JPH0120079B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a drawing machine that maintains the parallelism of a straightedge at any point on a drawing board by vertical rails and horizontal rails that are combined orthogonally to each other. ,
This invention relates to a floating support device for a drafting head which supports a drafting head which is attached to a straightedge guide and operates the straightedge in parallel or rotational movement at a position floating above the drafting board together with the straightedge and in a stationary state.

B. Prior Art In general, in drafting work using a drafting machine, when the drafting paper fixed to the drafting board is replaced or moved, the paper face plate and straightedge at the bottom of the drafting head are placed on the drafting paper. In order to avoid staining the drawing paper when sliding on the drawing board, it is desirable to be able to support the drawing head together with the straightedge at a position floating above the drawing board.

Furthermore, when returning the drafting head and straightedge from the floating position to their original positions, it is desirable that the operation for releasing the floating support can be performed easily.

By the way, as a floating support device for a drafting head, a device using a link device constituted by a flat link piece has been proposed, for example in Japanese Patent Laid-Open No. 10025/1983.

C. Problems to be Solved by the Invention However, in this conventional floating support device for a drafting head, the frictional force between the link pieces to support the weight of the drafting head is not generated as expected, and as a result, the drafting head is It has the disadvantage that it is difficult to support it in a floating position.

Further, the above-mentioned conventional floating support device for a drafting head has the disadvantage that it has an extremely large number of parts, has a complicated structure, and is prone to failure.

Therefore, the present invention has been proposed to solve the problems of the above-mentioned conventional floating support device for a drafting head, and has a small number of parts.
It is an object of the present invention to provide a novel drafting head support device that can reliably perform floating support and release operations for the drafting head.

D Means for Solving the Problems In order to achieve the above object, the present invention includes a carriage disposed on one side of the drawing board and movable along the longitudinal direction of the rail, and a carriage connected to the carriage. a connecting bracket, an opening/closing hinge having one end rotatably connected to the connecting bracket and a first pivot in a direction in which it floats from the drawing board, and the other end of the opening/closing hinge connecting the second pivot to the connecting bracket; a pivoting hinge rotatably connected in a direction floating from the drawing board through the drawing board; a drafting head connected to the other end of the pivoting hinge; and an end of the pivoting hinge and an opening/closing hinge. and a reaction force that is adjustable at each end and prevents rotation of the drafting head when it is lifted from the drafting board via the second pivot shaft, and balances the falling moment of the drafting head that is supported by floating. a locking mechanism that applies a moment; a fixed support that is formed as a part of the connection bracket and protrudes toward the rotating hinge; A long side surface on which one end of the pivot hinge is placed, and valleys formed by this long side surface are formed at constant angles around the circumference and are bored in the shaft guide plates disposed on both sides. a rotating holder supported in a loosely fitting groove; a hooking member biased by an elastic member and disposed to always fit in the valley; and an elastic force balanced with the weight of the drafting head. A click mechanism includes an elastic member that urges the rotary holder so that the rotary holder rotates at fixed angles, and the drafting head is supported in a floating position by the cooperation of the lock mechanism and the click mechanism. It is characterized by this.

E Effect According to the present invention, when the drawing head is lifted up from the drawing board, the locking mechanism disposed between the opening/closing hinge and the rotating hinge and the rotating holder constituting the click mechanism that cooperates with this locking mechanism are activated. The drawing head is supported at the floating position by the elastic force of the elastic member urging the drawing head.

F Embodiment Hereinafter, preferred embodiments of the present invention will be described in FIGS. 1 to 8.
This will be explained in detail with reference to the drawings.

As shown in FIG. 1, a drafting head 2 formed in a size that can be held in the hand is attached to the drafting head floating support device 1 described in this embodiment. A straight ruler 4 is attached via a ruler attachment plate 3. The upper side of the drafting head 2 is a knob 5,
The knob 5 is configured to rotate integrally with the rotating main shaft 7 inserted into the moving shaft 6 of the drafting head 2 and the ruler mounting plate 3. The moving shaft 6 is non-rotatable, and two pivot shafts are attached to a rotating hinge 9 integrally formed with a drafting head holder 8 which is arranged in an annular shape surrounding the moving shaft 6. 10 so as to be able to freely swing slightly, and is movable to any point on the drawing board.

The pivot hinge 9 is connected to the drafting head side 11a of the opening/closing hinge 11 via a second pivot 12 on one side (the left end in FIG. 1). The hinge 9 has an arm portion 9c from the drafting head holder portion 8 to the pivot shaft 12, and the pivot shaft 12 is connected to the boss portion 9b of the hinge portion 9.
It is inserted into an insertion hole (not shown) drilled in the. The lower end of this boss portion 9b is an engagement block 9e, which is rectangular so as to engage with a long side surface 30b of a rotary holder 23, which will be described later.
Further, one side surface of this boss portion 9b is formed vertically and serves as a stop surface 9f for raising the rotation hinge 9, as will be described later.

