US3777442A - Wide belt sanding machine with improved support for outboard end of cantilevered center bar - Google Patents

Wide belt sanding machine with improved support for outboard end of cantilevered center bar Download PDF

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Publication number
US3777442A
US3777442A US00240683A US3777442DA US3777442A US 3777442 A US3777442 A US 3777442A US 00240683 A US00240683 A US 00240683A US 3777442D A US3777442D A US 3777442DA US 3777442 A US3777442 A US 3777442A
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United States
Prior art keywords
pad
center bar
belt
outboard end
machine
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Expired - Lifetime
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US00240683A
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English (en)
Inventor
J Bernu
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Timesavers Inc
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Timesavers Inc
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Publication date
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    • 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
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work

Definitions

  • a sanding machine has a wide endless abrasive belt trained around a contact drum and a tensioning roll, both journaled in bearings mounted on a cantilevered center bar.
  • the outboard end of the center bar is rigidly supported by a spacer block removably inserted between the underside ofa foot-like bracket depending from the outboard end of the center bar and the top surface of a pad vertically adjustably mounted on the frame of the machine beneath the bracket.
  • a clamping screw that passes freely through aligned holes in the bracket and the removable spacer block, and is threaded into the vertically adjustable pad, secures the outboard end of the center bar to the frame.
  • the work performing portion of the machine known as the sanding head comprises the center bar, a contact drum and a tension roll that are rotatably mounted on the center bar, and the endless abrasive belt that is trained around the tension roll and contact drum.
  • workpieces fed through the machine on a horizontal conveyor belt beneath the contact drum are abraded by the sanding head as they are carried under it.
  • the center bar Since the center bar takes all work reaction forces, it must be solidly supported at both ends. Accordingly, the outboard end of the center bar has to be supportingly connected with the adjacent main frame portion therebeneath. But to enable the endless abrasive belt to be removed and replaced when necessary, the supporting connection between the outboard end of the center bar and the main frame must be separable.
  • FIG. 1 is a view of a belt sanding machine embodying the principles of this invention, mainly in end elevation but with portions shown in section to illustrate details of the separable connection between the main frame structure and the outboard end of the center bar, and with the upper housing structure merely indicated with light broken lines;
  • FIG. 2 is a fragmentary view, mainly in elevation but partly in section, showing the separable connection as seen from the left of FIG. 1;
  • FIG. 3 is an exploded perspective view of the components of the separable connection.
  • the numeral 4 designates generally the sanding head of the illustrated wide belt sanding machine, comprising an endless abrasive belt 5 trained around an upper tensioning roll 6 and a lower contact drum 7.
  • the abrasive belt of the sanding head is pressed against the top surface of workpieces carried through the machine on the upper stretch of a conveyor belt 8 which rides on a platen, not shown.
  • a motor 9 drivingly connected with the contact drum drives the abrasive belt at high speed; and another motor (not shown) drives the conveyor at an appropriate speed.
  • the entire conveyor structure is mounted on the lower base portion 10 of the main frame of the machine, for vertical adjustment to accommodate workpieces of different thicknesses.
  • the main frame of the machine is a weldment and at the opposite sides of its base portion 10 it has upright side frame sections 11 and 12, the former being taller than the latter. Rigidly fixed to the top of the taller side frame section 11, and extending cantilever fashion therefrom towards the other side of the machine, is a horizontal arm 13 which, in the parlance of the art, is known as the center bar of the machine. It is this part of the machine that carries the sanding head 4.
  • bearings 14 that are mounted in brackets 15l5' fixed to and depending from'the underside of the center bar, have the shaft of the contact drum journaled therein; and a yoke 16, with bearings 17 in which the tension roll is journaled, is supported on the center bar by the ram of an air cylinder 18 that is fixed to the center bar. Since the center bar is a hollow member substantially square in cross section with horizontal top and bottom walls, the air cylinder is set into the center bar and secured to its top wall.
  • the tension roll can be raised, as needed, to tension the abrasive belt and can be lowered to permit its removal and replacement.
  • the contact drum-supported abrasive belt engages the workpiece being acted upon with considerable force, and since exact parallelism is necessary between the contact drum and the platen-supported upper stretch of the conveyor belt, it is evident that the sanding head must be solidly supported against any possible deflection. Accordingly, the outboard end of the cantilevered center bar, as well as its anchored end, must be rigidly supported and tied to the frame of the machine. But the structure supporting the outboard end of the center bar must be such that it can be gotten out of the way to permit the endless abrasive belt to be removed and replaced. It is primarily in the manner in which the outboard end'of the center bar is connected to the machine frame that the present invention distinguishes from the prior art. As in the past, the connection is separable but compared with previous structures for this purpose, it is a significant and substantial improvement.
  • the separable connection is made between the top of the shorter side frame section 12 and the bottom of the adjacent bearing bracket 15.
  • this bracket which is also a weldrnent is substantially a foot with a horizontal bottom wall 21 the underside of which is flat and overlies the upwardly facing surface of the horizontal top wall 22 of the side frame section 12.
  • the space or gap between said opposing downwardly and upwardly facing surfaces is in line with the underside of the contact drum 7.
