JPH06525B2 - Tape tightening force adjusting device for packing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a packing machine in which a thermoplastic synthetic resin tape wound around an object to be packed is tightened and both ends of the tape are heat-welded. The present invention relates to a tape tightening force adjusting device for a packing machine, which is capable of freely adjusting the degree of tape tightening during a tightening process.

[Conventional technology and its problems]

An automatic packing machine that packs the outer periphery of the object to be packed with heat-sealable tape, clamps the middle part of the tip side of the tape inserted into the arch and then performs the tightening process with a tightening mechanism using a pair of tightening rollers. When the tape detached from the tape is wrapped around the package, the upper and lower overlapping parts of the tape are clamped, and then the steps of melting the upper and lower tapes, cutting the lower tapes, and welding by pressing the upper and lower tapes are performed continuously, and the welding is performed. When the object to be packed is completed and the object to be packed is removed, the feed roller is activated to feed the tape over the entire length in the arch and prepare for the next packing.

By the way, when an object to be packaged is wound up with a tape using the above-mentioned packing machine, the degree of tension of winding the tape must be changed according to the type and material of the object to be packaged.

That is, if the item to be packed is hard, the tension of the tape is strong,
Conversely, if it is soft, it is necessary to loosen the tension.

Conventionally, the tape tension in a packing machine is adjusted by, for example, pressing a pair of rollers constituting a tape tensioning mechanism with a spring and changing the tape holding force of both rollers by adjusting the pressure of the spring. Was adjusted.

However, the adjustment method as described above has a problem that it is difficult to finely adjust the pressure of the spring and it is difficult to obtain a tape tension degree corresponding to the type and material of the object to be packed. There is.

[Object of the Invention]

The present invention has been made to solve the above problems, and the tension of the tape can be adjusted easily and accurately, and the tape winding state suitable for the type and material of the object to be packed can be obtained. It is an object of the present invention to provide a tape tightening force adjusting device for a packing machine that can obtain the following.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a tightening completion detection switch around the rotary cam, which stops the tightening of the tape tightening mechanism by the operation of the rotary cam, in the cam rotation direction along the guide. It is arranged so as to be movable in an arc shape, and a configuration is adopted in which the tightening completion detecting switch is interlocked with a position adjusting mechanism for moving the tightening completion detecting switch along a guide.

[Action]

In the tightening process of the tape placed on the outer periphery of the item to be packed,
After the tightening mechanism is activated and the tape is tightened and the completion of the primary tightening of the tape is detected, the tightening mechanism performs the final tightening until the cam activates the tightening completion detection switch. Will be tied up with.

Select the arrangement position of the tightening completion detection switch in the cam rotation direction, match the time from the completion of primary tightening to the switch operation with the type and material of the object to be packed, and change the final tightening time by the tightening mechanism to change the tape Adjust the tightening force.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, a main part mechanism of an automatic packing machine using the tape tension adjusting device of the present invention will be described with reference to FIG.

A frame 1 is arranged in a case in which an object to be packed A is placed, a horizontal slide plate 3 is held on the upper part of the frame 1 so as to be movable by a guide 2, and a tape is provided on the lower part of the slide plate 3. From a guide plate 4 that moves integrally with the slide plate 3 with an insertion gap, a tape guide arch 5 having a substantially U-shape standing upright so as to surround the article A to be packed, and a terminal end of the guide arch 5. A tape guide member 6 that guides the tape B and a lid 7 that opens and closes a groove of the guide member 6 are provided between the slide plate 3 and the guide plate 4.

The slide plate 3 performs a two-step operation of a primary retraction and a secondary retraction by a cam mechanism, the guide plate 4 and the lid 7 move integrally with the slide plate 3, and the lid 7 is guided by the primary retraction. The groove 6 is open.

In addition, the guide plate 4 is shorter than the slide plate 3,
At the time of the primary retreat, the tape is moved away from the tape insertion position so that it does not hinder the processes such as tape clamping, welding and cutting.

