GB2285636A

GB2285636A - Locating wound textile bobbin after doffing

Info

Publication number: GB2285636A
Application number: GB9423894A
Authority: GB
Inventors: Klaus Bartkowiak
Original assignee: Barmag AG; Barmag Barmer Maschinenfabrik AG
Current assignee: Oerlikon Barmag AG
Priority date: 1993-12-27
Filing date: 1994-11-25
Publication date: 1995-07-19
Anticipated expiration: 2014-11-25
Also published as: ITMI942091A1; JPH07206268A; KR950017700A; DE4444792B4; GB2285636B; GB9423894D0; ITMI942091A0; DE4444792A1; JP3549599B2; TW276277B; KR100306713B1; IT1270658B

Abstract

Wound textile bobbins 4, 13 roll successively from a winding device down inclined path 1 comprising rails 2, 3 to a collecting position at stops 6.2, 6.3. Bobbin 4 pivots lever arms 20 about pins 7 so that lever arms 21 stop next bobbin 13 to prevent collision. Levers 20, 21 may be spring biased to move lever arms 21 apart. The free ends of arms 21 may be bevelled to center bobbins. An arm 20 may be relieved to allow a collector to enter spool 5. Removal of bobbin 4 allows bobbin 13 to roll to the stops. <IMAGE>

Description

Textile machine with blocking device The invention relates to a textile machine having a wind-on device for bobbins or formers, an inclined roll-off path, a stop at the end of the roll-off path and a blocking device, wherein: each finished bobbin rolls along the rolloff path associated with the wind-on device as far as a stop; this stop is situated at the end of the roll-off path and defines a collecting position for the finished bobbin, the blocking device comprises a presence sensor and a blocking element; the presence sensor is situated in the collecting position and, when a bobbin is present, releases the blocking element; the blocking element is disposed, in the roll-off direction, before the collecting position, such that rolling of a further bobbin is prevented.

Such a textile machine is known from DE-A 41 21 325.

In this machine, each completely wound bobbin is deposited on a roll-off path. The bobbin then rolls into a collecting position, from which it has to be collected before the next new bobbin may follow. This entails the drawback that the production sequence is linked to collection of the wound bobbin and so non-collection of the wound bobbin may hold up the entire production sequence.

The object of the invention is to construct the textile machine in such a way that a plurality of completely wound bobbins may be deposited on the roll-off path.

Accordingly, the invention provides a textile machine having a wind-on device for bobbins or formers, an inclined roll-off path, a stop at the end of the roll-off path and a blocking device, wherein: each finished bobbin rolls along the roll-off path associated with the wind-on device as far as a stop; this stop is situated at the end of the roll-off path and defines a collecting position for the finished bobbin; the blocking device comprises a presence sensor and a blocking element; the presence sensor is situated in the collecting position and, when a bobbin is present, releases the blocking element; the blocking element is disposed in the roll-off direction in front of the collecting position, such that rolling of a further bobbin is prevented; the presence sensor takes the form of a first arm and the blocking element takes the form of a second arm of a pivoted lever capable of swivelling; the swivelling axis of the pivoted lever is aligned substantially at right angles to the plane of the roll-off path; and the swivelling axis is disposed and the pivoted lever is constructed in such a way that the first arm is directed in the roll-off direction and rests against the end face of the bobbin or former situated in the collecting position, while the second arm is directed counter to the roll-off direction and projects into the roll-off path of a subsequent bobbin or former.

The solution has the advantage that all that is required for storing a plurality of bobbins on the roll-off path is one very simple device which is not externally controlled. As a result, the textile machine may be equipped with a transport system for collecting the wound bobbins which does not attend and clear each roll-off path individually when there is a full bobbin, but minds a plurality of roll-off paths situated alongside and above one another. The result is on the one hand a simplification of the transport system but on the other hand also a substantial reduction in transport frequency, with the result that the operating gangway remains clear for other, in particular manual, machine attendance and maintenance tasks.

Preferably, the invention also provides a textile machine, wherein the second arm has, on its end, an inclined blocking edge which projects into the roll-off path in the region of the circumferential edge arising between the end face and the convex surface of the subsequent bobbin or former.

This gives the advantage that, upon opening of the blocking element, a bobbin resting against the blocking edge does not have to be pushed by the blocking arm counter to the roll-off direction, i.e. up the inclined roll-off path.

