JPH0729710B2 - Clamping head for winding sleeve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a clamping head for a winding sleeve of the type described in the preamble of claim 1.

[Background technology]

The tightening head described above is based on the German patent 1,574,43.
No. 8 is known. This clamping head is used for winding strips such as paper webs, foil webs and the like on a winding sleeve, and also for unwinding from this winding sleeve, in this case for winding or restrained unwinding. In order to transfer the required torque to and from the winding sleeve, a clamping head is clamped in the central, generally circular notch at the end of each sleeve. In this known clamping head, a hexagonal clamping head shaft is provided which is gripped by a segmented clamping head member. The clamping member is in surface contact by its radially inner surface (contact surface) with the six outer surfaces of the clamping head shaft as long as the clamping member is in its (unexpanded) rest position.
In the rest position, the radially outer surface of the clamping member, which will be subsequently abutted in the notch of the winding sleeve, in the rest position, forms a peripheral surface which is usually smaller than the inner diameter of the notch at the end face of the winding sleeve. The tightening member and the tightening head shaft are rotatable with respect to each other. This causes the clamping element to be pressed radially outwardly evenly in its entire length when viewed in the axial direction of the clamping head, so that the outer surface of the clamping element expands into the notch of the winding sleeve. As the web is gradually wound up, the roll diameter and thus the torque transmitted increases. This automatically strengthens the expansion of the tightening member. However, it is not possible immediately to provide the same torque in the opposite direction between the sleeve or roll and the clamping head after the winding or unwinding operation, which occurs as the maximum torque (in the other direction) during the winding operation. In short, the expansion device cannot be released or returned. Therefore, the clamping head must be pulled out of the winding sleeve under strong force in its expanded working position.

A clamping head similar to the clamping head known from DE 1,574,438 is known from DE 2,910,114.
In this case, the difference between them is that in the latter, the clamping member has a cylindrical inner contour instead of being in planar contact with the outer surface of the clamping head shaft by its radially inner plane. The inner contour is provided with a groove extending in the axial direction, and in this case a long pressing member fitted in the groove is provided with an upper surface which is curved radially inwardly convexly and which upper surface is the clamping head. It is to make linear contact with the six outer surfaces of the shaft. In this latter configuration,
The release of the clamping head from the fully wound sleeve takes place with less force than the clamping head known from DE-A-1,574,438.

To remove the winding sleeve from the tightening head,
In particular, in another clamping head arrangement described in DE 2,815,310, it is simpler than a clamping head of the type mentioned at the beginning, which in this other known clamping head arrangement Instead of rotation, axial movement is effected between the clamping head shaft and the clamping member in order to achieve expansion or contraction. For this reason, the sliding surface between the tightening head shaft and the tightening head member is wedge-shaped. An axial stop, which is connected to the fastening member and which abuts the sleeve end face in the fastening member which has not yet been expanded, enables the transmission of a force acting in the axial direction, which causes the fastening member to slide along the fastening head shaft, And, in this case, it is expanded into a notch at the end of the winding sleeve. In this case, the constant expansion distance over the tightening length is related to the magnitude of the pushing force exerted in the axial direction. Upon withdrawal of the clamping head from the winding sleeve, the clamping head shaft is first retracted relative to the clamping member, whereby the clamping member is moved radially inward and the radial compression force is weakened. . In short, in this tightening head configuration, the withdrawal of the tightening head from the winding sleeve is simpler than in a tightening head of the type mentioned at the outset. However, this advantage comes with the disadvantage that the clamping force is only related to the axial force exerted on the clamping head. A high clamping force deforms the winding sleeve, a low clamping force runs the risk of slipping between the winding sleeve and the clamping head as the torque increases. Both of these are inconvenient.

