JPH0210882B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an outer diameter measuring head, and more particularly to an outer diameter measuring head that measures the outer diameter of an object by holding the object between a pair of contacts.

In the case of an outer diameter measuring head that clamps the object to be measured between a pair of contacts, the contacts are movably placed on a rail, and the contacts are moved back and forth by a piston that moves back and forth along the axial direction of the contacts. A conceivable method is to bring the contacts into contact with the object from both sides. However, such an outer diameter measuring head has the disadvantage that the mechanism for driving the contactor becomes complicated and the entire device tends to be large. When measuring the outer diameter of multiple locations of an object at the same time, it becomes extremely difficult to arrange an outer diameter measuring head for each measuring location, and it is difficult to arrange multiple outer diameter measuring heads. In this case, there is also the disadvantage that drive sources must be provided separately to drive the contacts for each outer diameter measuring head.

SUMMARY OF THE INVENTION An object of the present invention is to provide an outer diameter measuring head that has a simple structure, is easy to downsize, and is also capable of moving a plurality of contacts using a common drive source.

The present invention includes a fixed contact and a movable contact that are arranged opposite to each other on the same axis, the movable contact being movably supported along the axial direction, and the fixed contact being fixedly held. and a frame movably attached to the frame stand along the axial direction; a detector for detecting the distance between the movable contact and the fixed contact from the amount of displacement of the movable contact with respect to the frame; a first urging means for urging the frame from the moving contact side to the fixed contact side along the direction; and a second urging means for urging the moving contact towards the fixed contact side. , a moving means for separating the movable contact and the fixed contact against the first and second biasing means; further, a rotating body is provided in the moving means, and rotation of the rotating body is provided. If the movement is converted into a linear movement in the axial direction, and each of the rotating bodies of the plurality of outer diameter measuring heads is mounted on a common rotation axis,
The above object is achieved by simultaneously separating and approaching the fixed contact and the movable contact of each measuring head by means of the common rotation axis.

Embodiments of the present invention will be described below based on the drawings.

1 and 2 show the overall structure of an embodiment of an automatic outer diameter measuring machine to which an outer diameter measuring head according to the present invention is applied. In these figures, first and second bearing stands 20 and 30 are provided at both ends of a horizontally placed rectangular cylindrical base 10, respectively, and these bearing stands 2
A rotation shaft 40 is rotatably arranged between the bearing stands 20 and 30 along the horizontal direction, and the bearing stands 20 and 30
A plurality of outer diameter measuring heads 50 according to the present invention are arranged between them along the longitudinal direction of the rotating shaft 40.

The first bearing stand 20 is formed in a box shape fixed to the right end of the base 10 in the figure via a fixing plate 21, and is rotatable along one end of the rotation shaft 40 along the horizontal direction. A driving source (not shown) such as a cylinder device or a motor is disposed inside the first bearing stand 20.
The rotation shaft 40 is configured to be able to rotate in forward and reverse directions by this drive source.

A first block stand 61 is fixed on the base 10 adjacent to the back side of the first bearing stand 20 in FIG. A block stand 62 is arranged. The second block stand 62 includes a rail member 6 laid on the base 10 along the longitudinal direction of the rotation shaft 40.
The second block table 62 is placed on a movable table 64 that is slidably guided through a bearing (not shown) on the base 10. It is movable along the longitudinal direction and can be fixed at a predetermined position with a fixing bolt 64A. Further, the second block stand 62
The second bearing pedestal 30 is fixed to the front side in FIG. has been done. Furthermore, the rotation shaft 40 is attached to the second bearing pedestal 30 and can be removed from the second bearing pedestal 30 when the second block pedestal 62 moves more than a predetermined amount to the left in FIGS. It's becoming like that.

