Drive chain for a loop-forming member of a circular knitting machine and circular knitting machine having the drive chain

Abstract

A drive chain for a loop forming member of a circular knitting machine includes an element (6) connected to or to a loop forming member, and a swing arm (7) connected to the element (6) at an engagement area. The swing arm (7) is configured to interact with a selection device (23) to swing relative to the element (6). The element (6) includes a first portion (9) carrying a first heel (18) and a second portion (10) configured to slide into the bottom of a corresponding groove (5). The first portion (9) and the second portion (10) are resiliently connected to hold the first heel (18) in an operating position where the first heel (18) protrudes from the groove (5) and to allow the first heel (18) to return to the groove (5) in the event of interference with one of the first actuation triangles (25).

Description

Technical Field

[0001] The present invention relates to a drive chain that is operatively associated with or combined with a coil forming member (e.g., a needle or sinker) that is part of a circular knitting machine.

[0002] The present invention also relates to a circular knitting machine including the drive chain.

[0003] Specifically, the present invention relates to the structure of a drive chain actuating coil forming member, which converts the relative rotational motion between the drive chain and the actuating triangle into the axial motion of the coil forming member.

[0004] More specifically, the present invention relates to the structure of a drive chain for a circular knitting machine, which is capable of selecting loop forming members (needle-needle selection) one-to-one according to different paths based on the fabric to be knitted. Background Technology

[0005] As is well known, a circular knitting machine includes: a needle holding element (needle cylinder and / or needle plate) on which one or more series of knitting needles are arranged in corresponding grooves along a circular path (circular needle bed); and a device adapted to control the movement of the needles (for forming a knitted fabric).

[0006] Some machine types also include a loop-removing sinker arranged in a radial base, which is obtained in an annular body (sinker crown) arranged around the needle holder, and the sinker engages with the needle to produce knitted fabric. The means for controlling the needle of the needle holder includes an actuating cam arranged around the needle holder itself, and a drive chain configured to operatively connect the cam to the needle. Each such drive chain includes one or more flat portions inserted into each recess and below each needle. The drive chain has a heel configured to engage with the actuating cam.

[0007] Known circular knitting machines have needle-needle selection, that is, they have a system that can select needles one-to-one according to different paths based on the fabric to be knitted.

[0008] For example, a type of drive chain consisting of a sub-needle and a oscillating rod hinged to the sub-needle is known. The sub-needle has a fixed heel that protrudes from a corresponding groove when inserted into a sliding base of the needle cylinder. The oscillating rod has a movable heel and a selection tooth, configured to interact with a piezoelectric device equipped with an actuating rod. The fixed heel engages with a corresponding triangle to align the selection tooth with the actuating rod of the piezoelectric device, so that if selected, the movable heel can engage the lifting triangle.

[0009] Furthermore, it is known that the transmission chain consisting of the sub-needle and the oscillating rod does not interact with the piezoelectric device, but rather cooperates with the actuating electromagnet.

[0010] For example, patent IT1293789, granted to the same applicant, discloses a knitting needle that includes a lower part, also called a sub-needle, having a fixed heel and a swing arm hinged to the needle at its longitudinal end opposite the tip, the swing arm rotating about a hinge axis that is substantially perpendicular to the side of the needle.

[0011] The oscillating lever includes a movable heel for facing the actuation triangle of the needle-holding member, and defines a path engaged by the fixed heel of the sub-needle and a path selectively engaged by the movable heel of the oscillating lever. The oscillating lever rotates electromagnetically between an operating position and a non-operating position. Summary of the Invention

[0012] The applicant has identified some defects in the framework of the circular knitting machine, as disclosed above, which is equipped with needles paired with sub-needles and oscillating rods.

[0013] Specifically, the applicant has discovered that during machine operation, the fixed heel of the sub-needle may not contact or slide over the triangle along the path defined by the triangle, but instead impacts the triangle itself and breaks or is damaged in some way, thus affecting the proper movement of the needle and sub-needle. This malfunction necessitates stopping the machine for necessary repairs, resulting in downtime and reduced productivity.

[0014] The applicant further discovered that while the drive train consisting of the sub-needles and the oscillating bar is compact and can limit machine size, it does not provide high selectivity. This accuracy does depend on the length of the oscillating bar, because, given the same rotation angle around the pivot, the linear motion of one element of the oscillating bar (such as the teeth or moving heel mentioned above) depends on the distance between that element and the pivot, and this distance is relatively small.

[0015] In these cases, one object of the present invention in its various aspects and / or embodiments is to provide a drive chain for a loop forming member of a circular knitting machine that can prevent breakage of the heel, which is an element that is attached to, connected to, or will be connected to the loop forming member.

[0016] Therefore, one object of the present invention is to provide a drive chain that makes circular knitting machines safer and more reliable.

[0017] Another objective of this invention is to provide a drive train that can improve productivity and reduce maintenance costs of circular knitting machines.

[0018] Another objective of this invention is to provide a drive train that can improve selection accuracy while keeping the overall size of the drive train substantially unchanged compared to prior art drive trains.

[0019] As will become clearer from the following description, these and other possible objectives, in combination in various ways according to the following aspects and / or embodiments, are achieved by the drive chain of the loop forming member for the circular knitting machine and the circular knitting machine itself.

[0020] In this specification, the terms "upper," "lower," "above," and "below" relate to the machine's positioning during normal operation, wherein the central axis of rotation of the syringe holder is in a vertical position with the syringe needle pointing upwards. In this specification, the terms "axial," "circumferential," and "radial" relate to the central axis.

[0021] Some aspects of the invention are listed below.

[0022] In one aspect, the present invention relates to a drive chain for a loop forming member of a circular knitting machine, comprising:

[0023] An element, which incorporates a coil forming member, is operably connected to, or will be connected to a coil forming member; wherein the element has a first heel and is configured to engage in a first path defined by a first actuation cam of a circular knitting machine;

[0024] The swing rod is connected to the element in the engagement area and extends on the opposite side of the coil forming member relative to the element; the swing rod has a second heel;

[0025] The swing arm is configured to interact with at least one selection device of the circular knitting machine to swing relative to the element between a take-up position and a retracted position. In the take-up position, the second heel is removed from a corresponding groove in the support of the circular knitting machine and engages with a second path defined by a second actuation triangle. In the retracted position, the second heel is retracted into the corresponding groove and thus does not engage with the second path.

