JPS6233124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packaging machine that tightens a thermoplastic resin tape wound around the outer periphery of a packaged item and heat-welds both ends of the tape.

[Conventional technology]

BACKGROUND ART Packing machines that wrap a packaged item with a tape made of thermoplastic synthetic resin and automatically weld both ends of the tape by applying heat and pressure are widely used in packaging operations.

The basic structure of the packing machine was developed by the applicant in 1982.
As proposed in No. 9305, as shown in FIGS. 6 to 8, a board 52 is supported in a horizontally movable manner by a guide 51 of a table on which a package is placed, and a tape is inserted below this board 52. A first clamp 53 that secures the end portion with the substrate 52, a second clamp 54 that secures the overlapping portion of the tape B after tightening the tape B wound around the packaged item A, and presses the upper and lower overlapping portions of the tape B. A pressurizer 55, a cutting mechanism that cuts the lower tape of the overlapping tapes with the fixed lower blade 56 and the cutting edge of the first clamp 53, and a heater (not shown) that can be freely inserted and removed between the upper and lower tapes are arranged. ,
These forward and backward movements and up and down movements are controlled at the same timing by a cam mechanism 57, and the tape B is fed out and tightened by a tape feeding and tightening mechanism 60 comprising a pair of rollers 58 and 59.

The above-mentioned operation of the packing machine involves pulling out the tape B stored in the table, wrapping it around the packaged item A, securing the end with the first clamp 53, tightening the tape to tighten the packaged item, and then Then, the upper and lower tapes are locked with the second clamp 54, the upper and lower tapes are pressed by the pressurizer 55, the heater enters between the upper and lower tapes, and the lower tape is cut to weld both ends of the tape.Finally, the board 52 is moved laterally. The tape is removed from between package A and tape B.

The tapes used in the above-mentioned packaging machines vary depending on the purpose, from wide to narrow, so each part of the packaging machine is configured to accommodate wide tapes. I have to.

[Problem that the invention seeks to solve]

By the way, the strength of the welded portion of the tape depends on the amount of overlap between the upper and lower tapes, and in the case of a wide tape, there is no problem even if the upper and lower tapes shift in the width direction because a sufficient welded area can be obtained.

However, in the case of narrow tapes such as 6 mm or 9 mm wide, if a deviation occurs in the width direction during welding, the welding area will become extremely small and the welding strength will decrease, so when welding narrow tapes, , alignment of the upper and lower tapes in the width direction is extremely important.

In addition, when the tape is wide, its tensile strength is high, so the welding and cutting mechanisms must be made strong, which increases the size of the entire packaging machine and complicates its structure, increasing manufacturing costs. It is expensive and extremely uneconomical in the use of narrow tapes.

Furthermore, the above-mentioned conventional packaging machine has a structure in which the board 52 is supported by the guide 51 so as to be movable laterally, and the clamp, the pressurizer 55, etc. are arranged directly below the board 52.
Maintaining accuracy in step 2 is an important point in determining the durability of the packaging machine itself.

However, since the board 52 has a sliding structure along the guide 51 and a rotating link for sliding, troubles caused by wear of various parts may occur.
There are problems such as insufficient clamping, insufficient pressure, and problems with sliding surfaces and rotating parts.

