US3507161A - Driving endless metal bands - Google Patents

Driving endless metal bands Download PDF

Info

Publication number
US3507161A
US3507161A US780025A US3507161DA US3507161A US 3507161 A US3507161 A US 3507161A US 780025 A US780025 A US 780025A US 3507161D A US3507161D A US 3507161DA US 3507161 A US3507161 A US 3507161A
Authority
US
United States
Prior art keywords
band
heat
bands
tendency
cooling
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
US780025A
Other languages
English (en)
Inventor
Earl D Hasenwinkle
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.)
Weyerhaeuser Co
Original Assignee
Weyerhaeuser Co
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 Weyerhaeuser Co filed Critical Weyerhaeuser Co
Application granted granted Critical
Publication of US3507161A publication Critical patent/US3507161A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D3/00—Veneer presses; Press plates; Plywood presses
    • B27D3/04—Veneer presses; Press plates; Plywood presses with endless arrangement of moving press plates, belts, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors 
    • B65G39/10—Arrangements of rollers
    • B65G39/12—Arrangements of rollers mounted on framework
    • B65G39/16—Arrangements of rollers mounted on framework for aligning belts or chains

Definitions

  • a method and apparatus are disclosed for driving an endless metallic band in a controlled path.
  • the band is rotated in one circumferential direction thereof, and a temperature differential is generated between the edge portions of the band, so as to vary the relative lengths of the portions while the band is rotating.
  • the lateral displacement of the band is controlled so as to steer it in one lateral direction thereof; or to neutralize a tendency for the band to steer in one lateral direction thereof.
  • the temperature differential is normally initiated after the band has commenced rotating.
  • This invention relates to endless metallic bands, and in particular to a method and apparatus for driving such bands in controlled paths.
  • the invention is especially applicable to the driving of endless metallic bands in continuous presses, such as the presses used in laminating sheet wood material.
  • it is also applicable to the driving of endless metallic bands in other situations, as for example, where such bands are employed in saws, baking ovens, and mechanical conveyors.
  • One object of the present invention is to devise a means and technique whereby endless metallic bands can be driven in controlled paths. Another object is to devise a means and technique whereby endless metallic bands can be driven in stable rotational paths having substantially no lateral displacement; or in rotational paths having a controlled displacement in either lateral direction thereof. A further object is to devise a means and technique of this nature whereby endless metallic bands can be driven in controlled rotational paths either under tension or without tension.
  • each band is rotated in one circumferential direction thereof, and a temperature differential is generated between the edge portions of the band so as to vary the relative lengths of the portions While the band is rotating.
  • the lateral displacement of the band is controlled so as to steer it in one lateral direction thereof; or to neutralize a tendency for the band to steer in one lateral direction thereof.
  • the temperature differential is initiated afterthe band has commenced rotating.
  • the band may be either operationally stable or operationally unstable in a lateral sense. When an instability develops, it may be neutralized before a displacement occurs, or only after it occurs.
  • the band may be rotated by a drive wheel having the band engaged thereon; or it may be rotated by a drive surface moving in engagement therewith.
  • the temperature differential has an opposite effect from one situation to the other, with respect to the dimtion of displacement.
  • the temperature differential may be generated by either heating or cooling, or by both techniques. For example, it may be generated by heating one edge ortion of the band in relation to the other; or by cooling one in relation to the other; or by simultaneously heating one while cooling the other. Also, the differential may be generated by heating one edge portion while simultaneously cooling both portions, or by cooling one portion while simultaneously heating both. The heating or cooling effect may be generated at only one circumferential point on an edge portion; or at a number of such points up to the full cir curnference of the band.
  • the differential generating means comprises means for applying heat to one edge portion of the band while it is rotating.
  • the heat application means is normally accompanied by means for sensing a tendency for the band to undergo lateral displacement from its normal position.
  • the signal provided by this sensory means may be observed by an operator who exercises manual control over the heat application means; or there may be additional means responsive to the signal to cause the heat application means to apply heat to the one edge portion of the band until the tendency is neutralized.
  • the sensory means anticipates each upcoming displacement to the extent that heat is applied to the edge portion to neutralize the tendency before any displacement actually occurs. Sensory means of this capability are known in the art.
  • My preferred embodiments also include means for cooling both portions of the band at a uniform rate while it is rotating, so as to assure that the band maintains a tolerable temperature throughout the operation.
  • FIGURE 1 is a schematic isometric representation of an automatically controlled system in which the band is rotated by a moving drive surface in engagement therewith;
  • FIGURE 2 is a schematic plan representation of the band in FIGURE 1, illustrating the physical phenomenon responsible for its tendency to displace;
  • FIGURE 3 is a similar representation illustrating the physical phenomenon responsible for the displacement of a band rotated on a pair of parallel drive wheels
  • FIGURE 4 is a schematic plan representation of a system for correcting the displacement of the band in FIGURE 3.
  • FIGURE 5 is a schematic plan representation of a manually controlled system for stabilizing a band.
