieces produces the same problems as occur with the clamping head described in DE 1 574 438 B, because it is difficult, if not impossible, to produce a corresponding effective torque in the opposite direction on the wound tube. In this case the truncated-cone-shaped clamping zone acts as an additional obstacle, because the jacket of the truncated-cone surface sits tightly against the corresponding truncated-cone-shaped surfaces of the clamping pieces. This known geometry of the clamping zones results in the maximum radial clamping path of the clamping pieces which can be produced by the truncated-cone-shaped clamping zone having to be exactly the same size as the maximum clamping path which can be produced by the polygonal clamping zone with constant cross-section. It is only in this way that it can be guaranteed that one of the two clamping zones can also transfer the clamping forces alone, i.e. without the involvement of the other clamping zone.
Therefore, this invention is based on the problem of creating a clamping head of the type mentioned at the beginning which facilitates the clamping head being pulled from the winding tube while the torque-dependent expansion is maintained.
The problem is solved through the features described in patent claim 1.
A clamping head based on the invention has the advantage, among others, that the radial expansion path is torque-dependent so that both damage to the winding ~ 3a - 208381S
tubes as well as slipping of the winding tubes is avoided and, nevertheless, pulling the clamping head from the winding tube is facilitated. Therefore, the advantages of the two ~o ~3~
types of clamping heads discussed at the beginning are combined with one another without the mutual disadvantages occurring. In addition, the clamping head based on patent claim 1 has the advantage that the relative position between the winding tube and the clamping head shaft is always precisely defined in the axial direction because the expansion path consists in all cases of a sliding-related and a rotation-related part, the sliding-related part always automatically having priority because the clamping head necessarily has to be pushed in its axial direction first before rotation can begin. In contrast, the relative position between the clamping pieces (and therefore also the clamping tube) and the clamping head shaft is necessarily variable and undefined with theclamping heads of the second type mentioned. As a rule, however, this is undesirable.
In order to ensure that the expansion path of the clamping pieces is constant over their entire working length in the case of the inventive clamping heads too, a clamping head with the features described in Claim 3 is proposed.
If in a specific application it is not that important that the relative positionbetween the clamping head shaft and the clamping pieces, viewed in the axial direction, is always the same, but it is very definitely important that the expansion path is constant over the entire working length of the clamping pieces, the clamping head described in patent claim 3 is proposed as an alternative to the clamping head described in patent claim 1.
~o 53~1~
The constancy of the expansion path over the working length of the clamping pieces is attained in a particularly simple manner through the featuresdescribed in Claim 4.
A comparatively low frictional resistance between the clamping head shaft and the clamping pieces is achieved during expansion or contraction through the features described in Claim 5. Furthermore, very precisely definablerelative positions between the clamping head shaft and the clamping pieces are achieved as a result. In addition to the unwinding movement between the clamping pieces and the clamping head shaft, however, a certain sliding movement can also occur. The unwinding movement can be realized in a particularly simple manner through the features described in Claim 6.
In order to achieve an automatic resetting of the rotation movement between the clamping head shaft and the clamping pieces after a clamping head is withdrawn from a winding tube, a clamping head with the features described in Claim 7 is proposed. Practical embodiments for this solution, which can be used advantageously with the generic clamping heads, also independent of the characterizing features of Claims 1 and 3, result from Claims 8 and 9.
The above-mentioned, inventive structural components to be used are not subject in their size, form, material selection, and technical design to any special exceptional 3~ 15 conditions, so that known selection criteria can be used unrestrictedly in the relevant area of application.
Further details, features, and advantages of the subject of the invention result from the following descriptions of the relevant drawings, in which - by way of example - a preferred embodiment of an inventive clamping head is illustrated. The drawings show as follows:
Fig. 1a to 1c an inventive clamping head in the rest position, i.e. with the clamping pieces retracted fully towards the interior, Fig. 1a showing a longitudinal section through the clamping head (section along the line la - la as illustrated in Fig. 1b), Fig. 1b a cross-section through the clamping head as illustrated in Fig. 1a (section along the line Ib - Ib), and Fig. 1c a front face view of the clamping head as illustrated in Fig. 1a (View A, i.e. without cover);
Fig. 2a the same clamping head after completion of the clamping pathresulting from the axial shift (Section along the line lla - lla as illustrated in Fig. 2b);
Fig. 2b and 2c the illustrations corresponding to Fig. 1 b and 1 c for the working position of the clamping head shown in Fig. 2a:
~o~3~15 Fig. 3a to 3c the same clamping head in the corresponding illustration as in Figs.
