Log bandmill modules with highest precision and flexibility for quality-orientated large log sawing

Log bandmills

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Bandsaw Technology

Log bandmills

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Log bandmills

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Bandsaw Technology

Log CarriagesEW 1000

The headblocks The headblocks are made in extra heavy, shock-resistant welded steel construction and are moved on precision ma-chined block supports. All lumber supports are hard-chrome plated and exchangeable. All headblocks have independent positioning by means of servo-hydraulic setworks with very high setting speeds and can therefore be adapted to every log shape. The clamping is done hydraulically. The applied pressu-re can be adjusted stepless by remote control from the opera-tor panel to suit the sawing requirements. To keep a low build height, each headblock is equipped with two upper dogs, which are applied according to log size. The dogs can be adjusted independently from the headblocks. This function allows to ad-just the dog standout position stepless and to pull the lumber against the vertical supports to ensure dimensional accuracy of even the last board being sawn.

The log turners Log turners are on board mounted and are available as single chain arm turners or V-type double arms to provide for fast turning in both directions. The spacing of the log-turners can be customized to individual requirements.

The slab turners The slab turners allow the fast turning and putting upright of half-sawn logs or slabs.

The carriage frame and running drive The high precision of the carriage running drive and track con-tributes significantly to the accuracy of the sawn lumber. The wheels are made of tempered, wear resisting special steel and are generously sized with a diameter of 300 mm and wide wheel faces.

The headblock forms a unit with an own axle and a pair of wheels, to avoid any flexing of the carriage frame. This design allows the spacing of the headblocks to be customized to suit the individual requirements.

The carriage drive The carriage drive is generally done separate from the log bandmill with an own drive system to have always constant drive situations, i.e. with frequency converter drives. The choice available is between a compact hydrostatic drive system with a gearless low revolution drive motor or a highly dynamic electric drive system with a frequency-converter controlled gear motor. Both drive concepts are equipped with a strongly dimensioned steel rope and winch drum. With the electric drive system, a regenerative drive concept is available as an option.

The hydraulic system All movements for log/lumber manipulation on the carriage are hydraulic and the required supply of hydraulic power is provi-ded from a stationary power unit. This reduces the carriage masses required to be moved and increases the dynamics.

The power supply system Hydraulic, electric power and bus control cables are connected to the carriage via a top-mounted low wear Flex Power Chain.

The central oil lubrication The automatic central oil lubrication supplies all slide move-ments of carriage and rails and thus reduces the maintenance work drastically.

V-On-board log turner

Slab turnerLog carriage EW 1000

Log bandmills

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Bandsaw Technology

Log bandmills Modul EBB1�00, 1600, 1800 (optional with double cut, slabber)

The bandmill wheels Due to the high stresses, both wheels are made from high quality spheroid graphite iron. The surface hardness of thismaterial allows years of operation without needs to regrind the wheels. The design of the wheels has been optimized by FiniteElements computer calculations. The solid bottom wheel with it‘s higher momentum always pulls the band through the cut.

The saw blade guides The saw guides are cartridge type pressure guides,pressing the saw blade out of the vertical line during the cut. To avo-id any collision between clamped log and the saw blade during the return move of the carriage for the next cut, the bandmill with the saw is set back hydraulically, controlled by an initiator sensor. The top guide is height adjustable with a hydraulic cylinder. The bandmill is set on guides and can be fitted optionally with a servo-hydraulic setwork. Thus the maximum opening between headblock and band-saw can be increased to 1400 mm for oversize logs. The bandmill is optionally available with wheels for double cut action.

The wheel inclination For precise alignment of the sawblade running the top wheel is tilted with an electric motor with remote control.

Controls and comfort of operation • Industrial type PC, operator terminal and color monitor• Windows operator interface with menu-driven controls• Permanent display of all important values and parameters• Extensive operation messages displayed in plain language, with test and service functions• Ergonomically designed, comfortable operator’s control chair• Quick and easy operation, full operator control and overridefunctions• Automatic knee setting for next cut, selection of fixed board dimensions and next cut dimension with hot keys.• Automatic positioning of the carriage for reloading and automatic selection of the required carriage knees and log turners• Reduced wiring work, short start-up times and easy maintenance and trouble-shooting because of decentralized control design.

Options• “Optiline”-system with real-time display of the saw line and display of selected sawing dimensions on the log or cant• Log scanning• Automatic positioning of the log or cant• Optimization for center products and side boards• Production and shift reports• Software for processing of custom sawn timber• Automatic carriage feed speed control based on sawing speed, saw performance and motor load (option only available with frequency converter control for drive motors)• Double cut action set-up• 17°slanted bandmill and carriage

Ergonomic operator cabin and controls

Circular saw unit for vertical and horizontal rip-cutsLog bandmill EBB 1800 for double cut action, slabber unit PF 19 and carriage EW 1000

Log bandmills

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Log bandmills

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Bandsaw Technology

Tandem–Log bandmills Modul EBB V/�Tandem-Log bandmills (optional with double-cut action, slabber)

The systems The Tandem Log bandmills can, together with the slabber unit open the log and saw off 2 boards in one pass. The EBB V/2 + PF 19 (Tandem Log bandmill and slabber unit) cuts only on the forward pass of the carriage.The first bandmill has a servo-hydraulic setwork for positioning. The second bandmill is pulled back hydraulically for the return pass of the carriage by an initiator.

