Back to results
US 4,493,278 AGranted
Rotary loop taker for lock-stitch sewing machine
AssigneeBakron Corp.
InventorPaul Badillo
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeBakron Corp.
InventorPaul Badillo
Estimating the term…
A rotary loop taker, for use in a lock-stitch sewing machine, which has a detachable and replaceable hook or loop seizing point. A lug extending downwardly from the main body of the replaceable loop seizing point abuts one end wall of a cut-away portion of the annular frame of the rotary loop taker, and carries a foot that extends inwardly from the annular frame toward the rotatable shaft of the device. The inwardly extending lug foot desirably nests in a notch in the crosswise support member on which the annular frame of the rotary loop taker rests, preferably forming a snug fit with the upper surface of the crosswise support member. The preferable form and dimensions of the loop seizing point and the foot extending inwardly from the downwardly extending lug are disclosed. Ledges formed in the inner wall of the replaceable loop seizing point define the initial portion of the raceway for the bobbin case with which the rotary loop taker is used. The loop seizing point is reliably secured to its circular frame in one embodiment by means of screws and stud means providing accurate alignment of the loop seizing point with the frame. In another embodiment, it is secured by releasable means that not only permits separation of the loop seizing point from the annular frame without any movement in the radial direction with respect to the frame, but is also located in an exposed position readily accessible to the operator of the machine.
A rotary loop taker for rotation about a generally cylindrical bobbin case maintained in a substantially fixed position in a lock-stitch sewing machine below the take-up device of said machine, in which sewing machine the needle provides one of the two threads that form said lock-stitch, said needle thread being taken off the needle in the form of a loop by the loop seizing point of said rotary loop taker as the loop taker rotates about the bobbin case, the vertical midsection of the side wall of said bobbin case carrying a radially extending rib for engaging the loop taker as the latter rotates about said bobbin case, which comprises:
A detachable loop seizing point for use in a rotary loop taker mounted to rotate about a generally cylindrical bobbin case maintained in a substantially fixed position in a lock-stitch sewing machine below the take-up device of said machine, in which sewing machine the needle provides one of the two threads that form said lock-stitch, said needle thread being taken off the needle in the form of a loop by the loop seizing point of said rotary loop taker as the loop taker rotates about the bobbin case, the vertical mid-section of the side wall of said bobbin case carrying a radially extending rib for engaging the loop taker as the latter rotates about said bobbin case, said rotary loop taker including a frame of substantially annular construction on which the loop seizing point is installed, said frame having a cut-away portion along one segment of its circumference to provide space for the needle thread to exit from the loop seizing point of the rotary loop taker as said thread is pulled off said loop seizing point by the take-up device, said cut-away portion being defined by opposing end walls of said frame facing upon said cut-away portion, said rotary loop taker also including a frame support member extending crosswise of said substantially annular frame, with one edge portion of said crosswise extending support member facing said cut-away portion of said frame, said one edge portion of said crosswise extending support member and the one of said frame end walls that is at the trailing end of said cut-away portion during forward rotation of said frame defining a lug-receiving notch, said notch having a first wall that is generally parallel to the circumference of said frame and a second wall that is generally radially positioned with respect to said frame, said notch extending inwardly from the outer circumference of said frame, extending along said frame in an angular direction opposite to the direction of forward rotation of the frame, and extending axially of said rotary loop taker entirely through said crosswise extending support member, which loop seizing point comprises:
A rotary loop taker for rotation about a generally cylindrical bobbin case maintained in a substantially fixed position in a lock-stitch sewing machine below the take-up device of said machine, in which sewing machine the needle provides one of the two threads that form said lock-stitch, said needle thread being taken off the needle in the form of a loop by the loop seizing point of said rotary loop taker as the loop taker rotates about the bobbin case, the vertical midsection of the side wall of said bobbin case carrying a radially extending rib for engaging the loop taker as the latter rotates about said bobbin case, which rotary loop taker comprises:
