JPS62230554A - Film feeding pitch automatically adjusting device - Google Patents

Abstract

PURPOSE:To prevent loss in bag manufacturing by providing adding mechanism between a driving shaft and an eccentricity adjusting device of a crank and inputting the movement of a drive device by the micro-computer control to the adding mechanism so as to automatically modify a film intermittent feeding pitch. CONSTITUTION:The torque of a driving shaft 37 is transmitted to an adding mechanism 48 through a timing belt 56 and its rotation is transmitted to a sprocket wheel 65 through a planetary gear 54 and timing belts 60, 64 and then transmitted to a screw 37. A drive device 49 by micro-computer control is connected to the differential shaft 50 of the adding mechanism 48. When film feeding pitch is fixed and intermittent, the sprocket wheel and the driving shaft rotate in a body at the same speed and the screw 39 doesn's operate and the eccentricity of a rank 36 becomes fixed. When the pitch of a film printing mark changed, the actual film feeding quantity by the movement of a high speed control device changes and the difference caused by this is compared with the difference which was input into the micro-computer in advance and a stepping motor 74 is driven and the screw 39 operates and then the eccentricity of the crank 36 changes.

Description

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

[Conventional technology]

In the bag-making machine described above, the film is intermittently fed and sealed with a sealer to form bags.

A conventional device will be explained below with reference to FIG. This device is roughly divided into a film supply section 1, an intermittent film feed section 2, and a bag take-out section 3.

In the film supply section 1, the film 4 is continuously drawn out from the filter roll 10, is folded into two along the center line by a folding device 11, and is sent intermittently through a dancer roll 12.

The intermittent film feed section 2 includes an intermittent feed roller 20,
21, and the lower feed roller 2 as shown in the fourth figure.
1 is a shaft 22, a pulley 23, a timing belt 24, a pulley 25, an output shaft 26, an electromagnetic brake 27, an electromagnetic clutch 28, a pinion shaft 29, a pinion 30, a super gear 3
1. Connected to a crank 36 via a pinion 32, a sector gear 33, a pin 34, and a connecting rod 35.

In the crank 36, a U-shaped arm 38 is fixed to a drive shaft 37 connected to a drive motor (not shown), and a screw 39 is rotatably supported within this arm 38. The connecting rod 35 is connected via a pin 41 to a nut block 40 which is screwed together to operate in the same direction.

As shown in the second figure, a sheath 542 and a sealing roller 43 are provided in front of the intermittent feed roller 20° 21,
As shown in the first figure, sealing cams 44, 44 for moving the sheath 542 up and down are fixed to the drive shaft 37.

The bag removal section 3 is the same as that in the above-mentioned Japanese Patent Application No. 60-29164, and since it is not related to the gist of the present invention, a detailed explanation thereof will be omitted.

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

In FIG. 4, the arm 38 rotates due to the rotation of the drive shaft 37, and the arm 38 is connected to the sector gear 3 via the connecting rod 35.
3, pinion 32, super gear 31, pinion 30,
The pinion shaft 29 swings and rotates. When the pinion shaft 29 rotates in the normal direction, the electromagnetic brake 27 is released and the electromagnetic clutch 28 is activated, and when the pinion shaft 29 rotates in the reverse direction, the electromagnetic clutch 28 is released and the electromagnetic brake 2
7 works, and the intermittent feed rollers 20 and 21 perform intermittent motion of only forward rotation via the output shaft 26, pulley 25, timing belt 24, pulley 23, and shaft 22. (Hereafter,
Rotation in the film feeding direction is considered normal rotation). In order to increase film feed pinch accuracy, an electromagnetic clutch 28. The electromagnetic brake 27 performs high-speed control and repeats high-speed attachment and detachment.

On the other hand, in conjunction with the intermittent feeding of the film 4 by the feed rollers 20 and 21, when the film is stationary, the sheath 542 is moved up and down by the sealing cams 44 and 44 attached to the drive shaft 37 shown in the first figure, sealing and sealing the film 4. Cut it to make a bag 4a.

