EP0322694B1 - Feed roll drive device for a combing machine - Google Patents

Description

The present invention relates to a drive device for the feed cylinder of a combing machine according to the preamble of claim 1 and to a method for carrying out a mixed feed.

It is known in the field of spinning, the movement of the top tongs of combing machines in both the feed, i.e. when the feed cylinder is driven when the tongs move forward, as well as when the feed is returned, i.e. when driving the feed cylinder when the forceps move backwards, to use to drive the feed cylinder.

Such a device is already known from DE-AS 1139414, wherein a switching wheel is rotated via a pawl by the reciprocating movement of the pliers. The ratchet wheel is rotatably connected to a feed roller, which also rotates the same. The back and forth movement of the pliers takes place via a swivel arm articulated in the rear area of the lower pliers, which is firmly connected to a drive shaft at its end opposite the articulation point. The drive of this drive shaft is designed so that it generates reverse directions of rotation at predetermined time intervals and thus causes the pliers to move back and forth. In the front area of the pliers, another articulated arm is rotatably articulated, the other free end of which is rotatably mounted on the axis of rotation of the circular comb. It is a four-bar drive. The upper tongs are rotatably mounted on the lower tongs about an axis of rotation and can be rotated in their rear region with a spring-loaded swivel arm connected, which is rotatably mounted on the drive axis. The corresponding arrangement of the articulation points of the upper and lower pliers results in a displacement of the rear articulation point of the upper pliers with respect to the axis of rotation of the upper pliers on the lower pliers. That means, in the present example, the tongs close during their backward movement and, via the switching pawl indirectly connected to the top tongs, generate a rotary movement of the switching wheel and thus also a rotary movement of the feed roller, whereby the cotton wool is shifted forward by a certain amount of food.

Depending on the arrangement of this pawl, on the one hand, the supply can take place in the feed or in the return of the pliers.

A similar device is shown in US Pat. No. 3,604,063, the lower pliers being pivotally mounted on a drive shaft which is located above the pliers assembly. The upper tongs are rotatably mounted on the lower tongs about an axis of rotation and are acted upon by a spring element to this axis of rotation, which is rotatably fastened on the one hand to the upper tongs and on the other hand to the frame of the combing machine. The feed is also carried out via a ratchet drive, the pawl is rotatably mounted on the top pliers and is held in contact with a gear wheel provided with teeth via a spring. Corresponding to the articulation of the upper and lower pliers, there is also a different displacement of the articulation points and thus an opening and closing of the pliers during the back and forth movement.

Replacing the ratchet wheels, or another attachment of the pawls for changing from the feed to the return feed and vice versa, is disadvantageous because this exchange is relatively complicated and expensive. This is the case if it is always associated with the disassembly and assembly of the entire machine unit.

A feed roller drive is known from the GDR patent specification 218782 A3, in which the change from forward to return drive is easier. The movement of the feed roller takes place using gearwheels actuated by ratchets and the change between forward and reverse drive by moving the pawls into their working or rest position. However, this arrangement has the disadvantages of an increase in the noise level due to the interaction of the pawls and the ratchet wheels.

These disadvantages are to be avoided according to the invention. The latter has the features listed in the characterizing part of claim 1. It thus has the advantage that the feeds of the feed cylinder are practically always of the same size and thus there is an improvement in the sliver produced. The feeds, which are always of the same size, are based on the fact that, in the case of a freewheel based on clamping bodies, the free travel which occurs when changing from the idling position to the clamping position, ie the play which occurs, can be kept very small. This means that the feeds of the feed cylinder are always of practically the same size. In the case of a ratchet wheel, on the other hand, the standstill position of the pawl pulled off the teeth and thus also the size of the feeds vary over a distance that is the same as that of the neighboring teeth. In addition, this tooth spacing, which is the smallest food amount forms, not be made arbitrarily small, but this is practically the case with the present invention.

This device favors the implementation of a method, wherein the portion of the food amount can be made proportionately with the forward and return movement of the tongs unit.

