Patent Application
20230295851
The disclosure and figures made in U.S. Provisional Patent Application No. 63/321,944, filed Mar. 21, 2022, are specifically incorporated by reference herein as if set forth in its entirety.
The present disclosure relates to tufting machines, and more particularly to tufting machine needle drive systems for driving one or more needle bars of tufting machines to enable increased operational speeds, improved maintenance efficiencies, and other improvements.
The use of tufting machines for creating tufted articles, for example tufted carpets, is well-known in the art. Conventional tufting machines can have drive systems for driving reciprocation of a needle bar carrying a plurality of needles into and out of a backing material passing transversely underneath the needle bar. As the needles penetrate the backing material, they carry yarns into the backing material, where upon the yarns are caught by a looper to create a loop pile tufts, or by a hook or level cut loop looper and cut with a knife to create cut pile tufts. Typically, as a main drive shaft of the tufting machine rotates, the needle bar is reciprocated toward and away from the backing material. Such drive systems can however, have drawbacks in terms of serviceability. For example, some drive systems utilize a series of individual drive assemblies mounted along the tufting machine and tied to the main drive shaft of the tufting machine, and also may include belt driven gear arrangements that drive push rods coupled to the needle bar for reciprocating the needle bar. However, when the belts of such drive assemblies wear out and/or break so as to require replacement, the entire drive system often must be substantially disassembled to enable access to the belts. In addition, the operational speeds of many conventional tufting machine drive systems often are limited, particularly for cut pile tufting machines.
What is needed, therefore, is an improved drive system for tufting machines that addresses the foregoing and other related and unrelated issues in the art. These include, but are not limited to needle drive systems for driving reciprocation of the needles of cut pile tufting machines at operational speeds similar to those of loop pile machines, and needle drive systems which provide for a durable and rugged apparatus that is efficient and easy to maintain.
Briefly described, the present disclosure generally relates to tufting machines and methods of tufting. In embodiments, such tufting machine(s) can include a drive system for driving reciprocation of one or more needle bars thereof, and configured to provide improvements in driving the reciprocation of the one or more needle bars to form tufts of yarns in a backing material at increased production rates. The drive systems can be used for the formation of loop pile tufts, cut pile tufts, and/or combinations thereof, wherein production rates for tufted articles formed with cut pile tufts can be substantially matched to production rates for similarly formed tufted articles formed with loop pile tufts. Such tufted articles can include, for example and without limitation, carpets, artificial turf, and other tufted articles or materials.
In embodiments, the tufting machine can include one or more needle bars having a series of needles mounted therealong. The needles can be arranged in in-line, staggered, or in other arrangements along the one or more needle bars. A backing material can be fed through a tufting zone of the tufting machine with the needles penetrating into and out of the backing material with the reciprocation of the needle bars by the drive system. Yarns can be introduced into the backing material as the needles are reciprocated into and out of the backing material. In some embodiments, a shift mechanism can be provided for shifting the one or more needle bars transversely across the tufting zone. In other embodiments, multiple shift mechanisms can be utilized as needed.
The tufting machine further generally can include at least one yarn feed mechanism or pattern attachment for controlling the feeding of the yarns to their respective needles. In embodiments, such a yarn feed mechanism or pattern attachment can include, without limitation, various roll, scroll, servo-scroll, single end, double end, or multiple end yarn feed attachments. For example, in embodiments, a Yarntronics™, Infinity™ or Infinity IIE™ yarn feed mechanism or pattern attachment is manufactured by Card-Monroe Corp. Other types of yarn feed mechanisms can also be used.
In embodiments, the shift mechanism(s) and at least one yarn feed mechanism or pattern attachment generally can communicate with a control system of the tufting machine. For example, the shift mechanism(s) can receive instructions or communications from a control system for the tufting machine, for stepping or shifting the at least one needle bar transversely across the backing material in accordance with programmed and/or designed pattern shift steps for a pattern being tufted, so as to present the yarns carried thereby to tuft or stitch locations along/across the backing. In embodiments, the at least one yarn feed mechanism also can be operated to selectively control feeding of yarns to their associated needles for forming tufts of yarns, which can include forming tufts having selected pile heights and/or forming no tufts, to create the desired pattern appearance.
