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Патент USA US2117149

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May 10, 193s.
J. M. cLEvENGl-:R
2,117,149
PACKING STABBER
Filed March 1' 195,7
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38
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HIS
ATTORNEYS
2,117,149
Patented May 10, 1938
UNITED STATES PATENT OFFICE
l2,117,149
PACKING STABBER.
p
Jerry M. Clevenger,‘Maywood, Ill.
Application March 1, 1937, Serial No. 128,545
5 Claims. (Cl. 164-119)
My invention relates to printers’ tools, and has hand, thereby rendering the tool applicable to
among its objects and advantages the provision locations to be stabbed which are not readily ac
of an improved packing stabber.
In the printing art it is customary for the press
5 man to print an impression on a sheet to deter
packing over which the sheet upon which the test
cessible and in Which the stabber is so con
structed as to eliminate the necessity for an ad
ditional tool, such as a hammer, for striking pur- 5
poses.
A further object is to provide a packing stab
ber in which the piercing element is in the na
ture of a tubular cutter including means which
10 impression is to be made is- stretched. The
printing is done by revolving the cylinder in syn
chronized relation with the reciprocating bed
is automatic in operation for ejecting paper disks 10
which might lodge Within the tool.V
In the accompanying drawing:
mine Whether all printing parts of the bed plate
have proper pressure relation with the cylinder.
It is common practice to provide the cylinder with
`
plate.
After the test sheet is printed, the sheet is ex
15 amined to determine Whether the impressions
thereon are uniformly perfect. In the event of
defective impressions, a packing stabber is em
ployed for making marks in the test sheet, which
p marks are imbedded in the packing on the cylin
der. After the sheet is marked, it is removed from
the cylinder and the light spots backed up by at
taching pieces of paper Where needed. If the im
pressions are printed heavily, parts of the sheet
Y may be cut out.
25
In the trade this test sheet is usually called a
“spot sheet”. After the spot sheet has been cor
rected, it is replaced on the cylinder underneath
an unprinted sheet which Was originally posi
tioned underneath the spot sheet and carries
30 stabber marks corresponding to the marks in the
spot sheet. It is absolutely necessary that the
spot sheet occupy its original position on the
surface of the cylinder, which position may be
easily determined by aid of the stabber marks
35 which are of sufficient depth to penetrate a con
siderable depth into the packing on the cylinder.
In using a packing stabber it is necessary to limit
the depth of the stabber marks to prevent com
plete penetration of the packing and consequent
40*Y damage to the cylinder.
An object of my invention is to provide a pack
ing stabber Which may be adjusted for stabbing
the packing to any required depth Without the
danger of stabbing through the packing and in
45 to the cylinder.
A further object is to provide a packing stab
ber in which the stabbing forces may be so con
trolled as to provide uniform stabbing depth and
in which the depth does not depend upon the
50 judgment of the user of the tool, but is deter
mined by mechanical means which operate with
such a degree of uniformity as to absolutely pre
vent damage to the cylinder.
Another object of the invention is to provide a
55 packing stabber which may be operated with one
Fig. 1 is an elevational view of a packing stab
ber according to the invention ;`
Fig. 2 is a sectional view along the line 2-2 of 15
Fig. 1;
Fig. 3 is an enlarged sectional detail view show
ing the manner in which the cylinder packing is
stabbed;
n Fig. 4 is a view taken from the position indi- 20
cated by line 4-4 of Fig. l; and
Fig. 5 is a sectional view along the line 5-5 of
Fig. 3.
In the embodiment selected to illustrate my in
vention, I make use of a tubular body I0 within
which I slidably mount an impact head I2 which
is urged against a stop member I4 by a spring I6.
One end of the spring is arranged in abutting re
lation with the plug I8 having threaded relation
at 2U with the body I0. The opposite end of the 30
spring has i pressure relation With the impact
head I2 and encircles an extension 22 carried by
the head.
-
In Figs. 2 and 3, I illustrate the stop I4 as hav
ing threaded relation at 24 with the body Iû and 35
as being provided with a central opening 28 for
accommodating the tubular marking element 28
formed integrally with the impact head I2. I
sharpen the cutter 28 at 30 to facilitate pene
tration of the packing 32 upon the printing cylinder 34. I slot the body Ill at 36 to accommo
date a pin 38 connected with the impact head I2
for retracting the same against the tension of
the spring I6. Slot 36 communicates with an
offset slot 40 which receives the pin 38 in the
retracted position of the impact head I2 for re
taining the head in its retracted position.
In Fig. 3, I illustrate the extension 22 as hav
ing threaded relation at 42 with the impact head
I2. A threaded opening 44 is provided in the extension 22 for the reception of the threaded end
46 of the pin 38. The pin extends through an
opening 48 in the impact head I2. Within the
bore 50 in the impact head I2 I position a head
52 carried by a plunger 54 slidably mounted
40
45
50
55
2
2,117,149
within the tubular cutter 28. A spring 56 is in
terposed between the extension 22 and the head
52 for urging the plunger 54 to the position of Fig..
2, at which time it projects beyond the cutting
edge 38 for ejecting paper disks which might
lodge within the tubular cutter.
In operation, the impact head I2 is retracted
and latched in its retracted position by rotating
the head slightly within the body I0 for posi
10 tioning the pin 38 within the offset slot 40. The
end of the stabber is then positioned against the
spot sheet 58 which may lie over one or two addi
tional sheets Bû which are stretched over the
packing 32 carried by the cylinder 34. With the
stabber properly positioned, the pin 38 is moved
for bringing it out of holding relation with the
slot 43, at which time the spring I6 propels the
impact head I2 in the direction of the stop I4.
The penetrating depth of the cutter 28 is deter
mined by the position of the stop I4. Normally
the cutter 28 passes through the spot sheet 58,
the sheet 60 which may lay underneath the spot
sheet and partly through the packing 32.
I am aware that marking devices have been
25 employed wherein a hammer is employed for driv
v ing the marking into the cylinder packing. With
such tools it is possible to penetrate a suñî'cient
depth, but in many cases the blows are struck
with excessive force, which drives the piercing
30 element through the packing and into the cylin
der, thereby damaging the latter. Even though
the piercing element may be associated with a
stop, excessive forces sink the tool bodily into the
packing, thereby causing damage to the cylin
35 der. It is, therefore, essential that the stabber
be so designed as to prevent excessive pene
tration.
My stabber embodies a piercing element in
which the piercing forces are determined by the
40 spring I6 so that the penetrating forces are of a
. uniform nature, thereby preventing the tool from
damaging the cylinder. The depth of penetra
tion is easily adjusted through the medium of
the stop I4 while the spring I6 drives the impact
45 head I2 in its piercing direction with the same
forces at all times.
Another important feature resides in the pro
vision of a stabber in which the tool may be sup
ported in one hand and the impact head re
leased by a finger of the hand supporting the
50
tool. In this way I attain accessibility to situa
tions in which it is diflicult and many times im
possible to support the tool with one hand and
drive the piercing element home with an addition
tool,
such as a hammer. Should paper disks
55
lodge in the cutter 28, the disks are rejected when
the tool is lifted from the cylinder. The tension
of the spring 56 is suiîicient to eject the paper
disks but is such as to permit the plunger 54 to
move inwardly of the cutter 28 when the end of
the stabber is placed adjacent the work to be
marked.
Without further elaboration, the foregoing will
so fully explain my invention that others may,
by applying current knowledge, readily adapt the
same for use under various conditions of service.
I claim:
l. A packing stabber comprising a guide, a tu
bular cutter of the impact type, resilient means
cooperable on the guide and said cutter for pro
pelling the same, and means operating within
the tubular cutter for ejecting material lodging 10
therein.
2. A packing stabber comprising a guide, a
tubular cutter of the impact type, resilient means
cooperable on the guide and said cutter for pro
pelling the same, and means operating within
the tubular cutter for ejecting material lodging
therein, said last named means comprising a
spring pressed plunger.
3. A marking tool comprising a tubular body
having a slot, a marking element of the impact
type loosely positioned Within the tubular body,
a stop positioned inside the tubular body for
limiting the eiîectve impact of the marker, spring
means positioned within the tubular body and co
operating with the marker for propelling the
same, manually actuated means connected with
the marker and extendng through said slot for
retracting the marker against the tension of said
spring.
4. A marking tool comprising a tubular body
having a slot, a marking element of the impact
type loosely positioned within the tubular body,
a stop positioned inside the tubular body for lim
iting the effective impact of the marker, spring
means positioned within the tubular body and
cooperating with the marker for propelling the
same, manually actuated means connected With
the marker and extending through said slot for
retracting the marker against the tension of said
spring, said slot being provided with an oiîset 40
slot for receiving said manually actuated means
for holding the marker in its retracted position.
5. A marking tool comprising a tubular body
having a slot,~a marking element of the impact
type loosely positioned wthin the ltubular body,
a stop positioned inside the tubular body for lim 4,5
iting the effective impact of the marker, spring
means positioned within the tubular body and co
operating with the marker for propelling the
same, manually actuated means connected with
the marker and extending through said slot for
retracting the marker against the tension of said
spring, said slot being provided with an offset
slot for receiving said manually actuated means
for holding the marker in its retracted position,
said marker comprising a tubular element hav
ing a cutting edge, and resilient means operating
within the tubular element for rejecting material
lodging therein.
JERRY M. CLEV'ENGER.
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