US3815217A - Method of and apparatus for accurately mounting bits in engraving tools for electronic printing form engraving machines - Google Patents

Method of and apparatus for accurately mounting bits in engraving tools for electronic printing form engraving machines Download PDF

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Publication number
US3815217A
US3815217A US00342209A US34220973A US3815217A US 3815217 A US3815217 A US 3815217A US 00342209 A US00342209 A US 00342209A US 34220973 A US34220973 A US 34220973A US 3815217 A US3815217 A US 3815217A
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US
United States
Prior art keywords
bit
mounting member
holder
supporting
engraving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00342209A
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English (en)
Inventor
W Baar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hell R dt GmbH
HELL R GmbH
Original Assignee
HELL R GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HELL R GmbH filed Critical HELL R GmbH
Application granted granted Critical
Publication of US3815217A publication Critical patent/US3815217A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B1/00—Artist's machines or apparatus equipped with tools or work holders moving or able to be controlled three-dimensionally for making single sculptures or models
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49895—Associating parts by use of aligning means [e.g., use of a drift pin or a "fixture"]

Definitions

  • ABSTRACT A preground engraving tool bit is first accurately positioned relative to a mounting member, then secured to the mounting member for handling, and with the aid of the mounting member finally operationally united with a tool holder. All this is accomplished with extreme accuracy in a simple, efficient device especially devised for making such engraving tools for electronic printing form engraving machines.
  • This application relates to a method of and apparatus for accurately mounting bits in tool holders, and is more particularly concerned with producing engraving tools for electronic printing form engraving machines.
  • the engraving tools are controlled electronically, that is, by electrical signals effected by electro-optic sensing of printing patterns in a dot-bydot and line-by-line according to a screen the pattern of which must be accurately reproduced on the printing form.
  • the tone value detected during the sensing process more or less material is engraved from the surface of a raw printing form by means of the engraving tool.
  • the recesses produced in this way are called screen components or small dish recesses in the following description, and such recesses must be quite accurately arranged as to respective positions and must be quite accurately engraved with respect to their shapes, because the human reading eye will be bothered by irregularities in the printed material produced from printing forms in which the position and shape of the screen components or small dish recesses are inexact.
  • An important object of the present invention is to overcome the foregoing and other disadvantages, deficiencies, inefficiencies, shortcomings and problems in prior methods and apparatus and to attain important improvements, advantages, and new and improved results in the mounting of cutting bits in engraving tool holders.
  • Another object of the invention is to provide a method of and means for the production of engraving tools for electro-mechanical engraving of printing forms attaining the required precision and thorough attachment of the cutting bit whereby to assure accuracy in the engraving of printing surface recesses.
  • a further object of the invention is to provide a new and improved method of and means for accurately and with precision uniting pre-ground cutting bits with holders in the production of engraving tools.
  • Yet another object of the invention is to provide a new and improved method of and-means for mounting engraving tool bits with holders in two steps attaining extreme accuracy.
  • FIG. 1 is a schematic representation of a printing cylinder surface and an engraving tool to' show how such a tool operates in service.
  • FIG. 2 is an isometric view of a pre-ground cutting bit.
  • FIG. 3 is an isometric view of a device for attaching the cutting bit to an intermediate mounting member.
  • FIG. 4 is a perspective view of a device for effecting final mounting of the cutting bit with a tool holder.
  • FIG. 5 is a perspective view of a modified device for final reassemblying the cutting bit with the holder.
  • a fragment of the surface of a printing cylinder 1 is illustrated in FIG. 1 and which during engraving rotates in the direction of the arrow 2 at a uniform circumferential speed.
