DE1207036B - Thread cutting device for circular knitting machines - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

D 04 b

German class: 25 a -25/05

Number. 1207036

File number: S 74298 VII a / 25 a

Filing date: June 12, 1961

Opening day: December 16, 1965

The invention relates to a thread cutting device for circular knitting machines, through which the on threads fed to the auxiliary system of a multi-system circular knitting machine, which can be switched off Laying out can be cut through as well as the unknitted thread ends of those newly inserted on the auxiliary system Threads can be cut and through which when inserting or. Switching off the auxiliary system the beginning or the end of the thread fed to the auxiliary system can be knitted through the first or last needles and can only be formed into stitches on the main system together with the thread supplied there, with the Thread cutting device one inside the needle circle with this circumferential toothed ring and has a cutting edge which cooperates with the toothed ring and which is in the immediate vicinity of the needle circle is attached to the stationary sinker cap inside the needle circle.

A single-system circular knitting machine with an auxiliary trigger lock part has become known, wherein the thread cutting and clamping device is in the middle of the dial. Due to the The distance between the needle circle and the cutting device remains a longer one Thread end of z. B. 2.5 to 5 cm, which normally had to be cut off manually. With another Relevant device, an arrangement is provided through which such a manual separation in failure comes. For this purpose, the loose end of the thread is compressed into the needles by means of compressed air fed and knitted into the fabric. Even if this way of working is not inconvenient, it leads but the indiscriminate knitting of the thread ends leads to a disadvantageous appearance of the knitted fabric, such as z. B. Women's stockings. To remedy this drawback, a device has been developed by means of cut the thread close to the needle circle by means of a toothed ring carried on the circumference of the dial and with a cutting blade under cutting of the thread cooperates on the circumference. The thread is cut off at approximately 180 ° away from the thread guide and associated cam. Here, however, it happens that the Short thread ends come loose from the needles when they are cut, creating a Defect results. This is because the needles open at the point where the thread is cut are so that the thread can emerge from the same. The invention is based on the task of the beginning and securely fasten the end of the thread fed to the auxiliary system in the goods.

Thread cutting device for circular knitting machines

Applicant:

Singer-Fidelity, Inc., Philadelphia, Pa. (V. St. A.)

Representative:

Dipl.-Ing. W. Meissner and Dipl.-Ing. H. Tischer, patent attorneys, Berlin 33, Herbertstr. 22nd

Named as inventor:

Peter A. Mahler, Philadelphia, Pa. (V. St. A.)

Claimed priority:

V. St. v. America July 12, 1960 (42 352) - -

This object is achieved in that the cooperating with the cutting edges of the rotating toothed ring Cutting edge is arranged in the area of the trigger lock part of the main system. By this measure according to the invention is achieved that the thread of the auxiliary system is only then cut is after the tongues of the first and last needles knitting this thread on Trigger lock part of the main system have been closed, and also that the one supplied to the main system Thread runs unaffected above the cutting edge.

The invention is explained below, for example, with reference to the drawings, which Show parts of a circular knitting machine equipped according to the invention.

F i g. Fig. 1 is a partial top plan view showing the dial lock cap of a multi-system circular knitting machine shows with a main and auxiliary system;

F i g. 2 is an enlarged partial side view of FIG

Sink lock cap taken along line 2-2 of Figure 1; F i g. 3 and 5 are sectional views through FIG

Sink lock cap along lines 3-3 or 5-5 of FIG. 1;

F i g. 4 is a partial perspective view of a

Thread cutting device as shown in FIG. 2 shown; F i g. 6 is one of the F i g. 2 similar view in

reduced scale, the dash-dotted lines the location of the lock parts relative to the location of the in FIG. Figure 2 shows the cutting element shown;

509 758/35

3 4

F i g. 7 is a partial perspective view showing the bracket 45 disposed, in turn, attached to the

Figure 10 shows operation of the thread cutting device; Sink lock cap 31 is attached. The cutting edge 44

F i g. 8 is a side view of the FIG. 7 ends at its free outer end in one after

showed device; downward projection 46, which is on the upper

F i g. 9 is a sectional view taken along line 9-9; 5 surface of tooth 24 of toothed ring 23 rests;

of Fig. 1, with a thread in full extension. As shown in Fig. 1, the projection 46 comes

Lines is shown so as to allow the operation of the intake manifold with the toothed ring 23 at a point a little before the

to explain; Auxiliary system 34 in engagement, so that the at the auxiliary

FIG. 10 is a partial top system 34 similar to FIG. 1, not laid and laid out threads

sees a modified aspect according to the invention of the separation by the projection 46 of FIG

leadership style; Cutting edge 44 are subject.

