JP3222733B2 - Automatic connection device for packaging film in packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic connecting device for a packaging film for connecting the end of the film to be used and the leading end of the standby film when the film continuously supplied to the packaging machine is completed.

[0002]

2. Description of the Related Art Conventionally, in this type of packaging machine, as an apparatus for continuously supplying a packaging film at a constant speed and connecting the printing position of the film without shifting, for example, Japanese Patent Publication No. 52-45279. There is a publication. The technical contents disclosed in this publication include a first passage for guiding each of the films unwound from a pair of film rolls toward the center of the apparatus, and an end portion of the film provided on the first passage. And a holding plate provided on both sides of a second passage extending from the first passage for holding the film from both sides, and a lever operated to face a plurality of guide rolls. A plurality of dancer rolls, and a transmission for driving the lever at a different speed ratio according to a signal from the detection device. When the detection device detects that the end of one of the films has disappeared, the lever is moved to the first position. Operating at a lower speed to reduce the speed of the film in the first and second passages, and then operating the lever at a second faster speed to operate the film in the first and second passages. The speed of the film is set to zero, and the joint of the film is pressed for a long time. When the end of the film is detected, the film is pressed against the film by the brake roll provided on the first passage to reduce the tension. To give
The switching of the speed of the lever is such that the clutch disposed in the transmission is switched stepwise.

[0003]

However, in this conventional joining apparatus, the switching of the lowering speed of the lever operated at the time of the film joining is performed by a switching method using a clutch. When the feeding speed is high, sudden changes in the speed at the time of clutch switching may cause meandering due to the slack of the film, and the film may not be fed stably due to excessive film tension. There is a problem that a good film bonding without a defect cannot be achieved. Further, the film roll is completely detected and the end of the film is detected, and the brake roll provided in the first passage to the film joining portion is actuated and pressed against, and the film is joined in a state where tension is applied to the end of the film. Therefore, when the film feeding speed of the packaging machine is high, there is a time lag from the detection of the end of the film to the output of the operation signal to the brake roll. Since the film is pulled out in a state in which tension is not applied to the film over a range exceeding the range, the film meanders, and a print position detection failure occurs. There's a problem. The present invention has been made in order to solve the above-mentioned problem, and even when the film feeding speed is set to a high speed due to a high-speed operation of a packaging machine, a printing position shift occurs when the film is connected. It is an object of the present invention to provide a film connecting device for a packaging machine that can be performed accurately and satisfactorily.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned technical problems, the present invention provides a method for controlling the end of the film being fed and the standby side of the film being fed to the packaging machine. In the automatic packaging film connecting apparatus for connecting the starting end, a brake means and a first encoder are provided on a pair of holder shafts for holding the film roll being fed and the standby-side film roll. One encoder transmits a pulse about the rotation amount of the holder shaft, and the film feeding mechanism of the packaging machine is provided with a second encoder for transmitting a pulse about the film feeding amount. The current diameter of the film roll being fed is determined from the comparison to control the braking force of the brake means, and the pulse from the first encoder and the second encoder is controlled. If the diameter of the film roll being fed as determined by the number of comparison is equal to or less than the reference dimension,
Along with the film feed speed being transmitted from the film roll being fed at the time of film connection by transmitting a film end signal and being reduced to a predetermined low speed, control means for increasing the braking force of the brake means is provided. In a film connecting portion for connecting the end side of the film being fed and the start end of the standby film, a pair of pressure rollers for sucking and holding the start end of the standby film are connected to and separated from each other via a pressure roller operating portion. A film cutting device is provided between the film roll and the film connection portion to cut the film being fed in time with the film connection at the pressure roller operating portion and serve as a film end portion. The film feeding path between the film connecting portion and the film feeding mechanism of the packaging machine is driven via a rotational force transmission mechanism from the film feeding mechanism, and A differential pulley mechanism composed of a moving pulley for winding the film and a fixed pulley is provided, and a registration mark attached to the film is detected on a film feeding path between the film connecting portion and the moving pulley. A registration mark sensor is provided, and the differential pulley mechanism, when the moving pulley moves close to the fixed side pulley, the film feeding speed at the film connecting portion from a gentle deceleration to a predetermined low speed. Further, the film speed is changed from the gentle acceleration to the original film feeding speed. At a low speed, a signal from the registration mark sensor is received and the pressure roller is pressed and operated to feed the film being fed and the standby film. When the moving pulley separates from the fixed pulley, it returns to the initial position with the slowest movement at the slowest speed. Sometimes, the film feeding speed at the film connecting portion is reduced through the differential pulley mechanism without changing the film feeding speed by the film feeding mechanism of the packaging machine, and the film being fed and the standby side are Therefore, even when the film feeding speed of the packaging machine is set to a high speed, the registration marks of both films can be connected accurately without displacement. Further, prior to film connection, when the film feeding speed of the film connecting portion is reduced from the film feeding speed of the packaging machine, the braking force of the film roll against the holder shaft is increased in accordance with the film reduction ratio. As a result, the pulling tension of the film drawn from the film roll during feeding is made substantially the same as that at the normal time, and the film is prevented from being stretched or meandered due to excessive tension or slack of the film, and the film is connected accordingly. Failure can be prevented beforehand. Further, an electromagnetic clutch / brake and a differential gear mechanism are provided in a rotational force transmitting mechanism interposed between the film feeding mechanism and the driving section of the differential pulley mechanism. Upon receiving the film end signal from the control means, the brake is turned off, the clutch is turned on, and the rotational force from the film feeding mechanism is transmitted to the drive unit of the differential pulley mechanism via the differential gear mechanism. Also, the electromagnetic clutch / brake receives a signal indicating that the moving pulley is located at the end of movement, turns off the clutch and turns on the brake, and at the same time through a moving pulley returning motor connected to a differential gear mechanism. The moving pulley is returned from the moving end position to the initial home position at a very low speed, so that the film roll diameter during feeding becomes smaller than the reference size. On the basis of the end signal, the clutch is turned on to operate the drive unit of the differential pulley mechanism to connect the film being fed and the standby side film at the film connecting portion, so that the end of the film being fed is at the end. In the free state, it is possible to prevent poor connection due to meandering of the film and the like. Further, the differential pulley mechanism includes a pair of movable pulleys laid laterally on a slide means and a fixed pulley disposed at a moving end side of the movable pulley, winds the film, and winds the film around the drive unit. A transmission drive means is interposed, and the winding transmission means is slidably connected to a slide groove vertically provided on the slide plate to slide the drive pulley so that the movable pulley can reciprocate between an origin position and a movement end position. In the course of this forward movement, the length of the film is shortened and the film feeding speed at the film connecting portion is reduced to a low speed.
Since the detection means for detecting the arrival of the movable pulley at the movement end position and the return from the movement end position to the origin position is provided, the film feeding speed at the film connection portion is moderate. Since the speed is changed from the deceleration to a predetermined low speed and the gradual acceleration to the original film feeding speed, the tension of both connected films is maintained at a substantially constant state in conjunction with the control of the braking means. As a result, the film does not meander before and after the connection, and the registration mark can be accurately positioned during the low-speed feeding of the film.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings. This film connecting apparatus 1 comprises a film roll holding mechanism 2, a film connecting section 30, and a differential pulley mechanism 90. As shown in FIGS. 1 and 2, the film roll holding mechanism 2 is provided with holder shafts 4a and 4b for removably mounting the film rolls FA and FB at predetermined intervals from one side of the machine frame 3. The film fa of the film roll FA is provided on the holder shaft 4a side of the machine frame 3.
The guide rollers 5a, 5b, 5c, 5d are arranged, and the brushes 7 are provided on the guide rollers 5c in a pair. Similarly, guide roller rows 8a, 8b, 8c, 8d, 8e for guiding the film fb of the film roll FB are also provided on the holder shaft 4b side, and the brush 7 is similarly provided on the guide roller 8c. It is provided in. The holder shafts 4a, 4 thus arranged
B is provided at one end side with a brake means 18 for pulling out a film, such as a powder brake, for example.

