JPS61230021A - Inspecting instrument - Google Patents

Abstract

PURPOSE:To prevent deviation of a reference set value by a mechanical impact at the time of measuring by preventing contacting of a dimension measuring means with an object to be measured. CONSTITUTION:A carriage base 1 conveyed in a specific direction on a rail 2 is first confirmed on its existence by existence detectors 4 and 5 and its height dimensions are measured by a dimension measuring instrument 3. Then, in case the height dimensions of the carriage base 1 are decided to be out of the allowable limits at this stage by a comparing and deciding circuit 7, a rail 9 is moved and the carriage base 1 is removed from a conveying line at a point of time when it is detected that the carriage base 1 is conveyed to the position of the rail 9 by an existence detector 8. Accordingly, since the dimension measuring instrument 3 does not contact with the carriage base 1, the mechanical impact at the time of measuring is not transmitted to the dimension measuring instrument 3 and the reference set value is not deviated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an inspection device for inspecting a carriage base on which a magnetic head of a magnetic disk device is mounted, for example, at a pre-shipment stage.

[Technical Background of the Invention] In general, a carriage base on which a magnetic head of a magnetic disk device is mounted is, for example, as shown in FIGS. 2 and 3.
It has a configuration in which a roller 1b with a ball bearing is attached to a base 1a. This carriage base has a function of moving the magnetic head, and the height dimension from the lower end of the roller 1b to the surface of the base 1a to which the magnetic head is fixed needs to be particularly accurate.

Conventionally, product inspection before shipment of this carriage base has been carried out as shown in FIG. 4, when the carriage base 1 is placed on the rail 2, the base of the carriage base 1 is This was done by measuring the height to the surface of 1a with an indicator or dial gauge.

[Problems with the prior art] However, since the conventional inspection method of measuring the height of the carriage base 1 with an indicator or dial gauge is a contact inspection, mechanical shock is transmitted to the measuring instrument and the reference setting is affected. There were problems in that it was difficult to automate the inspection because the values were easily distorted and the measured dimensions could not be output as electrical signals. Even higher mIII
There are limits to the measurement of dimensions.

[Purpose of the Invention] The present invention was made to solve these problems, and it is possible to automate inspection by extracting dimension measurement values as electrical signal output. The purpose of the present invention is to provide an inspection device that can carry out highly accurate dimension measurements.

[Summary of the Invention] In other words, the inspection apparatus of the present invention includes a conveyance means for conveying an object to be measured in a fixed direction, a height dimension from a reference point to the object to be measured in a non-contact manner, and output as an analog signal. a sensing means for sensing the presence of the object to be measured and executing and interrupting the measurement; a signal converting means for converting an analog signal outputted from the dimension measuring means into a digital signal; a determination unit that outputs a determination signal indicating whether or not the height dimension of the object to be measured is within an allowable range by comparing it with a reference signal indicating an upper limit value and a lower limit value of the height dimension set in advance; It is characterized by comprising a removing means that senses the presence of the object to be measured whose height dimension has been determined, and removes the object to be measured whose height dimension is outside an allowable range based on the determination signal. There is.

[Embodiments of the Invention] Hereinafter, details of embodiments of the present invention will be described based on the drawings.

FIG. 1 is a side view showing the configuration of an embodiment of the present invention.

In the figure, 1 is the carriage base of the magnetic disk device that is the object to be measured, and 2 is the carriage base 1 used during the inspection process.
3 is the rail that transports the carriage base 1 from the reference point.
A dimension measuring device using an optical sensor that non-contactly measures the height dimension up to and outputs an analog signal according to the dimension, 4
and 5 is a presence detector using an optical sensor that senses the presence of the carriage base 1 and executes and interrupts height measurement. Further, 6 is an A/D converter that converts the analog signal output from the dimension measuring device 3 into a digital signal.

The circuit 7 compares this digital signal with a reference signal indicating the upper and lower limits of the height dimension of the main 1/ridge base 1 set in advance, and determines whether the height dimension of the carriage base 1 is within the permissible range. A comparison and determination circuit 8 outputs a determination signal indicating whether the height dimension of the carriage base 1 has been determined and a presence detector using an optical sensor detects the presence of the carriage base 1 whose height dimension has been determined. 9 is a movable rail; 10 is a movable rail 9;
This is a drive device equipped with a cylinder that removes a carriage base 1 whose height dimension is outside the permissible range from a conveyance line.

In the inspection apparatus of this embodiment configured as described above,
Carriage base 1 transported in a fixed direction on rail 2
First, the presence detectors 4 and 5 confirm its existence, and the dimension measuring device 3 measures its height. At this stage, the comparison/judgment circuit 7 determines whether the carriage base 1
If it is determined that the height dimension of the carriage base 1 is outside the allowable range, the drive device 1
0 operates, the rail 9 moves, and the carriage base 1
is removed from the conveyor line. On the other hand, if it is determined that the height dimension of the carriage base 1 is within the allowable range, the drive device does not operate.

The carriage base 1 is transported to the final shipping process.

However, in the inspection device of this embodiment, since the dimension measuring device 3 does not come into contact with the carriage base 1, the mechanical shock during measurement is not transmitted to the dimension measuring device 3, and the reference setting values are not deviated. . Furthermore, since the output of the dimension measuring device 3 is an electrical signal, it is possible to automate the process. Furthermore, since the dimension measuring instrument 3 is capable of more accurate reading than dimension measuring instruments such as indicators or dial gauges, inspections can be carried out reliably and stably.

[Effects of the Invention] As explained above, according to the inspection apparatus of the present invention, the dimension measuring means does not come into contact with the object to be measured, so that there is no deviation in the reference set value due to mechanical impact during measurement.

Furthermore, since the dimension measurement values are output as electrical signals, it is easy to automate the inspection process and it is possible to stably perform highly accurate dimension measurements.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of the inspection device of the present invention;
Figures 2 and 3 are side and front views showing the shape of the carriage base, which is the object to be measured in the apparatus shown in Figure 1, and Figure 4 is a diagram showing the height dimension from the reference point to the carriage base. It is. 1・・・・・・・・・・・・・・・ Carriage base 1
a-...Base 1b...Ball bearing 2.9
・・・・・・・・・Rail 3・・・・・・・・・・・・Dimension measuring device 4.5.
8...Presence detector 6...A/D converter 7...
......Comparison judgment circuit 10...
・・・・・・・・・・・・Driving device Fig. 1 Fig. 2 Fig. 3 Fig. 4

Claims (2)

[Claims] (1) A transport means for transporting the object to be measured in a certain direction, a dimension measuring means for non-contactly measuring the height dimension from a reference point to the object to be measured and outputting it as an analog signal, and the object to be measured. a sensing means for sensing the presence of the dimension measuring means to execute and interrupt the measurement; a signal converting means for converting an analog signal outputted from the dimension measuring means into a digital signal; and a signal converting means for converting the analog signal output from the dimension measuring means into a digital signal; determination means for outputting a determination signal indicating whether or not the height dimension of the object to be measured is within an allowable range by comparing the height dimension with a reference signal indicating the lower limit value; 1. An inspection apparatus comprising: a removing means that senses the presence of an object to be measured and removes the object whose height is outside an allowable range based on the determination signal. (2) The inspection device according to claim 1, wherein the object to be measured is a carriage base on which a magnetic head of a magnetic disk device is mounted.