Figs. 11 and 12 are sectional views along the lines of the operation of the thread cutting device 28. Figs

Lines 11-11 and 12-12 of FIG. 10 in an enlarged view of the laid yarn YI z. B. by means of

th scale, and thread guide 36-2 through the needle circle 15 and the

13 is a partial perspective view of the gear ring 23 in FIG. 15 engaged with the projection 46 of FIG

11 and 12 shown device. Cutting edge44 brought. As shown in Fig. 1, occurs

With reference to the drawings, the thread YI via the sinker cap generally shows FIG. 1 to 9 explained my circular knitting machine in a straight line between the projection 46 and the one needle circle 15, which is arranged 20 36-2 away in a needle cylinder 16 for executing a cutting edge 44 and the retracted thread guide. As in FIG. As shown in Fig. 1, it occurs and carries containment sinkers 17 (see Fig. 3). Inner thread under the cutting edge 44 and the holder 45 half of the needle circle 15 is a rotatable rib under the outermost corner of the suction tube 39 under disk 21 is arranged. Dial 21 faces wire 48 through and then up to transfer sinkers 22 and also has raised thread guide 36-2. If the front of a toothed ring 23, which, as shown in FIGS. 1, 2 and 4 25 jump 46 with the cutting edge 26 of the tooth 24, is provided with teeth 24 on its circumference, the thread YI is cut, which have radial guide surfaces 25 and on and its severed end extending up into suction of its upper edge into a cutting edge 26. tube 39 drawn, with the thread YI then a stationary cam lock cap 31 is arranged on the layer adjacent to the other, non-working dial 21 and carries cut-off 30 threads Y-2 occupies, which extend from the non-acting elements and guide pins, as further is described individually below in the same thread guides 36 for the suction tube 39. stretch. It should be noted that the elongated shape

The needle circle 15 is surrounded by a tongue ring 32 of the nozzle of the suction tube 39, the non-working, which is interrupted by systems that -., Y-2 threads arranged in layers that are not in the present case by the reference numeral 33 35 path the movement of threads YI and Y-3 via the and 34 are indicated. The main system 33 are located at the upper end of the dial, whereby each has a plate 35 and several thread guides 36 influencing between the non-working and the. The auxiliary system 34 has a plate 37 and inserted threads are prevented
several thread guides 38 on. In accordance with a thread Y-3 is inserted by the thread guide 36-1 with the usual procedure of the needle 40 before laying out the thread YI . The cylinder and dial are rotated and the thread thread Y-3 is inserted by actuating the thread guide guides 36 and 38 at the same time as 36-1 in order to operate the thread downward from the needle cylinder 16 to be fed through a thread Suction tube 39 in the needle circle 15 into accessible device (not shown) that pull a. It should be noted that the thread cutting pattern drum and pattern chain, threads 45 device 29 to lay and lay out below the non-working thread. Suction pipes 39 or 40 dens Y-2 is arranged so that there is no possibility of the thread cutting device 29 to clamp the threads and sever the cut threads Y-2 over the dial around which they are not working. To remove the thread end from the machine by turning the needle cylinder, as in Fig. 16, the thread YI at the periphery of the sinker is described further below. 50 lock cap 31 out, the suction in the

A thread cutting device suction tube 39 is provided for each system, with the result that the thread YI a 28 and 29 is provided. Each thread cutting device on a straight path between the suction tube 39 and FIGS. 28 and 29 cooperates with the cutting edges 26 of the insertion point of the thread into the needle circle 15 on toothed ring 23 in order to remove the thread. The F i g. 9 shows the suture Y-3 in one cut overlying the cutting edge 26. The 55 middle layer is adjacent to the suction tube 39.So thread cutting device 28 for the main system 33 soon the needle circle 15 the point of engagement over which works in such a way that only the cut threads rotate beyond the middle layer, the end of the thread will be attached to the main system 33 inserted or withdrawn the Y-3 into engagement with the downward one; it does not take effect to bring projection 46 of cutting edge 44, cutting off the threads which are laid or laid out on auxiliary system 34 60 thread Y-3 from cutting edge 26 of the tooth. In the same way 44 extends into the suction pipe 39. When the tooth 24, the thread cutting device 29 for the auxiliary system 34 over the downwardly directed projection 46 is effective, in order only to be moved out by the thread, the thread Y-3 is severed; Its guide 38 inserted or laid out threads cut off end piece will cut through the suction tube 39. 65 removed, leaving only a very small end

