JPS5845917Y2 - Scale fine adjustment device for free parallel ruler - Google Patents

Description

[Detailed description of the invention] The present invention relates to a scale fine movement device for a universal parallel ruler, and conventionally, a scale mounting plate is rotatably connected to a base plate around a fulcrum shaft, and the scale is moved at a predetermined distance from the fulcrum shaft. One plate of the drawing board is used as a rotating shaft part, and an eccentric shaft is provided in which an eccentric cam part fits into a long hole of the other board, and the scale mounting plate is rotated by rotation of the eccentric shaft. A device is known in which the scale is rotated around a fulcrum shaft to perform fine adjustment of the scale, but in the case of this device, if a gap occurs between the eccentric cam portion and the elongated hole, the gap is enlarged. This causes play in the scale, so adjustment work is first required to remove the gap between the eccentric cam part and the long hole to prevent play during installation.However, due to wear due to use, the gap between the eccentric cam part and the long hole There is a gap between the two, which has the disadvantage of deteriorating the precision of the scale.

Therefore, the present invention has been developed to eliminate the gap between the eccentric cam part and the elongated hole by simply installing the above-mentioned scale fine adjustment device, eliminate the need for fine adjustment work to remove the looseness of the scale, and eliminate the need for long-term adjustment. It is an object of the present invention to provide a scale fine movement device in which no gap is created between the eccentric cam part and the long hole even if there is wear between the eccentric cam part and the elongated hole.

The present invention will be explained in detail with reference to the embodiments shown below.
In Fig. 1, 1 is a vertical rail, 2 is a head connecting part connected to a cursor board, 3 is a head part, 4 is its operating head, and 5 is a board side member, on the bottom of which a scale mounting plate 6 is attached. be.

7a and 7b are scales.

Reference numeral 8 denotes an operating lever for finely adjusting the scale relative to the substrate.

In the bottom view of FIG. 2 and the sectional view of FIG. 3, reference numeral 9 denotes a board that is integrated with the board side member 5, and the board 9 and the scale mounting plate 6 are connected to be rotatable around a fulcrum shaft 10. It is.

Reference numeral 11 denotes an eccentric shaft provided at a predetermined distance from the fulcrum shaft 10, and as shown in FIG.
and an eccentric cam portion 11b, the upper end and the square shaft portion 1
1C with a set screw 8a.

In the case of the embodiment, the rotating shaft portion 11a is rotatably fitted into a bearing hole 12a provided in the substrate 9 and the spacer 12, and the eccentric cam portion 11b is fitted in the scale mounting plate 6.
It fits into the elongated hole 13 of.

One side of the long hole 13 opens into a receiving hole 14 having a tapered surface 14a, and a portion of the eccentric cam portion 11b that fits into the receiving hole 14 protrudes from the opening in the direction of the receiving hole 14.

13a is a reinforcing plate for the receiving hole 13. Reference numeral 15 denotes an extrusion piece having a tapered surface 15a opposite to the tapered surface 14a, and is configured to be loosely fitted into the receiving hole 14 and movable along the tapered surface 14a of the receiving hole 14.

15b is a cam contact surface that comes into contact with the eccentric cam portion 11b.

Further, an elongated attachment hole 15C is provided approximately at the center of the extrusion piece 15, and the extrusion piece 15 is attached to the substrate 9 by a support screw 16 having a shaft portion 16a that is loosely fitted into the attachment hole 15C.

Reference numeral 17 denotes a tension spring constituting the pressing means according to the present invention, one end 17a of which is attached to a pin 18 planted on the substrate 9, and the other end 17b attached to the end of the extrusion piece 15.

Then, by the pressing means consisting of the tension spring 17, etc.,
The extrusion piece 15 is pressed in the direction of the pin 18, and the tapered surface 15a
is pressed against the tapered surface 14a of the receiving hole 14, and the cam contact surface 15b is pressed against the eccentric cam portion 11b.

In addition, in the substrate 9, 19a is a relief hole for the tension spring 17, and 19b and 19C are mounting holes for the support screw 16 and pin 18, respectively.

According to the scale fine movement device according to the present invention having the above configuration, the pushing piece 15 installed in the receiving hole 14 is pressed by the tension spring 17 so that the tapered surface 15a is pressed against the receiving hole 1.
4, the cam contact surface 15b abuts the eccentric cam part 11b, and the eccentric cam part 11b abuts the reinforcing plate 13a of the elongated hole 13, so that the eccentric cam No gaps are created between the part 11b, the elongated hole 13, and the extrusion piece 15, and there is no need for any adjustment work to prevent the scale from wobbling during installation, while eccentricity may occur due to long-term use. Even if wear occurs at the contact portion between the cam portion 11b, the elongated hole 13, and the extrusion piece 15, the extrusion piece 15 moves in a direction to eliminate the gap, so that the scale does not rattle due to wear. can be prevented.

As described above, the present invention has successfully achieved its original purpose and has great practical benefits.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted plan view of an embodiment of the device of the present invention, Fig. 2 is a bottom view of the main parts thereof, and Fig. 3 is II of Fig. 1.
A longitudinal side view of the main part shown longitudinally along the I-III line,
FIG. 4 is an exploded perspective view of the main parts. 1: Vertical rail, 2: Head connection section, 4: Operation head, 6
: Scale mounting plate, 8: Operation lever, 9: Board, 10:
Fulcrum shaft, 11: Eccentric shaft, 13: Long hole, 14: Receiving hole, 15
: Extrusion piece, 16: Support screw, 17: Tension spring, 18: Pin.

Claims (1)

[Scope of utility model registration request] A scale mounting plate is rotatably connected to the base plate around a fulcrum shaft, and one plate of the drawing board is used as a rotating shaft part at a predetermined distance from the fulcrum axis, and a scale mounting plate is connected to the base plate in a long hole in the other plate. A flexible parallel ruler is provided with an eccentric shaft into which an eccentric cam part is fitted, and when the eccentric shaft is rotated, the scale mounting plate is rotated about the fulcrum shaft to perform fine adjustment of the scale, A receiving hole having a tapered surface is provided on one side of the elongated hole that the eccentric cam portion comes into contact with, and a pressing piece movable along the tapered surface is provided in the receiving hole, and the pressing piece is arranged on the tapered surface. A scale fine movement device for a universal parallel ruler, which is provided with a pressing means for pressing the eccentric cam portion to press it.