DE29915352U1 - Winding reel with step gear - Google Patents

Abstract

The cord to be wound is guided onto the core (30) and its axial position depends upon the angle position of the core. The roller incorporates an eccentric disk (20) located rotatably movably coaxially to the winding core (30) and which has a cylinder surface (23) coaxial to the winding core. In the cylinder surface is an all-round guide groove (24) inclined to the axis of the winding core. A step gear is available, which converts the continuous rotary movement of the winding core into a staged linear movement of the cord guide member. The winding core has a bearing (33) for a driver component movable between rest and engagement positions, preferably an axially movable pin. The eccentric disk has at least one recess (12) in which the driver component secures in the engagement position.

Description

RICHTER, WERDERMANN'&

EUROPEAN PATENT ATTORNEYS · PATENT ATTORNEYS

EUROPEAN TRADEMARK ATTORNEYS

HAMBURG ■ BERLIN

DIPL-ING. JOACHIM RICHTER · BERLIN DIPL.-ING. HANNES GERBAULET · HAMBURG DIPL.-ING. FRANZ WERDERMANN · - 1986

NEW WALL IO
20354 HAMBURG

'S (O4O) 34 OO 45/34 OO 56 TELEFAX (O4O) 35 24 15

KURFÜRSTENDAMM 10719 BERLIN

@ (O3O) 8 8a 74 31 FAX (O3O) 8 82 32 IN COOPERATION WITH MAINITZ & MAINITZ LAWYERS ■ NOTARIES

YOUR SIGN YOUR FILE

OUR SIGN OUR FILE

P 99275 III 3938

HAMBURG 03.09.1999

Applicant Title

SCHULZ, Dieter Winding roller with step gear Description winding roll

The present invention relates to a winding roll with a fixed housing and a winding core rotatably mounted therein for receiving a cord or the like. The invention further relates to a Roman blind, a pleated blind, a Venetian blind, a Venetian blind or another window decoration operated by means of pull cords, consisting of a curtain and a number of pull cords which are attached to the curtain at one end and run to a winding roll.

Winding rolls of the type mentioned above are known, for example, from DE 297 06 686 U1. This utility model shows a Roman blind with several pull cords running vertically across the height of the curtain, which are diverted horizontally at the upper edge of the curtain and wound together onto a winding roll attached to the side. By winding the pull cords onto the winding roll, they are shortened and therefore pull the curtain up by gathering it together. The winding roll consists of a winding core and cheeks arranged on the sides of the winding core. In DE 297 06 686 U1, the winding core and the cheeks are designed in a special way to prevent the pull cords from becoming tangled. The disadvantage here is that the special winding rolls are complex to manufacture and are generally optimized for a certain number and size of pull cords.

A Roman blind with a winding roll of the type described above is also known from EP 0 162 025 A2. The winding roll is provided with grooves, each of which can accommodate one of the pull cords and thus keep them separate from one another. The disadvantage of this is that the grooves are filled by the pull cords after one rotation of the roll and therefore lose their organizing effect for the subsequent rotations of the winding roll.

The state of the art also includes a Roman blind according to CH 325 762. This document discloses a winding roll for pull cords, which has sections on the winding core divided by separating discs, so that the pull cords are kept separate from each other for all revolutions of the roll. Unlike EP 0 162 025 A2, the pull cords cannot become entangled after the first revolution. The disadvantage, however, is that a specially manufactured winding roll is required and the entire arrangement takes up a lot of space.

The invention is based on the object of ensuring, in a winding roll of the type mentioned at the outset, that the cords or the like to be wound are wound up smoothly, without entanglements and evenly and in an orderly manner over the winding core.

This object is solved by the features of claim 1.

Accordingly, the winding roll has, in a known manner, a fixed housing and a winding core rotatably mounted therein for receiving a cord or the like. It is characterized in that an axially movable thread guide member is arranged on the winding roll, through which the cord or the like to be wound is guided onto the winding core and whose axial position depends on the angular position of the winding core.

With such a winding roller, an orderly winding and unwinding of the cords is ensured, since the thread guide member moves in an axial direction according to a structurally predeterminable program and thereby specifies the feed point of the cord to the winding core. This also guarantees that the cord is distributed evenly over the winding core, which prevents tangling and ensures that the winding roller is loaded as gently as possible. The rotational movement of the winding core can be used to drive the axial movement of the thread guide member, which simultaneously

It is ensured that such axial movement only occurs when necessary.

There are various possibilities for implementing the winding roll according to the invention. According to claim 2, the rotational movement of the winding core is converted into an axial displacement movement of the thread guide member preferably with the aid of an eccentric disk. This is mounted coaxially to rotate with the winding core and has a cylindrical surface arranged coaxially with the winding core. A guide groove is arranged in the cylindrical surface, which runs around and is inclined to the axis of the winding core, and the thread guide member engages in the guide groove with a pin for the purpose of axial position displacement.

