JPH0740918A - Packing apparatus - Google Patents

Abstract

PURPOSE:To prevent a band from being wound around a slide table or the like due to unnecessary winding, thereby suppressing wearing of the slide table or the like and to make an inexpensive apparatus as a whole. CONSTITUTION:A packing apparatus for feeding and back-feeding a band B to be wound around an outer periphery of an object to be packed comprises a stepping motor M2 for feeding/back-feeding which is a driving source for feeding and back-feeding the band B, wherein back-feeding is completed when a length for back-feeding the band B reaches a predetermined value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing machine, and in particular,
The present invention relates to a packing machine capable of automatically or semi-automatically performing a work of winding a tape-shaped band made of a thermoplastic resin such as polypropylene around a product to be packed and bonding the polymerized portion by welding.

[0002]

2. Description of the Related Art Generally, in order to improve the efficiency and labor saving of packing work, a tape-shaped band made of a thermoplastic resin is wound around an object to be packed, and the band is tightened. A packaging machine has been already put into practical use, which is capable of heating, melting, and pressure bonding, and automatically or semi-automatically performing the work up to cutting.

A full-automatic type in which a band guide arch for arranging the band B around the object to be packed is provided on the upper part of the main body of the packing machine. A packing machine is known (for example, JP-A-1-
213107 and JP-A-62-146117), according to such an automatic packing machine, the band is guided by the band guide arch to be wound around the object to be packed, and the band is automatically wound. It is supposed to be set. On the other hand, the semi-automatic packing machine is one in which the tip of a band that is fed with a preset length is artificially set at a predetermined position on the lower surface of the work table.

[0004]

In the conventional packing machine as described above, the band is tightened (backfeed) due to an erroneous operation or the like, even though the object to be packed is not placed on the workbench. There are cases (hereinafter referred to as blank tightening). When the air-tightening is performed in this manner, the band is wrapped around the slide table or the like and tied up, which makes it impossible to carry out the next packing operation. For this reason, an elongated notch (or groove) is formed by using milling or the like at the part around which the band such as a slide table is wrapped, and when the empty tightening is performed, the knife is cut at the notch part each time. Had to be used to cut the bound band.

As described above, in the conventional packing machine, not only the number of processes such as milling a slide table and the like is large, but also the manufacturing cost and the human cost are high. There are problems that it is easily worn and that the work efficiency is reduced due to the work of cutting off the binding band. The present invention has been made in view of such a problem, and an object thereof is to prevent binding of a band such as a slide table due to air-tightening, thereby improving work efficiency. At the same time, it is possible to prevent wear of the slide table and the like, and moreover,
An object of the present invention is to provide a packing machine which can be constructed at a low cost.

[0006]

In order to achieve the above-mentioned object, the packing machine according to the present invention performs the work of feeding a band which can be wound around the outer periphery of the article to be packed and back feeding. In the packaging machine described above, a stepping motor for feed / backfeed, which is a drive source for feeding and backfeeding the band, is provided, and means for ending the backfeed when the length for backfeeding the band reaches a predetermined value. It is characterized by having.

[0007]

[Operation] In the packing machine according to the present invention configured as described above, the band is first supplied (feed) by the driving force from the feed / back feed stepping motor, and the band is wound around the outer periphery of the object to be packed. After that, the band is tightened (back feed). At this time,
Back feeding is continuously performed while the amount of the band to be back fed is smaller than the predetermined value α. Then, when the predetermined value α is reached, it is recognized that the air-tightening has been performed, and further tightening of the band is not performed, and the backfeed operation ends.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a schematic plan view with a top plate removed to show the entire interior of a packaging machine according to an embodiment of the present invention, FIG. 2 is a schematic front view, and FIG. 3 is a schematic side view taken along the line III-III of FIG. is there. 1 to 3, the packing machine 1 of this illustrated example is mounted horizontally on the upper ends of the columns 3, 3, ... With the casters 2, 2 ,. A top plate 4 which is attached to the rack, and a side plate 5 which is attached to surround the four side surfaces,
A substantially box-shaped packing machine main body 10 is provided as a frame member, which is composed of an inspection port (not shown) and the like which is openably provided at an appropriate position on the side plate 5. Also, the above-mentioned columns 3, 3, ...
The top plate 4 is integrally formed of, for example, an extruded aluminum material.

A band reel 6 into which a band coil can be loaded is installed inside the packing machine main body 10 with its central axis 6a facing sideways. In addition, a plate-like support plate 11 extending horizontally in the horizontal direction is fixed to the upper part of the inside of the packing machine body 10 opposite to the side where the band reel 6 is installed (right side in FIGS. 1 and 2). And the support plate 11
A frame 12 having a substantially U-shaped horizontal cross section is mounted and fixed on the upper surface of the. Between the left and right side plates 12a and 12b of the frame 12, a band supply end processing means K (details will be described later), which is composed of various cams and arms for gripping, pressing, melting, and cutting the band B. Is provided. Also, the left side plate 12a of the frame 12
The cam driving stepping motor M ₁ with a speed reducer 7 for driving the band supply end processing means K is provided on the outer surface of the
Are arranged in rows, and on the outer side of the right side plate 12b,
Band feeding / tightening (feed / backfeed) means F including a feed / backfeed stepping motor M ₂ , which can be rotated in the forward and reverse directions, a feed / backfeed roller 8, a rocker roller 9, and the like is provided in parallel and fixed.

Next, details of the packing machine 1 of the illustrated example will be described. 4 is an enlarged view of a main part of FIG. 2, and FIG. 5 is an enlarged view of a main part of FIG. First, the band supply end processing means K will be described. The cam driving stepping motor M ₁
The driving force from is reduced by the speed reducer 7 and transmitted to the cam shaft 14 which is axially supported by the rolling bearing 13. The camshaft 14 is laid across both side plates 12a and 12b of the frame 12,
A roller bearing 15 is pivotally supported on the right side plate 12b.

As shown in FIG. 4, the heater cam 21, the front clamp cam 22, the press cam 23, the slide cam 24,
The rear clamp cam 25 and the middle slide cam 26 are fitted in the cam shaft 14 and fixed by the key 16. Each of the cams 21 to 26 is
It is formed by stacking two plate members of the same shape punched into a predetermined cam shape by a press. Then, in the gap formed between the cams 21 to 26 adjacent to each other, a circular shape made of plastic or the like that is inserted into the cam shaft 14 concentrically with the cams 21 to 26. The plate material spacers 17, 17, ... Are interposed, and the spacers 17, 17, ..
1 to 26 are fixed together by bolts 18, 18.

A front clamp 40 is arranged between the left and right side plates 12a and 12b to move up and down by following the rotation of the front clamp cam 22. The front clamp 40 is integrally formed with the spring fitting insertion portion 41 having a gate-shaped cross section, and can be rotatably locked to a pivot shaft 42 at the base end portion. Notch ring portion 43a
And a head portion 45 fixed to the upper part of the spring fitting insertion portion 41 with a bolt or the like. This front clamp 40
Is molded from a press-molded shape member such as aluminum, and a guide hole 44 for guiding when supplying the band is formed in the head portion 45.

On the inner side surfaces of the left and right leg portions of the gate-shaped cross section of the spring fitting portion 41, the spring fitting inserting portion 41 extends laterally (rightward in FIG. 5) in parallel with the arm portion 43. A pressed steel cam roller support member 51,
51 is attached. The cam roller support member 51,
A spring member 46 having a cushioning effect is fitted and inserted in the upper portion of 51, and a cam roller 52 that swings following the front clamp cam 22 is sandwiched in the lower portion thereof. Then, the base end portion 5 of the cam roller support member 51 pivotally fixed to the arm portion 43 of the front clamp 40.
1a includes the cam roller 52 and the front clamp cam 2
A spring member 53, which urges the plate 2 to press, is interposed between the support plate 11 and the spring member 53.

Similarly, the press 55 and the rear clamp 56 have substantially the same structure as that of the front clamp 40, and cam rollers 57 and 58 swinging following the press cam 23 and the rear clamp cam 25, respectively. A cutter member 59 for cutting a band is integrally fixed to the upper end portion of the press 55.

Further, as shown in FIG. 5, the side plate 12 is
A heater member 61, a slide member 62, and a middle slide member 63 are swingably arranged near the upper end between a and 12b. The heater member 61 has a plate-shaped heater plate 64 positioned at the upper end portion, and a heater arm 65 fixed to the lower surface of the heater plate 64 and extending downward.
And the heater arm 65 includes the side plates 12a, 1
It is pivotally supported by a pivot shaft 30 spanning between 2b. The heater arm 65 is connected to the cam roller 7
It is attached so as to be capable of swinging in conjunction with the heater cam 21 via 1.

Similarly, the slide member 62 has a plate-like slide table 67 fixed to the upper end of a slide arm 66 pivotally supported by the pivot shaft 30. The slide arm 66 is swingably attached to the slide cam 24 via a cam roller 72. Further, the middle slide member 63 is arranged on the side opposite to the arrangement of the heater member 61 and the slide member 62 with respect to the pivot stop shaft 30. That is, the middle slide member 63 is configured by fixing the middle slide 74 to which the limit switch L is fixed to the upper end portion of the middle slide arm 73 pivotally supported by the pivot shaft 30. The middle slide arm 73 is swingably attached to the middle slide cam 26 via a cam roller 75. The heater member 6
1, the cam rollers 71, 72 and 75 are respectively attached to the heater cam 21, the slide cam 24 and the middle slide cam 26 at the lower end portions of the arms 65, 66 and 73 of the slide member 62 and the middle slide member 63. Spring members 76, 76, 76 for urging to press are interposed between the support plate 11 and the spring members.

Next, the band supply / tightening means F will be described. FIG. 6 is a vertical sectional view of the feed / back feed stepping motor M ₂ . The stepping motor M _{2 in the} illustrated example includes a motor body 81 and a gear case 83 integrally fixed to the motor body 81 on the protruding side of the output shaft 82. The gear case 8
3 through the rolling bearings 84 and 85 to the front (see FIG. 6).
A feed / back feed roller shaft 86 that is projected to the left) is pivotally supported. In the vicinity of the end of the feed / back feed roller shaft 86 inside the gear case 83, a feed / back feed roller rotating gear 88 that meshes with a tooth portion 87 engraved at the tip of the output shaft 82. On the other hand, the feed / back feed roller 8 is fixed on the outer end of the feed / back feed roller shaft 86. A mounting shaft 89 for fixing the band guide cover 98 mounted on the outer side of the front end portion of the feed / back feed roller 8 is fitted in the vicinity of the peripheral portion of the gear case 83 so as to project forward. There is. Then, the rocker roller 9 is constantly fed by the pressing means (not shown).
It is attached so as to be pressed against the back feed roller 8 (see FIG. 4).

As can be seen from FIG. 4, the band B wound around the band reel 6 is fed through the twist roller 92 and the idle roller 93.
After passing through the pressure contact portions of the back feed roller 8 and the rocker roller 9, the inside of the tubular band guide member 94, the guide hole 44 of the front clamp 40, the gap between the press 55 and the middle slide 74, the rear clamp 56. And a gap between the slide table 67 and the like, and the like, and the like, and the like, and the like, pass through the gap in order, and exit outside from the top plate 4. Next, the tip end portion of the band B, which is wound around the object to be packed in a loop shape (if a band arch is installed, passes through the inside to form a loop), the slide table 67 is attached. Is introduced into the inside of the packing machine 1 again through the band introduction port 95 formed on the side of the slide table 67, passes through the gap between the slide table 67 and the middle slide 74, contacts the limit switch L, and the setting is completed. Is configured.

Next, the operation of the packing machine according to the embodiment of the present invention thus constructed will be described. First, when a start switch of a control device (not shown) is operated to operate the feed / back feed stepping motor M ₂ , the feed / back feed roller 8 starts to rotate and feeds the band B to feed (supply). )
As described above, the band B is rotated around the object to be packed with a distance, and is brought into contact with the limit switch L to stop the feed / back feed stepping motor M ₂ and The setting of B is completed.

Next, the cam driving stepping motor M ₁ is activated to rotate the front clamp cam 22, and the cam roller 52, which is a follower thereof, is actuated so that the arm portion 43 moves around the pivot shaft 42. The front clamp 40 rises by swinging upwards, and the upper end surface of the front clamp 40 and the lower surface of the slide table 67 clamp (lock) the supply tip of the band B. At the same time, the cam driving stepping motor M ₁ is stopped, the feed / backfeed stepping motor M ₂ is started, and rotation is started in a tightening (backfeed) direction opposite to the supply (feed) direction. Primary tightening is performed by high speed and low torque drive. Then, the band B comes into contact with the outer peripheral surface of the article to be packed, and the tension of a predetermined value is applied to the band B.
, The feed / back feed stepping motor M ₂ is operated by a tension sensor (not shown).
The operation mode is automatically switched, and low-speed and high-torque driving is performed to perform secondary tightening. During the primary and secondary tightening periods, the operation of the cam driving stepping motor M ₁ is kept at the stop position.

Then, when the load tension of the band B due to the secondary tightening reaches the set upper limit value of the tension sensor, the cam driving stepping motor M ₁ is restarted. As a result, the rear clamp cam 25 operates and the rear clamp 56 rises. The rear portion of the overlapping portion of the band B is clamped by the upper surface of the rear clamp 56 and the lower surface of the slide table 67.

Next, the heater arm 65 and the middle slide arm 73 for supporting and fixing the heater plate 64 and the middle slide 74, which are attached to face each other in the width direction of the band B, are the heater cam 21 and the middle cam. Via the cam rollers 71 and 75, which are operated following the rotational movement of the middle slide cam 26,
Rotation is performed with the pivot shaft 30 as the center of rotation so as to advance and retreat in conjunction with each other. That is, the direction in which the middle slide 74 exits from the overlapping portion of the band B (rightward in FIG. 5).
At the same time, the heater plate 64 is also slid in the same direction (rightward in FIG. 5) (guided by the inner slide 74). In this way, the heater plate 64 is attached to the inner slide 7
4 (see FIG. 4), the band B is inserted into the gap between the overlapping portions of the band B which are vertically arranged at a distance from each other, and immediately after that, the press cam 23 and the cam roller 57 are inserted. Simultaneous pinching with the press 55, which is raised by operation, melts and presses the facing surface of the overlapping portion of the band B. Here, the press 55 is first lightly pressed by the overlapping portion of the band B, and then temporarily lowered. At the same time, the heater plate 64 is pulled out from the band overlapping portion (to the left side in FIG. 5), and subsequently,
The press 55 rises again and the cutter member 59 cuts the band B from the front clamp 40 side. Then, the press 55 is strongly pressed against the overlapped portion of the band B, and in that state, the band overlapped portion is cooled for a predetermined time (for example, 1 to 1.7 seconds), and the press 55 is lowered. The cam driving stepping motor M ₁ is held at the stop position during the first pressing operation of raising the press 55 and during the cooling period.

Finally, during the entire process, the slide table 67, which is held on the same horizontal surface as the top surface of the top plate 4, has the cam roller 72, which is a follower of the slide cam 24, and the slide table 67. Slide arm 66
And the like, and is rotated in the retreating direction (leftward in FIG. 5) about the pivot shaft 30 as the center of rotation. Next, FIGS.
Therefore, by using the packing machine of one embodiment of the present invention described above,
Actually, the operation will be described by comparing the case where the band is tightened on the object to be packed and the case where the band is tightened dry.

FIG. 7 is an operation explanatory view schematically showing a state in which the supply for feeding the band B around the object to be packed C is finished, and FIG. 8 is a state in which the primary tightening of the band B is finished. FIG. 7 is an operation explanatory view schematically showing. Also,
FIG. 9 is an operation explanatory diagram when the air-tightening is performed. Figure 7
As shown in FIG. 6, the band B is fed by a preset length l ₁ so that the band B is wound at an appropriate distance from the periphery of the article C to be packed (hereinafter, referred to as band. It is called a feed length, and the band B is the packing machine 1
The length from the top plate 4 to the outside is the length from the starting point to the feeding tip). The feed control of the band feed length l ₁ is performed by control means for controlling the acceleration / deceleration, stop, etc. of the feed / back feed stepping motor M ₂ , that is, a sequencer of a microcomputer (not shown) of a control device. Thus, the feed length l
_If the pulse signal (the number of pulses) corresponding to the preset length is set to ₁ , the band can be accurately fed by the feed / back feed stepping motor M ₂ to the preset length. .