In the case of plain film feeding, a timing cam (not shown) fixed to the drive shaft 37 (main shaft) adjusts the relative position of the crank 36 and the connecting rod 35 to top dead center (when θ=180° in Figure 4) or to the bottom. Dead center (also θ=0
degree), the limit switch, proximity switch, etc. operate at a predetermined rotation angle near the electromagnetic clutch 28. An operating signal is sent to the electromagnetic brake 27, and the electromagnetic clutch 28. The electromagnetic brake 27 is operated. Further, instead of this timing cam, an encoder can be attached to the drive shaft 37, and the same thing can be done by setting values of the encoder. The plain film feeding pitch is uniquely determined by the amount of eccentricity of the crank 36.

On the other hand, for printed films, a photoelectric detector 45 is attached as shown in the second figure on the running surface of the film 4, and a special mark (eye mark) printed on the film 4 or for detecting the film feeding pitch is detected. do. The photoelectric detector 45 uses a setting device such as a timing cam or an encoder to determine the range in which printing marks are detected, thereby preventing malfunctions caused by other printing or the like. The detection signal t of this photoelectric detector 45 is transmitted to the electromagnetic brake 27 via a high-speed control device 46.
The electromagnetic clutch 28 is controlled to seal the film 4 in accordance with the position of the printing mark on the film 4 and perform 9 [1i. To adjust the print film feed pitch, if the eccentricity of the crank 36 is set so that the film feed is slightly longer than the print pitch (deviation ff1d), the print pitch mark will always pass directly below the photoelectric detector 45. A photoelectric detector 45 detects the printed mark and sends a signal to disengage the electromagnetic clutch 28 and activate the electromagnetic brake 27. For this reason, the photoelectric detector 45 is allowed to operate within a certain rotational angle range before the bottom dead center of the crank 36.

This conventional machine uses a method in which the light spot of the head of the photoelectric detector 45 picks up the printed mark and stops the film advance, so it has the advantage of good bag width dimension accuracy.

[Problem that the invention seeks to solve]

However, the printing marks, or eye marks, on film have the drawback of poor accuracy and the printing pitch may vary.Also, during bag making, the printing pitch may change due to film elongation, etc.In recent years, , this tendency increases as the winding diameter increases.If the pinch becomes longer, the film will not be fed enough, and the printed mark will be out of the detection range of the head of the photoelectric detector 45 or its light spot. Control may be lost and a considerable amount of defective bags may be produced before the operator notices.Also, if the pitch is shortened, the excess amount of bags sent (
The deviation Id) increases, and the operating point of the electromagnetic brake 27 moves away from the bottom dead center of the crank 36, so the electromagnetic clutch 28,
Output shaft 26 of electromagnetic brake 27, feed roller 20
, 21, the electromagnetic clutch 28. will repeatedly stop suddenly during rotation of the sealing roller 43, etc. Decreased service life due to wear of the electromagnetic press 27, etc. 1. Causes mechanical vibration and noise, causing a decrease in bag width dimensional accuracy and degrading the quality of the bag. In order to prevent this from happening, the operator must constantly monitor the situation, leaving him with no time to focus on other tasks. In addition, if the printing pitch becomes short, it is difficult to numerically understand how much the above-mentioned extra feed amount (deviation ld) is.Therefore, the deviation amount d must be set large, In many cases, bag making is continued with the disadvantages of large amounts.

Conventionally, the film feed pitch was set by first turning the machine by hand or by inching the machine until the special handle for pitch adjustment could be inserted into the crank screw 39 built into the crank 36 as shown in Figure 3. 36, and use the special handle to adjust the approximate dimensions of the pinch while looking at the scale on the crank 36.Next, for the plain fill 1, in the bag making state, use the fine adjustment handle 13 for pitch adjustment shown in Figure 3 (0). While operating the machine, that is, while rotating the crank 36, one of the friction blocks 14, 15 fixed to the handle 13 is brought into contact with the spur gear 16 fixed to the end of the crank screw 39. By causing either left or right rotation, the crank screw 39 is rotated, and the nut block 40 and pin 41 screwed therein are moved up and down to slightly change the eccentricity of the crank 36. In this way, the bag is actually measured. While repeating the fine adjustment of the pitch, bring it close to the desired pitch (.On the other hand, for the printing film, without operating the photoelectric detector 45, use the same method as above to feed it slightly longer than the printing pitch. Next, the head of the photoelectric detector 45 is placed at a predetermined position on the passing line of the printed mark, and the photoelectric detector 45 is operated so that the electromagnetic clutch 2
8. The pitch was adjusted by controlling the electromagnetic brake 27.