Finally, another clamping head of the type mentioned at the outset is known from DE-OS 3,700,472, in which the clamping head shaft has a polygonal clamping area with a constant cross-section in the axial direction. In addition, it also has a frustoconical clamping area with a circular cross section which tapers in the direction of withdrawal. In this case, the frustoconical clamping area is located in front of the polygonal clamping area of constant cross-section when viewed in the pull-out direction. Both tightening zones arranged one behind the other are arranged such that when the axial force acting on the tightening head or the force acting circumferentially on the tightening head is reduced or completely eliminated, one of the two tightening zones is removed. It still has the purpose of remaining valid. When the clamping head is withdrawn again from the fully wound sleeve, the relative rotation between the clamping head shaft and the clamping member is the same as in the case of the clamping head according to DE 1,574,438. This is because it is difficult to apply a corresponding counter torque to the wound sleeve. in this case,
The frustoconical clamping area acts as an additional obstacle,
This is because the peripheral surface of the frusto-conical surface strongly abuts the corresponding frusto-conical plane of the clamping member. In this known configuration of the clamping area, the radial clamping distance of the clamping member, which is maximally produced by the frustoconical clamping area, is the maximum clamping distance achieved by a polygonal clamping area of constant cross section. It is only guaranteed that one of the two clamping areas is able to transmit the clamping force by itself, ie without the cooperation of the other clamping area.

[Disclosure of Invention]

It is an object of the invention to provide a clamping head of the type mentioned at the beginning such that withdrawal from the winding sleeve is simplified when maintaining a torque-related expansion.

This problem is solved by the features of claim 1.

In the clamping head according to the invention, inter alia, the radial expansion distance is torque-related, so that damage to the winding sleeve as well as slipping of the winding sleeve is avoided,
Nevertheless, it has the advantage that the withdrawal of the clamping head from the winding sleeve is simplified. In short, the advantages of both clamping head arrangements mentioned at the outset are combined with one another without the disadvantages of both.
Furthermore, the tightening head according to claim 1 has the advantage that the axial relative position of the winding sleeve and the tightening head shaft is always exactly defined, which means that the expansion distance This is because it always consists of components with limited movement and limited rotation, and the components with limited movement are always prioritized automatically, i.e. the clamping head necessarily starts to rotate. Before it can be done, it must first be moved in its axial direction. On the other hand, in the second known configuration of the clamping head, the relative position between the clamping member (and thus also the winding sleeve) and the clamping head is forcibly variable and undefined. However, this is generally a disadvantage.

A clamping head with the features of claim 3 is proposed in order for the clamping head according to the invention to achieve a constant expansion distance of the clamping element over its entire working length.

In a particular use case, it is less important that the relative position between the tightening head shaft and the tightening member in the axial direction is always the same, but the extension distance is constant over the working length of the tightening member. As far as it is of great importance, a clamping head according to claim 3 is proposed as a variant of the clamping head according to claim 1.

In a particularly simple manner, a constant extension distance over the working length of the clamping element is obtained by the features of claim 4.

A relatively slight frictional resistance between the clamping head shaft and the clamping member during expansion or contraction is obtained by the features of claim 5. Furthermore, a particularly precisely defined relative position between the clamping head shaft and the clamping member is obtained. Moreover, in addition to the rolling motion between the tightening member and the tightening head shaft, some sliding motion can be performed. The rolling movement is realized in a particularly simple manner by the features of claim 6. A clamping head with the features of claim 7 is proposed in order to obtain an automatic return of the rotational movement between the clamping head shaft and the clamping member after withdrawing the clamping head from the winding sleeve. Practical embodiments for these solutions are advantageously achieved with a clamping head of the type obtained from claims 8 and 9, independent of the features mentioned in claims 1 and 3.

The aforementioned components used according to the invention do not specify any special exceptions in their size, shape, material selection and technical concept, and thus do not limit the selection criteria well known in their respective fields of use. Can be used for

BRIEF DESCRIPTION OF THE DRAWINGS The details, features and advantages of the subject matter of the invention which are apparent from the following description of the accompanying drawings are set forth in, for example, an advantageous embodiment of a clamping head according to the invention. In the drawings: Figures 1a to 1c show a clamping head according to the invention in a rest position, i.e. in a rest position with the clamping member fully retracted inwards, in which case Figure 1a shows a longitudinal section of the clamping head. (FIG. 1b is a cross-sectional view taken along the line Ia-Ia), FIG.
Fig. 1a shows a cross-sectional view of the clamping head according to Fig. 1 (a cross-sectional view along the line Ib-Ib), Fig. 1c shows an end view of the clamping head according to Fig. 1a (viewed in the direction A, ie without the cover); , Showing the same tightening head after the end of the tightening stroke caused by the axial movement (cross-section along line IIa-IIa according to Figure 2b); Figures 2b and 2c show the tightening head in the working position shown in Figure 2a. Figures 3a to 3c are corresponding views of the same clamping head as in Figures 1a to 1c, but in a third working position (winding position, ie winding sleeve). 4a to 4c show the same tightening head in a fourth working position, a winding position having a tightening member fixedly expanded therein;
That is, shown in a working position on the clamping head shaft which is still rotating relative to the clamping member, but which has already been pulled back axially; FIG. 5 shows the same clamping head rotating with the clamping head shaft and vice versa. FIG. 6 shows a schematic end view (seen from A) to show the relative position with respect to a clamping member which is not; FIG. 6 shows a variant embodiment of the clamping head shaft in the same view as in FIG.

