JPS6315035Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a front position stop control device for a meat cutter, and is particularly suitable for precisely stopping a reciprocating meat box at a front stop position. It is related to the device.

In a conventional meat cutter, the reciprocating speed of the meat box is detected, and the time (hereinafter referred to as time T) for moving the meat box by inertia after cutting off the electric power of the electric motor that drives the meat box is determined according to the reciprocating speed of the meat box. (abbreviated as ₁ ) and the braking time were automatically adjusted to stop the meat box at the front position. That is, when the reciprocating speed is high, the time _T1 is shortened and the braking time is lengthened, and when the reciprocating speed is low, the time _T1 is automatically adjusted to be lengthened and the braking time is shortened. In this method, the time
Time _T1 is set so that the meat box does not stop during _T1 , and time _T1 is gradually decreased as the reciprocating speed of the meat box increases. For this reason, if the variable speed range of the reciprocating speed of the meat box is increased from 20 times/min to 60 times/min in terms of the number of reciprocations, it becomes impossible to secure time T ₁ in the high speed range, and the stopping position of the meat box changes from the front position. I had a problem with it shifting.

The present invention was developed in view of the above, and its purpose is to keep the meat box at a predetermined stop position, regardless of the reciprocating speed of the meat box, even when the variable speed range of the reciprocating speed of the meat box is widened. The objective is to be able to stop the vehicle accurately.

The present invention focuses on the fact that if the power cutoff point of the electric motor that drives the meat box reciprocatingly is automatically adjusted according to the reciprocating speed, there is no need to adjust the control time. In order to increase the time until the power is cut off when the reciprocating speed is low, a near stop position approach detection means and a delay time adjustment means are provided, and the power to the motor is cut off in proportion to the reciprocating speed of the meat box. The meat box is stopped at a predetermined front stop position by automatically adjusting the time until the meat box is stopped at a predetermined front stop position. It was designed to do so.

The present invention will be explained in detail below with reference to the embodiment shown in FIGS. 1 to 3 and FIGS. 4 to 6.

FIG. 1 is a schematic configuration diagram showing an embodiment of a meat cutter equipped with a meat box front position stop control device of the present invention, and FIG. 2 is a side view of the front stop position approach detection section of FIG. 1. . In Figure 1, 1 is a support member, and two parallel sliding members 2 are arranged on the upper surface of the support member 1, and can reciprocate on the sliding members 2 (in the front and rear directions in the figure). A meat box 3 is supported and fitted to the.
One end of an arm 4 is rotatably supported at the bottom of the meat box 3, and the end of the arm 4 is rotatably supported by a crank 5. 6 is a meat box driving electric motor (hereinafter abbreviated as _M1 ), and _M1 is connected to a reducer 7 by a power transmission means such as a belt.
A crank 5 is fitted onto the output shaft of the motor. Therefore, the crank 5 can be rotated by the rotation of _M1 via the reducer 7, and the meat box 3 can be reciprocated via the arm 4.

Reference numeral 8 denotes a round knife rotation drive motor (hereinafter abbreviated as M ₂ ), and M ₂ rotates the knife 9 using a power transmission means such as a belt.

Reference numeral 10 denotes an operation switch. By operating the operation switch 10, M ₁ and M ₂ are started, the meat box is reciprocated, the round cutter 9 is rotated, and the meat loaf stored in the meat box 3 is moved. Cut continuously or intermittently. 11 is a speed regulator, and by operating this, the reciprocating speed of the meat box 3 is adjusted. A detailed explanation of the speed adjustment mechanism will be omitted, but generally a means such as a continuously variable speed pulley may be used.

Reference numeral 12 denotes a front stop position approach detection section of the meat box 3, which as shown in FIG. Detector 14 is fixed at a proper location.

