JPH0412899A - Carriage base guide mechanism of automatic drafting machine - Google Patents

Abstract

PURPOSE:To eliminate the generation of wastefulness in a drafting surface or a belt, to miniaturize a drawing maching and to arbitrarily set a speed reducing ratio by positioning the pulley connected to the rotary shaft of a motor in the space part generated when a carriage base is positioned on one end side of a rail and setting the speed reducing pulley provided to the rotary shaft of the motor and the speed reducing pulley provided to a support shaft to a combination of ones having arbitrary diameters. CONSTITUTION:When a carriage base 17 is positioned at one end of a rail 15, a rotary support shaft 25 is positioned within the notch part 17a of the carriage base 17. A pulley 24 is fitted to the upper end of a rotary shaft 24 and a speed reducing vector 27 is stretched across the space between the pulley 24 and the speed reducing pulley 26 provided to the rotary support shaft 25 erected from the bottom part of one end of the rail 15. By setting the pulley 24 and the speed reducing pulley 26 to a combination of ones having arbitrary diameters, a speed reducing ratio can be freely set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a carriage base guide mechanism for an automatic drafting machine that moves a carriage base by fitting on the rails of the automatic drafting machine.

[Prior Art] An automatic drawing machine such as an XY block has a carriage base that moves in the X direction attached to a rail that moves in the X direction, and moves the rail and carriage base while a pen, etc. is fixed to this carriage base. It is designed to create a diagram by doing this. In this case, a guide recess is provided in the longitudinal direction of the rail, and
A plurality of guide rollers are provided on both sides of the carriage base, and by pulling the carriage base in the Y direction via a moving means, the guide rollers fit into the guide recess and travel, thereby moving the carriage base. ing. As a guide mechanism for such a carriage base, Japanese Utility Application No. 62158930 (Utility Application No. 1-6449)
There is one disclosed in 0). That is, this carriage base guide mechanism is constructed as shown in FIGS. 5 and 6, in which a carriage base 2 is disposed within a rail 1 having a concave cross section, and a pair of rails are provided at both ends of the rail 1. A pair of pulleys 4a, 4b are provided on the upper surface of the carriage base 2, respectively. and,
As shown in FIG. 5, pulleys 4a, 3a, 3b, 4bl
: The heald 5 is successively spanned, its both ends fixed to a pair of fixing parts 6a and 6b planted at both ends of the rail 1, and the pulley 3
The carriage base 2 is moved along the rail 1 by rotating a motor 7 connected to the lower surface of the rail 1. In the figure, reference numeral 8 denotes guide rollers disposed in an inclined state on the front and rear upper and lower sides of both sides of the carriage base 2. The carriage base 2 is held in an appropriate position by being held between the two sides. Further, 10 is a pen block for holding a pen, and is connected to the tip of a connecting portion 11 extending from the upper surface of the carriage base 2 to the outside of the rail 1.

[Problems to be Solved by the Invention] However, in the carriage base guide mechanism as described above, a long belt (approximately three times the length of the rail) is required which is much longer than the length of the rail, which is said to be uneconomical. There's a problem. Furthermore, since the reduction ratio is fixed to a constant value (a multiple of 2) depending on the number of pulleys, there is also the problem that it cannot be set arbitrarily. Furthermore, when changing the reduction ratio, it is necessary to increase the number of pulleys and use a longer belt, which causes the problem that the rail becomes larger and more expensive. In addition, as another carriage base guide mechanism, two of the deceleration belt and drive belt are used.
There is one that uses several belts. A pulley is attached to the rotating shaft of a motor provided at one end of the rail, a reduction pulley is connected to this pulley via a reduction belt, and a drive pulley is arranged coaxially with this reduction pulley. A drive belt is constructed by spanning a drive pulley and a pulley provided at the other end of the rail.

Therefore, by rotating the motor while the drive belt is connected to the carriage base, the carriage base can be moved along the rails. However, in such a carriage base guide mechanism, since the motor, reduction pulley, etc. protrude outward from one end of the rail, a dead space is created on the drawing board where drawing cannot be performed, and the drafting machine force f is large. The problem is that it becomes

This invention was made in view of these circumstances, and provides a carriage base guide mechanism for an automatic drafting machine that eliminates waste of drawing sheets and belts, makes the drafting machine more compact, and allows the reduction ratio to be set arbitrarily. Its purpose is to provide.

