JPH0476906B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intermittent feeding device for web materials such as paper, cellophane film, polypropylene film, etc.

[Conventional technology]

4, 5 and 6 have been known as web material intermittent feeding devices for intermittently feeding this type of web material, such as a transparent film for box packaging, to a main machine, in this case a packaging machine.

In the structure of the first conventional example shown in FIGS. 4 and 5,
Reference numeral 51 denotes a web material, and the web material 51 is wound into a roll to form a take-up web 52. The web material 51 is preliminarily fed out from the take-up web 52 by intermittent rotation of a preliminary feeding roll 53. The preliminarily fed web material 51 is intermittently delivered to the machine 56, in this case a packaging machine, by the intermittent rotation of an intermittent delivery roll 55 via a vertically moving dancer roll 54.

That is, the dancer roll 54 applies tension to the web material 51 between the preliminary delivery roll 53 and the intermittent delivery roll 55, and also enables the intermittent delivery roll 55 to rotate intermittently.

However _, in the structure of this first conventional example, as shown in _FIG . The take-up web 52 repeatedly stops rotating, and the preliminary feeding roll 53 stops at the lower limit position of the dancer roll 54 in addition to the intermittent preliminary feeding rotation. As a result, the dancer roll 54 bounces up and the web material becomes slack, and the speed increases. In this case, there is also an impact at the above-mentioned point, which is inconvenient for high-speed preliminary feeding.

Further, in the structure of the second conventional example shown in FIG. 6, since the main machine 56 is operated at variable speeds, the high speed Vh and low speed Vl of the preliminary feeding roll 53 are determined in advance based on the operating speed range of the main machine, and The preliminary feeding roll 53 is continuously rotated depending on the speed.

[Problem that the invention seeks to solve]

However, in the case of the structure of this second conventional example, even though the machine is operated at variable speeds, the predetermined high speed Vh and low speed Vl are far apart from the required speed compared to the operating speed. Since the preliminary feeding roll 53 is rotated by the rotation, the rising and falling speed of the dancer roll increases, that is, the optimum preliminary feeding cannot be performed for the current operating speed, and this also causes an increase in the number of vertical movements of the dancer roll. Similar to the first conventional example, this method has the disadvantage that the winding web 52 runs ahead, the web material 51 meanders, the dancer roll 54 jumps up, the web material 51 slackens, etc., and it is not suitable for high speeds, as in the first conventional example. ing.

[Means for solving problems]

The present invention aims to eliminate these disadvantages, and the gist thereof is to pre-feed out the web material 1 from the take-up web 2 by a pre-feed roll 3, and to vertically move the pre-feed out web material 1. The operating speed of the machine 8 is constantly detected, in which the machine 8 is intermittently fed out via the dancer roll 4, which rotates intermittently at variable speeds as the machine 8 changes speed. Based on the speed detector 15 and the operating speed of the machine 8 detected by the speed detector 15, determine the stop time T during which the machine 8 is stopped, and after this stop time T elapses, the machine 8 starts and ends its operation. This time is calculated as one cycle of the machine 8, and the amount of work of the machine 8 in the one cycle is divided by this one cycle to calculate the amount of work of the machine 8 in the one cycle. Two-speed determination control unit 11 that calculates an average driving speed Vm and determines two predetermined speeds, high speed Vh and low speed Vl, based on the average driving speed Vm.
a variable speed motor 9 that continuously rotates the preliminary feeding roll 3; a position detector 12, 13 that detects the upper and lower limits of the dancer roll 4; When the speed reaches the lower limit, the variable speed motor 9 is switched from the low speed Vl determined by the two speed determination control section 11 to the high speed Vh by the detection operation of the position detector 12, and the position of the dancer roll 4 is lowered to reach the lower limit. When the position is reached, the variable speed motor 9 is switched from the high speed Vh determined by the two speed determination control section 11 to the low speed Vl by the detection operation of the position detector 13, and the preliminary feeding roll 3 is moved to the second speed Vl. A speed switching control section 10 that controls continuous rotation at one of the speeds of the steps;

[Effect]

The upper limit position and lower limit position of the dancer roll 4 are detected by position detectors 12 and 13, and the operating speed of the machine 8 is constantly detected by a speed detector 15. Then, the average operating speed Vm of this machine at the moment is calculated, and based on this average operating speed Vm, high speed Vh and low speed
Two speeds of Vl are determined.

The speed switching control unit 10 switches the speed to either the high speed Vh or the low speed Vl based on the position detectors 12 and 13, and the preliminary feeding roll 3 is switched to the high speed Vh or the low speed Vl. It rotates continuously at one of two speeds.

〔Example〕

1 to 3 show preferred embodiments of the present invention, in which 1 is a web material, the web material 1 is wound into a roll to form a take-up web 2, and from the take-up web 2. Web material 1 by preliminary feeding roll 3
It has started to be used as a preliminary feed.

Reference numeral 4 denotes dancer rolls. In this case, two dancer rolls are arranged so as to be movable up and down, and fixed rollers 5 and 6 are provided above and to the sides between the two dancer rolls 4.

Reference numeral 7 denotes an intermittent feed roll, which intermittently rotates in one direction by the action of a fan-shaped gear and a pinion (not shown), and intermittently feeds the roll to the following main machine 8, in this case a packaging machine. There is.

Reference numeral 9 denotes a variable speed motor, which drives the preliminary feeding roll 3.
rotates continuously at two speeds.

Speed switching control section 10, 2 speed determination control section 11
In this case, a microcomputer 11 designed to perform predetermined operations is used.

12 is a position detector that detects the upper limit position of the dancer roll 4; 13 is a position detector that detects the lower limit position of the dancer roll 4.

14 is an abnormality detector that detects the lowest position of the dancer roll.

Reference numeral 15 denotes a speed detector, in this case a tachometer generator that detects the rotation speed of the reference shaft of the machine 8.

Since this embodiment has the above configuration, the average operating speed Vm of the machine 8, which corresponds to the average speed when the preliminary delivery roll 3 is continuously rotated, as shown in FIG. 2, is calculated as follows.

One cycle of the machine 8 is defined as the sum of the stop time T during which the machine 8 is stopped and the operating time from when the machine 8 starts and ends its operation after this stop time T has elapsed. By dividing the amount of work of the machine 8 in the one cycle, the average operating speed Vm of the machine 8 in the one cycle is calculated. In other words, the amount of work per cycle of the machine 8 (the time from when the machine passes the stop time T, when the machine starts operating, until _the machine stops) is predetermined. In addition, one cycle of the machine 8 is determined by, for example, detecting the rotation speed of the reference shaft of the machine 8 with the speed detector 15, and from when the rotation of the reference shaft stops, the rotation of the reference shaft starts again at the next rotation. It is determined by measuring the time from when the rotation starts until it stops. This one cycle is input to the microcomputer 11, and the microcomputer 11 divides the feed amount S ₁ by this one cycle to calculate the average operating speed Vm that satisfies S ₁ = S ₃ as shown in Fig. 2 for each cycle. .

Based on this average operating speed Vm, high speeds Vh and Vl having a constant width of ±10% in this case are determined, and the pre-feeding roll 3 is continuously rotated by the variable speed motor 9 at one of these two speeds. I'm letting you do it.

In this case, when the intermittent feeding amount of the intermittent feeding roll 7 is greater than the preliminary feeding amount by the preliminary feeding roll 3 and the dancer roll 4 rises to the upper limit position, the position detector 12 detects that the dancer roll 4 has reached the upper limit position. The variable speed motor 9 is switched to the high speed Vh by the speed switching control section 10 due to the detection operation of the position detector 12. Moreover, this time, conversely, since the intermittent feeding amount of the intermittent feeding roll 7 becomes smaller than the preliminary feeding amount by the preliminary feeding roll 3, when the dancer roll 4 descends to the lower limit position,
The position detector 13 detects that the dancer roll 4 has reached the lower limit position, and due to the detection operation of the position detector 13, the speed switching control section 10 switches the variable speed motor 9 to the low speed Vl.

