1、Designation: D6673 10Standard Practice forSewn Products Pattern Data InterchangeData Format1This standard is issued under the fixed designation D6673; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A num
2、ber in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This standard is designed to facilitate communicationbetween CAD/CAM systems that represent two-dimensionalflat pattern pieces. This stand
3、ard also provides conventions forrepresenting related information such as grade rule tables. Thisstandard is not intended to represent the relationships betweenpattern pieces or the correspondence between 2D or 3D sewnproduct pattern piece geometries.1.2 The file format for the pattern data exchange
4、 file definedby this standard (Practice D6673) complies with the DrawingInterchange File (DXF) format. Autodesk, Inc. developed theDXF format for transferring data between their AutoCAD(r)product and other software applications. This standard docu-ments the manner in which pattern data should be rep
5、resentedwithin the DXF format. Users of this standard should haveAutodesk, Inc.s documentation on Drawing Interchange Files,found in the AutoCAD Reference Manual, in order to assurecompatibility to all DXF format specifications. The AutoCADVersion 13 DXF specification is to be used. The file format
6、forthe grade rule table exchange file is an ASCII text file.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-b
7、ility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D6963 Terminology Relating to Sewn ProductsAutomation2.2 ANSI/AAMA Standard:ANSI/AAMA-292A3. Terminology3.1 Definitions of Terms Specific to This Standard: For allterminology related t Sewn Porducts Automation see
8、 Termi-nology D6963.3.1.1 alternate grade reference line, nan optional internalline whose orientation is used for the x axis of a grade rule.3.1.1.1 DiscussionThe application of a grade rule will beoriented to the grade reference line unless an alternate gradereference line is specified. (See grade
9、reference line.)3.1.2 base size, nthe digitized or created size of a style.3.1.2.1 DiscussionBase size is a synonym of sample size.(See sample size.)3.1.3 block, na DXF keyword that is used to identify asection of the file that has information about one object.3.1.3.1 Discussiona block keyword shoul
10、d be used toidentify the start of information for a pattern piece and thesection should be ended with an endblk keyword.3.1.4 internal cut outs, nlines, part of a pattern piece, notpart of the piece boundary, which are cut during the cuttingprocess.3.1.5 internal lines, nlines, part of a pattern pie
11、ce, not apart of the piece boundary, which are not cut.3.1.5.1 DiscussionInternal lines are not cut but may bedrawn during the cutting process.3.1.6 sew lines, ninternal lines that indicate where stitch-ing of pattern pieces is to be done.3.23.2.1 entities, na DXF keyword that is used to identify th
12、esection of the DXF file describing file identification informa-tion.3.2.1.1 DiscussionStyle system text must be placed in theentities section of the DXF file.3.2.2 system text, ninformation related to either the styleand/or pattern pieces in the DXF file.3.2.3 system text identifier, nkeywords used
13、 in DXF fileto construct syntax and associate values with specific systemtext.3.2.5 validation vertex, nvertex that is inserted into apolyline in order to guarantee that the resulting polylinerepresents the original curve in the exporting CAD systemswithin a given curve tolerance4. Summary of Practi
14、ce4.1 Pattern Piece Transfer File FormatThe file formatdefined by this standard complies with the DXF format.ADXFfile is a specially formatted ASCII text file. It consists of an1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D
15、13.66 on Sewn Product Automation.Current edition approved Jan. 1, 2010. Published March 2010. Originallyapproved in 2001. Last previous edition approved in 2004 as D667304. DOI:10.1520/D6673-04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Unite
16、d States.optional header as well as tables, blocks and entities sections.The tables section allows for user-defined functional layeringof a CAD drawing. Using this provision, this standard orga-nizes the CAD data representing a pattern piece into a numberof layers.This standard currently can incorpo
17、rate the following patternpiece information:annotation (plotted) text;alternate grade reference line(s);cut line;drill holes;graded nests;grade reference line;grade rule identifiers;grade rule table name;grainline;internal cutouts;internal lines;mirror line;notches;piece boundary, including turn poi
18、nts and curve points;plaid reference lines;sew lines;stripe reference lines;style information: style name; creation date and time, author, samplesize, grade rule table name, units, standard version.piece information: piece name, quantity, category, rotation, flip, tilt,fold.4.2 HeaderAn optional hea
