JPH0348509Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for printing a rank value of an unbalance amount on a test object in an unbalance amount test of a tire or the like.

[Prior Art] In a dynamic balance test of tires, etc., the magnitude of the detected unbalance is ranked, and the rank value is printed on the test object, such as the tire.

In this type of printing device for dynamic balance testers, when selecting characters to be printed, the dial face with rank display characters provided on the circumference is rotated, and the required rank display characters are moved to the printing position. There is. A pulse motor is used as the drive source to rotate the dial.

[Problems to be solved by the invention] However, since the above-mentioned conventional printing device for a dynamic balance tester uses a pulse motor as a drive source in an open circuit, the motor may come off when the friction of the passive shaft increases. There was a problem with the adjustment and the stopping position of the dial being incorrect. Also, when using such a printing device on tires, etc., unlike general printing devices, a pressure of about 1.5 atmospheres (1.5Kg/cm ² ) is required, and if a thermal transfer type is used, the dial cannot be printed. Because the heater heats it to about 100 degrees Celsius, the friction of the passive shaft increases due to thermal expansion, making the above problem likely to occur.

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following configuration.

In other words, a coded display corresponding to the rank display character is provided on the dial or a separate movable board that moves in synchronization with the dial, and a sensor that reads this coded display is equipped with an unbalance amount in advance. A code recorder that stores the rank value of and outputs the stored code signal based on the unbalance detection signal from the main body of the dynamic balance testing machine, and compares the code signal read from the sensor with the code signal from the code recorder. A comparator that calculates
The present invention is characterized in that a control circuit is provided which controls the printing plate drive mechanism to stop when the two signals match based on the output signal from the comparator.

[Function] The dial is moved and positioned by the dial drive mechanism, but when the unbalance amount detection signal from the dynamic balance tester body is input to the code recorder, a code is generated that ranks the unbalance amount. A signal is output. Meanwhile, a sensor reads the rank display section displayed on the dial, and a character code signal is output from the sensor. Both code signals are supplied to a comparator and subjected to a comparison operation. When both signals match, a positioning completion signal is output from the comparator to the dial drive mechanism control circuit, the dial drive mechanism is stopped, and positioning is completed.

[Example] Figure 1 shows a dial 1 in an example device of the present invention.
FIG. 2 is a front view showing the structure of the apparatus, and FIG. 2 is a block diagram showing the structure of the apparatus according to the embodiment.

The dial 1 is attached to the drive shaft of a pulse motor 7 serving as its drive device, and is driven to rotate when selecting characters to be printed. On the circumference of the dial 1, there are printed parts 3 with numbers 0 to 7 indicating the rank value of the unbalance amount, and each printed part 3 is moved to a printing position P by rotationally driving the dial 1. The vehicle stops, and a rank value is printed on a tire or the like (not shown).

Further, the dial 1 is provided with a coded display section 2 corresponding to a number from 0 to 7 indicating the rank value of the unbalance amount on the radius passing through each printed section 3, and this display section 2 is a code hole 4 on a concentric circle indicating each digit number, for example based on a BCD code.
It is formed by providing Regarding the number 0 indicating the base point of the dial 1, a zero point hole 5 is provided outside the concentric circle indicating the number of digits of the BCD code on the display section 2.

At the printing position, dial reading sensors S ₂ to _{S 4} touch each code hole 4 of the code display section 2 formed on the dial 1.
The zero point sensor S ₁ is arranged linearly in the same radial direction as the dial 1 so as to correspond to the zero point hole 5 .

These sensors S ₁ to _{S 4} are composed of optical sensors and detect light passing through the code hole 4 or zero point hole 5 of the dial 1 and determine whether the desired printing section 3 of the dial 1 has moved to the printing position. Determine whether or not.

The dial 1 is rotationally driven by the pulse motor 7 which receives a drive signal from the pulse motor drive circuit 11 when the positioning command switch 8 or the origin command switch 9 is turned on. When the positioning command switch 8 is turned on, the dial reading sensors S ₂ to S ₄ read the code display section 2 formed on the dial 1, and a character code signal B is output and input to the comparator 12. Ru.

On the other hand, an unbalance amount detection signal is transmitted from the dynamic balance tester body 15 (not shown) to the code recorder 13.
is input. The code recorder 13 stores in advance rank values obtained by classifying the amount of unbalance into ranks, and a rank code signal A is outputted in response to this input signal and inputted to the comparator 12.

The comparator 12 compares these input signals A and B, and when the two signals match, a positioning completion signal is output to the pulse motor drive circuit 11 and the drive of the pulse motor 7 is stopped. When the two signals do not match, the pulse motor drive circuit 11 further outputs a drive signal, the pulse motor 7 is driven, and the dial 1 is rotationally driven until both the A and B signals match.

When the origin command switch 9 is turned on, the pulse motor 7 is driven until the sensor S ₁ reads the zero point hole 5 on the dial 1, and when the zero point hole 5 is detected, the origin stop signal is output from the sensor S ₁ . , the driving of the pulse motor 7 is stopped.

In the above embodiment, the code hole 4 is bored in the dial 1, but it may also be formed in a separate movable plate that moves in synchronization with the dial 1 and read by a sensor. The code display portion may be formed by providing a protrusion, and the code is not limited to a BCD code, but may be any code that corresponds to a decimal code or other rank display characters. Further, the sensor is not limited to an optical sensor, and a proximity sensor or the like may be used depending on the configuration of the display section. Furthermore, instead of the above pulse motor and pulse motor drive circuit, an AC motor or
A DC motor and its drive circuit may also be used.

This printing device for a dynamic balance tester reads the code display part corresponding to the rank value of the amount of unbalance formed on the dial 1, and matches the rank value based on the amount of unbalance detected by the tester main body 15. Since the control is performed by a closed loop circuit that drives the pulse motor 7 up to the point where the dial 1 stops, it is possible to eliminate deviations in the stop position of the dial 1.

(Effects of the invention) As explained above, the printing device for a dynamic balance tester according to the invention can accurately stop the dial when printing the rank value of the unbalance amount on a tire, etc. It has become possible to improve stopping accuracy.

[Brief explanation of drawings]

FIG. 1 is a front view showing the structure of a dial in an embodiment of the present invention, and FIG. 2 is a block diagram showing the structure of the embodiment. 1...Dial, 7...Pulse motor, 11...
Pulse motor drive circuit, 12...Comparator, 13 Code recorder _S1 to _S4 ...Sensor.

Claims (1)

[Scope of utility model registration request] It is equipped with a dial with characters indicating the rank of unbalance of the tire, etc., and a dial drive mechanism that moves the dial to the printing position, and prints the rank value of the unbalance amount in the dynamic balance test on the tire, etc. In a printing device for a dynamic balance tester, a coded display part corresponding to a rank display character is provided on the dial or a separate movable board that moves in synchronization with the dial, and the coded display part a code recorder that stores the rank value of the unbalance amount in advance and outputs the stored code signal based on the unbalance amount detection signal from the main body of the dynamic balance tester, and a code signal that is read from the sensor. A comparator that compares and calculates a code signal from a code recorder, and a control circuit that controls the printing plate drive mechanism to stop when both signals match based on the output signal from the comparator. A printing device for a dynamic balance tester featuring: