Elongated-member-driving apparatus – With control means responsive to sensed condition – Work-responsive
Patent
1989-10-25
1991-05-07
Eley, Timothy V.
Elongated-member-driving apparatus
With control means responsive to sensed condition
Work-responsive
227 78, 307 41, 361167, 361190, B25C 717
Patent
active
050129678
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electric tool for driving in fixing elements, such as staples and nails, into an object by means of a magnetic field generated by supplying magnetising current to an electromagnetic device, said tool having a circuit means which is adapted, when activated, to supply magnetising current to said electromagnetic device.
In a prior art staple tacker of this type to be connected to mains voltage, an actuator is used which, when actuated, activates said circuit means to supply a magnetising current pulse to said electromagnetic device. To operate the actuator, an electric signal is supplied to the input thereof. The electric signal is generated when an object, such as a sheaf of papers to be stapled, has been inserted in the staple tacker and comes into engagement with an activating means.
Frequently, several such staple tackers are used together, for example when a number of papers in a sheaf are to be stapled together at various points. If the stapling points are in alignment with each other, the staple tackers are arranged beside one another, their activating means being aligned for simultaneous actuation when the sheaf of papers has been inserted in the staple tackers. The circuit means of the staple tackers are all activated at the same time to supply a magnetising current pulse to each electromagnetic device, which results in a high line load. If the stapling points are not aligned but are distributed in such manner that the staple tackers cannot be arranged for simultaneous actuation of their activating means, effective stapling requires actuation of the activating means of one staple tacker to actuate, in its turn, the activating means of the other staple tackers.
SUMMARY OF THE INVENTION
A special object of the present invention is, therefore, to provide a staple tacker which is readily connectible with other similar staple tackers for delayed actuation of the circuit means of the staple tackers, the connection being such that the staple tackers are independent of which mains voltage phase is connected to the respective staple tacker.
A more general object of the present invention is to provide an electric driving tool which can be connected with other similar tools in the manner stated above.
This general object is achieved by means of an electric tool which is of the type mentioned by way of introduction and which is characterised by two actuators alternatively connectible to the circuit means and adapted, when actuated, to activate said circuit means, one of said actuators being an actuator which is activatable in a potential-free mode and which is, in an initial position, unconnected to said circuit means, and the other of said actuators being connected to said circuit means in the initial position; and an activating means connectible to the actuator which is activatable in a potential-free mode and included in an optionally subsequent, similar tool, said activating means being adapted to be actuated by said circuit means to produce, with a time delay after the actuation of said circuit means, a potential-free signal for actuation of said actuator which is activatable in a potential-free mode and included in the optionally subsequent tool, said actuator which is activatable in a potential-free mode, being activatable by an activating means connected thereto, such as the activating means of the optionally preceding, similar tool so as to activate said circuit means after connection thereto.
In a preferred embodiment, the actuator which is activatable in a potential-free mode, is activatable by application of a light signal, such as an IR light signal, and the activating means is adapted to produce a light signal, such as an IR light signal.
In another preferred embodiment, the actuator which is activatable in a potential-free mode, is adapted, on connection of an activating means thereto, to be connected to said circuit means.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in greater detail below with refere
REFERENCES:
patent: 3866051 (1975-02-01), Shearer et al.
patent: 4579029 (1986-04-01), Sunaga
patent: 4589581 (1986-05-01), Balma
patent: 4750661 (1988-06-01), Pane
Eley Timothy V.
Isaberg AB
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