JPH0958911A - Automatic paper joining timing detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-accuracy automatic paper joining timing detecting device which minimizes errors, by providing an encoder connected to an infeed roller, and judging the total length of a reel on a winding roll in order for the encoder to generate a paster signal. SOLUTION: A winding roll 12 consists of an old reel 13 being rewound, while a winding roll 14 is waiting for paper joining. An automatic paper joining device 16 is provided with a brush 17 which presses an old reel 13 against the outer periphery of the winding roll 14 of a new reel to perform paper- joining, and a cutter 18 for cutting the old reel 13 after the completion of paper- joining. An encoder 22 generates a Z phase pulse signal each time a revolution of an infeed roller 20 is completed, and constantly calculates the remaining quantity of the reel based on the Z phase pulse signal. The encoder judges the time when the properly set remaining quantity of the reel is reached, as a paper joining timing to output a paster signal. In this manner, a high-accuracy automatic paper joining timing detecting device which extremely minimizes errors, is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic paper splicing device for a rotary press, and more particularly to improving the accuracy of an automatic paper splicing timing detection device.

[0002]

2. Description of the Related Art Conventionally, in a rotary press for printing by handling a web continuously rewound from a winding roll,
Immediately before the web of the take-up roll (old take-up paper) that is being rewound disappears, the web of the new take-up roll (new take-up paper), which has been separately waited, is automatically spliced to continue printing. For this reason, an automatic paper splicing device has been developed, but in this case, it is necessary to automatically obtain a command (paste signal) for splicing the paper just before the end of the old web. Generally, there is provided a winding diameter detection device that constantly detects the diameter D of the winding roll being rewound, and the winding diameter detected by this is the preset winding diameter immediately before the end of the winding paper. A means for outputting a pasta signal when the arrival time is used as a paper splicing timing is adopted.

Therefore, as a winding diameter detection device, it is actually fair.
The winding diameter measuring means using a distance sensor disclosed in Japanese Patent No. 6129 is applied. Here, the distance sensor irradiates measurement waves such as ultrasonic waves and light toward the shaft core of the winding roll from a reference position that is a predetermined distance L ₀ away from the shaft core of the winding roll, and reflects the waves reflected from the winding roll. Is detected to determine the distance L between the outer circumference of the winding roll and the reference position. As a result, the diameter D of the winding roll is measured by the formula D = (L ₀ −L) × 2.

Another winding diameter detecting device is disclosed in Japanese Utility Model Publication No. 60-30264. This device measures the respective times t ₁ and t ₂ per revolution of the winding roll having the diameter D _{1 and} the infeed roller having the constant diameter D ₂ ,
Obtained by counting the interval of the low-frequency pulse signal generated for each rotation by the proximity switch provided for each with the high-frequency reference clock pulse, D ₁ = D ₂ ×
It is calculated by the equation (t ₁ / t ₂ ).

[0005]

However, as described above, the winding diameter detecting device performs arithmetic processing on the basis of the sensor signal for detecting the diameter of the winding roll, and the preset winding just before the end of the winding paper is obtained. With the means to output the pasta signal with the paper splicing timing when the diameter is reached,
An error is likely to occur due to the sensor detection capability and the clock pulse counting accuracy, which greatly affects the calculation result. Particularly in the case of a plastic film having a thin paper thickness, the loss length of the paper roll, which corresponds to the difference in diameter caused by a slight error, cannot be ignored.

Therefore, attention has been focused on a means for obtaining the paper splicing timing by reducing the factors causing the error as much as possible and simply determining the remaining length of the paper roll. That is, the remaining length of the rolled paper is obtained by subtracting the length of the rewound web from the total length of the rolled paper in the initial stage of the winding roll, and a signal that reaches the preset remaining length of the rolled paper is obtained. Then, it has been attempted to use a pulse generator originally provided for measuring the product length in a winding device such as a rotary press as a subtraction counter. However, as is noticeable in multicolor gravure printing machines, when the web path from the paper feeding device that splices the paper to the winding device where the product length measuring device is installed differs depending on the number of colors to be printed, a constant paper There was a problem that it could not be used as a connection timing.

Therefore, according to the present invention, when the old and new rolls of the winding roll are automatically spliced together, the paster signal is output by determining when the old roll has reached the set remaining length of the roll. An object of the present invention is to obtain an automatic paper splicing timing detection device with very small error and high accuracy.

[0008]

SUMMARY OF THE INVENTION The present invention, which has been made in view of the above points, provides an automatic paper roll for another new take-up roll immediately before the wind-up roll of the take-up roll being rewound runs out. An automatic paper splicing timing detection device for splicing is provided with an encoder connected to an infeed roller, and the encoder detects the length of the winding paper of the winding roll based on a pulse signal generated every one rotation of the infeed roller. The take-up paper length sent for each revolution of the infeed roller is subtracted to always obtain the current take-up roll total length of the take-up roll and the updating is repeated, and the updated take-up roll total length of the take-up roll is set in advance. The automatic paper splicing timing detection device is configured to determine when the remaining length is reached or less and output a pasta signal.

