JPS6221433Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a braking mechanism for a meat cutter, and more particularly to a braking mechanism for a meat cutter suitable for a meat cutter having a braking means for stopping a meat box at a front stop position.

In conventional meat cutting machines that stop the meat box at the front stop position after cutting the meat loaf, a micro switch or proximity switch detects when the meat box approaches the front stop position, and then stops the meat box at the front stop position. , by using an electromagnetic brake, an electric motor with a braking device, or by passing a direct current through the electric motor, and
I tried to brake suddenly. Therefore,
This has the disadvantage that it generates shock and vibration during braking, which applies mechanical stress to the speed reducer, crank mechanism, and connecting rods between the meat box and the crank mechanism, accelerating wear on each power transmission section.

The present invention was developed in view of the above, and its purpose is to reduce shock and vibration when the meat box is stopped at the front stop position, and to accurately move the meat box to the front stop position. An object of the present invention is to provide a braking mechanism for a meat cutter that can be stopped.

The present invention includes a cutoff position determining means for arbitrarily setting the power cutoff position of the electric motor in order to stop the meat box at the front stop position after decelerating the speed of the meat box;
A cutoff means for cutting off the power to the electric motor based on the output of the determining means after the cutting operation is completed; a detection means for detecting that the meat box containing the meat loaf has come to a front stop position; The meat box is configured to include a braking means drive circuit operated by an output signal of the detection means and an output signal of the cutoff means for driving a braking means for stopping the meat box at the front stop position after the work is completed.

The present invention will be described in detail below with reference to FIGS. 2 to 4 and embodiments and FIGS. 1 and 5.

FIG. 1 is a front view showing a schematic configuration of a meat cutter. Two parallel sliding members 2 on the upper surface of the support member 1
A meat box 3 for storing meat lumps is supported and fitted onto this sliding member 2 so as to be able to reciprocate (in the front and rear directions in the figure). One end of an arm 4 is rotatably supported at the bottom of the meat box 3.
The other end is rotatably supported by a crank 5. Reference numeral 6 denotes a meat box driving electric motor, which is connected to a speed reducer 7 by a power transmission means such as a belt. Reducer 7
A crank 5 is fitted onto the output shaft of the machine, and the rotation of the electric motor 6 causes the crank 5 to rotate via a reducer 7, thereby causing the meat box 3 to reciprocate via the arm 4. Reference numeral 8 denotes a cutting tool, and the cutting tool 8 is rotated by an electric motor and power transmission means (not shown). Reference numeral 9 denotes an operation switch, and by operating the operation switch 9, the cutter 8 rotates and the meat box 3 moves back and forth, so that the meat loaf stored in the meat box 3 is cut continuously or intermittently. .

Reference numeral 10 denotes the position detection section for the meat box 3, and as shown in Figures 2a and 2b (a is a plan view, b is a front view), it is composed of a protrusion 11 fixed to an appropriate position on the output shaft 7a of the reducer 7, a detector 12 fixed to an appropriate position on the support member 1 to detect the presence or absence of the protrusion 11, and a detector 13 movably arranged at an appropriate position on the support member 1 to detect the presence or absence of the protrusion 11.

FIG. 3 is a block diagram showing one embodiment of the braking mechanism of the meat cutter of the present invention. In FIG. 3, a normally open contact 14 is connected in series between the power source and the electric motor 6, and when the contact 14 is closed, the electric motor 6 rotates. In addition, normally open contacts 15 are provided which close during braking when the normally open contacts 14 open, and one of the normally open contacts 15 is connected to the motor side terminal of the normally open contact 14, and the other is connected to the anode side of the thyristor 16. be. The cathode side of the siris 16 is connected to one of the power supply side terminals of the normally open contact 14.

Operate the operating switch 9 in Figure 1 to open the normally open contact 1.
When the circuit 4 is closed, the electric motor 6 rotates, and the meat box 3 reciprocates through the power transmission mechanism as described above, thereby cutting the meat. After the cutting operation, the operating switch 9 is turned off, the protruding piece 11 is detected by the detector 13 whose detection position can be adjusted according to the reciprocating speed of the meat box 3, and the normally open contact 14 is opened by the output of the detector 13 and the electric motor is activated. Cut off the power supply to 6. Thereafter, the meat box 3 moves idly and gradually decelerates. When the meat box 3 reaches the front stop position due to idle movement, this is detected by the detector 12, and its output closes the normally open contact 15, and the power supply voltage is connected between the gate and cathode of the thyristor 16. The synchronized trigger signal is sent to the trigger circuit 25.
Enter more information. Since the braking operation is performed after the meat box 3 is decelerated by air movement in this manner, it is possible to reduce shock and vibration during braking.

