US3881888A - Fixture for holding blades during grinding - Google Patents

Fixture for holding blades during grinding Download PDF

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Publication number
US3881888A
US3881888A US375718A US37571873A US3881888A US 3881888 A US3881888 A US 3881888A US 375718 A US375718 A US 375718A US 37571873 A US37571873 A US 37571873A US 3881888 A US3881888 A US 3881888A
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US
United States
Prior art keywords
chuck
edge
bolt
clamping
cutting element
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
US375718A
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English (en)
Inventor
Martin Schwab
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.)
Wilhelm Maier und Soehne OHG
Original Assignee
Wilhelm Maier und Soehne OHG
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Publication date
Application filed by Wilhelm Maier und Soehne OHG filed Critical Wilhelm Maier und Soehne OHG
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Publication of US3881888A publication Critical patent/US3881888A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies

Definitions

  • ABSTRACT A fixture for positioning a sewing machine cutting element in a grinding machine.
  • a horizontally disposed bolt or shaft is carried by a grinding machine attachment mounting.
  • a clamping plate is rotatably and longitudinally positionable on the shaft at selected positions along the axis thereof.
  • a second bolt or shaft extends from the clamping plate, at right angles to the first shaft and is securable at selected angular and longitudinal positions with respect to its own axis.
  • the second bolt has mounted at its end a chuck adapted to secure the sewing machine cutting element.
  • the clamping plate can thus be adjusted with respect to the first and second bolts so that the sewing machine blade can be held at selected positions with respect to the cutting device of the grinding machine.
  • the present invention relates to a fixture or jig for positioning and holding the cutting elements of a sewing machine with respect to the grinder of a grinding or graving machine.
  • the graver or grinding machines by which the cutting elements are ground in general has a fixed grinding plane.
  • Special jigs or clamping devices have been provided to hold sewing machine cutting elements.
  • These fixtures consist of a machine attachment mounting and a plate like chuck having one or more clamping claws or clamping elements.
  • the attachment mounting enables the chuke plate to be always fixed in a preset position with respect to the plane of the grinding device of the grinding machine.
  • the chuck plate is provided with a guide which matches the similar guide of the sewing machine cutting element. This guide takes into account the predetermined angle for the cutting element blade and permits the blade to be accurately ground. This requires, however. that a clamping device adapted to each individual sewing machine cutting element be provided. In view of the large number ofdifferent sewing machine cutting elements this represents an unacceptable burden in both the manufacture and storage of these elements.
  • a fixture for positioning a sewing machine cutting element in a grmdlng machine which comprises a horizontally disposed bolt or shaft carried by a grinding machine attachment mounting.
  • a clamping plate is rotatably and longitudinally positionable on the shaft at selected positions along the axis thereof.
  • a second bolt or shaft extends from the clamping plate. at right angles to the first shaft and is securable at selected angular and longitudinal positions with respect to its own axis.
  • the second bolt has mounted at its end a chuck adapted to se cure the sewing machine cutting element.
  • the clamping plate can thus be adjusted with respect to the first and second bolts so that the sewing machine blade can be held at selected positions with respect to the cutting device of the grinding machine.
  • the clamping device according to the present invention thus can perform adjustably the functions of any well known clamping device which is specifically designed for a given individual cutting element but it overcomes the drawback of these conventional devices in that only a single device consisting of the same parts can be used for any cutting element.
