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है”ह”ह

IS 15449-2 (2004): Household Zig-Zag Sewing Machine Head,Part 2: Accuracy Requirements [MED 29: Sewing Machines]

1

mm

RrqRFT-al

IS15449(Part 2):2004

r? m ‘b

IndianStandard

HOUSEHOLD ZIG-ZAG SEWING MACHINE HEADPART 2 ACCURACY REQUIREMENTS

Ics 61.080

0 BIS 2004

II BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

.4ugust 2004 Price Group 4

Sewing Machines Sectional Committee, ME 29

FOREWORD

This Indian Standard (Part 2) was adopted by the Bureau of Indian Standards, after the draft finalized by theSewing Machines Sectional Committee had been approved by the Mechanical Engineering Division Council.

This standard has been formulated to facilitate standardization and with a view to establish quality and accuracyrequirements of zig-zag sewing machine head for household purpose.

In the preparation of this standard, assistance has been derived from IS 7491:1989 ‘Household sewing machinehead — Accuracy requirements (first revision)’.

The standard on household zig-zag sewing machine head is being brought in four parts. This standard covers theaccuracy requirements of household zig-zag sewing machine head, the other parts in the series are:

Part 1 General requirements

Part 3 Sewing requirements

Part 4 Durability requirements

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2:1960‘Rules for rounding off numerical values (revised’. The number of significant places retained in the rounded offvalue Should be the same as that of the specified value in thk standard.

IS 15449 (Part 2) :2004

IndianStandard

HOUSEHOLD ZIG-ZAG SEWING MACHINE HEADPART 2 ACCURACY REQUIREMENTS

1 SCOPE 2 ACCURACY REQUIREMENT

This standard (Part 2) covers the accuracy requirements 2.1 Functional Dimensionsfor zig-zag sewing machine head for household

Clearance and heights at various points on the machinepurpose.

shall be as follows:

SI Item Measuring Condition Measuring Direction Ref StanalwdNo. to Fig. Assembly

Dimensionmm

i) Feed dog Height of the feed dog teeth A feed dog raised to its 1 1.2, Maxabove needle/throat plate highest position

ii) Shuttle and Clearance between heel of Shuttle heel at bottom 2 0.25, A4inshuttle driver shuttle and corresponding most position 0.55, Max

tip of shuttle driver

iii) Needle and Clearance between needle Needle at bottom most 3 0, Minshuttle and corresponding face to position 0.05, Max

shuttle

iv) Presser foot Gap between presser foot Presser foot in lifted 4 5.0, Minand needle/throat plate condition

v) Bight Distance between two Zig-zag bight knob at 5A 5.0’) , Max(Zig-zag) extreme needle positions its maximum position 5B

when needle vibrationadjustment is at itsmaximum

vi) Disc Clearance between disc Needle bar at its 6 0.25, Mixfollowe+) follower pin and the highest bottom most position

point of disc No. 1

‘Optional requirementsdependingupon the design specificationsof the sewingmachine,

IS 15449 (Part 2) :2004

2.2 Assembly Clearance

The assembly clearances on the machine at various points shall meet the following requirements:

slNo.

i)

ii)

iii)

iv)

v)

vi)

Item

Needlebar

Threadtakeup lever

Shuttle

Armshatt

Flywheel

Feedsection

Measuring Condition

Needle bar at lowermost position

Thread take up lever attop, intermediate andbottom positions

a)

b)

.

Tip of shuttle pin attop most/bottommost position ofneedle barDifference betweentwo indicatorreadings whenneedle bar is at itshighest and lowestposition

At different fly wheelpositions (tuim flywheel by hand). Axialpushlpull to be given

a) Rotate fly wheel tomeasure wobb~mg

b) Rotate fly wheel tomeasure eccentricity

At the highest positionof feed - dog - aboveneedle plate

3 METHOD OF TESTS

MeasuringDirection

a) In the directionof motion

b) At right angle tothe direction ofmotion

a) In the directionof motion.

b) At right angle to

I the direction ofmotion

a) Along the axisof shuttle pin

b) Along the axisof shuttle pin

Axial direction

Axial direction

Radial direction

In the direction 01motion

Indicator Position

a) Top of needlebar

b) Near thebottom ofneedle bar

a) Around threadhole

b) Around threadhole

a) Tip of shuttlepin

b) Tip of shuttlepin

Face of rim of flywheel

a) Face of rim offly wheel

b) Any point onthe peripheryof rim of flywheel

Front edge of thefeed dog

Refto

Fig.

