JPS5837333Y2 - Electric mobile shelf - Google Patents

Description

[Detailed description of the invention] The present invention relates to a safety device for an electric movable shelf, and in particular to a device for maintaining safety in the event that a power outage occurs in the state 11 when a movement command operation is performed and the power is restored. be.

In order to effectively utilize the limited space inside a library or other room, multiple shelves are arranged on rails laid on the floor so that they can move freely using electric power, and items can be placed between the desired shelves as needed. Electrically operated movable shelves with passages for loading and unloading are already known.

When a button is pressed on such conventional electric movable shelves, a command is issued to provide a passage between desired shelves.
After detecting the position of each column at that time, it is determined which shelf should be moved in which direction, and the movement of each column is electrically controlled accordingly.

In conventional electric movable shelves, in order to simplify the configuration of the command circuit that issues a command to form a passage between desired shelves, a passage formation command switch provided in each column is used to control the operating state. There is a type of switch that is self-holding.

In such conventional electric movable shelves, if a power outage occurs when a command is issued to create a passageway between shelves, and when the power is restored, the movable shelves will start traveling again in accordance with the command. .

This is not limited to the case of a power outage, but also applies when the main switch is turned on while the above command is issued.

However, it is not desirable from a safety standpoint if the movable shelf immediately starts running when the power is restored or the main switch is turned on.

This is because, for example, if a worker enters an aisle that is being narrowed during a power outage, and the power is restored in that state, there is a risk that the worker in the aisle will get stuck between the shelves. It is.

The present invention was made in consideration of these points, and
Four years ago, when a command was issued to form a passage between shelves in electric movable shelves, where the passage formation command switch installed in each column is a type of switch that self-maintains the operating state, even if the power outage is restored, Alternatively, the purpose is to ensure the safety of workers in the aisle by preventing the movable shelf from moving even if the main switch is turned on.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

In Figures 1 to 3, an appropriate number of rails 11, for example four, are laid in parallel on the floor of the room. Mobile shelf 1,
2 and 3 are driven by wheels (not shown) mounted on the bottom.
Moreover, it is mounted so that it can run freely in a direction perpendicular to the frontage of each column using a motor (not shown) as a power source.

A shelf 0 is fixed at the end of the rail 11 on the side of the movable shelf 1.

On the top plate of each column 0°1, 2, and 3 are electric lights OFL and IFL that are to illuminate the passage formed between the adjacent shelves.

A seesaw switch OC8 is provided on one side tube of one shelf 0, in which 2FL and 3FL are supported by appropriate arms, for instructing that a passage should be formed between shelves 0 and 1. Similarly, on one side of each column 1, 2゜3, there are shelves 1-
See-saw switches 1C8, 2C8 and 3C8 are provided for instructing that a passage be formed between the shelves 2, 2 and 3, and between the shelves 3 and a wall (not shown).

Each of these switches OC3, Te3.2C8, and 3C8 is a so-called illuminated switch, and as described later, when the switch is closed, the light bulbs OP, IP, 2P, and 3P (Fig. ).

Also, next to these switches in each column are the emergency stop switches OPB, IPB, 2PB, and 3P for the mobile shelves.
B is provided.

The movable shelves 1.2, 3 are each driven by a drive motor M1.2, which will be described later. It is assumed that M2 and M3 are built-in.

Each of the movable shelves 1, 2, and 3 has an appropriate number of shelves for placing articles on both the front and back surfaces, and an example of shelf 1 is shown in FIG. 3 on the rain opening surface of each of these movable shelves. An appropriate number of foreign object detection switches 11 LS t 12 LS,"...1 nL are written on the front end surface of the shelf board and the front end surface of the shelf base at an appropriate height so that the height is
S is provided.

Similarly, foreign object detection switches 21LS to 2nLS are placed on the rain openings of the other shelves 2 and 3.

It is assumed that 31LS to 3nLS (see FIG. 6) are provided.

Each of these foreign object detection switches is linked to a detection plate that is pressable in the depth direction of the shelf and supported in the horizontal direction.

It is assumed that most of the control electrical equipment, which will be described later, is housed in a proper location of the stationary shelf 0, for example, within the double-walled side wall, and a control signal communication line 12 from this control unit to each movable shelf is provided. , 13, 14 are arms 5, 16, 1γ, 1B supported swingably in a horizontal plane on the top plate of each column.
, 19, 20.

