JPH0123320B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drafting device, and more particularly to a drafting device used in a numerically controlled automatic drafting machine.

A conventional drawing device will be explained with reference to FIG.
Reference numeral 2 denotes a holder tube fixed to the base plate 6 of the head 4, and an external tube body 8 is slidably inserted into the inner peripheral surface of the holder tube. A pin 10 protruding from the tube body 8
is a vertically elongated hole 12 bored in the upper part of the holder tube 2.
The tube body 8 is thereby prevented from rotating relative to the holder tube 2.
Reference numeral 14 denotes an inner tube, and a threaded portion formed on the lower outer circumferential surface of the inner tube is screwed into a threaded portion 16 formed on the inner circumferential surface of the lower end of the outer tube 8. A circumferential groove 18 is formed in the lower part of the inner tube body 14, and one end of the lifting arm 20 is fitted into the groove 18. The figure shows the inner tube in a raised state. The lifting arm 20 is connected to an output shaft of an lifting drive device 22 (solenoid) provided on the board of the head. Reference numeral 24 designates a core cartridge in the form of an elongated pipe that is slidably disposed within the inner tube body 14, and a lead core 26 is inserted into the core cartridge. Reference numeral 28 denotes a cap member, and a threaded portion formed on the inner circumferential surface of this cap member is screwed into a threaded portion on the upper portion of the inner tube body 14. The core cartridge 2
The head 24a of the cap member 28 is clamped by the horizontal end surface formed inside the cap member 28 and the upper end surface of the internal tube body 14, and this clamping pressure causes the lead cartridge 24 to close to the internal tube body. It is fixed to the upper end of 14. Reference numeral 30 designates a chuck release board placed on the upper end surface of the external pipe body 8, with a convex circle 30 in the center.
a is formed, and a hole is provided in the center of the release plate 30. 32 is the head 8 of the external tube body 8
This is a shaft that is slidably inserted into a vertical hole 34 transparently provided in a, the upper end of which is fixed to the release plate 30, and the lower end of the shaft 32 is placed on the upper end surface of the holder tube 2. It is placed. 36 is a cylindrical member, the upper part of which is fixed to the head 8a of the external tube body with a screw. A tapered tube 38 is fixed to the inner circumferential surface of a hole formed in the thick part of the cylindrical member 8 with a screw. The tapered tube 3
A spring 40 is compressed and disposed between the lower end surface of the release plate 8 and the upper surface of the release plate 30. 42 is a cylindrical body, and a threaded portion formed on the inner circumferential surface of the lower end is screwed into a threaded portion on the outer circumferential surface of the protrusion formed on the upper end of the cylindrical member 36. 44 is a round rod-shaped spring shaft;
The outer peripheral surface of this member can freely slide into a shaft hole 46 formed in the thick part of the external tube body 8, a shaft hole formed in the release plate 30, and a shaft hole 46 formed in the top wall of the cylindrical member 36. is fitted. A plurality of steel balls 48 are arranged between the inner circumferential tapered surface of the tapered tube 38 and the outer circumferential surface of the resilient shaft 44. The steel ball 48 comes into elastic contact with the outer circumferential surface of the elastic shaft 44 and the inner circumferential tapered surface of the tapered tube 38 due to the elastic force of the coil spring 50, and due to this elastic contact, the elastic shaft 44
is prevented from moving downward relative to the tapered tube 38, and is set to move in conjunction with the tapered tube 38 in the upward direction. The lower end of the steel ball 48 is opposed to the upper end of the convex circle 30a of the release plate 30. The tapered tube 38, steel ball 48, coil spring 50, and release plate 30 constitute a chuck mechanism. Reference numeral 52 denotes a coil spring compressed and arranged between a collar member 54 fixed to the resilient shaft 44 and the inner wall surface of the top wall of the cylinder 42, and the spring 52 rotates the resilient shaft 44 downward. is energized. 56 is a tailstock member, the upper end of which is fixed to the tip of the resilient shaft 44, and the tailstock member 5
