EP0642896A1 - Schwenklager für eine Kappsäge - Google Patents

Schwenklager für eine Kappsäge Download PDF

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Publication number
EP0642896A1
EP0642896A1 EP94305871A EP94305871A EP0642896A1 EP 0642896 A1 EP0642896 A1 EP 0642896A1 EP 94305871 A EP94305871 A EP 94305871A EP 94305871 A EP94305871 A EP 94305871A EP 0642896 A1 EP0642896 A1 EP 0642896A1
Authority
EP
European Patent Office
Prior art keywords
pivot
saw
pivot member
block
axis
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.)
Granted
Application number
EP94305871A
Other languages
English (en)
French (fr)
Other versions
EP0642896B1 (de
Inventor
Andrea Garuglieri
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0642896A1 publication Critical patent/EP0642896A1/de
Application granted granted Critical
Publication of EP0642896B1 publication Critical patent/EP0642896B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/16—Saw benches
    • B27B5/18—Saw benches with feedable circular saw blade, e.g. arranged on a carriage
    • B27B5/20—Saw benches with feedable circular saw blade, e.g. arranged on a carriage the saw blade being adjustable according to depth or angle of cut; Radial saws, i.e. sawing machines with a pivoted radial arm for guiding the movable carriage
    • B27B5/206—Saw benches with feedable circular saw blade, e.g. arranged on a carriage the saw blade being adjustable according to depth or angle of cut; Radial saws, i.e. sawing machines with a pivoted radial arm for guiding the movable carriage the saw blade being carried by a pivoted lever

