JP3346935B2 - Band operation roller unit of arch type packing 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 improvement in an arch type packing machine, and more particularly, to winding a band sent from a chamber through a roller unit to an arch type band guide around an object to be packed. The present invention relates to a novel feeding and pulling-back roller unit in a process of turning and holding the leading end of the band with an anvil and a light gripper, and then pulling back by a roller.

[0002]

2. Description of the Related Art A band feed control roller unit in a conventional arch type packing machine is disclosed, for example, in Japanese Patent Laid-Open No. 5-9711.
As described in Japanese Patent Application Laid-Open No. 5 (1993) -205, the operation of feeding and retracting the band to and from the band guide is performed by the driving roller 37 and the driven roller 38 (see FIGS. 8 and 9). In this case, the operation of the band is performed by a pair of rollers 3 as shown in FIG.
7, 38, so that the same drive rollers 37 are used.
, The control of the retraction speed and the speed at the time of the subsequent tightening operation are complicated, and it is difficult to perform high-speed feeding operation with high work efficiency, and the tightening torque at the time of tightening is insufficient. There were drawbacks.

In order to solve such a drawback, it is conceivable that the driving roller has a large diameter so that the band speed at the time of feeding and pulling back can be increased. The tightening force that can be applied to the band greatly differs depending on the position of the large-diameter roller where the driven roller 38, which presses against the roller and mainly applies the pull-back force to the band, is largely different. Is difficult to adjust. Further, at the time of starting the primary tightening operation to the secondary strong tightening operation, it takes time to decelerate the large-diameter roller having a large inertia, and it is inevitable that an impact force acts on the band. There is a disadvantage that the device for controlling the unit is complicated.

[0004]

SUMMARY OF THE INVENTION
To improve the shortcomings of the Ra unit,
An object of the present invention is to provide a roller unit capable of efficiently performing high-speed primary tightening and subsequent low-speed secondary strong tightening, and has the following objects. A first object of the present invention is to provide a roller unit which performs feeding of a band to a band guide at a high speed and realizes retraction of the band for primary tightening at a high speed and a low torque. . A second object of the present invention is to prevent the high-speed rotation of the return roller at the end of the high-speed retraction from giving a large frictional force to the band during the deceleration period of the return roller. Is to reduce the shock to the band due to deceleration.

The third object of the present invention is to reduce the primary
The purpose of the present invention is to prevent the band from being loosened during the transition to the next tightening. A fourth object of the present invention is to reduce the cost and power consumption of the control mechanism by simplifying the control mechanism of the roller unit. Another object of the present invention is to avoid excessive friction between the roller and the band from the end of the primary tightening to the start of the secondary tightening, to reduce the size of the roller driving device and to reduce power consumption. is there.

[0006]

To achieve the above object, an arch type packing machine according to the present invention comprises a roller unit having a pair of band feed rollers 37 and 38 and a one-way cluster.
A low-speed, high-torque return roller 39 driven through the switch 32; a high-speed, low-torque pull-back roller 40 provided at an upper portion of the return roller so as to be capable of coming and going; −
A secondary tightening return rocker roller 41 is provided at the lower part of the roller so as to be able to contact and separate therefrom, and the band is sent to a band guide in the arch by a pair of band feed rollers. After winding the band around the packaged object and holding the tip of the band with the anvil and the light gripper, high-speed pull-back is performed on the return roller, and the primary tightening is performed at high speed. After completion of the tightening, the pull-back roller is separated, and at the same time, a strong secondary tightening is performed by pressing the return rocker roller against the return roller.

[0007]

According to the above construction, the load according to the present invention is reduced.
The roller unit feeds the band to the band guide at a high speed by a pair of band feed rollers, winds the periphery of the article to be packed, and holds the end of the band with an anvil and a light gripper. Pull back to the upper part of the return roller.
By pressing it back at high speed to perform primary tightening, and furthermore, the return locker is located below the return roller.
A strong secondary tightening is performed by pressing the bearings, and a smooth transition from high-speed primary tightening to strong secondary tightening is performed. Then, the band is wound and bound around the article to be packed A by being melt-bonded with a seal unit.