When the winding roll is in operation, the eccentric disk can rotate with the winding core. This also causes the cylinder surface to rotate, which in turn causes the pin of the thread guide member to be axially displaced from the guide groove in the cylinder surface, since the guide groove is inclined relative to the axis of the winding core. The axial course of the guide groove thus determines the "program" according to which the thread guide member moves axially. In the simplest case, the guide groove runs in a plane (inclined to the axis of the winding core) so that when the eccentric disk makes a full rotation, the thread guide member performs a complete back and forth movement along its axial path of movement. However, other programs are also conceivable in which the thread guide member moves back and forth several times during a full rotation of the eccentric disk.

According to claim 3, a stepping gear is preferably present which converts the continuous rotary movement of the winding core into a step-by-step linear movement of the thread guide member. This means that the rotation of the winding core is not constantly but only in phases transmitted to the thread guide member and leads to its axial displacement. Such a stepping operation has in particular the

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The advantage is that one period of movement (back and forth) of the thread guide member is not necessarily completed after one period of movement (full rotation) of the winding core. The axial movement can therefore be slower than the rotation of the winding core. This leads to a better position and distribution of the cord on the winding core.

If an eccentric disk is present as explained above, the stepping gear according to claim 4 is preferably designed such that during a first rotation angle interval of preferably 60° the eccentric disk is driven along by the rotation of the winding core, while it remains stationary for the rest of the full rotation of the winding core. This means that six full revolutions of the winding core are required to rotate the eccentric disk once through a total of 360°. If the guide groove on the eccentric disk lies in one plane as explained above, one full revolution of the eccentric disk corresponds to a complete axial movement period of the thread guide member. A back and forth movement of the thread guide member therefore requires six full revolutions of the winding core, or in other words, for each full revolution of the winding core the thread guide member moves by one sixth of its total path (back and forth) or one third of its axial movement amplitude (back and forth).

A step drive of the eccentric disc can preferably be realized according to claim 5 in that

a) the winding core has a bearing for a driver element movable between a rest position and an engagement position,

b) the housing has a guide surface on which the driver element slides during rotation of the winding core, wherein at least one offset in the guide surface allows a movement of the

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driver element from the rest position to the engagement position and/or vice versa,

c) the driver element is only coupled to the eccentric disc in the engagement position and thus transmits the rotational movement of the winding core to the eccentric disc.

The driver element, which is preferably an axially movable pin, therefore ensures the phased coupling of the eccentric disk to the winding core. In these coupling phases, the eccentric disk follows the rotational movement of the winding core, while it remains stationary outside of the coupling phases. The number and duration of the coupling phases is determined in a simple manner by the design of the guide surface on the housing, i.e. by the number and angular extent of the offset(s) in this surface. An offset is understood to be an axial projection or recess, depending on the direction in which the driver element must be moved to assume the engagement position. If the angular extent α of the offset is an integer fraction of 360°, e.g. α = 3607η, the movement of the thread guide member has completed its axial movement period after η revolutions of the winding core. The relationship between a complete revolution of the winding core and the corresponding distance travelled by the thread guide link is ultimately reflected in the pattern in which the cord is laid down on the winding core. In this way, the shape and uniformity of this pattern can be influenced.

According to claim 6, the eccentric disc has at least one recess into which the driver element can engage in the engagement position. The engagement of the driver element in a recess ensures a secure coupling of the eccentric disc and the winding core, so that

There is no slippage between these elements as is the case with a friction coupling.

According to claim 7, the eccentric disk has several, preferably six, recesses arranged at equal angular intervals around the axis for the engagement of the driver element. An arrangement of &eegr; equidistant recesses works advantageously together with a guide surface on the housing, which has an offset of length &agr; = 3607&eegr;. Then, during a full revolution of the winding core, the driver element is brought into engagement with a recess in the eccentric disk during an angle of rotation &agr;, i.e. the eccentric disk is rotated further by &agr;. At the end of the rotation, &eegr; recesses in the eccentric disk are again in the same position as at the beginning of the rotation. During the next full revolution of the winding core, there is therefore again a recess in the appropriate position for the driver element to engage.

The invention further relates to a Roman blind, a pleated blind, a Venetian blind, a Venetian blind or another window decoration operated by means of pull cords, consisting of a curtain and a number of pull cords which are attached to the curtain at one end and run to a winding roll, the window decoration being characterized in that the winding roll is designed in the inventive manner described above. Proper and tangled-free winding is particularly important for the pull cords of a window decoration, since the winding roll is usually arranged inaccessible to the user and he or she cannot therefore observe or influence the winding process. It is therefore important that proper and trouble-free winding is nevertheless guaranteed.

