JPH0485096A - Parallel rule device - Google Patents

Abstract

PURPOSE:To prevent the breaking of a flat belt and to smooth the running between pulleys by providing the flat belt entrained over belt pulleys, the longitudinal cursors connected to the linear running parts formed along a pair of longitudinal rails and the traverse rule connected to the longitudinal cursors at both end parts thereof. CONSTITUTION:A pair of the longitudinal rails 6, 8 arranged in parallel on both sides of a drawing board 2, the belt pulleys 34, 36 supported at the respective one ends of said rails in a freely rotatable manner, the belt pulleys 40, 42, 44, 46 supported at the other ends thereof in a freely rotatable manner and the traverse rule 24 connected to longitudinal cursors 10, 12 at both end parts thereof are provided. The longitudinal cursor 12 is connected to the lower linear running part 48a of the belt 48 between the pulleys 34, 40 through a clutch mechanism and the longitudinal cursor 12 is fixed to the upper linear running part 48b of the flat belt 48 between the pulleys 36, 46 through a belt fixing means 54. When moving force is applied to the traverse rule 24 by manual operation, the linear running part connected through the longitudinal cursor 10 of the belt 48 is driven and the other end part thereof is driven by the same quantity along the longitudinal rail 8 by the movement of the belt 8.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a belt-driven parallel ruler device.

[Conventional technology]

Conventionally, there are two types of horizontal ruler guide mechanisms for moving the horizontal ruler in parallel along a vertical rail when the horizontal ruler is manually driven: a wire drive system and an interlocking shaft type timing belt system.

In the wire drive method, as shown in Japanese Utility Model Publication No. 11026/1982, both ends of the horizontal ruler are configured to move by the same amount in the same direction along the vertical rail by the movement transmission action of the wire. In the interlocking shaft type timing belt system, pulleys are rotatably supported at both ends of left and right vertical rails, and an endless timing belt is stretched around the pulleys. Both ends of the horizontal ruler are connected to the timing belt via a vertical cursor movably attached to a vertical rail. The pulleys rotatably supported by the left and right vertical rails are connected by a transmission shaft, and these structures enable translation of the horizontal ruler.

[Problem that the invention seeks to solve]

Since the wire used in the above-mentioned wire drive method is basically a collection of thin wires, there is a risk that the wire may unravel due to tension or friction with the pulley, and thereby break. In addition, if the clutch mechanism part between the wire and the vertical cursor for sandwiching the wire is left in a half-clutched state in order to tilt the horizontal ruler, the wire may break due to the frictional force with the clutch plate. It existed.

In the above-mentioned interlocking shaft type timing belt system, if a clutch mechanism that sandwiches the timing belt is provided, the threads of the timing belt may be damaged due to sliding with the clutch plate. Therefore, a clutch mechanism is provided on the interlocking shaft part. However, there was a flaw in the structure that made it complicated.

The present invention aims to eliminate the above-mentioned defects.

[Means to solve problems]

In order to achieve the above object, the present invention includes a pair of vertical rails 6.8 arranged in parallel on both sides of the drawing board 2, and a rotatable shaft at each end of the vertical rails 6.8. A supported belt pulley 34, 36, and a pair of belt booths 40, 42 rotatably supported on an axis substantially perpendicular to the two surfaces of the drawing board, one pair each at each other end of the vertical rail 6.8. ,44.4
6 and the belt pulley 34° 4 so that a pair of straight running portions are formed along each of the vertical rails 6.8.
0.42, 44, 46, 36, and the pair of vertical rails 6.8 of the belt 48 are movably attached to each of the pair of vertical rails 6.8. a vertical cursor 10°12 connected to a straight line running portion along each of the vertical cursors 10 and 12;
The horizontal ruler 24 is connected to the horizontal ruler 24 at both ends thereof.

[Effect]

When the horizontal ruler 24 is manually pressed in the longitudinal direction of the vertical rail 6.8, a moving force is applied to the horizontal ruler 24.

