US3832808A - Abrasive belt-type lumber planing machine - Google Patents

Abrasive belt-type lumber planing machine Download PDF

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Publication number
US3832808A
US3832808A US00377826A US37782673A US3832808A US 3832808 A US3832808 A US 3832808A US 00377826 A US00377826 A US 00377826A US 37782673 A US37782673 A US 37782673A US 3832808 A US3832808 A US 3832808A
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US
United States
Prior art keywords
pressure shoe
machine
workpiece
shoe
abrasive belt
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
US00377826A
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English (en)
Inventor
F Kiser
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.)
Timesavers Inc
Original Assignee
Timesavers 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 Timesavers Inc filed Critical Timesavers Inc
Priority to US00377826A priority Critical patent/US3832808A/en
Priority to CA185,219A priority patent/CA994104A/en
Priority to JP48138908A priority patent/JPS5136514B2/ja
Priority to FI3962/73A priority patent/FI396273A7/fi
Application granted granted Critical
Publication of US3832808A publication Critical patent/US3832808A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • These machines have a sanding or abrading head which comprises an endless abrasive belt trained over vertically spaced parallel rolls, the lower one being usually referred to as a contact drum since it supports the abrasive belt against the thrust of the workpiece as the workpiece moves through the machine.
  • a contact drum that is driven to impart high speed orbital motion to the abrasive belt.
  • the workpieces are carried horizontally through the machine with their top surface in contact with the drum-supported abrasive belt, by a conveyor unit vertically adjustably mounted in the machine below its sanding or abrading head.
  • the conveyor unit has an endless power driven conveyor belt, the top stretch of which slides across and is supported especially directly below the contact drum by a smooth surfaced horizontally disposed platen.
  • a downwardly biased infeed shoe holds the workpiece down on the conveyor belt as it enters the abrading zone and comes into contact with the drumsupported abrasive belt, and an outfeed shoe holds the workpiece down as it leaves the abrading zone.
  • this invention has as its object to so mount the infeed shoe that its toe at all times remains at substantially the same short distance from the zone of contact between the workpiece and the abrasive belt regardless of changes in the elevation of the toe of the shoe resulting from variations in the thickness of the workpieces.
  • FIG. 1 is a more or less diagramatic side view of an abrasive belt-type lumber planing machine embodying this invention
  • FIG. 2 is, a detail sectional view through the portion of the machine at which the abrasive planing action takes place;
  • FIG. 3 is a cross-sectional view through FIG. 6 on the planes of the line 3-3, illustrating the relationship between the infeed hold-down shoe and the contact drum-supported abrasive belt, and the mounting structure for the shoe;
  • FIG. 4 is a diagrammatic view illustrating in an exaggerated way, the retention of substantially constant positional relationship between the toe of the infeed shoe and the surface of the abrasive belt despite changes in elevation of the shoe;
  • FIG. 5 is a perspective view of one end portion of the shoe and the adjacent shoe mounting structure.
  • FIG. .6 is a top view of the structure shown in FIG. 5.
  • the numeral 7 indicates generally a lumber planing machine of the type to which this invention appertains.
  • Such machines have a conveyor bed 8 by which the workpieces are carried or fed horizontally through the machine with their top surface in engagement with the endless abrasive belt 9 of a sanding head 10.
  • the sanding head is fixedly mounted in the frame of the machine and comprises an abrasive belt 9 trained about a contact drum l2 and an idler roll 13, the former being power driven to impart highspeed orbital motion to the belt.
