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Патент USA US3066612

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Dec. 4, 1962
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3,066,602
AUTOMATIC SCREEN PRINTING MACHINE
Filed Aug. 13, 1959
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Dec. 4, 1962
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AUTOMATIC SCREEN PRINTING MACHINE
Filed Aug. 15, 1959
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Dec. 4, 1962
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AUTOMATIC SCREEN PRINTING MACHINE
Filed Aug. l5, 1959
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AUTOMATIC scEEEN PRINTING MACHINE
Filed Aug. 13, 1959
4 Sheets-Sheet 4
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INVENTIDR
HISÄKICHI IÉHINÜSE
United States ¿Patent
le
3,065,602
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Patented Dec. 4, 1962
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3,066,602
FIGS. l to 4 show the automatic screen printing ma
chine to be equipped with this invention. Frame 1 ex
Hisakichi Ichinose, S7 Sanhaneho, Kousiien, Nishino
tends the entire length of this machine, at one end of
which is a driving roller 2, at the other end is a following
Filed Aug. 13, 1959, Ser. No. 333,629
Claims priority, application Japan Nov. 11, 1958
1 Claim. (Cl. 101-115)
roller 3. Between these rollers is stretched an endless
belt 4 in such a way that the said belt 4 may be intermit
tently advanced in the direction shown .by the arrow mark
by intermittent revolutions of a driving roller 2. In this
AUTOMATIC SQREEN PRENI‘ENG MACHINE
miya, Hyoga, Japan
The present invention relates to a driving mechanism
for intermittently moving a belt on a screen printing
machine in which the speed of the drive is slow at the
beginning of the movement, fast in the middle of the
movement, and slow at the end of the movement.
It is an object of the present invention to provide a
driving mechanism for screen printing machines in which
the patterns in the screen are printed more accurately
way, the following roller 3 is also revolved intermittently.
Above this endless belt 4, a plurality of printing frames 5
are arranged (FIGS. 2 and 4 show l0 printing frames)
and all of them are held by main frame 6. Extending
in the transverse direction of the said main frame 6 are
several guide rails '7 (FIGS. 2 and 4 show 6 guide rails),
on which squeegee holders 8 are placed so as to be mov
able reciprocally in the transverse direction of printing
than heretofore by properly operating the driving mecha
frames at the required time.
nism to accurately position the belt relative to the
screens, and yet to drive the belt between printings as
fast as possible.
It is a further object of the present invention to pro
vide a driving mechanism for screen printing machines
which drives the belt intermittently at an average high
speed, yet which does so by driving the belt slowly at the
beginning of the intermittent movement, fast in the mid
dle of the intermittent movement, and slow at the end
of the intermittent movement while not causing elonga«
tions and contractions of the belt due to the acceleration
and deceleration forces.
It is a still further object of the present invention to
provide a driving mechanism which comprises a driving
shaft, a driving gear mounted on said shaft and having
teeth around only a portion of the circumference of the
be joined to each other throughout the full length of the
gear, a driven shaft having a first and a second portion,
a driven gear mounted on the first portion of the driven
shaft engageable only with the teeth on the driving gear,
a ñrst lever arm having a radially extending slot therein
on the end of said first portion of said driven shaft
closest to said second portion of said driven shaft, a
These squeegee holders can
frame, or occasionally a few of them can be mounted to
move independently of the others. From these squeegee
holders, two or more squeegees are hung in each printing
frame so as to come in contact with screens which are
stretched across the bottom of each printing frame. Coi
or paste is stored between the said squeegees to print
cloth through the screen 56 when the squeegee slides on
the screens. At the entry end of the frame 1, the feeding device 9 for cloth 51 to be printed is installed so that
the cloth 51 is continuously fed from the entry to the exit,
being agglutinated on the endless belt in accordance with
the advances of endless belt. At the exit of the frame,
the dryer 1li is installed for the after-treatment of printed
cloth as shown in FIGS. l and 3. The dryer 1G is
equipped with a cloth discharge apparatus 11.
FIGS. 5 to 8 show the mechanism for providing the
intermittent motion which is installed at the left end of
FIG. 4 and constitutes an essential part of this machine
according to the invention.
Referring to FIG. 5, there is shown a simple and ac
curate driving mechanism.