If the blocking element is of a self-locking design, a spring which releases this self-locking, or some other force generator, is needed to open the blocking arm. Selflocking means that the bobbin itself cannot open the lever since it does not exert any torque upon the lever in an opening direction. A particularly simple design for the blocking element, which requires no springs or other force generators, arises from a further feature of the invention, in which the blocking edge is so inclined relative to the roll-off direction and the surface of the blocking edge is such that there is no self-locking between it and the adjacent circumferential edge of a bobbin or former.

Experience has shown that, occasionally, play in the longitudinal direction of the bobbin - between the end face of the former and the guide edge of the roll-off path - may lead to tilting of the bobbin deposited in front of the pivoted lever according to the invention. This drawback is eliminated by a preferred feature of the invention such that a blocking device is positioned on the left and another on the right of the roll-off path, the blocking edges facing in a funnel-like manner towards each bobbin which rolls off.

Since the formers usually vary slightly in length, the width of the roll-off path has to be geared to the maximum former length. As they roll off, the bobbins may therefore encounter the blocking edge of the pivoted lever with varying degrees of axial offset and may tilt as a result.

This drawback is avoided by a further preferred feature of the invention whereby each blocking edge comprises a subregion with a centring bevel and an adjoining sub-region with a braking bevel, the centring bevel being at a more acute angle to the roll-off direction than the braking bevel.

Another preferred embodiment of the invention provides that the braking bevel is so inclined relative to the rolloff direction and the surface of the braking bevel is such that there is no self-locking relative to the adjacent circumferential edge of a bobbin or former. By virtue of this, it is possible for a bobbin which is resting against the braking bevel, upon removal of the bobbin in the collecting position and consequent release of the blocking element, to open the blocking element solely by virtue of its weight, i.e. no springs or other force generators are required for opening.

If the blocking edge and the braking bevel are of a non-self-locking design, thereby making it possible to dispense with springs or other force generators, and these force generators are actually dispensed with, the non-selflocking construction of the invention, besides being of a simple design, offers the added advantage that the bobbin which releases the blocking element need have virtually no minimum weight: the design as a double-armed pivoted lever means that a force which opens the second arm simultaneously acts in a closing manner upon the first arm.

Since the bobbins roll off solely by virtue of the force due to weight acting upon them, this force in the case of use of a restoring spring or some other force generator has to be great enough to be able to push the first arm outwards counter to the force exerted by the restoring spring or the force generator.

This is not a problem so long as bobbins of approximately the same weight are to be deposited on the same roll-off path (normal conditions). In the special case, however, where bobbins of differing weight are deposited on one and the same roll-off path, a self-locking design of the blocking element may lead to the problem where, on the one hand, the force opening the blocking element has to be great enough to be able to push the second arm outwards even when a heavy bobbin is resting against the blocking edge or the braking bevel, but this force then, on the other hand, also acts upon the first arm so that a very lightweight bobbin might no longer be able to push the first arm outwards. Conversely, if the spring or other force generator producing the force for opening the blocking element is selected in such a way that even a lightweight bobbin may push the first arm outwards, the force is occasionally not great enough to open the second arm in the case of a very heavy bobbin resting against the blocking edge or the braking bevel. The non-self-locking design of blocking edge and braking bevel solves this problem.

Further details, features and advantages of the invention are indicated in the following detailed description and the accompanying drawings, in which various preferred embodiments of parts of a textile machine constructed according to the invention are illustrated.

The drawings show: Fig.1 the plan view of a roll-off path, with a first bobbin rolling off; Fig.la the same roll-off path, with a first bobbin in the collecting position and a second bobbin in front of the blocking edge; Fig.2 the same roll-off path as in Fig.l but with a pivoted lever without force generators; Fig.2a a detail from Fig.2; Fig.3 the side view of the roll-off path according to Fig.2; Fig.4 the plan view of the same roll-off path as in Fig.l but having a pivoted lever with a centring bevel and no force generators; Fig.4a a detail from Fig.4.

Figures 1 to 4 show details of a textile machine according to the invention, having an inclined roll-off path 1, associated with a wind-on device (not shown) and formed by a left guide rail 2 and a right guide rail 3.

Parts of this roll-off path 1 are also shown. At this textile machine, the wind-on device winds bobbins 4, 13 on formers 5, 14. The cross-winding travel with which these bobbins 4, 13 are wound is smaller then the length of the formers 5, 14, and the centre of the cross-winding travel coincides with the centre of the formers 5, 14 so that the formers 5, 14 protrude in an axial direction from the bobbins 4, 13. The resultant clear, i.e. non-wound, lateral area of the former is utilized as a supporting surface of the formers 5, 14 on the guide rails 2, 3 of the inclined roll-off path 1.

