EP0238797A1 - Flat bed knitting machine provided with two needle beds and sinkers between the needles - Google Patents

Abstract

The plates (33, 33.1) of the two needle beds (22, 23), which can be pivoted until a closed bridge over the comb gap (50) of a two-bed flat knitting machine, have a wedge edge (44) which, in the knitting pull-off direction (53), forms below the bridge Projections (46) of the sinkers (33, 33.1) is formed, which ensures that the old stitches (47) are held down securely in the comb gap (50) and a compensating-compensating movement can be carried out by means of the sinkers (33, 33.1).

Description

The invention relates to a double-bed bottle knitting machine with needles which are longitudinally displaceable in its needle beds and between the needles about a common longitudinal axis between a rear and a front position and which are controlled by lock parts of the carriage and which are in the stitch formation region with a projection, a stitch-receiving throat formed below the projection and are provided with a curling edge.

Flat knitting machines with the features mentioned above are known (CH-PS 73 088; DE-OS 15 85 083). The pivotable sinkers are intended to replace a wedge edge on the needle beds and, with their stitch-receiving throat, hold back the stitches hanging on the needles when the needles are driven out. This happens with modern flat knitting machines running at higher speeds The problem of holding down the so-called old stitches from the working area of the needle heads when grasping the thread to form new stitches or tuck handles is increasingly emphasized. Attempts have so far been made to press the old stitches downward in the direction of a knitted fabric take-off device with the aid of scrapers which are moved along with the carriage of the flat knitting machine and which dip into the comb gap of the flat knitting machine. However, strikers have the disadvantage that they are direction-dependent and therefore have to be switched over when the carriage is reversed. Different types of stripes are also required for different types of knitting, so that the strippers have to be replaced frequently. Further disadvantages are that a stripper always affects several stitches lying next to each other at the same time and that the strippers, which are generally made of wire, can easily bend, which favors thread snagging. Strippers also make it difficult to see into the comb gap and often collide with tongue opener brushes on flat knitting machines. For some patterns that require needle bed displacement, the strikers must even be turned off so that they cannot operate there at all.

The previously known and interacting with the needles of the two needle beds of the flat knitting machine do not allow an optimal solution to the problems at hand, because with them the winding of the thread and the processing of the selected thread make it difficult. In the known sinkers, the threads are spliced in front of the stitch take-up groove, namely in the knitting pull-off direction, namely on a sinker projection delimiting the stitch take-up groove. This is the possibility of Control of the sinkers is restricted because the selected thread must be able to slide down over the sinker protrusion that delimits the stitch take-up throat. There must be a gap between the interacting sinkers of the two needle beds, which allows the selected thread to slide on the sinkers. However, despite the stitch-taking throats, there remains the not inconsiderable danger in high-speed machines that an old stitch is pulled upward from the comb gap by the needles that are in the process of being driven out.

The invention has for its object to design the sinkers of a two-bed flat knitting machine of the type mentioned so that a retention of the stitches from the area where the needles are driven out is reliably guaranteed without having to accept disabilities or restrictions in normal knitting operation.

The object is achieved according to the invention in that the wedge edge of the sinkers is formed in the knitting pull-off direction to and below the thread take-up throat and in that the sinkers of the two needle beds face each other and lie in their forward position with their projections spanning the ridge gap. Advantageously, the sinkers behind and somewhat below the wedge edge can have a short circular slot which has a closed edge and through which a wire which forms the stitch wiping edge of the needle bed in question is passed.

In the flat knitting machine designed according to the invention, the thread is placed over the sinkers below the projection of the sinkers which closes off the ridge gap. Slipped thread loops do not slip over the projections of the boards, which gives you a free hand when controlling the boards. After completing the culvering process, the stitches formed are exposed and are not enclosed by the sinkers, so that needle bed displacement and a transfer of stitches can take place without hindrance. It is no problem to start knitting with empty needles. An adjustment movement of the sinkers in the direction of closing the comb gap during the last part of the withdrawal movement of the needles also makes it possible to compensate for a stitch length by means of the sinkers, as is the case when knitting with the needles of only one of the two needle beds, due to the wedge edge located underneath the sinker closure to maintain the same mesh length is desirable. The needle beds continue to have their own tapping edge in the familiar form of a wire.

Interruption can be omitted. The machine is always operated with the same sinkers, regardless of whether single-surface or double-surface knitwear is manufactured. The holding down of the old stitches is fully secured, which reduces the dependency and thus the importance of the formation of a knitting device arranged below the comb gap. Even devices for keeping the knitted fabric wide are becoming less important. The stitch of each needle is individually retained by the associated board. An increase in The operating speed of a flat knitting machine designed according to the invention no longer poses any problems with regard to the retention of the knitted fabric.

