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Патент USA US3090177

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May 21, 1963
A. ACKERMAN
3,090,167
APPARATUS FOR SKIVING ABRASIVE BANDS FOR
FORMATION OF ABRASIVE BELTS THEREFROM
Filed Sept. 50, 1959
3 Sheets—Sheet l
q)
EINVENTOF!
ARTHUR ACKERMAN
BY
HIS ATTORNEYS
May 21, 1963
A. ACKERMAN
3,090,167
APPARATUS FOR SKIVING ABRASIVE BANDS FOR
FORMATION OF ABRASIVE BELTS THEREFROM
Filed Sept. 30, 1959
5 Sheets-‘Sheet 2
3|3234-35
INVENTOR
ARTH U R ACKERMAN
BY
- 'Fqr'.£i4.uzfi M
HIS ATTORNEYS
May 21, 1963
A. ACKERMAN
3,090,167
APPARATUS FOR SKIVING ABRASIVE BANDS FOR
FORMATION OF ABRASIVE BELTS THEREF‘ROM
Filed Sept. 50, 1959
3 Sheets-Sheet 3
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HIS ATTORNEYS
Unite States
atent
ice
1
3 090 167
APPARATUS FOR sfuvme ABRASIVE BANDS
goR?oRMATIoN
or ABRASIVE BELTS THERE
no
Arthur Ackerman, Wilton, Conn.
Filed Sept. 30, 1959, Ser. No. 843,562;
7 Claims. (01. 51-34.)
This application relates to devices for removing abra
3,090,167,
Patented May 21, 1963
2
FIGURE 3 is an end elevational and partial sectional
, view of the machine; and
FIGURE 4 is an end elevational view of a portion of
the machine.
The form of grinding and belt skiving machine illus
trated herein includes a supporting platform 10 which
may be provided with legs 11 and 12 at its corners to
support the platform ‘at a desired level. Mounted on top
of the platform 10 is a pedestal 13 of generally rectangu
sive grits from at least one end of an abrasive belt prepara 10 lar form. As shown in FIGURE 2, the pedestal 13 may
tory to joining the opposite ends of the belt to form an
be a hollow casting and may be bolted or otherwise se
endless belt for use in belt sanders and the like.
Heretofore, the abrasive grits bonded to the surface of
cured to the platform 10-. Mounted on the pedestal 13
an abrasive belt were removed from a narrow zone or a
by means of bolts 15 is a machine base 16 which may be
‘a hollowed-out casting of generally frame like contour
band at one end of the belt by a scraping operation. The
grits must be removed to enable the ends of the band to
and having inwardly extending side members 16a and 17
de?ning a slot 18 extending generally lengthwise of the
be bonded together by an appropriate adhesive with suffi
cient tenacity to withstand the stresses imposed upon the
machine base frame 16. The slot 18 is disposed on a
bias to the platform 10, so that a web of abrasive coated
belt during belt sanding operations and the like. The
fabric F extending lengthwise of the platform 10 will be
prior scraping or “skiving” operation was slow and ex
pensive and did not always provide a joint or seam strong
disposed on a bias with respect to the axial ‘center line of
the slot 18.
enough to enable prolonged operation of the belts. When
Fixed in the slot 18 between the side members 16:: and
the grits are not removed completely, a good bond cannot
17 are a pair of spaced plates 19 and 20. A member 21
be obtained between the ends of the belt. When the
of T-shaped cross section is slidably ‘mounted between
fabric is scraped or skived too deeply, the textile fabric is 25 the plates 19 and 20 and forms a support for the web of
fabric F.
weakened. Both of these conditions cause premature belt
failure. Moreover, the prior methods produced thick
A groove 22 is formed in the under surface of the
ened seams Where the ends of the belts overlapped and
T-shaped support 21 and carries therein a pair of seg
were bonded together and these seams were a source of
mental gears 23 and 24 which are ?xed to shafts 25 and
weakness and failure of the belts.
