JPH0210005B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a band supply and tightening device for a packaging machine.

[Prior art and problems]

Conventionally, in this type of device, band supply and tightening were
A method was adopted in which a pair of press-contact rollers were rotated in forward and reverse directions using separate drive sources, but this resulted in a complicated configuration and the size of the machine. Therefore, a system was proposed that uses the same drive source and performs forward and reverse rotations, but the load on the motor due to forward and reverse rotations was large, and it required at least two clutches for forward and reverse rotation, and to adjust the rotation timing of the camshaft. It requires a brake, making the structure complicated and expensive, and since the single-phase 100V motor has no phase, it requires phase conversion, which has the disadvantage of slowing down the start-up of the motor. was. In addition, the band is tightened by a primary tightening process in which the supplied band is pulled back, and a secondary tightening process in which the pulled-back band is tied to the packaged item, but these processes involve fixing the tip of the band. After that, the roller is reversely rotated at a high speed to wrap the packaged object, which is the primary tightening process, and then the secondary tightening process is performed by using the cam and tension arm disclosed in Japanese Utility Model Publication No. 52-24233, for example. Ta. In this method, there is a natural limit to the rotation stroke of the tension arm, and it is difficult to bind elastic materials such as futons and blankets within the rotation stroke of the tension arm. Therefore, there is currently provided a device in which a touch roller is provided that has a single driving source for the delivery roller and the tightening roller and can move toward and away from each other in each direction. The latest version of this system is one in which two touch rollers are fed out in a seesaw manner and can freely approach and separate from the tightening roller (Japanese Patent Publication No. 52-11918). In this mechanism, the touch roller is provided so as to be in pressure contact with and separate from the delivery roller, but it is merely driven by the driving delivery roller, so the low speed and high torque during secondary tightening is not achieved automatically. Since the frictional contact between the band surface and both rollers is the limit, the band may slip and large tightening force cannot be obtained. Since the intermediate support shaft is disposed at the center, the structure of this part becomes complicated, and maintenance problems such as the extremely difficult adjustment of the pressure contact force of the touch roller arise. Furthermore, in addition to the motor for forward and reverse rotation of the roller, another motor for rotating the camshaft for bonding the band, etc., is indispensable. In addition, in order to obtain high torque during the secondary tightening, it is necessary to reduce the rotational speed of the rollers, which increases the time for one packing process, or requires the use of planetary gears. In order to obtain the above-mentioned high torque, a complicated differential reduction mechanism such as This method had the disadvantage that it was not carried out on a regular basis.

【composition】

An object of the present invention is to provide a band supplying and tightening device that can quickly transition to secondary tightening and perform compact, strong, and quick band tightening with an extremely simple structure. Two gears having a large diameter 22 and a small diameter 23 are wedge-supported on an input shaft 20 connected to a drive source that constantly rotates in one direction, and the above-mentioned A small diameter gear 33 and a large diameter gear 34 are respectively provided on the output shaft 30 arranged in parallel with the input shaft, and the small diameter gear and the large diameter gear of the output shaft are clamped by a one-way clutch on the output shaft and by a clutch plate 37. The output shaft of the drive system is rotatably supported on a shaft and connected to one drive shaft 80 of the feed roller section consisting of a band supplying and tightening roller through a transmission member such as a belt or chain, and the band supplying and tightening roller is connected to the drive shaft 80 of the feed roller section. The rollers 72 to 75 are a pair of normal rotating rollers 7.
2, a normal rotation touch roller 73 that can freely come into contact with and separate from the normal rotation roller, and a pair of reverse rotation rollers 74 and a reverse rotation touch roller 75 that can freely come into contact with and separate from the said reverse rotation roller, and are arranged facing each other. Touch roller 73 and reverse touch roller 75
are respectively supported on eccentric shafts protruding from the eccentric positions of the driven shafts, and each of the eccentric shafts is configured to be rotatable, and a gear 76 is attached to each roller so that each pair of rollers is driven to rotate in opposite directions. , 87, 77, and 88 are provided to interlock with each other.

[Effect]

Therefore, one drive shaft of the feed roller unit, which is connected to the constantly rotating drive system via a transmission member such as a belt or chain, rotates, and the forward and reverse rollers move in opposite directions due to the meshing motion of the gears. Rotate. Further, the forward rotation roller and the forward rotation touch roller, and the reverse rotation roller and the reverse rotation touch roller are also rotated in opposite directions by the meshing motion of the gears. Then, the normal rotation touch roller is pressed against the normal rotation roller, and the band is supplied by both rollers that are driven to rotate together.The reverse rotation touch roller is also pressed against the reverse rotation roller, and the band is pulled back between both rollers. , tightened. That is, when the band is pulled back with no load applied to the reversing roller, the small diameter gear 3 of the output shaft 30 of the drive system
3 rotates at a higher speed than the large-diameter gear 34, the one-way clutch does not act, and the high-speed rotation of the small-diameter gear is transmitted to the reversing roller via a transmission member such as a belt or chain. is wound around and a load is applied to the reversing roller, the rotation of the output shaft 30 decreases and the small diameter gear 33
When the rotational speed of the large-diameter gear 34 becomes the same as that of the large-diameter gear 34, the one-way clutch acts and the rotation of the large-diameter gear 34 is transmitted to the output shaft, and the low-speed, high-torque rotation of the output shaft of this drive system is transferred to the belt or The power is transmitted to one drive shaft through a transmission member such as a chain, and the reversing roller rotates at low and high speed torque, strongly tightening the band. Furthermore, since the gears of the reversing roller and the reversing touch roller are engaged in meshing motion, the reversing touch roller does not simply rotate following the movement of the band that is tightened by pressing against the reversing roller through the band; The same rotational force of the touch roller and reversing roller is applied to both sides of the band, and in order to prevent slippage between the roller and the band surface, the band is Tighten strongly.

