DE2926773A1 - Knitted covering for continuous core thread - produced by knitting machine with concentric rotating yarn supply - Google Patents

Abstract

A circular knitting machine provides on a yarn or other flexible core a knitted covering, pref. of metallic wire. A stationary needle bar holding the needles in vertical grooves is surrounded by a rotation cam cylinder, on which is mounted, concentric with and above the needle bar, a platform carrying the spool of covering wire, which thus rotates with the cam cylinder. Specifically a rotating cam cylinder, surrounding a stationary needle-bar, carries at its upper end a collar on which are affixed three pillars. The latter support, above the knitting head, a platform carrying a hollow spindle on which a package of the covering material is mounted. A flexible core is fed downwards through the centre of the spool and on through the centre of the needle bar. The covering thread is fed to the needles via guide eyes, and break detector.

Description

DlPL-ING. HORST ROSE DJPL-ING. PETER KOSEL PATENT LAWYERS

.: 2959/1 D-3353 Bad Gandersheim ^{2 July}

BOCCA-COMORIO fcC.Sn c.
Request from

July 02, 1979

Circular knitting machine for covering a continuous core with a thread.

The invention relates to a circular knitting machine with a plurality of axially movable needles circumferentially around a cylindrical rod are arranged to be a continuous hollow thread or a continuous one To form a hollow strand, the movement of the needles being controlled by at least one cam disc which is rigidly connected to one on the Rod is connected to rotatable and peripherally arranged sleeve.

It is well known that circular knitting machines have a large number of needles, which are arranged circularly or on the circumference around a cylindrical rod and are axially movable with respect to the rod and are continuous can form hollow thread. These machines essentially have a plurality of working heads, each of which is provided with a rod is the axis of which is vertical and the longitudinal direction Having grooves, each of these grooves moving a knitting needle. These needles are driven by a cam that is coaxial is arranged to the rod and is controlled by a tubular, rotatable on the rod and coaxially arranged element. This rohrf Shaped element is usually set in rotation by a gear, which has a band or a belt that is connected to a the tubular element rigidly connected pulley runs.

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During the rotation, the cam disc ensures that the needles move move axially in a predetermined order to make a continental line to form hollow thread or a hollow braid from a thread material fed to the needles.

The object of the invention is to provide a machine of the type mentioned at the beginning Kind of creating a continuous coverage over the hollow thread or over any other core made of flexible material. In particular, the machine should cut the thread with a circular, from a Metal wire-formed mesh material cover to put on a cover of considerable aesthetic impact.

This object is achieved according to the invention in that it provides a support element for a coil made of a material in the form of a den Needles fed thread comprises, wherein the carrier element rigidly connected to the sleeve and with means for holding the bobbin coaxially of the rod and is provided with a bore, which is arranged coaxially with the rod, around the needles a continuous core of flexible Feed material to cover it with the thread material.

A further advantageous embodiment of the invention can be given in that the carrier element has at least three columns rigidly connected to the sleeve, the axes of which are parallel to the axis of the sleeve, the distance between the axes and the axis of the sleeve being essentially the same in each Trap is, and has a plate, which of the columns g
are firmly connected to the coil.

has which is carried by the columns with which the means for holding

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Based on the drawing, in which an embodiment of the invention is shown, the invention and further advantages and further improvements are to be explained and described in more detail.

It shows:

Fig. 1 is a perspective view of the essential parts

a machine according to the invention,

Fig. 2 is a perspective view of a working head

the machine according to the invention,

Fig. 3 is a longitudinal section through the working head according to the

Fig. 3,

4 shows an electrical circuit arrangement of the actuation

or control device of the machine,

Fig. 5 is a schematic side view of a winding srade s

the machine, in two different working positions,

Fig. 6 is a side view of the driver cylinder for the

machine made thread,

Fig. 7 is a sectional view of a braking device for the

Thread that is fed to a working head of the machine, and

8 is a schematic side view of the drive belt

for the working heads of the machine according to the invention.

Reference should now be made to FIGS. 1, 2 and 3. The machine according to the invention essentially has a carrier plate 1, those for holding a large number of working heads 2 (of which only one shown in FIG. 1) is provided, which working heads are driven by an electric motor 3 by means of an endless drive belt 4 are. By means of a further belt 5, the motor 3 continues to drive

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-A-

towards a speed reducing device 6, which by means of a belt 7; |

a multiple roller 8 drives, which with a driver roller or drive 1

Receiving roller 9 is tied up. By means of a further belt 10, 1

the latter has a disk 11 which is rigidly connected to a bevel gear 12

is bound, which meshes with another bevel gear 13, which |

the latter is wedged on a shaft 14 of a winding wheel 15. 1

Each working head 2 is a thread 16 or another core from %

?! flexible material supplied, which on a rotatable on a de- u

speaking rod supported by the machine frame ^i: i

Brought coil 17 is wound. The thread can come off the bobbin;

are wound and over a number of guide bars 19, 20 and 21; f

slide so that it goes through a predetermined path and follows a ί

the desired degree of preload. The thread then runs through;

Suitable guide elements 22 and 23 and a braking or tensioning device

direction 24 with a known structure (see Fig. 7), in order to

of the working heads 2 to be fed. S.

The thread covered or covered in the following way leaves the bottom of each working head, as shown in FIG. 1, only passes through
the driver roller 9 and then another roller 25 against which the
first roller under a predetermined pressure in any suitable manner,
for example by means of a pair of levers such as levers 26,
which are hinged to the machine frame at point 27, and of which
at least one with a handle 28 arranged to hold the
Roller 25 can lift off the roller 9, is provided, is pressed.

Each head 2, which is shown in perspective view in Fig. 2 and in longitudinal section in Fig. 3, has a substantially vertical one
Rod 31 (FIG. 3), which is firmly connected to the machine frame 1
and on which a sleeve 32 is rotatably mounted by means of a pair of ball bearings 33. The rod 31 is with an axial through hole

Mistake.

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The rod 31 is provided with a plurality of longitudinally extending Grooves 34 provided, in each of these grooves axially movably a trained in a known manner needle 35 is arranged, which with a Projection 36 is provided which fits into a groove in a cam disk which is essentially formed by two half-cam disks 37 and 38 is formed. Each of these is provided with an active contour which is arranged so that they coincide with the projection 3 & on the needles can act, and which is formed on one of its front surfaces. These contours are chosen so that when the cam disc rotates, the needles perform the required axial movement. Each of the two half-cam disks is connected to the sleeve 32 by means of a pressure screw 39 firmly connected, the front end of which is inserted into a corresponding recess provided in the half-cam disk, so that it can be adjusted or positioned at the correct angle to the sleeve 32. A spacer 40 is arranged between the two bearings 33, which is axially movable to the rod 31 and can be locked on this by means of a pressure screw 41, this locking is achieved by a radial, provided in the sleeve 32 bore 42. A cylindrical surface is provided on the lower part 43 of the latter sleeve, in order to receive the drive belt 4 which causes the sleeve to rotate about the rod 31. Except for the fact that this tape is over As the parts 43 of each head run, the tape also runs over a series of idle pulleys 44 (Fig. 8) which are rotatable on the Machine frame 1 are arranged according to the configuration shown in FIG Fig. 8 are shown.

A washer 45 of deformable material is advantageously arranged on the upper end of the rod 31 in order to form a guide for the upper part of the needles.

On top of the sleeve 32, an annular flange 48 is easily seen on which three vertically extending columns 49 are fixed, which are arranged so that they carry a plate 50 which is the carrier for a

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Forms coil 51 of material in the form of a wire. This coil is on the plate 50 is supported by a tube 52 which is inserted into the bore of an enlarged portion 53 of the plate and on the plate locked by means of a pressure screw 54 respectively. is attached. A pair of bearing shells 55 and 56 is on the tube 52 and in a bore 57 in the Coil 51 fitted, and each bearing shell has essentially a collar, which at the bearing shell 55 between the enlarged portion 53 and a disc 58 of a suitable deformable material, for example Felt, is arranged.

The wire material from the spool 51 is fed to the needles 35 by that it is through the bore 59 in one of the plate 50

60
supported arm and a pair of guides 61 supported on a block 62 rigidly attached to one of the pillars 49 slide therethrough.

A device is arranged between the bore 59 and the guides 61 which then emits a signal when the thread material fed to the needles breaks. This device has essentially a pair of elements which are carried by the plate 50, of which that which is provided with the reference numeral 63 (Fig. 2) is rigidly connected to the plate, while the other with the reference numeral 64 is relative can swing to the plate about a pin 65 substantially. The fixed element 63 is provided with at least one thread guide 66, whereas the element oscillating back and forth is provided with a head 67. When the back and herschwingende element 64 in a first position (shown by a solid line in FIG. 2), then passes the thread material of the coil 51 by the guide 66 of the fixed element 63, as shown in FIG. 2 can be seen, and the head 67 of the reciprocating member 64 is held in contact with the thread material.

The device also has a pivotally mounted and provided in the entirety by reference numeral 68 frame in

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essentially one rotatable on a rigid with the machine frame associated support beam 70 attached guide member 69, and a pair

having
of arms 71 and 72 / This framework can have two equilibrium positions

take, one of which with full lines in Fig. 2 is shown. In this position the arm 72 is substantially vertical,

the
and is in the path that the head 67 of the reciprocating element 64 travels through when it passes from the first position to a second position shown and indicated by a dashed line in FIG. 2 due to a centrifugal force. In the first equilibrium position, the arm 71 rests on the lower part of a further support beam 7 3, which is rigidly connected to the machine frame. In its second equilibrium position, shown by the dashed lines in FIG. 2, the framework 68 has rotated substantially 90 degrees clockwise (of FIG. 2) from the first position and its arm 72 rests on the support beam 73 .

5 and 7 show two further construction details of the invention Machine. In the first of these two, the shaft 15 of the winding wheel 16 rests on a pair of open bearings 74, which are essentially one Have a U-shape and only one of which is shown in FIG. Because of this structural arrangement and the relative position of the two Gear wheels 12 and 13 (Fig. 1) it is possible to lift the shaft 15 from its bearings together with the wheel to bring it into the upper position in Fig. 5 without dismantling any part of the machine.

Fig. 7 shows one of the braking or tensioning devices 34, which essentially a rod 75 and a pair of washers wedged onto the rod 75, one of which washers axially on the Rod is locked, whereas the other is pressed against the first by means of a conical helical spring 77, the seat of which in a suitable manner by the action of a threaded section the rod 75 screwed bush 78 can be changed. In this way, a tangential frictional force with a

-8th-

90 9883 / 08U

predetermined value on the thread 16, which is between the discs 76 is to be applied.

Fig. 4 shows an electrical circuit arrangement for control; ■,

the speed of the electric drive motor 3 of the machine.

A series "power" circuit is connected between terminals 101 and 102 to a main AC power supply (not shown).

the circuit arrangement having a fuse 103, an electronic switch 104 and an electrical three-phase current 3 in this order. The motor is preferably of the single phase V induction type. For example, the switch 104 can be a triac and the fuse can be a fast acting fuse to protect the triac. Terminals 101 and. 102 are connected to the inputs of a rectifier block 106, which emits a direct voltage reference signal at a first output, the amplitude of which can be continuously changed between a minimum value and a maximum value, which can be done, for example, by means of a potentiometer. The block 106 'i further has a changeover switch, not shown, which allows to pass the signal present at the output 107, and a non-%

I.

shown capacitor (vein capacitance), the sudden changes in the ■

electrical signal fed to the output 107. The block 106 also has a second output 108 which is connected to earth and the output 107 is connected to the non-reversible input 109 of a comparator block 110, for example an operational amplifier. The input 111 of the block 110 is connected to a first output terminal of a tachometer generator 112, the second of which!

Output is connected to earth. The Generatorll2 is torsion-proof with!

connected to the drive shaft of the motor, not shown, so that -1

it comparable with the same speed as the drive shaft itself to ^rotate: sets is, and generates a DC voltage at the output terminals,

which is proportional to the speed.

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The output signal from the block 110 is fed to the input of an amplifier block 113, which generates control signals which the Control input of the electronic switch 104 are supplied.

The operation of the machine described above is as follows. A thread 16 made of flexible material, for example from a hollow Hose made of mesh material or some other core made of flexible material is passed from the spool 17 to the needles 35 of each head supplied that it runs along the path shown in FIG. This thread is then first through the hole in the tube 52 (Fig. 3) and then passed through the axial bore in the rod (51). A coil of suitable material, for example metal wire, is mounted on the plate 50 of each head with the washers 55 and 56 inserted into the bore 57 of the spool and with the felt washer 38 sits between the collar of the first letter and the bottom surface of the spool. The thread is through the bore 59 of the arm 60 and the guide 66 of the stationary element 63 passed through. The head 67 of the oscillating element rests against the thread, as can be seen in FIG. can recognize. The thread then runs through the guides 61 of the block 62 and arrives between the working parts of the needles 35.