1a to 1c but in a third working position (winding position, i.e. with clamping pieces expanded firmly in the interior of the winding tube);
Fig. 4a to 4c the same clamping head in a fourth working position, i.e. with clamping head shaft still rotated relative to the clamping pieces but already pulled back in the axial direction;
Fig. 5 a diagrammatic front face view of the same clamping head Icorresponding to View A~ to illustrate the relative positions between clamping head shaft and clamping piece with and without mutual rotation;
Fig. 6 an alternative embodiment of the clamping head shaft in the same view as in Fig. 5.
A clamping head for winding tubes 10, which is generally designated with 100 in the Figures, consists of a clamping head shaft 20, a tube-shaped part serving as clamping head housing 30, and clamping pieces 40.
The winding tubes 10 illustrated in the Figures consist, as can be seen in Figs. la/b, of circular cylindrical pipes with front ends 11 and a concentric recess 12 accessible from the front end into which the clamping head ~_0 ~ 1 5 100 can be inserted in the axial direction. Although pipe-shaped winding tubes are the most common ones, it is also possible in principle to use internally closed circular cylindrical bodies with corresponding recesses in the front endsas winding tubes.
The clamping head shaft 20 is shaped as a hexahedral truncated pyramid whose base 21 is fastened to a plate 22. The plate 22 or the clamping head shaft 20 itself are pivoted on brackets, using a method which is known in general, and, if necessary, can be driven around the axial direction B in the direction of rotation. The clamping head shaft is designed as a collar shaft, i.e.
fastened on one side. With regard to its base 21 and its free end 23, the clamping head housing 30 is pivoted. A return device 50 (to be described below) is attached to its free end.
The six clamping surfaces 24 of the clamping head shaft 20 are slightly inclined in relation to the axial direction B and are linear in the direction ofextension corresponding to the axial direction. On the other hand, the clamping surfaces 24 in the direction C of the clamping head circumference (see Fig. 1c and Fig. 5) are concave, this concave curvature being most marked at the narrow end (free end 23) of the truncated pyramid and decreasing constantly to nil at the base 21. This is shown especially clearly in Fig. 5.
~ ~ 83~ 15 The six clamping pieces 40 uniformly distributed on the circumference consist of pressure pieces 41 and gliding pieces 42 which are connected to one another in a manner which is generally known. Springs 44 which (as can be seen in Fig. 1 b) are designed as open rings and which serve as return springs working in the direction of contraction pass through an opening 43 in each clamping piece 40 in the circumferential direction. The gliding pieces 42 are, as can be seen in Fig. 1a, linear in the axial direction and, as can be seen in Figs. 5 and 6, concave in the transverse extension (circumferential direction C), so that the contact surfaces 45 with which they rest against the corresponding clamping surface 24 of the clamping head shaft 20 are circular cylindrical in shape. As a result, the relevant contact between clamping piece and clamping head shaft occurs along a contact line 46 (see Figs. 5 and 6) - and independently of the magnitude of the angle of torsion between clamping head shaft and clamping piece.
The clamping head housing 30 has a cylindrical sliding surface 31 at the base end of the clamping head shaft and a cylindrical sliding surface 32 at the free clamping head end. At the base end is a flange-like projecting stop 33 which is connected to the clamping head housing in one piece or attached to it.
It forms a first end stop 34 for the front end 11 of the winding tube 10 and a second end stop 35 for the axial movement relative to the clamping head shaft 20 which acts together with the plate 22 (see Fig. 2a). The clamping head housing 30 has slotted openings 36 in which the clamping pieces sit and are arranged so that they can be shifted radially. End stops 37 limit ~ o ~ 1 5 the maximum possible expansion path of the clamping pieces 40.
The resetting device 50 is located in a tapered cover 51 which is connected to the clamping head housing 30, for example by means of screws not shown in the drawing, so that it cannot be rotated. Inside of the cover 50 is a ring-shaped or ring-segment-shaped groove in which two coil springs 53, a cover-fixed, i.e. also a housing-fixed, stop 54, and a circular ring-segment-shaped catch 55 are located. The catch 55 is connected to an arm 56 by which it is attached to the free front end of the clamping head shaft 20 so thatit cannot rotate. The catch 55 and the arm 56 are designed so that they can be rotated jointly against the resetting effect of the springs 53 within the cover 51 as well as in regard to the clamping head housing 30. The springs 53 hold the clamping head housing 30 and the clamping head shaft 20 in a neutral rotation position to one another as long as the clamping head is outside of the winding tube or the rotation between the clamping head shaft and the clamping head housing has still not occurred, which is the case in the working positions illustrated in Figs. 1 and 2. After rotation has being carried out, one of the springs 53 is under tension and the other spring 53 is released or under tensionin the opposite direction. This can be seen in Figs. 3c and 4c. The energy now stored in the compressed or expanded spring is only released again when the winding tube is pulled from the clamping head.