  • the device according to the present invention may he prefabricated and stored by the grinder for use with any cutting element. Matching the device to a predetermined sewing machine cutting element is purely a matter of adjustment of the angular and longitudinal position of the clamping plate with respect to the first and second bolts. This adjustment need only be done once for each particular sewing machine cutting element.
  • the present device affords the further advantages that adjustment to another sewing machine cutting element is eas' ily obtainable and quite feasible without the necessity of fabricating additional parts.
  • the machine attachment mounting is subdivided into a base portion and a block portion which are connected together by a third bolt or shaft extending at right angles to the first bolt or shaft.
  • the plate chuck can then be adjustable in all three coordinate planes with respect to the grinding device.
  • the first bolt. that is the bolt connecting the attachment member and the clamping plate extends horizontally while the third bolt which connects the base and the clamping block of the attachment mounting extends vertically thereto.
  • the base of the attachment mounting body is made bifurcated so that the device as a whole can be adjusted longitudinally and angularly with respect to the grinding device by easily attachable and detachable clamping members.
  • the first bolt on which the clamping plates are secured is made sufficiently long so that it extends from the body of the attachment mounting so that several clamping plates may be rotatably and longitudinably mounted thereon.
  • Each clamping plate contains an associated chuck each receiving one of the cutting elements. lt may be further preferred to provide the bolt protruding on both sides of the body of the mounting member so that clamping plates and associated chucks may be mounted symmetrically with respect to the attachment mounting.
  • Securement of the attachment mounting and/or the clamping plates is achieved according to the preferred form of the present invention by extending the shafts through a bore which bore is provided with a slot extending to the edge of its member so that the bore may be compressed or clamped resiliently. Associated clamping screws or locking bolts are provided so that the member may tighten the bore about the bolt in its selected position.
  • the present invention further provides for an increased ntnnbcr of possibilities of fixing the sewing tittichine cutting elements themselves to the chuck plates.
  • the chuck plate is provided with a plurality of stepped clamping surfaces each provided with a stop edge.
  • the cutting elements may thus be positioned on any one of the multiple stepped surfaces.
  • the cutting elements are clamped to the clutch plate by a top plate or claw which is fixed to the plate chuck by screw means.
  • the top plate is provided with an oblong hole through which the screw means extend so that it too may be adjustably positioned.
  • Guide pins and coordinated guide slots are provided by which the exact movement of the chuck plate and the top claw plate can be made with respect to each other.
  • FIG. I is an isometric view of the grinding machine attachment mounting body showing the horizontal first bolt.
  • FIG. 2 is an isometric view of the clamping plate which is received on the first bolt and which itself receives the chuck.
  • FIG. 3 is an isometric view'of the bottom portion of the chuck and the second bolt.
  • FIG. 4 is a similar view showing the top plate or clamping claw and means for attachment to the bottom portion of the chuck.
  • FIG. 5 shows the device in its assemble configuration.
  • the device comprises a grinding machineattachmentmounting consisting of a bifurcated mounting base 15. the parallel legs of which define a bight or slot I6.
  • the base can be easily and rapidly set tip on the conventional guide shoulders of the commonly employed gravcr or grinding machine with well known clamping devices. Although a certain coordination between the grinding plane and the grinding disc or grinding member itself must be maintained and properly respected. this does not proyide any difficulty since the bifurcated base member does not depart significantly from the manner in which conventional fixtures are presently mounted.
  • the bolt I4 extends through a bore in the block II. which bore is proiidcd with a transverse slot I2 extending outwardly toward an edge thereof.
  • a clamping screw 13 Extending transversely through the block 11 is a clamping screw 13 which when tightened clamps the block 11 about the bore in which the bolt I4 is retained.
  • the size ofthe slot 12 and the nature of the material from which the block II is formed determines the resilient degree to which the bolt 14 can be held.