Then the electric motor 3 for the machine is turned on. In the position in which the machine is not in operation, in which the electric motor is at rest, is the electrical signal at the output 107 (FIG. 4) of the Block 106 equals 0. Since the electrical signal generated by the tachometer generator 112 is also 0 due to the fact that the motor 105

is at rest, there is no imbalance between the inputs 109 and 111 of the comparator block 110 and therefore no control signal:, is fed to the control input of the electronic switch 104. Every

S gradual increase in the reference signal at output 107 of block 106

|| creates an imbalance between input 109 and input

Il 111 of block 110 with the result that a control signal is sent to the control input

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of the switch 104 is supplied by means of the amplifier block 113. This creates a gradual increase in the current at terminals 101 and 102 towards the motor, which begins to rotate, thereby also causing the tachometer generator 112 to rotate, with the result that an electrical signal is generated between the output terminals of the latter . This signal, which is fed to input 111 of block 110, increases proportionally with the increase in the speed of the motor until a speed is reached which is so great that the signal at input 111 is approximately equal to the reference signal, which is present at terminal 109. In this state, the signal fed to the control input of the switch 104 is reduced and the speed of the motor shaft is controlled with a reverse reaction control so that this speed is kept constant when the load on the shaft varies. In the example described, the motor 3 is started up in stages by actuating the potentiometer until the desired speed is reached.

In the same way, it is possible to set the potentiometer to a predetermined, fixed resistance value and to put the motor into operation by means of the changeover switch with which the reference signals are fed to the output 107 of the block 106. Since this changeover switch emits a graduated control signal, the value of the reference signal s increases in steps, since the capacitor contained in block 106 is connected in such a way that it generates a temporary increase in the reference signal at output 107. This signal rises essentially like a ramp function, which enables a stepped imbalance between the inputs 109 and 111 of the block 110 and thus a step-by-step start-up of the motor 3.

The capacitor also acts analogously when the changeover switch is operated to stop the motor 3. After actuation of the switch there is a gradual reduction of the reference signal, which is fed to the output 107 of the block 106 under these circumstances

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• what will be a gradual decrease in imbalance between the signals at the inputs 109 and 111 of the block 110 and a gradual decrease in the switch 104 via the amplifier block 1] 3 applied control signals. In general, the capacitor works over any speed set by means of the potentiometer automatically to avoid any sudden speed change in the motor 3 and consequently dangerous effects on the tensile force on the needles 35 to avoid fed thread.

During the rotation of the sleeve 32, the half-cams steer and 38 the axial movement of the needles in a customary and known manner so that these needles form a circular stitch around the thread 16, which comes out of the axial bore of the rod 31 and between the two driver rollers 9 and 25, which exert a tensile force on it , runs through. The thread is then wound onto the shaft 16, which is driven by the same motor by means of the speed reduction device 6 and the drive described above is driven. The removal and replacement of the wheel is done instantly, with only the shaft 14 must be raised in order to remove them from their bearings 74, as shown in FIG.

Of course, a number of changes can be made both in the form and in the arrangement of the various parts without departing from the scope of the invention. For example, the motor 3 could be a three-phase induction motor be replaced; in this case it would be powered by three electronic switches corresponding to switch 104, which three switches are suitably operated by three control signals coming from the block.

Patent attorneys Dipl.-Ing. Hor6t Röse Dtp1 .-! Ed. Peter Kosel

909883/0814

Claims (14)