However, there are complaints that this series of pitch adjustment tasks is not suitable for inexperienced operators or female operators. In addition, at this time, since pitching is performed while making bags, bag making losses occur.

[Means for solving problems]

The present invention eliminates this drawback, and uses a microcomputer-controlled drive device to adjust the intermittent film feed, and allows the film feed pitch (bag width dimension) to be set using the keyboard regardless of whether the machine is stopped or running. Alternatively, fine adjustments may be made, and in the case of printed film, automatic correction control of the film feed pinch is performed so that the best film feed is performed in accordance with the printing pitch.

That is, the first invention of the present invention provides the intermittent feed rollers 20 and 21 of the film 4, and the intermittent feed rollers 20 and 21 of the film 4.
0, 21 via an electromagnetic brake 27 and an electromagnetic clutch 28, a drive shaft 37 of the crank 36, and a device i for adjusting the eccentricity of the crank 36.
! In the film intermittent feeding unit 2 consisting of a drive shaft 37 and a device 39 for adjusting the amount of eccentricity of the crank, an adding mechanism 48 is provided between the drive shaft 37 and a device 39 for adjusting the amount of eccentricity of the crank.
This is achieved by inputting the movement of the drive device 49 under the control of.

Further, the second invention of the present invention provides the intermittent feed rollers 20 and 21 of the film 4, and the intermittent feed rollers 20 and 21 of the film 4.
, 21 via an electromagnetic brake 27 and an electromagnetic clutch 28, and a drive shaft 3 of the crank 36.
7, a device 39 for adjusting the amount of eccentricity of the crank 36, a photoelectric detector 45 for detecting the printed mark on the film 4, and a detection signal t from the photoelectric detector 45 for controlling the electromagnetic brake 27 and the electromagnetic clutch 28. Device 46 for high speed control
In the film intermittent feeding section 2 consisting of
An addition mechanism 48 is provided between the device 39 for adjusting the eccentricity of the crank 36, and the movement of the drive device 49 controlled by the microcomputer 80 is manually applied to the addition 4ff1wI48.
The microcomputer 80 also includes the feed rollers 20 and 21.
A signal S from the encoder 82 for detecting the intermittent feed amount and a signal S for setting the film feed deviation amount d are input.

Note that the addition mechanism 48 means a mechanical addition/subtraction mechanism, and includes an i-star gear mechanism, a differential mechanism, and the like.

〔Example〕

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

An addition mechanism 48 is provided between the drive shaft 37 and a device (screw) 39 that adjusts the amount of eccentricity of the crank 36, and the motion of the drive device 49 controlled by a microcomputer is input to this addition mechanism 48 to rotate the screw 39. The length of the intermittent feed of the film 4 is adjusted by changing the amount of eccentricity of the crank 36.

A sun gear 51 is fixed to the differential shaft 50 of the adding mechanism 48, and a pair of timing belt pulleys 52 are mounted on both sides of the sun gear 51.
, 53 are fitted together for rotation. Planetary gears 54, 54, which are pivotally supported on one timing belt pulley 52.
... are meshed with the outer periphery of the sun gear 51 and the inner periphery of an internal gear provided on the other timing belt pulley 53.

One timing reference in the adding mechanism 48
52 is a timing belt pulley 5 fixed to the drive shaft 37
5 by a timing belt 56.

The other timing belt pulley 5 in the addition mechanism 48
3B timing belt 60, pulley 61, intermediate shaft 62,
Sprocket wheel 6 Sprocket wheel 65 fitted to the shaft 37 for rotation
, gears 66, 67, and bevel gears 68, 69 to the screw 39.

A drive device 49 controlled by a microcomputer is connected to the differential shaft 50 of the addition mechanism 48 . That is, the differential shaft 50 is connected to a shaft 75 of a stamping motor 74 via a timing belt pulley 70, a timing belt 71, a timing belt pulley 72, and a shaft 73. On the other hand, the shaft 75 of the stamping motor 74 is connected to an encoder 81 that corresponds to the eccentricity of the crank 36 and converts the eccentricity into a rotation angle.

