CN101281014B

CN101281014B - Contact detector

Info

Publication number: CN101281014B
Application number: CN2007100922998A
Authority: CN
Inventors: 福久宣夫
Original assignee: Nisshin Sangyo KK
Current assignee: Nisshin Sangyo KK
Priority date: 2007-04-04
Filing date: 2007-04-04
Publication date: 2011-06-08
Anticipated expiration: 2027-04-04
Also published as: CN101281014A

Abstract

The invention relates to a contact detector mainly applied to detecting a tooling bar and a tool rest of a machine tool in contact with a work-piece (a manufacturing object) so as to measure the position relation thereof. The invention provides a contact detector with simple structure of a supporting couple for limiting a stable position of a detecting probe for manufacture and assembly with high accuracy; the detection accuracy does not change along the change of temperature and repeated use; the three supporting couples for maintaining the detection probe at stable position comprise a first supporting couple with one spot contact, a second supporting couple with two spot contact and a third supporting couple with three spot contacts; the first supporting couple is composed of an radioactive round bar and a round bar in tangential direction of a circle with the detection probe as the centre; the second supporting couple is composed of an radioactive round bar and sphere which is located at two sides of the round bar and has one group with two of which; the third supporting couple is composed of a spherical surface body or a conical surface body and a sphere which is configured on outer circumference at the bottom of the opposite cylinder hole and has one group with three of which.

Description

Contact detector

Technical field

The present invention relates to a kind of device that has as lower member: be installed in the housing on lathe or the measurement mechanism; Make contact jaw from the outstanding detection pin of this housing; And the unit that detected object thing and contacting of described contact jaw are detected.Device of the present invention for example is used for the instrument installation of lathe is measured with the parts (for example throw axle or knife rest) and the position relation of workpiece (processing object thing).

Background technology

Below such contact detector be known: be to form three between the base portion of detection pin of contact jaw to honour at the support unit of being located at enclosure interior and with the front end, the base portion that utilizes the power of spring will detect pin is honoured by being pressed in described three, thereby will detect pin remains on the predetermined settling position, when contact jaw contacts with the metering object, by the detection pin that produces to this contact itself or because of this contact the small mobile electro-detection of carrying out, detect this contact from described settling position.

Such contact detector is used for following situation: the handle (shank) that will be for example be made as one with its housing is installed in the instrument installation shaft (axle of throws such as drill bit or milling cutter is installed) of lathe, worktable or this instrument installation shaft utilizing numerical control (NC) device to make to be equipped with workpiece move, coordinate when utilizing numerical control device to read from contact detector output activation signal, worktable or instrument installation shaft, the relative position relation to instrument installation shaft and workpiece measures thus.

The settling position that detects pin props up to honour by three that form between base portion that detects pin and support unit and limits.About three structures of honouring various schemes have been proposed also.For example, by with the parts of support unit side and detect first that the parts of the base portion side of pin contact on one point honour, second of 2 contacts honour the 3rd of contacting and honour with 3, the axle center that is located to detect pin is each vertex position of the equilateral triangle at center, thus can limit in the three dimensions three axial positions and around the phase place (angle) of these three axles.

Fig. 5 is disclosed structure in clear and 63 years No. 140348 communique at the open communique of Japanese Utility Model, the 1st, detect pin, and the 4th, the support unit of the base portion of supporting detection pin 1.Be provided with flange 20 integratedly on the base portion 2 of former end 11 for the detection pin 1 of contact jaw, on the face of support unit 4 sides of this flange, be fixed with three spheroids 40.It is on each vertex position of equilateral triangle at center that these three spheroids 40 are configured in the axle center of detecting pin 1.On support unit 4, be provided with opposed to each other: the first smooth bearing 45 with each spheroid 40; By second bearing 46 that the groove 42 that radiates direction constitutes, described groove 42 is to form by two parallel bars 41; And the 3rd bearing 47 that constitutes by the recess 44 that between three spheroids 43, forms.By means of to detecting the acting force of pin 1 towards the not shown spring of support unit 4 application of forces, first bearing 45 a bit contacts with a spheroid in the spheroid 40 that detects the pin base portion, second bearing 46 contacts with 2 of another one spheroids in the spheroid 40 that detects the pin base portion, the 3rd bearing 47 contacts with the 3rd 3 of spheroid in the spheroid 40 that detects the pin base portion, and the settling position that detects pin thus is defined.

On the settling position that limits like this, the contact jaw 11 that detects pin in three dimensions three axial positions and be defined around the phase place (angle) of these three axles.When contact jaw 11 contacts with the metering object, detect pin 1 and move the contact separation of certain spheroid and cramp bar minutely because of this contact force.In addition, when contact jaw 11 separated with the metering object, contact jaw 11 turned back to predetermined settling position.