Definitions

  • This invention relates to chop saws of the type comprising a table, a pivot block on the table, a pivot member pivotally mounted with respect to the table about a first axis (which is the bevel axis of the saw) lying in the plane of the table, and a saw assembly mounted on the pivot member and including a motor driven blade adapted to move in its plane (which plane contains said axis) to cut workpieces supported on the table.
  • the invention is especially useful, although no limited to, saws of the type which have the table mounted in a frame so that the table can flip over between two positions.
  • the saw In a first position the saw is a chop saw with the saw assembly being above the table, but in the second position, the saw assembly is below the table and the blade is adapted to protrude from below through a slot in the table so that workpieces supported on the under surface of the table (now on top) may be presented to the blade for rip sawing and the like.
  • the present invention is concerned with the bevel pivot arrangements of such saws.
  • the pivot member is pivotable with respect to the table so that the blade can impinge the workpiece at any desired angle, usually between 45° and 90°, in order to make bevel cuts in the workpiece.
  • the table may also be in two parts.
  • a rotatable part is received in a fixed part and is rotatable with respect to the fixed part about an axis perpendicular to both the bevel pivot axis and the plane of the table.
  • the mitre cut option is usually only employed when the saw operates as a chop saw, it being usual to adjust the position of the workpiece, rather than the blade, when mitre cuts are to be made when the saw is in a bench saw mode.
  • the block may be a part of the table or a separate element connected to it.
  • the pivot member and pivot block abut one another and must slide against each other.
  • Some form of releasable clamping means must be provided to lock the two together during cutting operations and to release them for pivoting. The connection between them must be as accurate as possible in order to ensure that the bevel axis remains constant (that is to say, it must not be allowed to float) and so that repeatable cuts can be made.
  • US-A-4934233 discloses a chop saw in which the bevel pivot arrangement comprises two mutually engaging closed cylinders rotatable about a connecting pin whose axis is the bevel axis. Such a arrangement is very secure, but if each cylinder is a cast aluminum part then machining of the parts is inevitably required where they bear against each other, not only to ensure accuracy but also to provide smooth movement of one against the other.
  • a say comprising a table, a pivot block fixed to a first surface of the table, a pivot member pivotally mounted with respect to the pivot block about a first axis, a saw assembly mounted on the pivot member and comprising a motor driven blade lying in a plane containing said first axis, the blade being adapted to move with respect to said pivot member in said plane to cut workpieces supported on said first surface of the table, characterised in that a bearing plate is disposed between said pivot block and pivot member and against which one of said pivot block and pivot member bear during pivoting of the pivot member with respect to the pivot block.
  • Such an arrangement permits a particularly smooth pivoting movement between the pivot block and pivot member reducing the friction between them. This is particularly important when the two components are constructed from cast aluminum and reduces the need for machining of these parts.
  • pivot block and pivot member are cast aluminum and the bearing plate is steel.
  • the plate can be adapted to other functions which would not easily be, or at least would result in much greater wear problems, if performed by the pivot block and pivot member themselves.
  • the bearing plate preferably further comprises an arcuate rack whose centre is said first axis and a pinion engages said rack and rotates through said engagement on pivoting of the pivot member with respect to the pivot block, a dial being operatively connected to said pinion to indicate the angle of pivot of said pivot member to said pivot block.
  • said plate is fixed to the pivot block and said pinion is journalled in said pivot member.
  • Clamping means may be provided to clamp said pivot block and pivot member together in a desired position.
  • Said clamping means may comprise a pin received in one of said pivot block and pivot member passing through an arcuate slot in the other of said pivot member and pivot block.
  • the pin is received in the pivot member and serves as the journal for said pinion, said arcuate slot being formed in the pivot block.
  • index notches are formed on the periphery of said plate and a pawl member is disposed on one of the pivot member and pivot block to engage said notches in different selected pivot positions of the pivot member with respect to the pivot block so as to locate said pivot member and pivot block in one of said positions.
  • said pivot member has a projection received in a groove in said table, the projection and groove having part substantially cylindrical engaging pivot surfaces whose axes coincide with said first axis.
  • said projection has a second opposing part substantially cylindrical pivot surface, centred on said first axis, which bears against a corresponding surface of said plate, when said plate is fixed to the pivot block.
  • the use of the plate as the opposing pivot surface, maintaining the projection in the groove in the table, so that the accuracy of the position of said first axis can be assured provides several advantages. Firstly, it provides an accurate surface, being capable of being formed by pressing of the sheet steel, from which the plate is fabricated, without any requirement for machining. Its position in the pivot block can be adjusted to accommodate tolerances in the cast aluminium parts, so that a snug sliding fit over the projection can be achieved. Secondly, it provides a smooth bearing surface for the pivot.
  • saw 10 comprises a table 16 mounted in a frame 12.
  • the table is adapted to pivot in the frame through 180° from the position shown in Figure 1 (chop saw or mitre saw mode) to an inverted position which is not illustrated and is the bench or table saw mode.
  • a pivot block 27 On a first surface 16a of the table 16 is fixed a pivot block 27. To the pivot block 27 is pivotally mounted a pivot member 26 adapted to pivot about a first axis 92 which is coincident with the plane of the table 16.
  • a saw assembly 20 is pivotally mounted on the pivot member about a second axis 28 which is perpendicular to the first axis 92.
  • the saw assembly 20 includes a motor driven blade 36 which lies in a plane perpendicular the second axis 28 and containing the axis 92.
  • the saw assembly 20 is pivotable about the axis 28 to plunge the blade into a workpiece (not shown) supported on the surface of the table 16 against a fence 17.
  • a slot (not shown) is provided in the table 16 to receive the plunging blade and also so that the blade protrudes through the table and beyond its under surface 16b. When the table is inverted the protruding blade can be employed to cut workpieces supported on the under surface 16b (now on top) and presented to the blade.
  • the pivot block 27 is a cast aluminium component bolted to the table 16 by screws and captive nuts 18.
  • the pivot member 26 is likewise a cast aluminium component. It comprises a bracket 19 including axis 28 for connection of the saw assembly 20 and a projection 88 which is received in a groove 90 in the table 16.
  • the projection and groove have first mutually engaging part substantially cylindrical pivot surfaces centred on the axis 92.
  • a connecting bolt 44 is received in a pinion 52 rotationally received in a bore 51 of the pivot member 26.