A measuring object holding stand 71 is attached to the first and second block stands 61 and 62, respectively. To explain these two measuring object holding stands 71 together, the measuring object holding stand 71 is formed of a substantially horizontally placed rod-like member with a U-shaped cross section, and has a V-shaped holding groove 72 in the center. (See Figure 4). This measurement object holding table 71 is fixed to an elevating member 73 via a fixing screw. The elevating member 73 is slidably fitted in a dovetail groove via a spacer 74A to a guide member 74 attached vertically to the opposing side surfaces of each of the first and second block stands 61 and 62. (see FIG. 5), and the frictional force during fitting can be adjusted using an adjustment bolt 75.

An elevating plate 76 is fixed to the upper end surface of the elevating member 73, and one end side of this elevating plate 76 extends to the upper surface side of the first and second block stands 61 and 62, respectively. A vertical position adjustment screw 77 is screwed downward from the upper end side in the figure into a predetermined position located on the upper end surface side of the first and second block stands 61 and 62 of the elevating plate 76. The tip of this vertical position adjustment screw 77 is connected to the block table 61,
62 in a rotatable but immovable manner, and the knobs 7 of these vertical position adjustment screws 77
If you hold 7A and rotate it, the two elevating plates 76,
In other words, the elevating member 73, or in other words, the two measuring object holding stands 71 are configured such that the mounting positions of each are adjusted separately and independently of each other. Further, a measurement object (not shown) such as a stepped round shaft material whose both ends are held on the measurement object holding table 71 is fixed on the measurement object holding table 71 by a measurement object fixing means (not shown). It is becoming more and more like this.

A plurality of the outer diameter measuring heads 50 arranged between the first and second block stands 61 and 62 have a frame 121, which is made of relatively thin metal as shown in FIG. It is made of a plate and is formed into a gate shape with an opening on the upper side in the figure.

A fixed contact 14 is located at the left end of the frame 121 in the figure.
1 is fixedly held so that its holding position can be adjusted, while a movable contact 142 is mounted on the right end of the frame 121.
is supported so as to be movable along the axial direction. The fixed contact 141 and the movable contact 142 have their axial directions aligned with each other, that is, they are disposed facing each other on the same straight line. A pair of contacts are configured to be held together.

The frame 121 has shape retaining plates 126 on both sides.
is placed on a frame base 123 via a parallel spring 122 attached thereto, and is movable within a predetermined range in the horizontal direction in the figure, that is, along the axial direction of the contacts 141 and 142. . The frame stand 123 is attached to a sliding groove 125 formed in the rail member 63 along a direction parallel to the longitudinal direction of the rotation shaft 40 via T bolts 124, that is, the frame stand 123, in other words Thus, the frame 121 is attached so that its position can be adjusted along the longitudinal direction of the rotating shaft 40.

Mounting pins 131 and 132 are provided protruding from the frame 121 and frame base 123, and a tension coil spring 133 is interposed between these mounting pins 131 and 132.
3, the contactor 14 moves along the axial direction.
A first biasing means is configured to bias the frame 121 in a direction from the second side toward the fixed contact 141 side.

A casing 151 is provided on the right end side of the frame 121 in FIG. A small circular tubular protrusion 151A is formed at the left end of the casing 151, and the movable contact 142 is slidably supported within this protrusion 151A. Furthermore, this protrusion 151A is fitted into the right end of the frame 121 in the figure, so that the casing 151
is fixedly supported by the frame 121. One end side of the movable contact 142 extends into the casing 151, and a guide shaft 153 and a main scale 154 are fixed in the casing 151 via a mounting plate 152 along a direction parallel to the axis of the movable contact 142, respectively. has been done. The main scale 154 is made of glass or the like having graduations on the μm order.
An index scale 155 made of glass or the like is provided opposite to the main scale 154 in the vicinity of the main scale 154, and the light emitting element 1 is placed between the scales 154 and 155.
56, a light receiving element 157 is provided via a bracket 158. Here, a detector 160 is configured by the scales 154, 155, the light emitting element 156, and the light receiving element 157, and the detector 160 detects the movable contact 142 and the casing 151, that is, the movable contact 142 and the frame 121, In other words, the relative position (interval) between the moving contact 142 and the fixed contact 141 can be detected.

