JPH02290699A - Electronic type crank angle gage - Google Patents

Abstract

PURPOSE:To grasp stopping of a press in clear at a glance by forming an indicator with two color luminous elements, inputting an angle signal and the set angle signal and switching the luminescent color when rotating angle of a crank shaft equals to the set angle. CONSTITUTION:In an indicating unit 13, driving signal is inputted based on the angle signal in a crank angle detector 11. At the same time, a luminescent color switching means 20 compares the inputted angle signal with check range of transfer movement (set angle signal), and when the crank angle is decided to be in the check range, the indicator luminescent color in the indicating unit is switched. The indicator shows the crank angle changing at every moments and also changes to the other color in the check range. The cause of stopping the press can be so decided in clear at a glance that when the color of the indicator shown at the time of stopping the press is the ordinary color, this is accident of the machine side and when the color of the indicator is the specific color, this is the setting miss in the check range. By this method, investigation of the cause and restorating work of production can be easily and quickly executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic crank angle meter. [Prior Art] A crank angle meter is a device that indicates the rotation angle of a crankshaft, and is required to be equipped according to power press machine structure standards.

In view of the purpose of this standard, which states that it should be installed in an easily visible location,
Electronic crank angle meters are more widely used than mechanical ones. A conventional electronic crank angle meter consists of a crank angle detector that detects the rotation angle of the crankshaft and a display unit that visually displays the crank angle based on the angle signal of the crank angle detector. Generally, the unit is configured to digitally display the crank angle by forming the display body from, for example, a 7-segment LED. For operational purposes, for example, when setting the crank angle to 180 degrees for model matching, or when setting the crank angle to 0 degrees for the so-called "Anichi" operation mode, the angle should be read. Used. By the way, in a press equipped with a so-called transfer machine side that automatically transfers workpieces between molds, etc., the operating range of the transfer machine side, that is, the transfer area, is adjusted by the crank angle to avoid interference with the molds, pilot bin, etc. It is regulated within a certain range in relation to This regulation applies specifically to transfer area setters consisting of rotary cam switches, digital switches, etc. (for example,
This is done by setting the crank angle to 270 to 90 degrees. Generally, a transfer control means including the transfer area setting device outputs a transfer completion signal and shifts to continuous press operation. Since problems with the transfer AM, mistakes in setting the angle with the transfer area setter, etc. may occur, many models are equipped with means for confirming transfer completion as a safety device. This transfer completion confirmation means determines whether or not a transfer completion signal is output from the transfer control means in an area outside the transfer area (check area), and stops the press if the transfer operation is not performed normally. It is generally designed to output a signal. The checking area in the darning means is also set specifically (for example, the angle of the crankshaft is 91 to 150 degrees) using a digital switch or the like in relation to the press speed and the like. Therefore, if the transfer area (crank angle range) is set to avoid interference with the mold, etc., and the check area (crank angle range) is set in relation to the press speed, etc., transfer Press operation continues only when the workpiece is automatically transported normally by the operation of the mechanism, and in other cases, the press is stopped to ensure safety. [Problem to be solved by the invention] However, although the press equipped with the above transfer control means and transfer completion confirmation means can avoid the occurrence of defective products and damage to the equipment, once the press stops, investigation of the cause and restoration work are complicated and numerous. The problem is that it takes time and effort. In other words, since both the transfer area and the check area are set manually using digital switches, etc., there may be errors in setting the transfer area, mistakes in setting the check area, and even gaps between the set transfer area and the set check area due to error or oversight. In some cases, this may occur or both areas may be set to overlap significantly. Additionally, the press is generally configured to stop in the event of a failure of the transfer mechanism itself. Therefore, once the press is stopped, it will not be possible to determine whether there was a mistake in setting each area or whether there is a failure in the transfer machine itself unless the press is individually checked. Moreover, since many people tend to be convinced that their settings are normal, they often start checking the configuration of a transfer machine or other machine. This requires more effort to disassemble and assemble, and it is also unfavorable from a safety point of view as it requires access to a complex press with high packaging density, and there is a high risk that production restoration will be further delayed. SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic crank angle meter that can quickly and accurately determine the cause of press stoppage by visual inspection. [Means for Solving the Problems] The present invention focuses on the fact that a crank angle meter is indispensable for a press and is mounted at a position where it can be easily seen, and by changing the luminescent color of the display body. It is designed so that it can be determined at a glance whether the cause of the press stoppage is an abnormality on the machine side or an error in setting operations. That is, in an electronic crank angle meter having a crank angle detector and a display unit formed including a plurality of display bodies that visually display the crank angle based on the angle signal of the crank angle detector, the display body is formed from a two-color light emitting element, the angle signal and a setting angle signal defining a check area of the transfer operation are input, and when the rotation angle of the crankshaft is equal to the setting angle, it corresponds to the rotation angle of the crankshaft. It is characterized by being equipped with a light emitting color switching means for switching the light emitting color of the display. [Function] In the present invention, a drive signal based on an angle signal from a crank angle detector is input to the display unit. At the same time, the emitting color switching means compares the input angle signal with the transfer operation check area (setting angle signal), and when it is determined that the crank angle is within the check area, changes the display emitting color of the display unit. Switch. Therefore, the display body displays the crank angle that changes from time to time, and also lights up in other colors within the check area. Therefore, the cause of the press stop can be determined at a glance, such as if the display displayed when the press stops is a normal color, indicating a failure on the machine side, or if it is a specific color, indicating a setting error in the check area. [Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