【Example】

The details of the present invention will be explained below based on the illustrated embodiments. In FIG. 1, 1 is an outer plate forming the packaging machine body, 2 is a machine stand, and 3 is a machine frame. A motor 4 is mounted on the machine base 2, and a reducer 6 is fixedly installed on the machine frame 3 and connected to the motor 4 via a belt 5. A pulley 21 provided at the end of the input shaft of the drive system 10 on the stand 2 is connected. A sprocket is wedged at the end of the output shaft of the drive system 10, and connected via a chain 82 to a sprocket 81 at the end of the drive shaft 80 of the feed roller section 70. Sho 11
1 is a clutch provided on the input shaft of the reducer 6, and 50 is a detection mechanism for the completion of secondary tightening. Next, the details of the drive system 10 will be described in detail. As shown in FIG. It is fixed with clothes etc. On the other hand, an output shaft 30 parallel to the input shaft 20
A sprocket 31 is provided at the end of the shaft, and a small-diameter gear 33 is engaged with the large-diameter gear 22 on the input shaft 20 via a bearing 32 to be rotatably supported. Also, adjacent to the small diameter gear 33, a large diameter gear 34 is provided which meshes with the small diameter gear 23 of the input shaft. The large-diameter gear 34 has a bearing 35 interposed on its inner diameter surface, and is supported on the protrusion 33' of the small-diameter gear 33. The large-diameter gear 34 is supported by a clutch plate 37 of a clutch wheel 38 wedged to the output shaft 30 via a bearing 36, while the large-diameter gear 34 is fixed to a clutch wheel 40 built into a one-way clutch mechanism 39 that interlocks with the output shaft 30. The installed clutch plate 41
The clutch plate 41 is pressed against the side surface of the large-diameter gear 34 by a spring 43 whose one end is in contact with the adjustment screw 42, so as to sandwich both gears 33 and 34. Note that 26 is wedged between the surface plate 25 and both shafts 20 and 30 by a bearing. Note that 51 is a flywheel of the secondary tightening completion detection mechanism 50. That is, as shown in FIG. 3, a flywheel 51 is provided which is in sliding contact with the outer peripheral edge of the clutch wheel 40 and can freely roll.
The flywheel 51 is supported on the tip of a shaft plate 53 having a weight 52 at its rear end, and a shaft 55 is supported on the upper end of a rotary plate 54 at the middle of the shaft plate 53.
The lower end of the rotary plate 54 is configured so that a limit switch 56 can be freely operated, and the middle of the rotary plate 54 is supported on a support plate 57 so that the support plate 57 can be rotatably supported. On the other hand, FIGS. 4 to 6 show the feed roller section 7.
0, 71 is a band shooter, and facing this band shooter 71, a forward rotation roller 72 and a reverse rotation roller 74 are arranged at a predetermined interval. A sprocket 81 provided therein is connected to the sprocket 31 of the input shaft 30 via a gear 82'.
Further, a gear 82' is provided on the sprocket 81 side of the drive shaft 80, and the gear 82' and the reversing roller 74 are connected to each other.
A gear 84 provided on a shaft 83 is meshed with each other so that both rollers rotate in opposite directions. In the illustrated embodiment, the gear 84 of the reversing roller has a large diameter in order to obtain high torque at low speed during tightening. Reference numerals 73 and 75 indicate positive and reverse touch rollers, which are supported on eccentric shafts 85 and 86 protruding from the eccentric positions of the driven shafts 115 and 116, respectively, and
86 are configured to be rotatable, and gears 87 and 88 are provided integrally with the rollers 73 and 75. These gears 87 and 88 mesh with gears 76 and 77 that are integrally provided on the roller sides of the forward and reverse rotation rollers 72 and 74.
That is, the gear 76 of the normal rotation roller 72 and the gear 87 of the normal rotation touch roller 73 are meshed, and the gear 77 of the reverse rotation roller 74 and the gear 88 of the reverse rotation touch roller 75 are meshed, and two sets of normal rotation and reverse rotation are respectively formed. Configure the rollers. Therefore, it goes without saying that the pair of gears 76 and 87 and 77 and 88 have the same diameter. The upper ends of operating rods 90, 95 are rotatably attached to the tips of the eccentric shafts 85, 86 of the forward and reverse touch rollers 73, 75, and the operating rods 90, 9
5 is loosely fitted into a hole 92 provided in a bent piece of the L-shaped interlocking rods 91 and 96, and connected to the interlocking rod 91 via a spring 93. The lower end of the interlocking rod 91 is attached to the tips of arm rods 98 and 99 having trochanters 94 and 97. One end of the arm rods 98, 99 is rotatably supported on a shaft 100 protruding from the machine base 2, and a spring 101 is engaged with the other end to urge the arm rods 98 and 99 toward the band shooter 71. Reference numerals 102 and 103 are attached to a shaft extending from a cam shaft 104 for operating a band gripper 105 (known as a cam), a heater (not shown), a center press, etc., and the trochanter 9 of the arm rods 98, 99
4 and 97 to operate in conjunction with the interlocking rods 91 and 96, and hence the operating rods 90 and 95. The camshaft 104 is rotationally driven by a reduction gear 6 that is interlocked with the motor 4 . This motor can be used in combination with a motor that is linked to a pulley provided on the drive shaft of the normal rotation roller. If the bearings of the forward and reverse touch rollers 73 and 75 are of a self-aligning type, the rollers 7 will move when the operating rod 90 is pulled down.
3,75 are tilting while the forward and reverse rollers 72,
74 can be prevented from being pressed. In the figure, 108 is a slide table, 107 is a limit switch, 106 is a band guide, 109
indicates a guide roller. The embodiment of the present invention has the above configuration, and its operation will be explained next. In FIGS. 1 to 6, the motor 4 is always rotating in a fixed direction. This rotation is transmitted to the input pulley 21 via the V-belt 7, and the input shaft 20 is constantly rotated. Therefore, the large diameter gear 2 on the input shaft 20
