JPH048323Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a contact-type measuring instrument such as a dial gauge, and more particularly to a contact-type measuring instrument that can increase its measuring force.

[Background Art] A contact type measuring device such as a dial gauge or a digital display type displacement measuring device has a spindle attached to its main body so as to be displaceable in the axial direction, and the spindle is brought into contact with the tip of the spindle by a spring built into the main body. It is configured to measure the dimensions of the object to be measured based on the amount of displacement of the contact (the amount of displacement of the spindle) when the object to be measured (workpiece) is brought into contact with the contact. Contact type measuring instruments configured in this way are used in a wide range of fields.

This type of measuring device is designed so that the contact comes into contact with the object to be measured with a predetermined measuring pressure, and this measuring pressure is generally considered to be weak, about 150gf, for measurement accuracy reasons. There is.

Incidentally, conventionally, it has been necessary to maintain this measurement pressure constant in order to maintain high measurement accuracy, and various measures have been taken in this regard. Therefore, if the workpiece itself has a certain amount of reaction force, there have been cases where the contact type measuring device cannot be used.

For example, in FIG. 1, a piston material 2 is housed in a cylinder 1 and is urged upward in the figure by a compression coil spring 3, and is fixed to a surface plate 5 by a stand 4 from the upper end surface of the piston material 2. The dial gauge 6 is shown in a state in which the contacts 7 of the dial gauge 6 are in contact with each other. In such a case, while the pressure measured by the dial gauge 6 is weak as described above, the biasing force of the compression coil spring 3 is enormous, so the lowest lower limit position is defined by a stopper member (not shown). It was not possible to measure the height of the lowermost position of the piston material 2.

In addition, in FIG. 2, an L-shaped link member 8 is prepared, and the contactor 7 is attached to one end of the link member 8, and the biasing force is increased by a compression coil spring 9 at the other end. An example is shown in which the other end side is brought into contact with the workpiece 10 in this state. In this way, there were cases in which it was necessary to prepare an auxiliary biasing force (spring 9) to apparently cancel out the reaction force from the workpiece 10 (including the frictional resistance force of each part).

[Purpose of the invention] The purpose of the invention is to develop a contact-type measurement system that can increase the measuring force and thereby perform measurement work as specified even in the presence of reaction forces (including frictional resistance forces of various parts) on the side of the object to be measured. It is about providing the equipment.

[Structure of the invention] The present invention has a spindle mounted on a main body so as to be displaceable in its axial direction, and the spindle is biased in the protruding direction of a contact at the tip of the spindle by a spring built into the main body, so that the contact can be measured. In a contact type measuring instrument that measures the dimensions of a measurement target from the amount of displacement of a contact when the target is brought into contact, the spring is a first spring, and a second spring is arranged on the axis of the spindle. is provided, one end of the second spring is locked to the spindle side, and the other end is locked to the main body side.

In the above, the spring force can be adjusted by making the second spring replaceable with one with a different spring constant, or by expanding and contracting the second spring in the axial direction of the spindle using a rotatably operated nut, screw, etc. .

[Description of Embodiments] Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 3 shows a first embodiment of the contact type measuring instrument according to the present invention, in which a spindle 32 is mounted on a main body 31 via a stem 33 so as to be displaceable along the axial direction of the spindle 32. . A contact 34 formed with a larger diameter than the spindle 33 is coaxially and removably screwed onto the tip of the spindle 32 and fixed thereto. A biasing force is applied so that the contactor 34 is biased to move in a protruding direction along the axis.

Further, a second spring 36 is interposed between the contact 34 at the tip of the spindle 32 and the stem 33, with the spindle 32 loosely inserted therein. spindle 3
It is located on the axis of 2. At this time, stem 3
A counterbore 37 is formed in the lower edge of the spring 3 to a predetermined depth, and the second spring 3 is inserted into the counterbore 37.
6 is in a state where one end side is inserted and held.
The second spring 36 installed in this manner can be selected and installed so that it can be replaced with another second spring 36 having a different spring constant by removing the contact 34 from the tip of the spindle 32. This creates a biasing force that biases the spindle 32 toward the contact 34 when the contact 34 is brought into contact with a measuring object (not shown), in other words, the first spring 35 and the second spring 35 The total biasing force of the spring 36, or in other words, the measurement pressure of the contactor 34 against the measurement object is configured to be adjustable from the outside of the main body 31.

Further, the amount of displacement of the spindle 32 is enlarged and transmitted to a pointer 38 via an enlargement mechanism (not shown), and the pointer 38 points a dial 39 to display the dimensions of the object to be measured.

Next, how to use this embodiment will be explained.

By appropriately selecting the spring constant of the second spring 36 and interposing it between the stem 33 and the contact 34, the measuring pressure of the contact 34 (spindle 32) is adjusted, in this case increased. After selecting the second spring 36 according to the measurement purpose, for example, the fourth spring 36 is selected.
Tighten the stem 33 with the screw 41 as shown.
Attach it to the stand 42 so that the contact 34 comes into contact with one end side of the L-shaped link 43, etc.
The other end of the link 43 is arranged so that it can come into contact with a workpiece (object to be measured) 44. This results in
Even when the reaction force from the workpiece 44 is larger than the urging force of the first spring 35 on the spindle 32, the urging force of the second spring 36 is added to the urging force of the first spring 35, so that the reaction force is Nevertheless, the spindle 32 becomes movable in the direction in which the contactor 34 protrudes, and desired dimensions and the like can be measured using the pointer 38 and the dial 39. Note that the measurement direction is not limited to being changed by the link 43, and the workpiece 44 may be brought into direct contact with the contactor 34.

This embodiment has the following effects.

By adding the biasing force of the second spring 36 to the biasing force of the spindle 32 by the first spring 35, the contactor 3
Since the measurement pressure in step 4 is increased, even if there is a reaction force (including frictional resistance force of each part) from the measurement object (workpiece 44) side, the desired measurement can be performed without using any special auxiliary means. can be measured.

Furthermore, the contactor 34 is
Remove the second spring constant with various spring constants.
Since the spring 36 can be appropriately selected and employed, various measurement pressures can be easily obtained depending on the reaction force. Therefore, there is no need to prepare a large number of measuring instruments for various measurement pressures, and the economical burden is small, which is extremely convenient.

Moreover, when replacing the second spring 36, the main body 3
There is no need to disassemble the main body 31, and this can be easily done from the outside of the main body 31, which is extremely efficient and desirable in terms of dustproof effect.

Further, according to this embodiment, since the second spring 36 is provided on the axis of the spindle 32, the spring force of the second spring 36 does not act on the spindle 32 as a rotational moment. Therefore, smooth movement of the spindle 32 can be ensured, and uneven wear of the spindle 32 and stem 33 can be prevented.

Next, embodiments other than those described above will be described, and the same reference numerals will be used for parts that are the same as or similar to those of the embodiments described above, and the explanation will be omitted or simplified.

A second embodiment is shown in FIG. In this second embodiment, a male threaded portion 51 in the axial direction of the spindle 32 is formed on the proximal end side of the contactor 34, and when the contactor 34 is screwed and fixed to the distal end side of the spindle 32, this male threaded portion 51 is It is in an exposed state, and the spring receiving nut 52 is screwed into it. A second spring 36 is interposed between the spring receiving nut 52 and the stem 33 on the axis of the spindle 32, and the screwing position of the spring receiving nut 52 with respect to the male threaded portion 51 is adjusted to the main body 3.
By adjusting from the outside of the spring 1, the biasing force of the second spring 36 can be adjusted without replacing the second spring 36. In addition, the spring receiving nut 52
is provided with a set screw 53, and this set screw 53
This allows the spring receiving nut 52 to be firmly fixed to the male threaded portion 51.

According to the second embodiment, in addition to producing the same effects as the first embodiment, the second spring 36 can be easily adjusted by adjusting the spring receiving nut 52 without replacing the second spring 36. The spring force and therefore the measuring pressure of the contact 34 can be adjusted, which has the effect of being more convenient.