An exemplary embodiment of a flat knitting machine designed according to the invention is explained in more detail below with reference to the parts essential to the invention with reference to the accompanying drawing.

• Fig. 1 eine schematische Darstellung eines Strick­schlosses der Flachstrickmaschine mit zuge­ordneten Platinensteuerschloßteilen;
• Fig. 2 einen Teilquerschnitt durch die beiden Nadelbetten im Bereich des Kammspaltes der Flachstrickmaschine an der Schloßstelle II in Fig. 1;
• Fig. 3 eine Einzeldarstellung einer Platine der Flachstrickmaschine;
• Fig. 4 eine Einzeldarstellung eines Maschenbild­nervorsprunges der Nadelbetten;
• Fig. 5 eine der Fig. 2 entsprechende Darstellung an der Schloßstelle V in Fig. 1;
• Fig. 6 eine der Fig. 2 entsprechende Darstellung von der Schloßstelle VI in Fig. 1 bei der Herstellung eines einflächigen Gestrickes;
• Fig. 7 eine der Fig. 2 entsprechende Darstellung an der Schloßstelle VII in Fig. 1 bei der Herstellung eines einflächigen Gestricks,
• Fig. 8 eine der Fig. 2 entsprechende Darstellung an der Schloßstelle VIII in Fig. 1 bei der Herstellung einer einflächigen Strick­ware;
• Fig. 9 eine der Fig. 2 entsprechende Darstellung an der Schloßstelle IX in Fig. 1 bei der Herstellung einer einflächigen Strickware;
• Fig. 10 eine Teildraufsicht auf den Kammspalt­bereich der Flachstrickmaschine an der Schloßstelle IX bei der Herstellung einer einflächigen Strickware;
• Fig. 11 - 16 den Fig. 2 und 5 - 9 entsprechende Darstel­lungen an den Schloßstellen II, V - IX in Fig. 1 bei der Herstellung eines doppelflä­chigen Gestrickes;
• Fig. 17 eine Teildraufsicht auf den Kammspalt­bereich der Flachstrickmaschine an der Schloßstelle IX bei der Herstellung eines doppelflächigen Gestrickes.

In detail show:

• Figure 1 is a schematic representation of a knitting lock of the flat knitting machine with associated sinker control lock parts.
• 2 shows a partial cross section through the two needle beds in the area of the comb gap of the flat knitting machine at the lock point II in FIG. 1;
• 3 shows an individual illustration of a circuit board of the flat knitting machine;
• 4 shows an individual illustration of a mesh formation projection of the needle beds;
• FIG. 5 shows a representation corresponding to FIG. 2 at the lock point V in FIG. 1;
• 6 shows a representation corresponding to FIG. 2 of the lock point VI in FIG. 1 in the production of a single-surface knitted fabric;
• 7 a representation corresponding to FIG. 2 at the lock point VII in FIG. 1 in the production of a single-surface knitted fabric,
• 8 shows a representation corresponding to FIG. 2 at the lock point VIII in FIG. 1 in the production of a single-surface knitted fabric;
• 9 shows a representation corresponding to FIG. 2 at the lock point IX in FIG. 1 in the production of a single-surface knitted fabric;
• 10 shows a partial top view of the comb gap area of the flat knitting machine at the lock point IX during the production of a single-surface knitted fabric;
• 11 - 16 representations corresponding to FIGS. 2 and 5 - 9 at the lock points II, V - IX in FIG. 1 during the production of a double-layer knitted fabric;
• Fig. 17 is a partial plan view of the comb gap area of the flat knitting machine at the lock point IX in the manufacture of a double-faced knitted fabric.

The schematic representation of a knitting lock of the carriage, not shown, of the flat knitting machine in FIG. 1 shows a lock channel 20 for controlling the needles 21 of the front needle bed 22 or the needles 21.1 of the rear needle bed 23 (Fig. 2) of a flat knitting machine. The needle control curve 20 is limited in a known manner by fixed lock parts 24, 25, 26, 27 and two trigger lock parts 28 and 29 which are adjustable in a known manner. The knitted lock also has a lock channel 30 formed between lock parts 31 and 32 for the same-designed sinkers 33 of the front needle bed 22 or 33.1 of the rear needle bed 23, which protrude into the sinker track 30 with a control foot 34, 34.1. The needles 21, 21.1 and the sinkers 33, 33.1 of the two needle beds 22 and 23 are each aligned with one another. Fig. 1 shows the knitted lock in a lock setting for the carriage direction indicated by an arrow 35. When the carriage is reversed, the trigger lock parts 28, 29 are adjusted in opposite directions. In addition, the blank lock parts 31, 32 are adjusted en bloc in the direction of the arrow 36 shown in FIG. 1, so that the blank lock track area 30.1 reaches the height of the trigger lock part 28. 1 also shows a thread guide 37, which feeds a thread 38 to the needles 21 and / or 21.1 of the flat knitting machine in the area of the sinker web area 30.1.