[Best Mode for Carrying Out the Invention]

The tightening head, indicated generally by 100 in the drawings, for the winding sleeve 10 comprises a tightening head shaft 20, a sleeve-like member used as a tightening head casing 30, and a tightening member 40. There is.

The take-up sleeve 10 shown in the drawing has a concentric cut-out, which is accessible on the end face side with the end 11, as can be seen in FIGS.
12 and a clamping tube 100 is inserted axially into the tube. Tubular winding sleeves are most often used, but it is also possible in principle to use inwardly closed cylinders with corresponding notches at the ends as winding sleeves.

The tightening head shaft 20 is formed as a six-sided truncated pyramid, the base 21 of which is a plate.
It is fixed at 22. The plate 22 or the clamping head shaft 20 itself is rotatably mounted on the support arm in a known manner and can possibly be driven in a rotational direction about the axial direction B. The clamping head shaft is designed as a collared shaft, i.e. it is supported on one side. The clamping head casing 30 is rotatably mounted with respect to the clamping head shaft base 21 and its free end 23. At the free end of the clamping head shaft is fixed a return device 50, which will be explained further below.

The six clamping surfaces 24 of the clamping head shaft 20 are slightly inclined with respect to the axial direction B and are straight in the direction of extension corresponding to the axial direction; In the direction C of the tightening head circumference (Fig.
1c and FIG. 5) It is concavely curved, and this concave curvature is most noticeable on the narrow side (of the free end 23) of the truncated pyramid, and continuously decreases to zero toward the base 21. Decrease. This is especially clear from FIG.

The six clamping members 40, which are evenly divided on the circumference, consist of a pressing member 41 and a sliding member 42 which are connected to one another in a known manner. Penetration part of each tightening member in the circumferential direction
A spring 44 is guided through 43, which is configured as an opening ring (as is apparent from FIG. 1b) and serves as a return spring acting in the contracting direction. Figure
As is clear from 1a, the sliding member 42 is formed linearly in the axial direction, and as is clear from FIGS. 5 and 6, is framed in a concave shape in the lateral extension (circumferential direction C). The contact surface 45 of the sliding element, which bears against the corresponding clamping surface 24 of the clamping head shaft 20, is therefore cylindrical. In short, the respective contact between the clamping member and the clamping head shaft takes place along one contact line 46 (see FIGS. 5 and 6) -and also the rotation between the clamping head shaft and the clamping member. It is performed regardless of the size of the corner.

The clamping head casing 30 has a cylindrical sliding surface 31 at the base end of the clamping head shaft and a cylindrical sliding surface 32 at the clamping head free end. At the base end, a stopper 33, which is cantilevered like a flange, is integrally connected to the tightening head casing 30, or is fixed to this tightening head casing. The tightening head casing 30 has a first end stop 34 for the end 11 of the winding sleeve 10 as well as a second end stop 35 for the axial movement relative to the tightening head shaft 20. Forming the second end stopper 35
Co-operates with plate 22 (see Figure 2a). The tightening head casing 30 is provided with a vertically long penetrating portion 36, and the tightening member 40 is accommodated inside the penetrating portion and arranged so as to be movable in the radial direction. The end stop 37 limits the maximum possible extension distance of the clamping member 40.

A return device 50 is provided in a conically tapering cover 51, which covers the clamping head casing 30 and
For example, they are fixedly connected by screws not shown in the drawing. A ring-shaped or ring-segment-shaped groove 52 is formed inside the cover 51.
There are provided one spiral spring 53, a stopper 54 fixed to the cover, that is to say also fixed to the casing, and a driving body 55 in the form of a circular ring segment. Transporter 55
Is non-rotatably fixed to the free end of the tightening head shaft 20 via an arm 56 connected thereto.
The entrainment body 55 and the arm 56 are such that they are spring 53 together inside the cover 51 and with respect to the clamping head casing 30.
It is designed to be rotatable against the return action of the. The spring 53 is provided on the clamping head casing 30 and the clamping head shaft 30 as long as the clamping head is on the outside of the winding sleeve or rotation between the clamping head shaft 20 and the clamping head casing 30 has not yet taken place.
20 and 20 are held together in a neutral rotational position, which is the case in the working position according to FIGS. After the next rotation, one spring 53 is tightened and the other spring 53
Are relaxed or, conversely, are tightened. This is clear from Figures 3c and 4c. The energy stored in the compressed or expanded spring is now released again only when the winding sleeve is removed from the clamping head.