As shown in FIGS. 3 to 5, the brake means 18 is attached to one end of each of the holder shafts 4a and 4b. 4 and 5 show the holder shaft 4b side. The holder shaft 4b is formed in a hollow cylindrical shape as shown in FIG.
Is rotatably supported between a support plate 11 and a bearing housing 1 attached thereto.
2 is mounted in an inner fitting manner, and a shaft pin 13 is rotatably mounted at the center of the bearing housing 12. A gear 14 having a predetermined number of teeth is fixed to an end of the bearing housing 12. The shaft pin 13 attached to the bare link housing 12 is fixedly attached to one end of a connection plate 16 attached to the support plate 11 with an adjustment bolt 15. A holder plate 17 is suspended from the connection plate 16, and a brake means 18 is attached to a predetermined position of the holder plate 17. A rotating shaft 19 of the brake means 18 has a gear attached to the bearing housing 12. A gear 20 having a predetermined number of teeth meshingly connected with the gear 14 is mounted, and a timing pulley 21
Is installed.

[0007] A bracket 22 is attached to the lower end of the holder plate 17, and a first encoder (first pulse transmitter) 23 is attached to the bracket 22, and a rotary shaft 24 of the first encoder 23 is attached. The timing pulley 2 attached to the rotating shaft 19 of the braking means 18
1, a timing pulley 25 is attached, and a timing belt 26 is provided between the timing pulleys 21 and 25.
Is mounted. The brake means 18 and the first encoder 23 provided in this way are also provided on the holder shaft 4a side, and each of the brake means 18 and the first encoder 23 is connected to the control means, and is connected to the holder shaft 4a or the first encoder 23. It is provided to detect the rotation of the holder shaft 4b and transmit the number of pulses to the control means. The brake means 18 is provided so that the film fa being fed is pulled out at a predetermined tension and the rotational inertia of the film roll FA is braked. This braking action is performed by detecting the rotation of the holder shaft 4a. 1 at a predetermined time (every few seconds) according to the diameter of the film roll FA obtained from the encoder 23 and the number of pulses from the second encoder 174 for detecting the rotation of the feeding roller 162 of the film feeding mechanism 160 of the packaging machine described later. ) Is set so as to change the braking force of the brake means 18 on the holder shaft 4a. Further, after the film end is detected, the moving pulleys 108 and 109 start moving, so that the film roll FA
When the film fa is pulled out from the high speed to a low speed, the film roll FA is prevented from rotating excessively due to the rotational inertia, and the braking force is applied so that the film fa is pulled out with a constant tension applied. Is set to be large.

A machine frame 28 is disposed between the holder shafts 4a and 4b as shown in FIGS. 7 to 10, and the side frames 28a and 28b are opposed to each other by a plurality of stays 29 at a predetermined interval. Further, the side frame 28a is formed lower than the side frame 28b, and the side frame 28a is provided so as to be located inside the lower part of the machine frame 3 of the film roll holding mechanism 2. A film connecting portion 30 is disposed substantially at the center of the machine frame 28 provided as described above, that is, substantially at the center of the holder shafts 4a and 4b, and a differential pulley mechanism 90 is provided below the film connecting portion 30. Are arranged in the same machine frame 28.

