CH638843A5 - Garnzufuhrapparat. - Google Patents

Description

638843

2nd

PATENT CLAIMS

1. yarn feed apparatus, characterized by a) a bobbin (12) which has a hollow shaft (13) which is provided at both ends with a flange disc (14, 15), each having a plurality of angularly spaced apart have guide slots (34) extending from the inside to the outside,

b) a spindle (25) passing through the hollow shaft and rotatable relative to it,

c) two drive gearwheels (26, 27) fixed on the spindle next to the flange disks,

d) two sets of driven gear wheels (31, 32), which are mounted on the one or the other flange disc and mesh with the one or the other drive gear, those of one set being axially aligned with those of the other set, and e) one A plurality of rods (36) distributed in a ring around the hollow shaft and parallel to it, the end parts of which extend through the said guide slots of the flange disks and are mounted eccentrically on a driven gear wheel of the one or the other set in order to rotate the spindle with respect to the hollow shaft to be jointly removed from its axis of rotation or to be approximated to it.

2. yarn feeder according to claim 1, characterized in that in each set of driven gears (31) such an axial displacement of the same is provided that they do not interfere with each other.

3. Yarn feeder according to claim 1, characterized in that the rods have a circular cross-section.

4. Yarn feeder according to claim 1, characterized in that the flange disks have an outwardly directed outer edge flange (16) on which a cover disk (18, 19) covering the adjacent gear wheels (26, 31; 27, 32) is seated.

5. Yarn feeder according to claim 4, characterized in that one (18) of the cover disks is provided with a projection which is designed for coupling to a drive shaft.

6. Yarn feeder according to claim 5, characterized in that a button (30) is attached to the end part of the spindle projecting from the other (19) cover disk.

Known weft feeders generally have a spool on which the weft thread is wound and from which this weft thread can be drawn off at a constant speed, in order then to be fed to a weft thread carrier after the rotation of the bobbin has given in time in accordance with the actuation of the weft thread carrier. There is now a need to incorporate a device into the weft feed device which serves to change the speed of the weft feed depending on the respective need for yarn for different widths of the fabrics to be produced or also to compensate for variable yarn stretchability or extension depending on the ambient temperature and humidity.

An object of the invention is therefore to provide a yarn feeder which enables a yarn to be fed at different conveying speeds with the same constant rotational speed of the yarn feeder. Associated with this is the task

to be able to continuously change the thread take-up diameter.

The solution to this problem is seen in an education as defined in the characterizing part of claim 1.

With regard to special features of an embodiment of the subject matter of the invention, reference is made to claims 2 to 6. The invention is explained below with reference to the accompanying drawing, for example. Show it:

1 is a schematic plan view of a needle loom in which the yarn feeder according to the invention is used,

2 is a perspective view of the yarn feeder,

3 is a longitudinal section of the yarn feeder illustrated in FIG. 2;

4 shows a cross section along the line 4-4 of FIG. 3,

5 is a cross section corresponding to FIG. 4, but in which another operating position of certain rods belonging to the feed apparatus is illustrated, and

6 and 7 cross sections along the line 6-6 and 7-7 of Fig. 3rd

The loom 1 shown schematically in FIG. 1 has a plurality of harnesses or strands 2, which serve to separate a plurality of warp threads 3 from one another in order to form looms in a chronological order; it also has a reed or a reed 4 which can be moved back and forth in the direction of the chain in order to strike the respectively inserted weft thread against the goods edge of a narrow fabric strip 6 which is being produced; it also has a weft carrier 7 which can be pivoted about an axis (not shown) in order to insert a weft thread 5 through the respective shed; Finally, it has a latch needle 8 which extends along the one fabric edge and can be moved back and forth in its longitudinal direction and serves to catch the weft thread that has been inserted and to knit it with pre-formed stitches or loops in order to form the corresponding selvedge. The loom also has a weft feeder 9, which can be actuated in accordance with the actuation of the weft carrier 7 for feeding a weft thread 10, and a tension balancer 11, which is effective between the weft carrier 7 and the feeder 9 and serves the weft 10 under constant tension while this weft is fed to the weft carrier 7.

