JPS61197297A - Lifting gear for writing utensil of automatic drawing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention moves a casing to a desired portion of paper on a loading surface, and controls a support arm protruding from the casing by a controller to hold the paper on the support arm. Regarding an automatic drawing machine that automatically draws a pattern such as a predetermined figure or character on a paper within a predetermined drawing range using a writing instrument, more specifically, the above-mentioned writing instrument is driven in an upward and downward direction with respect to a mounting surface. This invention relates to a device for lifting and lowering writing instruments.

[Conventional technology]

This automatic drawing machine is designed to be compact in size so that the casing can be manually moved on the mounting surface, and the pen support arm protruding from the casing is controlled by a microcomputer-based controller in the XY-axis directions on the mounting surface. It is disclosed in Japanese Patent Publication No. 57-42519.

In this type of automatic drawing machine in which the tip of the support arm protrudes from the casing, it is not preferable to increase the weight of the tip of the support arm. If the tip of the support arm is heavy, the support arm may bend or be unable to stop suddenly due to inertia, making it impossible to control the movement of the support arm in the X and Y directions at high speed.

Therefore, a drive device such as a solenoid that drives the writing instrument up and down with respect to the mounting surface is not mounted on the tip of the support arm, but is fixed at the bottom of the casing, and a rod-shaped cam is connected to the rotation shaft of the drive device. are doing. A support arm is placed on this rod-shaped cam, and the support arm is moved up and down by rotation of the rod-shaped cam. When the eccentricity of the rod-shaped cam in contact with the support arm decreases, the support arm descends due to its own weight around the rotational connection with the Y cursor, and when the eccentricity of the rod-shaped cam increases, it rises.

By this vertical movement of the support arm, the writing instrument held at the tip of the support arm moves up and down with respect to the placement surface.

[Problem that the invention seeks to solve]

In the case of this device, the rod-shaped cam is supported at a fixed position A as shown in FIG.

The support arm B is parallel to the longitudinal direction of the rod-shaped cam, that is,
Move in the coordinate direction and the orthogonal direction, ie, the Y coordinate direction. Therefore, when the support arm moves in its longitudinal direction, that is, in the Y-coordinate direction, the contact portion of the support arm B with the rod-shaped cam, that is,
The lifting fulcrum of the support arm moves, and as a result, the lifting stroke C of the support arm tip B' due to the rotation of the rod-shaped cam changes as shown.

In this type of automatic drawing machine, it is desirable that the distance between the tip of the writing instrument and the placement surface be always constant when the writing instrument is raised. If the above interval is large, it will take a long time to transition from the pen up state to the pen down state, slowing down the drawing speed, and when the pen is down, the impact on the writing instrument, that is, the surface on which the pen tip is placed, will be large, which may damage the pen tip. This will result in Furthermore, if the above-mentioned interval is small, there is a risk that the pen tip will touch the paper when the support arm moves in the XY direction when the pen is raised. Therefore, as in the above device, if the lifting stroke of the tip of the supporting arm changes due to the movement of the supporting arm in the Y direction, when the writing instrument is raised. It becomes impossible to maintain a constant distance between the tip of the writing instrument and the mounting surface,
This results in defects such as those described above.

SUMMARY OF THE INVENTION An object of the present invention is to provide a writing instrument elevating device for an automatic drawing machine that eliminates the above-mentioned defects.

[Means to solve problems]

To achieve the above object, the present invention includes a casing 2 movably mounted on a mounting surface, and an X cursor 10. 12, and an X-axis guide 1 fixed to the X-cursor 10.12 in a direction perpendicular to the X-axis guide 6.8.
8.20, a Y cursor 22 slidably attached to the X-axis guide 18° 20, and a tip connected to the Y cursor 22 extending from an opening provided in the casing 2 to the front of the casing 2. In an automatic drawing machine equipped with a protruding support arm 26 and a drive mechanism for driving the XY cursors 10, 12.22, one end of the first link 23 is connected to the Y cursor 22 on the X-axis guide 6. 8, one end of the elevating link 31 is rotatably connected to the other end of the first link 23, and one end of the second link 29 is rotatably supported. Arm 26
is rotatably supported about an axis parallel to the X-axis guide 6.8, the other end of the elevating link 31 is rotatably connected to the other end of the second link 29, and the first and second
Rotation support points PL, P2 at each end of the links 23.29 and rotation connection points P3. with the links 23.29 at both ends of the lifting link 31. A writing instrument holder 88 is supported on the support arm 26 so as to be movable up and down, and the writing instrument holder 88 is connected to the elevating link 31. is engaged with an elevating displacement member 114 that is linked to a drive mechanism.