30 26 extending through the support and into the plates
In accordance with the present invention, a machine is
19 and 20. The plates 19 and 20 are provided with
provided for removing the abrasive grits at one or both
circular openings 27 and 28 which receive the discs 29
ends of the belt strip with a high degree of ‘accuracy so
and 3t) .ec-centrically mounted on the opposite ends of
that the underlying fabric is not damaged or weakened
the shafts 25 and 26 respectively. When the eccentrics
by the removal of the grits therefrom but nevertheless is 35 28 and 29 are rotated in unison, the T-shaped support
fully exposed to enable an adhesive to be applied there
member 21 is raised and lowered with respect to the
to to bond the ends of the strip together to form a strong
side plates 19 and 20. Rotation of the eccentrics is ac
abrasive belt having long operating life.
complished 1by means ‘of a rack 31 which is slidably
More particularly, in accordance with the present in
mounted ‘between the plates 19 and 2t} and in the groove
vention, a typical machine includes a table for supporting 40 or slot 22 in the T-sha-ped support. The rack engages
an abrasive coated web and a grinding wheel, such as a
the segmental gears 23 and 24. Endwise adjustment
diamond wheel, which is mounted for movement across
of the rack 31 is accomplished by means of the screw
the web to grind the abrasive from a narrow zone of
threaded shaft 32 which is rotatably mounted in the left
the web which corresponds to one or both ends of a belt
hand end of the machine base 15 as viewed in FIGURE
or a group of belts. The machine includes controls for 45 2 and is threaded into threaded sleeve 33 ?xed to ‘an
precisely regulating the depth of grinding accomplished
extension 34 at the left-hand end of the rack .31. The
with the grinding wheel and to compensate for wear of
shaft 32 is rotated by means of a hand wheel 35- mounted
the grinding wheel. It also includes a mechanism for en
on an offset housing 36 as shown in ‘FIGURE 4. The
abling the grinding wheel, when moving in one direction
hand wheel 35 is ?xed to and rotates a shaft 37 carry
across the web, to remove all of the abrasive grits from 50 ing a sprocket 370 which is connected by means of a
a narrow zone and upon return movement to remove only
chain 37b with a sprocket 33 ?xed to the threaded shaft
a part of the layer of abrasive grits from an adjacent zone.
32. Rotation of the hand wheel 35 thereby rotates
the threaded shaft 32 to move the rack 31 lengthwise.
When the web is cut to form belt strips, one end of each
A spring 39 bears against the outer end of the sprocket
strip has a zone from which all of the grits are removed,
while the other end may have a thin layer of the grits. 55 38 and a nut on the end of the shaft 32 to urge the
washer or shoulder 312a against the abutment member
When the ends are joined to form a belt it is of uniform
thickness throughout its entire extent including the seam
where the ends of the belt are joined.
The new vmachine operates efficiently and at high speed
so that high production rates are achieved. High produc
tion rates realized by the invention provide substantial
manufacturing economies and enable the belts to be pro
40 ?xed to the frame thereby eliminating slack from
the system and assuring precision adjustment of the
rack.
Ventical adjustment of the T-shaped support 21 has a
two-fold purpose. First, the adjustment is needed to
control the amount of the abrasive coating to be removed
from the surface of the fabric ‘F and-second, it com
duced at substantially reduced cost.
,
For a better understanding of the present invention, 65 pensates for wear of the diamond grinding wheel W.
As best shown in FIGURE 3, the grinding wheel W is
reference may be had to the accompanying drawings in
driven by an electric motor 41 which is mounted on
which:
a carriage 42 described hereinafter in greater detail
FIGURE 1 is a plan view of a typical grinding machine
which is movable along a rail 43 supported vat its opposite
for skiving abrasive belts, embodying the present inven
ends on uprights 44 and 45 fixed to the opposite ends
tion;
70 of the machine [base 15. The uprights 44 and 45 are
FIGURE 2 is a front elevational and partial sectional
substantially mirror images of each other. As illus
view of the machine;
trated in FIGURE 4, the upright 45 has a curved side
3,090,167
3
4
edge 46 and a notch 47 at the upper end of its opposite
edge 48 in which the carriage-supporting rail 43- is
mounted.
posed on a bias with respect to the support 21. Air is
then admitted to the air cylinder 82 to rock the clamp
ing bars 83 and 34 against the fabric F to hold it against
the supporting plate 21. With the motor 41 operat
ing, air is then admitted into the left-hand end of the
air cylinder 80 so that the carriage 42 and the grinding
wheel W are moved across the fabric F thereby grinding
~ As shown in FIGURES 1-3, the carriage 42 includes
a rectangular base plate *50 having at one end a frame
like member 51 having laterally extending cars 52 and
53 adjacent its upper end. Rollers 54 and 55 are rotat
ably mounted in the cars 52 and 53 and bear against , off the abrasive coating throughout a zone of about the
same width as the width of the grinding wheel W and
a wear plate 56 on the upper edge of the supporting
rail 43.
10 extending completely across the fabric F. At the end
of the movement of the grinding wheel W to the right,
A transverse web 57 of the frame 51 also carries
air is admitted to the air cylinder 73 on the carriage
rotatably ‘a pair of rollers 58 and 59 which roll against
42 so that the motor 41 and grinding wheel W are shifted
a wear plate strip 60 at the upper edge of the rail 43.
axially to the right as viewed in FIGURE 3, a distance
Adjustably mounted on the base plate 50 are a pair of
rollers ‘60a and 61 (FIGURE 1) which bear against a 15 about equal to the width of the grinding wheel. With
the camming surfaces 65 and 66 on the slide plate 64
wear plate or strip 62 secured adjacent the lower edge
in the position shown, such a movement of the motor to
of the guide rail 43. In this way, the carriage 42 is
the right will raise the grinding wheel slightly, for exam
stabilized and can move smoothly along the guide rail 43.
ple, about the thickness of the fabric F. Air is then
The motor 41 and the grinding wheel W are suspended
admitted to the right-hand end of the cylinder 80 so that
from a plate 63 which carries on its bottom surface a.
the carriage is moved to the left along a path parallel
slide plate 64 having wedge-like camrning surfaces 65
to the path followed during its movement to the right.
and ‘66 of small inclination adjacent to its opposite ends.
As a result, a part of the layer of abrasive grits is re
The slide plate 64 rests upon two pairs of rollers 67
moved during the return movement of the grinding wheel
‘and 68 which extend inwardly from the opposite edges
of the plate 50. Thus, the motor and the grinding wheel 25 to the left. At the end of the movement of the wheel
to the left, air is admitted to the right-hand end of the
W can be moved axially with respect to the base plate
air cylinder 73 thereby shifting the abrasive wheel of
50 of the carriage 42. As the camming surfaces 65 and
the motor back to its starting position and air pressure
66 engage the rollers 67 and 68 respectively, the motor
is exhausted from the cylinder 82 thereby releasing the
41 and grinding wheel W are raised with respect to the
carriage 42 and to the web support 21. ‘ The amount that
the grinding wheel W can be raised for a given endwise
movement can be adjusted by providing the slide plate
64 with a rack 69. An adjusting pinion 70 is rotatably
fabric P so that it can be moved through a cutter (not
shown) where the fabric is out along a line between the
two zones from which the grits have been completely
and partially removed. In this way, one end of the
resulting fabric strip has all of the abrasive grits re
mounted on the plate 163 and engages the rack 69 so that
the slide plate 64 can be adjusted endwise relative to 35 moved from a narrow zone at one end while its opposite
end has only a part of the thickness of the layer of
abrasive grits removed therefrom. When the two ends
of the belt are brought into overlapping relation and
bonded together by means of an adhesive, the thickness
an adjusting lever 72 ?xed to pinion 70 permits the slide
40 of the seam is equal to the thickness of the belt else
plate 64 to be adjusted accurately.
where between its ends.
~ The motor 41 and grinding wheel W are moved end
It will be understood that the grinding wheel can be
wise or axially by means of an air cylinder 73 (FIG
adjusted by means of the adjusting arm 72 to remove a
URE 3) carried by the carriage base plate 50 and con
greater or lesser amount of the abrasive coating from
nected by means of a piston rod 74 to an upstanding
lug 75 on the motor mount plate 63 and extending 45 the fabric, depending upon the requirements. Thus, the
machine may be adjusted so that in both its right-hand
through a slot 76 in the base plate 50. Endwise move
and left-hand strokes all of the abrasive coating is re
ment of the motor is limited by a threaded stop member
moved from the fabric. Likewise, the machine can be
77 mounted in a lug 78 on the base plate 50.
