JPH0581505B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a nip roller device for conveying sheet-like materials such as synthetic resin films and fabrics.

(Prior Art) Generally, when conveying a sheet-like material such as a synthetic resin film or cloth, a receiving roller is rotatably attached to a machine base and rotated by a drive device such as an electric motor or a speed reducer. A nip roller device is used, which includes a nip roller rotatably attached to a bearing installed vertically on a machine base so as to be vertically movable, and a fluid cylinder that moves the bearing up and down.

(Problem) In such a nip roller device, a stopped nip roller is brought into contact with a rotating receiving roller, and the nip roller is rotated by the rotational force of the receiving roller. The roller slips until it synchronizes with the rotational speed of the receiving roller, causing problems such as scratches and wear on the surface of the roller.

(Objective) An object of the present invention is to prevent scratches, wear, etc. from occurring on the nip roller.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the nip roller device of the present invention includes a receiving roller that is rotatably mounted on the machine base and rotated by a drive device, and a receiving roller that is freely movable on the machine base. A nip roller that is installed in
In a device comprising an auxiliary drive roller that is rotated at substantially the same speed as the receiving roller before contacting the receiving roller, the auxiliary driving roller is separated immediately before the nip roller contacts the receiving roller. In addition, by driving the auxiliary drive roller with an electric motor via a one-way clutch, it is possible to prevent abnormal driving force from acting on the electric motor even if the nip roller comes into contact with the roller at a speed higher than that of the electric motor. can do.

(Example) The entire configuration of the nip roller device of the present invention is explained in the first example.
The details of the Z portion in FIG. 1 are shown in FIG. 2, and the side view thereof is shown in FIG. 3, and the explanation will be given based on the drawings.

A receiving roller 2 is rotatably attached to a bearing 3 on the machine stand 1, and is rotated at a predetermined speed by a driving device (not shown) such as an electric motor or a speed reducer.
Reference numeral 4 denotes a bearing mounted so as to move up and down in the vertical direction along a guide portion 16a formed on a support frame 16 on the machine stand 1, and a nip roller 5 is rotatably mounted thereon. A metal driven roller 6 is integrally attached to the end of the nip roller. A fluid cylinder 7 is vertically attached to a support frame 16 on the machine base 1, and a bearing 4 is attached to the piston rod. A pressure fluid supply pipe (not shown) having a switching valve is connected to the fluid cylinder 7. When the piston rod protrudes, the nip roller 5 descends together with the bearing 4 and contacts the receiving roller 2 with a predetermined surface pressure. When the piston rod retracts, the nip roller 5 rises together with the bearing 4, and the nip roller 5 moves downward against the receiving roller 2. turn away from 8 is a shaft body integrally attached to the bearing 4, and a bracket 9 is attached thereto. Reference numeral 10 denotes a movable body that is attached to move vertically up and down along a guide portion 9a formed on the bracket 9, and is constantly pressed downward by a spring 11.
A one-way clutch 12 and an electric motor 13 are attached to the movable frame 10 in a horizontal state, and an auxiliary drive roller 14 is attached to the output shaft of the one-way clutch 12.
is installed. The electric motor 13 uses a pulse motor, a synchronous motor, or the like. Further, the auxiliary drive roller 14 is driven by the driven roller 6 by the spring 11.
is in contact with a predetermined surface pressure. 15 is a screw body screwed onto the movable body 10, as shown in FIG.
Immediately before the nip roller 5 contacts the receiving roller 2, it contacts a stopper 17 attached to the support frame 16, stops the auxiliary drive roller 14 together with the movable body 10 at that position, and removes the auxiliary drive roller 14 from the driven roller 6. Separate.

When conveying a sheet by the above-mentioned nip roller device, the piston rod of the fluid cylinder 7 is retracted to raise the nip roller 5 to a predetermined position. In this state, a drive device (not shown) is operated to rotate the receiving roller 2 at a preset speed. The electric motor 13 is operated to rotate the nip roller 5 together with the driven roller 6 by the auxiliary drive roller 14. When the sheet material is placed over the receiving roller 2 in this state, the pressure fluid supply path is switched, the piston rod of the fluid cylinder 7 is projected, and the nip roller 5 is lowered together with the bearing 4. When the nip roller 5 moves to just before it contacts the receiving roller 2, the screw body 15 contacts the stopper 17 and the movable body 10
At the same time, the auxiliary drive roller 14 is stopped at that position. On the other hand, since the nip roller 5 descends until it comes into contact with the receiving roller 2, the auxiliary drive roller 14 separates from the driven roller 6, and the driving of the nip roller 5 by the auxiliary drive roller 14 ends. Then, the nip roller 5 presses the sheet material against the receiving roller 2 with a predetermined surface pressure while rotating at substantially the same speed as the rotational speed of the receiving roller 2, and is driven by the receiving roller 2, and the sheet is Convey the object while holding it in place. When the above-mentioned auxiliary drive roller 14 separates from the driven roller 6, the electric motor 13 stops.

After the conveyance operation of the sheet material is completed, the pressure fluid supply path is switched, the piston rod of the fluid cylinder 7 is retracted, and the nip roller 5 is raised together with the bearing 4. Then, when the nip roller 5 rises to a predetermined position, the screw body 15 separates from the stopper 17, and the auxiliary drive roller 13 comes into contact with the driven roller 6 due to the action of the spring 11. At this time, the driven roller 6 is rotating together with the nip roller 5 due to inertia, and the auxiliary drive roller 14 is in a stopped state or the electric motor 13 is activated and the receiving roller 2 is rotated.
The speed is almost the same. If the rotation speed of the auxiliary drive roller 14 is slower than the rotation speed of the driven roller 6, the auxiliary drive roller 14 will be driven by the driven roller, but if the auxiliary drive roller 14 is installed between the auxiliary drive roller 14 and the electric motor 13, the auxiliary drive roller 14 will be driven by the driven roller. No rotational force is transmitted to the electric motor 13 by the one-way clutch 12 which is engaged.

Although the embodiment described above is a double-sided nip roller device, it can also be applied to a cantilever type nip roller device.

(Effects of the Invention) The nip roller device of the present invention includes a receiving roller that is rotatably mounted on a machine base and rotated by a drive device, and a receiving roller that is movably installed on the machine base and applies a predetermined surface pressure to the receiving roller. The Nitz Pro roller rotates in contact with the
Before bringing the nip roller into contact with the receiving roller,
In a device consisting of an auxiliary drive roller that rotates at approximately the same speed as the receiving roller, the auxiliary drive roller is configured to be separated immediately before the nip roller contacts the receiving roller, so the nip roller may be scratched or It is possible to prevent wear from occurring.

In addition, by driving the auxiliary drive roller by the electric motor via a one-way clutch, even if the nip roller comes into contact with the roller at a rotational speed higher than that of the auxiliary roller, an abnormal driving force is not applied to the electric motor. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing one embodiment of the nip roller device of the present invention. FIG. 2 is a schematic side view of FIG. 1. FIG. 3 is an enlarged sectional view of the Z section in FIG. 1. Figure 4 is Y-Y in Figure 2.
It is an arrow view. 1: Machine base, 2: Support roller, 3, 4: Bearing,
5: Nip roller, 6: Driven roller, 7: Fluid cylinder, 8: Shaft, 9: Bracket, 10: Movable body, 11: Spring, 12: One-way clutch, 13: Electric motor, 14: Auxiliary drive roller, 1
5: Screw body, 16: Support frame, 17: Stopper.

Claims (1)

[Scope of Claims] 1. A receiving roller rotatably mounted on the machine base and rotated by a drive device; and a receiving roller movably installed on the machine base and rotating while abutting the receiving roller with a predetermined surface pressure. In a device comprising a nip roller and an auxiliary drive roller that rotates the nip roller at substantially the same speed as the receiving roller before it contacts the receiving roller, the auxiliary drive roller is rotated immediately before the nip roller contacts the receiving roller. A Nitzpro roller device characterized in that it is configured to be separated. 2. The nip roller device according to claim 1, wherein the auxiliary drive roller is driven by an electric motor via a one-way clutch.