JPH0210883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic outer diameter measuring machine that automatically measures the outer diameter of an object to be measured, such as a round shaft material, and more particularly, to an automatic outer diameter measuring machine that automatically measures the outer diameter of an object to be measured, such as a round shaft material. The present invention relates to an automatic outer diameter measuring machine that simultaneously and automatically measures the diameters of each step of a stepped round shaft material.

Generally, the measurement of the outer diameter of each step of a stepped round shaft material is
When it is difficult to place the object to be measured in the proper posture on the measuring machine, and depending on the shape of the stepped round shaft material, it is difficult to measure the outer diameter of each step with one type of measuring machine. In many cases, the measurement efficiency was extremely low, and sufficient measurement accuracy could not be obtained. Therefore, there is a need for a measuring machine that can quickly and accurately measure the outer diameter of each step of a stepped round shaft material or the like. The conventional outer diameter measuring machine that should meet this requirement is
It has been proposed that a large number of electric micrometers are arranged to correspond to each stage of a stepped round shaft. However, in such conventional devices, a stepped round shaft member is provided between a movable contact connected to the core of the operating transformer and a fixed contact provided opposite to the movable contact. Since the method attempts to measure the outer diameter dimensions of each stage by forcibly inserting it, measurement errors are likely to occur, and it is extremely difficult to automate by incorporating a device for supplying and discharging objects to be measured. When inserting an object to be measured between the contacts or taking it out from between the contacts, the contacts are likely to be damaged.

The object of the present invention is to be able to quickly, reliably, and accurately measure the outer diameter of each step of a stepped round shaft material, etc., and also to provide automatic outer diameter measurement that is easy to automate by incorporating a feeding and discharging device. We are here to provide you with a machine.

The present invention provides a rotating shaft that is rotatably supported on a bearing stand, a rotating means for rotating the rotating shaft, and a rotating shaft that is capable of holding an object to be measured and adjusting the position along the longitudinal direction of the rotating shaft. A measuring object holding stand and a measuring object fixing means for fixing the measuring object to the measuring object holding stand are provided, and a plurality of outer diameter measuring heads are arranged along the longitudinal direction of the rotating shaft to measure these outer diameters. A head is made to correspond to each stage of the object to be measured, and each outer diameter measuring head is provided with a
A pair of contacts arranged opposite to each other so as to be separated from each other and close to each other along the same straight line direction perpendicular to the rotation axis, a drive mechanism for separating and approaching the pair of contacts, and a drive mechanism between the pair of contacts. a detector for detecting a distance, the drive mechanism is connected to the rotation shaft, and the distance between each pair of contactors is moved apart or approached by the rotation of the rotation shaft, thereby achieving the purpose. This is what we are trying to achieve.

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 according to the present invention. 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 a rotating shaft is provided between these bearing stands 20 and 30 along the horizontal direction. A moving shaft 40 is rotatably arranged, and an outer diameter measuring head 50 is disposed between the bearing stands 20 and 30.
are arranged along the longitudinal direction of the rotation shaft 40.

The first bearing pedestal 20 is formed in a box shape that is fixed to the right end of the base 10 in the figure via a fixing plate 21, and is arranged parallel and perpendicular to each other as shown in FIG. It has bearing plates 22 and 23. One end side of the rotating shaft 40 is rotatably supported on these bearing plates 22 and 23 via bearings 24 and 25, and after passing through the bearing plate 23, the rotating shaft 40 is moved for a predetermined length as shown in FIG. It is protruded to the right.

The center of a circular plate 31 is fixed to the right end of the rotating shaft 40 that protrudes from the bearing plate 23 (see FIG. 4), and a predetermined position other than the center of this circular plate 31 is fixed.
That is, the connecting shaft 32 is attached parallel to the rotation shaft 40 at a position separated by a predetermined length along the radial direction of the rotation shaft 40 . The upper end of a connecting rod 33 is rotatably connected to the connecting shaft 32, and the lower end of the connecting rod 33 is rotatably connected to a connector 34. Connector 34 connects to bracket 35
is fixed to the upper end of a piston 37 of a cylinder device 36 which is fixed to the bearing plate 23 along the vertical direction through the vertical movement of the piston 37, in other words, in a direction substantially perpendicular to the longitudinal direction of the rotating shaft 40. The rotation shaft 40 is configured to be rotated forward and backward along the forward and backward movement. Note that the rotation shaft 40 is formed by the connecting shaft 32 and the cylinder device 36.
A rotating means 60 for rotating is configured.

