JPS6335366Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a displacement measuring device, and is particularly suitable for use in limit gauges, linear gauges, dial gauges, etc., and has a measuring head slidably supported on a main frame. The present invention relates to an improvement in a displacement measuring device that measures the length of an object to be measured based on the amount of displacement of the probe when the tip of the probe is brought into contact with the object.

It has a measuring head that is slidably supported on the main frame, and from the amount of displacement of the measuring head when the tip of the measuring head comes into contact with the object to be measured, it is determined that the dimensions of the object to be measured are within the allowable range, such as tolerance. There are limit gauges that detect whether or not the object is within the range, or electric linear gauges or mechanical dial gauges that measure the length of the object from the amount of displacement of the measuring point. It is being

Such displacement measuring devices have a function that allows the probe to be quickly retracted within a predetermined range in order to repeatedly measure objects of the same size, and a reference measuring device in case the object to be measured changes. In other words, there is a demand for a function that allows the measurement range to be changed significantly. However, until now, there has been no displacement measuring device that fully satisfies both of these functions, and therefore, for example, when making measurements, first the probe is brought into contact with a reference body placed on a reference surface such as a surface plate. It was necessary to determine a reference value or to set an upper limit or lower limit by moving a predetermined amount from the reference value. Therefore, for each object to be measured, it is necessary to prepare a reference body that is processed with high precision so that the deviation from the reference value is zero, and such a reference body cannot be processed in the same processing process as the object to be measured. , it was an extremely heavy financial burden. In addition, it is difficult to set the measuring tip exactly to the reference value or set value, and the work efficiency is poor. For example, when the display is a digital display and only the release is used as the measuring tip driving means, In particular, it was difficult to match the display of the least significant digit to the reference value or set value, and in some cases, setting was impossible.

The present invention was made to eliminate the above-mentioned conventional drawbacks, and allows the measuring point to be accurately and quickly set and adjusted to any reference position while making effective use of the full stroke of the measuring point. It is an object of the present invention to provide a displacement measuring device that can quickly and easily perform repeated measurements at any set reference position.

The present invention has a gauge head that is slidably supported on a main frame, and the length of the target object can be determined from the amount of displacement of the gauge head when the tip of the gauge head comes into contact with the target object. A displacement measuring device configured to measure a winding roller rotatably supported by the main frame;
A rotary knob that can be locked to the main frame at any rotational position, a pulley that is rotatably supported by the main frame, and a wire that interlocks the hoisting roller and the measuring head via the pulley. The above-mentioned object is achieved by including a release which, when activated, pulls the wire in the winding direction to retract the probe by a predetermined amount.

Further, when the release is activated, the wire is pulled in the winding direction by moving the pulley.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, this embodiment has a measuring element 12 that is slidably supported on a main frame 10, and when the tip 12a of the measuring element 12 is brought into contact with the object to be measured. A digital display type linear gauge that electrically measures the length of the object to be measured based on the displacement amount of 12 and displays it digitally, the winding roller 14 being rotatably supported by the main frame 10; A rotation knob 16 that can be locked to the side surface of the main frame 10 at any rotation position for rotating the winding roller 14, and a fulcrum 1
a substantially L-shaped pulley support member 20 rotatably supported by the main frame 10 about 8;
A pulley 22 is rotatably supported at one end of the pulley support member 20, and, via the pulley 22, the winding roller 14 and the upper ends of the gauge head 12 are attached to the lower side of the subframe 24. The wire 28 connecting the arranged sub-frame moving members 26 and the tip of the wire tube 30a are fixed to the side surface of the main frame 10, and the tip actuating part 30b is engaged with the other end of the pulley support member 20 to operate. At times, the wire 2 is rotated clockwise to move the pulley 22 upward in the figure.
8 in the winding direction, and a release 30 for retracting the probe 12 by a predetermined amount.

In the figure, 31 is a case cover, 32 is
A rod 34 whose lower end is fixed to the main frame 10 and which slides and guides the subframe 24 and the subframe moving member 26 and prevents the subframe 24 from rotating is attached to the upper end of the rod 32 and the subframe 24. Measuring head 1 interposed between
A compression spring 35 for applying measurement pressure to 2 is
The lower end of the bushing 36 is connected to the subframe 24.
A main scale 38, which is formed of alternating light-transmitting parts and non-light-transmitting parts, is fixed to the measuring head 1.
A light source (not shown) is used to detect the amount of vertical displacement of the probe 12 from the displacement of the main scale 36 due to the movement of the main scale 2, and a light transmitting portion and a non-transmitting portion similar to the main scale 36 are formed alternately. This is a photoelectric displacement detection device that includes an index scale formed by the main scale 36 and a light receiving element that receives light transmitted through the main scale 36 and the index scale. The output of this photoelectric displacement detection device 38 is input to a digital display section (not shown), and
The amount of displacement from the reference position of No. 2 is digitally displayed.

The rotation knob 16 has a main frame 10
A ratchet pawl 40 that can engage with a recess 10a formed on the side surface of the winding roller 14, and a shaft 42 of the winding roller 14.
a spring receiver 44 fixed to the tip of the spring receiver 44;
A compression spring 46 inserted between the inner wall of the rotary knob 16 and a detent member 48 that allows the rotary knob 16 to be displaced in the axial direction with respect to the shaft 42 are provided. When released, the rotation knob 16 is biased to the left in the figure by the action of the compression spring 46, and the ratchet pawl 40 moves into the recess 10.
a, and the rotating knob 16 can be locked to the main frame 10 at any rotational position.