In addition, the tufting machine can include a gauge part assembly mounted below the backing, which in embodiments, can comprise a series of gauge parts that can include, for example and without limitation, loop pile loopers, cut pile hooks, level cut loop loopers, cut/loop clips, knives, etc. The gauge parts can be reciprocated into engagement with the needles as the needles penetrate the backing material to pick loops of yarns therefrom. In embodiments, a height or location of the gauge parts below the backing material, and, in some embodiments, the stroke or penetration depth of the needles through the backing, can be varied, in addition to adjusting the stroke or penetration depth of the needles through the backing material, to form varying loops of yarns of varying pile heights in the backing material, including formation of different pile height loops. Yarn feed control also can be used to control pile heights, for example, by pulling loops of yarns substantially low or out of the backing. In embodiments, various configurations and/or combinations of loop pile loopers, cut pile hooks, cut/loop hooks, level cut loopers or hooks, and/or other gauge parts can also be used.
In embodiments, the drive system for driving reciprocation of the needles of the tufting machine can include spaced first and second drive shafts disposed within the head of the tufting machine, the drive shafts extending generally parallel to each other along the head of the tufting machine and transversely across the backing material being fed through the tufting machine. The first and second drive shafts can include exposed ends that project through side plates at opposing sides of the tufting machine frame, the exposed ends being located outside the frame, projecting away from exterior surfaces of the side plates. In embodiments, the exposed ends of the first and second drive shafts include shaft drive gears mounted thereto and are coupled to a motor drive gear, sheave or sprocket of one or more main motors for driving the first and second drive shafts.
The drive system further can include a series of needle stroke or drive assemblies located along the head of the tufting machines, with the drive shafts extending therethrough. In embodiments, each of the needle stroke assemblies can include a series of needle stroke drive gears connected to and driven by drive members linked to the drive shafts. In embodiments, the drive members can include chains driven by alternating ones of the drive shafts such that the needle stroke drive gears of alternating ones of the needle stroke assemblies, e.g., odd number needle stroke assemblies can be rotated in one direction of rotation, while even number needle stroke assemblies can be rotated in an opposite direction. By rotating the drive shafts in opposite directions, a series of connecting rods, which can connect the needle stroke drive gears to a series of push rods coupled to the at least one needle bar are driven in a generally vertical direction or path of movement so as to translate the rotary motion of the first and second drive shafts to the push rods for driving the push rods in a linear, reciprocating motion, and the opposing rotational directions can allow the weight of the connecting rods to substantially counter-balance such motion and, in embodiments, the opposing rotations of the first and second drive shafts. In embodiments, counter-weights also can be mounted on the first and second drive shafts to help balance and reduce/control vibration of the drive system as the needles are reciprocated into and out of the backing material.
In embodiments, the drive members of each of the needle stroke assemblies can be configured as double strand roller chains, which can include two paired rows or strands extending in a looped path about a first needle stroke drive gear attached to one of the drive shafts and about a second needle stroke drive gear attached to a secondary drive shaft. Other drive members also can be used.
In embodiments, the secondary shaft further can be coupled to a connecting rod so as to drive the connecting rod in an up and down motion with the rotation of the crank shaft. For example, in some embodiments, the secondary drive shaft can have a series of cam members mounted thereto in an offset arrangement, and with the cam members being coupled to the connecting rods for driving the reciprocating movement of the connecting rod and thus the push rod and the needle bar. In some embodiments, the secondary drive shaft can comprise a crank shaft coupled to the connecting rods for driving the reciprocating motion thereof. In addition, in embodiments, the drive chains can be configured to increase shaft horsepower and for easier repair and/or replacement without requiring removal of the first and second drive shafts from the needle stroke assemblies.
In embodiments, the drive system further can include a drive belt configured to encircle a motor drive gear mounted to the motor shaft of the one or more drive motors and shaft drive gears mounted to the ends of the drive shafts of the drive system, extending thereabout in a serpentine path. In embodiments, the drive belt and motor drive gear and drive shaft gears can comprise a high torque drive arrangement configured to enable the motors to drive the first and second drive shafts with increase horsepower and torque. The drive gears and drive belt further are mounted externally of the tufting machine, e.g., outside of an end box and along an exterior surface(s) of the tufting machine, further providing ease of maintenance. As the motor drive gears are driven by the motors, the drive belt drives the shaft drive gears, causing the first drive shaft to rotate in one direction and the second drive shaft to rotate in a reverse or opposite direction to the first drive shaft.