Next, examples of electric circuits used in the present invention will be explained with reference to FIGS. 4 to 7.

In Figure 4, the AC commercial power supply 21 is connected to the main switch 32.
It is led in by electric circuits R and S through the circuit.

A series branch line consisting of the fuse 22 and the primary winding of the drop-down E transformer 23 is connected to this electric line R2S.

The secondary winding of the transformer 23 is connected to the input terminal of a rectifier circuit 24, and the output terminal of the rectifier circuit 24 is connected to the electric line B-'B+ through a smoothing circuit consisting of a parallel connection of a capacitor C and a resistor R1.
The button is connected to the button, and low voltage (
For example, a DC voltage of 24 cm) is extracted.

The electric circuit R is connected to a common terminal of a motor M1 for driving the movable shelf 1 via a fuse 25 and a normally open contact 1M1 of a relay IM (see FIG. 6), and the normal rotation terminal of the motor M1 is connected to the relay IR ( (see Figure 6) and the normally open contact IM2 of the relay 1M. Connection point of M2 and TR2 beam L/-IR
The capacitor C1 is connected to the reverse rotation terminal of the motor M1 through the normally open contact IR1 of the motor M1.

Similarly, the electric circuit R is connected to the common terminal of the movable shelf 2 driving motor M2 via the fuse 26 and the contact 2M1 of the relay 2M, and the normal rotation terminal of the motor M2 is connected to the contact 2R2 of the relay 2R and the contact 2M1 of the relay 2M. 2M2, and the connection point between relay contacts 2M2 and 2R2 is connected to the reverse rotation terminal of motor M2 through contact 2R1 of relay 2R, and between the forward rotation terminal and reverse rotation terminal of motor M2. A capacitor C2 is connected to the capacitor C2.

In the past, between electrical circuits R and S, fuse 2T, relay 3M contact 3M1.3M2, relay 3R contact 3R1,
The circuit consisting of the 3R2 button and capacitor C3 is connected like the above case.

From these electric lines R and S to the motor Ml. M2. The circuit leading to M3 is referred to as a motor drive circuit 80.

A main power indicator WL is connected between the electric circuits R and S as shown in Fig. 5, and a normally open contact OA4 of the relay OA (see Fig. 6) and the above-mentioned illumination lamp OF'L are connected. A series branch between the normally open contact IA4 of the relay IA and the illumination lamp IFL, a series branch between the normally open contact 2A4 of the relay 2A and the illumination lamp 2FL.
series branch with normally open contact 3A4 of relay 3A and illumination light 3
The series branches with FL are respectively connected.

Further, the electric line R is connected to one of the normally open contacts 1M3, 2M3, and 3M3 of each of the relays IM, 2M, and 3M, and the electric line S is connected to the above-mentioned contacts 1M3 and 2M via the chime CH.
3, 3M3 is connected to each other contact point.

The circuit portion shown in FIG. 5 is referred to as a lighting/warning circuit 100.

A timer TA is connected between the electric lines B1 and B+ as shown in FIG.

The timer TA is closed in a normal state, that is, when no electricity is applied,
Further, it has a contact TA1 that opens after being kept closed for a relatively short period of time after being energized.

A series branch circuit consisting of the contact TA1 of the timer, the normally open contact OA2 of the relay OA, and the relay AX is connected between the -+ electric circuits B and B.

The contact TA1 of the above timer is the normally open contact A of the relay AX.
X1 is connected in parallel, and relay IA is connected to the relay contact OA2.

2A, 3A normally open contacts I A2 t 2A213A2
are connected in parallel.

Backflow prevention diodes DI and D2 are connected in parallel to the timer TA and the relay AX, respectively.

A portion consisting of these timer relay circles and relay contacts constitutes a power failure countermeasure circuit 30.

- Between the ten electric circuits B and B, a series branch line between the seesaw switch OC8 and the relay OA, a series branch line between the seesaw switch 1C8 and the relay 1A, a series branch line between the seesaw switch 2C8 and the relay 2A, and a seesaw switch 3
The series branches of C8 and relay 3A are connected, respectively.

The above-mentioned relay OA is connected in parallel with the light bulb OP and diode D3 that illuminate the seesaw switch OC8 from inside, and similarly, one relay is connected with a light bulb 1P and a diode D.
4, a light bulb 2P and a diode D5 are connected in parallel to the two relays, and a light bulb 3P and a diode D6 are connected in parallel to the relay 3A.

