JP2732907B2 - Draft mechanism for spinning machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a draft mechanism for a spinning machine, in particular, a bottom roller fixedly provided in a roller stand and a top roller belonging to these bottom rollers,
Draft mechanism of the type in which these top rollers are held by a weighting arm provided on a roller stand and these top rollers can move away from the bottom roller by the swinging of the weighting arm. About.

A known (European Patent Publication No.
0 062 185), a relatively narrow tolerance is maintained with respect to the pivoting support of the weighting arm and with respect to the individual holdings of the top rollers, whereby the adjustment between the top and bottom rollers is achieved. Position and especially the parallelism between the rollers of a roller pair must be guaranteed. Similarly, a high rigidity must be given to the weighting arm.

The problem underlying the present invention is to simplify the drafting mechanism of the type described at the outset, and to ensure a precise alignment between the rollers with sufficient reliability.

The problem is that the roller stand has a guide,
The problem is solved in that at least one of the top rollers is guided in a closed state in these guides and is oriented in the direction of the bottom roller.

In this configuration, since the top roller is aligned with the bottom roller along the guide portion of the roller stand,
The stiffness and manufacturing accuracy of the weighting arms themselves no longer need to play a decisive role in ensuring correct alignment of the rollers with each other.

According to another configuration of the present invention, the top roller is held by elastically flexible holding means. This allows the guide of the roller stand exclusively to determine the position of the top roller without over-adjustment. In this case, since the holding means is elastically flexible, the error relating to the feed movement can be easily balanced.

According to another embodiment of the invention, the shaft of the top roller has two parallel guide surfaces, each of which has a guide that is substantially radially oriented with respect to the bottom roller to which it belongs. I have. In this way, a clear and constant alignment is maintained.

According to another embodiment of the invention, it is a component of a holding device which is provided on a roller stand so as to be adjustable in the circumferential direction of a bottom roller to which a guide for at least one of the top rollers belongs. Thus, the top roller, which can be adjusted even in the circumferential direction of the bottom roller, is accurately aligned with the bottom roller. Of course, the top roller must be held correspondingly adjustable.

The present invention will be described in detail with reference to the embodiments illustrated in the accompanying drawings.

The draft mechanism schematically shown in FIG. 1 is a roller stand
It comprises three bottom rollers 11, 12, 13 which are fixedly arranged in 10 and driven in a manner not shown in detail. Top rollers 15, 16, 17, 18 belong to these bottom rollers 11, 12, 13; in this case, roller pairs 13, 18, 12 and 17 define the brake draft zone and roller pairs 12, 16 and 11 , 15 form the main draft zone. The top rollers 15, 16, 17, 18 are held on both sides by weighting arms 14, which can swing about a swing axis 23 parallel to the bottom rollers 11, 12, 13 Are supported by the roller stand 10. The illustrated working position of the weighting arm 14 can be locked in a manner not shown in detail. By lifting the weighting arm 14, the top roller 1
5, 16, 17, and 18 are pivotally separated from the bottom rollers 11, 12, and 13, so that the draft mechanism is widely opened to allow access.

The top rollers 15, 16, 17, and 18 have a shaft body 21,
The shaft is defined by two laterally parallel surfaces. The top rollers engage these shafts 21 in guides 19 which are essentially radially oriented with respect to the bottom rollers 11, 12, 13 to which they belong. Weighting arm
When the shaft 14 is closed, the shafts 21 reach the corresponding guides 19. As will be described in detail later, these shafts 21 are elastically held in the transverse direction with respect to the guide surface, so that these shafts easily enter the guide portion 19 when the weighting arm is closed. Can be included.