A comparison between Figs. 1a and 2a shows clearly that the maximum possible shift between the clamping head shaft 20 and the clamping head housing 30 in the axial direction B is relatively small and with the help of thecatch arm 56 is limited by the internal surface 57 of the cover 51, on the one hand, and the face 58 of the clamping head housing 30, on the other. In conjunction with the minor tapering of the clamping surfaces 24 of the clamping head shaft 20 to one another, this results in the shift-related expansion path of the clamping pieces 40 being relatively small. A comparison of Figs. 1a and 2a shows this clearly. As a rule, it is not even necessary (although possible) thatthe radially external pressure surface 47 of the clamping pieces 40 be in contact with the internal wall surfaces of the winding tube 10 if the shift-related expansion path of the clamping pieces is passed through completely (see Fig.
2a). In this working position, there has to be merely an initial but still relatively minor frictional engagement between the winding tube 10 and the clamping head 100, so that if the clamping head is rotated against a tensile force actingon the periphery of the winding tube, a rotation is possible between the clamping head housing and the clamping pieces, on the one hand, and the clamping head shaft, on the other. With such a rotational movement, a combined sliding and rolling movement occurs between the clamping head shaft and the clamping pieces. This can be seen especially clearly in Figs. 5 and 6.
As a result the clamping pieces are radially expanded to the exterior and lock firmly in the recess 12 in the winding tube 10 (see Figs. 3a to 3b).
Where the winding tube is to be pulled from the clamping head again, an axial force directed to the exterior is used on the clamping head in a known manner. As a result, the clamping head shaft 20 draws back out of the clamping head housing 30 by a small shifted distance. This cancels the shift-related expansion path on the clamping pieces, which is supported by the return springs 44. This relatively small contraction path of the clamping pieces, whichis already concluded in the illustrations in Figs. 4a to 4c, is sufficient for the clamping head to be pulled out of the winding tube 10 with a comparatively small amount of force.
Figs. 5 and 6 show that the expansion path of the clamping pieces 40 or the gliding pieces 42 is identical at the front and rear ends, viewed in the axial direction, of the clamping pieces, because the clamping surfaces 24 exhibit a constantly changing curvature along the clamping head shaft. As a result of the gradual transition between the maximum and minimum curvature along the clamping head shaft, the gliding pieces rest on the clamping pieces 24 along their entire length. Therefore, the pressure surfaces 47 of the clamping pieces 40 remain parallel to the axis in all expansion or contraction positions. The required curvature geometry can be determined relatively easily mathematically.
The same effect can also be achieved if the curvature, especially the radius of curvature, of the contact surface 45 of the gliding pieces 42 changes continuously along the length of the clamping piece 40 or if different curvatures are provided on both the clamping head shaft as well as the clamping pieces.
The geometry ~ o ~
illustrated in Figs. 5 and 6 has the advantage, however, that it can be masteredespecially easily.
Reference number list:
winding tube 54 stop 11 front ends 55 catch 12 recess 56 arm clamping head shaft 57 internal surface 21 base 100 clamping head 22 plate 23 free end A view 24 clamping surfaces B axial direction clamping head housing C circumferential 31 gliding surface direction 32 gliding surface 33 stop 34 first end stop second end stop 36 openings 37 end stops 38 face clamping pieces 41 pressure piece 42 sliding piece 43 opening 44 spring contact surface 46 contact line 47 pressure surfaces (external surfaces) resetting device 51 cover 52 groove 53 coil springs
Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A clamping head for winding tubes, on which material in web form can be wound and unwound, comprising:
a polygonal clamping head shaft, and clamping pieces abutting the clamping head shaft, the clamping pieces and the clamping head shaft being rotatable relative to one another, with this rotation resulting in a radial movement on an expansion/contraction path of the clamping pieces, wherein;
the clamping head shaft is a truncated pyramid, the clamping pieces and the clamping head shaft can move relative to one another in an axial direction, the clamping pieces are provided with or are secured to an end stop for limiting axial movement of a winding tube on the one hand and of the clamping head shaft on the other hand, and the expansion/contraction path of the clamping pieces comprises a rotation generated component and a sliding generated component, such that the end stop limits relative axial movement of the winding tube relative to the clamping head shaft before the clamping pieces complete their travel through the expansion/contraction path.
a polygonal clamping head shaft, and clamping pieces abutting the clamping head shaft, the clamping pieces and the clamping head shaft being rotatable relative to one another, with this rotation resulting in a radial movement on an expansion/contraction path of the clamping pieces, wherein;
the clamping head shaft is a truncated pyramid, the clamping pieces and the clamping head shaft can move relative to one another in an axial direction, the clamping pieces are provided with or are secured to an end stop for limiting axial movement of a winding tube on the one hand and of the clamping head shaft on the other hand, and the expansion/contraction path of the clamping pieces comprises a rotation generated component and a sliding generated component, such that the end stop limits relative axial movement of the winding tube relative to the clamping head shaft before the clamping pieces complete their travel through the expansion/contraction path.
