JPS5813405B2 - Tape tightening device in semi-automatic packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape tensioning device that can vary the tape tensioning force during packaging over a wide range in a semi-automatic packaging machine.

Generally, the tape tightening force against the object to be packed is varied by adjusting the excitation current of an electromagnetic clutch interposed in the tape transport mechanism.

However, in the tape feeding process of a semi-automatic packing machine, the weight of the tape reel wrapped with tape is several tens of kilograms.
Therefore, a considerable amount of pulling force is required to pull out the tape from the reel, and it is impossible to obtain a tape tightening force lower than this pulling force, so the adjustable range of this tape tightening force is very limited. It has to be a narrow range,
Therefore, even if an electromagnetic clutch such as a temporary electromagnetic powder clutch having a wide range of variable torque characteristics is used, it cannot be used effectively.

In addition, when using a friction plate type electromagnetic clutch, due to its characteristics, when operating at a torque less than 60 to 70 times the rated torque, the value varies, so the voltage is set so as to obtain the required pulling force. Even so, the required pulling force may not be obtained, so the voltage must be set high, which has the disadvantage that the variable range of torque is further narrowed.

Furthermore, due to its characteristics, electromagnetic clutches have a delay time in changing the transmitted torque in response to changes in the applied voltage, and for this reason, as shown in JP-A-52-92697, for example, the tape may wrap around the packaged item. If a tightening control voltage that is lower than the tape feed set voltage is applied at this point, excessive tightening force will be applied at the initial tightening stage, and the items to be packed that require weak tightening force, such as items that are easily broken or deformed, will be This has the disadvantage that it is not possible to obtain a tape tightening force that is substantially less than the tape feeding force.

The present invention provides a tape tensioning device for a semi-automatic packaging machine in which there is no tape guide arch and the tape tip is manually inserted into a sealer unit, and the tape is fed and tightened by a tape transport mechanism that is rotationally driven via an electromagnetic clutch. During feeding, a relatively high feeding setting voltage is applied to the electromagnetic clutch to obtain a transmission torque large enough to feed the tape, and at the time of tightening, that is, when the tape tip is inserted into the sealer unit and the motor starts reversing, it is possible to apply a relatively high feeding setting voltage to the electromagnetic clutch. It is an object of the present invention to provide a novel tape tensioning device that can vary the tape tensioning force over a wide range by applying a control voltage that is low enough to obtain a tensioning force that corresponds to the strength of the object.

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

In the figure, 1 is a casing, 2 is a mounting table for an object to be packed, and the object to be packed P is placed on the mounting table.

Reference numeral 5 denotes a tape transport mechanism having, for example, a feed roller 6 and a driven roller 7 that rolls into contact with the feed roller 6. A packing tape 9 made of synthetic resin drawn from a tape reel 8 is clamped between the rollers 6 and 1, and the feed roller 6 is moved in the correct direction. The tape 9 is sent out and pulled back by reversing the tape 9.

Reference numeral 11 denotes an operating mechanism (sealer unit) for cutting and gluing the tape 9 wrapped around the object to be packaged at the overlapping part. A sliding table 15 that slides back and forth at the upper part has a heating plate 16 for welding the tape 9 at its overlapping part, for example, and the levers 12, 13, and 14 are moved in a predetermined order according to the rotation of the camshaft 170. It moves up and down.

There are two types of feed roller 6 and camshaft 170 rotation drive mechanisms: one-motor type and two-motor type. In the former case, as shown in FIG. 2, two pulleys 21 and 22 are fixed to the rotating shaft of motor MO, and the 21 to the camshaft 17 via the belt 23, electromagnetic clutch 24 and worm gear 25, and the pulley 32
are connected to the feed roller 6 via a belt 27, for example, a friction plate type electromagnetic clutch 28, and a counter gear 29, respectively.
In the latter case, as shown in FIG. 3, the rotating shaft of one motor M1 is connected to the camshaft 17 via a belt 31 and a worm wheel 32, and the other motor M2 is connected to a belt 34, an electromagnetic clutch 35, and a counter gear 36. The feed rollers 6 are connected to the feed rollers 6 through the feed rollers 6, respectively.

