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Патент USA US3088152

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May 7, 1963
H. w. WEEKS
3,088,144
MACHINES FOR OPERATING UPON MARGINS 0F WORKPIECES
Filed April 18, 1961
4 Sheets-Sheet 1
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HoraceWh/eeks
By his Az‘iorney
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May 7, 1963
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3,088,144
MACHINES FOR OPERATING UPON MARGINS OF WORKPIECES
Filed April 18, 1961
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H. w. WEEKS
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4 Sheets-Sheet 2
May 7, 1963
H. w. WEEKS
3,088,144
MACHINES FOR OPERATING UPON MARGINS 0F WORKPIECES
Filed April 18, 1961
4 Sheets-Sheet 3
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May 7, 1963
H. w. WEEKS
3,088,144
MACHINES FOR OPERATING UPON MARGINS OF WORKPIECES
Filed April 18, 1961
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United States Patent
3,688,144
Patented May 7, 1963
1
2
3,088,144
mechanism, of means including a work steering member
for guiding the work piece automatically as it is fed past
said instrumentality, said guiding means comprising a
MACHINES FOR OPERATING UPON MARGINS
OF WORKPIECES
presser unit which is synchronously cooperative with
Horace W. Weeks, Dayton, Ohio, assignor to United Shoe
Machinery Corporation, Boston, Mass., a corporation
both the work steering member to generate a turning
moment and with the instrumentality to create a center
of New Jersey
Filed Apr. 18, 1961, Ser. No. 103,744
11 Claims. (Cl. 12--55.1)
about which the turning moment may move the work.
It will be recognized that in some aspects the work guid
ance means herein disclosed resembles that described and
This invention relates to machines for progressively 10 claimed in the copending Clemens et a1. application above
cited. Thus the steering member is in each case shown
operating automatically on the margins of work pieces,
as a servo-controlled work engaging wheel having a
and is more particularly concerned with the provision of
velocity corresponding to the marginal curvature of the
improved means for automatically guiding and acting on
work as sensed in a locality close to, but just ahead of,
the irregularly curved edges of sheet material. The in
vention is herein illustrated as embodied in a machine 15 the operating instrumentality. For determining the wheel
for folding the edges of shoe uppers to provide them
with an attractive, ?nished appearance.
It is to be recog
velocity, the curvature is, moreover, preferably sensed
electrically as hereinafter disclosed by means of a circuit
including a light sensitive device arranged at one side
nized that in various aspects application of the invention
of the work to respond to rays beamed from a source
is not thus limited.
on
the opposite side and passing the margin of the work
20
In operating many machines proper manual direction
in a locality just ahead of the operating instrumentality.
and advancement of individual work pieces, especially
The latter is herein exempli?ed in the form of a creaser
those which are ?exible and irregularly shaped, is tedi
ous and often inaccurate.
Accordingly as disclosed in
an application for United States patent, Serial No. 94,556,
lled March 9, 1961, in the name of John E. Clemens et
al., and in an application for United States patent, Serial
No. 827,970 ?led July 17, 1959, in the name of H. F.
Schaefer, Jr., et al., now Patent No. 2,979,745, work
guidance mechanism has been designed for automatically
determining the operating path of a tool in accordance
with controlling curvature, such as that of the edge of
V the work to be processed, thereby relieving an operator
of considerable routine care. While the work steering
means in each of these disclosures is responsive to a
against which a conventional, oscillatory folding ?nger
is moved to fold successive marginal portions of the
work. These successive portions are illustrated as being
fed in translation and step by step by means of the
usual oscillatory, cooperative hammer and anvil feeding
mechanism which is also employed, as customary, to
press the fold formed by the creaser and folding ?nger.
