Woodworking – Veneer lathe
Patent
1990-10-31
1991-11-26
Bray, W. Donald
Woodworking
Veneer lathe
82 17, 82148, 91 32, 91420, 144209A, B27L 502
Patent
active
050675346
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a spindle drive for a veneer lathe.
In order to drive the spindle of a veneer lathe, usually an electric motor is used which transfers the rotating power to the spindles through a reduction gear and a chain transmission. It is also common practice to employ only one power source per lathe, fitted at the proximity of one end of the lathe. The rotating power is transferred to the other spindle through a transmission shaft, a chain drive and/or a set of cogwheels.
It is a direct consequence of the above-described construction used that the overall construction is massive, both in terms of the static components used in the apparatus as well as the revolving components used therein. Also, the construction is strictly bound to predetermined operational dimensions that have been chosen, wherein adaptation to different log lengths is possible only within the scope of the ordinary axial movement of the spindles, i.e. the spindle stroke.
However, in practice, the nominal dimensions of the logs to be turned vary starting from a log length of 950 mm, whereas a usual upper limit of a log length is 2750 mm. Log lengths higher than 3000 mm also occur. Within the scope of the spindle stroke, the lathe can, however, be adapted within considerably narrower limits, whereby, in the dimensioning of the lathe, the nominal dimension of the log to be turned must be taken into account. This circumstance can be considered to be quite a restrictive factor.
The primary object of the present invention is to simplify the rotation drive equipment of the spindles and to make them such that they require less maintenance, respond to operation commands more rapidly (i.e. enable smaller mobile masses). and are less noisy in operation. At the same time the construction of the whole lathe becomes simpler, and possibilities are obtained for the use of modular constructions.
In this way, possibilities are also obtained for adaptation of the veneer lathe to a larger variation in the log length than what is possible within the scope of the grasping stroke of the spindles, i.e. the so-called spindle stroke.
Further, displacement of the spindles in a plane perpendicular to the spindle axis is permitted, which enables the possibility of providing the lathe with several operational applications, such as, for example, the possibility to operate with two different knife settings.
The main object can be achieved in accordance with the invention by means of a lathe which comprises spindles or spindle pairs directed one opposite the other and receiving power of rotation at each end of the lathe, wherein the spindles or spindle pairs can be displaced within the scope of the spindle stroke axially in opposite directions in relation to one another so as to grasp the log to be turned, according to the primary characteristic of the invention, so that the spindles or spindle pairs are provided with drive motors of their own at each end of the lathe to produce the power of rotation.
The other characteristics of the invention are apparent from the accompanying patent claims.
The invention will be described with the aid of the accompanying drawing illustration, wherein the log rotating spindles and their drives are shown in a reduced scale.
In the embodiment shown, the spindles consist, in the conventional way, of two spindle pairs 1,2 and 1',2', each pair comprising spindles of different diameters which can be displaced in relation to one another telescopically in a manner known in prior art. Each of the spindles is mounted on an end frame 6,6' of its own. In the embodiment shown, the electric motors that operate the spindles are mounted so that the rotor of the motor is mounted directly on the spindle shaft 4,4', and the stator is mounted on the end frame 6,6'. Thus, in this embodiment, the spindles, the drive motor and the end frame can be formed as a whole unit.
In the simplest embodiment, such a unit can be mounted in a lathe on guides parallel to the spindle axes to operate jointly with an opposite, stationary spindle arrangement, which
REFERENCES:
patent: 1841544 (1932-01-01), Merritt
patent: 2340532 (1944-02-01), Jackson
patent: 2501387 (1950-03-01), Haumann
patent: 4378827 (1983-04-01), Shrum et al.
Bray W. Donald
Raute Oy
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