JPS6234713Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is equipped with a meat box that is driven by a motor and travels back and forth on the top surface of the machine base toward a rotating round blade that is installed upright on one side of the machine base. When the above motor that drives the motor is turned on, it remains OFF and the
The present invention relates to a braking device for a meat box in a meat slicer, in which an electromagnetic brake is attached to the drive system of the meat box, which is turned ON when the OFF state is turned on to brake the running of the meat box.

Conventional braking devices of this type, for example, as described in Utility Model Application Publication No. 20294 of 1978, connect the b contact of a relay that turns on and off the motor for driving the meat box in series with the electromagnetic brake. A brake circuit was formed by connecting the brakes so that a predetermined large current would flow through the brakes at the same time as the motor was turned off, which had the disadvantage of causing a large impact when the heavy meat box came to a sudden stop.

In order to eliminate the above-mentioned drawbacks of the conventional methods, the present invention is a meat-packing machine equipped with an electromagnetic brake that operates in reverse to the motor that drives the meat box as described above and brakes the running of the meat box when the motor is turned off. A braking device for a meat box in a slicer includes a transistor whose base is connected to a limit switch that turns off the motor that drives the meat box, and a transistor that is connected in parallel with a relay that brakes the motor on and off, and a collector of this transistor. A capacitor connected in parallel with the emitter, a resistor connected in series with the collector and the capacitor, and a second transistor whose base is connected to this resistor via a resistor. By forming a brake circuit that controls the operation of the electromagnetic brake, and connecting the collector of the second transistor of this brake circuit to the electromagnetic brake, the above-mentioned operation can be performed when the meat box driving motor is turned off. The electric current flowing through the brake is gradually increased to gently brake the meat box.

Embodiments of the present invention will be described below with reference to the drawings.

In Figure 1, PB is the power switch, _M1 is the motor for driving the round blade, _M2 is the motor for driving the meat box,
MC ₁ is the relay for the above motor M ₁ , MC ₁ a is the same relay contact, MC ₂ is the relay for the above motor M ₂ , MC ₂ a
is the same relay contact as above, _L0 is the emergency stop switch, _L1 is the safety switch, _L2 is the round blade rotation switch, _L3 is the meat box drive switch, X is the safety relay, and Xa is the same relay as above. Contact point, Ls is the limit switch for stopping the meat box in front, B is the electromagnetic brake,
Q ₁ and Q ₂ are transistors, R ₅ and R ₆ are resistors, C ₂ is a capacitor, E is connected to the meat box drive switch L ₃ and front stop limit switch LS, and the brake B and transistor Q ₁ , Q ₂ , resistors R ₅ , R ₆ and a capacitor C ₂ .

The above transistor Q ₁ is a meat box drive switch L ₃ that turns off the motor for driving the meat box at base b.
and connect it to the limit switch LS for front stop,
Connected in parallel with relay MC ₂ . Also resistance R ₅
is connected to the collector c side of this transistor Q ₁ , and the capacitor C ₂ is connected in parallel between the collector c and emitter e of the transistor Q ₁ , and the capacitor C 2 is connected to the above resistor
Connected in series with R ₅ . Also transistor
Q ₂ connects its base b to the above resistor R ₅ and capacitor
The collector _c is connected to the electromagnetic brake B, while the collector c is connected to the electromagnetic brake B via a resistor _R6 .

FIG. 2 schematically shows a meat slicer whose drive is controlled by the circuit configuration shown in FIG. 1.

In the figure, 1 is a round blade that is erected on one side of the machine base F and rotates as a result of a motor _M1 , 2 is supported on the front and rear sides of the back side by a rail 3 that is installed opposite to the top surface of the machine base F, The meat box reciprocates toward the round blade 1 via a worm transmission mechanism 4 driven by a motor _M2 , a crank 5, and a connecting rod 6. The electromagnetic brake B is
It is provided at the outer end of the worm shaft 4' of the worm transmission mechanism 4. In addition, the emergency stop switch
L ₀ , safety switch L ₁ , round blade rotation switch L ₂ ,
The meat box drive switch L ₃ is built into the operation box 7 provided at the upper front of the machine base F. When the operation rod 7' protruding from the box 7 is rotated to a predetermined position, the switch L ₁ is turned OFF and the switch is turned off. L ₂ is turned on to rotate only the round blade 1, switches L ₂ and L ₃ are turned on at the same time to drive the round blade 1 and meat box 2 at the same time, operating the slicer, and stopping the round blade 1 and meat box 2. This is becoming more and more common. Further, the front stop limit switch LS is fixed at a position where it comes into contact with and separates from a cam 8 fixed to the lower end of the crankshaft 5',
After the operating rod 7' is returned from the meat box driving position to the stop position, the meat box 2 is brought into contact with the cam 8 at the end of the return path of the meat box 2, thereby stopping the meat box 2 at the front position.

