JPH0692200B2 - Breaking device in head of universal parallel ruler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a brake device for a base line, an angle, etc. in a head of a universal parallel ruler.

[Conventional technology]

As shown in Japanese Utility Model Publication No. Sho 49-41393, the universal parallel ruler head holds the protractor plate at a desired rotation angle with respect to a head support substrate which is movable in parallel while maintaining a certain angle on the drawing board. It is provided with a baseline brake device for releasable fixing, and an angle brake device for releasably fixing the main shaft side with respect to the supporting substrate at the supporting substrate side or the protractor at an arbitrary rotation angle.

The structure of these brake devices is such that the shaft member is supported at a fixed position on the fixed member, while a groove having a wide bottom is formed in the fixing member along the circumferential direction, and the locking member formed on the shaft member is formed in the groove. A member is arranged, the shaft member is changed in a pulling direction by a lever operation, and the locking member is pressed against the wall surface forming the narrow portion of the wide groove to fix the fixing member to the fixed member. There is.

[Problems to be solved by the invention]

The fixing member, for example, the protractor is made of aluminum in order to reduce the weight of the head. Therefore, when a large pressure is applied to the locking member on the narrow wall surface of the wide-width groove of the protractor board, the portion under pressure is deformed,
Alternatively, there is a defect that the narrow wall surface is worn and a large braking force cannot be obtained. The present invention aims to eliminate the above defects.

[Means for solving problems]

To achieve the above object, the present invention provides a device for releasably fixing a rotatable fixing member to a fixed member at an arbitrary angle, wherein the fixing member has a circular line centered on its rotation center. A brake plate made of a high-strength flexible thin plate is fixed to the fixing member so that a wide groove is formed between the groove and the groove, and the brake plate is slid in the axial direction on the fixed member. The fixed shaft is freely positioned, a locking member is provided on the fixed shaft, the locking member is arranged in the wide bottom groove, a protrusion is provided on the fixed member side, and the protrusion is provided on the fixed shaft. It is arranged so as to be in contact with the upper surface of the surrounding brake plate, and a lifting mechanism is linked to the fixed shaft so that the brake plate can be pressed between the protrusion and the locking member by the lifting mechanism.

[Action]

In the above structure, when the fixed shaft is pulled up by the pulling mechanism, the brake plate is pinched by the upper surface of the locking member and the protrusion, and the fixed member is firmly fixed to the fixed member via the brake plate. Even if the pulling force of the fixed shaft is increased, since the brake plate is made of a high-strength thin plate material having elasticity, it does not permanently deform, and the problem of wear does not occur.

〔Example〕

Hereinafter, a baseline brake device having the configuration of the present invention shown in the accompanying drawings will be described.

