GB2166461A

GB2166461A - Device for cutting plush loops

Info

Publication number: GB2166461A
Application number: GB08526829A
Authority: GB
Inventors: Vaclav Krepinsky; Miroslav Krepinsky; Karel Sodomka; Bohumil Kosik
Original assignee: VYZK VYVOJOVY USTAV
Current assignee: VYZK VYVOJOVY USTAV
Priority date: 1984-11-01
Filing date: 1985-10-31
Publication date: 1986-05-08
Also published as: IT1186347B; ES549069A0; ES8701256A1; GB8526829D0; GB2166461B; JPS61167066A; DE3537908A1; CS243267B1; CS829284A1; IT8522649A0

Abstract

A device for cutting plush loops comprises a pair of co-operating plush sinkers (3,4), suitably controlled by a cam system. Each sinker has, preferably on its upper side, a well (8) with sharp side edges (9). The wells (8) move relative one another to cut the plush thread of a loop as the edges (9) overlap. The loop (18) is preferably drawn into the wells (8) by means of a knitting needle (11). <IMAGE>

Description

SPECIFICATION Device for cutting plush loops of double bound plush The present invention relates to a device for cutting plush loops of double bound plush.

Cut double bound plush is manufactured in circular knitting machines of the rib type with a cylindrical and a dial plate bed, or in single bed circular knitting machines provided with an auxiliary sinker bar. In circular rib knitting machines, the cutting of the plush loops is perfomed by working out one course of double bound plush, when the plush loops are formed over shanks of stoppers, which are slipped out in a direction from the centre of the circular knitting machine by means of cams. plush loops formed by the motion of the stoppers are cut by sharp blades situated on the upper sides of the shanks of the stoppers. However, the plush loops are distorted on cutting, so that their length is different.To avoid this known circular knitting machines are provided with pressure rollers, which bear against a circumferential surface of a dial plate bed, so as to stabilize the separate plush loops.

The disadvantage of this known device is a relatively high purchase price, and low reliability.

When manufacturing a cut double bound plush by means of a single bed circular knitting machine, this machine is provided with an auxiliary sinker bar, in which are displaceably mounted plush sinkers, which are vertically movable relative to the operative motion of the knitting needles. The plush sinkers are provided with a plush catch intended for pulling out the plush loops to a predetermined length. The knitting needles, as well as the plush loops are controlled by a cam system.

The plush loops thus formed are pulled out from a needle row to the side of the circumferential edges of the auxiliary sinker bar grooves. Upon shaping, the tops of the separate plush loops are cut from their two arms about the circumferential edges of the auxiliary sinker bar grooves on drawing in the plush loop tops into the grooves by means of the plush sinkers. The plush catch of each sinker is provided for that purpose on its upper side with a hook shaped well having sharp side edges, into which the plush loop is engaged.

The disadvantage of this arrangement is that there is a considerable wastage formed by the plush loop tops. This waste increases dust in the machine which requires constant sucking out which wastes power.

A cutter is also known which is formed in each groove of the auxiliary sinker bar by a pair of sinkers arranged therein, and wherein one plush sinker is movable and its plush catch is provided with a well, an edge of which is situated nearer the centre of the circular knitting machine. This edge is provided with a side blade. The other plush sinker being the cutting sinker is stationary and is provided on its front edge with another side blade. When the blade of the cutting sinker is passed by the blade of the plush sinker with a plush loop laid thereon, the plush loop is cut without waste. However, the disadvantage of that arrangement consists in low reliability of cutting all plush loops due to blunting of the blades, and particularly by a possible gap between the two sinkers, whereupon the plush loop is only clamped without being cut.

For cutting plush loops, a cutter was also designed, which consists of a cutting sinker of reversed 'U' shape, mounted displaceably inside the groove of the auxiliary sinker bar, and a plush sinker mounted displaceably inside the cutting sinker. The plush sinker is provided on its upper side with a hook shaped well with sharp side edges, into which the plush loop is engaged. The cutting sinker is provided on both its webs with a sharp chamfered double front part. The two sinkers are controlled by the cam system. When the top of the plush loop is taken by the plush sinker into the cutting sinker, the latter moves in the reverse direction and cuts the top of the plush loop by means of its chamfered double front part co-operating with the sharp side edges of the plush sinker.The disadvantage consists again in considerable wastage which requires to be removed and increases dust in the machine.

