US3807199A - Stop motion device for flat knitting machines - Google Patents

Stop motion device for flat knitting machines Download PDF

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Publication number
US3807199A
US3807199A US00260361A US26036172A US3807199A US 3807199 A US3807199 A US 3807199A US 00260361 A US00260361 A US 00260361A US 26036172 A US26036172 A US 26036172A US 3807199 A US3807199 A US 3807199A
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Prior art keywords
thread
machine
stop motion
bobbin
knitting machine
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Expired - Lifetime
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US00260361A
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English (en)
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K Rosen
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Individual
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Individual
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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
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D04B15/52—Thread-feeding devices for straight-bar knitting machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
    • B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • ABSTRACT A thread delivery and control device for a flat weft knitting machine having a machine drive which can be switched off by the control device.
  • a thread storage device is positioned between the bobbin and the thread processing parts of the machine, and a stop motion device is located between the bobbin and thread storage device.
  • a signal transmitter as controlled by the machine, occupies one of two control positions when the machine is in given recurrent positions in which idling of the machine has little or no disadvantageous effect.
  • a coincidence circuit connects the stop motion device and signal transmitter to the control device.
  • the invention relates to a thread delivery and control device on flat weft knitting machines (Cotton machines) and similar machines, such as flat machines and Raschel machines, having a drive which can be turned off by a switch device.
  • the problem underlying the invention is to provide a thread delivery and control device for'the said knitting machines, whereby a fluent mode of operation is made possible and whereby the described irregularities in the knitted article are prevented by'stopping the sliding carriage in theevent of a thread breakage.
  • This problem is solved in accordance with the invention by a basically known storage means between the thread supply bobbin and the thread processing parts of the machine, a stop motion device between said bobbin and storage means, a signal generator which can be controlled by the machine and occupies one of two switch positions when the machine is in certain recurrent positions in which idling of the machine has little or no disadvantageous effect, and a coincidence circuit by which the stop mo'tion device and signal generator are connected to the switch device.
  • the invention is basedon the theory that in the case of the said knitting machines there are periodic time intervals during motion in which an idling machine does not have a disadvantageous effect on the knitted article. While, for example, in the case of a flat weft knitting .machine stopping of the machine during weft knitting has a particularly disadvantageous effect, stopping during application and cutting of the thread does not interfere with the process. The same applies to flat machines with which it is considerably more advantageous to stop the sliding carriage at one of its reversal points and not between them. The use of a thread'storage means makes it possible for the machine to continue moving as faras one of these points.
  • control of the machine is effected as follows.
  • a signal is given by the stop motion device whenever a thread breakage is detected.
  • the signal generator gives a periodic sequence of signals whenever the machine is in an interval of movement in which it can easily be rendered inoperative.
  • the coincidence circuit comprises two switches connected in series, one of which can be operated by the stop motion device and the other by the signal generator.
  • the control device which switches off the drive of the machine disconnects said drive whenever the two switches are simultaneously closed.
  • a preferred embodiment of the signal generator comprises a cam which is moved by the machine. One of the switch positions is reached if a plunger which moves over the camis located in a section of small radius, and the other switch position is reached if said plunger is located ina section of large radius.
  • FIG. 1 shows a schematic representation of a flat machine provided with a thread storage device
  • FIG. 2 shows a block circuit diagram of the control device according to the invention
  • FIG. 3 shows a schematic representation of several control units of a preferred embodiment
  • FIG. 4 is a schematic representation of a modified control system.
  • the part of a flat machine 1 shown in FIG. 1 comprises the needle bed 2 with the sliding carriage 3 mounted thereon.
  • the carriage 3 can be moved on the needle bed and is shown in a second position by broken lines 3'.
  • the thread F to be processed is fed to the flat machine 1 via a thread storage device 4.
  • the storage device 4 comprises a storage drum 5 on which a given quantity of thread 6 is constantly'stored. This type of thread storage device is described in US. Pat. No. 3,606,975 in the name of the same applicant.
  • Mounted on a vertical pin (not shown) on the storage device 4 is a bobbin 7 from which the thread F is unwound and fed to the storage drum 5 via thread guiding elements 8 which at the same time form part of a conventional stop motion device. Stop motion devices are known per se and are usually used to detect a thread breakage. There are also known stop motion devices which are susceptible to irregularities in the thread.