[Effect]

Due to the drive mechanism, the XY cursor +0.1.2°22 is
When driven along the Y-axis guides 6.8, 18.20, the support arm 26 moves along the XY-axis guides 6.8, 18.20, and the writing instrument holder 88 at the tip of the support arm 26 moves.
moves within the drawing range in front of the casing 2 in the XY coordinate axes directions. On the other hand, the lifting mechanism 114
When the vertical displacement member 1111 moves up and down with a constant stroke, the lifting link 31 moves up and down in conjunction with the lifting and lowering displacement of the lifting displacement member 1111. The writing instrument holder 88 is raised and lowered with respect to the vertical plane a by the lifting VF movement of the lifting link 31, and the writing instrument holder 88
The tip of the writing instrument 102 held by the writing instrument 102 touches or touches the paper on the placement surface, and predetermined characters, symbols, etc. are written on the paper.
Figures etc. are automatically drawn. Y of the support arm 26
The engagement portion of the elevating link 31 with the elevating displacement member 114 is displaced by the movement in the coordinate direction, but due to the principle of the parallelogram link, the elevating link 31 is moved as shown in FIG.
The lifting stroke of the tip does not change, and the rising return position of the writing instrument does not change.

〔Example〕

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

Reference numeral 2 denotes a casing of an automatic drawing device, and a mounting bracket 5 is provided on the front wall of the bottom wall of the casing for removably connecting the casing 2 to a scale mounting plate of a known universal parallel ruler device.
is fixed. Reference numerals 6 and 8 denote X-axis guides fixed to the bottom of the case 2 via brackets, and the inner diameter portion of an X-cursor 10.12 is slidably inserted into the X-axis guide 6.8.

A Y-axis guide 18.20 is installed over the X-cursor 10.12. 22, the tubular portion is the Y-axis guide 18.
20, and one end of a pair of links 23 is rotatably supported at the rising portion of the Y cursor 22 about an axis parallel to the X-axis guide 6.8. The rear end of the support arm 26 is fixed to the Y cursor 22, and the front part of the support arm 26 is
It projects forward of the casing 2 through an opening formed in the front wall of the casing 2 along the X-axis guide 6. 2
Reference numeral 9 denotes a pair of links whose one end is rotatably supported by a bracket fixed to the tip of the support arm 26 about an axis parallel to the X-axis guide 6°8.
Blocks 33 and 35 fixed to both ends of the elevating link 31 are rotatably supported at the other ends of the link 23 and the elevating link 31, respectively. Rotation support points PL and P2 of the links 23°29 and rotation connection points P3 at both ends of the elevating link 31. Line segments connecting each point of P4 form a parallelogram. Reference numeral 30 denotes a Y motor fixed to the bottom wall of the case 2, and a pinion 32 is fixed to the output shaft of the Y motor.
It meshes with a gear 70 fixed to one end of 4.

A drum 40 is fixed to the other end of the shaft 34, and a flexible wire rope 42 is wound around the drum 40 a plurality of times. One of the ropes 42 is connected to rope pulleys 44, 46, 48 .
50 with an appropriate tension, the rope 4
One end of 2 is connected to a mounting shaft fixed to case 2. The other end of the rope 42 is a rope pulley 52,54,
56 and 58 with appropriate tension, and the other end of the rope 42 is connected to a mounting shaft fixed to the bottom wall of the case 2. The pulleys 44 and 52 are connected to the case 2.
It is rotatably supported on the bottom wall of the the pulley 46,
50 is rotatably supported by the X cursor 10, and the pulleys 54 and 58 are rotatably supported by the X cursor 12. The pulleys 48 and 56 are connected to the Y cursor 22.
It is rotatably supported on the shaft. 60 is an X motor fixed to the bottom wall of the casing 2, and a pinion 62 is fixed to the output shaft of this motor. Reference numeral 64 denotes a shaft body rotatably supported by a bracket fixed to the bottom wall of the case 2, and belt pulleys 66, 68 and a gear 71 are fixed to this shaft body. An endless timing belt 76.78 is disposed between the belt pulley 66.68 and a belt pulley 72.74 rotatably supported on the bottom wall of the case 2 along the X-axis guide 6.8. The stake has been passed. The gear 71
is meshed with the pinion 62 via an intermediate gear.

