Engraving head support method with linear head driver

Details Engraving head support method with linear head driver Engraving head support method with linear head driver

1998-04-02

2001-08-07

Tsai, Henry (Department: 3722)

Turning

Process of turning

C082S011100, C082S047000, C082S154000

Reexamination Certificate

active

06269718

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to electronic engraving devices for engraving ink-receiving cavities into the surface of a gravure printing cylinder. Such engraving devices commonly comprise an engraving head which includes a diamond stylus and a guide shoe. The guide shoe bears against the printing cylinder and provides a reference surface for the engraving process. An electromagnetic driver is mounted within the engraving head for oscillating the stylus into engraving contact with the printing cylinder. Meanwhile the printing cylinder rotates about its cylindrical axis. The engraving head is supported such that it moves parallel to the axis of the printing cylinder in synchronism with printing cylinder rotation. A typical prior art device is shown in Buechler U.S. Pat. No. 4,450,486.
A prior art device of the type disclosed in the Buechler patent supports the engraving head in a manner generally as illustrated in
FIG. 1
hereof. Thus an engraving head
12
supports a guide shoe
13
against a print cylinder
10
which is rotating in the direction indicated by the arrow
11
. Engraving head
12
rests upon a deck
16
which in turn is supported by a base
20
. Base
20
is horizontally moveable as indicated by the arrow
15
, while deck
16
is rotatable about an axis
18
. Rotation of deck
16
about axis
18
produces rotational movement of engraving head
12
as indicated by the arrow
93
. A diamond engraving stylus (not illustrated in
FIG. 1
) is mounted alongside guide shoe
13
and is brought into engraving contact against cylinder
10
by a combination of translational motion and rotary motion. During setup the rotational position angle of engraving head
12
is adjusted so as to align the guide shoe and engraving stylus to the cylinder surface and produce a desired printing cell depth for a predetermined stylus driving signal. Unfortunately the rotation of engraving head
12
changes the orientation of the stylus as well as its cutting depth. This produces unwanted engraving errors.
It is therefore seen that there is a need for engraving head support means capable of positioning a stylus against a printing cylinder by translational motion only.
SUMMARY OF THE INVENTION
In an engraving apparatus according to the present invention an engraving head translates a stylus, without rotation, into engraving contact with a rotating printing cylinder. The engraving head is mounted on a platform comprising a deck and a base joined by connection means which permit the deck to move relative to the base only by translation within a plane perpendicular to the axis of the printing cylinder. In one embodiment the connection means comprise a pair of parallel support columns. The support columns may be deflected in parallel fashion to enable movement of the deck relative to the base. However, the deck remains parallel to the base at all times. The engraving head rests on the deck and cannot rotate relative to the printing cylinder.
Preferably the support columns are secured fast to the deck and the base and accommodate translation of the deck by parallel flexing. The flexing occurs within a plane perpendicular to the axis of rotation of the printing cylinder, and a parallel relation between the deck and the base is maintained. The platform is so constructed as to prevent relative movement between the deck and the base in a direction parallel to the axis of the printing cylinder.
In alternate embodiments the connection means comprise a carriage driven by a motor and a leadscrew which are mounted in the base. A resilient link arrangement couples the carriage to the deck.


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