JPH08209469A - Double apron drafting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject structure capable of checking wrong draft caused by the delivery of a fiber bundle in a floated state by constituting the structure so that both aprons may not receive load and may be wound around both bottom and top rollers of another roller pair moved according to the apron. SOLUTION: This double apron draft structure in a fine spinning frame has a bottom apron 13 wound around driven load-receiving bottom rollers 3, 5 of two roller pairs 3/4, 5/6, and a top apron 15 wound around top rollers 4, 6. The aprons 13, 15 wind around turning rails 14, 16 at the outlet of a fiber bundle guided by the aprons 13, 15. A roller pair 17/18 composed of a carrying roller 17 supported in a position-changeable slider 10 moved according to the movement of each apron 13, 15 between the driven roller pair 3/4, 5/6, and the driven roller pair 5/6 and the turning rails 14, 16, and a weight roller 18 held in a machine casing 19 capable of being engaged to the shaft 20 of the top rollers 4, 6 is installed to prevent the floatation of the fiber bundle in a draft zone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a bottom apron winding a bottom roller of a pair of driven and weighted rollers and a top apron winding a top roller of both rollers. A double apron, in which each of the two aprons is wound around a turning rail at the exit of the sliver guided by them.
Regarding the draft mechanism.

[0002]

2. Description of the Related Art A double apron-draft mechanism of this kind is known from the German Utility Model No. 1,800,14.
It is known from FIG. However, in this draft mechanism, the fibers are guided only by the roller pair and the apron. This guidance is in all cases, eg the so-called "floating" of the fiber bundles in the draft zone.
Insufficient to prevent fraudulent drafting by sending.

Further, a top roller provided inside the top apron is supported in a U-shaped machine frame, and the machine frame is provided on a protrusion provided for this machine frame of the machine base. A double apron-draft mechanism of the guided manner is also known (German Patent No. 14).
10 609). In addition, German Patent No. 1135806 discloses a machine frame having a U-shaped cross section for holding a top roller that is not subjected to weighting. It is suspended along the guide slit of the rod (Chapeaustange).

In both cases, the machine frame is not pivotally attached to the carrying and weighting arm, so that the machine frame remains in the draft zone as the arm pivots upwards and is additional for operating the draft mechanism. It requires manual operation. Furthermore, a double apron-draft mechanism is known in which the apron is wound around only one roller pair which is driven and weighted, and a so-called hollow roller pair is provided inside the apron. 28th
33 376). These rollers are provided with cutouts in their peripheral surface, so that in these areas they exert only a very reduced pressure load on the apron and thus also on the sliver. . At the outlet end, both aprons are turned by turning rollers. The optionally non-reducible diameter of these deflecting rollers impedes the close contact of the outlet opening of the apron pair with the supply roller pair and has a detrimental effect on the drafting operation of the drafting mechanism.

[0005]

The problem underlying the present invention is to provide a double apron-draft mechanism in which the disadvantages mentioned above are avoided.

[0006]

According to the invention, a double apron-draft mechanism is provided according to the invention in which the two aprons are unweighted and the bottom roller and the top roller of the other two roller pairs carried by the apron. It is solved by being configured to wind.

In this way, the suppressed action of the apron pair on the fibers in the draft zone between the roller pair and the feed roller pair, which is driven first and which clamps the sliver by its weight in the running direction of the fiber, is strengthened at two positions. To be done. Further, according to the present invention, a turning rail is provided instead of the turning roller, and the turning rail allows close contact of the supply roller pair with the entrance slit.

Depending on the requirements, in particular depending on the stapling properties of the fibrous material processed by the drafting mechanism, a pair of unloaded rollers may be provided between the driven roller pairs or between the turning rail and the turning rail. It can be provided between a pair of driven and driven rollers. It is often advantageous to provide two unloaded roller pairs between the driven roller pair and the turning rail.

In order to support the roller pairs which are not subjected to the load carried by the apron, the invention provides a stationary bearing stand for the bottom rollers of these roller pairs, which bearing stand is a draft. It is fixed to the machine frame of the mechanism, for example, to the punching section. According to the invention, the top rollers of this roller pair are held in the machine frame, which machine frame is in particular fixed to the top rollers of the roller pair to which it is subjected to a load, in particular to its shaft. This allows the top apron to hold the top apron and additional top roller, with the advantage that the top apron, which generally carries the top roller and is lifted together when the load-sensing arm jumps upwards. The advantage is that it does not require additional measures and equipment for

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0011]

The drafting mechanism according to the invention, in which the sliver passes from right to left, comprises four driven roller bottom rollers 1, 3, 5 and 7, which are here Top rollers 2, 4 respectively held by carrying and weighting arms (not shown)
6 and 8 belong. The load of the top roller, which is formed as a twin roller, is indicated by an arrow.