A third embodiment is shown in FIG. In this third embodiment, the base end of the spindle 32 is connected to the main body 3.
A cap 6 is attached to the cap 1 so as to be freely displaceable in the axial direction.
1 , a second spring 62 is provided directly above the spindle 32 , in other words, the second spring 62 is provided on the axis of the spindle 32 . One end of the cap 61 is opened, and a spring force adjustment screw 63 is screwed into this opening in the axial direction of the spindle 32, and the knob 63A of the spring force adjustment screw 63 is inserted into the main body 3.
Rotate the spring force adjustment screw 6 from the outside of 1.
3 and the spindle 32, the spring force of the second spring 62 can be adjusted.

According to such an embodiment, unlike the first and second embodiments, the second spring 62 is not exposed to the outside, which is preferable in terms of dust prevention effect, and the measurement pressure of the contact 34 can be measured without removing the contact 34 from the spindle 32. can be easily adjusted, and furthermore, the measurement pressure can be adjusted without replacing the second spring 62.

In addition, in implementation, although the counterbore 37 in the first and second embodiments is not necessarily necessary, the counterbore 3
7 has the effect that the effective stroke of the spindle 32 does not have to be narrowed. Further, the display mechanism for displaying the amount of movement displacement of the spindle 32 is not limited to the pointer type with the pointer 38 and dial 39, but various types of displacement detectors such as a photoelectric type and a magnetic type are built into the main body 31. , the structure may be such that dimensions and the like can be displayed using a digital display mechanism.

[Effects of the invention] As described above, according to the invention, since the second spring is provided in addition to the first spring, the measuring force can be increased.
As a result, even if there is a reaction force (including frictional resistance of each part) on the side to be measured, the measurement work can be carried out as specified. In particular, since the second spring is arranged on the axis of the spindle, smooth movement of the spindle can be ensured, and uneven wear of the spindle and the like can be prevented.

[Brief explanation of the drawing]

1 and 2 are front views showing different usage examples of conventional contact-type measuring instruments, respectively, and FIG. 3 is a front view showing the overall configuration of a first embodiment of the contact-type measuring instrument according to the present invention. 4 is a front view showing an example of the use of the first embodiment, and FIGS. 5 and 6 are respectively
and FIG. 7 is an enlarged partially cutaway front view showing essential parts of the third embodiment. 31...Main body, 32...Spindle, 33...
stem, 34... contact, 35... first spring,
36, 62...Second spring, 51...Male thread part,
52... Spring receiving nut, 63... Spring force adjustment screw.

Claims (1)

[Claims for Utility Model Registration] (1) A spindle is mounted on the main body so as to be displaceable in its axial direction, and the spindle is biased in the direction in which the contact at the tip of the spindle projects by a spring built into the main body, and the contact In a contact type measuring instrument that measures the dimensions of a measurement object based on the amount of displacement of a contact when the measurement object is brought into contact with the A contact type measuring instrument characterized in that a spring is provided, one end of the second spring is locked to the spindle side, and the other end is locked to the main body side. (2) Utility model registration In the contact type measuring device according to claim 1, the second spring is provided on the contactor detachably attached to the tip of the spindle and the main body, The spindle is interposed between a stem movably inserted therein, and the second
A contact type measuring instrument characterized in that the spring can be freely replaced with another spring having a different spring constant. (3) Utility model registration In the contact type measuring instrument according to claim 1, the contactor attached to the tip of the spindle is formed with a male threaded portion in the axial direction of the spindle, and the second The spring is interposed between a spring receiving nut screwed onto the male threaded portion and a stem provided in the main body and into which the spindle is movably inserted, and is rotated by rotation of the spring receiving nut. A contact type measuring instrument, characterized in that the spring force of the second spring is adjusted. (4) Utility model registration In the contact type measuring instrument according to claim 1, the main body is provided with a cap into which the base end of the spindle is movably inserted, and the end of the cap has a A spring force adjustment screw is screwed in the axial direction of the spindle, and the second spring is interposed between the base end of the spindle and the spring force adjustment screw inside the cap, and the second spring is inserted between the base end of the spindle and the spring force adjustment screw. A contact type measuring instrument, characterized in that the spring force of the second spring is adjusted by rotating a force adjustment screw.