An electronic crank angle meter 10 consisting of a crank angle detector 11, a driver 12, and a display unit 13 is not provided with a light emitting color switching means 20.

The crank angle detector 11 is connected to a crankshaft (not shown), detects the crank angle, and outputs a 10-bit (BCD) angle signal θ. A driver 12 outputs drive signals D14 and D15 to the display unit 13.

Here, the display unit 13 has seven segments L and E.
A 7-segment display body 14 for three digits formed from D and 36 rod-shaped display bodies 15 arranged at equal intervals every 10 degrees (the figure is simply shown every 45 degrees). It is provided. Each rod-shaped display body 15 is formed from a two-color light emitting element. This embodiment includes a red display body 16 and a green display body 17 which are LEDs.

The two-color light-emitting element in the present invention means a structure that can be visually identified by an operator as two colors, and is not limited to a combination of two monochrome light-emitting elements of different colors. For example, it may be formed from two homogeneous white light emitters and windows of different colors. In this embodiment, two types of display bodies, the 7-segment display body 14 and the bar-shaped display tree 15, are provided, but the display body may be configured to include only one of the display bodies. When only the 7-segment display body 14 is used, some or all of the segments can be formed as two-color light-emitting type. Therefore, the driver 12, based on the angle signal θ,
A drive signal D14 for driving the 7-segment display 14 to digitally display the crank angle every 1 degree, and a drive signal D15 for driving the rod-shaped display 15 to display the crank angle every 10 degrees by lighting. It is designed to generate and output. Next, the emitted light color switching means 20 is formed of a switching signal generating circuit 21 and a color switching circuit 22.

The switching signal generation circuit 21 inputs the angle signal θ from the crank angle detector 11 and the setting angle θC from the transfer completion confirmation means 40, and outputs the switching signal S when the crank angle θ is equal to the setting angle change signal θC. It is formed as something that does. The switching signal generation circuit 21 of this embodiment is as follows:
It includes a plurality of comparators with threshold values set in advance, and is configured to switch to the corresponding comparator when a set angle signal θC is input. Here, the transfer completion confirmation means 40 that inputs the setting angle signal θC to the switching signal generation circuit 21 and the transfer drive control means 30 that applies the transfer operation completion signal e to this means 40 are basically the same as the conventional structure. ．． That is, the transfer drive control means 30 is formed from a transfer area setter 31 and a drive control circuit 32, and the drive control circuit 32 determines the transfer setting angle θ (for example, 270 to 90 degrees) from the setter 31. A transfer drive signal CON is output to the side of a transfer n (not shown), and a signal e is output after self-diagnosing that the transfer operation has been completed. on the other hand,
The transfer completion confirmation means 40 includes a check area setting device 41 formed from a digital switch and a setting angle θC (for example, a crank angle of 90 to 1
20 degrees), a transfer operation check circuit determines that the workpiece transfer operation is not being performed normally and outputs a press stop signal s'rp to a control device (not shown). It consists of 42.