The film connecting part 30 is composed of two pressure rollers 31a and 31b and a film holding part 60 disposed on the upper part thereof. This pressure roller 31a,
Numerals 31b are arranged in parallel at a predetermined interval between the upper central portion of the side frame 28b and a predetermined position of the machine frame 3 as shown in FIG. That is, the pressure rollers 31a and 31b include a cylindrical roller body 32 having a predetermined diameter and an eccentric roller shaft 33, and a rubber 34 having a predetermined thickness is provided around the roller body 32.
Are adhered, and a plurality of suction holes 35 for sucking and holding the film f are formed in a predetermined angle range of the main body 32. The roller shaft 33 has a predetermined length, and a hole 36 opened at one end is formed at the center thereof.
The holes 36 are provided with suction holes 37 having a predetermined diameter and opening in the outer periphery in a line. Further, at predetermined positions on the left and right sides of the roller shaft 33, the eccentric convex circular portion 3 eccentric to the suction hole 37 side.
8 are formed. The roller shaft 33 is inserted into the roller body 32 thus formed, and a bearing 39 is fitted between the eccentric convex circular portion 38 of the roller shaft 33 and the roller body 32.

The pressure rollers 31a,
The eccentric roller shaft 33 of the eccentric roller 31b has a closed end portion on the side frame 2 side.
The roller shaft 33 is rotatably supported on a bearing 40 provided at a predetermined interval above the upper portion 8b, and on a bearing 41 provided on the machine frame 3 side in correspondence with the bearing 40. 3 and 6, a pressure roller operating portion 45 is connected to the open end side. The pressure roller operating section 45 is provided on the lower surface side of a support plate 46 provided in a protruding manner at a predetermined position of the machine frame 3, and the pressure roller 31 a, as shown in FIG.
At the displaced position outside the eccentric roller shaft 33 of the eccentric member 31b, stopper members 47 and 48 having a substantially L-shaped cross section are vertically provided in opposite directions. The stopper member 47 is on the side of the pressure roller 31a, and the stopper member 48 is on the side of the pressure roller 31b. Corresponding to the stopper members 47, 48, the solenoids 50a, 50a,
The electromagnetic solenoids 50a, 50b
One ends of operating rods 52a, 52b are pivotally connected to each other via an operating shaft 51, and the two operating rods 52a, 52b are connected to pieces 47a, 48a of stopper members 47, 48, respectively.
The nuts 53a for preventing the electromagnetic solenoids 50a and 50b from being excited when the electromagnetic solenoids 50a and 50b are not excited and the adjusting nuts 53b for setting the open positions of the pressure rollers 31a and 31b are screwed in front and behind the pieces 47a and 48a. The operating levers 54a and 54b are provided on the adjustment nut 53b side.
, The adjustment spring 57 having a predetermined spring pressure and the washer 56b are inserted, and the nut 53c for adjusting the spring pressure is screwed. Further, each of the operating rods 52a, 52b is actuated. Pieces 47b, 48 of the other stopper members 47, 48
There is provided a tension spring 59 having a predetermined spring pressure, which is elastically attached between the hook bolt 58 attached to b.

The pressure roller operating section 4 provided as described above
5, the electromagnetic solenoids 50a, 50b are normally used.
Is turned off, the operating shaft 51 is pulled by the tension spring 59, and the operating levers 54a and 54b are held in the illustrated and expanded shape at a predetermined angle as shown in FIG. 3, and the pressing rollers 31a and 31b are in this state. When the electromagnetic solenoids 50a and 50b are excited in parallel at predetermined intervals, the operating rods 51a and 52b and the tension spring 59 are pulled by the operating shaft 51, and the operating levers 54a and 54b are retracted at a predetermined angle. The pressure rollers 31a and 31b are provided so as to be rotated by a predetermined angle to press the rollers 31a and 31b via the eccentric convex circular portion 38 of the roller shaft 33.
The roller shaft 3 of the film connecting portion 30 provided in this manner.
Although not shown, the open end of the film 3 is switchably connected to a suction source such as a blower and the like, and the film f on the standby side is connected.
It is provided so as to adsorb the connection start end of b. Also,
A film holding section 60 is disposed above the pressure rollers 31a and 31b.

As shown in FIGS. 1, 2 and 14, the film holding portion 60 is provided above the press rollers 31a and 31b from a predetermined position of the machine frame 3 as desired. A shaft holder 61 is attached at a predetermined height at a predetermined interval, and a shaft 62 is suspended between the holders 61. The shaft 62 has a cover plate 63 having a predetermined width so as to be able to jump upward. Are provided in a cantilever manner, and a brush holder 64 is attached along both longitudinal edges of the cover plate 63.
The brush holder 64 has a mounting piece 6 as shown in FIG.
5 and a substantially mountain-shaped holder portion 66, and a brush 67 is mounted in the longitudinal direction of the end portion of the holder portion 66 on the path of the films fa and fb so as to be directed to the lower surface side of the cover plate 62. I have. A film retainer 68 is provided at the edge of the cover plate 63 so as to be folded toward the lower surface. The film holding unit 60 provided in this manner
Is provided so that tension is applied by the brush 67 and the film presser 68 when the final end on the film end side is moved.

The pressing roller 31a, the guide roller 5d, and the pressing roller 31b on the side of the film holding section 60.
As shown in FIG. 11, a cover 69 for forming a path for the films fa and fb is provided between the guide rollers 5d and 8e. The guide rollers 5d and 8e are located at predetermined positions close to the guide rollers 5d and 8e. A film cutting device 70 is provided in parallel with 8e. As shown in FIGS. 11, 12, and 13, the cutting device 70 has a lever shaft 71 rotatably supported at a predetermined height between the machine frame 3 and the side frame 28b. An operating cylinder 73 is attached to the machine frame 3 at a lower position at a predetermined distance from the extension of the lever shaft 71 with a rod facing upward via a support bracket 72. A knuckle plate 74 that is horizontally moved via a guide pin 75 is attached. An operating lever 76 is attached to the extending end of the lever shaft 71, and the operating lever 76 is connected to a knuckle plate 74 via a turnbuckle 77.