2 and the small diameter gear 23 are also constantly rotating. Also, both large and small gears 3 on the output shaft 30 that mesh with this
3 and 34 also rotate. Now, since the small-diameter gear 33 on the output shaft 30 rotates at a higher speed than the large-diameter gear 34, the one-way clutch 39 does not work, and therefore the rotation of the small-diameter gear 33 is caused by the clutch plate 37,
The rotation of the output shaft 30 is transmitted to the output shaft 30 via the clutch wheels 38 and 40, and the rotation of the output shaft 30 is transmitted to the sprocket 31 at the end of the output shaft 30 and the chain 82.
It is transmitted to the sprocket 81 of the feed roller section 70 connected to the sprocket 81 via the feed roller section 70. Therefore, the gear 8 on the shaft 80 of the normal rotation roller 72
2', a normal rotation roller 72 and a gear 76 integrated with this roller are rotated counterclockwise in FIG. By the gear 84 meshing with the gear 82',
The reversing roller 74 rotates clockwise in the figure,
and gears 7 of forward and reverse rotation rollers 72 and 74;
Due to the touch roller gears 87 and 88 that are slightly meshed with the touch rollers 6 and 77, the forward and reverse touch rollers 73 and 75 are constantly rotating in their respective operating directions. However, since the convex part of the cam 102 is not in a position to press down the trochanter 94 between the forward rotation roller 72 and the forward rotation touch roller 73, there is a gap that exceeds the thickness of at least one band. The band within the shooter 71 is not affected. Reverse roller 74 and reverse touch roller 7
The relationship in 5 is similar. Now, by actuation of a start switch (not shown), by the tip of the band pushing the limit switch 107 provided at the end of the band guide 106, or by a signal from a timer, the clutch 111 is engaged, the camshaft 104 rotates, and the band gripper 105 is raised. and grasp the tip of the band. At the same time cam 10
3 is also rotating, the operating rod 95 is pushed down via the trochanter 97, the arm rod 99, and the interlocking rod 96, and the eccentric shaft 86 rotates in an arc, and the reverse touch, which is supported by the eccentric shaft 86, is rotated. The roller 75 is pushed down and comes into pressure contact with the reversing roller 74. At this time, gears 77 and 88 are completely meshed. Therefore, the band supply end side in the band shooter 71 is pulled back at high speed by a pair of rotationally driven rollers (primary tightening). The pair of rollers 74 and 75 further tighten the band and try to bind the object to be packed, but the torque applied to the band wound around the object to be packed is applied to the output shaft of the drive system via the sprocket 81 and the chain 82. Since the output shaft 30 reaches the sprocket 31 at the end of the shaft 30, the rotation of the output shaft 30 decreases. That is, the small-diameter gear 33 on the output shaft 30 is about to rotate at high speed, but its rotational speed is reduced by the aforementioned primary tightening torque. Furthermore, when the rotational speed of this small diameter gear decreases, the large diameter gear 34 finally
The rotation speed becomes the same as that of the one-way clutch 3.
9 acts, the low speed, high torque rotation of the large diameter gear 34 is transmitted to the output shaft 30, and reaches the feed roller section 70 via the sprocket 31 and the chain 82, and the sprocket 81 is connected to the sprocket 31. Since the diameter is larger, the pair of reversing rollers 74 and reversing touch rollers 75 rotate at a lower speed and higher torque to tighten the band even more strongly. At this time, since the gear 77 of the reversing roller 74 and the gear 88 of the reversing touch roller 75 are engaged in meshing motion, the reversing touch roller 75 simply follows the movement of the band that is pressed against the reversing roller 74 via the band and tightened. Instead of rotating with
The same rotational force of the reversing touch roller 75 and the reversing roller 74 acts on both sides of the band, and in order to prevent slipping between the rollers and the band, the reversing roller 74 and the reversing touch roller 75 rotate at low speed and high torque. The force tightens the band tightly. When the band is fully tightened against the object to be packed, the band pulling completion detection mechanism shown in FIG. 3 is activated. That is, the torque for tightening the band is transmitted to the clutch wheel 40 on the output shaft 30 via the gear 82', sprocket 81, and gear 82' on the shaft 80 that mesh with the gear 84 of the reversing roller 74 in the feed roller section. There is. Therefore, since the output shaft 30 attempts to stop at the above-mentioned tightening torque, the clutch plate 41 will slip against the large diameter gear 34. On the other hand, the flywheel 51 rolling on the clutch wheel 40 rolls upward in FIG. 3 due to inertia as the rotation of the clutch wheel decreases, so the shaft plate 53 also rotates upward in the figure. Therefore, the rotary plate 54 rotates to the left, and the lower end of the rotary plate 54 releases the pressure on the limit switch 56, which is the B contact, and the clutch 111 of the reducer 6 turns on.
Then, the camshaft 104 rotates and, at the same time as the known band supply mechanism is gripped, the rotation of the camshaft 104 releases the pressure contact of the reversing roller 74 and the reversing touch roller 75 to the band, returning to the previous position, and furthermore, the known band supply mechanism is gripped. The steps of band cutting and welding are completed.
On the other hand, since the rotation of the camshaft 104 rotates the cam 102, the normal rotation roller 72 and the normal rotation touch roller 73 are in the state shown in FIG. Deliver to the top. In this embodiment, the amount of band supply can also be determined by the length of the convex portion of the cam 102. When the band supply is completed by the rotation of the cam 102, a limit cam (not shown) that interlocks with the camshaft 104 operates, and the reduction gear 6 is transferred to the camshaft 104.
Clutch 1 that interlocks the rotation of motor 4 via
1 is turned OFF, the rotation of the camshaft 104 is stopped, and each mechanism returns to its previous position. In order to accurately stop (and start) this rotation, an electromagnetic brake may be provided on the input shaft of the reducer.