  • Fixed within the block 11 at an axis at right angles to the bolt 14 as indicated by the axis Y. is the first mounting bolt 10.
  • the block 11 and the first bolt 10 mounted in it are thus rotatable about the X axis of the bolt I4 as indicated by the arrow.
  • the clamping screw I3 By tightening the clamping screw I3 the block 11 can be locked and secured in any selected adjustable angular position and linear position with respect to the bolt 14 as desired.
  • clamping plates as seen in FIG. 2 can be thus slit over the horizontally extending first mounting bolt I0. While only one such clamping plate is shown it will be obvious that each can be constructed in exactly the same manner.
  • the clamping plate 20 has a horizontally directed bore 21 which is itself provided with an associated clamping slot 22 extending to its edge and a transversely extending clamping screw 23 similar to that of the clamping screw I3. Through this type of mounting. the clamping plate can be adjustably positioned along the axis of the bolt I0 and fixed in any angular position rotatable about the axis Y as indicated by the arrow.
  • the clamping plate 20 is further provided with a second bore extending at right angles to the bore 21 and thus at right angles to the axis of the bolt 10.
  • the bore 30 is also provided with a clamping slot 3] and a clamping screw 32 by which it may be tightened in the manner previously described.
  • the bore 30 is adapted to receive a second adjustment or mounting bolt 4I which is secured to the bottom portion of a plate chuck as seen in FIG. 3.
  • the bottom portion of the chuck 40 can thus be adjusted angularly as well as longitudinally with respect to the bolt 41 about the axis 2 as indicated in FIG. 2 and then locked in position with respect to the clamping plate 20 by manipulation of the clamping screw 32.
  • the chuck 40 can therefore be adjusted as desired and as selected in all three coordinate directions corresponding to the X. Y. and Z axes and locked in position so that any predetermined disposition and angle with respect to the plane of the grinding element can be obtained for the cutting element mounted on the chuck.
  • the sewing machine cutting element or blade which is to be ground is set upon the lower portion of the chuck 40 and is clamped thereto by a top plate or claw member 50 as seen in FIG. 4.
  • the lower portion of the chuck 40 is stepped at least twice in depth as shown to provide clamping surfaces and 47 which are in parallel planes to each other.
  • Each of the stepped clamping surfaces 45 and 47 is terminated along one edge with a perpendicularly extending wall 44 and 43 respectively extending transversely across the surface.
  • edges 44 and 43 act as clamping stop members against which the cutting element or blade maybe positioned.
  • a threaded bushing -12 into which a thumb screw member 59 passes.
  • the shaft of the thumb screw 59 passes through an oblong hole 53 in the clamping claw or top plate 50 permitting the top plate to be thus longitudinably adjustable with respect to the bottom portion of the chuck.
  • the front edge 51 of the top plate or claw S0 is bent downwardly to provide a stop surface 52.
  • the opposite or rear edge of the top plate is bent upwardly to form a wall I57 which provides the working edge or control edge of the clutch.
  • Projecting downwardly near the front edge 51 is a blade pressure pin 54.
  • the pressure pin 54 is received in a guide slot 48 which is cut within the bottom portion of the chuck transversely to the clamp stop edge 43.
  • a second depending adjustable screw pin 53 Aligned with the pressure pin 54 but along the rear edge is a second depending adjustable screw pin 53 which protrudes downwardly from the lower surface of the top plate 50.
  • the screw pin is movably received in a guide slot 46'cut transversely through the lower step from the rear edge of the bottom portion of the chuck 40.
  • the sewing machine cutting element or blade which is to be ground is placed with one edge against the front clamp stop wall 43 on the upper step 47 of the lower member of the chuck 40.
  • the clamping claw or top plate 50 is guided by the oblong hole 53 until the cutter pressure pin 54 rests on the free edge of the sewing machine cutting element or blade which is to be ground.
  • the cutting blade or cutting element is held between the pressure pin 54 and the stop edge 43 resting upon the flat horizontal surface 47 of the lower chuck member 40.
