Cutlery – Razors – Detachable blade – guarded cutting edge
Reexamination Certificate
2000-11-29
2002-07-23
Watts, Douglas D. (Department: 3724)
Cutlery
Razors
Detachable blade, guarded cutting edge
C030S058000
Reexamination Certificate
active
06421919
ABSTRACT:
The invention relates to a device for setting saw blades or belt-saw blades with clamping jaws arranged on both sides of the saw blade or belt-saw blade and with setting tools arranged on both sides and pivotable about an imaginary axis.
Such a device is known from DE 195 17 482 A1.
With the known device the setting tools of both sides are held in each case in a basic position in which both setting tools bear without clamping on both sides of the saw blade and with their head surfaces facing the teeth enclose a head surface angle which is larger than or at the most equal to the setting angle enveloping the set teeth. From this it results that the setting tool may no longer be advanced in the direction of the saw blade for each setting procedure. The setting tools are held in the clamping-free position, wherein a slight contact by the saw blade and the head surfaces of the setting tools may arise with the travelling through of the saw blade. From the mentioned document it is also known to guide the setting tools on a circular pivoting path. The clamping jaws are with this operated hydraulically.
The known device has in practise the disadvantage that on account of the contact, even if small, of the setting tools with the saw blade on travelling through, there occur losses of sharpness, and material wear. Furthermore with the known design form there is the problem that belt-saw blade thickness fluctuations of the saw blade or belt-saw blade lead to a worsening of the setting result. On account of this in the mentioned document it is suggested to carry out a thickness detection of the saw blade and to compensate the fluctuations via electronics. This entails an enormous cost expense.
BRIEF SUMMARY OF THE INVENTION
It is the object of the present invention to put forward a new device with which the setting result may be improved.
This object is achieved with the initially mentioned device in that in horizontally displaceably mounted guiding blocks arranged on both sides of the saw blade or belt-saw blade there is pivotably mounted in each case a setting tool mounting formed as circle segment, wherein the guiding block is designed simultaneously as a clamping jaw for fixing the saw blade or belt-saw blade, and that displacement devices are provided for the horizontal displacement of the guiding blocks.
After each setting procedure the setting tool mountings and the setting tools fastened thereto in the setting tool bearing are pivoted on a part circular path. With this there is actuated a displacement mechanism which moves the guiding blocks outwards. Since the guiding blocks simultaneously serve as clamping jaws for fixing the saw blade or belt-saw blade with the setting procedure, these release the saw blade or belt-saw blade. The saw blade or belt-saw blade then without contacting the clamping jaws or the setting tool, may be transported further.
This manner of design may be observed as a floating mounting of the whole system. With this the great advantage is that the thickness fluctuations of the saw blade or belt-saw blade are automatically compensated since the saw blade is always exactly centrically fixed. This is possible since the setting tool mountings with the setting tools and the guiding blocks serving simultaneously as clamping jaws form one unit. By way of the horizontal displaceability of the guiding blocks each change in thickness is automatically compensated. From this it results that one may do away with a electronic thickness measurement and the evaluation and compensation electronics which this entails. This saves costs and makes the whole device more robust and less prone to breakdown;
A further enormous advantage lies in the fact that one may completely do away with pneumatic or hydraulic devices. The design expense is by way of this considerably reduced, maintenance costs too are reduced by way of this and the maintenance intervals are lengthened. The application of pneumatic or hydraulic devices with the setting of saw blades or belt-saw blades is therefore also problematic since these devices in comparison to purely mechanical devices have a higher inertia.
According to a further embodiment form of the invention the setting tool bearing is designed as a sliding bearing. Sliding bearings are very low-maintenance and offer a high guiding accuracy of the setting tool mounting, this accuracy being compellingly necessary for an exact setting process.
A particularly, advantageous further formation of the invention envisages that at least one guiding block, preferably both guiding blocks are traversable outwards by way of a displacement device which is releasable on pivoting the setting tool mounting out of the setting position so that the saw blade is released from the clamping jaws. By way of linking these procedures the accuracy of the setting procedure is increased even further. Thus without a great control expense it is possible to move the guiding blocks to the outside when the setting tools move away from the setting position. The point in time at which this is effected is on account of the lining always equal. The saw blade or belt-saw blade is released and may then be transported further.
According to a particularly advantageous embodiment form of this displacement device it is envisaged that in each case at least one shaft rotatable mounted in each guiding block, with a radially protruding lug via at least one carrier pin on the setting tool mounting is actuatable on pivoting the setting tool mounting out of the setting position, and that this shaft is coupled to at least one rod fastened in the housing block such that the guiding block on actuation of the shaft is moved outwards. If the setting tool mounting is pivoted out of the setting position a carrier pin fastened to this setting tool mounting or connected to this with a non-positive fit, engages into a lug projecting radially from a shaft. By way of further pivoting of the setting tool mounting downwards, the carrier pin by way of pressing down the lug “forces” the shaft into a rotational movement. Since the shaft is coupled to at least one rod fastened in the housing, this rotational movement is converted into a horizontal movement of the guiding blocks to the outside. The coupling may for example be effected via pinions or rods. This very effective manner of construction permits absolute precision and avoids the application of expensive control electronics.
According to a further very advantageous further formation of the invention the carrier pin is connected to the setting tool mounting with a non-positive fit. The setting tool mounting and carrier pin must therefore not be manufactured as one component. The manufacture is simplified. Furthermore there result further design possibilities, e.g. the coupling of the carrier pin to the drive unit.
So that the guiding blocks after the displacement to the outside may again be uniformly displaced into a central setting and fixing position, at least one guiding block, preferably both guiding blocks after unloading the displacement device, by way of a leading-back device are displaced in the direction of the saw blade or belt-saw blade. By way of this it is achieved that the saw blade or belt-saw blade after the further transport is again fixed and may be set.
According to a further very advantageous embodiment form of the invention the leading-back device consists of a disk spring assembly. This disk spring assembly is preferably mounted between the housing and the guiding block. If the guiding block is moved outwards by pivoting the setting tool mounting, this is effected against the spring force of the disk spring assembly. If the displacement device is unloaded, i.e. the carrier pin again moves away from the lug and releases this, the guiding blocks are moved away from the housing in the direction of the saw blade or belt-saw blade. This very simply designed leading-back device is very efficient, inexpensive and maintenance-free. Furthermore it is ensured that both guiding blocks are displaced in the direction of the saw blade or belt-saw blade wi
Fa. Georg Kesel GmbH & Co. KG
Notaro & Michalos P.C.
Watts Douglas D.
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