  • the band 2 shown in part in FIGURE 1 is mounted on a pair of arcuate shoes 4 disposed within the curved bights 2 thereof.
  • Each shoe 4 comprises a pair of mutually opposing bracket plates 6 having a series of rollers 8 journalled therebetween at angularly spaced points around the rim of the shoe.
  • the rollers provide freewheeling support for the band while it is rotated in one circumferential direction thereof.
  • the driving force is provided by a plate surface moving lengthwise under and in frictional engagement with the lower flat 2" of the band. While in rotation the band may serve an active or a passive role.
  • it may act as a moving electrical contact for the surface 10, or it may act as a continuous slip sheet for a workpiece 10, as in the case of the slip sheet shown in the continuous laminating press of U.S. Patent No. 3,044,111 wherein the work piece is a laminar assembly of wood sheets.
  • a band such as that illustrated in FIGURE 1, cannot always be counted on to have, or to maintain dimensional uniformity.
  • a slight difference in edge length may have been fabricated into the band; or during its use the band may have developed a slight difference in edge length.
  • the band will have a slight curvature from one bight 2' to the next; and as a consequence, will not track in alignment with the plate surface 10, but instead will tend to roll or steer toward its shorter side, much as the frustum of a cone rotates about its projected point. See the schematic illustration of FIG- URE 2. wherein the band 2 has a tendency to undergo lateral displacement in the left-hand direction of the view, because it is shorter on that side.
  • this tendency can be neutralized by generating a temperature differential across the width of the band, so as to vary the relative length of its edge portions.
  • a temperature differential across the width of the band so as to vary the relative length of its edge portions.
  • FIGURE 1 A more sophisticated system which is automatically controlled is illustrated in FIGURE 1.
  • a pilot operated gas burner 12 is mounted adjacent the bight 2' of the band so that the flame of the burner impinges on the left-hand edge portion thereof.
  • the burner fuel is fed through a solenoid-operated gate valve 14, the solenoid of which is activated and deactivated by means of a microswitch 16 which is opened and closed by an adjustable limit control 18 arranged to straddle the bight of the band.
  • the limit control comprises a threaded rod 20 having a pair of position contacts 22 on the ends thereof.
  • the rod is pivotally connected to a lever 24 which actuates the microswitch, and in the operation of the system, any lateral displacement of the band which abuts it with one of the position washers 22., closes or opens the switch 16 to activate and deactivate the burner 12.
  • the heating effect may be discontinuous or it may be proportionate to the tendency to displace.
  • various other means such as a hot contact shoe, an electrically or gas heated conductive plate, or radiant means such as an infrared lamp, may be used to heat the band.
  • the heat need not be applied at one point only.
  • a strip heater can be employed around the entire band.
  • the temperature control illustrated by the burner 12 may be duplicated on the opposite side of the band, or the burner may be mounted on a gantry (not shown) to be applied selectively to either side. Also, a refrigerated shoe or other means for selectively cooling one of the edge portions of the band, may be substituted for the heat applicator.
  • FIGURE 5 a manually controlled system for a press is illustrated, together with a water-spray tunnel 26 for maintaining the entire band at a tolerable temperature.
  • the tunnel straddles at least one of the flats as it travels between the directional change guides (not shown) for the system.
  • the band position detector 28 feeds its signal to a control relay 30 which is under the control in turn of the main press control (not shown), so that an operator can selectively actuate the burner 12 to furnish heat to the band 2 as necessary.
  • a rotating band such as that shown at 2 in FIGURE 3, can be laterally controlled by canting the axis of each wheel 32 to the band, as illustrated in FIGURE 4.
  • the band remains unstable in the sense of being readily displaceable in one lateral direction or the other, and especially in the direction of its longer side.
  • this lateral instability can be used to advantage, for example, to offset an external thrust on the band as in the operation of large bandsaws, or to achieve a positive displacement of the band for cutting purposes.
  • the portion of the toothed edge of the saw between the wood and the driving Wheel is stretched, thus causing the band to contact the wheel out of perpendicular. This in turn results in a thrust against the body of the wood, either as a counterthrust to the feed of the same, or as the driving force to feed the saw through the wood.
  • FIGURE 4 also illustrates a system of coordinated temperature controls 34, either for heating or cooling the edge portions of the band, or both.
  • the controls are coordinated by a heat control 36 which is responsive to a position detector 28.
  • a method of driving an endless metallic band in a controlled path comprising rotating the band in one circumferential direction thereof, and generating a temperature dilferential between the edge portions of the band so as to vary the relative lengths of the portions while the band is rotating.
  • Apparatus according to claim 12 further comprising means for sensing a tendency for the band to undergo lateral displacement from the normal position thereof.
  • Apparatus according to claim 13 further comprising means responsive to a signal from the sensory means to cause the heat application means to heat the one edge portion of the band until the tendency is neutralized.
  • Apparatus according to claim 12 further comprising means for cooling both edge portions of the band at a uniform rate while it is rotating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
US780025A 1968-11-29 1968-11-29 Driving endless metal bands Expired - Lifetime US3507161A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US78002568A 1968-11-29 1968-11-29