At a predetermined position on the outer peripheral edge of the circular plate 31, a fourth
As shown in the figure, a V-shaped locking groove 41 is formed, and in this locking groove 41, there are grooves located near the outer periphery of the circular plate 31 at predetermined intervals along the circumferential direction of the circular plate 31. The contact piece 4 of each of the two micro switches 42 and 43 fixed to the bearing plate 23 as shown in FIG.
2A and 43A can be inserted, and the circular plate 3
1, that is, the rotation angle (inverted position) of the rotation shaft 40 can be detected by the microswitches 42 and 43. Further, the electric signals detected by the micro switches 42 and 43 are connected to the drive source of the cylinder device 36 to control the rotation and reversal of the rotation shaft 40.

Furthermore, two guide rollers 45 are attached to the bearing plate 23 via mounting blocks 44 to guide the piston 37 from both sides in FIG. A box-shaped cover 47, which accommodates the rotating means 60 therein, is attached via a mounting rod 46 so that the rotating means 60 is accommodated therein. 3rd part of cover 47
On the right side wall in the figure, there are two
Two mounting blocks 51 (see FIG. 4) are fixed. Each of the mounting blocks 51 is provided with pin-shaped stoppers 52 facing each other, and the distance between the tips of the stoppers 52 is adjustable.
The mounting block 51 also includes a buffer member 53.
are provided facing each other (see Fig. 3). The buffer member 53 includes an abutment pin 54 whose distal ends face each other with a predetermined interval apart, a holder 55 that holds the abutment pin 54 slidably in the vertical direction in the figure, and a holder. A spring 56 is provided within the body 55 and biases the abutting pins 54 in a direction to abut each other. On the other hand, an abutment plate 57 is fixed to the connecting portion between the piston 37 and the connector 34, and the abutment plate 57 can abut on each of the stopper 52 and the buffer member 53. This restricts the stroke of the piston 37, and the contact plate 57 contacts the buffer member 53 before contacting the stopper 52, thereby preventing a collision between the contact plate 57 and the stopper 52. It is designed to be avoided.

Further, a first block stand 61 is fixed to the right end of the base 10 in FIGS. 1 and 2 adjacent to the back side of the first bearing stand 20 in FIG. At the left end of the stand 10 is a second block stand 62.
is located.

The second block stand 62 is placed on a movable stand 64 guided by a rail member 63 laid on the base 10 along the longitudinal direction of the rotation shaft 40. The block stand 62 is movable on the base 10 along the longitudinal direction of the rotating shaft 40, and can be fixed at a predetermined position with a fixing bolt 64A. Further, a stem 30 is attached to the side surface of the second block stand 62 on the near side in FIG.
The second bearing stand 30 is fixed via A, and the rotation shaft 40 is fixed by this second bearing stand 30.
One end side is rotatably supported. moreover,
When the second block stand 62 moves to the left in FIGS. 1 and 2 by a predetermined amount or more, the rotation shaft 40 can be removed from the second bearing stand 30.

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 to have a V-shaped holding groove 72 in the center of a substantially rod-shaped member having a U-shaped cross section (the sixth (see figure), this measurement object holding table 71 is fixed to an elevating member 73 via a fixing screw. The elevating member 73 includes a guide member 74 attached to the opposing side surfaces of each of the first and second block stands 61 and 62 along the vertical direction.
They are slidably fitted in a dovetail groove via a spacer A (see FIG. 7), and the frictional force during fitting can be adjusted using an adjustment bolt 75.

Further, 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 is connected to the first and second block stands 61 and 62, respectively.
It extends to the top side. The first of the lifting plates 76;
A vertical position adjusting screw 77 is screwed into a predetermined position on the upper end surface side of the second block stands 61, 62 downward from the upper end side in the figure. The tip is engaged with each of the block stands 61 and 62 in a rotatable but immovable manner, and is engaged with the knob 7 of the vertical position adjustment screw 77.
When 7A is gripped and rotated, the elevating member 73 and the object holding table 71 can be moved vertically up and down.

