JPH01308342A - Roll-out device for sheet-shaped object - Google Patents

Abstract

PURPOSE:To prevent a sheet-shaped object from breaking smoothly restarted in its roll out preventing the sheet-shaped object from loosening by mounting a looseness preventing elastic member to be interposed between a rewinding shaft, mounting a sheet-shaped object rewinding member, and a braking means. CONSTITUTION:A sheet-shaped object rewinding member 20 turnably supports its roll-out shaft 2 by a machine frame 1. The roll-out shaft 2 is connected to a drive shaft 3 through a clutch 10 and an elastic member 9. The machine frame 1 rotatably supports the drive shaft 3, and its rotation is transmitted from pulleys 5, 6 and a belt 7 driven by an electric motor 4. A sheet-shaped object, when it is drawn out, a given tension by placing a disk brake 8 in an inoperative condition and rotating the electric motor 4 so as to generate rotary braking torque. When roll-out action is stopped, the disk brake 8 fixes the drive shaft 3, and when the sheet-shaped object generates looseness, the elastic member 9 reversely rotates the roll-out shaft 2 absorbing the looseness. In this way, when a sheet restarts its roll-out, the roll-out action is smoothly restarted preventing the sheet from breaking.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an unwinding device that unwinds a sheet-like material such as a synthetic resin film or paper under a predetermined tension.

(Prior art and its problems) Generally, when unwinding a sheet-like material such as a synthetic resin film or paper for quality inspection or surface treatment, or when cutting a wide sheet into multiple narrow sheets, An unwinding device is used, which is composed of an unwinding shaft to which a sheet-like material is attached, and a braking means attached to the unwinding shaft. The braking means is designed to operate when the brake is applied.

In the above-mentioned unwinding device, during the unwinding operation of a sheet-like material such as a very thin synthetic resin film or a synthetic resin film with a large elastic deformation rate, the unwinding of the sheet-like material is stopped midway through the unwinding operation. In some cases, even if the braking means is activated to fix the unwinding shaft while applying a predetermined tension to prevent the sheet from loosening, the sheet may stretch in a short period of time and cause the sheet to loosen. arise.

Therefore, if you start unwinding the sheet with the sheet loosened, tension may be applied to the sheet and the sheet may be cut. A problem arose in that the device moved away from the detection section of the detection device, causing it to malfunction.

(Objective) It is an object of the present invention to solve the above-mentioned problems and provide an unwinding device that does not cause slack in the sheet-like material even if the unwinding of the sheet-like material is stopped midway. be.

(Means for Solving the Problems) That is, the present invention provides a sheet-like material unwinding device in which a braking means is disposed between an unwinding shaft on which a sheet-like material winding body is mounted and a drive means. By connecting the output shaft and the braking means with an elastic member for preventing slack, the slack of the sheet-like material is absorbed.

(Example) The structure of one example of the unwinding device of the present invention will be described based on the drawings.

Reference numeral 2 denotes an unwinding shaft rotatably installed in the machine frame 1, on which a winding body 20 of synthetic resin film, paper, etc. is mounted. Reference numeral 3 denotes a braking shaft rotatably mounted on the machine frame 1 and connected to the unwinding shaft 2 via an elastic member 9.

Reference numeral 4 denotes an electric motor for applying tension, which is a braking means, and transmits rotation to the braking shaft 3 via a pulley 5.6 and a belt 7. 8 is a disc brake that fixes the braking shaft 3 in a stopped state, and an electromagnetic powder brake, an air brake, or the like can be used. In addition, if the electric motor is equipped with such a braking mechanism, it is not necessary to install the above-mentioned brake.The elastic member 9 may be made of synthetic rubber or a member having torsional elasticity such as a coil spring. If the hardness of the synthetic rubber forming the elastic member 9 is too high, the amount of elastic deformation will be small, and if it is too low, the amount of deformation will be large, but the strength and durability will be lost. Therefore, when unwinding a sheet-like material, if the wound material has the minimum diameter, even if the sheet-like material is loosened by about 1 am or more in the anti-unwinding direction, the predetermined tension cannot be applied. Either the elastic member should be selected to have an elastic force that is sufficient for the tension to act, or the torsional spring constant (K) of the elastic member should be such that K < T x R (hgf, am/
rad) T: Tension of the unwound sheet (dazzle f) R: Radius of the unwound sheet (■).

10 is a clutch for removing the unwinding shaft 2 from the machine frame 1.

The elastic member 9 described above can also be configured as a member such as an engagement/disengagement portion of the clutch 10.

In the above-mentioned unwinding device, when unwinding a sheet-like material,
With the disc brake 8 inactive, the sheet-like object is pulled out by an electric motor (not shown) for transporting the sheet-like object. At this time, the electric motor 4 is rotated to generate regenerative braking torque to convey the sheet-like object. Apply a predetermined tension.

When stopping the unwinding of the sheet-like material, the electric motor (not shown) for conveying the sheet-like material is stopped, and then the disc brake 8 is activated to fix the braking shaft 3. At this time, a predetermined tension is applied to the sheet-like material.

When the sheet material stretches in this state, the tension decreases and the torsional force acting on the unwinding shaft 2 becomes smaller, so the restoring force of the elastic member 9 causes the sheet to unwind counterclockwise. The shaft 2 is rotated and the sheet material is tensioned.

Therefore, the unwinding shaft 2 is rotated counterclockwise by the amount of elongation of the sheet-like material to unwind the sheet-like material, thereby preventing the occurrence of slack.

(Effects of the Invention) As described above, the present invention provides a sheet-like material which is rotatably installed in a machine frame and has a braking means between the unwinding shaft on which the sheet-like material winding body is attached and the driving means. In the unwinding device, by connecting the unwinding means through an elastic member for preventing loosening, even if the sheet-like object stretches, the unwinding shaft is moved in the opposite direction to that during unwinding due to the restoring force of the elastic deformation of the elastic member. The sheet-like material is rewound by being rotated in the direction of , without causing any slack, and it is possible to prevent the sheet-like material from being cut when unwinding is started, or from malfunctioning of the end face position detector.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing one embodiment of the sheet-like material unwinding device of the present invention. FIG. 2 is a view taken along the arrow 2 in FIG. 1. FIG. 3 is an enlarged sectional view of the elastic member. 2: Unwinding shaft 3: Braking shaft 4: Electric motor 8: Disc brake 9: Elastic member Applicant Toray Engineering Co., Ltd. Figure 2 Figure 3

Claims (1)

[Claims] In a sheet-like material unwinding device in which an unwinding shaft for mounting a sheet-like material winding body and a braking means are arranged, the unwinding shaft and the braking means are connected via an elastic member for preventing loosening. Characteristic sheet-like material unwinding device.