  • abrasive belt 9 is maintained under tension by an upward biasing force acting upon the idler roll 13 and that the manner in which the idler roll and the contact drum are mounted enables removal and replacement of the abrasive belt.
  • sanding head structure reference may be had to the copending Bernu application Ser. No. 240,683 now US. Pat. No. 3,777,442, which is assignedto the assignee of the present invention.
  • the conveyor bed comprises a rigid horizontally disposed frame designated generally by the numeral 15 with driven and idler rolls 16 and 17 respectively journaled in its opposite ends and a conveyor belt 8 trained over these rolls.
  • the top stretch of the conveyor belt is supported by the platen 14 and a plurality of idler rolls 19 which collectively maintain thetop stretch of the belt accurately horizontal.
  • the drive for the conveyor belt indicated generally by the numeral 20, is conventional and comprises a motor and a suitable speed reducer.
  • the conveyor bed is vertically adjustable in the conventional manner, which involves imparting simultaneous actuation of a plurality of nut and jackscrew supports (not shown) by which the conveyor bed is mounted in the-frame of the machine.
  • a hand wheel 21 at the side of the machine and appropriately connected with the nuts on the jack screws provides the means for adjusting the elevation of the conveyor bed.
  • an infeed hold-down shoe 22 is provided.
  • an outfeed hold-down shoe 23 which holds the workpieces down on the platen-supported conveyor belt as they leave the zone of action, and both upstream and down stream of the zone of action there are pinch rolls 24 that coact with the idler rolls 19 of the conveyor bed to hold the workpieces in contact with the conveyor belt and assure their advance through the machine.
  • the planing and sizing of rough lumber with an abrasive belt-type machine poses a problem that is not encountered in finish sanding. This stems from the fact that rough lumber is often warped by internal stresses and its surfaces are anything but uniformly flat. Accordingly, unless the infeed shoe holds the workpiece down directly adjacent to the zone of action, the leading edge or end of the advancing workpiece may be lifted off the platen-supported conveyor belt as it approaches initial contact with the rocking movement of the shoe about a fixed axis, the greater variations in thickness and the uneveness of the surfaces of rough lumber, often lifted the toe of the shoe into contact with the abrasive belt. This was inevitable since the mounting of the shoe constrained it to pivotal movement about a fixed axis so located that the toe of the shoe traveled in an arc that intersected the circumference of the contact drum.
  • This improved mounting features a parallelogram linkage indicated generally by the numeral 25 by which the shoe is connected with the frame of the machine. As depicted in diagrammatic FIG. 4, the linkage makes it possible for the toe 26 of the shoe to travel in an arcuate path delineated by the broken line AP which is substantially concentric with the cylindrical surface of the contact drum delineated by the arc CS.
  • FIG. 4 illustrates the hold-down shoe traveling through a much greater'distance than it does in practice.
  • the parallelogram linkage 25, which is duplicated at opposite ends of the infeed hold-down shoe, comprises a pairof links 27 and 28 mounted to swing about speed parallel horizontal axes fixed with respect to the frame of the machine and lying in a horizontal plane.
  • the links project downwardly from the fixed axes about which they swing, and have their lower end positions pivotally connected with the shoe, the pivot axes of those connections being parallel and horizontally spaced apart the same distance as the aforesaid fixed axes.
  • the fixed axes about which the links 27 and 28 swing are defined by bearings 29 in a bracket 30 that is suitably fixed to the main frame of the machine.