On both left and right sides of the lifting plate 76 in FIG. 6, two pillars 81 and 82 are arranged parallel to each other and erected vertically upward. These pillars 81 and 82
The upper ends of the cylinders are connected to each other by a connecting plate 83, and a cylinder device 84 is attached to the center of the connecting plate 83. A piston rod 85 of the cylinder device 84 extends toward the lower end of the connecting plate 83 in the figure, and a slider 86 is fixed to the tip of the piston rod 85. The slider 86 is slidably engaged with the column 82, and two support plates 91 are fixed to the slider 86 and are arranged parallel to each other so as to protrude toward the front in FIG. A swing plate 93 is swingably attached between the plates 91 via a support shaft 92 . Further, a pin 94 is spanned between the support plates 91 at a predetermined position on the rear side of the support shaft 92 in FIG. 8 and on the upper end surface side of the swing plate 93.
When the swing plate 93 is in contact with the swing plate 93, the swing plate 93 is maintained substantially horizontally.

The tip side of the swing plate 93 is connected to the object holding table 71.
A pressing rod 101 serving as a measuring object fixing means is located at the tip of the swing plate 93 toward the lower side in the figure, that is, toward the measuring object holding table 71 side. It is installed protrudingly. Further, the extension line of the central axis of this pressing rod 101 is the sixth,
As shown in FIG. 8, it is arranged to coincide with the center portion of the holding groove 72 of the measurement object holding table 71. The pressing rod 101 is slidably inserted into the rocking plate 93 but cannot fall, and a spring receiver 102 is provided at the tip, and between the spring receiver 102 and the rocking plate 93 there is a A compression coil spring 103 is interposed to surround the pressure rod 101, and the compression coil spring 103 biases the pressure rod 101 downward.

Further, the lower end of a tension coil spring 105 is attached to the rear side of the swing plate 93 in FIG.
It is fixed at 06. Spring mounting rod 106
The base end is fixed to the slider 86, and the distal end side is bent so as to be placed at a predetermined position vertically above the mounting position of the swing plate 93 of the tension coil spring 105. 8th of 93
The rear end in the figure is biased upward in the figure.

Further, an abutment pin 108 is attached to the connecting plate 83 via a substantially L-shaped attachment plate 107. The tip of the contact pin 108 is connected to the mounting plate 107.
The slider 86 is mounted facing downward in the figure, and its tip is brought into contact with the upper surface of the rocking plate 93 when the slider 86 is moved upward by a predetermined amount in the figure. The abutting position between the abutting pin 108 and the rocking plate 93 is on the rear side of the support shaft 92 in FIG. When it comes into contact with the plate 93, the tip of the rocking plate 93 is rotated upward, and as a result, the press rod 101 springs upward, and the tip of the press rod 101 and the object holding table 71 are rotated upward. The distance between them has been widened considerably.

A mounting block 111 is attached to the support column 81 so that its mounting position can be adjusted, and two micro switches 112 and 113 are attached in the vertical direction to the front side of this mounting block 111 in FIG. Support plate 9 of the slider 86
A contact block 115 having a substantially trapezoidal cross section is fixed to the outside of the mounting block 111 of the slider 1, and when the slider 86 is moved up and down by the cylinder device 84 and positioned at a predetermined position, the micro switches 112, 133 contact pieces 112A, 113A
and the abutment block 115 are in contact with each other, so that the vertical stroke of the slider 86 can be detected.

As shown in FIG. 9, the plural outer diameter measuring heads 50 arranged between the first and second block stands 61 and 62 are made of a relatively thin metal plate and are opened upward in the figure. Gate-shaped frame 121
have.

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 the slide 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, and the frame stand 123, in other words, 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 bored in the frame 121 and the frame base 123, respectively, and a tension coil spring 133 is interposed between these mounting pins 131 and 132, and is fixed to the movable contact 142 by this tension coil spring 133. A first biasing member that urges the frame 121 in the direction in which the contactor 141 approaches.
A biasing means is configured.

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. Further, the protruding portion 151A is fitted into the right end portion of the frame 121 in the figure, and thereby the casing 15
1 is fixedly supported on a 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.
4 is provided with an index scale 155 made of glass or the like on which similar scales are formed, facing each other, and a light emitting element 156 and a light receiving element 157 are mounted on the bracket 1 with both scales 154 and 155 sandwiched between them.
58. Here, the scales 154 and 155, the light emitting element 156, and the light receiving element 157 constitute a detector 160, and this detector 160 allows the movable contact 142 to
and the casing 151, that is, the moving contact 142
and the frame 121, or in other words, the relative position (interval) between the movable contact 142 and the fixed contact 141 is detected.

