U.S. patent number 3,586,312 [Application Number 04/772,769] was granted by the patent office on 1971-06-22 for envelope folder.
Invention is credited to David G. Sammons.
United States Patent |
3,586,312 |
Sammons |
June 22, 1971 |
ENVELOPE FOLDER
Abstract
An envelope folder including a feed mechanism, a scoring
mechanism, a folding mechanism, and a delivery mechanism. The feed
mechanism includes a separator arm for separating a single envelope
blank from the bottom of a stack of blanks, and for urging the
envelope blank against a rotary vacuum drum. The separator arm
includes rollers for rolling over the surface of the vacuum drum
and the envelope blank transferred to the vacuum drum. The scoring
mechanism includes scoring blades which are adjustable toward and
away from each other, and which are supported at various points
along their lengths. The folding mechanism comprises a pair of
rollers which urge each successive envelope blank to a
predetermined position, releases the envelope blank, and grasps the
envelope blank again and moves it in a different direction to
effect a fold on the score line on the envelope. The delivery
mechanism includes a disc defining curved slots for receiving
envelopes and carrying the envelopes to a stacking station, and an
endless belt extending around the axle of the disc and movable
toward the stacking station to gradually urge the envelopes out of
their respective slots as they approach the stacking station.
Inventors: |
Sammons; David G. (Atlanta,
GA) |
Family
ID: |
25096168 |
Appl.
No.: |
04/772,769 |
Filed: |
November 1, 1968 |
Current U.S.
Class: |
271/2; 271/101;
493/260; 493/242 |
Current CPC
Class: |
B31B
70/00 (20170801); B31B 2150/00 (20170801); B31B
2160/10 (20170801) |
Current International
Class: |
B31B
19/00 (20060101); B65h 003/10 () |
Field of
Search: |
;271/2,29,20,11,12,13 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wegbreit; Joseph
Claims
I claim:
1. In a machine of the type utilized for the manufacture of
envelopes, the improvement comprising means for accommodating
envelope blanks in a feed pile, separating means for separating a
portion of the bottom envelope blank from the feed pile, means
movable into the space between the bottom envelope blank and the
feed pile to move the envelope toward a vacuum drum, and roller
means movable toward engagement with the vacuum drum for positively
biasing the bottom envelope blank into engagement with the surface
of the vacuum drum, so that rotation of the vacuum drum withdraws
the bottom envelope from the feed pile.
2. The invention of claim 1 wherein said roller means is
constructed to remain in engagement with and roll over the surface
of the bottom envelope blank as the vacuum drum withdraws the
bottom envelope blank from the feed pile.
3. The invention of claim 1 wherein said separating means comprises
a vacuum arm movable toward and away from the bottom envelope blank
for applying a vacuum to the bottom envelope blank and separating
the bottom envelope blank from the feed pile, and wherein said
separating means further includes a retaining hook movable in a
direction generally parallel to the plane of the bottom envelope
blank for alternately supporting and releasing the bottom envelope
blank of the feed pile adjacent in the area of the bottom envelope
blank engaged by the vacuum arm.
4. The invention of claim 3 wherein said means movable into the
space between the bottom envelope blank and the feed pile is
constructed and arranged to move in a direction generally parallel
to the planes of the envelopes of the feed pile until it enters the
space between the bottom envelope blank and the feed pile and then
move in a direction generally toward the vacuum drum until the
envelope blank is grasped by the vacuum drum.
5. The invention of claim 1 wherein said vacuum drum is constructed
and arranged to rotate in a direction such that the bottom envelope
travels with the vacuum drum first in a downward direction and then
around the bottom of the vacuum drum.
Description
BACKGROUND OF THE INVENTION
In the manufacture of envelopes, paper is cut to form an envelope
blank, and the blank is folded, and its flaps are glued together.
While various machines have been utilized to perform the folding
and gluing functions, the machines presently in use are expensive,
occupy an excessive amount of working space, are not adaptable to
various sizes and types of envelopes, and jam frequently. Most
specifically, at the feed end of the envelope folding machines
previously utilized, the envelope blanks are usually arranged in a
feed stack, and the bottom envelope blank is retrieved from the
feed stack and processed through a path where it is scored, folded,
and glued. The various feeding mechanisms utilized for retrieving
the envelope blanks from the feed pile are inefficient in that they
frequently fail to retrieve an envelope blank, or they position the
envelope blank out of phase with the associated apparatus, or they
feed more than one envelope blank to the apparatus at a time, or
they otherwise generally malfunction to cause a jam in the folding
apparatus. One of the reasons for the malfunctioning of the
previously known feed apparatus is that it is sometimes difficult
to slide the bottom envelope blank from the feed pile, and
positively position the envelope blank on the conveyor line. While
various vacuum mechanisms have been utilized in an attempt to
positively grip envelope blanks, the resistance to sliding friction
on the surface of vacuum drums, etc. is slight, which allows the
blanks to slide or slip on the vacuum drums and become misaligned
in the system.