Guides 19 for the top rollers 15, 17 are provided directly in the roller stand 10. The top rollers 15, 17 are held in the weighting arm 14 without changing its position. On the other hand, to adjust the latch,
The top rollers 16, 18 are provided so as to be adjustable in the circumferential direction of the bottom rollers 12, 13 to which they belong. For example, top roller
A slit guide portion 50 is formed with respect to 16, and a holding member 51 of the top roller 16 is guided in this guide portion so as to be adjustable. When the weighting arm 14 is in the closed state, the slit guide section 50 is concentrically directed to the bottom roller 12 to which the slit arm 50 belongs. A corresponding adjustability is also provided for the top roller 18. Top roller
The guides 19 for 16, 18 are components of a holding device 22, which are mounted in a roller stand concentrically with respect to the bottom rollers 12, 13 and are rotatable. The guides 19 of these holding devices 22 therefore maintain their corresponding alignment with respect to the bottom rollers 12, 13 each time an adjustment is made.

As can be seen from FIG. 1, the top rollers 15, 17 are provided with a pressure device in the form of a hydraulic or pneumatic pressure member 30. The top rollers 16, 18 can be provided with a pressing device in a suitable manner. However, it is also possible for these top rollers to be provided with other types of pressing devices, as will be explained in more detail later in this specification.

Of course, not all the top rollers 15, 16, 17, 18 need to be guided in the guides of the roller stand 10. In particular, a breach draft zone is not required in the direction of the entrance. Thus, in the embodiment according to FIG. 2, the top roller 18 can be adjusted in the guide 29 of the weighting arm 14 and also carries a pressure element 27 for the top roller 18. Therefore, it is held.

In the case of the embodiment according to FIG. 2, there is provided, in particular, a power-driven adjusting drive 24 for the holding device 22. The adjusting drive comprises, in particular, a shaft 52 which can be adjusted by power and possibly by hand, which drives the crank 53.
A sliding crank 54 is pivotally mounted on this crank, and is connected to the holding device 22 for the sliding crank itself. Axis 52
Extends laterally throughout the draft mechanism,
Advantageously, the holding devices 22 provided on both sides are connected so that they operate synchronously.

The holding device 22 of FIG. 2 shown enlarged in FIG.
Further carries a pressure device 25 which can be connected to the top roller 16 which is in the working position. The holding device 22 provided on both sides of the roller has a plate-like shape, and has a cylindrical extension 31 rotatably provided in the roller stand 10. Therefore, the holding device 22 is rotatable in the roller stand 10. The bottom roller 12 is supported by a bearing 32 in the extension 31. On the side opposite to the working side of the bottom roller 12 and the top roller 16, the holding device 22 has an extension 41 having a substantially square or rectangular cross section as an extension of the extension 31 via the collar 70. A hydraulic or pneumatic pressurizing body 35 is provided in the extension 41, and a piston of the pressurizing body is provided.
The roller 36 can be extended radially away from the bottom roller 12 and the top roller 16 so as to be separated therefrom. The piston 36 is supported on a stirrup 33 by a piston rod, which is formed by two connecting plates 34 and locking bolts 37. The hook-shaped end 38 of the shaft 21 of the top roller 16 belongs to the locking bolt 37, and the shaft 21 can be suspended on the hook-shaped end. A link guide portion is provided on a side surface of the extension portion 41. The link guide portion includes a notch that is directed in the radial direction with respect to the bottom roller 12, and a notch that is inclined with respect to the notch. Is formed from. The guides 39 of the connecting plate 34 engage in these notches. Thus, with the piston 36 inserted, the stirrup swings outward, so that the locking bolt 37 occupies the position 37 'in FIG. 3 and, accordingly, the end of the shaft 21 of the top roller 16. Released from the department.

The shaft body 21 of the top roller is guided in a guide portion 19 projecting from the plate-shaped base roller stand 10 of the holding device 22. The shaft is held by the weighting arm 14 via a holder 20 (shown in detail in FIG. 4). The holder 22 consists of a clamping body 55 which accommodates the shaft 21 between itself and which is accommodated by a stirrup 57 via a rubber-elastic member 56. . This stirrup is guided in the support guide 50 by bolts 61. A guide rod 58 is attached to the stirrup 57.
This guide rod, along with the sliding guide 59, along the other rod 60, is always in the slit guide when the adjustment is performed, in the radial direction of the shaft 21 with respect to the guide 19 of the roller stand 10 or with respect to the holding device 22. It is guided so that the direction is maintained.