Publications (1)

Publication Number Publication Date
US3507161A true US3507161A (en) 1970-04-21

Family

ID=25118326

Family Applications (1)

Application Number Title Priority Date Filing Date
US780025A Expired - Lifetime US3507161A (en) 1968-11-29 1968-11-29 Driving endless metal bands

Country Status (5)

Country Link
US (1) US3507161A (enrdf_load_stackoverflow)
JP (1) JPS4827832B1 (enrdf_load_stackoverflow)
DE (1) DE1959590A1 (enrdf_load_stackoverflow)
FR (1) FR2024957B1 (enrdf_load_stackoverflow)
GB (1) GB1221388A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738988B4 (de) * 1996-09-06 2008-05-29 Bosch Rexroth Mechatronics Gmbh Linearführungseinheit
US20150174947A1 (en) * 2012-07-24 2015-06-25 Berndorf Band Gmbh Method for structuring a press belt
CN107963418A (zh) * 2017-12-19 2018-04-27 福建龙净环保股份有限公司 一种输送机调心装置
US10774739B2 (en) * 2018-01-22 2020-09-15 Ford Motor Company Method and system for detecting misalignment of a front end accessory drive belt

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE415159B (sv) * 1975-07-02 1980-09-15 Baehre & Greten Omlenkningsmedel for drivbara endlosa stalband, vilka er anordnade i kontinuerligt arbetande pressar for framstellning av span- och/eller fiberplattor
AT500102B8 (de) * 2001-05-23 2007-02-15 Tgw Transportgeraete Gmbh Verfahren und vorrichtung zur regelung der temperatur eines antriebsorganes
DE102005024692A1 (de) * 2005-05-30 2006-12-07 Kaindl Flooring Gmbh Vorrichtung zur Herstellung eines Zwischenprodukts oder des Endprodukts der Fertigung von Platten auf Holzbasis
AT510198B1 (de) * 2010-04-01 2012-05-15 Univ Wien Tech Verfahren und vorrichtung zur seitlichen lageregelung eines metall-prozessbandes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738988B4 (de) * 1996-09-06 2008-05-29 Bosch Rexroth Mechatronics Gmbh Linearführungseinheit
US20150174947A1 (en) * 2012-07-24 2015-06-25 Berndorf Band Gmbh Method for structuring a press belt
US9751359B2 (en) * 2012-07-24 2017-09-05 Berndorf Band Gmbh Method for structuring a press belt
CN107963418A (zh) * 2017-12-19 2018-04-27 福建龙净环保股份有限公司 一种输送机调心装置
CN107963418B (zh) * 2017-12-19 2023-11-14 福建龙净环保股份有限公司 一种输送机调心装置
US10774739B2 (en) * 2018-01-22 2020-09-15 Ford Motor Company Method and system for detecting misalignment of a front end accessory drive belt

Also Published As

Publication number Publication date
FR2024957A1 (enrdf_load_stackoverflow) 1970-09-04
JPS4827832B1 (enrdf_load_stackoverflow) 1973-08-25
DE1959590A1 (de) 1970-06-11
FR2024957B1 (enrdf_load_stackoverflow) 1974-03-01
GB1221388A (en) 1971-02-03

Similar Documents

Publication Publication Date Title
US3807004A (en) Device for drawing thermoplastic sheet material
US2372737A (en) Torch for welding thermoplastic material
US3507161A (en) Driving endless metal bands
US4334468A (en) Double belt press
ES331850A1 (es) Un metodo de formar relieves en una lamina de material textil deformable.
KR940018176A (ko) 플레이트 연속 제조방법 및 장치
US2490819A (en) Making laminated lumber
US3015146A (en) Method and apparatus for compacting web materials, such as fabrics
US3257488A (en) Method for the orientation of a continuous sheet material by means of stretching, and apparatus for use in the method
GB1055564A (en) Improvements in or relating to continuous presses
US3246365A (en) Apparatus for hot embossing continuous webs
US4173611A (en) Process for feeding a moving web to a stenter apparatus
DE3168687D1 (en) Grinding machine for plate-shaped workpieces
US4778373A (en) Apparatus for continuous heated pressing of material in sheet form
US3235933A (en) Method for compacting fabric
US2739628A (en) Apparatus for edge splicing of wood veneers
US3756588A (en) Centering guide
US2787046A (en) Rolling process and apparatus
US3570051A (en) Apparatus for biaxially stretching foil sheets or webs
US2504673A (en) Jointing and gluing machine
US4210987A (en) Apparatus for feeding a moving web to a stenter apparatus
RU2702665C1 (ru) Способ повышения жесткости круглой пилы
US2627291A (en) Press for laminated lumber
US4899410A (en) Continuous fabric treatment process
JPH0722984B2 (ja) オーバレイボードの連続製造装置および製造方法