19、der may precede the informa-tion in the file defined by this standard. However, becausemany CAD programs on the market today are unable togenerate or accept a header, it is recommended that the use ofthe optional header be minimized.4.3 LayersThe ASTM D13 proposed standard utilizes alayered file for
20、mat. Information contained in the file defined bythis standard is separated into distinct layers, each layerproviding a specific type of information. Layer numbers areused to identify each layer and indicate which information isfound in the layer.Numbers are used, rather that text, since many progra
21、ms thatsupport the DXF format are unable to generate or acceptnon-numeric layer designations. Layer 1 is required. Informa-tion about each layer is described in 4.3.1 through 4.3.15.The following four restrictions are placed on layer informa-tion:(1) On Layer 1 the piece boundary line will be repres
22、ented asone or more polylines that form a closed polygon.(2) Layer 2 will contain all the turn points in the piece asfound on layers 1, 8, 11, and 14.(3) Layer 3 will contain all the curve points in the piece asfound on layers 1, 8, 11, and 14.(4) Layers 5, 6, 7, 9, 10 and 13 cannot contain polyline
23、s.The following list for layer numbers are provided:Layer 1 piece boundaryLayer 2 turn pointsLayer 3 curve pointsLayer 4 V-notch and slit notchLayer 5 grade reference and alternate grade reference line(s)Layer 6 mirror lineLayer 7 grainlineLayer 8 internal line(s)Layer 9 stripe reference line(s)Laye
24、r 10 plaid reference line(s)Layer 11 internal cutout(s)Layer 12 intentionally left blankLayer 13 drill holesLayer 14 sew line(s)Layer 15 annotation textLayer 80 T-notchLayer 81 castle notchLayer 82 check notchLayer 83 U-notchLayer 84 piece boundary quality validation curvesLayer 85 internal lines qu
25、ality validation curvesLayer 86 internal cutouts quality validation curvesLayer 87 sew lines quality validation curves4.3.1 Layer 1Piece Boundary LayerThe piece boundarylayer contains the boundary lines for each piece in the file. Aseparate BLOCK is used for each piece. Within each BLOCKare one or m
26、ore polylines that constitute the piece boundary.Each polyline within the BLOCK corresponds to an individualpattern element.The Piece Boundary BLOCK includes Turn Points, CurvePoints, Notch Base Points, Grade Points and Mirror LinePoints. The piece boundary is a continuous, closed line, withpoints o
27、rdered in either the clockwise or counter clockwisedirection. This layer is required.DXF example of a piece boundary polyline containingvectorized curves:0POLYLINE81 layer 1boundary line661 closed-polyline flag0VERTEX81 layer 1boundary line10450.369 X coordinate20338.697 Y coordinate0VERTEX81 layer
28、1boundary line10459.322 X coordinate20338.316 Y coordinate0VERTEX81 layer 1boundary line10457.195 X coordinate20327.486 Y coordinate0SEQENDDXF example of a piece boundary polyline containingcircular-interpolated curves:0POLYLINE81 layer 1boundary line6617010VERTEX81 layer 1boundary line100.0 X coord
29、inateD6673 102200.0 Y coordinate420.014743 bulge value0VERTEX81 layer 1boundary line1045.900000 X coordinate2053.800000 Y coordinate420.005465 bulge value0VERTEX811034.200000 X coordinate2038.600000 Y coordinate420.018913 bulge value0VERTEX81 layer 1boundary line1019.100000 X coordinate2020.200000 Y
30、 coordinate0SEQEND4.3.1.1 Style System TextIn addition to the piece bound-ary, this layer contains information referred to as required stylesystem text. It only occurs once on this layer in ENTITIES andis assumed to be valid for all pieces in the DXF file.Style information is known as system text. T
31、his text standsin contrast to annotation text, which is plotted out and isdefined as Layer 15 in the DXF file. System text is informationabout the style and/or pieces in the DXF file.The correct syntax for system text is the system textidentifier followed directly by a colon (:) character followeddi
32、rectly by a string of text representing the actual value of theidentifier. Identifiers can be formed from upper or lower casecharacters but must appear as specified in this standard. Thevalue of the identifier is case sensitive and can includecharacters from the following ASCII 7-bit character subse
33、t,including the space character ( ) as well:! 9 #$%?ABCDEFGHIJKLMNOPQRSTUVWXYZ_8abcdefghijklmnopqrstuvwxyz|In some cases, the values of identifiers must have a specificformat or value.To avoid a loss of information, all values of identifiers mustappear in the DXF file as they appeared in the exporti
34、ng CADsystem. Importing CAD systems should warn the user if thevalue of an identifier is being truncated on importing, resultingin a loss of information.Style System Text Correct Syntax (Identifier:)style name Style Name:creation date Creation Date:creation time Creation Time:author Author:;sample s