The above disadvantages and shortcomings are mitigated by a device for cutting double bound plush loops according to the present invention, comprising a pair of controlled cooperating plush sinkers, each of which are provided preferably on an upper part with a well having sharp side edges the wells acting together to cut the plush loops. The sinkers are preferably cam controlled.

It is advantageous that the pair of plush sinkers is mounted in one guiding groove of an auxiliary sinker bar or that the pair of plush sinkers is mounted in one radial groove of a dial plate bed.

It is also possible that one of the co-operating piush sinkers is mounted inside a guiding groove of an auxiliary sinker bed whilst the other is mounted in a radial groove of a dial plate bed.

It is also advantageous if one of the pair of plush sinkers is provided adjacent the well with a laterally arranged taking up projection, which has its end in sliding contact with the neighbouring plush sinker of an adjacent second pair.

The advantage of the cutting device of the present invention is that it substantially increases the reliability of cutting all plush loops without any distortion thereof. A further advantage is a reduction of waste for about 20 to 25 per cent of the mass of the material, as it is formed only upon levelling the surface of the formed plush. In comparison with other known arrangements, the design according to the present invention reduces dust as well as cost.

Devices for cutting plush loops of double bound plush according to the invention will now be described by way of example with reference to the accompanying drawings, in which Figures 1 to 4 are diagrammatical views of part of an auxiliary sinker bed according to one embodiment of the invention with a pair of plush sinkers in several separate phases of maufacturing plush in co-operation with a knitting needle, Figure 5 is a partial view of an auxiliary sinker bar with one of the plush sinkers of each pair similar to those of Figs. 1 to 4, provided with a taking up projection in plan view, Figure 6 is a diagrammatical plan view of a part of a circular knitting machine according to a second embodiment of the invention with a pair of plush sinkers and a knitting needle in sinking position, and Figure 7 is a diagrammatical view of a part of an auxiliary sinker bar and a part of a dial plate bed with overlapping plush sinkers according to a third embodiment of the invention.

An auxiliary sinker bed 1 with a system of guiding grooves 2 is provided in each thereof with a pair of plush sinkers 3,4 of completely congruent shape, except the butts 5,6 which are arranged on the plush sinkers 3,4 in relation with a cam system (not represented).

Each plush sinker 3,4 is provided, according to Figs. 1 to 4 with a catch 7 in which a well 8 with sharp side edges 9 is provided on the upper side, which is arranged to trap plush thread 10 laid into knitting needle 11, which is slidably mounted, together with remaining knitting needles (not represented) in a cylindrical needle bed (not represented). Below catch 7, each plush sinker 3,4 is provided with a rounded-off projection 12, over which plush fabric 13 is withdrawn.

In the initial phase, by the action of cams (not shown) on the butts 5,6, the pair of plush sinkers 3 and 4 moves in a direction towards the centre of the circular knitting machine (see Fig. 1), as far as it penetrates with its wells 8 between the knitting needles 11.

Before finishing that phase, ground thread 14 is laid, by means of a guide (not shown) on a latch 15 of knitting needle 11, which begins to move downwards and traps in its beard the plush thread 10 fed by a guide (not shown). The plush thread is thereby drawn into the wells 8 of the pair of plush sinkers 3 and 4 (see Fig.2). The old loop 16 closes, upon further movement, the latch 15 of knitting needle 11, below which is also entrapped the ground thread 14. The knitting needle 11 then moves into its lowermost position, and a new loop 17 is gradually formed from plush thread 10 and ground thread 14, over which the old loop 16 is knocked over from the beard of knitting needle 11 (see Fig. 3).In that phase, it is possible to cut the plush loop 18, which is entrapped in the wells 8 of plush sinkers 3 and 4, by means of the arrangement of the cam system by mutual relative motion of both plush sinkers 3 and 4. Thus, the sharp side edges 9 of the two plush sinkers 3 and 4 become overlapped which cuts the plush loop 18. During cutting, both plush sinkers 3 and 4 are partially embraced by the plush loop 18, and thus, from the point of cutting, the plush thread 10 is tensioned at both sides, and safely cut in the middle part of the plush loop 18, without the danger of its being clamped between the sharp side edges 9 of wells 8 of the two plush sinkers 3 and 4.

