Cutting – By tool reciprocable along elongated edge – With dynamic balancing or shock absorbing means
Patent
1988-11-03
1991-05-28
Yost, Frank T.
Cutting
By tool reciprocable along elongated edge
With dynamic balancing or shock absorbing means
83571, 83750, 83780, 83783, 83785, 83816, B27B 312
Patent
active
050184202
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a machine tool comprising a hollow frame having a lateral upright, the upright linking a horizontal upper arm to a horizontal lower arm, the free ends of each of the arms being provided with fixing elements for fastening one end of a scroll saw blade and imparting to the blade a longitudinal reciprocating movement, one of the fixing elements being driven in reciprocating movement by a motor housed in the frame, the two fixing elements being linked to each other by flexible tie means, the means passing on feed pulleys and imparting the movements of the fixing element driven by the motor to the other fixing element, in order to provide the other fixing element with a force for return of the saw blade. A machine tool of this type is disclosed, for example, in U.S. Pat. No. 1,467,720.
Swiss Pat. No. 654,241, corresponding to U.S. Pat. No. 4,649,608, discloses a universal machine tool having the above-mentioned characteristics, but permitting other machining operations such as drilling, sawing with a jig-saw or with a circular saw, milling, sand papering, grinding and so on.
When the scroll saw is not in use, the fixing element for return of the saw blade occupies a position unnecessarily, which position could be better used for another purpose.
OBJECT AND SUMMARY OF THE INVENTION
The object of the present invention is to make it possible to free the position occupied by the fixing element for return of the saw blade. To this end, the machine tool according to the present invention is characterized in that the flexible tie means passes on a stretcher subjected to an elastic return action, in order to bring into a retracted position, when the saw blade is removed, the one of the two fixing elements which is not driven by the motor.
BRIEF DESCRIPTION OF THE DRAWINGS
The attached drawings show diagrammatically and by way of example an embodiment and a variant of the machine tool which is the object of the invention. However, these drawings only show the characteristics peculiar to the present invention and the reader wanting to have a complete idea of the machine is referred to the above-mentioned Swiss Patent or the corresponding U.S. patent.
FIG. 1 is a front view, partly in section, of said embodiment.
FIG. 2 shows part of the mechanism for driving the saw blade.
FIGS. 3 and 4 show, on a larger scale, a linking device to which are fastened the ends of the saw blade.
FIGS. 5 and 6 show in greater detail the parts for fixing the blade of the scroll saw.
FIG. 7 shows one variant of part of said mechanism.
FIG. 8 illustrates a second variant of the mechanism shown in FIG. 7.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The machine illustrated in FIG. 1 comprises a frame formed by an upper arm. 1, an upright 2 and a lower arm 3 on which is mounted a work plate 4, shown in phantom line. The upright 2 houses an electrical motor 5 intended for driving several tools which can be powered by said machine. For example, the machine may comprise a revolving spindle to constitute a drill, as is shown in U.S. Pat. No. 4,149,608. The spindle is not illustrated in the drawing since it is not part of the present invention. Only part of the driving device for this spindle has been sketched, i.e., a shaft 6, driven by the motor 5 via a belt 7.
The lower end of the shaft of the motor 5 carries a pulley 8 on which passes a belt 9 intended to drive the tools which can be fastened to the fixing elements on lower arm 3. The belt 9 drives a horizontal shaft 10, as shown in FIG. 2, by way of a constant-mesh gear for example, this type of gear being well-known itself and therefore not shown.
The shaft 10, seen in FIG. 2, is part of a mechanism intended to impart a reciprocating movement to a scroll saw. To this end, the shaft 10 carries an eccentric 11 on which is engaged the bearing of a connecting rod 12, the foot of this connecting rod being engaged on a lever 13 which carries a pivot 14, this pivot being engaged in a hollow 15 provided in a drive part 16. This driv
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Mefina S.A.
Smith Scott A.
Yost Frank T.
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