JPH0712072Y2 - Brake device for head of drafting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a braking device for a head portion of a drafting machine, and more specifically, a thin disc-shaped brake plate is integrally attached to a graduation plate of the head portion, and the brake plate is sandwiched by the action of a solenoid. Thus, the present invention relates to a brake device for fixing the head at an arbitrary angle.

(Prior Art and its Problems) Conventionally, as a brake device of this type, a brake member holding a thin brake plate integrally attached to a protractor of a head portion of a drafting machine is driven by a piezoelectric element. (Practical application Sho 63-83495) or forming a dovetail groove on the protractor plate,
A piece member provided with a screw shaft is movably provided therein, and the piece member is loosely engaged with the dovetail groove by rotating a brake lever provided on the screw shaft, so that the piece member can be moved to an arbitrary angle on the protractor board. Those that fix the scale (Jitsuko Sho 52-15873) are known. In the former method, the minimum displacement generated in the piezoelectric element is magnified by a magnifying mechanism and adopted as a brake device source, or even the minimum displacement is responded to by the brake device by dimensional control. There is.

However, the method using the piezoelectric element has a drawback that the cost increases because a magnifying mechanism is incorporated in the head portion and high-precision part size control is required. Further, in the case of the method of rotating the brake lever, the designer must hold the head at a desired angular position until the rotation operation of the brake lever is completed. But,
Since a considerable force is applied when rotating the brake lever, it is easy to cause a deviation in the rotating direction, and repeated operation is required for accurate positioning, which hinders smooth design and drawing work. It was

(Technical problem of the invention) The present invention solves the above-mentioned drawbacks, and in particular, by sandwiching a thin brake plate integrally attached to the protractor plate of the head portion by the driving force of the solenoid, the head portion can be set at an arbitrary angle. It is a technical problem to propose a head braking device in a drafting machine that can be fixed.

(Means for Solving the Problem) In order to solve the above-mentioned problems, a braking device for a head portion in a drafting machine according to the present invention has Direction, a thin disc-shaped brake plate, a pair of brake members that sandwich the outer edge of the brake plate, and a rotating body that rotates to displace the brake member in the direction that sandwiches the brake plate. A solenoid for driving a wire wound around the outer circumference of the rotating body and a spring means for returning the rotated rotating body to the original position are provided.

(Operation) When the solenoid drive switch is turned on, the wire is pulled and driven to rotate the rotating body, and this rotating force causes the brake member to be displaced and clamp the brake plate. Since the brake plate is integrally attached to the protractor plate of the head portion of the drafting machine, the brake plate is clamped and at the same time rotation of the head portion is prevented, so that braking is performed.

On the other hand, when the solenoid drive switch is turned off,
Since the rotating body returns to its original position by the spring action of the spring means, the clamping force on the brake plate is released, and the brake action on the head portion is released, and the rotor becomes free.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows the outline of the drafting machine (universal parallel ruler).
A drawing board 1, a horizontal rail 2 fixed to the upper edge of the drawing board 1, a vertical rail 4 connected to a carriage 3 moving along the horizontal rail 2, and a carriage moving along the vertical rail 4. It is composed of a head portion 7 provided at the tip of a moving member 6 which is connected to 5 via a hinge, and a scale 8 supported by the head portion 7.

As shown in FIGS. 2 to 4, the head portion 7 is formed by integrally forming a head grip portion 7a, a sub shaft body 7b, and a scale mounting plate 10. The sub shaft body 7b is attached to the moving member 6. It is rotatably supported on the fixed main shaft body 9. A scale 8 is mounted on the scale mounting plate 10.
The protractor 11 showing the degree of rotation of the scale 8 is provided with the moving member 6
The scale mounting plate 10 is provided so as to rotate independently.

By the way, for example, when the scale 8 is aligned with the baseline of the drawing, when it is necessary to draw at a double angle of 15 ° or at an arbitrary angle such as 12 ° or 47 °, the protractor 11 and the moving member 6 or It is necessary to integrally fix the protractor plate 11 and the scale mounting plate 10 so as not to rotate, and a brake device is provided for each of them.