A detachable loop seizing point for use in a rotary loop taker mounted to rotate in a substantially horizontal plane about a generally cylincrical bobbin case maintained in a substantially fixed position in a lock-stitch sewing machine below the take-up device of said machine, in which sewing machine the needle provides one of the two threads that form said lock-stitch, said needle thread being taken off the needle in the form of a loop by the loop seizing point of said rotary loop taker as the loop taker rotates about the bobbin case, the vertical midsection of the side wall of said bobbin case carrying a radially extending rib for engaging the loop taker as the latter rotates about said bobbin case, said rotary loop taker including a frame of substantially annular construction on which the loop seizing point is installed, said frame having a cut-away portion along one segment of its circumference to provide space for the needle thread to exit from the loop seizing point of the rotary loop taker as said thread is pulled off said loop seizing point by the take-up device, said cut-away portion being defined by opposing end walls of said frame facing upon said cut-away portion, said rotary loop taker also including a frame support member extending crosswise of said substantially annular frame, with one edge portion of said crosswise extending support member facing said cut-away portion of said frame, which loop seizing point comprises:
A rotary loop taker for rotation about a generally cylindrical bobbin case maintained in a substantially fixed position in a lock-stitch sewing machine below the take-up device of said machine, in which sewing machine the needle provides one of the two threads that form said lock-stitch, said needle thread being taken off the needle in the form of a loop by the loop seizing point of said rotary loop taker as the loop taker rotates about the bobbin case, the vertical midsection of the side wall of said bobbin case carrying a radially extending rib for engaging the loop taker as the latter rotates about said bobbin case, which rotary loop taker comprises:
A detachable loop seizing point for use in a rotary loop taker mounted to rotate, in a substantially vertical plane, about a generally cylindrical bobbin case maintained in a substantially fixed position in a lock-stitch sewing machine below the take-up device of said machine, in which sewing machine the needle provides one of the two threads that form said lock-stitch, said needle thread being taken off the needle in the form of a loop by the loop seizing point of said rotary loop taker as the loop taker rotates about the bobbin case, the vertical midsection of the side wall of said bobbin case carrying a radially extending rib for engaging the loop taker as the latter rotates about said bobbin case, said rotary loop taker including a frame of substantially annular construction on which the loop seizing point is installed, said frame having a cut-away portion along one segment of its circumference to provide space for the needle thread to exit from the loop seizing point of the rotary loop taker as said thread is pulled off said loop seizing point by the take-up device, said cut-away portion being defined by opposing end walls of said frame facing upon said cut-away portion, said rotary loop taker also including a frame support member extending crosswise of said substantially annular frame, with one edge portion of said crosswise extending support member facing said cut-away portion of said frame, which loop seizing point comprises:
A rotary loop taker for rotation in a substantially horizontal plane about a generally cylindrical bobbin case maintained in a substantially fixed position in a lock-stitch sewing machine below the take-up device of said machine, in which sewing machine the needle provides one of the two threads that form said lock-stitch, said needle thread being taken off the needle in the form of a loop by the loop seizing point of said rotary loop taker as the loop taker rotates about the bobbin case, the vertical midsection of the side wall of said bobbin case carrying a radially extending rib for engaging the loop taker as the latter rotates about said bobbin case, which comprises:
A rotary loop taker for rotation, in a substantially vertical plane, about a generally cylindrical bobbin case maintained in a substantially fixed position in a lock-stitch sewing machine below the take-up device of said machine, in which sewing machine the needle provides one of the two threads that form said lock-stitch, said needle thread being taken off the needle in the form of a loop by the loop seizing point of said rotary loop taker as the loop taker rotates about the bobbin case, the vertical midsection of the side wall of said bobbin case carrying a radially extending rib for engaging the loop taker as the latter rotates about said bobbin case, which comprises:
A rotary loop taker for rotation, in a substantially horizontal plane, about a generally cylindrical bobbin case maintained in a substantially fixed position in a lock-stitch sewing machine below the take-up device of said machine, in which sewing machine the needle provides one of the two threads that form said lock-stitch, said needle thread being taken off the needle in the form of a loop by the loop seizing point of said rotary loop taker as the loop taker rotates about the bobbin case, the vertical midsection of the side wall of said bobbin case carrying a radially extending rib for engaging the loop taker as the latter rotates about said bobbin case, which comprises:
A rotary loop taker for rotation, in a substantially vertical plane, about a generally cylindrical bobbin case maintained in a substantially fixed position in a lock-stitch sewing machine below the take-up device of said machine, in which sewing machine the needle provides one of the two threads that form said lock-stitch, said needle thread being taken off the needle in the form of a loop by the loop seizing point of said rotary loop taker as the loop taker rotates about the bobbin case, the vertical midsection of the side wall of said bobbin case carrying a radially extending rib for engaging the loop taker as the latter rotates about said bobbin case, which comprises:
Dependencies are inferred from the claim text.