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Патент USA US3054444

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Sept. 18, 1962
E. LAXO
3,054,437
CAN BODY BLANK FORMING MACHINE
Filed Jan. 29, 1960
5 Sheets-Sheet 1
R
INVENTOR.
£0 L4X0
“W W2?
477021/5)’
Sept. 18, 1962
3,054,437
E. LAXO
CAN BODY BLANK FORMING MACHINE
3 Sheets-Sheet 2
Filed Jan. 29, 1960
INVENTOR.
W
E0 L4X0
BY
gw??jy
47 TTOEA/EY
Sept. 18, 1962
E. LAXO
3,054,437
_
CAN BODY BLANK FORMING MACHINE
Filed Jan. 29, 1960
5 Sheets-Sheet 3
FILTIL
3,)
77%
INVENTOR.
ED LAXO
BY
A TTOENE Y
Unite
tates
5 atet
1C6
3,054,437
Patented Sept. 18, 1962
1
2
3,054,437
Ed Laxo, 27690 Orlando Ave, Hayward, Calif.
One form of the invention is shown by way of example
in the accompanying drawings, in which:
FIGURE‘I is a view partly in vertical section and partly
in side elevation of the machine of the present invention
CAN BODY BLANK FORMING MACHINE
Filed Jan. 29, 1960, Ser. No. 5,383
4 Claims. (Cl. 153-25)
as embodied in a can body blank folding or hook forming
machine.
This invention relates to a hook forming or folding
machine for forming hooks on or folding the edges of
FIGURE 2 is a section taken along the line 2—2 of
‘FIGURE 1.
can body blanks. The hooks so formed are intended
FIGURE 3 is a side view of the machine as seen from
to interlock to form the side seam of a tubular can 10 the right of FIGURE 1 but with certain parts removed.
body. The machine also has equal application to a
FIGURE 4 is a top plan view as seen from above
notching and slitting operation wherein can body blanks
FIGURE 1.
are notched and slit for purposes of clearance at the
Referring now to the drawings and more particularly
junction of the side seam of a can body and the double
to FIGURE 1, the machine is generally designated by the
end seam which is formed when an end or cover is ap 15 reference numeral 10. It comprises a frame 11, a left
plied to a can body. The hook forming or folding opera
hand hook forming ‘or folder assembly 12a, ‘and a right
tion referred to is well known in the can making art and
hand hook forming or folder assembly 12b. These as
is illustrated in my prior Patent No. 2,569,181 granted
September 25, 1951, entitled “Can Body Blank Hook
Forming Apparatus.” The notching and slitting opera
tion referred to is also well known in the can making art
and is illustrated in my prior Patent No. 2,577,021,
vgranted December 4, 1951, entitled “Apparatus for Notch
ing Can Body Blanks.”
This application is a continuation-in-part of my co
pending application Serial No. 670,483 entitled “Can
Body Blank Forming Machine,” ?led July 8, 1957 and
now abandoned.
‘For convenience and brevity, the description herein
semblies are referred to hereinafter as folder assemblies.
The view shown in FIGURE 1 is looking “upstream,”
that is, in the direction from which can body blanks come
to the machine. The “left-hand” and “right-hand” des
ignations employed, although reversed in FIGURE 1,
refer to the right and left-hand directions as they would
be seen from the input or “upstream” end looking toward
the “downstream” end of the machine.
Operation of the folder assemblies 12a and 12b is
identical except that the hooks are formed downwardly
by the left-hand assembly ‘12a and upwardly by the right
hand assembly 12b.
after will ‘be directed mainly to a hook forming opera 3O
A feed table is provided at 11a and a can body blank
tion and apparatus.
is shown at 13. A slide 14 is provided which is slideably
‘In the past, can body blank hook forming or folding
mounted in the frame 11 by the means described here
machines and can body blank notching and slitting ma
inafter. The slide 14 is actuated by any suitable means,
chines have employed slides for the purpose of actuating
such as a crankshaft (not shown) and a connecting rod
the hook forming or folding tools and punches. In the 35 15 which is pivotally connected to the slide at 16. The
past the slides have had to be set with a ‘0.002 or 0.003
same crankshaft may be employed to operate syn
inch clearance, otherwise they will gall or score. But
chronously other parts of a can body blank forming as
with a clearance of this magnitude another di?‘iculty de
sembly, such as notching and slitting machines (not
velops, particularly in a notching and slitting machine.
shown).
Thus in the latter a play of 0.002 to 0.003 inch frequently 40
Referring now to FIGURES l, 3 and 4, the slide 14
results in cuts which are not clean and sharp. Similar
is formed on opposite sides (i.e., to left and right as viewed
di?iculties are experienced with hook forming machines.
in FIGURE 3) with vertical V-shaped grooves 17 which
To avoid these difficulties a rocker type of mounting
mate With similar grooves 18 formed in gibs 19 and 20.
has been employed instead of a slide mounting. A
These grooves are shown best in FIGURE 4. Referring
rocker mounting overcomes the dif?cultiy of excessive 45 to FIGURE 3, the gib 20 is shown adjacent a similar
play and it is easy to lubricate but it is di?icult to adjust
gib 2011 which performs a similar function for an adja~
with the desired degree of precision.
cent notching and slitting machine (not shown). Cap
It is an object of the present invention to provide an
screws 25 clamp the gibs 20 and 20a in place. Cap
improved means for mounting the folding or hook form
screws 25a are also provided for the left-hand gib 19
ing elements of the folder station of a can body form 50 but they pass through elongated slots 26 formed in the
ing machine and for mounting the punches of the notch
ing and slitting station of a can body forming machine.
It is a particular object of the invention to provide
gib 19 to permit adjustment thereof. Adjustment is ac
complished by means of set screws 27. As is best shown
in FIGURE 4, each set screw 27 has a tapered inner end
a means whereby the folder steels of a body blank hook
which is wedged between the gib 19 and the frame.
forming machine and the punches of a can body blank 55 Therefore by screwing the set screws 27 farther in, the
gib 19 is pushed toward the slide 14.
notching and slitting machine are operated by a slide
As will be seen in FIGURES 3 and 4, hardened steel
mechanism, such slide mechanism being of a character
ballbearings 28 are located in the vertical passages formed
that it is easily lubricated, that it does not gall and score
by the V-grooves 17 and 18. The ballbearings 28 are
easily, that it can be adjusted readily and with precision
and that it can be set to a very close tolerance.
60 seated in holes 29a ‘formed in retainer plates 29. When
the set screws 27 have been adjusted so that the slide \14
A still further object of the invention is to provide
a machine of the character and for the purpose described
in which the slide element is readily adjusted to the proper
has a snug ?t, the cap screws 25a are tightened to clamp the
degree of tightness Without, however, interfering with high
that there are no top or bottom supports for the retainer
slide ‘14 securely in adjusted position. It will be noted
speed operation, and which permits close metal-to-metal 65 plates 29. These are held by the ballbearings 28 which in
turn are held by pressure of the gibs 19 and 20 and the
slide 14. To the extent that the balls 28 move up and
down with the slide the retainer plates 29 also move up
and down but their movement is limited and they do not
tend to work out at the top or drop out at the bottom.
70
parent from the ensuing description and the appended
The ballbearing mounting just described and illustrated
contact without the need for thick ?lms of lubricants.
Yet another object is to provide an improved mounting
for the folder steels of a hook forming machine.
These and other objects of the invention will be ap
claims.
in the drawings is very advantageous. It provides anti
3,054,437
3
friction means of a mechanical character.
Also means
downs during operation are reduced to a minimum. High
speed, efficient operation is obtained and servicing such
as lubrication and periodic adjustments are greatly'facili
~
.
_
_
‘a
_\
thereby folding the 90° hook through a further angle of
60°, corresponding to the angle of the lip or overhang 45
of the stationary folder steel 44.
The above described rocking motion of the holder 49
compresses the’ spring 60. Therefore, when the slide 14
commences its up stroke the spring 60, acts to rock the
holder 49 back toward its normal vertical position, there
by clearing the lip 47 from the lip 45 and permitting return
lubrication. A slide of this character is capable of oper
ating at high speed over. long periods of time. Break
.
~
I holder v49 in clockwise direction as viewed in FIGURE 1
are provided to form a tight ?t, without too much play
or too much tightness. Adequate access is provided for
tated.
,
-
'
The mounting thus described and illustrated is particu 10 of the holder 49 to its up position.
Referring to the left-hand side of FIGURE 1, i.e., the
larly advantageous in the case of a matching and slitting
right-hand folding assembly 12b, it will be seen that the
machine. As explained above precise adjustment is de
construction and operation are substantially the same as
sirable in the case of a notching and slitting machine.
the construction and operation of the left-hand folder as
In a rocker type, precise adjustment is di?icult. In pre
vious slide mountings lubrication difficulties have been 15 sembly 12a. However, as will be seen, the holder 49 is
encountered. By means of my ballbearing slide mounting, '
held in elevated position by the respective spring 60; i.e., it
precise adjustment is permissible, lubrication is easy and
does not hang like the right-hand holder 49. Also, the
“stationary” folder steel 44 is mounted on the clamp 30
and the guide steel 30a is mounted on the frame 11. The
Reverting now to the folding operation, just before a
can body is folded it must be clamped to the feed table, 20 movable folder steel 46 moves up to form a 90'' bend
and then in to form a 60° bend’. '
'
which is indicated by the reference numeral 11a. This
It will be apparent that the slide mechanism illustrated
is accomplished by a'clamp 30 on a rocker 31 which is
in the drawings and described hereinabove has equal appli
pivoted on the frame Heat 32. Extension 31a of rocker
cation to and has special advantages with a notching and
31 carries a cam follower roller 33 which rides on a cam
34 which is clamped to the slide 14 by gibs 35 and cap 25 slitting operation. Thus, in place of’ the movable folder
steels 46, punches would'be employed and in place, of the
screws 36, (see FIGURES 3 and 4); The cam 34 has a
stationary folder steels 44, cooperable female dies would
low dwell 4!),v a rise 41 and a high dwell 42. When the
be employed. Also, it is not necessary in the case of
slide .14. starts to descend'the roller 33 rides up the rise
notching and slitting punches, to mount them on a pivotal
41 onto the high dwell 42 which pivots'the rocker ex
.tension 31a, rocker 31 and clamp 30 in counterclockwise 30 holder, such as the holder '49; The punches may be ?xed
onlya very thin film of lubricant need be maintained. ’
direction as viewed in FIGURE 1, thereby effectively
clamping the can body blank 13 to the feed tablerlla.
The cam 34 is adjusted by, loosening the ',cap screws
36, moving the cam vertically to the desired position and
then tightening the cap screws. 7
‘
>
in relation to the slide 14.
I
.
a
d
It will, therefore, be apparent that a machine has been
provided which is capable of forming hooks on can body
' blanks, also of'eform'ing s’lits and notches in can body
e
The folding or hook forming tools comprise a stationary
folder steel 44 which is ?xed to the frame 11 and'which
blanks, such machine being capable of operating at high
speed and having'advantages such as easy accessibility,
ease of lubrication, ease and precision of adjustment,
has an upper, plane horizontal surface 11b, which is ?ush K ‘
and dependable operation at high speed over extended
with and is an extension of the feed table 11a. It also
periods of time.
'
V _
V
.
a
has a projecting or overhanging ‘lip 45 whose undersurface 40
has a 30° slant from the horizontal. The other folding or
1. A can body blank forming machine of the charac
hook forming tool is a movable member which is'carried
'ter described comprising: a longitudinally extended hori
vzontal feed table having parallel edges extending. along
by the slide 14., This movable folding tool is the folder
steel 46. As will be apparent, it likewise hasan over:
its length and at least one work station located along
I
claim:
a
.
i
'
V
'
' hanging lip 47 whose upper surface has a slant, which is 45 said table intermediate its ends, said workstation com
shown at'48, of 30° from the horizontal. A steel insert
30a ?xed to the clamp 30 serves as a gauge and guide for
the lip 47 during a portion of its down stroke. 7 _,
As stated, the movable folder steel 46 is carried by the
vslide 14. ' More speci?cally the folder steel is mounted in
pendulum fashion from the slide 14 by a holder 49 which
is pivotally mounted by a shaft 50 which is journaled'in
extensions or bosses 51 (see FIGURE 4) formed on and
‘projecting inwardly from the top of the slide 14. ‘The
prising; a stationary frame, a slide, means mounting said
slide for vertical, {reciprocating movement in said frame
and a tool carried by said slide for performing a metal
forming operation .on an edge ofa can body, blank closely
adjacent one of said edges of the table, suchoperation
being performedat high speed and solely on such edge
of the body blank and‘ with the tool moving closelyrad
'jacent thertable, said mounting means being in the form
vof a notched portion of each side, ofsaid slide, an op
holder 49 is cored out at 55 to receive the’ head of a bolt 55 posed registering notched portion of said frame on each
56 which extends through a passage 57 in the holder 49
side of the slide, and a plurality of ball bearings seated
and a passage'58 in the slide 14. ' A boss 59_on>the holder
49 abuts the adjacent vertical face of the slide 14 to limit
swinging of the holder ‘49 to the right (as viewed in FIG
. iURErl) and to normally locate the holder in vertical po
sition, in which it isheld by a coiled spring 60 which is
located in an enlarged portion ofrpassage '58. The spring
within each pair. of opposed registering notches;
2. .The machine .of claim 1 wherein said notches. are
V-shaped incross section.
_.
.
_
.
V,
_
V
j
.
>
3. The machine of claim‘ 1 inc‘ludinga cage for each
set of, ball bearings, each said cage being in therform of
a plate with a row of holes extending therethrough, said
60 is compressed by a washer 61 and nut 62 and is locked
bearings being seated, in said holes. 7
.
in places by a lock'nut 63. It will, therefore, be seen that
4. The machine of claim 1 wherein said tool is a fold
the holder 49'and movable’ folder steel 46 are normally. 65 ing tool for vfolding a projecting edge of a can body blank
held in vertical position. Hence, as the slide 14 moves
into a hook adapted to form a can body side seam.
down the lip 47 on the movable folder steel 46 will bend
the adjacent, overhanging edge of the can body blank 13
and vwill turn it downwardly at a 90° angle.
A rocker cam 65 is formed on the lower end of the 70
holder 49. The rocker cam 65 is intended to engage a’
' References Cited in the ?le of this patent
.
. f UNITED STATES PATENTS
1,846,019
Bangser. ________ _-__-___'_,_ Feb. 23, 1932
roller. 66 which, is mounted on the frame of the machine
‘and is.best shown in. FIGURE .2. Such engagement
r 2,429,169.
, 2,565,687
Pearson et a1. _;..._:____V___.. Oct.'14,'l947
'Hoier ___._‘__V____.‘__,____'_. Aug. 28, 1951
occurs before the slide 14 reaches the limit of its down
stroke, and the roller 66 acts on the cam 65 to rock the 75
~ 2,626,540.
-Eserkaln '. _____ __; ____ __'_ Jan. 27, 1953
Laxo ________ _;. ______ ..._ Dec. 13, 1955
2,726,702
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