From the comparison between FIG. 1a and FIG. 2a, the maximum possible travel distance in the axial direction B between the tightening head shaft 20 and the tightening head casing 30 is comparatively small, and the cover 51 on one side via the driver arm 56. It can be seen that it is limited by the inner surface 57 of the and of the end surface 38 of the clamping head casing 30 on the other side. Tightening surface of the tightening head shaft 20
24 This is related to just a slight taper of each other
The movement-limited extension distance of the fastening member (40) is made relatively small. This is immediately apparent in the comparison of Figures 1a and 2a. In general, when the clamping member 40 is completely past the restricted extension distance (see FIG. 2a), the radially outer pressing surface 47 of the clamping member 40 is located on the inside wall of the winding sleeve 10. You don't even have to come in contact with (even if you can). In this working position, the winding sleeve 10
Between the clamping head 100 and the clamping head 100, but still only a relatively slight frictional connection must be present,
It therefore resists the tensile forces acting on the circumference of the winding sleeve when the clamping head is rotated, on one side between the clamping head casing and the clamping member and on the other side between the clamping head casing and the clamping head shaft. Can be rotated. In such a rotary movement, a combination of a sliding movement and a rolling movement takes place between the fastening head shaft and the fastening member. This is especially clear from FIGS. 5 and 6. This causes the clamping member to expand radially outwards and the winding sleeve.
Fixedly expands into 10 notches 12 (see Figures 3a to 3c).

When attempting to remove the winding sleeve from the clamping head again, an axially outward force is exerted on the clamping head in a known manner. As a result, the tightening head shaft 20 has only a small moving section,
Pulled back from 30. This restores the limited travel distance of the clamping member, which is assisted by the return spring 44. This relatively small contraction distance of the clamping member, already completed in the drawings according to FIGS. 4a to 4c, is sufficient for the clamping head to be pulled out of the winding sleeve 10 with a comparatively small force.

It can be seen from FIGS. 5 and 6 that the extension distances of the fastening member 40 or the sliding member 42 are the same at the front end and the rear end when viewed in the axial direction of the fastening member, which means that the fastening surface 24 is fastened. This is because it has a curved portion that continuously changes along the head shaft. The gradual transition between the maximum bend and the minimum bend along the clamping head shaft causes the sliding member to abut the clamping surface 24 along its entire length. In short, the pressing surface 47 of the tightening member 40
Remain axially parallel in all expanded or contracted positions. The required bend configuration is relatively easy to detect in a mathematical way. A curved portion of the contact surface 45 of the sliding member 42,
In particular, the same effect can be obtained when the radius of curvature is continuously changed along the length of the tightening member 40 or when various curved portions are provided in the tightening head shaft and the tightening member. To be The configurations shown in FIGS. 5 and 6 of course have the advantage of particularly simple controllability.

Code list: 10 …… Winding sleeve 11 …… End 12 …… Notch 20 …… Clamping head shaft 21 …… Base 22 …… Plate 23 …… Free end 24 …… Clamping surface 30 …… Clamping head casing 31 …… Sliding surface 32 …… Sliding surface 33 …… Stopper 34 …… First end stopper 35 …… Second end stopper 36 …… Penetration part 37 …… End stopper 38 …… End surface 40 …… Tightening member 41 …… Pressing member 42 …… Sliding member 43 …… Penetration part 44 …… Spring 45 …… Contact surface 46 …… Contact line 47 …… Pressing surface (outer surface) 50 …… Returning device 51 …… Cover 52 …… Groove 53 …… Swirl spring 54 …… Stopper 55 …… Entrainer 56 …… Arm 57 …… Inside surface 100 …… Tightening head A …… Viewing direction B …… Axial direction C …… Circumferential direction

Claims (10)

