US3846996A - Mechanism for actuating pattern or control drums in knitting machines, and knitting machines incorporating the same - Google Patents

Mechanism for actuating pattern or control drums in knitting machines, and knitting machines incorporating the same Download PDF

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Publication number
US3846996A
US3846996A US00258490A US25849072A US3846996A US 3846996 A US3846996 A US 3846996A US 00258490 A US00258490 A US 00258490A US 25849072 A US25849072 A US 25849072A US 3846996 A US3846996 A US 3846996A
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cam
pair
driving
driven
cams
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US00258490A
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J Comas
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • D04B15/665—Driving-gear for programme or pattern devices

Definitions

  • ABSTRACT A cylindrical knitting machine has pattern control drums actuated by respective cam followers, themselves actuated by driven cams rigidly set in a carriage moveable axially of the cylinder. By virtue of the construction of the carriage and the setting of the cams in it only one cam follower can be actuated at any one time. Movement of the carriage is caused through a positive drive mechanism by radial movement of a carriage having driving cams. Only one of these may be engaged at any one time by an actuator disc, of which the axial position is adjustable by a lever linkage for which the control is a chain driven by movement of the cylinder, the chain having stops of different heights.
  • the actuator disc According to the height of the stop sensed by the lever linkage the actuator disc is set axially, causing a corresponding radial set of the driving cam carriage and hence a corresponding axial set of the driven cam carriage.
  • This has five positions, a neutral or non-driving position and two on each side of that: the chain has stops of five heights and there are five driving cams.
  • Various types of knitting machines have pattern or control drums actuated step-by-step, selectively and in opposite directions by advancing means actuated by pairs of cams carried on a portion of the machine which cams for actuating the advancing means function independently, so that it is possible that mechanical failure in any portion of the assembly may cause the simultaneous actuation of both cams; since the advancing means are generally pawl or ratchet devices operating drums are located at different levels, so that they are between the travel paths of both limbs in a central position of the cam member.
  • the inner flanks of the said limbs are formed with cam tracks having-different radial heights and diverging outwardly, so that the displacement of the cam member in the one or other direction from the central position couples one of the tracks of the flanks thereof with a single one of the followers.
  • the driving cams are constitutedby two arms which are radially separated and the inner flanks of which carry cams stepped or shouldered in opposite directions, having entry ramps at the same side and which, on rotation, pass on both sides of a disc-like actuatingmeans displaceable by control means for coupling with each pair of cams which are radially opposite each other relative to the cylinder.
  • the negative steps or shoulders separatingeach two ramps of one arm surround the positive steps or shoulders separating each of the ramps of the opposite arm, with an axial separation corresponding to the thickness of the actuating means.
  • the two aforementioned slides are provided with rack teeth with which mesh transmission gears.
  • the said gears may comprise, for example, a toothed wheel for each rack, and both wheels are fast in rotation and are of different diametenfor amplifying oppositely on one and the same escapement wheel, it
  • the invention overcomes this disadvantage due to the fact that both the driving cams and the driven cams are arranged, rigidly and with no possibility for relative movement, in individual rigid units interconnected by motion transmission; the driving and the driven cams are arranged in their respective units in such manner that, when co-operating with the associated follower and actuating means, there is no possibility of the latter being simultaneously coupled with two opposed cams of each set.
  • the invention is, more specifically, applicable to circular machines comprising a'bed and a needle cylinder rotatable on the said bed, a station for supplying positional data, secured at a location thereof, a series of pattern or control drums secured on the bed about the cylinder, and mechanical memory means rotatable on the cylinder for transferring the positional data from the station for supplying the same to the various drums.
  • the memory means comprise a slider displaceable parallel to the axis of the cylinder and carrying the control cam unit, and a slider which is radially displaceable relative to the said axis and carries the driving cam unit; both slides are interconnected by means of the mechanism for transmitting the positional data from the driving cams to the driven cams, preferably this mechanism being a rack and pinion for each slider, the pinions being constrained to rotate together.
  • the driven cams are constituted, preferably, by a U- shaped member the limbs or arms of which are located at different positions along the axial direction of the cylinder, and the two opposite drive followers of the the displacement of the drive cams.
  • the disc-like. actuating means may be itself I actuated, by a single control chain having stops of varying heights, the heights being equal in number to the sum of the drive cam tracks.
  • FIG. 3 is an elevation in section approximately on the line III III of FIG. 1,
  • FIG. 4 is a bottom plan view of the mechanism, as-
  • FIG. 5 is an elevational view of the mechanism for actuating the said control means
  • FIG. 6 is a lateral-view showing means for advancin the pattern drum.
  • FIG. 7 is a plan section of the previous Figure.
  • Reference numeral 1 designates the fixed ring of the machine, on which are mounted, inter alia, the pattern drums and the means for step-wise actuation thereof (described later with reference to FIGS. 6 and 7). Of these FIG. 1 shows only the actuating cam followers 2 and 3, provided with contact rollers 4.
  • Reference numeral S designates a further fixed ring on the machine, constituting the circular slide means 6 on which rotates the mounting 7 for the cylinder, shown partly at 8 and having the schematically illustrated axis 8'.