Note that these rotation transmission mechanisms are not limited to the embodiments shown in the figures, and any other transmission mechanism may be used, such as a gear instead of a belt.

S3, S4, and S5 are switches that detect the rotation angle of the camshaft 170.

Thus, the operation of the electromagnetic clutch 28 is controlled by the control circuit shown in FIG.

That is, for example, a normally open contact a21 of a relay A2, which will be described later, and the electromagnetic clutch 2 are connected between the power lines Ll and L2, which are supplied with a set DC voltage that is less than the rated value of the electromagnetic clutch 28.
A normally open contact a11 of relay A1 and a normally closed contact a of relay A3, which will be described later, are inserted in parallel with this.
31 and the variable resistor VR are inserted, and the slider SL of the variable resistor VR is connected to the contact a21 and the electromagnetic clutch 2.
It is connected between 8.

Also, relay A1 has one end connected to power line L2, the other end connected to line A3's normally closed contact a32, and relay A1's self-holding contact al.
2 and the detection switch S4, and a normally closed contact k of a timer T, which will be described later, are connected in series to the power supply line L1.
It is connected to the.

The relay A2 has one end connected to the power line L2, and the other end connected to the power line L1 through a parallel circuit of the self-holding contact a22 and the make contact m of the detection switch S3, and the normally closed contact k, and is connected in parallel with the relay A2. Normally closed switching contact k
A timer T is connected.

The relay A3 has one end connected to the power line L2, and the other end connected to the power line L1 through a self-holding contact a33, a parallel circuit of the switch S5, and a break contact b and a normally closed contact k of the detection switch S3.

Next, the operation of the above configuration of the present invention will be explained.

Now, as shown in FIG. 1, the packing tape 9 is pulled out from the reel 8, passes between the feed roller 6 and the driven row 27, and is introduced under the table 15, and the transmission mechanism is of the one-motor type shown in FIG. shall be.

In a semi-automatic packaging machine, when the tape tip is inserted into the sealer unit, the motor reverses direction and immediately begins the tightening process.

The motor MO is driven to rotate in the opposite direction, and the electromagnetic clutch 24 is activated to rotate the camshaft 17. In response, the lifting rod 14 rises and clamps the starting end of the tape between it and the table 15.

Next, the detection switch S4 related to the camshaft is turned on,
As a result, the link A1 is energized and self-held, and its contact all is closed, so that a control voltage that is lowered depending on the object to be packed is applied to the electromagnetic clutch 28 by the variable resistor VR, and this clutch transmits transmission. The torque is operated so as to generate a transmission torque of a value depending on the object to be packed.

Based on this, the feed roller 6 is reversed (rotated clockwise in FIG. 1) to tighten the Tezo 9, and then the camshaft 170 turns raises the lifting rod 12, and the tightening side end of the tape 9 is placed between it and the table 15. be clamped.

Next, the detection switch S5 associated with the camshaft 17 is turned on, and the relay A3 is energized, which is self-retained and its contact a31 opens, thereby turning on the electromagnetic clutch 28.
energization is cut off, rendering it inactive, and relay A1 is deenergized.

During this time, the camshaft 17 continues to rotate, so the heating plate 16 is inserted between the tapes, and the lifting rod 13 is raised to cut and bond the tape 9.

When the camshaft 17 returns to its original position, the associated detection switch S3 is turned on, and the camshaft 17 is stopped. At the same time, its boolean contact b is turned off and its make contact m is turned on, deactivating the relay A3. and relay A2
is energized, a rated voltage is applied to the electromagnetic clutch 28, and this clutch is operated to generate a rated dynamic friction torque.At the same time, the timer T is energized and the motor MO is rotated in the forward direction.

Therefore, the feed roller 6 rotates normally (counterclockwise in FIG. 1) and feeds the tape 9 onto the mounting table 2.

When the timer T times out after a desired time, the contact k is instantaneously turned off and the relay A2 is deenergized, thereby cutting off the power to the electromagnetic clutch 28 and stopping the motor MO to return to the initial state. Return.

