JPH0426237Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for a meat slicer.

In a conventional meat slicer, when the operation switch is closed, the meat box reciprocates, and the meat loaf mounted on the meat box is cut by a rotating round blade. As cutting progresses, the meat chunks in the meat box gradually become smaller until they reach a size that prevents them from being sent out in the direction of the round blade by the rollers. At this point, the meat is actually not cut. Even in this state, the meat box continued to move back and forth, so it was useless.
To stop the meat box, the operator must open the operation switch and stop the reciprocating movement of the meat box when the meat lumps in the meat box have become small and can no longer be fed in the direction of the round blade. It was troublesome.

Further, if the above-mentioned condition occurs when the operator is away from the main body after the operator closes the operation switch, the meat box continues to move back and forth, resulting in a lack of safety.

In order to eliminate the above problem, some meat slicers are equipped with a detection switch that detects the position of the arm in the meat box and open the motor drive circuit when the arm reaches the lowest point. Because it was installed in a moving meat box, the electrical wiring from the detection switch was constantly being bent, leading to problems such as disconnections. In addition, consideration must be given to providing bend-resistant wiring to prevent wire breakage, and this is not an effective measure in terms of cost and safety.

[Purpose of invention]

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology, improve the operability of the meat slicer, and improve the safety during cutting operations. It automatically stops at the front position.

[Key points of the idea]

In the present invention, as the meat lump in the meat box gradually becomes smaller during the cutting operation, the roller that presses the meat lump from above and feeds the meat lump in the direction of the round blade moves downward. When the rollers reach the lowest point, the meat lumps in the meat box are so small that they cannot be sent out in the direction of the round blade by the rollers. From the above points, a detection switch that detects when the roller has reached the lowest point is connected in series with the operation switch, and when the operation switch is closed and the roller reaches the lowest point, the motor drive circuit The relationship between the detection switch, cutoff circuit, motor drive circuit, and braking device drive circuit has been devised so that the meat box is stopped in front of the meat box.

[Example of idea]

FIG. 1 is a rear view of a meat slicer showing an embodiment of the present invention. FIG. 2 is a top view of the meat slicer of the present invention seen from A. FIG. 3 is a rear view showing the relationship between the green meat, the rollers, and the detection switch. FIG. 4 is a circuit diagram showing an embodiment of the present invention.

In FIG. 1, a round blade 2 is pivotally supported by a round blade base 10 erected on the top of a machine stand 1, and is rotationally driven by an electric motor 11 via a power transmission means such as a belt (not shown). The meat box 4 is slidably supported on two rails 5 fixed on the machine base 1, and the bottom of the meat box 4 is connected to a speed reducer 3 fixed on the machine base 1 by a crank device 6. ing. The speed reducer 3 is connected to the electric motor 11 by a power transmission mechanism (pulley, belt, etc.). A detection piece 13 is fixed to the shaft of the reducer 3, and the detection piece 13 is fixed to the shaft of the reducer 3.
A position detection switch 14 is fixed. The meat box 4 is also provided with an arm 7 that is supported so as to be movable up and down, and a roller 9 that is pivotally supported by the arm 7. The roller 9 rotates every time the meat box 4 makes one reciprocation via a power transmission means such as a chain (not shown), and feeds the meat loaf 17 to the round blade 2 side at a constant feed amount. There is. A detection piece 15 is provided on an extension of the axis of the roller 9. The cover 8 is fixed to the machine base 1, and the cover 8 is provided with a detection switch 16 for detecting the detection piece 15 when the roller 9 is at the lowest position.