FIG. 3 is a block circuit diagram showing an embodiment of the circuit of the meat box front position stop control device of the present invention.
In FIG. 3, the output of the set-reset circuit 15 is inverted from logic "L" to "H" in response to the rise of the output signal of the operation switch 10. This logic "H" signal is amplified by the amplifier 16, and the electric motor
The drive circuit 17 of M ₁ and M ₂ is energized to rotate M ₁ and M ₂ , thereby reciprocating the meat box 3 shown in FIG. 1 and rotating the round knife 9. The drive circuit 17 is composed of an electromagnetic relay or a semiconductor switch connected in series to power circuits M ₁ and M ₂ (not shown). The AND gate 18 receives the outputs from the operation switch 10, the set-reset circuit 15, and the detector 14, and the output of the set-reset circuit 15 is logic "H" and the output of the operation switch 10 is inverted from logic "H" to "L". Only after that, the output of the detector 14 is output to the next stage circuit. That is, once M ₁ ,
After activating M ₂ and then returning the operating switch 10 to the original position to stop the meat cutting operation, the detector 14 detects that the meat box 3 approaches the front stop position for the first time. Then, an output signal as shown in FIG. 5c is sent out, and the output is transmitted to the next stage circuit.

A logic "H" signal from AND gate 18 closes normally open contact a ₁ and opens normally closed contact b ₁ . At this time, the capacitor 20 is charged via the resistor 19 from the power supply voltage. Charging voltage of capacitor 20
Since V ₂ is charged only while the output signal from the AND gate 18 is at logic "H", its charging characteristic is as shown by the l curve in FIG. 4. That is, it depends on the time it takes for the protruding piece 13 to pass the detector 14, and the faster the reciprocating speed of the meat box 3, the lower the charging voltage _V2 of the capacitor 20 becomes. t _A in Figure 4,
t _B and t _C are protrusions 13 during high, medium, and low speed operation, respectively.
It shows the transit time of t _A < t _B < t _C.

Next, the output signal of the AND gate 18 is logic “H”
When the state is reversed from "L" to "L", the normally open contact a ₁ opens, the normally closed contact b ₁ closes, and the charge in the capacitor 20 is discharged via the contact b ₁ and the resistor 21. The discharge characteristics at this time are as shown in the m ₁ , m ₂ , and m ₃ curves in FIG. 4. And the reference voltage of the next stage comparator 22
The time required to drop to the voltage V ₁ is T _A , T _B , and T _C (T _A < T _B < T _C ) during high, medium, and low speed operation, respectively, and the output signal of the comparator 22 is as shown in Fig. 5d. Outputs a signal as shown. The inversion of this signal from logic "L" to "H" resets the set-reset circuit 15, and inverts its output signal from logic "H" to "L" as shown in FIG. 5b. This “L” signal causes M ₁ ,
The drive circuit 17 of M ₂ is deenergized and the power to M ₁ and M ₂ is cut off. These T _A , T _B , and T _C are respectively high and
This is the opening delay time of the drive circuit 14 at medium and low speeds, and as the speed becomes lower, the power to M ₁ and M ₂ is cut off at a position where the meat box approaches the front stop position.

On the other hand, after the power to M ₁ and M ₂ is cut off, that is, after the logic of the comparator 22 is reversed from "L" to "H", the timer 23 is activated and the time required for the meat box to move due to inertia is determined. An output signal as shown in FIG. 5e, which is T ₁ , is generated. Next, the output signal e of timer 23
The timer 24 is activated by the inverted signal from logic "H" to "L", and the preset braking time T ₂
An output signal as shown in FIG. 5 is generated.
While the output signal of this timer 24 is at logic "H", it is amplified by the amplifier 25, drives the brake part 26, and the meat box 3
Stop at the front position.

Here, the braking unit 25 is an electromagnetic brake, a motor with a brake, a device for passing a direct current through the windings of the motor, or the like.

In addition, the braking time T ₂ regulated by the timer 24
is set in advance as a sufficient time required when the reciprocating speed of the meat box 3 is stopped at a position earlier than the high speed operation.