7A

7B

8A

8B

9

10

1IA

llB

12

MaximumAssemblyClearance

mm

0.35

0.20

0.65

0.75

0.20

0.08

0.10

0.25

0.30

0.35

--

The method for carrying out various accuracy tests are given in Annex A.

2

IS 15449 (Part 2): 2004

ANNEX A

(Clause 3)

METHOD OF TESTS

A-1 FEED DOG HEIGHT

For measurement of feed dog height, the flywheel shallbe rotated so as to bring the feed dog to its highestposition above the needle plate. The dial indicator shallbe so set as to accommodate both the top of the feeddog as well as the needle plate surface within its range.At this position, two readings shall be taken, one atthe top of feed dog and the other at the needle platesurface. The difference between these two observationsshall indicate the maximum height of the feed dogabove the needle plate (see Fig. 1).

L!EQLPLATEFIG. 1 FEEDDOG HEIGHT

A-2 SHUTTLES AND SHUTTLE DRIVERCLEARANCE

For measurement of the clearance, between shuttle andshuttle driver the machine shall be held in the inclinedposition. The fly wheel shall be rotated while observingthe relative position of the shuttle and its driver till theshuttle heel comes to the bottom most position. At thisstage, the measurement for clearance between the heelof the shuttle and the corresponding tip of the shuttledriver shall be made by using a feeler gauge. Thisclearance indicates the clearance existing between theshuttle and shuttle driver (see Fig. 2).

A-3 NEEDLE AND SHUTTLE

For measurement of the clearance, between needle andthe corresponding face of shuttle, the machine shallbe held in the inclined position. The flywheel shall berotated while observing the relative position of theneedle and the corresponding face of shuttle, till needlecomes to the bottom most position. At this stage, themeasurement for clearance between the needle and thecorresponding face of the shuttle shall be made by usinga feeler gauge. Thisbetween the needleshuttle (see Fig. 3).

indicates the clearance existingand the corresponding face of

3

—

FIG. 2 SHUTTLESANDSHUTTLEDRIVERCLEARANCE

RIM FACE

FIG. 3 NEEDLEANDSHUTTLECLEARANCE

A-4 PRESSER FOOT GAP

For measurement of the presser foot gap, the presserfoot shall be lifted to its highest position. The gapbetween the bottom face of presser foot and the surfaceof needle plate shall be measured with a suitable gauge.This gap indicates the maximum clearance availablebetween the presser foot and the needle plate of asewing machine (see Fig. 4).

1:

IS 15449 (Part 2) :2004

Lii ●

is=-PLATE

FIG. 4 PRESSUREFOOTGAP

A-5 ZIG-ZAG BIGHT

A-5.1 For measurement of the zig-zag bight width orthe distance between two needle penetrations (in theneedle plate) on the left and right sides respectively,the zig-zag bight knob shall be set at its maximumposition. The feed regulator (FR) thumbscrew shallbe set at zero position or the feed throw out (FTO)knob shall be adjusted to feed drop position (seeFig. 5A).

A-5.2 The flywheel shall be rotated to take the twopenetrations on a piece of paper (instead of cloth),placed between the needle plate and presser foot. Thepaper shall be taken out from the machine and thedistance between the two penetrations measured withthe help of a scale. This measurement shall be the bightof the zig-zag sewing machine (see Fig. 5B).

A-6 DISC FOLLOWER

For measurement of the clearance, between discfollower pin and the highest point of disc No. 1, rotatethe section of panel upwards as shown in Fig. 6. Thefly wheel shall be rotated, while observing the relativeposition of the disc follower pin and the disc No. 1, tillthe needle bar comes to its bottom mosthop mostposition. At this stage, the measurement for clearanceshall be made by using a feeler gauge. Thismeasurement shall indicate the clearance existingbetween the disc follower pin and the highest point ofdisc No. 1 (see Fig. 6).

A-7 NEEDLE BAR

A-7.1 With the bight knob at straight stitch position,move the needle bar to its lowest position and place

6+.● ▼ n

GQT1l-1

FIG. 5A ZIG-ZAGBIGHTWIDTH

5 mm

T

u

M!M!!!LFIG. 5B ZIG-ZAGBIGHT

4

IS 15449 (Part 2): 2004

T! L-JFIG. 6 DISC FOLLOWER

the dial indicator on the top of the needle bar using anextension piece, if necessary. Apply light hand pressureat the bottom of the needle bar to push it up and notethe indicator reading. Similarly, pull the needle bardown with the same pressure and take the secondindicator reading. The difference between the tworeadings shall indicate the assembly clearance forneedle bar in the direction of motion (see Fig. 7A).

A-7.2 With the needle bar to its lowest position andbight knob at straight stitch position places the indicatornear its lower tip by the side of the needle bar. Applysideward light hand pressure forward and backward.Take one reading of the indicator at each of these twopositions. The difference between the two readings

J

LIGHT PRESSURE

FIG. 7A ASSEMBLYCLEARANCEFORNEEDLEBARINTHEDIRECTIONOFMOTION

shall indicate the assembly clearance for needle bar inthe direction of right angle to that of the motion (seeFig. 7B).

A-8 THREAD TAKE UP LEVER

A-8.1 Bring the thread take up lever at its ;op/intermediate/bottom position. Place the indicator abovethe lever around the thread hole. Pull the lever downwith very light hand pressure and note the indicatorreading. Similarly, push the lever up with the samepressure and observe the second reading. Thedifference between the two readings will indicate theclearance in the direction of motion for thread take uplever at its given position (see Fig. 8A).

I

=1LIGHT PRESSURE

FIG. 7B ASSEMBLYCLEARANCEFORNEEDLEBAR INTHEDIRECTIONOFRIGHTANGLETOTHEMOTION

5

IS 15449 (Part 2) :2004

Av

t LIGHT PRESSURE—

FIG.9 SHUTTLE

FxG.8A THREADTAKEUP LEVER

A-8.2 For the clearance in the right angle direction,place the indicator on the sidewall near the thread holeof the take up lever. Apply very light pressure on thetip of the lever forward and backward and take onereading of the indicator at each of these two positions.The difference between the two readings shall indicatethe assembly clearance for thread take up lever in thedirection of right angle to that of the motion (seeFig. 8B).

C \]LIGHT PRESSURE ~ i

-.+.,_. -— -—-—--i -—I

FIG. 8B THREADTAKEUP LEVER(RIGHTANGLE)

A-9 SHUTTLE

Set the indicator on the top of shuttle pin in the axialdirection. Hold the pin and apply very light axial pulland push and take one reading of the indicator at eachof these two positions. The difference between the tworeadings indicates the assembly clearance for theshuttle in the axial direction. An indicator attachmentmay be necessary for this measurement (see Fig. 9).

A-1 OARM SHAFT

Place the indicator in contact with the side face of therim of flywheel at any convenient point. Apply medium

hand pressure and pull and push the flywheel in theaxial direction of the arm shaft. Take one reading ofthe indicator at each of these two positions. Thedifference between the two readings shall indicate theclearance for the arm shaft in the axial direction (seeFig. 10).

rP-=M

PRESSURE

FIG. 10 ARMSHAFTCLEARANCE

A-II FLY WHEEL

A-11.l For determinationof the wobbling of the flywheel,bring the indicator in contact with the side face of the rimof the fly wheel. Rotate the flywheel by at least onerevolution and note thq total difference in indicatorreading. This reading will indicate the wobbling of theflywheel in the axial direction (se-eFig. 11A).

A-1 1.2 For determination of the eccentricity of theflywheel, bring the indicator in Contact with thecircumference of the flywheel. Rotate the flywheel byat least one revolution and note the total difference inindicator reading. This reading will indicate theeccentricity of the flywheel in the radial direction (seeFig. 1lB).

A-12 FEED DOG SECTION

For measurement of the feed dog section, the flywheel

6

I

IS 15449 (Part 2) :2004

—.

[ ““l

FIG. 11A FLYWHEEL(WOBBLING)

shall be rotated so as to bring the feed dog to its highestposition above the needle plate. The dial indicator shallbe set on the front edge of the feed dog, The maximum

I

FIG. 11B FLYWHEEL(ECCENTRICITY)

feed amount shall be measured with dial indicator inthe direction of motion (see Fig. 12).

~DIRECTION OF MOTION

FIG. 12 FEEDDOG SECTION

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

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Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by refen-ing to the latest issue of‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Doc : No. ME 29 (0642).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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