Of the above braking devices, the scale mounting plate for the protractor board 11
The brake device for braking the rotation with respect to 10 is configured as follows.

First, a steel disc-shaped brake plate 12 is projected from the outer edge of the protractor plate 11 in the outer diameter direction.

On the other hand, in the outer diameter direction of the protractor plate 11 of the scale mounting plate 10, a pair of brake members 13 and 14 provided to face each other so as to sandwich the outer edge of the brake plate 12, and the brakes. A rotating body 15 that displaces the members 13 and 14 in the direction in which the brake plate 12 is sandwiched and a solenoid 16 that rotationally drives the rotating body 15 are provided.

The rotating body 15 is screwed onto a screw shaft 17 provided upright on the end portion of the scale mounting plate 10 and is vertically movable by a thrust bearing 18. The rotating body 15 is composed of a brake nut 15a screwed onto the screw shaft 17 and an adjusting nut 15b attached to the outside of the brake nut 15a. At the top of the brake nut 15a, a nut 1
9 is installed. Further, a key groove 20 having a triangular cross section that fits with each other is cut and meshed with the outer peripheral surface of the brake nut 15a and the inner peripheral surface of the adjustment nut 15b. Further, a set screw 21 for locking the wire is attached to a part of the outer peripheral surface of the adjusting nut 15b.

The brake members 13 and 14 respectively penetrate the screw shaft 17,
They are provided below the thrust bearing 18 so as to face each other vertically.

The lower brake member 13 is fixed on the scale mounting plate 10, a receiving groove portion 22 having a trapezoidal cross section is formed on one end upper surface thereof, and the other end upper surface thereof receives the brake plate 12.
And the receiving surface 23 is formed in a flat shape.

On the other hand, one end of the upper brake member 14 is bent downward, and the bent end surface 24 is rounded as an arc surface and is engaged in the receiving groove portion 22 at one end of the lower brake member 13.
Further, the other end lower surface 25 faces the receiving surface 23 of the lower brake member 13 and is formed in a flat shape.

A coil spring 26 is provided between the pair of brake members 13 and 14, whereby the pair of brake members 13 and 14 is provided.
Are always urged away from each other to free the brake plate 12.

Incidentally, the receiving groove portion 22 is formed in the upper brake member 14,
The lower brake member 13 may be engaged. Also, as shown in FIG. 5, recesses are formed in both brake members 13, 14.
The configuration may be such that 27 and 28 are formed and a ball 29 is interposed between them.

Next, the solenoid 16 is provided in the vicinity of the rotating body 15, and the solenoid cover 30 is fixed to the upper portion of the solenoid 16. Then, a wire 31 is wound around the outer periphery of the rotating body 15, one end of the wire 31 is fixed to the rotating body 15 by a set screw 21, and the other end of the wire 31 is a rod 16a of a solenoid 16.
Installed on. The drive switch 32 of the solenoid 16 is an operating rod for operating the connecting pin 33 in the sub shaft body 7b.
It is provided in part of 38.

Further, a spring means 34 for returning the rotated rotating body 15 to the original position is locked to the locking piece 30a of the solenoid cover 30, and a return wire 35 is attached to the set screw 21 of the rotating body 15. . The driving and returning wires 31, 35 have their tension directions changed by pins 36, 37, respectively,
The 15 are stretched so that they can rotate in opposite directions.
In addition, adjustment of the two wires 31 and 35 is performed by the brake nut 15
It may be performed by adjusting the meshing state between a and the adjusting nut 15b.