  • the bolt 44 passes through an arcuate slot 173 in the pivot block 27, which slot is centred on axis 92.
  • the pivot block 27 has a part cylindrical surface 82 which mounts a pivot guide 76.
  • the pivot guide is an arcuate component having a corresponding mating cylindrical surface 80.
  • a bore in the pivot guide receives the bolt 44 and a recess 74 captivates a lock nut 60 received on the threaded end of the bolt 44.
  • a clamping arrangement 67 (such as described in our copending British application No. 9218366.4) is employed to tighten the connection, clamping the pivot block 27 and pivot member 26 between the pivot guide 76 and pinion 52.
  • the pivot guide serves two purposes; one, to close the slot 173 against the ingress of dust in any pivot position of the pivot member, and, two, to carry a fence guide (not shown), but further described in our copending application filed simultaneously herewith under the title "A Power Saw Fence Guide”.
  • a bearing plate 46 (see also Figures 5a, b and c) which is affixed to the pivot block by two countersunk screws 47 (see Figures 4a and b), the screws being received in counter sunk bores 43 in the plate 46 and in nuts 49 captivated in slots 53 in the pivot block.
  • Bores 55 in the pivot block, through which the screws 47 pass, are slightly elongated to allow some angular, and even a small amount of radial, adjustment (for reasons explained further below) of the plate 46 in the pivot block and with respect to the axis 92.
  • the bearing plate 46 serves several functions. Primarily it is a bearing plate separating the pivot block and pivot member so that wear is reduced and pivoting is rendered smoother. Also, the amount of machining required of the pivot block and pivot member is reduced because the plate 46 is formed from pressed steel sheet which obviously does not require further machining. Any tolerance inaccuracies in the pivot block 27 can be taken up by adjustment of the position of the plate 46.
  • the plate 46 serves three further purposes, however. Pressed out of its plane is a rack sector 48 having teeth 50 located in an arc centred on the axis 92. The teeth 50 are engaged by teeth 54 on the pinion 52, so that, when the pivot member pivots about axis 92 with respect to the pivot block, the pinion 52 is obliged to rotate in the bore 51 of the pivot member and about the bolt 44.
  • a scale 58 is fixed to the rear of the pivot member 26.
  • the pinion has a pointer 56.
  • the scale is positioned so that the pointer is at zero on the scale.
  • Screws 57 secure the scale to the pivot member through elongate holes 59 in the scale, so permitting some rotational adjustment of the position of the scale. Then, when pivoting of the pivot member occurs, the pointer indicates the angle (the scale of course being dimensioned appropriately) through which the pivot member (and the saw assembly) has been pivoted.
  • the scale 58 enables the bevel angle of the saw assembly 20 to be seen, but of course only from the rear of the saw 10 when in its chop saw mode as shown in Figure 1. However, when the saw table 16 is inverted to render the saw a table saw, the scale 58 is both at, and facing, the front of the saw (to the left of Figure 1) where it can easily be seen by an operator.
  • a second scale 78 is formed on the front of the pivot block 27 which is exposed by a notch 75 in the pivot guide 76, which notch also indicates the bevel angle of the pivot member.
  • the second further purpose of the bearing plate 46 is ancillary to its first, in that it is provided with a series of notches 61 in an arc centred on the pivot axis 92. These notches coincide with coarser notches 63 in the pivot block 27.
  • the pivot member has a toggle lever or pawl member 62 positioned thereon and which has a tooth 64 adapted to engage one of the notches 61 and locate the pivot member at the angle determined by the relevant notch.
  • Notches 61 are provided at the commonly employed bevel angles of 0°, 15°, 22.5°, 30° and 45° etc.
  • the plate 46 On assembly of the saw 10, the plate 46 is only loosely fastened to the pivot block. Once the saw assembly has been connected and the saw blade is vertical, the angular position of the plate 46 is adjusted as mentioned above so that the tooth 64 squarely engages the 0° notch 61 of the plate. The screws 47 can then be tightened.
  • a similar toggle lever 62' is employed to locate the pivot block at a desired mitre angle when the table has round rotatable portion (on which the pivot block is fixed) set in a fixed portion so that the saw assembly 20 can swivel about a vertical axis in Figure 1 for making mitre cuts.
  • the fence 17 is in this event fixed to the fixed portion of the table].
  • the third further purpose of the bearing plate is to provide a part cylindrical surface 130, again pressed out of the steel plate, to support and locate the projection 88 in the groove 90.
  • the projection has a corresponding part cylindrical surface 132 which bears against surface 130.
  • These surfaces 130, 132 oppose the corresponding part cyclindrical surfaces of the projection 88 and groove 90 and likewise have axes coincident with the axis 92.
  • the weight of the saw assembly tends to keep the projection in the groove 90. Even if the clamping mechanism 67 is overly loosened (for example by using a spanner on bolt head 69 of the link pin 44) the geometry of the arrangement is such that the components are not overly stressed because the pivot member 26 is naturally pressed against the pivot block by the weight of the saw assembly.
  • the plate 46 be provided with a preload against the projection 88 so that there is no clearance between them which may lead to error, particularly in the bench saw mode, in the angular position of the pivot member,relative to the pivot block. Moreover, it is apparent that the angular position of the pivot member, and hence the blade 36, with respect to the table 16 is dependent on the precision with which the angular position of plate 46 is fixed relative to the pivot block 27.
  • two set screws 100 are provided in the table 16 which each are threaded in lock nuts 102. The screws are captivated by pressings 104,106 of the plate 46 one on each side of the screw 100.
  • Each lock nut is captivated and held against rotation by a window 108 in the plate 46.
  • the screws 100 are arranged on either side of the plate 46 with respect to the pivot axis 92. Simultaneous tightening of the screws 100 in the lock nuts 102 serves to draw the plate 46 vertically downwards relative to the table 16 so as to preload the projection 88. Overtightening of the screws 100 serves to clamp the projection 88, which is, of course, undesirable. Loosening of one screw 100 while tightening the other screw 100 serves to rotate the plate 46 about pivot axis 92 because the surface 130 slides over the cylindrical surface 132 of the projection 88. Such adjustment enables the position of the notch 61 which locates the pivot member 26 in the 0° position to be accurately set. Of course, before either preload or angular adjustments of the plate 46 are effected, the screws 47 are first loosened.
  • the plate 46 can be accurately set at the O° position by the means described above, and because the pivot axis 92 of the pivot member 26 is in part provided by surface 130 of the plate 46, and because the plate 46 is to an extent positioned by said axis 92 and the mating cylindrical surfaces 132 and 130, no other form of stop limiting the pivot of the pivot member 26 is required. This assumes, of course, that the notches 61 are accurately positioned, with respect to the O° position relative to the pivot surface 130 and the pivot axis 92.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
EP19940305871 1993-08-12 1994-08-08 Schwenklager für eine Kappsäge Expired - Lifetime EP0642896B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9316724 1993-08-12
GB939316724A GB9316724D0 (en) 1993-08-12 1993-08-12 Pivot bearing for a chop saw

