JPS59190148A - Roll sheet feeding device - Google Patents

Abstract

PURPOSE:To have transport of roll sheet free of meandering, by receiving the sheet sent off by a feed roller with a vacuum roller, and by shutting the rotary transmission if the load to this vacuum roller has exceeded a certain specific value. CONSTITUTION:When a feed roller 12 is rotated, a roll sheet P is sent off, and at the same time a vacuum roller 14 conveys the sheet P, so that the sheet P will be free of slackness. When the roller 12 turns for a certain specific angle, rotation of the roller 14 will strengthen the tension of the sheet P, and if the load to the roller 14 has exceeded a specified set value, a clutch 31 is disengaged to cause stop of the roller 14. Accordingly the sheet P is transported in an amount corresponding to the rotational amount of the roller 12 as well as the sheet P sent off is drawn by the roller 14 rotating, so that the sheet P will not make any meandering motion, and further a constant tension can be imparted to the sheet P to ensure sharp printing.

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 a multicolor label printing device, a rolled sheet is intermittently fed for a certain length, and printing or die cutting is performed when the sheet stops (1). If the sheet is meandering or the feeding amount is incorrect, printing ridges or punching misalignment will occur, so be careful not to meander the sheet.
In addition, it is necessary to accurately convey only a predetermined dimension.

By the way, conventionally, a feed roller is placed at the bottom of a printing device or 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 this feeding method is adopted, the sheet often meanderes due to differences in the contact pressure of each presser roller to the feed roller, etc., and it is necessary to apply a certain tension to the sheet. 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 mechanism of the present invention is such that a pressure roller is brought into contact with the outer periphery of a feed roller that is moved intermittently or continuously at a set angle in one direction, and the pressure roller is moved at a predetermined distance from the feed roller. Vacuum rollers are arranged in parallel, and a rotation transmission mechanism is provided to transmit the rotation of the motor to the vacuum rollers.
A clutch is included in the rotation transmission mechanism to cut off the rotation transmission when the load on the vacuum roller exceeds the load, and the clutch is inserted between the feed roller and the presser roller to rotate the feed roller. A rolled sheet is conveyed, and a dimension corresponding to the amount of movement of the sheet is removed by rotation of a vacuum roller, and the sheet is conveyed forward.

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

As shown in the figure, for example, label printing is performed on a roll sheet P in which one side of a strip of release paper A is coated with printing paper B. The roll sheet P that has not been pulled out from the roll support shaft 10 is passed through the dungeon roll 11 and inserted between the feed roller 12 and the presser roller 13 in contact with it, and then pulled out horizontally to the vacuum roller 14. The release paper A and the printing paper R are separated from each other at the position of the guide roller 16, and the release paper A and the printing paper R are separated from each other at the position of the guide roller 16. , B are wound up by the first winding shaft 17 and the 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 shaft 21 that continuously rotates in one direction are connected by a rod 22. 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 24. and a die-cutting device 25 are provided, and each of the printing presses 23, 24 and the die-cutting device 25 is arranged to operate at a time 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 book is shown, and cut lines of a desired shape are formed 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 a suction force is applied to each suction hole 26 in the range covered by the roll paper P. ing.

This vacuum roller 26 is rotationally driven by a motor 27. Any arbitrary mechanism can be used as the rotation transmission mechanism 30 that transmits the rotation of the rotation shaft 28 of the motor 27 to the vacuum roller 14.

Here, a transmission mechanism consisting of a sprocket chain is shown. A clutch 31 is incorporated into this rotation transmission mechanism 30, and the clutch 31 interrupts rotation transmission when the load in the rotation direction applied to the vacuum roller 14 exceeds a set value. In this way, a powder clutch exists as the latch 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 intermittent rotation of a feed roller 12 and rotation of a vacuum roller 14, and when the roll sheet P is stopped, each printing press 23. to print, and cut out the mold by the mold cutting device 25 to form release paper A.
and printing paper B are each wound up on each winding shaft 17, 18.

Now, 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 rotates the roll sheet P.
There is no slack in the roll sheet P between the feed roller 12 and the vacuum roller 14 in order to convey the paper forward, and when the feed roller 12 rotates at a set angle and stops, the rotation of the vacuum roller 14 causes the roll sheet P to be conveyed forward. When the tension becomes strong and the load in the rotational direction on the vacuum roller 14 exceeds a set value, the clutch 31 is disengaged.
Vacuum roller 14 stops. Therefore, the rolled sheet P is conveyed forward by a dimension corresponding to the tachometer 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 constant tension can be applied to the sheet PI, 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. Continuous conveyance at a constant speed is allowed. The roll sheet P may have a two-layer structure (it may have a weight of A1 or a three-layer structure, and the sheet may be made of paper, plastic, copper, aluminum plate, etc.).

As described above, in this invention, the rolled sheet is fed out by the rotation of the feed roller, and the fed out rolled sheet is pulled by the rotation of the vacuum roller, so that the rolled sheet does not meander between the feed roller and the vacuum. First, the sheet can be conveyed linearly. If the load in the rotational direction on the vacuum roller exceeds a set value, the vacuum roller will stop, making it possible to maintain a constant sheet tension between both rollers and allowing the feed roller to rotate intermittently at the set angle. In this case, the roll sheet can be accurately conveyed by a dimension corresponding to the rotation angle of the feed roller.

[Brief explanation of drawings]

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 a vacuum roller. 12...Feed roller, 13...Press roller, 14.
...Vacuum roller, 27...Motor, 30...
Rotation transmission mechanism, 31...clutch

Claims (1)

[Claims] A presser roller is tangent to the outer periphery of the feed roller that is rotationally driven, and a vacuum roller is arranged in parallel with the feed roller at a required interval, and the vacuum roller's rotational drive motor and the vacuum A roll characterized in that a rotation transmission mechanism is provided between the roller and a rotation transmission mechanism, and a clutch is incorporated in the rotation transmission mechanism, and the clutch is configured to be disconnected when the load maintained on the vacuum roller exceeds a set value. Sheet feeding device.