A portion consisting of each of these relays and each seesaw switch constitutes a command circuit 40.

Circuit B is connected to circuit B via normally closed contact AX2 of relay AX.
connected to a.

Between this electric circuit Ba and electric circuit B, relays 3B and 2B are connected.
, each normally closed contact 3B3.283 of IB, a series branch button consisting of IB3, normally open contacts OAt of relay OA, and relay OB, normally open contacts 3A1 of relay 3A, relay 3B, and relay 28. IB, OR normally closed contacts 2B2゜182.082
The series branches consisting of and are connected.

A series branch consisting of normally open contact IA1 of relay 1A and relay 1B is connected between the connection point of relay contacts IB3 and 283 and the connection point of relay contacts OB2 and IB2, and the connection of relay contacts 2B3 and 383 is connected. Normally open contact 2A1 of relay 2A is connected between the point and the connection point of relay contacts IB2 and 282.
A series branch consisting of and relay 2B is connected.

In addition, each relay OB, IB, 2B, and 3B has a diode D7. 'D8. D9. D1o are connected in parallel.

A portion consisting of each of these relays and each relay contact constitutes a selection circuit 50.

A series branch line consisting of a normally open contact DX1 of a relay DX and a timer TC is connected between the electric line B and the electric line Ba.

The timer TC has contacts TC1 and Te3 that are closed for a certain period of time when energized, and a series branch consisting of the timer contact TC1 and another timer TD is connected between the electric lines B and Ba.

The above relay contact DX1 has an auxiliary push button switch AUPB1.
However, the diode Dll is in the timer TC, and the diode Dll is in the timer T.
A relay CX and diodes D1° and D13 are connected in parallel to D.

The timer TD has a contact TDI that is normally open and a contact TD2 that is normally closed when pressed, and each of these contacts closes or opens for a relatively short period of time, for example, 1 second, when the timer TD is energized. It looks like this.

Between the electric circuits B and Ba, there is also a normally open contact O of the relay OA.
A3 and timer contact TC2 and timer TB contact TBt
A series branch consisting of timer contact TD2, normally closed contact EX1 of relay EX, and relay BX is connected, and a series branch consisting of relay contact OA3, normally open contact DX4 of relay DX, and relay DX is connected.
The series branches consisting of and are connected.

The relay contact OA3 includes relays IA and 2A.

Each normally open contact 1A3, 2A3, 3A3 of 3A is connected in parallel, the normally closed contact DX3 of relay DX is connected in parallel to timer contact TC2, the connection point of timer contacts TBt and Te3, relay contact EX1 and timer contact, aT D 2 A series branch consisting of an auxiliary pushbutton switch AUPB2 and a timer contact TD1 is connected to the connection point of each movable shelf 1,
Foreign object detection switches 11LS to ?2 and 3? nLS
, 21LS to 2nLS, and 31LS to 3nLS are connected in parallel.

In addition, a diode D14 is connected to the relay BX, and a diode D14 is connected to the relay DX.
An indicator light LO and a diode D15 are each connected in parallel.

Inside, auxiliary pushbutton switches AUPB 1 and AUP B 2
are linked.

Each relay contact OA3. IA3 etc. and each foreign object detection switch 1
A series branch consisting of the normally closed contact DX2 of the relay DX and the timer TB is connected between the connection point with the 1LS to 1 nLS, etc. and the electric line B, and the timer TB has a diode.
)”D16 are connected in parallel.

The timer TB has the contact TBI that opens after a certain period of time, for example 20 seconds, after energization.

A portion including each of these timers, a foreign object detection switch, etc. constitutes a foreign object detection control circuit 60.

In addition, relay contact OA 3 * I A3 etc. and switch 1
A relay EX is connected between the connection point with 1LS etc. and electric line B.
and its normally open contact EX2 are connected, and push button switches OPB and IPB are connected to the relay contact EX2.
, 2PB, and 3PB (see FIG. 1) are connected in parallel, and a diode D17 is connected in parallel to the relay EX.

A portion including these push button switches constitutes an emergency stop circuit 90.

After the electric circuit Ba passes through the normally open contact BXt of the relay BX,
Each normally open contact of relay OB, IB, 2B, 3B 081 t
Electric circuit B via I B1, 2Bt y3B1, respectively
o, Bt? 82, which is branched into B3.