In the frame 1, a second clamp 9 that is vertically movable in order from the left side in FIG. 1, holds the overlapping portion of the tape B with the slide plate 3, and a pressurizer 10 that is vertically movable.
A cutter lower blade 11 fixed at a fixed position for cutting the middle of the tape B, and the lower blade 11 is rotatably attached so as to cut the tape B, and the slide plate 3 is attached to the tip portion.
And a cutter upper blade 13 provided with a first clamp part 12 for holding the insertion side of the tape B with and a cutter lot 1 vertically movable to give the upper blade 13 rotation.
4 and a spring 15 that imparts rotational elasticity to the upper blade 13 in a direction in which the tip thereof rises are arranged side by side.

Although not shown, a welding heater is provided between the slide plate 3 and the pressurizer 10 so as to project and retract after the guide plate 4 retracts.

The slide plate 3 and the first and second clamps 12, 9 described above,
The pressurizer 10, the heater and the like are controlled by the cam group 17 of the cam shaft 16 driven by the motor M ₁ .

A reel 21 in which a tape B is wound below the frame 1.
The tape B is arranged so as to be rotatable, and the tape B pulled out from the reel 21 passes under the guide plate 4 and is inserted into the guide arch 5. During the movement of the tape B, the tape B is sent out. Feeding and tightening mechanism 2 for tightening
Two are provided.

The feeding and tightening mechanism 22 is provided with a roller 28 for exclusive use of tape feeding from a position near the reel 21 toward the guide plate 4,
29, rollers 30 and 31 for final fastening of tape, and tape B
And the guide members 32 are sequentially arranged.

A pool device 41 is arranged between the tape reel 21 and the delivery tightening mechanism 22 so as to pool the excess tape during the tightening process.

The pool device 41 is provided with an inlet 43 at a lower portion of a side surface facing the reel 21 of a pool box 42 having an appropriate size and an outlet 44 at a central portion of an upper wall, and a pair of upper and lower first rollers 45 outside the inlet 43. An outlet 44 at the bottom of the box 42
A pair of left and right second rollers 46 and a box 4 directly below
A pair of left and right third rollers 4 is provided in the upper part of 2 just below the outlet 44.
7 is disposed and a horizontal guide 48 having an open upper surface is provided between the first roller 45 and the second roller 46, and a vertical guide 49 is provided between the second roller 46 and the third roller 47. The tape B inserted in is automatically sent out to the outlet 44.

The vertical guide 49 partitions the inside of the pool box 42 into left and right chambers 53 and 54 in FIG. 1, and the tip of the tape B pushed up by the second roller 46 is attached to the left and right side plates 55 and 5.
In step 6, the third roller 47 is guided.

The vertical guide 49 is composed of a fixed side plate 55 facing the chamber 53 on the left side in FIG. 1 and a movable side plate 56 facing the chamber 54 on the right side in FIG. 1. The movable side plate 56 has a hinge 5 at one side edge along the vertical direction.
7, it is pivotally fixed to the fixed side plate 55, and is rotatable in the horizontal direction around the pivot 58 of the hinge 57, and the spring 59 has a rotational elasticity to return to the position shown by the solid line in FIG. Being energized.

When the movable side plate 55 is in a position facing the fixed side plate 56, a tape guide path 60 is formed between the facing surfaces of the movable side plate 55 and the second roller 46 while the third roller 47 is stopped.
When the tape B is sent out, the movable side plate 56 is pushed open by the tape B as shown by the alternate long and short dash line in FIG. 5, and the tape B is pooled in the chamber 54.

As described above, when the movable side plate 56 is configured to be horizontally rotated in the vertical guide 49, the movable side plate 56 is pushed open and the tape B pooled in the chamber 54 is aligned with the movable side plate 56. There is an advantage that such inconvenience can be prevented.

Further, when the second roller 46 is rotated in the reverse direction and the tape B is sent out to the first roller 45 side, the tape B projects from the upper surface of the lateral guide 48 into the chamber 53 and is pooled.