  • the separable connection comprises a removable spacer block 24, a vertically adjustable pad 25 and a clamping screw 26.
  • the vertically adjustable pad 25 has a stepped configuration with a generally square upper portion 27 and a larger laterally projecting flange-like lower portion 28.
  • the pad is secured to the horizontal top wall 22 of the side frame section 12 with its upper portion 27 protruding upwardly through a hole 29 in the wall 22, to have its flat top surface above the level of the top wall 22. It is secured in place by counteracting screws 30 and 31.
  • the screws 30 pass downwardly through holes in the top wall 22 and are threaded into tapped holes 32 in the lower portion 28 of the pad, and the screws 31 are threaded into tapped holes in the lower portion of the pad and bear against the underside of the wall 22.
  • the top surface of the pad can be accurately brought to any elevation needed to assure that upon insertion of the removable spacer block 24 between the top of the pad and the underside of the bottom wall 21 of the boat-like bracket 15 the outboard end of the cantilevered center bar will be so located that the sanding head mounted thereon will be properly positioned with respect to the platen-supported hori zontal top stretch of the conveyor belt.
  • the clamping screw 26 ties the outboard end? of the center bar to the side frame section 12 and to do so it passes freely through a hole 39 in the bottom wall 21 of the bracket 15 and a hole 40 in the spacer block 24, and is threaded into a hole 41 in the pad.
  • Wings 42 that project from the head of the clamping screw make it easy to tighten and/or loosen the screw; and a bail-like handle 43 that projects from the front of the spacer block facilitates its insertion and withdrawal.
  • the upper portion 27 of the pad and the spacer block have the same size and shape in horizontal plan, so that when in operative position, the spacer block is substantially a continuation of the pad.
  • the vertical adjustability of the pad 25 completely obviates time consuming tailormaking and fitting the spacer block to a particular machine frame, and instead permits the same sized spacer block to be used with any and all machine frames, despite the dimensional variations that are inevitable in weldments; and that it also enables restoration of alignment between the sanding head and the platen-supported conveyor if, for any reason, such as working stresses in the machine, realignment becomes necessary.
  • a belt-type sanding machine having a main frame with upright side frame sections, a horizontal work support between said side frame sections and a sanding head above the work support carried by a horizontal center bar having an inboard end securely fixed to one of said side frame sections and an outboard end overlying and spaced above the other side frame section,
  • said sanding head having an orbitally driven endless abrasive belt which, during operation of the machine, has its downwardly facing bottom portion pressed against a workpiece on the work support along an elongated contact zone that extends transversely across the machine, and which abrasive belt must be periodically removed and replaced, and in the act thereof passes through the space between the outboard end of the center bar and the top of the adjacent side frame section,
  • said machine being characterized by improved means for separably connecting the outboard end of said center bar with the side frame section therebeneath, said means comprising:
  • a pad vertically adjustably connected with one of said two substantially horizontal walls and having a surface that in all positions of adjustment of the pad is at an elevation between said opposing surfaces and faces the other of said walls and is also substantially bisected by said vertical plane;
  • E. means for adjusting the elevation of said pad with respect to the wall with which it is connected and for securing said pad in an adjusted position at which its said surface is so spaced from the surface of the wall it faces that insertion and clamping of the spacer block between said facing surfaces accurately locates the sanding head with respect to the work support; and F. clamping means operable to draw said two substantially horizontal walls towards one another and thereby clamp said surfaces between which the spacer block is inserted tightly against the block.
  • said structure at the underside of the outboard end of the center bar comprises a bracket fixed to the center bar and depending therefrom a distance such that the downwardly facing surface provided thereby and which constitutes the bottom of said bracket is at a level close to that of the downwardly facing bottom portion of the endless abrasive belt.
  • the structure of claim 3 further characterized by a pressure applying member extending across the bottom portion of the endless abrasive belt to press the same against a workpiece on the work support.
  • said pressure applying member is a contact roll journaled in coaxial bearings fixed with respect to and located below the center bar with the axis of said bearings coinciding with said vertical plane
  • said pad has a stepped configuration with an upper portion rising from a flange-like lower portion; wherein said horizontal wall with which the pad is connected has a hole of a size and shape to accommodate the upper portion of the pad but not its flange-like lower portion;
  • said means for adjusting the elevation of the pad and securing it in adjusted position comprises a plurality of screws passing downwardly through holes in said horizontal wall and threaded into holes in the flange-like bottom portion of the pad and by which the pad may be drawn upwardly with respect to said horizontal wall, and other screws having threaded connection with the flange-like lower portion of said horizontal wall and bearing against the underside of said wall to draw the pad downward.
  • the spacer block is substantially an upward continuation of the upper portion of the pad
  • handle means on the spacer block to facilitate its placement into and withdrawal from operative position.
  • said clamping means comprises a clamping screw which passes freely through aligned holes in the substantially horizontal wall provided by the structure at the underside of the outboard end of the center bar and in the spacer block, and has a head bearing on said substantially horizontal wall and a threaded connection with said pad.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US00240683A 1972-04-03 1972-04-03 Wide belt sanding machine with improved support for outboard end of cantilevered center bar Expired - Lifetime US3777442A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24068372A 1972-04-03 1972-04-03