Casing 17 has shafts 1S, 19,
slider slidable in said slot, a crank shaft to one end of 40 20, 21 and 22 mounted in parallel therein. Shaft 18 is
coupled at one end thereof with the driving roller 2
which said slider is eccentrically pivoted, a second lever
through gears 23 and 24 and is coupled> at the other end
arm »having a radially extending slot therein on the
with shaft 19 through gears 25 and 26. The driving shaft
other end of Said crank shaft, and a further slider in the
2Q is coupled with shafts 19 `and 21 through an intermit
slot in said second lever, said slot in said second lever
tent rnotion device having gears 28 and 39 meshing with
arm extending in the diametrically opposite direction
gears 27 and 33 which have teeth only part way around
from the radially extending slot in said first lever arm,
the circumference thereof. Gears 27 and 38 are secured
said `further slider eccentrically pivoted to said second
together on a common hub shaft 22 through gears 28a
portion of saidl driven shaft. The provision of this driv
and 29 and clutch 32, or through gears 30 and 31 and1
ing mechanism makes it possible to connect it to one of
the rollers of the screen printing machine to produce the 50 clutch 32. Clutch 32 couples either gears 28a and 29'
to shaft 22 or gears 30 and 31 to shaft 22 so that the
slow~fast-slow motion already described.
Other and further objects of the present invention
intermittent revolutions of shaft 21 are transmitted to
will become apparent from the following specification
shaft 22 at either one of two speeds. Furthermore, one
end of shaft 22 projects from casing 17. The projecting
and claim, taken together with the -accompanying draw
55 end is directly coupled with elements 33 and 34 whichings, in which:
may `actuate frame 6 holding printing frames 5 and
FIG. 1 is a side elevation view of an automatic screen
printing machine according to this invention.
squeegee holders 8. One end of driving shaft 20 is con
FIG. 2 is a side elevation View of the remainder of the
nected by a gear 36 to an electric motor 35 (FIGS. 2 and
machine of FIG. l, the ñgures joining each other on -line
4) and the other end has sprocket wheel 37 thereon to
60 deliver power to the squeegee moving mechanism or the
T_T.
mother frame. The gear 38 is engaged with a gear 39
FIG. 3 is a plan view of the portion of the machine
having a projection 39a thereon engageable with the
shown in FIG. l.
smooth portion of gear 38. Gear 39 is mounted on the
FIG. 4 is a plan View of the portion of the machine
shaft 47 which is supported in bearings 46 at both ends
shown in FIG. 2.
FIG. 5 is a plan View, partly in section and on enlarged 65 and has a disc 40 on one end thereof.
scale, of the mechanism for the machine according to
Gear 33 and gear 39 are engageable either through the
this invention.
untoothed portion of gear 38 and the projection 39a on
FIG. 6 is a sectional view on line VI-VI of FIG. 5.
FIG. 7 is a sectional view on line VII--VII of FIG. 5;
gear 39, or through the teeth on the two gears. When
the concave end on projection 39a is engaged with the
70 untoothed portion :of gear 33, the gear 39 is held in the
and
FIG. 8 is a sectional view on line VIII-_VIII of
proper rotational position where the teeth thereon will be
FIG. 5.
engaged by the teeth on gear 38 when the teeth on gear
3,066,602
3
4
38 again come around to the point >adjacent gear 39.
When the teeth of both gears are engaged, power is de
livered to the driven gear 39 which is driven at a uni
form velocity during a certain period of time which is in
proportion to the number lof teeth in engagement. This
produces the intermittent motion described hereinbefore.
this motion, a cloth may be set accurately under the next
printing frame on which the next elementary pattern may
be printed.
This invention may effectively be used .to accomplish
`accurate and ingenious printing by preventing slips in pat
terns due to the elongation and contraction o-f the endless
A lever in the form of disc 40 mounted on one end of
rubber belt because both undue `stress and slackening of
shaft -47 driven by the gear 39 has a radial slot 41 cut
the said belt are satisfactorily prevented by the elements
Itherein. Crank pin 43 on crank 45 on the crank shaft
of the machine.