Next, as shown in FIGS. 1 to 4, the adjusting mechanism 71 of the tape tightening force at the time of the final tightening is performed by the cam 7 attached to the cam shaft 16.
2, a tightening completion detecting switch 73 arranged around the cam 72 so that the position can be freely adjusted, and the switch 7
3 and the position adjusting mechanism 74, and the switch 73
When the cam is operated by the cam 72, the tightening process of the tightening mechanism 22 is stopped.

The position adjusting mechanism 74 has an arc-shaped guide elongated hole 76 centered on the cam shaft 16 in a plate 75 standing upright in the vicinity of the cam 72, and a movable member attached to a pin 77 fitted into the elongated hole 76. The switch 73 is attached to the plate 78 and its detector 7
The protrusion 72a or the concave portion of the cam 72 is fixed to 3a so that the movable plate 78 is constantly pulled down to the lower end side of the elongated hole 76 by the spring 79 connected to the pin 77.

A drum 81 is attached to a position adjusting shaft 80 arranged above the plate 75, one end of a flexible strip 82 is fixed and wound on the drum 81, and the other end of the flexible strip 82 is connected to the pin 77. By rotating the position adjusting shaft 80 via the knob 83, the position of the switch 73 becomes adjustable along the elongated hole 76, and the switch 73 operates from the position of the completion of the primary tightening of the cam 72 shown in FIG. You can freely select the time for the final tightening until you do so.

FIG. 6 shows a specific control circuit of the packing machine and the tape tightening adjustment mechanism 71.

In the figure, a cam shaft driving motor M ₁ , a driving motor M ₂ for the tape feeding and tightening mechanism 22, a tape feeding completion relay R _9, and a tape feeding for activating the motor M ₂ in the tape feeding direction. Tape tightening relay R for activating relay R ₃ and motor M ₂ in the tape tightening direction
₂ and relay R for detecting the completion of the primary tightening of tape B
_5, the relay _{R 1} to drive the motor _{M 1} for camshaft
Are arranged in parallel between the power supplies, and the make contact R _1a of the relay R ₁ is connected in series to the camshaft motor M ₁ .

The motor _{M 2} of the tape feed tightening mechanism 22, make contact R _2a of the relay _{R 2} and _{R 3,} R _3a is connected, by energizing the relay _{R 2} or _{R 3,} switched tightening and feeding of the tape B is cut It is like this.

A switch H, which is switched by a cam of the cam shaft 16, and a make contact R _9a of the relay R ₉ are connected in series to the tape feeding completion relay R ₉ , and the tape feeding relay R ₃ has the cam switch H and A limit switch M for detecting completion of tape feeding and a cam switch F for starting tape feeding are connected in series.

A break contact R _9b of a tape feed completion relay R ₉ is connected in parallel to the tape feed completion detection limit switch M. When this switch M detects tape feed completion, the cam switch H and tape feed completion relay R are detected. ₉ is provided with a switching contact.

As shown in FIG. 1, the limit switch M for detecting the tape feeding completion is arranged at the left end portion in the figure between the slide plate 3 and the tape guide 4, and detects the tip of the tape B fed from the arch 5. It is like this.

The cam switch H and the tape feed relay R ₃ are connected via a manual tape feed switch S ₁ , and the switch S
_The tape B can be manually fed over the entire length of the arch 5 while pressing ₁ .

A start switch S ₂ and a tightening completion detection switch 73 are connected in series between the tape tightening relay R ₂ and the cam switch H, and the make contact R _2a of the relay R ₂ is connected in parallel to the start switch S _2. There is.

The relay R ₅ for detecting the completion of the tape primary tightening has a camshaft 16
One contact of a cam switch C controlled by a cam attached to the primary fastening detection switch E is connected in series, and the primary fastening detection switch E is connected to the make contact R _{5a of the} relay R _5.
Are connected in parallel.