  • the stop motion device 9 only transmits a signal in the event of a located thread breakage.
  • the signal transmitter 10 is designed so that it periodically transmits asignal whenever the flat machine is in a position in which it can be easily stopped. In the case of the flat machine shown in FIG. 1 this is the position in which the carriage 3 is, as shown, located at its point of reversal.
  • the coincidence circuit 1 1 does not therefore transmit a signal to its output until the sliding carriage 3 has reached this point of reversal.
  • the control device 12 which is connected to the coincidence circuit 11 then causes the machine drive 13 to be stopped.
  • a dead time which occurs between the transmission of the output signal to the coincidence circuit 11 and the eventual stopping of the machine drive 13 or flat machine 11 can be taken into account if the signal transmitter 10 is controlled by the machine drive 13 with a given phase displacement.
  • the signal transmitter 10 is formed by a cam 19 controlled by the machine drive 13.
  • a plunger 15 which actuates a switch 16 moves over the circumference of the. cam.
  • the switch 16 is closed whenever the plunger 15 is located in the areaof the cam 19 having a smaller radius.
  • a second switch a is connected in series to the switch 16.
  • the series connection comprising a voltage supply 17 and a relay B is connected in parallel to these two switches.
  • the switch a is operated by a relay A located in the stop motion device 9.
  • the closed position of the switch 16 designates that position of the flat machine 1 in which the machine can be switched off. It can be seen that current only flows through the relay B when the two switches 16 and'a are closed.
  • FIG. 3 Another circuit as shown in FIG. 3 shows the machine drive 13 which is connected in parallel to the series connection comprising a voltage supply 18 and a switch b.
  • the switch b represents a contact of the relay B which is opened when current flows through said relay.
  • the machine drive 13 is therefore switched off as soon as current flows through the relay B.
  • a comparison between the block diagram shown in FIG. 2 and the circuit diagrams in FIG. 3 shows that the coincidence circuit 11 corresponds to the series connection comprising the two switches 16 and a.-
  • the circuit controlling the relay B is only closed when both switches 16 and a are simultaneously closed.
  • the control device 12 corresponds to the relay switch b.
  • cam 19 can also be provided with a plurality of separate sections of smaller radius if the machine has several positions in which it can be easily stopped.
  • the two switches 16 and a may as shown in FIG. 4 be also connected in parallel, instead of in series, the position for switching off the machine drive being given when both switches are open.
  • FIG. .4 the samereference numerals as appearing in FIG. 3 have been used except for the addition of a double prime thereto. The operation of e HQ mbpsi l i nt.is... zeh a e d sizey and thus a detailed description of same is not believed necessary.
  • the control device according to the invention may be generally applied to textile machines in which there occur intervals during movement in which it is more advantageous than in other intervals of movement to switch off the machine. What I claim is:
  • a thread delivery and control device associated with said machine for permitting at least a limited quantity of thread to be supplied to said thread processing parts afterbreakage of the thread as supplied from said bobbin for permitting continued operation of said machine until said carriage reaches a preselect'ed position, said thread delivery and control device including:
  • a thread storage device coacting with the thread as supplied from the bobbin to the thread processing parts for storing thereon a limited amount of thread so that sufficient thread will be available for supply .
  • stop motion device coacting with the thread between the bobbin and the thread storage device, said stop motion device including means associated therewith for indicating when the thread as supplied from the bobbin to *the thread storage device is broken; signal transmitting device controlled by said knitting machine and movable between two different control positions and occupying one of said control positions when the machine is in a given recurrent position in'which idling of the machine has little or no disadvantageous effect;
  • coincidence circuitry means operatively connected to said control device for switching off the machine drive means when said coincidence device is activated, said coincidence device being operativelyinterconnected to said stop motion device and said signal transmitting device and being activated only when said signal transmitting device is in said one control position and said stop motion device indicates a thread breakage.
  • the coincidencecircuitry means includes first and second switches,-one of said'switches being operatively connected to and actuated by said stop motion device, the other switch being operatively connected to and actuated by said signal transmitting device.
  • said first and second switches are connected in .s r qswith e ano 4.
  • said signal transmitting device includes a rotatable cam movable by said machine and positioned for actpating said other switch.
  • said threadstorage device includes a drum having a substantially constant quantity of thread .w9 a Jh i 6.
  • said preselected position comprises the point where the motion of said carriage is reversed.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US00260361A 1971-06-08 1972-06-07 Stop motion device for flat knitting machines Expired - Lifetime US3807199A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2128476 1971-06-08