DlPL-ING. HORST ROSE DIPL-ING. PETER KOSEL PATENTANWÄLTE un. «R · ΑΜβΊ-No .: 2959/1 D-3353 Bad Gandersheim, July 2, 1979 BOCCA - COMORIO & C. S.n. c. Request from the claim 1. Circular knitting machine with a large number of axially movable needles which are arranged on the circumference around a cylindrical rod, around a continuous hollow thread or a continuous hollow one To form heald, the movement of the needles being controlled by at least one cam disc which is rigidly rotatable with one on the rod and is connected to a sleeve arranged peripherally thereto, characterized in that it is a carrier element for a coil (51) made of a material in the form of a thread (16) fed to the needles (35), the Tfägerelement being rigidly connected to the sleeve and with means for holding the coil coaxially with the rod (18) and with a bore which is arranged coaxially with the rod, is provided to feed a continuous core of flexible material to the needles in order to cover it with the thread material. 2. Machine according to claim 1, characterized in that the support element has at least three columns rigidly connected to the sleeve (32), the axes of which are parallel to the axis of the sleeve, the distance between the axes and the axis of the sleeve being substantially the same in any case, and has a plate (50) which is carried by the columns ^and to which the means for holding the coil (51) are firmly connected. 3. Machine according to claim 1 or 2, characterized in that the Λ columns (49) are firmly connected to an annular flange (48), -2- 909883/0814 -2- which is formed at the upper end of the sleeve (32) and in one piece with it. 4. Machine according to one of the preceding claims, characterized in that that the means for holding the coil (51) a tube (52) and inserted into a Bohnng in an extension on the plate a pair of sleeves (55, 56) keyed on the tube with a certain clearance or slack, each of the sleeves having one substantially cylindrical portion adapted to be inserted into the axial bore of the spool, and an annular projection arranged to come into contact with the end face of the spool. 5. Machine according to claim 4, characterized in that the means for holding the bobbin (51) also have a felt washer (58), disposed between the spool and the annular projection on the lower sleeve (55) of the pair of sleeves (55, 56). 6. Machine according to one of the preceding claims, characterized in that that the sleeve is supported on the rod at least by means of a pair of ball bearings (33), and that it is axially relative to the rod (31) is locked by means of a ring which can slide on the rod and is firmly connected to it by means of a pressure screw (41) and between the bearings or is arranged between one of the bearings and a shoulder on the sleeve. 7. Machine according to one of the preceding claims, characterized by means for generating an electrical signal upon breakage of the thread fed from the bobbin to the needles and through a pair of elements carried by the sleeve, one of which is pivotally mounted and the other of which is fixed relative to the sleeve, at least one of the elements is provided with a part over which the thread runs across it, the reciprocating element being off a first position in which part of the vibrating element is substantially in contact with that traversed by the thread Part of the held thread stands, swings into a second position in which on 909883 / 08U " ³ " -3- Because of the effect of centrifugal force and on the breakage of the thread towards the vibrating element assumes a position which is radially further out than the first, so that its path with an actuating element collapses, which is arranged so that it generates the electrical signal, and strikes against the latter element, thereby this actuated. 8. Machine according to claim 7, characterized in that the actuating element comprises a framework which oscillates between two equilibrium positions, the framework being an electrical one The circuit closes when it is in one of the equilibrium positions and leaves the circuit open when it is in the other position is, the impact of the reciprocating element against the oscillating framework ensures that the latter out of the one reaches the other equilibrium position. 9. Machine according to claim 7, characterized in that the reciprocating framework two substantially perpendicular to each other has extending arms which protrude from a bushing that rotates back and forth on a first beam so that in one of the equilibrium positions a first of the arms rests on a second beam parallel to the first arm and that the second arm is in the path of the vibrating element is arranged and that in the other of the equilibrium positions the second arm rests on the second beam which follows the rotation of the sleeve on the first beam. 10. Machine according to one of the preceding claims, characterized in that that the sleeve is set in rotation by an electric motor controlled or actuated by a circuit for controlling its speed is that the circuit has means that feed the motor a stepped and adjustable signal, so that the motor from a first into a second, controlled by the circuit speed, so that the sleeve -A- 909883/0814 -4- is brought to its predetermined working speed in stages and in stages keeps its speed. 11. Machine according to claim 10, characterized in that the Means have a capacitor. 12. Machine according to claim 10 or 11, characterized in that the electric motor is a single-phase induction motor. 13. Machine according to claim 11, characterized in that the Electric motor is a three-phase induction motor. 14. Machine according to one of the preceding claims, with a rotatable, by an electric motor driven wheel, on which the covered, produced by the machine strand is wound, thereby characterized in that the wheel is supported on a pair of substantially U-shaped bearings and that the movement is on the wheel can be transmitted by means of a drive which has a pair of bevel gears has, one of which is rigidly connected to the shaft of the wheel and the other is arranged substantially below it, so that the wheel can be separated from the bearings by simply lifting the shaft from the bearings. Patent attorneys Dipl.-Ing. Hear rose Dipl.-Ing. Peter Kosel 909883/0814