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Патент USA US3032095

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May 1, 1962
T. J. STEPHENS ETAL
3,032,083
DEVICE FOR ADJUSTING THE SET MECHANISM OF A SAWING RIG
Filed Feb. 5, 1960
A
5 Sheets-Sheet l
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INVENTOR.
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May 1, 1962
T. J. STEPHENS ETAL
3,032,083
DEVICE FOR ADJUSTING THE SET MECHANISM OF A SAWING RIG
Filed Feb. 5, 1960
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INVENTOR.
srzpww:
May 1, 1962
T. J. STEPHENS ETAL
3,032,083
DEVICE FOR ADJUSTING THE SET MECHANISM OF A SAWING RIG
Filed Feb. 5, 1960
L
3 Sheets-Sheet 5
I20
"Y Moi/74w;
trite States
NE
3,032,083
Patented May 1, 1962
2
1
boards 18 of whatever thickness desired can be taken
3,032,083
from the log.
DEVICE FUR ADJUSTING THE SET MECHANISM
OF A SAWING RIG
Thomas J. Stephens, 510 W. North St., and Wiiliam J.
Stephens, RED. 2, both of Arcanum, Ohio
Filed Feb. 5, 1969, Ser. No. 6,893
6 Claims. (Cl. 143-120)
,
The platform It) is reciprocated by any well known
means such as by a cable 20 attached thereto passing
about sheaves or pulleys 22 located beneath the plane of
the platform 10 and with the cable being driven by a
reversible drive such as a reversible electric motor.
The
travel of the platform can be controlled by the sawyer, or
This invention relates to vsaw mill equipment and is
limit switches may be provided which determine the limits
particularly concerned with an improved arrangement for 10 of travel of the platform.
voperating the set mechanism of a sawing rig so that boards
Mounted on platform 10 is a log supporting means of
of the desired width can readily and rapidly be sawn from
a structure consisting of two or more frames, or knees
a log.
,
24 which are guided in tracks or headblocks 26 for move
Heretofore, set mechanisms have generally ‘been oper
ment laterally of the platform 10‘ so that a log supported
ated manually and this, of course, is occasioned by loss 15 on the frames, or table, can be adjusted laterally of saw
of valuable operating time of the sawing rig. Motorized
blade 16. The frames 24 each comprise upstanding por
devices for operating the set mechanism of a sawing rig
tions 28, each of which has an adjustable gripper or dog
are known but heretofore such mechanisms have tended
to involve the use of rotating electric motors or the like
3i"; at the upper end so that when a log is positioned on
the frames it is provided with a black stop and also with
which develop considerable inertia in operation whereby 20 gripping means for holding it ?rmly in place on the frame.
the termination of the adjustment tends to be less precise
than desired whereby the boards have some tendency to
vary in thickness.
Adjustment of the back stops can be accomplished by
the levers 32 to accommodate the frame to logs of dif
ferent size and likewise the gripping members 30 can
Accordingly it is a primary object of the present in
‘be adjusted not only vertically but in the fore and aft
vention to provide a greatly improved automatic adjusting 25 directions as well. The log supporting‘ table consisting
mechanism for the set mechanism of a sawing rig.
of the frames 24 is adjustable laterally of the table 10 by
A still further object of this invention is the provision
a mechanism that will be seen in FIGURES 1 and 3.
of automatic means for adjusting the set mechanism of a
sawing rig in which the adjustment can readily be varied
to provide for different thicknesses of cut.
A still further object of this invention is the provision
of an automatic arrangement for adjusting the set mech
anism of a sawing rig which can readily be incorporated
in existing equipment thus permitting the arrangement to
be manufactured and sold not only for incorporation in
new equipment but as an auxiliary to be added to equip
ment already in use.
These and other objects and advantages will become
more apparent to the drawings in which:
FIGURE 1 is a perspective view showing the principal
components of a sawing rig having a set adjusting mech
anism according to the present invention incorporated
therewith;
,
FIGURE 2 is a section indicated on line 2-—2 on FIG
This mechanism consists of ‘a setshaft taking the form of
shaft 34 extending longitudinally of the table and through
30 the tracks 26 beneath the frames 24.
Each frame 24
has attached to its underside a rack 36 which is engaged
by ‘a pinion 38 keyed to shaft 34. It will be evident that
rotation of shaft 34 will adjust the frames 24 in unison
whereby a log supported on the table which consists of
the frames 24 will be moved in parallelism with itself
laterally of platform 10.