adjusted so that on the right~hand stroke all of the
The carriage 42 and the grinding wheel W are moved
along the rail 43 by any suitable motor or drive, such 50 abrasive coating is removed from the fabric while on
the return stroke none of the abrasive coating is removed
as, for example, by means of the air cylinder 89 which
from the fabric.
has a piston rod 81 connected to the carriage frame 51
The machine can be operated manually as described
‘(FIGURES =1 and 2). Application of air pressure to
above or it can be provided with an appropriate control
opposite ends of the air cylinder 80 alternately will cause
the grinding wheel to move back and forth lengthwise 55 system whereby the operations of the machine are auto
matically controlled. Accordingly, the machine described
of the web support 21.
herein can be adjusted and operated as the purpose
A further control member for the machine is the air
demands and that webs of fabric of different widths, cor
cylinder 82 shown in FIGURE 3 which operates a pair
responding to a plurality of belts, can be skived by means
of clamping bars 83 and 84 mounted on ‘arms or plates
85 ‘and 86 carried by the shafts 87 and 88 which are 60 of the machine thereby enabling high production rates to
be attained with the machine.
rotatably supported at their opposite ends in the bosses
It will be understood that the machine is susceptible
89 and 90 on the end frames 44 and 45. The shafts 87
to considerable modi?cation in its various components
and 88 are rocked by means of levers ~91 and 92 ?xed
and, accordingly, the form of the invention described
to the shafts and connected, respectively, to one end of
the air cylinder 82 and one end of the piston rod 93 of 65 herein should be considered as illustrative.
I claim:
the air cylinder. The machine may be provided with
the motor and the supporting plate 63 by rotation of the
pinion 70. A selector 71 ?xed to the motor having
means thereon for releasable locking engagement with
appropriate protective means such as the grinding wheel
1. An apparatus for removing abrasive from portions
guard 95. Moreover, dust shields such as the strips 96
‘and 97 on the support 21 may be included to protect the
of an abrasive coated fabric for the formation of abra
sive belts therefrom comprising a support for an abra
sive coated fabric, a motor driven abrasive wheel, means
supporting said wheel for movement across said fabric
operating parts of the machine from abrasive materials.
In the operation of the device, the supporting plate
21 is adjusted into a predetermined spaced relation to
the grinding wheel W equal essentially to the thickness
of the fabric of the web F. Web F is then pulled into
in engagement therewith for grinding at least a part of
the abrasive coating from said fabric along the path of
said wheel, means for effecting a back and forth recip
a position so that it overlies the support 21 and is dis 75 rocating movement of said wheel across said fabric, and
3,090,167
6
means for shifting said wheel axially through a distance
coated fabric, a carriage, means supporting said carriage
about equal to the thickness of said wheel at one end of
in spaced relation to said support for movement across
said fabric, a motor on said carriage, a grinding wheel
on said carriage and driven by said motor, means for
said path and axially in the opposite direction through
the same distance at the opposite end of said path and
for guiding said wheel along parallel courses at least
reciprocating said carriage along said supporting means
therefor, means for adjusting said support and said wheel
partially displaced from each other during said back and
forth reciprocating movement.
2. An apparatus for removing abrasive from portions
relatively to enable said Wheel to engage said fabric and
of an abrasive coated fabric for the formation of abra
sive belts therefrom comprising a support for an abra
sive coated fabric, a carriage, means supporting said car
‘across said fabric, ‘and means for changing the spacing
between the wheel and said support at opposite ends
riage in spaced relation to said support for movement
grind said abrasive therefrom along a path extending
of said path.
6. An apparatus for removing abrasive from portions
across said fabric, a motor on said carriage, a grinding
of an abrasive coated fabric for the formation of abrasive
wheel on said carriage and driven ‘by said motor, means
belts therefrom comprising a support for an abrasive
for effecting a back and forth reciprocating movement 15 coated fabric, a carriage, means supporting said carriage
of said carriage along said supporting means therefor,
in spaced relation to said support for movement across
means for adjusting said support and said wheel rela
said ‘fabric, a motor on said carriage, a grinding wheel
tively to enable said wheel to engage said fabric and
on said carriage {and driven :by said motor, means for
grind said abrasive therefrom along a path extending
reciprocating said carriage along said supporting means
across said fabric, and means on said carriage for shift— 20 therefor, means for adjusting said support and said wheel
ing said wheel axially in one direction at one end of
relatively to enable said wheel to engage said fabric and
said path and axially in the opposite direction at the
opposite end of said path and for guiding said wheel
along parallel courses at least partially displaced from
each other during said back and ‘forth reciprocating 25
movement.
grind said abrasive therefrom along a path extending
across said fabric, means on said carriage [for shifting
said wheel axially in one direction at ;one end of said
path and axially in the opposite direction at the opposite
end of said path, ‘and means for changing the spacing
3. An apparatus for removing abrasive from portions
between said wheel and said support at opposite ends
of an abrasive ‘coated fabric for the formation of abrasive
of said path to remove ‘all of the abrasive from the fabric
belts therefrom comprising a support for an abrasive
in the path of said grinding wheel at it moves in one
coated fabric, a guide rail mounted on said support in 30 direction across the ‘fabric and to remove only a portion
spaced relation thereto and extending transversely of said
of said abrasive from said fabric in the path of said grind
fabric, a carriage mounted on said rail for movement
ing wheel as it moves in the opposite direction across
lengthwise thereof, a motor-driven grinding wheel
mounted on said carriage with its axis substantially per
said fabric.
7. A11 apparatus for removing abrasive from portions
pendicular to said rail, means for adjusting the spacing 35 of an abrasive coated fabric for the formation of abrasive
between said support and said grinding wheel, means for
‘belts therefrom comprising ‘a support for an abrasive
moving said carriage lengthwise of said rail in one direc
coated fabric, 1a guide rail mounted on said support in
tion and lengthwise of said rail in the opposite direction
spaced relation thereto and extending transversely of
to engage said grinding wheel with said fabric along paths
said fabric, a carriage mounted on said rail for movement
[across said fabric, and means on said carriage for moving 40 lengthwise thereof, a motor-driven grinding wheel
said grinding wheel axially in one direction at one end
mounted on said carriage “with its axis substantially per
of its path, for moving said grinding Wheel ‘axially in
pendicular to said rail, means for adjusting the spacing
the opposite direction at the other end of its path, and
between said support and said grinding wheel, means for
for guiding said wheel along parallel courses at least
moving said carriage lengthwise of said rail to engage
partially displaced from each other during successive 45 said grinding wheel with said fabric along a path across
movements in said one and said opposite ‘directions to
said fabric, means on said ‘carriage for moving said grind
remove the abrasive coating at least partially from said
ing wheel axially in one ‘direction 1at one end of its path
fabric throughout 1a zone of a width greater than the
and for moving said grinding wheel axially in the oppo
thickness of said grinding wheel.
1
site direction at the other end of its path to remove the
4. An {apparatus for removing abrasive from portions 50 abrasive coating at least partially from said fabric
of an abrasive coated fabric for the formation of abrasive
belts therefrom comprising a support for an abrasive
coated fabric, a motor driven abrasive wheel, means
supporting said wheel for movement across said fabric
throughout a zone of a width greater than the thickness
of said grinding wheel, means on said carriage for mov
ing said grinding wheel toward said support at one end
of said path and away from said support at the opposite
in engagement therewith for grinding at least a part of 55 end of said path, and means on said carriage for adjust—
the abrasive coating from said fabric along the path of
ing the amount of movement of said wheel toward and
said wheel, means ‘for reciprocating said wheel across
away from said support.
said fabric, means for shifting said wheel axially through
a distance about equal to the thickness of said wheel at
References Cited in the ?le of this patent
one end of said path and axially in the opposite direction
UNITED STATES PATENTS
through the same distance at the opposite end of said
523,882
Covel _______________ __ July 31, 1894
path, and means for moving said grinding wheel away
2,712,987
Storrs _______________ __ July 112, 1955
from said support at one end of its path and toward said
support at the opposite end of its path.
2,726,489
Hawkins _____________ __ Dec. 13, :1955
5. An apparatus for removing abrasive from portions 65
of an abrasive coated fabric for the formation of abrasive
belts therefrom comprising a support ‘for an abrasive
2,769,280
2,774,191
\Comstock _____________ __ Nov. 6, 1956
Bouchez _____________ __ Dec. 18, 195.6
2,899,288
Barclay ________ __\ ____ __ Aug. 11, 1959
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