In embodiments, the drive belt can comprise a toothed timing belt having a series of spaced teeth, which, in embodiments, will include a series of curvilinear teeth. In some embodiments, the drive belt can comprise a double-sided curvilinear toothed timing belt. In other embodiments, the drive belt can comprise a double sided high torque belt having a series of teeth spaced therealong, which, in embodiments, can include a plurality of curvilinear teeth.
In embodiments, the drive belt can be extended around a tension adjusting gear located on an adjustable support. The adjustable support can be moveable along the side plate of the frame to which it is attached so as to move the tension adjusting gear with respect to the drive belt and adjust a tension therein, e.g. to take up slack in the drive belt.
In some aspects of the disclosure, a tufting machine is provided comprising: a frame having a base, spaced side portions, an end box, and a head extending between the side portions; at least one needle bar having a plurality of spaced needles mounted therealong, the needles carrying a plurality of yarns; wherein the at least one needle bar is moved in a reciprocating motion toward and away from the backing material as the backing material is moving through the tufting machine such that the needles penetrate the backing material to form tufts of the yarns in the backing material; and a drive system. In embodiments, the drive system comprises at least one motor mounted along at least one of the sides of the frame and having a motor drive shaft with a motor gear coupled thereto; first and second drive shafts extending along the head of the tufting machine, each of the first and second drive shafts having exposed ends that extend through the sides of the frame so as to project away from exterior surfaces of the frame; and a plurality of needle stroke assemblies located within the head of the frame and arranged at spaced positions along the first and second drive shafts, each needle stroke assembly comprising a plurality of needle stroke drive gears. The plurality of needle stroke drive gears can include a series of first needle stroke drive gears coupled to and driven by one of the first or second drive shafts, and a series of second needle stroke drive gears coupled to and driven by the first needle stroke gears by drive members. Rotation of the first and second drive shafts can cause rotation of the needle stroke drive gears of alternating needles stroke assemblies in opposite directions. A plurality of push rods can be coupled to the at least one needle bar and to the needle stroke drive gears for translating the rotation of the first and second drive shafts to a linear reciprocating motion of the at least one needle bar. The drive system further can comprise first and second shaft drive gears mounted to the exposed ends of the first and second drive shafts, the first and second drive gears located along an exterior surface of the side portion of the frame and outside of the end box of the frame; a tension adjusting gear located along the exterior surface of the side portion of the frame; a drive belt extending about the motor drive gear, the first and second shaft drive gears, and the tension adjusting gear; and an adjustable support on which the tension adjusting gear is mounted, the support configured to move along the exterior surface of the side portion of the frame to adjust a position of the tension adjusting gear with respect to the first and second drive gears to maintain a selected tension in the drive belt.
In embodiments of the tufting machine, the drive members comprise double strand size #60 roller chains. In some embodiments, the needle stroke assemblies each further comprise a mounting platform attached to the head of the frame and through which the drive shafts are extended.
In some embodiments of the tufting machine, the first needle stroke drive gears can be coupled to the first and second drive shafts in an alternating arrangement. For example, in embodiments, a first needle stroke drive gear of one of the needle stroke assemblies can be coupled to the first drive shaft, and a next first needle stroke drive gear of a next needle stroke assembly can be coupled to the second drive shaft in an alternating arrangement.
In some embodiments of the tufting machine, the drive belt comprises a double-sided modified curvilinear toothed timing belt. In embodiments, the drive belt comprises a width of at least about 2 inches to about 4 inches.
In embodiments of the tufting machine, the drive members comprise double strand roller chains each having a master connecting link configured to be removable from the double strand roller chains to enable removal of the drive members from the needle stroke drive gears.
In some embodiments, the tufting machine further comprises a plurality of gauge parts located below the backing material and configured to engage the needles and pull loops of yarns therefrom. In embodiments, the gauge parts can comprise cut pile hooks and knives for forming cut pile tufts of yarns in the backing material. In some embodiments, the gauge parts can comprise hooks, loopers, level cut loop looper or combinators thereof.