  • the various drum mechanisms Mounted on the ring I, about the cylinder, are the various drum mechanisms, and the mounting 7 carries the mechanism for actuating the followers and the positional memory which is driven at a location on the periphery of the cylinder by the disc-like control means 9 actuated by the mechanism to be described with reference to FIG. 5.
  • a dovetail slide 14 disposed vertically, for a carriage or slider 15 the cross-section of which is of dovetail shape and which, furthermore, is displaceable parallel to the axis of the cylinder.
  • the upper end of the slider 15 has secured on its face directed outwardly of the machine, by means of screws 16 and centering pins 17, a steel block 18 of U-shape disposed in such manner that the two arms of limbs 19 thereof are vertically. spaced apart.
  • the edges of the said limbs are profiled in the form of ramps ascending in the direction of displacement of the mechanism relative to the followers 2 and 3 (arrow 20,
  • FIG. 2 so that they constitute earns 21 and 22, the I distance 28'(FIG. 1) between the free faces of the contact rollers 4.
  • the carriage described has five functional positions comprising: two end positions, shown in solid and broken lines in FIG. 1, in each one of which one of the rollers 4 will be moved by the cams 21 and 22; a central inoperative position wherein both rollers 4 will pass between the two faces 23,'and two in termediate positions between the latter and the first two, in each one of which one of the rollers4 will be moved by one of the cams 25 and .26.
  • the unit 18 does not actuate any of its followers 2 and 3, so that the drum mechanisms actuated thereby remain in that position in which they initially were; at each one of the positions located above the inoperative position, one of the cams 22 or 26 actuates the roller of the follower 3 in corresponding separate travel paths; in each one of the positionslower than the inoperative position the follower 2 is actuated with two separate travel paths.
  • the pattern drum mechanism shown in FIGS. 6 and 7 may be actuated optionally in one or other direction and with advance of one or two teeth towards each side, as is conventional in this type of machine.
  • the lower portion of the slide 15 has a longitudinal toothed rack 29 with which permanently meshes a corresponding pinion 30 secured by means of the key 31 on a lateral neck 32a having a pinion of smaller diameter 32 free to rotate on the fixed pivot 33 (FIG. 3).
  • a locking screw 34 in opposite walls of a support 35 of box-structure, adapted to be secured in position by means of screws extending through the orifices 36.
  • the lower face of the said support 35 has a longitudinal portion (radial relative to the machine cylinder in the assembled position) which is turned-down rectangularly in such manner that, together with the straight edges 37 secured by the screws 38, it constitutes a slideway 39 for a further carriage or slider 40.
  • a plate 41 which has a mounting base strip 44; the upper edge of the said plate has rack toothing 45 permanently meshing with the pinion 32.
  • the lower face of the slider 40 has secured to it fo adjustment longitudinally, i.e. radially relative to the machine, a cam unit or group, designated by the general reference numeral 52, comprising a base plate 53 to which are secured, by means of screws 54 and 55 and centering pins 56, two earns 57 and 58 arranged to travel to both sides of the control disc 9 (as shown in FIG. 1); the base plate is secured to the 40 by means of screws 59 extending through orifices 60.
  • the inner face of the cam 57 has five shoulders 61 to 65 all extending from the same radial position relative to the machine cylinder, on the front side of the cam device.
  • the said shoulders or steps constitute cams in the manner of inclined ramps terminating in crests 61a to 65a, the radial distances of which are those required for communicating to the slider 40 and hence to the carriage 15 any one of the five positions mentioned hereinabove. Froma comparison of FIG. 1 and 5 it will be appreciated that the said cams have radial dimensions which increase upwardly.
  • the inner face of the cam 58 has a further five shoulders 67 to 71, also extending from the side from which the disc 9 is received in the device 52 and forming ramps of increasing height, terminating in crests 67a to 71a; in this case, however, the height of the said crests decreases upwardly and the assembly is so dimensioned as to obtain a radial position or height of the said crests such that there is between every two crests of the same level on I both earns 57 and 58 a constant distance corresponding to the diameter of the disc 9.
  • the disc 9 is disposed between the crests 65a and 71a, maintaining the cam device 52 displaced to the maximum extent towards the right, so that the carriage 15 is in its lowermost position for the form of actuation involving the longer travel path of the follower 2; on upwardly displacing the disc 9, by means to be described later, the cam device 52 will be displaced step-by-step towards the left and the cam unit 18 will ascend through the other positions until it reaches the end, shown in broken lines.
  • the disc 9 (FIG. 5) rotates at the upper end of a vertical spindle 74 displaceable in a fixed guide 75, and the lower end of which has an adjustable stop 76 through the agency of which it bears-on one of the ends of a rocker 77 oscillating on a pivot 78, secured to a general support 79 forming a part of the machine structure. The opposite end of the.
  • rocker is connected to one ofthe ends of a further rocker 80, also oscillating on a pivot 81 secured to the support 79, through the agency of a link rod of adjustable length, having the general reference numeral 82 and constituted by a rod 83 of hexagonal section having two threaded end portions 84 coupled to associated tapped nuts 85, constituting the articulation heads of the rockers; a nut 86 screwed to one of the portions, permits thesecuring of the desired position of adjustment.
  • a link rod of adjustable length having the general reference numeral 82 and constituted by a rod 83 of hexagonal section having two threaded end portions 84 coupled to associated tapped nuts 85, constituting the articulation heads of the rockers; a nut 86 screwed to one of the portions, permits thesecuring of the desired position of adjustment.
  • the other arm of the rocker forms a chain provided with the contact roller 87 bearing on a control chain 88 passing over the chain wheel 89.