On the other hand, one end of the opening/closing hinge 11 is connected to the boss portion 9b formed at one end of the pivot hinge 9 via the second pivot 12 as described above, and the other end is connected to the boss portion 9b formed at one end of the pivot hinge 9. The connecting bracket 14 is connected to one end of a connecting bracket 14 which is arranged to protrude from a pedestal 13a provided on the vertical carriage 13 via a screw 15. One end of the opening/closing hinge 9 is formed with a concave surface 11c for allowing free relative rotation of the boss portion 9d of the pivot hinge 9. Furthermore, a part of this concave surface 11c is formed as an erecting stop surface 11d that faces the erecting stop surface 9f formed on the rotation hinge 9.
This erecting stop surface 11d engages with an erecting stop surface 9f formed on the pivot hinge 9, and is adapted to support the weight of the drafting head 2 when the drafting head 2 is erected.

Note that the pivot hinge 9 allows minute pivoting with respect to the opening/closing hinge 11 when the drafting head 2 and straightedge 4 are brought into close contact with the drafting board or raised from the drafting board. It is for the purpose of On the other hand, the opening/closing hinge 11 is connected to the connecting bracket 14 when the drafting head 2 and straightedge 4 are inverted with respect to the drafting board (the drafting head 2 is rotated counterclockwise in FIG. 1). This is for making large pivot operations.

From the end of the connecting bracket 14, which is connected to the other end of the opening/closing hinge 11 via the first pivot 15, there is a fixed support base 16, as shown in FIGS. 1 and 6. is installed protrudingly. The fixed support base 16 has a substantially rectangular parallelepiped shape, and two spring assembly grooves 17 are formed in circles on both sides of the upper surface. Moreover, this fixed support stand 16 has this support stand 1
A shaft guide 18 and a pin guide 19 are fixed so as to receive the pin 6 from below.

As shown in FIG. 5, the shaft guide 18 is composed of a rectangular bottom plate 20 and two shaft guide plates 21, 21 formed upright from both sides of the bottom plate 20. Furthermore, these two shaft guide plates 21, 2
1 is provided with substantially elliptical shaft guide holes 22, 22, respectively. These shaft guide holes 2
2 and 22 are formed to be convex from the front end to the rear end of the shaft guide 18 and upward. And these shaft guide holes 22, 22
A rotating shaft 24 of a rotating holder 23 is inserted through the rotating shaft 24 of the rotating holder 23. Therefore, this rotary holder 23 is supported in a loosely fitted state on the two shaft guide plates 21, 21.

Further, as shown in FIG. 4, the pin guide 19 is composed of a flat plate 25 and two pin guide plates 26, 26 rising from both sides of the flat plate 25. Further, horizontally located elliptical pin guide holes 27, 27 are formed in the upper end sides of these pin guide plates 26, 26, respectively, into which a hooking member 28 that engages with the rotary holder 23 is loosely fitted. It is designed to support the situation.

The bottom plate 20 of the shaft guide 18 is located on the top surface of the bottom plate 25 of the pin guide 19 and on the bottom surface of the fixed support base 16. The plates 21, 21 are designed to protrude largely in the direction opposite to the fixed support base 16 (towards the drafting head 2).

The rotary holder 23 supported by the shaft guide 18 is a columnar roller having six trapezoidal peaks 29, and these trapezoidal peaks 29 are formed on the circumferential surface of the rotary holder 23 at equal intervals. There is. Each trapezoidal peak 29 is formed into a right-angled trapezoid, and six valleys 30 are formed by adjacent trapezoidal peaks 29.
is formed. These troughs 30 are formed by a short side surface 30a and a long side surface 30b of the right-angled trapezoidal trapezoidal peak portion 29.
The short side surface 30a and the long side surface 30 are formed by
The angle with b is approximately 90°. By inserting the engaging pin 28 supported by the shaft guide 18 into one of the troughs 30, the rotary holder 23 can be rotated at fixed angle intervals.

