JPS5832332B2 - Ento drum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Today, plotters are divided into two main groups that differ from each other in terms of structure and function.

namely, a flat bed type plotter group and a drum type plotter group.

Most modern flatbed plotters use a beam and carriage to move the needle in two orthogonal axes.

Most modern drum plotters employ a drum above which the recording material is held in tangential engagement by sprockets.

The drum is rotated to produce plotter motion in the direction of one axis (the X-axis).

A carriage with a plotting implement mounted thereon is movable along a fixed beam above and parallel to the drum, producing plotter movement in the direction of the other orthogonal axis (YTfdl).

Drum plotters have, among other advantages, the following advantages over flatbed plotters of comparable size:

1. Relatively simple and more compact structure.

Therefore, the manufacturing cost of drum plotters is relatively low;
In addition, it occupies less floor space and is relatively easy to maintain.

2. The inertial mass of both parts in the direction of the moving axis is relatively small.

The relatively large inertial mass of a flatbed plotter is primarily due to the mass of the movable beam.

3. There is a relatively high stiffness between the motor and the load due to the driven inertial mass.

This is primarily due to the second reason mentioned above and the relatively simple loading of the motor chain that is possible due to the construction of the drum plotter.

4. Better performance characteristics without deterioration of plot quality.

This is because drum plotters experience relatively small inertial loads at higher accelerations and velocities than are possible under the relatively large inertial loads of flatbed plotters.

However, compared to flatbed plotters in the form of plotting material, drum plotters also have distinct disadvantages.

That is, the drum type plotter cannot process sheet-like plotting material because it uses a wound material that requires sprocket guide holes to be drilled along both sides in the longitudinal direction.

The ability to process plotting material in sheet form is often desirable for the following reasons.

(1) Sheet-like materials do not require drilling sprocket guide holes, so they are inexpensive.

(2) For fast-rotating drum plotters, if newly plotted material is wound onto the roll material before the ink has dried, ink set-off marks often appear on the sheet. When plotting on something like this, you can eliminate these marks.

(3) Some users prefer to use their own sheets of preprinted or other forms and of various sizes.

The main object of the invention is therefore to obtain a plotter which has advantages specific to, on the one hand, drum plotters and, on the other hand, flatbed plotters, and advantages common to both.

Other objects and advantages of the invention will become apparent from the detailed description of the preferred embodiments set forth below.

The rotating bed plotter disclosed herein is constructed based on a basic drum plotter.

That is, it retains the simple construction of a drum plotter, and is less expensive and has a lower mass inertia load than a flatbed plotter of comparable size.

And with the added advantage of flatbed plotters that the plotting material can be handled in sheet form, this rotary bed plotter is a no-brid system that combines the advantages of the two groups of traditional plotters. It can be said that

This new performance is achieved by replacing the traditional roll material handling system for drum plotters, such as roll drives and vacuum containers, with an endless carrier belt between the regular drum and additional idler rollers. It is.

Sprocket guide holes are precisely drilled on both sides of this endless carrier belt, and this endless carrier belt is driven by a normal sprocket drum.

This endless carrier belt is used as a rotating bed carrier with the plotting medium held above it.

The actual plotting takes place above the drum.

Referring now to the drawings, and in particular to FIGS. 1, 2 and 3, a conventional flat bed plotter, a conventional drum plotter and a preferred embodiment of the present invention are shown, respectively.

The preferred embodiment of the invention includes a plotting drum 308, an idler roller 309, an endless carrier belt 307, and a movable carriage 311.

This plotter is housed inside a cabinet 301.

Here, the orthogonal drive shaft is the third b as it can be seen.
As shown in the figure.

The axis of the endless carrier belt 307 is defined as the Y-axis, and the axis of the movable carriage 311 is defined as the X-axis.

Each axis is driven by an individual motor, and the output unit and electronic unit are housed in a cabinet 301.

Wires, connections, motor drive systems, and control methods are standard and well known in the art, and are not shown as they do not form part of the present invention.

Further referring to FIG. 3, infinite carrier bell) 307
(X-axis) is seen mounted in place of the drive drum 308 and idler roller 309 so that it can be driven in two rotational directions in the X-axis direction.

A piece of plotting material 310 having the same width as the endless carrier belt 307 and the same length as the entire circumference of the belt is stretched above the endless carrier belt 307. It is designed to be driven in the direction.

The thickness of the infinite carrier belt 307 is 0.08 to 0.10.
It is preferably made from a thin (0.003 to 0.004 inch) polyester film, which provides good strength and dimensional stability, and which handles the inertial loads applied to the X-axis strainer. can be minimized.