A motor (not shown) may be provided for driving
shaft 34 in its opposite directions and the shaft directly
driven by such motor, said shaft being indicated at 40,
is preferably connected with shaft 34 by means of torsion
spring ‘42. This permits adjustment of shaft 34 by means
other than the said motor without rotation of shaft 40
and also permits a spring bias to be maintained on shaft
34 so that it can be returned to a starting position auto
URE 1 showing a portion of the set adjusting mechanism 45 matically after it has been adjusted from that position by
the means other than the said adjusting motor.
according to this invention;
FIGURE 3 is a sectional view indicated by line 3--3
Manual means of a conventional nature are provided
on FIGURE 1 showing the structure by means of which
for adjusting the shaft 34 and this may take the form
the table of the saw rig is adjusted laterally to provide
of a lever 44 mounted for oscillation about the axis of
50 shaft 34 and carrying a pawl adapted for driving engage
for the desired thickness of cut;
FIGURE 4 is a sectional view indicated by line 4—4
ment with the periphery of a gear-like member 46 at
on FIGURE 2 showing the several adjustable cams by
tached to the shaft 34. This pawl will drive gear-like
means of which the automatic set adjusting mechanism is
member ‘46 in the direction of rotation necessary to inove
controlled; and
frame 24 to advance log‘ 14 toward saw blade 16; Such
FIGURE 5 is a more or less diagrammatic representa
mechanism would also include a lock pawl (not shown)
tion of the set adjusting mechanism according to this in
to hold the gear-like ‘member 46, and, therefore, shaft 34
vention and the control circuit pertaining thereto.
Referring to the drawings somewhat more in detail,
‘ FIGURE 1 more or less diagrammatically illustrates a
sawing rig wherein there is a reciprocating platform or
carriage 10 set on rails 12 resting on a floor or other
suitable‘ foundation so that the platform can be recipro
cated along therrails to carry a log 14 past the large
and frames 24 in their adjusted positions.
'
Means are provided as, for example, a foot treadle
48 for releasing the pawls so that the frames 24 can be
moved to retracted positions when a new log is to be
placed in the saw mill.
According to the present invention a novel automatic
adjusting mechanism is provided which takes the form
circular saw blade 16 and ‘by which the log is cut so that 65 of a second gear~like member 50 mounted on ‘shaft 34
3,082,083
4
in spaced relation with the previously referred to member
46. There is also provided a lever 52 which is adapted
for actuation about the axis of shaft 34 and which spans
member '50. A pawl 54, best seen in FIGURES 2 and 5
is carried by lever 52 so as to be engageable with the
periphery of gear-like member 50. Member 50 and pawl
54 thus form a ratchet mechanism which will drive shaft
34 in one direction only.
The treadle 48 is so arranged that the operation thereof
will withdraw pawl ‘54 from the periphery of member 50
at the same time that the pawl pertaining to lever 44 is
withdrawn from the periphery of member 50 and at which
time any latch pawls engaging the members are also with
drawn thereby leaving shaft 34 free for rotation in the
view it will be noted that there is a ‘motor 100 which
drives a hydraulic pump 102 having its suction side con
nected to reservoir 104 and its discharge side connected
to a pressure conduit 106 leading to the inlet of a revers
ing valve 108 and to the inlet of a pilot valve 110.
Pilot valve 110 is biased in one direction by a spring
112 and when under the in?uence of spring 112 it directs
pilot ?uid to the end of valve 108 that causes shifting
thereof into position to interrupt the supply of pressure
?uid to conduit 68 and instead to connect conduit 68
to exhaust conduit 114. When solenoid S1 pertaining to
the pilot valve 110 is energized the pilot valve shifts and
directs ?uid to the opposite end of reversing valve 108
so that reversing valve 108 shifts and again supplies ?uid
opposite direction.
under pressure to conduit 68. Energization of solenoid
According to the present invention lever 52 is oscillated
by the combination of a single acting ?uid motor and
a return spring. This motor comprises a cylinder 56 piv
otally supported at 58 at the end opposite lever 52. A
S1 is accomplished by closing of a relay R1. The operat
ing coil for relay R1 has one side connected by wire {116
to power line L1 while the other side is connected by wire
piston or ram having a rod portion 60 is mounted in the ‘
cylinder and the rod portion 60 is pivoted at 62 to the
upper end of lever 52. Springs 64 are connected be
tween the upper end of lever 52 and a stationary point 66
' adjacent the back end of cylinder 56.
