U.S. patent number 3,884,345 [Application Number 05/330,715] was granted by the patent office on 1975-05-20 for apparatus for piling boards.
This patent grant is currently assigned to Rengo Co., Ltd. Invention is credited to Masateru Tokuno.
United States Patent |
3,884,345 |
Tokuno |
May 20, 1975 |
Apparatus for piling boards
Abstract
The present disclosure is directed to an apparatus for piling
up, up to a comparatively higher place, boards or their small
blocks which are successively fed, lying flatly. More particularly,
the board piling up apparatus comprises a vertically erecting
conveyer on which the boards are erected whose transporting face
extends downwardly to a transporting conveyer which sequentially
receives the boards erected on the erecting conveyer, and delivers
them to the discharging end, a reversing gear which rotates and
piles up the boards erected and arranged on the transporting
conveyer, and a discharging conveyer which discharges the boards,
stacked on the reversing gear, from the reversing gear.
Inventors: |
Tokuno; Masateru (Nishinomiya,
JA) |
Assignee: |
Rengo Co., Ltd (Osaka,
JA)
|
Family
ID: |
12202574 |
Appl.
No.: |
05/330,715 |
Filed: |
February 8, 1973 |
Foreign Application Priority Data
|
|
|
|
|
Mar 15, 1972 [JA] |
|
|
47-26772 |
|
Current U.S.
Class: |
198/403; 198/407;
198/431; 271/214; 414/789.2; 414/798.2 |
Current CPC
Class: |
B65H
31/06 (20130101); B65H 31/3081 (20130101); B65H
15/02 (20130101); B65H 31/3072 (20130101); B65H
2301/42265 (20130101); B65H 2701/176 (20130101); B65H
2701/1762 (20130101); B65H 2301/33214 (20130101) |
Current International
Class: |
B65H
31/06 (20060101); B65H 15/00 (20060101); B65H
15/02 (20060101); B65H 31/04 (20060101); B65H
31/30 (20060101); B65g 057/00 () |
Field of
Search: |
;198/33AD,82,237,35
;271/87,214 ;214/7,6B,6C |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Schacher; Richard A.
Assistant Examiner: Valenza; Joseph E.
Attorney, Agent or Firm: Stewart and Kolasch, Ltd.
Claims
What is claimed is:
1. An apparatus for stacking boards to a predetermined height which
comprises, in combination, a feeding conveyor for successively
introducing boards lying flat on said conveyor to the apparatus,
vertically erecting conveyor means on which the boards are
excitecd, extending downwardly from the feeding conveyor, a
transporting conveyor for receiving and transporting the erected
boards to the discharge end thereof, said transporting conveyor
being provided with a board reclining support associated therewith
near the end portion of the erecting conveyor for receiving and
holding the boards while they are being conveyed on the
transporting conveyor, a discharge conveyor for removing the boards
from the transporting conveyor, a reversing gear comprising an
L-shaped member rotatably disposed about the discharge end portion
of the transporting conveyor, said L-shaped member containing a
board erecting base and a board piling up base disposed at
substantially right angles with respect to each other and adapted
to be operatively cooperative with each other, said board erecting
base being rotatable from a recessed position below the
transporting conveyor to a substantially vertical position and said
board piling up base being simultaneously rotatable from a
substantially vertical position to a recessed position below the
discharge conveyor, and means for rotating the board erecting base
and the board piling up base.
2. The apparatus of claim 1, wherein the vertically erecting
conveyor means comprises conveyor belts which extend from the
feeding conveyor downwardly to the transporting conveyor.
3. The apparatus of claim 1, wherein an alignment plate is disposed
along the side of the erecting conveyor and exterior thereto, said
plate being movable in a direction perpendicular to the direction
of travel of the erecting conveyor for aligning the edges of the
vertically disposed boards.
4. The apparatus of claim 1, wherein the discharge conveyor
comprises substantially horizontally disposed endless conveyor
belts which are arranged to allow the board piling up base of the
reversing gear to be recessed below the conveyor belts, the feeding
end of the discharge conveyor being closely associated with the
discharge end of the transporting conveyor.