  • bearings 29 has a stub shaft 31 joumalled therein, the other rotatably mounts one end of a shaft 32 that extends across the machine to have its otherend similarly supported.
  • the links 27 and 28 which are of the same length have their upper ends respectively keyed and fixed to the stub shaft 31 and the cross shaft 32, and as best seen in FIG. 6, are laterally spaced from one another so as not to collide during movement thereof as the pressure shoe rises and falls.
  • the axes of the pivotal connections between the lower ends of the links and the shoe, are defined by bearings 33 in an arm 34 fixed to the shoe and projecting rearwardly from its heel.
  • the rearmost of these bearings 33 has one end portion of a stub shaft 35 journalled therein, the other end portion of which is keyed and fixed to the lower end of the link 27; and the other of the two bearings in the arm 34 freely rotatably receives a cross shaft 36 which, like the shaft 32 extends across the width of the machine.
  • a spring 37 one at each end of the pressure shoe, yieldingly urges the shoe towards the contact drum and by virtue of the downward component of the arcute travel of the pivotal connections of the links 27 and 28 to the shoe which results from the approach of the links towards vertical dispositions, the spring force exerts far greater downward pressure on the shoe than would the case if the same spring acted directly downwardly on the shoe.
  • the spring 37 reacts between an arm 38 fixed to and projecting from the end of the shoe, and a nut 39 on a bolt 40 that passes slidably through a hole in the arm 38 and is threaded in and fixed with respect to a laterally projecting flange 41 on the bracket 30.
  • the spring surrounds the bolt and the head 42 of the bolt limits the spring-produced motion of the shoe and thus defines the lowermost limit of the up and down movement of the toe of the shoe.
  • Elevation of the shoe produced in any way in opposition to the spring force is limited by an adjustable stop 43 in the form of a bolt threaded into the flange 41 with its head positioned to be engaged by the arm 38.
  • the shoe 23 at the downstream side of the zone of action is mounted in the conventional way by a cross shaft 44, since it does not encounter changes in elevation of the top surface of the workpiece passing through the machine.
  • first coaxial pivot means rockably connecting the same end of each of said second pair of links with the machine frame
  • the improvement set forth in claim 2 further characterized in that 1. the axes of said first cross shaft and of said first coaxial pivot means lie in a substantially horizontal plane spaced upwardly of the pressure shoe, and 2. the axes of said second cross shaft and of said second coaxial pivot means lie in a substantially horizontal plane spaced downwardly from said other substantially horizontal plane.
  • the means by which the pressure shoe is biased downward comprises a compression spring reacting between the machine frame and the pressure shoe and arranged to urge the pressure shoe horizontally towards the contact zone between the contact drum-supported abrasive belt and the workpiece.
  • the pressure shoe has an endwise projecting rigid arm on each end thereof located between said vertical wall and the contact zone,
  • an endless belt-type sanding machine having a sanding head with an endless power driven sanding belt and conveyor means to carry workpieces horizontally through the machine with the top surface thereof in engagement with the sanding belt of the sanding head, and a pressure shoe to hold workpieces down on the conveyor means, the improvement which comprises:
  • A. linkage means pivotally connected with the pressure shoe and with the frame of the machine, the
  • said linkage means mounting the pressure shoe in the machine and constraining the shoe to movement in an arcuate path having both a horizontal and a vertical component, the former being greater than the latter;