As the horizontal ruler 24 moves toward one end, a linear running section of the pair of straight running belts 48 on the one end side, which is connected to one end of the horizontal ruler 24 via the vertical cursor 10, is driven. Due to this drive, the other end of the horizontal ruler 24 is driven along the vertical rail 8 by the movement of the belt 48 by the same amount in the same direction as the movement of the one end, and the horizontal ruler 24 is moved along the vertical rail 6.8 by the movement of the belt 48. Translate parallel along.

〔Example〕

The structure of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

2 is a drawing board to which a pencil holder 4 is attached. A pair of vertical rails 6.8 are fixed to both sides of the drawing board 2 so as to be parallel to each other.

The vertical rail 6.8 is constituted by a hollow member with a square cross section. A vertical cursor 10.12 is movably attached to each of the vertical rails 6.8 via rollers. A vertical portion 14a of a mounting plate 14 is rotatably supported by a shaft 16 on the vertical cursor 10, and one end of a ruler holder 18 is rotatably supported on a horizontal portion 14b of the mounting plate 14 around a shaft 20. It is supported slidably along the elongated hole 22 of the horizontal portion 14b. The ruler holder 18
The attachment mechanism for the other vertical cursor 12 is also the same as the second one described above.
The mechanism is the same as the one shown in the figure. The ruler holder 18 includes:
A horizontal ruler 24 is fixed. On the bottom wall of each end of the vertical rail 6.8, a pulley shaft 26.28 is attached to a fixture 30.
32, and belt pulleys 34, . 36 is rotatably fitted.

As shown in FIGS. 3 and 5, the pulley support shafts 26, 28 are perpendicular to the two surfaces of the drawing board within a plane perpendicular to the two surfaces of the drawing board and perpendicular to the vertical rail 6°8. It is inclined at approximately 30 degrees with respect to the axis. As shown in FIG. 1, pulley support shafts 38 (see FIG. 6) perpendicular to the two planes of the drawing board are disposed at each other end of the vertical rails 6.8, and these pulley support shafts 3
8, a pair of belt pulleys 40.42 and 44.4, respectively.
6 is rotatably fitted. The pulleys 34, 40,
As shown in FIG. 1, an endless flat belt 48 is stretched over the belts 42, 44, 46, and 36 with an appropriate tension. A vertical cursor 10 is connected to a lower straight running portion 48a of the belt 48 between the pulleys 34 and 40 via a clutch mechanism. In the clutch mechanism, as shown in FIG. 4, a clutch plate 48 is fixed to the vertical cursor 10, and the tip of a shaft body 50 with a molding 52 that is screwed into a screw hole of the vertical cursor 10 is attached to the clutch plate 48. A lower straight running portion 48a of the flat belt 48 is disposed between the tip of the shaft body 50 and the clutch plate 48 so as to face each other. Upper straight running portion 4 of flat belt 48 between pulley 36 and pulley 46
A vertical cursor 12 is connected to 8b via a known belt fixing means 54. The vertical cursor 12 is configured to be removably fixed to the vertical rail 8 by a known brake mechanism (not shown) having a brake lever 56.

Next, the operation of this embodiment will be explained.

When you want to adjust the inclination angle of the horizontal ruler 24.

Loosen the molding 58 and insert both ends of the ruler holder 18 into the long holes 22.
The vertical cursor 12 is fixed to the vertical rail 8. Furthermore, the molding 52 is rotated to release the clamping force between the shaft body and the clutch plate 48 against the flat belt 48, and the vertical cursor 10 is moved vertically independently of the vertical cursor 12 with this clamping force in a half-clutch state. It is allowed to move freely along the rail 6. Next, move the vertical cursor 12 along the vertical rail 6,
Set the horizontal ruler 24 to a desired inclination angle. Vertical cursor 1
0 moves along the vertical rail 6, the clutch plate 48
slides in a half-clutched state while contacting the flat belt 48.

