JPS58125416A - Method of adjusting stretching force of tape for packer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape tightening force adjustment method for a packaging machine that wraps a tape around the outer periphery of a packaged item. .

Wrap a thermoplastic tape around the outer circumference of the packaged item, clamp the end of the tape, tighten the tape to tighten the packaged item, then cut the tape midway and weld both ends of the corresponding tape by applying heat and pressure to secure the packaged item. Packing machines for binding are already widely used.

The above-mentioned packaging machine arranges the tape along the guide frame so as to surround the outside of the packaged item, clamps the tape midway near the end, and then tightens the tape to remove it from the guide frame. Wrap the tape directly around the package, tighten the package with the tape using the above tightening force, then clamp the ends and middle of the tape, cut the tape in the middle, and weld the upper and lower ends of the tape by applying heat and pressure. It is something.

Tape tensioning in conventional packaging machines involves a pair of rollers that clamp the tape while the tape is pulled from the reel and reaches the packaged item, and a tape tensioning roller that is placed between this tensioning roller and the packaged item. This is done using a tightening mechanism that is equipped with a detection switch that detects when the tape reaches a predetermined tension and stops driving the tightening roller.

By the way, it is necessary to change the tightening force of the tape depending on the packaged item and the type of tape.For this reason, the conventional tightening mechanism has a pair of tightening rollers pressed together by a spring, and a tape guide that acts on a detection switch. A spring was used to pull the tape in the direction of loosening.

The tightening force of the tape is adjusted by changing the pressure of each spring, but conventionally the pressure of each spring has been changed separately.

As described above, the structure in which the pressures of both springs are adjusted separately has the disadvantage that adjusting the tape tightening force is difficult and time-consuming, and the adjustment accuracy is extremely poor.

For example, even if you tighten the tension roller spring to increase the tape tension, if the elasticity of the spring that pulls down the tape guide is weak, the switch will operate before the desired tension is reached. cannot be achieved.

Furthermore, if the spring that pulls down the tape guide becomes stronger than necessary, slippage will occur between the tightening roller and the tape during the tightening process, and in this case as well, the purpose cannot be achieved.

As described above, in order to obtain the required tension in the tape tensioning mechanism, the most important issue is to adjust the pressures of both springs under equal conditions.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an adjustment method that can accurately adjust the tape tightening force in a packaging machine with a single touch.

Hereinafter, the present invention will be explained based on embodiments shown in the accompanying drawings.

As shown in Fig. 1, the main mechanism of an automatic packing machine used for tape binding is a main body 1 fixed in a case in which the packaged items A are placed, and a guide 2 placed on the top of the main body 1 so that it can be moved freely. A slide plate 3 is supported in this manner, and a guide plate 4 which is movable in the same direction as the slide plate 3 is provided at the bottom of the slide plate 3 with a slight gap.

A camshaft 5 driven by a motor M is mounted horizontally on the main body 1 at a lower position supported by a bearing. The tape B is cut by a movable clamp 6, a pressurizer 7 which is also vertically movable, a cutter lower blade 8 fixed at a fixed position for cutting the tape B in the middle, and the lower blade 8. A cutter upper blade 10 is rotatably mounted as shown in FIG. cutter lot 11,
A spring 12 that provides the upper blade 10 with rotational elasticity in a direction in which the tip thereof moves upward is arranged side by side.

Although not shown, a welding heater is provided between the slide plate 3 and the pressurizer 7, which appears and disappears after the guide plate 4 leaves work.

The camshaft 5 has a cam 13 for moving the crank 6 up and down, a cam 14 for moving the welding heater up and down, a cam 15 for moving the pressurizer 7 up and down, and a cam 15 for moving the slide plate 3 by the rotation of the camshaft 5. cam 16, and a cam 17 that moves the rod 11 up and down in order to rotate the cutter upper blade 10.
are installed in such a way that they operate at the same time.

A feed-out tightening mechanism 21 (hereinafter simply referred to as the tightening mechanism) for feeding and tightening the tape B is provided on the left side portion of the main body 1 in FIG. 1.

The tightening mechanism 21 includes a tape moving roller 22 rotatably attached to the main body 1, a presser roller 23 for final tape tightening that moves forward and backward with respect to the roller 22, and a presser roller 223. A pair of feed-out rollers 24 and 25 located at the rear with respect to the tape pull-out direction, a tape primary tightening tension detection switch, a tape primary tightening roller, etc., which are not shown but are located behind the feed-out rollers in the tape pull-out direction. arranged and configured.

The tape moving roller 22 is interlocked with a motor (not shown) via a rotation transmission means, and the forward and reverse rotation of the motor causes the tape B to be fed out (counterclockwise in FIG. 1) and the tape B to be tightened (counterclockwise). Rotation (clockwise in Fig. 1) is applied.