This invention was made to solve the above-mentioned problems, and has a simple structure, small size, and low cost, and allows accurate widthwise positioning of the upper and lower tapes, especially when using narrow tapes. It is an object of the present invention to provide a packaging machine which is suitable for the present invention and has improved durability by eliminating the sliding surface and rotation of the tape welding receiving part.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a packaging method in which both ends of a tape wound around a packaged item are tightened, then overlapped and clamped, and the overlapping surfaces of the tapes are welded by heat and pressure. In a machine, a swinging member whose lower part is pivoted to a fixed part can be freely swung between an upright position and a tilted position to one side, around the pivoted lower part, and the upper part of this swinging member is tilted to the other side. A pedestal for connecting the tape is provided at the position, and the swinging member has a clamp located directly below the pedestal that is movable up and down and clamps the tape between the pedestal and the tape cutting mechanism in the raised position, and a tape cutting mechanism that is also movable up and down. A tape crimping device that presses the tape against a pedestal in the raised position and a cam mechanism that moves the clamp and tape crimping device up and down are installed, and the other side on which the pedestal of the swinging member in the upright position is provided. The swinging member, which is in an upright position, can freely move forward and backward relative to the lower part of the pedestal, and
When the pedestal is in the forward position directly under the pedestal, a tape insertion guiding part is formed with the bottom surface of the pedestal, and a tape guide is arranged that retracts from directly below the pedestal in conjunction with the rise of the clamp or tape crimper. After the connection process is completed, the swinging member in the upright position is tilted to the retracted position on one side, and the pedestal is pulled out from between the package and the connection tape.

[Effect]

With the swinging member upright and the first clamp, pressurizer, and second clamp in the lowered position, place the package on the top plate, wrap the tape pulled out on the top plate around the package, Insert the tip of the tape into the insertion guiding part between the pedestal and the guide piece in the guide groove.

When the tip of the tape presses the switch via the lever, the motor starts and the camshaft rotates. First, the first clamp holds the upper tape with the pedestal, and then the tape is tightened to the specified tension. Once reached, the second clamp rises and clamps the overlapping part of the upper and lower tapes with the pedestal, after which the pressurizer rises, cuts the lower tape, pressurizes the upper and lower tapes and the heater inserted between them, and removes the upper and lower tapes. When the heater is removed after melting, the tape will be welded.

When both clamps and the pressurizer are lowered after tape welding, the swinging member is tilted in the retreating direction, and the pedestal is removed from between the package and the tape.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5 of the accompanying drawings.

As shown in the figure, a pull-out groove 3 for the thermoplastic tape B is provided on the top plate 2 of the table 1 on which the packaged item A is placed, and a bearing member 5 is located below the pull-out groove 3 on the bottom plate 4 inside the table 1. is fixed.

A main shaft 6 parallel to the tape pull-out groove 3 is attached to the bearing member 5, and a plate-shaped swinging member 7 whose lower end is attached to the main shaft 6 swings about the main shaft 6.

When this swing member 7 stands upright as shown in FIG. 1, its upper end has a height that approaches the top plate 2, and the vertical left side in the figure is aligned with the right side edge of the pull-out groove 3. From this upright position, it can rise and fall in the space on the right side of the figure.

On the left side surface of the swinging member 7 in FIG. A cam mechanism 10 is attached to the cam mechanism 10.

In the illustrated case, the protruding width of the tape connection pedestal 8 is equal to the width of the tape pull-out groove 3, for example, 6 mm, 9 mm.
The width corresponds to the narrow width tape.

As shown in FIG. 2, the holder 9 has a first clamp 11 that holds the upper insertion tape B ₁ with the pedestal 8.
, a pressurizer 12 that presses the upper and lower tapes, and a second pressurizer that simultaneously pushes up and holds the upper and lower tapes on the pedestal 8.
A lifting mechanism group consisting of a clamp 13 is held so that it can move up and down, and a pull-out hole 14 for the lower tape B ₂ is provided at the upper end of the first clamp 11, and the edge of the pull-out hole 14 and the The upper end of the pressure device 12 constitutes a cutting blade for the lower tape, and as the pressure device 12 rises, the lower tape _B2 is cut halfway.

The cam mechanism 10 has a horizontal cam shaft 16 rotatably attached to the swinging member 7 with a bearing 15, and a cam 1 that raises and lowers the first clamp 11 on the cam shaft 16.
7, a cam 18 that raises and lowers the pressurizer 12, and a second
A cam 19 for raising and lowering the clamp 13, a cam 20 for swinging the swinging member 7, and a cam 21 for tightening and feeding the tape B are fixed,
The camshafts 16 are driven by a motor M to operate each camshaft at a predetermined timing.