  • This chain is regulated by interposing between its normal of standard links further links provided with stops 90which may have five different heights according to the five operating positions to be adopted, during the functioning of the machine, by the previously described-mechanism, so that the length and arrangement of the chain will always depend on the nature of the operation for which the machine is prepared.
  • the sprocket wheel 89 rotates on a pivot 91 carrying a ratchetwheel 92 actuated step-by-step, forexample at each turn of the machine cylinder, bymeans of a cam 93 secured inconventional manner to one of the parts fastwith the said cylinder.
  • the general support 79 has secured to it, by -means of screws 94, two box structures 95 constituting a guideway for a bar 96 freely displaceable for longitudinal movement.
  • One of the ends of the said bar has secured to it a pivot 97 for a contact roller 98 which is urged radially outwardly relative to the machine, to be actuated by the cam 93, for actuating a spring 99 tensioned between the posts 100 and 101 secured respectively to the bar and to one of the guide box structures; its rest position is determined by a stop 102 secured by means of the screw 103 to the general support and against which is applied the stud 104 secured to the bar 96.
  • Secured at the other end of the said bar by means of screws 105 is a mounting 107 provided with a pivot 108 on which oscillates the pawl 109 for actuating the wheel 92.
  • the two cam followers 2 and 3 which are longitudinally slidable, are guided in associated slideways 110 formed in a base 111 secured by screws 112 on the fixed ring 1.
  • Rotatable above the said base by conventional means is the shaft 113 for a pattern drum 114 provided for example with replaceable patternjack sinkers 115 and on which are also secured two ratchet wheels 116, 117 the teeth of which are oriented in opposite directions.
  • the outer end of the base 111 has two pivots 118 and two posts 119, which are vertically secured and the other ends of which are fast with a stay plate 120 by means of the nuts 121.
  • the two pivots serve for the pivoting of associated sleeves 122 and 123 each of which has a radial arm 124 and 125 located at predetermined levels and provided with adjustable stops 126 bymeans of which they take up the thrust of the end of a follower 2 or 3 respectively; externally of the said sleeves project arms 127 and 128'located at a further two separate levels and the ends of which terminate in articularf tion pivots 129 for associated pawls 130 and 131 apside.
  • each pawl bears, in the inoperative position (lower portion of FIG. 7), against the adjacent post 119'so as to keep the said pawl separate from its wheel, in order not to impede actuation in the opposite direction by the further pawl.
  • the pattern drum will be displaced by the amount of one or two teeth towards the appropriate
  • the parts 2 and-3 and 'the'elements which cooperate therewith form a pair of carn follower means operatively connected with the pattern drum means 114 for turning the latter in one direction or' the other depending upon which of these cam follower means is actuated by the driven cam means 1'8 which includes, in accordancewith the invention, the pair of cam portions 19 which are fixed with respect to each other and located apart from each other by a distance sufficiently great to prevent any-possible simultaneous actuation of both of the cam follower means 2 and 3.
  • This driven cam means 18 is displaced by way of the carriage 15 and the rack-and-pinion' transmission described above to one of the above five positions for determining which of the cam follower means will be moved and the extent to which it will be moved, in response to positioning of the driving cam means 52 to one of its five possible positions referred to above by way of the positioning means which is formed by the cam disc 9.
  • This positioning means 9 of course has also five possible positions for respectively determining the position of the driving cam means 52, and the positions of the positioning means 9 are determined by the detecting means 80,82, 77 (FIG.
  • said driven cam means has a pari of opposed end positions at one of which one of said cam portions actuates one of said cam follower means and at the other of which the other of said cam portions actuates the other of said cam follower means, and said pair of cam follower means respectively having free ends aligned with a space defined between said cam portions when said driven cam means is between said end positions thereof.
  • each of said cam portions has a air of camming surfaces for respectively moving a cam follower means through different increments of movement and said driven cam means having four positions which include said pair of opposed end positions and two additional positions adjacent said pair of opposed end positions so that depending upon the position of said driven cam means, said drum means willbe turned in one direction or the other through one of a pair of different increments.
  • said transmission means includes a pair of carriages respectively connected operatively with said driven and driving cam means, said carriages being movable in mutually perpendicular directions, and said transmission means including a pair of racks respectively fixed to said carriages, and a pair of pinions fixed to each other and respectively meshing with said-racks, so that in accordance with the diameters of said pinions a given transmission ratio willbe provided between said driving cam means and said driven cam means.
  • said driving cam'means includes two sets of radially spaced stepped cams which are respectively stepped in opposite directions and which define between themselves a space inwhich said positioning means is received during rotary movement of said driving cam means, and the pair of stepped cams having with respect to each other a space which will provide for engagement of one or the other of-stepped cams by said positioning means in order to displace said driving cam means radially to a given position.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US00258490A 1971-06-08 1972-06-01 Mechanism for actuating pattern or control drums in knitting machines, and knitting machines incorporating the same Expired - Lifetime US3846996A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES392471A ES392471A1 (es) 1971-06-08 1971-06-08 Mecanismo para el accionamiento de tambores de dibujo o control en maquinas tricotadoras.

