Stitch adjustments 35
4-thread overlock
When the upper looper thread lies on the underside of the
fabric
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higher position.
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When the lower looper thread appears on the top of the
fabric
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When the left needle thread tension is too loose 0RYHWKHQHHGOHWKUHDGWHQVLRQÀQHWXQLQJOHYHUEOXH
toward a higher position.
When the right needle thread tension is too loose 0RYHWKHULJKWQHHGOHWKUHDGWHQVLRQÀQHWXQLQJOHYHU
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Safety stitch
When the lower looper thread tension is too loose 0RYHWKHORZHUORRSHUWKUHDGWHQVLRQÀQHWXQLQJOHYHU
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When the upper looper thread lies on the underside of
the fabric
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When the lower looper thread appears on the top of the
fabric
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When the right needle thread tension is too loose 0RYHWKHQHHGOHWKUHDGWHQVLRQÀQHWXQLQJOHYHUJUHHQ
toward a higher position.
When the chainstitch needle thread tension is too loose 0RYHWKHFKDLQVWLWFKQHHGOHWKUHDGWHQVLRQÀQHWXQLQJ
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Chainstitch
When the chainstitch needle thread tension is too loose 0RYHWKHQHHGOHWKUHDGWHQVLRQÀQHWXQLQJOHYHUEOXH
toward a higher position.
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Coverstitch
When the coverstitch looper thread is too loose 0RYHWKHFRYHUVWLWFKORRSHUWKUHDGWHQVLRQÀQHWXQLQJOHYHU
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When the coverstitch left needle thread tension is too loose 0RYHWKHFRYHUVWLWFKOHIWQHHGOHWKUHDGWHQVLRQÀQHWXQLQJ
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lower position.
When the coverstitch middle needle thread tension is too
loose
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toward a lower position.
When the coverstitch right needle thread tension is too
loose
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toward a lower position.
When the top surface of fabric bulges between needle
threads and the seams on the underside of the fabric
becomes tight;
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