44 is guided in the said slot 41, either directly or indirect 10
It is thought that the invention and its advantages will
ly through a slider 42 on crank pin 43 as sho-wn in FIGS.
be understood from the foregoing description and it is ap
6, 7 and 8. Since’ the axis of crank shaft 44 is parallel
parent that vario-us changes may be made in the form,
to that of shaft 47 for the driven gear 39, the angular ve
construction and arrangement of the parts without depart
locity during one revolution or shaft 47 produces non
ing from the spirit and scope of the invention or sacrificing
uniform rotary motion of shaft 44 due to the eccentric 15 its material advantages, the form hereinbefore described
position of shaft 47 and the sliding of the crank pin 43
and illustrated in .the drawings being merely a preferred
in the slot 41. In other words, irrespective of the >amount
embodiment thereof.
of the eccentricity, `the initial and final velocities during
What I claim is:
one revolution of the shaft 44 may be kept low and the
A driving mechanism for one of the rollers in an auto
intermediate velocity within one revolution of the said 20 matic screen printing machine having a frame, rollers at
shaft may effectively be increased. By means of this
opposite ends of said frame and an endless rubber belt
slider crank mechanism, the intermittent motion of disc
around said rollers for supporting the cloth to be printed,
40 may satisfactorily be .transmitted through the said slid
said driving mechanism comprising a driving shaft, a driv
er crank mechanism from the disc 40 to the crank shaft 44.
ing gear mounted on said shaft having teeth around only
Furthermore, the motion of crank shaft 44 may either 25 a portion of the circumference thereof, a driven shaft
directly be conveyed to the driving roller 2 through gear
having a first and a second portion, a driven gear mounted
25, shaft 18 and gears 23 and 24 by omitting `the lever in
on said first portion of said driven shaft engagea'ble only
`the form of disc 48 and crank 49 (this modification is not
with the teeth on said driving gear, a first lever arm hav
shown), or to shaft 18 and driving roller 2 through a
ing a radially extending slot therein on the end of said
lever in the fo-rm `of a disc 48 similar to disc 40, a slider 30 first portion of said driven shaft closest to said second p0r
48a, crank pin 50 and crank 49 which are mounted be
tion of said driven shaft, a slider slidable in said slot, a
tween shaft 19 and crank shaft 44 in the mechanism as
crank shaft to one end of which said slider is eccentrically
shown in FIGS. 6, 7 and 8.
pivoted, a second lever arm having a radially extending
slot therein on .the other end of said crank shaft, and a
This structure produces a
greater variation between the initial and intermediate
speeds.
35 further slider in the slot in said second lever, said slot in
The structures of driving gear 27 on driving shaft 20
and driven gear 28 on shaft 21, are quite similar to those
of driving and driven gears 38 and 39 described hereinbe
fore. Through these gears, shaft 21 is intermittently ro
said second lever arm extending in the diametrically op
posite direction from the radially extending slot in said
first lever arm, said further slider eccentrically pivoted
to said `second portion of said driven shaft; whereby said
tated in a manner similar to the intermittent revolutions 40 driving mechanism is adapted to be connected to one o-f
of shaft 47 and driving roller 2 connected to shaft 47.
said rollers for intermittently driving the roller so that the
speed of the roller is slow at the beginning of the move
ment, fast in `the middle of the movement, and slow at
Accordingly, the motion of the driving roller and ele
ments 33 and 34 governing the motions of the mother
frame, printing frames and the squeegees is correlated with
the motion rof the belt.
As described hereinbefore, the initial and final veloci
ties during one revolution of the shaft 44 may be slow
and the intermediate velocity within one revolution of the
said shaft may be fast, irrespective of the amount of the
eccentricity.
the end of the movement.
References Cited in the file of this patent
UNITED STATES PATENTS
60
Accordingly, endless rubber belt y4 is also moved inter
mittently when -the driving roller 2 and other driving
parts are rotated through the gear system consisting of
both gears 38 and 39 and through »the slider crank mecha
msm.
The speed variation is one of the most essential func
tions of this printing apparatus according to the inven
tion. With the speed variation a cloth to be printed on
the endless rubber belt can be moved to the next printing
kframe 5 slowly at first, then fast and finally slowly. With
55
707,579
1,115,000
1,815,504
2,017,459
2,217,133
2,226,807
2,286,694
2,656,731
2,868,032
Gestetner ____________ __ Aug. 26, 1902
1914
1931
Martin ______________ __ Oct. 27,
Gorner ______________ __ July 21,
Howe ________________ __ Oct. 15,
Overlack ____________ __ Oct. 8,
lDe Save ____________ __ Dec. 31,
Talbot ______________ __ June 16,
Wildhaber __________ __ Oct. 27,
Millet ______________ __ Jan. 13,
2,902,878
1935
1940
1940
1942
1953
1959
Cupak ________________ __ sept. s, 1959
635,744
Great Britain ________ __ Apr. 12, 1,950
FOREIGN PATENTS
„viu.mw
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