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US00377826A 1973-07-09 1973-07-09 Abrasive belt-type lumber planing machine Expired - Lifetime US3832808A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00377826A US3832808A (en) 1973-07-09 1973-07-09 Abrasive belt-type lumber planing machine
CA185,219A CA994104A (en) 1973-07-09 1973-11-07 Abrasive belt-type lumber planing machine
JP48138908A JPS5136514B2 (enrdf_load_stackoverflow) 1973-07-09 1973-12-14
FI3962/73A FI396273A7 (enrdf_load_stackoverflow) 1973-07-09 1973-12-21

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00377826A US3832808A (en) 1973-07-09 1973-07-09 Abrasive belt-type lumber planing machine

Publications (1)

Publication Number Publication Date
US3832808A true US3832808A (en) 1974-09-03

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Application Number Title Priority Date Filing Date
US00377826A Expired - Lifetime US3832808A (en) 1973-07-09 1973-07-09 Abrasive belt-type lumber planing machine

Country Status (4)

Country Link
US (1) US3832808A (enrdf_load_stackoverflow)
JP (1) JPS5136514B2 (enrdf_load_stackoverflow)
CA (1) CA994104A (enrdf_load_stackoverflow)
FI (1) FI396273A7 (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322919A (en) * 1980-06-27 1982-04-06 Acrometal Products, Inc. Self-centering feed mechanism for an abrasive grinding machine
FR2534839A1 (fr) * 1982-10-20 1984-04-27 Elan Machine automatique a ebavurer des pieces de petites dimensions
US5220750A (en) * 1991-10-23 1993-06-22 Timesavers, Inc. Pressure platen for use in an abrasive finishing machine
US6769958B1 (en) 2002-08-21 2004-08-03 Howard W. Grivna Material removal monitor
US20040235391A1 (en) * 2002-08-21 2004-11-25 Grivna Howard W. Material removal monitor
IT201900015228A1 (it) * 2019-08-29 2021-03-01 Scm Group Spa Macchina levigatrice con sistema di sicurezza contro l’eiezione di pannelli.
US11325171B2 (en) * 2017-02-17 2022-05-10 Samsung Electronics Co., Ltd. Apparatus of manufacturing panel for home appliance and method of manufacturing the home appliance

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6134539A (ja) * 1984-07-26 1986-02-18 Kuraray Co Ltd 感光性組成物
CN110549208B (zh) * 2019-08-26 2021-04-20 安徽舜邦精细化工有限公司 一种圆柱形工件切割面毛刺去除装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791070A (en) * 1956-03-23 1957-05-07 Engelberg Huller Co Inc Abrading machine
US3008276A (en) * 1959-04-30 1961-11-14 Kile Brothers Mfg Company Abrading machine
US3134205A (en) * 1963-03-12 1964-05-26 Canadian Forest Prod Panel sanding apparatus
US3782044A (en) * 1972-05-01 1974-01-01 Timesavers Inc Wide abrasive belt type lumber planing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791070A (en) * 1956-03-23 1957-05-07 Engelberg Huller Co Inc Abrading machine
US3008276A (en) * 1959-04-30 1961-11-14 Kile Brothers Mfg Company Abrading machine
US3134205A (en) * 1963-03-12 1964-05-26 Canadian Forest Prod Panel sanding apparatus
US3782044A (en) * 1972-05-01 1974-01-01 Timesavers Inc Wide abrasive belt type lumber planing machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322919A (en) * 1980-06-27 1982-04-06 Acrometal Products, Inc. Self-centering feed mechanism for an abrasive grinding machine
FR2534839A1 (fr) * 1982-10-20 1984-04-27 Elan Machine automatique a ebavurer des pieces de petites dimensions
EP0108009A1 (fr) * 1982-10-20 1984-05-09 Société ELAN Société à Responsabilité Limitée dite: Machine automatique à ébavurer des pièces de petites dimensions
US5220750A (en) * 1991-10-23 1993-06-22 Timesavers, Inc. Pressure platen for use in an abrasive finishing machine
US6769958B1 (en) 2002-08-21 2004-08-03 Howard W. Grivna Material removal monitor
US20040235391A1 (en) * 2002-08-21 2004-11-25 Grivna Howard W. Material removal monitor
US6913512B2 (en) 2002-08-21 2005-07-05 Howard W. Grivna Material removal monitor
WO2005120776A1 (en) * 2004-06-07 2005-12-22 Grivna Howard W Material removal monitor
US11325171B2 (en) * 2017-02-17 2022-05-10 Samsung Electronics Co., Ltd. Apparatus of manufacturing panel for home appliance and method of manufacturing the home appliance
IT201900015228A1 (it) * 2019-08-29 2021-03-01 Scm Group Spa Macchina levigatrice con sistema di sicurezza contro l’eiezione di pannelli.
EP3795295A1 (en) * 2019-08-29 2021-03-24 SCM Group S.p.A. Sander machine with safety system to prevent the ejection of panels

Also Published As

Publication number Publication date
CA994104A (en) 1976-08-03
FI396273A7 (enrdf_load_stackoverflow) 1975-01-10
JPS5028094A (enrdf_load_stackoverflow) 1975-03-22
JPS5136514B2 (enrdf_load_stackoverflow) 1976-10-08

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