The lower end of the lead cartridge 6 is in contact with the rear end of the lead core 26 in the lead cartridge 24. In the above-described configuration, when the driving device 22 is energized and the lifting arm 20 is lowered a predetermined distance, the inner tubular body 14 and the outer tubular body 8 are lowered a predetermined distance in the direction of the drawing board 58 in conjunction with this, The tip of the lead cartridge 24 is close to the drawing surface on the drawing board 58. When the outer tube 8 descends, the shaft 32 rises relative to it. At this time,
In conjunction with the shaft 32, the release plate 30 rises relative to the upper end surface of the outer tube 8, and the upper end of the convex circle 30a pushes up the steel ball 48, causing the steel ball 48 and the rebound shaft 4 to
Release the pressure contact state with 4. As a result, the resilient shaft 44 becomes free with respect to the tapered tube 38, and the tip of the core pushing member 56 presses the lead core 26 in the lead cartridge 24 downward due to the elasticity of the coil spring 52, causing the lead core 26 is the core cartridge 24
protrudes from the tip and comes into elastic contact with the drawing surface on the drawing board 58. This completes the pen-down operation. Next, the power supply to the drive device 22 is cut off, the arm 20 is raised a predetermined distance, and the inner tube 14 and the outer tube 8 interlocked therewith are raised.
is lowered relative to the outer tube body 8 and the cylindrical member 36, and the release plate 30 is lowered relative to the tapered tube 38. As a result, the pressing force on the steel ball 48 at the upper end of the convex circle 30a of the release plate 30 is released, and the steel ball 48 comes into elastic contact with the inner peripheral surface of the tapered tube 38 and the outer peripheral surface of the resilient shaft 44, and is resiliently The shaft 44 is brought into a state of interlocking upward with the tapered tube 38 at the initial stage of the rise of the arm 20, and the resilient shaft 44 is prevented from descending relative to the tapered tube 38. Further, as the arm 20 rises, the inner tube 14, the core cartridge 24, the outer tube 8, the cylindrical member 36, and the resilient shaft 44 rise. As the cartridge 24 rises, the internal lead core 26 rises in conjunction with the cartridge 24 due to frictional action with the inner peripheral surface of the cartridge 24, and the lead core 26 protruding from the tip of the cartridge 24 moves away from the drawing surface. Rising defection. Arm 2
0 stops when it rises to a predetermined position. This completes the pen-up operation. While performing the above pen-up and pen-down movements, press head 4.
is controlled to move in a predetermined direction within a plane parallel to the surface of the drawing board 58 by a numerical control device, and a predetermined pattern can be drawn on the drawing surface of the drawing board 58.

In the above-mentioned conventional drafting apparatus, in order to perform long-time drafting operations, it is necessary to use a longer lead cartridge and a longer lead lead. However, for example, if a core cartridge 20 mm longer than the core cartridge 24 shown in FIG.
mm, and the length of the elastic shaft 44 and coil spring 52 must also be increased by 20 mm. In the end, in order to lengthen the cartridge by 20 mm, the length of the entire device in the vertical direction must be increased by about 80 mm. It becomes something that must be done. That is, this results in an increase in the size of the drafting apparatus, which increases the weight of the head, which is undesirable for high-speed control of the head.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned defects and to make it possible to use a long lead cartridge without increasing the size of the drafting apparatus.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

Reference numeral 60 denotes a substrate of the head 62, on which a lifting device (solenoid) 64 is fixedly arranged. The head 62 is connected to a numerical control device (not shown) that controls its movement in a predetermined direction within a plane parallel to the surface of the drawing board 66 (the drawing surface). 68 is a lifting arm, and the arm 68 is connected to the operating shaft 70 of the solenoid 64.
