JP3623544B2 - Feed amount shock absorber - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a feed amount buffering device that performs connection between continuous feed and intermittent feed in a feeding device for sheet-like members such as packaging films.
[0002]
[Prior art]
Conventionally, for example, in a film packaging machine for caramel-wrapping a box-shaped body as an article to be packaged with a packaging film, the packaging film is drawn from the original roll and supplied to the packaging unit. With a feeding device (continuous feeding roll), the film is continuously fed at a constant speed while the film is drawn from the original roll.
[0003]
On the other hand, since the packaging operation with respect to the article to be packaged is intermittent, the film is intermittently fed at a constant period by an intermittent feeding device (intermittent feeding roll) on the packaging unit side.
For this reason, it is necessary to absorb the difference in the periodic feed amount between the continuous feed and the intermittent feed device between the continuous feed device and the intermittent feed device on the rear stage side.
[0004]
For this reason, conventionally, a difference in feed amount is absorbed by providing a multistage dancer roll as a feed amount buffer device between the continuous feed device and the intermittent feed device. In other words, a large number of dancer rolls supported by springs with different spring constants are provided, the film is guided by these dancer rolls, and the dancer rolls having different vibration characteristics are combined as appropriate, thereby providing a periodic feed amount. The difference is absorbed.
[0005]
[Problems to be solved by the invention]
However, in the conventional feed amount buffering device using multi-stage dancer rolls, it is necessary to adjust by combining a large number of dancer rolls having different vibration characteristics. It was not always easy to obtain the action.
[0006]
In addition, in the high-speed intermittent feed, when a conventional free dancer roll is used, the dancer roll vibrates while the film is sent to a fixed size, and the tension on the film greatly fluctuates and the size thereof is excessive. For this reason, stretching and shrinkage of the film and sliding with the feed roll occur, making it difficult to feed the film with high accuracy, and stretching and shrinking in the width direction of the film are not uniform. There was a problem that happened.
[0007]
Also, the more dancers roll, the more space is required and the apparatus becomes larger.
Furthermore, with the diversification of packaging forms in film wrapping machines, for example, cassette cases with tape as the objects to be packaged, one package that wraps one cassette case at a time, and two cassette cases stacked together When it is necessary to change the feed amount per time because the film length used per time is different between 1 and 2 wrapping. However, it is difficult to cope with the diversification of packaging forms unless all the multi-stage dancer rolls are replaced with different ones. .
[0008]
In view of such a conventional problem, the present invention provides a feed amount buffering device that can absorb a difference in periodic feed amount between continuous feed and intermittent feed and can cope with speeding up and the like. With the goal.
[0009]
[Means for Solving the Problems]
For this reason, the invention according to claim 1 includes a continuous feeding device that continuously feeds the sheet-like member at a constant speed, and an intermittent feeding device that intermittently feeds the sheet-like member supplied by the continuous feeding device at a constant cycle. In the sheet-like member supply device, a dancer roll that guides the sheet-like member between the continuous feeding device and the intermittent feeding device, and a continuous feed during the fixed period by supporting a shaft of the dancer roll, A moving device for forcibly moving the shaft in a predetermined pattern for each predetermined period to change a path length of the sheet-like member so as to compensate for a difference in periodic feed amount due to intermittent feed; and the continuous feed A free dancer roll that guides a sheet-like member separately from the dancer roll between the apparatus and the intermittent feeding device, and a position of the free dancer roll is detected Configuration and置検out device, the continuous feeder continuous feed amount provided a continuous feed amount correction device for correcting in accordance with the position of the free dancer roll detected by the position detecting device according to the feed amount dampener To do.
[0010]
Moreover, in the invention which concerns on Claim 2, the said moving apparatus is comprised by a servomotor.
[0011]
[Action]
In the invention according to claim 1, the shaft of the dancer roll is forcibly moved in a predetermined pattern at regular intervals so as to compensate for the difference in the periodic feed amount between continuous feed and intermittent feed, and the sheet-like member By changing the path length, continuous feed and intermittent feed are smoothly connected. As a result, the sheet-like member can be supplied by continuous feed to a device that operates intermittently at high speed.
Further, a free dancer roll is provided between the continuous feed device and the intermittent feed device separately from the dancer roll, the position of the free dancer roll is detected by a position detection device, and the continuous feed device is used accordingly. Correct the continuous feed amount. Thereby, it is possible to avoid the influence of the expansion and contraction of the sheet-like member, the operation unevenness of the continuous feeding device or the intermittent feeding device, and to realize more stable film feeding.
[0012]
In the invention which concerns on Claim 2, it becomes what was excellent especially in high-speed followability by forcibly moving a dancer roll with a servomotor. This is because when the dancer roll is forcibly vibrated with a cam, it can follow in the case of low-speed intermittent feed, but the acceleration fluctuation of the dancer roll becomes large and cannot be followed with the cam during high-speed intermittent feed.
[0013]
In addition, in a device that needs to change the feed amount per time, it is necessary to change the operation pattern of the dancer roll. However, the operation pattern of the dancer roll can be freely changed by controlling with a servo motor. it can.