The upper horizontal portions of the belts 76, 78 are secured to the X cursors 10, 12 by fixing screws 82, as shown in FIG. 84. 84 is a guide shaft installed between the tip of the support arm 26 and the upper horizontal part of the bracket 90 fixed thereto, and the writing instrument holder 8 is attached to these guide shafts.
The writing instrument holder 88 is inserted into the hole 8 so as to be able to move up and down, and the writing instrument holder 88 is urged upward by the elastic force of a coil spring 92.

A roller 96 is rotatably supported by the holder 88, and the surface of the roller 096 is in elastic contact with the lower surface of the block 35 at one end of the elevating link 31. In Figure 3, 9
8 is an L-shaped rocking piece, the middle part of which is the casing 2.
A shaft 100 is rotatably supported on one side wall, and one end of a shaft body 102 is connected to one of the swinging pieces 98 . Swing piece 9
A protruding piece 98a is formed on the other side of the solenoid 10 fixed to the casing 2 in a right angle direction.
It faces the output shaft 106 of No. 4.

The swing piece 98 is moved by the spring 108 as shown in FIG.
It is biased counterclockwise about the shaft 100.

In FIG. 2, reference numeral 110 denotes a swing piece, one of which is connected to the other end of the shaft body 102, and the other end of the swing piece 110 is rotatably supported by the shaft 112 on the side wall of the casing 2. ing.

The shaft 102 is set parallel to the X-axis guide 76,78. 114 is an elevating displacement member, and the pipe portion 1 of this
14a is slidably fitted into the shaft body 102, and the elevating link 31 is slidably fitted into a pipe portion 114b that is perpendicular to the pipe portion 114a. The writing instrument holder 88 holds a writing instrument 10 such as a commercially available hollow pen.
2 is removably attached.

When the solenoid 104 is in a de-energized state, the writing instrument 1
The tip of the paper 02 is configured to be spaced apart from and opposed to the paper on the table surface by a predetermined distance. A display device made of liquid crystal and a keyboard were disposed on the upper surface of the casing 2, and these were built into the casing 2. It is connected to a controller consisting of a microcomputer. The keyboard is provided with data keys and various command keys for recalling various figures and character patterns from the storage section of the controller. The XY motors 60, 30 and solenoid 104 are connected to the controller. The controller is connected to an external power source via a cord.

Next, the operation of this embodiment will be explained.

The casing 2 is placed at a desired position on the paper on the table, and in this state, the keyboard is operated to input drawing information to the controller.

Next, when a drawing operation is started, a drive signal is supplied from the controller to the XY motors 60, 30, and the output shafts of the XY motors 60, 30 rotate. Due to this rotation,
The cursor 10.12 moves along the X-axis guide 6.8 and the Y-cursor 22 moves along the Y-axis guide 18.20. By moving the X cursor], 0, and 12, the support arm 26 moves in the left-right direction, that is, in the X direction in FIG. 2, along the opening in the front wall of the casing 2. Also, by moving the Y cursor 22, the support arm 26 is
move in the direction. When a drive current is input from the controller to the solenoid 104, the output shaft 106 moves as shown in FIG.
The swinging piece 98 protrudes to the right and rotates clockwise about the shaft 100 in FIG. 3, and the shaft body 102 descends.

In conjunction with the lowering of the shaft body 102, the elevating displacement member 114 also descends, and the elevating link 31 is pushed down in a parallel state. As the lifting link 31 descends, the writing instrument holder 88 is pushed down along the guide shafts 84 and 86 against the elastic force of the coil spring 92, and the tip of the writing instrument 102 is pushed down against the solenoid 1.
Due to the excitation force of 04, it comes into elastic contact with the paper on the table.

When solenoid 104 is de-energized, solenoid 1
04's output shaft 106 is retracted to a predetermined return position by the elasticity of the spring 108, the elevating displacement member 114 rises to the predetermined position, and the holder 88 is moved up and down along the guide shafts 84 and 86 by the elastic force of the coil spring 92. It moves up to a predetermined position in conjunction with the member 114 and the elevating link 31.