Next, in order to fix the protractor board 11 at an arbitrary angle by the brake device having the above-described configuration, the operating rod 38 is moved to the left in the figure, and the connecting pin 32 in the auxiliary shaft body 7b is driven to operate. The rod 39 allows the scale mounting plate 10 and the scale 8 to freely rotate with respect to the protractor plate 11, and the spindle 9 and the protractor plate 11 connected and fixed to the moving member 6 are integrally fixed by a connecting means (not shown). The head portion 7 is rotated in this state. When the head unit 7 is rotated to a desired angle, a drive switch for the solenoid 16
Turn on 32. This allows the rod 16 of the solenoid 16 to
Since a is retracted and the drive wire 31 is pulled against the elastic force of the spring means 34, the rotating body 15 rotates clockwise in the figure, and the rotating body 15 rotates the screw shaft fixed to the scale mounting plate 10. It moves downward in the side view by screwing with 17. Rotating body
The lower brake 15 moves the upper brake member 14 to the coil spring 26.
The rocking plate 12 swings downward against the elastic force of and the brake plate 12 is sandwiched between it and the lower brake member 13. Brake plate 12 is a protractor
Since it is attached integrally with 11, the rotation of the protractor board 11 is also blocked and braking is performed. At this time, the upper brake member 14 swings around the arcuate surface 24 of the bent end, and the brake plate receiving surface 23 of the lower brake member 13 and the upper brake member
Since the opposing surface 25 of 14 is formed in a flat shape, the brake plate 12 and the brake member are in surface contact with each other, and the braking force is strong and uniform.
12 is not easily scratched.

Since the above-mentioned braking operation is always performed together with the operation of the operating rod 38 (the operation of separating the ratchet pawl (not shown) from the ratchet wheel), the operating rod 38 and the solenoid drive switch 32 are arranged in association with each other to improve the efficiency. Operation becomes possible. Also, the above switch 32
Since it is not necessary to provide the head portion 7 outside the head portion 7,
The appearance of can be kept good in terms of design.

On the other hand, when the solenoid drive switch 32 is turned off, the rod 16a extends and the drive wire 31 loosens.
The rotating body 15 is rotated counterclockwise in the figure by the spring means 34 to return to the original position, and moves upward along the screw shaft 17. At the same time, the upper brake member 14 moves upward by the coil spring 26, so that the clamping force of the brake plate 12, that is, the braking force is released, and the head portion 7 becomes free with respect to the moving member 6.

(Effects of the Invention) The present invention utilizes the driving force of the solenoid to brake the protractor board, and when the head is rotated to a desired angle, the braking force can be immediately applied to the head. ,
Moreover, unlike the conventional manual method, no positional deviation occurs, so that the drawing work can be smoothly performed.

Further, since the brake plate integrally attached to the protractor of the head portion is sandwiched by the pair of brake members, the brake member is disposed at a position apart from the head portion. Therefore, unlike the conventional device, the protractor plate does not require the processing of forming the dovetail groove in the concentric circle,
Since it is only necessary to attach a thin disc-shaped brake plate having a large diameter, the head part can be easily assembled.

Further, since the brake member clamps the outer edge portion of the brake plate integrally provided in the outer diameter direction of the dividing plate, a large braking force can be obtained with a small clamping pressure.

Furthermore, the solenoid is not directly sandwiched between the brake plates, but the solenoid is configured to be wound around the outer circumference of the rotating body via a wire, so that the position of the solenoid is not specified. Therefore, the degree of freedom in designing the position of the solenoid is increased.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a drafting machine according to the present invention, FIG. 2 is a plan view of a main part of a brake device for a head portion in the drafting machine, and FIG. 3 is a sectional view taken along line XX of FIG. FIG. 4 is an exploded perspective view of the brake device, and FIG. 5 is an explanatory view of another support mode of the brake member. Reference numeral 7 ... Head part, 11 ... Protractor board, 12 ... Brake plate, 13 ... Lower brake member, 14 ... Upper brake member, 15 ... Rotating body, 16 ... Solenoid, 32 ... Solenoid drive Switch, 34 ... Spring means

Claims (1)

[Scope of utility model registration request] 1. A thin disc-shaped brake plate integrally projecting radially outward from an outer edge of the protractor with respect to a protractor of a head of a drafting machine, and the outer edge of the brake plate is sandwiched. A pair of brake members, a rotating body that rotates to displace the brake member in a direction that clamps the brake plate, a solenoid that drives a wire wound around the outer periphery of the rotating body, and the rotated rotating body. A braking device for a head portion in a drafting machine, comprising: spring means for returning to an original position.