On the other hand, one end of the guide shaft 153 is slidably guided by a guide member 161, and a compression coil spring 16 as a second biasing means is provided between the guide member 161 and the mounting plate 152.
2 is interposed so as to surround the guide shaft 153, and the movable contact 142 is biased toward the fixed contact 141 with respect to the casing 151, in other words, the frame 121, by this compression coil spring 162.

A rail body 172 is fixed to the right end side of the casing 151 in FIG. 9 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 changing reel 174 is slidably supported in this guide groove 173 (see FIG. 10). The central axis 1
75 is biased toward the right side in FIG. 9 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 wound around the direction change reel 174, and this drive rope 1
One end of the drive rope 81 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 is configured to have a relatively weak spring force, and although the tension spring 177 prevents the drive rope 181 from loosening, it does not move against the spring force of the compression coil spring 162. Moving the child 142 or rotating the rotating body 183
It is designed so that it does not rotate.

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. 11). 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 12 in FIG.
It is possible to contact 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, and when the rotating body 183 is rotated, Accordingly, the frame 121 can be moved in 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 153, that is, the movable contact 142 is moved along the axial direction via the drive rope 181. Note that here, the spring 1
33, 162, rotating body 183, drive rope 18
1 and the direction change reel 174 constitute a drive mechanism 210.

Next, the operation of this embodiment will be explained.

The second block stand 62 is slid on the base 10 along the rail member 63 to the left side in FIG. Each rotating body 183 of the diameter measuring head 50
The frame base 123 is inserted through the rotating shaft 40.
is supported by the rail member 63. The number of outer diameter measuring heads 50 placed corresponds to the number of stages of objects to be measured, and the mounting positions correspond to the positions of each step of objects to be measured.

The second block stand 6 is moved to the left side in FIG. 1 in order to place the plurality of outer diameter measuring heads 50 thereon.
2 to the right side, that is, in the direction approaching the first block stand 61, and after the left end side of the rotation shaft 40 is rotatably inserted and held in the second bearing stand 30, it is fixed by the fixing bolt 64A. It is fixed onto the base 10 via the rail member 63. The fixing position of the second block stand 62 is adjusted so that the two workpiece holding stands 71 hold both ends of the workpiece.

In this way, after holding the two workpiece holding tables 71 at appropriate intervals and fixing the plurality of outer diameter measuring heads 50 at positions corresponding to each stage of the workpiece, the piston rod of the cylinder device 84 is 85 to raise the slider 86 along the column 82, bring the contact pin 108 into contact with the upper surface of the swing plate 93, and flip up the tip side of the pressing rod 101.
The distance between the tip end of the pressing rod 101 and the object holding table 71 is widened.

Next, the holding position of the fixed contact 141 in the frame 121 is once separated from the movable contact 142, and the rotating shaft 40 is moved to the ninth position by the rotating means 60 driven by the cylinder device 36.
The take-up reel 185 is rotated counterclockwise in the figure.
The movable contact 142 is then moved to the right side in the figure by the drive rope 181. 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 measurement is performed using the vertical position adjustment screw 77 provided on each measurement object holder 71. The object holding tables 71 are vertically adjusted separately and independently from each other so that the central axes of the reference bodies are precisely parallel to the axial direction of the rotation shaft 40, and the central axes of the reference bodies are in contact with each other. Fixed contact element 14 constituting the child
1 and the axis of the moving contact 142.

After holding the reference body in this manner, the piston rod 85 of the cylinder device 84 is lowered, and the reference body is held at both ends between the tip of the pressing rod 101 and the object holding table 71, respectively. At this time, both ends of the reference body are each compressed by a coil spring 1.
The reference body is held against the holding groove 72 side with a predetermined pressing force by the biasing force 03, and the reference body is fixed on the measuring object holding table 71.

Since the reference body is held and fixed in a proper position by the above operation, next, the fixed contact 141 of each outer diameter measuring head 50 is attached to the frame 1.
21, and each fixed contact 141 is fixed to the frame 121 in a state in which it is brought into contact with each stage of the reference body from the left side in FIG. 9, and the rotating shaft 40 is Rotate clockwise to bring the movable contact 142 into contact with each stage of the reference body from the right side. As a result, both contacts 141, 142
Each stage of the reference body is held between them,
In this state, the frame 121 is detected by the detector 160.
Detecting the relative position of the moving contact 142 with respect to
The information is stored in a storage device (not shown) or the like.