Publications (1)

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US3777442A true US3777442A (en) 1973-12-11

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US (1) US3777442A (cg-RX-API-DMAC10.html)
JP (1) JPS5143920B2 (cg-RX-API-DMAC10.html)
AU (1) AU451951B2 (cg-RX-API-DMAC10.html)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893265A (en) * 1974-10-02 1975-07-08 Timesavers Inc Vertical abrasive belt type surface grinder
US4313285A (en) * 1979-04-25 1982-02-02 Bertil Jonasson Stabilizing device
US4669224A (en) * 1986-07-02 1987-06-02 Westinghouse Electric Corp. Vertical to horizontal adapter for a belt grinding machine
US5184424A (en) * 1991-10-22 1993-02-09 Miller Todd L Self correcting belt tracking apparatus for widebelt abrasive grinding machine
US5185963A (en) * 1992-04-08 1993-02-16 Timesavers, Inc. Pivotal arm belt loading device
USD341843S (en) 1991-03-25 1993-11-30 Woodmaster Tools, Inc. Sanding machine
US5335453A (en) * 1991-06-06 1994-08-09 Commissariat A L'energie Atomique Polishing machine having a taut microabrasive strip and an improved wafer support head
CN100560291C (zh) * 2006-01-27 2009-11-18 张文奇 砂带轨迹调整结构
US20140030961A1 (en) * 2012-07-30 2014-01-30 Rohm And Haas Electronic Materials Cmp Holdings, Inc. Method for chemical mechanical polishing layer pretexturing
US11268648B2 (en) * 2016-09-14 2022-03-08 Mitsubishi Heavy Industries Compressor Corporation Supporting platform, rotating machine unit, and method for manufacturing rotating machine unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2027101A (en) * 1930-10-24 1936-01-07 Oronoque Oil Burner Corp Oil burner
US2597256A (en) * 1950-03-01 1952-05-20 Ernest E Murray Polishing belt control means
US3021100A (en) * 1960-09-02 1962-02-13 Robert J Verhota Support
US3354588A (en) * 1964-11-25 1967-11-28 Solem Machine Company Wide belt abrasive machine
US3504458A (en) * 1967-07-19 1970-04-07 Carborundum Co Grinding machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2027101A (en) * 1930-10-24 1936-01-07 Oronoque Oil Burner Corp Oil burner
US2597256A (en) * 1950-03-01 1952-05-20 Ernest E Murray Polishing belt control means
US3021100A (en) * 1960-09-02 1962-02-13 Robert J Verhota Support
US3354588A (en) * 1964-11-25 1967-11-28 Solem Machine Company Wide belt abrasive machine
US3504458A (en) * 1967-07-19 1970-04-07 Carborundum Co Grinding machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893265A (en) * 1974-10-02 1975-07-08 Timesavers Inc Vertical abrasive belt type surface grinder
US4313285A (en) * 1979-04-25 1982-02-02 Bertil Jonasson Stabilizing device
US4669224A (en) * 1986-07-02 1987-06-02 Westinghouse Electric Corp. Vertical to horizontal adapter for a belt grinding machine
USD341843S (en) 1991-03-25 1993-11-30 Woodmaster Tools, Inc. Sanding machine
US5335453A (en) * 1991-06-06 1994-08-09 Commissariat A L'energie Atomique Polishing machine having a taut microabrasive strip and an improved wafer support head
US5184424A (en) * 1991-10-22 1993-02-09 Miller Todd L Self correcting belt tracking apparatus for widebelt abrasive grinding machine
US5185963A (en) * 1992-04-08 1993-02-16 Timesavers, Inc. Pivotal arm belt loading device
CN100560291C (zh) * 2006-01-27 2009-11-18 张文奇 砂带轨迹调整结构
US20140030961A1 (en) * 2012-07-30 2014-01-30 Rohm And Haas Electronic Materials Cmp Holdings, Inc. Method for chemical mechanical polishing layer pretexturing
US9108293B2 (en) * 2012-07-30 2015-08-18 Rohm And Haas Electronic Materials Cmp Holdings, Inc. Method for chemical mechanical polishing layer pretexturing
US11268648B2 (en) * 2016-09-14 2022-03-08 Mitsubishi Heavy Industries Compressor Corporation Supporting platform, rotating machine unit, and method for manufacturing rotating machine unit

Also Published As

Publication number Publication date
JPS5143920B2 (cg-RX-API-DMAC10.html) 1976-11-25
AU451951B2 (en) 1974-08-22
JPS4925596A (cg-RX-API-DMAC10.html) 1974-03-07
AU4844772A (en) 1974-05-23

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