JPS587855B2 - Spring constant variable mechanism of paper folding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper folding device that suspends a paper holder by a spiral spring whose tension is balanced according to the amount of paper stacked, and that changes the spring constant of a paper folding device that folds and stores paper on the paper holder. It is about the mechanism.

As a mounting mechanism for a helical spring that is conventionally used in this type of device and has a variable tension balanced over a wide range, it is desirable to use a plurality of spring constants that are changed stepwise.

However, it was not possible to make the spring constant variable with a single helical spring.

For example, FIGS. 1a and 1b show the structure of a helical spring used in a paper holder in a conventional paper folding device.

In the same figure a, 1 is a line printer, and paper 5 folded is sent between the type drum 3 and the hammer 4 by the paper feeding mechanisms 2l and 22, and after printing, it is sent to the folding device 10 via the discharge path 6 and stacked on the paper holder 7. It will be done.

In this case, it is necessary to maintain the distance from the end of the discharge path 6 to the top surface of the paper stack on the paper holder 7 at an approximately constant distance in order to fold the paper in an orderly manner. The platform 7 is configured to descend.

That is, the paper holder 7 is suspended by a wire 9 that is connected at one end to a helical spring 11 provided between spring fittings 12 and 13 via a spring fitting 13 and wound around a pulley 8. It can be moved in the direction of the arrow as the amount increases.

In this manner, the spring 11 is expanded by the amount of paper stacked, and the paper holder 11 is lowered by that amount, so that the top surface of the stack of paper sheets is always maintained at the same position.

If there is only one type of paper, one set of spiral springs 11 is sufficient, but if the paper has various sizes, it is necessary to set the spring constant to match the weight of the paper when replacing the paper.

On the other hand, in the conventional method, the difference between A and B in FIG. As shown in the arrow view seen from direction A, the wire 9. , 9, a plurality of hanging springs 111 are suspended between the spring stoppers 12 and 13.
~11n was set in advance, and the springs were applied and removed symmetrically as needed to obtain an appropriate spring constant.

However, with this configuration, the operation of engaging and disengaging the springs 111 to 11n is troublesome and is dangerous because it is easy to pinch one's fingers, and the adjustment range is determined in steps depending on the number of springs, making it impossible to make fine adjustments.

Furthermore, it has the disadvantage that left and right balance tends to deteriorate.

The present invention eliminates the disadvantages of multiple helical springs as described above, and its purpose is to obtain a variable spring constant using a single helical spring. The purpose is to provide a constant variable mechanism.

Examples of the present invention will be described in detail below.

FIG. 2a is an explanatory diagram showing the configuration of an embodiment of the present invention.

In the same figure, the paper holder 20 is the folding device 1 of FIG.
It has the same structure as the paper holder 1 of No. 0, and folded sheets 22 are stacked on an L-shaped base plate 21.

The wires 251, 252 are fastened to the hanging fittings 231, 232 at the upper left and right ends of the paper holder 20, and are brought together by the common pulley 26 via the pulleys 241, 24, and then fixed to one end 29 of the spiral spring 28 by the common fitting 27. .

The fixed side of the helical spring 28 is provided with a guide pipe 30 having a length approximately equal to the adjustment stroke of the spring and fitting loosely around the outer diameter of the spring, and the end 38 of the spring 28 is connected to the guide pipe 30 directly or between Fix this guide pipe 3
0 is fixed to the spring mounting part 31.

At the fixed end between the guide pipe 30 and the spring end 38, the threaded part 33 of the threaded rod is inserted into the inner diameter of the spring and supported by the threaded support part 32, and the adjustment knob 36 provided on the rod part 34 of the threaded rod is rotated. Therefore, when the threaded portion 33 is screwed and inserted into the inner diameter side of the spring 28, the spring at the inserted portion cannot be expanded or contracted, and therefore the effective number of turns of the spring is reduced accordingly.

Therefore, the spring constant K becomes variable.

In other words, if the load on the spring is P, then δ: displacement d; wire diameter G; elastic modulus D; coil diameter n; number of turns; It is clear that is variable.

Next, in order to indicate the displacement position of the stroke due to the rotation of the threaded rod, as shown in FIG. can be displayed.

In this case, the display board 31 is fixed to the fixing part 35 and the guide pipe 30, and a hole is made in the display board near the end of the guide pipe 30 and the end 38 of the spring 28 is locked.

In this case, the spring end 38 is fixed to the guide pipe 30 via the display plate 31, but it goes without saying that it may be fixed directly to the guide pipe 30.

As explained above, according to the present invention, the spring end is fixed to the end of the guide pipe that fits loosely around the outer diameter of the spring, and the guide pipe is fixed to the spring mounting part. By inserting a threaded rod suitable for the inner diameter of the spring from the spring end, the effective number of turns of the spring can be varied, and as a result, the spring constant K can be varied.

In this way, there is no need to attach and detach multiple springs as in the past, and by inserting a screw into a single spring, the spring constant can be varied continuously rather than stepwise, making it simple and effective. You can expect good results.

[Brief explanation of the drawing]

Figure 1 is a variable spring constant mechanism used in a conventional folding device, and Figures 2a and 2b are explanatory diagrams showing the configuration of an embodiment of the present invention. In the figure, 20 is a paper holder, 21 is an L-shaped base. Board, 22 is paper, 23, , 232 is hanging fitting, 24, , 24, 26
is a pulley, 251 and 25 are wires, 27 is a common metal fitting, 2
8 is a spiral spring, 30 is a guide pipe, 31 is a spring mounting portion, 32 is a screw support portion, 33 is a threaded portion, 34 is a rod portion, 3
5 is the same fixed part, 36 is an adjustment knob, 31 is a display board, 38
39 indicates the spring end, and 39 indicates the pointer.

Claims (1)

[Claims] 1. In a paper folding device in which a paper cradle is suspended by a spiral spring whose tension is balanced according to the amount of paper stacked, and the paper is folded and stored in the paper cradle, the paper cradle is fitted to the outside diameter of the spiral spring with some clearance. A guide pipe is provided to fix the end of the helical spring to the end of the guide pipe, and a threaded rod is provided that is inserted from the end of the helical spring and screwed into the inner diameter side of the helical spring. A spring constant variable mechanism for a paper folding device, characterized in that the effective number of turns of the helical spring is changed by rotating the threaded rod.