Francesco Lonati has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: A knitwork drawing device which has a hollow piston rod movable axially through one of the needle cylinders in a double cylinder circular knitting machine, and a knitwork retaining member arranged at the height of the stitch-formation area and rotatable with the needle cylinders. The hollow piston rod is secured to a fluid-operated piston slidable in a cylindrical chamber coaxial with the needle cylinders. Tensioning of the knitwork is effected by leaving the hollow piston rod to rest on the knitwork being knitted, which is held at its initial portion by the retaining member internally of the hollow piston rod and by the needles which continue to knit externally of the hollow piston rod. The whole stroke of the piston and hollow piston rod is thus the half of the whole length of the knitwork and the axial dimension of the knitting machine is considerably reduced.
Abstract: A yarn feed unit for a single-cylinder circular knitting machine comprises a plurality of yarn feeding fingers independently journalled to a common axis and independently movable between an inoperative and an operative position. The axis is supported by a carrier body which is radially displaceable with respect to the needle cylinder between a work position close to the needle cylinder and a rest position remote from the needle cylinder. Movement of the carrier body from the work position to the rest position causes the operative yarn feeding fingers to be simultaneously tilted into the inoperative position and all the yarn feeding fingers to be radially withdrawn from the needle cylinder, thus allowing rotation of the needle cylinder and needle dial to set the machine without any risk of damaging the needles and without manually handling the dial needles.
Abstract: To blow a yarn toward the needles and release it from the gripping device upon yarn feeding in a circular knitting machine, in particular a double cylinder one, a device is provided which is synchronized with each yarn feeding finger regardless of the number of feeds. The device comprises a control cam provided with a boss and rotated synchronically with the needle cylinder(s), an actuating cam provided with two oppositely located notches and connected to the control cam through a normally disengaged coupling controlled by the machine program, and an actuating lever which follows the profile of the actuating cam and controls a valve to cause it to engage with the control cam and be operated by the boss thereof to deliver pressurized air to the yarn feeding area. The valve can be moved into the operative position by means of each yarn feeding finger associated with one feed.
Abstract: Machine for knitting a tubular fabric, in particular stocking articles, comprising a needle cylinder, a cylinder holder, a dial, suction and discharge ducts for the produced tubular fabric and means for driving the cylinder holder. A shaft extends coaxially through the needle cylinder and the cylinder holder and is affixed to the dial. A tube-like body is mounted coaxially within the cylinder holder wherewith it rotates. The tube-like body is displaceable axially in the cylinder holder from a position whereat it is coupled directly to and made rigid for rotation with the shaft, to a position whereat it forms with the shaft at least one annular passage for communication with the suction and discharge ducts for the produced tubular fabric. A control member is provided of essentially lever-like configuration for axially displacing the tube-like body.
Abstract: The device for changing the number of the needles knitting in a circular knitting machine for stockings and like articles, comprises a single picker configurated for operation in either directions of reciprocation of the needle cylinder or cylinders and arranged at that area where a conventional needle lowering picker is arranged. The single picker is rotatable through 180.degree. substantially about the longitudinal axis thereof for assuming respectively a position in which it operates as a needle raising picker and a position in which it operates as a needle lowering picker.
Abstract: A circular knitting machine in which for switching from continuous rotary motion to reciprocating motion and vice versa there is provided a coupling member rotatively rigid with a shaft and axially displaceable between two pinions, idly arranged on the shaft. One pinion is constantly reciprocated by a reciprocable toothed sector, while the other pinion is constantly rotated. The coupling member is alternately engageable with a respective one of the pinions, so as to cause the shaft, which is operatively connected to the needle cylinder(s), to reciprocate or rotate. A control lever is pivoted to the stationary structure of the machine and has one end slideably engaging the coupling member and the other end slideably engaging two rotatable cams, which provide angular displacement of the control lever to cause axial displacement of the coupling member. The cams can be uncoupled from a cam driving shaft rotated by the main drive of the machine.
