EP0503269B1 - Externally supported cylindrical spreader - Google Patents

Description

The invention relates to a circular spreader held from the outside according to the features of the preamble of patent claim 1.

From the application is on circular spreader bars held from the outside, which acc. DE-PS 37 32 754 are constructed and effective, it is known to arrange a clamping device in the interior between the telescopically displaceable tubes, which on the one hand can be connected firmly to the inner tube and on the other hand can be positively and positively connected to the inside of the outer tube and its clamping mechanism via a connecting element is connected to the upper bearing part of the spreader head part, so that when the pipes are pulled apart, the clamping device is activated in such a way that further pulling apart of the pipes is prevented.

However, such a clamping device has the disadvantage that it is caused by unevenness in the goods, e.g. due to seams, vibrations on the circular spreader occur and the static friction existing between the clamping parts and the inner diameter of the carrier element is temporarily eliminated or at least reduced. Due to this fact, there may be pressure marks in the goods on the fixing rollers of the roller heads, which ultimately presents itself as goods of poor quality. A further disadvantage is that the clamping device is arranged within the telescopic tube and is therefore not accessible for control and maintenance purposes. In the event of damage to the clamping device, the circular spreader must be completely dismantled.

The object of the invention is therefore to provide a circular spreader held from the outside, which firmly locks against technologically-induced vibration or shocks in the predetermined spread position and the spreader is easily accessible for control and maintenance purposes.

The problem is solved by the characterizing features of patent claim 1.

Advantageous developments of the invention emerge from the subclaims.

According to the invention, it is important that, due to the successively arranged, frustoconical notches on the outer circumference of the inner tube and successively arranged, and from the free end of the outer tube, pawls which positively and positively engage in the catches, it is possible to remove the circular spreader from continuously adjust a large diameter to a small diameter and in each diameter position there is a secure locking against a reset in the sense of an increase in diameter.
This takes place in that, on the one hand, the catches of the inner tube and the pawls engage in a ratchet-like manner and thus the adjustment path of the spreader is given in the sense of a reduction in diameter. On the other hand, it is not readily possible, due to the pawls interacting with the non-positive and positive locking, which have the catches with respect to mirrored recesses, that the circular spreader is inadvertently adjusted from a small diameter to a larger diameter. This is completely prevented by the pawls, in contrast to the known clamping device.

To bring about a release of the pawl from the catches, measures are provided, each consisting of a pull rope, which is connected at one end to the pawl, while the other end is guided over a deflection roller, with one in the area of the spreader head on or in Outer tube arranged clamping plate is connected. The clamping plate in turn is connected in the middle to a connecting piece into which a threaded rod is screwed. The threaded rod is connected indirectly via another pull rope or directly to the head part of the spreader. If tension is applied to the first mentioned rope, the pawls are pulled out of the catches by the rope. As a result, the inner tube is axially displaceable in the outer tube and adjustment of the spreader from a larger diameter to a smaller diameter is now possible.
The rotary spreader is now adjusted in that DE-PS 37 32 754 the entire head part can be moved vertically up or down by means of a lifting device.
The threaded rod or the further pulling rope extending the threaded rod connected to an upper bearing part, which is connected to the head part via a length-adjustable connecting element. The connection to the head part is made via a head piece frame.

Fig. 1:

den Rundbreithalter bei maximalem Durchmesser;

Fig. 2:

den Rundbreithalter bei minimalem Durchmesser;

Fig.3:

den zentralen Träger des Rundbreithalters mit der Sperrvorrichtung in geschlossener Stellung gem. Detail "A" und in geöffneter Stellung gem. Detail "B";

Fig. 4:

das Detail"B" der Sperrvorrichtung gem. Fig. 3;

Fig. 5:

das Detail "A" der Sperrvorrichtung gem. Fig. 3;

Fig. 6:

einen Schnitt A-A gem. Fig. 5 bei geschlossener Sperrvorrichtung mit den Vorkehrungen für die Sperrklinken ;

Fig. 7:

die Seitenansicht des Kopfteiles gem. Detail "Y" in Fig. 1 bei geschlossener Sperrvorrichtung;

Fig. 8:

die Ansicht "C" des Kopfteiles nach Fig. 7 gem. Pfeilrichtung "C" ;