In the following, the invention is explained by way of example with reference to the figures. They show

•t ·

Fig. 1 the housing 10 of the winding roll;

Fig. 2 the eccentric disc 20;

Fig. 3 the winding core 30;

Fig. 4 the sprocket 40;

Fig. 5 the cover cap 50;

Fig. 6 the thread guide member 60;

Fig. 7 the pin 70;

Fig. 8 a disc 80;

Fig. 9 is an exploded view of the winding roll;

Fig. 10 a winding roll 100 on a window decoration.

Figure 10 shows an example of the use of the winding roll 100 according to the invention on the Roman blind 90 of a window decoration. Several pull cords 91 run vertically over the height of the curtain, are diverted horizontally at the upper edge of the curtain and are wound together onto a winding roll 100 attached to the side. By winding the pull cords onto the winding roll, they are shortened and therefore pull the curtain up by gathering it together. The winding roll is rotated by a pull chain 92 that runs continuously and is accessible to the user.

With such a winding roll on a window decoration, it is particularly important that the pull cords are laid on the winding core without tangling and as evenly as possible so that the operation of the curtain is not disrupted.

The winding roll 100 according to the invention ensures such trouble-free operation through its special design with a

Thread guide member 60. The structure of the essential parts of the winding roll is shown in an exploded view in Figure 9, with the individual components being shown separately in different views in Figures 1 to 8.

As a fixed element that can be connected to the window decoration, for example, the winding roll initially contains a housing 10. This is shown in Figure 1 in a view from the rear, in a section along the central axis, in a view from the front and in a view from above. A cylindrical bearing 13 can be seen in which the rotating elements of the winding roll are accommodated and whose axis coincides with the axis of rotation of the winding core. Furthermore, hole guides 11 can be seen on the upper edge, through which the cords are guided onto the winding core from the side. The housing 10 also contains two opposing grooves 12 in which the thread guide member 60 can be mounted so that it can move axially (i.e. parallel to the axis of rotation of the winding core 30).

The eccentric disk 20 is arranged coaxially and rotatably on the outside of the cylindrical bearing 13. The eccentric disk 20 is shown in Figure 2 in a front view, in section and in a side view. The structure can be seen with a disk body which has a circular hole 22 in the middle through which the bearing 13 can be guided. Furthermore, six equidistant recesses 21 extend radially on the edge of the hole 22 into which the pin 60 can engage. From the section and the side view of the eccentric disk 20, a cylindrical coaxial surface 23 can be seen which is cut off at an angle with respect to the axis of the eccentric disk. An outward-facing guide groove 24 runs along the edge of this surface 23. The pin 63 of the thread guide member 60 can engage in this guide groove 24, whereby the latter is displaced in the axial direction when the eccentric disk 20 rotates. The extent and sequence of this

Displacement is determined by the surface 23 or the course of the guide groove 24.

The next element arranged on the axis of the winding roll is the actual winding core 30, which is shown in Figure 3 in a view from the front, in section and in a view from the back. It consists of a cylindrical bearing surface 31 on which the cord material comes to rest. This bearing surface 31 is closed off at the sides by cheeks which prevent the cord from slipping. The winding core extends with the core 32 through the hole 22 in the eccentric disk 20 into the cylindrical bearing 13 on the housing 10. Of importance is the recess 33 which is arranged parallel to the axis of the winding core 30 on the inner wall of the bearing surface 31. The pin 70 is mounted in this in such a way that it can move axially backwards and forwards in the recess 33. Due to the spring 71, the pin 70 tends to be pressed out of the recess 33.

Furthermore, the chain wheel 40 is arranged on the axle, which is shown in Figure 4 in a rear view and in section. The pull chain 92 is guided over the chain wheel 40, with which a user can set the winding roll or the winding core in rotation. The chain wheel 40 is coupled to the winding core so that its rotation is transferred to it.

Further elements to complete the winding roll are the cover cap 50 shown in Figure 5 and the disk 80 shown in Figure 8.

The thread guide member 60, which is essential to the invention, is shown in Figure 6 in a view from above, from the side and in section. It engages in the grooves 12 on the housing 10 via the lateral guide rails 62 and is thus mounted so as to be axially displaceable. In this arrangement, a pin 63 protruding from the thread guide member points downwards and can thus be brought into engagement with the guide groove 24 on the eccentric disk 20. The thread guide member then follows the

Position of the guide groove 24. The thread guide member also has a thread opening 61 through which the cords to be wound up are guided. The axial displacement of the thread guide member 60 causes the thread opening 61 and thus the cord to be displaced axially, which leads to the desired uniform winding.