[0014]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic view of a packaging film supply apparatus in a film packaging machine showing an embodiment of the present invention.
In addition, this example is an example in the case of caramel wrapping with a packaging film with a tear tape for a tape-containing cassette case as an article to be packaged. This is an example in which two cassette cases in which two cassette cases are stacked and packed together can be switched.
[0015]
Referring to FIG. 1, a packaging film 2 having a predetermined width drawn out from an original roll 1 is fixed by a continuous feed roll 3 as a continuous feed device driven by an inverter motor after a tear tape (not shown) is adhered. Feeds continuously at a speed.
The film 2 fed by the continuous feed roll 3 is guided by a free dancer roll 4, a position fixing roll 5, a dancer roll 6 and a position fixing roll 7.
[0016]
The film 2 is further guided to the anvil roll 8 and a predetermined cut is made by the tear tape cutter 9 for gripping the tear tape.
The film 2 is further guided to an intermittent feed roll 10 as an intermittent feed device driven by a servo motor, and is intermittently fed by the intermittent feed roll 10 at a constant cycle in accordance with the rotation of a vacuum roll 11 described later.
[0017]
The film 2 fed by the intermittent feed roll 10 is supplied onto the vacuum roll 11 that is intermittently driven by the main motor via the index unit, cut by a film cutter 12 at a predetermined length, and indexed by the main motor. The sheets are supplied one by one so as to close the cassette case insertion holes 14 on the vacuum turret 13 that is intermittently driven through the unit. Then, the cassette case 15 is inserted into each cassette case insertion hole 14 of the vacuum turret 13 so that packaging of the cassette case 15 with the film 2 is started. Reference numeral 16 denotes an air suction hole.
[0018]
Next, the dancer roll 6 and the free dancer roll 4 between the continuous feed roll 3 and the intermittent feed roll 10 will be described.
The dancer roll 6 is positioned below the position fixing roll 5 and the position fixing roll 7 to guide the film 2.
On the other hand, a servo motor 108 is provided as a moving device for the dancer roll 6, the base end of the dancer arm 6a is fixed to the output shaft of the servo motor 108, and the axis of the dancer roll 6 is supported on the tip of the dancer arm 6a. I'm allowed. Accordingly, the path length of the film 2 can be changed between the position fixing rolls 5 and 7 by swinging the dancer arm 6a by moving the dancer arm 6a by the rotation of the servo motor 108 capable of rotating forward and reverse. it can.
[0019]
Here, referring to FIG. 2, if the film length used in one packaging is 158 mm (when one is packaged), the main motor rotation angle is intermittent every 360 degrees, that is, 360 intermittently, that is, 360 It is necessary to feed a film of 158 mm at the beginning of the degree, and to feed a film of 158 mm at a constant speed for 360 degrees with the continuous feed roll 3.
Therefore, when the film feed amount (cumulative value) by the intermittent feed roll 10 at each angle θ is A = f (θ) in the figure, and the film feed amount (cumulative value) by the continuous feed roll 3 is B = g (θ) in the figure. The amount of change in the film path length by the dancer roll 6 at each angle θ for absorbing the difference in feed amount between continuous feed and intermittent feed is C = A−B = f (θ) −g (θ) shown in the figure. It becomes. Here, the change amount C is a decrease-side change amount when positive and an increase-side change amount when negative.
[0020]
Further, since the amount of change in the film path length is twice the amount of movement of the dancer roll 6, the movement of the dancer roll 6 at each angle θ to absorb the difference in feed amount between continuous feed and intermittent feed. The amount is C / 2 = (A−B) / 2. The amount of movement (C / 2) here is the amount of movement upward in FIG. 1 when positive, and the amount of downward movement when negative.
[0021]
Therefore, if the movement pattern of the dancer roll 6 in one cycle (360 degrees in the main motor rotation angle) is stored and this movement is realized by the servo motor 108, the difference in feed amount between continuous feed and intermittent feed is achieved. Can be absorbed.
The free dancer roll 4 is positioned below the continuous feed roll 3 and the position fixing roll 5 to guide the film 2, but is supported by the tip of the turnable dancer arm 4 a. And is in contact with the film 2 by its own weight. This free dancer roll 4 is provided as an auxiliary to absorb the difference in feed amount that cannot be absorbed by the dancer roll 6 that is forced to vibrate by the servo motor 108 in a predetermined pattern as described above. is there.
[0022]
In addition, a potentiometer 110 serving as a position detecting device is provided on the rotation axis of the dancer arm 4a, whereby the position of the free dancer roll 4 is detected. The feed speed of the continuous feed roll 10 is controlled so that the position of the free dancer roll 4 detected by the potentiometer 110 is kept constant.
FIG. 3 is a drive system diagram of the dancer roll 6 and the like, which will be described below. In the figure, a solid line connection indicates a mechanical connection, and a dotted line connection indicates an electrical connection.