[Claims] 1. A clamping head for a winding sleeve, on which a strip, such as a paper web or the like, is wound or unwound, the polygonal clamping head shaft (20). A tightening member (4
0), the tightening member (40) and the tightening head shaft (20) are rotatable relative to each other, and this rotation causes the radial displacement (expansion / contraction distance) of the tightening member (40). ), The tightening head shaft (20) is configured as a truncated pyramid, and the tightening member (40) and the tightening head shaft (20) are relative to each other. It is movable in the axial direction (B), the clamping member (40) on one side being the winding sleeve (1
0), and on the other hand one end stopper (34 and 35) respectively acting in the axial direction (B) for the clamping head shaft (20), or operatively connected thereto. -The tightening distance (expansion / contraction distance) of the tightening member (40) is
A rotation-controlled component and a movement-limited component are provided so that the (second) end stopper (35) reaches the axial end position of the end stopper before reaching the end of the tightening distance. A tightening head for a winding sleeve, characterized in that it consists of 2. A clamping head for a winding sleeve, on which a strip, such as a paper web or the like, is wound or unwound from, a polygonal clamping head shaft (20). A tightening member (4
0), the tightening member (40) and the tightening head shaft (20) are rotatable relative to each other, and this rotation causes the radial displacement (expansion / contraction distance) of the tightening member (40). ), The tightening head shaft (20) is configured as a truncated pyramid, and the tightening member (40) and the tightening head shaft (20) are relative to each other. It is movable in the axial direction (B), the clamping member (40) on one side being the winding sleeve (1
0), and on the other hand one end stopper (34 and 35) respectively acting in the axial direction (B) for the clamping head shaft (20), or operatively connected thereto. -The side of the tightening head shaft (20) (tightening surface 24),
Alternatively, the contact surface (45) of the tightening member (40), or both surfaces that abut against this tightening surface, are curved in the direction (C) of the tightening head peripheral surface, and the degree of this curvature is the axial direction. It is changed almost continuously along (B), whereby the tightening head shaft (20) and the tightening member (4
Clamping head according to claim 1, characterized in that the rotation with respect to 0) results in an equally large expansion / contraction distance along the axially extending (B) length of the clamping member (40). 3. A side surface (tightening surface 24) of the tightening head shaft (20), a contact surface (45) of the tightening member (40), or both of these surfaces are curved in the direction (C) of the circumferential surface of the tightening head. And the degree of this curvature is changed substantially continuously along the axial direction (B), whereby rotation between the tightening head shaft (20) and the tightening member (40) is prevented. The tightening head according to claim 1, wherein the expansion / contraction distance is of the same magnitude along the entire length of the (40) extending in the axial direction (B). 4. The tightening surface (24) is straight at the thick end (base 21) of the tightening head shaft (20) and concavely curved at the thin end (free end 23). The tightening head according to claim 2 or 3, wherein the tightening head is curved or has a concave shape at the thick end and is straight at the thin free end (23). 5. The tightening surface (24) of the tightening head shaft (20), the contact surface (45) of the tightening member (40) belonging to the tightening surface, or both surfaces of the tightening head peripheral surface of the tightening head. In the direction (C), the opposing contact portions of the tightening head shaft (20) with the individual tightening members (40) are configured substantially linearly and at least partly between the tightening head shaft and the individual tightening members. 5. The tightening head according to claim 1, wherein the tightening head is curved so that a rolling motion is performed. 6. The tightening head according to claim 5, wherein the contact surface (45) of the tightening member (40) is formed in a cylindrical shape. 7. At least crimpable by rotation between the tightening member (40) and the clamp head shaft (20) for returning rotation after removing the winding sleeve (10) from the tightening head (10). Clamping head according to any one of claims 1 to 6, having one spring (53). 8. A spiral spring having at least one spring (53) extending substantially in a circumferential direction (C) of a tightening head (100).
The tightening head according to claim 7, wherein 9. A casing part (tightening head casing 30) in which at least one spring (53) is rotatable, in one aspect, with the fastening member (40) with respect to the fastening head shaft (20) and is also particularly movable. Tightening according to claim 7 or 8, which is supported by a stopper (54) fixed to the casing at the other side and is supported on the other side by a carrier (55) fixed to the tightening head shaft (20). head. 10. A tightening member (40) particularly in the through portion (36).
A casing part (clamping head casing 30) movable together with a clamping member (40) in at least one direction with respect to the clamping head shaft. The tightening head described.