Setting The Looper (Cont.); Setting The Feed Dogs For Plain Feed; Setting The Feed Dogs For Differential Feed - JUKI UnionSpecial 35800DLU Adjusting Instructions / Illustrated Parts List

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Table of Contents

FIG. 8

TORQUE:

19 - 21 in. lbs.

(2.1 - 2.4 Nm)

1/16" (1.6mm)

FIG. 9

Plain Feed

FIG. 10

Differential Feed

FIG. 10A

If more or less looper avoid motion is required, remove cylinder

side cover (A, fig. 8) located at the lower front left side. For plain

feed use a screwdriver to loosen looper avoid link ball joint (B).

For differential feed use Union Special wrench TT85 and loosen

screw stud (C) Moving ball joint down in the lever slot increases

the amount of looper avoid motion, moving it up acts the

reverse. Retighten ball joint (B), or screw stud (C) securely.

NOTE: Whenever looper avoid is changed looper clearance to

needle must also be reset.

The height of the needle bar is correct when the top of the

needle eye is 1/16" (1.6mm) below the underside of the looper,

with the looper point even with the right side of the needle. To

make adjustment loosen screw (A, Fig. 9) and move needle bar

(B) as required to attain dimension.

NOTE: Care must be taken not to disturb the alignment of the

needles when moving the needle bar either up or down.

Assemble the main feed dog and throat plate. Main feed dog

(A, Fig. 11) at its highest position, should be set to project above

the throat plate, the depth of its teeth. The feed dog mounting

screw (B) and front support screw (C) should be set to maintain

this setting.

The feed should be set so there is equal clearance between the

front of the feed dog and the front of the feed slot in the throat

plate when the feed dog is at its most forward travel. The same

amount of clearance should be between the back of the feed

dog and the back of the feed slot in the throat plate when the

feed dog is at its most rearward travel. To attain this setting

loosen screws (A and B, Fig. 10) and remove plug screw (D).

Using a screw driver turn eccentric pin (C) clockwise or counter-

clockwise to obtain proper setting. Tighten screws (A and B),

reinstall plug screw (D).

SETTING THE FEED DOGS FOR DIFFERENTIAL FEED

Before assembling the main and differential feed dogs, set the

feed bar eccentric pin (A, Fig. 10A) located in the left side near

center of cylinder, so that the slot in the head is in a horizontal

position for the 35800DLU, DNU, and DZ style machines and

turned counter clockwise to an approximate 45° for the

35800DWW style of machine. The pin can be used to slightly tilt

both feed dogs if necessary. The feed bar pin is retained in

position by set screw (B). Assemble differential feed dog (A, Fig.

11A), main feed dog (B) and throat plate. Both the main and

differential feed dogs can be individually adjusted to height.

Main feed dog (B) at its highest position, should be set to project

above the throat plate, the depth of its teeth. If adjustment is

necessary loosen screw (D) and move feed dog (B) up or down

to attain correct setting. Feed dog support (C) should support

front of feed dog.

NOTE: If eccentric pin (A, Fig. 10A) is used to tilt the feed dogs,

make sure that the looper does not interfere with the rear

needle guard and that the needle guard does not pinch

the needle loops on the back side of the needles.