A normally open relay contact 18a is connected in series between _{l2 , l3} of the power lines l1, _l2 , _l3 and V, W of the terminals U, V, W of the motor 11, and the normally open relay contact 18a When closed, the electric motor 11 rotates, and the meat box 4 moves through the speed reducer 3 and crank device 6 to X and X shown in FIG.
It is designed to reciprocate in the X′ direction. As shown in Fig. 4, between the power lines _l2 and _l3 , there are a normally open relay contact 18a, a normally closed timed operation/timed return contact 19b, and a relay coil 18, and between the ON side of the operation switch 12 and the connection point A. A normally closed relay contact 22b is connected, a normally open relay contact 22a is connected between the ON side of the operation switch 12 and connection point C, and a position detection switch 14 and a relay coil are connected between connection point C and power line _l3 . 19. The relay coil 20 is connected in series with the normally open timed operation/timed return contact 19a and the normally closed timed operation/
The time-limited return contact 20b and the relay coil 21 are connected in series. In addition, the operation switch 12
The OFF side is connected to connection point c. moreover,
Between the ON side of the operation switch 12 and the power line _l2 ,
The normally open relay contact 18a, the detection switch 16, and the relay coil 22 are connected in series, and the normally open relay contact 22a is connected to the connection point D. The braking device is composed of a thyristor 23, a trigger circuit 24, and a normally open relay contact 21a.
One side of a is connected to the V and W terminals of the electric motor 11, the other side is both connected to the anode side of the thyristor 23, and the cathode side of the thyristor 23 is connected to the power supply line _l3 . Then, the trigger circuit 24 operates while the normally open relay contact 21a is closed.
This circuit outputs a trigger signal synchronized with the power supply and fires the thyristor 23. When the thyristor 23 fires, a braking current flows through the motor 11, causing the motor 11 to stop. Consider a case where a meat block 17 is loaded in the meat box 4 and a cutting operation is performed. A meat loaf 17 is placed in the meat box 4, and the meat loaf 17 is pressed down by the roller 9 as shown in A in FIG. Next, when the operation switch 12 is turned to the ON side, the relay coil 18 operates, the normally open relay contact 18a closes, and the motor 1
1 is supplied with electric power, the electric motor 11 rotates, the round blade 2 rotates, and the meat box 4 moves in the direction of X from X in FIG. 2 via the reducer 3 and crank device 6. Third
In state A in the figure, even if the meat box 4 moves to X' in FIG. 2, the detection switch 16 does not detect the detection piece 15, so the relay coil 22 does not operate. 4 continues to reciprocate in the X and X' directions in FIG. 2, and can cut the meat 17. At this time, the normally open relay contact 22a is open, so even if the position detection switch 14 detects the detection piece 13 and closes it,
Relay coils 19 and 20 do not operate.

Next, consider the case where the operation switch 12 is turned to the OFF side in order to interrupt the cutting operation. Even if the operation switch 12 is turned to the OFF side, the operation does not stop because the relay coil 18 is self-held by the normally open relay contact 18a. Therefore, the electric motor 11 continues to rotate. Thereafter, when the position detection switch 14 detects the detection piece 13, the relay coils 19 and 20 are activated. When the relay coil 19 operates, the normally open timed operation/timed return contact 19a closes for a certain period of time _T1 , and the normally closed timed action/timed return contact 19b opens, so the self-holding of the relay coil 18 is released and the relay coil 18 stops working,
Normally open relay contact 18a opens and power supply to motor 11 is cut off. When the relay coil 20 operates, the normally closed timed operation/timed return contact 20b opens for a certain period of time _T2 .

The above times T ₁ and T ₂ are set so that T ₁ >T ₂ . Therefore, when the relay coils 19 and 20 operate, the relay coil 21 does not operate immediately because the normally open timed operation/timed return contact 19a closes and the normally closed timed operation/timed return contact 20b opens at the same time. ₂ , it operates only when the normally closed timed operation/timed return contact 20b closes, and continues to operate until the normally open timed operation/timed return contact 19a opens, that is, for the time period T ₁ -T ₂ . When the relay coil 21 operates, the normally open relay contact 21a closes, the trigger circuit 24 fires the thyristor 23, a braking current flows to the motor 11, the motor 11 stops, and the meat box 4 moves to the front stop position (Fig. 2). Stop at X).

Next, in the state of A in Figure 3, turn on the operation switch 12.
Let us consider a case where the cutting operation of the meat lump 17 is continued by turning it to the ON side. The meat lump 17 is moved by the roller 9 to the round blade 2
As the cutting process progresses, the size gradually decreases as the cutting process progresses. Therefore, the roller 9 also gradually moves downward. Eventually, the meat mass 17 becomes extremely small as shown in FIG. 3, and the roller 9 reaches its lowest point. In this case, the roller 9 prevents the green meat 17 from being sent out in the direction of the round blade 2.