5. The apparatus of claim 1, wherein means are provided for
rotating the feeding conveyor, for rotating the vertically erecting
conveyor, for rotating the transporting conveyor and for rotating
the discharge conveyor.
6. The apparatus of claim 1, wherein more than one board reclining
support is associated with the transporting conveyor.
7. An apparatus for stacking boards which are successively fed to
said apparatus individually or in small stacks and in a flat
position which comprises a feeding conveyor including a roller
conveyor capable of feeding the boards or stacks of boards as they
are lying in said flat position, an erecting conveyor on which the
boards are erected including endless transporting belts provided in
parallel relationship, said transporting belts containing
transporting faces which are downwardly inclined, one end of said
belt being disposed under the discharge end of the feeding conveyor
so that the individual boards or small stacks thereof may be raised
by dropping from the feeding conveyor onto the erecting conveyor, a
transporting conveyor having endless transporting belts provided in
parallel relationship, the feeding end thereof being engaged with
the discharging end of the erecting conveyor so that the boards or
the stacks thereof in the raised-up position on the transporting
surface of the erecting conveyor may be received and transferred in
said raised position, said transporting belts containing board
reclining supports fixed thereto, said reclining supports
comprising an object supporting member slightly inclined towards
the direction of transportation, a reversing gear having a
fork-shape board erecting and aligning base, and a fork-shape board
piling-up stand connected thereto so as to form an L-shape
reversing gear, said reversing gear being rotatably connected to
the discharge end of the transporting conveyor at the point where
the board erecting base connects with the board piling-up stand,
said board erecting and aligning base being arranged with the
transporting conveyor so that the boards or the stacks of boards
being transported to the discharging end of the transporting
conveyor may be scooped up and rotated approximately 90.degree. to
stack the boards on the piling-up stand and a discharge conveyor
having endless transporting belt, the feeding ends of said
transporting belt being engaged with the discharging end of the
transporting conveyor so that the boards stacked by the reversing
gear may be received and transported, said board piling-up base and
said discharge conveyor being in parallel relationship so that the
board piling-up base may be recessed below the face of the
discharge conveyor.
8. The apparatus of claim 7, wherein a plurality of board reclining
supports are associated with the transporting conveyor, said board
reclining support being provided with wheels which engage guide
rods which are attached to said transporting conveyor, said board
reclining supports being continually conveyed from the discharge
end to the feed end of the transporting conveyor by the reversing
portion of said conveyor.
Description
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a board piling up apparatus which
can stack, to a desired height, the boards such as corrugated
boards, pasteboards, cardboards, etc..
Conventionally this type of operation for piling up the boards or
small stacks thereof which are successively fed slowly lying
flatly, has been perfomed manually. Accordingly, the operation has
been highly inefficient and thus it has been difficult to pile up
these boards to a desired height.
An object of the present invention is to provide a board piling up
apparatus wherein the boards or their small blocks which are
successively fed at a high speed, lying flatly are quickly stacked
into a desired comparatively high position and the stacked boards
are sequentially discharged.
Other objects of the present invention will become apparent from
the following full description of the present invention in
conjunction with preferred embodiments thereof and with particular
reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the
detailed description given hereinbelow and the accompanying
drawings which are given by way of illustration only, and thus are
not limitative of the present invention and wherein,
FIG. 1 is a side view of an apparatus, in accordance with the
present invention, wherein several parts thereof are removed or
broken away so as to clearly illustrate the entire apparatus of the
present invention, and the position of the driving means portion
thereof on each conveyer is displaced,
FIG. 2 is a plan of the apparatus, in accordance with the present
invention, wherein several parts thereof are removed or broken away
so as to clearly illustrate the entire apparatus of the present
invention,
FIG. 3 is a slant face view showing how a board reclining support
is provided on the chain conveyer with slats,
FIG. 4 is a slant face view of an alignment plate,
FIG. 5 is a slant face view showing a mechanism for adjusting the
position of a limit switch which determines the piling up height of
the boards, and
FIG. 6 is a view showing an electric control circuit of the
apparatus in accordance with the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to FIGS. 1 and 2, the board piling up apparatus is
composed of a vertically erecting conveyer 2 which receives the
boards from a feeding conveyer 1, a transporting conveyer 3, a
reversing gear 4 and a discharging conveyer 5.