In some embodiments, an operational speed of the tufting machine for forming cut pile tufts can be at least approximately 1800 RPM.
In addition, in embodiments, the drive belt comprises a double-sided modified curvilinear toothed timing belt having a width of at least about 2 inches, and in embodiments, can include a poly-chain drive belt.
The present disclosure thus provides a tufting machine and a drive system for a tufting machine that enables operational speeds at increased rates, including operation of a tufting machine for forming cut pile tufts at similar operational speeds to loop pile tufting machines. In embodiments, the drive system further can be configured such that worn parts of the drive system can be readily and easily replaced and in which the driving and timing mechanism can be readily adjusted.
Various other objects, features and advantages of the present disclosure will become apparent from the following description when considered in conjunction with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views.
The accompanying drawings, which are included to provide a further understanding of the embodiments of the present disclosure, are incorporated in and constitute a part of this specification, illustrate embodiments of this disclosure, and together with the detailed description, serve to explain the principles of the embodiments discussed herein. No attempt is made to show structural details of this disclosure in more detail than may be necessary for a fundamental understanding of the exemplary embodiments discussed herein and the various ways in which they may be practiced. Those skilled in the art further will appreciate and understand that, according to common practice, the various features of the drawings discussed below are not necessarily drawn to scale, and that the dimensions of various features and elements of the drawings may be expanded or reduced to more clearly illustrate the embodiments of the present disclosure described herein.
Referring now in detail to the embodiment chosen for the purpose of illustrating the present disclosure,
Such tufts or stitches can be formed with various patterns, including having a multi-pile height tufted appearance. For example, the tufted article can be formed with the tufts of yarns formed at varying pile heights to provide sculptured looks, and with different color or type yarns for formation of multi-color patterns of various geometric and/or free-flowing designs. Additionally, it will be understood that various numbers of different type and/or color yarns (i.e., two color, three color, five color, six color, etc.), can be used to form multiple pile height patterned tufted articles according to the principles of the present disclosure.
As illustrated in
As indicated in
The at least one needle bar 30 further can be shiftable transversely across the width of the backing material, so as to shift or step the needles 31 in a direction that is transverse or generally perpendicular to the longitudinal path of travel 6 through the tufting machine. For example, a shift mechanism also can be linked to the one or more needle bars for shifting the at least one needle bar transversely across the backing material. The shift mechanism can include a Smart Step™ type shifter as manufactured by Card-Monroe Corp., or alternatively can include various other types of shift mechanisms including servo-motor or hydraulically controlled shifters, and/or pattern cam shifters as are conventionally used. Additional shift mechanisms including backing material or jute shifters, operable separately or in conjunction with a needle bar shifter, for shifting the backing material laterally with respect to the needles also can be used.
In embodiments, the needles 31 can be arranged in a single in-line row along one or more needle bars 30. In other embodiments, the needles 31 can be mounted in a staggered arrangement along a single needle bar or along a pair of needle bars, with offset rows of needles spaced transversely along the length of each needle bar and being staggered across the tufting zone of the tufting machine. Accordingly, while one example embodiment including a single needle bar 30 with an inline row of needles 31 arranged therealong may be generally indicated in
Each of the needles generally will include a shank or body terminating at a pointed end, and including a take-off point or area where gauge parts 35 (
It will be understood by those skilled in the art that in various embodiments, the gauge parts 35 can include loopers, hooks, level cut loop loopers, knives and other types of gauge parts. For example, in the present embodiment, the gauge parts can include a series of cut pile hooks and knives for forming cut pile tufts in the backing material. Other gauge parts, including loop pile loopers and level cut loop loopers, also can be used, such as to form loop pile tufts, and/or loop and cut pile tufts, loop pile loopers.
The gauge parts generally are disposed below the bed plate and are reciprocated toward and away from the needles for engaging and picking-up yarns inserted through the backing material (not shown), as the needles penetrate the backing material. The gauge parts further can be located at a fixed height to protrude through the loops sewn by the needles when the needles are at approximately bottom dead center and catch and temporarily hold the loops of yarns.
