EP3730682A1 - Support device for an apron drafting machine - Google Patents

Abstract

The invention relates to an apron drafting device for a spinning machine and a support device for an apron drafting device of a spinning machine, with a first and a second support, each of which is designed to detachably accommodate an apron bridge and / or to rotatably support a drafting roller. In order to provide a support device for an apron drafting device and a apron drafting device of a spinning machine, which enable a quick change of an apron, it is provided that, in the case of the supporting device, the first support has a base element and a guide section which is detachably connected to the base element and has a bearing opening for the rotatable mounting of the drafting roller and having a first receiving opening for receiving a first bearing section of the apron bridge.

Description

The invention relates to a support device for an apron drafting system of a spinning machine, with a first and a second support, each of which is designed to detachably receive an apron bridge and / or to rotatably support a drafting roller.

Drafting systems for spinning machines are known in a wide variety of configurations from the prior art. They are used to stretch or distort a sliver, which results in a cross-sectional reduction of the fiber. During the warping, the fibers must be transported next to one another as evenly as possible in order to achieve a uniform sliver, which is a prerequisite for the production of a uniform yarn.

For drawing the fiber sliver, the drafting devices generally have a plurality of roller pairs arranged one after the other, which, arranged adjacent to one another, clamp the fiber sliver running between them. A pair of rollers usually consists of a driven lower roller and an upper pressure roller resting on the lower roller. A distortion of the sliver is achieved in that in the direction of transport of the sliver determined by the direction of rotation of the roller pairs, the peripheral speed increases from roller pair to roller pair.

The individual driven rollers are each arranged on a supporting device, in particular a drafting device carriage, which, arranged one behind the other in the transport direction of the sliver, form a drafting device lower part of a drafting device. After the fibers of the fiber composite lose their cohesion in the main drafting zone, in which the sliver is drawn at high draft values, it is known to design the drafting units as apron drafting units in which the fiber sliver is guided between the clamping lines of the drafting roller pairs by aprons. So-called double apron drafting units are particularly widespread, in which, in the area of the main drafting zone, an apron is guided around a first upper and lower roller, which is deflected towards the second pair of rollers by a deflection device from the fiber guiding direction into the return direction, so that the sliver is between the upper and lower rollers. and lower apron is performed.

Usually, the straps designed as an endless belt, such as from the EP 2 034 060 A1 known, at least to the drivable lower roller, a deflection device and a Guided tensioning device, which holds the lower apron to the pretension necessary for operation. The lower apron can be driven via the drivable lower roller, the transmission of the drive torque from the roller to the apron usually being ensured via a frictional connection with an upper apron or an upper roller.

The fiber guidance of the sliver or the draft quality is essential for the yarn quality, with a uniformly spun yarn being achieved by an even draft of the sliver. After the lower apron has to be pressed against a possible upper apron or an upper roller in order to stretch a sliver in the area of the main drafting zone, the surfaces in contact with the slivers wear as a result of friction. As wear progresses, the quality of the spun yarn is increasingly negatively influenced, with considerable disadvantages occurring in particular in high-draft drafting systems, so that the aprons have to be replaced frequently.

In known drafting devices, the replacement of the apron, due to the necessity of removing and reinstalling a large number of components, is associated with a considerable expenditure of time, within which a spinning station equipped with the apron drafting device in question cannot be used.

Proceeding from this, the invention is based on the object of providing a support device for an apron drafting device and an apron drafting device of a spinning machine, which allow a quick change of an apron.

The invention achieves the object by a support device with the features of claim 1 and by a strap stretching device with the features of claim 9. Advantageous developments of the invention are specified in the dependent claims.

It is characteristic of the support device according to the invention that the first support has a base element and a guide section which can be detachably connected to the base element. The guide section has a bearing opening for the rotatable mounting of the drafting roller and a first receiving opening for receiving a first bearing section of the apron bridge.