From the bottom dead centre, the knitting needle 11 is lifted into the closing position.

The new loop 17 is displaced over the latch 15 of the knitting needle 11 on to its shank.

In that phase, it is also possible to perform the cutting of the plush loop 18 in the same manner as specified in the phase according to Fig. 3.

As shown in Fig. 5, one plush sinker 4 of each pair of plush sinkers 3,4 is provided near well 8 with a laterally arranged taking up projection 19 which has its end in sliding contact with the neighbouring plush sinker 3, and is mounted displaceably in the neighbouring guiding groove 2. The taking up projections 19 perform a closer contact of the sharp side edges 9 of the co-operating plush sinkers 3 and 4 during cutting, so that each plush loop 18 is more reliably cut.

The plush sinkers 3 and 4 can be also mounted displaceably in the radial grooves 20 in a dial plate bed 21 (see Fig. 6), each pair of plush sinkers 3 and 4 being again provided with wells 8 which are coincident with those of the plush sinkers 3 and 4 as shown in Figs. 1,2,3 and 4. Each of the plush sinkers 3,4 in every pair in the dial plate bed 21 can be also provided by a taking up projection (not shown) which is coincident with the taking up projection 19 as shown in Fig. 5.

The co-operating pair of plush sinkers 3,4 can also, as may be seen in Fig. 7, be separated, one plush sinker 3 being displaceably mounted in a guiding groove 2 of auxiliary sinker bed 1, while the other plush sinker 4 is mounted in a radial groove 20 of dial plate bed 21. Also in that embodiment, the cutting of the plush loop 18 is performed congruently with the embodiments represented in Figs. 1, 2, 3, 4 and 6, either upon movement of one of the plush sinkers 3 or 4 or upon their mutual relative movement.

The cutter according to the present invention can be used for wasteless cutting of plush loops of double bound plush.

Claims

1. A device for cutting plush loops of double bound plush comprising a pair of controlled co-operating plush sinkers each provided with a well with sharp side edges, the wells acting together to cut the plush loops.

2. A device as claimed in Claim 1 wherein the wells are formed on an upper edge of each sinker.

3. A device as claimed in Claim 1 or 2 wherein the sinkers are arranged to be controlled by a cam system.

4. A device as claimed in any one of Claims 1 to 3, wherein the pair of plush sinkers is mounted in one guiding groove of an auxiliary sinker bed.

5. A device as claimed in any one of Claims 1 to 3, wherein the pair of plush sinkers is mounted in one radial groove of a dial plate bed.

6. A device as claimed in any one of Claims 1 to 3, wherein one of the co-operating plush sinkers is mounted in a guiding groove of an auxiliary sinker bed, while the other one of the co-operating plush sinkers is mounted in a radial groove of a dial plate bed.

7. A device as claimed in any one of claims 1 to 6, wherein one of the pair of plush sinkers is provided adjacent the well with a laterally arranged taking up projection, which has its end in sliding contact with the neighbouring plush sinker of an adjacent pair.

8. A device for cutting plush loops of double bound plush substantially as described with reference to Figures 1 to 4 of the accompanying drawings.

9. A device for cutting plush loops of double bound plush substantially as described with reference to Figure 5 of the accompanying drawings.

10. A device for cutting plush loops of double bound plush substantially as described with reference to Figure 6 of the accompanying drawings.

11. A device for cutting plush loops of double bound plush substantially as described with reference to Figure 7 of the accompanying drawings.