When the meat box 4 moves to the position X' in FIG. 2 in the state shown in FIG. 3, the detection switch 16 detects the detection piece 15 and closes it. When the detection switch 16 closes, the normally open relay contact 18a is closed, so
The relay coil 22 operates and the normally open relay contact 22
a closes and normally closed relay contact 22b opens. At this time, the relay coil 22 is self-held. Also,
Since the relay coil 18 is self-held, its operation does not stop. Therefore, the electric motor 11 continues to rotate. Thereafter, when the meat box 6 moves in the X direction from X' in FIG. , the relay coil 21 operates for a period of time T ₁ - T ₂ , similar to the above-mentioned interruption of the cutting operation, a braking current flows through the motor 11 , the motor 11 stops, and the meat box 4 returns to the front stop position (see FIG. 2). Stop at X).

As mentioned above, during the cutting operation, the meat loaf 1 in the meat box 4
When the meat box 7 becomes so small that it cannot be fed in the two directions of the round blade by the roller 9, the power supply to the electric motor 11 is automatically cut off, and the meat box 4 is moved to the front stop position (the second
Stop at X) in the figure.

Also, when the operation switch 12 is turned to the OFF side,
The self-holding of the relay coil 22 is released, the operation of the relay coil 22 is stopped, and the normally open relay contact 22
a opens and normally closed relay contact 22b closes. Therefore, by turning the operation switch 12 to the ON side, the cutting operation can be easily restarted.

In the above explanation, times T ₁ and T ₂ are the times when the meat box 4
It is only necessary to set an appropriate time for the motor to stop at the front stop position (X in Fig. 2).

[Effect of idea]

According to the present invention, it is detected that the meat lump 17 in the meat box 4 has become so small that the roller 9 does not send it out in the two directions of the round blade, and the electric motor 11 automatically
Since the power supply is cut off and the meat box 4 is stopped at the front stop position (X in FIG. 2), unnecessary reciprocating movement of the meat box 4 can be stopped.

In addition, even if the operator leaves the machine, the reciprocating movement of the meat box automatically stops at the front position once the meat loaf has been cut, improving the stability of the meat cutter. , by providing the detection switch 16 on the cover fixed to the machine base 1,
Wiring of the output line of the detection switch 16 can be simplified and safety can be improved.

[Brief explanation of the drawing]

FIG. 1 is a rear view of a meat slicer showing an embodiment of the present invention. FIG. 2 is a top view of FIG. 1 viewed from A. FIG. 3 is a rear view showing the relationship between the arm 7, the roller 9, and the meat mass 17. FIG. 4 is a circuit diagram showing an embodiment of the present invention. In the figure, 1 is the machine base, 2 is the round blade, 3 is the reducer, 4 is the meat box, 5 is the rail, 6 is the crank device,
7 is an arm, 8 is a cover, 9 is a roller, 10 is a round blade base, 11 is an electric motor, 12 is a driving switch,
13 is a detection piece, 14 is a position detection switch, 15 is a detection piece, 16 is a detection switch, 17 is a meat lump, 1
8, 19, 20, 21 and 22 are relay coils, 23 is a thyristor, 24 is a trigger circuit, 18
a, 21a and 22a are normally open relay contacts, 22
b is a normally closed relay contact, 19a is a normally open timed operation/timed return contact, and 19b and 20b are normally closed timed operation/timed return contacts.

Claims (1)

[Scope of utility model registration request] A round blade that is rotatably driven on the top of the machine base, and a meat box that reciprocates in parallel to the round blade surface by a drive device that includes an electric motor and a speed reducer mounted on the machine base, and A movably supported arm and a roller rotatably supported by the arm for delivering the meat loaf are provided, an operation switch for opening and closing the drive circuit of the electric motor, and a position detection switch for detecting the front position of the meat box. After opening the operation switch, in a meat slicer equipped with a braking device driven by a position detection switch, a detection switch is turned on the machine to detect the lower limit position of the vertical movement of the arm or the roller during reciprocating movement of the meat box. and the detection switch is connected in series with the operation switch,
When the operation switch is closed and the detection switch is closed during the meat cutting operation, that is, while the meat box is reciprocating, the position detection switch cuts off the drive circuit and drives the braking device. Control device for meat slicer.