With respect to scoring mechanisms, the mechanisms previously
utilized are not versatile in that they are difficult to adjust to
form scores that create envelopes of different sizes, and the
scoring blades frequently become misaligned, bowed, or otherwise
incapable of performing the desired function.
With respect to the folding mechanism, the previously utilized
apparatus must be precisely adjusted and controlled to create a
fold on the score line when various sizes of envelopes are
folded.
With respect to the delivery mechanism, a plurality of slotted
discs are normally used to individually receive each envelope
delivered from the folding apparatus and deliver the envelopes
individually to a stacking station. The arrangement is such that
the desired high peripheral speed of the slotted disc frequently
scorches, tears, or creases the envelopes as they are removed from
the slots of the disc.
SUMMARY OF THE INVENTION
Briefly described, the present invention comprises an envelope
folder which functions to fold and stack envelopes at a high speed
and with extreme accuracy. The envelope blanks are positively fed
from a feed stack onto a rotating vacuum drum. A rotary scoring
mechanism is utilized to score each envelope blank. The scoring
mechanism is adjustable so that its scoring blades can be
positioned to score the envelope blanks at virtually any position,
and its structure is such that the scoring blades are supported at
various positions along their respective lengths to prevent bowing
or bending. The folding mechanism includes a pair of rollers
normally engaging each other for receiving the envelope blanks
therebetween. The rollers positively drive each envelope blank
toward a holding mechanism and then release the envelope blank so
that the holding mechanism maintains the envelope blank in a
predetermined position, whereupon one of the rollers grasps the
flap of the envelope blank adjacent the score line of the blank and
pulls it in a direction generally normal to the flat plane of the
blank to fold the blank at its score line. The delivery mechanism
includes a plurality of slotted discs for individually receiving
each envelope blank from the folding apparatus. The slots of the
disc are curved inwardly of the periphery of the discs, and an
endless belt extends around the axle of the discs and beyond the
perimeter of the discs. The endless belt is driven at a speed which
corresponds to the effective outward movement of the slots of the
discs as the slots pass a stationary plane, so that the leading
edge of each envelope does not bind, tear or crease as it is
extracted from the slotted discs.
Thus, it is an object of this invention to provide an envelope
folder which is economical to construct and operate, which is
highly effective and accurate in folding and stacking envelopes,
and which does not jam or otherwise malfunction in its
operation.
Another object of this invention is to provide a feeding mechanism
for positively feeding envelope blanks from a feed pile into a
scoring and folding mechanism.
Another object of this invention is to provide a scoring mechanism
which is durable, and which is adjustable to form various scoring
arrangements on envelope blanks.
Another object of this invention is to provide a folding mechanism
which functions to fold the flaps of envelopes on the previously
created score line in spite of misalignment of the envelopes in the
folding mechanism.
Another object of this invention is to provide a delivery mechanism
for delivering envelopes from a folding apparatus which functions
to deliver and stack envelopes without danger of tearing,
scorching, creasing or otherwise damaging the envelopes.
Other objects, features and advantages of the present invention
will become apparent upon reading the following specification, when
taken in conjunction with the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a schematic side view of the envelope folder.
FIG. 2 is a side view, in cross section, of the receiving drum, and
the manner in which the chain of the aligning conveyor cooperates
with the receiving drum.
FIG. 3 is a partial front view of the envelope blank feed
mechanism, and the aligning conveyor.
FIG. 4 is a partial side view of the envelope blank feed mechanism
and the aligning conveyor.
FIG. 4a is a bottom view of the separator discs of the feed
mechanism.
FIG. 5 is a partial top view of the scorer.
FIG. 6 is an end view, in cross section, taken along lines 6-6 of
FIG. 5, of the scorer.
FIG. 7 is an end view, in cross section, taken along lines 7-7 of
FIG. 5, of the scorer.
FIG. 8 is a detail showing of an arcuate scoring blade
assembly.