[0008]

An embodiment according to the present invention will be described with reference to the drawings. FIG. 1 shows a main body 10 of the packing machine according to the present invention, which is roughly composed of a band supply unit 20, a roller unit 30, a seal unit 60, and an arch part 70.

The band supply unit 20 is a band reel 2
1, the band wound around the band reel 21 is guided by a guide roller 22, a guide 25, and a pair of rollers 23.
The sheet is fed to the roller unit 30 via the auxiliary feed unit and the guide 24 which are configured . Further, the band supply unit 20 includes a chamber 29 below the packing machine main body 10. The chamber 29 has a role of temporarily storing the band sent to the binding unit at a high speed for packing so that the band is smoothly fed and a retracted portion of the band when the band is tightened is retracted and stored. .

The chamber 29 has a band accumulation sensor 2
The band 6 is provided to detect the amount of accumulation by the position of the band accumulation sensor 26 so as to always accumulate a fixed amount of bands in the chamber 29, and control the feeding from the band reel 21 to the chamber.

As shown in FIG. 3, the roller unit includes a series of a pair of feed rollers 37 and 38, a high-speed return roller 40, and a tension roller 42 by a belt 35 wound around a large-diameter pulley 33 of the motor 31. A roller group and a return roller 39 which is separately driven by the motor 31 via a speed reducer 81 and a one-way clutch 32
And a rocker roller 41 for secondary tightening for strongly tightening the band facing the return roller.

The seal unit 60 is a device for fixing the tip of the band wound around the article to be packed A and fixing and cutting the tightened band by heat welding or the like. Gripper 62,
It comprises a seal portion 63 and the like, an operation cam 65 and a cam shaft 64 for controlling these, a cam shaft drive pulley 66 and the like.

Below the anvil 68, a compression head 61 and left and right grippers 62, 63 are provided with a plurality of cams 6.
By moving up and down by 5, operations such as fixing of the band, fastening of the article to be packed, and welding are performed. A roller timing cam can be attached to the cam shaft 64 as described above. Reference numeral 66 denotes a pulley provided on the camshaft 64, which is belt-mounted on a pulley of a camshaft driving output shaft of the speed reducer 81 shown in FIG.

Here, the roller unit 30, which is a main component of the present invention, will be described. The return roller 39 is a reduction mechanism in which the driving force is transmitted from another small diameter pulley 34 of the motor 31 via a belt. It is desirable to use 81 to apply a driving force via a one-way clutch provided on the output shaft of the speed reducer. One embodiment of the main structure of the present invention, as is apparent from FIG. 3, is that a high-speed pull-back roller 40 is located at an upper position, in contrast to a return roller 39 which can be rotated in one direction by a one-way clutch. At the contact point between the guide G and the return roller 39. On the other hand, Rockaro-La 4 for secondary tightening
Reference numeral 1 denotes a lower portion of the return roller 39, which is desirably provided, for example, at a position 90 to 120 degrees clockwise from a position where the high-speed pull-back roller is pressed against the return roller.

The thus constructed roller unit 30
The relationship between the respective roller portions and the transfer state of the band B in the above is as follows. That is, in the initial stage of winding the band around the article to be packed A, a pair of feed rollers 37 and 38 are provided.
As a result, the tip of the band sent at high speed from the chamber 29 passes over the guide G, passes through the groove of the band guide 71 in the arc, and is wound around the article A to be packed, thereby forming the seal unit 60.
Are reached. At this time, a pair of feed rollers 37 and 38 are fixed at the same time as the tip of the band is fixed.
Are separated and the high-speed pull-back roller 40 is
It is pressed against the surface of the roller 39. In this case, what is important is that the return roller is always rotated clockwise on the paper of FIG. 3 at a low speed via the one-way clutch by the drive shaft from the speed reducer 81.

Subsequently, when the high-speed pull-back roller 40 is pressed against the return roller 39, the return roller 3 is pressed.
9 is mounted on the drive shaft via a one-way clutch (not shown), so that it can be freely accelerated to the speed of the high-speed pull-back roller 40 and pull back the band, thereby enabling quick primary tightening. . In this way, when the band B is pulled back and wound around the article A to be packed, the high-speed pull-back roller 40 is returned to the return roller 39.
At the same time, the rocker roller 41 for secondary fastening is pressed against the lower part of the return roller. As a result, the band is strongly applied with the secondary tightening force by sandwiching the return roller with the original low-speed and high-torque return roller and the rock-roller.

At this time, the high-speed pull-back roller in which the rock roller is installed near the contact point between the band and the return roller.
Since the band is located at about 90 to 120 degrees from the pressure contact position of the roller, the band is tightened while being wound about one quarter or more of the return roller, and the low-speed, high-torque -A very large frictional force between the roller 39 and the band can be obtained.

The high-speed retraction roller 40 is provided with a
Since it is installed in the upper part near the contact point between the roller and the band, the friction between the band and the return roller at the end of the high-speed rotation for the primary fastening is small, and the return
The inertia of the rollers does not adversely affect the band.

As another embodiment, a high-speed pull-back roller 4
The connection to the zero drive shaft can be made using an electromagnetic clutch. In this case, at the time of the primary tightening high-speed retraction, the high-speed retraction roller 40 is pressed against the return roller 39 with the electromagnetic clutch in the ON state. The primary tightening can be used by rotating the roller clockwise at high speed and pulling back the band at high speed.
While the electromagnetic clutch is turned off, the high-speed retraction roller continues to be pressed against the return roller. At the same time, when the rock roller 41 is pressed against the return roller 39, the band is subjected to strong secondary tightening with the rotation of the return roller 39 at low speed and high torque.

Also at this time, the high-speed pull-back roller maintains the state of being pressed against the return roller, and is freely rotated in accordance with the low-speed rotation of the return roller. -The guide can be guided without being separated from the roller, and the rotation of the return roller is not adversely affected at all.

Further, as another embodiment, in which a high-speed pull-back roller 40 and a band feed roller 37 are driven by a single belt 35, a pull-back roller 40 and a band feed rock roller 38 are used. The driving lever 53 and the rocking plate 46 to be supported can be rocked synchronously by a roller timing cam 56 provided on the seal shaft 64.

This mechanism is clearly shown in FIGS. In FIG. 4, a high-speed pull-back roller 40 that can contact and separate from the return roller 39 is supported on the roller driving lever 53, and the driving lever 53 swings about the fulcrum 52 as indicated by an arrow F. On the other hand, a rocker roller 38 of a pair of band feed rollers is fixed by a pin 47 fixed to a rocking plate 48.
It is supported by a drive lever 46 that is moved . And
The swing plate 48 connected to the drive lever 53 and the drive lever 46 is mutually connected to a swing transmission member 50 via hooks 51, 51.

The swing transmission member 50 has an intermediate portion supported by a swing arm 54, and the swing transmission member 50 has
Is engaged with a roller timing cam 56 mounted on a cam shaft 64 via a roller. Therefore, when the roller timing cam 56 rotates, the swing transmission member 50 moves up and down via the swing arm 54, and in synchronization with this, the high-speed pull-back roller to the return roller 39. -La 4
The pressure contact of 0, the separation of the rock roller 38 from the roller 37, and the reverse operation are repeated. As described above, the two pairs of rollers can be easily moved in and out of synchronization only by rotating the cam.

FIG. 6 schematically shows the seal unit. Below the anvil 68 is the compression head 6
When the gripper 1 and the left and right grippers 62 and 63 are moved up and down by the plurality of cams 65, operations such as fixing the band, tightening the packaged object, and welding the band are performed. The roller timing cam 56 can be attached to the cam shaft 64 as described above. Reference numeral 66 denotes a pulley provided on the camshaft 64, which is belt-mounted on a pulley of a camshaft driving output shaft of the speed reducer 81 shown in FIG.

[0025]

The first effect of the present invention is that the high-speed pull-back roller is disposed above the return roller, so that the band is deeply wound around the return roller at the time of high-speed pull-back and immediately thereafter. This is to prevent generation of unnecessary frictional force. Therefore, after the high-speed retraction is completed, the return roller that has been rotating at a high speed does not further apply an impact tensile force to the band that has been retracted due to its inertia.

The second effect of the present invention is that the return rocker roller is provided below the return roller separately from the high-speed pull-back roller, so that the band to the return roller is formed. The winding angle is large, and a sufficient tightening force can be obtained at the time of secondary tightening.

