Wireworking – Crimping
Patent
1986-10-20
1988-01-12
Larson, Lowell A.
Wireworking
Crimping
B21F 100
Patent
active
047184612
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention falls within the vast technical field concerning the automatic assembly of electrical and/or electronic components in a printed circuit; for this operation, the leads of each component must be parallel to each other so that it is possible, and also easier, to insert the leads into their respective holes in the printed circuit.
This may be achieved using two different configurations; in the first configuration, both leads are bent perpendicularly with respect to the body of the component, and in the second configuration only one lead is bent.
It is known that the above-mentioned components (e.g. transistors, diodes, capacitors, resistors, etc.) are supplied either with the leads already in one of the above configurations (with the ends of the leads hooked onto a mounting strip or bar), or in the axial configuration, i.e. with the leads co-axial to the body of the relevant component. In the latter case, two bars are supplied, to which the opposite ends of the leads are hooked.
In the case where the components are supplied with the leads in an axial configuration, the leads must be worked (normally by bending) into one of the two configurations mentioned above, with a pre-established distance (pitch) between the leads thus orientated.
The particular technical sector embracing this invention concerns the technical problem put forward above, i.e. the bending of leads in an axial configuration in which the leads are orientated in the same direction and in accordance with pre-established pitches.
BACKGROUND ART
One such device consists of two paralle plates comprising two grooves, one on each plate and one opposite the other.
A component, whose leads must be positioned to line up with the said grooves, is placed on the ends--which are facing the same way--of the plates.
By making the component body slide inside the plates (e.g. by means of a pressure device), the leads are made to press against the plates; this causes the leads to bend in the same direction and to slide in their respective grooves; in the configuration thus obtained, the pitch of the leads is equal to the distance between the grooves.
This is certainly not an ideal solution as regards `centering` the component body in relation to the leads made parallel by the above-mentioned method.
In another known type of the said devices, the action of the pressure device is assisted by two tappet members in contact with the ends of the component body and moving in synchrony with the pressure device; in this technical solution, the component body is `centred` with respect to the leads, and at the same time the leads are bent and perfectly parallel.
Both of the above-mentioned devices have constant pitch, which undoubtedly causes difficulties for the following reasons.
To illustrate the above, it should be remembered that the pairs of bars between which the components--with the co-axially-situated leads--are integrally interposed, are arranged to lie parallel and must be capable of being reeled for transport. In order to bend the leads to the desired configuration the components must be detached from the bars and supplied by a suitable loader, for the above-mentioned reasons to a corresponding bending device designed to achieve the desired lead spacing; the constructional difficulties, space requirements and capital and maintenance costs are evident. In particular, if different pitches are required for the same component, there must be as many loaders as desired pitches, each loader being associated with a corresponding bending device. This is certainly not ideal in terms of space utilization since, as is known, the frequency of use of components which are the same but with different pitches is irregular, whereas it is naturally necessary for a `loader` whose pitch has the minimum frequency of use, to be connected to the device. In the case of components with bodies of different sizes but with the same pitch, it is necessary to use as many devices for `centering` as mentioned above, the body with respect to the leads orientat
REFERENCES:
patent: 4361025 (1982-11-01), Foster et al.
patent: 4462435 (1984-07-01), Whitley
patent: 4515001 (1985-05-01), Zahn
patent: 4610279 (1986-09-01), Stewart
Arcotronics Italia S.p.A.
Larson Lowell A.
Smith Spencer T.
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