Next, the molding 58 is rotated in the tightening direction to fix both ends of the ruler holder 18 to the horizontal part 14b of the mounting plate 14, and the molding 52 is rotated in the tightening direction to fix the clutch plate 48.
The belt 48 is held between the shaft body 50 and the vertical cursor 10.
is fixed to the belt 48.

Next, the vertical cursor 12 is released from the vertical rail 8, and the horizontal ruler 24 is manually pressed in a direction that is horizontal to the two surfaces of the drawing board and perpendicular to the long direction of the horizontal ruler 24. When the horizontal ruler 24 is pushed, the lower straight running portion 48a of the belt 48 on the one end side is driven as the horizontal ruler 24 moves toward the one end side, and this driving force is applied to the upper straight line of the belt 48. The movement is transmitted to the running section 48b, and both ends of the ruler holder 18 are guided in the same direction and by the same amount by the movement of the belt 48.
The horizontal ruler 24 moves in parallel along the vertical rail 6.8.

Note that due to the inclination of the pulleys 34 and 36, the distance between the pulley 34 and the pulleys 40 and 42, and between the pulley 36 and the pulleys 44 and 4 is
The torsion of the belt 48 between 6 and 6 is set to a minimum, and the belt 48
8 is guided by pulleys 34, 40, 42, 44, 46, and 36 and moves smoothly.

〔effect〕

As described above, the present invention uses a flat belt, so there is no risk of it being cut due to friction with the pulleys, unlike wires. Furthermore, even if a clutch mechanism is provided between the vertical cursor and the flat belt and the clutch plate and the flat belt slide, the flat belt may slip against the clutch plate, causing the flat belt to break. do not have. Furthermore, since the pulleys facing the pair of upper and lower pulleys are inclined, twisting of the flat belt can be set to a minimum, and the flat belt can run smoothly between the pulleys.

[Brief explanation of drawings]

1 is an overall external view, FIG. 2 is a plan view, FIG. 3 is a sectional view, FIG. 4 is a sectional view, FIG. 5 is a sectional view, and FIG. 6 is a sectional view. 2... Drawing board, 4... Lead case holder, 6, 8... Vertical rail, 10.12... Vertical cursor, 14... Mounting plate, 1
6... Pivot support, 18... Ruler holder, 20... Shaft,
22...Long hole, 24...Horizontal ruler, 26.28...
Support shaft, 30.32... Fixture, 34.36... Belt pulley, 38... Support shaft, 40.42, 44, 46.
...belt pulley, 48...clutch plate, 50 belt fixing means,

Claims (2)

[Claims] (1) A pair of vertical rails 6, 8 arranged in parallel on both sides of the drawing board 2, and one belt pulley 34, 36 rotatably supported at one end of each of the vertical rails 6, 8. and a pair of the drawing boards 2 at each other end of the vertical rails 6 and 8.
Belt pulleys 40, 42, 44, and 46 are rotatably supported on axes substantially perpendicular to the plane, and the belt is arranged so that a pair of linear running portions are formed along each of the vertical rails 6 and 8. An endless flat belt 48 is stretched around the pulleys 34, 40, 42, 44, 46, and 36, and the pair of vertical rails of the flat belt 48 is movably attached to each of the pair of vertical rails 6 and 8. A parallel ruler device comprising: vertical cursors 10, 12 connected to linear running sections along rails 6, 8, respectively; and a horizontal ruler 24, both ends of which are connected to the vertical cursors 10, 12. (2) The rotation center axes of the belt pulleys 34 and 36 rotatably supported at one end of each of the vertical rails 6 and 8 are perpendicular to the longitudinal direction of the vertical rails 6 and 8, and are perpendicular to the two surfaces of the drawing board. 2. The parallel ruler device according to claim 1, wherein the parallel ruler device is inclined between vertical and horizontal with respect to the two surfaces of the drawing board within a perpendicular plane.