JPH0123837Y2 - - 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.

The main purpose of the present invention is to provide a drafting device that can maintain a constant core pressure on the drawing surface of a consumable writing core such as a lead lead.

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

Reference numeral 1 designates a board of the head 2, on which a lifting drive device (solenoid) 4 is fixedly arranged. The head 2 is connected to a numerical control device (not shown) that controls movement in a predetermined direction within a plane parallel to the drawing board 6, that is, the drawing surface 6. 8 is a lifting arm, and this arm 8 is connected to the solenoid 4.
It is connected to the operating shaft 10 of. 12 is the substrate 1
It is a holder tube fitted into a transparent hole in the
The holder tube 12 is fixed to the substrate 1 with screws. An elevator tube 14 is slidably fitted into the inner peripheral surface of the holder tube 12. A rotation stop pin 16 is protruded from the elevator tube 14, and the pin 16 is inserted into a vertical hole 18 bored in the upper part of the holder tube 12, so that the elevator tube 14 Rotation relative to the holder tube 12 is prevented. Reference numeral 20 denotes a tubular engaging member with a shaft hole provided in the center thereof, and a circumferential groove 22 is formed on the outer circumferential surface of the engaging member, and one end of the lifting arm 8 is fitted into the groove 22. There is. A thread is formed on the upper outer circumferential surface of the engaging member 20, and the thread is screwed into a threaded portion formed on the lower inner circumferential surface of the elevator tube 14.
The drawing shows a state in which the lifting arm 8 is located at the highest position. Reference numeral 24 denotes a tube whose lower outer circumferential surface is screwed onto the upper inner circumferential surface of the elevator tube 14 . The engaging member 20, the elevator pipe 14, and the tubular body 24 constitute a tubular elevator body 26 as a whole. Reference numeral 28 denotes a transmission tube that is fitted into the outer circumferential surface of the tubular body 24 so as to be able to rise and fall freely, and the lower end surface of the bottom portion thereof is placed and abutted on the upper end surface of the holder tube 12. A vertical groove 30 is formed in the head 24a of the tube body 24, and a vertically elongated hole 3 is formed in the upper part of the transmission tube 28.
2 is formed. The upper pipe wall of the transmission pipe 28 is located within the vertical groove 30, and the head 24a is located within the vertically elongated hole 32. Reference numeral 34 designates a chuck release board placed on the upper end surface of the head 24a, and has a protruding tube part 34a formed in the center. The release plate 34 is urged downward by the elasticity of the coil spring 36. The upper end of the transmission pipe 28 is in contact with the lower horizontal surface of the release plate 34 . Reference numeral 38 designates an elongated pipe-shaped core cartridge whose outer circumferential surface is fitted into the shaft hole of the engaging member 20 and which is disposed within the elevating body 26. A chuck member 40 is fitted onto the outer circumferential surface of the core cartridge 38. are doing. Chuck member 40
is configured such that its diameter decreases when the conical surface on its outer periphery is pressurized. Reference numeral 42 denotes a tightening member that is slidably fitted onto the outer circumferential surface of the cartridge 38, and a thread is formed on the outer circumferential surface of this tightening member. The screw of the tightening member 42 is screwed into the screw formed on the upper inner peripheral surface of the engaging member 20, and the conical surface formed on the lower end surface of the tightening member 42 is connected to the conical surface of the chuck member 40. It is crimped. As a result, the inner circumferential surface of the chuck member 40 is attached to the cartridge 3.
At the same time, the lower end surface of the chuck member 40 is pressed to the horizontal surface of the engagement member 20,
The portion near the tip of the cartridge 38 is connected to the engaging member 2
Fixed to 0. 44 is a cylindrical body, and a threaded portion formed on the lower inner circumferential surface of the cylindrical body is connected to the head 24.
It is screwed into a threaded portion formed on the outer peripheral surface of a.
A tapered tube 46 is screwed onto a threaded portion formed on the upper inner circumferential surface of the cylindrical body 44, and a tapered surface 48 whose diameter increases upward is formed on the inner circumferential surface of this tube. 50 is a nut, 52 is a cap member screwed onto the upper part of the cylindrical body 44, a shaft hole is provided in the center of the cap member, and a threaded portion formed on the inner circumferential surface of the shaft hole is provided with a threaded portion. , the lower part of the lower tubular member 54 is screwed. In the upper part of the lower tubular member 54,
The lower part of the upper tubular member 56 is screwed. The upper tubular member 56 and the lower tubular member 54 constitute one tubular member as a whole. Reference numeral 58 denotes a pipe-shaped resilient shaft disposed in the tubular member 54 so as to be able to rise and fall freely, and the lower outer circumferential surface of this is disposed in the above-mentioned release plate 3.
It is slidably fitted into the inner circumferential surface of the shaft hole of No. 4 and the upper inner circumferential surface of the tube body 24. The inner diameter of the resilient shaft 58 is set to be slightly larger than the maximum outer diameter of the core cartridge 38. A plurality of steel balls 60 are arranged between the tapered surface 48 of the tapered pipe 46 and the outer peripheral surface of the resilient shaft 58, and the steel balls 60 are pushed against the tapered surface by the resilient force of the spring 62. 48 and is in elastic contact with the outer peripheral surface of the resilient shaft 58. The upper end surface of the projecting tube portion 34a faces the steel ball 60. Reference numeral 64 denotes a cylindrical member screwed onto the upper inner circumferential surface of the resilient shaft 58, and the outer circumferential surface of the member 64 is slidably fitted into the inner circumferential surface of the tubular member 54. The upper part of a needle-shaped tailing member 66 is press-fitted into an elongated vertical hole bored in the small diameter portion of the cylindrical member 64, and is fixed with an adhesive. The lower end surface of the core pushing member 66 is connected to the core cartridge 3.
It faces the rear end of the writing lead 68 in 8. 70
is a vertically elongated hole formed through the tubular member 54, into which a pin 72 protruding from the cylindrical member 64 is slidably inserted. The pin 72 and the vertical hole 7
0 constitutes a means for externally displaying the state of wear of the writing lead 68, and the pin 72 constitutes a member that is displaced in conjunction with the core pushing member 66.
Note that the means can adopt various configurations other than the illustrated configuration, and the implementation of the present invention is not particularly limited to the illustrated configuration. A coil spring 76 is compressed and disposed between the upper end surface of the cylindrical member 64 and the lower surface of the lid 74 screwed onto the upper end of the tubular member 56. Reference numeral 80 denotes a spring pressing member, which is disposed between the lid 74 and the upper end of the spring 76. Reference numeral 82 denotes a vertically elongated hole formed transparently in the side wall of the tubular member 56 along its longitudinal direction, into which a pin-shaped member 84 protruding from the presser member 80 is slidably inserted. One end of the pin-like member 84 protrudes outside the tubular member 56 so that it can be operated from the outside. 86 is a plurality of index recesses formed at predetermined intervals in the vertical hole 82;
When the pin-like member 84 is inserted into one of the index recesses 86, the pin-like member 84 is locked and held in the index recess 86, thereby causing the presser member 80 to hold the selected index. It is configured to be locked at a position corresponding to the recess 86.

