12. TREADLE UNIT
12-1. Types
•Two types of treadle unit are available: a type which controls the automatic presser foot lifter and a type which does not control it.
•It is possible to switch between the two specifications by <A> Changing the hooking position of the spring (1) inside the treadle unit; <B> setting DIP switch No. 2; and <C> setting the treadle depression stroke.
SPECIFICATIONS | Treadle unit |
| Treadle unit |
Operation | Does not control the automatic presser foot lifter |
| Controls the automatic presser foot lifter |
<A> | [a] |
| [b] |
Difference in |
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spring position |
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| （1） |
| （1） |
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| 1839M |
| 1840M |
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<B> | DIP switch No. 2: OFF |
| DIP switch No. 2: ON |
DIP switch | <When treadle is depressed forward> |
| <When treadle is depressed forward> |
setting | Presser foot control signal is not output while |
| Automatic presser foot lifting signal is output |
| treadle is being depressed. |
| immediately before the depression force suddenly |
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| changes. |
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<C> | Make the settings in |
| Make the settings in |
Signal setting | treadle depression stroke”. |
| treadle depression stroke”. |
| Set the “Neutral position”, “Maximum forward |
| Set the “Neutral position”, “Maximum forward |
| depression position” and “Maximum backward |
| depression position” and “Maximum backward |
| depression position”. |
| depression position”. |
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| The modulation position for the depression force |
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| at the first step is set automatically. |
<D> | <When depressing forward or depressing backward> |
| <When depressing forward or depressing backward> |
Depression force | The depression force hardly changes at all from |
| The depression force suddenly changes at a point |
| the start of depression until the maximum |
| between the start of depression and the |
| depression. |
| maximum depression. |
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<E> | <When depressed forward> |
| <When depressing forward or depressing backward> |
Depression | Sewing machine starts. |
| Automatic presser foot lifting signal is output |
signal | <When depressed backward> |
| immediately before the depression force suddenly |
| Sewing machine starts. (*1) |
| changes, and the sewing machine starts at the |
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| point after the force suddenly changes. |
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(*1) The presser foot lifting signal is output while the treadle is being depressed backward. However, if DIP switch No. 1 is set to OFF, the presser foot lifting signal is not output while the treadle is being depressed backward after the knee switch has been used to lift the presser foot.
In addition, if memory switch No. 41 is set to “1”, the presser foot lifting signal is no longer output while the treadle is being depressed backward.
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