Fig. 1

eine Seitenansicht einer erfindungsgemässen Antriebsvorrichtung in schematischer Darstellung,

Fig. 2

ein in der erfindungsgemässen Vorrichtung verwendeter Freilauf,

Fig. 3

eine Ansicht der Vorrichtung der Fig. 1 der anderen Seite gesehen, in schematischer Darstellung,

Fig. 4

eine Seitenansicht eines weiteren Beispiels, ebenfalls in schematischer Darstellung, und

Fig. 5

ein weiteres Beispiel eines für die erfindungsgemässe Vorrichtung vorteilhaften Freilaufs.

Fig. 6

eine weitere Ausführungsform nach der Fig. 3

The invention will now be explained in more detail on the basis of exemplary embodiments and the drawing. In the latter are

Fig. 1

2 shows a side view of a drive device according to the invention in a schematic illustration,

Fig. 2

a freewheel used in the device according to the invention,

Fig. 3

2 is a schematic view of the device of FIG. 1 seen from the other side,

Fig. 4

a side view of another example, also in a schematic representation, and

Fig. 5

another example of a freewheel advantageous for the device according to the invention.

Fig. 6

a further embodiment according to FIG. 3rd

Fig. 1 shows a side wall of a carrier 11. This carries a shaft perpendicular to the image plane, on which an arm 12 which is pivotable about the axis 13 is attached. The upper pliers 14 of a combing pliers are attached to the arm 12. A freewheel 15 comprises an inner part 16, an outer part 17, and clamping bodies 18 arranged between them. A holder 19 is fixedly connected to the outer part 17. The inner part 16 is firmly connected to a feed cylinder 20 of the combing machine. This can be done, for example, in such a way that it is attached coaxially to the feed cylinder 20. The latter is covered by the freewheel 15 in FIG. 1.

The feed cylinder 20 is coupled to the arm 12 by a coupling which, in addition to the freewheel 15 and the holder 19, also comprises a push rod 21. This is attached in a crank-like manner to the holder 19 and the arm 12. In two openings in the carrier 11 there are holding rods 24 arranged perpendicular to the plane of the drawing, which serve to move the carrier 11 back and forth and thus to pivot the upper tongs 14.

The known freewheel 15 is shown only schematically in Fig. 1. However, an example of a practical embodiment of such is shown in FIG. 2. The inner part 16 is of circular cylindrical shape. The same applies to the outer part 17. However, its inner lateral surface has a sawtooth shape in cross section with rising and falling parts 22 and 23, respectively. The clamping bodies 18 are provided between the inner part 16 and the outer part 17. These can be designed, for example, as cylinders or balls. These rolling elements 18 have when in are close to the edges 44, some play. In the position shown, however, they are in a pinched position.

FIG. 3 shows a view of the side wall of the carrier 11, which is opposite the side wall shown in FIG. 1, each of the walls being at one end of the feed cylinder 20. It should be noted that in FIG. 3 the right and left are reversed with respect to FIG. 1. While the front of the drive device according to FIG. 1 is on the right, it is on the left in FIG. 3.

FIG. 3 in turn shows the upper tongs 14, the feed cylinder 20 and the two holding rods 24. The end of the upper tongs 14 visible in FIG. 3 is fastened to a further arm 25 which can also be pivoted about the axis 13.

A second freewheel 27 is located on the side of the drive device shown in FIG. 3. This can also be designed as shown in FIG. 2. Its inner part 28 is in turn fixed to the feed cylinder 20 covered by the freewheel 27 in FIG. 3, and its outer part 29 is fixedly connected to a holder 30. A push rod 31 is in turn connected to the parts 25 and 30 in a crank-like manner.

To explain the mode of operation it is assumed that the drive device for the feed cylinder, ie the carrier 11 with the parts carried by it, shown in FIGS. 1 and 3, is in its rear position. The pliers are always closed in this. If the drive device is in is in its forward position, the pliers are always open. This latter state is drawn in dashed lines in Fig. 1 and 3 and designated for the arms with 12 ', 25', the upper clamp with 14 ', the brackets with 19', 30 'and the push rods with 21' and 31 '.

