JP4600006B2 - Bag binding machine - Google Patents

Description

  The present invention relates to a bag binding machine, and more particularly, to a bag binding machine provided with a safety device with improved durability.

  For example, groceries such as fruits and vegetables are often sold in a small packaging form in which a bag mouth and a bag neck are bound in a plastic bag or a net bag. This type of bag binding machine includes one using an adhesive tape as a binding material, one using a metal clip, one using a plastic binding tool, and the like, which are properly used depending on the nature of the food product. In addition to binding, some have a function of cutting off a surplus portion of the bound bag mouth and finishing it nicely.

  For example, the bag binding machine described in Patent Document 1 is a binding mechanism that binds a bag as a binding mechanism by hooking a plastic gate-shaped binding tool to the mouth of the bag and overlapping and crimping a pair of leg portions of the binding tool. And a cutter mechanism that cuts off the excess portion of the bag mouth portion at a predetermined length from the binding tool mounting portion during binding.

  5 and 6 are plan views of the bag binding machine provided with the cutter mechanism, and the binding mechanism 3 for binding the bags is disposed under the table unit 2 of the bag binding machine 1. FIG. A guide groove 4 is provided on the front side (lower side in the figure) of the table portion 2, and when the operator grasps the mouth portion of the bag and inserts it into the back of the guide groove 4, the gate lever 5 is pushed. Then, an activation switch (not shown) is turned on, the bundling mechanism unit 3 is activated, and the bundling tool is attached to the bag mouth.

  The cutter mechanism unit 6 is disposed on the back side (upper side in the drawing) of the bundling mechanism unit 3 and is rotatable in the horizontal direction. The cutter mechanism unit 6 includes a crank mechanism and a cutter blade for reciprocating the cutter blade. . The cutter mechanism 6 can be rotated between the retracted position of FIG. 5 and the use position of FIG. 6, and if it is not necessary to cut the excess portion of the bag, it is fixed at the retracted position and cuts the excess portion of the bag. In this case, the front guide groove 7 is rotated from the retracted position to the front use position, and the front guide groove 7 is aligned with the guide groove 4 of the table portion 2 and fixed. As a result, when the bag mouth portion is inserted into the back of the guide grooves 4 and 7, the binding mechanism portion 3 attaches the binding tool to the bag mouth, and the cutter in the cutter mechanism portion 6 is driven forward to bind the bag. The upper surplus portion of the bag is cut at a predetermined height from the device mounting site. At that time, a series of bundling operations is completed by performing crimping caulking by overlapping a pair of legs of the binding tool by a crimping caulking mechanism (not shown).

  For safety, the cutter mechanism 6 has a lock mechanism that is fixed at the retracted position and the use position, and a drive motor that is activated when the cover is not fixed at the retracted position or the use position and when the top cover is removed. A safety switch mechanism is provided. FIG. 7 shows a state in which the upper surface cover 8 of the cutter mechanism unit 6 is removed. FIG. 8 shows the arm unit 9 of the cutter mechanism unit 6, and the cutter blade 11 is loaded in the cutter holder 10 of the arm unit 9.

  A lock lever 12 that can be turned up and down is provided on the side surface of the arm unit 9.As shown in FIG. 7, the table unit 2 of the bag binding machine 1 has a retracted position and a use position of the cutter mechanism unit 6. Thus, slits 13 and 14 into which the front portion of the lock lever 12 is fitted are formed. If the tab 12a at the rear end of the lock lever 12 is pushed down to raise the front, and the engagement between the front and the slit 13 or slit 14 is released, the cutter mechanism 6 can be rotated in the horizontal direction. When the lock lever 12 is fitted into the slit 13 or the slit 14 at the retracted position or the use position, the cutter mechanism 6 is fixed at that position.

  As shown in FIG. 8, the arm portion 9 of the cutter mechanism portion 6 is pushed by the upper surface cover 8 by attaching the micro switch 15 that is turned on and off by the rear end portion of the lock lever 12 and the upper surface cover 8. The two micro switches 15 and 16 are connected to a control board (not shown) by a lead wire w as shown in FIG. The circuit is configured.

  Therefore, if the top cover 8 is removed from the cutter mechanism 6 when replacing the cutter blade, the microswitch 16 on the pivot fulcrum side of the lock lever 12 is turned off, so that the start switch (not shown) is turned on accidentally. However, the motor that drives the bundling mechanism unit 3 and the cutter mechanism unit 6 does not start. In addition, when the cutter mechanism 6 is not fixed at the retracted position or the use position, the tip of the lock lever 12 is raised on the table 2, so that the micro switch attached to the middle of the arm 9 No. 15 is turned off when the pressing by the rear end of the lock lever 10 is released, and the motor does not start even when the start switch is turned on.

