JPS5842340Y2 - Brake for rewinding roll sheet - Google Patents

Description

[Detailed description of the invention] The invention is characterized in that a substantially constant braking force is applied at all times in response to changes in the roll diameter of roll sheets, such as wrapping paper used in automatic packaging machines. That is.

When unrolling a rolled sheet one by one from the end, as the roll diameter of the sheet gradually becomes smaller and the weight of the sheet becomes lighter, the inertial force also becomes smaller. Therefore, if the braking force on the sheet is gradually reduced, There is a drawback that the elongation rate of the sheet changes.

Various proportional brakes have been provided in the past, but these have disadvantages such as low proportional braking force accuracy and complicated structures.

In view of the above points, the present invention provides a means for achieving a simple proportional structure and high proportional accuracy of braking force.

An actual case of the present invention will be explained below based on the drawings.

In the drawing, a roll sheet 1 is wound around a cylindrical core material 2, and both ends of the core material 2 are supported via a rotatable shaft 3 on a support shaft 5 whose one end is fixed to a frame 4. .

In the drawing, the rotatable shaft 3 is composed of a pair of annular bodies, so it seems a bit far from the image of a rod-shaped shaft, but it is the shaft 3 that supports the roll sheet 1. There is no doubt that a circular brake plate 6 is fixed to one end of the shaft 3.

On the other hand, a clamping member 7 is provided in a state where it crosses the shaft 3.

The member 7 has a bifurcated shape as shown in FIG. 1, and is arranged so as to straddle the brake plate 6.

Further, as shown in FIG. 2, the lower half of the pressing member 7 has an elongated annular shape to form an elongated annular portion 8, and the shaft 3 is disposed within the elongated annular portion 8.

Approximately the upper half of the pinching member 7 is supported by a sheath 9 fixed to the frame 4.

The elongated ring portion 8 and the sheath 9 each restrict the rotation of the pinching member 7, and also serve as guide elements for vertically displacing the member I.

Furthermore, a roller is rotatably supported on a pin 10 protruding from the upper area of the pinching member 7 to form a hook element 11, and the hook hooks the element 11 onto the upper surface of the roll sheet 1, and The roll sheet 1 supports a load of 7.

Furthermore, a bolt 12 is passed through the lower end of the clamping member 7, a nut 13 and a spring 14 are provided on the bolt 12, and the nut 13 is rotated to provide the clamping member I with a spring action by the spring 14. The friction material 15.15 provided on the inner surface of the clamping member 1 is pressed against both surfaces of the brake plate 6 by the action.

The present invention is constructed as described above, and its operation will be explained below.

The clamping force of the clamping member γ that clamps the brake plate 6 corresponds to the repulsive force of the spring 14, and by adjusting the repulsive force of the spring 14 with the nut 13, the clamping pressure itself is adjusted.

Therefore, by keeping the repulsive force of the spring 14 constant, the friction materials 15 and 1 against the brake plate 6 are
5 can be kept constant, and a braking force corresponding to the frictional force can be applied to the rotational force of the roll sheet 1 via the brake plate 6.

Therefore, by continuously pulling and rewinding the end 1a of the roll sheet 1 in the direction of arrow A, the roll sheet 1
The diameter of the roll sheet 1 gradually decreases, but as the diameter of the roll sheet 1 decreases, the clamping member 7, which is hooked on the upper surface of the roll sheet 1 and supports the load via the element 11, naturally collapses due to its own weight. descend.

In this case, the rotation of the clamping member I is restricted by the guide element 8.9, and it is displaced straight down.

Therefore, the contact position (brake application point) of the friction material 15.15 with respect to the brake target plate 6 moves toward the center of the brake target plate 6 as the diameter of the roll sheet 1 changes.

In the illustrated embodiment, the clamping member γ is
However, since the pinching member 7 is bifurcated, it is also possible to utilize the unique spring action of the pinching member 7.

As mentioned above, in the present invention, a circular plate to be braked 6 is fixed to a rotatable shaft 3 that supports a roll sheet 1, and a bifurcated pressing member 7 is arranged so as to straddle both sides of the plate to be braked 6. Then, a spring action provided in the clamping member I clamps a part of the plate 6 to be braked, and the clamping member I
is supported by the guide element so as to be vertically displaceable, and the hook provided on the pinching member 7 supports the load of the pinching member I on the upper surface of the roll sheet 1 via the element 11. As the diameter of the roll sheet 1 becomes smaller, the point of braking of the clamping member 7 on the plate 6 to be braked automatically moves toward the center of the shaft while keeping the clamping pressure constant.

As the diameter of the re-rolled sheet 1 gradually decreases and the inertia force decreases accordingly, the braking point can be moved in the axial direction to proportionally decrease the braking force.

In particular, instead of changing the frictional force in response to changes in the diameter of the roll sheet 1, the frictional force is constant 1x and only the braking point is moved according to the roll diameter using its own weight. Therefore, the structure is simple and the proportional accuracy of the braking force is high.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a previous view taken along the line ■-■. DESCRIPTION OF SYMBOLS 1... Roll sheet, 3... Rotatable shaft, 6... Brake plate, 7... Squeezing member, 8...・Long ring part (guide element), 9...
...sheath (guiding element), 11... tension is an element.

Claims (1)

[Scope of utility model registration request] A circular plate to be braked 6 is fixed in a brim shape to one end of a shaft 3 which supports the roll sheet 1 in the shape of a horizontal shaft and is freely rotatable together with the roll sheet, while a bifurcated clamping member I is attached to the plate to be braked. The shaft 3 on the brake plate 6 is arranged so as to straddle both sides of the brake plate 6, and the spring action of the clamping member 7
The upper part of the clamping member 7 is supported by a guide element so as to be vertically displaceable, and the hook provided on the clamping member 7 is connected to the clamping member 7 via an element 11. A brake for unwinding a roll sheet, which is configured to support the load of 1 on the upper surface of the roll sheet 1.