Consew 255RB-2 manual

 CONSOLIDATED SEWING MACHINE CORP.
| — INDUSTRIAL SEWING & CUTTING EQUIPMENT
Instruction
Manual
CONTENTS
| Page
Setting up the machine carre ana aa ea aa ae ee AA A ae 1
Olling and it's adjustment ...................2 1
OIL adjuster o.oo ERA ere nrecr area area 2
Needle and thread ee RER RI IR IR II A E e arenero. 2/3
Inserting and removing bobbins .................200000me00e0eee e e AA 3
Winding bobbins and it’s adjustment ..................22. 000000 er A 3
Threading the machine ..................... RS 4
Regulating the thread tension .............ee EEE 5
“Adjustment of the presser feet pressure .............00000 0 A 5
Adjusting the stitch length and reverse stitch ....................... Lane een Bn
Adjusting the left of the alternating presser feet ................................... 6
How to reset the safety clutch mechanism................... UP 7
INFORMATION FOR ADJUSTMENT
Replacement of the timing belt ......... Lance caca ane nanas OTTER 7
Adjusting the height of the feed dog ...... Ce, ST 8
Adjusting the timing of the needle plate, needle and feeder..................... 9
Adjusting the height of the needle bar ............. PROT В 10
Timing between the hook and needle...................... e. BOT 10
Relative position between bobbin case and opener ........................ ns 11
Adjusting the height of the presser feet....................0000000000 AD 11
Timing of the vibrating presser foot ...........rsrrsrerre nana an are aan cannes sean e 0e 12
Adjusting the thread controller SpPring...........cocoiiiiiiiiii iii, 12
Fine adjusting of the lifting presser foot... STOTT 13
Changing the needle gauge ......... eer ree carecer. 13
255RB-1
SETTING UP THE MACHINE
Before setting up the machine on the table, attach the relative parts to
the table.
1. Hinge 2. Motor 3. Oil pan
4. Oil bottle 5. Knee lifter — 6. Stand
7. Treadle 8. Machine rest pin 9. Cotton stand
10. Cushion rubber 11. Head of machine 12. V belt
13. Bobbin winder
OILING AND IT'S ADJUTMENT
Do not operate the machine, even if for testing, unless it has been properly
oiled. ‘ | |
(1) To fill the oil reservoir on top of the machine, pour oil through the oil
filler hole (A), until oil level reaches to the upper reference line.
Olling is automatically made by the vibration of the machine while sewing
operation through the oiling wicks in the machine, and oil flow stops auto-
matically when the operation of the machine ends.
(2) The hook mechanism should receive careful attention when lubricating
the machine.
Push open the slide plate in the bed (the right and left plates in case of
two needle machine) and pull out the oil gauge (C). Fill oil in the resorvior
for the rotating hook mechanism up to the level marked on the oil gauge.
Care must be taken that oil flow stops when oil level falls to the bottom.
(3) Oiling adjustment to the hook mechanism. |
The maximum oil flow is made when the reference line on the oil ad-
justing knob (2) is in a line with the point (1), and it stops when the refer-
ence line is upright. |
To adjust this, loosen the pinch screw (3) and turn the oil adjusting knob, _
then tighten the pinch screw. | |
OIL ADJUSTER
Oiling to inside of arm top cover is automatically made by the vibration
of the machine while sewing operation. |
Stop oiling temporarily by the following method at your option in case
of long sewing operation.
When point of the dial enters into point of arm bed cover after turning
the dial, the dial goes down and oiling stops completely.
NEEDLE
The size of the needle to be used should be determined by the size of
the thread, which must pass freely through the eye of the needle. |
To insert the needle, turn the machine pulley over toward you until the
needle bar (1) moves up to it’s highest point, loosen the needle set screw (2)
and put the needle up into the needle bar as far as it will go, with the long
groove of the needle toward the left (but, toward inside direction in case of
two needle machine), and tighten the needle set screw securely. ;
Point
ati
ma
86
OIL ADJUSTER
THREAD
Cotton, synthetic or silk thread can be used according to your purpose,
the thickness of thread is up to #8.
Left twist thread should be used in the needle, but either right or left
twist thread can be used in the bobbin.
In case of two needle machine, use right twist thread in the left needle
for perfect stitching.
INSERTING AND REMOVING BOBBINS
Push open the slide plate (1), (in case of two needle machine, left-hand
and right-hand plates). Pull up the latch (2) of the bobbin case and lift the
bobbin (3) out of the bobbin case. -
To insert a full bobbin in the bobbin case, hold it between thumb and
index finger of your right hand. Place the bobbin on the center post of
the bobbin case and push down the latch (2). |
Be sure that the thread draws out from the bobbin from left to right.
