JPS6218396Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to stopping a meat box in a front position in a meat cutting machine.

A conventional meat cutter with a front-position stop device has a protrusion on the rotating shaft of the crank that reciprocates the meat box, and a drive system for reciprocating the meat box using detection means such as a micro switch or a proximity switch. is braking.

With this mechanism, regardless of the reciprocating speed of the meat box,
Since the idle time from the stop of the electric motor to the start of braking and the braking time are constant, there is a large difference in the moving distance of the meat box during the idle time, and there is also a difference in the braking distance, so when driving at low speed, the meat box is moved to the front position. There is a problem that the meat box stops before reaching the front stop position, and during high-speed operation, the meat box stops at a position past the front stop position.If the meat box does not stop at the front stop position, the entire width of the meat loaf is
It becomes impossible to cut, and the meat is wasted. In order to correct the front stopping position of the meat box, it was necessary to adjust the position of the protrusion a little.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art and improve the accuracy of the front stopping position of the meat box.

The present invention focuses on increasing/decreasing the drive start delay time of the braking means and the driving time of the braking means according to the reciprocating speed of the meat box. This system is equipped with an exchange means for converting into an electric signal and a braking means driving device for driving the braking means.

An embodiment of the present invention will be described. FIG. 1 is a front view showing a schematic configuration of a meat cutter. Two parallel sliding members 2 are arranged on the upper surface of the support member 1, and reciprocating movement is performed on the sliding members 2 (in the front and back direction in the figure).
A meat box 3 is supported and fitted. One end of an arm 4 is rotatably supported at the bottom of the meat box 3, and the other end of the arm 4 is rotatably supported by a crank 5. The electric motor 7 is a meat box reciprocating electric motor (hereinafter abbreviated as _M1 ), and is connected to the speed reducer 6 by a power transmission means such as a belt. The crank 5 is fitted onto the output shaft of the reduction gear 6. The rotation of _M1 causes the crank 5 to rotate via the reducer 6, and further allows the meat box 3 to reciprocate via the arm 4. The electric motor 8 is a round blade rotating electric motor (hereinafter abbreviated as _M2 ), and rotates the round blade 9 using a power transmission means such as a belt. By operating the operation switch 10,
M ₂ and M ₁ are activated, the round cutter 9 rotates, and the meat box 3 is reciprocated to cut the meat loaf stored in the meat box 3 continuously or intermittently. can. By operating the speed regulator 11, the reciprocating movement of the meat box 3 can be adjusted. (Detailed explanation of the speed adjustment mechanism will be omitted, but it may be a means such as a general continuously variable speed pulley.) A projection piece 12 is fixed to a suitable position on the output shaft of the reduction gear 6, A detector 13 for detecting the presence or absence of the protruding piece 12 is fixed at a proper position on the support member 1. Here, the protruding piece 12 and the detector 13 are detection means for sensing the approach of the meat box 3 to the front stop position.

Next, the mechanism for stopping the meat box 3 in the front position of the present invention will be explained with reference to the block circuit diagram shown in FIG.

The flip-flop 15 changes its output to "L" depending on the rising edge of the output signal of the operation switch 10.
to "H". The "H" signal energizes the drive circuit 24 of M ₁ and M ₂ via the amplifier 23 to rotate M ₁ and M ₂ , rotate the round knife 9, and reciprocate the meat box 3. , the meat will be cut into pieces. Here, the drive circuit 24 is constituted by an electromagnetic relay, a semiconductor switch, etc. connected in series to the power circuits (not shown) of M ₁ and M ₂ . AND gate 16 is operation switch 1
0, flip-flop 15, and detector 13
input is input, the output of flip-flop 15 is "H", and the output signal of operation switch 10 is "H"
The output signal of the detector 13 is output to the next stage circuit only after the signal is inverted from "L" to "L". That is, after starting M ₁ and M ₂ once, the operator returns the operation switch 10 to the original position to stop cutting the meat, and then the meat box 3 approaches the front stop position for the first time. This is sensed by the detector 13 and the signal is transmitted to the AND gate 16 and subsequent circuits. The falling signal of the AND gate 16 that is inverted from "H" to "L" resets the flip-flop 15, and its output signal is inverted from "H" to "L". The "L" signal cuts off the power to M ₁ and M ₂ via the amplifier 23 and the drive circuit. On the other hand, due to the falling signal of the AND gate 16, the timer 17
is driven to output an "H" pulse signal for a certain period of time (T ₀ ). In response to the "H" signal, contact b is opened and contact a is closed at the same time, and the capacitor 20 is charged from the circuit power supply Vcc via the contact a variable resistor 14 and resistor 18. Charging voltage of capacitor 20 V ₂
has the characteristics as shown in FIG. The faster the reciprocating speed of the meat box 3 is, the smaller the resistance value of the variable resistor 14 is, and the faster the charging voltage _V2 rises. In Figure 3, T _A , T _B , and T _C are respectively high and
This is the braking delay time during medium and low speed operation, and T _A < T _B
＜T _C.