Reference numeral 2 is a main shaft of a known rail type parallel ruler, which is rotatably supported by a tubular double shaft 4. Reference numeral 6 denotes a support base made of aluminum, which is supported by a well-known parallel movement support mechanism so as to be movable in parallel while maintaining a predetermined angle on the drawing board. The parallel movement support mechanism and the support base are described in detail in FIGS. 3 and 1 of JP-A-61-104896, or other special publications.
The multiple shaft 4 is fixed to the support base 6 (fixed member). A scale mounting plate (not shown) to which a scale is attached is fixed to the lower end of the main shaft 2, and the scale can be rotated on the drawing plate by rotating the main shaft 2. A fixed plate 8 made of aluminum is fixed to the support base 6 by screws. A tubular projection 8a is formed on the fixed platen 8, and a fixed shaft that is loosely fitted in a hole formed in the support base 6 in a shaft hole of the projection 8a.
10 is slidably inserted. Reference numeral 12 is an aluminum graduation plate (fixing member) which is rotatably fitted to the multi-shaft 4, and a groove 13 is bored along a circle line centering on the rotation center thereof. A locking member 10a formed at the tip of the fixed shaft 10 is disposed in the groove 13 so as to be movable along the longitudinal direction of the groove 13. The width of the groove 13 is formed to be slightly wider than the width of the locking member 10a. Reference numerals 14 and 16 denote ring-shaped inner side brake plates, which are arranged on the protractor plate 10, and a ring-shaped spacer 18 is arranged between the brake plates 14 and 16. Reference numeral 20 denotes a ring-shaped inner pressing plate, which is placed on the brake plate 16. Six screw holes 22 are formed at regular intervals along a circle centered on the center of rotation of the protractor board 10. Corresponding to the screw holes 22, the holding plate 20 and the brake plate are provided. Through holes are formed in the plates 14 and 16 and the spacer 18. A countersunk screw 24 is inserted into the through hole, and the countersunk screw 24 is screwed into the screw hole 22 to firmly secure the brake plates 14 and 16, the spacer 18 and the holding plate 20 to the protractor board 1.
It is fixed at 0. The tapered portion of the head of the flat head screw 24 is tightly fitted to the tapered portion formed in the through hole of the holding plate 20.
Reference numerals 26 and 28 denote ring-shaped outer brake plates, and the protractor plate 1
2, a ring-shaped spacer 30 is arranged between the brake plates 26, 28. Reference numeral 32 denotes a ring-shaped outer pressing plate, which is placed on the brake plate 28. Six screw holes 34 are formed on the outer side of the graduation plate 12 at regular intervals along a circle centered on the center of rotation, and the screw holes 24
Corresponding to the above, through holes are formed in the pressing plate 32, the brake plates 28, 26, and the spacer 30. A flat head screw 36 is inserted into the through hole, and the flat head screw 36 is screwed into the screw hole 34 to firmly fix the brake plates 26, 28, the spacer 30 and the holding plate 32 to the protractor plate 12. . The tapered portion of the head of the flat head screw 36 is closely fitted to the tapered portion formed in the through hole of the holding plate 32. The inner brake plates 14 and 16 and the outer brakes 26 and 28 are
Opposed with a spacing slightly wider than the diameter of the fixed shaft 10,
The interval is formed along a circle centered on the center of rotation of the protractor plate 12, and the fixed shaft 10 is inserted and arranged in the interval. The opposing portions of the inner and outer brake plates form a narrow space portion with respect to the opening of the groove 13, and the narrow space portion 38 and the groove 13 form a wide bottom groove. Brake plate 1
4, 16, 26, 28, the holding plates 20, 32 and the spacers 18, 30 are made of flexible high-strength hard thin plates such as stainless thin plates. The tip surface of the protrusion 8a is the brake plate.
Abuts the upper surface of 16,28. On the outer peripheral surface of the fixed shaft 10, a hole of an intermediate brake plate 40 made of a stainless steel thin plate is formed.
42 is slidably inserted, and both sides of the brake plate 40 are slidably arranged between the brake plates 14 and 16 and between the brake plates 26 and 28. Holes 44, 4 are formed in front of and behind the brake plate 40.
6 is transparently provided, and the pin 48 protruding from the locking member 10 is provided in the hole.
50 is slidably fitted, and brake plate 40 is locking member 10.
It is configured so as not to shift in the rotational direction with respect to a. Five
Reference numeral 2 is a baseline lever, to which a nut 54 with a collar is fixed. The nut 54 is screwed onto the threaded portion of the fixed shaft 10. The collar portion 54a of the nut 54 faces the upper surface of the support base 6 via a washer 56. A plurality of protrusion shafts 58 and 60 projecting from the pressing plates 20 and 32 along the concentric circles at predetermined intervals are provided with the brake plates 14, 16, 26 and 28 and the spacer 1.
Pressed into 8,30 corresponding holes. Locking member 10a and mechanism for pulling it up, projection 8a, brake plates 14 and 16
The brake plate 40, the brake plates 26 and 28, and the brake plate 40 form a multi-plate brake mechanism. Incidentally, in FIG. 6, a to f and A to F indicate the press-fitted portions of the projection shafts 58 and 60.

Next, the operation of this embodiment will be described. The lever 52 is swung in the direction to release the pulling force of the nut 54 against the fixed shaft 10 and is connected by a known index mechanism (not shown) on the main shaft 2 side. When the main shaft 2 is operated and rotated, the protractor plate (fixing member) 12 rotates about the outer peripheral surface of the multi-shaft 4. When the protractor plate 12 is set to a desired angle and the base line lever 52 is swung in the tightening direction, the fixed shaft 10 is pulled up by the rotation of the nut 54, and the locking member 10a moves the brake plates 14 and 26 upward. Press on the brake plates 14, 40, 16 and 2
6,40,28 are pressed by the lower surface of the protrusion 8a and the upper surface of the locking member 10a. This pressure causes the brake plates 14, 16 and 26, 28 to
Is fixed to the fixed platen 8 by crimping, and the protractor plate 12 is fixed to the fixed platen 8. When the lever 52 is swung in the opposite direction, the above fixing is released. The nut 54 and the base line lever 52 constitute a pulling mechanism for pulling up the fixed shaft 10.

When the brake plate 40 is rotatable with respect to the fixed shaft 10, when a strong external stress is applied to the protractor plate 12 and a rotational force acts on the protractor plate 12, the protractor plate is placed inside the brake plate 40. The rotating force of 12 strongly acts, whereby the brake plate 40 rotates with respect to the fixed shaft 10, and the protractor plate 12 shifts in the rotating direction. However, in the present embodiment, since the brake plate 40 is coupled to the locking member 10a by the pins 48 and 50 so as not to rotate, the above inconvenience does not occur.

〔effect〕

Since the present invention is configured as described above, it has the following effects.