Although tape B is not shown, it is pulled out from the reel stored in the table 1, passes through the pull-out hole 14 of the first clamp 11, passes between the pedestal 8, the pressurizer 12, and the second clamp 13, and enters the pull-out groove. 3 onto the table 1, and after winding the package A, its tip _B1 is inserted directly under the pedestal 8.

During the movement of the tape B until it enters the pull-out hole 14, a driving roller 22 for tightening and feeding out the tape B, a driven roller 23 that presses the tape B against the driving roller 22, and a driving roller 23 to control the pulling strength of the tape B. A detecting switch 24 is arranged by being attached to the swinging member 7.

Although the driving roller 22 is not shown in the drawing, it is given forward and reverse rotation by a motor, and the driven roller 23 is rotated by the cam 21.
It moves up and down around the pivot shaft 25, and comes into pressure contact with the drive roller 22 when feeding and tightening the tape B, and at the separated position, the tape can be freely pulled out manually.

The switch 24, which detects the strength of the tape B, is pressed by the tape that has reached a predetermined strength during the tightening process, and stops the motor of the drive roller 22.

In the illustrated case, the switch 24 and the driven roller 23 are interlocked via an adjusting rod 26 and springs 27, 28, and the pressure of the springs 27, 28 is changed by the vertical movement of the adjusting rod 26 caused by the rotation of the adjusting knob 29. The tightening strength of the package A can be freely set according to the conditions of the package A.

A rectangular frame-shaped side slip prevention fitting 30 is fixed on the lower surface of the top plate 2 of the table 1 at a position facing the pedestal 8 of the swinging member 7 and the tape pull-out groove 3, so that the swinging member 7 stands upright. At this time, as shown in FIG. 1, the end surface of the pedestal 8 comes into contact with the prevention fitting 30, and the tip of the tape is inserted between the opposing surfaces of the swinging member 7 and the prevention fitting 30 at the bottom of the pedestal 8. A guide groove 31 is formed to position the tape _B1 in the width direction.

Note that when the swinging member 7 is raised, the first clamp 1
1. Pressurizer 12, holder 9 of second clamp 13
The upper part protruding from the prevention fitting 30 and the swinging member 7
It fits between.

A tape guide 32 as shown in FIG. 5 is housed inside the lateral slip prevention fitting 30, and is swingable about shafts 33 on both end faces supported by the lateral slip prevention fitting 30.

This tape guide 32 has a prevention metal fitting 30 at the upper end.
A spring 35 imparts rotational elasticity in the direction of contact with the stopper 34, and the surface facing the swinging member 7 is
A guide piece 36 is provided that protrudes into the guide groove 31 in an upright state due to contact with the stopper 34, and this guide piece 36 has a tape insertion guiding portion 37 between its upper surface and the lower surface of the pedestal 8. This restricts the vertical movement of the tip tape B ₁ when inserting the tape, so that the tip tape B ₁ can accurately enter along the lower surface of the pedestal 8. The tape insertion guiding section 37 has a shape surrounded on all sides by the pedestal 8, the guide piece 36, the side slip prevention fitting 30, and the swinging member 7.

The lower surface of the guide piece 36 is formed into a tapered surface 36a, and when the upper end of the first clamp 11 comes into contact with this tapered surface 36a when the first clamp 11 is raised, the guide piece 36 is pushed toward the inside of the one-piece stopper fitting 30, and the first Clamp 1
1. The pressurizer 12 and the second clamp 13 are retracted to a position that does not interfere with their upward movement.

A swinging lever 38 is attached to the tip of the tape guide 32, and the tip of the tip tape _B1 inserted into the guide section 37 comes into contact with a swinging lever 38, and the lever 38 pressed by the tip of the tip tape _B1 starts the motor M. The switch 39 is pressed.

In the swinging member 7, a horizontally long through hole 40 is provided below the part where the pedestal 8 is provided, and a heater that can freely appear and retract into the guide groove 31 from the through hole 40 on the right side of the swinging member 7 in FIG. 41 are arranged.