The one explained in FIGS. 1 to 9 remains in accordance with the invention. Since the operation of the circular knitting machine too

According to the embodiment, the thread cutting has an overlap between the laid thread

Device 28 has a cutting edge 44 that leads on and the inserted thread, it does not

A significant problem is an effective attachment of the separated from the main system 33 To effect thread ends, so that the thread cutting device 28 is arranged at each point can be, where the same in the inserted threads on the auxiliary system 34 is not effective, but in the on the main system 33 laid and laid out threads is effective.

According to the invention, the thread cutting device 29 for the auxiliary system 34 is on the next adjoining one System arranged in such a position that the tongues 72 of the needles 15 are in are in a position to define the severed thread end within the hooks of the needles 15. to for this purpose the thread cutting device 29 is arranged adjacent to the main system 33. As in FIG. 2, the thread cutting device 29 has a flat cutting element 51, which has a downwardly directed cutting edge 52 at its free outer end, which with the teeth 24 of the ring gear 23 cooperates and rests on the same. At its opposite end the cutting element 51 is arranged in a holder 52 α, one of which is integral with the same trained thread deflection device 53 has. The thread deflector 53 ensures that the Threads from the thread guides 38 pass under the cutting element 51, so that the same be severed by the engagement of the cutting edge 52 with the teeth 24.

In the operation of the thread cutting device 29, as shown in FIGS. 1-8, yarn Y-4 is shown being laid out by yarn guide 38-2. The thread YS has been inserted by the thread guide 38-3, and the thread Y-6 is held in the inoperative position by the thread guide 38-1. As in FIG. 1, the threads Y-4 and Y-6 pass under a wire 56 and are raised above the level of the sinker cap 31 by a wire 57 (see FIG. 5), which reduces the tension on the threads and that Lifting of the threads supported by the suction tube 40. The threads then pass around guide pins 58, 59, 60, which prevent the threads from tangling on dial 21. The Y-6 thread is drawn up into the suction tube 40; thread Y-4 continues around dial 21, passing through pins 61, 62 and 63. Finally, the thread Y-4 is guided through the needle circle 15 and the toothed ring 23 under the cutting element 51. It should be noted that the final group of needles shown in FIGS. 1, 7 and 8, denoted by the reference numeral 15-4, are not drawn off on the auxiliary system 34 to a certain height, so that they carry the thread Y-4 within their open hooks which the thread Y-3 on the main system 33 take up, whereby two loops are formed on the needles 15-4, so that the transition from one to two-system knitting and vice versa, the beginning and end of the thread, which is fed to the auxiliary system, which is switched on or off, are anchored in the goods.

As in FIG. 6, the cutting edge 52 of the cutting element 51 is arranged in the region of the trigger lock part 70, which pulls the needles 15 off to a certain height. The needles 15 are conventional latch needles with a hook 71 and a rotatable tongue 72. As soon as the pivot point of the tongue 72 is guided from above to below the sinker height 17, the loop previously knitted from the thread YI and located on the needles 15 lifts the tongues 72 so as to close the hook 71 in the usual way. As clearly shown in FIG. 8, the arrangement of the cutting edge 52 in the area of the trigger lock part 70 means that the tongue 72 is then closed against the hook 71

ίο becomes when the thread end Y-4 is cut. With this arrangement, the severed and last end of the thread Y-4 to be knitted is thus caught in the needle hook 71 and knitted as an appropriate fastening. When the thread Y-4 is severed, the suction tube 40 pulls the severed and not knitted-in other end of the thread Y-4 away from the cutting element 51 and into the suction tube 40, where the same takes up a position adjacent to the thread Y-6 .

ao A similar effect occurs when the thread Y-5 is brought into engagement with the cutting element 51 by the needle circle 15 and the toothed ring 23. The thread YS extends at this point from the cutting element 51 around the guide pins 63, 62 and 61 into the suction tube 40. When the thread YS passes the downwardly directed cutting edge 52 of the cutting element 51, it is severed and its severed end is pulled off the dial by the suction in the suction tube 40. The knitted-in end of the thread Y-5 is, as is the case in connection with the thread Y-4 , inserted into the hook 71 of the needles 15 through the tongues 72 and then knitted with it.

