JPH0617187B2 - Automatic film feed pitch adjusting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an automatic film feed pitch adjusting device for bag making machines, such as the bag making machine described in Japanese Patent Application No. 60-29164, which intermittently feeds film. Regarding

[Conventional technology]

In the above bag making machine, the film is made by intermittently feeding and sealing it with a sealer.

A conventional apparatus will be described below with reference to FIG. This apparatus is roughly divided into a film supply unit 1, a film intermittent feeding unit 2, and a bag unloading unit 3.

In the film supply unit 1, the film 4 continuously drawn from the film roll 10 is folded in half along a center line by a folding device 11 and is intermittently fed through a dancer roll 12.

The intermittent film feed section 2 has intermittent feed rollers 20 and 21, and the lower feed roller 21 is a shaft 2 as shown in FIG.
2, pulley 23, timing belt 24, pulley 25, output shaft 2
6, electromagnetic brake 27, electromagnetic clutch 28, pinion shaft 29,
Pinion 30, super gear 31, pinion 32, sector gear
Crank through 33, pin 34, connecting rod 35
Connect to 36.

In the crank 36, a U-shaped arm 38 is fixed to a drive shaft 37 connected to a drive motor (not shown).
A nut block that supports the screw 39 to rotate and is screwed into the screw 39 to operate in the axial direction.
The connecting rod 35 is connected to 40 via a pin 41.

As shown in the second illustration, a sealer 42 and a sealing roller 43 are provided in front of the intermittent feed rollers 20 and 21, and sealing cams 44 and 44 for vertically moving the sealer 42 are provided on the drive shaft 37 as shown in the first illustration. Fix it.

The bag take-out section 3 is the same as the above-mentioned Japanese Patent Application No. 60-29164 and does not relate to the gist of the present invention, so a detailed description thereof will be omitted.

Next, the operation of the above device will be described.

In FIG. 4, the arm 38 is rotated by the rotation of the drive shaft 37, and the sector gear 33, the pinion 32, the super gear 31, the pinion 30, and the pinion shaft 29 are connected via the connecting rod 35.
Swings and rotates. When the pinion shaft 29 rotates forward, the electromagnetic brake 27 disengages and the electromagnetic clutch 28 operates, and when it rotates reversely, the electromagnetic clutch 28 disengages and the electromagnetic brake 27 operates, and the output shaft 26, the pulley 25, the timing belt 24, the pulley 23, and the shaft 22. The intermittent feed rollers 20 and 21 perform the intermittent motion only in the forward rotation via.
(Hereafter, rotation in the film feed direction is defined as normal rotation). To increase the film feed pitch accuracy, the electromagnetic clutch 28,
The electromagnetic brake 27 performs high-speed control and repeats high-speed attachment / detachment.

On the other hand, in conjunction with the intermittent feed of the film 4 by the feed rollers 20 and 21, the sealer 42 is moved up and down by the sealing cams 44 and 44 attached to the drive shaft 37 shown in FIG. Cut into bags 4a.

In the case of plain film feeding, the relative position of the crank 36 and the connecting rod 35 is determined by a timing cam (not shown) fixed to the drive shaft 37 (spindle) so that the top dead center (θ = in FIG. 4).
180 °) or a predetermined rotation angle near bottom dead center (also θ = 0 °), the limit switch, proximity switch, etc. work to send an operation signal to the electromagnetic clutch 28, electromagnetic brake 27, and the electromagnetic clutch 28, electromagnetic brake 27 is operated. Also, instead of this timing cam, an encoder can be attached to the drive shaft 37 and the same operation can be performed depending on the setting value of the encoder. The plain film feed pitch is uniquely determined by the amount of eccentricity of the crank 36.

On the other hand, for the printing film, a photoelectric detector 45 is attached on the running surface of the film 4 as shown in FIG. 2 to detect a special mark (eye mark) printed for printing the film 4 or detecting the film feed pitch. To do. The photoelectric detector 45 defines a range for detecting a print mark by a setting position of a timing cam, an encoder or the like to prevent a malfunction due to other printing or the like. The detection signal t of this photoelectric detector 45
Controls the electromagnetic brake 27 and the electromagnetic clutch 28 via the high speed controller 46 to seal and cut the film 4 in accordance with the position of the print mark on the film 4. The print film feed pitch adjustment is slightly longer than the print pitch (deviation amount d)
If the eccentric amount of the crank 36 is set so that the film is fed, the print pitch mark will always pass under the photoelectric detector 45, so the photoelectric detector 45 detects the print mark and the electromagnetic clutch 28 is activated. Remove and send a signal to activate the electromagnetic brake 27. For this reason, the photoelectric detector 45 can be operated within a certain rotation angle range before the bottom dead center of the crank 36.

