JPH0577776B2 - - Google Patents

Abstract

The guide system for a thread entering a stocking knitting machine having a cylindrical array of needles which rotates constantly and a supplementary thread guide which can skip over selected groups of needles to form the heel of the stocking is complemented by a supplementary concentric array of guide plates backed by an annular cam above the level of the plates alongside the tops of the needles but below the level of the cap through which the filament enters coaxially. The cam is shaped to induce a centripetal movement of the plates to be followed by a centrifugal recoil at appropriate intervals controlled by interruption of the motions of a pair of concentric toothed racks having an intermediate pinion and pins which can be intercepted by deployment of radial check rods. Slows the main array of needles to rotate continuously while causing the amount of thread deployed to be varied to suit the shape of a heel or other modification of the stacking profile so that the circumferential threads do not exhibit excessive residual tension.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a yarn feeding device in a circular knitting machine for socks for forming the heel of socks.

The needle cylinder has the function of making a continuous rotational movement in one direction, and the thread path periodically passes over the needles arranged along an arc to form the heel to move the thread in front of the rising needle. Circular knitting machines for shoe bottoms are known.

In this known circular knitting machine for socks, the heel of the sock is formed by a continuous movement of the needle cylinder in one direction, by means of a yarn path that moves coaxially with the needle cylinder. This yarn path feeds the yarn to a needle that follows the needle cylinder, stops before the stitch formation position, passes in front of the yarn, and then passes over the rising needle with an angular velocity that exceeds the angular velocity of the needle cylinder. , the yarn is placed in front of the needle, the yarn is knitted by a subsequent descent at the subsequent stitch forming position, and finally begins to follow the needle cylinder again.

In this knitting machine, the yarn supplied by the yarn path is
Since it is approximately the same length as the arc of the cylinder, it does not have a length to accommodate the development of the stitch that it is trying to form, so once the stitch is formed, excessive tension is placed on the yarn and the stitch becomes very It has the disadvantage of being tight.

The main aim of the invention is to eliminate this drawback.

By accumulating yarn longer than the length of the rotating arc of the fed needles, the present invention allows yarn to be delivered to a hosiery knitting machine with continuous rotation of the needle cylinder without creating tension in the yarn during stitch formation. Solve the above problems when supplying.

More particularly, the yarn feeding device of a hosiery knitting machine according to the invention is characterized in that the auxiliary platen of several conventional platens is movable radially forward and backward toward the center and circumference of the needle cylinder;
A cam structure is provided to control the movement of the platen. Advantageously, this auxiliary platen is arranged above a ring of conventional platens arranged with control projections projecting downwards.
This cam structure, with respect to the ring of the platen cylinder, takes the help of two coaxial sector gears and a transmission pinion (idler) and by the intervention of a stopper bar that stops both sector gears in order to stop and pass the cam. , activated.

The advantage provided by the invention is essentially that the threads utilized to form the stitches forming each heel chain are not under tension. As a result, the operation of the circular hosiery knitting machine with continuous rotation of the cylinder becomes more regular, even during longer periods of operation. The yarn feeding device according to the invention can also be applied to existing machines.

The invention will now be described in more detail with reference to the accompanying drawings, which represent one embodiment of the invention.

1-3, 51 designates a needle cylinder and 53 a ring that engages the needle cylinder 51 around its upper edge to form a radial housing for a conventional platen 55. shows.

In FIG. 2, ring 53 of platen 55
extends at its lower portion to form a radial groove with respect to the platen. Platen 5
5 has a downwardly projecting protrusion 55A for cooperating with a lower ring structure 57 corresponding to a so-called conventional platen housing. This arrangement is necessary because an auxiliary set of platens 59 for retrieving the pre-prepared thread in an area around the needle cylinder 51 (which needles form the protrusion 59A) is attached to the ring 53. This is because it is provided at the top of the The yarn recovery platen 59 has an upwardly protruding control protrusion 59A for cooperating with a cam structure 61 constituting a housing of the yarn recovery platen 59 extending in an arc shape.