Publications (1)

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US3807199A true US3807199A (en) 1974-04-30

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US00260361A Expired - Lifetime US3807199A (en) 1971-06-08 1972-06-07 Stop motion device for flat knitting machines

Country Status (13)

Country Link
US (1) US3807199A (enrdf_load_stackoverflow)
AU (1) AU457571B2 (enrdf_load_stackoverflow)
BR (1) BR7203692D0 (enrdf_load_stackoverflow)
CA (1) CA957859A (enrdf_load_stackoverflow)
CH (1) CH544172A (enrdf_load_stackoverflow)
CS (1) CS161053B2 (enrdf_load_stackoverflow)
DD (1) DD96269A5 (enrdf_load_stackoverflow)
DE (1) DE2128476C2 (enrdf_load_stackoverflow)
ES (1) ES402669A1 (enrdf_load_stackoverflow)
FR (1) FR2141100A5 (enrdf_load_stackoverflow)
GB (1) GB1349315A (enrdf_load_stackoverflow)
IT (1) IT959509B (enrdf_load_stackoverflow)
ZA (1) ZA723374B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002044A (en) * 1973-12-18 1977-01-11 Establissements A. Chromarat & Cie Yarn stop motion
WO1981002171A1 (en) * 1980-01-31 1981-08-06 Leesona Corp Loom stop motion system and method
US4754616A (en) * 1985-09-04 1988-07-05 Aktiebolaget Iro Yarn supply system
US5323625A (en) * 1992-03-17 1994-06-28 Angelo Paggiaro Electronic feeder apparatus for automatically controlling the tension of the yarn in a knitting machine and textile machines in general

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4137731A (en) * 1976-02-11 1979-02-06 Aktiebolaget Iro Thread supply device for textile machine having common thread control and tension sensing element
DE3617991A1 (de) * 1986-05-28 1987-12-03 Stoll & Co H Fadenspannungs-reguliereinrichtung fuer strickmaschinen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US379832A (en) * 1888-03-20 Electrical stop-motion for knitting-machines
GB619488A (en) * 1944-11-11 1949-03-10 I L Berridge & Co Ltd Improvements in and relating to the stop motion of knitting machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US379832A (en) * 1888-03-20 Electrical stop-motion for knitting-machines
GB619488A (en) * 1944-11-11 1949-03-10 I L Berridge & Co Ltd Improvements in and relating to the stop motion of knitting machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002044A (en) * 1973-12-18 1977-01-11 Establissements A. Chromarat & Cie Yarn stop motion
WO1981002171A1 (en) * 1980-01-31 1981-08-06 Leesona Corp Loom stop motion system and method
US4326564A (en) * 1980-01-31 1982-04-27 Lessona Corporation Loom stop motion system and method
US4754616A (en) * 1985-09-04 1988-07-05 Aktiebolaget Iro Yarn supply system
US5323625A (en) * 1992-03-17 1994-06-28 Angelo Paggiaro Electronic feeder apparatus for automatically controlling the tension of the yarn in a knitting machine and textile machines in general

Also Published As

Publication number Publication date
AU457571B2 (en) 1975-01-30
GB1349315A (en) 1974-04-03
DE2128476C2 (de) 1975-01-09
CA957859A (en) 1974-11-19
DD96269A5 (enrdf_load_stackoverflow) 1973-03-12
ES402669A1 (es) 1975-04-01
BR7203692D0 (pt) 1973-06-07
CS161053B2 (enrdf_load_stackoverflow) 1975-05-04
ZA723374B (en) 1973-03-28
DE2128476B1 (de) 1972-10-26
AU4279872A (en) 1973-11-29
CH544172A (de) 1973-11-15
IT959509B (it) 1973-11-10
FR2141100A5 (enrdf_load_stackoverflow) 1973-01-19

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