A guide rail 78 having a concave guide groove 79 is mounted at a predetermined position on the opposing surface of the machine frame 3 and the side frame 28b, which is aligned with the center of the working cylinder 73, corresponding to the vertical direction. A knife 80 is removably mounted between the guide rails 78 via a trochanter 82 pivotally attached to both ends of a knife holder 81 to which a knife 80 is detachably attached. In this example, three supporting members 83 are mounted. One end of a turnbuckle 84 is pivotally attached to each of the supporting members 83, and the lower end of each turnbuckle 84 is provided at a predetermined position corresponding to the lever shaft 71. It is pivotally connected to a lever 85 mounted at an angle. As shown in FIG. 12, a knife cover 86 having a slit groove 87 for inserting the knife 80 is provided on the upper side of the knife holder 81, and a knife receiver 88 is provided on the upper side at a predetermined interval. I have.
The film cutting device 70 provided in this manner is provided so as to cut the films fa and fb at a predetermined time by the operation of the operation cylinder 73.

The film connecting portion 30 provided as described above
Between the side frames 28a and 28b on the lower side of the pulley mechanism 9
0 is provided. The differential pulley mechanism 90 includes a drive plate 125 driven by a differential gear mechanism 185, which will be described later, and a guide plate 110 and a slide plate 112 on which a pair of movable pulleys 108 and 109 vertically moved by the drive unit 125 are mounted. And a detecting unit 140 for detecting the movement of the moving pulleys 108 and 109.

Next, the differential pulley mechanism 90 will be described with reference to FIGS.
A handle shaft 91 is rotatably supported directly below 31b. The handle shaft 91 is rotatably supported by the guide rollers 9.
2a, bevel gears 93a are mounted on the handle shafts 91 on both sides of the guide roller 92a, and bevel gears 9 are mounted on the left and right side frames 28a, 28b as shown in FIG.
A screw shaft 94 provided with a bevel gear 93b meshing with 3a is rotatably provided horizontally via a holder, and a substantially L-shaped support member 95 is screwed to the two screw shafts 94. A roller shaft 96 is suspended between the support members 95, and a guide roller 92b is rotatably mounted on the roller shaft 96. A handle 97 is attached to the end of the handle shaft 91 on the side frame 28b side. By operating the handle 97, the guide roller 92b is moved, and in accordance with the registration mark pitch printed on the film fa. By adjusting the position, the distance between the guide roller 92b and the registration mark sensor 151 provided on the downstream side in the film feeding direction is changed, and the registration mark detection position and the registration mark position of the film fb sucked by the pressure roller 31b are changed. Are provided so as to be aligned.

Guide rail portions 100 and 101 of movable pulleys 108 and 109 are provided at predetermined positions below the side frames 28a and 28b. This guide rail part 100,
As shown in FIGS. 9 and 10, reference numeral 101 denotes a movable rail in which the movable pulleys 108 and 109 can be moved between their original positions a and movable end positions b. Rail members 102a and 102b are horizontally disposed at predetermined intervals above and below a predetermined height position inside the side frame 28a, and a guide groove 103 is formed between the two rail members 102a and 102b. A guide rail portion 100 is provided on the outer surface of the side frame 28a.
A rail member 105 which constitutes a rolling guide mechanism 104 is arranged in alignment with the center of the guide groove 103, and the roller shafts of the movable pulleys 108 and 109 are located at predetermined upper and lower positions around the rail member 105 of the side frame 28a. A guide slot 107 for guiding the insertion of the guide hole 115 is provided. Movable pulleys 108 and 109 are provided between the guide rail portions 100 and 101 provided as described above.

The moving pulleys 108 and 109 are shown in FIGS.
Guide plate 11 on the guide rail section 100 side as shown in
0 and the slide plate 112 on the guide rail portion 101 side. The guide plate 110 is formed in a substantially rectangular plate shape, and a guide groove 103 is formed in the center of one surface thereof. A moving trochanter 111 is pivotally mounted.
Further, the slide plate 112 is formed in a substantially rectangular plate shape larger than the guide plate 110, and bearing blocks 113a, 113b forming a rolling guide mechanism 104 by rail members 105 at predetermined intervals before and after one surface thereof. Is installed. Guide plate 11 provided in this way
Above and below the slide plate 112 and the slide plate 112, stays 114 inserted at intervals matching the guide elongated holes 107 are laid and connected, and upper and lower stays 114 and upper and lower roller shafts 115 are connected at predetermined intervals. On the upper and lower roller shafts 115, movable pulleys 108 and 109 are rotatably supported. Also, at a predetermined position on the outer surface of the slide plate 112, an operation member having an operation groove 117 having a substantially U-shaped cross section is provided in order to move the movable pulleys 108 and 109 in connection with the slide drive roller 138 of the drive unit 125. 116 are provided.

As shown in FIG. 9, a tension pulley 118 (also referred to as a fixed pulley) is disposed at a position separated by a predetermined distance from the movement end position b of the upper and lower movable pulleys 108 and 109. The tension pulley 118 turns the film fa wound around from the moving pulley 108 side to the folding pulley 118 and winds the film fa toward the moving pulley 109, and is attached to a predetermined position below the left and right side frames 28a and 28b. Roller shaft 121 mounted between the ends of a lever 120 of a predetermined length pivotally mounted on the bearing 119
The tension pulley 117 is rotatably mounted, and the lever 120 is urged by a spring 122 so that it can swing about a bearing 119 between stopper rubbers 123 provided on, for example, one side frame 28b. Is provided.