The support device according to the invention has two supports which can be arranged at a distance from one another which can preferably be arranged on a base support of the support device. While the second support is designed to detachably accommodate the apron bridge and / or for the rotatable mounting of the drafting roller, it is provided that the first support is designed in at least two parts and has a base element, which can in particular be connected to the base support, and one detachable to the base element having connectable guide portion. This has a bearing opening for the rotatable mounting of the drafting roller and a receiving opening for receiving a first bearing section of the apron bridge. The division of the support in two, with the base element preferably being connectable to the base support in a stationary manner, enables the guide section to be easily dismantled and assembled if necessary due to the detachable arrangement of the guide section on the base element. For the rotatable mounting of the drafting roller, this has a bearing opening within which, for example, a bearing of the drafting roller can be detachably received. In addition, the guide section also has a first receiving opening which is suitable for the arrangement of a first bearing section of the apron bridge, via which the apron bridge is supported on the first support.

The separability of the guide section from the base element makes it possible, if necessary, to easily change an apron running around the drafting roller and the apron bridge. After the guide section has been removed from the base element, the drafting roller and the apron bridge are freely accessible on one side, so that the apron to be exchanged can be easily removed via the free ends of the apron bridge and the drafting roller via the given accessibility. A new apron can then be easily arranged and tensioned on the apron bridge and the drafting roller. After a new apron has been arranged, the guide section is mounted on the base element, with the first bearing section of the apron bridge again being arranged in the first receiving opening and the drafting roller again rotatably arranged in the bearing opening in the operating position then present.

The support device according to the present invention enables a particularly simple and quick exchange of the apron on the drafting device carriage, since the apron can be easily accessed by simply removing the guide section. As a result, compared to the apron drafting units known from the prior art, there is the possibility of a faster restart of a spinning station of a textile machine assigned to the respective drafting unit.

The design of the connection between the guide section and the base element is basically freely selectable, this being designed in such a way that, on the one hand, the apron bridge and the drafting roller are reliably secured in position in the operating position, but at the same time there is also a simple and quick removal option. According to an advantageous embodiment of the invention, however, it is provided that the guide section in the operating position is detachably connected to the base element via a linear guide, in particular a dovetail guide, aligned in the longitudinal axis direction of the drafting roller and the apron bridge.

The use of a linear guide for arranging the guide section on the base element ensures a particularly reliable arrangement of the drafting roller and the apron bridge on the first support in the operating position. The form-fit that exists via the linear guide, in particular the dovetail guide transversely to the longitudinal axis of the drafting roller and the apron bridge in the operating position, reliably prevents the guide section from being displaced relative to the base element and thus ensures reliable rotatable mounting of the drafting roller and a fixed arrangement of the apron bridge. In addition, the linear guide offers a guided adjustment of the guide section relative to the base element in the longitudinal axis direction of the apron bridge and the drafting roller, so that tilting, both during dismantling and assembly of the guide section on the base section, is reliably prevented.

A fixed arrangement of the drafting roller and the apron bridge in the operating position is advantageous for the function of the support device, which can preferably be designed as a drafting device carriage, for which a stationary arrangement of the guide section on the base element in the operating position is conceivable. This can basically be produced in any way. According to a particularly advantageous embodiment of the invention, however, a securing element, in particular a securing screw, is provided for locking the guide section on the base element in the operating position. Any desired securing elements can be used to secure the position of the guide section on the base element, for example also spring-loaded latching elements or clamping brackets which fix the guide section in the operating position on the base element. The use of a securing screw, which extends, for example, through a section of the guide section into the base element and can be screwed into the base element, enables positional securing in a particularly reliable manner of the guide section on the base element. The use of a locking screw is characterized by its small footprint and low cost.

The arrangement of the second bearing section of the apron bridge opposite the first bearing section of the apron bridge on the second support that can preferably be connected to the base support or can be arranged on the base support is basically freely selectable. For example, in a simple embodiment, the apron bridge can be screwed to the support in order to ensure a fixed arrangement of the apron bridge on the second support in a reliable manner.