[0026] The element having a first heel includes a first portion that carries the first heel and a second portion that is configured to slide in connection with the bottom of a corresponding groove;

[0027] The first part and the second part are elastically connected to keep the first heel in the operating position where the first heel protrudes from the groove, and to allow the first heel to return to the groove in the event of interference with one of the first actuation triangles.

[0028] In one aspect, the present invention relates to a circular knitting machine, comprising:

[0029] A support member having a plurality of grooves arranged around the central axis of the support member;

[0030] Multiple coil forming components, each of which is at least partially accommodated in a corresponding groove;

[0031] A first actuating triangle and a second actuating triangle facing the groove; wherein the support member is movable about a central axis relative to the first actuating triangle and the second actuating triangle, thereby determining or causing the coil forming member to move along the groove to form a coil through the coil forming member;

[0032] Multiple drive chains, each drive chain being implemented according to one or more of the foregoing aspects and / or the following aspects, wherein each drive chain is received in a corresponding groove and coupled to a coil forming member, or is operably connected to a coil forming member, or will be connected to a coil forming member;

[0033] At least one selection device that interacts with the drive chain.

[0034] The applicant has confirmed that the present invention can achieve the above-mentioned objectives.

[0035] The applicant first verified that the invention allows for the prevention of the first heel (positioned with a coil-forming member, and a portion of this element being coupled to, operably connected to, or to be connected to the coil-forming member) from impacting the triangle and thus damaging or destroying the first heel body and / or the drive chain to which the first heel belongs. The applicant has indeed demonstrated that the invention allows the first heel to be inserted into a corresponding groove to prevent it from interfering with one of the first actuating triangles. Furthermore, this (insertion) movement is achieved without increasing the size of the drive chain, relative to known drive chains, i.e., those with fixed heels that cannot be inserted.

[0036] The applicant further verified that the insertion and rebound of the first heel enable the restoration of the position of the transmission chain and coil forming components. In fact, after the first heel (due to incorrect interaction with the triangles or due to incorrect positioning by the operator) returns to the groove, it leaves the groove again when it finds a suitable space, propelled by the aforementioned elastic connection, and returns to one of the planned tracks / paths defined by the triangles.

[0037] Therefore, the applicant has demonstrated that the present invention can make circular knitting machines safer and more reliable, thereby increasing productivity and reducing maintenance costs.

[0038] Other aspects of the present invention are listed below.

[0039] On one hand, the coil forming component is a needle, or a sinker, or a punch, or a spring, or a hook.

[0040] On one hand, the support is a cylinder, a plate, or a crown.

[0041] On the one hand, the grooves are parallel to the central axis or radiate relative to the central axis.

[0042] On one hand, the first and second actuating triangles are fixed and the support rotates around the central axis, or vice versa, the support is fixed and the first and second actuating triangles rotate around the central axis.

[0043] On one hand, the element having a first heel, a swing rod, and a loop forming member is the flat part of a circular knitting machine.

[0044] On one hand, the coil forming member rests against or is configured to rest against (in at least some operating steps) the element having a first heel.

[0045] On one hand, the coil forming member and / or the element having the first heel has a hook configured to hook the coil forming member and the element having the first heel to each other.

[0046] On one hand, the first part defines a hook for engaging and disengaging from the base obtained on the coil forming member.

[0047] On one hand, when the first heel returns to the groove, the hook disengages from the base obtained from the coil forming member.

[0048] On one hand, the coil forming member is integral with the element having a first heel, and optionally integral with a second portion of the element.

[0049] On one hand, the coil forming member is rigidly connected to the element having a first heel.

[0050] On one hand, the coil forming member is connected to the element having the first heel via a yielding connector, or optionally a resilient connector.

[0051] On one hand, the yielding connector is a thin, flat section that extends along the groove.

[0052] On one hand, the element having a first heel includes an elastic connector that connects the first part to the second part, such that the first part can be elastically rotated relative to the second part.

[0053] On one hand, the yielding connector is configured to allow the first part to rotate relative to the second part, while the coil forming member remains aligned with the corresponding groove, i.e., not tilted.

[0054] On one hand, as the first part rotates, the yielding connector bends in the radial plane, thus forming a wave.

[0055] On one hand, the elastic connector is a torsion spring.

[0056] On one hand, the flexible connector is placed on the mating area.

[0057] On one hand, the swing arm is hinged to the element on a rotational pivot located in the engagement area.

[0058] On one hand, the engagement area includes a rotating pivot.

[0059] On one hand, the engagement area is defined by a rotational pivot.

[0060] On the one hand, the flexible joint defines the rotation pivot.

[0061] On the one hand, the pivot of rotation is substantially aligned with the center of rotation of the first part relative to the second part.

[0062] The applicant has demonstrated that combining the flexible joint with the rotating pivot of the swing arm allows for greater freedom within a certain range of selection of the pivot / joint portion along the drive train based on the desired functional characteristics.

[0063] On the one hand, the flexible joint is C-shaped or open annular.

[0064] On one hand, the resilient joint partially surrounds the proximal end of the swing arm, allowing the proximal end to rotate within the resilient joint.

[0065] On one hand, the proximal end of the swing arm has a shape that is at least partially circular so as to allow rotation within the flexible joint.

[0066] On one hand, the resilient joint is configured to leave a minimum clearance at the proximal end of the swing arm even when the resilient joint is in its maximum twisted configuration (i.e., the first heel returns to the groove). Therefore, this minimum operating clearance allows the pivot to rotate even when the resilient joint reaches its maximum twist.

[0067] On one hand, along the main extension direction of the transmission chain, the engagement area (optionally a rotational pivot) is positioned between the coil forming member and the first heel. The engagement area (optionally a rotational pivot) is closer to the coil forming member (compared to its distance from the first and second heels).

[0068] On one hand, given Y is the distance between the connection or interaction area between the coil forming unit and the transmission chain and the elastic joint, given X is the distance between the elastic joint and the first heel, and the ratio of X / Y is greater than 1.

[0069] On one hand, the X / Y ratio is between 2 and 5.

[0070] On one hand, given Z is the distance between the rotation pivot and the second heel, the ratio of Z / X is greater than 1.

[0071] On the one hand, the Z / X ratio is between 2 and 6.

