Device for cutting any width of wood or other materials

Details Device for cutting any width of wood or other materials Device for cutting any width of wood or other materials

1999-09-17

2002-05-28

Rachuba, M. (Department: 3724)

Cutting

Rotatable disc tool pair or tool and carrier

Tool pair comprises rotatable tools

C083S499000, C083S508300, C083S698610

Reexamination Certificate

active

06393956

ABSTRACT:

DESCRIPTION
The invention relates to a device for cutting wood or other materials to a width of any size according to the preamble of claim
1
.
A cutting device of this kind is used inter alia in commercially available multi-blade or circular trimming saws. The main design structure of these appliances is described by way of example in the Holz Lexikon of E. Konig, DRW Verlags GmbH, Stuttgart, 1977, 2
nd
edition, Volume I : pps. 101-102 and Vol. II : pps. 468-469. These types of circular saws generally have two or more circular. saw blades set on a drive shaft wherein the distance between the blades is variable.
In order to guarantee a free cutting, the circular saw blades are designed mostly wider in the cutting area for example by setting the saw blade. A resulting cutting width is thus produced from the distance of the side cutting edges of two adjoining circular saw blades. However the resulting cutting widths can generally only be inadequately anticipated just by measuring the distance. Frequently after a rough pre-setting a test sample has to be cut followed by finer re-adjustment.
Adjusting the cutting widths is undertaken in the simplest case by a multi-blade saw box which is assembled outside of a machine and on which the individual saw blades are placed, spaced out and fixed for no further adjustment. When changing a blade the saw box is replaced as a whole in order to keep the times during which the machine is stationary as short as possible.
With these machines changing the cutting width is only possible by a time-consuming labour-intensive tool change since the saw blades which are once located in the machine can no longer be axially displaced on the drive shaft. In the event of re-adjustment the complete saw box has to be dismantled again so that for example the relevant cutting width can be adjusted to the required extent for example by inserting further spacer members.
These drawbacks are overcome in appliances where a variable cutting width adjustment is undertaken by electronically controlled, motor-operated or hydraulically-operated axial displacement of one or more saw blades. In the company catalogue 2/94 “Multi-blade circular saws and circular trimming saws” of Messrs. Interholz Raimann GmbH a four-fold blade adjustment system is illustrated on page 12, FIG. 6. Each of the individual saw blades is mounted on a separate displacement head which guarantees by means of a gripper-like arm through a motor-driven spindle an axial displacement and accurate positioning of each individual saw blade. Positioning the individual saw blades and any re-adjustment which might possibly be required are thereby effected through electronic path measuring devices and accurately controlled spindle motors.
Appliances of this kind are very cost-intensive and can only be used economically in the case of cutting widths which have to be frequently changed. The same drawbacks arise also for the circular saws described in WO 89/10824 whose four driven axles provided with circular saw blades are adjustable separately by servo cylinders. Further drawbacks of the motor-driven adjustable multi-blade and circular trimming saw blades described above are the limited number of saw blades which are to be used at the same time as well as the greater minimum cutting width compared to multi-blade saw boxes since the comparatively wide construction of the displacement heads does not allow the individual saw blades to be positioned closely next to each other.
Furthermore from U.S. Pat. specification 15 25 323 a device is known for cutting materials to any width which has two circular saw blades (
12
,
12
′) which by means of a centrally aligned drive shaft (
11
) execute a rotational cutting movement and wherein to vary a cutting width at least one circular saw blade is mounted axially displaceable on the drive shaft wherein disc-like support bodies (
50
,
60
) are provided mounted axially displaceable on the drive shaft and on which at least each one circular saw blade (
12
) is to be fixedly mounted wherein the axial displacement of the circular saw blades is carried out by means of guide spindles (
52
,
62
) running parallel to the axis of the drive shaft (
11
) and passing through the support bodies and which during the circular cutting movement of the circular saw blades are moved on a circular path about the axis of the drive shaft (
11
).
The object of the invention is to develop a device for cutting wood or other materials to a width of any size, which provides a flexible, cost-effective displacement which can be carried out inside the machine and which can be reliably fixed during the sawing operation wherein the cutting widths can be controlled and adjusted by means of a suitable measuring system.
This is achieved according to the invention through a cutting device having the features of claim
1
.
According to the invention the cutting device has disc-shaped support bodies mounted axially displaceable on the drive shaft and on each of which at least one circular saw blade can be fixedly mounted by means of a suitable saw blade socket. Axial displacement of the circular saw blades takes place by means of guide spindles running parallel to the drive shaft axis and passing through the support bodies wherein the guide spindles are moved during the circular cutting movement of the circular saw blades on a circular path around the axis of the drive shaft.
By arranging the guide spindles about the axis of the drive shaft and positioning them in the disc-like, axially displaceable support bodies which are rotationally secured to the drive shaft it is possible to provide a compact method of construction which with a symmetrical arrangement of the guide spindles on the smallest possible circle circumference lying concentric with the axis of the drive shaft guarantees a smoothly balanced cutting movement with the smallest possible additional mass inertia forces. During the adjustment process when the drive shaft is stationary the guide spindles which preferably have a thread, e.g. a trapezoidal thread, serve to transfer the force and motion to the relevant support bodies which are to be axially displaced.
Through such an arrangement it is ensured that the adjustment of the cutting width can be carried out, as opposed to using multi-blade saw boxes, without any time-consuming labour-intensive dismantling of the saw blades inside the machine. Rather the support bodies are designed significantly narrower compared with the displacement heads of known motorized adjustable multi-blade and circular trimming saws, so that it is possible to provide smaller minimum cutting widths and/or a larger number of circular saw blades which can be fitted.
As a rule one circular saw blade is provided for each axially displaceable support body. The invention also includes variations wherein several circular saw blades are to be fixed on one support body and which then have a fixed space from each other and can only be axially displaced together. However variations are likewise also possible wherein no circular saw blade is mounted on individual support bodies. This can then be advantageous for example when during one work process there are fewer circular saw blades required than the number of support bodies, but dismantling the excess support bodies from the cutting device would be uneconomic however.
In a preferred embodiment of the invention at least one support body is axially fixed. This support body is preferably located on the outside at the end of the guide spindles whose ends are mounted in same freely rotatable, but axially immovable. A favourable distribution of the centrifugal forces which arise during the cutting movement is thereby produced.
A circular saw blade is preferably mounted on the axially fixed support body to be used as the reference from which the further cutting widths are determined. However there are also further possible variations wherein no circular saw blade is mounted on the fixed support body so that all the saw blades are axially displaceable.
In a preferred variation of t

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