U.S. BLIND STITCH 1118 Series Instruction Manual

1118 SERIES
U.S. BUND
STITCH
EXPRESS STREET & SKYLINE DRIVE
PLAINVIEW, NEW YORK 11803
Telephone: 516^33-4350
CABLE ADDRESS: "BLINSTIT PLAINVIEW YORK"
Standard Subclasses
MAINTENANCE & PARTS CATALOG
©1979
as BLIND STITCH MACHINE CORP.
-ui
^fWTflAMe
From the library of: Superior Sewing Machine & Supply LLC

Ill - MAINTENANCE INSTRUCTIONS
FOR 1118,1099 & 1108 SERIES
INTRODUCTION
A. Replacing the Looper
B. Replacing the Needle Guide
C. Replacing the Shoe
D. Replacing the Feeder
From the library of: Superior Sewing Machine & Supply LLC

MAINTENANCE INSTRUCTIONS
INTRODUCTION
All U.S. BLIND STITCH machines are designed for longlifeand trouble-free performance. When
installed and lubricated in accordance with the INSTALLATION AND OPERATING INSTRUC
TIONS, onlythe minimum maintenance normally associated withindustrial sewing machines will
be required. These maintenance requirements willgenerally be confined to the four locations des
cribed below, at which wear may beexpected after extended use. When suchweardoesoccur, the
worn part may be readily replaced by following the appropriate instructions. For ease of installa
tion, and to insure satisfactory service, it is essential that only genuine U.S. BLIND STITCH parts
and needles are used. They are the only parts designed specifically for the machine, with the built-
in longlife and excellent wearing characteristicstypical of the U. S. BLIND STITCH machine.
A. REPLACING THE LOOPER
1. Should it become necessary to replace the looper (item "B" in Figure 6),
loosen the looper clamp screw (item "A" in Figure 6) and remove the old
looper. Because of the precise fit of the looper in the looper rod it may be
necessary to exert amoderate amount of force to pull the looper out. Insert
the new looperinto the endof the rod asfar asit will go before bottoming on
the looper shoulder.
2. Any timea looperis moved or changed, recheck the looper timing and reset
if necessary. Proper looper timing is absolutely essential for correct stitch
formation. As described in detail below, aproperly timedlooper will pass
over the needle in the correct position to pick up the loop, and also clear the
chain-off pin, feeder, looper slot, and needle. The first check pointfor timing
the looperisat the position where the looper picks the threadloop off the
needle during the needle returnstroke. Referring to Figure 7, (Point"C"),
the long prong of the looper should passover and just clear the scarf of the
needle, approximately 3/32" (2.4mm) behind the end of the needle eye. At
the same time, the short prong of the looper should passover the needle with
about 1/64" (.406mm) clearance, and must be so set that it also clears the
chain-off pin (item "D" in Figure 7).
From the library of: Superior Sewing Machine & Supply LLC

4.
To adjust the looper so that the timing checks out as noted in paragraph 2,
It may be rotated within its clamp by a limited amount. This adjustment
should be made with the looper clamp screw (item "A" in Figure 6) loosened
and the looper bottomed against its shoulder. Do not move the looper in or
out, and do not attempt to force the looper to turn beyond the limited
amount of travel available.
If the adjustment described in paragraph 3 is insufficient to provide the correct
timing, it will be necessary to turn the looper rod (item "E" in Figure 6) itself.
TOs may be accomplished by loosening with looper rod clamp screw (item "C"
m Figure 6). The rod is then free to turn in the looper rod fork (item "D" in
Figure 6). It will normally be necessary to make only a very small adjustment
m order to get the looper into the correct rotational position for proper timing.
If, for any reason, the rod has been removed or the basic setting of the looper
rod has been disturbed by a large amount, it may be reset by noting that the
distance from the center of the looper rod fork pin (item "F" in Figure 6) to
the rear face of the looper rod ball (item "G" in Figure 6) is normally 4& 3/32
inches (104mm) (refer to Figure 6). If the rod is set to this dimension then only
minor adjustment will be required to bring the looper into the correct timing
position. Note that this dimension is merely a guide to assist in setting a rod and
vanations maybeexpected from machine to machine.
If, after completing the above adjustments, it is found that the looper is either
too low or too high, it will be necessary to adjust the eccentric stud. First loosen
the two set screws (item "A" in Figure 7). Place a wide blade screwdriver in the
slot of the eccentric stud (item "B" in Figure 7) and, using a slight turning motion,
raise or lower the looper as required. Once the proper height is established, check
to see whether the looper must be moved to the left or to the right prior to retight-
ening the eccentric block set screws. If such a movement is required, it may be ob
tained by lightly tapping the eccentric block in the correct direction with the
handle of ascrewdriver.
From the library of: Superior Sewing Machine & Supply LLC