As FIG. 3 shows, the sinkers 33 have an opening for a pivot axis 39 or 39.1 (FIG. 2) common to all sinkers 33 of a needle bed 22 or 23, on which the stitch pattern projections 40 shown individually in FIG. 4 are also lined up are each arranged between the plates 33 in the needle beds 22 and 23. The circuit board 33 also has a short circular-shaped slot 41 with a closed edge, through which a hole held by the mesh forming projections 40 and wire 42 forming the knitting edge of a needle bed is passed through. The arcuate slot 41 limits the pivoting movement of the boards around the common axis 39 from a rear position shown in FIG. 3 in the direction of the arrow 43 shown in FIG. 3 to a front position which takes place in the area of the board lock track area 30.1. The arcuate slot 41 is located behind a wedge edge 44 of the board, which adjoins a stitch-receiving throat 45, which in turn is formed in the knitting direction 53 indicated by an arrow below a projection 46 of the board 33.

In Fig. 1, different lock positions II, V, VI, VII, VIII, XI are marked with dash-dotted vertical lines. 2, 5, 6, 7, 8 and 9 show the position of the sinkers 33 and 33.1 and the position of the needles 21 and 21.1 of the two needle beds 22 and 23 at these points in the production of a single-surface knitted fabric, if only that Needles 21 of the front needle bed 22 process a thread 38.
Fig. 2 shows that at the lock point II, the plates 33 of the front needle bed 22 and the plates 33.1 of the rear needle bed 23 are in their rear position, in which they do not protrude into the comb gap 50 of the flat knitting machine. An old stitch 47 hangs in the head of the needle 21.
Fig. 5 shows the position of the knitting tools at point V of the lock representation of Fig. 1, before the start of the needle drive. The boards 33 and 33.1 of both needle beds 22 and 23 are simultaneously in the direction of the arrows 43 has been pivoted by the circuit board lock curve 30 into its front position, in which its projections 46 and 46.1 lie against one another.

The comb gap 50 is thus bridged by the plates 33 and 33.1, so that when the needles 21 of the front needle bed 22 are subsequently driven out into the position shown in FIG. 6, which they assume at position VI in FIG. 1, the old stitch 47 slips into the stitch receiving throat 45 of the associated board 33 and cannot slide up out of the comb gap 50. Only the boards 33.1 are controlled in the needle bed 23. The needles 21.1 remain at rest.

Before the thread insertion begins, the sinkers 33 and 33.1 of both needle beds 22 and 23 are pivoted back into their rear position by the sinker track 30 during the transition to the sinker track section 30.1, as shown in FIG. 7 from the lock point VII and as indicated by the arrows 43 there. The comb gap 50 of the flat knitting machine is free again and the thread 38 can be inserted by the thread guide 37 (FIG. 1) unhindered into the adjustment area of the needles 21 of the front needle bed 22. The old stitch 47 hangs on the shaft of the needle 21 and bears against the wire forming the stitch wiping edge 42 of the front needle bed 22. During the subsequent withdrawal of the needles 21 up to the position shown in FIG. 8 at the lock point VIII in FIG. 1, the boards 33 and 33.1 are held in their rear position by the board lock track section 30.1. At the lock point VIII, the thread 38 gripped by the head of the needle 21 is drawn into the old stitch 47. From this position, the boards are selected rend further withdrawal of the needles 21 of the front needle bed 22 into the deepest withdrawal position shown in FIG. 9 at the point IX of the lock of FIG. 1 by the circuit board lock track 30 pivoted back to its front position, which in FIG. 9 by the arrows 43 is indicated. During this adjustment movement from the rear to the front position, the wedge edge 44 (FIG. 3) of the sinkers 33 and 33.1, over which the thread 38 of the newly formed stitch 48 comes to rest, is moved into the comb gap 50, thereby increasing the Length of the newly formed stitch 48 is carried out by auxiliary scoring of the thread 38 by means of the sinkers 33. 10 shows at this point the course of the thread 38 drawn into new stitches 48 over the needles 21 and the sinkers 33 of the needle bed 22. For reasons of clarity, the old stitches 47 are no longer shown in FIG. 10.