This cam structure 61 is connected to the ring 5 of the platen 55.
It is clutched by friction against 3 and rotates,
The ring 53 is supported so as to move alternately. The cam structure 61 is integrated with a sector gear 63 having external teeth. A second sector gear 65 with internal teeth is provided in the housing formed by the ring 53 of the platen 55, is integral with the needle cylinder 51 and is rotatable relative to the ring 53. , gripped by friction. Two sector gears 6 with an autorotation function
Free-fitting pinion 67 that engages simultaneously with 3 and 65
is attached to the ring 53 of the platen 55. The sector gear 63 is provided with a pin 71 which cooperates with a stop bar 73 which acts to interfere with or avoid it. Similarly, the sector gear 65 is provided with a pin 75 which is
It cooperates with a stopper rod 77 that operates to interfere with or avoid it (FIG. 3). The stopper rods 73 and 77 can be moved to reach two positions.
It can be controlled radially and/or circumferentially. As long as neither of the stopper rods 73 and 77 interferes with the pins 71 and 75, both the sector gears 63 and 65
rotates along a frictionally engaged ring 53. When the stopper rod 77 protrudes to interfere with the pin 75, the sector gear 65 is stopped.
At this moment, the pinion 67, continuing its movement with the ring 53, begins to roll along the teeth of the sector gear 65, thus advancing the sector gear 63 with an angular velocity approximately twice the angular velocity of the needle cylinder 51. The cam profile of the cam structure 61 thereby acts on the platen 59 to cause a radial movement towards the center of the needle cylinder 51. Stopper bar 77
When retracted, relative movement between ring 53, sector gear 65 and sector gear 63 and cam structure 61 is prevented and platen 59 tends to remain extended. Stopper bar 73
When the protrusion toward the center of the pin 71 acts on the pin 71,
The sector gear 63 stops and therefore the cam 61 also stops, but the ring 53 continues to rotate. As a result, platen 59 passes through cam structure 61 at this point, which is stopped and returned outwardly with radial movement outwardly from the center.

Further, due to the reverse rotation of the pinion 67, the sector gear 65 rapidly moves forward. As soon as the holding action of the stopper rod 73 on the pin 71 ceases, the sector gear 65 relative to the ring 53 stops as shown in FIG.
and 63 are restored and these elements 53, 65, 63 begin to rotate together with the needle cylinder 51 again. The centripetal radial movement of platen 59 occurs progressively as a result of the profile of cam structure 61 and accelerates the movement of needle cylinder 51. It should also be noted that centrifugal radial movement of platen 59 also occurs gradually, but as a result of its contour acting on protrusion 59A of platen 59, and occurs in the opposite direction during rest of cam structure 61. That is,
Initially, in the direction of rotation of the needle cylinder 51, starting from the rear platen in a section of the platen 59, and in the second phase also starting from the front platen.
Their centripetal movement of the platen 59 draws more thread than would be possible based on the movement of the thread path 98 when the thread path 98 is forced to pass rapidly through the needle cylinder 51. The platen 59 moves forward and the thread F
is made to move as shown in FIG. 5, and with respect to the last Ax of knitting by taking in the yarn, a length of yarn exceeding the length of yarn corresponding to the arc of the needle cylinder 51 is pulled out.

When the platen 59 slides relative to the sector gear 63 in the direction of rotation of the needle cylinder 51, the platen 59 moves back in the centrifugal direction and thus also delivers the yarn so that it continues to stitch without tension as the needle descends. can be formed.

The above-described device makes it possible to accelerate and stop moving at a speed equal to the speed of the needle cylinder by means of a power transmission device operating the thread path 98. To achieve this, a structure 91 is combined with a structure 91 supporting a plate 92, a small plate-like member rotating coaxially and above the needle cylinder 51 and actuated by a pair of bevel gears 93.
A device as shown in FIGS. 1 and 2 is provided. Inside the shaft of the plate 92 there is provided a hollow shaft 97 which rotates and controls a thread path 98 which holds the thread F from a forward position below the plate 92 and which feeds the needle A and It can be moved to a centripetally retracted position close to the opening 100 for gas aspiration, excluding the needle.

One common device controls the radial movement of the thread path 98 at the beginning and end of the heel formation of the sock. The rotation of the shaft 97, which has an axial void through which the yarn F passes, is controlled by gears 99-101. Among these, the gear 101 is the cogwheel 105
It is integrated with a small pinion 103 that meshes with the pinion. The gear 105 cooperates with a pawl 109 (see FIG. 1) mounted by a pivot 110 on a lever 112 which is coaxial with the assembly 105-107, suitably controlled by a handbrake 114. It is operated in a unidirectional movement by means of a serrated gear 107.

