JPS6130870Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sheet winding type writing board device that uses a rolled sheet as a writing surface.

A sheet-type writing board device has already been proposed in which a rolled or endless sheet is rolled up or rotated to expose a new surface as a writing surface, but conventional It is difficult to hold the writing surface flat without wrinkles or sagging. In particular, when using a rolled sheet for winding and unwinding, it is necessary to rotate the winding shafts at both ends of the roll paper using a motor or the like to repeat winding and unwinding. However, if both motors do not operate in accurate balance, it will not be possible to maintain uniform tension on the sheet, resulting in wrinkles and sagging.
In fact, it is impossible to rotate or stop two motors in a balanced manner in any case.

In order to improve the above-mentioned problems, the applicant installed one winding shaft on a shaft fixed to a constant force spring with a constant output, and the other winding shaft was driven by a reversible motor. Newly developed sheet winding type writing board device (see Japanese Patent Application Laid-open No. 134228/1983)
has been applied for.

According to this device, by driving one winding shaft with a motor, the constant force spring that fixes the other winding shaft can adapt to the winding or unwinding action. I learned that there are various problems. In other words, with this device, when installing or removing a roll sheet and replacing it, it is necessary to completely wind the roll sheet onto the constant force spring side, and when installing, the winding shaft of the constant force spring must be connected to the motor first. The side winding shaft must be installed later, and when removed, the motor side must be removed first and the constant load spring side must be removed later. If you make a mistake in this procedure, you may not be able to wind the film during the process or it may malfunction.

In other words, if the roll sheet is wound around the winding shaft on the motor side when installed, or if it is installed from the motor side, there will be no problem in winding it up on the motor side, but when winding it on the constant force spring side, When the sheet is attached, the reaction force of the constant force spring disappears and winding is no longer possible. Also, if you remove the winding shaft or remove the constant-load spring side first while the sheet is wound around the motor side, the fixed-load spring that is wound around will rebound instantly due to the sheet movement, causing a failure. , and also dangerous.

The present invention has improved the various points mentioned above, and has developed a sheet winding system that does not cause wrinkles or sag on the sheet surface even when the rolled sheet is used horizontally and is repeatedly wound and unwound. The present invention aims to provide a type writing board device.

An example of implementing the present invention will be described below based on the accompanying drawings.

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a cross-sectional plan view of the same, and FIG. 3 is a side view.

1 to 3, reference numeral 1 denotes a main body, and a gear box is provided with a gear group on both left and right sides (or both upper and lower ends) of the main body for decelerating the output of the motor via gears and rotating the shaft 21 at a low speed. 22
A drive shaft 3 is fixed to one of the left and right shafts 21 with a set screw 31 as shown in FIG. A pin 32 that fits into a notch 62 provided in the shaft 61 is provided in a protruding manner.

The other shaft 21 is engaged with the winding shaft via a differential spring mechanism shown in FIG. That is, the differential spring mechanism includes a main drive shaft 43 fixed to the shaft 21 with a set screw 41, a notch rotatably fitted to the main drive shaft 43, and provided in the winding shaft 61 of the roll sheet 6. 62, a differential shaft 4 having a protruding pin 42 fitted therein, and a coil-shaped differential spring 44 interposed between the outer periphery of the main driving shaft 43 and the inner periphery of the differential shaft 4 and coupling the two. And the spring force of this differential spring 44 is equal to the spring force of the shaft 2 when the motor 2 is started.
It has a characteristic that is weaker than the torque of 1 and stronger than the frictional force during writing or erasing, and when either the differential shaft 4 or the shaft 21 of the other motor is stationary, when either motor is driven, When the differential spring 44 is wound or unwound and the motor temporarily idles, and the differential spring 44 comes into close contact with the outer periphery of the main drive shaft 43 or the inner periphery of the differential shaft 4, the differential shaft 4 and the main drive shaft 43 When the motor is stopped in this state, the differential shaft 4 is reversed by the reaction force of the differential spring 44.

As shown in FIG. 1, the drive shaft 3 and the differential shaft 4 are mounted on the lower portions of both the left and right ends of the main body 1, and the driven sockets 5 that form a pair with these are mounted on the upper portions of the opposite left and right ends. As shown in FIG. 6, it can rotate freely by the socket shaft 51 and is always urged in the protruding direction by the coil spring 52, and the sliding base 53, the sliding body 54, and the coil spring 5
5 and an adjustment screw 56 so as to be slidable left and right. Therefore, by fitting the upper end of the winding shaft 61 of the roll sheet 6 into the driven socket 5, pushing the driven socket 5, and fitting the lower end with the drive shaft 3 or the differential shaft 4, the roll sheet can be rolled. 6 is attached so that the center ring of the winding shaft 61 can be adjusted with an adjustment screw 56. When removing the roll sheet, reverse the installation process.

As shown in FIG. 2, the rolled sheet is guided onto the surface of the panel 7 of the main body 1, and writing or erasing is performed on the panel 7, and either of the left and right gear motors 2 is driven as necessary. wind or unwind the sheet. At this time, the gear motor on the opposite side rotates following the movement of the seat.

Presser edges 81, 82 are attached to the upper and lower edges of the main body 1 so as to be openable and removable.
The seat is installed by opening or removing it, and after being installed, it is returned to its original state to prevent the upper and lower edges of the sheet from lifting up.