[Means for Solving the Problems] In order to achieve the above object, the carriage base guide mechanism of the automatic drafting machine of the present invention has a support shaft with a pulley installed at both ends of a rail having a concave cross section. A belt is stretched over a pulley, and a carriage base, which has a plurality of rollers attached to both sides and whose upper end is connected to the belt, is placed in the recess of the rail at a predetermined distance from the bottom of the recess, and A motor is disposed below one end of the rail, the rotating shaft of this motor passes through the bottom of the rail, and a reduction pulley is attached to the upper end of the rotating shaft so as to be located below the carriage base. , a deceleration pulley facing the deceleration pulley is provided on a support shaft at one end of the rail, a deceleration belt is spanned across both deceleration pulleys, and the motor is driven, thereby making it possible to move the carriage base in the longitudinal direction of the rail. The structure is as follows.

[Function] That is, the carriage base guide mechanism of the automatic drafting machine according to the present invention is such that a predetermined space is formed between the carriage base and the bottom of the rail, and the carriage base is placed at one end of the rail. When positioned, a pulley connected to the rotating shaft of the motor is positioned in the space.

Therefore, the pen of the pen block connected to the carriage base can move over almost the entire surface of the drawing board.
Dead space on the drawing board will be significantly reduced. In addition, by combining the reduction pulleys provided on the motor's rotating shaft and the reduction pulleys provided on the support shaft with arbitrary diameters, it becomes possible to freely set the reduction ratio, not just a multiple of 2. . Additionally, the drive belt can be short rather than a long belt as shown in FIGS. 5 and 6. In addition, in this invention, a rotating wheel such as a gear is included in the pulley, and a cloth-like rotating means such as a chain or wire is included in the belt.

The present invention will now be described in detail based on examples.

[Example] FIG. 1 shows an embodiment of the invention.

That is, in the figure, 15 is a rail with a concave vertical cross section that is movable in the X direction of the drawing board 16 (perpendicular to the paper surface), and 17 is a rail that extends in the longitudinal direction of the rail 15 within the rail 15. This is a carriage base that is movable. As shown in FIG. 2, the rail 15 is
A protrusion 15a is provided protruding from the upper end of the inner side surface, and the upper end of the guide recess 15b is narrow, and guide ills 15c are provided on both sides of the bottom surface.

The carriage base 17 has a notch 17 in the center of one end edge.
It is composed of a plate-shaped body having a side surface 17b facing downward, and a notch 17c provided in the center of the other side surface. 18 is a roller fixing part disposed within the notch 17c, and both sides are connected to the notch 17c.
It is fixed in a sandwiched state between a pair of support pieces 19 that stand up from the edge of the frame. The corner between the other side surface and the lower surface of this roller fixing portion 18 is formed into a downwardly inclined surface, and guide rollers 20a are provided in an inclined state at both ends of this inclined surface and the above-mentioned inclined surface 17b. .

Guide rollers 20b are provided at both ends of the other side of the carriage base 17 and at the center of one side (not visible in the figure), and are each attached to a hanging piece 21 hanging from the lower surface of the carriage base 17. The guide rollers 20a and 20b are constructed by fitting a plastic ring-shaped body around the outer periphery of a bearing rotatably attached to a shaft 20c. 22 is the carriage base 17
This is a connecting portion extending from the top surface of the rail 15 to the outside of the rail 15, and a pen block is fixed to the tip of this connecting portion.

Note that the roller fixing portion 18 can be adjusted in position in the vertical direction by adjusting a screw, and by adjusting the position, the height position of the guide roller 2°a on the other side can be changed. . In FIG. 1, reference numeral 23 denotes a motor disposed below one end of the rail 15, and its rotating shaft 23a passes through the bottom of the rail 15.
The guide recess 1.5b extends into the guide recess 1.5b. This rotating shaft 2
A pulley 24 is attached to the upper end of the rail 15, and a rotation support shaft 25 (bearings are fixed to the outer periphery of both ends and is rotatable) is installed from the bottom of one end of the rail 15. ) mounted on the reduction pulley 26
A deceleration belt 27 is stretched between the two. A driving pulley 28 is attached to the upper part of the rotation support shaft 25, and the other end of the rail 15 is connected to the pulley 28.
A driving belt 29 is stretched around a pulley (not shown) provided via a support shaft. The support shaft is fixed to the rail 15, and the pulley is rotatably attached to the outer periphery of the upper end of the support shaft via a bearing. The belt 29 is connected to the upper end of the carriage base 17, and is adapted to transport the carriage base 17 along the rail 15 by driving (--123), so that when the carriage base 17 is located at one end of the rail 15, the belt 29 is connected to the upper end of the carriage base 17. , the rotation support shaft 25 is positioned within the notch 17a of the carriage base 17.The guide roller 20a is in contact with the lower side of the protrusion 15a of the rail 15, and the guide roller 20b is in contact with the bottom surface of the rail 15. guide groove 1
5c (see FIGS. 3 and 4), thereby preventing the carriage base 17 from being pulled out from the rail 15 and preventing rattling 75f. Note that the motor 23 moves in the X direction of the drawing plane together with the rail 15, and cannot move in the Y direction.

In this configuration, when drawing, a pen is attached to the pen block, paper is placed on the drawing board I6,
Drawing is performed by moving the rail 15 and carriage base 17 while the tip of the pen is in contact with the paper. In this case, the pen can be moved to every corner of the drawing board 16, and there is almost no wasted space on the drawing board 16 where drawings cannot be made.

Thus, according to this carriage base guide mechanism,
There is almost no waste on the drawing board 16 where drawing cannot be done, and the drawing board 16 can be made smaller. Also,
By combining the pulley 24 and the reduction pulley 26 with arbitrary diameters, the reduction ratio can be freely set.

Furthermore, since the carriage base 17 is provided with the notch 17a, the carriage base 17 can be further moved toward one end of the rail 15. Also, a guide roller 20b that moves in the guide groove 15c of the rail 15 and a guide roller 2 that comes into contact with the protrusion 15a.
Three rollers 0a are provided alternately on each side of the carriage base 17, and the guide rollers 20a on the other side of the carriage base 17 can be adjusted vertically to prevent the carriage base 17 from wobbling. It becomes possible to hold it in an appropriate position in a state where it is prevented.

[Effects of the Invention] As described above, in the carriage base guide mechanism of the automatic drafting machine of the present invention, the reduction pulley etc. are arranged below the carriage base, so there is no waste in the drafting drawing, and the drafting machine can be made smaller. can be converted into Further, the reduction ratio can be set arbitrarily, and a short belt can be used as the drive belt.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view showing the rail and carriage base used therein,
Figure 3 is a sectional view taken along line A-A' in Figure 1, and Figure 4 is B in Figure 1.
-B' sectional view, FIG. 5 is a plan view showing a conventional example, and FIG. 6 is a cc' sectional view thereof. 15...Rail 17...Carriage base 20
a, 20b...Guide roller 23...Motor 2
3a...Rotating shaft 24.28...Pulley 25...
・Rotation shaft 26...Deceleration pulley 27, 29...
Belt figure 4

Claims (2)

[Claims] (1) A support shaft with pulleys is installed at both ends of a rail with a concave cross section, a belt is spanned across both pulleys, and a plurality of rollers are attached to both sides in the recessed part of the rail, and the upper end is connected to the belt. The carriage base is placed at a predetermined distance from the bottom of the recess, a motor is placed below one end of the rail, and the rotating shaft of this motor is passed through the bottom of the rail. A deceleration pulley is attached to the upper end of the rotating shaft so as to be located below the carriage base, a deceleration pulley facing the deceleration pulley is provided on a support shaft at one end of the rail, and a deceleration belt is connected to both of the deceleration pulleys. A carriage base guide mechanism for an automatic drafting machine, characterized in that the carriage base is movable along the longitudinal direction of the rail by spanning the rail and driving the motor. (2) The upper end side of the recess in the rail is formed narrowly,
The automatic drafting machine according to claim (1), wherein the plurality of rollers include a roller that contacts the bottom surface of the recess and a roller that contacts the upper end side wall surface of the recess and prevents the carriage base from moving upward. Carriage base guide mechanism.