The feeding conveyer 1 is such that several rollers 11, which are
arranged approximately in parallel are rotatably provided on a
roller supporting frame 12, and a guiding plate 13 is projected to
the end of the frame 12. Notches 131 and 131 through which board
reclining supports 32, (later described) can pass are provided in
the guiding plate 13. The guiding plate 13 is composed of an
approximately horizontal portion, and a portion which extends
downwardly, being curved from the horizontal portion.
The vertically erecting conveyer 2 is a belt conveyer whose
transporting face bends downwardly from below the tip end of the
guiding plate 13 on the feeding conveyor 1. The erecting conveyer 2
has several comparatively short endless belts 21, arranged in
parallel at proper intervals, and is entrained around feeding end
pulleys 22, and discharging end pulleys 23,. The feeding end
pulleys 22, are secured to a shaft 221, which is driven, through a
proper chain transmission gear 24 and a speed change gear 25, by a
motor 26.
The discharging end pulleys 23, are rotatably engaged with a shaft
30. An alignment plate 27 is arranged on the exterior side of the
vertically erecting conveyer 2. The alignment plate 27 is curved as
shown in FIG. 4, and rods 271 and 271 project from on the back face
of the alignment face 27. These rods 271 and 271 are engaged with a
support 272 so as to slide across the feeding direction of the
vertically erecting conveyer 2 and may be secured by a proper
setscrew 273 which is spirally engaged with the support 272.
The transporting conveyer 3 is composed of a pair of chain
conveyers 31 and 31 with slats which extend almost horizontally
from the discharging end of the vertically erecting conveyer 2, and
board reclining supports 32, which are supported by a pair of arms
which engage with each chain conveyer 31. Each chain conveyer 31
with slats has a slat 312 bridged fixedly to the respective mating
chain links of the parallel endless chains 311 and 311. The endless
chains 311 and 311 of each chain conveyer 31 with slats are
entrained around the feeding end sprockets 313 and 313, and the
discharging end sprockets 314 and 314. The feeding end sprockets
313 and 313 of each chain conveyer 31 with slats are secured to a
shaft 30 with which the discharging end pulleys 23, of the
vertically erecting conveyer 2 are engaged, while the discharging
end sprockets 314 and 314 are rotatably engaged with the shaft 40.
A strap member 315 made of a flexible material is provided on the
slats 312, of each chain conveyer 31 thereby preventing the boards
from being inserted between the slats 312 and 312 and from sliding
on the slats 312,. The shaft 30 to which the feeding end sprockets
313, are secured is driven, through a proper chain transmission
gear 33 and a speed change gear 34, by a motor 35.
A proper chain supporing member 316 is provided under the
transporting side portion of each chain 311 on each conveyor 31
thereby supporting the chain 311. Two board reclining supports 32
and 32 provided on each chain conveyer 31 with slats are mounted on
the chains 311 and 311 at an interval, which is almost one half of
the overall circumferential length of the chain 311. The two board
reclining supports 32 and 32 are arranged, in a direction across
the conveyer feeding direction, in said pair of chain conveyers 31
and 31.
As shown in FIG. 3, the mounting operation of each board reclining
support 32 into a chain 311 is conducted by engaging the lower end
of the board reclining support 32 with a chain pin. Four small
wheels 321, are rotatably mounted at the lowest end of each board
reclining support 32. When the board reclining support 32 provided
with four small wheels is placed on the chain conveyer 31, each
small wheel 321 is engaged between the upper and lower guiding rods
317 and 318, which are secured to the side face of each chain
supporting member 316 and rolls into contact with any one of the
guiding rods, thereby stabilizing the board reclining support 32.