The moving pulleys 108, 109 thus arranged
A drive section 125 is provided on the side of the slide plate 112. The drive unit 125 is positioned with respect to the side frame 28a.
The drive shaft 12 is provided on a support frame 127 erected at a predetermined interval via a 126, and is aligned with a center of the rail member 105 of the rolling guide mechanism 104 of the support frame 127.
8 is rotatably provided via a bearing 129, and the drive shaft
At a position spaced from the drive frame 128 by a predetermined distance, the support frame 127 is provided horizontally on the side of the support frame 127 and is screwed to the screw rod 130 to drive the drive shaft.
A driven shaft 131 is provided corresponding to the distance between the driven shaft 131 and the support frame 127 so as to be adjustable through a long hole provided in the support frame 127. An intermediate chain wheel 132 linked to the differential gear mechanism 189 and a branch chain wheel 133 linked to the detection section 140 are detachably fastened to the outer end of the drive shaft 127. A drive wheel 134 having a predetermined number of teeth is fixed to the inner end of the driven shaft.
131 has a driven sheave 135 with the same number of teeth
Is rotatably pivoted, and an endless chain 136 is mounted on both chain wheels 134 and 135, and the chain 136
A roller holder 137 is attached to one of the chain links, and a slide plate 112 is attached to the roller holder 137.
A slide drive roller 138 that rolls up and down along an operation groove 117 of an operation member 116 attached to the camera is mounted. The upper and lower movable pulleys 108 and 109 connected to the driving unit 125 in this way are always located at the origin position a via the slide plate 112.

At a predetermined position between the drive shaft 128 and the driven shaft 131, a support frame 141 of the detection unit 140 is formed in an overhanging shape, and the center of the drive shaft 128 and the center of the driven shaft 131 of the support frame 141 is formed. A detection shaft 142 is rotatably supported on the connecting line, and the detection shaft 142 has a branch chain wheel attached to a drive shaft 128.
A detection chain wheel 143 and a plurality of timing detection disks 144a, 144b, 144c are mounted in correspondence with 133, and a photoelectric sensor 145 is opposed to each of the timing detection disks 144a, 144b, 144c. A chain 146 is mounted on the detection wheel 143 and the branch wheel 133, and a tension roller 148 is disposed between the wheels 143 and 133 via a stay 147 having a long hole.

As shown in FIGS. 7 and 8, a stay 149 is laid horizontally at a predetermined position between the side frame 28b on the upper side of the drive shaft 128 and the machine frame 3, and a side frame 2 of the stay 149 is provided.
A registration mark sensor (emitter / receiver) 151 for detecting a registration mark of the film fa wound around the moving pulley 108 from the guide roller 92b which is moved and adjusted by a manual operation via the supporting member 150 is provided closer to 8b. It is arranged.

A film roll FB for connection and standby is mounted on one holder shaft 4b of the film roll holding mechanism 2 provided in this manner, and the film fb is shown in FIG.
As shown in FIG. 15, the guide rollers 8a to 8e are wound and inserted into the film holding section 60. For example, a single-sided adhesive tape 153 is attached to the start end of the film fb as shown in FIGS. And the starting end of the film fb is aligned so that the registration mark is at a predetermined position.
It is sucked by the blower 152 into the suction hole 35 of the pressure roller 31b and is held on standby. Further, the film fa of the other film roll FA is wound around the guide roller rows 5a to 5d and inserted into the film holding section 60, further inserted between the pressure bonding rollers 31a and 31b, pulled out downward, and further guided. It is wound around rollers 92a and 92b. Then, it is inserted into the registration mark sensor 151 and is further folded back from the upper movable pulley 108 to the tension pulley 118, wound around the lower movable pulley 109, and folded back again to the tension pulley 118 side. Guide rollers 154a, 154 disposed behind
The film is fed to the film unwinding mechanism 160 of the packaging machine through b, and a sensor 155a for detecting a film break such as a connection failure when the film fa and the film fb are connected as shown in FIG. And a detection piece 155b.

The film feeding mechanism 160 is disposed between the machine frames 159a and 159b as shown in FIGS. 16 and 17, and the film fa fed from the differential pulley mechanism 90 side.
Is a guide roller row 161a, 1 disposed between the machine frames 159a, 159b.
Upper and lower feed rollers 162, 163 via 61b, 161c, 161d, 161e
The film fa is drawn out from the film roll FA by driving the feeding rollers 162 and 163, and is supplied to a bag making machine (not shown) through the feeding rollers 162 and 163 and further through the guide rollers 161f, 161g and 161h. Sent. Each guide roller is freely pivotally mounted on the shaft.

The feed roller 162 is on the driving side, and the feed roller 163 is on the driven side.
Reference numeral 163 denotes a rubber roller having a shaft baked with rubber, and an upper feed roller 162 is formed as a groove roller having a plurality of grooves formed on the outer periphery thereof at predetermined intervals, and a roller shaft 164 of the upper feed roller 162 is formed. Handle at the end on the machine frame 159b side
165 is mounted, and the feed roller is operated by operating the handle.
The roller shaft 164 is extended from the machine frame 159a, and a timing pulley is
166, 167, 168 are attached.
Is connected to a feeding roller driving unit 170.

The feed roller driving section 170 is disposed on the side of the machine frame 159a and includes a driving motor 171 and a belt pulley row 172 connected thereto.
And endless timing belt 17 on timing pulley 166
3 are connected so as to drive the feeding rollers 162 and 163. Also, as shown in FIG.
At a predetermined position on the 159a side, a second encoder (second pulse transmitter) 174 is disposed, and a rotation shaft 17 of the second encoder 174 is provided.
5 is provided with a timing pulley 176 corresponding to the timing pulley 168 of the roller shaft 184, a timing belt 177 is mounted on the timing pulleys 168 and 176, and the second encoder 174 is connected to control means. ,
For example, the number of pulses from the first encoder 23 for detecting the rotation of the holder shaft 4a, which is provided on the holder shaft 4a loaded with the film roll FA being fed, and the rotation of the feeding roller 162 are detected. When the diameter of the film roll FA obtained from the number of pulses from the second encoder 174 becomes smaller than the reference size, the control means is set to transmit a film end signal.