According to a particularly advantageous embodiment of the invention, it is provided that the second support for detachably receiving the second bearing section of the apron bridge has a second receiving opening with an inlet bevel running at an angle to a receiving axis, the receiving axis in the operating position of the apron bridge through a first and second receiving opening connecting Axis is formed, and has a spaced from the inlet slope, the second receiving opening delimiting first latching means, which in the operating position can be brought into engagement with a complementary second latching means on the second bearing section, the second bearing section of the apron bridge in the second receiving opening between the operating position and a release position in which the first latching means and the second latching means are disengaged, is adjustable.

According to this preferred embodiment of the invention, the apron bridge is initially arranged on the support device via an arrangement of the second bearing section on the second support. The apron bridge, which is oriented obliquely to the receiving axis, which in the operating position of the support device extends parallel to a longitudinal axis of the apron bridge and / or the drafting roller, is pushed into the second receiving opening of the second support with the second bearing section along the inclined inlet slope to the receiving axis. In the inserted position, due to the pivoting possibility given by the configuration of the second receiving opening with an inlet slope, the apron bridge is swiveled into a position in which the apron bridge is aligned parallel to the drafting roller.

In this position, the apron bridge rests with a section of the second bearing section preferably on a shoulder of the second support. Furthermore, this is preferably located as in First latching means formed in the direction of the inlet slope of protruding latching bodies in engagement with the second latching means, preferably formed as a latching recess, on the second bearing section, whereby there is then a shift lock relative to the second support in the longitudinal axis direction of the apron bridge or in the direction of the receiving axis. Compared to the apron bridge aligned in this way, the guide section in the receiving axis direction or in the longitudinal axis direction of the apron bridge and the drafting roller, for example configured with an advantageously provided linear guide, can then be pushed onto the first bearing section and the free end of the drafting roller.

The design allows a simple and reliable arrangement and, if necessary, an exchange of the apron bridge on the second support. The form fit, which is preferably formed via the latching body and the latching recess, also prevents the apron bridge from moving out of its position corresponding to the operating position when the guide section is removed from the base element. This embodiment of the invention thus facilitates a change of aprons in a supplementary manner.

In principle, the design of the first and second locking means can be freely selected. According to an advantageous embodiment of the invention it is provided that the second locking means is designed as an elongated hole and / or the first locking means is designed as a locking pin aligned perpendicular to the longitudinal axis of the drafting roller. The use of a locking means designed as an elongated hole enables the apron bridge to be adjusted on the second support, so that an optimal alignment of the apron bridge is possible. The locking pin is characterized by its particularly simple design and high functional reliability. In an alternatively preferred manner, the locking pin can be provided with the apron bridge and the elongated hole with the second support.

The arrangement of the drafting roller with its end opposite the first support can in principle take place in any desired manner, for example also on the second support. According to a particularly advantageous embodiment of the invention, it is provided that the support device is designed to support a drive unit, the drafting roller being able to be mounted in a stationary manner on the drive unit with its end opposite the first support. The possibility of mounting the drafting roller directly on the drive unit that can be arranged on the supporting device, in particular on the base support, ensures reliable positional securing of the drafting roller on the supporting device even in the dismantled position of the guide section. Besides the direct mounting of the drafting roller on the drive unit means that a separate mounting on a support opposite the first support can be dispensed with. In a particularly advantageous manner, the second support can be designed in one piece with the housing of the drive unit, which results in a particularly compact design.

According to a further preferred embodiment, the support device according to one of the preferred embodiments described above can form an at least partially assembled unit. For example, the first and / or second support on the base support can be arranged at a distance from one another and / or connected to the base support at a distance from one another. In particular, the base element of the first support can be connected to the base support. The guide section can also be detachably connected to the base element. The same can apply in a corresponding manner to the linear guide designed, for example, as a dovetail guide, the draft roller which can be mounted on the drive unit, the apron bridge which can be longitudinally displaceably mounted along the receiving axis and the first and second latching means which can be brought into engagement.