Since such a conventional device uses a system in which the light spot of the head of the photoelectric detector 45 picks up a printing mark and stops the film feeding, it has an advantage that the bag width dimension accuracy is good.

[Problems to be solved by the invention]

However, the print mark, that is, the eye mark on the film is not accurate, and there is a drawback that the print pitch varies. In addition, the printing pitch may change due to stretching of the film while the bag is being made. In recent years, this tendency has increased as the winding diameter has increased. If the pitch becomes longer, the film feed becomes insufficient, the print mark goes out of the detection range of the head of the photoelectric detector 45 or its light spot, the photoelectric detector 45 cannot be controlled, and a considerable amount of defective bags before the operator notices. May make. If the pitch becomes shorter, the extra feed amount (deviation amount d) becomes larger, and the operating point of the electromagnetic brake 27 becomes the crank.
Since it is separated from the bottom dead center of 36, the sudden stop is repeated during rotation of the electromagnetic clutch 28, the output shaft 26 of the electromagnetic brake 27, the feed rollers 20, 21, the sealing roller 43, etc., and the electromagnetic clutch 28, the electromagnetic brake 27, etc. Wear causes shortening of life, mechanical vibration and noise, lowering of bag width dimensional accuracy, and lowering of bag quality. In order to prevent such a situation, the operator must constantly monitor, and he cannot afford to focus on other work. Further, when the printing pitch becomes short, it is difficult to numerically grasp what the above-mentioned extra feed amount (deviation amount d) is. Therefore, the deviation amount d is set to a large value, and bag manufacturing is often continued with the drawbacks when the deviation amount d is large.

Conventionally, the film feed pitch is set to a position where the special handle for pitch adjustment can be inserted into the crank screw 39 built into the crank 36 shown in Fig. 3 (b) by turning the machine by hand or by inching the machine. Turn 36 and adjust the approximate pitch size while watching the scale on crank 36 with the special handle. Next, for the plain film, the friction block 1 fixed to the handle 13 while the machine was operating with the fine adjustment handle 13 for pitch adjustment shown in FIG.
One of the 4 and 15 is brought into contact with the spur gear 16 fixed to the end of the crank screw 39 to cause the spur gear 16 to rotate to the left or right to rotate the crank screw 39, and a nut screwed to it. The block 40 and the pin 41 are moved up and down to slightly change the eccentricity of the crank 36. In this way, the actual pitch of the bag and the pitch adjustment fine adjustment are repeated to bring the pitch closer to the desired pitch. On the other hand, the print film is adjusted by the same method as above so that the print film is fed a little longer than the print pitch while the photoelectric detector 45 is not operated.
Next, at the predetermined position on the passing line of the print mark, the photoelectric detector 45
The head was placed and the photoelectric detector 45 was operated to control the electromagnetic clutch 28 and the electromagnetic brake 27 to perform pitch adjustment.

However, there is a complaint that such a series of pitch adjustment work is not suitable for an inexperienced operator or a female operator. In addition, at this time, since pitching is performed while bag making, bag making loss occurs.

[Means for solving problems]

The present invention eliminates such drawbacks by using a drive device controlled by a microcomputer for adjusting the film intermittent feed, and the film feed pitch (bag width dimension) is stopped while the machine is stopped.
Regardless of whether you are driving, make settings or fine adjustments with the keyboard, and in the case of printing film, according to the printing pitch,
The film feed pitch is automatically corrected and controlled so that the best film feed can be performed.