Reference numeral 72 denotes a holder tube fitted into a hole formed in the substrate 60, and the holder tube 72 is fixed to the substrate 60 with a screw. An elevator tube 74 is slidably fitted into the inner peripheral surface of the holder tube 72. A rotation stop pin 76 is protruded from the elevator pipe 74, and the pin 76 is attached to the holder pipe 72.
is inserted into a vertically elongated hole 78 bored in the upper part of the
As a result, the elevator tube 74 is prevented from rotating relative to the holder tube 72. 80 is a tubular engagement member with a shaft hole provided in the center;
A circumferential groove 82 is formed on the outer peripheral surface of the groove.
2 is fitted with one end of the elevating arm 68. A thread is formed on the upper outer circumferential surface of the engaging member 80, and the thread is screwed into a threaded portion formed on the outer inner circumferential surface of the elevator tube 74. FIG. 2 shows a state in which the elevating arm 68 is in a standby position at the highest raised position. Reference numeral 84 denotes a tube whose lower outer circumferential surface is screwed onto the internal inner circumferential surface of the elevator tube 74 . The engaging member 80, the elevator pipe 74, and the tube body 84 constitute a tubular moving body 86 as a whole. Reference numeral 88 denotes a transmission tube that is fitted into the outer peripheral surface of the tubular body 84 so as to be able to rise and fall freely, and the lower end surface of the bottom portion thereof is placed in resilient contact with the upper end surface of the holder tube 72. Said tube body 8
A vertical groove 90 is formed in the head 84a of the transmission pipe 88, and a vertically elongated hole 92 is formed in the upper part of the transmission pipe 88. The upper pipe wall of the transmission pipe 88 is located within the longitudinal groove 90, and the head 84 is located within the longitudinal hole 92.
a is located. Reference numeral 94 denotes a chuck release board placed on the upper end surface of the head 84a, and a protruding tube part 94a is formed in the center. The release plate 94 is urged downward by the elasticity of the coil spring 96. The upper end of the transmission pipe 88 is in contact with the lower horizontal surface of the release plate 94 . Reference numeral 98 designates an elongated pipe-shaped core cartridge whose outer circumferential surface is fitted into the shaft hole of the engaging member 80 and which is disposed within the movable body 86, and the outer circumferential conical surface is pressurized. The chuck member 100, which reduces in diameter when the chuck member 100 is turned, is fitted.
Reference numeral 102 denotes a tightening member that is slidably fitted onto the outer circumferential surface of the cartridge 98, and threads are formed on the outer circumferential surface of the tightening member. The screw of the tightening member 102 is screwed into the screw formed on the upper inner peripheral surface of the engaging member 80, and the tapered surface formed on the lower end surface of the tightening member 102 is connected to the chuck member 1.
It is crimped onto the conical surface of 00. As a result, the inner circumferential surface of the chuck member 100 is pressed against the outer circumferential surface of the core cartridge 98, and the chuck member 100 is pressed against the outer circumferential surface of the core cartridge 98.
0, the lower end surface is pressed against the horizontal surface of the engaging member 80, and the portion near the tip of the core cartridge 98 is pressed against the horizontal surface of the engaging member 80.
Fixed to 0. 104 is a cylindrical body, and a threaded portion formed on the lower inner circumferential surface of the cylindrical body is connected to the head 8.
It is screwed into a threaded portion formed on the outer peripheral surface of 4a. 106 is a tapered tube screwed onto a threaded portion formed on the upper inner circumferential surface of the cylindrical body 104, and the inner circumferential surface of this tube has a tapered surface 1 whose diameter increases upward.
08 is formed. 110 is Natsu, 112
is a cap member screwed onto the inner peripheral surface of the upper part of the tubular body 104, a shaft hole is provided in the center of the cap member, and a threaded portion formed on the inner peripheral surface of the shaft hole has a tubular shape. The lower part of member 114 is threaded. A lower portion of a tubular member 116 is screwed onto the upper portion of the tubular member 114 . Reference numeral 118 denotes a pipe-shaped resilient shaft disposed in the tubular member 114 so as to be able to rise and fall freely, and its lower outer circumferential surface is connected to the inner circumferential surface of the shaft hole of the release plate 94 and the upper inner circumference of the tubular body 84. It is slidably fitted to the surface. The inner diameter of the resilient shaft 118 is set to be slightly larger than the maximum outer diameter of the core cartridge 98. Tapered surface 10 of the tapered pipe 106
8 and the outer peripheral surface of the resilient shaft 118, a plurality of steel balls 120 are disposed between the resilient shaft 118 and the resilient shaft 118. It is in elastic contact with the outer peripheral surface of 118. The upper end surface of the protruding pipe portion 94a is connected to the steel ball 120.