The bottom roller 7 is supported in a punching member 9, and one of the bottom rollers 1, 3, and 5 is supported in a slider 10 movable on the punching member 9. In the slider 10 of the bottom roller 3, a trumpet 12 is fixed along a rail 11 slidable in parallel with these bottom rollers. Such a trumpet is not shown in the drawing, but the bottom roller 1
It is also possible to provide a rail that can slide in the guide portion in the slider 10.

The bottom rollers 3 and 5 having the same diameter and rotated at the same number of revolutions are wound by a common bottom apron 13, which is further turned just before the front roller pair 7/8. The rail 14 is wound. This turning rail 14 is likewise fixed in the punching member 9 as shown. The top rollers 4 and 6 are also wound by a common top apron 15, which winds a turning rail 16 just before the front roller pair 7/8. This turning rail 16
Is held by a carrying and weighting arm, which is not shown in detail, but is also not shown.

In the embodiment according to FIG. 1, in the bottom apron 13 and the top apron 15 between the roller pair 3/4 and 5/6 and between the roller pair 5/6 and the turning rails 14, 16. Another pair of rollers having a relatively small diameter, each of which is composed of a lower carrying roller 17 and an upper weighting roller 18, is provided. The lower carrier roller 17 has no drive mechanism, so that the roller pair 17/18 is carried by the apron 13,15.

The carrying roller 17, like the bottom rollers 3 and 5, is supported in the slider 10. Bottom roller 3
The carrier roller 17 between 5 and 5 has its own slider and the other carrier roller 17 is supported in this slider 10 of the lower bottom roller 5. Of course, each of the carrying rollers 17 may have its own slider,
Alternatively, both bearing rollers can be mounted in the slider 10 of the bottom roller 3.

The weight roller 18 is supported in a machine frame 19, which is provided between the top rollers 4 and 6 of each top roller pair. The machine frame 19 is pivotally attached to a shaft 20 of the pair of top rollers 4 and 6. For this purpose, this machine frame 19 is engageable on the horizontal slot link 21 which is pushed into the shaft 20 of the top roller 4 in the embodiment according to FIG. 1 and on the shaft 20 of the top roller 6. The holding member 22 is provided. Therefore, one side surface of the holding member 22 is formed as an elastic tongue piece 23. This tongue is elastically recoverable when a retaining member whose opening has an inner diameter smaller than the diameter of the shaft 20 is engaged with the shaft. Therefore, the machine frame is advantageously made of elastic plastic. However, the machine frame may also be made of metal, in which case the holding member 22
It may be provided with elastic tongues, for example in the form of leaf springs.

The machine frame 19 has two side plates 24,
These side plates are connected to each other via two spacer pieces 25. The shaft 27 of the weight roller pair 18 is freely rotatably guided in the vertical long hole 26 of the side plate 24, and therefore, the weight roller pair 18 is loaded by its own weight and the belt below the top apron 15 is loaded. Get on the part. Further, the shaft 28 of the roller pair 29 is rotatably supported in the machine frame 19, and is mounted on the belt portion above the top apron 15 on the frame of the roller pair, and the collar on the side of the roller pair is mounted. Guided sideways by 30.

When flipped up above the carrying and weighting arm, not only the top rollers 2, 4, 6 and 8 but also the machine frame 19 and, together with it, the weighting roller 18 are lifted, so that the draft zone is complete. Open to. In the embodiment according to FIG. 2, both roller pairs 17/18
Is provided between the roller pair 3/4 and 5/6. In this embodiment, the turning rail 16 of the top apron 15 is not provided on the carrying and weighting arm, but is mounted on the top apron cage 31 of the normal structure which is engaged with the shaft 20 of the top roller 6. It is provided. For this reason, the arrangement of the slot link 21 and the holding member 22 is also shown in FIG.
This is the reverse of the embodiment according to. Slot link 2
1 is suspended in the shaft 20 of the top roller 6 at this time, while the holding member 22 is engaged in the shaft 20 of the top roller 4. In this case as well, the free side surface of the holding member 22 is provided on the elastic tongue piece 23.

In this case, the lateral guidance of the top apron 15 is provided by the tongue 32 on the lateral side of the top apron cage 31, so that the roller pair 29 can be dispensed with. In order to allow the long fibers to pass under the aprons 13,15, at least the top roller 6 is provided with a notch 33 shown in phantom in the central region with respect to its axis of rotation. The top roller 4 may also be provided with such notches when processing particularly long fibers.