Fig. 9:

die Seitenansicht des Kopfteiles gem. Detail "Y" in Fig.1 bei geöffneter Sperrvorrichtung ;

Fig. 10:

die Ansicht "D" des Kopfteiles nach Fig. 9 gem. Pfeilrichtung "D";

The invention will now be described in more detail using an exemplary embodiment. Here show:

Fig. 1:

the circular spreader with maximum diameter;

Fig. 2:

the circular spreader with a minimal diameter;

Fig. 3:

the central support of the spreader with the locking device in the closed position acc. Detail "A" and in the open position acc. Detail "B";

Fig. 4:

the detail "B" of the locking device acc. Fig. 3;

Fig. 5:

the detail "A" of the locking device acc. Fig. 3;

Fig. 6:

a section AA acc. Figure 5 with the locking device closed with the arrangements for the pawls.

Fig. 7:

the side view of the headboard acc. Detail "Y" in Figure 1 with the locking device closed;

Fig. 8:

the view "C" of the head part of FIG. 7 acc. Arrow direction "C";

Fig. 9:

the side view of the headboard acc. Detail "Y" in Figure 1 with the locking device open;

Fig. 10:

the view "D" of the head part of FIG. 9 acc. Arrow direction "D";

As shown in FIGS. 1 to 5, the circular spreader 1 consists of two telescopically movable support elements, each support element being designed as a tube 2, 3 and the tube 3 with a smaller outside diameter than the inside diameter of the tube 2 into the tube 2 is inserted.
The tube 3 is gem. Fig. 1 connected at its lower part to a floating body 4. On the outer circumference of the tube 3, starting at the free end, successively arranged, frustoconical notches 5 are introduced. Pawls 6 engage in these catches 5 and connect the catches 6 with the catches 5 in a non-positive and positive manner via tension springs 7.
The catches 5 themselves are arranged on a length of the tube 3 which is at least equivalent to the extent of the maximum width adjustment of the rotary spreader 1.
From Fig. 3 it is clear that each of the pawls 6 is pivotally connected to an arm 8 rigidly connected to the free end of the tube 2 about a pivot point 9. Each arm 8 receives a rotatably mounted deflection roller 10 at its free end.
The arms 8 carrying the respective pawl 6 are arranged in the direction of the floating body 4 of the circular spreader at an acute angle to the longitudinal axis 20 of the tube 2.
At the same time, the arms 8 are connected to the outer circumference of the tube 2, offset from one another by 180 °.
It is of course conceivable that further arms 8 and thus further pawls 6, which are preferably arranged at 90 ° to one another, can be brought into engagement with the catches 5. Such an arrangement would contribute to a more symmetrical distribution of force on the catches 5.

On the wide sides of the pawls 6, as can be seen in FIGS. 4 to 6, a pull arm 11 is fixedly arranged on the pawl 6, the length of which is greater than the radius of the tube 3. The opposite free ends of the pull arms 11 are included a tension spring 7 connected. This spring ensures that the pawls 6, which have recesses 12 designed as mirror images of the catches 5, are permanently connected to the catches 5 in a positive and non-positive manner.

At the lower end of each pawl 6 opposite the articulation point 9, one end of a traction cable 13 leading over the respective deflection roller 10 is firmly connected to the pawl 6.
The other end of each traction cable 13 is connected to a tension screw 14, which in an in the upper region of the outer tube 2, near the head part 15 of the Circular spreader arranged clamping plate 16 is received and secured by nut 17 and lock nut 18. The clamping plate 16 is arranged in a wide slot-shaped recess 19 in the tube wall in the direction of arrow 36 to be raised. For this purpose, the clamping plate 16 is centrally connected to an intermediate piece 21 which is screwed to a threaded rod 22.
The threaded rod 22 in turn is directly or indirectly connected to the head part 15 of the spreader 1 via a pull rope 23 (FIG. 7).
To limit the pivoting movement of the pawl 6 during the unlocking of the tube 3, locking screws 24 which can be locked are provided on the arms 8.

As can also be seen in FIGS. 1 and 2, the structural design of the rotary spreader 1 is determined by the fact that there are articulation points 25 for support arms 26 on the outer sides of the tubes 2 and 3, each support arm 26 on the one hand with the articulation point 25 and on the other hand, is articulated to radially outer roller segments 27. The goods 28 run over the outside of the roller segments 27 and either run from bottom to top in FIG. 1; which, however, can run from top to bottom over the circular spreader in other embodiments.

