JPS6366058A - Feeding control method for roll paper at its ending part - Google Patents

Abstract

PURPOSE:To have sure transportation when the tail of a paper roll is approached by furnishing a near end mark in the neighborhood of paper roll, and controlling paper feeding operation thereafter on the basis of information given by a sensor to sense this mark. CONSTITUTION:The leading edge of a paper roll 10 is drawn out of a magazine 20 and engaged with a roll 30, and after transporting a certain length in accordance with the paper feed information, the paper is cut 40 into specified size and supplied to a specified part. Here the roll paper 10 is equipped with a near end mark 50 and intermediate marks 51, 52 in order to sense the length information. When the near end mark 50 is sensed with progress of feeding of paper roll 10, such control shall be made that automatic correction is made for numerical values in memory when any error is sensed in the length L4. When near end mark 50 is sensed, a quite new control is commenced regardless of the numerical values in memory.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for controlling the supply of 9-rubever, such as roll-shaped photographic light-sensitive materials (color paper in #) used in photographic printers and the like.

More specifically, the present invention relates to a method of detecting the usage amount (remaining Ik) and controlling the supply operation after the state approaches the end.

[Background of the Invention] In order to notify that the end of a roll paper is near, for example, in the case of facsimile paper, a warning color is printed on the back side, or a through hole is provided to mark the near end. Detection is being done. Even in this case, it is not common practice to specifically control paper feeding by simply notifying the operator of nearland and prompting him to replenish paper.

In the case of roll-shaped photosensitive materials (especially color paper, etc.), the amount of paper used is simply detected by length, and paper feeding is not specifically controlled near the end of the paper using near-end marks, etc. do not have.

Unlike the method in which the roll paper is pulled out from the magazine and transported to the exposure/development section and then finally cut, this method cuts the roll paper to a specified size and then transports it to the exposure section, etc.

In particular, cut only the portions of different sizes, such as A2 and A3, from the same roll paper!・In cases where the paper is supplied in a paper supply system, or where the magazine is replaced frequently and overlapping portions are generated that must be discarded each time, even if the amount of paper used is detected moment by moment by a sensor, the end of the paper may not be detected. The error increases as it approaches , and in extreme cases, the remaining amount becomes unknown, making it difficult for the operator to plan the work.

In addition, if the end of the roll paper is fixed to the winding core in the magazine, if the conveyance system continues to operate even after reaching the end, tension will suddenly occur.
The transport system and magazine may be damaged.

[Object of the invention] The present invention was created in view of the above, and detects and notifies that the remaining amount of roll paper approaches the end,
The main purpose is to clarify the method of controlling the subsequent operation of the conveying system, and other objects and advantages of the present invention will become apparent from the following description.

Means for Solving Problem E] The above object of the present invention is to cut a roll paper pulled out from a magazine into a certain length and convey it to a processing section, in which a near-end mark is placed at a certain position near the end of the paper. This is achieved by a paper feeding control method near the end of a roll paper, characterized in that the following paper feeding operation is controlled based on information detected by a sensor about the mark.

[Example] The details of the present invention will be explained below with reference to the drawings.

In Fig. 1, numeral 10 is a roll paper such as color photosensitive material. ! ! It is housed in a magazine 20 indicated by a line. The tip of the roll paper 10 is slightly pulled out from the magazine and engaged with the roll 30 of the conveyance system,
The sheet is pulled out by a certain length according to the paper feed information, cut 40 into a specified size whose length is detected from the amount of rotation of the roll, etc., and then supplied to an exposure unit or the like.

In this type of paper feeding device, there is an error in length L4 between the length L of the actually used paper and the length detected by the sensor due to magazine replacement, etc., as shown in Ll-L3. L4 +L5 is the actual remaining amount.

Therefore, since the value of L5 is constant, if L4 is positive, the paper feed control system is underestimating the remaining amount, and if L4 is negative, it is overestimating the remaining amount. become.

Marks 50, 51, and 52 are marks for detecting the length information of the roll paper, and are formed from simple positional information such as through holes and unevenness, and meaningful information such as a printed bar code.

50 is a near-end mark, which is prepared at a certain length position near the end of the roll paper 10, and is used to check the discrepancy between the actual paper usage amount and the input usage information and correct the value. (
Intermediate) marks 51 and 52 may be prepared.

(Intermediate) In the case where marks 51.52 are prepared, the length information detected by the control system is the mark 51.5'
It is corrected by the detection information in step 2, and can be made closer to the actually used ML. However, if the magazine is replaced after the final mark 52 has already been passed, an error may occur in the length L3 + L4 up to the near end mark 50.

Now, when the conveyance of the roll paper 10 progresses and the near-end mark 50 is detected, the control (display) system operates in the following manner.

The first aspect is when an error is detected in the length of L4,
It automatically corrects and controls the memorized values.

The second mode is a method in which when the near end mark 50 is detected, a completely new R;A is started regardless of the stored numerical value. In the latter case, if the usable length (Ls) from the position of the near-end mark 50 to the end is constant, Ls will be equal to mLs sent out just before the near-end mark is detected, regardless of the total length of the roll paper and the amount used. The transport system can always be controlled according to the terminal control program by adding the value.

Furthermore, when the near-end mark 50 is detected, the operator is notified by light, sound, etc. that the end has been approached. In this case, it is preferable that the remaining amount is displayed not as a length but as the number of sheets of a particular size that can be used.

Compare the length to the end and the length of a specific size paper,
If the former is small, the conveyance system will not operate and the operator will be notified of paper replenishment. The length to the end is determined from the stage when the near end mark 50 is detected.
r (La + Ls) - Since it is calculated from the formula of iJ that will be used later, if the value a is insufficient for the size of the paper instructed to be fed by the operator, the paper feeding operation will not be performed, but only one sheet will be fed. If it is possible to feed paper depending on the size, for example, paper replenishment notification for A2.

For A3, a message indicating that there is 1 sheet remaining is displayed.

If there is a paper shortage for all sizes of paper, another paper replenishment notification may be made.

"Effects of the Invention" According to the present invention, by correcting the detected numerical value of the paper feed amount that has already been input using a near-end mark placed at a constant length position near the end of the roll paper, or
By newly activating the end control system, it is possible to reliably control the conveyance operation and display near the end of the paper, and it is possible to achieve the above-mentioned purpose.

[Brief explanation of the drawing]

Figure fJS1 is a detailed explanatory diagram of the present invention. In the figure, each symbol indicates the following. lO: Roll paper 20: Magazine 30: Conveyance roller 40: Cutting teeth 50:27 end mark 51: (middle) mark 52: (middle) mark

Claims (3)

[Claims] (1) In machines where rolled paper pulled out from a magazine is cut into a certain length and transported to the processing section, a near-end mark is provided at a certain position near the end of the paper, and the information detected by the sensor is used to determine the subsequent feeding. A method for controlling paper feeding near the end of a roll paper, the method comprising controlling paper movement. (2) Paper feeding control near the end of the roll paper according to claim 1, characterized in that the paper feeding control near the end of the roll paper is performed by correcting the used amount information of the paper stored in the control system based on the detection information of the near end mark. Method. (3) A patent claim characterized in that a separate control system for supplying paper near the end starts operating in accordance with near-end mark detection information, regardless of the used amount information of paper stored in the control system. A method for controlling paper feed near the end of a roll paper according to item 1.