Merrow Class 70 - User Manual

INSTRUCTIONS
FOR SETTING UP
AND OPERATING
CLASS
MERROW
MACHINES
r
INTRODUCTION
This book is published !or the guidance of those persons responsible for the operation
and maintenance of Merrow Class 70 Butt-Seaming Machines. II contains diagrams and
descriptive information concerning the most common adjustments necessary to assure
maximum production of the highest quality. For individual problems, consult your nearest
Merrow Distributor.
The Merrow Class 70 Machines are designed and constructed for continuous and per-
fect operation at high speed . The utility and durability of Class 70 Machines are recog-
nized features or their design. Automatic lubrication, light, Crcely moving parts, and
easily adjusted assemblies, reduce to a minimum the maintenance required to obtain
superb performance.
Class 70 Machines overseam and trim simultaneously and produce either a one-
thread or two-thread stitch formation. By cutter adjustments, the seam configuration may
be a true butt seam, a gap seam or an overlap seam, while maintain ing the thinness
necessary for a good fabric processing joint.
We also make other classes of machines including Class "MG" Overstitching Machines,
Plain Crochet Machines, and Shell Stitch Crochet Machines. These machines are being used
successfully by manufacturers throughout the world.
THE MERROW a MACHINE COMPANY
240 Day St., Newington, CT 06111
Telephone {860) 666-0109
Fax (860) 666-TT30

Summary

Merrow Class 70 Introduction

Merrow Machine Parts Ordering

Merrow Class 70 Machine Setup

Class 70 Machine Setup Procedures

Step-by-step instructions for machine setup, including threading and securing the unit.

Merrow Class 70 Motor Drive Setup

Class 70 Motor Drive Operation

Guidance on motor drive equipment, V-belts, and ensuring proper operation.

Merrow Class 70 Lubrication

Class 70 Lubrication Procedures

Details on oil filling, reservoir capacity, and oil type recommendation for lubrication.

Merrow Class 70 Oil Meters

Class 70 Oil Meter Specs and Maintenance

Information on oil meter grades, factory selection, and recommended maintenance precautions.

Merrow Class 70 Base Assembly

Class 70 Base Assembly Components

Diagram and part identification for the machine base assembly, including oil drain and mounting.

Merrow Class 70 Needle

Class 70 Needle Types and Selection

Details on Merrow Class 70 needle sizes and selection criteria based on work.

Merrow Class 70 Needle Carrier

Class 70 Needle Carrier Adjustment

Procedure for adjusting the Needle Carrier Assembly for proper free swing and no lateral movement.

Merrow Class 70 Needle Plate

Class 70 Needle Plate Slot and Matching

Ensuring the needle plate slot is adequate for the needle and matches feed parts.

Merrow Class 70 Looper Setting

Class 70 Looper Co-operation

Instructions for setting and adjusting upper and lower loopers for proper interaction with the needle.

Merrow Class 70 Threading

Class 70 Threading Diagrams and Tension

Following threading diagrams and maintaining light thread tension for optimal results.

Merrow Class 70 Cutter Mechanism

Class 70 Cutter Mechanism Components

Diagram identifying parts of the upper and lower cutter mechanism.

Class 70 Cutter Adjustment

Class 70 Cutter Positioning

Adjusting cutter position for seam width (butt, gap, lap) and alignment.

Merrow Class 70 Cutter Sharpening

Class 70 Cutter Sharpening Procedure

Guidelines for sharpening cutters using a Merrow Cutter Grinder or sending them out.

Merrow Class 70 Feeding Mechanism

Class 70 Feed Dog and Mechanism Adjustment

Setting feed dogs, changing feed length, and adjusting feed mechanism tilt.

Merrow Class 70 Differential Feed

Class 70 Differential Feed Parts

Diagram illustrating the components of the differential feed mechanism.

Merrow Class 70 Y Type Feed

Class 70 Y Type Feed Application

Information on the Y Type Feed Mechanism used on specific Merrow Class 70 styles.

Class 70 Y Type Feed Disassembly

Class 70 Y Type Feed Disassembly Steps

Detailed steps for disassembling the Y Type Feed Mechanism and its components.

Class 70 Y Type Feed Adjustment

Class 70 Y Type Feed Adjustment Details

Adjusting feed stroke for stitch length variation and tension spring.

Merrow Class 70 Presser Foot

Class 70 Presser Foot Adjustment

Adjusting the presser foot tilt, positioning, and pressure for different fabrics.

Merrow Class 70 Frame Cap

Class 70 Frame Cap Removal

Procedure for removing and reassembling the Frame Cap Assembly, including cam roll oiling.

Merrow Class 70 Looper Carrier

Class 70 Looper Carrier Adjustment

Adjusting the Upper and Lower Looper Carrier Assemblies for proper travel and minimal lost motion.

Merrow Class 70 Shafts and Cams Removal

Class 70 Shafts and Cams Removal Procedure

Steps for removing the main shafts and cams, including oil reservoir considerations.

Merrow Class 70 Main Cams and Shafts

Class 70 Main Cams and Shafts Details

Detailed steps for removing oil collectors, cams, and shaft assemblies.

Merrow Class 70 Lower Shaft and Cam Removal

Class 70 Lower Shaft Cam Meshing

Procedure for removing the lower shaft and cam, and re-assembling gears correctly.

Merrow Class 70 Specifications

General

Brand	Merrow
Model	Class 70
Category	Sewing Machine
Language	English