The upper end face of the outer tube 2 is connected to a plate 29, which plate itself is firmly connected to the head part 15.
The head part 15 consists essentially of. 7 to 9 from a head frame 30, on which the support rollers 31 are rotatably mounted, an upper bearing part 33 being arranged on this head frame 30 via a length-adjustable connecting element 32, on which counter rollers 34 are rotatably mounted.
The fixing rollers 35 are concave. They are held in the head part 15 in that the rollers 31, 34 are convex and create a receiving space between them, in which the fixing rollers 35 engage in a positive manner and are held thereby.
In a manner not shown here, the fixing rollers 35 are rotatably mounted on a shaft in the sense of the description of the German patent 37 32 754, which shaft is in each case connected at the end to a frame part, which in turn is attached to lifting spindles, so that this entire frame part is together with the fixing rollers 35 in the longitudinal direction of the rotary spreader on and is adjustable from adjustable.

By adjusting the entire frame part in the arrow directions 36, 37, the entire head part 15 is thus also moved in the same arrow directions 36, 37 in the longitudinal direction of the rotary spreader 1. This means that the diameter of the rotary spreader is adjusted.

The unlocking of the tube 3 will now be explained in more detail with reference to FIGS. 3 and 5. If a tensile force is exerted on the threaded rod 22 in the direction of the arrow 36, the pawls 6 are then positively and non-positively connected via the tensioning plate 16, the respective traction cable 13, which is guided over the respective deflection pulley 10, from the pawl 6 between the pawls 6 and the catches 5 Connection loosened and pivoted outwards to the limit screws. At the same time, the tension springs 7 connecting the pawls 6 are tensioned. The unlocking is maintained as long as a tensile force acts on the threaded rod 22.

The following explains how the pull cable 23 connected to the other end of the threaded rod 22 is connected to the head part 15 and interacts.

The pull rope 23 extends through the head frame 30 and is attached to one end of the length-adjustable connecting element 32. The further details of the construction of this length-adjustable connecting element are shown in FIGS. 8 and 10.

There is a plate 38 which is part of the bearing part 33. The bearing part 33 consists essentially of a U-shaped frame which has said plate 38 as a U-base leg. The counter rollers 34 are rotatably mounted in the profile of this bearing part 33.
On the other hand, the lower head frame 30 also consists of an essentially U-shaped part, in the inner profile of which the support rollers 31 are rotatably mounted. The base leg of this head frame 30 is formed by a stop web 39.
The connection between the plate 38 and the stop web 39 now takes place via said length-adjustable connecting element 32.
It essentially consists of two spaced parallel ones Guide bolts 40, which on the one hand pass through a through hole 41 in the upper plate 38 and on the other hand are welded with their bolt-side end in the stop web 39 of the lower head frame 30.
By adjusting the nuts 42 on the guide pin 40, the distance between the plate 38 and the stop web 39 can be adjusted. The upper end of the pull cable 23 is firmly connected to the bolt-side end of the threaded bolt 43, this threaded bolt engaging through a through hole 44 in the lower stop web 39.
The threaded bolt 43 is fixed via nuts 45 in a through hole 46 in the upper plate 38.
By adjusting the nuts 45 on the threaded bolt 43, the tension of the pull rope 23 can be adjusted.

The guide columns for the goods 28 in the upper head part 15 will now be described in more detail with reference to FIGS. 7 and 9.

This results in the essential advantages of the locking device according to the invention, which prevents the fixing roller 35 from inadmissibly contacting the running surface of the support roller 31 and thus squeezing the goods 28 together.

According to the invention, the locking device described above provides that a precisely defined gap 48 is always maintained between the rollers mentioned.