Pull the thread into the slot (4) and between the bobbin case opener (5)
and the projection (6) and under the tension spring (7).
Draw out about 5mm of the thread on the needle plate and close the
slide plate leaving a sufficient space for passage of the thread.
WINDING BOBBINS AND ITS ADJUSTMENT
Push a bobbin on the bobbin winder spindle (1) as far as it will go.
Pass the thread from the thread stand downward through the eye (7) in the
tension bracket, then between and around the back of the tension disc, bring
the thread forward toward the bobbin and wind from below in clockwise
direction several times around the bobbin.
Push bobbin winder lever (3) downward until the wheel (2) contacts the
drive belt and then start the machine.
Beng:
After the bobbin is filled with thread, release will cause wheel to disengage
from the belt and winding will stop.
Cut the thread and remove the bobbin from the spindle.
Adjustment screw (5) can be turned in or out to increase or decrease the
amount of thread wound on the bobbin. |
When fine thread is wound on bobbins, use light tension.
It is regulated by turning the knurled nut (6) on the tension bracket at
the rear of the bobbin winder. |
Bobbin can be wound while the machine is sewing.
If the thread does not wind evenly on the bobbin, loosen the screw (4)
in the tension bracket and move the bracket to the right or left as may be
required, then tighten the screw.
THREADING THE MACHINE
Raise the needle bar to its highest point. |
From the thread stand, lead the thread to the thread guide (1) on top of
the machine arm, down to the upper guide hole of the thread guide (2) from
right to left. Pass the thread in weaving fashion through the other two holes
in (2) and from right to left over and between the tension discs (3). ÑNow
pull the thread downward from right to left beneath and around thread con-
troller (4), continue to pull the thread upward through the fork in the thread
controller and against the pressure of the check spring (5) and through the
thread guide (6), pull the thread upward through the eye in the take-up lever
(7) down through the thread guide (6) again and then through the thread
guide (8) and (9) and from left to right through the eye of the needle.
(In case of the two needle machine, pass the thread through the eye of
the needle from inside to outside).
4
REGULATING THE THREAD TENSIONS
For ordinary stitching, the tension of the upper and lower threads should
be equal so as to lock both threads in the center of the fabric. If the tension
on either thread is stronger than on the other, imperfect stitching will be the
result. |
If the tension on the upper thread is greater than that on the lower thread,
it will be straight along the upper surface of the fabric. |
If the tension on the lower thread is greater than that on the upper thread,
the lower thread will lie straight along the underside of the fabric.
—— Perfect stitching
Zza
SY N
КК
----- Tight tension of needle thread
----- Loose tension of needle thread
Fig. 8
A. TENSION OF THE UPPER THREAD |
To adjust the tension of the upper (Needle) thread, turn the serrated nut
(1) to the right for increasing tension. If you desire to decrease it, turn the
nut to the left. | |
B. THE TENSION OF THE BOBBIN THREAD
It is regulated by means of the tension screw (1).
To increase the tension, turn the screw to the right, and to decrease it,
turn the screw to the left by a screw driver.
ADJUSTING OF THE PRESSER FEET PRESSURE
The pressure of the presser feet is regulated by the adjusting screw (1).
To increase the pressure, turn the screw to the right and to decrease it
to the left by a screw driver.
Fig. 9 | Fig. 10
ADJUSTING THE STITCH LENGTH
The stitch length is changed by pressing Numerals on pulley] Stitch length
down the button (D, Fig. 2) in the bed plate show еды of (m/m)
of the machine and by simultaneously turning 3 —3
the handwheel slowly toward you. 4 6.5
In due course, the plunger will enter > >
7
8
9
into a notch in the feeding mechanism.
Hold the plunger down and continue to > -
turn the handwheel, either forward or rear- 10 75
"ward, until the marking with the desired . 12 21
number of stitches on the handwheel coincides 3 12
with the reference mark on the arm. Then | 24 1
release the plunger.
REVERSE STITCH
To do tacking for the purpose of locking the ends of seams, rapidly de-
press and release the lever (4, Fig. 15). |
When reversing feed of the machine, keep the lever (4) depressed as long
as required. For all other forward stitching, the lever remains in up position.
ADJUSTING THE LIFT OF THE ALTERNATING PRESSER FEET
The thickness of the material sewn should control the height of the lift
of the alternating presser feet.
It should normally be just high enough for clearance of the material.
With normal adjustment both feet lift to equal height. |
To adjust the lift, loosen the wing nut (1), move up the nut to raise the
lift and push down this nut to lower the lift.
When altering the lift of the lifting presser foot unequally against that of
the vibrating presser foot or vice versa, see the instructions 2. “ ADJUSTING
THE HEIGHT OF THE PRESSER FEET”.
