Saw head

The Wimmer saw head impresses with the following features. It is placed at an angle, which results in a softer first cut and cutting and a higher cutting performance. We first delivered the angled Wimmer saw head in 1996. The saw blade runs on cast steel wheels with 850 mm or 1000 mm diameter, which are stored in duplicate in the large size with cylindrical roller bearings. Compared to cast iron, cast steel is characterised by a much longer service life. The solid square or rectangular pipes of the saw blade tensioning system are precisely guided on a total of 16 brass plates with a long support spacing. It is also possible with weaker logs to saw with less pressure without the saw blade drifting, which leads to a further increase of the service life of the saw blade.

Medium tension

We use a medium tension to tension the saw blade. The tension takes place evenly on both sides via a frog.

Running carriage

This is a very stable construction and is again strengthened on top with tied pipes. Lateral pressure rollers on the base frame prevent a rocking of the Wimmer saw head in the upper cutting area. The running carriage runs below the log support on large rollers. The advantage of this is the rollers no longer disturb the log support. The rollers positioned inside are protected from dirt. In addition, the saw carriage runs on the same frame on which the logs also lie. As a result, an exact and dimensionally stable cross section is guaranteed. The tracks can be lubricated automatically with a lubricant pump.

Cast wheel maintenance

The copper scrapers are mounted so that the sawdust immediately falls outwards and not on the saw blade. Generously sized felt pads keep the cast wheel clean and distribute the lubricant evenly. Special baffles for the sawdust prevent swirling so that no sawdust remains in the guards. All copper scrapers and felt pads work with gravity. This prevents disruptions from broken springs. The lubricant is automatically activated by a solenoid valve when the main engine starts and can be dosed accurately by means of a valve. A large container spares the operator from frequent refilling. By request, there is also a pressure lubrication, which also lubricates both cast wheels and the saw blade on the outside.

Height adjustment

The height adjustment of the saw head takes place by means of a geared motor and two roller chains, so that the saw carriage is guided evenly. Two ball bearings each with a wearing ring spaced at a distance ensure a precise guidance of the vertical carriage. The running surface of the ball bearing is increased. In addition, the vertical carriage is also affixed laterally with large adjustable guide pins. This allows a stress-free running of the saw blade and therefore a long service life. This makes an absolutely precise positioning possible via a joystick at the operator station. Almost all of our log band saws today are equipped with an electronic positioning control.

Feed

The feed takes place via a two-sided wire drive, which prevents a jerking of the Wimmer saw head during a load change. We achieve the continuous adjustment by using a frequency converter that has been tried and tested in electrical engineering for years. This is controlled by the same joystick as for the height adjustment. You therefore have a true one-handed operation of the log band saw here from one central operator's station. Another advantage is the simple adjustability of the frequency converter. This allows you to increase the speed with weak logs, which leads to a significant increase in performance. For extremely large logs, the feed rate can be very finely controlled by reducing the frequency. We provide some special features for the feed by request. This starts with the automatic feed and the return via the foot switch to a fully automatic system.

 

Blade guide

Two adjustable Chaco guides accurately guide the Wimmer saw blade. The material of the pads is very low-wear and has been used successfully for decades in log band saws. The guide itself is very sturdy and is welded to the band guide arm and not screwed in. This prevents the guide from adjusting itself during faulty operation. The band guide arm is guided on brass plates and tensioned with a prism, which guarantees an absolute precise guidance. A copper scraper serves as the first sawdust deflector. As a second sawdust scraper, a wear-free stainless steel scraper is attached to the main frame. The adjustment of the blade guide is also available hydraulically.

 

Electric motor - Switch cabinet

The Wimmer saw blade drive is powered by an electric brake motor.  This has the advantage that it is quiet, emission-free, durable and vibration free compared to an internal combustion engine. The large-sized switch cabinet is easily accessible from the outside with mobile log band saws and nonetheless is attached to the base frame in a protected manner. By request, a removable protective plate is available. For stationary log band saws, the switch cabinet is not mounted to the Wimmer saw. It is mounted in an exposed position protected from dirt.

Precutter

The precutter uses a carbide-tipped circular saw blade to remove dirty bark and stones on the blade inlet side, thereby increasing the service life of the saw blade significantly. It is attached directly to the saw head and has a short pivoting arm, so that it always keeps its exact position. The cutting depth can be adjusted for different types of wood. A spring suspension protects it from damage during faulty operations. It is also possible to attach a left precutter to the cutout side.

Shavings box

The shavings box collects the sawdust and empties it at any point after hydraulic actuation. With our PLC control, it is also possible to perform an automatic emptying.

 


Zenz Landtechnik GmbH
Lengmoos 10 | D-83536 Gars am Inn

phone: +49 (0)8072 / 9194 - 0
f a x: +49 (0)8072 / 9194 - 30
mail: info@zenz.de


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