According to a further aspect of the present invention, an apron drafting device is proposed. The apron drafting device according to the invention for a spinning machine, in particular air-jet spinning machine, with a support device with a lower apron guided over a drivable lower roller, which is supported in the area of a main draft zone by a sliding section of a apron bridge, is characterized in that the support device is designed according to one or more of the above embodiments is, in particular in that the first support has a base element connected to the base support and a guide section detachably connected to the base element with a bearing opening for rotatable mounting of the drafting roller and a first receiving opening for receiving a first bearing section of the apron bridge.

A correspondingly designed apron stretching unit is characterized in that it enables a worn apron to be changed particularly easily and quickly, with only the guide section having to be removed from the base element after the creation of accessibility to the support device, which makes it possible to remove the one to be replaced Slips over the then free ends of the drafting roller and the apron bridge in the course of pivoting the free end of the apron bridge in the direction of the drafting roller to release the apron tension. Then can then the new apron can be arranged on the drafting roller and the apron bridge and tensioned again in a simple manner. The alignment and strap tension required for operation are then established by attaching the guide section to the base element.

Fig. 1

eine perspektivische Ansicht eines Streckwerkschlittens mit einer Verzugswalze und einer Riemchenbrücke in der Betriebsposition;

Fig. 2

eine perspektivische Ansicht des Streckwerkschlittens von Figur 1 im demontierten Zustand der ersten Stütze und einer Einschubposition der Riemchenbrücke;

Fig. 3

eine perspektivische Ansicht des Streckwerkschlittens von Figur 1 in einem teilverschwenkten Zustand der Riemchenbrücke;

Fig. 4

eine perspektivische Ansicht des Streckwerkschlittens von Figur 1 in einer Betriebsposition der Riemchenbrücke und der Verzugswalze;

Fig. 5

eine perspektivische Ansicht eines Riemchenstreckwerks mit einem Streckwerkschlitten gemäß Figur 1 und

Fig. 6

eine perspektivische Ansicht des Streckwerkunterteils des Riemchenstreckwerks von Figur 5.

An embodiment of the invention is explained below with reference to the drawings. In the drawings show:

Fig. 1

a perspective view of a drafting device carriage with a drafting roller and an apron bridge in the operating position;

Fig. 2

a perspective view of the drafting carriage of Figure 1 in the dismantled state of the first support and an insertion position of the apron bridge;

Fig. 3

a perspective view of the drafting carriage of Figure 1 in a partially pivoted state of the apron bridge;

Fig. 4

a perspective view of the drafting carriage of Figure 1 in an operating position of the apron bridge and the drafting roller;

Fig. 5

a perspective view of an apron drafting device with a drafting device slide according to FIG Figure 1 and

Fig. 6

a perspective view of the drafting device lower part of the apron drafting device from Figure 5 .

In Figure 5 a perspective view of an apron drafting device 1 of a spinning station (not shown here) of a textile machine is shown, which can be fixed on the textile machine via locking hooks 21. The apron drafting system 1 has an upper part 19 of the drafting system, which is connected in an articulated manner to a lower part 2 of the drafting system, pivoting being effected by actuating a handle 20.

In the in Figure 5 The operating position of the apron stretching unit 1 shown in the figure, the upper part 19 of the drafting unit with four upper rollers arranged one behind the other in the direction of a sliver (not shown here) through the apron stretching unit 1 abuts the corresponding driven lower rollers 3, 4, 5, 6 of the lower part 2 of the drafting unit. The lower rollers 3, 4, 5, 6 include the infeed roller 3 which first comes into contact with the sliver and which is driven by a roller drive 7 and forms the first lower roller of the lower part 2 of the drafting system. The Infeed roller 3 is arranged together with the roller drive 7 on a support device 8a designed as a drafting device carriage, which - like the support devices 8b, 8c, 8d explained below, which are each designed as a drafting device carriage, - is designed for connection to a frame 16 of the drafting device lower part 2 is (cf. Fig. 2 ).