2. A clamping head for winding tubes, on which material in web form can be wound and unwound, comprising:
a polygonal clamping head shaft, and clamping pieces abutting the clamping head shaft, the clamping pieces and the clamping head shaft being rotatable relative to one another, with this rotation causing a radial movement on an expansion/contraction path of the clamping pieces, wherein;
the clamping head shaft is a truncated pyramid, the clamping pieces are provided with or secured to an end stop for limiting axial movement of a winding tube on the one hand and of the clamping head shaft on the other hand, and either or both of clamping surfaces of the clamping head shaft and contact surfaces of the clamping pieces abutting said clamping surfaces are curved circumferentially of the clamping head with the curvature changing continuously in the axial direction so that a given rotation between the clamping head shaft and the clamping pieces results in the same movement along the expansion/contraction path over the entire axial extent of the clamping pieces.
a polygonal clamping head shaft, and clamping pieces abutting the clamping head shaft, the clamping pieces and the clamping head shaft being rotatable relative to one another, with this rotation causing a radial movement on an expansion/contraction path of the clamping pieces, wherein;
the clamping head shaft is a truncated pyramid, the clamping pieces are provided with or secured to an end stop for limiting axial movement of a winding tube on the one hand and of the clamping head shaft on the other hand, and either or both of clamping surfaces of the clamping head shaft and contact surfaces of the clamping pieces abutting said clamping surfaces are curved circumferentially of the clamping head with the curvature changing continuously in the axial direction so that a given rotation between the clamping head shaft and the clamping pieces results in the same movement along the expansion/contraction path over the entire axial extent of the clamping pieces.
3. A clamping head in accordance with Claim 1, wherein either or both of clamping surfaces of the clamping head shaft and contact surfaces of the clamping pieces abutting said clamping surfaces are curved circumferentially of the clamping head with the curvature changing continuously in the axial direction so that given rotation between the clamping head shaft and the clamping pieces results in the same movement along the expansion/contraction path over the entire axial extent of the clamping pieces.
4. A clamping head in accordance with Claim 2 or 3, wherein the clamping surfaces are straight at a wider end of the clamping head shaft and concave at a narrower end, or are convex at the wider end and straight at the narrower end.
5. A clamping head in accordance with Claim 1, wherein either or both of clamping surfaces of the clamping head shaft and contact surfaces of the clamping pieces abutting the clamping surfaces are curved circumferentially of the clamping head, so that mutual contact between the clamping head shaft and the individual clamping pieces is essentially linear and permits at least a partial rolling-off movement between the clamping head shaft and the individual clamping pieces.
6. A clamping head in accordance with Claim 5, wherein the contact surfaces of the clamping pieces are part cylindrical.
7. A clamping head in accordance with Claim 2, wherein either or both of clamping surfaces of the clamping head shaft and contact surfaces of the clamping pieces abutting the clamping surfaces are curved circumferentially of the clamping head, so that mutual contact between the clamping head shaft and the individual clamping pieces is essentially linear and permits at least a partial rolling-of movement between the clamping head shaft and the individual clamping pieces.
8. A clamping head in accordance with Claim 7, wherein the contact surfaces of the clamping pieces are part cylindrical.
9. A clamping head in accordance with Claim 1, including at least one spring acting to provide return rotation of the clamping pieces after a winding tube has been pulled from the clamping head, the or each spring being located to be tensioned by rotation between the clamping pieces and the clamping head shaft.
10. A clamping head in accordance with Claim 9, wherein the spring is a single coil spring extending approximately circumferentially of the clamping head.
11. A clamping head in accordance with Claim 9 or 10, wherein the or each spring acts between a stop fast to an axially movable housing rotatable together with the clamping pieces relative to the clamping head shaft, and a member attached to the clamping head shaft.
12. A clamping head in accordance with Claim 2, including at least one spring acting to provide return rotation of the clamping pieces after a winding tube has been pulled from the clamping head, the or each spring being located to be tensioned by rotation between the clamping pieces and the clamping head shaft.
