Patents by Inventor Hartmut Schindler

Hartmut Schindler 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).

  • Patent number: 6151920
    Abstract: A circular knitting machine for the production of knitwear formed of yarns and fibers tied into these yarns is described. The circular knitting machine contains a needle cylinder (1) with knitting needles (2), a sinker ring (15) which is rotatable about an axis of rotation jointly with the needle cylinder (1) and has sinkers (16), a stationary cylinder cam and sinker cam means which is associated with the knitting needles and sinkers, respectively, yarn and fiber feed units, an air guiding unit (45) provided with at least one suction nozzle and/or blowing nozzle, and a control cam (85) for acting upon the inserted fiber tufts.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: November 28, 2000
    Assignee: Sipra Patententwicklungs- u. Beteiligungsgesellschaft mbH
    Inventors: Hartmut Schindler, Earl Robert Quay, Xuejian Zhu, Aiken Anderson Still, IV
  • Patent number: 5275023
    Abstract: The invention relates to a device on a knitting machine equipped with slider needles for controlling the laying in of a thread (28) into the open needle hooks (5.2). In order to avoid that the thread is not laid into the hooks correctly or that a thread which has already been laid into the hook, jumps out of the hook (5.2) during the closing movement of the slider parts (6) on account of vibrations or the like, the slider parts (6) of the slider needles are provided with inclined faces (6.5) which project when the hooks (5.2) are closed into the thread spaces (32) formed by these hooks and the needle and slider parts (5,6). In this way the thread portions between the thread guide (29) and the slider needles are pressed deeply into the thread spaces (32) during the closing movement of the slider parts (6), so that the thread sections laid into the following slider needles with hooks still open come securely into the respective thread spaces (32) or are retained therein FIG. 3).
    Type: Grant
    Filed: April 30, 1992
    Date of Patent: January 4, 1994
    Assignee: SIPRA Patententwicklungs-und Beteiligungsgesellschaft mbH
    Inventor: Hartmut Schindler
  • Patent number: 5129240
    Abstract: The invention relates to a circular knitting machine comprising a carrier for knitting implements, a cam arrangement and a heat exchange apparatus, and a provision of uniform temperature conditions on a circular knitting machine of that kind. The heat exchange apparatus comprises two circuits of which one is associated with the carrier and the other with the cam arrangement and which have a liquid heat exchange agent, preferably water, flowing through them. The uniform temperature conditions are achieved by the heat exchange output of at least one circuit being so controlled that substantially the same temperature difference obtains between the carrier and the cam arrangement in all operating conditions of the circular knitting machines.
    Type: Grant
    Filed: November 8, 1990
    Date of Patent: July 14, 1992
    Assignee: SIPRA Patententwicklungs-u.Beteiligungsgesellschaft mbH
    Inventor: Hartmut Schindler
  • Patent number: 4905484
    Abstract: In a multiple system circular knitting machine having an electromagnetic needle selection, the needle and jack cam races are supported on a stationary support ring which rests on a plurality of radially directed and mutually spaced ribs. To improve operational reliability and maintenance of needle selection devices, each selection electromagnet is mounted at an end portion of an elongated holder and is situated in a circumferential recess in the needle cylinder opposite end portions of respective selecting jacks. The magnet holders are adjustably secured to the lower surface of the support ring. The needle selecting cams include a pair of circumferentially staggered and axially superposed pressing cams of which the leading lower pressing cam first engages the lower end portion of the selecting jack and moves the same radially inwardly to a point where the upper pressing cam takes over and presses an armature surface of the end portion of the jack against an electromagnet.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: March 6, 1990
    Assignee: Sipra Patententwicklungs-und Beteiligungsgesellschaft mbH
    Inventor: Hartmut Schindler
  • Patent number: 4408118
    Abstract: Input pulses generated by rotation of a knitting machine are used to produce output pulses that energize needle selection mechanisms therein. A control system operates in such a fashion as to advance the output pulses with respect to the input pulses, while keeping pulse frequency constant. The control system is clocked, and a forward counter is programmed with a number which is dependent upon knitting machine speed, and which number is derived from the number of clock pulses intervening between subsequent input pulses. After the forward counter has been so programmed, it is clocked by the clock until the appropriate number of clock pulses has been counted. At that time, a pulse is generated by reverse counter and a monostable multivibrator, which is used to produce an output pulse according to a program stored in a PROM. Provision is made to bypass the counter when the knitting machine is operated at low speeds.
    Type: Grant
    Filed: July 7, 1980
    Date of Patent: October 4, 1983
    Assignee: Sipra Patententwicklungs- und Beteiligungsgesellschaft mbH
    Inventors: Gerhard Grozinger, Hartmut Schindler, Franz Schmid