The lever 112 is a cam 12 whose details are shown in FIG.
With contact roller 120 actuated by tie rods 116-118. This cam 122 has a sector area A in which the thread path 98 is closed, a sector area B in which the thread path 98 moves at a speed equal to the speed of the needle cylinder, and a sector area B in which the thread path 98 moves at a speed approximately three times the speed of the needle cylinder 51. and a sector D in which the thread path 98 moves at a speed equal to the speed of the cylinder 51. roller 120
All these movements obtained by the operation of the cam 122 in conjunction with the cam 122 are augmented by the power transmission described above. The operation of the above device is shown in FIGS. 4 and 5. In FIG. 4, PA indicates the position in which the yarn channel 98 remains closed until all active needles A have formed a stitch in position PB. The thread path 98 moves from point PA to point PC while all active needles A are being raised. The thread path 98 connects the cylinder 51 from position PC to position PE.
The cylinder 51 moves forward at a speed three times that of the cylinder 51.
After moving to position PA with a speed equal to the speed of
Stop there. At position PD, a stitch is formed by the yarn F, which is already draped over the needle A, due to the rapid movement of the yarn path 98.

All these operations occur each time the needle cylinder 51 rotates.

The needle A, designed to work for the formation of the heel of a sock, is gradually withdrawn and fed, with successive rotations of the cylinder 51 in the same direction and with alternating rows, at the end of the arc of the working needle. , a conventional heel can be formed.

In FIG. 5, the needle cylinder 51 is moved at three times the speed.
The position of the yarn path 98 is shown when a stitch is to be formed by the yarn F passed through and placed by the yarn path 98. FIG. 5 shows needle A starting from needle Ax and raised in an arc to form the heel. From this needle Ax, the thread F is placed in front of the needle A as the thread path 98 passes. At the same time, sector gear 63 and thus cam structure 61 are operated as previously described, causing platen 59 to be moved centripetally. During advancement of the needle cylinder 51 following movement past the cam structure 61 and
1 is stopped, the platen 59 is gradually moved centripetally, ie, retracted to provide enough yarn F to form a stitch at the stitch forming position of the needle. In FIG. 5, 59x indicates the platen still advancing in the centripetal direction, and 59z indicates the platen retracting in the centrifugal direction.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the operating section of the thread guide. FIG. 2 is a vertical sectional view of the entire device according to the invention.
FIG. 3 is a plan view of a portion of the apparatus according to the invention. FIGS. 4 and 5 are operational diagrams. FIG. 6 is a detailed diagram showing the operation of the thread guide. 51...Needle cylinder, 53...Ring, 55,
59...Platen, 61...Cam structure, 63,6
5...Sector gear, 67...Pinion, 71,7
5...Pin, 73, 77...Stopper bar, 98...
...Thread path, 112...Lever, 116, 118...
Tie rod, 120...Contact roller.

Claims (1)

[Claims] 1. (a) A needle cylinder 51 that rotates in one direction; (b) A conventional platen 55; (c) A predetermined needle A of a plurality of needles arranged along an arc. The yarn path 98 passes periodically at high speed to form the heel of the sock and lowers the yarn F in front of a selected needle to create said heel stitch.
and (d) a plurality of auxiliary platens 59 arranged along an arc concentric with said needle cylinder 51 , said platens 59 being arranged below said plate 92 . cam structure 6 in synchronization with said thread path 98 placed in
The above-mentioned yarn feeding device for feeding yarn during heel formation in a hosiery knitting machine, characterized in that it is moved in a radial direction towards the center or circumference of the needle cylinder 51 by the needle cylinder 51. 2. Yarn feeding device according to claim 1, characterized in that the auxiliary platen 59 is arranged above the ring 53 of the conventional platen 55, which is provided with a downwardly protruding protrusion 55A. . 3 (a) a needle cylinder 51 that rotates in one direction; (b) a conventional platen 55; and (c) a needle A that rotates periodically at high speed over a predetermined needle A among a plurality of needles arranged along an arc. Yarn path 98 passing through to form the heel of the sock and lowering yarn F in front of the selected needle to create said heel stitch
(d) a plurality of auxiliary platens 59 arranged along an arc concentric with said needle cylinder 51, said platens 59 being arranged below said plate 92; The cam structure 6 is synchronized with the placed thread path 98.
1 toward the center or circumference of the needle cylinder 51, and the cam structure 61 is moved by two sector gears 63, 65 coaxial with the pins 71, 75 and the loose pinion 67. and controlling the stopping and overlapping of the cam structure 61 by the intervention of stopper rods 73 and 77 that stop the sector gears 63 and 65, respectively, and are actuated against the ring 53 of the platen 55; The above-mentioned yarn feeding device for feeding yarn during heel formation in a socks knitting machine, characterized by: 4. Yarn supply according to claim 1, characterized in that the yarn path 98 is hollow and the yarn F is fed through a hole in a shaft 97 that controls the rotational movement of the yarn path 98. Device.