The patented version EBB VR/2 + PF 19 (Tandem-Log Bandmill with double cut action and slabber unit) cuts on the forward pass of the carriage and if desired or necessary on the return pass as well. Both bandmills have servo-hydraulic setworks.The first saw entering the log makes the outer cut. The respective second saw makes the inner cut. The use of the EWD Tandem Bandmill system with forward and backward sawing action can increase the sawn volu-me performance, compared to a conventional single band headrig by up to 250 % (please see the production compa-rison on the next page).

The application The Tandem Log Bandmills are normally used as primary breakdown machines. They can however –in the double cut mode –also do the resawing. Based on the sawmill size and production program, a Tandem Log bandmill system can be combined with an automatic edger system with sawing heights up to 120 mm or a combination edger/gang sys-tem with sawing heights up to 225 mm or a resawing center with highly flexible single arbor circular saws with sawing heights up to 225 mm or double arbor circular resaws with sawing height of up to 360 mm.

The operation The operator can always decide if he wants to use just one saw or both saws for a pass, depending on the individual circumstances. Logs can be processed in a semi-automatic mode, based on a selected sawing pattern, if the log quality does not require a grade sawing breakdown.

Sawing two products at each pass forward and backward

Resawing in forward and backward modeTandem-Log Bandmill EBB 1800 with forward/backward sawing, slabber unit PF 19 and carriage EW 1000

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Bandsaw Technology

Productivity comparisonof the log bandmill versions under identical conditions

Log bandmill layoutsLayout samples

Tandem headrig EBB 1800 VR/2 + PF19 with combination op-timizing edger/gang system OptimesLine and BNK 6. Larger cants are resawn on the tan-dem headrig

Tandem headrigEBB VR/2 + PF19 with flexible double arbor gang and optimizing edger system OptimesLine. When processing large logs only, the mill ca-pacity exceeds 50.000 m² log intake/year and shift.

Tandem headrigEBB VR/2 + PF19 S in combination with a se-cond primary breakdown machine, i.e. a frame saw or a double arbor circular saw DWK SG. Cants are processed by a flexible double arbor resaw DWK6, boards are sent to an automatic optimizing edger system OptimesLine.

Only primary breakdown Primary and secondary breakdownOnly primary breakdown The comparativfigures are based on calculations

Modul headrig size: EBB 1800

D=40 cm D=50 cm D=60 cm

1 2 3

4

1

2

3

4

100% 100% 100%

1��% 11�% 11�%

1��% 1��% 1�8%

1��% 18�% �1�%

1��% �0�% �6�%

Saw pattern

Equipment

D = �0 cm D = �0 cm D = 60 cm

EBB V/1

PF 1� + EBB V/1

PF 1� + EBB VR/1

PF 1� + EBB V/�

PF 1� + EBB VR/�

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Bandsaw Technology

Log bandmills-Module EBBFunctions and technical components

Technical dataBandsaw carriage, Log bandmills-Modules, Slabber PF 1�

The hydraulic strain system The sawing accuracy of a bandsaw depends heavily on the bandsaw strain system. The EWD strain system offers a very fast reaction time and instantaneous shockabsorption. One short stroke, quick reaction hydraulic cylinder provides strain, which can be adjusted infinitely to create the saw strain from 0 - 200 N/mm². The saw strain is then automatically kept constant, even when encountering different sawing loads, such as changing log density or knots.

The wheel bearings The saw strain is directly transferred to the machine frame by utilizing the dead arbor concept. The drive shaft is thereby not loaded with bending stresses. Advantage: minimum bearing wear, highest precision and smooth running.

Carriage EW 1000

Headblock opening vertical / horizontal max. mm 1000 / 1400Track width mm 1300Headblock set speeds max. mm/s 500Carriage speed max. m/min 200Carriage drive power kW 30 - 45

Log bandmill Modules EBB 1�00

Wheel diameter mm 1400 1600 1800Wheel face width mm 160/200 190/230 190/230Saw blade width mm 180/206 206/250 206/250Saw blade thickness max. mm 1,47 1,65 1,83Saw blade strain max. N/mm² 200 200 200Saw blade speed max. m/s 55 55 55Drive motor size kW 55 - 75 75 - 90 90 - 132

Slabbber PF 1�

Slabber head diameter mm 1240No. of main knives pcs. 3, 4, 6Chipping depth max. mm 190Chipping height above log support max. mm 670Set distance incl. park situation mm 0 - 850Feed speed m/min 20 - 150Drive motor size kW 75 - 132 (@ 1500 rpm)Machine weight w/ drive motor (132 kW) t 5

EBB 1800EBB 1600

a b

c d

a Clamping cylinderb Dog travel cylinderc Large log dogd Small log dog

b c d e a

a Bottom wheelb Drive shaftc Dead arbord Machine framee Drive pulley

Due to constant product improvements or developments the illustrations and specifications contained in this brochure are subject to change without notice.

Esterer WD GmbHEstererstraße 1284503 Altötting, Germanyphone: +49 (0)86 71 - 5 03 - 0fax: +49 (0)86 71 - 5 03 - 386 e-mail: info@ewd.deinternet: www.ewd.de

Esterer WD GmbHTäleswiesenstraße 772770 Reutlingen, Germanyphone: +49 (0)71 21 - 56 65 - 0fax: +49 (0)71 21 - 56 65 - 400 e-mail: info@ewd.deinternet: www.ewd.dewww.ewd.de

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