JPS644653Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention involves wrapping a thermoplastic band around a packaged item, tightening the band, heating and melting the opposing surfaces of both ends of the band, which overlap each other, and pressing the welded parts together. This invention relates to a band tightening force sensing device for a band-type packing machine that cuts a nearby band from its supply side.

When tightening a band around a packaged item, the tightening force varies depending on the type of packaged item.
In addition, the tightening force must not vary from package to package even if the same machine is used. Therefore, this must be grasped accurately and sharply.

Further, the operation of the next step that is successively performed in connection with this tightening must not be unclear.

However, although devices for sensing the tightening force have been found in conventional band packing machines, they all have complicated mechanisms, lack of sharp functionality, and have various drawbacks.

The mechanism of this invention is extremely simple and works very sensitively.A band is placed around the packaged item to tighten it, and the moment when the band is tightened without bending around the packaged item is sensed, and this and the camshaft The electromagnetic clutch is connected to a clutch mechanism that regulates the rotation of the electromagnetic clutch, and the electromagnetic clutch is used to powerfully tighten the clutch and precisely perform the required thermal welding operation.

This will be explained with reference to the diagram.

M is a motor. This motor M is capable of forward and reverse rotation, is a 100V single-phase motor, does not have a built-in brake, and can be instantly switched between forward and reverse rotation.

Note that a 200V single-phase one may also be used.

2 is a reducer, and the rotation of the motor M is transmitted to its input shaft 2'' through a pulley 6, belt 4, and double pulley 3. 7 is a detent attached to the input shaft 2'', and 8 and 9 are coaxial 2'' ″ and double pulley 3,
This is a one-way bearing fitted between the rotation stopper 7. Therefore, the speed reducer 2 can only rotate in a certain direction.

The belt 5 is passed between the small diameter pulley 3 of the double pulley 3 and the pulley 15 which is integrated with the small diameter pulley 3 of the double pulley 3 by the input of the electromagnetic clutch 14. 10 is an idler pulley that adjusts the tension of the belt 5.

11 is an electromagnetic clutch 14 or a pulley 15
This shaft pipe 11 has a tension/feed roller 1
It is fitted onto the rotating shaft 16 of No. 3 so as to be movable in the axial direction thereof. Then, the pin 18 protruding from the coaxial tube 16 is engaged with a notched recess 19 having an oblique side 19'' at the end of the shaft tube 11.The notched recess 19 is provided on the open surface of the shaft tube 11 on the side opposite to the electromagnetic clutch 14 side. A spring receiver 20 is fixed to the other end of the rotating shaft 16 forming a cam surface, and a spring 21 is installed between the spring receiver 20 and the end surface of the shaft tube 11.

_M1 is a micro switch whose contact 22
is caused by the transfer of the electromagnetic clutch 14.
contact with the rear surface of

That is, under normal conditions, the contact 22 of the microswitch _M1 comes into contact with the rear surface when the tensioning/feeding roller 13 is loaded and the clutch 14 is shifted, as will be explained later.

The structure of the shaft tube 11, pulley 15, electromagnetic clutch 14, etc. constitutes the main part of the present invention.

23 is an auxiliary roller that comes into pressure contact with the tightening/feeding roller 13. As shown in FIG. 2, the auxiliary roller 23 is mounted near the root of a lever 25 whose root is pivotally connected to a pin shaft 24 fixed to the machine frame. A pin 26 is fixed to the tip of the lever 25, and a pin 28 fixed to the bracket 27 is connected to the pin 26.
A spring 29 is placed between the two.

That is, this spring 29
, with the pin shaft 24 as the center, the auxiliary roller 23
is always pulled in the direction in which it is pressed against the tension/feed roller 13.

A band guide 30 guides the band between the rollers 13 and 23.

On the other hand, 2' is the output shaft of the reduction gear 2, and as shown in FIG. 2, a pin 31 is provided protruding from the end of the shaft, and this pin 31 engages with the first clutch shaft 32 of the clutch mechanism C. 33 is the first at the 36th end of the camshaft.
This is a one-way bearing installed between the clutch shaft 32 and the camshaft 36.