13. A clamping head in accordance with Claim 12, wherein the spring is a single coil spring extending approximately circumferentially of the clamping head.
14. A clamping head in accordance with Claim 12 or 13, wherein the or each spring acts between a stop fast to an axially movable housing rotatable together with the clamping pieces relative to the clamping head shaft, and a member attached to the clamping head shaft.
15. A clamping head in accordance with any one of Claims 1 to 3, 5 to 10, 12 or 13, including a housing component which has openings receiving the clamping pieces and moveable axially together with the clamping pieces in at least one direction relative to the clamping head shaft.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4017007.1 | 1990-05-26 | ||
| DE4017007 | 1990-05-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2083815A1 CA2083815A1 (en) | 1991-11-27 |
| CA2083815C true CA2083815C (en) | 1996-04-23 |
Family
ID=6407260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002083815A Expired - Fee Related CA2083815C (en) | 1990-05-26 | 1990-06-21 | Clamping head for winding tubes |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0531285B1 (en) |
| JP (1) | JPH0729710B2 (en) |
| BR (1) | BR9008024A (en) |
| CA (1) | CA2083815C (en) |
| DE (1) | DE59004646D1 (en) |
| FI (1) | FI101214B (en) |
| WO (1) | WO1991018819A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI100002B (en) * | 1994-06-23 | 1997-07-15 | Valmet Paper Machinery Inc | Tension head for roller sleeves |
| US6905686B1 (en) | 1997-12-02 | 2005-06-14 | Neuralab Limited | Active immunization for treatment of alzheimer's disease |
| US6750324B1 (en) | 1997-12-02 | 2004-06-15 | Neuralab Limited | Humanized and chimeric N-terminal amyloid beta-antibodies |
| DE102005021077A1 (en) * | 2005-05-06 | 2006-11-09 | Kampf Gmbh & Co Maschinenfabrik | Clamping head for a slitter winder and winding machine |
| WO2013128479A1 (en) * | 2012-02-27 | 2013-09-06 | I.E.S. International Expanding Shafts S.R.L | Expandable shaft for supporting reels and the like |
| EP2985253B1 (en) * | 2014-08-12 | 2018-12-05 | I.E.S International Expanding Shafts S.R.L. | Friction ring for friction shafts, particularly for rewinding spools |
| CN112875368B (en) * | 2021-01-27 | 2023-05-09 | 重庆望变电气（集团）股份有限公司 | Taper tension winding process after cold coating of silicon steel |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1574438B2 (en) * | 1966-10-13 | 1971-10-21 | Sonoco Products Co, Hartsville, SC (VStA) | EXTENSIBLE TENSIONING PIN FOR TUBULAR CORES |
| DE2815310C2 (en) * | 1978-04-08 | 1982-06-16 | Jagenberg-Werke AG, 4000 Düsseldorf | Clamping head for winding cores |
| DE2910114C2 (en) * | 1979-03-15 | 1983-04-21 | A. Ahlström Development GmbH, 7315 Weilheim | Clamping head for the core tubes of wraps made of paper, plastic films and the like. |
| DE3700472A1 (en) * | 1987-01-09 | 1988-07-21 | Goebel Gmbh Maschf | Expansion clamping head (chuck) |
-
1990
- 1990-06-21 EP EP90909709A patent/EP0531285B1/en not_active Expired - Lifetime
- 1990-06-21 JP JP2509171A patent/JPH0729710B2/en not_active Expired - Lifetime
- 1990-06-21 CA CA002083815A patent/CA2083815C/en not_active Expired - Fee Related
- 1990-06-21 WO PCT/EP1990/000980 patent/WO1991018819A1/en not_active Ceased
- 1990-06-21 BR BR909008024A patent/BR9008024A/en not_active IP Right Cessation
- 1990-06-21 DE DE90909709T patent/DE59004646D1/en not_active Expired - Fee Related
-
1992
- 1992-11-25 FI FI925356A patent/FI101214B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| FI101214B1 (en) | 1998-05-15 |
| FI101214B (en) | 1998-05-15 |
| FI925356A0 (en) | 1992-11-25 |
| DE59004646D1 (en) | 1994-03-24 |
| CA2083815A1 (en) | 1991-11-27 |
| FI925356A7 (en) | 1992-11-25 |
| BR9008024A (en) | 1993-07-13 |
| JPH05506634A (en) | 1993-09-30 |
| EP0531285A1 (en) | 1993-03-17 |
| JPH0729710B2 (en) | 1995-04-05 |
| EP0531285B1 (en) | 1994-02-16 |
| WO1991018819A1 (en) | 1991-12-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |