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Патент USA US2405328

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Aug. 6, 1946.
J. ROBINSON, JR
~
2,405,328
SANDING MACHINE
Filed Nov. 2, 1945
4 Sheets-Sheet~ 1
Aug» 5, 1946-
Y J. ROBINSON; JR I
2,405,328
SANDING MACHINE
Filed NOV. 2, 1945
4 Sheets-Sheet 2
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D Aug. 6,1946
J. ROBINSON, JR
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2,405,328
SANDING MACHINE
Filed Nov. 2, 1945
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Aug- 6, 1946-‘
J. ROBINSON, JR
2,405,328
‘SANDING MACHINE
Filed Nov. 2; 1945
4 Sheets-Sheet‘ 4‘
(Ittornegs
Patented Aug. 6, 194-6
2,4055%
UNITED STATES PATENT OFFICE
2,405,328
SANDING MACHINE
‘Joseph Robinson, Jr., Dover, Ohio, assignor to
Marsh Wall Products, I110., Dover, Ohio, a cor
v poration of Ohio
Application November 2, 1945, ‘Serial No. 626,237
15 Claims. (or. 5-1-78)
1
2
The invention relates to sanding machines and
more particularly to certain improvements upon
my co-pending application, Serial No. 587,924,
?led April 12, 1945. This type of sanding ma—
chine was especially designed for sanding wall
panels and the like, comprising a ?at board or
the portions of the sand paper in use become
panel of pressed ?bre board such as Masonite, or
other suitable material, coated with several coats
of paint or enamel.
worn.
.
.
v
.:
It is known that machines'have been-designed
to automatically feed the sand paper, or other
.abrasive surface ?nishing material, around the
periphery of thedrum so as to continuously .pre;
sent new portionsof the sand paper to the work,
but in such machines the feeding of the sand
paper around the periphery of the drum is auto
In the manufacture of these wall panels, the
matically controlled by the rotation of the drum
surface of the board is ?rst coated with a thin
itself. This may result in a considerable waste
prime coat of paint or enamel which after dry,
of sandpaper as the feeding mechanism will op
ing or curing is thoroughly sanded before the fin
erate continuously duringv the rotation of the
ish coat or coats are applied, the sanding being
drum regardless of whether or not Work is being
necessarily light enough so as not to cut through 15 passed through the machine.
’
the prime coat at any point and yet suiiiciently
The object of the present improvement‘ is to
?rm to remove any small projections or bumps
provide means controlled by the wall panels or
caused by particles of dust or dirt which may have
other work passing through the sanding machine
for feeding the sand paper around the periphery
fallen upon the board before it is coated, or which
may have adhered to the prime coat before it 20 of the sandingdrum and over the spaced pairs
has dried.
.
of ?exible brushes thereon.
.
'
i
7.
Another object is to provide a‘ sanding machine
Owing to the fact that there were no sanding
of the character referred to inwhich. the wall
machines which had been found to be satisfactory
panels, or boards, are passed over a table be
for this sanding operation, it had ‘been necessary
to perform the same by hand, until I developed 25 neath the sanding drum, the panel or. board be
ing moved across the table by means of a pair
the sanding machine forming the subject matter
of spaced rolls contacting opposite surfaces of
the board, one of said rolls being driven and the
other roll being rotated by the movement of the
table over which the wall panel is moved ‘beneath
a rotating sanding drum having pairs of spaced 30 panel upon the table and controlling mechanism
which automatically feeds the sand paper around
brushes around its periphery and having sand
the periphery of the sanding drum.
. .
paper located over each spaced pair of brushes
A
further
obiectis
the
provision
of
a
sanding
and. spanning the space therebetween.
machine of- this character in which the mecha
This type of sanding machine is now in use _
nism which feeds the sand paper around the drum
for sanding wall panels such as above referred to,
includes an instantaneous switch which‘is inter
and has operated very satisfactorily to properly
mittently operated by the passing of the wall
sand the entire coated surface of the wall panels,
panels
through the machine, each operation of
the ?exibility of the brushes and the sand paper
said
instantaneous
switch'causing a movement of
located across each spaced pair of brushes per
the sand paper feedingmechanism.
