ELNA E9020 Service Manual page 4

(4) Feed mechanism
1. Feed amount ........................... 0 to 5 mm (in increments of 0.1 mm in the range from 0.2 to 1.0 mm, and 1.5 mm, 2.0 mm, 2.3 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4 mm, 4.5
2. Reverse stitching length.......... 0 to 5 mm (for straight stitch) Fixed at 0.5 mm (for the other patterns)
3. Feed amount adjustment ........ By the manual switch mounted on the LCD
4. Reverse stitching .................... The machine performs reverse stitching at low speed (115 rpm) while the reverse stitching switch is ON.
5. Lateral feed ............................. Fixed at 2 mm when a lateral feed pattern is specified.
6. Descending of feed dog .......... Automatically comes down when the embroidering device is set on the machine.
(5) Special-purpose mechanism
1. Automatic thread tension controller
By the thread-feeding stepping motor Manual switch for increasing/decreasing the amount of needle thread of the automatic thread tension controller by a material
thickness sensor (to increase/decrease the amount of thread in 8 steps)
2. Automatic thread trimmer
Lateral STM is actuated by pressing the thread trimming switch so as to bring the thread trimming mechanism in the standby state. Then the hook driving shaft turns one
and a half times (when the machine has stoped with its needle down) or two times (when the machine has stopped with its needle up) by the sewing machine drive motor
and the main shaft is disengaged at the first turn. The machine actuates the thread trimming knife to cut the thread (115 rpm) and stops with its needle up. Disengagement
of the main shaft is released before stop.
3. Automatic backtack sewing
By pressing key after selecting the pattern, backtack sewing is performed at beginning and end of sewing, and the needle and bobbin threads are cut finally.
4. Helpful pictograph
Operation lever, bobbin winder, buttonholing set, running out of needle thread, pattern selection display, inoperative key display, limit of pattern memory display, pattern
in storing, calling display (when the embroidering device is set), needle raising indication, embroidery frame installing indic ation, embroidery frame changing indication,
embroidery card inserting indication, difference of embroidery carc indication, pattern clearing indication, and bobbin thread remaining amount indication
5. Automatic needle threading mechanism
When setting thread to the thread retaining section of the thread transfer body, threading from the section to needle is automatically performed by pressing the key of
the operation panel.
6. Automatic buttonholing
Auto-return type fully-automatic buttonholing
Buttonhole size detection, automatic stop after backtacking at thge sewing end (backtacked (L ans S) key hole). Buttonholing plate is provided.
7. Bobbin thread remaining amount
Bobbin thread remaining amount is detected by the LED sensor when the bobbin thread is running out, and the message is shown on the LCD. Then the sewing
machine stops.
8. Limit sensor
In order to prevent the bobbin from being excessively wound when automatically winding bobbin, the sensor monitors during bobbin winding and detects that the bobbin
is wound more than the specified amount. Then bobbin winding automatically stops.
mm and 5.0 mm)
Feed amount (pitch) is given on the LCD.
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