Top apron 15 and bottom apron 13
In order to prevent lateral displacements of the apron and to allow for the most equal possible running of the apron, as can be seen from FIG. 5, for example one of the sliders 10 of the bottom roller 5 is provided with a rail 34. Is fixed, and this rail carries a U-shaped stirrup member 35. The leg portions 36 and 37 of the stirrup member 35 are aprons 13,
It has a spacing somewhat larger than the width corresponding to 15 and projects from both aprons. Of course, such a device can also be used in the embodiment according to FIG.

[0021]

According to the present invention, the conventional double apron-
A double apron-draft mechanism is obtained which does not have the drawbacks of the draft mechanism.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of a draft mechanism according to the present invention.

FIG. 2 is a sectional view of a second embodiment of the draft mechanism according to the present invention.

FIG. 3 is a side view of the apron of FIG.

FIG. 4 is a plan view of the machine casing of FIG.

FIG. 5 is a view of the apron-guide as seen in the direction of fiber travel.

[Explanation of symbols]

 1,3,5,7 Bottom roller 2,4,6,8 Top roller 9 Punching member 10 Slider 11 Rail 12 Trumpet 13 Bottom apron 14 Bottom apron turning rail 15 Top apron 16 Top apron turning rail 17 Carrying roller 18 Weighted Roller 19 Machine frame 20 Top roller shaft 21 Slot link 22 Holding member 23 Retaining member elastic side wall 24 Side plate 25 Spacer piece 26 Long hole 27 Pressing roller shaft 28 Roller pair shaft 29 Roller pair 30 Roller pair collar 31 Top Apron cage 32 Top apron cage tongue 33 Top roller notch 34 Rail 35 Stirrup 36, 37 Leg

Claims (12)

[Claims] 01. A bottom apron, which winds the bottom roller of two roller pairs that are driven and receives a load, and a top apron, which winds the top rollers of both roller pairs, are provided. In a double apron-draft mechanism for a spinning machine, each of which winds a turning rail at the exit of the sliver guided by them, both aprons (13, 15) are unloaded and are carried by the apron. A double apron-draft mechanism, which is configured to wind another carrying roller (17) and a weighting roller (18) of the other two roller pairs. 02. Another roller pair (17/18) carried by an apron (13, 15) is provided between the driven roller pair (3/4 and 5/6). A double apron-draft mechanism according to claim 1. 03. Between one roller pair (2/4 and 5/6) driven by one pair of the other roller pair (17/18) carried by an apron (13, 15) and by The double apron-draft mechanism according to claim 1, characterized in that another pair of rollers to be driven is provided between the pair of driven rollers and the turning rails (14, 16). 04. A roller pair driven by an apron (13, 15), in which a weighted roller (18) of a roller pair (17/18) is held in a machine casing (19) and the machine casing is driven. (3/4 and 5/6) top rollers (4, 6)
Double apron-draft mechanism according to claim 1, characterized in that it is engageable in the shaft (20) of the. 05. The double apron according to claim 4, characterized in that the machine frame (19) consists of two side plates (24) connected to one another via spacer pieces (25).
Draft mechanism. 06. The side plate (24) is a slot link (2).
5. Double apron-draft mechanism according to claim 4, characterized in that it comprises a retaining member (22) and a retaining member (22), which are engageable with the shaft (20) of the top roller (4, 6). . 7. Double apron-draft mechanism according to claim 6, characterized in that at least one of the side walls (23) of the holding member (22) is elastically formed. 08. A carrier roller (17) of a roller pair (17/18) carried by an apron (13, 15) is supported in a positionally movable slider (10). The double apron-draft mechanism of claim 1. 9. Double apron-draft mechanism according to claim 1, characterized in that the turning rails (14) of the bottom apron (13) are fixed to a stationary member (9). 10. A carrying and weighting arm for a top roller according to claim 1, characterized in that the turning rail (16) of the top apron (15) is fixed to the carrying and weighting arm. Double apron-draft mechanism. 11. A device (35) for performing common lateral guidance of the apron is provided in a region where a top apron (15) and a bottom apron (13) are provided above and below each other. A double apron-draft mechanism with top and bottom aprons of equal width according to claim 1. 12. The device comprises an immovable U-shaped stirrup (35), the stirrup apron (1) of which is provided.
Double apron-draft mechanism according to claim 11, characterized in that the legs (36, 37) lying beside the (3, 15) have a spacing slightly larger than the width of the apron.