JPH08337206A - Packing machine - Google Patents

Abstract

PURPOSE: To quickly and easily detect a working origin by fixing a magnet on a front clamp cam of a band end processing mechanism and also by placing a plurality of magnetic sensors oppositely on a rotation orbit of the magnet. CONSTITUTION: When an object is packed, a band end processing mechanism K is driven and a disk 50 integral with a front clamp cam 35 rotates, thereby also rotating a permanent magnet 51. When the permanent magnet 51 passes by two Hall ICs 53, 54, the Hall ICs 53, 54 simultaneously detect magnetic force of a certain value or more and are switched ON for outputting signals to an AND gate, whereby the signals are output from the AND gate and input to a CPU. The signal to the CPU indicates that the band end processing mechanism K is positioned at a working origin, where the CPU outputs a new signal to drive to rotate a stepping motor of a band feed and tightening mechanism, and a band B is fed out as a first process for a packing operation of a next object to be packed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing machine that automatically winds a tape-shaped band around an article to be packed and bonds the overlapped portions by welding and bonding, and in particular, each successive packing operation. Origin detecting device for detecting the origin of operation at the start of packaging of the product.

[0002]

2. Description of the Related Art Conventionally, in order to draw a band around an article to be packed placed on a work table by a band feeding and tightening mechanism, the band is clamped between a pair of rollers driven by a motor or the like, and then the band is fed. Wrap the band around the outer peripheral surface of the object to be packed, and after performing the primary tightening that pulls back the excess of the wound band with the pair of rollers at high speed and low torque, then pull back the band at low speed and high torque and firmly tighten the secondary tightening. On the other hand, by the band edge processing mechanism consisting of a cam mechanism driven by another motor,
A heater or the like provided in the mechanism heats and melts the overlapping portion of the front end portion and the rear end portion of the band, press-bonds the melted portion with a press, cools and joins, and cuts the rear end of the band. Packing machines designed to do so are well known.

The motor for driving the band delivery tightening mechanism and the band end processing mechanism of these conventional packing machines is, for example, a stepping device that can control the rotation speed and the moving amount quickly and accurately as much as the number of pulses. A motor is used, and the two stepping motors that drive the band feeding tightening mechanism and the band end processing mechanism are connected to a control device including a CPU, and selected separately based on a command from the control device. It is configured to be accurately driven to accurately perform the packing operation.

In an automatic packing machine for continuously packing a large number of objects to be packed, after confirming that the packing operation of one object to be packed is completed, the packing operation of the next object to be packed is performed. Therefore, it is automatically controlled by the control device. That is, one packing operation is performed by driving the stepping motor of the band edge processing mechanism to press the polymerized and melted portion of the band for a predetermined time to cool and release the pressing, and then the whole packing operation period. In the middle, move the slide table that is held on the same horizontal surface as the upper surface of the work table and remove the slide table from between the object to be packed and the band. Therefore, the stepping motor of the band end processing mechanism is continuously driven so that the band end processing mechanism such as the slide table is in the state of the starting point of the packing work (the slide table advances to the work table upper surface side, the front clamp is Completely complete by returning to the state that was held immediately before ascending, the operating origin).

The present applicant has previously proposed an operating origin returning device including an operating origin detecting means for accurately returning the band edge processing mechanism to the operating origin (Japanese Patent Application No. 5-249444). ). In the proposed operation origin returning device, an operation origin detecting cam that also serves as a slide cam is arranged in the band end processing mechanism, and the operation origin detecting cam is rotated in accordance with the rotation of the stepping motor to perform the operation. Place a limit switch that turns on when the origin detection cam reaches a specific angle position near the end of packing work before reaching the operation origin, and turns off at the specific angle position after passing the operation origin, and the limit switch turns on. The pulse counter counts the number of pulses generated from the separately provided timing pulse generating means from the time of turning off to the time of turning off. The intermediate point between both OFF positions is regarded as the operation origin, and the operation origin is detected.

Then, the band edge processing mechanism drives the stepping motor in reverse rotation based on the detection result of the operation origin, and from the position where the rotation advances once until the limit switch is turned off to the assumed operation origin. ,
The working origin is positioned by returning the working origin detecting cam.

[0007]

By the way, the operating origin returning device of the proposed packing machine must be provided with a cam for detecting the operating origin and a limit switch that is mechanically turned on and off by the movement of the cam. There is, and the ON
-Since it is necessary to provide an operating position adjusting means for accurately positioning the operating position for OFF operation, it requires a large number of parts and operates by mechanical movement in a limited space. There has been a problem that a space for arranging the limit switches has to be secured and a large space for arranging is required.