For example, the gauge parts 35 can be mounted below the bed of the tufting machine 10, spaced at a desired or selected distance to engage the needles 31 at a selected needle stroke or penetration depth. As the needles 31 penetrate the backing material, they are engaged by the gauge parts 35 of the gauge part assembly so as to pick-up and form loops of the yarns Y for forming tufts of yarns of selected colors or types in the backing material, and with selected lengths or pile heights.
In embodiments, at least some of the gauge parts 35 also can be slidably mounted within a gauge module, gauge block or other holder that can be mounted along a gauge bar or similar mount or attachment that couples the gauge parts to a drive mechanism for driving a reciprocating movement of the gauge parts in a direction toward and away from the needles. It further will be understood by those skilled in the art that various types of gauge parts, including cut pile hooks, loop pile loopers, level cut loop loopers, cut/loop clips or other gauge parts also can be used.
One or more yarn feed mechanisms or pattern attachments 40 (
In embodiments, other pattern yarn feed mechanisms or attachments having multiple yarn feed drives, each of which can include a motor and a feed roll for feeding yarns to selected needles, including the use of individual yarn feed devices for controlling the feeding of single yarns (or ends) or multiple ends of yarns (i.e., 2-4 or more yarns) to the needles 31, such as shown in
The tufting machine further generally will include a control system configured for controlling the operation of the tufting machine 10, including control of the backing feed, control of the feeding of the yarns by the yarn feed attachment or mechanism, control of the driving/operating speed of a main drive shaft, e.g. one or more motor drive shafts 45 (
In embodiments, the control system generally can comprise a tufting machine controller including a computer/processor or system controller and an operator interface, such as a touch screen, keyboard, mouse, etc., through which the operator can input patterns, make adjustments, etc. In some embodiments, the control system can comprise or include a stitch distribution control system, with the controller of the control system further including programming for control methodology for forming tufted patterns, including sculptured patterns having tufts formed at multiple pile heights, multi-color patterns, etc. In addition, one or more encoders, motor controls, and/or other, similar sensors adapted to monitor the rotation of the motor drive shafts and report the position(s) of the motor drive shafts to the control system can be provided for control of the operation of the tufting machine 10.
As illustrated in
In embodiments, the motors can be mounted on opposite sides of the frame of the tufting machine and, as shown, can be mounted on support plates or platforms 19 attached to the upper portion 18 of the tufting machine frame at each side 16 thereof, as indicated in
As illustrated in
In embodiments, shaft drive gears 49 are mounted to each of the exposed ends 26A/26B of the first and second drive shafts, as indicated in
In embodiments, each of the needle stroke assembly is 28 can includes a generally L-shaped frame 51 including a base portion 52 mounted to the head 14 of the tufting machine frame 11, such as by bolts or other fasteners, and an upstanding shaft support section 53. Each of the shaft support sections 53 generally can include the bearings or bushings 54 located adjacent a lower end of each shaft support section, and through which the first and second drive shafts 25A/25B are extended as shown in
Secondary drive shafts 56 or stud shafts can be rotatably received and project through each shaft support section 53 by bearings or bushings 57 mounted within the shaft support sections adjacent the upper ends 53A thereof. In embodiments, the secondary drive shafts will include a proximal end 58 protruding through the shaft support sections in a first direction and attached to a rotary cam member 59, and a distal end 61 that projects in an opposite direction through the support section and is engaged in rotatably supported by bearings 62 of a stub shaft support 63 formed with or attached to the supporting framework 51.
In embodiments, each needle stroke assembly 28 can further include a plurality or set of needle stroke drive gears 70. For example, in some embodiments, the needle stroke drive gears can include a first needle stroke drive gear 71 of the needle stroke drive gears of each needle stroke assembly 28 can be mounted along one of the first or second drive shafts 25A/25B, and a second needle stroke drive gear 72 that can be mounted to the secondary drive shaft 56 adjacent the proximal end thereof. In embodiments, the rotary cam member 59 further can be connected to the secondary drive shaft 56, such as shown in
In embodiments, as shown in
In addition to providing or enabling significant increases in horsepower for driving reciprocation of the at least one needle bar, the drive chains further can be configured to facilitate efficiencies in maintenance and repair of the drive system 5 by enabling the drive chains to be detached and easily removed for repair and/or replacement of the drive chains, needle stroke drive gears, secondary drive shafts and/or other components of the needle stroke assemblies 28, but without requiring removal of the first and/or second drive shafts 25A/25B.