As mentioned above, the sheet winding type writing board device of the present invention uses two motors as drive sources, and
At least one of the output shafts of the motors is connected to the winding shaft via a differential spring mechanism, and the differential spring mechanism connects a main drive shaft 43 fixed to the shaft 21 and a main drive shaft 43 fixed to the shaft 21. It consists of a differential shaft 4 rotatably fitted, a coiled differential spring 44 interposed between the main drive shaft 43 and the differential shaft 4, and coupling them together; The spring force of the spring is weaker than the torque of the shaft 21 when starting the motor, and stronger than the frictional force during writing or erasing, so no matter which side of the motor is driven, the force of that motor will The other motor follows suit and rotates while always maintaining balance, making it possible to wind up or unwind the rolled sheet while maintaining a smooth plane, and to always apply tension to the rolled sheet when it is stopped. It is possible to prevent wrinkles and sagging from occurring.

That is, when the motor on the differential shaft side is driven, first the differential spring 44 is wound up, and the differential spring moves to the main drive shaft 43.
The motor idles until it comes into close contact with the outer periphery of the roll sheet, and then the main drive shaft 43 and the differential shaft 4 work together to wind up the roll sheet, and the motor on the non-driving side rotates accordingly. If the driving side motor is stopped in this state, the driven side motor will overrun and discharge the sheet, but the differential shaft 4 is reversed to apply tension to the sheet.

Conversely, if you drive the motor on the side without the differential shaft,
As the sheet is wound up, the winding shaft on the differential shaft side rotates, and therefore the differential shaft 4 also rotates, but initially the rotation is not transmitted to the main driving shaft 43 and only the differential spring 44 is unwound. Only after the differential spring 44 comes into close contact with the inner periphery of the differential shaft 4 due to this unwinding is the rotation transmitted to the main drive shaft 43, and the motor on that side rotates accordingly. Next, when the drive-side motor is stopped in this state, the driven-side motor overruns and discharges the sheet, but the difference is caused by the reaction force of the differential spring 44 that has been rewound as described above. The moving shaft 4 is reversed to apply tension to the sheet.

In addition, in any of the above cases, when starting the motor, the other motor follows and rotates after winding or unwinding the differential spring, so the starting torque of the motor is very small. Therefore, the machine can be started smoothly and the roll sheet can be wound up or rewound using a small motor with low output.

In addition, as mentioned above, the roll sheet surface according to the present invention is constantly given tension by the differential spring, so even if frictional force is applied due to writing or erasing,
Since the force is smaller than the static force of the motor and the reaction force of the differential spring, the roll sheet can be tightly wound around the reel without wrinkles or sagging due to writing or erasing. It is possible to maintain a uniform tension state no matter how many times the sheet is wound or unwound, and for this reason, the lateral dimension of the writing board can be arbitrarily lengthened by placing the rolled sheet horizontally. can.

In addition, in handling, since there is no special order for attaching and detaching the roll sheet as mentioned above, it is extremely easy to attach and detach the roll sheet, and therefore, it is possible to wind up the roll sheet as it is without erasing the information written on the roll sheet. , the roll sheet and the roll can be removed and stored together, and the roll sheet with written information left and stored in this way can be easily used by attaching it to the writing board device again. be.

Note that if a reversible motor, a motor with a built-in brake such as a brake motor, a motor with a large static force such as a torque motor, or a motor equipped with a separate braking device is used instead of the gear motor in the above embodiment, the seat Winding,
During rewinding, braking force is applied to the driven motor, so the sheet is wound and rewound under strong tension.

In addition, in the above embodiment, an example was shown in which a differential spring mechanism was provided on one motor shaft, but differential spring mechanisms may be provided on both motor shafts to further increase the range of reversal tension. Can be made larger.

As described above, according to the present invention, the sheet winding type writing board does not cause wrinkles or sagging on the sheet surface even when the roll sheet is repeatedly wound and unwinded, and is easy to use. There is an effect that can be obtained with the device.

[Brief explanation of the drawing]

The attached drawings show an example of the implementation of the present invention.
FIG. 1 is a front view, FIG. 2 is a cross-sectional plan view, and FIG. 3 is a side view. 4 is a perspective view of a portion of the drive shaft in cross section, FIG. 5 is a perspective view of a portion of the differential shaft in cross section, FIG. 6 is a perspective view of a portion of the driven socket in cross section, FIG. 7 is a perspective view of the rolled sheet. 1...Main body, 2...Gear motor, 21...
Shaft, 3... Drive shaft, 4... Differential shaft, 43... Main drive shaft, 44... Coiled differential spring, 5... Driven socket, 6... Roll sheet, 61... Winding shaft, 62
...Notch in the winding shaft, 31, 41... Pin into which the winding shaft fits, 7... Panel.

Claims (1)

[Scope of utility model registration request] Winding shafts are attached to both ends of the roll sheet, and both winding shafts are removably engaged with shafts driven by separate motors, and at least one winding shaft is connected to the motor via a differential spring mechanism. The differential spring mechanism is connected to a shaft driven by a motor, and the differential spring mechanism is rotatably fitted to the main driving shaft fixed to the shaft driven by the motor and detachably engaged to the winding shaft. a differential shaft that can be attached to the drive shaft; a coil-shaped differential spring that is interposed between the outer periphery of the main driving shaft and the inner periphery of the differential shaft and that connects the two; A sheet winding type writing board device characterized in that the spring force of the dynamic spring is set to be weaker than the shaft torque at the time of starting the motor and stronger than the frictional force at the time of writing or erasing.