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Патент USA US2106953

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Feb. 1, 1938.
,Y
R LUDE‘MG
2,106,953
CROSS FOLDING MACHINE
Filed Sept. 25, 1955
v 3 _Sheets-Sheet l
Feb. 1, 1938. '
1:;` LUDEWIG
2,106,953
cRoss FOLDING MACHINE
Filed Sept. 25, 1935
»
3 Sheets-Sheet 2
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Unvenfor
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H'H'orney
FE1». 1, 1938.
R. I_UDEWIG
2,106,953
CROSS FOLDING MACHINE
Filed sepfß. 25, 1935 '
1
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Patented Feb. 1, 1938
2,106,953 «
UNITED s'rA'res'rA'reNT OFFICE
>2,106,953
CROSS FOLDING MACHINE
Richard Ludewig, Leipzig, Germany
Application September 25, 1935, Serial No. 421,077
In Germany September 25, 1934
10 Claims.
The invention relates to a cross folding ma
chine having a blade folding mechanism for the
cross fold succeeding a buckling folding mecha
nism, and consists therein that the stroke of the
5 blade is caused directly, or for example through
an automatically _disengaging coupling, independ
ently of a deñnite working tempo by the sheet
y conveyed up tothe front stops of the cross fold
ing mechanism by the closing of the control open
10 ing of a suction conduit in which a suction piston
(snifting piston) connected with the folding blade
is displaceably arranged. This pneumatic control
of the stroke of the blade renders possible, in con
sequence of its independence of a fixed working
l5 tempo and of the lifting eccentrics of a control
shaft, the adaptation of the capacity of the blade
folding mechanism to the higher capacity of the
buckling folding mechanism, whilst retaining the
advantages of the blade fold as compared with
,o the buckling fold, particularly with thick sheet
layers, namely of exact fold and of exact regis
tration. Moreover the pneumatic control has the
advantage that the source of power necessary
therefor is at its disposal in the air pump of the
g5 sheet feeding device, which air pump is existent
in any case.
The drawings illustrate a constructional exam
ple of the invention.
Figs. land 2 show in diagrammatic represen
30 tation an elevation and a plan.
Figs. 3 and 4 illustrate respectively a longi
tudinal section or cross section of the testing
device.
.
,
Figs. 5J? inclusive illustrate respectively an ele-35 vation, a longitudinal section and a cross section
of a control slide member.
Fig. 8 illustrates a modified construction of the
testing opening.
(o1. 27o-62)
tionary snifting cylinder I4- so as to be verti
cally displaceable. Folding blade, piston rod and
piston are held by means of a spring I 5 in a posi
tion of readiness.
The cylinder space' located beneath the piston
is connected by means of a conduit I6 with an air
pump I1. A rotary slide valve I8 is arranged in
this conduit which, in one position, shuts oiï the
conduit I6 from the outer air and in the other
position connects the conduit I6 with the outer
air.
The rotary slide valve I8 is mounted on a
tubular conduit part I9 in the wall of which a
numberof slits ZI) are arranged with which in
the open position of the slide valve I8 similar
'slits 2I of the latter come into register, so that 15
the free air can pass Without hindrance into the
suction conduit. In this position of the slide
valve the shifting piston I3 remains uninñuenced
by the suction conduit of the pump.
The rotary slide valve I8 is provided with a 20
short arm 22 which is pivotally connected with
a piston rod 23 of a shifting piston 25 displace
able in a stationary'cylinder 24. A spring 26
which is mounted on the piston rod 23 maintains
the the rotary slide valve in the open position and 25
thus keeps the piston 25 in the “ready” position.
The space in the cylinder 24 on the working face
of the piston 25, is likewise connected with the
suction side of the air pump I ’I by means of a
conduit 21.
30
The conduit 21 is connected With the outer air
by means of a testing opening 28 in a conduit
member which is arranged closely in front of a
front stop 9. In the constructional example il
lustrated in Fig. 3, said conduit comprises a
rotating suction conveying wheel, the holes 28 of
which coming one after lthe other into the apex
position place the conduit 21 with short interrup
tions in connection with the free air. The suc
tion conveying Wheel consists of the two hub 40
parts 29, 30 which arev rotatably arranged on a
opening; and
Fig. 10 is a similar view showing an adjustable' `pipe 21a insertedr in the conduit 21 and serving
Fig. 9 is- a diagrammatic plan view similar to
40 Fig.` 1 but showing an adjustable suction testing
suction testing opening of the modification of
Fig. 8.