During the forward movement of the drive device or the carrier 11, the pliers are opened by the arm 12 being pivoted upward about the pivot axis 13 into the position 12 '. In this pivoting, with reference to Fig. 1, the push rod 21 is carried and moved into the position 21 shown in broken lines'. As a result, the bracket 19 is rotated in its dashed position 19 '. The outer part 17 of the freewheel 15 which is fixed with the holder 19 is also rotated, i.e. rotates counterclockwise. As can be seen from FIG. 2, there is a jamming of the clamping bodies 18, so that the inner part 16 of the freewheel 15 and thus the feed cylinder 20 fixed with it are also taken along. The latter thus causes the fiber template (not shown) to be fed in the forward direction (i.e. to the right in FIG. 1).

If the carrier 11, ie the drive device, subsequently moves back, the pliers are closed at the same time, the arm 12 being pivoted downward about the axis 13. During this process, the push rod 21 presses the holder 19 down into its starting position. As a result, the outer part 17 is rotated clockwise, as a result of which the clamping bodies 18 are moved towards the falling parts 23 shown in FIG. 2. There they have more space, ie some free play, so that they are not subjected to a clamping effect. So that no torque is exerted on the inner part 16, so that this and thus the feed cylinder 20 remain unaffected by the movement of the arm 12 downward, ie when the pliers are closed.

After the carriers 11 are again in their rear position and the pliers are closed again, the combing process takes place. The described process is then repeated. It can be seen that a feed movement takes place step by step with each forward movement of the carrier 11, so that a forward feed is present:

Referring to FIG. 3, it should be noted that the freewheel 27, which is also equipped with clamping bodies 43, has to be effective or ineffective in the opposite direction of rotation compared to FIG. 2. This is indicated in Fig. 3 by the shape of the inner surface of the outer part 29. In the forward movement of the carrier 11, which is a movement to the left in this Fig., And wherein a pivoting of the arm 25 into its position 25 'and the upper tong 14 their open position 14' takes place, the push rod 31 is in the position shown in dashed lines 31 'moves. The bracket 30 is taken along and rotates the outer part 29 of the freewheel against the direction of the same, i.e. in empty gear. Therefore, the feed cylinder 20 is not moved.

In the subsequent return movement of the carrier 11, the arm 25 is rotated about the pivot axis 13 from its position 25 'back to its starting position and the upper tongs 14 are brought back into their closed position. Move it the push rod 31 and the bracket 30 again from their positions 31 'and 30' back to their starting position. The outer part is rotated in the driving direction of the freewheel 27, ie clockwise according to FIG. 3, and the feed cylinder 20 is rotated clockwise by the inner part 28 which is carried along, so that the fiber template is pushed forward, ie according to FIG. 3 to the left . When the upper pliers 14 are fully returned, the fibers are clamped by the combing pliers and the combing movement then takes place. 3, a feed movement takes place step by step with each backward movement of the drive device, which corresponds to a return feed.

If the push rod 21 is inserted in the drive device according to FIGS. 1 and 3 and the push rod 31 is out of operation, then this operates with feed. Reverse feed is available for reverse use. If both rods 21 and 31 are inserted at the same time, the combing forceps will find between two successive closing movements, i.e. between two successive combing movements two movements of the feed roller 20 and thus two thrusts of the fiber template take place. In this way, the amount of fiber material presented per combing movement can be varied.

With this device, a method can be carried out in which the predetermined and necessary feed amount during a comb play can be divided proportionally between the forward and the return movement of the tongs. The supply is thus quasi continuous and reduced by the lower one Transport speed the load on the drives or the feed roller. The share of the meal can be pre-selected as required.

Another example of the procedure for achieving such a variation in the amount of fiber material supplied per combing process is explained with reference to FIG. 3. In this example, three different fixing points 32, 33, 34 are provided on the arm 25, at which the upper end of the push rod 31 in FIG. 3 can be fastened. These fixing points are at different distances from the pivot axis 13, so that when the arm 25 pivots, they move by differently large distances and thus cause pushes of different sizes.

The angular positioning of the holder 30 and the radial distance from the fastening of the push rod 31 to the holder 30 from the axis of rotation of the freewheel can also be used to vary the strokes.