For drawing reasons, this gap 48 has been drawn in FIG. 7 as going towards zero. However, this does not correspond to the actual situation; in fact, this gap 48 is always approximately broad according to the thickness of the goods 28. This means that a defined distance between the rollers is described, and this also prevents inadmissible pinching of sensitive goods.
In the displacement position, there is a relatively large gap between the running surface of the fixing roller 35 and the associated convex running surface of the support roller 31.
In this position, the rope 23 is tensioned and the running surfaces of the counter-rollers 34, which are also convex, lie on the associated running surfaces of the Fuser rollers 35 on.
In this position, the entire head part 15 is moved upward, with tensile force being exerted on the pull cable 23 and the locking device opening. As a result, the telescopically pushed tubes 2, 3 can be easily pulled apart.
As soon as the end of the displacement movement has been reached, the displacement drive for shifting the fixing rollers 35 in the arrow direction 36 upwards is briefly switched over, so that the entire drive is briefly driven downwards in the arrow direction 37, whereby the connecting element 32 is moved together by the distance 47. The distance 47 in FIG. 9 therefore goes to zero, as in
Fig. 7 shown, so that now the locking device according to its locking position. Fig. 5 occupies.
Due to the distance setting with the threaded bolts 40 and the associated threaded nuts 42, a precisely defined distance between the plate 38 and the stop web 39 is now set, so that this ensures that there is a precisely defined gap 48 between the running surface of the fixing roller 35 and the running surface the support roller 31 results.
As a result, an unauthorized jamming of the goods 28 is prevented even with the strongest counter forces on the support arms.
The defined gap 48 is therefore always maintained because in this position the locking device has already started to operate.
If a pulling force is now exerted radially inwards from the goods 28 onto the support arms 26, the gap 48 can still not be reduced further, because in this position the locking of the tube 3 according to FIG. Fig. 5 is done.

FIGS. 8 and 10 show further guide rollers 49 which are rotatably fastened to the stop web 39 and thus to the head frame 30. These guide rollers 49 have the task of avoiding an inadmissible twisting of the goods when they run over the rotary spreader. So they form side stops for the goods 28th

Claims (7)

1. Externally supported circular expander for tubular textile products, having a central carrier (T) for a plurality of supports (26) which are distributed over the periphery of the expander and can be radially spread out and adjusted, and on which, in the direction of travel of the tubular product (28), there are disposed longitudinal elements (27) for conducting the tubular product (28), wherein

   a) the central carrier (T) of the expander is subdivided into two tubes (2,3) which may be displaced in relation to one another in a telescope-like manner in the longitudinal direction, and the supports (26), which may be spread out, are articulated on the tubes (2,3) and form a connection to the longitudinal elements (27) which are together associated with the two tubes (2,3), the supports (26) respectively associated with the two tubes (2,3) having an inclination opposite to one another,

   b) the expander is equipped at its two ends with, in each case, a pair of support rollers (31), abutting on locating roller pairs (35) disposed outside the tubular product (28), the support roller pair tensioning the expander between these locating roller pairs, wherein means cooperating with the central carrier (T) render possible a continuous adjustment of the circular expander up to a maximum diameter and simultaneously prevent an unintentional resetting of the expander diameter,

   characterised in that the means comprise detents (6) which have recesses (12) and are pivotably disposed at the free end of the tube (2), and catches (5) in the outer periphery of the tube (3), the recesses (12) of the detents (6) being brought into operative connection with the catches (5), thus ensuring locking and unlocking of the tubes (2,3).
2. Circular expander according to Claim 1, characterised in that the catches (5) are disposed on a length of the tube (3) which is at least equivalent to the dimension of the maximum width displacement of the expander 1.
3. Circular expander according to Claim 1, characterised in that the detents (6) are articulated on a bearing arm (8), which is rigidly connected to the free end of the tube (2) and which accommodates, at its free end, a rotatably mounted deflector roller (10).
4. Circular expander according to Claim 3, characterised in that the bearing arms (8) point in the direction of a floating body (4) connected to the tube (3) and are disposed at an acute angle α to the longitudinal axis (20) of the tube (2).
5. Circular expander according to Claim 1 characterised in that the detents (6) have recesses (12) which correspond to the catches (5).
6. Circular expander according to Claim 1, characterised in that the detents (6) are equipped with a draw arm (11), provided on either side of each detent (6), and the draw arms (11) are connected to one another via a draw spring (7).
7. Circular expander according to Claim 1, characterised in that the means provided to effect the unlocking of the tube (3) comprise, in each case, a draw cable (13) which is connected to each detent (6) and guided via a respective deflector roller (10), and a clamping plate (16) connected to the upper bearing part of the headpiece (15) via an intermediate part (21), and via a threaded rod (22).

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