As a variant of the embodiment shown, the shaft of the top roller 16
The holding body 20 for 21 is not provided on the weighting arm 14, but is provided on the holding device 22 via the swing arm. In this case, when adjusting the holding device 22, the top roller 16
Are also adjusted together. The weighting arm then serves to move the top roller to its working position in its swinging position.

[Brief description of the drawings]

1 is a diagram of a first embodiment of a draft mechanism schematically illustrated, FIG. 2 is a diagram of another embodiment of the draft mechanism, and FIG. 3 is a partial view in the area of a roller stand and a weighting arm. FIG. 4 is a detailed view of FIG. 2 shown in a cross-sectional view, and FIG. 4 is a view of the weighting arm shown in the direction of arrow IV together with a holding portion for the shaft of the top roller. Reference numerals in the figure are 11, 12, 13 ... bottom roller, 14 ... weighting arm, 15, 16, 17, 18 ... top roller, 19 ... guide part, 20 ... holding part, 21 ... shaft Body, 22 ... holding device, 28 ...
... holding member, 29 ... guide part, 31 ... extension part, 32 ... bearing, 36 ... piston, 37 ... locking bolt, 38 ... hook-shaped end part, 39 ... guide pin, 55 ... Tightening body, 57 ... Stirrup, 58 ... Guide rod.

Claims (10)

(57) [Claims] 1. A drafting mechanism for a spinning machine, particularly comprising a bottom roller fixedly provided in a roller stand and a top roller belonging to these bottom rollers,
Draft mechanism of the type in which these top rollers are held by a weighting arm provided on a roller stand and these top rollers can move away from the bottom roller by the swinging of the weighting arm. In the roller stand (10)
Are provided with guides (19), in which at least one of the top rollers (15, 16, 17, 18) is guided in a closed state and in the direction of the bottom rollers (11, 12, 13). A draft mechanism for a spinning machine, wherein the draft mechanism is configured to be oriented. 2. Draft mechanism according to claim 1, wherein the top rollers (15, 16, 17, 18) are held by elastically flexible holding means (20). 3. A guide in which the shafts (21) of the top rollers (15, 16, 17, 18) are substantially radially aligned with the associated bottom rollers (11, 12, 13). Draft mechanism according to claim 1 or 2, comprising two parallel guide surfaces (22) to which the part (19) belongs. 4. A roller stand (10) which is adjustable in the circumferential direction of a bottom roller (11, 13) to which a guide (19) for at least one of the top rollers (15, 16, 17, 18) belongs. The draft mechanism according to any one of claims 1 to 3, wherein the draft mechanism is a component of a holding device (22) provided in (1). 5. A top roller (16, 18) belonging to an adjustable guide (19) of a roller stand (10) is locked in an adjustable and adjusted position on a weighting arm (14). Draft mechanism according to any one of the preceding claims, wherein the draft mechanism is held as possible. 6. A roller stand (10) provided rotatably concentrically with respect to a bottom roller (12, 13) to which a holding device (22) belongs. Draft mechanism according to one. 7. Draft mechanism according to claim 6, wherein the adjustable holding device (22) comprises an adjusting drive mechanism (24). 8. A holding device (22) in which a bottom roller (12, 13) is held in a roller stand so as to be rotatable concentrically with respect to each of the bottom rollers (12, 13).
Draft mechanism according to any one of claims 1 to 7, supported within. 9. The holding device (22) is provided with pressurizing means (25) for the top roller (16) belonging thereto, and these pressurizing means are used when the weighting arm (14) is closed. The draft mechanism according to any one of claims 1 to 8, wherein the draft mechanism is configured to be able to engage with the top roller (16). 10. A top roller (16) belonging to an adjustable guide (19) of a roller stand (10) is held by a holding device (22) via a swing member and a weighting arm. The draft mechanism according to any one of claims 1 to 9, wherein the draft mechanism is configured to be shiftable to a working position by (14).