【effect】

Since the present invention is constructed as described above, it is possible to obtain an infinite tightening width without using a tension arm or any special operation deceleration mechanism, and it can also be used for forward and reverse rotations with a single drive source. By disposing gears on each pair of rollers, all rollers can be rotated during forward and reverse rotation without the need for a clutch, making it possible to tighten the band particularly strongly and reliably. Since the feed roller section is connected to the drive system via a transmission member, the feed roller section can be configured compactly, and the forward and reverse touch rollers are each eccentrically supported to reduce the turning radius when pressing on and releasing the touch rollers. In addition to being effective, it can be constructed compactly, and the feed roller section can be placed closer to the side of the main body, so it can be applied to a semi-automatic packaging machine for improved usability.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is an overall schematic diagram, Fig. 2 is a partial sectional view, Fig. 3 is a schematic diagram showing a secondary tightening completion detection mechanism, and Fig. 4 is a feed roller. FIG. 5 is a plan view of the feed roller section, and FIG. 6 is a partial sectional view. 4... Motor, 10... Drive system, 20... Input shaft, 22... Large diameter gear, 23... Small diameter gear, 3
0... Output shaft, 31... Sprocket, 33...
Small diameter gear, 34...Large diameter gear, 39...One-way clutch mechanism, 50...Secondary tightening completion detection mechanism, 70...Feed roller section, 72...Tip roller, 74...Reverse rotation roller, 73... Forward rotating touch roller, 75...Reverse rotating touch roller,
85, 86... Eccentric shaft.

Claims (1)

[Claims] 1. Two gears of a large diameter and a small diameter are each wedge-supported on an input shaft connected to a drive source that constantly rotates in one direction, and the input shaft is arranged so as to mesh with the large diameter gear and the small diameter gear of the input shaft. A small-diameter gear and a large-diameter gear are provided on output shafts arranged in parallel with each other, and the small-diameter gear and large-diameter gear are rotatably supported via a one-way clutch on the output shaft and clamped by a clutch plate. A drive system is configured, and the output shaft of the drive system is connected to one drive shaft of a feed roller section consisting of a band supply and tightening roller via a transmission member such as a belt or chain, and the band supply, The tightening rollers include a pair of normal rotating rollers and a normal rotating touch roller that can freely come into contact with and separate from the normal rotating roller, and a pair of normal rotating rollers and a reverse rotating touch roller that can freely come into contact with and separate from the reverse rotating roller. Further, the normal rotation touch roller and the reverse rotation touch roller are each supported on an eccentric shaft protruding from a driven shaft at an eccentric position, and each of the eccentric shafts is configured to be rotatable, and each pair of these rollers is A band supplying and tightening device for a packaging machine, characterized in that each roller is provided with gears and interlocked with each other so that the rollers rotate in opposite directions.