The tape final tightening press roller 23 is attached to a support fitting 26 disposed on the left side of the tape moving row 222 in FIG. 1 so as to freely rotate around a shaft 27.

The support fittings 26 are vertically long, and their upper ends are connected to each other by pins 28 at positions above the moving rollers 22 of the main body 1, and are mounted in a suspended state so that they can swing freely around the pins 28. are doing.

The tape final tightening press roller 23 is attached near the upper end of the support fitting 26 and is arranged at approximately the same height as the tape moving roller 22. It moves forward and backward relative to the roller 22.

The feed roller 24 is applied to the tape B pulled out from the reel.
．． 25, enters upward from the bottom between the tape moving roller 22 and tape final tightening presser roller 23, and guide roller 29 passes along the outer periphery of the tape moving roller 22.
After being guided and bent, the tape passes through a tape guide 31 provided on a guide roller 30 and is sent out toward the lower part of the slide plate 3.

Only when the tape moving roller 22 rotates in the tape tightening direction, the tape final tightening presser roller 23 approaches the tape moving roller 22 by an advancing/retracting mechanism 32, which will be described later, and pinches the tape B to perform the tightening process. The tape B is separated from the tape moving roller 22 except during the tightening process, and as shown in FIG. There is.

The feed rollers 24 and 25 are provided with close elasticity by a spring 34 so as to be in constant pressure contact with each other, and are normally operated by a solenoid 3.
5, the opened state is maintained, and when the tape is fed out, the solenoid 35 is de-energized, and the tape is held and fed out.

The advancing/retracting mechanism 32 that swings the tape tightening presser roller 23 includes a cam 36 fixed to the end of the camshaft 5 and a relative roller at a position corresponding to the cam 36 near the lower end of the support fitting 26. 237, and a tightening strength adjustment means 38 for imparting rotational elasticity to the support fitting 26 so that the tape final tightening presser row 223 is always in pressure contact with the tape moving row 222.

The cam 33 pushes the roller 37 with its protrusion to hold the tape final tightening press roller 23 in a position where the gap 30 is formed, and when the roller 37 falls to the lower part during the tightening process,
The tape final tightening press roller 23 is brought into pressure contact with the moving roller 22.

The adjustment means 38 includes a screw shaft 39 that is relatively proportional to the main body 1 so as to pass through the lower part of the support fitting 26, an adjustment screw 4o screwed into the tip of the screw shaft 39, and an adjustment screw 4o that is fitted onto the screw shaft 39,
It is composed of a spring 41 compressed between the adjustment screw 4o and the support fitting 26, and by changing the screwing position of the adjustment screw 40 and changing the repulsive force of the spring ring 41, the presser foot for final tightening can be used. Chive clamping force of roller 23,
That is, the tape tightening force can be selected.

In addition, the tape guide 31 can freely swing up and down around a pivot 42, and by utilizing the fact that it swings according to the tension of the tape B, a motor for detecting the tension of the tape is installed near the guide 31. A control switch S is arranged.

As shown in FIGS. 2 and 3, on the upper surface of the tape guide 31, pins 44, which are relative to the mounting brackets 43, are overlapped in a crosswise manner, and are constantly pressed down by the elasticity of the suffling 45 connected to the pins 44. When tape B becomes tense, spring 45
The guide 31 is rotated upwardly by enlarging the guide 31.

Therefore, by adjusting the tensile elasticity of the spring 45, the detection of the tape tension by the switch S can be adjusted in various ways.

The pressure of the spring 45 in the tape guide 31 and the spring 41 of the adjusting means 38 is controlled by the adjusting screw 40.
The adjustment screw 40 and the spring 45 are interlocked by an interlocking mechanism 51 so that they can be adjusted proportionally and simultaneously by the operation of .

As shown in FIG. 2, the interlocking mechanism 51 is supported horizontally by a guide 52 so as to move in the axial direction, and includes a rod 53 whose one end abuts the adjustment screw 40, and a rod 53 which swings about a pivot 54. An L-shaped link 55 is arranged, and the other end of the rod 53 abuts in the middle of the downward piece, and the L-shaped link 55
When the adjusting screw 40 is screwed in to increase the pressure on the spring 41, the L-shaped link 55 moves clockwise in FIG. 2 as the rod 53 moves. Rotate, link 56
This is to stretch the tin ring 45 and strengthen the pressing blade of the tape guide 31.