In embodiments, the drive members 75, for example, drive chains, belts or other, similar drive members, will be sized and configured to handle increases in horsepower (HP) up to approximately two to three times that of a conventional cut pile tufting machine. For example, in embodiments, the drive members can have a horsepower rating sufficient to withstand increases in horsepower driving rotation of the first and second drive shafts of the needle drive system from 30 HP to approximately 60 HP to upwards of 90 HP.
Enabling the use of drive members configured to accommodate such increases in horsepower in turn can enable the drive system to drive at least one needle bar 30 at increased speeds. For example, in embodiments featuring a cut pile tufting machine, the drive system 5 can be operable to drive reciprocation of at least one needle bar at the speeds approximately equivalent to speed obtainable with loop pile tufting machines, e.g. speeds of up to about 1500 rpm to about 2000 rpm, In embodiments, speeds of 1500 rpm to 1900 rpm, 1500 rpm to 1800 rpm, 1500 rpm to 1700 rpm, 1500 rpm to 1600 rpm, 1600 rpm to 2000 rpm, 1600 rpm to 1900 rpm, 1600 rpm to 1800 rpm, 1600 rpm to 1700 rpm, 1700 rpm to 2000 rpm, 1700 rpm to 1900 rpm, 1700 rpm to 1800 rpm, 1800 rpm to 2000 rpm, 1800 rpm to 1900 rpm, and 1900 rpm to 2000 rpm can be achieved, although greater speeds can also be anticipated.
As further indicated in
In embodiments, each of the needle stroke assemblies 28 further can include a cam arm 80 having a first or upper end attached to the rotary cam member 59, and a second, distal end connected by a connecting rod 81 to one of the push rods 33; the push rods 33 being connected to at least one needle bar 30. As the first and second drive shafts 25A/25B are rotated, their rotation is translated via the needle stroke drive gears and drive members of each of the needle stroke assemblies to the secondary drive shafts 56 of each needle stroke assembly, which in turn rotates the rotary cam members 59 attached thereto. As the rotary cam members 59 are driven with the rotation of the first and second drive shafts 25A/25B, the cam arms 80 are driven in a reciprocating, up and down linear motion. This up and down motion is translated via the connecting rods 81 to the push rods 33, which can be coupled to at least one needle bar 30 by support bracket or foot 82, such that at least one needle bar is caused to reciprocate up and down in the direction of arrows 32 and 32′ for reciprocating the needles 31 carried by at least one needle bar 30 into and out of the backing material B passing there below.
As indicated in
In embodiments, the drive belt 85 generally can comprise a double-sided modified curvilinear toothed timing belt, which, in some embodiments, can include a poly-chain belt. In embodiments, the drive belt can have an expanded width of approximately 3-4 inches; and in some embodiments, can have a width of approximately 2 inches to 6 inches, 2 inches to 5 inches, 2 inches to 4 inches, 2 inches to 3 inches, 3 inches to 6 inches, 3 inches to 5 inches, 4 inches to 6 inches, 4 inches to 5 inches, and 5 inches to 6 inches. Other widths can also be used.
In addition, in embodiments, the drive belt can comprise a toothed timing belt having a series of spaced teeth, which, in embodiments, will include a series of curvilinear teeth. In some embodiments, the drive belt can comprise a double-sided curvilinear toothed timing belt. In other embodiments, the drive belt can comprise a double sided high torque belt having a series of teeth spaced therealong, which, in embodiments, can include a plurality of curvilinear teeth.