  • Printing ink receiving screen components or small dish recesses 3 are formed in the printing surface by an engraving tool bit 7 so positioned adjacent to the printing surface of the cylinder 1 that its cutting tip 5 will form the recesses 3 in controlled vibrating or oscillating movements of the tool as indicated by the directional arrow 4. It will be understood that the engraving tool 7 as schematically illustrated in FIG.
  • the engraving tip 7 penetrates the surface of the printing cylinder 1 approximately 4,000 times per second. In the relative rotation of the printing cylinder 1 the tip 7 will therefore follow a relative operating path generally indicated by the dash line 6.
  • the cutting bit 7 which, for example, may be prismatically ground diamond with its cutting tip 5 formed by faces bounded by edges 8, 9 and 10 and which are properly related to longitudinal reference surfaces of the bit identified as l2, l3, l4 and 15 for attaining the exact position of the bit in its holder.
  • the bit 7 is secured in a holder at the reference surfaces 12, 13 and 14 and the tip 5 will remove material on penetrating the surface of the printingcylinder to produce the small dish shaped recesses 3.
  • These small recesses 3 serve to receive the printing ink during the printing process and must be precisely formed such as to an exactness of approximately 1/2 micron in dimensions and in position with respect to the other recesses in order to obtain perfect printing reproduction.
  • precision is demanded with respect to its cutting tip 5, its mounting within the engraving system, and the operating stroke.
  • Accurate mounting of the cutting bit 7 in a tool holder is accomplished according to the present invention in two steps by first exactly orienting it with respect to an intermediate mounting member to which it is temporarily attached, and secondly with the aid of the intermediate mounting member assemblying the bit with a holder in a precise relation to unite the bit with the holder.
  • Apparatus for the purpose is provided with precisely finished and related reference or guide sur faces to be engaged by the cutting bit in the course of effecting mounting thereof.
  • a device 16 (FIG. 3) is provided to accomplish the first step in mounting the bit 7.
  • This device has reference or guide surfaces for the bit 7 comprising a flat surface 17 against which the longitudinal surface 12 of the bit is engaged in face-toface relation and with the cutting tip engaged firmly against a gauge surface 18 extending angularly relative to the surface 17 and joining the surface 17 at a reentrant angle joint 19.
  • an intermediate mounting member 21 longitudinally shiftably guided in a groove 20 parallel to and spaced from the gauge surface 18 and the juncture 19 a proper distance is positioned for engagement with the bit in a manner to properly gauge the length to which the cutting tip 5 of the bit 7 should project from a tool holder with which the bit will ultimately be assembled.
  • the intermediate holder 21 For engagment with the bit 7, the intermediate holder 21 has a contactsurface 22 at its front end which is-placed in face-to-face engagement with the proper longitudinal guide surface on the bit which is disposed angularly to the guide surface 17, herein the surface on the bit.
  • the angle between the guide surface 22 and the guide surface 18 should be proper for the desired inclination of the longitudinal axis of the cutting bit with respect to the surface which must be engraved.
  • the surface 15 In assemblying the bit 7 with the intermediate mounting mebmer surface 22, the surface 15 is pressed against the surface 22 with a suitable adhesive therebetween to hold the bit to the surface 22 against displacement while the second step in assembly with a tool holder is effected.
  • the device 23 includes means in this instance comprising a block, similarly as the device 16 comprises a basic block, having a longitudinal groove or guideway 24 in which the elongated intermediate mounting member 21 is received, similarly as it is received in the groove of the device 16 accept in the device 23 the bit 7 as carried by the member 21has the tip 5 directed toward a surface 29 which corresponds substantially to the surface of a printing cylinder.
  • the surface 29 serves as a gauging surface to be sure that the bit tip 5 is accurately placed.
  • the bit 7 is placed into a mounting recess 27 provided therefore in one end of the holder 26.
  • Correct positioning of the holder 26 with the recess 27 at the proper elevation above the surface 29 to receive the bit 7 is effect by supporting the holder fixedly upon a support 25 provided for this purpose on the device 23.