FIG. 9 is an exploded perspective view of an arcuate scoring blade
assembly.
FIG. 10 is a partial side elevational view of the envelope flap
folding mechanism and the delivery mechanism.
FIG. 11 is a partial top plan view of the delivery mechanism.
FIG. 12--17 are schematic showings of the feeding mechanism,
showing the sequence in which the mechanism operates.
FIGS. 18--20 are schematic showings of the folding and delivery
mechanism, showing the sequence in which the mechanism
operates.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now particularly to the drawing, in which like numerals
indicate like parts throughout the several views, FIG. 1 shows
envelope folder 21 which includes feed mechanism 22, aligning
conveyor 24, scoring mechanism 25, end flaps folder 26, glue
applicator 28, bottom flap folder 29, top flap folder 30, transfer
drum 31, and delivery mechanism 32.
As is shown in FIGS. 3 and 4, feed mechanism 22 comprises suction
arm 34, separating arm 35, retaining arm 36, a pair of rotary discs
38, and feeding drum 39. Suction arm 34 has nozzle 40 attached to
one of its ends, and the other of its ends is rigidly held in
mounting block 41. Mounting block 41 is rigidly connected to
oscillating rod 42, and flexible conduit 44 communicates with
suction arm 34 and with a source of vacuum (not shown). Cam
follower 45 is also connected to oscillating rod 42, and cam disc
46 engages cam follower 45. Cam disc 46 is rigidly connected to
rotatable cam shaft 48. Thus, rotation of cam shaft 48 by a driving
means (not shown) causes cam disc 46 to rotate, and its cam surface
functions to oscillate cam follower 45 and oscillating rod 42.
Mounting block 41 thus oscillates to move suction arm 34 in the
direction as indicated by arrow 49 (FIG. 4).
As is shown in FIGS. 4 and 4a, rotary discs 38 are mounted on drive
shafts 50 above feeding drum 39 and move in the directions as
indicated by arrows 51. A feeding stack of envelope blanks 52 is
partially supported by discs 38. Each disc 38 is broken along its
periphery at 54, and the advancing edge 55 of the break in each
disc 38 functions to help separate the bottom envelope from the
feed pile 52 during the movement of discs 38. The envelopes
comprise the usual body portion 56, end flaps 58, bottom flap 59,
and sealing flap 60. Bottom flap 59 is left exposed by disc 38, and
suction arm 34 is movable up to a position adjacent discs 38 into
engagement with the bottom flap 59 of the bottom envelope of
feeding stack 52. Thus, the vacuum source communicates through
suction arm 34 to bottom flap 59 of bottom envelope 61.
Separating arm 35 includes rocker arm 62 connected intermediate its
ends by pivot pin 63 to cam follower arm 64. Cam follower arm 64 is
pivotally connected to rod 65, and follows the surface of cam disc
66. Rocker arm 62 includes a curved cam surface 68 which extends
toward and beneath oscillating rod 42. The other end of rocker arm
62 extends toward feeding drum 39 and includes separating tongue 69
and rollers 70. Tongue 69 extends upwardly and generally about the
surface of feeding drum 39, while rollers 70 extend beyond the end
of separating arm 35 and are movable into rolling engagement with
feeding drum 39. Tongue 69 is pointed and thus maneuverable between
bottom envelope blank 61 and feeding stack 52. The cam surface 68
of rocker arm 62 is held in engagement with oscillating rod 42 by
means of tension spring 71, while tongue 69 is biased toward the
position as shown in FIG. 4 by tension spring 72.
Retaining arm 36 is movable toward and away from feeding stack 52
by means of cam follower arm 74. Cam follower arm 74 is similar to
cam follower arm 64, in that it is L-shaped and pivotal about shaft
65. Cam follower arm 74 follows the surface of cam disc 75.
Retaining arm 36 includes retaining hook 76 adjacent feeding stack
52. With the movement of retaining arm 36 by the action of its cam
disc 75, retaining hook 76 is repeatedly moved toward and away from
feeding stack 52, to intermittently support the bottom flap 59 of
the bottom envelope 61 of feeding stack 52, and to withdraw from
feeding stack 52 to allow suction arm 34 to grasp the bottom
envelope 61 and move it away from feeding stack 52.
Feeding drum 39 is rotatably supported beneath feeding stack 52 and
movable in the direction as indicated by arrow 78. A plurality of
apertures 79 extend through the surface of feeding drum 39. A
vacuum is drawn within feeding drum 39, so that air would normally
flow from the outside to the inside of the feeding drum. A valve
system is utilized with feeding drum 39 so that a vacuum is exerted
within feeding drum 39 as its apertures 79 travel through the arc
indicated as a.
Aligning conveyor 24 is placed with its upper horizontal flight 80
positioned beneath feeding drum 39 and extending toward the
remaining elements of the envelope folder. Aligning pins 82 are
positioned at spaced intervals along each chain of conveyor 80. As
is shown in FIGS. 2 and 3, feeding drum 39 defines spaced grooves
84 in its surface, and aligning pins 82 of the chains of conveyor
80 extend up into grooves 84 as they pass beneath feeding drum
39.
As is shown in FIG. 5, scoring mechanism 25 includes scorer 85
which comprises shaft 86, crescent-shaped scoring blade assemblies
88 and 89, fixed rectilinear scoring blade assembly 90 and movable
rectilinear scoring blade assembly 91. As is shown in FIGS. 6, 7
and 9, crescent-shaped scoring blade assemblies 88 and 89 each
comprises support sleeve 92 which is contractable by means of its
split ring arrangement 94 into gripping relationship with shaft 86.
Mounting flange 95 extends radially outwardly from sleeve 92, and
boss 96 protrudes laterally from mounting flange 95. Aperture 98 is
defined in mounting flange 95 a distance spaced from boss 96. A
pair of crescent-shaped scoring blades 99 and 100 are connected to
mounting flange 95. Blade 99 includes a pair of spaced apertures
101 and 102 which are alignable with aperture 98 and the aperture
of boss 96 of mounting flange 95. Scoring blade 100 defines
elongate arcuate slot 104 which is positionable adjacent aperture
98 of mounting flange 95, and indentation 105 which is slidable
into abutting relationship with boss 96. Scoring blades 99 and 100
includes beveled cutting edges 106 and 107. As is shown in FIG. 8,
beveled sharpened edge 106 of scoring blade 99 is tapered toward
scoring blade 100 while beveled sharpened edge 107 of scoring blade
100 is tapered toward blade 99. With this arrangement, a
substantially continuous cutting edge is provided by scoring blades
99 and 100, whether these blades are in complete overlapping
relationship, or whether scoring blade 100 is extended beyond the
limits of scoring blade 99. Scoring blades 99 and 100 are connected
to mounting flange 95 by appropriate bolts 109 and 110. Scoring
blade 100 is of a thickness of approximately equal to the length of
boss 96, so that boss 96 functions to hold scoring blade 99 spaced
from mounting flange 95. Because of slot 104, scoring blade 100 is
movable radially about sleeve 92 of crescent-shaped scoring blade
assembly 88. of course, once scoring blade 100 is properly
positioned, its bolts 109 and 110 can be tightened to retain
scoring blade 100 in a fixed position.
As is shown in FIG. 5, fixed rectilinear scoring blade assembly 90
includes support bar 111 which is maintained in spaced relationship
from shaft 86 by means of support blocks 112 and 114. Connecting
screws 115 extend through the ends of support bar 111 and through
support block 112 and 114 into shaft 86 to rigidly connect support
bar 111 to shaft 86. Scoring blade 116 is connected to support bar
111 by means of threaded screws (not shown). The sharpened edge 118
of scoring blade 116 extends slightly beyond the arcuate outer
surface of support bar 111. The edges 106 and 107 of
crescent-shaped scoring blades 99 and 100 extend outwardly from
shaft 86 a distance equal to the extension of the edge of scoring
blade 116.
As is shown in FIG. 6 movable rectilinear scoring blade assembly 91
includes support bar 120 supported at its ends by sleeves 121 and
122. The split ring arrangement 124 of sleeves 121 and 122 allows
the sleeves to be contracted into frictional engagement with shaft
86, to fixedly connect support bar 120 to shaft 86. Rectilinear
scoring blade 126 is connected to support bar 120 by means of
screws (not shown), in such a manner that its sharpened edge 128
extends out a distance equal to the extension of the cutting edges
of scoring blades 106, and 107, and 118.