.
mitting thicker portions of the board to be prop
A
still
further
object
is
the
provision
of
a ma
erly sanded without cutting through the coating
chine of this character in which the instantane
of paint or enamel, while due to centrifugal force
ous switch energizes a solenoid which operates
the sand paper spanning the space between each
the sand paper feeding mechanism upon the
pair of spaced brushes is ?exed outward so as to ‘ drum.
of my aforesaid application, Serial No. 587,924.
This sanding machine comprises generally a
thoroughly sand any thin portion of the board or ,
panel.
The present invention contemplates the provi
sion of a sanding machine having a drum of the
general type above referred to provided with
pairs of spaced ?exible brushes over which the
sand paper is located, with additional means for
automatically feeding the sand paper around the
periphery of the drum so as to continuously pre
sent new surfaces of sand paper to the work as
Another object of the invention is the provi
sion of a machine of this character in which the
sand paper is .fed around‘the drum by means of
a pair of friction rolls engaging opposite end por
tions of the strip of sand paper and simultane
ously driven in the same direction through mech
anism operated by the solenoid,
:
‘The above objects, together with others which
will be apparent from the drawings and follow
ing description, or which may be later referred
2,405,328
3
4
to, may be attained by constructing the improved
in comprising the ?exible bristles 32 located in
channel frames 33 and extending longitudinally
through the length of the drum.
Elongated blocks 34 may be provided for clamp
ing each spaced pair of ?at brushes within its
sanding machine in the manner illustrated in the
accompanying drawings, in which;
Figure 1 is a front elevation of a sanding ma
chine embodying the invention, with parts broken
channel holder 3| and arranged to be forced
apart and against the brushes as by a wedge
' strip 35 drawn down into place by screws 36.
away for the purpose of illustration;
Fig. 2 an end elevation of the sanding machine
shown inFig. 1, parts being broken‘ away to show
A strip or sheet of sand paper, indicated gen
the interior of the machine;
Fig. 3 an end elevation of the sanding drum
erally at S, of a width substantially the length
of the drum, is placed entirely around the drum
on a much larger scale;
Fig. 4 a fragmentary, detail elevation‘of the
over the ends of the bristles 32 and under the
mechanism for intermittently operating the sand
7 rolls or rods?! in the manner shown in Fig. 3.
These rolls 31', are of the same length as the
paper feeding rolls;
.
drum and their end portions are journalled as in
Fig. 5 a section taken as on the line 5-5,
dicated at 37' upon the radially disposed adjust
ing members 38 which may be radially adjust
ably connected to the heads 39 at the ends of the
Fig. 4;
Fig. 6 an enlarged detail elevation of the work
operated roll and the mechanism controlled
thereby for operating the instantaneous switch;
Fig. 7 a view similar to Fig. 4 showing a modi
?ed form of sand paper
Fig. 8 a fragmentary,
the bearing portion of
the drum underrwhich
drum as by the screws 40 and slots 4|, so that any
20
feeding mechanism; and
detail sectional view of
one of ‘the rollers upon
the sheet of sand paper
desired tension may be placed upon the sheetof
sand paper by radially adjusting these rollsrwith-l
in the recessed ‘portions 42 of the drum.
Each end of the sand paper. strip or sheet may
be frictionally engaged between one of the fric
25 tion rollers 43 and the cooperating flange or
is located.
,
plate 44. By rotating both of the rollers 43 in
The improved machineis illustrated in the ac
companying drawings as comprising substantial
ly the sanding machine disclosed and claimed in
my pending application, Serial No. 587,924, above
referred to, with the additions of the said paper 30
paper will be moved circumferentially around the
entire drum, feeding the leading edge of the sand
feeding mechanism to which the present appli
cation more particularly pertains.
sponding plate 44, while the other end of the
paper is fed outward between the other roll and
the same direction, it will be seen that the sand
paper inward between one roll 43 and its corre
its plate.
‘
The machine may be supported upon the up
As shown in Fig. 3, with the two rolls 43 ro
rights or legs l0 located at the corners of the
machine and braced as by the cross bars .I l , hori 35 tating in the directions of the arrows, the leading
end L of the sand paper will be fed inward while
zontal frame members I2 being connected to the
the opposite end portion 0 will be simultaneous
upper ends of the uprights.
'
ly fed outward.
The sanding drum is indicated generally at 13
For the purpose of operating these rolls, a
and ?xed upon a shaft 14 journalled in bearings
i5‘a‘t opposite ends of the frame. On opposite 40 worm gear 45 is ?xed upon one outer end of each
roll 43 and meshes with a worm screw 46, the
sides of the drum are located the feed rolls l6
shaft 41 of which is journalled in bearings 48
and I1 joumalled in bearings 18 mounted upon
mounted upon the adjacent head 39 of the drum.
the frame members.
' To compensate for boards or panels of differ
A ratchet wheel 49 is ?xed upon each worm
ent thicknesses, the table I3 over which the panel 45 screw shaft 41 and is engaged bya pawl 50 piv
oted as at 5| upon a sleeve 52 slidably keyed
or boards ‘are arranged to be slidably moved be
upon the shaft l4 of the drum as indicated‘at 53.
neath the drum, may be vertically adjustably
The sleeve 52 is provided with an annular
mounted upon the uprights ID, by means of the
groove 54 which receives a yoke 55 formed upon
sliding frame members 20 adapted to be held in
adjusted position as by the clamping screws 2!. 50 one end of the arm 56 which is ?xed upon one end
of the armature 51 of the solenoid 58 which is
Rolls 22 and 23 are journalled in said sliding
?xedly mounted through the adjacent bearing
frame and adapted to cooperate with the upper
bracket l5 for the drum shaft l4.
rolls [6 and H to feed the panels or boards, in
It will be seen that as the solenoid 58 is ener
dicated generally at B, through the machine and
gized the armature 5'! thereof will be reciprocated
beneathAthe drum 13.
A hood 24 may be located over the entire top of
the machine and connected to an exhaust pipe 25
through which all dust may be removed by suc
tion.
'
A hold down device may be provided for hold
ing the board or panel down upon the table as it
passes through the machine and may comprise a
outward, or to the left as viewed in Figs. 1 and 4,
and through the yoke 55. the sleeve 52 will be'cor
respondingly moved to the left causing the pawls
‘ 50 to rotate the ratchets 49 in the direction of the
arrow shown in Fig. 5 a distance of one tooth. As
the solenoid is de-energized the spring 59 will
return the armature 51, arm 56 and sleeve 52 to
the normal position as shown in Figs. 4 and 5.
board 26 of slightly ?exible material hingedly
With each movement of the sleeve 52 as above
connected at its upper’ end to one side of the
hood as at 21, the free end of the hold down 63 described, the worm screw 46 will be given a
slight turning movement and through the worm
board being'held down against the top surface
gears 45 the rolls 43 will be rotated in unison in
of the panel or board as by the spring 28.
the direction of the arrows shown in Fig. 3.
The sanding drum, indicated generally at I3.
For the purpose of intermittently energizing
is shown in detail in Fig. 3 and may be of polyg
onal form having" the spaced projecting portions * the solenoid 58 attention is called to the mecha
nism shown in detail in Fig. 6 and also illustrated
29 terminating in the ?at tangential surfaces 33.
in Figs. 1 and 2. The shaft 60 of the roll 22 is
A channel member 3| is shown ?xed upon each
?at surface 30 and extends longitudinally
throughout the length of the drum and a spaced
operatively connected to reduction gearing ,(not
pair of elongated, ?at brushes is mounted there
reduction gearing may be of any usual or well
shown) located within the gear housing 6|. This
2,405,328
5
6
known design and as the particular type of gear
45 and worm screws 46 may be the same as shown
ing does not in itself form any part of the inven
in Figs. 3 and 4 and the same reference numerals
tion, but is merely provided for reducing the
are applied thereto in Fig. 7. However, instead
speed of the pulley 62 relative to that of the
of ?xing a ratchet upon the end of each worm
roller 22, it is not thought necessary to illustrate $1 screw shaft 41, a beveled pinion ‘H is ?xed upon
the gearing.
each of these shafts and meshes with a bevel gear
The pulley 62 is shown operatively connected,
12, rotatable relative to the shaft l4 and held in
as by a belt 63, with a pulley 64. A stud 65 is
mesh with the pinion ‘H as by a collar 13 ?xed
?xed upon one side of the pulley 64 and adapted
upon the shaft.
to contact the ?nger or button 66 upon the in 10
The sleeve 52a is .slidably keyed upon the shaft
stantaneous switch 61 once in each complete rev
l4 and arranged to be operated by the yoke’ 55
olution of the pulley 54. The instantaneous
upon the arm 56 which is ?xed‘ upon the arma
switch 6'! is located in a suitable electric circuit
ture of the solenoid in the same manner as ‘shown
(not shown) and connected by the wires 68 with
in Fig. 4. The sleeve 52a comprises a clutch mem
the solenoid 58.
15 ber having the friction surface 14 adapted to be
Thus as the wall panels or boards are fed
moved into frictional contact with the rear side of
through the machine the roll 22 will be rotated
the“ beveled gear 12 when the solenoid is ener
thereby and through the reduction gearing in the
gized, causing the beveled gear to rotate with the
housing 6|, the pulley 64 will be slowly rotated
shaft I4 and through the beveled pinion ‘H to
each complete revolution thereof operating the
give a slight turning movement to the worm
instantaneous switch .61 to energize the solenoid
screws 46‘. Otherwise the operation of this sand
58 and through the mechanism shown in Figs. 4
paper feed mechanism is the same as that shown
and .6, and above described in detail, the rolls 43
in Fig. 4.
'
will be given a slight rotation to feed the sand
From the above it will be obvious that the sand
paper around the circumference of the sanding
paper will be automatically fed circumferentially
drum, presenting new surfaces of sand paper to
the work as the portions thereof in use become
worn.
,
For the purpose of driving the drum l3 and roll
IS in the direction of the arrows shown on Fig. 2,
pulleys 69 and ‘Hi, or their equivalents, may be
fastened upon the shafts of the drum and roll re
spectively for connection to any suitable driving
means. Both the drum and the fed roll may be
rotated at the desired speed. very satisfactory re
sults being obtained in actual practice by rotating
the drum at approximately ‘700 revolutions per
minute and. the feed roll at a proper surface speed
to move the boards or panels about 25 feet per
minute.
around the drum, presenting new portions of the
sand paper to the work as the portions in use
become worn, the feed mechanism being con
trolled by the movement of the wall panels or
boards through the machine so that the sand
paper will be fed around the drum at the proper
speed to accommodate the amount of work pass
ing through the machine and so as not to change
the adjustment of the sand paper excepting when
work is passing through the machine.
1 ,
Thus it will be seen that the sanding drum may
continue to operate for a considerable period of
time during which no boards are passed through
the machine without changing the adjustment of
40 the sand paper and causing any waste of sand
paper.
With the drum rotating at the proper speed in
clockwise direction, as viewed in Figs. 2 and 3,
I claim:
and the wall panels or boards moving at the
1. A surface ?nishing machine including aro
proper rate of speed from left to right, as viewed
tating drum, a sheet of ?exible surface ?nishing
in said ?gures, the surface of the board or panel 45 material located around said drum, a winding roll
being sanded will be intermittently contacted
and an unwinding roll engaging opposite end por
in rapid succession by the portions of the sand
tions of said sheet of surface ?nishing material,
paper located over the several spaced pairs of
means for moving work through the machine in
brushes and spanning the space between the
contact with the surface ?nishing material and
brushes of each pair.
means controlled by the movement of the work
Referring to Fig. 3, it will be obvious that when
for operating the winding roll and unwinding roll
the drum is rapidly rotated these portions of sand
for moving the sheet of surface ?nishing material
paper, stretched between the brushes of each pair
circumferentially around the drum.
as indicated‘at C, will be thrown outward by cen
2. A surface ?nishing machine including a ro
trifugal force.
tating drum, a sheet of ?exible surface ?nishing
As each of these portions of sand paper con
material located around said drum, a winding roll
tacts the surface of the board or panel, they will
and an unwinding roll engaging opposite end por
be ?exed slightly inward. If a high point of the
tions of said sheet of surface ?nishing material,
board is encountered, the ?exibility of the brushes
means for moving work through the machine in
and the portion of the sand paper spanning the 60 contact with the surface ?nishing material and
space between the brushes of each pair will com
means controlled by the movement of the work
pensate for the same, the sand paper being ?exed
for intermittently operating the winding roll and
inward and the brushes 32 being slightly ?exed
unwinding roll for moving the sheet of surface
as shown at the bottom of Fig. 3.
?nishing material circumferentially around the
When a low point of the board is encountered,
drum.
the sand paper will contact the same as it is
3. A surface ?nishing machine including a ro
?exed outward due to centrifugal force. Thus it
tating drum, a sheet of ?exible surface ?nishing
will be seen that all portions of the surface of a
material located around said drum, a winding roll
board will be properly sanded, the construction
and an unwinding roll engaging opposite end por
compensating for any variations in thickness in
tions of said sheet of surface ?nishing material,
the board.
means for moving work through the machine in
In Fig. '7 is shown a slight modi?cation of the
contact with the surface ?nishing material, means
mechanism operated by the solenoid which inter
for operating the winding roll and unwinding roll
mittently rotates the worm gears 46. In this
for moving the sheet of surface ?nishing material
form of the invention, the rolls 43, worm gears ' circumferentially around the drum, and means
2,405,328
a‘tingsaid roll operating means.
>
i
" '
'
drum, a solenoid for operating said worm gear
means, and means controlled by the movement of
’ "4. A'surface ?nishing machine including a ro
tating drum, 1a sheet of ?exible surface ?nishing
material located around said drum, a winding roll
and an unwinding roll engaging opposite end por
the work for energizing said solenoid.
10. A surface ?nishing machine including a ro
tating drum, a sheet of ?exible surface ?nishing
material located around said drum, a winding roll
and an unwinding roll engaging opposite end por
tions of said sheet of surface ?nishing material,
means for moving work through the machine in
contact with the surface ?nishing material,
means for operating the winding roll and un
winding roll for moving the sheet of surface ?n
ishing material around the drum, a solenoid for
operating said roll operating means, an instan
tions of ‘said sheet ‘of surface ?nishing ‘material,
means for moving work‘ through the machine in
contact with the surface ?nishing material, means
for operating the winding roll and unwinding roll
for moving the sheet of surface ?nishing material
circumferentially around the drum, and means
controlled by the movement of the work for inter
mittentlyoperating'said roll operating means.
' :5. A‘ surface ?nishing machine including a ro
tating drum, a sheet of ?exible'surface ?nishing
taneous switch for energizing said solenoid, and
means controlled by the movement of the work
material located around said drum, 7 a winding
roll and an unwinding roll engaging opposite end
portions of said sheet'of ‘surface ?nishing material,
means for moving work through the machine in 20
contact with the surface ?nishing material, means
for operating the winding roll and unwinding roll
for moving the sheet of surface ?nishing mate
rial circ‘umferentially around the drum, a sole
noid for‘ operating said. roll operating means, and
means controlled by the movement of the work
for energizing said solenoid.
'
'
6AA surface ?nishing machine including‘ a ro
tating drum, a sheet of ?exible surface ?nishing
8
unwinding roll for moving the sheet of surface
?nishing material circumferentially around the
controlled by the movement of'the workfor oper
for operating said instantaneous switch.
'
11. A surface ?nishing machine including a ro
tating drum, a sheet of flexible surface ?nishing
material located around said drum, a winding
roll and an Luiwinding' roll engaging opposite end
portions of said sheet of surface ?nishing mate
rial, means for moving work through the machine
in contact with the surface ?nishing material,
means‘for operating the winding roll and unwind
ing roll for moving the sheet of surface ?nishing
material around the drum, a solenoid for operat
material located around said drum, a winding roll 30 ing said roll operating means, an instantaneous
switch for energizing said solenoid, and ‘means
and an unwinding roll engaging opposite end poré
controlled by the movement of the work for in
tions of said sheet of surface ?nishing material,
means for moving work through the machine'in
contact withthesurface?nis'hing material, means
termittently operating said instantaneous switch.
12. A surface ?nishing machine including a ro
for operating the winding ‘roll and unwinding roll
tating drum, 2. sheet of ?exible surface ?nishing
‘for moving the sheet of surface ?nishing material
circumferentially around the drum, a solenoid for
operating said rollv operating means, and means
material located around said drum, a winding
roll and an unwinding roll engaging opposite end
portions of said sheet of surface ?nishing mate
rial, a driving roll and a cooperating work driven
controlled by the movement of the work for inter
mittently energizing said solenoid.
’
~10 roll for moving work through the machine in con
'7. A surface ?nishing machine including, a ro
tact with the surface ?nishing material, and
tating drum, a sheet of ?exible surface ?nishing
material located around said drum, a winding roll
and an unwinding roll engaging opposite end por
tions of said sheet of surface ?nishing material,
means for moving work through the machine in
contact with the surface ?nishing material, means
upon the drum for operating the winding roll and
unwinding roll for moving the sheet of surface
?nishing material circumferentially around the
drum, a solenoid for operating said roll operating
means, and means controlled by the movement of
the work for energizing said solenoid.
means controlled by said work driven roll for op
8. A surface ?nishing machine including a ro
tating drum, a sheet of ?exible surface ?nishing
material located around said drum, a winding roll
and an unwinding roll engaging opposite end pore
tions of said sheet of surface ?nishing material,
means for moving work through the machine in
contact with the surface ?nishing material, means
upon the drum for operating the winding roll and
unwinding roll for moving the sheet of surface
?nishing material circumferentially around the
drum, a solenoid for operating said roll operating
means, and means controlled by the movement of
the work for intermittently energizing said sole
noid.
erating the winding roll and unwinding roll for
moving the sheet of surface ?nishing material
circumferentially around the drum.
13. A surface ?nishing machine including a
rotating drum, a sheet of ?exible surface ?nishing
material located around said drum, a winding roll
and an unwinding roll engaging opposite end
portions of said sheet of surface ?nishing mate
rial, a driving roll and a cooperating work driven
roll for moving work through the machine in con
tact with the surface ?nishing material, means
for operating the winding roll and unwinding roll
for moving the sheet of surface ?nishing material
circumferentially around the drum, a solenoid for
operating said roll operating means, and means
controlled by said work driven roll for energizing
vsaid solenoid.
14." A surface ?nishing machine including a ro
tating drum, a sheet of ?exible surface ?nishing
material located around said drum, a winding roll
and an unwinding roll engaging opposite end por
tions of said sheet of surface ?nishing material,
a driving roll and a cooperating’work driven roll
for moving work through the machine in contact
with the surface ?nishing material, means for op
erating the winding roll and unwinding roll for
9. A surface ?nishing machine including a ro
moving the sheet of surface ?nishing material
tating drum, a sheet of ?exible surface ?nishing
material located around said drum, a winding roll 70 circumferentially around the drum, a solenoid for
operating said roll operating means, and means
and an unwinding roll engaging opposite end por
controlled by said work driven roll for inter
tions of said sheet of surface ?nishing material,
mittently energizing said solenoid.
means for moving work through the machine in
15. A surface ?nishing machine including a ro
contact with the surface ?nishing material, worm
gear means for operating the winding roll and 76 tating drum, a sheet of flexible surface ?nishing
9
2,405,328‘
material located around said drum, a winding roll
and an unwinding roll engaging opposite end por
tions of said sheet of surface ?nishing material,
a driving roll and a cooperating work driven roll
for moving work through the machine in contact
with the surface ?nishing material, means for
operating the winding roll and unwinding roll
10
for moving the sheet of surface ?nishing material
circumferentially around the drum, a solenoid for
operating said roll operating means, an instan
taneous switch for energizing said solenoid, and
means controlled by said work driven roll for
operating said instantaneous switch.
JOSEPH ROBINSON, J R.
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