  • the cutting bit 7 is positioned correctlyin the recess 27.
  • suitable demarcation stops may be provided or a microscope 28 associated with the device 23 may be utilized for visually ascertaining that the assembled relationship uniting the bit with the holder is properly accomplished, in view of the small size of the parts.
  • the bit 7 As assembled with the holder 26, the bit 7 is fixedly secured by suitable means such as soldering, sintering, bonding by means of cold or heat hardening plastic bonding adhesives, or other means or even clamping. This assures that the bit 7 will be held quite effectively against displacement relative to the holder 26 in-use, with the longitudinal surfaces 12, 13 and 14 of the bit engaged with opposing surfaces in the recess 27 of the holder.
  • the intermediate mounting member 21 is released at its carrying surface 22 from the bit and the holder 26 is removed from the device 23 for mounting in an engraving machine.
  • a support for the holder 26 similar to the support 25 is provided but in which the holder support is oscillatable by means of an electrically controlled magnetic system.
  • the arrangement may comprise having the mounting member 21 project to a fixed extent over the surface 29a and there hald against reciprocable movement as by means of pins 32 and 33.
  • the holder 26 is supported by a fixed support 25a mounted on a reciprocably movable member 30 longitudinally slidably shiftable in a guide track 31 of the member 23a parallel with the groove 24a in which the intermediate mounting member 21 is mounted.
  • the carriage block 30 is shifted in its track 31 toward the intermediately supported bit 7 until the bit is received within the complementary recess 27 of the holder.
  • an index mark on the support 25a or a specially provided reference edge on the holder 26 may be provided on which the microscope can focus.
  • the support 25 or 25a for the holder 26 is generally simulative of the corresponding support in the engraving machine in its neutral position, it will be appreciated that once the bit 7 has been mounted in the holder 26 pursuant to the present method and with the aid of the present apparatus, a high order of efficiency, accuracy and maximum utility are provided in the engraving tool unit. By the grinding and gauging of the bit during the assembly steps proper cutting tip length projecting of the bit beyond first the intermediate holder 21 and then beyond the supporting portion of the holder 26 are attained.
  • a method according to claim 2 including moving said intermediate mounting member in a guide groove and thereby guiding the member along said guide surface toward said bit.
  • a method according to claim 1, comprising holding the tool holder stationary and moving the intermediate mounting member to assemble the bit in said complementary recess.
  • a method according to claim 1, comprising the holding said intermediate mounting member stationary and moving said holder to receive said bit in said complementary recess.
  • a method according to claim 1, comprising facing three angularly related longitudinal surfaces of said bit in face-to-face abutment with three complementary surfaces in said recess, and fixedly securing the bit in said recess.
  • said supporting means for the cutting bit comprising a guide surface for supporting one side of the bit and a gauging surface located angular to the guiding surface.
  • Apparatus according to claim 8 including means for holding the holder in a fixed position and said mounting member being mounted for movement toward the holder to insert the bit in the complementary recess of the holder.
  • Apparatus according to claim 13 including means for holding the mounting member stationary relative to the holder, and means for moving the holder toward the bit carried by the member for receiving the bit in said recess of the holder.
  • Apparatus according to claim 8 including means for observing accuracy of assembly of the bit with the holder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Milling Processes (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Jigs For Machine Tools (AREA)
US00342209A 1972-03-22 1973-03-16 Method of and apparatus for accurately mounting bits in engraving tools for electronic printing form engraving machines Expired - Lifetime US3815217A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE722213768A DE2213768C3 (de) 1972-03-22 1972-03-22 Verfahren und Vorrichtung zum ortsgenauen Einsetzen eines Schneidorganes zur Herstellung eines Gravierstichels für elektronische Druckform-Graviermaschinen

Publications (1)

Publication Number Publication Date
US3815217A true US3815217A (en) 1974-06-11

Family

ID=5839684

Family Applications (1)

Application Number Title Priority Date Filing Date
US00342209A Expired - Lifetime US3815217A (en) 1972-03-22 1973-03-16 Method of and apparatus for accurately mounting bits in engraving tools for electronic printing form engraving machines

Country Status (15)

Country Link
US (1) US3815217A (xx)
JP (1) JPS535562B2 (xx)
BE (1) BE796911A (xx)
CA (1) CA983690A (xx)
CH (1) CH551296A (xx)
DD (1) DD102963A5 (xx)
DE (1) DE2213768C3 (xx)
DK (1) DK141719C (xx)
FR (1) FR2177392A5 (xx)
GB (1) GB1430622A (xx)
IT (1) IT980634B (xx)
NL (1) NL160758C (xx)
SE (2) SE405464B (xx)
SU (1) SU544360A3 (xx)
YU (1) YU35079B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000043203A1 (de) * 1999-01-25 2000-07-27 Heidelberger Druckmaschinen Ag Gravierorgan

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1225163A (en) * 1984-02-22 1987-08-04 Gila River Products, Inc. Method and apparatus for laminating flexible printed circuits
DE10028055A1 (de) * 2000-06-06 2001-12-20 Rudolf Reese Verfahren zum Betreiben eines elektromechanischen Gravursystems
CN103978821B (zh) * 2014-05-28 2016-06-22 北京沃尔德超硬工具有限公司 一种用于石材雕刻的双刃金刚石刀具

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131464A (en) * 1962-10-18 1964-05-05 Boeing Co Assembly machine
US3165834A (en) * 1961-02-08 1965-01-19 Ct Circuits Inc Layout table and coordinate reader
US3324759A (en) * 1961-03-09 1967-06-13 Linotype Machinery Ltd Registration of printing elements on printing presses
US3578868A (en) * 1967-09-15 1971-05-18 Gildemeister Werkzeugmasch Apparatus for facilitating precision mounting of tools in tool holders
US3600815A (en) * 1967-09-15 1971-08-24 Index Werke Kg Hahn And Tessky Setting arrangement for facilitating the positioning of cross-slides in machine tools for treatment of round workpieces
US3642269A (en) * 1970-10-05 1972-02-15 Blaine K Ladd Bench jig for skis
US3651401A (en) * 1970-04-09 1972-03-21 Pylon Co Inc Article locating and positioning apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3165834A (en) * 1961-02-08 1965-01-19 Ct Circuits Inc Layout table and coordinate reader
US3324759A (en) * 1961-03-09 1967-06-13 Linotype Machinery Ltd Registration of printing elements on printing presses
US3131464A (en) * 1962-10-18 1964-05-05 Boeing Co Assembly machine
US3578868A (en) * 1967-09-15 1971-05-18 Gildemeister Werkzeugmasch Apparatus for facilitating precision mounting of tools in tool holders
US3600815A (en) * 1967-09-15 1971-08-24 Index Werke Kg Hahn And Tessky Setting arrangement for facilitating the positioning of cross-slides in machine tools for treatment of round workpieces
US3651401A (en) * 1970-04-09 1972-03-21 Pylon Co Inc Article locating and positioning apparatus
US3642269A (en) * 1970-10-05 1972-02-15 Blaine K Ladd Bench jig for skis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000043203A1 (de) * 1999-01-25 2000-07-27 Heidelberger Druckmaschinen Ag Gravierorgan
US6736035B1 (en) 1999-01-25 2004-05-18 Hell Gravure Systems Gmbh Engraver

Also Published As

Publication number Publication date
SE405464B (sv) 1978-12-11
GB1430622A (en) 1976-03-31
SU544360A3 (ru) 1977-01-25
CH551296A (de) 1974-07-15
DD102963A5 (xx) 1974-01-05
DE2213768B2 (de) 1978-06-29
BE796911A (fr) 1973-07-16
CA983690A (en) 1976-02-17
JPS4914201A (xx) 1974-02-07
DK141719B (da) 1980-06-02
YU35079B (en) 1980-09-25
NL160758C (nl) 1979-12-17
DE2213768A1 (de) 1973-10-04
NL7303896A (xx) 1973-09-25
FR2177392A5 (xx) 1973-11-02
SE431074B (sv) 1984-01-16
NL160758B (nl) 1979-07-16
IT980634B (it) 1974-10-10
JPS535562B2 (xx) 1978-02-28
DE2213768C3 (de) 1979-03-08
SE7804838L (sv) 1978-04-27
DK141719C (da) 1980-10-27
YU70473A (en) 1980-03-15

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