Furthermore, the engaging pin 28 inserted into the trough 30 of the rotary holder 23 is moved in the direction of the rotary holder 23 by two compression coil springs 31 assembled into the spring assembly groove 17 formed in the fixed support base 16. The compression coil spring 31, the engaging pin 28, and the rotary holder 23 constitute a click mechanism. That is, as shown in FIG. 7, the engaging pin 28 is constantly urged in the direction of the rotating holder 23 (in the direction of the drafting head 2) by the elastic force of the compression coil spring 31, and is dropped into the trough 30 of the rotating holder 23. It is possible. When the engaging pin 28 is dropped into the first trough 30, the long side surface 30b of the second trough 30 shifted in the clockwise direction is in a horizontal state, and this long side surface 30b
The locking block 9e of the pivot hinge 9 can now be placed on the locking block 9e. Further, when the engaging block 9e of the rotating hinge 9 is placed on the horizontal long side surface 30b, the weight of the drafting head 2 is loaded onto the rotating holder 23, and this rotating holder 23 rotates clockwise in FIG. This causes the engaging pin 28 to be pushed out from within the trough 30 toward the vertical carriage 13. However, the engagement pin 28 is strongly urged in the direction of the drawing head 2 by the compression coil spring 31, and the short side surface 30a of the valley portion 30
and maintains the state of engagement with the long side surface 30b.

However, when the drafting worker presses the knob 5 of the drafting head 2 against the elastic force of the compression coil spring 31, the engagement pin 28 is pushed out of the valley 30. Then, the valley part 30 of this engaging pin 28
When the engagement is released, the rotary holder 23 rotates clockwise in FIG. 7. As a result, the engaging block 9e of the rotating hinge 9 is released downward from the rotating holder 23 and returns to the state shown in FIG. That is, the paper surface plate 2a of the drafting head 2 and the lower surface of the straight edge 4 are in close contact with the drafting board.

Incidentally, as shown in FIG. 6, a spring cover 32 having a U-shaped cross section is fixed to the upper surface portion 16a of the fixed support base 16 on which the compression coil spring 31 constituting the above-mentioned click mechanism is disposed. At the same time, a rotary holder return leaf spring 33 is fixed to the upper surface 32a of the spring cover 32.

The spring cover 32 is provided with two hanging pieces 34 that are formed to hang down from both sides of the spring cover 32 , and are arranged so as to contact both sides of the compression coil spring 31 .
1 prevents it from coming off from the spring assembly groove 17.

On the other hand, the rotary holder return plate spring 33 is fixed to the upper surface of the spring cover 32 at the base end side as described above, and has a free end 33a at the tip end.
The rotary holder 23 comes into contact with the top surface 29a of the trapezoidal ridge 29 of the rotary holder 23, and is supported by being loosely fitted into the guide holes 22, 22 of the shaft guide 18, so that the rotary holder 23 comes to rest at the lowest position. being done.

Furthermore, in this embodiment, as shown in FIG.
A lock mechanism 35 is provided for floating and supporting the drafting head 2 in a horizontal state. Note that this FIG. 8 is a sectional view at a different position from the positions shown in FIGS. 1 and 7.

This locking mechanism 35 is formed to protrude slightly from the boss portion 9d of the pivot hinge 9 toward the vertical carriage side (left side in FIG. 8), and includes a floating lock protrusion 36 and a rotation prevention stopper 37. It is configured.

The floating lock projection 36 is located slightly below the boss portion 9d of the pivot hinge 9, and further projects from the boss portion 9d toward the vertical carriage 13 side. And this floating lock protrusion 3
6, a contact screw 38 for adjusting the contact position between the rotating element stopper 37 and this floating lock projection 36 is arranged in a direction perpendicular to the floating lock projection 36. . This contact screw 3
8, by adjusting the amount of protrusion, the tip (not shown) of the straightedge 4 attached to the drafting head 2 supported in the floating position does not come into contact with the drawing board due to the deflection of the straightedge 4. It is intended to do so.

On the other hand, the rotary element stopper 37 includes a rib 39 extending in the longitudinal direction of the opening/closing hinge 11 inside the opening/closing hinge 11, and a hexagonal bolt 4 screwed onto the rib 39 and having a lower head 40 protruding.
It is composed of 1. As shown in FIG. 8, the head 40 of this hexagonal bolt 41
8, the weight of the drafting head 2 and straightedge 4 and the falling moment about the second pivot 12 are canceled by the reaction force moment caused by the rigidity of the opening/closing hinge 11. It is. Further, the rotation of the drafting head 2 is prevented by the lock mechanism 35, and the rotation of the drafting head 2 is prevented by the lock mechanism 35.
is prevented from falling onto the drawing board by the rotary holder 23.

The operation of the floating support device 1 for the drafting head 2 will be explained below.

First, when the drawing head 2 is lifted from the drawing board by gripping the knob 5 in the state shown in FIG. The upper edge portion 9g of the arm protrusion further protrudes in this direction and comes into contact with the short side surface 30a of the rotary holder 23. Due to the abutment between the upper edge 9g of the arm tip and the short side surface 30a of the rotary holder 23, the rotary holder 23, which is loosely fitted and supported by the shaft guide holes 22, 22, is moved by the elasticity of the rotary holder return spring 33. It is rotated around the engagement pin 28 while resisting the force. This avoids mutual interference between the upper edge 9g of the arm end of the rotary hinge 9 and the rotary holder 23, and the rotary holder 23 returns to its lowest position by the action of the rotary holder return spring 33. Then, the engagement block 9e of the rotation hinge 9 is placed on one long side surface 30b of the rotation holder 23 in this return position, as shown in FIG.