As best shown in FIGS. 2 and 3, the weft feeder 9 has a bobbin 12 to which a hollow shaft 13 belongs, which is provided at both ends with a flange disk 14 and 15, respectively. These flange disks have on their outer edge an outwardly facing flange or ring projection 16 or 17, on which a cover disk 18 or 19 is placed. A transmission chamber 20 or 21 is therefore present between each flange plate and the cover plate adjacent to it. The cover plate 18 has on its side facing away from the coil an axial extension 22 with recess 23 for the rotationally fixed reception of one end of a drive shaft 24 (which is only indicated in FIG. 1), which rotates at a constant speed about its own axis during the Operation of the loom.

A spindle 25 extends coaxially through the hollow shaft 13 and is rotatably supported in the cover disks 18, 19. Two driving gears 26, 27 are fixed on the spindle 25 and are located, one in the gear chamber

5

10th

15

20th

25th

30th

35

40

45

50

55

60

65

20 and the other in the gear chamber 21. The spindle 25 has an externally threaded end part 28 which protrudes from the cover plate 19. A fixing nut 29 and a knob 30 with a rounded outer surface are screwed onto this end part; the button 30 is fixed on the end part 28, whereby it is possible to turn the spindle 25 about its axis by turning the button 30 by hand; but it is also possible to fix the spindle in relation to the cover plate 19 by tightening the locking nut 29 against this cover plate 19.

In each of the two gear chambers 20, 21 there is a plurality (there are six in the exemplary embodiment shown) of driven gear wheels 31 and 32, respectively. These are mounted on pivots 33 which are attached to the cover plate 14 or 15 and possibly also to the adjacent cover plate 18 and 19 are mounted. The pivots 33 are evenly distributed in a ring concentrically surrounding the geometric axis of the spindle 25 and the hollow axis 13 and the gears continuously mesh with the driving gear 26 and 27, which surround them. There are thus two sets of such driven gearwheels 31 and 32, the gearwheels 31 of one set being aligned axially with those 32 of the other set. In each set, the gears 31 and 32, which are adjacent to one another in the circumferential direction, are offset from one another in the axial direction, as can be seen from FIG. 3, so that they do not interfere with one another during their rotation.

Each of the flange disks 14, 15 has guide slots 34 in a number equal to that of driven gears 31 located adjacent to it and in an arrangement best seen in FIGS. 4 and 5. These guide slots 34 extend as arc slots along a semicircle, the center of which is located on the axis of one of the pivots 33 and the two ends of which are located on a radius of the flange disk. Each arch slot 34 has a further part which opens out on the space between the flange disks and which is separated from the narrower part by a shoulder 35. The guide slots 34 in the flange plate 14 are aligned with those in the flange plate 15 in the axial direction of the spindle 25.

Yarn support rods also extend in this direction

3 638843

36, the number of which corresponds to that of the driven gear wheels 31 in a set of such gear wheels and which are evenly distributed on the circumference of the hollow shaft 13. Each of the rods 36 has s trunnions 37, 38 inserted at its two ends; these extend loosely through one of the guide slots 34 in the flange disk 14 or 15 and are attached eccentrically to one of the driven gear wheels 31 or 32. The end parts of the rods 36 are guided in the other parts of the guide slots 34. 10 The weft yarn 10 surrounds the roller-like set of yarn support rods 36 over several turns when the feed apparatus is in use. It is positively advanced when the yarn feeder 9 rotates about its own axis at a constant speed.

If the conveying speed of the weft thread 10 is to be changed, the knob 30 is rotated so as to also rotate the spindle 25 relative to the bobbin 12. This causes, via the drive gears 26, 27, which are stuck on the 20 spindle, a rotary adjustment of the driven gears 31, 32 around their trunnions 33, as a result of which the trunnions 37, 38 together with the yarn support rods 36 move along the guide slots 34, that is to say from the common axis the spindle 25 and the coil 12 are removed or approximated to them (FIGS. 4 and 5). As a result, the diameter of the roller-shaped set of yarn support rods 36, around which the weft yarn 10 is wound, is of course changed accordingly, which, with the speed of the feed apparatus 9 unchanged, results in a corresponding change in the advance speed of the weft yarn 10.

Since the yarn support rods 36 are supported at both ends and driven during their adjustment, they are moved smoothly and evenly after the rotational movement of the driven 35 gears 31, 32 inwards or outwards in such a position adjustment. Such an adjustment movement of the yarn support rods 36 can be finely adjusted by actuating the button 30.

It goes without saying that various changes could be made to the illustrated and described exemplary embodiment within the scope of the present invention.

2 sheets of drawings