Merrow Class 70 - Merrow Class 70 Machine Setup; Class 70 Machine Setup Procedures; Merrow Class 70 Motor Drive Setup; Class 70 Motor Drive Operation

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
THE MERROW MACHINE COMPANY ______________ _ _ _
INSTRUCTIONS FOR SETTING UP AND OPERATING MERROW CLASS 70
SETTING THE MACHINE
1. Upon removing the machine from its box, observe its threading carefully and compare ii
with the threading diagram supplied with the machine.
2. Keep this threading diagram for further reference. The matter of threading is very
important and if difficulty arises, the threading of the machine should be compared with the
individual
threading diagram supplied. Threading is simple but must be accurate.
3. Secure the machine to the table with the screw and boll provided. This assembly should
be parallel with the center line of the motor and in such a position that when the machine is set
on the assembly, the front of the machine will be three or four inches back from the front of
the table with Its hand wheel to the right of the operator .
4.
Assemb le thread stand and screw its base to the table in back of the machine.
5. The thread guides at the top of the thread stand should be directly over the center of the
cones of thread.
6. The thread should be wound on cones which should stand vertically. The thread from the
cone should lead to the top of the thread stand, through the eye on the cross rod and over the
other leg of the U shaped cross rod.
7. Be sure the thread will come off the cones readily , with uniform tension and that it cannot
catch under the cone or be otherwise retarded.
8. Since oil has been drained from the machines before shipping, the main reservoir must be
filled before the machine is used. (Note section 14.)
SPEEDS
The Styles 70-D3B-2 and 70-Y3B-2 have a recommended speed of 2250 stitches per minute. Styles
70-O3B and 70-Y3B are designed to run at 1500-1800 stitches per minute, Merrow Styles 70-ABB,
70-AON-l and 70-ABBY are designed to run 2800-3000 stitches per minute. Style 70-1D-2isdesigned to
run 4000 stitches per minute. While these machines may run well with little care, they will give better
results with suitable attention.
MOTOR DRIVE UNIT
9. To obtain full efficiency, the motor drive equipment must be kept in good operating con-
dition in order to start and stop the machine with minimum delay. When laying out the motor
drive equipment, attempt should be made to avoid driving from a large pulley to a re l atively
smaller pulley, the centers of which are close together, as such an arrangement will allow
excessive slippage of the belts, materially reducing the speed of the start and stop of the
Merrow Machine.
10. A
V-Belt Hand Wheel with an effective {pitch) diameter of 3-1/3" {85 mm) is supplied with
70-O3B
and Y3B Models. On 70-ABB and ABBY machines the effective (pitch) diameter is
2-1/8" (54 mm) . If an individual motor is used, the machine may be run with a 3/8" (9. 5 mm)
width
endless V-Belt. Where round belting is used, either 1/4" (6. 5 mm) or 5/16" (8 mm)
round belting may be used.
11. The top of the Hand Wheel of all Class 70 machines must tu r n away from the operator .
12.
Consult your nearest Merrow Distr ib utor to assure proper motor dr ive equipment.
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