The graphical output of a rotating bed plotter, as in any two-way plotter, is the result of the combined individual movements in the X and Y directions and the movement of the pen between the up and down modes. These are planned and controlled in advance by conventional methods.

The basic outline system of a rotating bed plotter is as follows.
This can be better understood by referring to figures a, 4b, 4c, 4d and 4c.

The figure shows the plotter with some of the cabinet cover removed and partially cut and enlarged.

The DC servo motor 401 transmits torque and rotational displacement to the drum 402 through a reduction pinion 403 and a reduction gear 404.

The motor pinion assembly is on the left support 405
installed on.

The drum gear assembly is installed between the centers of two low-friction bearings provided on each of the left side support 405 and the right side support 406 to ensure tight meshing between the pinion and the gear. .

On both sides of the infinite carrier belt 407, 12.7M (
Diameter 4.76mm (0.1mm) with a pitch of 0.500inch (0.500inch)
875 inch) sprocket guide holes 408 are precisely drilled 1 and the sprocket guide holes 408 at both ends of the drum
9.

With this arrangement, the drive drum provides both drive and positioning.

The extension and tracking adjustment of the infinite carrier belt is done using the adjustment screw 41.
Controlled by 0.

This adjusting screw 410 individually controls the position of the idler roller shafts 411 at both ends of the idler roller 413 within the confined space of the groove 412.

A DC servo motor 414 attached to a carriage drive plate 415 transfers its torque and rotational displacement to a deceleration pinion 41.
7 and reduction gear 418 to drive the carriage drive pulley 4.
16.

The carriage drive pulley and gear assembly includes a beam 41 to provide tight engagement between the pinion and the gear.
It is mounted between the centers of two low-friction bearings provided on the drive plate 9 and the carriage drive plate 415.

A carriage drive pulley 416 drives a carriage 420 and a three-pen unit 421 attached to the carriage by means of a thin and strong steel band 422.

This steel band is connected at both ends to the carriage 420 and is mounted on the carriage drive boot 'J-416 and idler pulley 423.

The playboo'l-423 is mounted on the shaft 42 on a low-friction bearing.
It can rotate freely compared to 1 in 4.

Extension and tracking adjustment of the steel band is controlled by adjustment screw 425.

This adjustment screw 425 controls the position of the two ends of the shaft 424 within the confined space of the groove 426.

The beam assembly 419 and the carriage drive plates 415 and 427, the center of the pen unit 421 is connected to the drum 402.
It is mounted parallel to drum 402 on side supports 405 and 406 above the top of the drum.

This arrangement, commonly found in drum plotters, provides a longitudinal line along the top of the rotating bed plotter's drum, and plots at the intersection of X and Y motion and pen actuation. .

3. Output and program control for the pen unit 421 uses a configuration similar to that normally used in drum plotters.

That is, this control is performed by a contact piece and a brass tip (not shown) provided below the beam assembly 419.

Although the invention has been illustrated and described as a digital increment plotter, it is clear that the basic mechanical configuration is not limited to any particular mode of operation, and furthermore, the particular design shown in the embodiments has been illustrated and described for convenience of illustration. It will also be obvious that many variations may be made within the basic idea of the invention.

Therefore, although only one preferred embodiment has been described above, it should be understood that this invention is not limited to this embodiment, and that many changes, modifications, and substitutions can be made based on the spirit of the invention. It won't happen.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional flatbed plotter, FIG. 2 is a sectional view of a conventional drum plotter, FIG. 3a is a perspective view of a preferred embodiment of the invention, and FIG. 3b is a portion of FIG. 3a. FIG. 4a is a perspective view showing the upper part of FIGS. 3a and 3b, and FIG. 4b is 4b-4b in FIG. 4a.
A cross-sectional view along line 4c-4c of FIG. 4a.
4d is a perspective view of the end of the beam assembly in FIG. 4a, and FIG. 4e is a detailed perspective view of one end of the idler roller in FIG. 4a. 308.402... Drive drum, 308°41
3...Idle roller, 307,407...
...Mugen carrier belt, 311,420...
Movable carriage, 408... Sprocket guide hole, 310... Plotting material.

Claims (1)

[Claims] 1 a cylindrical drum and a device for supporting the cylindrical drum for rotation about one axis of the cylindrical drum; a cylindrical idler roller; a device for pivoting the idler roller for rotation; an endless carrier belt disposed above the cylindrical drum and the idler roller; and an endless carrier belt for moving the endless carrier belt a distance in a straight line equal to the distance of movement of the outer circumference of the cylindrical drum. a cylindrical drum, comprising: a device for engaging said carrier belt so as to move the needle; and a carriage device for moving the needle parallel to the axis of said cylindrical drum.