It will be evident that a supply of pressure ?uid to
the left end of cylinder ‘66 via conduit 68 will cause right
ward movement of rod 60 and this will bring about clock
wise movement of lever 52 about the axis of shaft 34
118 to one side of each of the several cam controlled limit
switches 86 associated with the several earns 84 mounted
on shaft 74 that rotates as the ?uid motor reciprocates.
The other side of each switch 86 is connected through
a normally open push button 120 with the other side
of the line which is indicated L2. It will be evident that
closing of any of the switches 120 will be accompanied
by the completing of a circuit through the operating coil
of relay R1 whereby the relay will close thus causing
shifting of the pilot valve 110 which in turn will cause
shifting of reversing valve 108 to actuate the ?uid motor
this will also drive shaft 34 clockwise and cause frames 30 so that the movable portion as represented by rod 60
24 to be adjusted toward saw blade 16. Upon release
will move rightwardly thus causing actuation of shaft
whereby pawl 54 will drive member '50 clockwise and
of pressure from the left end of cylinder 56, springs 64
34. Simultaneously, rack 78 moves rightwardly and this
will cause return movement of rod 60 and lever 52 to
causes rotation of gear 76 and shaft 74 and the earns
84 mounted thereon until the cam 84 pertaining to the
their starting position which is indicated in FIGURE 2.
The control of the movement of rod 60 is accomplished
by a plurality of limit switches and adjustable cams
mounted within a control box 70. The box 70 is sup
; limit switch 86 that is in circuit with the one of the push
buttons 120 which is closed opens the said limit switch.
At this time relay R1 will drop out, the push button will
be released, and the ?uid motor will return under the
in?uence of springs 64 to its starting position.
thereof is a shaft 74 to which is ?xed a gear 76. Gear 76 40
Due to the relatively light weight and slow speed of
extends through a slot in the bottom wall of the control
movement of the automatic set adjusting mechanism,
ported as by being welded to the end part 72 of cylinder
56. Within the control box and extending transversely
box so as to mesh with a rack 78 that is attached to rod
60 as by being welded by a block 80 which in turn is
there is no tendency for the adjusting mechanism to over
run the point at which the controlling cam engages its
welded to a collar 82 ?xed to rod 60.
limit switch and, accordingly, very precise control of
The rack 78 rides in a slot provided in end member 45 the set mechanism can be had by using the device of the
7 72 of the cylinder so that as rod 60 reciprocates the rack
78 will reciprocate therewith and cause rotation of gear
76 and the shaft 74 on which it is mounted.
present invention.
The push buttons 120 may advantageously be mounted
on a panel 122 (FIGURES 1 and 2) or the like which
may be supported by bracket means 124 on control box
which are preferably attached to the shaft by means of set 50 70. This will locate the svwltches where they are readily
screws so that they can be adjusted angularly. Pertain
convenient to the operator of the saw rig when the plat
ing to each cam 84 is'a limit switch 86. At this point it
form 10 is in its fully retracted position.
will be evident that by angularly adjusting the earns 84
Reference to FIGURES 1 and 2 will show that the
on the shaft 74 the cams can be caused to engage the re
structure of the present invention is of a unitary nature
Also mounted on the shaft are a plurality of earns 84
spective limit switches at any desired point in the travel 55 with all parts thereof, except the lever 52, pawl 54 car
of rod 60 in its rightward direction. This, in turn, pre
ried thereby and member 50, mounted on a base mem
determines the swinging movement of lever ‘52 and thus
ber 126 which can be attached to platform 10 as by bolts
predetermines the adjustment of member 50 and shaft 34
or cap screws 128. This platform carries the supporting
and the movement of the log supporting table consisting
of the frames 24. The cams and limit switches thus pro 80 structure 130 to which springs 64 are anchored and to
which the end of the ?uid motor is pivoted. The motor
~ vide means for controlling the adjustment of the set mech
anism of the sawing rig.
At this point it might be observed that an indicator is
provided for indicating the position of the log supporting
table and the amount of adjustment thereof whereby in
dications can be had of the position of the log and the
size of the boards cut therefrom.