[0072] The applicant has demonstrated that by moving the pivot / joint toward the coil forming member and thus extending the swing arm, selection accuracy can be greatly improved, even by up to double, compared to conventional drive chains (as disclosed in patent IT1293789).

[0073] On one hand, the first part extends mainly from the rotation pivot toward the second heel and has an edge facing the swing arm.

[0074] On one hand, the edge is configured to engage with the swing arm (when the first heel returns to the groove) and move the swing arm to a non-operating position.

[0075] On one hand, the edge is configured to push the swing arm to a non-operating position.

[0076] The applicant has demonstrated that, in the case of contact between the first heel, a specific interaction between the heels (the first heel embeds into the second heel, but not vice versa) can interrupt the translational movement of the second heel within the groove. Therefore, the system is completely safe and configured as if it had a force limiter: in the event of a selection problem, the transmission chain would interrupt translation.

[0077] On one hand, the first part includes the end of the stroke arranged along the main extension direction of the drive chain between the flexible joint and the coil forming member.

[0078] On one hand, when the first heel is in the operating position, the end of the stroke rests against the bottom of the corresponding groove, and when the first heel returns to the groove, the end of the stroke leaves the bottom of the corresponding groove.

[0079] The applicant has confirmed that the end of the stroke prevents the first heel from protruding from the corresponding groove beyond the necessary extent, thereby avoiding possible further contact with the triangular components.

[0080] In one aspect, the first part includes a portion arranged along the main extension direction of the drive chain between the flexible joint and the coil forming member.

[0081] On one hand, the portion has a height that substantially corresponds to the depth of the groove.

[0082] On one hand, the portion has a radially outer edge that is rounded so that it never protrudes from the groove even when the first portion rotates relative to the second portion.

[0083] On one hand, the portion is arc-shaped and partially arranged around the resilient joint.

[0084] On one hand, the portion and the resilient joint define an arcuate groove between them.

[0085] The applicant has demonstrated that the portion can better withstand lateral loads acting on the first heel. The applicant has also demonstrated that the portion serves as a guide for the drive chain within the groove and ensures that the flat portions (coil forming member and drive chain) move more regularly and smoothly within the groove.

[0086] In one respect, the portion includes the end of the stroke.

[0087] On one hand, the end of the stroke is defined by the edge of the portion facing the bottom of the corresponding groove.

[0088] On one hand, the swing arm has at least one selection tooth, which is configured to interact with at least one arm of the arm-type selection device.

[0089] On one hand, the second heel is located at the far end of the swing arm.

[0090] In an alternative, the swing arm has a distal segment configured to interact with a magnetic selection device.

[0091] On one hand, the distal segment of the swing arm is configured to bend elastically.

[0092] On one hand, the second heel is located between the first heel and the distal segment, and it is configured to allow the swing arm to bend elastically.

[0093] On one hand, the second part includes at least one flat rod-shaped segment.

[0094] On one hand, the second part includes a resiliently deformable distal segment, which itself has a distal end resting on the swing arm.

[0095] On one hand, the elastically deformable distal segment is configured to push the swing arm toward the extraction position and to hold the swing arm in the extraction position.

[0096] In one aspect, according to a variant of the embodiment, the resilient joint is located at a distance from the engagement area and optionally at a distance from the rotation pivot.

[0097] On one hand, the mating area includes an auxiliary resilient joint.

[0098] On one hand, the auxiliary flexible joint is configured to elastically deform and optionally bend when the swing arm swings.

[0099] On the one hand, the flexible joint and the auxiliary flexible joint are at least partially combined with each other.

[0100] On the one hand, the flexible joint is placed near the coil forming member.

[0101] On one hand, the flexible joint is placed at one end of the drive chain, which is on the opposite side relative to the far end of the swing arm.

[0102] On one hand, the flexible joint has a first curved segment directly connected to a first part, a second curved segment directly connected to a second part, and a straight segment connecting the first curved segment to the second curved segment.

[0103] On one hand, in the joining region, a rotatable pivot is optionally located between the flat rod-shaped segment and the elastically deformable distal segment.

[0104] On one hand, the first actuation triangle includes at least one deflection triangle configured to interact with the first heel and guide it to one or another of the first paths.

[0105] On one hand, the deflection triangle has a bevel, which is configured to gradually push the first heel into the groove in the event of interference with the deflection triangle.

[0106] On one hand, the at least one selection device is arm-type, optionally piezoelectrically actuated, and interacts with the selection teeth carried by the oscillating rod of the transmission chain.

[0107] In an alternative aspect, the at least one selection device is magnetic, optionally of an electromagnetic type having one or more magnets, and interacts with the distal segment of a swing arm of a transmission chain configured for elastic bending.

[0108] Other features and advantages will become more apparent from the detailed description of a preferred embodiment of the drive chain of the coil forming member for a circular knitting machine according to the invention. Attached Figure Description

[0109] The following description will refer to the accompanying drawings, which are merely indicative and therefore not restrictive, in which:

[0110] Figure 1 An enlarged detail of a circular knitting machine is shown, in which the drive chain according to the invention is schematically shown, and the knitting needles are paired with actuation cams;

[0111] Figure 2 , Figure 3 , Figure 4 and Figure 5 One of them, housed in a recess, is shown in its respective side view and operating configuration. Figure 1 The transmission chain;

[0112] Figure 6 , Figure 7 and Figure 8 The variations of the drive train shown in the previous figures are illustrated in their respective operating configurations.

[0113] Figure 8A It shows Figure 6 , Figure 7 and Figure 8 A variant in which the distal segment is modified;

[0114] Figure 9A and Figure 9B A different embodiment of the drive train according to the present invention is shown;

[0115] Figure 10 yes Figure 1 An enlarged view of a portion of the triangle;

[0116] Figure 11 It is based on Figure 10 A sectional view of the XI-XI plane;

[0117] Figure 12 It is based on Figure 10 A sectional view of the XII-XII plane;

[0118] Figure 13 and Figure 14 It shows Figure 1 The triangle, the transmission chain under their respective working conditions;

[0119] Figures 15 to 17 It shows Figure 13 and Figure 14 The triangle, the drive train in a fault condition; and

[0120] Figures 18 to 29 A further variant of the transmission chain according to the invention is shown.