After measuring the outer diameter of each stage of the reference body in this manner, the rotating shaft 40 is again rotated counterclockwise in FIG. 6 to move the movable contact 142 to the right side in the figure. At this time, the frame 1 of the fixed contact 141
21 is not moved at all, but as the cam 184 pushes the frame 121 to the left in the figure, 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 piston rod 85 of the cylinder device 84 is raised,
The slider 86, that is, the pressing rod 101, is raised to release the pressing state of both ends of the reference body toward the object holding table 71, and the piston rod 85 is further raised to release the pressing rod 101.
The reference body is removed from the measuring object holding table 71 with the tip side thereof springing up, and both ends of the measuring object are held and fixed on the measuring object holding table 71.

After holding and fixing the object to be measured, measure the outer diameter of each step of the object in the same manner as when measuring the reference body, and measure the outer diameter of the moving contact 142 relative to the frame 121 obtained by the detector 160. By comparing the relative position with the relative position obtained when measuring the reference body, the dimensions of each step in the object to be measured can be obtained. When displaying measurement results, deviations from a reference body may be displayed, or absolute values may be displayed.

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. 9 together with the frame 121, and there will be 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. In addition, the measurement results may be displayed by displaying only the deviation from the reference body, or by displaying the absolute dimensions 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, the fixed contact 141 is not only moved a predetermined distance to the left in FIG. Even if an object to be measured whose diameter is considerably larger than the 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 object to be measured are easily moved. This has the effect of effectively avoiding a collision.

In addition, since the two workpiece holding stands 71 that hold both ends of the workpiece can be adjusted independently from each other, even if the workpiece has different outer diameters at both ends. The object to be measured can be easily held in a state in which the central axis of the object to be measured is precisely parallel to the central axis of the rotating shaft 40.

Furthermore, the object to be measured held by the object to be measured 71 is held by the pressing rod 101 driven by the cylinder device 84 with a predetermined pressing force on the object to be measured holder 71 side, so that the object to be measured is held by the object to be measured during measurement. This also has the effect that the outer diameter dimension can be measured with high precision.

Furthermore, since the rotation means 60 that drives the rotation shaft 40 in forward and reverse rotation has the cylinder device 36, there is no influence of inertia during reversal, unlike when using a motor or the like, for example. The reversal can be done quickly and smoothly, so that the contact 141
The separating and approaching movements of 142 and 142 also have the effect of being operated extremely quickly and appropriately.

In the implementation, it was assumed that the workpiece holding tables 71 were arranged at both ends of the rotation shaft 40 and could be adjusted up and down independently of each other, but only one workpiece holding stand 71 was able to be adjusted up and down. Alternatively, the positions of the two workpiece holding stands 71 may be adjusted at the same time. however,
If the workpiece holding bases 71 can be independently adjusted in their vertical positions as in the embodiment described above, it is easy to place the workpiece at an appropriate position regardless of the outer diameter of any stepped round shaft material. There is an effect that there is.

Further, although the object to be measured held on the object holding table 71 is held by the pressing rod 101 as the object fixing means, the object fixing means may be a device such as a robot having a gripping part. good.

Further, one end side of the rotation shaft 40 is connected to a second bearing stand 3.
0, but it may be supported in a non-detachable manner. However, if the rotating shaft 40 is removable from the second bearing stand 30, the required number of measuring heads 50 are placed on the base 10 so that each measurement head 50 is inserted from one end of the rotating shaft 40. It is easy to match the shape of the object to be measured. Further, the second block stand 62 is connected to the base 10.
In other words, the distance between the measuring object holding stands 71 can be adjusted, and each outer diameter measuring head 50
The mounting position between the measurement object holding stands 71 is also adjustable; however, these measurement object holding stands 7
1 and the mounting position of each outer diameter measuring head 50 may be non-adjustable. However, if these can be adjusted, there is an effect that the outer diameter dimension of stepped round shaft members of any shape can be easily automatically measured.

Further, the rotating body 183 of the drive mechanism 210 is connected to the cam 1.
84 and a take-up reel 185; however, the present invention is not limited to this, and may be made of, for example, only a cam or a take-up reel on which a drive rope whose direction is changed by an appropriate direction change reel is wound. In short, any rotational movement of the rotating body may be converted into linear movement in the axial direction of the contacts 141, 142. Further, as the rotating body 183 rotates in the counterclockwise direction in FIG. 9, the frame 121
Although it is assumed that the frame 121 is pushed by the cam 184 and moved slightly to the left side in the figure, it is not necessary to move the frame 121 to the left side, and it is not necessary to move the frame 121 at least to the right side. It is enough to prevent it from being moved.