45
'
v
The sheet is led up over a feed table I and
as an axle, and a cover 3I connecting said hubs
and having openings 28 therein. 'I‘he one hub
29 of the suction conveying wheel is provided 45
with a sprocket gear 32 which is connected by
arrives, after running through a buckling folder
means of a driving chain 33 with a chain wheel
consisting of the buckling rollers 2, 3, the driv
ing roller 4 and the buckling guide 5, and also 35 mounted on the driving shaft 34 of the bands.
a parallel folding mechanism with the folding The cover 3l of the conveying wheel has an air
50 rollers 3, 6 and the buckling guide 1, on convey _tight .engagement with a disc 36 iixedly mounted 50
ing bands 8 which lead it to the front stops 9 of on the conduit pipe 21a1within said wheel, which
the cross folding mechanism consisting of the disc normally covers all of the holes 28- of the
folding rollers I0 and the folding blade II. The cover except the top‘hole. .The tophole is in _
folding blade II is connected with a piston rod I2 connection, by means of a recess 31 of the disc 36,
with the hollow center space of the suction con
55 _of a snifting piston I3, which is guided in a sta
2,106,958
veying Wheel and also by means of radial bores 38
in the wall of the pipe 21a, with the inner space
of the conduit Z'I.
The sheet after passing throughthe buckling
folding mechanism is led by the conveying bands
8 to the front stops 9 of the cross folding mecha
nism. This position is shown by the broken lines
in Fig. 2.k _When it is in this position the sheet
breadth of the sheet. In certain circumstances
closes thevv testing opening 28 'at "the .top‘ of `thel
support-- |’00-is ‘carried byjthe frame of the ma
suction conveying wheel 3|, whereby the suction
action produced by the pump I1 in the pipe
system 21, 2'In is slightly strengthened, This
chine in any‘suitable manner. lThe. support |00
is slotted as at |0I, said slot extending longitudi
strengthening of the suction action suilicesvto
cause a displacement of the piston 25 in the
it may also be advisable to vary the distance oi'
the testing opening 28 from the front stops 8
with regard to the different nature of the paper, v
for example by an adjustable arrangement of the
front stops.
`
Means for accomplishing the above. noted ad
justments are shown in Figs. 9 and 10 where a
nally of the frame.
A collar |02 is slidably
mounted on said support and is capable of being
adjustably -positioned therein by a nut |03. The
15 cylinder 24, by means of which the rotary 'slide . collarcarries a transverse collar |04 in which a
valve I8 is turned so far that the slit opening _ transversely extending rod |06 is slidable. Ad
20 of the conduit part I9 in the suction pipe |76 f justment of the rod |06 is accomplished by the
‘ . leading to the suction cylinder I4 is closed.
Now,
the Whole suction action of the pump comes into
20 operation and causes a displacement of the pis
wing nut |05.v In Fig. 9, a collar |01 at one end
of the rod |06 encircles a pipe 21h.
lIn Fig. l0, a connection |08 connects the pipe _
ton I3 which results in the stroke of the folding
21b with the rod |06. It is readily apparent that
blade
the above described structure provides means for'
II.
.
‘
'
Inasmuch as the suction action at the testingopening 28 is very small, it does not hinder the
adjusting the testing openings 28 and 28‘ «both
longitudinally and transversely of the frameof
‘
25 drawing off of the sheet by the folding roller I0, . the machine.
.25
and inasmuch as the control opening is arranged
`It is further not absolutely necessary to ar
close to the side edge of the sheet, the testing range the testing opening in a suction conveying
opening I8 is re-opened immediately after the
stroke of the folding blade. On cessation of the
30 suction action in the cylindery 24 the piston 25 is
returned to its normal position under the in
fluence of the spring' 26. Simultaneously the
rotary slide valve I8 is returned to the original
position in which the interior of the conduit I6
has an open connection with the air, through the
medium of the slits 20, 2|.
`
Consequently, the suction action in the suction
cylinder I 4 is also eliminated _and the piston I3
together with the piston rod I2 and the folding
40 blade II are carried back by the spring I3 into
the position of readiness.
»_
The folding process may take placein such
manner that the folding blade does not strike so
far in between the folding rollers that the sheets
45 are drawn in by the pinchingaction alone of the
folding rollers, but only Dresses the sheets in toV
an extent such as is necessary in order that `the
sheets may be sucked up and drawn in by a fold
ing roller constructed in known manner vas a
50 suction roller. This constructional possibility is
indicated inFigs. 1 and 2. The one roller `I0 is
constructed in a manner known per se as a suc
tion conveying roller, the stationary >core of
which is connected by means of a conduit 38 with
55 the air pump. The folding blade II is provided'
on the side directed towards this folding roller>
with pressing rollers 40, which vupon the descent
of the` folding blade press the sheet on to the
folding roller constructed as asuction feed roll
60 er, so that it is tightly sucked in on to the roller
and is drawn in by the latter.