On the other hand, one end of the guide shaft 153 is slidably guided by a guide member 161, and a movable contact 142 is urged toward the fixed contact 141 between the guide member 161 and the mounting plate 152. A compression coil spring 162 as a second biasing means is interposed so as to surround the guide shaft 153, and this compression coil spring 162 causes the movable contact 142 to be biased against the casing 151, in other words, against the frame 121. It is biased toward the fixed contact 141 side.

A rail body 172 is fixed to the right end side of the casing 151 in FIG. 6 via a fixture 171. The rail body 172 has the movable contact 142
A long guide groove 1 along a direction parallel to the axial direction of the
A central shaft 175 of a direction change reel 174 is slidably supported in this guide groove 173 (see FIG. 7). The central axis 17
5 is biased toward the right side in FIG. 6 along the guide groove 173 by a tension spring 177 attached to the casing 151 via a tension spring attachment rod 176. A drive rope 181 is wrapped around the direction change roll 174.
One end of the drive rope 181 is fixed to the guide shaft 153, and the other end of the drive rope 181 is fixed to the rotating body 183. Note that the tension spring 177 has a relatively weak spring force, and although the tension spring 177 prevents the drive rope 181 from loosening, the movable contact 142 resists the spring force of the compression coil spring 162. The rotating body 183 is not moved or the rotating body 183 is rotated.

The rotating body 183 is formed into a substantially thin pincushion shape, with an eccentric cam 184 at the outer periphery and a perfectly circular take-up reel 185 at the center recess (see FIG. 8). This rotating body 183 is removably attached to the rotating shaft 40 via an attachment ring 186, and this attachment ring 186 is fixed to the frame base 123 via a support 187. The cam 184 is attached to the frame 121 in FIG.
It can come into contact with a roller-shaped contact body 192 attached to the frame 121 via a substantially L-shaped attachment block 191 attached to the right end of the frame 121.
When the rotating body 183 is rotated, the frame 121 can be moved along the horizontal direction.

Further, one end side of the drive rope 181 is wound around the take-up reel 185 via a fitting 193, and the rotating shaft 40
When the rotating body 183 is rotated, the guide shaft 183, that is, the movable contact 142 is moved along the axial direction via the drive rope 181.

Here, the rotation body 183, the direction change reel 174, and the drive rope 181 cause the springs 133 and 16 to act as first and second biasing means.
A moving means 190 is configured to separate the contacts 141 and 142 from each other.

Next, the operation when measuring the outer diameter of a stepped round shaft material as a measurement object according to this embodiment will be explained.

By sliding the second block stand 62 along the rail member 63, the distance between the two workpiece holding stands 71 is adjusted to correspond to the length of the workpiece, and
Each of the plurality of outer diameter measuring heads 50 is slid along the rail member 63 so as to correspond to the position of each step of the object to be measured, and the second block table 62 and each of the outer diameter measuring heads 50 are moved to the base 10. Fix it on top.

Next, the holding position of the fixed contact 141 on the frame 121 is temporarily separated from the movable contact 142, and the rotation shaft 40 is rotated counterclockwise in FIG. and the movable contact 1 by the drive rope 181.
42 to the right side in the figure. As a result, the distance between the tips of the fixed contact 141 and the movable contact 142 forming the pair of contacts is widened.

In the state where the contactors 141 and 142 are expanded, a reference body serving as a reference for measurement is held on both measurement object holders 71, and the vertical position adjustment screw 77 provided on each measurement object holder 71 A reference body serving as a reference for measurement is held on each measurement object holding table 71, and further fixed on the holding table 71 by the measurement object fixing means. At this time, the measurement object holding table 71
are vertically adjusted separately and independently from each other so that the center axis of the reference body is exactly parallel to the axial direction of the rotation shaft 40, and the center axis of the reference body constitutes a pair of contacts. It is made perpendicular to the axes of the fixed contact 141 and the movable contact 142.

