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BAHIRDAR UNIVERSITY
SEMINAR -2 ON CAD/CAM IN KNITTING
Prepared by; Luwam Bahta
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Table of Contents
Introduction CAD/CAM Discipline
CAD/CAM Design Features
Circular Knitting Machine Control
Modern V-bed Knitting Machine Control
Advantages of CAD/CAM in Knitting
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Introduction
The CAD/CAM process is a geometric modelof a product under design in which the CAD
process is a subset of the design process and
the CAM process is subset of the
manufacturing process.
Application of computer graphics in knitting
industry CAD/CAM systems has two aspects:
1. Knitting structures design and
2. Design of knitting pattern shapes.
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Cont.
Electronic machine eliminates all punch cards,chains, rack wheel, peg drum which are
expensive and bulky.
Interactive computer graphics enables designerdraw pictures and display on the screen. Color
can be added or changed immediately. Pattern
can be rotated, stretched, mirror and scale.
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CAD design feature for knitting
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Cont.
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Auto, bias and mirror
pattern from CAD design
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Color Change and Pattern Composition by
CAD System
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CAM feature on color
selection Pattern assemble
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Pattern Developing by CAD system
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Electronic Circular Knitting Machine
Control
CAD/CAM are mainly used for jacquard single ordouble jersey knitting on large diameter circular
knitting machines. The content of CAM in piece goods
are:
The memory of the controller
The very large memory of the machine built in computer
can hold up a few different patterns, which can be called
up at any time, or mixing of patterns during knitting. Thepreparation of jacquard patterns are normally done on
CAD units and the final patterns are stored in the data
carriers for the knitting machine to read.
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Cont.
Shifting of colors on jacquard fabric.
Before knitting, color yarns are placed on the machine inspecified order like
feeder no 1 2 3 4 5 6 7 8
yam color A B C D A B C D
If the same pattern has to be knitted with differentcombination of color such as;
feeder no 1 2 3 4 5 6 7 8 and
yarn color B C DJ A B C D orfeeder no 1 2 3 4 5 6 7 8 and
yam color C D A B C D A B or
feeder no 1 2 3 4 5 6 7 8 and
yam color D A B C D A B C 13
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Principle
Computer
The flexibility of making decision, process data (yes orno) make it ideas for counted loop sequence, branchingor jumping operation.
ie. Electronically controlled knitting pattern preparation
and needle selectionMain Sections of Computer
CPU, Memory, Peripheral Interface
Input & output device
Input: sensors on knitting machine; keyboards, light-pen; tapes and discs.
Output : actuators on knitting machine, light; digital and
graphic display; tapes and printer. 14
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Cont.
Memory: ROM and RAM
Read only memory (ROM), non-volatile, cannot be
erased.
Hold important program and is programmed in
manufacturing.
Read and Write Memory (RAM)
Is volatile and data can be erased.
Use to store data and programme during processing.
Designer can freely explore his/her ideas using the
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Modern V-bed Knitting Machine Control
The modern V-bed machines abandoned the pasteboard
card control because:
The electronic parts are cheaper to produce than the
mechanical parts;
Numerical is more accurate and very fast in response;
Programs are easy to file or store;
Easy to duplicate the programs
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Numerical and computer control
Numerical Control
They are simple control for non-jacquard knitting. It
contains a control panel with function keys and control
knobs for data input. The major advantages is that no
pasteboard card and hole punching is needed.Computer Control
The numerical control is only good for simple knit
collars, rib straps and body panels without pattern.Once individual needle selection is involved, computer
control must be used.
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Cont.
Modern electronic V-bed m/c has :
Central Processing Unit: The brain of m/c control
with data like pattern, machine control, economizer,
pattern development.
Keyboard : This is used for giving command or makemodification.
Tape/Floppy reader : The pattern and data input
device Visual Display Unit : A monitor to display all
information of the knitting machine.
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Shima Seika Control System
1. Control tape
Similar to punch card in mechanical machine, it is a one inch paper
tape with 8 row holes. The tape is divided into block, one block is
the same as one punch tape.
2.Pattern tape
This sector contains all the pattern details. The design is normally
created in a CAD system and is now transferred as a series of holes
in the punch tape. The length of tape will depend on the pattern size,
the longer the design, the longer will be the tape.
3.Pattern development tape
This is to control the location of the pattern onto the fabric. It can be
mirror the design or repeat the design horizontal/vertically
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Modern V-bed Knitting Machine
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Advantages of CAD/CAM in Knitting
The CAD/CAM system enables the machine toknit the parts (cuts) of products or the whole
products in which;
It allows to avoid cutting the materials Reduces the number of operations
It leads to reduce the waste products to a
minimum.
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THANK-YOU!!!!!!!
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