When the board reclining support 32 is placed on the chain conveyer
31, an object supporting portion 322 (see FIG. 3) for the board
reclining support 32 is erected, with a forwardly tilting posture
in the conveyer feeding direction. The feeding speed of the
transporting conveyer 3 is almost as fast as that of the vertically
erecting conveyer 2. The reversing gear 4 is composed of a board
erecting base 41 which appears and disappears from the surface of
the transporting conveyer 3, and a board piling up base 42 which
appears and disappears from the surface of the discharging conveyer
5 (later described). The board erecting base 41 is fork-shaped and
its length is longer than the piling up height "H" (see FIG. 1) of
the boards stacked by the apparatus of the present invention. The
one side end 411 thereof is fixedly secured to a shaft 40 with
which the discharging end sprockets 314, of the transporting
conveyer 3 are engaged. The board piling up base 42 is also
fork-shaped and extends at almost a right angle to the base 41 from
the one side end 411 of the board erecting base 41. A fan-shaped
gear 43 is secured to the end of the shaft 40 and a pinion gear 44
is engaged with the gear 43. The pinion gear 44 is driven, through
a chain transmission gear 45 and a speed change gear 46, by a motor
47. The interlocking condition between the fan-shaped gear 43 and
the pinion gear 44 is set to allow the rotation from a posture,
where the board erecting base 41 is recessed from the transporting
conveyer 3 through the rotation of the pinion gear 44, to an
approximately vertical posture. and simultaneously from
approximately a vertical posture to a posture wherein the board
piling up base 42 is recessed into the discharging conveyer 5
(later described) through the rotating action of the base 41. The
discharging conveyer 5 is a chain conveyer with slats which extends
almost horizontally from the discharging end on the transporting
conveyer 3 and has three endless chains 51, 51 and 51 with slats
511, arranged in parallel in proper intervals. The discharging
conveyer 5 is entrained around the feeding end sprockets 52, 52 and
52, and around the discharging end sprockets 53, 53 and 53. The
feeding end sprockets 52, 52 and 52 are rotatably engaged with the
shaft 40, while the discharging end sprockets 53, 53 and 53 are
secured to the shaft 50. The shaft 50 is driven, through a proper
chain transmission gear 54 and a speed change gear 55, by a motor
56. A proper chain supporting member 57 is provided below the
transporting side portion of each endless chain 51 thereby
supporting the chain 51.
A limit switch for rotating and suspending the motor, which drives
each of said conveyors, at a proper time is arranged as
follows.
The limit switch 61 is provided between the endless belts 21 and 21
on the vertically erecting conveyer 2. The starting member 611 for
the limit switch 61 is composed of a curved leaf spring and is
provided on the vertically erecting conveyer 2. A limit switch 62
is placed between the chain conveyers 31 and 31 with slats on the
transporting conveyer 2, and placed so as not to interfere with the
reversing gear 4. As shown in FIG. 5, the switch 62 is secured to a
switch supporting member 71 which is provided with a female tapped
hole 711 and a notched groove 712, and a starting member 621, which
is in the form of a rod-shaped helical spring, is provided on the
transporting conveyer 3. The female tapped hole 711 of the switch
supporting member 71 is spirally engaged with the screw rod 72
which is rotatably provided in parallel with the feeding direction
of the transporting conveyer 3. The notched groove 712 is slidably
engaged with the guiding rod 73 which is parallel to the screw rod
72. A bevel gear 74 is secured to the end of the screw rod 72 and
another bevel gear 75 which is secured to a gear shaft 751 is
interlocked with the bevel gear 74. The bevel gear 75 is rotated by
operating a handle 76 which is secured to the shaft 751. A limit
switch 63 is secured, in a place near a shaft 40, to the board
erecting base 41 on the reversing gear 4, and its starting member
631 is provided on the board erecting base 41. A limit switch 64 is
placed in the lower portion of the discharging end of the
transporting conveyer 3. The starting member 641 of the switch 64
is provided on a passage for the board reclining supports 32 and
32, and is pushed by the other board reclining support 32 when one
board reclining support 32, which is located at the feeding end of
the transporting conveyer 3, is positioned in a place for receiving
the first board which is fed from the feeding conveyer 1. A limit
switch 65 is placed on the side of the discharging conveyer 5, and
its starting member 651 is pushed by the board piling up base 42 of
the reversing gear 4 which is recessed from the discharging
conveyer 5. A limit switch 66 is slidably engaged with a long hole
81 of a switch supporting rod 8 which is provided, facing the
conveyer feeding direction, between the endless chains 51 and 51 on
the discharging conveyer 5. The starting member 661 of the switch
66 is provided on the discharging conveyer 5. A limit switch 67 is
placed on the side of the transporting conveyer 3, and its starting
member 671 is pushed by the board erecting stand 41 of the
reversing gear 4 which is recessed from the transporting conveyer
3.
