Patents by Inventor Yoshio Mikuni

Yoshio Mikuni 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: 4817545
    Abstract: An upper thread is guided to extend vertically by a pair of thread guides vertically opposted to each other. A thread take-up lever is installed so that it is horizontally reciprocated across the space between the pair of thread guides. When the thread take-up lever is reciprocated, it engages the thread positioned between the thread guides to draw it in V-form during its forward travel and stops drawing the thread to form a slack in the thread in its return travel. To prevent this slacked thread portion from clinging to the thread take-up lever, a thread holding member or thread braking member made of easily deformable material and adapted to contact the thread to thereby prevent the thread from following the movement of the thread is installed at at least one position along the path of travel of the thread engaging portion (10, 10a, 10b, 10c 50) of the thread take-up lever.
    Type: Grant
    Filed: June 22, 1987
    Date of Patent: April 4, 1989
    Assignee: Maruzen Sewing Machine Co., Ltd.
    Inventors: Yoshio Mikuni, Osamu Tanaka
  • Patent number: 4803936
    Abstract: A plurality of tension disk assemblies in an overedge sewing machine are disposed on a shaft supported for rotation around its axis and are spaced apart from each other in an axially distributed relationship. Each tension disk assembly comprises first and second tension disks forming a pair for holding therebetween a thread to be tensioned. The first tension disk is movable in opposite directions axially of the shaft, and the second disk is substantially immovable in the direction of the axis of the shaft. The resilient force of a spring acts on each first tension disk, whereby the latter is pressed against the second tension disk associated therewith. When the shaft is turned, as by a manual operating lever, this rotary motion is converted into a linear motion through a cam device. This linear motion removes the resilient force of the spring from the first tension disk. Thus, a thread tension released state is established simultaneously in the plurality of tension disk assemblies.
    Type: Grant
    Filed: November 4, 1987
    Date of Patent: February 14, 1989
    Assignee: Maruzen Sewing Machine Co., Ltd.
    Inventors: Yoshio Mikuni, Osamu Koshinaka
  • Patent number: 4690080
    Abstract: An overedge sewing machine is adapted to perform three thread overedge stitching (STITCH TYPES 504 and 505) under the cooperating action of one needle (6) and an upper looper (15) and a lower looper (31). In addition to swing movement in the direction crossing the fabric feed direction, reciprocating movement in the fabric feed direction is selectively applied to the lower looper, whereby the front end of the lower looper is revolved around the needle. If the lower looper is revolved around the needle with the upper looper out of action, this operation provides double chain stitching (STITCH TYPE 401). Further, if the lower looper is revolved around the needle with the upper looper in action, this operation provides three thread double chain overedge stitching (STITCH TYPE 601).
    Type: Grant
    Filed: July 15, 1986
    Date of Patent: September 1, 1987
    Assignee: Maruzen Sewing Machine Co., Ltd.
    Inventors: Yoshio Mikuni, Osamu Koshinaka
  • Patent number: 4688501
    Abstract: A slit (7) is formed which lies in a vertical plane and extends from an upper surface of a sewing machine frame (1) to a front surface. A tension device (5), a thread take-up spring (30), and upper and lower thread guides (23, 24) are disposed along the direction in which the slit (7) extends. A thread take-up lever (12) is installed so that it is reciprocated horizontally across the space between the pair of thread guides (23, 25). The placement of the thread in the tension device (5), thread take-up spring (30), and two thread guides (23, 24) can be attained by simply pulling the upper thread vertically downward through the slit (7). When the thread take-up lever is reciprocated, during its forward stroke it arrests the portion of the thread positioned between the two thread guides (23, 24) and draws it in V form. During its return stroke, the thread take-up lever (12) releases the thread to allow the latter to loosen in loop form.
    Type: Grant
    Filed: May 2, 1986
    Date of Patent: August 25, 1987
    Assignee: Maruzen Sewing Machine Co., Ltd.
    Inventors: Yoshio Mikuni, Osamu Tanaka, Kimikazu Matsuda
  • Patent number: 4660487
    Abstract: A loop taker (18) has a loop taker body (20) molded of resin in one piece, and a hook (22) made of metal. A rotary shaft (13) is fitted in the center of the loop taker (18), and a set screw (17) threadedly inserted in the end of this rotary shaft holds down the loop taker (18). A pin (36) fixedly installed on the rotary shaft (13) is fitted in a radially extending groove (37) in the loop taker (18), whereby the loop taker (18) is connected to the rotary shaft (13) so that it will not rotate relative to the rotary shaft.
    Type: Grant
    Filed: October 16, 1985
    Date of Patent: April 28, 1987
    Assignee: Maruzen Sewing Machine Co., Ltd.
    Inventor: Yoshio Mikuni
  • Patent number: 4638750
    Abstract: A loop taker (18) has a loop taker body (20) molded of resin in one piece, and a hook (22) made of metal. A rotary shaft (13) is fitted in the center of the loop taker (18), and a set screw (17) threadedly inserted in the end of this rotary shaft holds down the loop taker (18). A pin (36) fixedly installed on the rotary shaft (13) is fitted in a radially extending groove (37) in the loop taker (18), whereby the loop taker (18) is connected to the rotary shaft (13) so that it will not rotate relative to the rotary shaft.
    Type: Grant
    Filed: October 23, 1985
    Date of Patent: January 27, 1987
    Assignee: Maruzen Sewing Machine Co., Ltd.
    Inventor: Yoshio Mikuni
  • Patent number: 4424758
    Abstract: An embroidering apparatus for use with a sewing machine has a body supported on a bed and movable back and forth and laterally along guide rails extending perpendicularly to each other. A table and a support frame to which an embroidery frame is attachable are mounted on the body for movement therewith. A fixed tracing needle is oriented to the table on which an original pattern is to be placed. In operation, the table can be manipulated to permit the tracing needle to follow the original pattern on the table while the latter is being moved around. For certain pattern configurations locking or stop devices are employed for selectively locking the table and support frame against rotation or for constraining the frame to only rectilinear movement.
    Type: Grant
    Filed: November 20, 1981
    Date of Patent: January 10, 1984
    Assignee: Maruzen Sewing Machine Company
    Inventors: Yoshio Mikuni, Tadao Kohara, Yoshihide Yoneda