The third effect of the present invention is that the high-speed pull-back roller is driven via an electromagnetic clutch.
The pressing of the high-speed retraction roller to the return roller can be continued until the secondary tightening, so that the band can be prevented from being loosened during the transition from the primary tightening to the secondary tightening. Further, in order to prevent the band from being loosened, energy loss due to continuation of pressure contact of the high-speed pull-back roller with the band slipping can be avoided as in the related art, and the motor becomes large and power is wasted. Can be prevented.

Another advantage of the present invention is that when a high-speed pull-back roller and a band-feeding rock roller are driven by a single belt, the pressure contact and separation of each roller is controlled by one cam. Since this can be performed by the swing transmission member, the mechanism is simple, and an individual pressure contact control solenoid or the like is not required, so that cost can be reduced and power consumption can be reduced.

[0029]

[Brief description of the drawings]

FIG. 1 is a schematic front view of a packing machine of the present invention.

FIG. 2 is a plan view of the packing machine shown in FIG.

FIG. 3 is an enlarged front view of a roller unit of the packing machine shown in FIG.

FIG. 4 is an enlarged front view of one embodiment of a mechanism for alternately and synchronously driving a feed rocker roller and a high-speed retraction roller of the roller unit shown in FIG. 3;

5 is a schematic front view of the synchronous drive mechanism shown in FIG. 4 and a cam for controlling the same.

FIG. 6 is a plan view of a drive mechanism in the packing machine of the present invention shown in FIG.

FIG. 7 is a front view of a seal unit of the packing machine shown in FIG. 1;

FIG. 8 is a schematic diagram showing a band feed roller and a band feed controller in a conventional example.

FIG. 9 is a schematic diagram showing band feeding and pulling back operations in a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 packing machine body 20 band supply unit 30 roller unit 31 motor 37 feed roller 38 feed rocker roller 39 return roller 40 high-speed retraction roller 41 return rocker roller 54 swing arm 60 seal unit 64 camshaft 70 arch part 71 band guide 81 drive reduction gear

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65B 13/22 B65B 13/06 B65B 13/18

Claims (3)

(57) [Claims] 1. In a band operation roller unit of an arch type packing machine, the roller unit is driven via a pair of band feed rollers 37 and 38 and a one-way clutch 32.
A low-speed, high-torque return roller 39 to be driven; a high-speed, low-torque pull-back roller 40 provided at an upper portion of the return roller so as to be capable of coming and going; and a lower portion of the return roller. Return rocker ro for secondary tightening provided detachably on the part
The band is wound around the article to be packed by feeding the band to the band guide in the arc with a pair of band feed rollers, and the band tip is held by the anvil and the light gripper. The primary tightening is performed at high speed by pressing the return roller against the return roller, and after the primary tightening is completed, the return roller is separated from the return roller, and at the same time, the return rocker is attached to the return roller.
A band-operated roller unit for an arch-type packing machine, wherein a strong secondary tightening is performed by pressing a roller. 2. In a band operation roller unit of an arch type packing machine, the roller unit is driven by a pair of band feed rollers 37 and 38 via a one-way clutch 32.
A low-speed, high-torque return roller 39 to be driven; a high-speed, low-torque pull-back roller 40 provided at an upper portion of the return roller so as to be capable of coming and going; and a lower portion of the return roller. Return rocker ro for secondary tightening provided detachably on the part
The pull-back roller 40 communicates with the drive motor via an electromagnetic clutch, and sends a band to a band guide in the arc by a pair of band feed rollers to be packed. After winding the band around the object and fixing the tip of the band, a high-speed and low-torque pull-back roller is pressed against the return roller to perform primary tightening.
After the primary tightening is completed, the electromagnetic clutch is released while the return roller 40 continues to be pressed against the return roller, and the return rocker roller is pressed against the return roller to provide a strong secondary. A band operation roller unit for an arch type packing machine, wherein a tightening operation is performed. 3. The high-speed and low-torque pull-back roller 40 and the band feed roller 37 are driven by the same belt, and the pull-back roller 40 and the band feed rock roller 38 are provided with levers 46 and 53, respectively. The lever according to claim 1 or 2, wherein each lever is swingably supported by a single cam (56) attached to a seal cam shaft. -La unit.