Next, in color switching time #122, when the switching signal S is inputted from the switching signal generation circuit 21, a signal D16 for driving the red display element 16 is applied, and when the switching signal S is not inputted, a signal D17 is applied for driving the green display element 17. In other words, for crank angles that are within the check area, the corresponding display is displayed in red. Next, the effect will be explained. Set the setting angle θt to 270 on the transfer area setter 3l.
Consider a case where the angle is set to 90 degrees and the check area setter 41 is set to 91 to 150 degrees. Transfer drive control means 30 (drive control circuit 32)
From there, a transfer drive signal CON is output to a transfer mechanism (not shown), and the workpiece is transferred to the mold. Further, the transfer completion confirmation means 40 (transfer operation check circuit 42) includes the check area 1 projector 4
If the transfer operation completion signal e is not input within the set angle θε set in step 1, the determination function is to output a press stop signal STP to a control device (not shown). Here, when the press is started, an angle signal θ is inputted to the driver 12 from the crank angle detector 11. The driver 12 receives a signal D that drives the 7-segment display 14.
14 and a signal D15 for driving the rod-shaped display body 15. At the same time, the angle signal θ and the setting angle signal θC are input to the emission color switching means 20. Then, the switching signal generation circuit 21 compares both signals θ and θC, and when the angle signal θ is within the set angle signal θC, outputs the switching signal S to the color switching circuit 22 (for example, at a high level). do. The switching signal S is not output when the angle is outside the check area, that is, when the angle is outside the set angle θC. Here, the color switching circuit 22 outputs a signal D16 for driving the red display body 16 only when the switching signal S is input, and outputs a signal D17 for driving the green display body 17 in other cases. Therefore, as the crankshaft rotates, the display unit 13 digitally displays the crank angle on the 7-segment display 14, and displays the crank angle in red when it is within the check area on the bar-shaped display 15. The remaining cases are displayed in green. Here, if the press is stopped, for example, 11
When the red display 16 is lit, such as at 5 degrees, there is a mistake in the angle setting in the transfer area setter 31 to the extent that it overlaps the setting angle θC in the checkbook area setting device 41, or there is a problem with the transfer mechanism itself. It can be determined that it is a mechanical/electrical failure. On the other hand, when the green display 17 is lit, for example at 80 degrees, the set angle θ
Since the press stopped within t, it can be determined that the transfer R is at fault. The crank angle when the vehicle is stopped can be accurately read in degrees on the 7-segment display 14.

According to this embodiment, the display body is formed from a two-color light emitting element and the light emitting color switching means 20 is provided, so that the red display body 16 is displayed within the check area, and the green display body 17 is displayed in the rest of the check area. Since the crank angle is displayed in different colors, it is easy to visually check the crank angle meter (display unit 13) to determine if the cause of the press stop is a failure of the transfer mechanism.
For example, misgrip, misfeed, etc.) or setting angles θt, θC can be determined at a glance, eliminating unnecessary disassembly and assembly, allowing for accurate and quick cause confirmation and production. Restoration work can be accomplished. In addition, since the display in different colors is performed using the bar-shaped display body 15, the set angle θC of the check area can be clearly displayed and can be easily confirmed without paying special or strict attention. Further, the switching signal generation circuit 21 of the luminescent color switching means 20 is
Since the configuration includes multiple comparators for each set angle θC, any set angle θC can be quickly confirmed, and the rod-shaped display body 15 is displayed in the corresponding color at the moment the signal D15 from the driver 12 is output. It can be displayed immediately and is ideal for speeding up presses. [Effects of the Invention] The present invention has a configuration in which the display body is formed from two-color light emitting elements, and is provided with a light emitting color switching means for color-coded switching of the crank angle when it is within the transfer operation check area and when it is outside the transfer operation check area. Therefore, it is possible to clearly determine whether the press has stopped due to a failure of the transfer mechanism or a mistake in the setting of the check area, etc., and the cause investigation and production restoration work can be carried out easily and quickly, and smooth and stable press operation can be achieved. We can provide an electronic crank angle meter.

[Brief explanation of drawings]

The figure is an overall configuration diagram showing one embodiment of the present invention. 10・
...Crank angle meter, 11...Crank angle detector, 13...Display unit, 14...7 segment display, I5...Bar-like display, 16...Red display, 17...・Green display body, 20... Emission color switching means, 21... Switching signal generation circuit, 22... Color switching circuit,

Claims (1)

[Claims] (1) In an electronic crank angle meter having a crank angle detector and a display unit formed including a plurality of display bodies that visually display the crank angle based on the angle signal of the crank angle detector, the display includes: The body is formed from a two-color light emitting element, the angle signal and a setting angle signal defining a check area of the transfer operation are input, and when the rotation angle of the crankshaft is equal to the setting angle, it corresponds to the rotation angle of the crankshaft. An electronic crank angle meter characterized by being provided with a light emitting color switching means for switching the light emitting color of a display body.