Next, the fixed contact 14 of each outer diameter measuring head 50
1 relative to the frame 121 to fix each fixed contact 141 to the frame 121 in a state in which each of the fixed contacts 141 is brought into contact with each step of the reference body from the left side in FIG. is rotated clockwise in the figure to bring the movable contact 142 into contact with each stage of the reference body from the right side. As a result, both contacts 1
41 and 142, and in this state, the detector 160 detects the relative position of the movable contact 142 with respect to the frame 121, and stores it in a storage device (not shown) or the like. I'll keep it.

After measuring the outer diameter of each stage of the reference body in this way, the rotating shaft 40 is again rotated counterclockwise in FIG. 6 to move the movable contact 142 to the right in the figure. At this time, the frame 12 of the fixed contact 141
Although the holding position relative to 1 is not moved at all, the cam 184 pushes the frame 121 to the left in the figure, so the fixed contact 141 is moved slightly to the left, and therefore both contacts 141 and 142 are aligned with the reference. It will separate you from each stage of your body. In this state, the object to be measured is held and fixed on the holding table 71 in place of the reference object, and the outer diameter of each step of the object is measured in the same manner as when measuring the reference object. By comparing the thus obtained relative position of the movable contact 142 with respect to the frame 121 with the relative position obtained when measuring the reference body, the dimensions of each step in the object to be measured can be obtained.

Note that when trying to hold a measurement object having an outer diameter larger than the reference body on the holding table 71, the fixed contact 141 may come into contact with the measurement object; The attached frame 121 is fixed to the frame base 1 by the parallel spring 122.
23, the fixed contact 141 can be easily moved to the left side in FIG. 6 together with the frame 121, and there is no problem in holding the object to be measured on the holding table 71. Further, as the frame 121 moves in the lateral direction, the frame 121 moves up and down with respect to the object holding table 71, but this up and down movement is within a range that can be ignored in terms of measurement accuracy. Further, the measurement result may be displayed only as a deviation from the reference body, or may be displayed as an absolute dimension based on the dimensions of the reference body.

This embodiment has the following effects.

The fixed contact 141 and the movable contact 142 constituting a pair of contacts are not guided so as to be freely displaceable in the axial direction by a rail member or the like and moved forward and backward by a piston or the like. While being fixedly held on the frame 121 mounted via a spring 122,
Since the movable contact 142 is movably supported by the frame 121 and is configured to be moved by the rotation of the rotating body 183, the overall number of parts is small and downsizing is easy. In particular, it can be constructed very thinly. Therefore, even when measuring a stepped round shaft material with a large number of stages, a large number of outer diameter measuring heads 5 are required for each stage.
0, which has the effect of widening the range of objects that can be measured. moreover,
Even when a large number of outer diameter measuring heads 50 are arranged and used, the contacts 1 of all the outer diameter measuring heads 50 are operated by one drive source via a common rotation shaft 40.
41 and 142 can be operated simultaneously, the structure does not become complicated even when a large number of outer diameter measuring heads 50 are arranged and used, and it is easy to handle and measurements can be carried out quickly.

Further, a contactor 141 constituting a pair of contacts,
142, the fixed contact 141 is fixed to the frame 121 in advance at a position corresponding to the outer diameter of the object to be measured, while the movable contact 142 is connected to the rotation of the rotating body 183. Since it is moved by the holder, it is not only easy to incorporate a device for supplying and discharging the object to be measured, but also there is no risk of damage to the tip of the contact when inserting the object to be measured. Moreover, not only is the fixed contact 141 moved a predetermined distance to the left in FIG. Even if an object to be measured whose diameter is considerably larger than the above dimensions is to be placed between the two contacts 141 and 142, the fixed contact 141 is easily moved to the left side in the figure, and the fixed contact 141 and the measuring object are easily moved to the left side in the figure. This has the effect of effectively avoiding collisions with objects.