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US3846996A true US3846996A (en) 1974-11-12

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US00258490A Expired - Lifetime US3846996A (en) 1971-06-08 1972-06-01 Mechanism for actuating pattern or control drums in knitting machines, and knitting machines incorporating the same

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US (1) US3846996A (enExample)
DE (1) DE2227182A1 (enExample)
ES (1) ES392471A1 (enExample)
FR (1) FR2140471B1 (enExample)
IT (1) IT956163B (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973415A (en) * 1973-12-22 1976-08-10 Wildt Mellor Bromley Limited Pattern mechanism
US3975925A (en) * 1973-08-30 1976-08-24 Nuova San Giorgio S.P.A. Apparatus for positioning needle selecting cylinders in a circular knitting machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2025463A (en) * 1934-04-17 1935-12-24 Lombardi Knitting Machine Co I Knitting machine
US3289437A (en) * 1964-04-27 1966-12-06 Singer Co Pattern drum indexing for circular knitting machines
US3587253A (en) * 1968-10-29 1971-06-28 Jumberca Sa Circular knitting machines
US3630050A (en) * 1970-04-01 1971-12-28 North American Rockwell Patern mechanism for knitting machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2025463A (en) * 1934-04-17 1935-12-24 Lombardi Knitting Machine Co I Knitting machine
US3289437A (en) * 1964-04-27 1966-12-06 Singer Co Pattern drum indexing for circular knitting machines
US3587253A (en) * 1968-10-29 1971-06-28 Jumberca Sa Circular knitting machines
US3630050A (en) * 1970-04-01 1971-12-28 North American Rockwell Patern mechanism for knitting machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975925A (en) * 1973-08-30 1976-08-24 Nuova San Giorgio S.P.A. Apparatus for positioning needle selecting cylinders in a circular knitting machine
US3973415A (en) * 1973-12-22 1976-08-10 Wildt Mellor Bromley Limited Pattern mechanism

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Publication number Publication date
ES392471A1 (es) 1974-07-01
FR2140471B1 (enExample) 1973-07-13
FR2140471A1 (enExample) 1973-01-19
IT956163B (it) 1973-10-10
DE2227182A1 (de) 1972-12-21

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