HOW TO RE-SET THE SAFETY CLUTCH MECHANISM
The sewing hook and it’s mechanism are protected by a safety clutch. In
case the hook gets jammed with thread or other foreign matter, the safety
device disengages the driving belt, stops sewing, and thus prevents the ma-
chine from getting damaged. If it should become necessary to re-engage the
safety clutch, depress the button (E, Fig. 2) in the bed plate, at the same time,
turn the handwheel away from you until the locking mechanism re-engages
the drive shaft beneath the bed of the machine, open the slide plate above
the hook and rock handwheel back and forth to remove any foreign matter
which may hate lodged in the hook.
Do not use any sharp-edged tools, etc. lest the hook be damaged.
REPLACEMENT OF THE TIMING BELT
1. INSERTING THE BELT
Turn the balance wheel toward you until the take-up lever reaches to
its highest point.
Turn the lower shaft (1) until the arrow mark on the lower shaft bearing
collar (2) meets with another arrow mark on the timing plate (3).
Insert a new timing belt into the belt pulley at this position.
2. REMOVING THE TIMING BELT
Remove the arm top cover (F, Fig. 2) and remove the timming belt from
the belt pulley. loosen the collar set screw (1, Fig. 15).
Loosen the two set screws (G, Fig. 2) for the hand pulley and remove the
“hand wheel adjusting screw (1, Fig. 14), draw out the hand wheel from the
arm shaft. |
Loosen the arm shaft rear bushing set screw (2, Fig. 15), pull out the rear
bushing (3, Fig. 15) from the arm hole.
In case of the machine with reverse stitch mechanism, draw out the reverse
lever (4, Fig. 15) with its shaft.
Removing or inserting the timing belt is made through the hole drawn
out the rear busing.
After inserting the belt correctly, replace the rear bushing, screws, the
arm top cover, etc. to their original places. Finally, adjust the timing marks
mentioned in the item No. 1.
Fig. 14 — Fig. 15
ADJUSTING THE HEIGHT OF THE FEED DOC
The maximum height of the feed dog (1) from the surface of the needle
plate (2) is normally 1 mm.
To adjust this height, tilt the machine, turn the handwheel so as to raise
the feed dog to its highest point.
Loosen the set screw (4, Fig. 3) and raise or lower the feed dog as may
be required.
Then, securely tighten the set screw.
AbD Bf L
5
Fig. 16
ADJUSTING THE TIMING OF THE NEEDLE PLATE,
NEEDLE AND FEEDER
1. THE POSITION OF THE FEEDER AGAINST THE NEEDLE PLATE
Adjust the feed motion to the minimum and loosen the screw (4, Fig. 14).
Set the needle hole (1) on the feeder to 1.5 mm from the center (A) of
the hook, and after this adjustment, tighten the screw.
2. THE POSITION OF THE NEEDLE AND THE NEEDLE HOLE OF
THE FEEDER
To adjust this, turn the hand pulley until the needle bar raise to its highest
point and put a perfect needle. oN
Turning the handwheel to lower slowly the needle bar, check whether the
needle descends to the center of the needle hole of the feeder or not.
If the needle does not enter into the center of the hole, remove the side
plate (H, Fig. 2), loosen the screw (1, Fig. 18) through the window of the arm.
Holding the bottom of the needle bar rock frame (1, Fig. 19), move it as
may be required for getting the correct position to the feeder.
Then, tighten the screw and side plate.
Fig. 18 — Fig. 19
ADJUSTING THE HEIGHT OF THE NEEDLE BAR
1. When the needle bar is at its highest point, normally the measurement
between the surface of the needle plate and the upper end of the needle eye
1s 22.5 mm. | |
To adjust this, loosen the set screw (2, Fig. 19), move the setting position
of the needle bar and the needle bar connecting stud (3, Fig. 19) to get the
correct position. After this, tighten the set screw.
2. There is another method for this adjustment by setting the needle bar to
its lowest point. |
The normal position, in this case, is 4. 2 mm approximately from the hook
point to the upper end of the needle eye. nm
NOTE: These measurements are approximate standard, accordingly, following final adjustments
are recommended.
TIMING BETWEEN THE HOOK AND NEEDLE
After setting the needle bar height as stated 1. or 2., confirm as follows:
Set the stitch length to 0, turn the balance wheel to lower the needle bar
to its lowest point, turn the hand wheel toward you.
When the needle raises 1.8 mm from the lowest point of its travel, normally
the hook point is at the center of the needle, and the measurement between
the hook point and the upper end of the needle eye should be 2.4mm,
further the clearance between the hook point and the needle hollow should
be about 0.05 mm to 0.2 mm.