Therefore, by rotating the adjustment screw 40, the spring 4
1 and 45 change proportionally at the same time, and the presser roller 2
When the tape tensioning force of 3 and moving roller 22 is weakened, the tension for detecting the tape tension by the tape guide 31 is also weakened to match the tensioning force, and conversely, when the tape tensioning force is strengthened, the spring 45 stretches and the tape Detection of tension The tension also becomes less strong.

Therefore, when the pressure of the spring 41 is adjusted by the adjustment screw 4o, the interlocking mechanism 51 adjusts the amount of movement of the rod 53 so that the spring 45 controlled by the switch Sf also has tape tension detection elasticity corresponding to the tape tightening force.
The swing angle of the mold link 55, etc. are set.

The tightening force adjustment method of this invention has the above configuration,
Next, the effect will be explained.

The tape B pulled out from the reel is delivered to the feed roller 24
．． For 25 minutes, the tape passes through the tape guide frame from below between the moving row 222 and the presser roller 23, the tape guide 31, and the guide plate 4, and its tip enters between the slide plate 3 and the guide plate 4, and presses the limit switch S1. In this state, the packing work is started, and when the start switch is turned on, the motor M starts and the camshaft 5 rotates, and the clamp part 9 and the slide plate 3 close the tape B.
The middle of the insertion side is clamped to prevent it from coming out, and then the tape moving roller 22 rotates clockwise in FIG.
Since the holding roller 23 clamps the tape B with the moving roller 22, the tape B is tightened, and the tape B jumps out of the guide frame and becomes the same state as the first one where it is wrapped around the packaged item A.

When the tensioning force of the tape B reaches a predetermined tension, the tape guide 31 pulled up by the tensioned tape presses the switch S, which turns off the power to the motor that drives the moving row 222 and completes the tape tensioning process. .

At this time, the necessary tightening force of the tape B is determined by the spring 4 that presses the presser roller 23 against the moving roller 22.
1 and the elasticity of the spring 45 that controls the tape tension detection switch S, and the elasticity of both springs 41 and 45 is set in advance so as to obtain the required tape tension.

In order to adjust the elasticity of both springs 41 and 45, it is sufficient to change the amount by which the adjusting screw 40 is screwed in, and the pressure is adjusted at the same time by the interlocking mechanism 51.

When the switch S detects a predetermined tension, the motor M starts up again and the camshaft 5 rotates, and each cam attached to this camshaft first moves the guide plate 4 away and then moves the crank 6 up. Then, the overlapping part of tape B is simultaneously pressed with the slide plate 3 to keep the tape B in a tensioned state, and the cutter upper blade 10 then rotates downward, and the cutter lower blade 8 cuts the tape B in the middle. do.

At the same time, a heater is inserted between the upper and lower tapes,
The pressurizer 7 rises and presses the cut side of the tape B, and the heater is inserted between the upper and lower tapes to melt the 1-lower corresponding surface of the tape.

After the tape is melted, the heater is pulled out and the pressurizer 7 continues to press, so that the upper and lower tapes are processed and welded.

When the welding is completed, the pressurizer 7 is lowered, and then the crank 6
Since the slide plate 3 is pulled out from between the tape and the packaged item A, the packaged item A can be removed.

After that, the slide plate 3 and the guide plate 4 return to their original positions, the presser roller 23 moves to the separation position, and the feed roller 24
and 25 sends out the tape B, and with one revolution of the camshaft 5, all processes are completed and the tape stops, preparing for the next packing.

As described above, according to the present invention, the pressure of the spring that controls the operation of the switch that detects the tension of the tape and the spring that controls the pressure between the rollers for tightening the tape are adjusted at the same time. Since the tape tensioning force and the tape tension detection are always synchronized, it is possible to prevent the occurrence of inconveniences such as the tensioning process being stopped before a predetermined tension is reached or the tape being unnecessarily tightened. can.

Furthermore, detection of the tape tension and adjustment of the tape tensioning force can be performed with one-touch operation, which simplifies the work of adjusting the tape tensioning force.

[Brief explanation of drawings]

Figure 1 is a front view of the packaging machine used to carry out this invention, Figure 2
The figure is an enlarged longitudinal sectional front view of the main parts of the same as above, and the third factor is a perspective view of the tape guide portion of the same. 21...Tightening device, 22...Tape moving roller,
23... Tape press roller, 31... Tape guide, 38... Adjustment means, 40... Adjustment screw, 41.4
5... Suzu ring, 51... Interlocking mechanism, 53...
Rod, 55...L-type link. Patent applicant Yasutoshi Takami Agent Kama 1) Bun 2

Claims (1)

[Claims] A tape tightening force adjustment method for a packaging machine, characterized by simultaneously adjusting the pressure of a spring that controls the operation of a switch that detects tape tension and a spring that controls the tape clamping pressure of a pair of tape tightening rollers. .