As indicated in
As additionally indicated and illustrated in
In embodiments, the support 91 is adjustable or moveable in a vertically up and down direction along the side plate 17 of the tufting machine frame to enable adjustments in tension applied to the drive belt, e.g., to remove or take-up slack in the drive belt that may be created during operation of the drive belt over time. In embodiments, the support 91 can be mounted along a slide, a track, on rails 92, and/or other guide members such as indicated in
The drive belt 85 communicates or translates the rotation of the motor drive shaft 48 to the shaft drive gears 49 so as to rotate each of the first and second drive shafts in a synchronized, opposite reversing direction. As the first and second drive shafts 25A/25B are rotated, the drive members 75 of each of the needle stroke assemblies 28 translate such rotation to the secondary drive shafts 56, which in turn drive an eccentric movement of the cam arms 80 attached to the rotary cam members 59 such that the cam arms are moved in a reciprocating, up and down movement. In embodiments, timing of the movement of each of the cam arms can be arranged such that movement of the cam arms of each of the needle stroke assemblies can stop at a top dead center position approximately the same time and at bottom dead center at approximately the same time.
In addition, in some embodiments, the connecting rods 81 or push rods 33 that couple the cam arms 80 to the at least one needle bar 30 can be substituted so as to position the needle bar at prescribed location with respect to the backing material, in order to enable variations of the depth of penetration or stroke of the needles 31 into the backing material, without necessarily varying height of the bed plate. Alternatively, in embodiments, the bedplate and/or the gauge parts can be moveable to enable adjustments in the pile heights of the tufting of yarns formed in the backing material.
In general, the timing of the stroke of the alternately arranged cam arms 80 and connecting rods 81 of the needle stroke assemblies 28 can be selected to be approximately 180° out of phase with each other so that the needles 31 are fully raised as cam arms are at top dead center, and are fully lowered when the cam arms are at bottom dead center. The counter-rotating drive shafts 25A/25B thus rotate the secondary drive shafts 56 of the alternate needle stroke assemblies in counter-rotating directions so that the eccentric mountings of the cam arms to the rotary cam members drive cam arms and thus the connecting rods and push rods coupled thereto, in a synchronized, dynamically counter-balanced motion during the movement of the needle bar 30 in an upward/downward direction.
To further provide for dynamic counter-balancing, in some embodiments, the first and second drive shafts 25A/25B can provided with counter-balance weights 95 (
In embodiments, the counter-balance weights 95 can include one or more pairs of opposed, rectangular clamp blocks 96, which can grip the first and second drive shafts 25A/25B from opposing sides so as to circumscribe and clamp the counter-balance weights 95 to the first and second drive shafts. The outer surfaces of the clamp blocks also can be configured to receive or attach to appropriate size offset weights. In embodiments, the counter-balanced weights can be disposed adjacent the cam arms 80 and connecting rods 81 respectively, and can be arranged in about a 180° out of phase relationship to each other.
By such an arrangement, the tufting machine 10 of the present disclosure can be substantially balanced during operation, and configured so that the tufting machine (including cut pile tufting machines) to operate at speeds that are generally equivalent to operational speeds of loop pile tufting machines. In embodiments, a cut pile tufting machine can be provided that can operate at speeds of 1,500 RPM-2,000 RPM or greater.
The tufting machine of the present disclosure further exhibits little vibration transmitted to the floor on which the machine 10 is mounted and/or which is transmitted to any yarn feed mechanism which might be associated with the machine. Furthermore, the noise of the machine is reduced so that the effect on the environment, when the machine 10 is running, is not as great as with the prior art machines.
In addition to the embodiments described above, embodiments of the present disclosure further relate to one or more of the following examples of embodiments of drive systems according to the principles of the present disclosure, which can include various embodiments features or elements and/or combinations of features steps or elements as disclosed herein. The following disclosed Examples further are not to be taken as limiting the scope of the present disclosure and any of the embodiments.
The tufting machine of Example 1 of paragraph [0072], wherein the drive belt comprises a double sided curvilinear toothed timing belt.
The tufting machine of Example 1 of paragraph [0072], wherein the drive members comprise double strand drive chains each having at least one connecting link configured to be disengaged so as to enable removal of the drive chains from about the needle stroke drive gears and respective push rod gears.
The tufting machine of Example 1 of paragraph [0072], further comprising a plurality of gauge parts located below the backing material and configured to engage the needles and pick-up loops of yarns therefrom.
The tufting machine of Example 1 of paragraph [0075], wherein the gauge parts comprise cut pile hooks and knives for forming cut pile tufts of yarns in the backing material.