Next, the operation of this embodiment will be explained.

When the coil of the lifting drive device (solenoid) 4 is energized by a command from a controller (not shown), a stopper plate 90 fixed to the operating shaft 10
The operating shaft 10 is lowered by electromagnetic force until it comes into contact with the stopper surface 92, and thereby the lifting arm 8 is lowered. When the elevating arm 8 descends, the elevating body 26, the cylindrical body 44, and the tubular member 5 move in conjunction with this.
4, 56 and the lead cartridge 38 are lowered a predetermined distance in the direction of the drawing board 6, and the tip of the lead cartridge 38 is closely opposed to the drawing surface on the drawing board 6. At this time, the transmission pipe 28 and the release plate 34 in contact with the transmission pipe 28 are held in a fixed position, so when the cylinder 44 descends, the steel ball 60 is released into the protrusion of the release plate 34 at a stage slightly before the lowest position. When the steel ball 60 comes into contact with the upper end of the portion 34a and descends slightly, the steel ball 60 resists the elasticity of the coil spring 62 and rises relative to the tapered surface 48 of the tapered tube 46. , steel ball 6
0 is released from being in elastic contact with the outer circumferential surface of the resilient shaft 58. As a result, the resilient shaft 58 becomes free with respect to the tapered tube 46, and the tailstock member 6
The tip of the lead 6 comes into elastic contact with the upper end of the lead core 68 in the lead cartridge 38 due to the elasticity of the coil spring 76.
A lead lead or consumable writing lead 68 is attached to a lead pushing member 66.
As the lead 68 protrudes from the tip of the lead cartridge 38 and comes into elastic contact with the drawing paper surface due to the pressing force from the drawing work, the resilient shaft 58 descends along the inner peripheral surface of the tubular body 24 as the lead 68 wears out due to drafting work. , its lower end surface is not collided with the rear end of the cartridge 38.
Next, the solenoid 4 is
When the power to the solenoid 4 is cut off, the operating shaft 10 of the solenoid 4 rises due to the elasticity of a spring (not shown) until the stopper plate 90 is stopped by the stopper surface 94. As the operating shaft 10 rises, the arm 8 also rises, and the elevating body 26, cylinder body 44, tapered tube 48, and cartridge 38 rise, while the transmission tube 28 and release plate 34 maintain their fixed positions. At the initial stage of the rise of the arm 8, the upper end of the protruding tube portion 34a of the release plate 34 is released from being pushed up against the steel ball 60, and the steel ball 60 is moved by the elasticity of the coil spring 62 to the tapered surface 48. The resilient shaft 58 comes into elastic contact with the outer circumferential surface of the resilient shaft 58, and due to this elastic contact force, the resilient shaft 58 is gripped by the tapered tube 46 and is prevented from moving downward relative thereto. Thereby, the resilient shaft 58 is connected to the elevating body 26 and the cylindrical body 4.
The core cartridge 38 rises in conjunction with the rise of 4.
The lead core 68 protruding from the tip is separated from the surface of the drawing paper. As mentioned above, the lead core 68 is brought into elastic contact with or separated from the drawing surface by commands from the controller, and the head 2 is moved in a predetermined direction within a plane parallel to the drawing board 6 surface by means of a numerical control device. is numerically controlled to draw a predetermined pattern on the drawing surface of the drawing board 6. During the drawing operation, as the core 68 wears down and decreases, the core pushing member 66, the resilient shaft 58, and the cylindrical member 64 are lowered by the elasticity of the coil spring 76 in accordance with the decrease in the core. Therefore, by observing the height of the pin member 72, the degree of wear and tear on the core 68 can be determined. When the lead 68 decreases and the cylindrical member 64 descends, the entire length of the coil spring 76 increases by that amount, so that the writing pressure of the lead 68 against the paper surface changes. If the pen pressure becomes weaker, the lines drawn become less dense or thinner, so it is desirable to keep the pen pressure constant at all times. Therefore, in response to the lowering of the pin member 72, the pin member 84 is lowered along the vertically elongated hole 82, a suitable index recess 86 is selected, and the pin member 84 is inserted into the index recess 86. As a result, the pin-shaped member 84
is held in the index recess 86, and the pressing member 80 is locked in the selected index recess 86 via the pin-like member 84. In this way,
By lowering the presser member 80 in accordance with the amount of wear on the lead 68, it is possible to maintain the writing pressure on the lead 68 at a substantially constant level. Note that the operation of the pin-shaped member 84 is as follows:
This is done manually by stopping the movement of the head 2.
Incidentally, the number of index recesses 86 may be further increased than the number shown. In carrying out the present invention, various configurations may be used for the chuck mechanism that grips the resilient shaft 58 toward the cylinder body 44 in response to movement of the resilient shaft 58 in the direction of the drawing board 6. However, the configuration of the tapered tube 46 and steel ball 60 is not particularly limited. Further, even if the six planes of the drawing board are set perpendicular to the floor surface and the entire apparatus is configured horizontally, exactly the same effects as described above can be obtained. Incidentally, when implementing the present invention, the present invention is not particularly limited to the above-mentioned lead cartridge 38, and any suitable lead holding member 38 can be used.