Between electric circuits Bo and B, there is a series branch circuit consisting of diode D24, normally closed contact ILt of relay 1L, diode D25, and relay 1M, and a series branch circuit consisting of diode D24, normally closed contact 2L2 of relay 2L, diode D33, and relay 2M. and the series branch consisting of the diode D38.
and normally closed contact 3L3 of relay 3L and diode D41
and relay 3M are connected to each other.

Between the electric circuits B1 and B, there is a diode D28, a normally closed contact OL1 of the relay OL, and a normally closed contact CX2 of the relay CX.
and relay 1R, and diode D32.
A series branch circuit consisting of the normally closed contact 3L2 of the relay 3L, the diode D34, the normally open contact CX3 of the relay CX, and the relay 2R is connected.

Between electric circuits B2 and B, there are diode D36, normally closed contact OL2 of relay OL, and normally closed contact CX4 of relay CX.
A series branch consisting of and relay 2R is connected.

Furthermore, a diode D45 is connected between the electric circuits B3 and B.
A series branch circuit consisting of the normally closed contact OL3 of the relay OL, the normally closed contact CX6 of the relay CX, and the relay 3R is connected.

The relay contact IL1 has a relay 2L. The normally closed contacts 2L1 and 3L1 of 3L are connected in parallel, and the connection point between each of these contacts and the diode D25 is the diode 26.
and is connected to the connection point between relay IR and relay contact CX2 via normally open contact CX1 of relay CX.

The connection point between diode D25 and relay 1M is connected between relay contacts CX2 and OLl via diode D27.

The connection point between the diode D2s and the relay contact OLI is connected to the electric line B2 via the diode D29 and to the electric line B3 via the diode D30.

The relay contact 3L2 is connected in parallel to the relay contact 2L2.

The connection point between diode D33 and relay 2M is connected between relay contacts OL2 and CX4 via diode D35.

The normally closed contact IL2 of the relay 1L is connected in parallel to the relay contact OL2, and the connection point between the relay contact IL2 and OL,2 is connected to the electric line B3 via a diode D37.

The connection point between the diode D3g and the relay contact 3L3 is connected to the electric line B1 via the diode D39 and to the electric line B2 via the diode D40.

The connection point between relay contact 3L3 and diode D4t is connected to the connection point between relay 3R and relay contact CX6 via a series branch of diode D42 and normally open contact CX5 of relay CX.

Relay contact OL3 has normally closed contacts I of relays 1L and 2L.
L3 and 2L3 are connected in parallel.

Each relay IM, IR, 2M, 2R, 3M, and 3R has a diode D18. D19. D2o, D2□
.

B22 and B23 are connected in parallel.

Each of these relays, relay contact buttons and electrical circuits Bo and Bl
, B2° and B3 constitute a motor control circuit 70.

+ Between the electrical circuits B and B, as shown in FIG. A series branch of the branch, limit switch 3LS and relay 3L is connected.

The limit switch OLS is connected to the movable shelf 1 shown in FIG.
The limit switch ILS closes when the movable shelf 1 moves to the left and overlaps the stationary side 0, and the limit switch ILS closes when the movable shelf 1 moves to the right at the movement limit 1. and 3LS close when movable shelves 2 and 3 move to their respective rightward movement limits.

Diodes D46, B47, tD48, and fD49 are connected in parallel to each of the relays OL, IL, 2L, and 3L, respectively.

As each of the above limit switches, microswitches, magnetically sensitive switches, optically sensitive switches, and other types of switches can be used.

A circuit including these limit switches and relays constitutes a limit switch circuit 110.

Next, the operation of the embodiment of the present invention configured as described above will be explained.

Now, when the main switch 32 (see Fig. 4) is turned on, commercial AC power is applied between electric circuits R and 8, and the indicator lamp WL (see Fig. 4) is turned on.
(see FIG. 5) lights up, and a DC power supply of a predetermined voltage is applied between the electric lines B- and B+.

After a certain period of time has elapsed after energization, the timer TA is activated and the contact TA1 is opened.

Assuming that each movable shelf 1, 2, and 3 moves to the left in Fig. 1 and overlaps with the stationary side 0, only the limit switch 0LS (see Fig. 7) closes and the other Limit switches ILS, 2LS, 3LS are open.

Therefore, relay OL is energized and its contact OL 150
L 2 ) OL3 opens.