According to the example shown above, a freewheel 15, 27 is provided at each end of the feed cylinder 20. However, it is also possible to provide only one. Such an embodiment is shown in FIG. 4. According to this, a feed cylinder, not shown, is in turn firmly assembled with the inner part 35 of a freewheel 36. Two brackets 37, 38, which are opposite each other with respect to the axis of rotation 48 of the freewheel 36, are fixedly connected to the outer part 39 of the freewheel 36. The holder 37 is coupled to an arm 42 by means of a push rod 40 and the holder 38 by means of a push rod 41. This in turn carries, together with a second arm, upper tongs 14 and is pivotable about a pivot axis 13. The swiveled positions are again drawn with dashed lines. The forward movement of the drive device or the carrier 11 takes place to the right.

To describe the mode of operation, it is assumed that the freewheel 36 is also of the type shown in FIG. 2 and that one of the rods 40, 41 is mounted alternately and the other is disassembled or otherwise rendered ineffective. It can thus be seen that when the upper tongs 14 are moved upwards, i.e. when the carrier 11 moves to the right, by pulling on the rod 40 the feed cylinder is rotated, and when the upper tong 14 is subsequently lowered, i.e. of the arm 42, the freewheel 36 is not rotated the feed cylinder. Thus, when the rod 40 is installed, there is a feed supply. When the rod 40 is put out of operation and the rod 41 is inserted, the freewheel 36 rotates idle when the upper tong 14 moves upwards and when the upper tong 14 moves downward, the rod 41 rotates the outer ring 17 and thus also the feed cylinder counterclockwise via the holder 38. In this case, there is a preliminary supply.

It can be seen that to change from the feed to the return feed and vice versa according to FIGS. 1, 3, the push rods 21 and 31 and according to FIG. 4, the push rods 40 and 41 must be in operation and out of operation.

It should be noted that it is also possible, for example is to fix the brackets 19 and 30 to the inner parts 16, 28 and the feed cylinder 20 to the outer parts 17, 29 in an arrangement corresponding to FIGS. 1 and 3.

In practice, in the freewheel shown in Fig. 2, the space available for the sprags 18 in idle, i.e. the game for the clamping body 18, dimensioned tighter than that shown in FIG. 2. The space conditions are such that there is only a small amount of play around the clamping bodies 18 only in the position in which they are located in the immediate vicinity of the edge 44. This ensures that the idle travel mentioned in the introduction, when changing from the idle position to the clamping position and vice versa, is very small.

Another, commercially available freewheel, which is advantageous because of the small amount of food and also inexpensive, is shown in Fig. 5. It in turn comprises an inner part 45, an outer part 46 and clamping bodies 47 attached between them.

If the outer part 46 is rotated counterclockwise, the bodies 47 are pressed into their upright position, as a result of which they jam with the parts 45, 46.

A further embodiment variant is shown in FIG. 6, wherein instead of the lever 31 and the holder 30 (FIG. 3), two tooth segments 49 and 50 establish the mechanical connection between the freewheel, or the clutch 27 and the arm 25. The toothed segment 49 is fastened on the outer part 29 and is in engagement with a toothed segment 50, which is fixed coaxially to the axis 13 by means of screws 51 in the circumferential direction. This shifting option allows an engagement time to be set, from which the engagement in the toothed segment 49 is to take place. This in turn gives a measure of the food amount.

In the position shown, the pliers are in the rear position, i.e. the movement of tooth segment 50 or 49 up to this position has been fed via the feed cylinder in the return.

It is also possible to provide the same configuration of a freewheel 27 and toothed segments 49, 50 on the opposite bearing of the feed roller with the interposition of an idler gear between the toothed segments in order to carry out feeding in the forward and reverse directions.