Publications (2)

Publication Number Publication Date
EP0642896A1 true EP0642896A1 (de) 1995-03-15
EP0642896B1 EP0642896B1 (de) 1997-10-15

Family

ID=10740355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940305871 Expired - Lifetime EP0642896B1 (de) 1993-08-12 1994-08-08 Schwenklager für eine Kappsäge

Country Status (5)

Country Link
EP (1) EP0642896B1 (de)
JP (1) JPH07148702A (de)
CA (1) CA2129883A1 (de)
DE (1) DE69406231T2 (de)
GB (1) GB9316724D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1623803A1 (de) * 2004-08-04 2006-02-08 Makita Corporation Mechanismus zum Einstellen schräger Positionen einer Schneideinrichtung
CN102059723A (zh) * 2009-08-20 2011-05-18 株式会社牧田 台式切割机的切割机机身的倾斜位置定位机构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7752951B2 (en) 2006-09-18 2010-07-13 Normand Ouellette Convertible circular saw apparatus usable as either a miter saw or a table saw
DE202008001745U1 (de) * 2008-02-07 2009-07-09 Metabowerke Gmbh Kappsäge mit Neigungsverstellung
JP5097588B2 (ja) * 2008-03-21 2012-12-12 株式会社マキタ 卓上切断機

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2010882A (en) * 1934-10-18 1935-08-13 Walker Turner Company Inc Self-indexing miter gauge
US3998121A (en) * 1976-02-03 1976-12-21 B & E Products, Inc. Miter cutting saw
DE2533296A1 (de) * 1975-07-25 1977-02-10 Licentia Gmbh Handkreissaege
DE3341244A1 (de) * 1983-11-15 1985-05-30 Georg Karstens GmbH Fabrik für Meßgeräte und Spezialmaschinen, 7302 Ostfildern Rundschleifmaschine
US4934233A (en) * 1988-06-29 1990-06-19 Emerson Electric Co. Compound miter saw

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2010882A (en) * 1934-10-18 1935-08-13 Walker Turner Company Inc Self-indexing miter gauge
DE2533296A1 (de) * 1975-07-25 1977-02-10 Licentia Gmbh Handkreissaege
US3998121A (en) * 1976-02-03 1976-12-21 B & E Products, Inc. Miter cutting saw
DE3341244A1 (de) * 1983-11-15 1985-05-30 Georg Karstens GmbH Fabrik für Meßgeräte und Spezialmaschinen, 7302 Ostfildern Rundschleifmaschine
US4934233A (en) * 1988-06-29 1990-06-19 Emerson Electric Co. Compound miter saw
US4934233B1 (en) * 1988-06-29 1994-08-23 Emerson Electric Co Compound miter saw

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1623803A1 (de) * 2004-08-04 2006-02-08 Makita Corporation Mechanismus zum Einstellen schräger Positionen einer Schneideinrichtung
CN100363159C (zh) * 2004-08-04 2008-01-23 株式会社牧田 锯断机的倾斜定位机构
US7549360B2 (en) 2004-08-04 2009-06-23 Makita Corporation Mechanisms for determining obliquely inclined positions of cutting devices
CN102059723A (zh) * 2009-08-20 2011-05-18 株式会社牧田 台式切割机的切割机机身的倾斜位置定位机构
CN102059723B (zh) * 2009-08-20 2015-01-28 株式会社牧田 台式切割机的切割机机身的倾斜位置定位机构

Also Published As

Publication number Publication date
DE69406231T2 (de) 1998-02-12
JPH07148702A (ja) 1995-06-13
DE69406231D1 (de) 1997-11-20
CA2129883A1 (en) 1995-02-13
EP0642896B1 (de) 1997-10-15
GB9316724D0 (en) 1993-09-29

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