The timing pulley 167 attached to the roller shaft 184 transmits a rotational force to the differential pulley mechanism 90 side. As shown in FIG. A clutch / brake 178 is provided, and a timing pulley 180 and a drive chain wheel 181 are attached to a rotating shaft 179 of the clutch / brake 178. A timing pulley of the timing pulley 180 and the roller shaft 164 is provided.
An endless timing belt 182 is engaged with the 167,
The timing pulley 180 is always idle with respect to the rotating shaft 179. Also, this electromagnetic clutch / brake 17
8 and slide plate 112 provided with moving pulleys 108 and 109
A differential gear mechanism 185 is provided between the drive unit 125 and the drive unit 125.

A differential gear is interposed between an input shaft 186 and an output shaft 187 of the differential gear mechanism 185, and a drive chain wheel 181 of an electromagnetic clutch / brake 178 is provided on the input shaft 186.
In response to this, the driven chain wheel 188 is fixed and the input shaft
The ring gear 189 is provided with a ring gear 189 of a differential gear so as to be able to idle, and the ring gear 189 has a gear 192 attached to the rotating shaft 191 of a return motor 190 for returning the movable pulleys 108, 109 to the initial origin position a. Meshed and linked, driven sheave 188 and drive sheave 18 of electromagnetic clutch / brake 178
An endless chain 193 is mounted on 1. The output shaft 187 has a driving unit 125 of the slide plate 112.
A chain wheel 194 is fastened in correspondence with the intermediate chain wheel 132, and an endless chain 195 is mounted between the chain wheels 194 and 132. The differential gear mechanism 185 arranged in this way transmits the torque from the feed roller 162 to the input shaft 186 via the clutch / brake 178 due to the clutch ON / OFF operation of the electromagnetic clutch / brake 178. The transmission pulleys 108 and 109 attached to the slide plate 112 are transmitted from the input shaft 186 to the output shaft 187 via a differential gear, and further transmitted to the drive unit 125 from the output shaft 187, so that the original position a The electromagnetic clutch / brake 178 is turned off and the brake is turned on when the end position b is reached. When the end position b is reached, the transmission of the rotational force from the feed roller 162 is interrupted. As a result, the return motor 190 is started, and its rotational force is transmitted from the ring gear 189, the differential gear and the output shaft 187 to the drive unit 125, and the movable pulleys 108 and 109 are provided so as to return from the end position b to the original position a. ing.

Next, the connection between the film fa being fed and the film fb in the standby state by the film connecting device 1 constructed as described above is shown schematically in FIG.
22 and FIG. 22 showing an operation chart, the film fa of the film roll FA is being fed, the film roll FB is on standby, and the film f
The starting end of b is a single-sided adhesive tape 15 as shown in FIGS.
3 is adhered and held by suction at the pressure roller 31b via the suction hole 35 with the bonding surface facing outward.
In the differential pulley mechanism 90, the moving pulleys 108, 10
Reference numeral 9 denotes an origin position a, and the film fa is wound and held at a predetermined winding length between the tension pulley 118 and the tension pulley 118, the driving unit 125 is in a stopped state, and the film fa is a film feeding mechanism 160 on the packaging machine side. The feed rollers 162 and 163 rotate to feed the bag at the predetermined feeding speed to the bag making machine side.
The brake of the electromagnetic clutch / brake 178 linked by 182 is turned on, the clutch is turned off, and the timing pulley 180 is idling with respect to its rotating shaft 179.

In the process of feeding the film fa, the rotation of the holder shaft 4a loaded with the film roll FA is detected by the first encoder 23, and the rotation of the feeding roller 162 is detected by the second encoder 174. The film end signal is transmitted from the control means in a state where the diameter of the film roll FA obtained from the number of pulses from the encoders 23 and 174 is smaller than a predetermined size. The connection operation of each mechanism is started based on the film end signal. That is, the registration mark sensor 151 disposed on the operation pulley mechanism 90 in response to the film end signal.
When the first registration mark m1 is detected, the clutch of the electromagnetic clutch / brake 178 is turned on, the brake is turned off, and the rotational force from the feed roller 162 is driven by the differential pulley mechanism 90 via the differential gear mechanism 185. The drive shaft 128 is rotated by the drive shaft 128 so that the chain 136 mounted on the drive sheave 134 and the driven sheave 135
The slide plate 112 starts moving toward the tension pulley 118 together with the upper and lower moving pulleys 108 and 109 via the slide driving roller 138 attached thereto, and at the same time, increases the braking force of the brake means 18 disposed on the holder shaft 4a side. That is, after the film end is detected, when the moving pulleys 108 and 109 start moving, the speed of pulling out the film fa from the film roll FA is changed from a high speed to a low speed, the rotational inertia of the film roll FA is changed. And prevents the film fa from being pulled out while a constant tension is applied to the film fa.

The driving unit 125 of the differential pulley mechanism 90
Is operated, the origin position a of the movable pulleys 108 and 109 is
On the other hand, the slide drive roller 138 is moved downward along the operation groove 117 by rotating from the initial position p1 to the position p2, whereby the slide plate 112 is also moved, and the movable pulleys 108 and 109 are moved to the position a '. As a result, the winding length of the movable pulleys 108 and 109 and the tension pulley 118 is reduced, and the film speed at the film connecting portion 30 is gradually reduced. And the slide drive roller 13
Moving pulley in the section where 8 moves from position p2 to position p3
108 and 109 are moved at a constant speed from the position a 'to the position b', whereby the winding length of the film fa is also reduced to a constant value, and the film speed of the film connecting portion 30 is also reduced to a constant value. The section between a 'and b' is called a constant deceleration area. Then, the film fa and the film fb are connected while the moving pulleys 108 and 109 move in the constant deceleration regions a 'and b'.