Reference numeral 34 denotes a second clutch shaft adjacent to the first clutch shaft 32, which is connected to the stepped portion 3 of the first clutch shaft 32.
A coil spring 35 is installed between the clutch shaft 2' and an adjustment collar 39 fitted behind the second clutch shaft 34. The coil spring 35 is attached to the first clutch shaft 32 and the second clutch shaft 34 so as to be tightened over the outer peripheries.
The protruding end 37 of is made to protrude outward from the stepped portion 32', and the other end 38 is inserted into a fixing hole 40 formed in the adjustment collar 39.

41 connects the second clutch shaft 34 to the camshaft 36
This is the key to fix it.

As shown in FIG. 3, the protruding end 37 of the coil spring 35 engages with a clutch arm 57 that rotates about a shaft 59 by energizing a solenoid 58, and normally operates as shown in FIG. Then, the clutch arm pin 60 is engaged with the clutch arm pin 60 thereof. 61 is a return spring of the same arm 57.

Cams 42, 44, and 45 are fixed to the camshaft 36 and restrict the vertical movement of the rear gripper 46, press bar 48, and front gripper 49. The cam 43 is a cam that operates the heater 62 (FIG. 1), and the cam 47 is a spacer between the rear gripper 46 and the press bar 48.

A timing cam 50 is pivotally attached to the end of the camshaft 36 and comes into contact with the micro switches M ₂ and M ₄ .

51, 52 are lower and upper guides, 53, 5
3 is a slide guide, and 54 is a slide table.

55 is a switch lever that abuts the tip of the inserted band, and 56 is a switch pin that is moved by the lever, and its outer end abuts against the micro switch _M3 .

Its effects will be explained.

The band guided from below by the band guide 30 is attached to the upper surface of the tightening/feeding roller 13 and the lower guide 51.
The band is guided onto the table via the bottom surface of the slide table 54, goes around the package on the table, and is inserted again into the bottom surface of the slide table 5 by the upper guide 52, and the tip of the band presses the switch lever 55 on the bottom surface of the table 54. Switch lever 5
5 moves the switch pin 56, and its outer end inputs the micro switch _M3 .

When the switch _M3 is input, the motor M rotates, and the solenoid 58 is energized, so that the clutch arm pin 60 and the protruding end 37 of the coil spring 35 of the clutch mechanism C are disengaged.

As a result, the rotation of the motor M passes through the pulley 6 belt 4 double pulley 3, rotates the reducer 2, and further passes through the clutch mechanism C to the camshaft 3.
6, and the front gripper 49 is rotated by the rotation of the cam 45.
moves up and first grips the band between the slide tables 54.

The camshaft 36 is stopped by the clutch arm 57 engaging the protruding end 37 of the coil spring 35.

At the same time, the micro switch _M2 is input by the rotation of the timing cam 50 at the end of the camshaft 36.
Now, the electromagnetic clutch 14, which forms the main part of the present invention, is input.

Now, the pulley 15, to which the rotation of the motor M is transmitted via the small pulley 3' of the double pulley 3 and the belt 5, rotates in synchronization with the electromagnetic clutch 14, and as the rotating shaft 16 rotates, the tensioning/feeding roller 13 rotates and pulls back the band by cooperating with the auxiliary roller 23 that is in pressure contact with it.

This pulling back eliminates the deflection between the packaged item and the band surrounding it, and when the band is further tightened, that is, when a load starts to be applied to the tightening/feeding roller 13, the shaft tube 11, which is the power transmission part, The axial thrust generated between the oblique side 19' of the notched recess 19 and the pin 18 overcomes the pushing force of the spring 21, and the axial tube 11 moves outward. That is, the pin 18 moves along the oblique side 19' of the notched recess 19 and comes to a stop at the short side 19'' parallel to the axis of the recessed portion.

In this way, when a load is applied to the tension/feed roller 13, the electromagnetic clutch 14 on the shaft tube 11 moves and its rear surface becomes the contact point ₂ of the micro switch M1.
2 and input it.