Contributing markedly to simplifying an otherwise
crowded machine organization as well as enhancing its
reliability, the automatic Work guidance means, though
shown as being continuously operative, is made effec
tively to alternate with feeding movements of the ham
curvature sensing circuit, the Clemens et al. arrangement 35 mer and anvil, the guidance means including a cam
actuated presser unit. The latter consists of a roll ar
embodies a torque exerting mechanism operative at only
ranged to cooperate with the steering wheel and an arm
a single locality to turn the work about successive work
carrying the roll and arranged to cooperate with the
engaging positions of an operating tool, and the Schaefer
creaser. Positive actuation of the presser unit accord
et al. approach involves a pair of spaced work engaging
ingly is such that in each interval that the feeding mech
members which are respectively reversible and have
anism is inoperative to feed and press a folded marginal
velocities the ratios of which are ?xedly proportionate
portion, the steering wheel with the aid of the roll is
to the curvature of the margin being operated upon. It
enabled to exert a torque on the work properly to turn
is recognized that automatic guidance of work is broadly
old, especially in the machine tool ?eld, but it is par 45 it bodily about an instantaneous center simultaneously
established at the foot of the creaser where the Work
ticularly to be noted that the novel guidance concepts
is being momentarily clamped for the purpose by the
referred to and hereinafter further explained are more
presser unit arm. It will be appreciated that in selected
especially adapted for use on lighter work, especially
embodiments
of the invention it may be preferable to
sheet material, and are readily distinguished in that the
steering means, in lieu of moving a work carriage for 50 provide an independent abutment (in lieu of employing
any portion of an operating instrumentality such as a
‘instance, is advantageously arranged to act directly on
creaser foot) for creating a turning center.
the work itself.
Further to relieve an operator of the burden of con
The peripheral operation selected for present purposes
tinuous, close attendance during operation of the machine,
of illustration of this invention is that of edge folding,
a technique in which the margin of sheet material, such 55 certain functions hitherto requiring his control or decision
‘have now been rendered subject to automatic control.
as fabric or leather or the like, is folded back and
secured upon itself to create a new, smooth, and attrac
tively ?nished edge. The Schaefer et al. disclosure re
ferred to above likewise teaches the combination with
an edge folding mechanism of automatic means for guid 60
ing the work to such mechanism. It is a primary object
Thus a further feature of the invention as shown in the
exemplary machine comprises, in combination with auto
matic work guidance means of the type aforementioned,
control mechanism including a circuit having a light sen
sitive device disposed to ‘be covered by the work when
its margin is ?rst presented to the curvature sensing means
of the present invention, however, to provide a simple
referred to above, the control mechanism thereby being
and further improved machine, for instance of the edge
actuated (I) initially to lower the steering wheel into its
folding type, wherein the operating instrumentalities are
operating position and (2) to initiate the ?ow of cement
advantageously disposed in combination with novel auto 65 to the folding locality via an outlet formed in the
matic work guidance means and certain auxiliary con
creaser. Additionally, control circuitry is advantageously
trols additionally insuring quality performance on a
provided wherein light sensitive devices are disposed ahead
greater variety of work.
of the operating zone and respectively responsive auto
In keeping with the object just stated, a feature of
matically to shorten feeding increments in traversing out
the invention resides in the provision, in combination 70 side curvature wherein the radius of curvature is less than
with a work support, an operating instrumentality adapted
a predetermined distance, and to initiate a margin snipping
to act on the margin of a work piece, and a work feeding
cutter for facilitating traversing inside curvature wherein
3,088,144
3
4
the radius of curvature is less than a predetermined dis
width as determined by the gage ?nger 28. Additionally,
tance.