Abstract: A control device for striper units in a circular knitting machine having a plurality of cam disks, the profil whereof is followed by a respective lever operating a respective thread finger by means of a Bowden cable. Each cam disk is secured to a respective toothed wheel meshing with a further toothed wheel which may be coupled with and uncoupled from, a drive shaft constantly rotating with a predetermined rotational speed. Coupling and uncoupling of the further toothed wheel is controlled by the main chain of the machine so as to selectively cause a rotation of substantially 180.degree. of a respective selected cam disk to bring the corresponding thread finger in operation and another rotation of substantially 180.degree. to bring the corresponding thread finger out of operation. Other cam disks are provided to control in the same manner corresponding thread cutting and gripping means each time an associated thread finger is controlled.
Abstract: A double-cylinder circular knitting machine with latch needles and a device for automatically causing the latches of the needles operating in the upper needle cylinder to open before knitting. The device comprises cams defining a path for the needle-free sliders of the lower needle cylinder which lies constantly all around the cam box at a level corresponding to that at which the tips of the sliders engage the latches of the rib needles to open them. The needle-free sliders are selectively passed into this path and are subsequently returned into the normal knitting path when knitting plain fabric. The arrangement of the continuous path at a constant level all around the needle cylinder allows a more simple configuration of the latchguard cams and less wear and stresses in the needle latches.
Abstract: A method for knitting a garment on a double-cylinder circular knitting machine, comprising the steps of withdrawing the stitch sinkers firstly with only the yarn taken up by the lower cylinder needles, subsequently lowering the upper cylinder needles to pick up the yarn while causing the stitch sinkers to outwardly project and to pick up the yarn taken by the upper cylinder needles, and raising the lower cylinder needles only after the sinkers have been withdrawn. There is also disclosed a double-cylinder circular knitting machine in which the cams for controlling the sinkers have a notch in a position substantially vertically below the lowering cam which controls lowering of the upper cylinder needles to take up the yarn, the notch being arranged before the raising cam controlling raising of the lower cylinder needles for taking up the yarn.
Abstract: For advancing the main drum in a circular knitting machine there is provided a device comprising a ratchet wheel rigid with the drum and having five rows of teeth axially spaced thereon. Five pawls are movable back and forth for engagement with the teeth of a respective row. A primary pawl can be disengaged from the ratchet wheel under control of the main chain, and four secondary pawls reciprocate in regular succession so as to perform two back and forth movements in the span of two revolutions of the needle cylinder(s). The secondary pawls have a front end wider than the axial width of the teeth. Between the rows of teeth there are arcuate members having a circumferential length depending on the knitting program and a height such as to disengage the pawls from the respective teeth. The arcuate members may be easily replaced to provide further advancing sequences for the main drum.
Abstract: For stepwise advancing a pattern drum in a circular knitting machine there is provided a device comprising a peripheral tooth formation on the pattern drum, a pawl capable of engaging the tooth formation and pivotally supported on a support which is caused to swing at each revolution of the needle cylinder under the action of a cam rigid with the needle cylinder. The cam has a first radially increasing part extending preferably for a half of a circle, a following second radially increasing part considerably steeper than the first part, and a progressively radially decreasing part. The cam causes the pawl to advance the pattern drum by two steps. When the pattern drum is to be advanced by a single step the pawl is disengaged from the tooth formation by an angle lever which is controlled by control pegs arranged on the pattern drum according to a control pattern.
Abstract: A circular knitting machine having tiltable pattern jacks, intermediate jacks thereon and needles over the intermediate jacks, the pattern jacks having lower butts for being raised and lowered by substantially triangular cams rigid with a cam ring. The lowering portion of the cams has a curvilinear portion joining the lowering portion and having a radius of curvature which is smaller than the ideal radius of connection between the lowering portion and the horizontal portion of the cam ring between the cams. The curvilinear portion remains at a distance from a base plane of the cam ring substantially corresponding to the distance between the lower face of the lower butt of the pattern jacks and the lower face of the pattern jacks. The curvilinear portion is followed by a further descending portion.
Abstract: There is disclosed a method of manufacturing patterned knitted fabrics on a double cylinder knitting machine, in which the pattern jacks associated with needles in the lower needle cylinder having already picked up a yarn at any of the feeds but one thereof are brought into a position in which they can no longer be selected to bring the associated needles to knit in the same knitting course. Same occurs for the jacks associated with the needles knitting in the upper needle cylinder. All these jacks are then brought into a position capable of being raised on the jack raising cam associated with the remaining feed, but only those jacks are raised which are associated with needles knitting in the upper needle cylinder. The machine has a number of jack selecting devices which is by one unit smaller than the number of yarn feeds, and cams for causing the jacks to move as above described.
Abstract: There is disclosed a yarn cutting and gripping device of the type including a plurality of strip-like elements lengthwise movable adjacent a fixed blade and having a hooked end for cutting the yarn in cooperation with the fixed blade. The strip-like elements are resiliently urged against the fixed blade by a block arranged at the side of the strip-like elements opposite to the fixed blade. Each element has a lug extending below the hooked end substantially parallel thereto and recessed with respect to the cutting plane so as to seize the yarn and cause it to form a loop about this lug before and after being cut by the hooked end, thus increasing the retaining force of the cut yarn. The strip-like elements may be formed by two parallel parts, the one having the hooked end and the other the projecting lug.
Abstract: There is disclosed a circular knitting machine of the type including an upper and a lower needle cylinder and comprising a safety device for opening the latches of the double-hooked needles which are to be transferred from one needle cylinder to the other one. For this purpose the machine includes an auxiliary cam located upstream of the zone at which transfer of the needles occurs, the cam being arranged and shaped so as to bring all the sliders and corresponding needles movable along a floating track to a height in which the needle hook and corresponding latch contact the tip of the corresponding slider of the opposite needle cylinder, thus causing the latch to open by interaction between the needle and the tip of the slider. The machine also includes a subsequent cam for raising to a needle transfer position the sliders whose needles are to be transferred to the other needle cylinder and for newly lowering into the floating track the sliders whose needles are not to be transferred.
Abstract: A method for manufacturing seamless panty hose having two tubular legs knitted by continuously rotating the needle cylinder and a panty portion between the legs knitted by reciprocatingly operating the needle cylinder. During manufacturing of the central part of the panty portion a number of adjacent needles is inactivated at the end of each stroke of reciprocation and the last of the working needles are controlled to form a knit selvage edge at the sides of the inactivated group of needles extending longitudinally with respect to the knitted fabric, the opposite selvage edges being spaced by an extent corresponding to the extent of the arc of the needle cylinder occupied by the inactivated needles. The number of inactivated needles is such as to define between the two opposite selvage edges a rectangular waist opening having proportioned sides.
Abstract: A circular knitting machine for stockings, particularly for the manufacture of stockings closed at the toe directly on the machine, having a coupling joint for disengaging the lower needle cylinder from the upper needle cylinder or from the welt dial. The coupling joint consists of a substantially flanged element rigid with the shaft driving the lower needle cylinder and of a gear wheel mounted idly and axially displaceable on the shaft. The gear wheel engages with a corresponding crown gear for rotation of the upper needle cylinder or the welt dial. The flanged element and the gear wheel have means for mutual engagement and the machine further comprises means for the axial displacement of the gear wheel to disengage it from the flanged element, these means being responsive to the machine program.
January 31, 1975
Date of Patent:
July 20, 1976
Costruzioni Meccaniche Lonati di Lonati Francesco & Figli (Ettore, Faust, Tiberio) S.n.c.
Abstract: Improvements in or relating to the drive cam ring sets for the needles, cam followers and the like on circular knitting machines. The cams are divided into units, each of the cam units being formed on a discrete rigid plate. The individual plates having a plurality of cams thereon are in turn attachable on a rigid skirt surrounding the needle cylinder.
January 2, 1974
Date of Patent:
April 27, 1976
Costruzioni Meccaniche Lonati di Lonati Francesco & Figli (Ettore, Fausto, Tiberio) S.n.c.