C4: Computerized, Direct Drive, Single Needle, Differential Feed, Overlock Machine (3 Thread)
C4: Computerized, Direct Drive, Single Needle, Differential Feed, Overlock Machine (3 Thread)

C4: Computerized, Direct Drive, Single Needle, Differential Feed, Overlock Machine (3 Thread)

Jack Sewing Co, LTD
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The C4 Series is a new and powerful overlock stitch machine that has been developed to offer increased reliability and ease-of-use, while upgrading seam quality at higher sewing speeds. The "Intelligent Fabric Recognition" system automatically detects and responds to a fabrics thickness, smart adjusting to compensate for a wider range of materials and processes to finish high-quality soft-feeling seams without operator adjustment. With the operating noise having been reduced due to a coaxial shaft driven by a direct drive servo motor, this increases durability and seam quality. The improved sealed oil system virtually eliminates costly oil stans compared to competitor similarly priced models and feature automatic functions such as auto thread trimmer, auto foot lifter and varying operation modes from fully automatic to manual to help reduce operator fatigue.


  • Direct Drive Servo Motor
  • Intelligent Fabric Recognition System
  • Adjustable Sewing Speed
  • Automatic Foot Lifter
  • Automatic Thread Cutter
  • Full Automatic/Semi Automatic/Manual Operation Modes
  • Needle Position Sensor
  • Differential Feed
  • Oil Proof Needlebar
  • Integrated Adjustable LED
  • Complete with Table and Stand

Work Smarter

The Jack C4 is the culmination of over 25 years of customer feedback and R&D. One of the most advanced and affordable overlock machines in the market second to our Jack C5, the C4 takes operator efficiency to a new level. Built on the same all steel chassis as the rest of the Jack lineup making for one of the quietest and smoothest overlock machines available.

Simplified Control

The control panel is the heart of the Jack C4. Control functions like the auto thread trimmer, auto foot lifter and set sewing speed all within arms reach. In addition, the control panel also controls the sewing modes of the C4 allowing the machine to operate in manual mode, semi automatic mode or fully automatic mode.

User Friendly

The Jack C4 is very user friendly and intuitive in design. The looper system was designed to allow feeding of a wide variety of materials without having to constantly adjust tension. The workspace is well lit with integrated LED lights. A thread trimmer can also be found allowing the operator to manually control the integrated thread trimming device.

Fabric Thickness Detection

The Jack C4 comes equipped with optical sensors on the bed of the machine that work in conjunction with the "Fabric Thickness Detection" system. This allows the sensors, in conjunction with the presser foot to detect the thickness of the material and adjust tension automatically. The rear sensor is also used to detect when the auto thread trimmer function should cut the thread as it passes over the sensor.

Automatic Foot Lifter

The Jack C4 features automatic presser foot lifter standard, at the price point of some of our competitors mechanical machines.

Direct Drive

The Jack C4 features the same coaxial direct drive shaft technology allowing for smooth, quiet operation compared to our competitors. The machtronics of the machine have been redesigned allowing for one of the fastest stitch speeds in the industry.

Modern Design

The Jack Sewing Machine Co. LTD, lineup of machines have all undergone design updates improving not only functionality but aesthetics. In addition to the redesigned machine head, the heavy duty table and stand have all undergone updates as well. Each machine ships as a complete set.

Machine Specifications


Lightweight - Medium Weight Fabrics

Feed Type

Differential Feed

Max. Sewing Speed

7,000 Stitches/Min

Differential Ratio





Integrated Direct Drive AC Servo

Lubrication System




Presser Foot Height



DCx27 #14 (11-14) (19 Optional)

Needle Distance

Unser Specified


Integrated 3-Way Adjustable LED

Box 1:

  • -Jack C4 Machine Head
  • -Jack Thread Stand
  • -Jack Tool Set
  • -Jack Machine Cover
  • -Jack Parts Catalog and Manual
  • -Jack Machine Oil
  • -Bobbin and Needle Set

Box 2:

  • -Jack C4 Table
  • -Jack Heavy Duty Stand

Eligible for Flat Rate Shipping; machine ships unassembled via Fedex Ground/Home Delivery. Please check our Shipping Policy for details.