0\
FIGURE 6
From the library of: Superior Sewing Machine & Supply LLC

6. Once the looper is timed with respect to the needle as outlined in paragraphs 2
thru 5above, slowly turn the handwheel in a direction away from the operator,
until the looper approaches the edge of the looper slot. (Point "C* in Figure 8)
in the presserfoot. At this point make sure the small prong
of the looper clears
this edge. If it does not clear, adjust the eccentric block as outlined in paragraph
5 until the interference is eliminated.
6A. If timing of looper still proves difficult, its possible that looper sweep required
adjustment. If looper is too close to chain off pin and also, too close to needle
guide on opposite position, the looper sweep is too short.
If looper on pick up stroke, is too far to right of chain off pin and too close to
needle rest at left of presserfoot, the looper sweep is too wide.
For adjustment, refer to insert illustration (Figure 6). To widen looper sweep,
flex or bend looper crank in direction of arrow
"H".
To shorten looper sweep, flex or bend looper crank in direction of arrow "J".
Both adjustments should be gradual and sweep checked frequently.
7. Continue turning the handwheel away from the operator until the point of the
needle starts to
enter the area in between the looper prongs. (Refer to Point "D"
in Figure 8). If the needle strikes the crotch of the looper, the looper has general
ly been set too far forward. Check to see if the looper has been inserted into the
clamp as far as it will go. It should be inserted until the shoulder on the looper
is stopped on the clamp. If this check is satisfactory, recheck the distance from
the center
of the looper rod fork pin to the rear face of the looper rod ball. Refer
to paragraph 4 and reset if necessary. If neither of the above two measures cor
rects the problem, it is possible that the needle lever may be set too low and
required adjustment.
From the library of: Superior Sewing Machine & Supply LLC

FIGURE 7
From the library of: Superior Sewing Machine & Supply LLC

8. Once clearance is established between the needle and the looper crotch,
continue turning the handwheel away from the operator until the needle
passes between thelooper prongs, clearing both thelongand the short prong.
If difficulty is experienced at thispoint,it may be necessary to modify some
of the previous adjustments to the eccentric blockor the looperrod length.
If thisisdone,recheck the previous pointsto insure that a position isestab
lished which will satisfy all of the clearance conditions.
9. After all the necessary adjustments have been made, tighten all set screws and
the locknut and recheck allthe adjustment points. Referring to Figure 9, the
loopershould nowclearthe chain-offpin ("D"), feeder("E"), looper slot
("F"), needle, and
pass overthe needlein the correct position to pick up the
loop.
B. REPLACING THE NEEDLE GUIDE
1. Afterconsiderable service, it maybeexpected that the wearing actionof the
needle willcause a sharp edgedgroove to form on the needle guide(item "G"
in Figure 9).
This condition can cause thread breakageand uneven penetration. When this
happens the guide should be replaced. The needle guide was specifically design
ed as a readily replaceablewearplate to prevent damage to the presserfoot from
the action of the needle.
2. Loosen the needleguideattachingscrew(item "A" in Figure9) and remove the
worn needle guide. Clear out any lint or dirt that may have accumulated under
the old guideand insert the new guide. Insure that the new guide is seated flush
with the top and sideof the presserfootand then retighten the attaching screw.
Slowly turn the handwheel in the direction away from the operator and check
to insure that the new guide fits properly under the needle and that no inter
ference has been introduced between the guide and the looper.
REPLACING THE SHOE
1. The shoe, (item "E" in Figure 8), also known as a cloth retainer, normally will
not required replacement. However, in the event of wear due to the particular
fabricsbeingused, or if the shoe or springsuffers any damage,they may be
readily replaced.
2. The first step is to remove the complete front guideassembly by unscrewing the
front guide holder attaching screw (item "A" in Figure 8). Next loosen the shoe
pin and the shoe eccentric barrel lock screws, (item "B" Figure 8), and slide out
the shoe pin (item "F"), shoe and retaining spring (item "G")- Beforeremoving
these components it is advisable to note the manner in which the springis assem
bled so that it may be reinstalled in the same way.
From the library of: Superior Sewing Machine & Supply LLC

e
A
FIGURE 8
(j
FIGURE 9
From the library of: Superior Sewing Machine & Supply LLC

3. When replacing an old shoe, make sure that the replacement shoe properly fits the
pin without binding and without excessive looseness. In the event that the pin has
worn and does not fit the newshoe properly,it shouldbe replaced at the sametime
asthe shoe-pin. After replacing the shoe, shoe pin spring into shoe eccentric barrel, re-
tighten screws (item "B" Figure 8), and check to insure that the center of the shoe
is lined up with the center of the rib. Also insure that the shoe clears both sides of
the opening of the presserfoot.
4. Inand out position of shoe should nowbe checked. Forlight fabrics, shoe should
be as closeto needle as possible. For heavy fabrics with seam,shoe should be set
back as far as possible from needle. To move shoe in and out turn eccentric barrel
(item"I" Figure 8), Afterthe correctlocation isestablished, besure to tighten
screws, (item "B" Figure 8).
4A. An additionalshoeadjustment isalsopossible. Theheight of the shoe can now be
controlled, (item "H" in Figure8). Thisis a tapered pin and position can be ad
justed so that the shoe, whenever required, can be controlled as far as elevation is
concerned. By moving the tapered pin in or out the shoe can be kept from pressing
downon some fabrics whichrequire little, if any shoe pressure. By having this
control, it sometimes will aid in penetration of difficult fabrics. The normal posi
tion of the shoe, when set properly on most fabrics, is that the shoe will show move
ment on the penetration cycle on one ply of fabric.
5. REPLACING THE CHAIN OFF PIN
1. After considerable service,it may become necessary to replace the chain off
pin, (Item "D" in Figure 7).
2. Remove the chain off pin attaching screw and remove the chain off pin, clean
out any lint or dirt that may have accumulated. Attach the new chain off pin,
using the screw previously removed. Insure that the chain
off pin is against the
side and forward edge of the slot in the presserfoot, and then tighten the screw.
From the library of: Superior Sewing Machine & Supply LLC