Support sleeves 92 of crescent-shaped scoring blades assemblies 88
and 89 engage the bottom surface of support bar 111 of fixed
rectilinear scoring blade assembly 90 and engage the bottom surface
of support bar 120 of movable rectilinear scoring blade assembly
91. Also, support sleeves 121 and 122 of movable rectilinear
scoring blade assembly 91 extends outwardly from shaft 86 a
distance sufficient to engage the bottom surface of support bar 111
of fixed rectilinear scoring blade assembly 90. Thus, support bar
111 is supported at six places along its length: at its ends by
support blocks 112 and 114; by support sleeves 121 and 122; and by
the support sleeves 92 of crescent-shaped scoring blade assemblies
88 and 89. Thus, the tendency of support bars 111 and 120 to bow or
otherwise bend, is virtually eliminated.
As is shown in FIG. 10, top flap folder 30 includes vacuum roller
130, pressure roller 131, and holding bracket 132. Vacuum roller
130 includes a line of apertures 134 extending through its surface,
so that the vacuum applied to the inside of vacuum roller 130 draws
air through apertures 134. Vacuum roller 130 rotates in the
direction as indicated by arrow 135, and a valve mechanism (not
shown) is associated with vacuum roller 130 so that a vacuum is
applied to vacuum 130 as its apertures 134 passed through arc b on
every fourth revolution. Pressure roller 131 is normally in rolling
contact with vacuum roller 130, and rotates in the direction as
indicated by arrow 136. The surface of pressure roller 131 is
slotted at 138, so that when slot 138 passes vacuum roller 130 the
contact between vacuum roller 130 and pressure roller 131 will be
relieved. Holding bracket 132 includes arcuate guide plate 139,
arcuate biasing plate 140 and adjustable stop 141. The opening
between guide plate 139 and biasing plate 140 is extended toward
the line of contact between vacuum roller 130 and pressure roller
131 to receive envelopes passing between the rollers in the slot
142 defined between guide plate 139 and biasing plate 140.
Transfer drum 144 is positioned adjacent vacuum roller 130 and
rotatable in the direction as indicated by arrow 145. Transfer drum
144 defines a plurality of holes or apertures 146 and 147 on
opposite sides thereof, and a valving mechanism (not shown)
functions to create a vacuum within drum 144 as apertures 146 and
147 pass through arc c.
Delivery mechanism 32 includes a plurality of spaced slotted discs
149 rotatably mounted on axle 150. Discs 149 rotate in the
direction as indicated by arrow 151, and include a series of spaced
arcuate slots 152 which extend inwardly and forwardly from their
peripheries. Slots 152 are progressively curved inwardly of each
disc 149. Endless belts 154 extend around sheaves 155 which are
rigidly connected to and driven by axle 150. Belt 154 also idles
around shaft 156. Sheave 155 is chosen so that its tangential
component of velocity, and thus the linear velocity of belt 154, is
equal to the effective linear velocity of arcuate slots 152 as they
pass the stationary plane of upper flight 158 of belt 154. With
this arrangement, when a slot 152 intersects the plane of upper
flight 158 of belt 154, the point of intersection on flight 158
will travel toward axle 158 of a linear velocity generally equal to
the effective linear velocity of the travel of the arcuate slot 152
toward axle 156. Thus, any envelope present in an arcuate slot 152
will be urged outwardly of the arcuate slot by upper flight 158 of
belt 154 without encountering any binding, shearing or drag forces
by the surface of belt 154.
Endless belt 160 extends across platform 161, and about
intermediate driven sheave 162. The envelopes extracted from
slotted discs 149 by endless belt 154 will naturally stack in a
vertical arrangement on belt 160 and platform 161. The intermittent
drive of sheave 162 and its belt 160 is imparted to shaft 156 by
means of gear 164 surrounding shaft 156, and pawl 165 engaging gear
164. Pawl 165 is reciprocated by means of cam 166 mounted on shaft
150. The intermittent movement of belt 160 functions to move the
stack of envelopes away from slotted discs 149, to create a space
for the receipt of additional envelopes from delivery mechanism
32.
OPERATION
When the envelope folder is in operation a stack of envelope blanks
will be positioned on rotary discs 138 (FIGS. 4 and 4a) to form a
feeding stack. When the apparatus is energized, rotary discs 38 and
suction arm 34 function to separate bottom envelope blank 61 from
the feeding stack 52. As is shown in the sequence of FIGS. 12--17,
suction arm 34 moves against the bottom flap of bottom envelope
blank 61, its vacuum is applied to the bottom envelope blank, and
suction arm 34 is then moved in a downward direction (FIG. 13).
Separating arm 35 then moves to a position so that its tongue 69
protrudes into the space between bottom envelope 61 and feeding
stack 52, The movement of separating arm 35 as controlled by its
cam surface 68 (FIG. 4) is such that tongue 69 moves generally
parallel to the surfaces of the envelopes in the feeding stack 52
until it enters the spaced between bottom envelope 61 and feeding
stack 52, whereupon it begins its downward movement toward feeding
drum 39. As separating arm 35 gets closer to feeding drum 39,
rollers 70 extend over the surface of bottom envelope 61, so that
as rollers 70 engage feeding drum 39, bottom envelope 61 will be
inserted between feeding drum 39 and rollers 70. The apertures 79
of feeding drum 39 will then allow the vacuum within feeding drum
39 to be applied to bottom envelope 61. Thus, the vacuum applied to
the envelope and the pressure applied to the envelope by rollers 31
will function to positively connect bottom envelope 61 to feeding
drum 39, whereupon bottom envelope 61 will be completely withdrawn
from feeding stack 52 and carried around the bottom of feeding drum
39 toward aligning conveyor 24 (FIG. 16).
As the leading edge of envelope 61 is extended substantially
parallel to the upper flight 80 of conveyor 24, the vacuum applied
to the envelope blank will be released, and conveyor 24 will
function to carry the envelope blank in a direction as indicated by
arrow 81. To insure that the envelope is perfectly aligned for
further processing through the envelope folder, aligning pins 82
engage the trailing edge of the envelope blank to push the envelope
blank toward the next station in the envelope folder, which is the
station where the scoring mechanism 25 functions to create scores
in the envelope blank.
As is shown in FIG. 1, the envelope blanks are successively
processed through scoring mechanism 25, end flap folder 26, glue
applicator 28, bottom flap folder 29, and sealing flap folder 30.
As is shown in FIGS. 18--20, the envelope 61 reaches top flap
folder 50 with its body portion 56 leading its sealing flap portion
60. As the body portion 56 passes between vacuum roller 130 and
pressure roller 131, the body portion 56 is positively driven into
holding bracket 132. As the score line of envelope 61 passes
between vacuum roller 130 and pressure roller 131, slot 138 of
pressure roller 131 functions to relieve contact between vacuum
roller 130 and pressure roller 131 to release envelope 61. The
vacuum within vacuum roller 130 is applied through its apertures
134, whereupon vacuum roller 130 is effective to grasp sealing flap
60 and simultaneously fold sealing flap 60 on its score line and
move envelope 61 in a downward direction and out of holding bracket
132. Vacuum roller 130 functions to carry envelope 61 into
engagement with transfer drum 31, whereupon openings 146 of
transfer drum 31 function to grasp the body portion 56 of envelope
61 and carry envelope 61 toward delivery mechanism 32. As the
envelope passes around the bottom of transfer drum 31, the vacuum
exerted on the body portion 56 of the envelope is relieved and the
envelopes are thrust into the slots 152 of slotted discs 149.
Slotted discs 149 rotate in the direction as indicated by arrow
151, toward endless belt 160. As each slot passes upper flight 158
of endless belt 154, it is urged outwardly of its slot. The
movement of upper flight 158 of belt 154 is timed so that it moves
at a linear velocity equal to the effective outwardly linear
velocity of the movement of each arcuate slot 152 as it passes belt
154. Thus, the bottom edge of each envelope will be urged outwardly
of its respective slot 152 at a linear rate so that no cutting,
binding, scorching or drag will be felt by the bottom edge of the
envelopes. As the envelopes are removed from their respective slots
152 they are stacked on endless belt 160. As the envelopes
accumulate on endless belt 160, the endless belt is driven
intermittently to create more space for the next envelopes.
At this point it should be apparent that the disclosed invention
provides a positive feed mechanism for extracting envelopes from a
feed pile of envelopes, a unique aligning mechanism for positively
aligning the envelopes for subsequent scoring and folding, a
versatile scoring mechanism which adapts virtually to any
rectangular scoring arrangement and which resist wear and
deterioration, a top flap folding mechanism which functions to fold
a sealing flap of an envelope on its score line regardless of any
improper misalignment or other similar malfunction of the
apparatus, and a delivery mechanism which functions to deliver
envelopes and stack envelopes without danger of scorching,
creasing, tearing or otherwise damaging the envelopes.
It will be obvious to those skilled in the art that many variations
may be made in the embodiments chosen for the purpose of
illustrating the present invention without departing from the scope
thereof as defined by the appended claims.
* * * * *