  • This linear adjustment can be obtained by forcing the clamping member 50 in the forward direction by manually engaging the working edge 57. Thereafter the thumb screw 59 is tightened forcing the top plate or claw 50 into tight position holding the blade.
  • edge 51 of the top plate thus bears downwardly upon the cutting element or sewing machine blade holding the same in fixed position.
  • the pressure pin 54 and the bearing edge 51 guarantees a definite and non-movable tolerance-free setting up of the sew-ing machine cutting element to be ground so that the cutting edges are always ground at the proper predefined and preset angle. Adjustment of the chuck about the X. Y and X axes can thereafter follow so that the cutting element is presented to the grinding mentber or grinding disc in its proper position.
  • the screw pin at the rear of the top plate or claw makes possible the horizontal alignment of the claw 50 when the bearing surface 5l rests on the sewing machine cutting elemcnt or blade.
  • the top plate or clamping claw 50 maybe adjusted transversely to the clamping stops 43 and 44 of the plate chuck 40.
  • a sewing machine cutting element or blade can be made to rest against the clamp stop 44 and held against the flat horizontal surface-45.
  • the set up proceeds in the same manner as previously described when the blade is positioned against the forward edge 43.
  • the present invcntion provides a simple fixture of jig for holding the cutting element or blade for grinding.
  • the chuck which actually holds the blade is adjustable about a first axis (til defined by the bolt 10 and simultaneously about a second axis perpendicular thereto defined by the bolt 14.
  • the split clamping blocks and the clamping screw mechanisms provide for easy and simple adjustment without the neccssity of completely taking the device or apparatus apart or without the necessity of substituting or replacing parts.
  • a novel and simple chuck member is provided whereby a variety of cutting elements or blades may be accommodated and which providesfor a secure but adjustable pressure mounting and holding of the blades in their proper position.
  • a fixture for positioning the cutting element of a sewing machine for grinding on a grinding machine comprising an attachment body having a base adapted to be secured in a fixed position on said grinding machine. a first shaft fixed thereon. a separable block sccurable in selected angular and axial positions on said first shaft. a first bolt carried by said block extending along an axis perpendicular to said shaft. a clamping plate securable in selected angular and axial positions on said first bolt. a chuck for holding said cutting element. a second bolt integral with said chuck securable in said clamping plate in selected angular and axial positions along an axis perpendicular to the axis of said first bolt.
  • said chuck comprising a bottom portion having a plurality of stepped planar surfaces perpendicular to said second bolt. each adapted to receive a cutting element. said stepped surfaces having transverse stop edges for locating said cutter element thereon and a separable top member having a depending edge adapted to contact the surface of the cutting element and means for securing said top member to said bottom portion to clamp the cutting element therebetween.
  • clamping plate and said block are provided respectively with a bore for receiving said bolts.
  • said clamping plate and said block having slots extending from the bores to the edge thereof and means for clamping said slots to form a resilient clamp securing said bolt therein.
  • said top member comprises a claw plate adapted to be placed over said cutting element.
  • said claw plate having an oblong slot therein.
  • said means for securing said top member includes a threaded screw adapted to pass through said slot.
  • said bottom portion having a threaded hole for receiving said screw to thereby permit said claw plate to be selectively positioned thereon.
  • top claw plate is provided with a second edge opposite to the depending edge and along its rear end extending 8 upwardly from the plane thereof to form a working edge for positioning said top plate with respect to said chuck.
  • an adjustable screw pin depending from the top claw plate toward the bottom portion of said chuck adjacent said rear edge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US375718A 1972-07-27 1973-07-02 Fixture for holding blades during grinding Expired - Lifetime US3881888A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1123772 1972-07-27