the guidance means 24 comprises a presser unit generally
The above and other features of the invention, together
designated 46 (FIGS. 2-4 and 9) operative heightwise
with various novel details of construction and combina
tions of parts, will now be more particularly described in
connection with an illustrative embodiment thereof and
with reference to the accompanying drawings in which:
in a slot of the plate 16 and by means of which the velocity
of the wheel 42 is caused, in the intervals in which the
FIG. 1 is a view in side elevation of a machine exem
hammer and anvil are inoperative to feed, to exert an
appropriate steering torque on the work. For this pur
pose, much as in the Clemens et al. copending applica
plifying the invention, frame portions being cut away to
tion above cited, the Wheel 42 is driven by a curvature
reveal internal mechanism;
sensing circuit later to be explained which is responsive
FIG. 2 is an enlarged view of the operating instru
to the change in curvature of the edge of the work at a
mentalities shown in FIG. 1 with automatic work guidance
point close to, but just ahead of, the gage block 26 in the
mechanism in operative position and being shown in sec
work zone. The unit 46 includes a presser roll 48 co
tion to reveal construction details;
operative with the perimeter 44 and a rocker arm 50 by
FIG. 3 is an end elevation of operating elements shown 15 which the roll is carried heightwise, the arm having an
in FIG. 2 and indicating the relative position of a presser
upstanding portion 52 formed and arranged to serve in
unit of the guidance mechanism;
termittently as a pivot for the work when the latter is
FIGS. 4-7, inclusive, are diagrammatic plan views illus
bodily turned thereon by reason of the cooperation of
trating successive positions of a portion of an upper of
the wheel 42 and the roll 48. The pivot portion 52, it
a shoe as it is sensed by a guidance cell and associated 20 may be noted, corresponds in part with an element termed
light responsive controls;
a “gripper” in the cited Naugler patent and is similarly
FIG. 8 is a left-hand elevation of shaft positioning
actuated, by means about to be described for intermittently
means for controlling stop positions of the several instru
pressing the work against the under side of the creaser
mentalities;
foot 32. The functional aspect shared by both the pivot
FIG. 9 is a plan view of the presser unit shown in 25 portion 52 and the “gripper” element referred to is that
FIGS. 2 and 3; and
of holding the work against rectilinear movement during
FIG. 10 is an electrical diagram of the machine.
the folding of successive marginal portions; while the
The invention is herein shown as embodied in a Ce
“gripper” in the earlier disclosure also held the work
menting and Folding Machine of the type disclosed
against rotary movement in the intervals of folding, it
basically in United States Letters Patent No. 2,270,891 30 should be noted by way of contrast that the pivot portion
on an application of C. A. Newhall and more recently
improved as illustrated in United States Letters Patent
No. 2,720,667, granted October 18, 1955 on an applica
tion of W. E. Naugler. In view of the complete descrip—
52 in the present disclosure serves to create a turning cen
ter for the work at the locality of its contacts with the
creaser foot and with the portion 52 thereby permitting
chine is described below as is essential to a full under
angular translation as required to remove any error sig
35 nal from the guidance means 24.
The creaser foot 32, as in the Naugler construction
standing of the present invention, FIG. 1 largely corre
sponding with FIG. 1 of the Naugler patent.
referred to, is heated and provided with a passageway (not
shown) for delivery of adhesive to be applied to the work
A hollow base 10 of the machine has an arm 12 pro
vided with a removable end portion 14 on which is se
40 hesive is supplied from a receptacle 54 (FIG. 1) and
cured a work supporting plate 16. A cap 18 (FIG. 1)
exuded from a beveled face of the creaser foot for coat~
mounted on the base has a neck 20 overhanging the arm
12 and terminates in a removable head 22. The operat
ing of the under side of the upturned lip of the margin,
tion and illustrations therein, only so much of that ma
immediately prior to the folding operation. The ad
the ?ow being controlled by a valve 56 (FIGS. 1 and 2)
actuated by a Bowden wire 58 operable by a solenoid
means generally designated 24 (FIGS. 1 and 2) later to 45 60 further referred to hereinafter. It will be recognized
be described, largely resemble those of the earlier men
that in applying this invention to organizations wherein
tioned construction in form and mounting and comprise
no instrumentality (such as the creaser foot) is available
a gage block 26 for de?ecting upwardly the margin to
to mad with the portion 52 to provide a turning center,
be folded, a gage ?nger 28, and a folding ?nger 30 for
an abutment should be incorporated for this purpose.
folding the margin of the work against a creaser foot 32. 50
For operating the presser unit 46 (and hence effective
In conventional manner a hammer 34 (FIGS. 1 and 2)
ly operating the guidance means 24) in proper time rela
cooperates with an anvil 36 to press the fold when it
tion to the operation of the feeding and operating in
has been formed, the hammer and anvil acting together
strumentalities, use is made of actuating mechanism dis
to feed the work rectilinearly a step at a time past the
closed in the Naugler patent. A main shaft 62 (FIGS.