As shown in FIG. 1, the primary tightening detection switch E is arranged at the position of the end portion of the arch 5 in the tape feeding direction, the tape tightening process is started, and the tape B is separated from the inside of the arch 5 to be packaged A. When the tape B is released from the end of the arch 5, the tape detachment movement or the opening of the lid of the arch 5 is detected.

Further, the cam switch C is configured such that the origin stop and the primary tightening start position stop are controlled by the cam of the cam shaft 16.

Motor M ₁ relay R ₁ of the cam shaft 16 is connected to the other contact of the cam switch C, make contact R _9a of the feeding completion relay R ₉ is interposed therebetween, the relay R ₁
And one contact of the cam switch C are connected via a make contact R _5a of a relay R ₅ for detecting completion of primary tightening.

Next, the packing operation of the automatic packing machine will be described mainly using the circuit diagram of FIG.

The circuit diagram of FIG. 6 shows a state in which the tape B is not loaded in the arch 5, and when the manual tape feed switch S ₁ is _first pushed, the tape feed relay R ₃ is energized via the cam switch H. , The make contact R _3a is closed, the motor M ₂ of the tape feeding and tightening mechanism 22 is activated in the tape feeding direction, the tape B is pulled out and fed into the arch 5, and the tape B is loaded over the entire length of the arch 5. When the tip pushes the limit switch M for tape feeding completion,
The tape feeding completion relay R ₉ is energized.

When the tape feed completion limit switch M is switched,
The power to the tape feeding relay R ₃ is cut off, and this relay R 3
Motor M ₂ in an open each make contact R _3a of ₃ infeed tape is completed stopped, solving pushing the manual tape feed switch S ₁ at this point.

By energizing the relay R ₉ for tape feeding completion, the make contact R _9a is closed, and the energized state is self-maintained, and
The motor relay R ₁ of the cam shaft 16 is energized, the make contact R _1a of the relay R ₁ is closed, the motor M ₁ is activated, and the cam shaft 16 rotates.

When the cam shaft 16 rotates, the first clamp 12 first rises, clamps the middle of the insertion tip side of the tape B with the slide plate 3, then the cam switch H switches, and at the same time the cam switch C starts the primary tightening. Switch to position, relay R
₁ is cut off, the contact R _1a is opened, the motor M ₁ is cut off temporarily, and the camshaft 16 is stopped.

In this state, place the object A to be packed above the slide plate 3,
When turning on the start switch S _2, relay tape tensioning through a cam switch H and tightening completion detection switch 73 R ₂
When the make contact R _2a is closed and the start switch S ₂ is opened, the relay R ₂ is kept energized and the motor M ₂ in the tape feeding and tightening mechanism 22 rotates in the tape tightening direction. Power is turned on and the tape tightening process begins.

Since the tip end side of the tape B is clamped by the first clamp 13 and the slide plate 3 in advance, the tape B loaded in the arch 5 is reduced in diameter by the start of the tightening process.
And is wound around the outer periphery of the article A to be packed directly.

When the tape B is tightened and released from the end of the arch 5, the primary tightening detection switch E is closed, the relay R ₅ for primary tightening completion detection is energized, and its make contact R _5a is closed to the relay R ₅ . At the same time, the relay R ₁ is energized to energize the motor M _{1 of} the cam shaft 16, the cam shaft 16 is rotated again, and the main fastening of the tape B is started.

When the cam shaft 16 starts rotating again, the tightening completion switch 7
The cam 72 acting on 3 rotates, and the time from the re-rotation of the cam 72 to the opening of the switch 73 is the time of the final tightening process.

That is, from the start of the primary tightening of the tape B to the completion of the final tightening, the motor M
No. ₂ is continuously rotating in the tape tightening direction. By selecting the time from the start to the stop of the main tightening process, tape B
It is possible to freely set the winding tightening force for the article A to be packed.

In FIG. 4, the switch 73 is arranged close to the protrusion 72a of the cam 72 at the final tightening start position, and the switch 73 is opened immediately after the start of the final tightening process to shorten the time of the final tightening process. , I try to get a loose tightening force.