In FIG. 6 are shown electric control circuits of the apparatus in
accordance with the present invention. Referring now to FIG. 6, a
terminal R.S.T. is one for threephase AC power source connections.
NFB1 and NFB2 respectively show a breaker. A contact m12 is a
normally open contact (hereinafter referred to as A contact) for an
electromagnetic contactor M1 which drives and controls a motor 26
of the erecting conveyer 2. A contact m2 is an A contact for an
electromagnetic contactor M2 which drives and controls a motor 35
of the transporting conveyer 3. Contacts m33 and m43 are
respectively an A contact for a normally rotating electomagnetic
contactor M3 and a reversely rotating electromagnetic contactor M4,
which drive and control a motor 47 of the reversing gear 4. A
contact m52 is an A contact for an electromagnetic contactor M5
which drives and controls a motor 56 of the discharging conveyer 5.
Switches PB1, PB32, PB5 and PB7 are normally closed-circuit type of
push button switches which are opened respectively only when the
buttons are in a depressed position and are closed immediately when
the buttons are released. Switches PB2, PB31, PB4, PB6 and PB8 are
normally open circuit type of push button switches which are closed
respectively only when their buttons are in depressed position and
are opened immediately when the buttons are released. Switches S1
and S2 are respectively alternate types of switches which are
provided with a contact mechanism which retains the condition, once
it is set until an opposite action is taken. Switch PB31, switch
PB4 and switch PB6 operatively cooperate with switch PB32, switch
PB5 and switch PB7 respectively. Contacts e1, e2 and e3 are
respectively an A contact for a relay E. Contacts a1, a2, a3, a5,
a8 and a10 are respectively an A contact for a relay AX, which
contacts a4, a6, a7, a9 and all are respectively a normally closed
contact (hereinafter referred to as B contact) for the relay AX.
Contacts X1 and X2 are respectively an A contact for a relay X. A
contact m11 is an auxiliary A contact for the electromagnetic
contactor M1, and contacts m31 and m32 are respectively an
auxiliary A contact and an auxiliary B contact for the
electromagnetic contactor M3. Contacts m41 and m42 are respectively
an auxiliary A contact and an auxiliary B contact for the
electromagnetic contactor M4. A contact m51 is an auxiliary A
contact for the electromagnetic contactor M5. A contact t1 is a
delay A contact for a timer relay T1, contact t2 is a delay A
contact for a timer relay T2, and contact t3 is a delay A contact
for a timer relay T3. Contacts r11 and r12 are respectively an A
contact and a B contact for a relay R1. A contact r2 is an A
contact for a relay R2, while contacts r31 and r32 are respectively
an A contact and a B contact for a relay R3. LS61 is an A contact
for a limit switch 61, LS62 is an A contact for a limit switch 62,
LS63 is an A contact for a limit switch 63 and, LS64 is a B contact
for a limit switch 64. LS651 and LS652 are respectively a B contact
and an A contact for a limit switch 65 and cooperate operatively
with each other. LS66 is an A contact for a limit switch 66, and
LS67 is a B contact for a limit switch 67.
