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AssigneeYamato Sewing Machine Seizo Co., Ltd.
InventorsMasato Okabe, Norio Nakata, Hiromichi Kurata, Takayoshi Masaoka, Itsuo Sakai
Estimating the term…
An interlock stitch sewing machine for blindstitch hemming with a slippage preventing device is provided which is so constructed as to prevent slippage that is likely to occur due to a position error of a lower fabric portion of the fabric portions stacked by a top-stitching at the fabric end, or a locally deformed portion due to a cutting error, in the blindstitch hemming of a tubular article such as T-shirts or underwear. A top-stiching width guide and a fabric edge guide are oppositely disposed in front of a needle location. A slippage detecting sensor that detects the edge position of the lower fabric portion to detect the presence of slippage, is attached to the fabric edge guide. When the slippage quantity detected by the sensor exceeds a permissible slippage quantity, it is determined there is possibility of slippage, and an informing means is operated. Thereby, a faulty sewing such as slippage can be reliably prevented by previously detecting a position error of the lower fabric portion or a deformed portion due to a cutting error.
In an interlock stitch sewing machine for blindstitch hemming which comprises a top-stitching width guide that defines the width of a top-stitching toward the back of a fabric and makes contact with a bent portion of a lower fabric portion and an upper fabric portion overlying thereon in said top-stitching, to guidedly feed said bent portion in a sewing direction, and a fabric edge guide that makes contact with an edge of said lower fabric portion to guidedly feed said edge in said sewing direction, said top-stitching width guide and said fabric edge guide being oppositely disposed in front of a needle location in a direction orthogonal to said sewing direction, characterized in having a slippage preventing device comprising:
Dependencies are inferred from the claim text.