In response to this input, the solenoid 58 is energized, so that the previously engaged protruding end 37 of the coil spring 35 and the clutch arm 57 are disengaged, and the camshaft 36 begins to rotate.

Then, the rear gripper 46 is raised by the cam 42 to rear grip the band.

Thereafter, at the same time as the grip is completed, the electromagnetic clutch 14 is demagnetized by the input of the micro switch _M2 by the rotation of the timing cam 50.

During this time, the heater 62 is inserted between the upper and lower surfaces of the band by the operation of the cam 43, melts the upper and lower surfaces of the band, and then withdraws, and the press bar 48 is removed by the operation of the cam 44.
Crimp the band and cut the end of the band.

Once this is completed, the camshaft 36 stops rotating as the clutch arm pin 60 and the protruding end 37 of the coil spring 35 are again engaged.

Almost immediately before that, the timing cam 50 inputs the micro switch M ₄ to input the electromagnetic clutch 14 again to couple it to the pulley 15, and at the same time reverses the motor M to connect the tension/feed roller 13 and the auxiliary roller 23. The band is sent out by pressure welding.

In this case, even if motor M is reversed, reducer 2
Since a one-way bearing 8 is installed in the input shaft 2'' of the input shaft 2'', the input shaft 2'' does not rotate and is completely regulated by the stopper 7.

In this device, the pulley 15, together with the electromagnetic clutch 14, shifts when sensing its tightening force. In other words, the pulley 15 moves using the small-diameter pulley 3' of the double pulley 3 as a fulcrum, but the movement is almost a parallel movement, and since the belt 5 has a lot of bending, there is no problem with its conduction force. There isn't. Although this tightening force sensing device is provided on the tightening/feeding roller in this embodiment, it may also be provided on a simple normal tightening roller.

This invention provides a tightening force sensing mechanism in the electromagnetic clutch itself, senses this when a tightening load is applied, activates a microswitch that comes into contact with this, and operates the clutch mechanism with this microswitch. Since the processes are linked, the next process can be precisely regulated despite the simple structure. In addition, the contacts of the microswitch that are in contact with the electromagnetic clutch do not rotate when the clutch is normally inactive, so wear can be prevented.

[Brief explanation of the drawing]

Figure 1 is a plan view of the entire band-type packing machine, Figure 2
The figure is a longitudinal side view thereof, and FIG. 3 is a front view of the clutch arm portion. 2...Reduction gear, 2'...Reduction shaft, 11...Shaft pipe,
13...Tightening/feeding roller, 14...Electromagnetic clutch, 15...Pulley, 16...Rotating shaft, 18
... Pin, 19 ... Notch recess, 36 ... Camshaft, 46 ... Front gripper, 49 ... Rear gripper, M ... Motor, C ... Clutch mechanism.

Claims (1)

[Scope of utility model registration request] The shaft tube 1 is attached to the rotating shaft 16 of the tightening/feeding roller 13.
1 is fitted so as to be movable in the axial direction, and an electromagnetic clutch 14 is attached to the shaft tube 11 with a spring 21 for bringing it into pressure contact with a pulley 15, which will be described later.
and a pulley 15 which is integrated with the same electromagnetic clutch 14, and the pulley 15
and a motor M, and the rotating shaft 16
A pin 18 is provided protruding from the shaft tube 11.
The micro switch is configured to engage with a notched recess 19 provided on the open surface opposite to the electromagnetic clutch 14 side and forming a cam surface, and to be able to come into contact with the outer surface of the electromagnetic clutch 14 which is moved by the engagement force when the band is tightened.
This micro switch M ₁ is a clutch mechanism installed between the motor M, the reduction shaft 2' of the reduction gear 2 of the motor _M , and the camshaft 36 that operates the main parts of the machine such as the front and rear grippers 46 and 49. A band tightening force sensing device for a band-type packing machine, characterized in that the device controls the band tightening force of a band-type packing machine.