The present invention relates to the intermittent feed rollers 20 and 21 of the film 4,
A crank 36 connected to the intermittent feed rollers 20 and 21 via an electromagnetic brake 27 and an electromagnetic clutch 28, a drive shaft 37 of the crank 36, a device 39 for adjusting the eccentric amount of the crank 36, and printing of the film 4. In the film intermittent feeding unit 2 including the photoelectric detector 45 for detecting the mark and the device 46 for controlling the electromagnetic brake 27 and the electromagnetic clutch 28 at high speed by the detection signal t of the photoelectric detector 45, the drive shaft 37 and the crank An adder mechanism 48 including a satellite gear device, a differential gear device, and the like is provided between the device 39 for adjusting the eccentric amount 36 and an encoder for selecting the absolute film feed amount.
Encoder for detecting signal a of 81 and intermittent feed amount of film
The signal b of 82 and the signal s for setting the deviation amount d of the film feed are input to detect the absolute feed amount of the film.
The absolute feed amount A according to the signal a of the above is the sum of the actual feed amount B of the film according to the signal b of the intermittent feed amount detection encoder 82 of the film and the deviation amount d of the film feed (A = B +
a microcomputer 80 that outputs an output signal c so that
Stepping motor 74 operated by its output signal c
It is a combination of.

〔Example〕

 An embodiment of the present invention will be described in detail below with reference to FIG.

An adder mechanism 48 is provided between the drive shaft 37 and a device (screw) 39 for adjusting the eccentricity of the crank 36, and the motion of the drive device 49 controlled by a microcomputer is input to the adder mechanism 48 to rotate the screw 39. The eccentric amount of the crank 36 is changed to adjust the intermittent feed length of the film 4.

A sun gear 51 is fixed to a differential shaft 50 of the adding mechanism 48, and a pair of timing belt pulleys 52 and 53 are fitted on both sides of the sun gear 51 so as to rotate. The planetary gears 54, 54 pivotally supported on one timing belt pulley 52 are meshed with the outer circumference of the sun gear 51 and the inner circumference of an internal gear provided on the other timing belt pulley 53.

One timing belt pulley 52 in the adding mechanism 48 is connected by a timing belt pulley 55 and a timing belt 56 fixed to the drive shaft 37.

The other timing belt pulley 53 in the adding mechanism 48 is a timing belt 60, a pulley 61, an intermediate shaft 62, a sprocket wheel 63, a chain 64, a sprocket wheel 65 fitted to rotate on a drive shaft 37, gears 66, 67, an umbrella. Gear 68,
It is connected to the screw 39 via 69.

A drive device 49 controlled by a microcomputer is connected to the differential shaft 50 of the adding mechanism 48. That is, the differential shaft 50 is connected to the shaft 75 of the stepping motor 74 via the timing belt pulley 70, the timing belt 71, the timing belt pulley 72, and the shaft 73. On the other hand, the shaft 75 of the stepping motor 74 is a crank.
An encoder 81 for converting the eccentricity into a rotation angle and detecting the eccentricity corresponding to the eccentricity of 36 is connected.

In the microcomputer 80, the axis 75 of the stepping motor 74 is set to 1:
1 and the crank eccentricity amount is converted into a rotation angle and detected, that is, the signal a of the absolute feed amount detection encoder 81,
The signal b of the encoder 82 for detecting the intermittent rotation angle of the shaft 22 of the feed rollers 20, 21 shown in FIG. 4, that is, the intermittent feed amount of the film, and the signal s for setting the deviation amount d are input,
The output signal c controls the stepping motor 74.

The microcomputer 80 controls the stepping motor 74 so that the absolute feed amount A by the signal a becomes the sum (A = B + d) of the actual film feed amount B by the signal b and the deviation amount d by the signal s.

Next, the operation of this device will be described.

The rotational force of the drive shaft 37 is transmitted to the timing belt pulley 52 of the adding mechanism 48 via the timing belt pulley 55 and the timing belt 56. Also this timing belt pulley 52
The rotational force of the timing belt pulley 53, which rotates through the planetary gear 54, is the timing belt 60, the pulley 6
1, intermediate shaft 62, sprocket wheel 63, chain 64,
Sprocket wheel 6 fitted to rotate on drive shaft 37
5, transmitted to the screw 39 through the gears 66 and 67 and the bevel gears 68 and 69. When the film feed pitch is constant and the film is intermittently fed, the sprocket wheel 65 and the drive shaft 37 rotate integrally at a constant speed, and the screw 39 does not rotate.
The amount of eccentricity of the crank 36 is constant.