The tufting machine of Example 1 of paragraph [0076], wherein an operational speed of the tufting machine for forming cut pile tufts is at least approximately 1800 RPM.
The tufting machine of Example 1 of paragraph [0072], wherein the drive belt comprises a poly-chain double sided curvilinear toothed timing belt having a width of between at least about 2 inches and about 6 inches.
The tufting machine of Example 1 of paragraph [0072], wherein each needle stroke assembly further comprises a frame attached to the head of the machine frame, a pair of lower bearings through which the first and second drive shafts are received, and at least one upper bearing through which the secondary drive shaft is received.
The tufting machine of Example 2 of paragraph [0080], further comprising one or more counter-balance weights attached to at least one of the first and second drive shafts, wherein the counter-balance weights are configured to substantially dampen vertical forces due to the reciprocating motion of the at least one needle bar.
The tufting machine of Example 2 of paragraph [0080], wherein the drive members each include at least one connecting link configured to be disengaged so as to enable removal of the drive members from about the needle stroke drive gears and respective push rod gears.
The tufting machine of Example 2 of paragraph [0080], wherein the gauge parts comprise cut pile hooks and knives for forming cut pile tufts of yarns in the backing material.
The tufting machine of Example 2 of paragraph [0080], wherein an operational speed of the tufting machine for forming cut pile tufts in the backing material is at least approximately 1800 RPM.
The tufting machine of Example 2 of paragraph [0080], wherein the drive belt comprises a poly-chain double sided modified curvilinear toothed timing belt having a width of between at least about 2 inches and about 5 inches.
The tufting machine of Example 3 of paragraph [0086], the drive system further comprising a secondary drive shaft coupled to at least one of the first needle stroke drive gear and the second needle stroke drive gear such that the secondary drive shaft is caused to rotate with rotation of the first and second drive shafts.
The tufting machine of Example 3 of paragraph [0086], wherein the needle stroke assemblies further comprise a plurality of needle stroke drive gears, including a first drive needle stroke gear coupled to one of the first and second drive shafts, and a second needle stroke drive gear coupled to a secondary drive shaft; wherein the drive members extend about and link the first and second needle stroke drive gears.
The tufting machine of Example 3 of paragraph [0086], further comprising first and second drive gears mount to the exposed ends of the first and second drive shafts, and wherein the drive belt is extended about the first and second drive gears in a substantially serpentine path such that the first and second drive shafts rotate in opposite directions.
The tufting machine of Example 3 of paragraph [0086], further comprising one or more counter-balance weights attached to at least one of the first and second drive shafts, the counter-balance weights configured to substantially dampen vertical forces due to the reciprocating motion of the at least one needle bar.
The tufting machine of Example 3 of paragraph [0090], the one or more counter-balance weights comprising one or more pairs of opposed, rectangular clamp blocks positioned to grip the first and second drive shafts from opposing sides.
In the drawings and specification, embodiments of drive systems for driving a needle bar or multiple needle bars of a tufting machine have been disclosed, and although specific terms are employed, such terms are used in a descriptive sense only and not for purposes of limitation. In addition, while embodiments of the drive systems and methods of operation thereof have been described in detail with specific reference to the illustrated embodiments, it will, however, be understood by those skilled in the art that various changes and modifications can be made to the above-discussed construction of the present disclosure without departing from the spirit and scope of the present disclosure as disclosed herein, and that it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as being illustrative, and not to be taken in a limiting sense.
Furthermore, the scope of the present disclosure shall be construed to cover various modifications, combinations, additions, alterations, etc., to the above-described embodiments, which shall be considered to be within the scope of the present disclosure. Accordingly, various features and characteristics of the present disclosure as discussed herein may be selectively interchanged and applied to other illustrated and non-illustrated embodiments of the present disclosure, and numerous variations, modifications, and additions further can be made thereto without departing from the spirit and scope of the present disclosure as set forth in the appended claims.
The present Patent application claims the benefit of pending U.S. Provisional Patent Application No. 63/321,944, filed Mar. 21, 2022.
| Number | Date | Country | |
|---|---|---|---|
| 63321944 | Mar 2022 | US |