The microcomputer 80 has a shaft 75 of the stamping motor 74.
The eccentricity of the crank is connected in a 1:1 relationship and detected by converting it into a rotation angle, that is, the signal a of the absolute feed amount detection encoder 81 and the intermittent rotation angle of the shaft 22 of the feed rollers 20 and 21 shown in FIG. That is, a signal from the encoder 82 for detecting the intermittent feed amount of the film and a signal S for setting the deviation -jld are inputted, and the stethoping moke 74 is controlled by the output signal C thereof.

The microcomputer 80 controls the stamping motor 7 so that the absolute feed amount by No. 13a becomes the sum of the actual film feed amount B by the signal S and the deviation ld by the signal S (A = B + d).
Control 4.

Next, the operation of this device will be explained.

The rotational force of the drive shaft 37 is transmitted to the timing belt pulley 52 of the adding mechanism 48 via a timing belt pulley 55 and a timing belt 56. Further, the rotational force of the timing belt pulley 53 that rotates from the timing belt pulley 52 via the planetary gear 54 rotates the timing belt 60, pulley 61, intermediate shaft 62, sprocket wheel 63, chain 64, and drive shaft 37. Sprocket wheel 65, gears 66, 67, which are fitted together as best as possible
It is transmitted to the screw 39 via bevel gears 68 and 69. When the film feed pitch is constant and the film is being fed intermittently, the sprocket wheel 65 and the drive shaft 37 rotate together at a constant speed, and the screw 39 does not rotate.
The amount of eccentricity of the crank 36 is constant.

If the pinch of the printing mark on the film 4 fluctuates due to printing errors, film tension errors during printing, film elongation, etc., the signal from the photoelectric detector 45 or the signal from the timing cam attached to the drive shaft 37 of the crank 36 ( (not shown) changes the actual film feed amount B caused by the operation of the high-speed control device 46, and the absolute feed amount ff1A is determined by the eccentricity of the crank 36 at that time.
(Almost the same as the film feed amount for plain film)
This difference causes a difference from the deviation iJd which has been previously input from the keyboard into the microcomputer 80 as the amount to be fed in excess of the pitch of the printing marks on the film 4. That is, d=A-
Since B of B becomes B', it becomes d'-A-B'. In order to immediately return the deviation amount d' to the preset deviation amount d, the microcomputer 80 sends a signal C to the stepping motor 74 to rotate it and change the amount of eccentricity of the crank, in other words, change the absolute feed amount A. ', the deviation ld' is returned to the deviation ld, and the operation continues in the state of d=A'-B'. That is, the microcomputer 80 automatically corrects the deviation ff1d. Also, when the actual film feed pitch is changed due to film feed pitch setting or automatic adjustment based on microcomputer commands, the intermittent feed roller 20.
The rotation angle of 21 changes, and the signal level of encoder 82 changes. As a result, the microcomputer 80 generates an output No. 3 C corresponding to the amount of variation, and the stepping motor 74 rotates. Also, when the setting value of the extra feed deviation ld relative to the pitch of printing marks is changed, /l#B+d' will be obtained.
The microcomputer 80 generates an output signal C, and 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, and the timing belt pulley 70 of the timing belt 7L, and rotates the sun gear 51 of the adding mechanism 48. This amount of rotation is added to the rotation of the timing belt boot 1753, and the timing belt 60, pulley 61, intermediate shaft 62, sprocket wheel 63, chain 64, sprocket wheel 65 fitted to rotate on the drive shaft 37, gear 66, 6
7. Transmission is transmitted to the screw 39 via the bevel gears 68 and 69, and the rotation of the screw 39 operates the block 40 in its axial direction, changing the amount of eccentricity of the crank, and changing the amount of rotation of the sector gear 33 during forward rotation. It is made to fluctuate to follow the fluctuation of the feed pitch of the film 4. That is, in the case of a plain film, the film feed pitch changes, and in the case of a printed film, the film feed is automatically corrected so that the extra feed length (deviation ff1d) remains constant in response to a change in the printing pitch. Furthermore, if the program of the microcomputer 80 is changed so that the difference (ε) between the basic feed amount and the actual film feed amount is within the pre-specified tolerance range from 0, the basic feed amount will not change and the basic feed amount will be changed. When the difference (ε) between the actual film feed amount and the actual film feed amount is out of this range (a value between 0 and D), a pre-specified deviation amount d# is added or subtracted from this basic feed amount. good.