The wind-on device deposits the bobbins 4, 13 on the inclined roll-off path 1 in such a way that only the nonwound ends of the formers 5, 14 rest on the guide rails 2, 3. Between the guide rails 2, 3 there is an empty space, whose size is geared to the length of the cross-winding travel and the diameter of the bobbins to be deposited.

The finished bobbins 4, 13 then roll along the inclined roll-off path 1 solely by virtue of its weight.

Situated at the end of each guide rail 2, 3 are stops 6.2, 6.3, which define the end of the roll-off path 1 and hence a collecting position for the bobbins. The finished bobbins are to be manually or automatically collected from this collecting position.

If only one bobbin at a time could be deposited on the roll-off path 1, the production sequence of the textile machine would be linked to collection of the finished bobbin and non-collection of the finished bobbin would hold up the entire production sequence.

In the textile machine of Fig. 1, the length of the roll-off path 1 is great enough to enable at least two finished bobbins to be deposited. It is however important to prevent two bobbins 4, 13 deposited in succession on the same roll-off path 1 from rolling one on top of the other, since a collision of the bobbins 4, 13 may lead to impairment of the quality of the bobbins 4, 13.

In a textile machine constructed according to the invention, such collision is avoided by a blocking device in the form of a double-armed pivoted lever 8, 15, 19.

This pivoted lever 8, 15, 19 is supported so as to be capable of swivelling on a pin 7 disposed alongside the roll-off path. The first arm 9, 16, 20 - directed in the roll-off direction - of the pivoted lever 8, 15, 19 is hereinafter always referred to as the sensor arm. The second arm 10, 17, 21 - directed counter to the roll-off direction - of the pivoted lever 8, 15, 19 is referred to as the blocking arm. The position of the pivoted lever 8, 15, 19, in which the end of the blocking arm 10, 17, 21 does not project into the roll-off path 1, is referred to as the basic position and is defined by a stop 11 disposed to one side of the roll-off path 1.

Fig.l shows the plan view of the inclined roll-off path 1, with a first bobbin 4 rolling off. In this embodiment, pivoted levers 8 are arranged mirrorsymmetrically, one on the left and one on the right of the roll-off path. In the illustrated embodiment, each pivoted lever 8 is biassed by a restoring spring 12 into the basic position, the basic position being understood as the position of the pivoted levers 8, in which the blocking arms 10 of the pivoted levers 8 do not project into the roll-off path and which is defined by a stop 11 or - in the case of use of two pivoted levers - two stops 11, one on the left and one on the right of the roll-off path, for the pivoted levers 8. In the basic position of the pivoted levers 8, the bobbin 4 may roll unimpeded as far as the stops 6.2, 6.3 situated at the end of the guide rails 2, 3.

In this position, the bobbin pushes apart the sensor arms 9 of each pivoted lever 8, this being shown in Fig.la.

Fig.la shows the same roll-off path as in Fig.l, with a first bobbin 4 in the collecting position and a second bobbin 13 in front of the blocking edge. The first bobbin 4 lying at the end of the roll-off path defined by the stops 6.2, 6.3 situated on the guide rails 2, 3 pushes the sensor arms 9 of the pivoted levers 8 apart with the end faces of its former 5, with the result that the blocking arms 10 of the pivoted levers 8 project into the roll-off path 1 in such a way that the former 14 of the second bobbin 13 comes into contact with the blocking arms 10, which thus prevent the second bobbin from rolling any further. In the illustrated embodiment, if the first bobbin 4 were to be removed from the roll-off path 1, the restoring springs 12, by pressing upon the sensor arms 9, would open the blocking arms 10 and the bobbin 14 could then roll as far as the stops 6.2, 6.3.

The same roll-off path as in Fig.1 but with a nonself-locking pivoted lever 15 without force generators is shown in Fig.2 in plan view and in Fig.3 in side view.

Fig.2a is a detail view of a pivoted lever. The difference between these Figures and Figures 1 and la described above lies in the use of the double-armed pivoted lever 15, which comprises the sensor arm 16 and the blocking arm 17 and is supported so as to be capable of swivelling on the pin 7 as already mentioned. In the embodiment shown here, the blocking edge of the blocking arm 17 is of a non-selflocking design. This non-self-locking design of the blocking edge of the blocking arm 17 makes it possible, as described above, to dispense with a restoring spring.