• Fig. 11 entspricht der Fig. 2 und damit dem Steuerzustand an der Schloßstelle II in Fig. 1.
• Fig. 12 entspricht der Fig. 5 und damit den Steuerverhält­nissen an der Schloßstelle V in Fig. 1.
• Fig. 13 entspricht der Fig. 6 und damit den Steuerverhält­nissen an der Schloßstelle VI in Fig. 1.
• Fig. 14 entspricht Fig. VII und damit den Steuerverhält­nissen an der Schloßstelle VII in Fig. 1.
• Fig. 15 entspricht Fig. 8 und damit den Steuerverhältnis­sen an der Schloßstelle VIII in Fig. 1.
• Fig. 16 entspricht Fig. 9 und damit den Steuerverhältnis­sen an der Schloßstelle X der Fig. 1.
• Fig. 17 schließlich entspricht der Fig. 10.

11 to 17 show the same as Figs. 2 and 5 to 10 in the manufacture of a two-layer knitwear when the needles 21 of the front needle bed 22 and the needles 21.1 of the rear needle bed 23 together with the sinkers 33 and 33.1 in operation are.

• 11 corresponds to FIG. 2 and thus the control state at the lock point II in FIG. 1st
• FIG. 12 corresponds to FIG. 5 and thus the control relationships at the lock point V in FIG. 1.
• Fig. 13 corresponds to Fig. 6 and thus the tax relationships at the lock point VI in Fig. 1st
• Fig. 14 corresponds to Fig. VII and thus the tax relationships at the lock point VII in Fig. 1st
• Fig. 15 corresponds to Fig. 8 and thus the tax relationships at the lock point VIII in Fig. 1st
• FIG. 16 corresponds to FIG. 9 and thus the tax relationships at the lock point X of FIG. 1.
• Finally, FIG. 17 corresponds to FIG. 10.

A detailed description of FIGS. 11 to 17 can be dispensed with. 11 and 12 show the connecting thread arch 49 between the old stitches held by the needles 21 and 21.1 of the two needle beds. 13 shows how, when the needles 21 and 21.1 are driven out, the old stitches on this connecting arch 49 are retained by the plates 33 and 33.1 in their forward position. FIG. 14 shows the inserted new thread 38, from which new stitches 51 and 52 on the two needle beds 22 and 23 are drawn in FIG. 16. Here, too, there is an additional curling for length compensation of the new stitches 51 through the curling edges 47 of the blanks 33 and 33.1 which are moved into the comb gap 50.

Claims (4)

1.Two-bed flat knitting machine with needles which are longitudinally displaceable in their needle beds and between the needles about a common longitudinal axis between a rear and a front position and which are controlled by lock parts of the carriage and which have a projection in the stitch formation area, a stitch receiving throat formed below the projection and with one Kulierkante are provided, characterized in that the Kulierkante (44) of the sinkers (33, 33.1) in the knitting direction (53) is formed after and below the thread take-up groove (45) and that the sinkers (33, 33.1) of the two needle beds (22, 23) face each other and lie in their front position with the formation of bridges spanning the comb gap (50) with their projections (46, 46.1) against each other. 2. Two-bed flat knitting machine according to claim 1, characterized in that the sinkers (33, 33.1) behind and somewhat below the wedge edge (44) have a short arcuate slot (41) which has a closed edge through which a stitch stitch edge of the concerned Needle bed (22, 23) forming wire (42) is passed. 3. Two-bed flat knitting machine according to claim 1 or 2, characterized in that the lock parts (31, 32) controlling the sinkers (33, 33.1) relative to the lock parts (24 - 29) controlling the needles (21, 21.1) in the direction of the slide movement ( 35) are arranged in the carriage in an adjustable manner. 4. A method for producing a knitted fabric on a two-bed flat knitting machine according to one of claims 1 to 3, characterized by the following method steps: a) guiding the needles (21, 21.1) in the withdrawn position and holding the sinkers (33, 33.1) in their rear position; b) pivoting of the sinkers (33, 33.1) into their front, the comb gap (50) bridging position before the expulsion movement of the needles (21, 21.1) begins, and holding the sinkers (33, 33.1) in the front position in the Old meshes (47, 49) held by the sinker (45) during the entire expulsion movement of the needles (21, 21.1); c) pivoting the sinkers (33, 33.1) back into their rear position before the thread (38) is inserted and the withdrawal movement of the needles (21, 21.1) begins; d) Holding the sinkers (33, 33.1) in the rear position until the heads of the needles (21, 21.1) holding the inserted thread (38) pass the height of the wedge edge (44) of the sinkers (33, 33.1) during the withdrawal movement have and are moved through the old meshes (47); e) pivoting of the sinkers (33, 33.1) with the thread (38) lying against its wedge edge (44) in its forward position during the remaining withdrawal movement of the needles (21, 21.1).

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