gage block 26 and away from the observer in FIGS. 1 55 1 and 2) journaled in the base 10 and the arm 12 is
and 2. A snipper knife 40, operable on sharply incurved
provided vwith a pulley 64 that is connected by a belt 66
margins of the work, also is provided, its actuating mech
to a motor 68 (FIG. 10). The rocker arm 50 (FIGS. 2
anism being essentially as shown in the Naugler patent re
and 3) is mounted on the outer end of a rock shaft 70
ferred to above but subject to improved control means
journaled in the arm 12 and parallel to the shaft 62. A
60 release arm 72 (corresponding to the arm 50 in the
hereinafter explained.
For automatically guiding the margin of a work piece,
Naugler patent) is secured to the inner end of the shaft
for instance that of an upper U (FIGS. 4-7 inclusive),
70 and forms means by which it may be rocked by an
to the work zone of the operating instrumentalities men
operator to lower the presser unit 46 when desired. The
tioned, the means 24 comprises a single, continuously
release arm 72 ('FIG. 1) has a downwardly extending
operative steering wheel 42 (FIGS. 1, 2 and 3) herein 65 portion having a rounded cam follower end 74 arranged
ing instrumentalities, other than automatic work guidance
shown as being reversibly rotatable on a ?xed horizontal
to engage a cam 76 (FIGS. 1 and 3) mounted on the
shaft 62. The cam 76 is integral with a collar 78 ad
axis and having a work engaging perimeter 44. This
justably secured by a pinch screw 80 to the shaft 62, and
perimeter is preferably serrated and disposed to contact
the upper surface of the work at a locality inwardly of its 70 a spring 82 (FIG. 3) in the arm 12 normally maintains
margin and substantially opposite to the cooperative ham
mer and anvil, or more precisely, opposite to the point
from which they commence their feeding strokes, as III-1
engagement of the portion 74 with the cam 76 so that
rotation of the shaft 62 will cause the presser roll 48 and
the pivot portion 52 substantially simultaneously to move
dicated in FIG. 3, the margin then being de?ected up
into and out of engagement with the under side of the
wardly by the gage block 26 to the extent of the fold 75 upper U being guided in the machine. By adjusting the
3,088,144
collar 78 with respect to the shaft 62 movements of the
presser unit 46 may be varied in a cycle of operations.
, For imparting steering torque to the work when it is
engaged by the presser roll 48 and is thereby urged against
the perimeter 44, the wheel 42 is continuously driven by
a curvature sensing circuit including a servo motor 84
(FIGS. 2 and 10) responsiveto a light sensitive device
6
slots serve also to hold the core and hence the wheel 42
against movement about a vertical axis but still allow
the wheel 42 to move vertically when a variation in work
thickness is encountered. A nut 136 threaded on the core
114 bears against the collar 135 and thereby controls
the steering wheel pressure against the work.
Referring to FIG. 10, and assuming the motor 68 has
herein shown as a guidance solar cell 86 (FIGS. 4—7)
removably mounted on a level with the upper surface of
been started by closure of a motor switch 140 and a
in a detachable plate 88 and disposed transversely of the
rectilinear feed effected by the hammer and anvil and
immediately ahead of the gage block 26. Preferably the
arrangement is such that a mid point of the cell 86 sub
stantially coincides with a null line parallel to the direc 15
122 and accordingly a relay K1 is deenergized to close
contacts K181, KllBZ, and K1136, and open a contact
treadle switch 142, the initial presentation of the upper
the work supporting plate 16, the cell 86 being preferably 10 to the machine removes a signal from the covered cell
tion of zero error feed, or explained in other words, the
cell is disposed transversely of the general direction of
feed effected by the hammer and anvil so that, when the
operating locality of the upper is ‘correctly oriented with
KlAl.
A time delay relay K2 is thereby energized
through the contact K1132 and, after a ?xed time delay,
opens a contact K2B1 to deenergize the solenoid i120 and
thus lower the wheel 42 into operating position. The
time delay is su?icient to permit the margin of the work
to be introduced thereunder and over the roll 48, for
engagement with and de?ection by the gage block 26.
respect to the gage block 26, about one-half of the cell 20 At the same time the closure of the contact K133 ener
gizes the solenoid 60‘ whereby the valve 56 is opened to
is covered by the work acting as a shutter, and the other
initiate
the ?ow of adhesive through the creaser foot.
half of the cell is exposed to light focused from an in~
If it is desired to run the machine continuously, incident~
candescent source shown herein as a lamp 90 (one only
ally, in lieu of using the treadle switch 142, a push but
shown in FIGS. 1 and 2 but two adjacent lamps prefer
ton
PB may be depressed for starting the motor 68 and
25
ably being employed) bracketed to the head 22.
again depressed to stop it. For facilitating more uni
' 'In the curvature sensing circuit, which is essentially as
described more fully in the Clemens et al. application re
ferred to above, a DC. voltage is generated in the cell
-86 when it is more or less covered by reason of a change
in marginal curvature in that locality of an upper ap 30
proaching the block 26. Accordingly this voltage is di
rected to a preampli?er unit 92 (FIG. 10) and, opposed
by voltage from a bias supply 94, creates a net voltage
difference constituting an error signal. The voltage phas
ing of thissignal by known means provides proper direc 35
tion of rotation information for the servo motor 84, and
the output of the preampli?er unit 92, after being ampli
?ed in a servo ampli?er unit 96, is fed to the motor 84.
form edge folding and obtaining a neatly ?nished prod
uct with a minimum of effort on the part of the opera
tor, the control plate 88 has additionally embedded there
in, at opposite sides of the line of rectilinear or “no er
ror” feed, a device sensitive to the light source 90‘ and
shown as a solar cell ‘1146 (FIGS. 4—7 and 10), and an
other device sensitive to the same source and shown
herein as a solar cell 148 (FIGS. 4—7 and 10). These
cells are disposed ahead of the cells 86 and 1122. The cell
146 is so positioned that, upon being covered at least
partially by an incurved marginal portion as shown in
FIG. 7, it is effective through its transistor ampli?er 147
(FIG. 10) to energize a relay K3 and thus close a con
In known manner, the “pure” error signal is modi?ed 40 tact K3A1 for energizing a solenoid 150' (FIG. 1). As
for damping purposes by a tachometer (not shown).
a result the snipper knife '40, instead of being under
For driving the steering wheel 42 the servo motor is
operator control as hitherto, is now automatically caused
mounted on a casing 98 (FIG. 2) bracketed to‘the head
to cooperate with the gage block 26 in shipping more
22 and has an output shaft 1coupled to reduction gearing
inwardly curved portions of the margin. It will be
(not shown) in a housing 100 ?xedly secured by screws
understood that for this purpose a plunger .152 of the
45
102, 102 to the base of the casing. A vertical output
solenoid ‘150* corresponds with a treadle rod designated
shaft 104 depends from the reduction gearing and is
‘410 in said Naugler Patent, interconnecting means for
formed with a diametric slot 106 for slidingly receiving
operating the snipper knife remaining essentially as fully
a coupling pin 108 in the upper end of a rotary spindle
disclosed therein. The cell 1418 advantageously sup
110. The latter is journaled in spaced bearings112, 112
plants a manually operable means (including a treadle
mounted in a depending core 114. The lower end of the
rod 182, etc., in the Naugler patent) for changing the
spindle has bevel gear connection to a stub shaft 116
length of feed and folding increments imparted by the
journaled in a right-angle gear box 118 threaded on the
oscillations of the hammer and anvil. Thus, upon a
core :114 and carrying the steering wheel 42.
marginal portion of outside curvature approaching the
As shown in FIG. 2 the machine is at rest and the
operating zone, as shown in FIGS. 5 and 6, the cell 148
wheel 42 is in its lower, operative position. The wheel 55 becomes suf?ciently uncovered to emit a voltage signal
42 is raised automatically before starting the machine to
via its transistor ampli?er 1154 (FIG. 10) whereby a re
permit introduction of a work piece to be edge folded,
lay K6 is energized to close a contact K6A1. As a conse
and for subsequent work ejection. For this purpose a
quence, a solenoid 156 (FIG. 1) acts on an arm 158
solenoid 120 (FIGS. 2 and 10) secured to the casing 98
(against a return spring not shown) to rotate a feed
is deenergized by initial presentation of a margin of the
control shaft 160* and hence automatically shorten the
work to cover a light sensitive cell v122 (FIGS. 4—7 and
feeding increments appropriately for the interval in which
10) which is also mounted in the plate 88 and adapted
the outside curvature is being folded.
to control cement flow as will be explained. The sole
As illustrated in FIG. 8, the machine is preferably
noid core 114 is slidable axially on a sleeve 126, and the
65 provided with means generally designated 180 for posi
lower limit of movement of the cone is determined by an
tioning the main shaft 62 at the termination of each ma
inward flange of a retainer nut 128 threaded onto the
chine operation so that the ?nger 30 will be in its down
solenoid 120. On being energized the solenoid raises its
position and the hammer and anvil will then be released
core 114 and consequently the wheel 42 against the re
from the work and separated heightwise to permit its
sistance of a return spring 130. An upper end of the 70 withdrawal and subsequent presentation of the next work
piece to be edge folded. This shaft positioning means is
latter abuts the housing 100 and a lower end bears on a
briefly described here since it corresponds largely with
collar 132 carried by the inner ends of screws 134, '134
the structure fully explained and disclosed in the Clemens
which are threaded radially through a ‘collar i135 slidable
et al. application above cited and is representative of
on the core 114 and respectively extend through vertical
slots 138 formed in the sleeve 126. These screws and 75 various shaft positioning mechanisms which may be
3,088,144
7
8
used. A variac 182 (FIG. 10) changes AC. voltage ap
be manually closed, thus deenergizing the solenoid 60 to
stop the flow of adhesive and energizing solenoid 120 to
discontinue automatic guidance thus enabling the ham
mer and anvil simply to feed the work margin directly
'
plied to a rectifying bridge 186 which, in turn, provides a
DC. voltage to the motor 68 as selected for controlling
its forward speed. The motor 68 is energized by closure
of the switch 142 to energize relays K4 and K5, resultant
AC. voltage being applied to a recti?er bridge 186
through a contact KSAI and directed as DC. voltage
through contacts K4A1 and K4A2 to the motor. When
out of the work zone.
Having thus described my invention, what I claim as
new and desire to secure by Letters Patent of the United
States is:
1. In a machine having a tool adapted to operate on
the foot switch 142 is released, a reversing DC. voltage
is applied to the motor 68; then upon opening of a 10 successive marginal portions of a work piece, mechanism
switch 183 by the means 180 as next described the AC.
voltage to the bridge cuts off and stops the motor to
stop the shaft 62 in the desired position. Secured on this
for feeding the work piece past the tool, and guidance
means including a movable member for steering the work
piece automatically, as it is fed, in accordance with the
shaft is a cam 190‘ (FIG. 8) having a rise over a 60°
curvature of the margin to be operated upon, said guid
arc. The cam is straddled by a cam plate 192 radially 15 ance means comprising a presser having work engaging
slidable in a guideway 194 formed in a guide plate 196,
portions one of which is arranged to cooperate with the
the latter being a?ixed to the pulley 64. During forward
member to exert a turning moment and another of which
or folding operation the torque required to rotate the
is cooperative with the tool to determine successive cen
shaft 62 reacts on the cam plate 192 causing it to retract
ters about which the turning moment can act to guide
the work piece.
radially inward, and when fully retracted a ?at of the
cam engages the plate 196 internally in ?xed driving rela
2. ‘In a machine having a tool for operating along the
tion. On opening the switch 142 the relays K4 and K5
margin of a work piece, a work support, an abutment ad
are deenergized, and a relatively low AC. voltage is ac
jacent thereto, mechanism for feeding the work piece on
cordingly applied to the recti?er bridge 186 through a
the support in translation past the tool and the abutment,
now closed contact K5131 (FIG. 10). This gives rise to 25 guidance means including a curvature sensing circuit re
a DC). reversing voltage being applied to the motor 68
sponsive to change in edge curvature of the work piece
through now-closed K4B1 and K4132. Accordingly,
at a locality ahead of the tool and a steering wheel con
when the machine has stopped and its shaft 62 starts to
trolled by the circuit and engageable with the work piece
reverse (in counter-clockwise direction indicated in FIG.
inwardly from the tool, a pair of presser feet mounted
8), the cam plate ‘192 is radially displaced outwardly 30 for movement heightwise relative to the support for
spaced engagements with the work piece and cooperation,
until its projection 198 engages the upper end of a lever
200 pivoted at 202 on a bracket 204 a?ixed to the ma
respectively, with the wheel and with the abutment, and
chine frame. This engagement pivots the lever 200
means for simultaneously effecting such engagements of
clockwise as viewed in FIG. 8 against resistance of a
the presser feet in time relation to said feeding mecha
spring ‘2&6 and hence opens the switch 188 to stop the 35 nism.
motor and its shaft 62 in proper position. A stop pin
3. In a machine having a movable member for exert
208 in the bracket 204 cooperates with the spring 206
ing steering torque on a work piece and an adjustable
in determining the normal inoperative position of the
abutment against which the work piece may be pressed to
lever 200.
provide a turning center for said torque, curvature sens
From the foregoing it will be clear that this invention 40 ing means for controlling the velocity of said member,
provides a machine for performing marginal operations,
for instance edge folding, expeditiously and with little
burden on the operator other than to present and remove
mechanism for feeding the work piece step by step in
translation, and presser means synchronously cooperative
with the member and abutment during non-operation of
the feeding mechanism for causing the work piece to be
successive work pieces. In presenting an upper U, after
closing the switch 142 to start the motor 68 and hence 45 turned bodily about said center, said presser means hav
commence actuation of the rectilinear feeding means and
ing a cam actuated driving connection to said feeding
mechanism.
operating instrumentalities, the cell 122 is covered auto
matically causing the steering wheel 42 to be lowered
4. In a machine having an edge ?nishing tool and an
after a suitable time delay during which it is possible to
abutment adjacent thereto, mechanism for feeding a work
admit the margin about half way over the guidance cell
piece past the tool and beneath the abutment, means in
86 and against the gage 26 and the ?nger 28, and the
cluding a reversible torque exerting member for automati
valve 56 to be opened for the flow of adhesive to the
cally steering the work piece about a turning center on
margin about to be folded. The presser roll 48, due to
the abutment as the work is fed with respect to the tool,
the cam 76, is elevated intermittently together with the
said means including a presser unit having spaced por
pivot portion ‘52 into effective work engaging or steering 55 tions arranged to press successive localities of the work
relation with the under side of the upper. These steer
piece into engagement, respectively, with the member and
ing engagements are thus caused to alternate with the
said abutment, and power means for cyclically changing
rectilinear feeding steps effected by the hammer and
anvil, torque being imparted as continuously directed by
the pressure of such engagements whereby the work piece
is intermittently swung about said center.
the servo motor in accordance with the guidance signal 60
5. ‘In an edge folding machine, a work support, edge
derived from the cell 86, intermittently to swing the
folding means including a work engageable creaser hav
upper bodily about the turning center which is created
ing an outlet for adhesive, mechanism for feeding a work
by the cooperating localities of the creaser foot 32 and the
piece on the support in translation and intermittently
presser portion 52. In this manner steering “error” is
past the creaser, guidance means including a work en
continuously being reduced to zero and a uniform width 65 gageable wheel for automatically steering the work piece
of folded margin is obtained which corresponds with the
with respect to the folding means according to the curva
initial contour of the unfolded margin.