From this state, for example, the stationary side 0 and the movable shelf 1
When attempting to form a passage for taking articles in and out between the two, close the saw switch OC8 on the stationary side 0.

This energizes the relay OA, and the light bulb OP
lights up and illuminates the seesaw switch OC8 from inside.

By energizing relay OA, its contact OAI % OA2
t OA3 t OA4 closes.

Even if the contact OA2 closes, the timer contact TAI is already open as described above, so the relay AX is not energized, and the contact AX2 has been closed for a while.

Then, when the relay contact OA1 is closed, the relay contact 3
B3゜283 tIB310AI, current flows through the closed circuit consisting of relay OB, and relay (7B) is energized, closing its contact OB1 and opening contact OB2.

By opening this contact OB2, the other relays 18, 28, 3B in the selection circuit 50 are not activated.

When the relay contact OA3 closes, the same contact OA3
, a current flows through the branch path consisting of relay contact DX3, timer contacts TBI, TD2, relay contact EXI, and relay BX,
Relay BX is energized.

This closes the relay contact BXI, and as a result, the electric line Bo is connected to the electric line B through the already closed relay contact OBI+ as described above.

Therefore, from the electric line Bo, the electric line B is connected via the diode D24, the relay contact 1L1, the diode D25, and the relay 1M.
Current flows through circuit B.

A current flows from the diode D3t, the relay contact 2L2, the diode D33, and the relay 2M to the circuit B.
Also, from the electric circuit Bo, the diode D3s, the relay contact 3L
3. A current flows through the electric circuit B through the diode D41 and the relay 3M, and the relays 1M, 2M, and 3M are excited, respectively.

When these relays are energized, each contact IM1.1M2.
1M3.

2M1 t 2M2 t 2M3.3Mt , 3M2.
3M3 is closed, and motors Ml and M2゜M are connected from electric circuits R and S.
Power is supplied to the forward rotation circuit of No. 3 (see Figure 4), and each motor rotates forward to move the movable shelves 1, 2, and 3 to the right in Figure 1, and move them to the stationary side 0. Create a passage between it and shelf 1.

The illumination lamp OFL located on this passage is turned on when the relay contact 0A4 (see FIG. 5) is closed, and illuminates the passage for convenience of work.

When the movable shelf 1 starts traveling as described above, the limit switch OLS opens and excitation of the relay OL is cut off, and when the movable shelves 1, 2, and 3 begin traveling at the travel limit 1, the limit switch ILS opens.

2LS and 3LS are closed, and each relay IL and 2L.

3L (see FIG. 7) is excited.

Each relay IL. Contact IL1t is activated by excitation of 2L and 3L.
IL2tIL3.2Lt t 2L2.2L3 t 3
Lt, 3L23L3 opens, and the respective relays IM, 2M
.

Even if the other seesaw switch IC8, 2C8 or 3C8 is closed and the relay IA, 2A or 3A is energized while the seesaw switch OcS is closed, the selection circuit 50 selects the seesaw switch OC8 as described above.
Since circuits other than those related to this are cut, there will be no malfunction.

Next, when attempting to form a passage between fixed shelf a and movable shelf 1, for example, between fixed shelf a and movable shelf 1 as described above, After opening the seesaw switch OC8, the seesaw switch 1C8 on the movable shelf 1 is closed.

This energizes relay 1, closing its contact IAI, and energizing relay 1B, closing its contact I B 2 t.
IB3 opens.

Then, contact IA3 of relay 1A closes, relay BX is energized, and its contact BXI closes.

Since the contact IB1 is closed by the excitation of the relay 1B, the electric line B1 is connected to the electric line +B, and a current flows from this electric line B1 through the diode D2g, the relay contact OL 1 t CX 2, and the relay IR. As the current flows, the diode D
27, the current flows to relay 1M, and relay 1
R and 1M are excited.

The excitation circuits of other relays 2M, 2R, and 3M are connected to the electric circuit B1, but as mentioned above, the limit switch ILS
As a result of 2LS and 3LS being closed, relay contacts 2L2.
Since 3L2.3L3 is open, relays 2M, 2R,
3M is not energized.

When relay 1R is energized, its contact 1R1 closes and the IR
2 opens, and when relay 1M is energized, its contact I
M1. Since IM2 is closed, the reverse circuit of motor M1 is closed, causing movable shelf 1 to travel in the opposite direction, that is, to the left in FIG. 1, and +! A passage is formed between AI and 2.