In the state shown in FIG. 7, the lock mechanism 35 shown in FIG. 8 locks between the rotating hinge 9 and the opening/closing hinge 11, so that
Rotation of the pivot hinge 9 about the pivot shaft 12 is prevented, and the weight of the drafting head 2 is supported by two compression coil springs 31.

Furthermore, when returning the drafting head 2 from the state shown in FIG. 7 to the state shown in FIG. Press downward against the elastic force of 31. Then, the rotation holder 23
attempts to rotate clockwise in FIG. 7 together with the rotating shaft 24 at the lowest end position of the shaft guide hole 22, pushing the engagement pin 28 toward the vertical drill 13 (to the left in FIG. 7). By this,
Engagement block 9e of rotation hinge 9 and rotation holder 2
At the same time that the engagement with the long side surface 30b of 3 is released, the lock mechanism 35 is also released. As a result, the drawing head 2 comes into close contact with the drawing board.

During this time, the engaging pin 28 is inserted into the next trough 30 by the elastic force of the compression coil spring 31 while slidingly contacting the trapezoidal peak 29 that is rising while rotating. At this time, the sound of the engagement pin 28 colliding with the short side surface 30a and the long side surface 30b is as follows.
A "click" sound that does not cause discomfort to the drafting worker is produced, and this sound serves as a notification sound to notify that the release operation from the floating support state has been reliably performed.

G Effect of the Invention As described above, according to the present invention, since it is not constructed using link pieces unlike the conventional technology,
Because it has a relatively small number of parts and has a structure that balances the spring force and the weight of the drafting head,
The drafting head can be reliably supported floatingly.

Furthermore, the floating supported state of the drawing head can be easily released by simply pressing the drawing head in a direction perpendicular to the drawing board.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a floating support device for a drafting head according to an embodiment of the present invention, FIG. 2 is a plan view of the floating support device, FIG. 3 is a cross-sectional view taken along the - line in FIG. 2, and FIG. 5 is a perspective view of the shaft guide, FIG. 6 is an exploded perspective view of the floating support device, FIG. 7 is a sectional view showing the operating state of the floating support device, and FIG. 8 is a perspective view of the pin guide. FIG. 3 is a cross-sectional view of the locking mechanism. DESCRIPTION OF SYMBOLS 1... Drafting head floating support device, 2... Drafting head, 9... Rotating hinge, 9e... Engagement block, 10... Pivot shaft, 11... Opening/closing hinge,
12...Second axis, 13...Vertical carriage, 1
4... Connection bracket, 15... First pivot,
16... Fixed support base, 18... Shaft guide, 22...
...Axis guide hole, 23... Rotating holder, 28... Engagement pin, 30... Valley, 30b... Long side surface, 31
... Compression coil spring, 33 ... Rotating holder return spring, 35 ... Lock mechanism, 42 ... Click mechanism.

Claims (1)

[Scope of Claims] 1. A carriage disposed on one side of the drawing board and movable along the longitudinal direction of the rail, a connecting bracket connected to the carriage, and a connecting bracket having one end connected to the connecting bracket. an opening/closing hinge rotatably connected to the other end of the opening/closing hinge in a direction of floating from the drawing board via a first pivot; and a hinge rotatable in a direction of floating from the drawing board via the other end of the opening/closing hinge and a second pivot; a vertically connected pivot hinge; a drafting head connected to the other end of the pivot hinge; and a drafting head that is adjustable at an end of the pivot hinge and an end of the opening/closing hinge, respectively. a locking mechanism that prevents rotation of the drafting head when it is lifted from the drafting board via a second pivot and provides a reaction force moment that is balanced with the falling moment of the drafting head that is floated and supported; and the connecting bracket. a fixed support that is formed as a part of the rotating hinge and is formed to protrude toward the rotating hinge, and a length that is rotatably arranged in the protruding direction of the fixed support and on which one end of the rotating hinge is placed. A rotary holder in which valleys formed by side surfaces and long side surfaces are formed at regular angles around the periphery, and are supported by loose fitting grooves drilled in shaft guide plates disposed on both sides. an engaging member which is biased by an elastic member and disposed so as to be always fitted into the trough; and an engaging member having an elastic force balanced with the weight of the drafting head and adapted to rotate the rotary holder at regular angle intervals. A floating support device for a drafting head, comprising: a click mechanism comprising an elastic member that biases a rotary holder; and a drafting head floating support device that supports the drafting head at a floating position through cooperation between the lock mechanism and the click mechanism.