The constant deceleration regions a 'and b'
8, 109 during the movement of the film fa, the speed of the film fa passing through the film connecting portion 30 is controlled by the film feeding mechanism 16 of the packaging machine.
0, the film feed speed is reduced to about 1/3 of the film feed speed, and then, for example, a film end signal is transmitted in timing, and the registration mark sensor 151 detects the first registration mark m1. In response to the detection signal that has detected the second registration mark m3, first, the braking of the holder shaft 4a of the film roll FA by the brake means 18 is released, and the electromagnetic solenoid of the pressure roller operating portion 45 disposed in the film connection portion 30 is released. 50a and 50b are operated, whereby the pressure roller 31 provided eccentrically is provided.
a and 31b are pressed against each other via the operation levers 54a and 54b, so that a single-sided adhesive tape is attached to the pressure roller 31b.
The film fb in the stand-by state, which is held by suction with the adhesive surface of 153 facing outward, is connected to the film fa being fed through the single-sided adhesive tape 153. Slightly after this connection timing, the film cutting device 70 disposed in the film feeding path between the film roll FA and the film connecting section 30 is operated, and the end of the film fa is cut off, and the film fa is cut off. The film fb is drawn out after being aligned with the registration mark position of the waiting film fb.

When the slide drive roller 138 rotates from the position p3 to the position p4 after passing through the constant deceleration areas a 'to b', the movable pulleys 108 and 109 reach the end position b.
The position p4 of the slide drive roller 138 is a drive unit.
For example, the timing is detected by a timing detection disk 144a and a photoelectric sensor 145 provided in a detection unit 140 provided in the sensor 125, and the brake of the electromagnetic clutch / brake 178 is turned on by this detection signal, the clutch is turned off, and the film is fed out. The transmission of the rotational force from the mechanism 160 is cut off, and at the same time, the return motor 190 connected to the ring gear 189 of the differential gear mechanism 185 is activated, and the driving unit 125 is driven via the differential gear mechanism 185. In the slide plate 112, the slide drive roller 138 is rotated at a very low speed from the position p4 to the original position p1, and the movable pulleys 108 and 109 are moved to the original origin position a, so that the film fb is wound around a longer length. The speed of the film fb 30 is gradually accelerated, and when the moving pulleys 108 and 109 return to the origin position a, the film fb returns to the original film feeding speed. It is.
This origin return is detected by, for example, the timing detection disk 144b and the photoelectric sensor 145 provided in the detection unit 140, and the return motor 190 is stopped by this detection signal, and the film f
The connection between a and the film fb is completed. Thereafter, the film rolls FA and FB are alternately connected by the above-described control and operation, and are continuously fed to the packaging machine. In the above embodiment, the detection unit 140 for detecting the origin position a and the movement end position b of the movable pulleys 108 and 109 is provided on the drive unit 125 side. However, the present invention is not limited to this. Origin position a and moving end position b of the pulleys 108 and 109
May be provided with a detection sensor for detecting the state.
In addition, the drive sheave 13 is used to operate the slide plate 112.
4, the chain 136 is mounted on the driven chain wheel 135 and the chain 13
6, a slide drive roller 138 is provided. However, the present invention is not limited to this.
The 135 and the chain 136 may be a general winding transmission mechanism. Further, the holder shafts 4a and 4b are provided with brake means such as a powder brake for controlling the braking force and increasing the braking force by the film end signal.
The invention is not limited to this, and it is essential that the brake means be capable of providing the same control to the holder shafts 4a and 4b.

[0034]

As described above, since the present film connecting apparatus is constructed as described above, it does not change the film feeding speed by the film feeding mechanism of the packaging machine at the time of connecting the film, but through the differential pulley mechanism. When the film feeding speed of the packaging machine is set to high because the feeding film and the standby film are connected while the film feeding speed at the film connecting part is set to low speed Even in this case, the registration marks of the film being fed and the film being on standby can be connected with high accuracy without displacement. The rotation of the holder shaft loaded with the film roll of the film being fed is detected by the first encoder, and the rotation of the feeding roller of the film feeding mechanism of the packaging machine is detected by the second encoder. When the diameter of the film roll being fed, which is obtained by comparing the number of pulses from the film roll, becomes smaller than the reference size, the control means is set to transmit a film end signal, and based on this end signal, Is connected, it is possible to prevent a poor connection due to the meandering of the film and the like due to the free end of the film being fed. Further, the feeding speed of the film during feeding at the film connecting portion accompanying the film connection is set so as to shift from gentle deceleration to a predetermined low speed, and from gentle acceleration to the original film feeding speed. Therefore, the tension on the film is maintained at a substantially constant state, the meandering of both films before and after connection does not occur, and the registration of the registration mark can be accurately connected during the low-speed feeding of the film. Further, prior to film connection, when the film feeding speed of the film connecting portion is reduced from the film feeding speed of the packaging machine, the braking force of the film roll against the holder shaft is increased in accordance with the film reduction ratio. By adjusting the drawing tension of the film drawn from the film roll, it is possible to prevent the film from stretching or meandering due to the film being excessively stretched or slack, and to prevent the film from being connected poorly. .

[Brief description of the drawings]

FIG. 1 is a front view of an arrangement of a holder shaft and a guide roller of a film holding mechanism.

FIG. 2 is a plan view of FIG.

FIG. 3 is a front view of a pressure roller operating portion that operates a pressure roller provided at a film connecting portion and a brake means attached to an end of a holder shaft attached to the machine frame.

FIG. 4 is a plan view of a mounting portion of the brake means.

FIG. 5 is a side view of the mounting portion of the brake means.