Next, a circuit for operating the normally open contacts 14 and 15 will be explained. FIG. 4 is a circuit diagram showing one embodiment thereof. In FIG. 4, 17 is an inverter, 18 is a flip-flop, and the flip-flop 18 is inverted from logic "L" to logic "H" by the rise of the output signal when the operation switch 9 is turned on. This "H" signal is amplified by the amplifier 19, excites the relay coil 20, and rotates the motor 6 by closing the normally open contact 14 in FIG.

21 is a timer, and the timer 21 receives a signal inverted by the inverter 17 of the output signal of the operation switch 9 and an output signal of the detector 13, and the output signal from the operation switch 9 is logic "H" (when turned on). After inverting from 1 to 1 to logic "L", it operates at the rising edge of the output of the detector 13, and the output signal becomes logic "H" for a certain period of time _T1 . The flip-flop 18 is cleared by the output signal of the timer 21,
The output signal of flip-flop 18 is inverted from logic "H" to logic "L", relay coil 20 is deenergized, normally open contact 14 is opened, and power supply to motor 6 is cut off. That is, once the operation switch 9
to cut the meat, and after returning the operation switch 9 to the original position to finish the work, the detector 13 detects the protrusion 11 and sends out an output, the timer 21 operates, and the time T Flip flop between ₁
Outputs a signal to clear 8.

22 is also a timer, and timer 22 is timer 2.
After the output signal of No. 1 is inverted from logic "L" to logic "H", when the detector 12 detects that the meat box 3 has reached the front stop position and sends out an output, it operates at the rising edge of the output signal. However, the output signal becomes logic "H" for a certain period of time _T2 . The output signal of the timer 22 is amplified by the amplifier 23, and the relay coil 2
4 is energized, and the normally open contact 15 in FIG. 3 is closed. While the normally open contact 15 is closed, the trigger circuit 25 shown in FIG. 3 operates to fire the thyristor 16 and brake the motor 6.

The set time T ₁ of the timer 21 is set longer than the time required for the meat box 3 to stop without braking after cutting off the power supply to the electric motor 6 during maximum speed operation. Also, the set time T ₂ of the timer 22 is the meat box 3.
Determined by the braking torque required to stop the

FIG. 5 is a time chart of the signals of each part in FIG. The output signal E indicates the output signal from the timer 21, and F indicates the output signal from the timer 22.

As described above, according to the embodiment of the present invention, the output signal from the detector 13 causes the meat box drive motor 6 to
After cutting off the power supply to the meat box 3 and reducing the speed of the meat box 3 by air movement, when the meat box 3 reaches the front stop position, the motor 6 is braked by an output signal from the detector 12. Therefore, shock and vibration during braking can be reduced.

As explained above, according to the present invention, it is possible to reduce shock and vibration when the meat box is stopped at the front stop position, improve the mechanical life of the power transmission mechanism, and move the meat box to the front stop position. This has the effect of being able to stop accurately at the stop position.

[Brief explanation of the drawing]

Figure 1 is a front view showing the general configuration of the meat cutter, Figure 2
The figures are a plan view and a front view showing an embodiment of the position detection section of the meat box shown in Fig. 1, Fig. 3 is a block diagram showing an embodiment of the braking mechanism of the meat cutter of the present invention, and Fig. 4 is a FIG. 3 is a block diagram showing an embodiment for controlling the opening and closing of each normally open contact, and FIG. 5 is a time chart of the various signals in FIG. 4. 3...meat box, 4...arm, 5...crank,
6...Meat box drive motor, 8...Cutter, 9...Operation switch, 10...Detector, 11...Protrusion piece, 1
2, 13...detector, 14,15...normally open contact,
18...Flip-flop, 20,24...Relay coil, 21,22...Timer.

Claims (1)

[Scope of utility model registration request] An electric motor, a reducer that decelerates the rotation of the electric motor, and an output shaft of the reducer reciprocates a meat box storing a meat loaf through a crank mechanism to cut the meat loaf with a rotary knife. A meat cutting machine comprising a means for cutting and a braking means for stopping the meat box at a front stop position after the cutting operation is completed, and a cutoff position determining means for arbitrarily setting a power cutoff position of the electric motor; A cutoff means for cutting off the power to the electric motor based on the output of the determining means after the work is completed, a detection means for detecting that the meat box has reached the front stop position, and an output signal of the detection means and the cutoff means. 1. A braking mechanism for a meat cutter, comprising a braking means drive circuit that operates in accordance with an output signal to drive the braking means.