is facing. Reference numeral 124 denotes a cylindrical member screwed onto the upper inner circumferential surface of the resilient shaft 118, and the outer circumferential surface of the member 124 is slidably fitted into the inner circumferential surface of the tubular member 114. A rear end portion of a needle-shaped tailing member 126 is press-fitted into an elongated vertical hole bored in the small diameter portion of the cylindrical member 124, and is fixed with an adhesive. The tip end surface of the tailing member 126 faces the rear end surface of the lead core 128 in the lead cartridge 98. 130 is a vertically elongated hole transparently provided in the tubular member 114, into which the columnar member 1 is inserted.
A pin 132 protruding from 24 is slidably inserted. A coil spring 136 is compressed and disposed between the upper end surface of the cylindrical member 124 and the lower surface of the lid 134 screwed onto the upper end of the tubular member 116. As is clear from the above description of the configuration, even if the core cartridge 98 is used, which is longer by X than the conventional core cartridge 24, the overall height of the present device can be set to be the same as that of the conventional device. .

Next, the operation of this embodiment will be explained.

When the coil of the lifting drive device (solenoid) 64 is energized from the controller (not shown),
The actuating shaft 70 is lowered by electromagnetic force until the stopper plate 136 fixed to the actuating shaft 70 comes into contact with the stopper surface 138, whereby the lifting arm 6
8 descends. When the lifting arm 68 descends, the movable body 86, the cylindrical body 104, the tubular members 114, 116, and the core cartridge 98 descend by a predetermined distance in the direction of the drawing board 66, and the tip of the core cartridge 98 moves downward by a predetermined distance. It is closely opposed to the drawing paper surface on the drawing board 66. At this time, since the transmission pipe 88 and the release plate 94 in contact with the transmission pipe 88 are held in a fixed position, the cylindrical body 104
When the cylinder body 104 descends, the steel ball 120 comes into contact with the upper end of the projecting tube part 94a of the release plate 94 at a stage slightly before the lowest position. Resisting the elasticity of the spring 122, the elastic axis 11 of the steel ball 120 rises relative to the tapered surface 108 of the tapered tube 106.
The state of elastic contact with the outer peripheral surface of 8 is released. As a result, the resilient shaft 118 becomes free with respect to the tapered tube 106, and the tip of the tail pushing member 126 comes into elastic contact with the rear end of the lead core 128 in the lead cartridge 98 due to the elasticity of the coil spring 136. A lead lead or consumable writing lead 128 is attached to a lead pushing member 126.
The core cartridge 98 protrudes from the tip due to the pressing force from the core cartridge 98 and comes into elastic contact with the surface of the drawing paper. As the core 128 wears down due to drafting work, the resilient shaft 118
4, but its distal end surface is not collided with the rear end of the lead cartridge 98. Next, when the power to the solenoid 64 is cut off according to a command from the controller, the solenoid 64 is de-energized.