This indicator takes the form of a dial 90‘ (FIGURE 2)
over which a pointer 92 sweeps. Pointer 92 is mounted
on a shaft carrying a sprocket which is connected by
a chain 94 with a sprocket on shaft 34. By this arrange
position making it quite convenient to connect the pump
with the reservoir and also preventing any air from get
ting into the hydraulic lines. At the back of base 126
there may be provided uprights 132 that support a panel
134 carrying switch box 136 in which the relay R1 re
ferred to above as well as other electrical components,
such as line switches and the like can be mounted.
By providing the base member 126 and supporting
the components of the structure of the present invention
thereon, it becomes a simple matter to adapt the device
shaft 34.
of the present invention to existing equipment. For this
Turning now to FIGURE 5, this view illustrates the
control circuit for the described arrangement. In this 75 reason it is proposed that the device he produced not
ment pointer 92 W"l always indicate the position of
»
100 and pump 102 are mounted on this platform and
the reservoir 104 is carried on the platform in elevated
assists
5
. .
only for incorporation in new manufacture but also for
use with saw rigs already in operation.
7
It will be understood that‘this invention is susceptible
4. In a device for adjusting the set mechanism of a saw
conditions and, accordingly, itpis desired to comprehend
such modi?cations within this“ invention as may ‘fall with
ing rig, said set mechanism comprising an oscillating arm
effective to adjust the rig in one direction of movement
only; a base member, a ?uid motor connected between the
base member and said arm for actuating the arm in its op
in the scope of the appended claims.
We claim:
1. In a control system for a sawing rig having a re
ciprocating platform, log supporting knees laterally 10
the
the
the
the
opposite direction independently of the knees; a recipro
cating ‘hydraulic motor connected with the lever ener
,
the pertaining one of said limit switches by‘ said cams.
to modi?cation in order to adapt it to different usages and ‘
movable on the platform, and a swingable lever on
platform connected with the knees so movement of
lever in one direction will adjust the position of
knees on the platform while said lever will move in
6
said cams, and means for rotating said ‘shaft in unison
with movements of said ram for sequential actuation of
posite directions,‘ a» reservoir for hydraulic ?uid‘ on the base
member, a hydraulic pump and a drive motor therefor on
the base member, conduit means forming a circuit between
the reservoir and the‘ pump and the ?uid motor, said cir
cuit including a valve for selectively connecting the ?uid
motor with the pump or with the reservoir, an electric op
15 erator for said valve and a control circuit for energizing
gizable for moving the lever in said one direction, a valve
movable to energize the motor, electric means energiz
able to move the valve, a plurality of manual switches
each operable when actuated to energize said electrical
means, and a limit switch pertaining to each manual
switch actuated by the motor during movement thereof
operable to make the pertaining manual switch inelfec
said operator, said control circuit comprising a plurality
of normally‘opened push button switches each closable to
energize the operator, a normally closed limit switch in
series with each push button switch, a cam for each limit
switch, a shaft adjustably mounting said cams, a gear on
the shaft, a rack meshing with the gear, and means con
meeting said rack for movement in unison with said arm
so that upon closing of a selected one of said push button
tive, said limit switches being arranged for sequential
switches, the ?uid motor will be energized to actuate the
actuation by said motor, said motor being continuously 25 arm until the pertaining one of said limit switches is actu
biased in the retracting direction so as to return auto
ated and opened by its cam, there being a spring biasing
matically upon actuation of the limit switch pertaining
said motor in the return direction.
5. In a device for adjusting the set mechanism of a
to the actuated one of said manual switches.