FIG. 6 is a view taken along the line AA of FIG. 3;

FIG. 7 is a vertical sectional view of a moving pulley mechanism.

FIG. 8 is a plan view showing a guide rail section, a drive section, and a detection section of the movable pulley mechanism.

FIG. 9 is a front view of a moving pulley mechanism.

FIG. 10 is a rear view of FIG. 9;

FIG. 11 is a front view of the film cutting device.

FIG. 12 is a plan view of the film cutting device.

FIG. 13 is a side view of the film cutting device.

FIG. 14 is a sectional view of a film holding unit.

15 (a) and (b) are explanatory views for attaching a start end of a waiting film.

FIG. 16 is an arrangement diagram of a guide roller array of a film and a belt pulley array of a driving unit of the feeding mechanism on the packaging machine side.

FIG. 17 is a plan view of a feeding roller.

FIG. 18 is an arrangement front view of an electromagnetic clutch / brake and an operating gear mechanism interposed between a feeding roller and a moving pulley mechanism.

FIG. 19 is a plan view of FIG. 18;

FIG. 20 is a schematic diagram illustrating a film connection device.

FIG. 21 is a schematic explanatory diagram of the driving of the movable pulley.

FIG. 22 is an operation chart of the film connection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film connection device 2 Film roll holding mechanism 4a, 4b Holder shaft 18 Brake means 23 First encoder 30 Film connection portion 31a, 31b Crimping roller 45 Crimping roller operating portion 50a, 50b Electromagnetic solenoid 70 Film cutting device 90 Differential pulley mechanism 100, 101 Guide rail section 108,109 Moving pulley 110 Guide plate 112 Slide plate 116 Operating member 117 Operating groove (slide groove) 118 Tension pulley (fixed side pulley) 125 Drive unit 128 Drive shaft (winding transmission means) 131 Driven shaft (winding transmission means) ) 134 Drive chain (winding transmission means) 135 Driven chainwheel (winding transmission means) 136 Chain (winding transmission means) 138 Slide drive roller 140 Detecting unit 151 Registration mark sensor 160 Film feeding mechanism 162,163 Feeding roller 174 Second Encoder 178 Electromagnetic clutch / brake 185 Difference Gear mechanism 190 return for motor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65B 41/12 501 B65H 19/16 B65H 21/00-21/02

Claims (3)

(57) [Claims] An automatic connection device for a packaging film for connecting the end of a film being fed and the beginning of a standby film when the film continuously fed to the packaging machine is finished. Brake means and a first encoder are disposed on a pair of holder shafts that hold the film roll being fed and the standby film roll, and the first encoder transmits a pulse about the rotation amount of the holder shaft, The film feeding mechanism of the packaging machine is provided with a second encoder for transmitting a pulse about the film feeding amount, and the current diameter of the film roll being fed is obtained from a comparison of the number of pulses of the two encoders. Means for controlling the braking force of the film roll and the number of pulses from the first encoder and the second encoder. Is smaller than the reference size, a film end signal is transmitted, and the film feeding speed drawn out from the film roll being fed when the film is connected is reduced to a predetermined low speed. A control means for increasing the braking force is provided. In a film connecting portion for connecting the end side of the film being fed and the start end of the standby film, a pair of pressure rollers for sucking and holding the start end of the standby film. Is provided so that it can be connected to and detached from the film roll, and the film being fed is cut between the film roll and this film connection part in time with the film connection at the pressure roller operation part to terminate the film. The film feed path between this film connection and the film unwinding mechanism of the packaging machine is provided with a rotation from the film unwinding mechanism. A differential pulley mechanism composed of a moving pulley and a fixed side pulley, which is driven through a transmission mechanism and winds the film, is disposed, and a film is provided on the film feeding path between the film connecting portion and the moving pulley. A registration mark sensor for detecting the attached registration mark, wherein the differential pulley mechanism is configured such that when the moving pulley moves close to the fixed-side pulley, the film feeding speed at the film connection portion is reduced. From the deceleration to a predetermined low speed, and further, the speed is changed from the gentle acceleration to the original film feeding speed. Connects the film being fed and the film on the standby side, and when the moving pulley separates from the fixed side pulley, it returns to the initial position with the slowest slow movement. Automatic connection apparatus of the packaging film in the the packaging machine. 2. A rotational force transmitting mechanism interposed between the film feeding mechanism and a driving unit of a differential pulley mechanism includes:
An electromagnetic clutch / brake and a differential gear mechanism are provided. The electromagnetic clutch / brake receives a film end signal from the control means, turns off the brake, turns on the clutch, and turns on the clutch via the differential gear mechanism. The rotational force from the film feeding mechanism is transmitted to the driving unit of the differential pulley mechanism, and the electromagnetic clutch / brake receives a signal indicating that the moving pulley is positioned at the end of movement, turns off the clutch, and operates the brake. 2. The packaging film according to claim 1, wherein the moving pulley is returned from the moving end position to the initial origin position at a very low speed via the moving pulley returning motor connected to the differential gear mechanism at the same time as the ON operation of the film. Automatic connection device. 3. The differential pulley mechanism includes a pair of movable pulleys laterally mounted on a slide means, and a fixed pulley disposed at a moving end side of the movable pulley to wind a film and to move the film to a driving unit side. Is provided with a winding transmission means, and the winding transmission means is slidably connected to a slide groove vertically provided on the slide plate so that the movable pulley can reciprocate between an origin position and a movement end position. A slide driving roller is provided to reduce the film winding length in the forward movement process so that the film feeding speed at the film connecting portion can be reduced to a low speed, and the moving pulley reaches the moving end position. When,
2. The automatic connection device for a packaging film in a packaging machine according to claim 1, wherein a detecting means for detecting a return from the movement end position to the origin position is provided.