JPS58208613A - Length measuring device - Google Patents

Abstract

PURPOSE:To improve water resistant property and dust resistant property in a simple constitution, by supplying a gas including oil to the inside of a cabinet of a device from outside, and making the inner pressure of the device higher than the outer pressure. CONSTITUTION:A length measuring device is constituted by a head assembly 41 comprising a slider 42, a head attaching plate 43, a head supporting member 44, and the like, a detecting head 45, a scale 46, and the like. Then, a groove 50, wherein a lead wire 49 for the detecting head 45 is contained, and holes 51 and 51' are provided in the slider 42. Pipes 52 and 52' are attached to the device. When high pressure air contg. oil in a sprayed state is supplied from the pipe 52, the inner pressure of a case 47 becomes higher than the outer pressure through the groove 50 and the pipe 52. At the same time, lubricating oil is always supplied to the scale 46. Therefore, water resisting property and dust resisting property are improved in a simple constitution. The device is suitable for process measuring which is required for the automation of machining operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vernier device, particularly a vernier device whose dust and water resistance has been compromised.

With the advancement of automation in machining, the demand for in-process measurement or inter-process measurement using various vernier devices is increasing.

However, on the other hand, in order to improve grindability and machinability, various types of l+s, soluble grinding fluids, cutting fluids, etc. are being used. Therefore, the vernier device must be used in a dusty environment for in-process measurement or inter-process measurement, under adverse environmental conditions such as falling cutting fluid, splattering grinding fluid, or liquid spray. However, although conventional vernier devices are equipped with various dust-proof and drip-proof measures, they are not perfect (they have the disadvantage that their functionality can be impaired by the intrusion of grinding fluid, cutting oil, dust, etc.). .

Examples include electrical short circuits in the detection head transmission system due to intrusion of electrolytic cutting fluid, corrosion and disconnection of lead wires from the detection head due to immersion in scaly cutting fluid, etc.

Therefore, in order to solve the drawbacks of the prior art, the internal pressure of the vernier device is made higher than the external pressure by supplying gas from the outside into the vernier device, making it water resistant and dust resistant. A vernier device suitable for in-process measurement or inter-process measurement of 21D machines has been proposed even under environmental conditions.

FIG. 1 shows an example of such a plunger-type length measuring device. The amount of relative movement between them is detected as a scale signal and taken out to the outside via a cable 5. Since the structure itself is well known, detailed explanation will be omitted.

The main opening of this vernier device is the spindle bearing part 6.
and the cable clamp part 6, the spindle@receiving part 5 is sealed with an oil seal ring or an O-ring 7, and the cable clamp part 6 is sealed with a punching 8.

Now, the housing 3 is provided with an intake port 9, and air at a predetermined pressure is supplied into the housing 3 by valving the tube 10. The pressure of this air is set at least higher than the external pressure of the environment in which the vernier device is used.

Note that there are communication holes 13. in the detection head holding ill in the housing 3, the spindle bearing part (spring bearing) 12, etc., respectively.
14 to equalize the internal pressure within the housing 3.

By increasing the internal pressure within the housing of the plunger type measuring device relative to the external pressure in this way, it is possible to effectively prevent oil, water, dust, etc. from entering from the outside.

Similarly, the second example 1 is an example of a cylinder ti measuring device, which includes a magnetic scale 21 fixedly installed in a housing A, and a detection head fixed at one end of a housing B that is movable with respect to the inside of the housing A. The phase symmetry #JJ'ji of is detected as a scale signal and taken out to the outside via cable n. The main opening of this device is the fitting 824 between the casings A and B, and this part is sealed to some extent with an O-ring or an oil seal 1) with a puffer 5 or the like.

Now, in this case as well, the housing A (or B) is provided with an inlet portion K, and gas at a predetermined pressure is supplied from the outside into the housing via the tube Z. Incidentally, a communicating hole is formed in the cylinder ring 3 in the case A.

The air pressure within each volume is equalized with the relative movement of H7.

With the configuration described above, some gas inside the housing leaks to the outside through the seal portion 5, but since the internal pressure inside the housing is maintained at a high level relative to the external pressure, water, oil, It can prevent the infiltration of dust, etc.

Figure 3 further shows a linear digital measuring device.
The scale signal is detected by the relative movement between a magnetic scale 32 fixedly installed in the case 31 and a detection head held on a head mounting plate 33. A seal member made of an elastic material such as rubber, sponge, metal sheet, etc. is provided at the opening of the case, and has a certain degree of sealing effect.