Publications (1)

Publication Number Publication Date
US3881888A true US3881888A (en) 1975-05-06

Family

ID=4371474

Family Applications (1)

Application Number Title Priority Date Filing Date
US375718A Expired - Lifetime US3881888A (en) 1972-07-27 1973-07-02 Fixture for holding blades during grinding

Country Status (4)

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US (1) US3881888A (US08080257-20111220-C00005.png)
JP (1) JPS4958494A (US08080257-20111220-C00005.png)
CH (1) CH546123A (US08080257-20111220-C00005.png)
DE (1) DE2303557C3 (US08080257-20111220-C00005.png)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4941631A (en) * 1988-07-10 1990-07-17 Misch Donald W Semi-micro manipulator
US5116008A (en) * 1991-04-03 1992-05-26 Edgewater Medical Equipment Systems, Inc. Adjustable support assembly
WO1995029789A1 (en) * 1994-04-29 1995-11-09 Terrence James Parke Sharpening apparatus
US5545081A (en) * 1994-08-09 1996-08-13 Delta International Machinery Corp. Tool fixture for abrading apparatus
US5561912A (en) * 1992-05-28 1996-10-08 Buehler Ltd. Three axis goniometer
US5921847A (en) * 1997-09-24 1999-07-13 Laflamme; Robert P. Grinding fixture and method of remanufacturing tool inserts
US5938511A (en) * 1997-11-21 1999-08-17 Patterson; James D. Grinding guide assembly
US6032938A (en) * 1998-08-28 2000-03-07 Lee Valley Tools Ltd. Carver's vise
US6475074B2 (en) * 2000-11-15 2002-11-05 Dean Blanton Sharpener attachment for rotary tool
US20030186637A1 (en) * 2002-03-27 2003-10-02 Roger Kaye Material positioning and shaping system, apparatus, and method thereof
WO2004072492A2 (en) * 2003-02-12 2004-08-26 Tor.Mec Ambrosi Snc Di Ambrosi Flavio & C. Device for fastening objects intended to be measured or worked with accuracy
US6926596B1 (en) * 2004-02-05 2005-08-09 Pacific Rack & Machine Tool sharpening apparatus
US20050239384A1 (en) * 2004-04-26 2005-10-27 True Setting Sales Reshaping fixture for carbide inserts
US20090318066A1 (en) * 2008-06-23 2009-12-24 Tymen Clay Grinding and honing fixture with clamping jaws
US20140091510A1 (en) * 2012-10-01 2014-04-03 Lloyd, Gerstner & Partners Fastening hardware holder with installation indicator
US20140342644A1 (en) * 2013-05-17 2014-11-20 Tom Hiroshi Hasegawa Blade Sharpening Stand
US20160236319A1 (en) * 2015-02-18 2016-08-18 Tormek Ab Adjustable grinding jig
CN106002622A (zh) * 2016-07-14 2016-10-12 东莞市才立金属科技有限公司 一种环形工件加工夹头
KR101875390B1 (ko) * 2017-01-23 2018-07-06 박선근 톰슨나이프 각도 연마장치
CN108436651A (zh) * 2018-03-22 2018-08-24 湖北金禄科技有限公司 一种pcb钻孔后除披锋装置
KR20190027612A (ko) * 2017-09-07 2019-03-15 장성진 연마기용 칼날 지지대
US11756814B1 (en) * 2021-05-27 2023-09-12 Meta Platforms, Inc. Vertical polishing system with multiple degrees of freedom

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3723995A1 (de) * 1987-07-21 1989-02-02 Dick Friedr Gmbh Einrichtung zum schleifen
JP2004298992A (ja) * 2003-03-31 2004-10-28 Seiko Instruments Inc 治具盤および端面研磨装置
CN102328223B (zh) * 2011-07-29 2013-04-10 吴江市和喜机械有限公司 一种用于钻床上的零件固定夹具
CN103786045B (zh) * 2014-02-27 2016-04-27 湖南凯斯机械股份有限公司 适用于加工缝纫机机头的夹具及加工方法
CN112676878B (zh) * 2020-12-14 2022-05-06 湖南凯斯机械股份有限公司 一种缝纫机机头及平板的智能化加工系统及加工工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1320462A (en) * 1919-11-04 Ments
US1323127A (en) * 1919-11-25 Work-clamp
US1670253A (en) * 1926-04-19 1928-05-15 Gilbert Arthur Welding clamp
US1915247A (en) * 1930-09-17 1933-06-20 Stanley Works Work holding device for grinding machines
US3066930A (en) * 1959-04-20 1962-12-04 Walter I Chinnick Holding tongs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1320462A (en) * 1919-11-04 Ments
US1323127A (en) * 1919-11-25 Work-clamp
US1670253A (en) * 1926-04-19 1928-05-15 Gilbert Arthur Welding clamp
US1915247A (en) * 1930-09-17 1933-06-20 Stanley Works Work holding device for grinding machines
US3066930A (en) * 1959-04-20 1962-12-04 Walter I Chinnick Holding tongs

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4941631A (en) * 1988-07-10 1990-07-17 Misch Donald W Semi-micro manipulator
US5116008A (en) * 1991-04-03 1992-05-26 Edgewater Medical Equipment Systems, Inc. Adjustable support assembly
US5561912A (en) * 1992-05-28 1996-10-08 Buehler Ltd. Three axis goniometer
WO1995029789A1 (en) * 1994-04-29 1995-11-09 Terrence James Parke Sharpening apparatus
US5775180A (en) * 1994-04-29 1998-07-07 Parke; Terrence J. Sharpening device
US5545081A (en) * 1994-08-09 1996-08-13 Delta International Machinery Corp. Tool fixture for abrading apparatus
US5921847A (en) * 1997-09-24 1999-07-13 Laflamme; Robert P. Grinding fixture and method of remanufacturing tool inserts
US5938511A (en) * 1997-11-21 1999-08-17 Patterson; James D. Grinding guide assembly
US6032938A (en) * 1998-08-28 2000-03-07 Lee Valley Tools Ltd. Carver's vise
US6475074B2 (en) * 2000-11-15 2002-11-05 Dean Blanton Sharpener attachment for rotary tool
US20030186637A1 (en) * 2002-03-27 2003-10-02 Roger Kaye Material positioning and shaping system, apparatus, and method thereof
US6821193B2 (en) 2002-03-27 2004-11-23 Roger Kaye Material positioning and shaping system apparatus
WO2004072492A2 (en) * 2003-02-12 2004-08-26 Tor.Mec Ambrosi Snc Di Ambrosi Flavio & C. Device for fastening objects intended to be measured or worked with accuracy
WO2004072492A3 (en) * 2003-02-12 2005-04-21 Tor Mec Ambrosi Snc Di Ambrosi Device for fastening objects intended to be measured or worked with accuracy
US6926596B1 (en) * 2004-02-05 2005-08-09 Pacific Rack & Machine Tool sharpening apparatus
US20050176355A1 (en) * 2004-02-05 2005-08-11 Tarris Wayne A. Tool sharpening apparatus
US20050239384A1 (en) * 2004-04-26 2005-10-27 True Setting Sales Reshaping fixture for carbide inserts
US20090318066A1 (en) * 2008-06-23 2009-12-24 Tymen Clay Grinding and honing fixture with clamping jaws
US8348725B2 (en) 2008-06-23 2013-01-08 Tymen Clay Grinding and honing fixture with clamping jaws
US20140091510A1 (en) * 2012-10-01 2014-04-03 Lloyd, Gerstner & Partners Fastening hardware holder with installation indicator
US20140342644A1 (en) * 2013-05-17 2014-11-20 Tom Hiroshi Hasegawa Blade Sharpening Stand
US20160236319A1 (en) * 2015-02-18 2016-08-18 Tormek Ab Adjustable grinding jig
US9789583B2 (en) * 2015-02-18 2017-10-17 Tormek Ab Adjustable grinding jig
CN106002622A (zh) * 2016-07-14 2016-10-12 东莞市才立金属科技有限公司 一种环形工件加工夹头
CN106002622B (zh) * 2016-07-14 2018-06-01 东莞市才立金属科技有限公司 一种环形工件加工夹头
KR101875390B1 (ko) * 2017-01-23 2018-07-06 박선근 톰슨나이프 각도 연마장치
KR20190027612A (ko) * 2017-09-07 2019-03-15 장성진 연마기용 칼날 지지대
CN108436651A (zh) * 2018-03-22 2018-08-24 湖北金禄科技有限公司 一种pcb钻孔后除披锋装置
US11756814B1 (en) * 2021-05-27 2023-09-12 Meta Platforms, Inc. Vertical polishing system with multiple degrees of freedom

Also Published As

Publication number Publication date
DE2303557A1 (de) 1974-02-07
DE2303557B2 (de) 1980-06-19
JPS4958494A (US08080257-20111220-C00005.png) 1974-06-06
CH546123A (de) 1974-02-28
DE2303557C3 (de) 1981-02-26

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