Method for producing shoe upper and shoe upper
There is provided a method for producing a shoe upper capable of producing a shoe upper having a double structure with high productivity. A tubular inner side knitted fabric portion ( 19 ) to become an inner side portion of the shoe upper and a tubular outer side knitted fabric portion ( 11 ) to become an outer side portion of the shoe upper are knitted with the inner side knitted fabric portion ( 19 ) and the outer side knitted fabric portion ( 11 ) lined on left and right on the needle beds and with foot insertion opening corresponding portions ( 110, 190 ) of the knitted fabric portions ( 11, 19 ) connected (process α). In this case, at least one of the inner side knitted fabric portion ( 19 ) and the outer side knitted fabric portion ( 11 ) is knitted using a fusible knitting yarn including a heat fusible yarn. The inner side knitted fabric portion ( 19 ) is tucked in an interior of the outer side knitted fabric portion ( 11 ) to form a shoe upper having a double structure (process β). The shoe upper having the double structure is fitted to a last and a thermal process is carried out (process γ).
1. A method for producing a shoe upper of producing a shoe upper using a flat knitting machine including at least a pair of a front and a back needle bed and a yarn feeder for feeding a knitting yarn; the method comprising the processes of:
process α of knitting a tubular inner side knitted fabric portion to become an inner side portion of the shoe upper and a tubular outer side knitted fabric portion to become an outer side portion of the shoe upper with the inner side knitted fabric portion and the outer side knitted fabric portion lined on left and right on the needle beds and with foot insertion opening corresponding portions of the knitted fabric portions connected;
process β of tucking the inner side knitted fabric portion in an interior of the outer side knitted fabric portion to form a shoe upper having a double structure; and
process γ of fitting the shoe upper having the double structure to a last and carrying out a thermal process; wherein
at least one of the inner side knitted fabric portion and the outer side knitted fabric portion is knitted using a fusible knitting yarn including a heat fusible yarn in the process α to adhere the outer side knitted fabric portion and the inner side knitted fabric portion with the heat fusible yarn melted during the thermal process in the process γ and to form the shoe upper having the double structure into a shape corresponding to the last.
2. The method for producing the shoe upper according to claim 1 , wherein the inner side knitted fabric portion and the outer side knitted fabric portion are knitted from a heel toward a toe in the process α.
3. The method for producing the shoe upper according to claim 1 , wherein, an inner side cutout extending from the foot insertion opening corresponding portion of the inner side knitted fabric portion toward a toe and an outer side cutout extending from the foot insertion opening corresponding portion of the outer side knitted fabric portion toward the toe are formed in the process α.
4. The method for producing the shoe upper according to claim 1 , wherein knitting of thickening at least a part of the inner side knitted fabric portion and the outer side knitted fabric portion is carried out.
5. A shoe upper having a foot insertion opening, the shoe upper comprising:
an outer side knitted fabric portion, and an inner side knitted fabric portion overlapped in an interior of the outer side knitted fabric portion; wherein
the outer side knitted fabric portion and the inner side knitted fabric portion are adhered by a melted heat fusible yarn;
a foot insertion opening corresponding portion of the outer side knitted fabric portion and a foot insertion opening corresponding portion of the inner side knitted fabric portion are connected with a knitting yarn; and
stitches of the foot insertion opening corresponding portion of the outer side knitted fabric portion and stitches of the foot insertion opening corresponding portion of the inner side knitted fabric portion are directed in the same direction in a length direction of the shoe upper.
6. The method for producing the shoe upper according to claim 2 , wherein, an inner side cutout extending from the foot insertion opening corresponding portion of the inner side knitted fabric portion toward a toe and an outer side cutout extending from the foot insertion opening corresponding portion of the outer side knitted fabric portion toward the toe are formed in the process α.
7. The method for producing the shoe upper according to claim 2 , wherein knitting of thickening at least a part of the inner side knitted fabric portion and the outer side knitted fabric portion is carried out.
8. The method for producing the shoe upper according to claim 3 , wherein knitting of thickening at least a part of the inner side knitted fabric portion and the outer side knitted fabric portion is carried out.