In this way, if the top cover 8 is correctly attached to the cutter mechanism 6 and the cutter mechanism 6 is not fixed at the retracted position or the use position, the motor will not start even if the start switch is turned on. In this way, accidents due to incorrect operations are prevented.
Japanese Unexamined Patent Publication No. 2001-130515 (paragraph numbers 0009 and 0010)

  A safety device for a conventional bag binding machine includes a micro switch that detects that a top cover is attached to a cutter mechanism, and a micro switch that detects that the cutter mechanism is fixed at a retracted position or a use position. Are provided in the cutter mechanism, and these micro switches are connected to a circuit board in the main frame by a lead wire such as a vinyl wire.

  Therefore, since the lead wire is twisted when the cutter mechanism is rotated to switch to the retracted position or the use position, the lead wire may be broken in the long term. Moreover, when the upper surface cover is removed and the cutter blade is replaced, it may happen that the lead wire is touched by mistake and disconnected. Therefore, a technical problem to be solved arises in order to improve durability as a safety device and reduce the risk of failure, and the present invention aims to solve the above problem.

This invention is proposed in order to achieve the above object, and a binding mechanism unit that binds a bag mouth or bag neck of a packaging bag with a binding member;
A cutter mechanism section for cutting an excess portion of the bound packaging bag,
A drive motor that drives the bundling mechanism and the cutter mechanism by operating a start switch;
In the bag binding machine in which the cutter mechanism is provided so that it can be rotated at the use position and the retracted position and fixed at each position.
The cutter mechanism section is provided with a cutter holder that holds a cutter blade on an arm section that can be rotated with a crank shaft rotated by a drive motor and a reduction gear as a rotation fulcrum,
A hole is opened in the vicinity of the crankshaft of the table portion on which the cutter mechanism portion is mounted, and a magnetically sensitive switch provided in the hole ,
A detachable top cover that covers the cutter mechanism and rotates with the cutter mechanism;
A first magnet provided on the upper surface cover and facing the magnetically sensitive switch at the retracted position;
A second magnet provided on the top cover and facing the magnetically sensitive switch at the use position;
It is an object of the present invention to provide a bag binding machine comprising an activation control circuit or activation control means for activating the drive motor when both the magnetically sensitive switch and the activation switch are activated.

  The bag binding machine according to the present invention includes a first and a second magnet provided on a detachable upper surface cover of a cutter mechanism that can be rotated to a use position and a retracted position and fixed at each position, and a bag binding A safety device that controls the start of the drive motor by detecting the position state of the cutter mechanism is configured with a magnetically sensitive switch such as a Hall IC provided on the machine body side. Unlike the conventional bag binding machine configuration that connects the circuit on the main body with lead wires, the possibility of disconnection of wiring due to switching the cutter mechanism between the retracted position and use position is eliminated, and durability and reliability Improves. Moreover, since there is no wiring in the cutter mechanism, workability during maintenance such as replacement of the cutter blade is good.

  In addition, since the position of the cutter mechanism and the detection of the top cover can be detected with a single magnetically sensitive switch, a conventional safety device that uses micro switches for the position detection of the cutter mechanism and the detection of the attachment of the top cover, respectively. Further, the number of parts is reduced and the cost is also reduced.

  The present invention is a bag binding machine capable of rotating a cutter mechanism section for cutting excess portions of a bundled packaging bag to a use position and a retracted position and fixing the cutter mechanism section at each position, and mounting the cutter mechanism section. When the cutter mechanism is fixed at the retracted position by being provided on the magnetic sensitive switch provided on the table and the detachable top cover that covers the cutter mechanism and rotates together with the cutter mechanism. Both the first magnet facing the magnetic sensitive switch, the second magnet facing the magnetic sensitive switch when the cutter mechanism is fixed at the use position, and both the magnetic sensitive switch and the start switch are activated. By providing a start control circuit or start control means for starting the drive motor, the micro switch is provided in the cutter mechanism unit in the conventional configuration. To achieve the objective of eliminating the risk of broken lead wires for connecting the B switch and circuit board.

  FIG. 1 shows a bag binding machine 21. The overall shape and basic structure of the mechanism are the same as those of the conventional machine shown in FIGS. A bundling mechanism unit 23 is arranged, and a cutter mechanism unit 24 is arranged on the side of the bundling mechanism unit 23. It is configured so as to be inserted into the guide groove 25 on the side surface thereof for bundling.

  FIG. 1 shows a state in which the upper surface cover 26 is removed from the cutter mechanism portion 21, and replacement of the cutter blade 28 and other maintenance are performed with the upper surface cover 26 lifted and removed to expose the arm portion 27. Do. The arm unit 27 is provided with a cutter holder 30 that can horizontally rotate with a crankshaft 29 rotated by a drive motor and a reduction gear as a rotation fulcrum, and that holds the cutter blade 28 slidably. The cutter blade 28 attached to 30 is connected to the crankpin 29a of the crankshaft 29 via the link arm 31, and the cutter blade 28 reciprocates back and forth in the cutter holder 30 by rotating the crankshaft 29. . The crankshaft 29 and the cutter blade 28 are interlocked with the movement of the bundling mechanism 23, and following the binding tool pressurizing step, the crankshaft 29 makes one revolution and the cutter blade 28 moves forward and backward once and again from the bag bundling portion. Cut the bag at a predetermined height.