Claims (10)

1. Drive device for a feed roller (20) of a combing machine, whereby the comb nippers carry out a reciprocating movement during the comb nip, said nippers being open in a front position and closed in a rear position, whereby the opening and closing of said comb nippers is effected by the swivelling movements of a nipper knife (14) which is attached to arms (14, 25, 42) swivellable at their one end, and, for effecting a step-by-step feed movement of the feed roller (20), one of the swivellable arms (12, 25, 42) being coupled with one end of the feed roller (20) through a coupling means (15, 21; 27, 31; 36, 40, 41), and that the coupling means (15, 21; 27, 31; 36, 40, 41) only comes into effect for the swivelling movements occurring in the one direction, characterized in that the coupling means (15, 21; 27, 31; 36, 40, 41) comprises a free-wheel (15, 27, 36) with an inner part (16, 28, 35, 45), an outer part (17, 29, 39, 46) and clamping members (18, 43, 47) disposed between said two parts, whereby the one of these parts is rigidly connected to the one end of the feed roller (20) and the other of said parts is rigidly connected to the holding device (19, 30, 37, 38), and that the coupling means comprises in addition a connecting rod (21, 31, 40, 41), said rod being attached to the one arm (12, 25, 42) and the holding device (19, 30, 37, 38) in a crank-like manner.

2. Device in accordance with claim 1, characterized in that the feed roller (20) is coupled to an arm (12, 25) at both of its ends, whereby in addition to the first coupling means (15, 21) a second coupling means (27, 31) is provided at the other end of the feed roller (20), and that the first coupling means (15, 21) is active during the opening movements and the second coupling means (27, 31) is active during the closing movements and alternatingly one of the coupling means (15, 21; 30, 31) or both coupling means (15, 21; 30, 31) are in operation.

3. Device in accordance with claim 1, characterized in that the outer part (39) of the free-wheel (36) comprises two holding devices (37, 38) which are arranged opposite from one another with respect to the rotational axle (48) of the free-wheel (36), and that a connecting rod (40) mentioned in claim 1 or a second connecting rod (41) is connected in a crank-like manner with the holding devices (37, 38) and the arm (25), and that during the opening movements of the nippers (14) a tractive force acts upon the one holding device (37) and during the closing movements of said nippers an impact force acts upon the second holding device (38) and that either the one connecting rod (40) or the other connecting rod (41) is selectively put into operation.

4. Device in accordance with claim 1, characterized in that by suitable selection of the position of the holding device and/or the attachment position (32, 33, 34) of the connecting rod (31) on the arm, it is possible to set the size of the traverse of the feed cylinder (20).

5. Device in accordance with claim 1, characterized in that the inner part (16, 28, 35) of the free-wheel (15, 27, 36) is attached coaxially to the feed cylinder (20).

6. Drive device for a feed roller (20) of a combing machine, whereby the comb nippers carry out a reciprocating movement during the comb nip, said nippers being open in a front position and closed in a rear position, whereby the opening and closing of said comb nippers is effected by the swivelling movements of a nipper knife (14) which is attached to arms (25) swivellable at their one end, and, for effecting a step-by-step feed movement of the feed roller (20), one of the swivellable arms (25) being coupled with one end of the feed roller (20) through a coupling means (27, 49, 50), and that the coupling means (27, 49, 50) only comes into effect for the swivelling movements occurring in the one direction, characterized in that the coupling means (27, 49, 50) comprises a free-wheel (27) with an inner part (28), an outer part (29) and clamping members (18, 43, 47) disposed between said two parts, whereby the one of these parts is connected to the one end of the feed roller (20) and the other of said parts is provided with a toothed segment (48) and that the coupling means comprises in addition a further toothed segment (50) connected to the one arm (25), whereby said second toothed segment mates with the first toothed segment (49) or may be brought to mate with said first toothed segment.

7. Device in accordance with claim 6, characterized in that the toothed segment (50) connected to the one arm (25) is attached coaxially to the swivelling axle (13) of the arm (25).

8. Device in accordance with claim 7, characterized in that the toothed segment (50) is detachably attached and swivellable about the swivelling axle (13).

9. Method for the step-by-step feed of a predetermined length of a fibre fleece in a combing nip of a combing machine through a feed cylinder, said cylinder being held in comb nippers carrying out a forward and reverse movement and carrying out step-bystep feed movements by the opening and closing of the combing nippers, characterized in that the predetermined length of the amount of feed of a combing nip takes place proportionally by the opening and closing of the comb nippers during the forward and reverse movement.

10. Method in accordance with claim 9, characterized in that the share of the amount of feed in the forward and reverse movement is selectable beforehand.

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