This heater 41 is attached to a slider 43 held so as to be horizontally movable by a guide rod 42 erected on the bottom plate 4, and its lower end is attached to a bearing member 5.
The upper end of the swinging lever 44 pivoted to the slider 4
3, and a swinging lever 4 by a cam mechanism 10.
4, the heater 41 moves forward and backward.

The swinging member 7 is always in the upright direction by the spring 45, and the heater 41 is always in the guide groove 3 by the spring 46.
1 is given elasticity in the direction of entering the heater 41
A rotor 47 attached to the lower part of the swing lever 44 contacts the cam 17, and controls the forward and backward movement of the heater 41.

In the illustrated case, the cam 17 of the first clamp 11 is also used for the heater 41, but a dedicated cam is used for the cam shaft 1.
6 may be installed.

A rotor 48 is attached to the bearing member 5 at a position corresponding to the outer circumference of the cam 20, and while the large diameter portion of the cam 20 is mounted on the rotor 48, the swinging member 7 is tilted as shown in FIG. held in position.

The packaging machine of this invention has the above configuration,
Next, the packing operation will be explained.

As shown in FIG. 2, the first clamp 11, the pressurizer 1
2. The second clamp 13 is in the lowered position, the driven roller 23 separates from the driving roller 22, the swinging member 7 stands up as shown in FIG. 1, and the tape B is fed out onto the top plate 2 for a predetermined length. Place the packaged item A on the top plate 2 in this state.

Wrap the tape B pulled out on the top plate 2 around the packaged item A, and wrap the tip tape B ₁ between the pedestal 8 and the guide piece in the guide groove 31 formed between the swinging member 7 and the side slip prevention fitting 30. Insertion guide part 3 between 36
Insert into 7.

The tip of the tip tape B ₁ is restricted in the top, bottom, left and right, so it has to go straight, and the first clamp 11
The lower tape _B2 passing through the pull-out hole 14 and heading onto the table 1 is positioned in the width direction.

When the tip of tip tape B ₁ presses lever 38,
The switch 39 is turned on, the motor M starts, the camshaft 16 rotates, the first clamp 11 rises, and as shown in FIG.
B Stick with ₁ . In this state, the motor M is temporarily stopped.

Since the first clamp 11 pushes up the guide piece 36 when rising, the tape guide 32 is retracted so as to fit inside the side slip prevention fitting 30 as shown in FIG.

Next, the driven roller 23 is brought into pressure contact with the driving roller 22 via the tape B by the action of the cam 21, and at the same time, the motor for the driving roller 22 is activated in the tightening direction.
The tape A is tightened by the rotation of the drive roller 22.

When the tape B wound around the package A reaches a predetermined tension, the switch 24 detects this and stops the motor of the drive roller 22.

At the same time, motor M is energized and camshaft 1
6 starts rotating again, the second clamp 13 rises, and clamps the tip of the upper tape B ₁ and the lower tape B ₂ with the pedestal 8 in an overlapping state.

Next, the pressurizer 12 moves upward, and the lower tape B ₂
While rising, the tape is cut by the first clamp 11, and the lower tape between the second clamp 13 and the cut portion is pushed up.

As the pressurizer 12 rises, the heater 41 moves forward by the cam 18 and enters between the upper and lower tapes B ₁ and B ₂ through the through hole 40 of the swinging member 7, and the pressurizer 12 moves between the upper and lower tapes and the heater sandwiched between them. 41 is pressurized, and the heater 41 heats and melts the upper and lower surfaces of the tape, and then the tape is pulled out to the retracted position.

The pressurizer 12 further applies pressure to the upper and lower tapes B ₁ and B ₂ , so that the overlapping portions of the upper and lower tapes are welded.

When welding is completed, the first clamp 11 and the pressurizer 1
2. The second clamp 13 is lowered, and the tape guide 32 has the guide piece 36 in the guide groove 31 as shown in FIG.
Return within.