Further, since the proposed operating origin returning device detects the operating origin by regarding the intermediate point between the ON and OFF positions of the limit switch as the operating origin, the operating origin is detected. In addition, the operation origin detection cam is rotated beyond the operation origin, and then the operation origin detection cam that has been rotated once beyond the operation origin is reversely rotated by the stepping motor of the band end processing mechanism. It is necessary to drive and return to the deemed operation origin, and for that purpose, time for forward / reverse rotation driving of the stepping motor, that is, time for returning to the operation origin is required.

The time for returning to the operation origin as described above is, so to speak, a time between the previous packing work and the next packing work that does not substantially enter the packing process, and the length of the time is short. Therefore, in the automatic packing machine, how to shorten the time is also a problem for achieving the speeding up of the continuous packing work, because the working time of the entire continuous packing work is affected.

The present invention has been made in view of the above problems, and an object thereof is to easily and easily detect an operation origin in a packing machine that automatically and continuously carries out packing work. It is an object of the present invention to provide a packing machine that can be quickly carried out, and that the band edge processing mechanism can be accurately and quickly returned to the operation origin, thereby achieving high-speed continuous packing work.

[0011]

[Means for Solving the Problems] To achieve the above object,
A packing machine according to the present invention includes a band edge processing mechanism having a plurality of cams and a motor that rotationally drives the cams, and the band edge processing mechanism further detects an operation origin point for detecting the operation origin point of packing start. In addition to the above, the operation origin detecting device is characterized by including a magnet and a plurality of magnetic sensors that detect the magnetic force of the magnet.

As a more specific configuration, the magnet of the operation origin detecting device is fixed to the front clamp cam of the band end processing mechanism, and the plurality of magnetic sensors are spaced apart from each other. It is characterized in that they are arranged at opposite positions on the rotation locus of. Further, as a detection control mechanism of the operation origin detecting device, each of the two Hall ICs is connected to an AND gate, and
When the magnetic forces detected by the plurality of magnetic sensors are switched on at a predetermined value or more, a signal is output to the AND gate, and the AND gate outputs a signal based on overlapping output signals from the plurality of magnetic sensors. The feature is to detect the operation origin of the packing start.

[0013]

[Operation] The packing machine according to the present invention configured as described above can be moved from between the object to be packed and the band by swinging motion based on the rotation of the stepping motor used as the motor of the band end processing mechanism, for example. By pulling out the slide table, one packing operation of the objects to be packed is completed. Then, in order to start the next packing operation, the stepping motor of the band end processing mechanism is continuously driven to move the slide table to a position substantially horizontal with the surface of the work table by a swinging motion. A series of operations are performed to operate and return the front clamp to the state (operation origin) immediately before rising.

During the series of operations, the working origin detecting device detects the working origin. That is, since the front clamp cam is rotated to bring the front clamp into a state immediately before rising, the magnet of the operation origin detecting device is rotationally moved to the vicinity of the two Hall ICs as magnetic sensors, and the two of the two are detected. The Hall IC is ready to detect the magnetic force of the magnet. Further, the magnets rotate to approach the two Hall ICs, and the two Hall ICs simultaneously detect a magnetic force of a predetermined value or more, whereby the two Hall I's are detected.
When C switches on and each of the two Hall ICs outputs a signal to the AND gate, the CP is output from the AND gate.
A signal is output to U.

Since the signal to the CPU indicates that the band edge processing mechanism is located at the operation origin, the CPU is based on the signal to perform the next packing operation. A signal for driving the stepping motor of the band delivery tightening mechanism to rotate is output. The band B is delivered by the operation of the band delivery tightening mechanism.

Thereafter, the packing machine carries out the packing work by rotationally driving the stepping motors of the band end processing mechanism and the band feeding and tightening mechanism in response to the command signals sequentially output from the CPU. In the packing machine of the present invention, the operating origin detecting device comprises a rotating magnet and a plurality of Hall ICs spaced apart from each other, and switches when each of the Hall ICs detects a magnetic force of a certain value or more. Since the operating origin is the position when the Hall IC is turned on and the Hall ICs are simultaneously switched on, the stepping motor of the band end processing mechanism can be easily and normally rotated while rotating toward the operating origin. The operation origin can be accurately confirmed, and the step of reversely driving the stepping motor to return the band end processing mechanism to the operation origin is not necessary.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic front view of the packing machine 10 of this embodiment, showing an automatic example. The packing machine 10 includes a box-shaped main body housing 13 having a work table 14 on which the machine W to be packed is mounted, and a band guide arch portion 15 provided on the main body housing 13.
A band reel 16 loaded with C is stored and supported. Casters 19, 19, ... Are attached to the four corners of the bottom surface of the main body housing 13 so that the entire packing machine 10 can be easily moved.