The action will be explained below.

first. When measuring a new object to be measured, or
When the dimensions of the object to be measured are changed, the rotation knob 16 is pulled out to the right in the figure against the compression spring 46 to disengage the recess 10a of the main frame 10 and the ratchet pawl 40. state, turn knob 1
Rotate 6. Then, the winding roller 14 rotates, and the wire 28 is wound up or rewound.
The subframe moving member 26 moves in the vertical direction in the figure, and in conjunction with this, the subframe 24 and the probe 12 are moved at high speed in the vertical direction in the figure. When it is confirmed by the digital display etc. that the probe 12 has reached the reference position, by releasing the rotation knob 16 and fixing the winding roller 14, the point is set as the reference position. Become. Therefore, the probe 12 can be accurately and quickly set and adjusted to any reference position without using a reference body.

At this time, rotate the rotation knob 16 and the main frame 1.
By attaching a scale to the side of the gauge head, the current position of the gauge head 12 relative to its effective stroke can be confirmed, and the reference position of the gauge head 12 can be set.
Adjustments can also be made more quickly and reliably.

On the other hand, the measuring tip 12 set and adjusted to the reference position
When repeatedly measuring objects of the same size using the , the tip actuating portion 30b is projected to the left in the figure by operating the release 30 after the measurement is completed. Then, the pulley support member 20 moves to the fulcrum 18
The pulley 22 is pulled upward in the figure, the subframe moving member 26 is also pulled upward in the figure, and the contact point 12 is moved by a predetermined amount in the figure. be pushed back upwards. Therefore, when repeatedly measuring objects of the same size, by operating only the release 30, which has a shorter stroke than the measuring stylus 12, at any reference position, unnecessary movement of the measuring stylus 12 can be avoided. In addition, the dimensions of the object to be measured can be quickly and repeatedly measured while preventing the accompanying excessive movement speed.

In this embodiment, the wire 28 is moved by moving the pulley 22 via the pulley support member 20.
Since the wire 28 is pulled in the winding direction, the pulling operation of the wire 28 is performed extremely smoothly. Moreover, by appropriately setting the lever ratio of the pulley support member 20, the operating force of the release 30 or , the maximum lifting amount of the probe 12 in repeated measurements can be easily adjusted. Note that the method of pulling the wire 28 in the winding direction by the release is not limited to the above embodiment.
The wire 28 can be pulled in the winding direction by directly actuating the tip actuating section 30b of the release 30 on the shaft of the pulley 22, or the tip actuating section 30b of the release 30 can be actuated via a wire biasing member. Of course, by engaging the wire 28, it is also possible to pull the wire 28 in the winding direction during the release operation.

Furthermore, in this embodiment, the sub-frame 24 to which the upper end of the measuring element 12 is fixed is pulled upward in the figure via the sub-frame moving member 26, so the wire 28 controls the movement of the measuring element 12. There will be no hindrance. Note that it is also possible to directly connect one end of the wire 28 to the subframe 24.

Furthermore, in this embodiment, the amount of displacement of the gauge head 12 is measured by the main scale 3 directly connected to the gauge head 12.
Since the amount of displacement of wire 2 is detected by reading it with the photoelectric displacement detection device 38,
8 has no effect on measurement accuracy.

In the above embodiments, the present invention was applied to an electric linear gauge equipped with a digital display, but the scope of application of the present invention is not limited to this, and is applicable to an electric linear gauge equipped with a digital display. It is also applicable to limit gauges, mechanical dial gauges, etc. When the present invention is applied to an electric limit gauge equipped with a digital display section, together with the digital display function, the reference position can be adjusted without using a reference body.

As explained above, according to the present invention, the gauge head can be accurately and quickly set and adjusted to any reference position while making effective use of the entire stroke of the gauge head. Repeated measurements at the reference position can be performed quickly and easily. In addition, during repeated measurements, by operating the release, the probe can be lifted by the required amount from an arbitrary reference position, which prevents wasteful movement of the probe and the resulting excessive movement speed. It has excellent effects such as shortening the falling distance of the probe.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the configuration of an embodiment of a displacement measuring device according to the present invention. 10... Main frame, 12... Measuring head, 1
4... Winding roller, 16... Rotating knob, 20...
...Pulley support member, 22...Pulley, 24...Subframe, 26...Subframe moving member, 28...
...Wire, 30...Release, 32...Rot.

Claims (1)

[Claims for Utility Model Registration] (1) It has a gauge head that is slidably supported on a main frame, and from the amount of displacement of the gauge head when the tip of the gauge head comes into contact with the object to be measured, A displacement measuring device configured to measure the length of an object to be measured, etc., includes a winding roller rotatably supported by the main frame, and an arbitrary rotation position for rotating the winding roller. a rotary knob that can be locked to the main frame, a pulley that is rotatably supported on the main frame, and a wire that interlocks the winding roller and the measuring head via the pulley; A displacement measuring device comprising: a release that retracts the probe by a predetermined amount by pulling a wire in a winding direction. (2) The displacement measuring device according to claim 1, wherein the release moves the pulley to pull the wire in the winding direction when activated.