When the shelf 1 travels in this manner, the limit switch ILS returns to its original state, and when the shelf 1 travels past the travel limit, the limit switch OLS closes, energizing the relay OL and opening its contacts OL1゜OL2tOL3. open, cut off the excitation of relays IM and IR, and close their contacts IMt t 1
M2 j IRI and IR2 are returned to their original states, motor M1 is stopped, and movement of movable shelf 10 is stopped.

When the relay 1A is energized, its contact IA4 is closed, and the illumination lamp IFL is turned on to illuminate the passage.

In addition, while any mobile shelf is running, relays IM, 2M,
Since any one of the 3Ms is energized, the chime CH in the lighting/warning circuit 100 issues an alarm.

By the way, moving the movable shelves to create passages between predetermined shelves will gradually narrow the passages that existed in the past, so there may be workers or other foreign objects in the passages that are being narrowed. If there is, it is necessary to stop the movement of the shelves to ensure the safety of workers and remove foreign objects.

Therefore, in that case, the push button switch O provided in each column
P.B.

Press one of IPB, 2PB, and 3PB.

While the movable shelf is running, relay contact OA3 t IA3, 2A
Since one of the 3°3A3 is in the closed state, by pressing the push button switch, the relay EX is energized and self-held by its contact EXz.

Then, since the contact EXx is opened by the excitation of the relay EX, the excitation of the relay BX is cut off and the contact BXl is opened, and the motor control circuit 70 and motor drive circuit 80 connected after this contact return to their original states. , the motor stops and the movement of the shelf also stops at that point.

In order to return this emergency stop circuit 90 to its original state, after releasing the pressure on the stop button switch, press the seesaw switch OC8.
The switches 3C8 to 3C8 that are in the closed state are opened, and all contacts OA3 to 3A3 are opened to release the self-holding state of the relay EX.

In order to restart the movement of the movable shelf, the user must close the seesaw switch again by operating the seesaw switch.

Further, if the movable shelf is run without knowing that there is a worker or other foreign object in the passage between the shelves, the foreign object detection switches 11LS to 1nLS provided on the frontage surface of the moving movable shelf.

One of 21LS to 2nLSt and 31LS to 3nLS touches a worker or a foreign object in the passage and is closed.

While the shelf is running, relay contact OA3゜IA3, 2A3.3A
3 is in the closed state, relay D is connected via this closed relay contact and the foreign object detection switch.
X is energized, and its contacts DX1. Close DX4 and contact D
Open X 2 tDX3.

When relay contact DX4 closes, relay DX is self-held.

When the relay contact DX1 is closed, the timer TC is energized and the tie contacts TCt and TC2 are closed for a certain period of time.

This energizes another timer TD, and its contact T
D2 is open for about 1 second, during which time the excitation circuit of relay BX is opened and its relay contact BX1 is opened, so that the O current is cut off to the motor control circuit 70 and further to the motor drive circuit 80, and the movement of the shelf is temporarily stopped.

After the movement of the shelf stops for about 1 second, contact TD2 of timer TD returns to its original state, so relay contacts OA3 to OA3
one of A3, timer contact TC2, timer contact TB1, timer contact TD2, and relay contact EX1.
Relay BX is energized via and closes its contact BXI.

Furthermore, by closing timer contact TCI, relay C
X is energized and its respective normally open contacts CX1, CX3°CX5
Close the normally closed contacts CX2 t CX4 ) and open the normally closed contacts CX6.

Such an operation may occur, for example, as described above in the relay IM,
2M and 3M are energized and shelves 1, 2, and 3 are traveling to the right as shown in FIG. 1, and a passage is being formed between shelves 0 and 1. After 2 and 3 stop for about 1 second, contacts CX1 + CX3,
Relays IR, 2R, and 3R are excited via CX5, and their contacts IR1 and IR2>2Rt and 2R2t 3Rt and 3
Since R2 switches and the drive circuits of the motors Ml, Mz, and M3 switch to reverse drive circuits, the movable shelf starts running in the opposite direction, widening the passage that was being narrowed again.

Such traveling in the opposite direction is performed by a preset timer T.
Lasts for the operating time of C.

The operating time of this timer TC is, for example, 10z when the movable shelf is
Click the button as the degree required to go backwards.