When the transmission mechanism is as shown in FIG. 3, the motor M1 is rotated only in the region in which the camshaft 17 in FIG. is stopped by the detection switch S5, and normal rotation drive is started by the detection switch S3 and controlled to stop when the timer T times out, and in response, the operation of the electromagnetic clutch 35 is controlled by the circuit shown in FIG. or as shown in FIG. 5, contact a of relay A2 in FIG.
21 is omitted, and in its place is a normally open contact a3 of relay A3.
4 is inserted, and the break contact b of the detection switch S3 is omitted and short-circuited to operate the electromagnetic clutch 3.
6 is applied with the control voltage dropped by the variable resistor VR by the detection switch S4, and the detection switch S
5, apply the rated voltage and switch contact k of timer T.
control to cut off the current by turning off relay A1 and switch S, or
4 is omitted, and a control voltage corresponding to the object to be packed is constantly applied to the electromagnetic clutch 36 by an operating circuit in which relay contacts all are short-circuited, and this is applied only when the tape is fed out, that is, after the detection switch S3 is turned on, the timer T is applied. By applying the rated voltage until the time is up and the contact k is turned off, the same packing function as in the case of FIG. 2 can be obtained.

In the case of Fig. 6, if the required power is applied between power lines L1 and L2 by turning on the start switch (not shown), and the power is cut off by the operation of contact k of timer T, it will not be used. This is economical because it is possible to suppress the application of voltage to the electromagnetic clutch 36 at times.

As described above, according to the present invention, a required voltage lower than the rated voltage is applied to the electromagnetic clutch when feeding the tape, and before tightening, a control voltage is applied to obtain a tightening force according to the object to be packed, so that the control The voltage is not limited to the voltage required to pull out the tape from the tape reel, but can simply be the voltage required to tighten the packaged object. Therefore, a friction plate type electromagnetic clutch is used. Even when applied, the variable range of transmission torque can be widened according to the control voltage, and it is possible to easily and reliably pack items that are fragile, easily deformed, etc. and require a weak tightening force less than the tape feeding force. I can do it.

Furthermore, if a clutch with good characteristics such as an electromagnetic powder clutch is used, it can be varied over a wider range.

Further, in each of the above-mentioned embodiments, a case has been described in which one electromagnetic clutch is used and the applied voltage is changed, but as shown in FIG. A pulley 41 forming an armature of CL2 is rotatably arranged around a shaft 42, and rotors Rl and R2 having excitation coils fixed to the shaft 42 are arranged opposite to the armature. If the configuration uses two electromagnetic clutches, a required setting voltage is applied to one clutch R1, a tightening control voltage is applied to the other clutch R2, and the clutch CLI
By operating the clutch CL2 in the sending section and the clutch CL2 in the tightening section, it is possible to obtain the same effects as in each of the embodiments described above.

Furthermore, as shown in FIG. 8, the present invention can of course be applied to a packaging machine having a feed roller 46 for feeding the tape and a tension roller 4T for tightening the tape.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of a semi-automatic packaging machine to which the present invention can be applied, Figs. 2 and 3 are plan views showing an example of its power transmission mechanism, and Figs. 4 to 6 are diagrams of an operating circuit. A connection circuit diagram showing one example; FIG. 1 is a plan view showing another example of the power transmission mechanism;
FIG. 8 is a front view showing another example of the automatic packaging machine. 5 is a tape transport mechanism, 8 is a tape reel, 9 is a packing tape, MO, Ml, M2 are motors, 28, 35, CLI,
CL2 is an electromagnetic clutch, and 83 to S5 are detection switches.

Claims (1)

[Claims] 1. Tape tightening in a semi-automatic packing machine that does not have a packing tape guide arch and manually inserts the tip of the tape into a sealer unit, and feeds out and tightens the tape using a tape transport mechanism that is rotationally driven via an electromagnetic clutch. A semi-automatic packing machine that performs tightening with a weak tightening force depending on the object to be packed by switching the voltage applied to the electromagnetic clutch to a control voltage that is lower than the sending set voltage for a time period from before the tape tightening starts to when the tape tightening is completed. Tape tensioning device in.