GB2208235A

GB2208235A - Shogging mechanism of a control drum of a circular knitting machine

Info

Publication number: GB2208235A
Application number: GB8816720A
Authority: GB
Inventors: Jan Kabatek; Jan Trnka; Jan Fikrle
Original assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Current assignee: Elitex Zavody Textilniho; Elitex Koncern Textilniho Strojirenstvi
Priority date: 1987-07-15
Filing date: 1988-07-14
Publication date: 1989-03-15
Anticipated expiration: 2008-07-14
Also published as: IT8821350A0; CS263322B1; IT1226257B; CS538187A1; GB8816720D0; GB2208235B; DE3821842A1

Description

1 - "SHOGGING MECHANISM OF A CONTROL DRUM OF A CIRCULAR KNITTING MACHINE"

DESCRIPTION:

Q 9 -? 0;W fj 'S The invention relates to a shogging mechanism of a control drum of a circular knitting machine for the production of socks and the like goods.

It is known that in small diameter knitting machines for the production of socks and hosiery goods shogging of the control drum or control drums in individual knitting feeds is performed by lever mechanisms with two cams and assigned shogging levers and pawls, as known for example from the Czechoslovak Author's certificate No 185,534. Pawls or shogging levers are controlled by a switching device which brings the pawls into operating position alternately according to the program of the timing device of the machine.

The disadvantage of said devices is a too large built-up space, heavily dimensioned parts with consequently large inertia masses influencing the shog overrun.

The aim of the invention is to eliminate the above mentioned disadvantages. According to the invention there is provided a shogging mechanism of a control drum of a circular knitting machine for the production of socks and the 'Like goods, comprising two pawls and a ratchet wheel, wherein the pawls are kinematically coupled with one shogging cam.

The advantage is the fact that the solution enables the performance of two kinds of shogging of the control drum with a relatively simple, spacesaving mechanism during one revolution of the cam rotating synchronously with the needle cylinder.

An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:

Fig. 1 illustrates the arrangement of a needle cylinder and a control drum and a shogging mechanism; and Fig. 2 illustrates a section along A-A from Fig. 1.

A known single cylinder circular knitting machine for the production of hosiery goods is provided with a needle cylinder 1 which is fixedly mounted on a tube 2. Tube 2 is 1 1 located in a bearing 3 of an upper plate 4 of the machine and further in a not shown lower plate of the machine. In said upper plate 4 there is rotatably mounted a control drum 5, the upper part 51 of which is arranged above the upper plate 4 and the lower part 52 of which is under the upper plate 4.

The actual shogging mechanism consists of the following parts. A cam 6 of main and secondary shogging is arranged fixedly on the tube 2 under a body 7 of the bearing fixed to the upper plate 4 of the machine. Main shogging of the control drum is taken from the cam 6 through a rod 8 (Fig. 2) located also in the body 7. Rod 8 pushes a shogging lever 9 located swingably on a pin 53 of the control drum 5. On the shogging lever 9 there is swingably mounted a pawl 10 engaging with a ratchet wheel 11 of the control drum 5. Under the ratchet wheel 11 there is a fixedly mounted disk-like shaped plate 12 with control teeth 120 of the secondary shogging.

The secondary shogging mechanism contains a releasing pawl 13 located swingably on a pin 130 in the body 7. Releasing pawl 13 is by its one end assigned to the disk-like shaped plate 12 and by its other end it engages the tooth 140 of a segment 14. Segment 14 is fixedly mounted by means of a screw 141 on a slide 15 of arcuate shape. The slide 15 is slidably mounted on the arc of the bed of the body 7, while it moves around the axis of the cam 6 and it is secured by packing pieces 16 connected with the body 7 by means of screws 160. Releasing pawl 13 and slide 15 are springloaded by tension springs 17 and 18, the one ends of which are fixed to them. The other end of the spring 17 is fixed to the body 7 and the other end of the spring 18 is fixed to the packing piece 16. one end of a sensing lever 19 bears by its follower onto the slide 15 and the other end of the sensing lever bears against the cam 6. Sensing lever 19 is rotatably mounted on a pin 71 of the body 7. On the other end of the slide 15 there is swingably mounted a pawl 20 engaging the ratchet wheel 11.

Secondary shogging is thus ensured by kinematic coupling of the pawl 20, slide 15 and sensing lever 19 to the cam 6. The already mentioned rod 8, which together with the shogging lever 9 forms the second kinematic coupling to the pawl 10 of 1. 1 1 1 3 - main shogging of the control drum 5, bears offset by 180' of the cam 6 circumference. Electromagnet 21 being controlled by a not shown control microcomputer of the machine is assigned to the pawl 10.

The operation of the above described device is as follows. By a command from the microcomputer the armature of the electromagnet 21 releases the shogging lever 9, which due to the pull of the spring 91 presses onto the rod 8 which follows the surface of the cam 6. Cam 6 moves thus the rod 8, rod 8 moves the shogging lever 9 and the pawl 10 engages the ratchet wheel 11 which rotates and together with it also the control drum 5. Having performed the necessary number of shogs, the electromagnet 21, or the microcomputer blocks the shogging lever 9 in the front position.

Secondary shogging of the control drum 5 is controlled according to the dislocation of the teeth 120 of the disk-like shaped plate. The tooth 120 swings the releasing pawl in the direction S and the releasing pawl gets out of engagement with the tooth 140 on the segment 14, thus the slide 15 is released and by the pull of the spring 18 it is forced onto the sensing lever 19. Sensing lever 19 then moves the slide 15 due to the rotation of the cam 6, as illustrated by a full and dashed line and its pawl shogs the ratchet wheel 11 and thus also shogs the control drum 5. As soon as the tooth 120 stops acting on the releasing pawl 13 the secondary shogging is automatically blocked. Main shogging is thus performed on one half of the cam 6 or of the needle cylinder and the secondary shogging on the other half, which results from kinematic coupling to the cam 6. Further, both shogs are synchronized so that the secondary shogging can be switched on only after the main shogging, because the disk-like shaped plate 12 must be in motion to enable the release of the slide 15.

The advantage of the solution is that the control microcomputer by its command in fact controls both shogs and it would be very difficult to synchronize both shogs should they not be kinematically coupled.

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Claims

CLAIMS:

1. A shogging mechanism of a control drum of a circular knitting machine for the production of socks and the like goods, comprising two pawls and a ratchet wheel, wherein the pawls are kinematically coupled with one shogging cam.

2. A shogging mechanism according to claim 1, wherein the ends of kinematic couplings with the shogging cam are by 180' offset.

3. A shogging mechanism according to claim 2, wherein one pawl is swingably located on a slide of an arcuate shape, onto which bears a sensing lever of the shogging cam opposite to the sensing rod of the second kinematic coupling of the second pawl while the slide is located coaxially with the shogging cam.

4. A shogging mechanism according to claim 3, wherein to the slide is assigned a releasing pawl, the other end of which is assigned to a disklike shaped plate mounted fixedly on the control drum and beside a shogging ratchet wheel of said control drum.

5. A shogging mechanism of a control drum of a circular knitting machine for the production of socks and the like goods, substantially as hereinbefore described with reference to the accompanying drawings.

Published 1988 a, --c Patcn: Office. State House- 66 li,.-- Hc!'tcrr_. Lond-on 47F F-arther ccp:e- YnK. be o"ota'-net frcn' 71-. Patent O.-E Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. Primed by Multiplex technicrues ltd. St Mary Crky. Kent Cc,-. 187