JPS5839694B2 - Band tightening device in packing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a band tightening device for a packaging machine.

Conventionally, this type of band tightening device fixes the tip of a band that has been fed out a certain amount by, for example, a pair of rollers, then rotates the rollers in the reverse direction at high speed, wraps it around the object to be packed, and then tightens it even more. Jitsukō 52-242
The rotational stroke of the cam and tension arm disclosed in No. 33 has its own limitations, and for example, it is difficult to bind elastic materials such as futon cotton and blankets.

In the present invention, after the band is pulled back at high speed (primary tightening),
It is an object of the present invention to provide a packing machine that performs secondary tightening for binding objects to be packed using a gear reduction device and is equipped with a tightening sensing mechanism using torque.

The present invention will be described in detail below based on the illustrated embodiment. As shown in FIG. 1, M rotates an input shaft 200 angstrom force pulley 21 via a V-belt 10 using a motor.

Further, a sprocket 31 is provided at the end of another output shaft 30 arranged in parallel with the input shaft 20, and this sprocket 31 is interlocked with a sprocket 13 provided on the shaft of the main roller 12 via a chain 11.

A feed roller 14 is rotatably provided below the main roller 12 and is biased upward by a spring or the like and is in pressure contact with the main roller 12.

This is because wrapping the band B around the rollers 12 and 14 in an S-shape increases the frictional resistance.

Further, as shown in FIG. 2, on the input shaft 20 of the input pulley 21, an interlocking pulley 23 that interlocks with a forward rotation clutch 22 is connected to a large diameter gear 25 and a small diameter gear 26 via a reverse rotation clutch 24. bearing each.

On the other hand, output shafts 30 and 30 installed in parallel with the input shaft 20
'J:, an interlocking pulley 32 is provided adjacent to the sprocket 31 at a position corresponding to the interlocking pulley 23 of the input shaft 20, and connected by a V belt 33.

A gear 35 having a smaller diameter than the gear 25 is held between the rising wall 36' of the slip plate 35 and the slip plate 50 so as to mesh with the gear 25 via the reverse clutch 34, and the shaft 30'
In addition, a secondary tightening completion sensing mechanism 40, which will be described later, is provided, and a mechanism larger than the small-diameter gear 26 on the input shaft 20, which is sandwiched between the slip plates 37 and 37 and meshes with the small-diameter gear 26 on the input shaft 20, is provided. A one-way clutch mechanism is constructed in which a diameter gear 38 is supported on a shaft 30' and biased toward the sysprokerato 31 by a spring 49 whose one end is locked to a secondary tightening adjustment screw 51.

Note that 52 is a bearing, 53 is a bearing, and 54 is a primary adjustment screw.

The above-mentioned secondary tightening completion sensing mechanism 40 is the slip plate 3.
The shaft 4 of the flywheel 41 slides and rotates on the circumference of 7'.
2 is provided on a ring 43, and this ring 43 is connected to a wheel 45 supported by a shaft 30' through a pin 44, and an arm 46 is provided on the circumference of the wheel 45 opposite to the pin 44. The tip is provided so that the limit switch 47 is housed in a freely pushable position.

Reference numeral 48 denotes a weight, which is fixed to the wheel 45 in order to maintain the weight balance of the -y-y wheel 41.

Note that other design changes may be made as desired depending on the implementation, such as making the output shafts 30 and 30' integral and omitting the clutch 34.

The present invention has the above structure, and its operation will be explained next. In FIG. 1, the motor M always rotates in a fixed direction.

This rotation is transmitted to the input pulley 21 via the V-belt 10, and the input shaft 20 constantly rotates.

When a band is supplied from a band reel (not shown) (at the time of normal rotation), the input pulley 21 starts rotating downward from the back side of the paper in FIG. The pulleys 23 and 32 are rotated in the same direction by the V-belt 33, and the sprocket 31 is rotated in the same direction as the input pulley 21.

This rotation rotates the prokerato 13, which is pivoted on the main roller in FIG. A fixed amount is supplied using an invisible timer, etc.

When the tip of the band is fixed by a known mechanism, the reverse clutches 24 and 34 are turned on, and the two sets of gears 25 and 35 and 26 and 38 on the input shaft 20 and output shaft 30'
These two sets of gears have different numbers of teeth, so when the main roller 12 is not loaded with the band 9 (primary tightening), the gear 35 is connected to the gear 38 via the one-way clutch 55. rotates faster than.

In response to this rotation, the sprocket 31.13 of the output shaft 30, the main roller 12, and the feed roller 14 rotate at high speed in the direction of the arrow in FIG. 1, respectively, via the clutch 34.
Band B is pulled back and wound around the object to be packed (-next tightening).

Next, since a load is applied to the main roller 12, the gear 3
5 is the rising wall 36 of the slip plate 36 and the slip plate 50
In contrast, the sliding gear 35 idles.

At this time, the rotation of the gear 38, which was rotating slower than the gear 35, corresponds to the rotation of the output shaft 30', and this time, the slow rotation of the gear 38 causes the output shaft 30' to rotate, resulting in so-called secondary tightening.

When the band B is tightly bound to the item to be packed by the slow rotation of the main roller 12, the load on the main roller 12 increases, and therefore the slip plate 37.3 that presses the gear 39
7' begins to slide and the output shaft 30' is a slip plate 37.37'
The rotation will stop with the

At this time, the flywheel 41, which slides and rotates on the outer periphery of the slip plate 37', rotates upward from the front of the paper in FIG. In order to move, the arm 46, one end of which is fixed to a wheel 45 connected to the flywheel 41 through a ring 43, is similarly lowered toward the rear of the plane of the figure, and the limit switch 47 is turned on.

With this signal, the reverse clutches 24 and 34 are turned OFF at the same time as the band supply end side is fixed, and the known packing process of welding the band overlapping portion and cutting the band supply end is performed.

Since the present invention is configured as described above, it is possible to obtain an infinite tightening width without using a tension arm or a special differential reduction mechanism such as a lever, and it can be manufactured at a low cost and is trouble-free. A practically excellent packaging machine can be provided.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, with FIG. 1 being a schematic side view and FIG. 2 being a partially sectional plan view. B...Band, M...Motor, 12
...Main roller, 13...Sprocket, 14...Feed roller, 20...
...Input shaft, 30.30' ...Output shaft, 2
5.26...Gear, 31...Sprocket, 35.38...Gear.

Claims (1)

[Claims] 1 Two gears with a large diameter and a small diameter are provided on the human power shaft and the output shaft, respectively, and the large diameter gear on the input shaft and the small diameter gear on the output shaft are connected, and the small diameter gear on the input shaft and the one-way clutch on the output shaft are connected. The large-diameter gears provided on the input shaft are meshed with each other, and the interlocking pulley provided on the shaft is connected via a forward rotation clutch provided on the input shaft, and the interlocking pulley provided on the shaft is connected via a reverse clutch provided on the output shaft. The input pulley provided at the end of the input shaft is connected to a motor that always rotates in a constant direction, and the two gears on the input shaft are connected via a reversing clutch provided on the shaft. The two gears on the output shaft are provided so that they mesh and rotate, and the sprocket provided at the end of the output shaft is provided to interlock with the main roller, and the two gears on the output shaft are each provided with a slip plate. A packing characterized in that a feed roller is provided in sliding contact with the main roller to interlock with the main roller, and a packing band is wound around the pair of rollers in a substantially S-shape. Band tightening device on machine.