When the timer TC stops operating after a certain period of time, its contacts TC1 and TC2 open, the excitation of the relay BX is cut off and its contact BXl opens, the excitation of the relay BX is cut off and its contact BXI opens, and the The retrograde movement of is stopped.

By reversing the shelves in this manner, the inside of the passage is widened, so that the worker who had the button wedged between the shelves can escape from the passage, and can also remove the case and foreign objects.

During the foreign object detection operation, the relay DX is energized and the indicator light LO lights up, so you can know from the indicator light LO that the foreign object detection operation is in progress.

By the way, depending on the object stuck between the shelves or the situation, there may be cases where the foreign object detection switches 11LS to 1nLS etc. cannot be reset even if the shelves are moved backwards a certain distance.
In the past, when about 120 seconds had passed, the contact TB1 of the timer TB would open, and after that, in order to make the shelf run, one of the seesaw switches on one of the shelves was operated and the relay switch OA3゜IA3t 2A3.3A3 Even if one is closed, relay BX is not energized, and that contact BX
1 cannot be closed, it becomes impossible for the shelves to move, and it may become impossible for a worker caught between the shelves to escape or to remove a foreign object.

In such a case, the embodiment of the present invention presses the auxiliary pushbutton switches AUPB1 and AUPB2.

When auxiliary push button switch AUPB1 is closed, timer TC is energized, contacts TCI and TC2 are closed for a certain period of time as described above, and timer TD and relay CXK are energized.

Then, one of seesaw switches OA3 to 3A3, timer contact TC2, and auxiliary push button switch AUP
Relay BX is energized via B2, timer contact TDl, and relay contact EX+, and relay BX is energized to close relay contact BX1 and close the electric path to motor control circuit γ0.

As mentioned above, energizing the relay CX means switching the circuit in the direction of moving the movable shelf backwards, so press this button and the movable shelf moves backwards in the direction of widening the passage.
By traveling at the travel limit 1 and activating the limit switch circuit 110, the traveling of the shelf is stopped as described above.

In this way, the aisles that were being narrowed can be widened again to the maximum extent possible, making it easy to remove the escape buttons for workers and foreign objects that were in the aisles between the shelves, and keep each timer, relay, etc. in its original state. Therefore, a passage can be formed again between the desired shelves.

Limit switch OLS linked to each movable shelf,
Due to failure or malfunction of I LS, 2LS, 3LS, or failure of other electrical components, the movable shelf may reach its movement limit of 1.
Even if the vehicle is moved, all or one of the drive motors M1, M2tM3 may be continuously energized, and if this continues, the drive motor may overheat and burn out.

However, according to the illustrated embodiment, while the drive motor of any of the movable shelves is energized, the seesaw switch OA
3t IA3 t2A3.3A3 and relay contact DX2, timer contact TBI opens after 20 seconds and cuts off the excitation of relay BX. ing.

Therefore, when each of the above-mentioned limit switches operates normally, the movement is completed within the above-mentioned 20 seconds and the electricity is cut off, but due to a malfunction of the above-mentioned limit switches etc. Even if the drive motor is energized, after 20 seconds, the contact TBI of the timer TB opens to cut off the excitation of the relay BX, and the contact BX1 opens to cut off the energization to the drive motor.

This way the motor is protected.

By the way, if a power outage occurs for the same reason while the shelf is running, the shelf will stop midway.

When the power is restored in this state, the shelves will start running again unless special equipment is added.

However, if a worker enters the narrowing aisle during a power outage and the power is restored in that state, there is a risk that the worker in the aisle will get stuck between the shelves.

In the present invention, a power outage countermeasure circuit 30 is provided in order to eliminate such a danger.

For example, suppose that a power outage occurs when the /-no switch OC8 is closed to form a passage between shelves 0 and 1, and then the power is restored, the timer TA is energized and the Contact TAI continues to be in the closed state 1, and after a certain relatively short period of time, contact TA1
opens.

Therefore, while contact TAt is closed, its contact TAI
When the seesaw switch is closed, the relay AX is energized via the relay contact OA2, and the relay AX is self-held by closing the contact AXI.

Since the other contact AX2 opens due to the excitation of the relay AX, other circuits connected after this contact AX2 do not operate, and the motor M1. M2, M3, therefore shelves 1, 2,
3 never moves.

In this way, even if the power outage is restored, the shelves will not run recklessly, so the above-mentioned dangers can be prevented.

After the power is restored, when you want to run the shelf again, temporarily close the seesaw switch OC8, which is in the closed position 1, and reset the relay contact OA2 to cut off the excitation of the relay AX. , returns AX2 to its original state.

Then close the desired seesaw switch.

At this time, one of the relay contacts OA2 to 3A2 closes, but the timer contact TAI is already open, and
Since relay contact AXI is open, relay AX is not energized.

Therefore, with the seesaw switch closed, normal driving operation can be carried out.

Furthermore, the above-described operation for maintaining safety is performed in the same way when the main switch 32 is closed while any seesaw switch is closed.

The configuration of a command circuit that issues a command to form a passage between desired shelves by setting the passage formation command switch provided in each column as a switch that self-maintains its operating state, such as a seesaw switch, for example. In the conventional electric movable shelf, which has a simplified structure, when the power goes out and the power is restored, the movable shelf starts traveling again based on this command. However, according to the present invention, the passage formation command switch installed in each column can be used as a self-holding switch to command the operator. We have simplified the circuit configuration and installed a power outage countermeasure circuit that prevents the shelves from moving even if the power is restored after a power outage. The safety of workers entering the facility will be guaranteed.

In the illustrated embodiment, there are three units of movable shelves, but the present invention is not limited to this, and the number of movable shelves can be increased or decreased in any manner.

In that case, the electrical components included in each column may be increased or decreased according to the same connection pattern as the electrical component connection pattern in the illustrated embodiment.

In the past, all of the shelves could be made into movable shelves.

The /-saw switches in the command circuit may be provided centrally on the fixed shelf.

Furthermore, semiconductor circuit elements may be used instead of relays.

[Brief explanation of drawings]

Fig. 1 is a side view showing an arrangement example of an electric movable shelf having a device of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a front view showing one of the above movable shelves, and Fig. 4 is a side view showing an example of the arrangement of an electric movable shelf equipped with the device of the present invention. A circuit diagram showing an example of the part including the motor drive circuit in the device, FIG. 5 is a circuit diagram showing an example of the lighting/warning circuit as above, and FIG. 6 is a part including the command circuit, foreign object detection control circuit, and motor control circuit as above. FIG. 7 is a circuit diagram showing an example of the same limit switch circuit as above. 0... Fixed shelf, 1,2.3... Mobile shelf, 60...
Foreign object detection control circuit, 70...Motor control circuit, 80
...Motor, drive circuit, 90...Emergency stop circuit,
T.A. TB, TC, TD...Timer OA, IA, 2A
. 3A, OB, IB, 2B, 3B, CX, BX. DX, EX, IM, IR, 2M, 2R, 3M. 3Rtl, IL, 2t, 3L...Relay, OCS. IC8, 2C8, 3C3...Seesaw switch, OP
B, IPB t 2PB, 3PB...Emergency stop push button switch, 11 L S , 1 n L S t 2
1' LS > 2nLS, 31 LS, 3nLS・
・Foreign object detection switch, OLS, ILS, 2LS, 3
LS...Limit switch, Ml, M2, M3.
··motor.

Claims (1)

[Scope of utility model registration request] A command to form a passage between the shelves is issued by operating a switch that is provided for each column and that maintains its operating state by itself in electrically operated movable shelves that are movably arranged on a rail by a drive motor. A command circuit, a motor control circuit that determines the movable shelf to be run and the direction in which it should run based on the commands of this command circuit, and controls forward rotation, reverse rotation, and stop of the drive motor, and a motor control circuit that controls forward rotation, reverse rotation, and stop of the drive motor, and A relay AX that is energized and self-maintained via a timer TA that operates after a time has elapsed, a contact TA1 of the timer TA that remains closed until a certain period of time has elapsed after energization, and a contact that operates based on a command from the command circuit. and a relay contact AX2 that cuts off the power to the motor control circuit and the drive motor by energizing the relay, and the power outage countermeasure circuit has a power outage countermeasure circuit having a relay contact AX2 that cuts off the power supply to the motor control circuit and the drive motor by excitation of the relay. If there is a power outage and then the power is restored, the relay AX is energized and self-maintained via the timer contact TA1, which remains closed for a certain period of time after the power is restored. An electric movable shelf characterized in that the contact AX2 of the relay AX is configured to cut off the power to the motor control (2) circuit so that the movable shelf does not travel.