The band reel 16 has a drum 17 loaded with the band coil BC, a reel shaft 16a for rotatably supporting the drum 17, and a band reel mounting member having one end of the reel shaft 16a fixed. 18 and a band reel brake device 11 arranged between the band reel mounting member 18 and the drum 17. Between the band reel 16 and the work table 14,
A band filling / pool mechanism L including a pool feed roller 21, a pressing roller 22, a band guide 23, and a pool chamber 24, and a stepping motor M ₂ for feeding and tightening the band B supplied from the band filling / pool mechanism L. And a band feeding and tightening mechanism S driven by the same, and a superposed portion of the leading end and the rear end of the fed and tightened band B is heated by a heater or the like, and the melted portion is pressure-bonded by a press or the like and cooled. A band end processing mechanism K driven by a stepping motor M ₁ which is joined and cuts the rear end of the band B.
A binding mechanism consisting of and is arranged.

FIG. 2 is a detailed view of the band edge processing mechanism K. The driving force from the stepping motor M ₁ for driving the cam of the band edge processing mechanism K is reduced by the speed reducer 30 and the rolling bearing 31a. Camshaft 32 supported by
To be transmitted to. The camshaft 32
Is spanned between the left and right side plates 33a and 33b of the support frame 33, and is pivotally supported by the rolling bearing 31b on the right side plate 33b.

The heater cam 3 is attached to the cam shaft 32.
4, the front clamp cam 35, the press cam 36, the slide cam 37, the rear clamp cam 38, and the middle slide cam 39 are fitted and fixed by the fixing key 40. Each of the cams 34 to 39 has a circular plate-shaped spacer 41 inserted through the cam shaft 32 coaxially with the cams 34 to 39 in a gap formed between the cams adjacent to each other. The cams 34 to 39 and the spacer 41.
Are fastened together by fastening bolts 42, 42.

Left and right side plates 33a of the support frame 33,
A front clamp 43 that moves up and down following the rotation of the front clamp cam 35 is disposed between the portions 33b, and the front clamp 43 includes a spring fitting insertion portion 43a having a gate-shaped cross section, An elongated plate-shaped arm portion (not shown) integrally formed with the spring fitting portion 43a and pivotally supporting the base end portion.
And a head portion 43b integrally formed on the upper part of the spring fitting portion 43a. Further, a guide hole 43f for guiding when the band B is supplied is formed in the head portion 43b.

A cam roller support shaft 43c extending parallel to the arm portion is attached to the spring fitting insertion portion 43a, and a spring member 43g having a cushioning action is provided above the cam roller support shaft 43c. A cam roller 43d which is fitted and inserted and which moves up and down following the front clamp cam 35 is sandwiched at the lower part thereof.

The press 44 and the rear clamp 45, which are arranged in a row with the front clamp 43, have the same arrangement as the front clamp 43, and follow the press cam 36 and the rear clamp cam 38, respectively. And cam rollers 44d and 45d that move up and down (details of the configuration are omitted). A cutter blade 44e for cutting a band is integrally fixed to the upper end portion of the press 44.

A slide table 46, a middle slide member 47, and a heater member (not shown) are provided near the upper end portion between the left and right side plates 33a and 33b.
The lower pivot shaft (not shown) arranged in parallel with the shaft 2 is swingably arranged. The slide table 4
6, the middle slide member 47, and the heater member respectively include the slide cam 37 and the middle slide cam 3.
9 and each of the heater cams 34 are arranged to be swung.

Next, the operating origin detecting device T of the band edge processing mechanism K will be described. The band edge processing mechanism K
A disk body 50 made of a non-magnetic material is integrally fixed to the side surface of the front clamp cam 35, and one circular permanent magnet 51 is embedded in the outer peripheral side surface of the disk body 50. . At a position facing the outer peripheral side surface of the disc body 50,
A Hall IC support plate 52 is arranged, and the Hall IC support plate 52 is fixed to a support frame 56 of the packing machine 10 with a fixing screw 55.
It is fixed at. As shown in FIG. 3, on the Hall IC support plate 52, two Hall ICs 53 for magnetic force detection, which oppose the permanent magnet 51 and are spaced apart from each other, are arranged on the rotation locus of the permanent magnet 51. , 54 are attached and fixed as magnetic sensors.