Described hereinafter is the board piling operation of the present
invention wherein board blocks are formed by stacking a plurality
of boards piled up by the apparatus described hereinabove. As a
preliminary operation, the switch supporting member 71 and the
limit switch 62 are moved in the feeding direction of the
transporting conveyer 3 by rotating a handle 76 thereby setting the
position of the switch 62 in accordance with the desired height for
piling up the boards. Also, the limit switch 66 is slide along a
long hole 81 of the switch supporting rod 8 to fixedly secure it in
a given position. The given location for the switch 66 is a place
where the board blocks 9, pass the switch 66 when the board blocks
9, which are fed for the discharging end of the discharging
conveyer 5, have reached the discharging end. In addition, one
board reclining support 32 is placed in the feeding end of the
transporting conveyer 3, while the other board reclining support 32
is put into a condition where the starting member 641 of the limit
switch 64 is pushed. Then, a preparation push botton switch PB2 is
pushed, as shown in FIG. 5, to excite a relay E thereby causing A
contacts e1, e2 and e3 to be closed. Also, an automatic change-over
switch S1 is closed and the relay AX is excited. Accordingly, A
contacts a1, a2, a3, a5, a8 and a10 are closed, while B contacts
a4, a6, a7, a9 are all opened. After such preparing operation has
been completed, the board blocks 9 which are fed from the front
process (not shown) and lying in a flat position are slid down at a
fast speed from the feeding conveyor 1 to the erecting conveyor 2.
Then, the board blocks or stacks 9 are raised up respectively
through the rotating movement of the rear end thereof with the
front end thereof in contact with the conveyor 2 as a base point,
and, are reclined against the board reclining support 32. Then, the
starting member 611 of the limit switch 61, which is provided on
the erecting conveyer 2, is pushed by the board block thereby
closing the contact LS61 of the switch 61. Accordingly, the
electromagnetic contactor M1 is excited and the contact m12 is
closed. Current is applied to the motor 26 which begins to drive
the erecting conveyer 2. Thus, the front end of the board block 9
which has come into contact with the erecting conveyor 2 is
transported to the board reclining support 32, while an operator
who stays outside of the erecting conveyor 2 erects the board block
9 and aligns the board block 9 against an alignment plate 27
provided on the opposite exterior side of of the erecting conveyor
2. When the board blocks 9 have been reclined closely against the
board reclining support 32, the delay A contact t1 for a timer
relay T1, which has begun to count upon closure of the contact LS61
of the limit switch 61, is closed thereby exciting the
electromagnetic contactor M2. Thus, the contact m2 is closed
thereby causing the current to be apply to the motor 35, whereby
the transporting conveyer 3 begins to operate. As the board block 9
leaves from the starting member 611 of the switch 61 upon the
rotation of the transporting conveyer 3, the contact LS61 of the
switch 61 is opened thereby suspending the erecting conveyer 2 and
the transporting conveyer 3. Accordingly, as the board blocks 9,
which are fed by the feeding conveyor 1 are sequentially erected
and reclined against the board blocks 9, the transporting conveyor
3 repeats its movement. Accordingly, the board reclining support 32
advances intermittently. Thus, when a given number of board blocks
9, have been erected on the transporting conveyer 3, the first
board block 9 reaches the starting member 621 of the limit switch
62 thereby pushing it. The contact LS62 of the switch 62 is closed
and the relay X is excited thereby closing the contacts X1 and X2.
The electromagnetic contactor M2 is excited upon closure of the
contact X2 thereby successively starting the operation of the
transporting conveyer 3. Since the first board block 9 reaches the
starting member 631 of the limit switch 63 thereby pushing it right
before reaching the discharging end of the transporting conveyer 3
by the sucessive operation of the transporting conveyer 3, the
contact LS63 of the switch 63 is closed thereby exciting the
electromagnetic contactor M3 and thus the contacts m31 and m33 are
closed. Current is applied to the motor 47 upon closure of the
contact m33 and the reversing gear 4 starts to normally rotate
(counter-clockwise in FIG. 1). When the board erecting base 41 of
the reversing gear 4 has shown up on the transporting conveyer 3,
the board blocks 9, are already on the base 41, and are piled up on
the board piling up base 42 by the rotation of the reversing gear
4. Since one board reclining support 32, against which the board
blocks 9, have been reclined during the rotating movement of the
reversing gear 4, reaches the starting member 641 of the limit
switch 64 thereby pushing it, the contact LS64 of the switch 64 is
opened thereby deenergizing the relay X, and the contacts X1 and X2
are opened. Upon opening of the contact X2, the electromagnetic
contactor M2 is deenergized and the transporting conveyer 3 is
suspeneded. When the conveyer 3 has been suspened as described
hereinabove, the other board reclining support 32 is located in the
feeding end of the conveyer 3 and is prepared for the subsequent
piling up operation. The board blocks 9, which have been piled up
on the board piling up base 42 by the rotating motion of the
reversing gear 4 are placed on the discharging coveyer 5 by
recessing the base 42 from the descharging conveyer 5.