In addition, in the implementation, the moving means 190 is made up of a rotating body 183, a direction change reel 174, and a drive rope 181, and the rotating body 183 is made up of a cam 184 and a take-up reel 185, but the present invention is not limited to this, for example. It may consist only of a cam, or only a take-up reel around which a driving rope whose direction is changed by an appropriate direction change reel is wound.
Any material that can be converted into a linear motion in the axial direction of 1,142 degrees is sufficient. Further, as the rotating body 183 rotates counterclockwise in FIG. 6, the frame 121 is pushed by the cam 184 and is moved slightly to the left in the figure; Frame 12 to the side
It is not necessary to move the frame 121, and it is sufficient to prevent the frame 121 from being moved at least to the right side.

Furthermore, although the frame 121 is arranged on the frame stand 123 via the parallel spring 122, for example, the contactor 14 is placed on the frame stand 123.
The frame 121 may be slidably mounted on the frame stand 123 via a rail member, a guide groove, etc. provided along the moving direction of the frame 1,142. However, if the parallel spring 122 is used, the overall structure can be made extremely simple, and in particular, it can be made thinner.

Further, the fixed contact 141 may be held by the frame 121 in such a way that the holding position thereof cannot be adjusted. However, if the holding position can be adjusted, each fixed contact 141 of each outer diameter measuring head 50 can be fixed at a position corresponding to each step of the object to be measured, which is extremely convenient because the measurement range is widened.

As described above, according to the present invention, it is possible to provide an outer diameter measuring head that has a simple structure, is easy to downsize, and is also capable of moving a plurality of contacts using a common drive source.

[Brief explanation of drawings]

1 and 2 are a front view and a plan view, respectively, showing the overall configuration of an automatic outer diameter measuring machine according to an embodiment to which an outer diameter measuring head according to the present invention is applied, and FIGS. 3 and 4 are 5 is a sectional view taken along the line - in FIG. 3, FIG. 6 is an enlarged view showing the overall configuration of the outer diameter measuring head, and FIG. 7 is a side view showing the main parts of the embodiment. 6 is an enlarged cross-sectional view taken along the line - in FIG. 6, and FIG. 8 is a cross-sectional view taken along the line - in FIG. 6. 10... Base, 20, 30... Bearing stand, 40...
...Rotation axis, 50...Outer diameter measuring head, 61, 62
...Block stand, 71...Measurement object holding stand, 72...
...Retaining groove, 73... Elevating member, 76... Elevating plate,
77... Vertical position adjustment screw, 121... Frame, 122... Parallel spring, 123... Frame stand, 133... Tension coil spring as first biasing means, 141... Fixed contact, 142... Moving contact, 151... Casing, 160... Detector, 162... Compression coil spring as second biasing means, 173... Guide groove, 174... Direction changing reel, 175... Central shaft, 181 ... Drive rope, 183 ... Rotating body, 184 ... Cam, 18
5... Winding reel, 190... Transportation means.

Claims (1)

[Scope of Claims] 1. A fixed contact and a movable contact arranged opposite to each other on the same axis, the movable contact being movably supported along the axial direction, and the fixed contact being fixed. a frame mounted on a frame base so as to be held at the same time and movable along the axial direction; a detector that detects the distance between the movable contact and the fixed contact from the amount of displacement of the movable contact with respect to the frame; a first biasing means that biases the frame from the movable contact side toward the fixed contact side along the axial direction; and a second biasing unit that biases the movable contact toward the fixed contact side. and these first,
a moving means for separating the movable contact and the fixed contact against the second biasing means, the moving means having a rotating body, and the rotating movement of the rotating body is directed in the axial direction. An outer diameter measuring head, characterized in that the outer diameter measuring head is configured to be converted into a linear motion. 2. The outer diameter measuring head according to claim 1, wherein the fixed contact is held by a frame so that its holding position can be adjusted. 3 In claim 1 or 2,
The rotating body of the moving means is composed of a cam and a take-up reel that are arranged coaxially with each other, and the cam can come into contact with the frame, while one end of the drive rope is fixed to the take-up reel, and the drive rope is fixed to the take-up reel. An outer diameter measuring head characterized in that the other end of the drive rope is fixed to a moving contact via a direction changing reel.