Next, the primary tightening of the band B is performed (FIG. 8). At this time, if the length from the position where the band B is exposed to the outside of the packing machine 1 to the starting point (hereinafter referred to as the length at the time of back feed) is l ₂ , the band B is -Difference between the feed length l ₁ and the band back feed length l ₂ D (l ₁ -l ₂ ).
Primary tightening is performed by an amount equal to. That is, l ₁
The difference D between 1 and l ₂ corresponds to the length of the band B back-fed, and the larger this is, the tighter the object C to be packed is. Therefore, as shown in FIG. 9, when the air-tightening is performed, the band back-feed length l ₂ ′ becomes extremely small, and the difference D
Becomes larger and approximates the band feed length l ₁ .

[0026] Therefore, the packing machine according to the present invention, the difference in band feed length l ₁ and the band backfeed when the length l ₂ D (l ₁ over l ₂₎ is a predetermined value alpha (e.g.,
When it reaches 150 mm), it is automatically judged that the air-tightening has been performed, and the microcomputer as the control means issues a control signal to terminate the backfeed without performing further tightening. Then, as in the ordinary work, the band B is bound, and the loop of the band, which has been tightened in the air to form a small loop, can be easily used as it is without being tightly bound to the slide table or the like. It is removed and the packing operation continues without interruption.

As described above, in the packing machine according to the present invention, the stepping motor is used as a motor for feed / back feed, and the maximum amount of the band to be back-fed is set in advance. Is no longer tied to the slide table, etc. Therefore, the packing work is not interrupted for the work such as cutting and removing the tied band, improving work efficiency and suppressing wear of the slide table etc. can do. In addition, the stepping motor has both high-speed low-torque and low-speed high-torque functions as its speed-torque characteristics, and furthermore, starts, stops, reverses, accelerates, and decelerates by following the input signal completely. Therefore, it is suitable for a packing machine. Further, since the stepping motor does not need to perform the feedback control and the open loop control is performed, the control circuit configuration is simple. Therefore, the stepping motor itself has a simple configuration and is compact. Therefore, the whole can be configured easily and inexpensively.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various designs can be made without departing from the present invention described in the claims. You can make changes. For example, in the illustrated example, the stepping motor M ₁ is used as the cam driving motor, but it goes without saying that another motor such as an induction motor may be used.

[0029]

As can be understood from the above description, according to the present invention, it is possible to prevent the binding of the band such as the slide table due to the air-tightening, so that the working efficiency is improved and the slide is slid. Wear of the table and the like can be suppressed, and the entire structure can be constructed at low cost.

[Brief description of drawings]

FIG. 1 is a schematic plan view with a top plate removed to show the entire interior of a packing machine according to an embodiment of the present invention.

FIG. 2 is a schematic front view of the packing machine shown in FIG.

FIG. 3 is a schematic side view taken along the line III-III in FIG.

FIG. 4 is an enlarged view of a main part of FIG.

5 is an enlarged view of a main part of FIG.

FIG. 6 is a view showing a feed provided to the packing machine according to the embodiment of the present invention.
FIG. _{3 is} a vertical cross-sectional view of a backfeed stepping motor M ₂ .

FIG. 7 is an operation explanatory view schematically showing a state in which a band is fed to an object to be packed by using the packing machine according to the embodiment of the present invention.

FIG. 8 is an operation explanatory view schematically showing a state in which the primary tightening of the band is completed from the state of FIG.

FIG. 9 is an explanatory view of the operation when the air-tightening is performed using the packing machine according to the embodiment of the present invention.

[Explanation of symbols]

α Specified value (maximum backfeed amount of band B) B band C Object to be packed M ₂ feed stepper motor for backfeed

Claims (1)

[Claims] 1. A packing machine configured to perform a feed of a band B which is wound around an outer periphery of an object to be packed C, a back feed, and the like, and a drive source which performs the feed of the band B and the back feed. A packing machine comprising a certain feed / backfeed stepping motor M ₂ and means for ending the backfeed when the length D for backfeeding the band B reaches a predetermined value α.