In principle, the eccentric disk 20 could be firmly and permanently coupled to the winding core 30 or the chain wheel 40, so that it would constantly follow their rotation. Preferably, however, the coupling takes place via a stepping gear. This decouples the rotations and displacements in their period and it is particularly not necessary for each full revolution of the winding core to automatically cause a complete back and forth movement of the thread guide member 60.

The indexing gear is essentially implemented by the pin 70, which can engage in the recesses 21 on the eccentric disk 20. The pin 70 slides on the guide surface 15, which is formed by the front side of the bearing 13 on the housing 10. The pin 70 is "normally" pressed so deeply into the bearing 33 on the winding core 30 that its free end does not protrude as far as the recesses 21 on the eccentric disk 20. However, on a section 14 of approximately 60°, the guide surface jumps back in a ramp-like manner by an offset, so that the pin 70 can protrude further from the bearing 33 in this area. In doing so, it engages with a recess 21 on the eccentric disk 20. For the length of the offset 14, the pin thus couples the winding core 30 with the eccentric disk 20, so that the latter is driven over 60° of the full rotation. The pin 70 is then pushed back into its rest position by the "normal" guide surface 15, in which it is not engaged with a recess 21. The eccentric disk 20 therefore does not participate in the further rotation. It is only pushed further by 60° per full rotation of the winding core, whereby the thread guide member 60 can cover a third of its axial movement amplitude. After the

After a full rotation, the pin 70 again reaches the offset 14 and engages in the next recess 21 on the eccentric disc 20 in order to rotate it by a further 60°, and so on.

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Reference number: Housing 10 Hole guides 11 Grooves 12 camp 13 Offset 14 Guide surface 15 Eccentric disc 20 Recess 21 Hole 22 Cylinder surface 23 Guide groove 24 Winding core 30 storage area 31 core 32 deepening 33 Sprocket 40 Cover cap 50 Thread guide link 60 Thread opening 61 Guide rails 62 Pen 63 cone 70 Feather 71 disc 80 Roman blind 90 Pull cords 91 Pull chain 92 winding roll 100

Claims (8)

1. Winding roller ( 100 ) with a fixed housing ( 10 ) and a winding core ( 30 ) rotatably mounted therein for receiving a cord or the like, characterized in that an axially movable thread guide member ( 60 ) is arranged on the winding roller, through which the cord or the like to be wound is guided onto the winding core ( 30 ) and whose axial position depends on the angular position of the winding core. 2. Winding roll according to claim 1, characterized in that it contains an eccentric disk ( 20 ) which is mounted coaxially to rotate with the winding core ( 30 ) and which has a cylindrical surface ( 23 ) arranged coaxially with the winding core, in which a circumferential guide groove ( 24 ) inclined to the axis of the winding core is arranged, and that the thread guide member ( 60 ) engages in the guide groove ( 24 ) with a pin ( 63 ) for the purpose of axial positional displacement. 3. Winding roll according to claim 1 or 2, characterized in that a stepping gear is present which converts the continuous rotary movement of the winding core ( 30 ) into a stepping linear movement of the thread guide member ( 60 ). 4. Winding roll according to claim 2 and 3, characterized in that during a first rotation angle interval of preferably 60° the eccentric disc ( 20 ) is carried along by the rotation of the winding core ( 30 ), while it remains stationary for the rest of the full rotation of the winding core. 5. Winding roll according to claim 4, characterized in that a) the winding core ( 30 ) has a bearing ( 33 ) for a driver element, preferably an axially movable pin ( 70 ), which is movable between a rest position and an engagement position, b) the housing ( 10 ) has a guide surface ( 15 ) on which the driver element ( 70 ) slides during rotation of the winding core, wherein at least one offset ( 14 ) in the guide surface causes a movement of the driver element from the rest position to the engagement position and/or vice versa, c) the driver element ( 70 ) is coupled to the eccentric disc ( 20 ) only in the engagement position and thereby transmits the rotational movement of the winding core to the eccentric disc. 6. Winding roll according to claim 5, characterized in that the eccentric disc ( 20 ) has at least one recess ( 21 ) into which the driver element ( 70 ) can engage in the engagement position. 7. Winding roll according to claim 6, characterized in that the eccentric disc ( 20 ) has several, preferably six, recesses ( 21 ) arranged at equal angular intervals around the axis for the engagement of the driver element ( 70 ). 8. Roman blind, pleated blind, Venetian blind, Venetian blind or other window decoration operated by means of pull cords, consisting of a curtain ( 90 ) and a number of pull cords ( 91 ) which are attached to the curtain at one end and run to a winding roll, characterized in that the winding roll ( 100 ) is designed according to one of claims 1 to 7.