  An oblong hole 32 is opened near the crankshaft of the table portion 22, and a Hall IC 33 as a magnetically sensitive switch is disposed in the hole 32. The Hall IC 33 is connected to the control circuit. A 2-input AND circuit is configured together with a start switch (not shown).

  As shown in FIG. 2, a first magnet 34 and a second magnet 35 are embedded in the rear part of the top cover 26, and the two magnets 34 and 35 fix the cutter mechanism 24 to the retracted position. The crankshaft 29 is arranged on the circumference with the virtual axis as an imaginary center so as to be positioned immediately above the Hall IC 33 of the table portion 22 when it is fixed to the use position.

  FIG. 3 shows a state in which the cutter mechanism 24 fitted with the upper surface cover 26 is fixed to the retracted position. At this time, the first magnet 34 on the side surface of the upper surface cover 26 is positioned directly above the Hall IC 33. FIG. 4 shows a state in which the cutter mechanism 24 with the top cover 26 attached is moved to the use position and fixed. At this time, the second magnet 35 on the rear side of the top cover 26 is attached to the true position of the Hall IC 33. Located on the top. In these two states, since the first magnet 34 or the second magnet 35 is directly above the Hall IC 33, the output of the Hall IC 33 is turned on (Low), and the start switch is turned on. When the drive motor is activated to perform a one-cycle bundling operation and the cutter mechanism is fixed at the use position, the bag is cut by reciprocating driving of the cutter blade following the bundling operation. When the cutter mechanism is fixed at the retracted position, the cutter blade is driven back and forth following the bundling operation, but the bag is not cut because the cutter mechanism is retracted from the bag binding site. .

  On the other hand, when the cutter mechanism 24 is not fixed at the retracted position or the use position, the first magnet 34 or the second magnet 35 is detached from directly above the Hall IC 33 and the output of the Hall IC 33 is turned off (High ) And the motor will not start even if the start switch is turned on. Even when the cutter mechanism 24 is fixed at the retracted position or the use position, as shown in FIG. 1, when the top cover 26 is removed, the first magnet 34 or the second magnet 35 is removed from the Hall IC 33. By leaving, the output of the Hall IC 33 is turned off (High), and the motor does not start even if the start switch is turned on.

  The embodiment using the Hall IC as the magnetically sensitive switch has been described above. However, in addition to the Hall IC, a magnetoelectric conversion element such as a Hall element or a magnetoresistive element, or a reed switch may be used. In order to avoid a decrease in detection accuracy due to the influence and a complicated circuit configuration on the control circuit side, it is advantageous to use a single packaged Hall IC. The present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope of the present invention, and it is natural that the present invention extends to those modifications.

The perspective view of the front part of a bag binding machine which shows one Embodiment of this invention. FIG. 2 is a bottom perspective view of the top cover shown in FIG. The top view of the state which fixed the cutter mechanism part of the bag binding machine to the retracted position. The top view of the state which fixed the cutter mechanism part of the bag binding machine to the use position. The top view of the state which showed the prior art example and fixed the cutter mechanism part of the bag binding machine to the retracted position. The top view of the state which showed the prior art example and fixed the cutter mechanism part of the bag binding machine to the use position. The perspective view of the front part of a bag binding machine which shows a prior art example. The perspective view of the cutter mechanism part which showed the prior art example and removed the upper surface cover.

Explanation of symbols

21 Bag binding machine
22 Table section
23 Bundling mechanism
24 Cutter mechanism
25 Guide groove
26 Top cover
27 Arm
28 Cutter blade
29 Crankshaft
30 Cutter holder
31 Link arm
33 Hall IC
34 First magnet
35 Second magnet

Claims (1)

A bundling mechanism that binds the bag mouth or bag neck of the packaging bag with a bundling member;
A cutter mechanism section for cutting an excess portion of the bound packaging bag,
A drive motor that drives the bundling mechanism and the cutter mechanism by operating a start switch;
In the bag binding machine in which the cutter mechanism is provided so that it can be rotated at the use position and the retracted position and fixed at each position.
The cutter mechanism section is provided with a cutter holder that holds a cutter blade on an arm section that can be rotated with a crank shaft rotated by a drive motor and a reduction gear as a rotation fulcrum,
A hole is opened in the vicinity of the crankshaft of the table portion on which the cutter mechanism portion is mounted, and a magnetically sensitive switch provided in the hole ,
A detachable top cover that covers the cutter mechanism and rotates with the cutter mechanism;
A first magnet provided on the upper surface cover and facing the magnetically sensitive switch at the retracted position;
A second magnet provided on the top cover and facing the magnetically sensitive switch at the use position;
A bag binding machine comprising an activation control circuit or an activation control means for activating the drive motor when both the magnetically sensitive switch and the activation switch are activated.

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