At this time, the tip of the writing instrument 102 is separated from the paper for a predetermined period of time. A predetermined pattern is automatically drawn on the paper on the table, that is, the placement surface, by the above-mentioned raising and lowering of the writing instrument holder 88 and movement of the support arm 26 in the X and Y directions.

Next, another embodiment will be described with reference to FIG. 4.5.6.

Reference numerals 84 and 84 designate a pair of guide shafts fixed between the support arm 26 and the brackets 90 and 90 fixed thereto, and slide bearings 120, 120 are fixedly press-fitted onto these guide shafts of the writing instrument holder 88. The tubular part is slidably inserted. A rubber stopper 122 is fixed to the upper horizontal portion of the bracket 9o. The rubber stopper 122 is for locking the upper end of the tubular portion of the writing instrument holder 88. The writing instrument holder 88 is urged downward by the elastic force of the coil spring 124. 126 is a roller that is rotatably supported by the holder 88, and the surface of the roller 126 is connected to the lifting link 31.
It is in elastic contact with the upper surface of the block 35 at one end. The other t5 are the same as in the first embodiment.

In the above configuration, the elevating displacement member 114 descends,
In conjunction with this, when the lifting link 3] is lowered, the writing instrument holder 88 is lowered by its own weight and the elastic force of the coil spring 124, and the tip of the writing instrument 102 is brought down by the coil spring 1.
It comes into contact with the paper surface with the pressure of the pen due to the elasticity of 24. Further, when the elevating displacement member 114 rises, the roller 126 moves to the block 3.
5, the writing instrument holder 88 is locked by the rubber stopper 122, and the writing instrument 102 rises and returns to a position separated from the paper surface by a predetermined distance on the placement surface.

〔effect〕

As described above, in the present invention, the pen holder is moved up and down using the parallelogram link, so the up and down stroke of the pen holder can be set constant, and since the pen holder is not equipped with a driving device, It is possible to reduce the weight at the tip of the support arm, to reduce the inertia at the tip of the support arm, and to control the support arm in the X and Y directions with high precision and high speed.

[Brief explanation of the drawing]

The figures show preferred embodiments of the present invention; FIG. 1 is a side sectional view, FIG. 2 is a plan view with the casing cover removed, FIG. 3 is a side view, and FIG. 5 is a plan view, FIG. 6 is a sectional view taken along line A--A, and FIGS. 7 and 8 are explanatory views. 2...Casing, 6, 8...X-axis guide. 10.12...X cursor, 18.20...
...Y-axis guide, 22...Y cursor. 23.29...link, 31...lifting link, 26...support arm, 30...Y motor, 40...drum, 42...rope. 44.46, 48.50... Rope pulley. 52.54,56,58...rope pulley. 60...X motor, 66.68. ...Belt pulley, 84...Guide shaft, 88...
...Writing instrument holder, 104...Solenoid. 102...Writing implements

Claims (1)

[Claims] 1. A casing 2 movably placed on a placement surface, and an X-axis guide 6 built into the casing 2.
, 8, and an X cursor 10, 12 driven along the
Y-axis guides 18, 20 fixed to the cursors 10, 12 in a direction perpendicular to the X-axis guides 6, 8, and a Y-cursor 22 slidably attached to the Y-axis guides 18, 20; a support arm 26 connected to the Y cursor 22 and whose tip protrudes forward of the casing 2 from an opening provided in the casing 2; and a support arm 26 connected to the Y cursor 22;
, 12 and 22, one end of the first link 23 can be freely rotated around an axis parallel to the X-axis guides 6 and 8 toward the Y cursor 22 side. One end of the elevating link 31 is rotatably connected to the other end of the first link 23, and one end of the second link 29 is connected to the support arm 26 by the X-axis guide 6.
, 8, and the other end of the elevating link 31 is rotatably connected to the other end of the second link 29, and the first and second links 23 , 29
Rotation fulcrums P1 and P2 at each end of and rotation connection points P3 and P4 with the links 23 and 29 at both ends of the elevating link 31;
A writing instrument holder 88 is supported on the support arm 26 so as to be movable up and down, and the writing instrument holder 88 is connected to the elevating link 31. A writing implement elevating device characterized in that it engages with an elevating displacement member 114 linked to a drive mechanism.