The drafting device carriage 8a is arranged downstream of the drafting device carriage 8a in the running direction of the sliver, on which a first drafting roller 4 with a roller drive 7 driving the drafting roller 4 is arranged. The drafting device slide 8b is in turn - viewed in the running direction of the sliver - arranged downstream of the drafting device slide 8c, which has a second drafting roller 5 and a roller drive 7 which drives the drafting roller 5. In contrast to the drafting device carriage 8b, the drafting device carriage 8c also has a strap bridge 9, which is held with its opposing bearing sections 27, 28 on a first and a second support 11a, 11b, which are connected to a base support 17 of the drafting device carriage 8c.

A lower apron 10 runs on the drafting device carriage 8c around the apron bridge 9 and the second drafting roller 5 and ensures that a sliver does not come into direct contact with the second drafting roller 5. The drafting device carriage 8c is ultimately followed in the direction of transport of the sliver by the drafting device carriage 8d, which has an outlet roller 6 driven by a roller drive 7, via which the drawn fiber sliver leaves the apron drafting device 1.

To replace the lower apron 10, the first support 11a of the drafting device carriage 8c has a base element 12 connected to the base support 17 and a guide section 13 that can be detachably arranged on the base element 12. In the in Figure 1 The operating position of the drafting device carriage 8c shown in the illustration shows the guide section 13 in its mounted position, the guide section 13 being arranged on a guide element 25 of the base element 12 via an opening not shown here.

To secure the in Figure 1 The illustrated mounted position of the guide element 13 on the base element 12 is a screw 23 which can be screwed through an opening 24 in the guide section 13 into the guide element 25 on the base element 12.

In the operating position secured as a result, the first bearing section 27 of the apron bridge 9 is located in a continuous first receiving opening 15 on the guide section 13. In addition, a drawing roller bearing 22 arranged on the end of the drawing roller 5 opposite the roller drive 7 is located in the bearing opening 14 provided for this purpose the guide section 13.

An exchange of the lower apron 10, which is held in its position on the apron bridge 9 and the drafting roller 5 via a apron guide 18 arranged on the base support 17, is carried out by loosening the screw 23 and pulling the guide section 13 off the base element 12 up to the in Figure 3 position shown. In this position there is the possibility of pulling the lower apron 10 unhindered over the then free ends of the drafting roller 5 and the apron bridge 9 and then arranging a new lower apron 10 on the drafting device slide 8c.

There is also the possibility of replacing the apron bridge 9. For this purpose, the apron bridge 9 is displaced by pivoting it into the FIG Figure 2 position shown. The pivotability of the apron bridge 9 on the second support part 11b results from the configuration of the second receiving opening 29 for the second bearing section 28 of the apron bridge 9. Thus, the second receiving opening 29 has an inlet bevel, which in the FIG Figure 2 The illustrated removal position of the apron bridge 9 enables the apron bridge to be pulled out of the second receiving opening 29.

A new apron bridge 9 can then be arranged again on the drafting device carriage 8c in the reverse order, the apron bridge 9 with the second bearing section 28 in the in FIG Figure 2 aligned position along the inlet slope is inserted into the second receiving opening 29.

A subsequent pivoting over the in Figure 3 Intermediate position shown for receiving a lower apron in the in Figure 4 In addition to the tensioning of the lower apron, the end position shown also results in a locking pin 30, designed as a first locking means, on the second support 11b, which protrudes in the direction of the inlet slope of the receiving opening 29, in which in FIG Figure 2 position shown with an elongated hole 32 designed as a second latching means on the second bearing section 28 of the apron bridge 9 engages and thereby the apron bridge 9 in the longitudinal axis direction of the drafting roller 6 in its position specifies.