35、ize Sample Size:Style System Text Correct Syntax (Identifier:)grade rule table Grade Rule Table:units Units:Standard Version ASTM/D13Proposal 1 Version: XXcurve tolerance Curve Tolerance:If the style being transferred has no sample size or grade ruletable (as is the case in non-apparel sewn products
36、), then thevalues of these system text identifiers can be left blank but thesystem text identifier is still required.METRIC means that all values are in decimal millimeters totwo places (e.g. 12.27) and ENGLISH means that all values arein decimal inches to four places (e.g. 4.8751).The appropriate f
37、ormat for Creation Date is and for Creation Time it is .The curve tolerance system text must exist and only existswhen Quality Validation Curves are used in the file. Thetolerance value is represented using the units that have beendefined. The curve tolerance is defined mathematically as themaximum
38、projected distance of a vertex from a polyline on aQuality Validation Layer to the associated original curve (ascalculated by the exporting system). It should be used by areceiving/importing system to determine accuracy of the gen-erated curve (based on the turn points on layer 2 and the curvepoints
39、 on layer 3) to the original curve. Alternatively, thequality validation curve can be used directly to regenerate theoriginal curve in polyline representation.DXF example of system text:TEXT81723100.000200.000110.004210.000400.394500.0001Style Name: SHIRT04.3.1.2 Piece System TextThis is system text
40、 that appearswithin each piece BLOCK:Piece System Text Correct Syntax (Identifier:)Piece Name Piece Name:Quantity Quantity:Rotation Rotation:Flip Flip:Tilt Tilt:Fold Fold:Material Material:Only Piece Name is required.Quantity will be given as R, L where R indicates the numberof right pieces required
41、 and L indicates the number of leftpieces required. (Example 3,2)Rotation is given in step increment degrees. It is assumedthat the piece may rotate in this step increment up to 360degrees.D6673 103Flip is defined as X (assuming flipping the piece about thehorizontal axis) or Y (assuming flipping th
42、e piece about thevertical axis.Tilt is an integer value that defines the maximum tilt indegrees that a piece may move. It is further assumed that thepiece may be tilted positively or negatively up to the maximumdefined tilt.Fold indicates that the piece may be placed on the fold oftubular fabric.Mat
43、erial is a string giving the name of the material in whichthe piece is cut.4.3.1.3 Piece ArrangementWhen multiple pieces are con-tained within a single file defined by this standard each pieceshall be defined within a separate BLOCK. The BLOCKdescription must not contain any INSERT operations of oth
44、erblocks.Although multiple pieces are allowed within the file only asingle style may be represented.4.3.1.4 Grade Rule Identifier TextGrading information isidentified by text within the sample size block on layerscontaining graded points or notches. Grade information con-tained in the text entity is
45、 associated with a point or vertexentity at the same XY location. The format for this informationis as follows:# , where # is required and followed by which is thegrade rule identifier, is optional and can be used asthe alternate grade reference identifier.Any point or notch that will not be moved t
46、hrough gradingmust have a grade rule identifier associated with a zero growthgrade rule.The following layers can not include grade rules:- 2 (turn point)- 3 (curve point)- 6 (mirror line)- 84 (boundary quality validation curves)- 85 (internal lines quality validation curves)- 86 (internal cutouts qu
47、ality validation curves)- 87 (sew lines quality validation curves)The grade rules associated with grade rule identifier mayoptionally be defined in a separate file called a Grade RuleTable File.4.3.1.5 Graded NestsAgraded nest can be used to transfergrading growth information for pieces. Multiple bl
48、ocks withina DXF file with the same piece name will indicate a gradednest.Each graded size of a piece must be defined in a separateblock with the size name of the piece included in the piecesystem text. The order of the BLOCKS represents the sequenceof the sizes. Each block must contain a grade refe
49、rence line.The growth information can be determined by stacking thepieces so the grade reference lines are coincident.Only the sample size must have all of the piece system textfor the piece. All points and ATTDEF entities must be repeatedin each block (i.e. each size) of the nest. Points and ATTDEFentities for each graded size are given in the same order,quantity and layer as the sample size.Blocks in the DXF file can be placed on top of each other(i.e. to show stacks of graded patterns) or placed separately intheir own coordin