The operating shaft 70 of No. 4 is raised by the elasticity of a spring (not shown) until the stopper plate 136 is locked with the stopper surface 142. As the operating shaft 70 rises, the arm 68 also rises, and the elevating body 86,
While the cylindrical body 104, tapered tube 108 and core cartridge 98 rise, the transmission tube 88 and release plate 94
remains in place. At the initial stage of the rise of the arm 68, the upper end of the protruding tube portion 94a of the release plate 94 is released from the elastic pushing up state against the steel ball 120, and the steel ball 120 is pushed up against the tapered tube 108 by the elasticity of the coil spring 122. It comes into elastic contact with the outer circumferential surface of the firing shaft 118, and due to this elastic contact force, the resilient shaft 118 is gripped by the tapered tube 106 and is prevented from moving downward relative thereto. As a result, the resilient shaft 118 rises in conjunction with the rise of the elevating body 86 and the cylindrical body 104, and the lead core 128 protruding from the tip of the lead cartridge 98 separates from the drawing surface. As mentioned above, the lead core 128 is
is brought into elastic contact with or away from the surface of the drawing paper, and the head 62 is numerically controlled in a predetermined direction within a plane parallel to the surface of the drawing board 66 by a numerical control device.
A predetermined pattern is drawn on the surface of the drawing paper 6. Incidentally, the present device can also be applied to a numerically controlled automatic drawing machine using a rotating drum instead of the drawing board 66. In addition, when carrying out the present invention, the elastic shaft 1
The chuck mechanism that grips the resilient shaft 118 toward the cylindrical body 104 against movement in the direction of the drawing board 66 of 18 can have various configurations. The configuration is not particularly limited. Further, even if the drawing board 66 is set perpendicular to the floor surface and the entire device is configured horizontally, exactly the same effects as described above can be obtained.

As described above, the present invention provides the rear part of the tailstock member,
Since it is connected to the rear part of the spring shaft and is structured so that the spring shaft can descend along the core cartridge, it is possible to use a longer cartridge than before without increasing the height of the entire device. Moreover, if a cartridge of the same size as the conventional one is used, there is an effect that the entire apparatus can be constructed extremely compactly.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the prior art, FIG. 2 is a sectional view showing a preferred embodiment of the present invention, and FIG.
FIG. 4 is a front view of the component, FIG. 5 is a front view of the component, and FIG. 6 is a sectional plan view of the component. 4...head, 6...substrate, 20...lifting arm, 22...lifting drive device. 24... Core cartridge, 26... Lead core, 30... Chuck release board,
38...Tapered tube, 44...Bulp shaft, 48...
Steel ball, 56...Coiling member, 58...Drawing board, 60
...Substrate, 62...Head, 64...Elevating drive device, 68...Elevating arm, 72...Holder tube,
80... Engaging member, 82... Circumferential groove, 84... Pipe body, 86... Moving body, 88... Transmission pipe, 90...
Vertical groove, 94...release plate, 96...coil spring. 9
8... Core cartridge, 104... Cylindrical body, 106
...Tapered pipe, 108 ...Tapered surface, 114
... Tubular member, 116 ... Tubular member, 118 ...
Resilient shaft, 120... steel ball, 122... spring, 126... tailstock member, 128... lead core, 1
36...stopper board.

Claims (1)

[Claims] 1. Move the substrate 60 of the head 62, which is controlled to move in a predetermined direction relative to the drawing surface at a fixed interval with respect to the drawing surface, in a direction toward and away from the drawing surface. A tubular moving body 86 is freely attached, the moving body 86 is connected to the drive device 64 provided in the head 62, and a portion near the tip of a pipe-shaped core cartridge 98 is locked near the tip of the moving body 86. Then, a hollow resilient shaft 118 is fitted into the movable body 86 so as to be movable along the movable body 86, and the resilient shaft 118 is biased in the direction of the drawing surface. A needle-shaped tailstock member 126 is loosely fitted therein, and the rear end of the corestock member 126 is connected to a portion near the rear end of the resilient shaft 118.
The tip of the writing lead 1 in the lead cartridge 98
28, the inner diameter of the elastic shaft 118 is made larger than the outer diameter of the core cartridge 98, and a , a chuck mechanism for preventing relative movement of the resilient shaft 118 in the direction toward the drawing surface with respect to the moving body 86;
2. A drafting apparatus comprising: means for releasing the chuck mechanism and releasing the resilient shaft 118 with respect to the movable body 86 when the chuck moves in a direction toward the drawing surface.