[0023]
The main motor (inverter motor) 101 intermittently drives the vacuum turret 13 via the index unit 103, and the speed is set by the sequencer 120. The rotation of the main motor 101 is detected by the rotary encoder 102.
In addition, the vacuum roll 11 is intermittently driven by the main motor 101 via the index unit 103. The rotation of the vacuum roll 11 is detected by the rotary encoder 104.
[0024]
Here, the continuous feed roll 3 is continuously driven by the inverter motor 105, and the speed of the inverter motor 105 is set by the sequencer 120.
This speed setting is feedback controlled by the sequencer 120 so that the output of the potentiometer 110 becomes constant. Therefore, the sequencer 120 also serves as a continuous feed amount correcting means.
[0025]
The intermittent feed roll 10 is intermittently driven by a servo motor 106, and the servo motor 106 is controlled by a servo motor controller 107. Here, a signal from the rotary encoder 104 that detects the rotation of the vacuum roll 11 is input to the servo motor controller 107, and the servo motor 106 is intermittently driven based on the signal from the rotary encoder 104 by the servo motor controller 107.
[0026]
The dancer roll 6 is driven by a servo motor 108, and the servo motor 108 is controlled by a servo motor controller 109. Here, a signal from the rotary encoder 102 for detecting the rotation of the main motor 101 is input to the servo motor controller 109, and the servo motor 108 is operated by the servo motor controller 109 according to a function set in advance based on the signal from the rotary encoder 102. Driven in a predetermined pattern.
[0027]
Here, when switching from the above-mentioned one-packaging to two-packaging, the original roll 1 having a different width is used and the servo motor is used to change the film length used in one packaging from 158 mm to 189 mm, for example. The controller 107 changes the feed amount per time by the intermittent feed roll 10 from 158 mm to 189 mm. In accordance with this, the speed setting of the inverter motor 105 is changed by the sequencer 120, and the feed amount per one time by the continuous feed roll 3 is changed from 158 mm to 189 mm. In accordance with this, the function used by the servo motor controller 109 is changed to change the operation characteristics of the dancer roll 6.
[0028]
【The invention's effect】
As described above, according to the first aspect of the present invention, the difference between the periodic feed amounts between the continuous feed and the intermittent feed is completely absorbed, and the continuous feed and the intermittent feed can be smoothly connected. In addition, it is possible to obtain the effects of facilitating the adjustment, adapting to high speed, miniaturizing the apparatus, and the like.
Then, by correcting the continuous feed amount by the continuous feed device according to the position of the free dancer roll detected by the position detection device, the influence of expansion and contraction of the sheet-like member, uneven operation of the continuous feed device and the intermittent feed device, etc. The effect that a more stable film feeding can be realized is obtained.
[0029]
Further, according to the invention according to claim 2, by forcibly moving the dancer roll by the servo motor, it becomes particularly excellent in high-speed followability, and it becomes easy to change the operation characteristics of the dancer roll. An effect is obtained.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a packaging film supply apparatus showing an embodiment of the present invention. FIG. 2 is a diagram showing operating characteristics of a dancer roll. FIG. 3 is a drive system diagram of the dancer roll.
1 Raw roll 2 Packaging film 3 Continuous feed roll (continuous feed device)
4 Free Dancer Roll 5 Position Fixed Roll 6 Dancer Roll 7 Position Fixed Roll 8 Anvil Roll 9 Tear Tape Cutter 10 Intermittent Feed Roll (Intermittent Feed Device)
11 Vacuum roll 12 Film cutter 13 Vacuum turret 108 Servo motor (moving device)
109 Servo motor controller 110 Potentiometer (position detection device)
120 Sequencer (Continuous feed amount correction device)

Claims (3)

In a sheet-like member supply device comprising a continuous feed device that continuously feeds a sheet-like member at a constant speed, and an intermittent feed device that intermittently feeds the sheet-like member supplied by the continuous feed device at a constant cycle,
A dancer roll for guiding a sheet-like member between the continuous feeding device and the intermittent feeding device;
In order to change the path length of the sheet-like member to support the dancer roll shaft and compensate for the difference in periodic feed amount between continuous feed and intermittent feed during the given cycle A moving device for forcibly moving the shaft in a predetermined pattern for each;
A free dancer roll that guides a sheet-like member separately from the dancer roll between the continuous feeding device and the intermittent feeding device,
A position detection device for detecting the position of this free dancer roll;
A continuous feed amount correcting device for correcting the continuous feed amount by the continuous feed device according to the position of the free dancer roll detected by the position detecting device;
A feed shock absorber characterized by comprising: The feed amount buffering device according to claim 1, wherein the moving device includes a servo motor. A free dancer roll for guiding a sheet-like member separately from the dancer roll between the continuous feeding device and the intermittent feeding device;
A position detection device for detecting the position of this free dancer roll;
A continuous feed amount correcting device for correcting the continuous feed amount by the continuous feed device according to the position of the free dancer roll detected by the position detecting device;
The feed amount buffering device according to claim 1, wherein a feed amount buffering device is provided.

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