DE1121264B - Process and circular knitting machine for circular knitting of partially reinforced hosiery - Google Patents

Description

Process and circular knitting machine for circular knitting of partially reinforced Hosiery The invention relates to an improvement in the method and the Circular knitting machine for circular knitting of partially reinforced hosiery, in particular of fine stockings with reinforced heel and toe and possibly reinforced Sole as described in the main patent application Sch 25014 VII a / 25a (German Auslegeschrift 1 114271).

According to the method according to the main patent application, the reinforcing thread, which initially passes through the reinforced part of the hosiery together with the basic thread a lock system is knitted, not cut off at the edge of the reinforced part, but by another lock system, which is relative to the first lock system moved, knitted back alone to the starting edge of the reinforcement. The needle cylinder runs around, and the lock system for the base and reinforcement thread is stationary, whereas the lock system for the reinforcement thread is uniform and constant Speed, which corresponds to at least twice the cylinder speed, in the same Direction of rotation as the cylinder revolves.

If the speed of the lock system for the reinforcement thread corresponds to twice the cylinder speed, then when working according to the method described in the main patent application, the width of the reinforced part of the goods can at most be extended over half the cylinder circumference. This is also only theoretically possible, since when the lock system for the reinforcement thread meets the lock system for the base and reinforcement thread, both lock systems must never act on the same needles at the same time in order to prevent damage to the needles and knitting errors. The size of the cylinder sector on which the gain can be worked results from the following relationship: Reinforcement width = cylinder circumference X cylinder speed - lock width. Lock system speed It can be seen from this that when the lock system speed increases, the gain width becomes smaller, that is to say, for example, at three times the speed, it is less than a third of the cylinder circumference. However, since the necessary cam width takes up a considerable proportion of the cylinder circumference in the case of small cylinder diameters, such as those used in circular stocking machines, the reinforcement width achieved with the device described is not always sufficient.

According to the invention there is a substantial improvement in the process achieved according to the main patent application in that to enlarge the reinforcement width the lock system processing the reinforcement thread alone and the associated sinker lock rotate in the same direction with more than twice the cylinder speed and together periodically only during one of its revolutions per cylinder revolution for backward entangling of the reinforcement thread are switched on alone, with the reinforcement thread guide take along. A circular knitting machine is used to carry out this method according to the invention with to switch the revolving lock system on and off and to operate a the upper clutch controlling the reinforcement thread guide Switch rings, which can be rotated over a small angle and coaxial to the Cylinders are slidable and have sloping surfaces on their underside on corresponding Sloping surfaces on the top of lower, stationary and coaxially arranged switching rings to the cylinder prop up.

In circular knitting machines with two lock systems rotating in opposite directions, lifting rings with lugs protruding from their surface are known which are arranged below the needles in such a way that they can be rotated and lifted. This turning and lifting of the lifting rings by switching rings with rollers, which are supported on inclined surfaces, is used here, however, to select individual needle groups in order to reduce or increase the width of the goods.

In the circular knitting machine according to the invention, the sinker lock belonging to the revolving lock system is controlled by a ring which is stationary and coaxial with the cylinder and has two control tongues that can be pivoted out and in independently of one another. Because the revolving lock system revolves at more than twice the cylinder speed, the two lock systems meet several times per cylinder revolution, but since the revolving lock system is only switched on during one revolution per cylinder revolution, the needles are used to knit the reinforced part only one meeting of the systems should be observed, in which the needles for knitting the reinforced part must not be operated simultaneously by both lock systems. According to the method according to the invention, the following relationship results between the speed of the cam system for the reinforcement thread, the cylinder speed and the reinforcement width: Reinforcement width = cylinder circumference X 1 --- cylinder- -d -speed-hl- l-lock width. Lock system speed It follows that when the lock system speed is increased, the gain width can be increased and z. B. at four times the lock system speed compared to the cylinder speed, the gain width can be expanded to three quarters of the cylinder circumference minus the lock width. In practice, however, it has proven to be beneficial to let the lock system for the reinforcement thread rotate at three times the cylinder speed. In the following, therefore, an embodiment in which the lock system for the reinforcement thread rotates at three times the cylinder speed is described in more detail with reference to drawings.

Fig. 1 shows the upper part of a circular knitting machine in longitudinal section according to the invention; Fig. 2 shows the lock system for the reinforcement thread in an enlarged Representation in section; Figure 3 is a schematic plan view of the sinker lock while switching off the revolving sinker lock; Fig.4 is an enlarged Illustration from FIG. 3 with the sinker lock for the reinforcement thread switched off; FIG. 5 shows a representation similar to that in FIG. 3, but during switching on the revolving sinker lock for the sole re-knitting of the reinforcement thread; FIG. 6 shows a perspective view of the process according to FIG. 5 in detail; 7 shows a perspective view of the control device for the sinker lock; 8 shows in section the drive of the thread guide for the reinforcement thread in enlarged view.

In Fig. 1, the overall arrangement of the circular knitting machine is shown in section, as it is already described in the main patent application. The cylinder is composed of the needle cylinder Z for the needles 2 and a sub-cylinder Z4 for the sample slide 4 and sits on the shaft 5 of the shaft wheel 6 , by which it is driven. The shaft wheel 6 has a second ring gear 6 'which meshes with the gear wheel 7 for driving the shaft 8 . The gear wheel 7 is rotatably seated on the shaft 8 with a liner 81 and is coupled to the shaft 8 via a coupling sleeve 80. The shaft 8 is driven with a ratio of 3: 1 and carries on its upper part the gear 9 for the drive of the revolving lock system II for the reinforcement thread via the gear rim 90, furthermore a gear 10, which with a gear rim 100 for driving the revolving sinker lock 16 for the reinforcement thread is in engagement, and another gear 11 which drives the reinforcement thread guide S via a toothed ring 110 and a switchable coupling 27, 28. The machine table 13 carries a lower support frame 131 and the cylinder jacket 134, while an upper support frame 132 is arranged on the lower support frame 131 for receiving the machine head and the lock jacket 1133 with the fixed lock system 1 for the base and reinforcing thread.

Fig. 2 shows a detail of the encircling lock system 11 for the reinforcement thread. As can be seen from FIG. 1, the ring gear 90 is mounted in the lower support frame 131. The lock case 92 of the lock system 11 is attached to this ring gear 90. In the lock case 92 , a slide 91 is arranged such that it can be displaced radially relative to the cylinder. The lock parts 97 and 98, which act on the needle feet 3 ″ , are fastened to the slide 91 and can thus be brought into and out of engagement with the needle feet 3 ″ via the switching ring 31 ′ . The lower switching ring 30 ' has inclined surfaces 300' on its upper side, which when the upper switching ring 31 ' is rotated by a fork linkage engaging at its attachment 311' at a certain angle on the corresponding inclined surfaces 310 'of the switching ring 31' are supported and so the Shift the switching ring 31 ' axially upwards to the cylinder. On this switching ring 31 ′, the bolt 94 which rotates with the lock system II and which is fastened to an angle lever 93 slides. Due to the axial displacement of the switching ring 31 ' upwards, the bolt 94 is pushed up, whereby the angle lever 93 pivotable about the bolt 96 arranged on the lock case 92 acts on the pin 95 attached to the slide 91 , so that the slide 91 is pushed outwards and that Lock system 11 turns off. During the knitting of the reinforced part of the stocking, the lock system 11, which revolves at three times the cylinder speed, is switched on every third revolution in order to knit the reinforcing thread back from the end edge of the reinforcement to the starting edge. The periodic actuation of the switching ring 31 ' and thus the switching on and off of the lock system 1I is carried out by control means known per se, for example by a rotating cam disk which acts on a transmission linkage which engages the extension 311' of the switching ring 31 '.

In the same way, the coupling for driving the thread guide S for the reinforcement thread is actuated (FIGS. 1 and 8). This clutch consists of a clutch disk 28 with a lining 27 and is connected to the gear 110 by means of several support sleeves 29. A helical spring 291 is arranged in each support sleeve 29, which is supported on the coupling disc 28 and on the pressure bolt 292 and thus presses the covering 27 elastically against the yarn guide support ring 25 when the coupling is switched on. The clutch is switched by a pair of switching rings 31 and 30, the switching ring 30 being fixedly arranged on the guide cylinder 111 , while the switching ring 31 is rotatable through a certain angle and axially upwardly displaceable by means of the mutually supporting sloping surfaces 300 and 310. The guide cylinder 111 is connected to the machine frame via a support ring 131 '. The thread guide S is attached to a support arm 20 which is screwed tightly onto a block 24 and is thus connected to the thread guide support ring 25. By means of the ball bearing 113, the thread guide support ring 25 guided by angle pieces 26 is supported as it rotates on the stationary guide ring 112 , which is fastened to the guide cylinder 111. A buffer 23 intercepts the impact when the thread guide S is stopped by a stop when the reinforcing thread is knitted together with the base thread by the stopped lock system 1.

The clutch disc 28 is constantly driven by the gear pair 11 and 110 and rotates at the same speed as the lock system 1I. The switching linkage 32 acting on the attachment 311 rotates the switching ring 31 through a certain angle and the clutch disc 27, 28 is pressed against the yarn guide support ring 25 to drive the yarn guide S. The coupling 27, 28 is switched on each time shortly before or during the release of the thread guide S for the back-knitting release of the reinforcing thread, that is to say every third revolution of the lock system 1I for the reinforcing thread. The clutch is switched off during or shortly after the buffer 23 has hit a stop, that is to say it has reached the starting point again after one cycle. While the lock system 11 is turned off twice, the thread guide S for the reinforcement thread remains standing next to the thread guide G for the basic thread, and the coupling 27, 28 is released. This release of the coupling avoids unnecessary sliding of the thread guide S on the constantly rotating flange ring according to the main patent application, whereby wear is avoided and the force needed to overcome the friction is saved.