(1) Since the narrow width portion forming wall of the wide bottom groove is configured by the flexible thin plate brake plate having high strength which is separate from the fixing member, the braking force is firmly applied to the narrow width portion forming wall. Therefore, the fixing member can be firmly fixed to the fixed member.

(2) Since the multiple thin-plate brake plates are stacked to form a multi-plate brake structure, the fixing member can be firmly fixed to the fixed member.

(3) Since the brake plate engaging with the fixed shaft of the multi-plate brake structure is coupled to the locking member so as not to shift in the rotation direction, the brake plate does not move even if strong external stress acts on the fixing member. There is no possibility that the fixed member will be displaced in the rotation direction due to rotation.

[Brief description of drawings]

1 is a sectional view of a main part, FIG. 2 is an exploded perspective view of parts, FIG. 3 is a sectional view, FIG. 4 is a sectional view, FIG. 5 is a plan view, and FIG.
The figure is a plan view. 2 …… spindle, 4 …… multi-axis, 6 …… support base, 8 …… fixing board, 8
a …… Projection body, 10 …… Fixed axis, 12 …… Protractor, 12 …… Groove, 14,
16 …… Inner brake plate, 18 …… Spacer, 20 …… Presser plate, 2
2 …… Screw hole, 24 …… Counter screw, 26,28 …… Outside brake plate, 3
0 …… Spacer, 32 Presser plate, 34 …… Screw hole, 36 …… Counter screw, 3
8 …… narrow space, 40 …… intermediate brake plate, 42 …… hole, 44, 4
6 …… Hole, 48, 50 …… Pin, 52 …… Baseline lever, 54 …… Nut, 54a …… Collar part, 56 …… Washer, 58, 60 …… Projection

Claims (3)

[Claims] 1. An apparatus for releasably fixing a rotatable fixing member to a fixed member at an arbitrary angle,
A brake plate made of a high-strength flexible thin plate is formed in the fixing member so that a groove is formed in the fixing member along a circle line centering on its rotation center and a wide bottom groove is formed between the groove and the groove. Fixed, the fixed shaft is positioned so as to be slidable in the axial direction on the fixed member, and the locking member is provided on the fixed shaft,
The locking member is arranged in the bottom wide groove, a protrusion is provided on the fixed member side, the protrusion is arranged in contact with the upper surface of the brake plate around the fixed shaft, and the pulling mechanism is attached to the fixed shaft. A brake device for a head of a universal parallel ruler, wherein the brake plate can be pressed between the protrusion and the locking member by the pulling mechanism. 2. An apparatus for releasably fixing a rotatable fixing member to a fixed member at an arbitrary angle,
Grooves are formed in the fixing member along a circle centered on its rotation center, and a plurality of brake plates made of flexible thin plates having high strength are fixed to the inside and the outside of the fixing member, respectively. A narrow space is formed on the groove along the groove at a portion where the plurality of brake plates and the plurality of outer brake plates face each other, and the intermediate brake plate is provided between the inner and outer brake plates and between the inner and outer brake plates. And the fixed shaft is slidably fitted in the axial hole of the projection provided on the fixed member side in the axial direction, the fixed shaft is arranged in the narrow space portion, and the fixed shaft is arranged at the intermediate position. The locking member is fitted in the hole of the brake plate, the locking shaft is provided with the locking member, and the locking member is arranged in the groove so as to be relatively movable along the groove, and the protrusion is opposed to the inner and outer brake plates. Place it in contact with the top surface of the part to be fixed In the head of the universal parallel ruler, the pulling mechanism is linked to the inner and outer brake plates and the intermediate brake plate between them, so that they can be pressed between the protrusion and the locking member. Brake device. 3. A device for releasably fixing a rotatable fixing member to a fixed member at an arbitrary angle,
Grooves are formed in the fixing member along a circle centered on its rotation center, and a plurality of brake plates made of flexible thin plates having high strength are fixed to the inside and the outside of the fixing member, respectively. A narrow space is formed on the groove along the groove at a portion where the plurality of brake plates and the plurality of outer brake plates face each other, and the intermediate brake plate is provided between the inner and outer brake plates and between the inner and outer brake plates. And the fixed shaft is slidably fitted in the axial hole of the projection provided on the fixed member side in the axial direction, the fixed shaft is arranged in the narrow space portion, and the fixed shaft is arranged at the intermediate position. It is fitted into a hole of a brake plate, a locking member is provided on the fixed shaft, and the locking member is relatively movably arranged along the groove in the groove, and the intermediate brake plate is mounted on the fixed shaft. Does not rotate with respect to the fixed shaft and Movably in the direction, the protrusions are arranged in contact with the upper surfaces of the opposing portions of the inner and outer brake plates, and a lifting mechanism is linked to the fixed shaft. A brake device for a head of a universal parallel ruler, characterized in that an intermediate brake plate can be pressed between the protrusion and the locking member.