Patents by Inventor Pietro Bonalumi

Pietro Bonalumi 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).

  • Thread tension control for sewing machines
    Patent number: 4300464
    Abstract: A separate pair of tensioning elements for the needle thread and for the looper thread in sewing machines adapted to form seams of stitches on a succession of workpieces which are advanced in the direction of sewing by a main transport device and an auxiliary transport device disposed in spaced relation to the latter. A sensing device and control device is operatively associated with the tensioning elements and tension is caused to be applied by each pair of elements on their respective thread when a workpiece is present in the main transport device. Upon advance of the workpiece to a point where its advance is effected solely by the auxiliary transport device, the tension imposed by one of each pair of elements is automatically released.
    Type: Grant
    Filed: November 5, 1979
    Date of Patent: November 17, 1981
    Assignee: Rockwell-Rimoldi, S.p.A.
    Inventor: Pietro Bonalumi
  • Workpiece advancing apparatus for sewing machines
    Patent number: 4258639
    Abstract: A device for supporting and guiding a folded workpiece to the stitching needle of a sewing machine by advancing the same between a pair of cylindrical members mounted on the machine for rotation in opposite directions. Each of the cylindrical members is provided with circumferential grooves on their peripheral surfaces with the grooves of each being in general alignment with those of the other. The configuration of the grooves in combination with the spacing between the cylindrical members causes the folded workpiece being advanced therebetween, to become deformed to the extent where portions thereof enter the grooves to effectively support its weight while accurately guiding it along the level of its intended path of travel.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: March 31, 1981
    Assignee: Rockwell-Rimoldi, S.p.A.
    Inventor: Pietro Bonalumi
  • Workpiece guide for sewing machines
    Patent number: 4098202
    Abstract: A guide for directing two pieces of fur to the stitching instrumentalities of a sewing machine for joining one to the other. The guide includes a funnel shaped element having channels formed adjacent its narrowest end that are separated by a depending guide plate. A source of compressed air is directed into the channels and serves to maintain the fur on the upper portion of the two pieces in a position where it had been folded inwardly and downwardly between the pieces by the upper surfaces of the funnel shaped element and the depending guide plate.
    Type: Grant
    Filed: April 25, 1977
    Date of Patent: July 4, 1978
    Assignee: Rockwell-Rimoldi S.p.A.
    Inventors: Nerino Marforio, Pietro Bonalumi