The base 42 is recessed from the conveyer 5 and reaches the
starting member 651 of the limit switch 65 thereby pushing it.
Then, the B contact of the switch 65 is opened and simultaneously
the A contact LS652 is closed. Since the electromagnetic contactor
M3 is deenergized by opening the contact LS651, the reversing
conveyer 4 is suspeneded. Also, the delay contact t2 of the timer
relay T2 which has begun to count upon closure of the contact LS652
is closed after the board blocks 9, which were placed on the
discharging conveyer 5 have been stabilized. Since the
electromagnetic contactor M5 is excited upon closure of the contact
t2, the contacts m51 and m52 are closed. Accordingly, current is
applied to the motor 56 to cause the discharging conveyer 5 to
operate. Accordingly, the stacked board blocks 9, are fed to the
discharging end of the conveyer 5. The board blocks push the
starting member 661 of the limit switch 66 on the way to the
discharging end thereof and close the contact LS66 of the switch
66. As the relay R1 is excited by closure of the contact LS66, the
contact r11 is closed and the contact r12 is opened. The relay R2
is excited for self-holding by the closure of the contact r11. When
the board blocks 9, have reached the discharging end on the
discharging conveyer 5 and have past the limit switch 66, the delay
contact t3 of the timer relay T3, which has started to count upon
the excitation of the relay R2, is closed. Accordingly, the contact
LS66 of the limit switch 66 is opened at this time, and the relay
R1 is deenergized. Thus, the contact r12 is closed and the relay R3
is excited. Excitation of the relay R3 closes the contact r32
thereby deenergizing the electromagnetic contacter M5. Thus, the
discharging conveyer 5 is suspended and the contact r31 is closed
thereby exciting the electromagnetic contactor M4. The contact m43
is closed upon excitation of the electromagnetic contactor M4 and
thus the current is applied to the motor 47 causing the reversing
gear 4 to start to rotate reversely. When the board erecting base
41 of the reversing gear 4 is recessed from the transporting
conveyer 3 thereby pushing the starting member 671 of the limit
switch 67 to open the contact LS67 of the switch 67, the
electromagnetic contactor M4 is deenergized thereby suspending the
reversing conveyer 4 for the subsequent operation.
Thus the board blocks are quickly piled up into a desired height,
and the stacked board blocks are sequentially descharged.
Furthermore, by pushing the switch PB31 while the operation is
performed, the electromagnetic contactor M2 is excited in spite
opening and closing of the contacts X2 and t1, and thus the
transporting conveyer 3 is operated. Also, the electromagnetic
contact M1 is excited by closing the switch S2 when the switch S1
is in an opened position, and the erecting conveyer 2 is operated.
By depressing the switch PB4, when the switch S1 is in opened
position, the electromagnetic contactor M3 is excited, if the B
contact LS651 of the limit switch 65 is in a closed position while
the switch PB4 is continually being pushed, whereby the reversing
gear 4 is normally rotated. By depressing the switch PB6, the
electromagnetic contactor M4 is excited, if the B contact LS67 of
the limit switch 67 is in a closed position, while the switch PB6
is continually being pushed, whereby the reversing gear 4 is
rotated reversely. Furthermore, by depressing the switch PB8 when
the switch S1 is in an open position, the electromagnetic contactor
M5 is excited, and thus the discharging conveyer 5 is operated. By
depressing an emergency stop switch PB1, the relay E is deenergized
and the contacts e3 and e3 are opened. Since feeding is suspended
to of the entire control circuits, all the conveyers are
suspended.
The invention being thus described, it will be obvious that the
same may be varied in many ways. Such variations are not to be
regarded as a departure from the spirit and scope of the invention,
and all such modifications are intended to be included within the
scope of the following claims.
* * * * *