Together with the rotating lock system 11, the rotating sinker lock 16 is also periodically switched off and on so that sinkers are not operated simultaneously by the rotating sinker lock 16 and the stationary sinker lock 17. To control the sinker lock 16, a stationary ring 165 is attached to the upper support frame 132 (Fig.l), on which the guide pin 162 of the sinker lock slide 161 slides (Fig. 3, 4, 5 and 6). A spring 161 ' (FIG. 6) presses the slide 161 radially inward, which is mounted on the gear 100 by the cover ring 101 so as to be radially displaceable and rotates with it. The sinker lock 16 is attached to the slide 161.

In the sector in which the stationary sinker cam 17 is located 165 two control blades 163 and 164 mounted to the bolts 163 'and 164' are pivotally mounted on the ring, closing the annular track of the ring 165 depending on their position, or interrupt. If the sinker lock 16 is switched off, the guide pin 162 runs along the inside of the ring 165; when the sinker lock 16 is switched on, on the other hand, it runs along the outside of the ring 165. 3 shows the position at the moment when the sinker lock 16 is switched off, after the reinforcement thread alone has just been knitted back over the sector AB. The sinker cam 16 has overtaken the rotating with the cylinder sinkers 14 and this is operated on the platinum feet 14 ". The guide pin 162 slides along the inwardly pivoted control tab 163 along, causing the spring 161 'pushes the slider 161 to the inside. During the next two Circuits, the sinker lock remains switched off, so that when the rotating sinker lock 16 encounters the stationary sinker lock 17, the sinker feet 14 ″ pass unaffected behind the sinker lock 16 and only the sinker lock 17 is in action (Fig. 4). With each lock cycle, the cylinder Z rotates together with the sinker ring 141 by 120 °. 5 shows the position of the sector AB, on which the reinforcement is knitted, after a further revolution of the sinker lock 16, ie before the reinforcement thread is knitted back alone, precisely in the position in which the guide pin 162 is on the inwardly pivoted control tongue 164 slides along the outside of the ring 165, whereby the sinker lock 16 is switched on and when overtaking the sinkers 14 acts on the sinker feet 14 " so that the reinforcement thread is knitted back alone. Fig. 6 shows the same position in a perspective view.

The movements of the control tongues 163 and 164 are controlled independently of one another by two cam disks 191 and 192 (FIG. 7) which rotate together with the shaft 19 and are arranged with their cams offset by 120 °. The shaft 19 performs one revolution per cylinder revolution. The movement of the roller levers 193 and 194 is transmitted to the control tongues 163 and 164 via a linkage 169, 167 or 168, 166. Since the cam shaft 19 continuously, even during the knitting of the unamplified stocking portion is circulated, wherein the platinum lock must remain off 16, of the shift drum 18 via the control wedges 181 and 182 on the on the shaft 187 rotatably mounted rocker arms 183 and 184 act, the roller levers 193 and 194 are held in the concentric position, so that the cams remain without influence. The two rocker arms are each articulated via a connecting rod 185 or 186 to an angle lever 169 or 168 , respectively, in order to superimpose the switching movement of the drum 18 on the switching movement of the cam disks 191 and 192.

Of course, this control device can also be used for a multiple, e.g. B. use four or five times the lock system speed, change it only the control times of the device. In practice it has a threefold Speed proven to be advantageous and sufficient.

Claims (3)

PATENT CLAIMS: 1. Process for circular knitting of partially reinforced seamless hosiery, in particular fine stockings with a reinforced heel; Point and, if necessary, sole, by means of a base thread and an endless reinforcing thread according to patent application Sch 25014 VII a / 25 a (German Auslegeschrift 11 14 271) on a circular knitting machine with a rotating needle cylinder, a co-rotating lock system for the reinforcement thread alone and a stationary lock system for basic and reinforcing thread together, characterized in that for increasing the gain width of the the reinforcing thread alone processing lock system (II) and the associated sinker cam (16) in the same direction rotate at a more than two times the cylinder speed and together periodically only during one of its revolutions per revolution of the cylinder to Rückwärtsverstricken of Reinforcing thread are switched on alone, taking the reinforcing thread guide (S) with them. 2. Circular knitting machine for carrying out the method according to claim 1, characterized in that for switching the revolving lock system (1I) on and off and for actuating a clutch (27, 28) controlling the entrainment of the reinforcing thread guide (S), upper switching rings (31 ', 31) are provided, which are rotatable over a small angle and can be moved coaxially to the cylinder and with inclined surfaces (310 ', 310) on their underside on corresponding inclined surfaces (300', 300) on the upper side from the lower, stationary and coaxial to the cylinder support arranged switching rings (30 ', 30) . 3. Circular knitting machine according to claim 2, characterized by a stationary ring (165) arranged coaxially to the cylinder and having two control tongues (163, 164) which can be pivoted out and in independently of one another for controlling the sinker lock (16). Documents considered: German Patent No. 501 971.