When the pitch of the print marks on the film 4 fluctuates due to a printing error, a film tension error at the time of printing, a film extension, or the like, the signal from the photoelectric detector 45 or the crank 36
The signal (not shown) from the timing cam attached to the drive shaft 37 of the above changes the actual film feed amount B generated by the operation of the high speed controller 46, and the crank at that time is changed.
The deviation from the absolute feed amount A, which is determined by the eccentric amount of 36 (substantially equal to the film feed amount for plain film), is input in advance from the keyboard to the Mancon 80 as the amount to be fed in excess of the pitch of the print marks on film 4. It makes a difference from the quantity d. That is, since B of d = A-B becomes B ', d' = A-B '. The microcomputer 80 immediately sends a signal c to the stepping motor 74 to change the deviation amount d'to a preset deviation amount d and rotate the stepping motor 74 to change the eccentricity amount of the crank. In other words, the absolute feed amount A is changed to A. ′, The deviation amount d ′ is returned to the deviation amount d, and d =
Continue the operation in the state of A'-B '. That is, the microcomputer 80 automatically corrects the deviation amount d. Also, when the actual film feed pitch is changed due to the film feed pitch setting or the automatic adjustment by the microcomputer command, the rotation angles of the intermittent feed rollers 20 and 21 are changed, and the signal b of the encoder 82 is changed. . As a result, the microcomputer 80 generates an output signal c corresponding to the amount of fluctuation, and the stepping motor 74 rotates. Also, when the set value of the extra feed deviation amount d with respect to the pitch of the print mark is changed, A ≠ B + d ″,
The microcomputer 80 generates the output signal c and outputs the stepping motor 74
Rotates. This rotational force is transmitted to the differential shaft 50 via the shafts 75 and 73, the timing belt pulley 72, the timing belt 71, and the timing belt pulley 70, and the sun gear of the adding mechanism 48 is transmitted.
Rotate 51. This amount of rotation is the timing belt pulley 53
Timing belt 60, pulley 61, intermediate shaft 62, sprocket wheel 63, chain 64, drive shaft
Sprocket wheel 65 fitted to rotate to 37, gear
It is transmitted to the screw 39 via 66, 67 and bevel gears 68, 69,
The rotation of the screw 39 causes the block 40 to operate in the axial direction thereof, the eccentric amount of the crank is changed, and the rotation amount of the sector gear 33 at the time of forward rotation is changed in accordance with the change of the feed pitch of the film 4. That is, in the case of the plain film, the film feed pitch changes, and for the print film, the extra feed length (deviation amount d) is caused by the change of the print pitch.
The film feed is automatically corrected so that is constant. Further, when the program of the microcomputer 80 is changed and the difference (ε) between the basic feed amount and the actual film feed amount is within the range of 0 to a predetermined allowable error D, the basic feed amount does not change,
When the difference (ε) between the basic feed amount and the actual film feed amount is out of this range (value between 0 and D), the deviation amount d ″ specified in advance is added to or subtracted from this basic feed amount. You may

As described above, in the above apparatus, the microcomputer 80 automatically adjusts the eccentricity of the crank 36 so that the extra feed amount (deviation amount d) of the film 4 is always constant even if the printing pitch of the film changes. It is not necessary to look at the safety to prevent the risk of the light spot falling off the print mark, and the extra feed amount (deviation amount d) can be set to an extremely small value, so that the electromagnetic clutch 28 is almost at the bottom dead center of the crank. The electromagnetic brake 27 can be operated to prolong the life of parts such as clutches and brakes, eliminate machine vibration and noise, improve bag width dimension accuracy, and improve bag quality.

5 to 7 show a concrete mechanism of the present invention.
The same parts as those in FIG. 1 are denoted by the same reference numerals. As shown in the figure, the adder mechanism is composed of adjacent timing belt pulleys having a small and simple planetary gear built in, and is provided in a part of the drive system at a position apart from the crank.

Therefore, the device of the present invention can be mounted relatively easily and freely without complicatedly incorporating the planetary gear or differential gear train mechanism of the adding mechanism in the crank portion, and without making a great modification to the conventional bag-making machine. Can be incorporated.

In other words, the structure is such that the constituent elements of the present invention are additionally attached to the conventional machine, so that the main frame and the like can be commonly used, and therefore the modification is simple and practical. Also, this device requires only intensive lubrication of the crank portion, and most other drive systems can be lubricated.

