JPS5815841Y2 - Dial gauge - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a diamond gauge that indicates measurement dimensions in two different units of length.

Generally used dial gauges indicate the measured quantity in one length unit on the scale plate, so if you want to convert the unit of wear to the unit of length, for example, you must use a conversion table or the like. The calculation required a great deal of effort.

The present invention solves the above-mentioned problems by using two pointers on the scale plate to indicate the measured quantity in two different units of length, and a path for transmitting the movement of the spindle to the two pointers. A means for preventing backlash is provided inside.

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

In FIG. 1, a spindle 1 having consecutive racks 1' and 1'' is supported by a dial gauge frame 2 so as to be movable in a straight line, and the spindle 1 is biased in one direction by a spring 3.

A first pinion 6 to be engaged with the rack 1' is fixed to a first shaft 5 supported between the dial gauge frame 2 and the main plate 4, and a first intermediate gear 7 is fixed to the first shaft 5. At the same time, the back gear 8 is rotatably supported on the first shaft 5, and the first shaft 5 is rotated. As shown in FIG. 2, a preloaded spring 9 is interposed between the first intermediate gear 7 and the back gear 8.

On the other hand, a second shaft 10 supported between the dial gauge frame 2 and the base plate 4 is engaged with the rack 1''.
A pinion 11 is fixed, a second intermediate gear 12 is fixed to the second shaft 10, and a back gear 8' is rotatably supported by the second shaft 10. As shown in FIG. 2, a preloaded spring 9' is interposed between the second intermediate gear 12 and the back gear β'.

Then, a first driving gear 16 with a first pointer 15 attached thereto is rotatably supported on an intermediate shaft 14 supported between the dial gauge frame 2 and the main plate 13, and the first driving gear 16 is moved to the first intermediate shaft 14. A second driving gear 18 is meshed with the gear 7 and a second pointer 17 is attached to the intermediate shaft 14, and the second driving gear 18 is meshed with the second intermediate gear 12.

The back gear 8 is meshed with the second drive gear 18, and the back gear 8' is meshed with the first drive gear 16, respectively.

19 is a scale plate, and the periphery of this scale plate 19 has a third
A scale 19a as shown in the figure is provided in the circumferential direction.

This scale plate 19 is attached to the dial gauge frame 2 side, and the shaft portion of the first drive gear 16 passes through the center of this scale plate 19.

Further, 20 is a short hand attached to the second shaft 10.

When the measuring head 21 attached to the tip of the spindle 1 is moved along the measuring surface of the object to be measured, the spindle 1 is vertically displaced with respect to the measuring surface, and the amount of displacement of the spindle 1 is , is converted into the amount of rotation of the second pinion 11.

This amount of rotation is transmitted to the first drive gear 16 and second drive gear 18 by the first intermediate gear 7 and second intermediate gear 12, respectively, and the displacement amount of the spindle 1 is indicated on the scale by the first pointer 15 and second pointer 17, respectively. instructions on board 19.

In the figure, reference numeral 3 denotes a spring that biases the spindle 1 toward the probe 21 side.

On the other hand, with respect to the movement of the spindle 1, the first intermediate gear 7 and the back gear 8 rotate in the same direction, but a rotational force in one direction is constantly applied to the back gear 8 by the spring 9 with respect to the first intermediate gear 7. Since the second pinion 11 and rack 1
"And backlash in meshing between the second intermediate gear 12 and the second drive gear 18 is eliminated.

Similarly, the second intermediate gear 12 and the back gear 8' rotate in the same direction, but a rotational force in one direction is constantly applied to the back gear 8' by the spring 9' with respect to the second intermediate gear 12. Therefore, backlash in the meshing between the first pinion 6 and the rack 1' and between the first intermediate gear 7 and the first drive gear 16 is eliminated.

Here, by arbitrarily setting the number of teeth of the gear group so that the rotational speeds of the first drive gear 16 and the second drive gear 18 are different, the spindle 3 is The amount of displacement can be specified in two different length units.

Next, another embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In FIGS. 3 and 4, the back gears 8 and 8/ described in the above embodiment are rotatably supported on a third shaft 22 supported between the dial gauge frame 2 and the main plate 4, and both back gears 8 and 8/ , 8' with a spring 23 interposed between the two back gears 8'.
, 8' are applied with preload, the back gear 8 is brought into mesh with the first drive gear 16, and the back gear 8' is brought into mesh with the second drive gear 18.

24 and 24' are short hands attached to the first shaft 5 and the second shaft 10, respectively.

In this embodiment, when the spindle 1 moves in one direction, the back gear 8 and the back gear 8' rotate in the same direction, but the spring 23 exerts a rotational force in the opposite direction on both the back gears 8 and 8'. is constantly applied, thereby eliminating backlash in the gear group.

Since the present invention has the above structure, the measured quantity can be measured in two different units of length, for example, a standard length and an extended length.
Alternatively, measure dimensions such as the scale and the wear scale using both phase needles 15 and 17.
It is possible to simultaneously indicate the two indicated values on the scale plate 19 and read the two indicated values at the same time using the scale on the scale plate 19.
There is no need for calculations using conversion tables, etc., as in the past, and the efficiency of measurement work can be improved.

Moreover, since the two hands are rotated on the same axis, the structure for indicating the measurement value can be made smaller, and the entire device can be made smaller.

Furthermore, since the driving force is transmitted to the two pointers separately by the two racks and the two pinions, the driving force acting on the meshing part of the rack and pinion is dispersed and the rack and pinion's durability is increased. Damage resistance can be improved.

Additionally, by driving the two pointers separately with two racks and pinions, the drive systems for the two pointers can be completely separated, making it easy to set the rotation ratio of the two points to an integral multiple. Become.

By setting the rotation ratio of the two hands to an integer multiple in this way, there is an advantage that dimensions can be simultaneously specified in two different length units using the two hands and one scale.

Moreover, the intermediate gears 7 and 12, which are energized by preloaded springs serving as backlash prevention means, are provided so as to act on the first drive gear and the second drive gear, respectively, so that the balance is good. Effective backlash prevention becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ of Fig. 1, Fig. 3 is a sectional view showing another embodiment of the invention, and Fig. 4 is a sectional view taken along It is a top view which shows the gear structure of a figure. 1...Spindle, 1', 1"...Rack, 2...
・Dial gauge frame, 6...1st pinion, 7, 12
...Intermediate gear, 8,8'...Back gear, 9,9,
23... Spring, 11... Second pinion, 15...
1st pointer, 16... 1st drive gear, 17... 2nd pointer, 18... 2nd drive gear.

Claims (1)

[Scope of utility model registration request] racks are formed at two locations on a spindle supported by a dial gauge frame, and a first pinion is meshed with each of the racks;
A second pinion is rotatably supported by the dial gauge frame, and a first drive gear is interlocked with each of the pinions;
A drive gear is positioned coaxially and rotatably supported by the dial gauge frame, and a nominal scale plate through which the shaft portions of the first drive gear and the second drive gear pass is attached to the dial gauge frame;
A first pointer and a second pointer are attached to the shaft portion of the first driving gear and the shaft portion of the second driving gear, respectively, a scale facing in the circumferential direction is provided on the scale plate, and further, using a preloaded spring,
and a gear for backlash prevention that directly acts on the first drive gear and the second drive gear, which is formed to be able to follow the rotation of the shafts of the first pinion and second pinion, on the dial gauge frame. A dial gauge which is rotatably provided and which indicates measurement dimensions in two different units of length, characterized in that the first drive gear and the second drive gear have different rotation ratios.