The case 31K is provided with an intake port 37 at a suitable position, and gas at a predetermined pressure is supplied into the case from the outside through a tube 38. Therefore, although there is some gas leakage through the seal, the internal pressure of the case is higher than the external pressure, so water, oil, dust, etc. can be prevented from entering from the outside.

This product further improves the vernier device described above, and by configuring it to supply high-pressure gas containing oil into the device proof body, the system for supplying lubricating oil to the scale has been refined, and the dust-proofing effect has been further improved. The purpose is to measure.

The present invention is illustrated by referring to the actual examples shown in the drawings below.
In FIGS. 4(al) and 4(b), reference numeral 41 indicates a head 7 assembly, which includes a slider 4z, a head mounting plate 43, a head support member 44, etc.

The slider 42 is placed on the head plate 43, and the -
The rad handle &43 supports the detection head 45 by controlling the head support section, and a school 46 that moves relative to the head passes through these members.

Further, the detection head 45 and the scale 46 are housed in a case 47, and the head receiving plate 43 and the case opening 48 are housed in a case 47.
A whitening sealing member 48 is optically filled in between to obtain a certain degree of sealing effect.

Normally, the slider 42 is formed with a groove into which the lead fih 49 of the detection head is inserted. Therefore, in the real tsM Shio, this groove is used as a flow path for high-pressure gas.

Then, drill a large 51° 51' hole in the slider that connects to the groove, and attach a pipe 52 and 52 to each hole.

It is recommended that a gas leak be applied to the gap between the slitter 42 and the hend mounting plate to reduce gas leakage.

Is it configured like the above? If a mist of oil such as pressure A is supplied from the pipe 52, between the grooves and the pipe 5.
2, the internal pressure of the case 47 depends on the cylinder < 1 from the external pressure. Furthermore, the lubricating oil can also be supplied to the scale 46 at the same time.

This oil also has a dehydrating effect on scale surfaces.

It is also possible to supply a gas containing oil into the direct sales case from the Pulp Association, Koma'.

From the above several examples, 1. Thus, Mokuji Akira has excellent water resistance and double-layered properties due to its relatively simple structure, and is highly sought after for the automation of machining. D) It is possible to provide an effective deterrent device.

However, the present invention can only be used for tearing the measuring device of the type that is shielded.
It can be applied to various devices such as rotary scales, rotary encoders, and electric micrometers, and similar effects can be obtained. In addition, especially when the groove of the slider is used to carry a gas containing oil into the device, it is effective in preventing dust from the lead line area outlet M.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an example of the Blangy 1-type side and equipment, and Figs. 2 and 3 are large cylinder type and linear type offshore j.
FIG. 4(a) is a schematic diagram showing an example of a scale device. (b) is a schematic diagram showing a practical example of the present invention; FIG. 5(a)
. (b) is a schematic renal diagram showing another embodiment of the present invention. 1...Measuring scale, 2...Scale, 3...
Housing, 4°...Detection head, 9...Intake port, 1o...
·tube. Patent Applicant Sony Magnescale Co., Ltd. Agent Patent Attorney Wed 1) Take Part 3 Figure 4 (0) IP; Figure 5 (0) Procedural Amendment November 1, 1980 Patent Office ij = Tori Chikusugi Mr. Kazuo 1 Indication of the case 1982 t# Grant No. 090903 2 Name of the invention Vernier device 3 Relationship to the case by the person making the amendment Patent applicant Address Name Name Sony Magnescale Closed Company 4 Agent 〒10
5 Address: Shiba 3-chome Building, 3-2-14 Shiba, Minato-ku, Tokyo Telephone: (03) 455-8746 Name: (7238) Patent Attorney Nagai 1) Takeshi Department 5 Details of the invention in the specification subject to amendment Nari 1. E! - and - aspects 6 of A - Contents of the amendment (Opening) Page 2, lines 9 to 12 of Letter of Disapproval: ``It. ... desu.'' is amended to ``ru.''. (2) Correct as shown in the attached sheet in Figure 4, 1alt.

Claims (2)

[Claims] (1) Supplying oil-containing gas from the outside into the device housing,
66 that the internal pressure is configured to be higher than the external pressure.
A vernier device. (2) The oil-containing gas is configured to be supplied to the scale from both sides of the head mounting plate by valving the gas flow path and pipe of the head 7 assembly. Vernier device as described in section.