The variable resistor 14 is designed so that its resistance can be changed in conjunction with the operation of the speed regulator 11, and is used to convert the resistance into an electrical signal according to the operating speed of the meat box 3. It has become a means.

The charging voltage V ₂ of the capacitor is compared by the comparator 21, and when V ₂ <V ₁ , the comparator 21
The output signal of is inverted from "L" to "H". The outputs of the timer 17 and comparator 21 are input to the AND gate 22, and as shown in the time chart f in FIG. 4, after the "H" signal, that is, the braking delay time T, the braking time T' (=T ₀ - The "H" signal of T) is obtained. Therefore, the braking times at high, medium, and low speeds are (T ₀ - T _A ), (T ₀ - T _B ), and (T ₀ - T _C ), respectively.
(T ₀ −T _A )>(T ₀ −T _B )>(T ₀ −T _C ). The output signal “H” of the AND gate 22 causes the amplifier 2 to
5, the brake section 26 is driven to stop the meat box 3 at the front position.

Here, the braking unit 26 is an electromagnetic brake, a motor with a brake, or a device that causes direct current to flow through the windings of the motor.

When the output signal of timer 17 becomes “L”, contact a
opens and contact b closes, so the charge accumulated in the capacitor 20 passes through the resistor 19 and the contact,
It is discharged and then ready for the near position stop operation.

Including the variable resistor 14, contacts a and b, timer 17, resistor 18, capacitor 20, comparator 21 and AND gate 22 automatically adjust the braking delay time and braking time according to the reciprocating speed of the meat box 3. This circuit and the amplifier 25 together constitute a braking means driving device.

As explained above, according to the present invention, by shortening the high-speed movement time, the braking delay time, shortening the free movement distance of the meat box 3, and increasing the braking time, the meat box 3 can be stopped before it stops. Position accuracy can be improved.

According to the present invention, as a conversion means, a variable resistor is used as a charging resistor, and the time constant of the resistor and capacitor is changed to automatically adjust the braking delay time. The reference voltage of the comparator 21 is set by the variable resistor of
The same effect can be obtained even if V ₁ is varied depending on the reciprocating speed of the meat box 3.

According to the present invention, a converter that converts into an electric signal is provided in conjunction with the speed regulator 11 that changes the reciprocating speed of the meat box 3, and the braking delay time is adjusted in proportion to the reciprocating speed of the meat box 3. Since the braking time is made short and long, the accuracy of the front stopping position of the meat box 3 can be improved.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing an embodiment of the present invention, FIG. 2 is a block circuit diagram, FIG. 3 is a capacitor charging characteristic diagram, and FIG. 4 is a time chart. In the figure, 10 is an operation switch, 11 is a speed regulator, 12 is a protrusion, 13 is a detector, 14 is a converter, 15 is a flip-flop, 16 and 22 are AND gates, 17 is a timer, 18 and 19 are resistors, 2
0 is a capacitor, 21 is a comparator, 23 and 25 are amplifiers, 24 is a drive circuit, and 26 is a braking section.

Claims (1)

[Scope of utility model registration request] It has a variable speed means that can adjust the reciprocating speed of the meat box storing the meat loaf, and the meat box is reciprocated to cut the meat loaf with a rotary knife, and after the cutting operation, the meat box is moved to the front position. The meat cutter has a braking means for stopping the meat cutter when the meat box approaches a front stop position, and a conversion means for converting the manipulated variable of the variable speed means into an electrical signal having an output corresponding to a reciprocating speed of the meat box, and a meat box approaching a front stop position. a near stop position approach detecting means that detects that the braking means has stopped and issues an output signal; and a drive delay time of the braking means that starts operating upon receiving the output signal of the detecting means, and a drive delay time of the braking means according to the electric signal of the converting means; and a braking means drive device that automatically adjusts the drive time according to the reciprocating speed of the meat box.