〔The invention's effect〕

 The effects of the present invention are summarized as follows.

(1) Since the film feed pitch can be set using the microcomputer keyboard, even inexperienced operators and female operators can easily operate the machine regardless of whether the machine is stopped or running.

(2) Since there is no need for trial adjustment for fine adjustment, there is no loss of film.

(3) Since the microcomputer automatically corrects the extra feeding amount (deviation amount d) by the stepping motor and the adding mechanism so that the extra feeding amount is always constant even if the pitch of the printing mark changes with respect to the printing film, the photoelectric detector The light spot of 1 does not deviate from the mark, and the control by the photoelectric detector can be performed accurately. Further, this eliminates the need for operator's monitoring work and allows the operator to do other work.

(4) In such a crank machine, it is preferable to operate the electromagnetic brake near its bottom dead center, but if the deviation is large, the operating point will be far from the bottom dead center. However, in the present invention, since the amount of film extra feeding (deviation amount d) can be set to an extremely small numerical value, the electromagnetic clutch and the electromagnetic brake can be operated at almost the bottom dead center of the crank. Extend the service life of parts, eliminate machine vibration and noise, improve bag width dimension accuracy, and improve bag quality.

(5) For example, in Japanese Examined Patent Publication No. 53-8269, since a device for adjusting the film feed amount is provided on the driven side of the crank, the mass of the reciprocating portion becomes large and the impact noise becomes large. Since there is no device for adjusting the amount of eccentricity on the driven side of the crank to adjust the film feed amount, the mass of the reciprocating portion is small and the mechanical shock and noise are small.

(6) In Japanese Examined Patent Publication No. 53-8269, the deviation amount is controlled so that the deviation amount becomes 0. Therefore, the deviation amount may increase as errors accumulate, and the control amount may increase. The feed amount A is the actual film feed amount B,
Since the control is performed so as to be the sum of the deviation amount of the film feed and the deviation amount d by the signal, the control by the microcomputer is easy to calculate and the deviation amount only needs to be changed step by step. The control amount is small, and accurate control is possible.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of an embodiment of the present invention, FIG. 2 is an explanatory view showing an outline of a conventional bag making machine, FIG. 3 (a) is a front view of a crank thereof, and FIG. (B) is a sectional view taken along the line A-A of (a), FIG. 4 is a perspective view of the film intermittent feeding portion, FIG. 5 is a side view of the specific mechanism of the main part of the present invention, and FIG. 5 is a sectional view taken along line BB in FIG. 5, and FIG. 7 is a sectional view taken along line CC in FIG. 2 ... film intermittent feed section, 4 ... film, 20, 21 ...
… Intermittent feed roller, 27 …… Electromagnetic brake, 28 …… Electromagnetic clutch, 36 …… Crank, 37 …… Drive shaft, 39 …… Device (screw) for adjusting the amount of eccentricity of the crank, 48 ……
Addition mechanism, 80 ... Microcomputer, 49 ... Drive device, 45 ...
… Photoelectric detector, t… Signal, 46… High-speed control device, 82…
... encoder, b ... signal, s ... signal, d ... deviation amount, 74 ... stepping motor.

Claims (1)

[Claims] 1. An intermittent feed roller for a film, a crank connected to the intermittent feed roller via an electromagnetic brake and an electromagnetic clutch, a drive shaft for the crank, a device for adjusting the amount of eccentricity of the crank, and a film. A device for adjusting the amount of eccentricity between the drive shaft and the crank in a film intermittent feed unit including a photoelectric detector that detects a print mark and a device that controls the electromagnetic brake and the electromagnetic clutch at high speed by a detection signal of the photoelectric detector. An adder mechanism consisting of a differential gear device is installed between the and, and the signal from the encoder for detecting the absolute film feed amount, the signal from the encoder for detecting the film intermittent feed amount, and the deviation amount of the film feed are set to this adder mechanism. Signal and the absolute feed amount of the film is detected. A microcomputer that outputs an output signal that makes the sum of the actual film feed amount by the encoder signal and the deviation amount by the signal that sets the film feed deviation amount and the stepping motor that operates by the output signal are combined. Automatic film feed pitch adjusting device.