Next, the operation of this braking device constructed as described above will be described.

First, when power switch PB is turned on, the base current of transistor _Q1 flows, so the collector current flows, and the base current of transistor _Q2 does not flow. Next, when the operating rod 7' is placed in the operating position, switches L ₂ and L ₃ are turned ON, base current flows through transistor Q ₁ , brake B is kept OFF, and motors M ₁ and M ₂ are rotated. Continue slicing operation. Next, when the operating rod 7' is returned to the round blade rotation position, the switch _L3 is turned OFF, and when the meat box 2 reaches the predetermined position, the limit switch LS is activated.
OFF, relay MC ₂ is OFF, motor M ₂ is OFF. On the other hand, when switch LS is turned off, the base current of transistor Q ₁ becomes 0, and capacitor C ₂
As charging begins, the base current of transistor _Q2 also gradually increases. Therefore, the collector current of _Q2 , that is, the brake current, also gradually increases, and the meat box 2 is slowly braked by the electromagnetic brake B.

By appropriately increasing the current amplification factor between the base current and the collector current of the transistor Q ₂ , the capacitance of the capacitor C ₂ can be reduced and a large brake current can be controlled. Further, the charging time of the capacitor _C2 , that is, the gradual increase in the brake current, is determined by the time constant of the resistor _R5 and the capacitor _C2 . When using a variable resistor for resistor _R5 , when the inertia of meat box 2 is large, reduce the resistor to shorten the charging time of capacitor _C2 , and brake B
When the inertia is small, the resistance is increased and the brake B is controlled to brake slowly. Furthermore, by interlocking the variable resistor with the transmission of the meat box, it is possible to automatically control variations in the stopping position caused by the slow speed of the meat box and stop the meat box at a substantially constant position.

As described above, according to the present invention, the meat box can be braked gently, so that the impact generated when using the braking device is alleviated, and the slicer can be operated smoothly.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a schematic elevational view of a meat slicer equipped with the circuit. PB: power switch, _M1 , _M2 : motor, Ln (n
(0 to 3)...switch, LS...limit switch, X, MC ₁ , MC ₂ ...relay, Xa, MC ₁ a,
MC ₂ a...Relay contact, E...Brake circuit, Q ₁ , Q ₂
...transistor, b...base, c...collector, e
...emitter, _R5 , _R6 ...resistors, _C2 ...capacitor,
B: electromagnetic brake; 1: round blade; 2: meat box; 3: rail; 4: worm transmission mechanism; 4': worm shaft; 5: crank; 5': crank shaft; 6: connecting rod; 7: operation box; 7: operation rod; 8: cam;
F...machine unit.

Claims (1)

[Scope of utility model registration request] A meat box 2 is installed on one side of the machine stand F and moves back and forth on the top surface of the machine stand F, driven by a motor _M2 , toward the rotating round blade A. In a meat slicer in which an electromagnetic brake B is attached to the drive system of the meat box ₂ , the electromagnetic brake B is kept OFF when the motor M ₂ is turned ON, and turned ON when the motor M 2 is OFF to brake the running of the meat box 2. In the meat box braking device, base b is connected to the limit switch LS that turns off the motor _M2 , and the motor is turned off.
Transistor Q ₁ connected in parallel with relay MC ₂ that controls ON/OFF of M ₂ , and this transistor Q ₁
a capacitor _C2 connected in parallel with the collector c and emitter e of the above, and a resistor connected in series with the collector c and capacitor _C2 , respectively.
_R5 and a second transistor _Q2 whose base b is connected to this resistor _R5 via a resistor _R6 , forming a brake circuit E that controls the operation of the electromagnetic brake B, A braking device for a meat box, characterized in that the collector c of the second transistor _Q2 of the brake circuit E is connected to the electromagnetic brake B.