The two Hall ICs 53 and 54 are driven by the band end processing mechanism K and the front clamp cam 3 is driven.
The permanent magnet 51 also rotates when the disk body 50 that is integrated with the rotary body 5 rotates, and the permanent magnet 51 is rotated by the permanent magnet 51.
The magnetic force of the permanent magnet 51 is detected when passing through the vicinity of the C53, 54, and the Hall ICs 53, 5
4 is closer to the rotating permanent magnet 51,
When the magnetic force to be detected becomes higher than a predetermined value, the switch is turned on to output a signal, and when the permanent magnet 51 is further rotated and the distance becomes longer and the detected magnetic force becomes lower than a constant value, the signal is output when the switch is turned off. It works to stop.

As described above, the two Hall ICs 53 and 54 are arranged at a predetermined interval on the rotation locus of the permanent magnet 51, and the hole ICs are set so that the intermediate position of the interval becomes the operation origin. It is attached and fixed to the IC support plate 52 by being divided into right and left with respect to the operation origin position. Therefore, the two Hall ICs 53, 54 differ in the timing of detecting the magnetic force of the rotating permanent magnet 51 and outputting a signal.
Are arranged at appropriate intervals so that there are positions (periods) at which the magnetic forces of more than a predetermined value are redundantly detected and signals are simultaneously output.

Then, the two Hall ICs 53, 54
The two Hall ICs 5 simultaneously output signals.
It can be adjusted by changing the mounting and fixing positions of 3, 54, and the timing (position) at which the signals are output at the same time indicates the operation origin of the band edge processing mechanism K. By adjusting the timing at which the two Hall ICs 53 and 54 output signals at the same time at the origin, the operating origin can have an appropriate width (angle range). The rotation angle of the cam 35 is preferably within a range of ± 1.0 °.

FIG. 4 shows a part of the control circuit C of the packing machine 10 of this embodiment, particularly the control circuit part of the operating origin detecting device T. The two Hall ICs 53 and 54 of the operation origin detection device T are connected to an AND gate 57, and the front clamp cam 35 of the band end processing mechanism K is connected.
When the rotating body 50 integrally attached and fixed to the rotating body rotates, the permanent magnet 51 embedded in the rotating body 50 is rotated.
Rotates to approach the two Hall ICs 53, 54, and when each of the two Hall ICs 53, 54 detects a magnetic force above a certain value, each of the Hall ICs 53, 54 turns on and the AND gate 57 Output a signal to. The AND gate 57 outputs a signal to the CPU (computer) only when a signal is input from both of the two Hall ICs 53 and 54. The output signal from the AND gate 57 to the CPU becomes a signal indicating that each member of the band edge processing mechanism K is located at the operation origin.

Then, one output signal from the CPU is input to the solid state relay SSR of the band sending and tightening mechanism S, and the solid state relay SSR.
Controls the phase of the AC voltage based on the input signal and supplies it to the solenoid actuator 26 as an AC voltage having a specific duty ratio to change the pressing force between the pair of rollers of the band delivery tightening mechanism S. The other output signal from the CPU is a signal for driving the stepping motor M ₁ of the band edge processing mechanism K, and is a pulse oscillator P ₁
By operating the driver D ₁ via
The other output signal from the CPU is the band sending tightening mechanism S.
Drive signal to the stepping motor M ₂ and is performed by operating the driver D ₂ via the pulse generator P ₂ .

Next, the operation of the packing machine 10 of this embodiment constructed as described above will be described. The packing work of one object W to be packed progresses, and the melt-bonding of the polymerized portion of the band B is performed, that is, the melt-polymerized portion of the band B is strongly pressed by the press 44 to cool the polymerized portion for a predetermined time. After that, the stepping motor M ₁ of the band edge processing mechanism K rotates to lower the press 44.

After that, the slide table 46, which is held at a position substantially on the same horizontal plane as the surface of the work table 14 during the entire process of packing one article W to be packed.
Is oscillated based on the rotation of the stepping motor M ₁ to remove it from between the article to be packaged W and the band B, whereby the packing work of one article to be packaged W is practically completed.

Then, in order to start the next packing work,
The stepping motor M ₁ of the band edge processing mechanism K is continuously driven to actuate the slide table 46 again to move to a position substantially horizontal with the surface of the work table 14 by a swinging motion. The front clamp 43 is operated to return to the state (operation origin) immediately before rising.