As described above, the microcomputer 80 automatically adjusts the amount of eccentricity of the crank 36 so that the extra feed of the film 4 (deviation ff1d) is always constant even when the printing pitch of the film changes. Therefore, there is no need to take safety precautions to prevent the risk of the light spot falling off from the printed mark, and the extra feed amount (deviation amount d) can be set to an extremely small value, so the electromagnetic clutch 28, a clutch that can operate the electromagnetic brake 27;

It extends the life of parts such as brakes, eliminates machine vibration and noise, increases bag width dimension accuracy, and improves bag quality.

5 to 7 show the specific mechanism of the present invention,
The same parts as in FIG. 1 are indicated using the same reference numerals. As shown in the figure, the addition mechanism consists of an adjacent timing belt pulley containing a small, hourly TT star gear, and is installed in a part of the drive system at a location away from the crank.

Therefore, the device of the present invention can be installed relatively easily and freely without having to complicately incorporate the planetary gear or differential gear train mechanism of the adding mechanism into the crank part, and can be installed relatively easily and without major modification to the conventional bag making machine. can be incorporated.

That is, since the structure is such that the components of the present invention are additionally attached to a conventional machine, the main frame and the like can be shared, making it practical to modify the hour wheel.

In addition, this device only requires intensive lubrication of the crank part, and most of the other drive systems can be left without any lubrication.

〔Effect of the invention〕

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 operate the machine whether it is stopped or running.

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

(3) The microcomputer automatically adjusts the amount of extra feed (deviation amount d) to remain constant even if the pitch and notch of the printing mark changes with respect to the printing film, so the light spot of the photoelectric detector moves away from the mark. It does not come off and can be accurately controlled by the photoelectric detector. This also eliminates the need for the operator to perform monitoring tasks, allowing the operator to do other work.

(4) Since the extra film feed (deviation ff1d) can be set to an extremely small value, the electromagnetic clutch and electromagnetic brake can be operated almost at the bottom dead center of the crank. Parts
It extends the life of the bag, eliminates machine vibration and noise, improves bag width dimension accuracy, and improves bag quality.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an outline of an embodiment of the present invention, Fig. 2 is an explanatory diagram showing an outline of a conventional bag making machine, Fig. 3 (a) is a front view of its crank, and Fig. 3 ( U) is A of the same (B)
A) 5 sectional view, FIG. 4 is a perspective view of the intermittent film feeding section, FIG. 5 is a side view of the specific mechanism of the main part of the present invention, and FIG.
The figure is a sectional view taken along line B--B in FIG. 5, and FIG. 7 is a sectional view taken along line C--C 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. Sengoku゛εne Ichimasa-y (Method) August 20, 1985

Claims (2)

[Claims] (1) Intermittent film feed consisting of an intermittent feed roller, a crank connected to the intermittent feed roller via an electromagnetic brake and an electromagnetic clutch, a drive shaft of the crank, and a device for adjusting the eccentricity of the crank. An automatic film feed pitch adjustment device comprising an adding mechanism provided between the drive shaft and a device for adjusting eccentricity of the crank, and inputting motion of the drive device controlled by a microcomputer to the adding mechanism. (2) An intermittent feed roller for the 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 eccentricity of the crank, and a printed mark on the film. In the film intermittent feeding section, which is comprised of a photoelectric detector that detects the oscillation and a device that controls the electromagnetic brake and the electromagnetic clutch at high speed based on the detection signal of the photoelectric detector, a device that adjusts the amount of eccentricity between the drive shaft and the crank; An adding mechanism is provided in between, and the movement of the drive device controlled by the microcomputer is input to this adding mechanism.The microcomputer also receives an encoder signal for detecting the intermittent feed amount of the feed roller and a signal for setting the film feed deviation amount. A film feed pitch automatic adjustment device that inputs the following information.