2. ‘In a control system for a sawing rig having a plat
sawing rig, said set mechanism comprising an oscillating
form, log supporting knees on the platform movable 30 arm effective to adjust the rig in one direction of move
transversely thereon, rack means on the knees, pinion
ment only; a base member, a ?uid motor connected be
means meshing with the rack means, a shaft on the plat
form on which the pinion means is carried so rotation
of the shaft will move the knees on the platform, a
ratchet wheel on the shaft, and an arm swingable on the 35
shaft having a pawl to drive the ratchet wheel in one di
rection of movement only of the arm; a cylinder car
ried by the platform, a ram in the cylinder connected
tween the base member and said arm for actuating the
arm in its opposite directions, a reservoir for hydraulic
?uid on the base member, a hydraulic pump and a drive
motor therefor on the base member, conduit means form
ing a circuit between the reservoir and ‘the pump and the
?uid motor, said circuit including a valve for selectively
connecting the ?uid motor with the pump or with the
reservoir, an electric operator for said valve and a con
to the arm, spring means urging the ram in one direction
in the cylinder, a ?uid pump, a valve connecting the pump 40 trol circuit for energizing said operator, said control cir~
to the cylinder normally positioned to exhaust the cyl~
inder, a solenoid for the valve energizable for shifting
cuit comprising a plurality of normally opened push but
shifted position where the cylinder is supplied with pres
energizing said operator, said control circuit comprising
a plurality of normally opened push button switches each
ton switches each closable to energize the operator, a
the valve to supply pressure to the cylinder to cause
normally closed limit switch in series with each push but~
the ram to move, a plurality of manual switches each
ton switch, a cam for each limit switch, a shaft adjustably
operable when closed to energize said solenoid, a nor 45 mounting said cams, a gear on the shaft, a rack meshing
mally closed limit switch in series with each manual
with the gear, and means connecting said rack for move
switch, a cam for each limit switch, a shaft adjustably
ment in unison with said arm so that upon closing of a
supporting said cam, a gear on the shaft, and a rack
selected one of said push button switches, the ?uid motor
meshing with the gear attached to the ram so closing of
will be energized to actuate the arm until the pertaining
any of the manual switches will be accompanied by move 50 one of said limit switches is actated and opened by its
ment of the ram and, therefore, of said knees until the
cam, spring means biasing said motor in the return direc
limit switch pertaining to the closed one of the manual
tion, there being a shaft comprising a portion of said set
switches is opened by its cam, said motor being continu
mechanism actuated by said arm, and. indicator means
ously biased in the retracting direction so as to return
for indicating the position occupied by the shaft.
automatically upon actuation of the limit switch pertain 55
6. In a device for adjusting the set mechanism of a saw
ing to the actuated one of said manual switches.
ing rig, said set mechanism comprising an oscillating arm
3. In a device for automatically actuating the set mech
effective to adjust the rig in one direction of movement
anism of a sawing rig, said mechanism including an arm
only; a base member, a ?uid motor connected between the
movable in one direction to adjust the rig and movable
base member and said arm for actuating the arm in its
idly in the other direction; a base member, a motor driven 60 opposite directions, a reservoir for hydraulic ?uid on the
pump on the base member, a cylinder connected to the
base member, a hydraulic pump and a drive motor there
base member, a ram in the cylinder connected to the said
for on the base member, conduit means forming a circuit
arm, spring means connected between the base member
between the reservoir and the pump and the ?uid motor,
and the ram biasing the ram in its retracting direction, a
said circuit including a valve for selectively connecting
valve connected between the pump and cylinder having a 65 the ?uid motor with the pump or with the reservoir, an
normal position where the cylinder is exhausted and a
electric operator for said valve and a control circuit for
sure from the pump, a solenoid operator for said valve, a
normally opened relay in circuit with said operator so that
closable to energize the operator, a normally closed limit
closing of the relay will energize the operator and shift the 70 switch in series with each push button switch, a cam for
valve, a plurality of energizing circuits connected in paral
each limit switch, a shaft adjustably mounting said earns,
lel and with said relay, each energizing circuit comprising
a gear on the shaft, a rack meshing with the gear, and
a normally open manually operated push button switch
means connecting said rack for movement in unison with
and normally closed limit switch in series therewith, a cam
said arm so that upon closing of a selected one of said
for each said limit switch, a shaft adjustably supporting 75 push button switches, the ?uid motor will be energized
3,032,083
8
7
751,405
796,925
807,636
1,543,218
1,611,058
2,613,703
2,707,501
2,893,448
to actuate the arm until the pertaining one of said limit
switches is actuated and opened by its cam, spring means
biasing said motor in the return direction, said sawing
rig comprising a reciprocating platform, said device being
mounted on said platform, there being a panel forming
a part of said device positioned so as to be accessible to
the operator with the platform in retracted position, and
said panel carrying said push button switches.
References Cited in the ?le of this patent
UNITED STATES PATENTS
157,679
Durkee _____________ __ Dec. 15, 1874
10'
Palmer ______________ _._ Feb. 2, 1904
McDermott ___________ __ Aug. 8, 1905
Niedermeyer _________ __ Dec. 19, 1905
Martin _____________ __ June 23,
Newson _____________ __ Dec. 14,
‘Calvert ____________ __ Oct. 14,
Craik ________________ __ May 3,
1925
1926
1952
1955
Elworthy ______________ __ July 7, 1959
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