In the process of the operation stroke, the detection by the operation origin detecting device T is performed. That is, in the process, the permanent magnet 51 of the operation origin detecting device T is rotationally moved to the vicinity of the two Hall ICs 53 and 54, and the two Hall ICs 53 and 54 detect the magnetic force of the permanent magnet 51. It is ready. When the two Hall ICs 53 and 54 simultaneously detect a magnetic force of a certain value or more and switch on to output a signal to the AND gate 57, a signal is output from the AND gate 57 and C
Input to PU.

The signal to the CPU indicates that the band edge processing mechanism K is located at the operation origin, and the CPU outputs a signal based on the signal from the AND gate 57. Then, the stepping motor M ₂ of the band delivery tightening mechanism S is rotationally driven, and the band B is delivered as the first step of the next packing operation of the articles W to be packaged.

After that, the stepping motors M ₁ and M ₂ of the band end processing mechanism K and the band feeding and tightening mechanism S are rotationally driven by the output signal sequentially output from the CPU to carry out the packing work. As described above, the packaging machine 10 according to the embodiment of the present invention has the Hall ICs 53 and 5 that are spaced apart from the permanent magnet 51 that rotates the operating origin detection device T by two.
4 and the two Hall ICs 53, 54 turn on the switch only when they simultaneously detect the magnetic force of a certain value or more, and the position at this time is set as the operation origin. While the stepping motor M ₁ is rotating in the forward direction toward the operation origin, the operation origin can be easily detected, and the stepping motor M ₁ is reversely driven to return the band end processing mechanism K to the operation origin. It doesn't need a process such as.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment,
Various modifications can be made in the design without departing from the spirit of the invention described in the claims. For example, in the present embodiment, the permanent magnet of the operation origin detecting device is arranged on the side surface of the front clamp cam, but it goes without saying that it may be arranged on another cam.

[0038]

As can be understood from the above description, since the packaging machine according to the present invention uses the non-contact detecting member (Hall IC) and the non-detecting member (permanent magnet), it can be used like a limit switch. Detection without contact chattering is possible. Also, by using a magnet with a strong magnetic force, it is possible to perform accurate detection without variation, and it is possible to reduce the width of the operating origin by adjusting the strong magnetic force and the spacing between multiple Hall ICs, thus ensuring an accurate operating origin. Can be set.

Furthermore, since the Hall IC can be attached and fixed to the frame of the packing machine below the band edge processing mechanism, it can be easily attached and detached or adjusted from the outside. Furthermore, since the operating origin detection device can be arranged by utilizing the space between the cams of the band end processing mechanism,
There is no need to provide a special arrangement space such as lengthening the camshaft of the band end processing mechanism.

[Brief description of drawings]

FIG. 1 is a schematic front view of a packing machine according to an embodiment of the present invention with a front side wall removed to show an internal configuration thereof.

2 is an enlarged cross-sectional view of a band edge processing mechanism of the packing machine shown in FIG.

FIG. 3 is a schematic perspective view of an operating origin detection device of the packing machine shown in FIG.

FIG. 4 is a diagram showing a control circuit of the packing machine of FIG. 1.

[Explanation of symbols]

10 ... packing machine 35 ... front clamping cams 51 ... the permanent magnets 53 ... Hall IC 54 ... Hall IC 57 ... AND gate K ... band edge processing mechanism M ₁ ... stepping motor T ... operating point detection device

Claims (3)

[Claims] _1. A band end processing mechanism K having cams 34 to 39 and a motor M ₁ for rotationally driving the cams 34 to 39.
In the packing machine 10 including the above, the band edge processing mechanism K includes an operation origin detection device T that detects an operation origin at the start of packing, and the operation origin detection device T
Is provided with a magnet 51 and a plurality of magnetic sensors 53 and 54 that detect the magnetic force of the magnet 51. 2. The magnet 51 of the operating origin detecting device T.
Is fixed to the front clamp cam 35 of the band end processing mechanism K, and the plurality of magnetic sensors 53 and 54 are arranged at opposite positions on the rotation locus of the magnet 51 at intervals. The packing machine according to claim 1. 3. Each of the plurality of magnetic sensors 53, 54 of the operation origin detecting device T is connected to an AND gate 57, and switches on when a detected magnetic force is a predetermined value or more and outputs a signal to the AND gate 57. The AND gate 57 detects the operation origin of the packing start by outputting signals based on the overlapping output signals from the plurality of magnetic sensors 53 and 54. Packing machine described.