Contact detector is mainly used in the relation of the mutual alignment between the parts such as instrument and workpiece is measured, thereby the position that needs high precision and keep the contact jaw on the settling position for a long time.In order to obtain the high position precision of contact jaw, require to constitute the propping up of settling position that limits the detection pin and honour, and require to adopt in the few simple structure of assembling parts time error accumulative total with the ball that can realize high manufacturing accuracy and cylinder.But, in contact detector in the past, on a structure of honouring of the settling position that limits contact jaw, have problems.

Summary of the invention

Problem of the present invention is to provide a kind of contact detector, its limit contact jaw settling position honour simple in structure, can carry out high-precision processing and assembling, and the position of contact jaw can not change along with use and temperature variation repeatedly.

The present invention relates to a kind of contact detector, this contact detector possesses: housing 6; Be located at the support unit 4 on this housing adjustable position; Detect pin 1, the contact jaw 11 of its front end is outstanding from the opening 9 of described housing; And the base portion that will detect pin is by the spring 12 that is pressed on the described support unit, the predetermined settling position of described detection pin is honoured and limited by being formed between its base portion and the described support unit three, honours for these three to be following three and to honour: the parts of support unit side honour 35 with any first of contacting of parts of the base portion side of detection pin; Honour 36 for second of 2 contacts of above-mentioned parts; And the 3rd of 3 contacts of above-mentioned parts honours 37.

The contact detector of the application's first invention is characterised in that, three supporting centerings at the contact detector of said structure, honour by the round bar 30 of radiation direction and be that the round bar 23 of tangential direction of the circle at center forms for described first to detect pin, honour by the round bar 31 of radiation direction and to be positioned at two of this round bar both sides be that one group spheroid 24 forms for described second, described the 3rd honour by spherical surface body 25 or circular conical surface body 33 and on the periphery of the bottom surface of cylinder hole opposed, dispose with it, three be that one group spheroid 32 forms.

In addition, the contact detector of the application's second invention is characterised in that, in three parts of honouring of the contact detector that constitutes said structure, 30,31 and three of the round bars of described radiation direction are that one group spheroid 32 is fixed on the base portion that detects pin, and the round bar of described tangential direction 23, two are that one group spheroid 24 and spherical surface body 25 or circular conical surface body 33 are located on the support unit 4.

Support unit 4 by three stretching screws 17 and three supporting screw 18 adjustable positions be fixed on the inboard of housing 6, three stretching screws 17 can connect the through hole of the bottom 16 of being located at housing with rotating freely, and be screwed in the threaded hole of the bottom surface of being located at support unit 4, three supporting screws 18 pass the threaded hole that connects this bottom, and front end is connected on the bottom surface of support unit 4.

The structure of contact detector of the present invention is so simple structure: the parts that influence the positional precision of contact jaw are the ball and the cylinder that can carry out high-precision processing, and also less because of assembling and the bonding deviation accumulation that produces, so can provide cheap and high-precision contact detector.In addition,, have such effect according to second invention: utilize to run through to be arranged at no matter be the groove of support unit or the base portion that detects pin or the hole can be located exactly and fixingly form three cylinder and the spheroids of honouring, and cheap for manufacturing cost.

Description of drawings

Fig. 1 is the longitudinal diagram of one embodiment of the present of invention.

Fig. 2 is the stereographic map of the major part of the embodiment in the presentation graphs 1.

Fig. 3 launches to represent first, second and the 3rd synoptic diagram of honouring with section.

Fig. 4 is that expression is by cone and three sectional views that prop up the example of honouring that spheroid constitutes.

Fig. 5 is the stereographic map of an example of the contact detector of expression existing structure.

Label declaration

1: detect pin; 4: support unit; 6: housing; 9: the opening of housing bottom; 11: contact jaw; 12: compression spring; 23: round bar; 24: two is one group spheroid; 25: spherical surface body; 30: round bar; 31: round bar; 32: three is one group spheroid; 33: the circular conical surface body; Honour for 35: the first; Honour for 36: the second; 37: the three honour.

Embodiment

Below, with reference to accompanying drawing embodiments of the present invention are described.On the top of the housing 6 of illustrated contact detector, be provided with integratedly and be used for this contact detector is installed to handle 7 on the throw axle (axle of the instrument of rotations such as drill bit or milling cutter is installed) of lathe.Partly accommodate the support unit 4 of ring-type at the interior side-lower of housing 6.Be that the opening 9 that the detection pin 1 of contact jaw 11 passes the center pit 8 of support unit 4 and is located at housing bottom extends to the below of housing 6 with the front end.

Between the base portion 2 of top board 10 that is formed at housing 6 volume inside and detection pin 1, compression spring 12 is installed.On the base portion that detects pin 1, formed flange 20.The diameter of this flange 20 is greater than the diameter of the center pit 8 of support unit 4, thereby flange 20 can not be by the center pit 8 of support unit 4.Therefore, the base portion 2 that detects pin by the power of spring 12 by being pressed on the support unit 4.

Housing 6 possesses the bottom 16 with center pit 9 in its bottom, and the center pit 9 that detection pin 1 passes this bottom extends to outside the housing 6.The support unit 4 of short cylinder shape is fixed on the inboard of housing 6 by three stretching screws 17 and three supporting screws 18, three stretching screws 17 can connect bottom 16 with rotating freely, and be screwed in the threaded hole of the lower surface of being located at support unit 4, three supporting screws 18 screw in the threaded hole that connects bottom 16, and front end is connected on the lower surface of support unit 4.

As shown in Figure 2, each three stretching screw 17 and supporting screw 18 are on the circumference at center with the interval alternate configurations of 60 degree in the axle center with housing.During some in being screwed into stretching screw 17, this part of support unit 4 is by drop-down, during some in being screwed into supporting screw 18, this part of support unit 4 by on push away.For the contact detector that assembles,, set the correct position of contact jaw 11 by suitably being screwed into described three stretching screws and three supporting screws.

Opposed on the lower surface (with the opposed face of the upper surface of support unit) of the flange 20 that detects the pin base portion, on the vertex position of equilateral triangle that with the axle center of detecting pin 1 is the center, be formed with recess (for example V groove) 21,22 and bottom outlet 26 is arranged, in recess 21,22, be embedded with the

round bar

30,31 of two radiation directions, three are that one group spheroid 32 is embedded in this and has in the bottom outlet under the state that is pressed on the side face that bottom outlet 26 is arranged, and fix by electric resistance welding respectively.

On the other hand, on the upper surface of support unit 4, round bar 23, two are that 30,31 and three of two round bars that one group spheroid 24 and spherical surface body 25 were located at and detected the pin base portion respectively are on one group the spheroid 32 opposed positions.Be fixed in support unit 4 by electric resistance welding under the state of the round bar 23 of support unit side in being embedded in the V groove 27 of tangential direction of circle that axle center with support unit 4 is the center, two be one group spheroid 24 to be embedded in elongated, cross section in the tangential direction along described circle be to be fixed on the support unit 4 by electric resistance welding under the state in the oval-shaped shallow bore hole 28, be fixed on the support unit 4 by electric resistance welding under the state of spherical surface body 25 in being embedded in circular hole 29.

Limit three supporting centerings of the settling position of contact jaw 11, honour 35 round bars 23 for first and form by round bar 30 that detects the pin side and support unit side.Second is honoured 36 is that one group spheroid 24 forms by another round bar 31 that detects the pin side and support unit side two.In addition, the 3rd to honour 37 be that one group the spheroid 32 and the spherical surface body 25 of support unit side form by detecting three of pin side.By the pressing force of

spring

12,30,23 1 contacts of first two round bar honouring, second is honoured 36 round bar 31 is that one group 24 two of spheroids contact with two, the 3rd three of honouring are that one group spheroid 32 contacts with 25 3 of spherical surface body.By utilizing these six contact point supportings to detect the base portion of pin 1, the settling position of contact jaw 11 in three dimensions is defined.

In the above-described embodiment, the 3rd is honoured 37 is that spheroid 32 and a spherical surface body 25 of one group forms by three, still, and also can be as shown in Figure 4, an above-mentioned spherical surface body 25 is formed by a circular conical surface body 33, and the axial of this circular conical surface body 33 is same direction with detecting the axial of pin 1.In addition, the spherical surface body among the figure be diameter respectively greater than the diameter sphere of three spheroids 32 opposed with it, but also can be hemisphere.

Claims

1. contact detector, this contact detector has: housing (6); Support unit (4), its adjustable positions are located on this housing wholely; Detect pin (1), the contact jaw of its front end (11) is outstanding from the opening (9) of described housing; And spring (12), its base portion that will detect pin is by being pressed on the described support unit, the predetermined settling position of described detection pin is honoured and is limited by being formed between its base portion and the described support unit three, honour for these three and be following three and honour: the parts that detect the base portion side of pin are honoured (35) with any first of contacting of parts of support unit side, honour (36) for second of 2 contacts of described parts; And the 3rd of 3 contacts of described parts honour (37), wherein,

Described first honour by the round bar (30) of the first radiation direction with relative with it be that the round bar (23) of tangential direction of the circle at center forms to detect pin, described second to honour by the round bar (31) of the second radiation direction and relative with it two of being positioned at these round bar both sides be that one group spheroid (24) forms, described the 3rd honour by on the bottom surface periphery that is disposed at bottom outlet (26), three be that one group spheroid (32) forms with spherical surface body (25) or the circular conical surface body (33) relative with it.

2. contact detector according to claim 1 is characterized in that,

The round bar (30,31) of described first, second radiation direction and three spheroids (32) that are a group are fixed on the base portion of detection pin, and the round bar of described tangential direction (23), two are that one group spheroid (24) and spherical surface body (25) or circular conical surface body (33) are located on the support unit (4).