[0121] Explanation of reference numerals in the attached figures:

[0122] 1: Disc

[0123] 2: Knitting needles

[0124] 3: Transmission chain

[0125] 4: Needle holder

[0126] 5: Radial groove

[0127] 6: Components with a first heel

[0128] 7: Swing rod

[0129] 8: Rotation Pivot

[0130] 9: Part One

[0131] 10: Part Two

[0132] 11: Flexible joint

[0133] 12: Elastically deformable distal segment

[0134] 13: The distal end of an elastically deformable distal segment

[0135] 14: Curved section

[0136] 15: End of the journey

[0137] 16: Radial outer edge

[0138] 17: Conical section

[0139] 18: First heel

[0140] 19: Edge

[0141] 20: Proximal end of the swing arm

[0142] 21: Select teeth

[0143] 22: Second heel

[0144] 23: Piezoelectric Selector

[0145] 24: Arm

[0146] 25: First Actuation Triangle

[0147] 26: First Path

[0148] 27: Second Actuation Triangle

[0149] 28: Second Path

[0150] 29: Skewed Triangle

[0151] 30: Bevel

[0152] 31: Magnetic selection device

[0153] 32: Magnet

[0154] 33: Distal segment of the swing arm

[0155] 34: First bending segment

[0156] 35: Second bending segment

[0157] 36: Straight segment

[0158] 37: Flat rod-shaped segment

[0159] 38: Settling Plate

[0160] 39: Hook

[0161] 40: Yielding connector

[0162] 41: Base

[0163] 42: Auxiliary flexible joint

[0164] XX: Central axis Detailed Implementation

[0165] Referring to the above figures, the drive chain according to the invention is described in an exemplary and non-limiting manner, with reference to its application in the needle holder plate associated with the various actuation cams of a circular knitting machine for manufacturing fabrics, which is not shown as a whole.

[0166] As is well known, a circular knitting machine includes a base constituting the support structure of the circular knitting machine. A needle holder is mounted vertically on the base and has multiple longitudinal grooves on its radially outer surface. These longitudinal grooves are arranged around the central axis "XX" of the needle holder and generally extend parallel to said central axis "XX". Each longitudinal groove accommodates a respective drive chain, including multiple flat portions and (at least partially) a respective needle. Actuation triangles are arranged as a housing around the needle holder and face the radially outer surface of the needle holder and therefore the longitudinal grooves and drive chains. These actuation triangles define tracks / paths arranged on the inner surface of the housing. The knitting machine described herein by way of example also includes a needle holder plate having multiple grooves extending radially relative to the central axis "XX". Each radial groove accommodates a respective needle and a respective drive chain, the drive chain including multiple flat portions. Actuation triangles supported by a disc face the needle holder plate and the radial grooves and define their respective tracks / paths. The needle holder and needle holder plate are rotated about the central axis "XX" by a motor. Figure 1 The arrow R in the diagram represents the needles, while the housing and the disk with the actuation triangle are fixed. The needles and / or drive chain have heels that engage / will engage with the track / path, such that relative rotation between the needle holder and the housing, and between the needle holder plate and the disk, causes the needles to move in corresponding longitudinal and radial grooves. A selection device interacts with the drive chain arranged in the longitudinal and radial grooves to selectively actuate the needles, enabling them to travel along a given track / path and form loops, i.e., fabric production.

[0167] Figure 1The lower part of the disk associated with the needle holder is shown, denoted by the number 1. Disk 1 has actuation triangles that define tracks / paths that extend circumferentially around the central axis "XX". Figure 1 The knitting needles 2 and drive chain 3 according to the invention are also schematically shown, which are associated with cams / tracks / paths and are housed in radial grooves in the needle holder plate. Figure 1 It is not shown in the diagram, but is located facing disk 1.

[0168] Figure 2 , Figure 3 , Figure 4 and Figure 5 A portion of the needle holder plate 4 and the disk 1, and a drive chain 3 associated with a corresponding knitting needle 2 according to the invention, are shown in a cross-section according to a radial plane containing the central axis "XX". The drive chain 3 is accommodated in a corresponding radial groove 5 of the needle holder plate 4 and opens upward. The disk 1 with an actuation triangle is arranged above the needle holder plate 4, and the track / path defined by the actuation triangle faces the radial groove 5.

[0169] Figures 2 to 5 The transmission chain 3 shown includes: an element 6 (referred to in certain cases as a sub-needle) operably connected to a corresponding knitting needle 2, and a swing arm 7 hinged to said element 6 at a rotational pivot 8, the rotational pivot 8 defining a rotation axis of the swing arm 7 perpendicular to a radial plane containing a central axis "XX". The rotational pivot 8 defines an engagement area between the swing arm 7 and the element 6.

[0170] In the example shown here, the knitting needle 2 is a distance away from the drive chain 3 and is configured to contact the element 6 and be pushed by the drive chain 3 during operation of the circular knitting machine.

[0171] The swing rod 7 extends on the opposite side of the knitting needle 2 relative to the element 6.

[0172] Component 6 includes a first part 9 and a second part 10 interconnected by a flexible joint 11. The first part 9, the second part 10, and the flexible joint 11 are integrally formed.

[0173] The second part 10 includes a flat rod-shaped segment that rests against and slides relative to the bottom of the groove 5. An elastic joint 11 is located at the end of the flat rod-shaped segment and is C-shaped or open-ended. This C-shape extends continuously from the flat rod-shaped segment and finally connects to the first part 9. In other words, one end of the C-shape is connected to the flat rod-shaped segment, and the other end of the C-shape is connected to the first part 9. In the illustrated embodiment, an elastically deformable distal segment 12 extends from the end of the flat rod-shaped segment in a direction opposite to that of the bearing elastic joint 11. Furthermore, the elastically deformable distal segment 12 has an elongated shape and has its own distal end 13 at a distance from the bottom of the groove 5.

[0174] The first part 9 includes an arcuate portion 14 (e.g., a sickle-shaped portion) that extends primarily between the elastic connector 11 and the knitting needle 2, and is partially arranged around the elastic connector 11 such that the portion 14 and the elastic connector 11 define an arcuate groove between them. This arcuate groove extends from the bottom of the recess 5 and surrounds the annular portion constituting the elastic connector 11 at approximately 220°-230°. The arcuate portion 14 has a height substantially corresponding to the depth of the recess 5. The edge of the portion 14 faces the bottom of the recess 5 and, as better shown below, defines a travel end 15. The travel end 15 is arranged between the elastic connector 11 and the knitting needle 2 along the main extension direction of the drive chain 3.

[0175] The radial outer edge 16 of the arc-shaped portion 14 is circular relative to the arc-shaped groove and relative to the open ring.

[0176] The first portion 9 extends primarily from the rotational pivot 8 toward the distal end 13 of the elastically deformable distal segment 12. Specifically, the first portion 9 includes a tapered portion 17 integrally formed with the arcuate portion 14 and extending from the resilient joint 11 toward the distal end 13. The tapered portion 17 has an outer edge relative to the groove 5, on which there is a first heel 18 and has an edge 19 facing the interior of the groove 5.

[0177] The flexible joint 11 is essentially a torsion spring, which allows the first part 9 to rotate elastically relative to the second part 10 within certain limits.

[0178] The oscillating arm 7 has a proximal end 20 that is partially circular and is housed within a resilient joint 11. The C-shaped resilient joint 11 partially surrounds the proximal end 20 of the oscillating arm 7, allowing the proximal end 20 to rotate within the resilient joint 11. Thus, the resilient joint 11, together with the proximal end 20, also defines the rotational pivot 8 of the aforementioned oscillating arm 7.

[0179] The swing arm 7 extends beyond the distal end 13 of the elastically deformable distal segment 12 of the second portion 10 and has an outer edge relative to the groove 5, on which there is at least one selection tooth 21 and a second heel 22. The second heel 22 is located at the distal end of the swing arm 7, and the selection tooth 21 is located between the tapered portion 17 and the second heel 22.

[0180] Along the main extension direction of the transmission chain 3, i.e., along the extension direction of the groove 5, the rotation pivot 8 of the transmission chain 3 is located between the needle 2 and the first heel 18, and is closer to the needle 2 (compared to the distance from the first heel 18 and the second heel 22). For example, given Y as the distance between the interaction area of ​​the needle 2 and the transmission chain 3 and the rotation pivot 8 (which coincides with the elastic joint 11), and given X as the distance between the elastic joint 11 and the first heel 18, the ratio of X / Y is greater than 1, for example, the ratio X / Y is between 2 and 5. Furthermore, given Z as the distance between the rotation pivot 8 and the second heel 22, the ratio of Z / X is greater than 1, for example, the ratio Z / X is between 2 and 6.

[0181] like Figures 2 to 5 As shown, the distal end 13 of the elastically deformable distal segment 12 of the second part 10 rests against the swing rod 7 and is configured to push the swing rod 7 (particularly the selection tooth 21 and the second heel 22) out of the groove 5, i.e. to push the swing rod 7 and hold it in the extraction position.

[0182] The selection tooth 21 is configured to interact with at least one arm 24 of the arm-type piezoelectric selection device 23. Figure 1 Four arm-type piezoelectric selectors 23 are shown, integrally mounted on the disk 1 and the actuating triangle. The arm-type piezoelectric selectors 23 are known in themselves and include an array of arms 24 extending from the front of the piezoelectric selector 23 and facing the needle holder plate, the radial groove 5, and the selection teeth 21 of the oscillating lever 7. One of these arms 24 is also... Figure 3 As shown in the image.

[0183] like Figure 1 As can be seen, the array of arms 24 of each piezoelectric selection device 23 comprises multiple arms 24 arranged along their respective common radial direction. Each arm 24 can swing (e.g., by piezoelectric control managed by the machine's control unit) between a first position and a second position about a corresponding axis perpendicular to the common radial direction. By said swinging, the arm 24 is moved to interact with or not interact with the selection teeth 21 of the swing lever 7.

[0184] The actuation triangle supported by the disk 1 includes a first actuation triangle 25 that defines a first path 26 and is configured to interact with a first heel 18, and a second actuation triangle 27 that defines a second path 28 and is configured to interact with a second heel 22.

[0185] The swing arm 7 and the second heel 22 rotate about the rotation pivot 8 and oscillate due to a combination of actions: the distal end 13 of the elastically deformable distal segment 12 pushes the swing arm 7 out of the groove 5; the piezoelectric selection device 23, together with the arm 24, pushes the swing arm 7 into the groove 5; and the second actuation triangle 27, which has a ramp also shaped to push and hold the swing arm 7 within the groove 5. As a result of these actions, the swing arm 7 oscillates between a retrieved position and an inactive position, wherein, in the retrieved position, the second heel 22 is removed from the corresponding groove 5 and engages with the second path 28 defined by the second actuation triangle 27; and in the inactive position, the second heel 22 is retracted into the corresponding groove 5 and thus does not engage with the second path 28.

[0186] Due to the combined action of the elastic force applied by the resilient joint 11, the first portion 9 of element 6 rotates relative to the second portion 10 on the resilient joint 11, causing the tapered portion 17 and the first heel 18 to move together in a direction pointing outwards from the groove 5 and the first actuation triangle 25. The resilient joint 11 is configured to leave a minimum clearance at the proximal end 20 of the swing arm 7 even when the resilient joint 11 is in its maximum torsional configuration. Therefore, this minimum operating clearance allows the rotation pivot 8 to rotate even when the resilient joint 11 reaches its maximum torsional state.

[0187] Figure 2 (Drive Chain 3 in Operation – “O” State / Configuration) Drive chain 3 is shown with the oscillating lever 7 in the extraction position. A surface of the second actuating triangle 27 faces the groove 5 to prevent the oscillating lever 7 from further disengaging from the groove 5, and the resiliently deformable distal segment 12 holds the oscillating lever 7 in this position by pushing the distal end of the oscillating lever 7 against the surface of the second actuating triangle 27 facing the groove 5. The distal end of the oscillating lever 7 slides relative to the second actuating triangle 27 due to the relative rotational movement of the needle holder 4 relative to the second actuating triangle 27. The first heel 18 is in an operating position protruding from the groove 5 and received in one of the first paths 26. The resilient joint 11 is in a substantially unloaded torsional state or in a preloaded state, i.e., tending to rotate counterclockwise (see...). Figure 2 The conical portion 17 is pushed so that it (due to the relative rotational movement of the needle holder plate 4 relative to the first actuation triangle 25) rests against the surface of the first actuation triangle 25 facing the groove 5 and slides, while the end of the stroke 15 rests against the bottom of the groove 5.