When the bobbin 4 lying in the collecting position defined by the stops 6.2, 6.3 is manually or preferably automatically collected, the hitherto blocked bobbin 13 may push the blocking arms 17 outwards solely by virtue of the force due to its weight. The pivoted arms 15, supported so as to be easily capable of swivelling, thus receive a rotational force. Since, in an advantageous application of the invention, a plurality of roll-off paths are disposed alongside one another, the blocking arms 17, after receiving the rotational force, are prevented by the stops 11 from rotating to an unlimited extent and possibly getting in the way of the blocking arms of adjacent rolloff paths.

The side view (Fig.3) reveals that there is provided in the upper edge of the sensor arm 16 a substantially semicircular recess 18, whose diametral centre coincides with the centre of the end face of the former 5 resting against the stop 6.3. This recess 18 in the sensor arm 16 allows free access to the interior of the former 5 so that a suitable collecting device, e.g. having a mandrel, may travel into the former 5 and remove the bobbin 4 from the described collecting position.

The same roll-off path as in Fig.l but with a nonself-locking pivoted lever 19 without force generators is shown in Fig.4 in plan view. Fig.4a is a detail view of pivoted lever 19. The difference between this pivoted lever and the non-self-locking pivoted lever 15 described above and shown in Figures 2, 2a and 3 lies in the construction of the blocking edge of the blocking arm 21.

The blocking edge here comprises a sub-region with a braking bevel 22 and a sub-region with a centring bevel 23. The pivoted lever 19 again comprises a sensor arm 20 and a blocking arm 21 and is supported so as to be capable of swivelling on the pin 7 already mentioned.

Since the formers usually vary slightly in length, the width of the roll-off path 1 has to be geared to the maximum occurring former length. As they roll off, the bobbins may therefore encounter the braking bevel 22 with varying degrees of axial offset and may tilt as a result.

If the two formers 5, 14 are among the - compared to the average - shorter formers and the bottom former 5 lies, for example, in an axial direction over to the left on the guide rail 2, and the next bobbin 14 rolls over to the left along the roll-off path 1 and then first encounters the left blocking arm which projects farther into the roll-off path 1, this second former 14 could twist relative to the roll-off direction and become jammed between the guide rails 2, 3. This drawback is avoided by the presence of the centring bevel 23.

Claims

1. A textile machine having a wind-on device for bobbins or formers, an inclined roll-off path, a stop at the end of the roll-off path and a blocking device, wherein: - each finished bobbin rolls along the roll-off path associated with the wind-on device as far as a stop, - this stop is situated at the end of the roll-off path and defines a collecting position for the finished bobbin, - the blocking device comprises a presence sensor and a blocking element, - the presence sensor is situated in the collecting position and, when a bobbin is present, releases the blocking element, - the blocking element is disposed, in the roll-off direction, before the collecting position, such that rolling of a further bobbin is prevented, - the presence sensor takes the form of a first arm and the blocking element takes the form of a second arm of a pivoted lever capable of swivelling, - the swivelling axis of the pivoted lever is aligned substantially at right angles to the plane of the roll-off path, and - the swivelling axis is disposed and the pivoted lever is constructed in such a way that the first arm is directed in the roll-off direction and rests against the end face of the bobbin or former situated in the collecting position, while the second arm is directed counter to the roll off direction and projects into the roll-off path of a subsequent bobbin or former.

2. A textile machine as claimed in claim 1, wherein the second arm has, on its end, an inclined blocking edge which projects into the roll-off path in the region of the circumferential edge arising between the end face and the convex surface of the subsequent bobbin or former.

3. A textile machine as claimed in claim 2, wherein the blocking edge is so inclined relative to the roll off direction and the surface of the blocking edge is such that there is no self-locking between it and the adjacent circumferential edge of a bobbin or former.

4. A textile machine as claimed in claim 2 or 3, wherein a blocking device is disposed on the left and another on the right of the roll-off path, the blocking edges facing in a funnel-like manner towards each bobbin which rolls off.

5. A textile machine as claimed in any of the preceding claims 2 to 4, wherein each blocking edge comprises a sub-region with a centring bevel and an adjoining sub-region with a braking bevel, the centring bevel being at a more acute angle to the roll-off direction than the braking bevel.

6. A textile machine as claimed in claim 5, wherein the braking bevel is so inclined relative to the roll off direction and the surface of the braking bevel is such that there is no self-locking between it and the adjacent circumferential edge of a bobbin or former.

7. A textile machine substantially as described herein with reference to Figures 1 - 4a of the accompanying drawings.