Furthermore, although the frame 121 is arranged on the frame stand 123 via the parallel springs 122, for example, the contactor 14 is placed on the frame 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 springs 122 are used, the overall structure can be extremely simplified, 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, the outer diameter of each step of a stepped round shaft material, etc. can be measured quickly, reliably, and with high precision, and it is also possible to automate the measurement by incorporating a measuring object supply and discharge device. It is also possible to provide an automatic outer diameter measuring machine that is easy to use.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are a front view and a plan view, respectively, showing the overall configuration of an automatic outer diameter measuring machine according to the present invention;
FIG. 3 is a sectional view showing the first bearing pedestal of the embodiment, FIG. 4 is a sectional view taken along the line - in FIG. 3, and FIG. 5 is a front view showing the second bearing pedestal of the embodiment. 6 is a side view showing the second block stand of the embodiment, FIG. 7 is a sectional view taken along the - line in FIG. 5, and FIG. 8 is an enlarged perspective view showing the second block stand. 9 is a side view showing the structure of the measuring head of the above embodiment, FIG. 10 is an enlarged cross-sectional view taken along the line - in FIG. 9, and FIG. 11 is a cross-sectional view taken along the line - in FIG. 9. It is a diagram. 10... Base, 20, 30... Bearing stand, 31...
... Circular plate, 32 ... Connection shaft, 36 ... Cylinder device, 37 ... Piston rod, 40 ... Rotation shaft,
50... Outer diameter measuring head, 60... Rotating means, 6
1, 62...Block stand, 71...Measurement object holding stand, 72...Holding groove, 73...Elevating member, 76...
... Lifting plate, 77 ... Vertical position adjustment screw, 81, 8
2... Support column, 84... Cylinder device, 93... Rocking plate, 101... Pressing rod as measuring object fixing means, 108... Contact pin, 121... Frame, 122... Parallel spring, 123... ... Frame stand, 133 ... Tension coil spring as first biasing means, 141, 142 ... Fixed contactor as a pair of contacts, movable contactor, 151 ... Casing, 160 ... Detector, 162 ... Compression coil spring as second biasing means, 173 ... Guide groove, 174 ... Direction changing roll, 175 ... Central shaft, 181 ... Drive rope, 183 ... Rotating body,
184...cam, 185...take-up reel, 21
0... Drive mechanism.

Claims (1)

[Claims] 1. A rotating shaft rotatably supported on a bearing stand, a rotating means for rotating the rotating shaft, and a rotating means for holding and positioning an object to be measured along the longitudinal direction of the rotating shaft. The measuring object has an adjustable measuring object holding stand, measuring object fixing means for fixing the measuring object to the measuring object holding stand, and a plurality of outer diameter measuring heads arranged along the longitudinal direction of the rotating shaft, Each outer diameter measuring head includes a pair of contacts arranged facing each other so as to be spaced apart from each other and close to each other along the same straight line perpendicular to the rotation axis, and a drive mechanism that moves the pair of contacts apart and close to each other. and a detector for detecting the distance between the pair of contacts, and
The automatic outer diameter measuring machine characterized in that the drive mechanism is connected to a rotation shaft so that the distance between each pair of contactors increases or decreases by rotation of the rotation shaft. 2. In claim 1, the rotating means includes a connecting shaft that is connected to the rotating shaft at a position separated by a predetermined length along the radial direction of the rotating shaft, and a distal end side that is connected to the connecting shaft. and a cylinder device having a piston that moves back and forth along a direction substantially perpendicular to the longitudinal direction of a rotating shaft. 3 In claim 1 or 2,
An automatic outer diameter measuring machine characterized in that said object holding stands are arranged at both ends of a rotating shaft, and their positions can be adjusted independently of each other. 4. In any one of claims 1 to 3, the measurement object fixing means is capable of moving forward and backward toward the measurement object held on the measurement object holding stand, and is capable of applying a constant pressing force to the measurement object. An automatic outer diameter measuring machine characterized by a contacting pressing rod. 5. In any one of claims 1 to 4, the drive mechanism for the outer diameter measuring head has a rotating body externally fitted and fixed to the rotating shaft, and the rotational movement of the rotating body is An automatic outer diameter measuring machine characterized in that the pair of contacts are moved apart and approached by conversion into linear motion. 6. The automatic outer diameter measuring machine according to claim 5, wherein the rotating body is removably attached to the rotating shaft.