Naturally the suction roller folding mechanism
might be provided with any disposition and ar
rangement already known in a. folding mechanism
65 of this kind. In'particular also the pressing roll
ers 40 may be arranged on both sides of the fold
ing blade-.and the other roller may likewise be
constructed as a suction folding roller.
It is likewise obvious that in the different suc
70 tion pipe systemsjall the known devices for the
wheel according to the peripheral velocity of the
sheet, but in many cases a stationary testing
opening such as is shown in Fig'. 8 will suffice and 30
will permit, with 'the small strength of the suc
tion action, of a reliable conveyance ofthe sheets
to the front stops.
I claimt
1. In a. sheet folding machine, a pairiof folding 35
rollers, means for feeding a, sheet in the zone of
action of said rollers, a stop for limiting the
movementl of said sheet, a vertically movable
blade for creasing said sheet between said rollers,
a suction actuated piston rigidly connected to said 40
blade' and adapted to move the saine to crease
said sheet, a suction line connected to the cylin
der of said piston, a portion of said line being
formed to provide an opening therein, and said
opening vbeing adapted to be overlaid by an edge 45
portion of saidrsheet whereby to seal said open
ing and increase the suction in said line enough
to actuate said piston.
-
2. In a sheet folding machine, a pair of fold
ing rollers, means for feeding a sheet into 4the 50
zone of action of said rollers, a vertically movable
blade for lcreasing said sheet between said rollers,
a suction actuated piston for actuating said blade,
a normally open suction circuit leading from a.
suction creating‘source to said piston, said cir
.cuit being formed to provide an opening therein
at a point flush with the plane of and within the
limits of travel of said sheet so as to be adapted
to be overlaid by a portion of said sheet at a pre
determined point in the travel thereof to close 60
said suction circuit and actuate saidv piston.
'3. In a sheet folding machine including sheet
advancing means, folding rollers. suction oper
ated sheet creasing means and a normally open
suction circuit for actuating said means, said
circuit being formed to provide an opening in the
plane of and within the limits of the path of 'ad
vance of the sheets and adapted to be overlaid by
each of said sheets at a predetermined point in
said advance to close said circuit and actuate
regulation of the suction action may be employed.
said creasing means.
'f The suction testing openings 28 and 28“, as
4. In a sheet folding machine including sheet
advancing means, suction operated sheet folding
shown in Figs. 9 and 10, are preferably arranged
so as to be adjustable in the direction transversely
means and a normally open suction circuit con
to the cross fold corresponding to the varying
necting said means to a suction creating source,
3
2,106,053
said circuit being formed to provide an opening » circuit, said circuit closing means being positioned
in the 'plane of and within the limits of the path in the plane of and vwithin the limits of the path
oi' advance of the sheets and adapted to be over
of advanceof the sheets and adapted to be over
laid by each of said sheets at a predetermined laid by each oi' lsaid sheets at a predetermined
point in said advance to close said circuit and point in said advance to close said second circuit
and 'actuate said valve to close said first circuit
actuate said folding means.
~
A .
5. The structure of claim 4, and said portion of to actuate said folding means.
8. The structure of claim 7, and said` circuit
said circuit providing said opening being adapted
to be adjusted laterally and longitudinally in a closing means in said second circuit being adapted
horizontal plane.v f
^
.
to be adjusted laterally and longitudinally in a
.
-6. The structure of claim 4, and the actuation
of said folding means causing movement of said '
sheet to uncover said opening automatically
thereby opening _said circuit and breaking the
same.
,
7. In a sheet folding machine including sheet
advancing means, suction operated sheet folding
means, and a suction circuit connecting said
means to a suction creating source, a valve in said
-circuit, said valve being normally positioned to
break said circuit, suction means including a nor
` mally open and relatively weak circuit for closing
said valve. circuit closing means in said second
horizontal plane.l
Y
I
9. The structure of claim 7, said circuit clos
ing means in said second circuit being adapted
to be adjusted laterally and longitudinally in a
horizontal plane, and the actuation of said fold 15
ing means causing movement of said sheet to open
said circuit closing means automatically ’an ,
break said second circuit.
'
10. The structure of claim 1, and said portion `
of said line containing said opening being adjust 20
able to permit its being positioned on said
machine.
>
-
.
RICHARD LUDEWIG.
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