ture of the margin of the work piece in a locality ahead
During the automatic guidance of a work piece the
of the creaser, said guidance means including a ?rst light
cell 146 serves automatically to actuate the shipper 40
sensitive device arranged on the support for sensing said
as needed on sharper inside marginal curvature, and the 70 curvature, valve means for controlling the supply of ad
cell 148 serves automatically to shorten the feeding and
hesive to the creaser outlet, and a control circuit includ
folding increments as required for successfully negotiat
ing a second light sensitive device disposed to be covered
ing the sharper outside marginal curvature. If for any
by the work piece when its margin is ?rst presented to
reason it is desirable promptly to remove a work piece
the ?rst light sensitive device whereby the wheel is auto
from the machine a kick out switch 210 (FIG, 10) may 75 matically shifted into its work engaging position and said
3,088,144
valve means permits the flow of adhesive through the
creaser.
6. In work guidance mechanism of the class wherein a
movable member is frictionally engageable with the work
to apply torque for steering it bodily about the work con
tacting locality of an operating tool spaced from the mem
10
which the devices are responsive, respectively, upon rela
tive light-intercepting movement of the margin.
10. In an edge folding machine of the type having an
edge gage block and a hammer and anvil movable to
feed the margin of a work piece step by step past the
block, a work support, a source of light above the sup
port and focused on an operating zone of the support just
ber, the combination with said mechanism of a drive shaft
ahead of the block, automatic work guidance means in
rotatable to feed the work in a cycle of operation in trans
cluding a ?rst light sensitive device in said zone imme
lation past the tool, and cam actuated means controlled
ahead of the block, a second light sensitive device
by said shaft for timing the effective and ineffective op 10 diately
in said zone farther ahead of the block, and means re
eration of the steering member in each cycle.
sponsive to the second device upon relative shutter move
7. In a machine having a tool adapted to operate on
ment of a margin to be folded for causing the hammer
the margin of a work piece and of the type having auto
and anvil automatically to change the length of feed
matic means for feeding and guiding the margin in in
steps.
crements to the tool, said means including a ?rst device 15
11. In a machine of the kind having an edge gage for
on one side of the work piece responsive to light from
turning the margin of work to be edge folded, and com
a source on the other side thereof, a second device ahead
prising means for intermittently feeding the work step by
of the ?rst device and responsive to light from said source,
step past the gage, a creaser against which the turned
and a control circuit including the second device for
margin
is folded and through which adhesive is delivered
20
automatically changing the increments of feed as curva
to the margin before it is folded, and automatic work
ture of the margin changes.
guidance means including a continuously operative steer
8. A machine as set forth in claim 7 further charac
ing wheel arranged yieldingly to engage the work inward
terizing in that the second device is arranged with respect
ly from the creaser, the combination with a presser unit
to the ?rst to shorten the feeding increments to facilitate
cooperative with the steering wheel and the creaser to
operation upon marginal portions of outside curvature 25 cause
the work to be guided in the non-operating intervals
having at least a predetermined radius of curvature, an
of the feeding means, of means responsive to initial pres
instrumentality is provided for operating on marginal por
tions having inside curvature, and a third device respon
sive to light from said source is arranged automatically
to actuate said instrumentality.
9. ‘In an edge folding machine of the type having an
edge gage block and step by step means for feeding the
margin of a work piece on a work support past said
block, a control plate removably mounted in said support,
automatic work guidance means including a ?rst light 35
sensitive device in the plate disposed immediately ahead
of the gage block, a tool adapted to act on incurved por
tions of the margin to be folded, a second light sensitive
device disposed in the plate ahead of the ?rst device for
automatically actuating ‘the tool, and a source of light to 40
entation of the work toward the gage to admit the mar
gin between the wheel and the presser unit and initiate
delivery of the adhesive and in the absence of the mar
gin to discontinue delivery of the adhesive.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,259,502
2,270,891
2,720,667
2,849,734
2,979,745
Topham et al. ________ __ Oct. 21,
Newhall ____________ __ Jan. 27,
Naugler ____________ __ Oct. 18,
McGahan ____________ __ Sept. 2,
Schaefer et al. ________ __ Apr. 18,
1941
1942
1955
1958
1961
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