After adjusting the apron bridge 9 in the in Figure 4 position shown, in which this rests on a shoulder 31 of the second support 11b, and after sliding the guide section 13 onto the base element 12, the drafting device carriage 8c can be put back into operation.

List of reference symbols

1

Apron stretching system

2

Drafting system lower part

3

Infeed roller

4th

first drafting roller

5

second drafting roller

6th

Discharge roller

7th

Roller drive

8a

Drafting carriage (infeed roller)

8b

Drafting unit slide (first drafting roller)

8c

Drafting device slide (second drafting roller)

8d

Drafting unit slide (discharge roller)

9

Strappy bridge

10

Lower strap

11a

first prop

11b

second support

12

Base element

13th

Guide section

14th

Warehouse opening

15th

first receiving opening

16

Frame (lower part of the drafting system)

17th

Basic carrier

18th

Apron guide

19th

Upper part of the drafting system

20th

Handle

21st

Locking hook

22nd

Drafting roller bearings

23

screw

24

opening

25th

Guide element

26th

opening

27

first storage section (apron bridge)

28

second storage section (apron bridge)

29

second receiving opening

30th

Locking pin (first locking means)

31

paragraph

32

Oblong hole (second locking means)

Claims (9)

Carrying device (8c) for an apron drafting unit (1) of a spinning machine, with - A first (11a) and a second support (11b), each of which is designed to detachably accommodate a strap bridge (9) and / or to rotatably support a drafting roller (4, 5), characterized in that
the first support (11a) has a base element (12) and a guide section (13) which can be detachably connected to the base element (12) and has a bearing opening (14) for rotatably supporting the drafting roller (5) and a first receiving opening (15) for receiving a first one Has bearing section (27) of the apron bridge (9). Support device (8c) according to claim 1, characterized in that the support device (8c) has a base support (17) on which the first (11a) and second supports (11b) can be arranged at a distance from one another, the base element (12) with the base support (17) can be connected. Carrying device (8c) according to claim 1 or 2, characterized in that the guide section (13) in an operating position can be detachably connected to the base element (12) via a linear guide, in particular a dovetail guide, aligned in the longitudinal axis direction of the drafting roller (5) and the apron bridge (9) is. Supporting device (8c) according to one or more of the preceding claims, characterized by a securing element, in particular a securing screw (23) for locking the guide section (13) on the base element (12) in the operating position. Carrying device (8c) according to one or more of the preceding claims, characterized in that the second support (11b) has a second receiving opening (29) with an inlet slope running obliquely to a receiving axis for releasably receiving a second bearing section (28) of the apron bridge (9) , wherein the receiving axis in the operating position of the apron bridge (9) is formed by an axis connecting the first (15) and second receiving opening (29) and has a first latching means (30) spaced from the inlet slope and delimiting the second receiving opening (29) , which in the operating position with a complementary second locking means (32) on the second bearing section (28) can be brought into engagement, the second bearing section (28) of the apron bridge (9) in the second receiving opening (29) between the operating position and a release position in which the first latching means (30) and the second latching means (32 ) are out of engagement, is adjustable. Carrying device (8c) according to one or more of the preceding claims, characterized in that the second latching means is designed as an elongated hole (32) and / or the first latching means is designed as a latching pin (30) aligned perpendicular to the receiving axis. Carrying device (8c) according to one or more of the preceding claims, characterized in that the carrying device (8c) is designed to carry a drive unit (7), the drafting roller (5) being stationary at its end opposite the first support (11a) Drive unit (7) can be stored. Carrying device (8c) according to one or more of the preceding claims, characterized in that the apron bridge (9) in the operating position can be mounted on the first and second supports (11a, 11b) so as to be longitudinally displaceable along the receiving axis. Apron drafting device (1) for a spinning machine, in particular air-jet spinning machine, with a support device (8c) with a lower apron (10) which is guided over a drivable lower roller and which is supported in the area of a main draft zone by a sliding section of an apron bridge (9),
characterized in that
the support device (8c) is designed according to one or more of the preceding claims.

Images