Machine tools abstract
A tool-holder for machine tools, in particular a punch-holder (10)
for forging machines utilised for the production of bolts and screws
and provided with an oscillating plate (18), is connected to a plate-like
support (12) by means of screws (14), and is adjustable on the same
by means of eccentrics (16); said plate-like support (12), which
bears at least a punch-holder (10), is caused to be interchangeably
integral by two or more screws (20) with the oscillating plate (18)
of said forging machine.
Machine tools claims
What is claimed is:
1. A forging machine for producing bolts and screws, said forging
a) an oscillating plate (18);
b) a plate-like support (12) removably mounted on said oscillating
plate (18) by means of at least two screws (20); and
c) a tool holder (10) connected to said plate-like support (12)
by means of a plurality of screws (14) and adjustable thereon by
means of eccentrics (16),
whereby said plate-like support with said connected tool holder
is removably integral with said oscillating plate and is adapted
to be removed therefrom and interchanged with another plate-like
support with tool holder thereon.
2. The forging machine as defined in claim 1 which further includes
at least one obligated strike and centering means (32) for coupling
said tool-holder (10) to said oscillating plate (18).
3. The forging machine as defined in claim 2 wherein said strike
and centering means (32) are formed on said plate-like support (12)
for engagement with said oscillating plate (18).
4. The forging machine as defined in claim 3 wherein said obligated
strike and centering means (32) comprises a key.
5. The forging machine as defined in claim 1 wherein said oscillating
plate (18) includes an extension (18') protruding with respect to
said plate-like support (12) adapted to strike opposing stop members
(22) during its oscillating movement.
Machine tools descriptionDESCRIPTION
The present invention relates to a tool-holder for machine-tools.
In particular, the present invention relates to a tool-holder particulary
usable in forging machines employed for the production of bolts
and screws, and suitable to constitute the support for the forging
punch or punches.
As is known, in the field of the production of screws, rivets and
the like, obtained by cold deformation of wire lengths, special
machines are used that carry out sequentially different working
operations starting from a semi-finished product, constituted by
a wire having a suitable cross-section, which unwinds from a skein.
In the forging machines of the known art, one of the basic problems
is associated with the type of product to be obtained in terms of
size, or the necessity of systematically replacing the forging members
whenever the type of artefact to be made changes. Raw screws or
rivets or like small items are in fact obtained on the forging machines
by means of special forging tools, in particular by punches caused
to be integral with a special support and to co-operate with a matrix
restraining the wire that constitutes the semi-finished product.
Therefore, whenever the product to be obtained changes, it is necessary
to replace said punches and the related support with others having
suitable shape or size, which involves difficult adjustments, with
ensuing delays in the time of preparation of the machine.
The object of this invention is to obviate the aforesaid drawback.
More particularly, the object of this invention is to provide a
tool-holder for machine tools, especially a punch-holder applicable
to forging machines employed for the production of bolts and screws,
suitable to be easily installed and replaced, with no need for complex
A further object of the invention is to provide users with a tool-holder
as defined above, such as to ensure a high level of resistance and
reliability over time, and also such as to be easily and economically
These and still other objects are achieved by the tool-holder for
tool machines of the present invention, in particular a tool-holder
for machine tools employed for the production of bolts and screws,
provided with an oscillating plate and connected to a plate-like
support by means of screws and adjustable on the same by means of
eccentrics, characterised in that said plate-like support bearing
at least a punch-holder is interchangeably integral on the oscillating
plate of the forging machine by means of two or more screws.
The construction and functional characteristics of the tool-holder
for machine tools of this invention will be better understood when
considered with the following description, wherein reference is
made to the attached drawings which represent a non limiting preferred
embodiment of the same, and wherein:
FIG. 1 is a schematic front view of the tool-holder of this invention;
FIG. 2 is a schematic longitudinal section of the same tool-holder.
With reference to the above figures, the tool-holder of this invention,
typically a punch-holder for forging machines employed for the production
of bolts and screws, is indicated as a whole by 10 and is connected
to a plate-like support 12 known in itself, by means of a couple
of screws 14' punch-holder 10 is adjustable on support 12 by means
of a system of eccentrics 16 also known.
According to the invention, the plate-like support 12 is caused
to be integral with the oscillating plate 18 forming part of the
forging machine (not shown), by means of two or more screws 20'
forms in the upper part a protruding extension 18' adapted to strike,
during its oscillatory movement, conventional stop members 22.
In the preferred embodiment of the figures, as can be especially
seen in FIG. 1 two coupled punch-holders 10 are connected to the
plate-like support 12 because of the oscillatory movement of plate
18 which leads alternatively either of said punches to operate on
the wire to realise the small items, namely screws, rivets and the
like. Said wire, which unwinds from a corresponding skein, is fed
near the punch-holders 10 by special devices, not included in the
invention, comprising extraction pins 24 24' with the related springs
26 and subjected to working starting from the ram, indicated by
28 of the forging machine, co-operating with a tang 30 integral
with the oscillating plate 18. The plate-like support 12 is advantageously
coupled to the latter in a precise and unequivocal manner, through
reference and strike means 32 constituted by one or more keys or
If the working should be changed, changing therefore also the forging
punches, it suffices to replace the plate-like support 12 bearing
the punch-holders 10 with another similar support already assembled
and provided with suitable seats for housing and restraining differently
shaped and/or sized punches, to be used in the case in point. The
changing operation is particularly quick and easy for the operator,
since it is only necessary to remove plate-like support 12 by loosening
and unthreading screws 20 and the installing of another complementary
support by the same attachment means. As the replacement of said
support 12 does not cause any changes in the operating whole of
the forging machine, since it does not affect the working of the
same, re-tooling times are markedly reduced, especially considering
that the punch or punches are substantially separate or external
relative to the operating whole of the machine and therefore the
supplementary adjustment or regulation of other devices are not
As can be understood from the above, the advantages of the invention
The tool-holder of the present invention allows to markedly reduce
the machine-tooling time and excludes the need of adjustment operations
on the tools or devices whose working is related to the same.
The invention, as described hereabove and claimed hereafter, has
been proposed by way of non limiting and non critical example, the
same being susceptible of changes and variants, which fall anyhow
within the scope of the novel concept.