[0188] Figure 3 (The drive chain 3 with piezoelectric selector 23 in the selected "S" state / configuration) shows the drive chain 3 and the oscillating rod 7 in the retracted position due to the interaction between one arm 24 of the piezoelectric selector 23 and the selector tooth 21 of the oscillating rod 7. The first heel 18 is in contact with... Figure 2 The same operation location in the middle.

[0189] Figure 4 (The drive train 3 with the oscillating lever 7 embedded—“A” state / configuration) shows the drive train 3, in which the oscillating lever 7 is in the retracted position due to its interaction with one of the second actuation triangles 27. The oscillating lever 7 is connected to the piezoelectric selector 23 (e.g., Figure 2 The first heel 18 (as shown) is moved to the retracted position or is moved to the retracted position due to engagement with the inclined surface of one of the second actuating triangles 27, and is held in the retracted position by the second heel 22, which rests against and slides relative to the surface of the second actuating triangle 27 toward the groove 5. Figure 2 The same operation location in the middle.

[0190] Figure 13 and Figure 14 The transmission chain 3 (which schematically shows the corresponding first heel 18 and second heel 22) is shown as an example, respectively formed in the coil ( Figure 13 "Withdrawal" path) and stitch formation ( Figure 14 The corresponding path followed when performing an "operation" path. Figure 13 and 14 In the diagram, the letters "O", "S", and "A" associated with each position of transmission chain 3 indicate that transmission chain 3 is in the aforementioned and Figure 2 , Figure 3 and Figure 4 The conditions / configurations shown.

[0191] Figure 5 (Contact of the first heel 18 – “C” state / configuration) shows the situation where the transmission chain 3 interferes with one of the first actuation triangles 25, that is, if the first heel 18 does not properly follow the first path 26 defined by the first actuation triangle 25, but instead impacts the first actuation triangle 25 itself by contacting or sliding over it.

[0192] For example, such as Figure 15 As shown, if the second heel 22 of the swing arm 7 deviates from the corresponding (lifting) second actuation triangle 27 at approximately halfway through its lifting path due to a malfunction, then the first heel 18 does not correctly follow the upper and lower boundaries defined by the deflection triangle 29 belonging to the first actuation triangle 25. Figure 10The deflection triangle 29 is positioned below) one of the first paths 26, instead of striking the deflection triangle 29. The deflection triangle 29 (in...) Figure 10 and Figure 11 (As shown more clearly in the image) has a ramp 30 extending from the bottom surface of the first path 26. The first path 18 engages with and slides on the ramp 30. Figure 11 Therefore, the inclined plane 30 gradually pushes the first heel 18 into the corresponding groove 5, such as Figure 5 As shown.

[0193] Therefore, the presence of the ramp 30 avoids violent contact between the first heel 18 and the deflection triangle 29. Instead, the ramp 30 engages with and supports the first heel 18 when it returns to the groove 5.

[0194] The interaction between the ramp 30 and the first heel 18 results in the first part 9 of element 6 (operably connected to or to be connected to the corresponding needle 2) surrounding the rotation pivot 8. Figure 5 The rotation centers coincide (clockwise). The end of the stroke 15 leaves the bottom of its respective groove 5, and the edge 19 of the tapered portion 17 contacts the swing arm 7, pushing and holding it in a non-operating position, thus contrasting with the elastic action exerted by the elastically deformable distal segment 12. Even when the first portion 9 rotates relative to the second portion 10, the circular radial outer edge 16 does not protrude from the groove 5.

[0195] exist Figure 15 In the diagram, the letter "C" indicates that transmission chain 3 is in... Figure 5 The location under the "C" status / configuration.

[0196] Within the first useful space, that is, when it finds one of the first paths 26, the first heel 18, pushed by the elastic joint 11, leaves the groove 5 again and returns to one of the planned first paths 26 without damaging the transmission chain 3.

[0197] exist Figure 16 In the middle, the second heel 22 of the swing lever 7 follows the entire second actuation triangle 27 located further to the left, but then departs from the second actuation triangle 27 located further to the right at approximately halfway through its lifting path. The first heel 18 does not correctly follow the upper and lower boundaries defined by the slant triangle 29 belonging to the first actuation triangle 25. Figure 10 The deflection triangle 29 is positioned below. One of the first paths 26 is not the point of impact, but rather the point of impact with the deflection triangle 29. Similarly, the deflection triangle 29 (in...) Figure 10 and Figure 11 (As shown more clearly in the image) has a ramp 30 extending from the bottom surface of the first path 26. The first path 18 engages with and slides on the ramp 30. Figure 12 Therefore, the inclined plane 30 gradually pushes the first heel 18 into the corresponding groove 5, such as Figure 5 As shown.

[0198] Again, within the first useful space, i.e., when it finds one of the first paths 26, the first heel 18, pushed by the elastic joint 11, leaves the groove 5 again and returns to one of the planned first paths 26 without damaging the transmission chain 3.

[0199] Figure 17 It shows something similar to Figure 16 In the case of the first heel 18, the first heel 18 leaves the groove 5 again and returns to one of the first paths 26 in a different position.

[0200] Figure 6 , Figure 7 and Figure 8 It shows Figure 2 , Figure 3 , Figure 4 and Figure 5 A variant of the intermediate drive chain 3. This variant is configured to operate using a magnetic selector instead of the arm-type piezoelectric selector 23 as described above. Figure 6 , Figure 7 and Figure 8 The magnetic selection device 31 shown includes two magnets 32. Figure 6 , Figure 7 and Figure 8 Transmission chain 3 and Figure 2 , Figure 3 , Figure 4 and Figure 5 The difference is that the swing arm 7 does not have a selection tooth 21, but instead includes a distal segment 33 that extends beyond the second heel 22 and is configured to be elastically bent and interact with the two magnets 32.

[0201] Figure 6 The “O” status / configuration is shown, along with... Figure 2 Correspondingly, two magnets 32 are deactivated and do not attract the distal segment 33. Figure 7 The “S” status / configuration is shown, along with... Figure 3 Correspondingly, two magnets 32 are in an active state and the distal segment 33 is held to bend elastically and preload the distal segment 33 onto the magnet 32. Figure 8 The “C” status / configuration is shown, along with... Figure 5 Correspondingly, the distal segment 33 preloads the magnet 32, and... Figure 7 The same applies, and the first heel 18 is inserted into the groove 5.