It should be noted that a first group of needles, which is indicated in FIG. 1 by the reference numeral 15-5 is not deducted from the auxiliary system 34 to a certain height, so that they carry thread Y-5 within their open hooks and thread Y-3 on the main system 33 record.

The result is that the thread cutting device 29 can optionally be arranged further away from the trigger lock part 70 if a device is provided which ensures that the thread cutting device 29 does not cut off the threads laid and laid out on the main system 33. For this purpose, the cutting edge 52 of the cutting element 51 is to be arranged according to the invention in that area of the trigger lock part 70 in which the needle tongues 72 are in the closed position in order to prevent the severed thread end from emerging from the hook 71. Due to the arrangement of the cutting edge 52 at this point, the thread Y-3 inserted in the main system 33 is drawn down into the teeth 24 of the toothed ring 23 when the trigger lock part 70 passes directly past the cutting element 51.
Another form of thread cutting device is shown in FIGS. 10 to 13 explained. In this embodiment according to the invention, the thread cutting device 28 described above is replaced by another thread cutting device 128.
The thread cutting device 128 has a

6g cutting edge 130 which is arranged in a holder 131; the latter is rotatable on a mounting bracket 132, as indicated by reference numeral 133. The mounting bracket

tion 132 is pivotally hinged to the sinker cap 31 near its center, as indicated by reference numeral 134. The weight of the bracket 131 causes the same to rest on the surface of the sinker cap 31. A spring 135 is under tension between the fastening bracket 132 and the bracket 131 so as to press the cutting edge 130 into engagement with the toothed ring 23 , the displacement of the bracket 131 being limited by a limiting pin 136 which is connected to the bracket 131 is in thread engagement and rests against the mounting bracket 132. An actuating lever 138 comes to the holder 131 into engagement and can be actuated so that the cutting edge can be lifted 130 out of engagement with the toothed ring 23, as shown by the dashed lines of Fig. 12, when the operation lever 138 by the Pattern device of the circular knitting machine is operated.

The thread cutting device 128 is operated by the actuating lever 138 so that the cutter 130 is raised when the threads inserted in the auxiliary system 34 are guided past the thread cutting device 128 by the needle circle 15 and the toothed ring 23 so that the thread cutting device 128 does not cut these threads , and that the same are guided to the thread cutting device 29 in order to carry out the severing here when the tongues 72 of the needles 71 are raised in order to catch the severed thread end in the hooks of the needles. The actuating lever 138 is actuated in order to bring the blade 130 into engagement against the toothed ring 23 only when threads are being laid and laid out on the system, the threads being guided to the thread cutting device 128 in alignment. The thread cutting device 128 thus enables the threads inserted and laid out on the main system 33 to be severed at the thread cutting device 29. It should be noted that the thread ends severed by the thread cutting device 128 have been knitted with the subsequent row of stitches on the auxiliary system 34 , so that there is no possibility of incorrect attachment of the thread end.

If necessary, similar actuating levers for the cutting edges 44 and 51 can be provided on the actuating lever, which release the projections 46 and from the toothed ring 23 when the threads are not being laid or laid out on the corresponding systems 33 and 34.

Claims (1)

Claim: Thread cutting device for circular knitting machines, through which the can be switched off Auxiliary system of threads fed to a multi-system circular knitting machine during their laying out can be cut through as well as the unknitted thread ends of the threads newly inserted on the auxiliary system can be cut off and by which when inserting or. Turning off the auxiliary system the beginning or the end of the thread fed to the auxiliary system can be knitted by the first or last needles and can only be formed into stitches on the main system together with the thread fed there, the thread cutting device one inside the needle circle with this circumferential toothed ring and one with the toothed ring has cooperating cutting edge that is in the immediate vicinity of the needle circle on the stationary sinker lock cap is attached inside the needle circle, characterized in that that the cooperating with the cutting edges (26) of the rotating toothed ring (23) Cutting edge (52) arranged in the area of the trigger lock part (70) of the main system (33) is. Considered publications:
U.S. Patent Nos. 2,824,436, 2,269,757. 1 sheet of drawings 509 758/35 12.65 © Bundesdruckerei Berlin