Reece 32

6. END DENSE CIRCUIT

GENERAL DESCRIPTION The function of the end dense circuit is to 1ange the stitching at the start and at the end of the itching cycle (ends· of th·e pocket) from normal msity (center group long stitches) to end density ,e stitches. This is acco·mplished by energizing the 1d dense solenoid at the start of the stitching cycle 1d just before it reaches the end and stops sewing. ,is solenoid operates to control the density of the itch at the beginning and end of the sewing cycle, , alternately operating through the Dense Start and ense Finish switches for time controlled durations. CIRCUIT DESCRIPTION The end dense solenoid is energized when its 15 volt ac circuit is completed through triac QB. I I 6. END DENSE CIRCUIT WIRING DIAGRAM

Triac QB conducts the 115 volts ac when 24 volts de is applied to its gate terminal.

The dense start circuit directs 24 volts de to triac QB through the Clamp Table Forward and Dense Start switches when the Clamp table is in the back position. The Dense Start switch is actuated when the clamp table travels forward a short distance in a sewing cycle and opens the dense start circuit, thereby de-energizing the end dense solenoid. The Dense Finish switch is actuated at the end of the pocket sewing cycle. It is ganged with the Length switch and actuated by the same lever when a block set on a roller bracket passes over the switch arm.

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CIRCUIT BOARD COMPONENTS · ®

R20

END DENSE SOLENOID lil

0

I

QB

TP22

BL

D31

TBI-1

I

115VAC

DENSE- FINISH SWITCH

I

I -

® @

MAIN TEST POINTS

ALTERNATE TEST POINTS

None 14Y, 15V, WNH, WNJB

3Y 16Y

-- w

BL-W

CLAMPTABLE

FORWARD SWITCH @

TP25, TP26, 17-19Y, FRAME None WNJB

14Z TP22 TP28

2Z

24VDC

From the Library of Superior Sewing Machine & Supply LLC