JPS623068B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll sheet feeding device that feeds a roll sheet in one direction.

In multi-color label printing equipment, a roll sheet is intermittently fed for a certain length, and printing or die cutting is performed when the sheet is stopped, but when the sheet is moved, it may meander or Alternatively, if the feed amount is inaccurate, printing or die cutting may occur, so it is necessary to accurately convey the sheet by a predetermined dimension without meandering.

By the way, conventionally, a feed roller is placed at the bottom of a printing device or a die-cutting device, a plurality of presser rollers are brought into contact with the feed roller, and the feed roller is rotated to pull the sheet inserted between both rollers. Because a feeding method is adopted, the sheets often meander due to differences in the contact pressure of the presser rollers to the feed rollers, etc., and it is necessary to apply a certain tension to the sheets. There is a drawback that slippage occurs between the sheet and the feed roller, and the amount of sheet feed is inaccurate.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide a feeding device that can transport a rolled sheet without meandering.

The structure of the present invention is that a presser roller is brought into contact with the outer periphery of a feed roller that is driven to rotate in one direction intermittently or continuously at a set angle, and vacuum rollers are arranged in parallel at a required distance from the feed roller. The vacuum roller is provided with a rotation transmission mechanism that transmits the rotation of the motor, and the rotation transmission mechanism includes a clutch that cuts off the rotation transmission when the load on the vacuum roller exceeds a set value.
rotating the feed roller to convey the roll sheet inserted between the feed roller and the presser roller;
The sheet is conveyed forward by taking up a dimension corresponding to the amount of movement of the sheet by rotating a vacuum roller.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, for example, a sheet feeding device of a printing device that prints a label on a roll sheet P in which printing paper B is adhered to one side of a strip of release paper A is explained. axis 1
The above-mentioned roll sheet P pulled out from 0 is passed onto a dancer roll 11 and inserted between a feed roller 12 and a presser roller 13 in contact with it,
Then it is pulled out horizontally and the vacuum roller 1 is pulled out horizontally.
The release paper A and the printing paper B are separated from each other at the position of the guide roll 16, and each paper A, B is It is adapted to be wound up on a winding shaft 17 and a second winding shaft 18.

Note that 40 is a feed roller that conveys the slack of the roll sheet P that occurs below the vacuum roller 14 forward.

An arm 20 is attached to the roller shaft 19 of the feed roller 12 via a one-way clutch (not shown), and the arm 20 and a drive wheel 21 that continuously rotates in one direction are connected by a rod 22, and the drive wheel By the rotation of 21, the feed roller 12 is intermittently rotated by a set angle in the direction of the arrow in FIG.

The movement path of the roll sheet P extending horizontally from the feed roller 12 includes a first printing machine 23, a second printing machine
A printing press 24 and a die-cutting device 25 are provided, and each printing press 23, 24 and die-cutting device 25 are configured to operate when the roll sheet P is stopped.

Although the die-cutting device 25 may be of a full-cut type, in the embodiment, a half-cut type is shown, and is adapted to form cut lines of a desired shape only on the printing paper B.

The vacuum roller 14 located below the die cutting device 25 has a large number of suction holes 26 on its outer periphery, and suction force is applied to each suction hole 26 in the range blocked by the roll paper P. .

This vacuum roller 26 is rotationally driven by a motor 27. Any rotation transmission mechanism 30 for transmitting the rotation of the rotating shaft 28 of the motor 27 to the vacuum roller 14 can be adopted, and here, a transmission mechanism consisting of a sprocket chain is shown. A clutch 31 is incorporated in this rotation transmission mechanism 30, and the clutch 31 is adapted to interrupt rotation transmission when the load in the rotational direction applied to the vacuum roller 14 exceeds a set value. A powder clutch exists as such a clutch 31.

The printing device shown in the embodiment has the above structure,
This device intermittently feeds a roll sheet P extending horizontally between both rollers by a fixed length by intermittent rotation of a feed roller 12 and rotation of a vacuum roller 14, and when the roll sheet P stops, each printing machine 23, 24 and die-cut by a die-cutting device 25 to form release paper A and printing paper B.
are wound up on respective winding shafts 17 and 18.

Now, when the feed roller 12 is rotated intermittently and the motor 27 is driven to rotate the vacuum roller 14, the roll sheet P is sent forward by the rotation of the feed roller 12, and at the same time, the vacuum roller 14 also moves the roll sheet P forward. Therefore, there is no slack in the rolled sheet P between the feed roller 12 and the vacuum roller 14, and when the feed roller 12 rotates at a set angle and stops, the tension of the rolled sheet P is increased by the rotation of the vacuum roller 14. Become stronger, the above vacuum roller 1
4 exceeds a set value, the clutch 31 is disengaged and the vacuum roller 14 is stopped. Therefore, the rolled sheet P is conveyed forward by a distance corresponding to the amount of rotation of the feed roller 12, and the sheet P sent out by the feed roller 12 is pulled by the rotation of the vacuum roller 14. Since the sheet P does not meander and a certain tension can be applied to the sheet P, extremely clear printing can be performed.

In the case of the embodiment, the feed roller 12 was rotated intermittently to intermittently convey the roll sheet P forward for a fixed length, but the feed roller 12 was rotated continuously in one direction to convey the roll sheet P intermittently. It may be conveyed continuously at a constant speed. Further, the roll sheet P is not limited to a two-layer structure, but may have a three-layer structure, and the sheet may be made of paper, plastic, copper, aluminum plate, or the like.

As described above, in this invention, the roll sheet is sent out by the rotation of the feed roller, and the sent out roll sheet is pulled by the rotation of the vacuum roller. The sheet can be conveyed linearly without meandering. Also,
When the load in the rotational direction on the vacuum roller exceeds a set value, the vacuum roller stops, so the tension of the sheet between both rollers can be maintained constant, and when the feed roller is rotated intermittently at the set angle, The roll sheet can be accurately conveyed by a dimension corresponding to the rotation angle of the feed roller.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a feeding device according to the present invention, and FIG. 2 is a perspective view showing a rotation transmission mechanism of the vacuum roller. 12...Feed roller, 13...Press roller, 1
4...Vacuum roller, 27...Motor, 30
...Rotation transmission mechanism, 31...Clutch.

Claims (1)

[Claims] 1. A presser roller is brought into contact with the outer periphery of a rotationally driven feed roller, a vacuum roller is arranged in parallel with the feed roller at a required interval, and a rotation drive motor is placed between the rotation drive motor of this vacuum roller and the vacuum roller. 1. A roll sheet feeding device, characterized in that a transmission mechanism is provided, a clutch is built into the rotational transmission mechanism, and the clutch is configured to break when the load on the vacuum roller exceeds a set value.