Now, the moving speed U _A of the meat box 3 at high, medium, and low speeds at the time when the protruding piece 13 passes the detector 14 ,
U _B , U _C , resistors 19, 21, capacitor 20
If the value of is set appropriately, the distance that meat box 3 moves within the power cutoff delay time to _M1 is approximately U _A T _A <
U _B T _B < U _C T _C , and as shown in Fig. 6, the meat box 3 is located further away from the front stop position during high-speed operation, and from this point on, the time T ₁ set in the timer 23 During this time, the meat box 3 will move further due to inertia, but even at this point, the meat box 3 is at a position further away from the front stop position as the speed of operation increases. From this point on, the meat box ₃ is braked for the braking time T2 set in the timer 24, so the accuracy of the stop position of the meat box 3 is improved, and it is possible to accurately stop the meat box 3 at the front stop position.

The distance that the meat box 3 moves during time T ₁ becomes longer when driving at high speed, but considering this point, T _A , T _B ,
This is what sets the time for T _C.

In addition, AND gate 18, contacts a ₁ , b ₁ , resistor 1
9, 21, a capacitor 20, and a comparator 22 are delay time adjusting means, and a timer 23 and a timer 24 are means for timing the time for moving the meat box by inertia and the braking time, respectively.

According to the present invention, the reciprocating speed of the meat box 3 is detected, and the delay time from when the protrusion 13 passes the detector 14 until the power to the motor is cut off is automatically adjusted accordingly, and the power is cut off. After that, the meat box is moved by inertia during the time _T1 , and the meat box 3 is braked during the constant braking time _T2 , so that the meat box reciprocating speed is Even when the variable speed range is widened, the meat box 3 can be accurately stopped at the front stop position.

Furthermore, since the time _T1 and the braking time _T2 are constant, the circuit configuration of the timer can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of a meat cutter equipped with a meat box front position stop control device of the present invention, and FIG. 2 is a side view of the front stop position approach detection section of FIG. Fig. 3 is a block diagram showing an embodiment of the present invention, Fig. 4 is a charging/discharging characteristic diagram of the capacitor of the speed detecting means, Fig. 5 is a time chart of various signals of Fig. 3, and Fig. 6 is a diagram of Fig. 1. FIG. 2 is an explanatory diagram showing the moving distance, emptying distance, and braking distance of the meat box. 3 is a meat box, 4 is an arm, 5 is a crank, 6 is a meat box drive motor, 7 is a reducer, 8 is a round knife rotation drive motor, 9 is a round knife, 10 is an operation switch, 11
is a speed regulator, 12 is a front stop position approach detection unit,
13 is a protrusion, 14 is a detector, 15 is a set-reset circuit, 18 is an AND gate, 19 and 20 are resistors, 20 is a capacitor, 22 is a comparator, 23, 2
4 is a timer, 26 is a brake unit, and a ₁ and b ₁ are contacts.

Claims (1)

[Claims for Utility Model Registration] A clamp mechanism is connected to the output shaft of a reducer connected to an electric motor through a variable speed means, and a meat box is reciprocated through the clamp mechanism, and the meat box is reciprocated by the reciprocation. In a meat cutting machine that is equipped with a braking means to feed the meat blocks stored in the box to the round cutter side one by one for cutting and to stop the meat box at the near stop position after the cutting operation, the meat box is stopped from the near stop position. A protrusion is attached to the output shaft of the reducer, which is detected by a detector when the meat box approaches a distance L and then moves forward by a distance L ₁ (L ₁ <L). A front stop position approach detection means outputs a pulse signal having a pulse time inversely proportional to the reciprocating speed of the meat box by detecting the protrusion, and an electric motor A delay time adjustment means is provided to automatically adjust the delay time until the electric power is cut off, and the meat box is inertially moved for a certain period of time _T1 after the electric power of the electric motor is delayed and cut off according to the output signal from the adjustment means. and then for a certain period of time
A front stop device for a meat cutter, characterized in that the front stop device for a meat cutter is provided with a time limit means for operating the braking means for a time period T ₂ to stop the meat box at a predetermined front stop position.