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Патент USA US3026663

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March 27, 1962
B. DE ZORDO
'
3,026,653
AUTOMATIC MACHINE FOR LAPPING OF MARBLE
SLABS AND OTHER SIMILAR STONES
Filed 001;. so, 1959
Y
5 Sheets-Sheet 1
March 27, 1962
B. DE ZORDO
‘ 3,026,653
AUTOMATIC MACHINE FOR LAPPING OF MARBLE
SLABS AND OTHER slMILAR STONES
Filed Oct. 60, 1959
s sheets-sheet 2 -
INVENTOR‘
BY
66 M '
3,@Z?,?53
a
United States Patent
$6
Patented Mar. 27, 1952
2
1
the ones 212 which control the reciprocating motion of
carriage 210. The abrasive tools 30a and equipment 30
3,026,653
AUTQMATHI MACHINE FOR LAPPKNG 0F MAR
BLE SLABS AND OTHER SIMHLAR STONES
Battista De Zordo, Bergamo, Itaiy (% lug. A.
Giambrocono, Via Durini 4, Milan, Italy)
Filed Oct. 30, 195?, Ser. No. 849,897
Claims priority, application Italy Nov. 3, 1958
1 Claim. (Cl. 51*56)
may therefore, act on a slab 31 located on a stationary
plane 32.
Carriage it} is associated to a distributing-in~
version member 40 of the motion of motor 12: said
member 49 comprises a commutator lever 41 pivoted in
42 and having a preferably fork shaped arm 41a and a
suitably Shaped arm 41b. Parallel to track 11 a shaft 50
which is rotatably mounted on the machine casing 100
The present invention relates to an automatic machine 10 is provided and it presents at one of its ends a four-lobed
cam 51. A roller 52 is urged in an elastic manner by
for lapping marble slabs and similar stones.
means of any known device between said lobes and
The main object of the present invention is to provide
therefore may ?rmly position shaft 50 correspondingly
an automatic machine for lapping or bu?ing marble slabs
to the number of lobes. Along shaft Sit a plurality of
or other similar stones according to mutually parallel and
perpendicular directions and according to a predeter 15 projections 7% are provided on sleeves 71 which may be
mounted, for example, as indicated in FIG. 2, on shaft
mined program and this in a fully automatic manner
50. That is, said sleeves 71 may be formed by two
after ?nal set-up the machine.
mutually hinged branches 71a and 71b and friction con- '
According to the invention not only a considerable
nectable to shaft 56 by means of a screw 71c, preferably
saving in labour is attained, but also lapping and bu?ing
of said slabs is made possible in a continuous and even 20 shaft 50 presents a longitudinal slot 50a along which
sleeve 71 may slide.
manner.
At the'ends of shaft 59, two projection devices are
mounted, each one having four projections 9t}, pref~
erably longitudinally offset and at 90° apart. One, of
by motor means in a ?rst direction, a second carriage
slidably mounted on said ?rst carriage and connected to 25 said devices being ?xed and the other, preferably ad
According to the invention, the machine is of the type
comprising a first carriage suitable for being displaced
motor means suitable for moving it in a second direction
justably mounted on shaft 50. Parts 91a, 91b, 91c cor
perpendicular to said ?rst direction, said second carriage
being connected to a known type abrasive machine, char
respond to parts 71a, 71b, 710 relating to FIG. 2. Pro
motor means, said second carriage being connected to
a further motion distributing and reversing member for
the respective motor means and by the fact that a shaft
is provided parallel to said ?rst direction connected to
arm 41b this being obtained by suitably proportioning
the length of the projections. Projections 7G‘ by acting
jections 99 act only on arm 41b of lever 41 and projec~
tions 70 act only on arm 41a of fork shaped lever 41.
acterized in that said ?rst carriage is connected to a mo
tion distributing and reversing member for the respective 30 Naturally, it is not possible that projections 7% act on
on arm 41a, allow commutation of electric motor feed
12 and 212 and therefore will be designated as com
the machine casing and provided with means to act on 35 mutating projections, while projections 90 act on arm
41!) of lever 41 thus reversing rotation of motor 12
said first motion distributing member, and a second
and will thus hereinafter be called reversing projections
shaft is provided parallel to said second direction, asso
or stop projections.
ciated with said ?rst carriage, and provided with means
Referring now to FIG. 1 it is noted that a shaft 25%
to act with said second motion distributing and reversing
member.
40 is parallelly mounted to the arrows direction FC-—FD
and rotatably mounted on a couple of brackets 160A,
The above-mentioned and other features as well as
?xed on carriage 10 and thus movable with the latter
the objects and advantages of the invention will clearly
according to the arrows direction FA—FB. At ‘said
result from following description of a preferred embodi
shaft 25d cornmutating projections and reversing stop
ment diagrammatically illustrated in the attached draw
ing, in which:
45 projections similar to the ones speci?ed above are pro
vided. Carriage 210 is also associated to a motion re
FIG. 1 is a perspective and only partial view of the
' versing-distributing member 240 similar to 4d. Thus
machine according to the invention;
the parts similar to the ones previously described have
FIGS. 2 and 3 show two details;
been marked with the same reference numbers preceded
FIGS. 4 and 5 diagrammatically illustrate the possible
paths of movement of the abrasive tools;
50 by number 2.
According to a feature of the invention a coupling device
FIG. 6 shows an electric connection diagram;
is provided between shafts 5t) and 250 so that rotation
FIG. 7 is a perspective detailed view of the distributing
of a shaft permits the rotation of the other. Said de
reversiug member for the electric motors controlling the
vice consists of two props 8t}, 2%‘ respectively connected
two aforementioned carriages.
'
The machine, according to the invention, is of the type 65 to shafts 50 and 25b and of a rod 282 ?tted to carriage
216; said rod 282 has a transversal extension 283 at its
comprising a ?rst carriage 10 which is slidably mounted
end suitable for positively rotating the prop 8t} when car
along tracks 11 of which only one is shown in the draw
riage 210 is displaced in the FD arrow direction and an
ing and is associated, at one of its ends 10a, with an elec
extension 284 suitable for positively rotating prop 28%
tric motor 12. The latter by means of a reduction gear,
not shown, controls a toothed pinion, also not shown, 60 when carriage 210 is displaced in the FB arrow direc
tion. Having described in its essential elements the ma
with a meshing rack 13 provided on track 11. The car
chine structure according to the invention its operation
riage 10 provided with rollers 14, may thus be displaced
according to the FA——FB direction arrows.
The motor
may be schematized as follows.
By referring to diagram of FIG. 4 in the ?rst instance
12 is capable of rotating in two directions as Will better
appear hereinafter. By 210 a second carriage is indi 65 the travel appears identi?ed by section “a.” At the stop
the reversing projection iii} intervenes whereby motor 12
cated movable in the directions of arrows FC——FD,
stops and automatically motor 212 ‘starts determining
which are perpendicular to tracks 11. By 214, 212, 211,
travel b until a porjection 270 acts on member 2% in
213 are indicated elements corresponding to'14, 12, 11,
terrupting feeding of motor 212 and allowing feeding
13 already described in relation to the ?rst carriage.
By 30a lapping equipment of any known type and asso 70 of motor 12; the latter displaces the carriage according
to the PB direction namely it allows the lapping machine
ciated with carriage 210 has been indicated, which is
to travel according to path 0. At the stop (in the PB
obviously controlled by motor means independent from
3,026,653
3
arrow direction) the reversing projection 90 intervenes
of motor 212 and thus the path according to section
roller 63c returns plate 62 and then lever 41 in the po
sition preceding the arm 41a impact with a projection 70.
As far as the feeding circuit of motor 212 is concerned,
“d” and so on automatically for the e, f, g, h, i, l, m
it has to be noted that the same elements as for the
and stops motor 12 and allows at the same time feeding
sections.
5 previous circuit are applicable which have been marked
At the end of the m path the reversing projection
with the same reference numbers preceded by num
290 intervenes whereby lever 241 is in an angularly dis
eral 0.
placed position, the same occurring to lever 41. The
It clearly appears that the reversal of rotation of motor
cycle identi?ed by the interrupted lines is thus newly
12 (212) is obtained by passing contacts 69d from
repeated. At the end of this second cycle rod 282 in
brushes 65a to 660: and vice-versa, this occurs due to
tervenes and rotates shafts 250 and 50 through an angle
reverse projections 90. On the contrary, to pass from
of 90° setting the machine for another automatic travel
feeding of motor 12 ‘to 212 it is su?icient that the nosing
for example the one identi?ed by FIG. 5 and this obvi
63 acts on switch 5 (5a); this occurs due to commutating
ously according to the position and number of projec
tions 270 and 70. Since four angular displacements of
shafts 50, 250 are foreseen, the third and fourth cycle
might be different from the ones in FIGS. 4 and 5 al
ways with the aim of working the slab according to dif~
ferent paths and working slab 31 according to a plu
rality of paths which are repeated automatically and
projections 70. Obviously, the same occurs as far as
motor 212 is concerned.
In fact, for example, as soon as feeding of electro
magnetic switch 7 is interrupted, switch 08' is closed and
thus electromagnetic switch 07 is fed which opens switch
8 and thus it does not allow feeding of electromagnetic
cyclically.
switch 7 even if one of switches 5 is then closed.
Referring now to diagram of FIG. 6 in which elec
trical connections of motors 12 and 212 (three-phase)
motors 12 (‘212) is not possible in any way and a correct
It is apparent however, that simultaneous feeding of
operation of the machine is thus ensured.
Iclaim:
tive and partial view member 40. Lever 41 is connected 25
An automatic machine for lapping of marble slabs and
to an insulating part 37 in which are buried three rings
the like comprising a ?rst carriage mounted to be dis
60a, 60b, 600, only one of which 66a is seen in FIG. 6.
placed by ?rst motor means in a ?rst direction, a second
As appears from the drawing, each ring 60a, 63b, 69c
carriage mounted sliding on said ?rst carriage, and associ
presents a contact projection 600'. In addition, said in
ated to second motor means able to displace it in a
sulating block is combined with a slab 62 having a nosing
second direction perpendicular to said ?rst direction,
63 which operation of will be hereinafter described.
said second carriage being associated to an abrasive
Three thin columns 64, 65, 66 are provided; of which
machine of known type, the said ?rst carriage being con
the 64 one bears three brushes 64a; the 65 one bears three
nected to a motion distributing-reversing member of
brushes 65a; the 66 one bears three brushes 66a. Said
the said ?rst motor means, said second carriage being
brushes are partially seen in FIG. 7. The three 64a
combined with a further motion distributing-reversing
are indicated, as well as FIG. 7 which shows in perspec
brushes are connected to a branch “A” of the “E” feed
line while brushes 65a, and 66a are connected by a three
wire cable 67 to which a cable 63 is branched thus feed
ing motor 12. Cable 67 connects said brushes in such
member of the said second motor means, a ?rst shaft
being provided parallel to said ?rst direction connected
to the machine casing and provided with means to act
correspondingly to said motion distributing-?rst member
a way that the motor turns in one direction or in the 40 and a second shaft being provided parallel to said second
the opposite direction according to the feed from 64a——
66a brushes or from 64a—65a brushes. A transformer
69 may feed under control of switch 8 an electro
direction, connected to said ?rst carriage and provided
with means able to act correspondingly the said motion
distributing-reversing second member, said ?rst and sec
magnetic switch 7 which allows feeding of 64a brushes.
Said electromagnetic switch 7 additionally controls a 45 ond shaft being kinematically connected to one another
so as that the rotation of one causes the rotation of the
switch 08 which controls feeding of a second electro
other for a preestablished rotation angle due to the
magnetic switch 07 similar to switch 7. In series to
displacement of said second carriage.
the feeding conductor of the electromagnetic switch 7
two switches are provided 5, 5a, the opening of which is
References Cited in the ?le of this patent
controlled by a nosing 63 of plate 62. The latter has 50
two positioning recesses 62a, 621;, corresponding to the
UNITED STATES PATENTS
contact of projections 60d with, brushes 65a, 66a. Cor
responding to said recesses 62a, 621) a pressure small
roller 630 is inserted with elastic stress in such a way as
1,038,404
MarOni _____________ __ Sept. 10, l9l2
1,773,388
Canning _____________ __ Aug. 19, 1930
to ?rmly position the plate 62. Projections 70 cause
temporary opening of switch 5 (5a) while the pressure
2,075,369
2,326,264
Stetler ______________ __ Mar. 30, 1937
Stetler _______________ __ Aug. 10, 1943
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