If they are not measured as above, adjustments are made as follows:
1. TIMING ADJUSTMENT
Loosen two set screws (1, Fig. 21), move the gear (2, Fig. 21) to the left
when making a faster motion of the hook against the needle. Move the
gear to the right when adjusting a slower motion of the hook against the
needle.
2. ADJUSTING THE CLEARANCE
Loosen the set screw (3) and (4) move the hook saddle (5) to the right
or left to get the correct clearance and tighten the screws. Be sure to use
perfect needle.
Fig. 20 | Fig. 21
10
11
RELATIVE POSITION BETWEEN BOBBIN CASE AND OPENER
1. Loosen the screw (1), turn the balance wheel until the opener (2) is
located at the extreme right hand position of its travel.
2. In this position, adjust it so that the clearance between the inside edge
of the opener and the tab on the bobbin case holder is about 0.2 mm.
After the adjustment, tighten the screw securely.
ADJUSTING THE HEIGHT OF THE PRESSER FEET
1. ADJUSTMENT BY, THE PRESSER BAR LIFTER
Loosen the screw (1, Fig. 11), raise the presser bar lifter and loosen the
set screw (1, Fig. 23).
Move the lifting presser foot up or down as may be required so as to
get the correct height and tighten the screws securely.
2. ADJUSTING THE LIFT OF ALTERNATING PRESSER FEET
On the model 255B and 339B if the height of the lifting presser foot
changes, the momentums of the lifting and vibrating presser foot vary, thus
the height of the vibrating presser foot must be adjusted.
A. Descend the presser bar lifter, holding the vibrating presser foot (5, Fig.
4), loosen the hexagon screw (2, Fig. 23), move the presser foot up or down
as may be required.
B. Tighten the screw securely.
Normally, the momentum of the alternating presser feet is equal, but for
piping work, it is effective to adjust less momentum of the vibrating presser
foot against that of the lifting presser foot.
TIMING OF THE VIBRATING PRESSER FOOT
This is the normal timing when turn the balance wheel toward you, after
lowering the presser bar lifter, the vibrating presser foot should reach the
feeder earlier than the needle eye comes to, and when the needle raises,
the vibrating presser foot should leave the feeder after the needle eye has
left the feeder. |
This is due to the reason that the vibrating presser foot must tightly hold
the goods while the needle is passing the goods for avoiding irregular stitches.
— lo adjust this, set the lift of alternating presser feet to equal, loosen the
screw (3, Fig. 23) and adjust the rotating position of the cam (4, Fig. 23)
faster or slower as desired, and tighten the screw. | ВЕ ;
Fig. 23
ADJUSTING THE THREAD CONTROLLER SPRING
Normally, the thread controller spring (2, Fig. 2) should hold slack of the
upper thread until the needle reaches to the goods, and it should pause
while rising of the needle and passing of the upper thread through the
bobbin case. | |
For more controller action on the thread, loosen the stop screw (3, Fig.
9) and set the stop to the right.
For less action, set the stop to the left. Then tighten the screw.
To strengthen the tension of the controller spring, loosen the serrated nut
(5, Fig. 9) and the screw (4, Fig. 19) and turn the tension stud (6, Fig. 9)
slightly to the left with a screw driver, or to lighten the tension, turn to the
right.
Then tighten the screws and nut.
13
FINE ADJUSTMENT OF THE UPPER FEED
Ordinarily, the feeding momentum of the lower feed synchronizes with
that of the upper feed. If, when the momentum does not synchronize, or
increasing or decreasing that of the upper and needle feed according to the
sewing conditions, the following adjustments are offered.
Loosen the nut (5, Fig. 14) and bring (6, Fig. 14) close to the feed driving
rock shaft (7, Fig. 14) for more feed momentum or keep away from for less
momentum. Tighten the nut firmly.
CHANGING THE NEEDLE GAUGE
1. In case of the two needle machine, remove the needles, presser foot,
needle clamp, needle plate and feed dog in this order.
As the needle clamp is screwed in the needle bar, turn it counter-clockwise
with a pair of pliers.
2. Рис the desired needle clamp in place by screwing it tight into the needle
ый =
Баг.
3. Loosen the needle bar connecting stud set screw (2, Fig. 19) and turn
the needle bar to correct the needle clamp’s direction.
4. Set the correct timing between the hook and the needle.
5. Put the feeder, needle plate and presser foot in this order securely.
Consolidated Sewing Machine Corp.
MAIN OFFICE BRANCH OFFICE
131 West 25th Street 7855 NW 29th Street, Bay 166
New York, NY 10001 Miami, FL 33122
Tel: (212) 741-7788 Tel: (305) 471-0200
Fax: (212) 741-7787 Fax: (305) 471-0243