Printing – Rolling contact machines – Rotary
Reexamination Certificate
1999-11-04
2001-03-13
Yan, Ren (Department: 2854)
Printing
Rolling contact machines
Rotary
C101S216000
Reexamination Certificate
active
06199481
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a sheet-fed printing press, or more precisely, to a power feeder apparatus for a rotary shaft such as a plate cylinder shaft of the printing press.
2. Description of the Prior Art
In order to correct the position of a printing plate and thus to effect register adjustment by electric driving means such as a motor incorporated in a plate cylinder, it is necessary to supply power at will from a still machine side to a plate cylinder shaft which is rotating at high speed. The term “power” used herein includes a relatively large current for driving the motor as well as a relatively small control current for controlling a potentiometer fitted to the motor.
In German patent laid-open DE 4140013 by the same applicant as in the present application, a power feeder apparatus for a rotary shaft is disclosed which comprises, as shown in
FIG. 5
, a rotary cylinder
104
with many slip rings
100
formed on the outer periphery thereof for electrically connecting with the rotary shaft
102
; a fixed casing
106
so disposed as to surround the rotary cylinder
104
; and a large number of canti-lever brushes
108
extruded from the fixed casing
106
for controllably bringing into contact with the slip rings
100
.
However, such brush ring type apparatus is high in cost, because forming the slip rings on the periphery of the rotary cylinder is difficult. The rotary cylinder is somewhat long enough in the axial direction of the rotary shaft and occupies a large space. In addition, there arise sometimes errors in signal transmission due to the weak spring force of the cantilever brushes.
SUMMARY OF THE INVENTION
In view of the above-described problems of the prior art technique, the present invention provides an improved power feeder apparatus for a rotary shaft and aims at reducing the cost of production, and providing a compact apparatus, while furthermore, securing a stable electrical contact.
In accordance with the present invention, the power feeder apparatus comprises a circuit substrate with cocentric circular circuits whose centers coincide with an axis of the rotary shaft and provided at a tip end of the shaft
10
; a support substrate
42
with elastic contacts
42
in correspondence with the circular circuits and slidably provided at the stationary side of the apparatus in opposition to the circuit substrate
22
; and actuator means
50
for moving the support substrate
22
in the direction of the circuit substrate
22
.
Only when power feeding is needed, actuator means moves the support substrate towards the circuit substrate. Then, a plurality of elastic contacts provided on the support substrate come into contact with the corresponding cocentric circular circuits of the circuit substrate.
Electric connection can be obtained, regardless of the rotational phase of rotary shaft
10
, as the center of the circuits coincides with the axis of the rotary shaft.
These and other objects of the invention will become apparent from the following description with reference to the drawings. But, these show merely an embodiment of the invention.
REFERENCES:
patent: 5249522 (1993-10-01), Kusch et al.
patent: 5357860 (1994-10-01), Shibata et al.
patent: 5410959 (1995-05-01), Sugiyama et al.
patent: 5720222 (1998-02-01), Reichardt et al.
patent: 5771805 (1998-06-01), Branas et al.
patent: 5924362 (1999-07-01), Volz et al.
patent: 4140013 (1993-06-01), None
Ladas and Parry
Shinohara Machinery Co., Ltd.
Yan Ren
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