Next, the large diameter portion of the cam 20 rests on the roller 48 of the bearing member 5, the swinging member 7 is tilted in the direction away from the side slip prevention fitting 30 as shown in FIG. When the tape comes out from between A and B, the motor M stops.

The motor of the drive roller 22 is started again in the feeding direction, and the drive roller 22 and the driven roller 23 feed the tape B by a limited amount onto the table 1. After that, the drive roller 22 stops and at the same time the driven roller 23 starts moving. Rising separation, tape B
It is in a ready-to-draw state and is waiting for the next packaging.

〔effect〕

Since the present invention has the above configuration, it has the following effects.

(1) A pedestal for tape connection, clamps, a pressurizer, and a cam mechanism that moves these up and down are attached to a swinging member that swings around the bottom, and after welding the tape, the package is moved by tilting the swinging member. Since the pedestal for connecting the tape can be removed from between the tape and the tape, the important mechanism of the packaging machine can be set on the swinging member, and the whole is compact, and the manufacturing cost is reduced due to the miniaturization and simplification of the shape. Moreover, there is no sliding or rotating part in the receiving part during tape welding, and troubles due to wear can be prevented.

(2) The swinging member and tape guide restrict the movement of the insertion tape in the width direction, and the tape connection cradle and tape guide restrict the vertical movement of the insertion tape, improving the positioning accuracy of the insertion tape. This has greatly improved the widthwise position of the upper and lower tapes at the welding area, making it possible to reliably weld the entire width of the tape.

(3) Since it is possible to weld the entire width of the upper and lower tapes at the welding part, especially for 6 mm to 9 mm
Maximum welding strength can be obtained even with tapes as narrow as

(4) Since the insertion of the tape tip into the welded part is guided by the pedestal, tape guide, and swinging member, the tape can be easily inserted into the welded part.
Welding work using narrow tape can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a front view of the packing machine according to the present invention immediately before the start of packing, Fig. 2 is a side view of the same, Fig. 3 is a front view during the welding process, Fig. 4 is a front view at the end of the welding process, FIG. 5 is a perspective view of a tape guide used in the same, FIG. 6 is a front view showing a conventional packaging machine, FIG. 7 is an enlarged front view of the main parts of the same, and FIG. 8 is a plan view of the same. 1 is a table, 2 is a top plate, 3 is a drawer groove, 7 is a swinging member, 8 is a pedestal for tape connection, 9 is a holder,
10 is a cam mechanism, 11 is a first clamp, 12 is a pressurizer, 13 is a second clamp, 14 is a withdrawal hole, 16
is a camshaft, 30 is a lateral slip prevention fitting, 31 is a guide groove, 32 is a tape guide, 36 is a guide piece, 37
numeral 41 is a tape insertion guide portion, and 41 is a heater.

Claims (1)

[Claims] 1. A swinging member whose lower part is pivoted to a fixed part in a packaging machine that clamps both ends of a tape wound around a packaged item after tightening them, and then welds the overlapping surfaces of the tapes together by applying heat and pressure. is able to swing freely between an upright position and a tilted position toward one side around the lower part of the pivot, and a pedestal for tape connection is provided at the top of this swinging member at a position on the other side. The moving parts include a clamp located directly below the pedestal that can be raised and lowered to clamp the tape between the pedestal and the pedestal in the raised position, a tape cutting mechanism, and a tape crimper that can also be raised and lowered to press the tape against the pedestal in the raised position. and a cam mechanism for raising and lowering the clamp and tape crimping device, and a holder for the swinging member in the upright position is installed at a position opposite to the other side on which the cradle for the swinging member in the upright position is provided. It can freely move forward and backward relative to the bottom of the stand,
When the pedestal is in the forward position directly under the pedestal, a tape insertion guiding part is formed with the bottom surface of the pedestal, and a tape guide is arranged that retracts from directly below the pedestal in conjunction with the rise of the clamp or tape crimper. After the connection process is completed, the swinging member in the upright position tilts to the retracted position on one side so that the pedestal is pulled out from between the packaged item and the connection tape.