[0009]

Embodiments of the present invention will be described below. FIG. 1 schematically shows a sheet feeding device of a rotary press provided with an automatic sheet joining device. In the figure, 1
2 is a take-up roll made of the old take-up paper 13 being rewound, 1
Reference numeral 4 denotes a take-up roll of a new take-up paper which is in a splicing standby state and is pivotally supported by both ends of a rotatable swivel arm 15. Reference numeral 16 denotes an automatic paper splicing device, which is equipped with a brush 17 for splicing the old winding paper 13 against the outer circumference of the winding roll 14 of the new winding paper by a paster signal and a cutter 18 for cutting the old winding paper 13 after the splicing. In addition, it is a conventionally known one equipped with a pre-drive mechanism and an automatic paper splicing controller which are not shown.

Reference numeral 20 denotes an infeed roller, which is driven by a drive system (not shown) and feeds out the old rewinding paper 13 which is being rewound without slipping by nipping it with the pressing roller 21. An encoder 22 is rotatably connected to the shaft end portion of the infeed roller 20, and the encoder 22 generates a Z-phase pulse signal for each rotation of the infeed roller 20.

Therefore, the procedure for outputting the pasta signal by the paper splicing timing detection device of the present invention will be described with reference to FIGS.
Also, description will be made with reference to the flowchart, timing chart, and block circuit shown in FIG. Here, the diameter of the infeed roller 20 is D, the initial length of the winding paper of the winding roll is M ₀ , the current length of the winding paper is M, and the winding roll remaining amount of the winding roll which is set in advance so as to have a proper splicing timing. _{Let the} quantity length be M _p . First, in step 1, a preset remaining web length M _p is input prior to the start of operation, and the known total length M of the take-up roll 14 is taken.
₀ is entered as the current total length M of the web. When the operation is started, the in-feed roller 20 is driven, the take-up paper 13 is rewound from the take-up roll 12, and the in-feed roller 20 is rotated to be delivered to the downstream side. The encoder 22 connected to the shaft end portion generates a Z-phase pulse signal for each rotation. In step 3, the control unit of the block circuit shown in FIG. 4 generates an operation signal (gate) from the Z-phase pulse signal and the reference clock signal (see FIG. 3), and the operation unit calculates M−Dπ. Then, the result is newly updated as M. In step 4, M <
Whether or not it is M _p is determined, and while NO is determined, steps 2, 3, and 4 are continuously repeated, and Y
When ES is reached, a pasta signal is output as step 5 (see FIG. 3).

In this way, the infeed roller 20
MD according to the Z-phase pulse signal generated for each rotation of the
By calculating π and constantly updating the total length M of the winding paper, when M <M _p is determined as the paper splicing timing, the paster signal is output, so that the preset length of the remaining amount of the winding paper is set appropriately. When Mp is reached, the paper splicing timing is detected. In this case, since the length of the rolled paper fed out by the infeed roller 20 adjacent to the automatic paper splicing device 16 is subtracted to obtain the current total length M of the rolled paper, it is substantially equal to the remaining length of the rolled paper of the winding roll 12. With the advantage that the web path length does not always change, the unique web path length from the automatic paper splicing device 16 to the infeed roller 20 can be corrected if necessary. Further, in a gravure printing machine or the like, printing may be terminated in the middle of the take-up roll. For example, when printing only 2000M of the take-up roll of 4000M, the remaining length of take-up paper M _p = 2000.
By automatically splicing waste paper as M and sending the printed web to the winding device, a predetermined amount of product can be obtained without taking the web path from the paper feeding device to the winding device as a loss amount. Obtainable.

[0013]

As described above, according to the present invention, the remaining amount of the rolled paper is always calculated based on the Z-phase pulse signal generated every one rotation of the infeed roller feeding the rolled paper, and the splicing timing is obtained. As the paster signal is output by determining when the remaining amount of the wound paper set appropriately as is, the automatic paper splicing timing detection device with an extremely small error and high accuracy as compared with the conventional one can be obtained. .

[Brief description of drawings]

FIG. 1 is a schematic view of a sheet feeding device for explaining an embodiment of the invention.

FIG. 2 is a flowchart illustrating an embodiment of the present invention.

FIG. 3 is a timing chart explaining an embodiment of the present invention.

FIG. 4 is a block circuit diagram illustrating an embodiment of the present invention.

[Explanation of symbols]

 12, 14 Winding roll 13 Old winding paper 15 Revolving arm 16 Automatic paper splicing device 17 Brush 18 Cutter 20 Infeed roller 21 Presser roller 22 Encoder

Claims (1)

[Claims] 1. An automatic paper splicing timing detection device for automatically splicing a paper roll of another new take-up roll, which is connected to an in-feed roller immediately before the paper roll of a take-up roll being rewound is exhausted. An encoder is provided, and based on a pulse signal generated by each rotation of the infeed roller, the encoder subtracts the length of the winding paper sent out for each rotation of the infeed roller from the total length of the winding paper of the winding roll, and always calculates the present value. The winding roll total length of the winding roll is obtained and the updating is repeated, and when the updated winding roll total length of the winding roll reaches the preset remaining length of the winding roll or less, the paster signal is output. An automatic paper splicing timing detection device configured as described above.