[0202] Figure 8ATransmission chain 3 and Figure 6 , Figure 7 and Figure 8 The two are essentially the same, except that the distal segment 33 is rigid, meaning it does not bend when it is pushed against the magnet 32.

[0203] Figure 9A and Figure 9B Different embodiments of the transmission chain 3 are shown, which are related to Figure 2 , Figure 3 , Figure 4 and Figure 5 The main difference in the transmission chain is that the elastic joint 11 is a certain distance away from the rotating pivot 8. It can be seen that this embodiment has a selection tooth 21, and therefore structurally it can operate together with the aforementioned piezoelectric selection device 23.

[0204] The flexible joint 11 is located near the knitting needle 2, i.e., at the end of the drive chain 3, on the opposite side from the distal end of the swing rod 7 supporting the second heel 22. The flexible joint 11 connects the first part 9 to the second part 10 of the element 6 via a first curved segment 34 directly connected to the first part 9, a second curved segment 35 directly connected to the second part 10, and a straight segment 36 connecting the first curved segment 34 and the second curved segment 35. The first part 9 extends from the first curved segment 34, is substantially parallel to the flat rod-shaped segment 37 of the second part 10, and protrudes toward the rotational pivot 8. The rotational pivot 8 is located between the flat rod-shaped segment 37 and the elastically deformable distal segment 12 of the second part 10. The rotational pivot 8 is located approximately half the length of the drive chain 3.

[0205] So far, the drive chain 3 according to the invention has been described in detail along with the corresponding knitting needle 2 and with reference to the needle holder plate, although the invention can be applied to any loop forming component (e.g., knitting needle, sinker, punch, spring, or hook). For example, Figure 18 , Figure 21 and Figure 22 A settling plate 38 is shown. Figure 19 A hook 39 is shown.

[0206] This invention can also be applied to any support (e.g., plate, cylinder, or crown) of a circular knitting machine having a groove 5 (accommodating the drive chain 3 and the coil forming member). The groove 5 of the cylinder is generally parallel to the central axis "XX" of the machine, while the groove in the plate or crown is radial relative to the central axis "XX". In addition to cylinders with axial grooves, the support can also be defined as a roller with inclined grooves 5.

[0207] In the embodiments described in detail here, the actuation triangles are fixed, i.e., they belong to a fixed disk, while the needle holder rotates due to the action of a motor. In variations falling within embodiments of the invention, the support with the groove 5 is fixed, while the actuation triangles rotate about a central axis by a motor.

[0208] Furthermore, so far, the coil forming component, i.e., the knitting needle 2, has been disclosed as a separate component connected to element 6 of the drive chain 3. Additionally, Figure 18 Settling plates and Figure 19 The hook is also separate from the drive chain 3.

[0209] In variations of the embodiments, the coil forming components (needles, sinkers, hooks, punches, etc.) may also be integrally formed with the element 6; in other words, the drive chain 3 includes the coil forming components.

[0210] For example, Figure 20 The diagram shows a knitting needle 2 integrated into a drive chain 3. The knitting needle 2 is integrally formed with an element 6 having a first heel 18 and extends continuously from an arcuate portion 14. The knitting needle 2 and the first portion 9 are rigidly connected. In the event of interference with one of the first actuation triangles 25 and rotation of the first portion 9, the knitting needle 2 also rotates with the first portion 9. However, the angle of rotation is limited, thus preventing the knitting needle 2 from interfering with other parts of the machine.

[0211] On the contrary, Figure 21 and Figure 22 The settling plate 38 is connected to the element 6 having the first heel portion 18 by a yielding, elastic connector 40 (i.e., a thin, flat portion integral with the settling plate 2 and the drive chain 3). The connector 40 extends along the groove 5 between the arcuate portion 14 and the settling plate 38.

[0212] The yielding connector 40 can transmit axial force, i.e., in the same direction as the groove 5, without deformation, so that the transmission chain 3 and the settling plate 38 can move axially as a whole.

[0213] The yielding connector 40 is also configured to allow the first portion 9 to rotate relative to the second portion 10 while the settling plate 38 remains aligned with the corresponding groove (i.e., it does not tilt). Figure 22 As shown, when the first part 9 rotates, the yielding connector 40 bends in the radial plane, thus forming a wave, while the settling plate 38 remains in place (i.e., it does not tilt).

[0214] In a variation of the embodiment, the coil forming member has a hook for engaging with the drive chain 3, and can be unhooked if needed. For example, Figure 23 and Figure 24 Variations of the illustrated embodiments are similar to Figures 2 to 5 The embodiment shown has a distance greater than that between the arcuate portion 14 and the elastic joint 11. Figures 2 to 5 The illustrated embodiment is sized such that the end of the travel 15 defines a hook that engages with a base 41 defined by a corresponding hook in the needle 2. Figure 24 In the middle, knitting needle 2 is hooked to drive chain 3. For example... Figure 23 As shown, when the first heel 18 contacts and the first part 9 of element 6 rotates, the knitting needle 2 disengages from the transmission chain 3 and does not rotate (as shown). Figure 20 (The knitting needles in the two parts are different).

[0215] In a variation of the embodiment, the swing arm 7 is not hinged to the element 6 having the first heel 18, but is instead elastically connected to the element 6 on an auxiliary resilient joint 42 so that it can swing under any circumstances. For example, Figures 25 to 28 The transmission chain 3 in the example embodiment is similar to Figures 2 to 5 The transmission chain shown is different from the latter in that the swing arm 7 is connected to the second part 10 instead of to the elastically deformable distal segment 12, and the elastically deformable distal segment 12 does not exist.

[0216] The second part 10, the auxiliary elastic joint 42, and the swing rod 7 are integrally formed. The proximal segment of the swing rod 7, ending at the auxiliary elastic joint 42, is inclined relative to the second part 10. The auxiliary elastic joint 42 connects the swing rod 7 to one end of the second part 10. Due to the elastic bending of the auxiliary elastic joint 42, the swing rod 7 in the operating position ( Figure 25 and 26 ) and non-operational positions ( Figure 27 and 28 It oscillates between ). In this exemplary embodiment, with Figure 2 Figure 5 The transmission chain 3 can be configured such that the first heel 18 returns to the groove 5 and the second heel 22 is in its operating position. Figure 26 This is because even when the first part 9 rotates, the edge 19 does not contact the swing lever 7 and cannot push it and keep it in the non-operating position.

[0217] Figure 29 Another embodiment of the transmission chain 3 is shown, which is related to Figure 2 , Figure 3 , Figure 4 and Figure 5The difference in the transmission chain is that the swing arm 7 is connected to the element 6 via an auxiliary elastic joint 42 located on the elastic joint 11. The proximal end of the swing arm 7 is integrally formed with the elastic joint 11; in other words, the elastic joint 11 and the auxiliary elastic joint 42 are coupled together, and the swing of the swing arm 7 is achieved by the elastic deformation of the auxiliary elastic joint 42. Figure 29 In the middle, the proximal end of the swing rod 7 is located inside the C-shaped or open annular ring.

Claims

1. A drive chain for loop-forming members of a circular knitting machine, characterized in that, include: - Element (6), combined with a coil forming member, or operably connected to a coil forming member, or to be connected to a coil forming member; The element (6) has a first heel (18) configured to engage in a first path (26) defined by a first actuation triangle (25) of a circular knitting machine; - The swing rod (7) is connected to the element (6) in the engagement area and extends on the opposite side of the coil forming member relative to the element (6); the swing rod (7) has a second heel (22). The swing arm (7) is configured to interact with at least one selection device (23, 31) of the circular knitting machine to swing relative to the element (6) between a take-up position and a retracted position. In the take-up position, the second heel (22) is taken out from the corresponding groove (5) of the support of the circular knitting machine and engages with the second path (28) defined by the second actuation triangle (27). In the retracted position, the second heel (22) is retracted into the corresponding groove (5) and thus does not engage with the second path (28). The element (6) having the first heel (18) includes a first part (9) that carries the first heel (18) and a second part (10) configured to slide in connection with the bottom of the corresponding groove (5). The first part (9) is elastically connected to the second part (10) to hold the first heel (18) in an operating position where the first heel (18) protrudes from the groove (5) and to allow the first heel (18) to return to the groove (5) in the event of interference with one of the first actuation triangles (25).

2. The transmission chain according to claim 1, characterized in that The element (6) having a first heel (18) includes an elastic joint (11) connecting the first part (9) to the second part (10) such that the first part (9) can be elastically rotated relative to the second part (10); wherein the elastic joint (11) is a torsion spring.

3. The transmission chain according to claim 2, characterized in that The flexible joint (11) is placed corresponding to the mating area.

4. The transmission chain according to claim 2, characterized in that, The swing arm (7) is hinged to the element (6) on a rotational pivot (8) located in the engagement area; wherein the resilient joint (11) defines the rotational pivot (8); wherein the rotational pivot (8) coincides with the rotational center of the first part (9) relative to the second part (10).

5. The transmission chain according to claim 2, characterized in that, The flexible joint (11) is C-shaped or open annular.

6. The transmission chain according to any one of claims 1 to 5, characterized in that, Along the main extension direction of the transmission chain (3), the engagement area is placed between the coil forming member and the first heel (18).

7. The transmission chain according to any one of claims 1 to 5, characterized in that, The first part (9) extends mainly from the engagement area to the second heel (22) and has an edge (19) facing the swing rod (7); wherein the edge (19) is configured to engage with the swing rod (7) when the first heel (18) returns to the groove (5) and move the swing rod (7) to the retracted position.

8. The transmission chain according to claim 2, 3, or 4, characterized in that, The first part (9) includes a stroke end (15) arranged along the main extension direction of the transmission chain (3) between the elastic joint (11) and the coil forming member; wherein, when the first heel (18) is in the operating position, the stroke end (15) rests against the bottom of the corresponding groove (5), and when the first heel (18) returns to the groove (5), the stroke end (15) leaves the bottom of the corresponding groove (5).

9. The transmission chain according to claim 8, characterized in that, The first part (9) includes a portion (14) arranged along the main extension direction of the transmission chain (3) between the resilient joint (11) and the coil forming member; the portion (14) has a height corresponding to the depth of the groove (5); wherein the portion (14) has a radially outer edge (16) that is rounded so that it never protrudes from the groove (5) even when the first part (9) rotates relative to the second part (10); wherein the portion (14) is arc-shaped and partially arranged around the resilient joint (11).

10. The transmission chain according to claim 9, characterized in that, The portion (14) includes the end of the stroke (15).

11. The transmission chain according to any one of claims 1 to 5, characterized in that, The oscillating rod (7) has at least one selection tooth (21) configured to interact with at least one arm (24) of the arm-type piezoelectric selection device (23); or wherein the oscillating rod (7) has a distal segment (33) configured to interact with the magnetic selection device (31).

12. A circular knitting machine, characterized in that, include: The support member has a plurality of grooves (5) arranged around the central axis (XX) of the support member; Multiple coil forming components, each coil forming component being at least partially accommodated in a corresponding groove (5); The first actuation triangle (25) and the second actuation triangle (27) facing the groove (5); The support member can move about the central axis (XX) relative to the first actuating triangle (25) and the second actuating triangle (27), thereby determining or causing the coil forming member to move along the groove (5) to form a coil through the coil forming member; Multiple drive chains (3), each drive chain (3) performing according to claim 1, is accommodated in a corresponding groove (5) and combined with a coil forming member, or is operably connected to a coil forming member, or will be connected to a coil forming member; At least one selection device (23, 31) interacts with the transmission chain (3).

13. The circular knitting machine according to claim 12, characterized in that, The first moving triangle (25) includes at least one deflection triangle (29) configured to interact with the first heel (18) and guide it to one or the other of the first paths (26); wherein the deflection triangle (29) has a ramp (30) configured to gradually push the first heel (18) into the groove (5) in the event of interference with the deflection triangle (29).

14. The circular knitting machine according to claim 12 or 13, characterized in that, The at least one selection device is an arm-type piezoelectric selection device (23) and interacts with the selection teeth (21) carried by the sway bar (7) of the drive chain (3); or the at least one selection device is a magnetic selection device (31) and interacts with the distal segment (33) of the sway bar (7) of the drive chain (3) configured for elastic bending.

15. The circular knitting machine according to claim 12 or 13, characterized in that, The coil forming member incorporated into the drive chain (3), or the coil forming member operably connected to the drive chain (3), or the coil forming member to be connected to the drive chain (3), is a knitting needle (2), or a sinker, or a punch, or a spring, or a hook.

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