FIG. 2 shows that the switch 73 is placed away from the protrusion 72a of the cam 72 at the final tightening start position, and it takes time from the start of the final tightening process until the switch 73 is opened. The tightening force will be increased by continuing the tightening process.

Therefore, by selecting the position of the switch 73 and changing the time from the start of the final tightening process to the opening of the switch 73,
A tightening force proportional to this time can be obtained.

When the tape tightening completion switch 73 is opened, the tape tightening relay R ₂ is de-energized, its make contact R _2a is opened, the motor M ₂ of the tape feeding and tightening mechanism 22 is stopped, and the tape tightening process is completed. The tape B is tightened with a predetermined tension on the outer circumference of the article A to be packed.

After this, since the cam shaft 16 is still rotating by the motor M ₁ ,
The packing machine clamps the tape overlapping portion by raising the second clamp 9, enters the heater between the upper and lower tapes, cuts the lower tape and pressurizes the upper and lower tapes and the heater by raising the pressurizer 10, and the upper and lower tapes of the heater. A series of tape welding steps such as retreating of the facing surface after melting, welding of the upper and lower tapes by the pressurizer 10, lowering of the first clamp 13, the second clamp 9 and the pressurizer 10 are performed, and the slide plate 3 retracts. Then, after coming out from between the object A to be packed and the tape B, it returns to the forward position.

Next, the tape feed start cam switch F is closed, the tape feed relay R ₃ is energized, the motor M ₂ of the tape feed tightening mechanism 22 rotates in the tape feed direction, and the tape B is fed into the arch 5, When the tape B is fed to the entire length of the arch 5 and the limit switch M for detecting the tape feeding completion is pushed at the tip thereof, the relay R ₃ is de-energized and the motor M ₂ of the tape feeding and tightening mechanism 22 is stopped. After the tape feed completion relay R ₉ is energized, the cam shaft 16 is rotated just once, the cam switches C and H are switched to the origin stop position, and the tape feed completion relay R ₉ is de-energized. The make contact R _9a is opened, and the cam shaft 16 stops due to the loss of power to the motor M ₁ ,
Each part stands by for the next packing work, and when the start switch S ₂ is turned on, the packing work is started again.

〔effect〕

As described above, according to the present invention, the tightening completion detecting switch is arranged around the cam so that the position can be freely adjusted in the rotation direction of the cam, and the position of the tightening completion detecting switch is adjusted by the position adjusting mechanism. When using the packing machine, set the position of the tightening completion detection switch with respect to the rotary cam,
It can be easily adjusted according to the type and material of the items to be packed,
The tape tightening force during packing can be freely set by adjusting the position of the switch, the tape tension can be set easily and reliably, and the optimum tape tightening force according to the type and material of the object to be packed can be obtained. be able to.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an essential part showing an example of an automatic packing machine,
FIG. 4 is a vertical sectional front view of the tape tightening force adjusting mechanism, FIG. 3 is a vertical sectional side view of the same, FIG. 4 is a vertical sectional side view in which the tape tightening force in FIG. 2 is loosely set, and FIG. 5 is FIG. 6 is an enlarged sectional view taken along the arrow V-V in FIG. 6, and FIG. 6 is a control circuit diagram of the automatic packing machine. 16 ... Cam shaft, 71 ... Adjusting mechanism of tape tightening force, 72 ... Cam, 73 ... Tightening completion detection switch, 74 ... Position adjusting mechanism.

Claims (1)

[Claims] 1. A tape tightening force adjusting device of a packing machine, wherein a tape arranged around an object to be packed is tightened by a tightening mechanism to wind the object to be packed, and both ends of the tape are welded together.
A tightening completion detecting switch for stopping the tightening of the tape tightening mechanism by the operation of the rotating cam is arranged around the rotating cam so as to be movable in an arc shape along the guide in the cam rotating direction. A tape tightening force adjusting device for a packing machine, characterized in that a position adjusting mechanism for moving the tightening completion detecting switch along a guide is interlocked with.