Since the present invention is constructed as described above, it is possible to set the writing pressure of the writing core against the drawing paper surface to be approximately constant through a simple mechanism and operation, and to draw lines of uniform thickness without unevenness in shading. There are effects that can be achieved.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention, with FIG. 1 being a sectional view and FIG. 2 being a front view of the main parts. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Head, 4... Elevating drive device, 26... Elevating body, 38... Lead cartridge (core holding member), 54, 56... Tubular member, 58...
... Resilient shaft, 66 ... Core pushing member, 68 ... Core, 7
6...Spring, 82...Elongated hole, 84...Pin-shaped member, 86...Index recess.

Claims (1)

[Scope of utility model registration request] The substrate 1 of the head 2, which is spaced apart from the drawing surface and controlled to move in a predetermined direction relative to the drawing surface, is provided with a tubular vertical movement in a direction substantially perpendicular to the drawing surface. The body 26 is movably attached, the elevating body 26 is connected to an elevating drive device provided on the head 2, and a pipe-shaped core holding member 38 is fixed to the elevating body 26 so that its tip faces the drawing surface. , tubular members 54 and 56 are connected to the rear end side of the elevating body 26, and a resilient shaft 58 having a tubular portion whose inner diameter is larger than the outer diameter of the core holding member 38 is provided inside the tubular members 54 and 56; The tip of a core pressure spring 76 supported movably in a direction substantially perpendicular to the drawing surface and compressed inside the rear portions of the tubular members 54 and 56 is brought into elastic contact with the resilient shaft 58, and the resilient shaft 58 is connected to the elastic shaft 66, and the tip of the core pushing member 66 is connected to the rear end of the writing lead 68 in the lead holding member 38 for core pressure. A tapered surface 48 is provided on the inner diameter of the elevating body 26, and a ball 60 is placed between the tapered surface 48 and the outer peripheral surface of the resilient shaft 58 by the spring 62. A chuck release member 34 is disposed on the substrate 1 side so as to be biased in the direction of the drawing surface, positioned in the moving direction of the ball 60 in the direction of the drawing surface, and to face the ball 60;
A pressing member 80 is located at the rear end of the core pressure spring 76 at the rear of the tubular members 54 and 56.
are movably arranged along the rear portions of the tubular members 54, 56, and a vertically elongated hole 82 is provided in the rear portions of the tubular members 54, 56 along the longitudinal direction, and a pin-shaped member 84 is provided in the presser member 80. The pin-shaped member 84 is slidably inserted into the longitudinal hole 82 so that the pin-shaped member 84 projects outside the tubular members 54 and 56, and the pin-shaped member 84 is slidably inserted into the longitudinal hole 82,
A plurality of index recesses 86 for removably locking the pin-shaped member 84 are provided at predetermined intervals, and a member 72 that is displaced in conjunction with the tailstock member 66 is exposed to the outside of the tubular member 54. A drafting device characterized by: