JPS62146869A - Roll paper feeding device - Google Patents

Abstract

PURPOSE:To eliminate the useless working and time in the processing of jammed paper by detecting the weight of the roll paper which is accompanied by the reduction of the roll paper and determining the roll paper supply stop time point, thus eliminating the feed of the roll paper shorter than a prescribed length. CONSTITUTION:The weight of a roll paper 1 in the case when the length of the roll paper 1 reaches a prescribed length is previously set by a roll paper limit weight setting means 10. The weight of the roll paper 1 in the case when the roll paper is fed is weighed by a roll paper weight sensor 9, and compared with a previously set weight, and it is judged if the length of the roll paper 1 is shorter than the prescribed length or not by a left paper quantity judging means 11. The operation of a roll paper feed driving means 8 is controlled on the basis of the result of the judgement by a roll paper feed control means 12. Therefore, when the length of the roll paper 1 becomes shorter than the prescribed length, supply is suspended, and therefore, the feed of the roll paper 1 shorter than the prescribed length is prevented, and the useless working and time such as for jammed paper processing, etc. can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a roll paper supply device in a lithographic printing original plate making machine, etc., for supplying roll paper wound into a roll.

PRIOR TECHNOLOGY In a conventional plate making machine for planographic printing, a long roll paper wound into a roll is rotatably supported by a spindle.
The outer peripheral edge of this roll paper is formed by a pair of rollers, etc.
2. Description of the Related Art A roll paper supply device is known in which a roll paper supply means is operated to feed out the roll paper, and the rolled paper is cut into a predetermined length by a roll paper cutting means. .

However, the conventional roll paper supply device detects the final end of the roll paper and stops driving the roll paper supply means, so the length of the final roll paper supplied by the roll paper supply means is may be shorter than the above-mentioned predetermined length, and the final roll paper is likely to jam during the plate-making process, resulting in wasteful work and time required to dispose of the jammed paper.

Purpose An object of the present invention is to provide a roll paper supply device that does not feed roll paper shorter than a predetermined length and does not require wasteful work or time such as processing jammed paper. .

Structure The present invention is characterized in that the weight of the roll paper when the length of the roll paper 1 reaches a predetermined length is set in advance by a roll paper limit weight setting means, and the weight of the roll paper at the time of supplying the roll paper is set in advance. is measured using a roll paper weight measuring means, and the set weight of the roll paper is compared with the measured weight of the roll paper. If the length of the sticker paper is shorter than the predetermined length, the roll paper remains. The present invention is characterized in that the supply of the roll paper is stopped when it is determined by the amount determining means.

EMBODIMENT OF THE INVENTION Below, one embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, a roll paper 1 is wound around a roll paper holder 2. As shown in FIG. This roll paper holder 2 is rotatably supported by a roll paper support shaft 3. This roll paper 1
The outer peripheral end 1a of the roll paper 1 is fed out from the roll paper holder 2 by a roll paper supply means 6 consisting of a pair of rollers through a roll paper path 5 formed by a pair of guide plates 4, and the roll paper 1 is cut into a predetermined length. It is guided to the roll paper cutting means 7. In this state, the roll paper supply means 6
When the roll paper 1 is driven by a roll paper supply drive means 8 consisting of a motor, a reduction gear (both not shown), etc., the roll paper 1 is fed in the direction of arrow a. When the roll paper is fed a predetermined length, the roll paper cutting means 7 is operated by the cutting drive means 7a, and the roll paper 1 is cut into a predetermined length. The cut roll paper 1 is used as a plate-making processing bag for a plate-making machine, for example! (not shown) by another feeding means.

On the other hand, the roll paper support shaft 3 is supported by a detection arm 9& of a roll paper weight sensor 9, as shown in FIG. This roll paper weight sensor 9 has a detection arm 9a.
]1tWx of the paper 1 supported by the paper roll (including the weight of the paper roll holder 2 and the paper roll support shaft 3)
This is a sensor for measuring. The roll paper weight sensor 9 is a so-called resistance wire strain gauge that measures a change in the weight of the roll paper 1 as a change in strain and further as a change in resistance by utilizing, for example, the phenomenon that resistance increases when a metal wire is stretched. It consists of

'The roll paper supply device configured as described above calculates the weight W1 of the sticker paper 1 when the length of the roll paper 1 reaches the predetermined length, as shown in FIG. 1, for example. The limit weight is set in advance by the limit weight setting means 10 (and the weight WX of the roll paper 1 at the time of supplying the roll paper is measured by the roll paper weight setter 9, and the set weight W1 and the measured weight WX are set in advance). and determining whether the length of the roll paper 1 is shorter than the predetermined length by the roll paper remaining amount determination means 11.

Based on this determination result, the operation of the roll paper supply drive means 8 is controlled by the roll paper supply control means 12.

Such control of the roll paper supply device is performed, for example, by a control device as shown in FIG.

In FIG. 5, information on the power key 13 for turning on the power of the roll paper supply device, information on the start signal generating means 14 for starting the feeding of the roll paper 1, and information on the roll paper weight sensor 9. are respectively given to the microcomputer 15. The output boat of the microcomputer 15 is connected to the roll paper supply drive means 8 and the cutting drive means 7a.

When the ON signal of the power key 13 is given to the microcomputer 15, the ROM of the microcomputer 15 is
The operation of the roll paper supply device is executed in accordance with the program shown in the flowchart of FIG. 4 stored in .

First, perform the initial settings in step ①. In this initial setting, the RAM and input/output ports of the microcomputer 15 are cleared. Next, in step ■, start signal generating means 1
The presence or absence of the start signal from step 4 is determined. If it is determined in step (2) that there is a start signal, the roll paper supply driving means 8 is turned on in step (2) and the roll paper 1 is fed.

Next, in step (2), the weight Wx measured by the roll paper weight sensor 9 is read, and in step (2), the relationship between the preset weight W1 and the weight Wx of the roll paper 1 measured by the roll paper weight sensor 9 is determined Wx ( It is determined whether or not W s.If it is determined in this step (2) that Wx<Wr is not true, that is, if the length of the roll paper 1 is longer than the predetermined length, then in step (2) the roll paper 1 is It is determined whether or not the roll paper 1 has been fed by a predetermined amount. Note that this feeding amount of the roll paper 1 is set in the ROM in advance, for example.

When it is determined in step (2) that the roll paper 1 has been fed by a predetermined amount, the roll paper supply drive means 8 is turned off in step (2), and the feeding of the roll paper 1 is stopped. Next, in step (2), the cutting drive means 7a is turned on and the roll paper cutting means 7 is activated.

After it is determined in step (2) whether or not the cutting of the roll paper 1 is completed, in step O, the cutting driving means 7a is turned off and the operation is stopped. On the other hand, in step ■ WX<
If it is determined that the length of the roll paper is Wl, that is, if the length of the roll paper is shorter than the predetermined length, the roll paper supply drive means 8 is immediately turned off in step (2), and then the operation is stopped.

Effect The roll paper supply device of the present invention stops the supply of roll paper when the length of the roll paper becomes shorter than a predetermined length, so that roll paper shorter than the predetermined length is not fed. There is no need for wasted work or time consuming, such as handling jammed paper.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an embodiment of the present invention, Fig. 2 is a partially cutaway side view of the above embodiment, Fig. 3 is a block diagram showing a control device of the above embodiment, and Fig. 4 is a diagram of the above embodiment. 3 is a flowchart for explaining the operation of FIG. 1. Roll paper, 2. Roll paper holder. 3... Roll paper support shaft 16... Roll paper supply means. 7.. Roll paper cutting means, 8.. Roll paper supply driving means, 9.. Roll paper weight sensor, 10.. Roll paper limit weight setting means, 11.. Roll paper remaining amount determination means, 12..
Roll paper supply control means.

Claims (1)

[Claims] a roll paper support shaft for rotatably supporting the roll paper;
A roll paper supply means for feeding out the outer peripheral end of the roll paper supported by the roll paper support shaft, a roll paper supply drive means for driving the roll paper supply means, and a roll paper supply means for feeding the rolled paper to a predetermined length. In the roll paper supply device having a roll paper cutting means for cutting the roll paper into strips, the weight of the roll paper when the length of the roll paper reaches the predetermined length is preset by the roll paper limit weight setting means. At the same time, the weight of the roll paper at the time of supplying the roll paper is measured by the roll paper weight measuring means, and the weight of the roll paper set by the roll paper limit weight setting means and the weight of the roll paper measured by the roll paper weight measuring means are measured. A roll paper remaining amount determining means determines whether the length of the roll paper is shorter than the predetermined length by comparing the weight of the rolled paper with the weight of the roll paper, and the roll paper remaining amount determining means determines whether or not the length of the roll paper is shorter than the predetermined length. A roll paper supply device characterized in that when the length of the roll paper is determined to be shorter than the predetermined length, the roll paper supply control means stops the operation of the roll paper supply drive means.