Therefore, the preliminary feed roll 3 rotates continuously at two speeds, high speed and low speed, which match the operating speed of the machine 8, and as a result, the optimum average operating speed is always maintained at the current time.
The preliminary feeding roll 3 can be continuously rotated at a high speed Vh or low speed Vl based on Vm, and the preliminary feeding roll 3 can be rotated continuously without rotating at a speed higher than necessary or slower than necessary. Coupled with this, the phenomenon of web material 1 running ahead of itself,
It is possible to suppress the bounce-up phenomenon of the dancer roll 4, it is possible to apply a substantially constant tension to the web material 1 between the intermittent feed roll 7 and the preliminary feed roll 3, and it is possible to prevent meandering etc. due to slack in the web material 1. High-speed preliminary feeding is possible.

In this embodiment, a plurality of dancer rolls 4, in this case two dancer rolls, are provided to reduce the lifting speed, acceleration, and lifting amount of the dancer rolls 4, and to reduce the impact when the dancer rolls 4 complete lifting and lowering.
In addition, the height of the dancer roll portion is lowered to make the entire device more compact.

In this case, when the position detector 13 detects the lower limit of the dancer roll 4 while the machine 8 is stopped, the web material intermittent feeding device is also configured to stop, or the abnormality detector 14 is activated. It is desirable that the web material intermittent feeding device be configured to be stopped by the lever.

〔Effect of the invention〕

As described above, the present invention constantly detects the operating speed of the machine and selects high speed and low speed based on the current operating speed.
The pre-feed roll can be rotated continuously at the speed of the stage,
Therefore, the preliminary feed roll can be rotated continuously at high and low speeds based on the current average operating speed, that is, based on the optimal reference speed, and the preliminary feed roll can be rotated continuously at high and low speeds based on the current average operating speed, that is, based on the optimal reference speed, and the This combination of the fact that the feed roll does not need to be rotated and the continuous rotation at two speeds suppresses the bounce-up phenomenon of the dancer roll, and maintains almost constant tension in the web material between the intermittent feed roll and the preliminary feed roll. It is possible to prevent web material from meandering due to sagging, and to enable high-speed preliminary feeding.

As described above, the intended purpose can be fully achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
The figure is an explanatory diagram, Fig. 2 is a speed diagram, Fig. 3 is a block diagram, Fig. 4 is an explanatory diagram of the structure of the first conventional example, and Fig. 5 is an explanatory diagram.
The figure is a speed diagram thereof, and FIG. 6 is an explanatory diagram of the structure of the second conventional example. DESCRIPTION OF SYMBOLS 1... Web material, 2... Winding web, 3... Preliminary feeding roll, 4... Dancer roll, 7... Intermittent feeding roll, 8... Machine, 9... Variable speed motor, 10... Speed switching control section, 11... 2 speeds Decision control unit, 12, 13
...Position detector, 15...Speed detector, Vh...High speed,
Vl...Low speed, Vm...Average operating speed, T...Stop time.

Claims (1)

[Scope of Claims] 1. The web material 1 is preliminarily fed out from the take-up web 2 by the preparatory feed roll 3, and the preliminarily fed web material 1 is sent to the main machine 8 via the vertically moving dancer roll 4. A speed detector 15 that constantly detects the operating speed of the machine 8, and a speed detector 15 that constantly detects the operating speed of the machine 8; From the operating speed of the machine 8 detected by the device 15, calculate the sum of the stop time T during which the machine 8 is stopped and the operating time from when the machine 8 starts to operate after this stop time T has elapsed until it stops operating. This time is determined as one cycle of the machine 8, and the work load of the machine 8 in the one cycle is divided by this one cycle to calculate the average operating speed Vm of the machine 8 in the one cycle. Two speed determination control unit 11 that determines two speeds, a predetermined high speed Vh and a predetermined low speed Vl, based on the average driving speed Vm.
a variable speed motor 9 that continuously rotates the preliminary feeding roll 3; a position detector 12, 13 that detects the upper and lower limits of the dancer roll 4; When the speed reaches the lower limit, the variable speed motor 9 is switched from the low speed Vl determined by the two speed determination control section 11 to the high speed Vh by the detection operation of the position detector 12, and the position of the dancer roll 4 is lowered to reach the lower limit. When the position is reached, the variable speed motor 9 is switched from the high speed Vh determined by the two speed determination control section 11 to the low speed Vl by the detection operation of the position detector 13, and the preliminary feeding roll 3 is moved to the second speed Vl. An intermittent feeding device for a web material, comprising: a speed switching control section 10 that controls the continuous rotation at one of the speeds of the steps;