JP3227061B2 - Packing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing machine for winding a tape-shaped band made of a thermoplastic resin such as polypropylene around an object to be packed, and welding and bundling a polymerized portion thereof.

[0002]

2. Description of the Related Art Conventionally, in order to draw a band around an object to be packed placed on a work table, the band is sandwiched between a feed roller which is driven to rotate and a feed holding roller which is pressed against the roller. Then, the band was wound around the outer peripheral surface of the article to be packed, and the excess amount of the band was sandwiched between a back feed roller and a press roller pressed against the back feed roller to perform primary tightening by pulling back at high speed and low torque. Packing machines adapted to perform a secondary tightening, which is subsequently tightened strongly at low speed and high torque, are well known.

[0003] In such a packing machine, when the band is fed, the feed roller and the feed pressing roller are brought into pressure contact with each other, and the back feed roller and the back feed pressing roller are separated from each other. At the time of tightening, it is necessary that the pair of feed rollers be separated from each other and the pair of back feed rollers be pressed.

As described above, a method of selectively pressing and separating a pair of rollers at a predetermined timing in accordance with a work form such as feeding, pulling back, tightening, and the like of a band has conventionally employed a high-speed motor and a low-speed motor. By providing two motors and switching between dedicated motors for high speed or low speed using drive transmission means such as an electromagnetic clutch, a friction clutch, and a reduction gear, primary tightening and secondary tightening are performed. Things are known.

[0005]

In the conventional packing machine as described above, there is a problem that slippage occurs in each of the above-mentioned parts when shifting from primary tightening to secondary tightening. However, there is a problem that the layout work is difficult and maintenance work such as maintenance and inspection of the electromagnetic clutch and the friction clutch is troublesome.

[0006] The present invention has been made in view of such a problem, and an object of the present invention is to improve the work efficiency by enabling a smooth transition from primary tightening to secondary tightening. In addition, a simple and inexpensive drive mechanism for the band feed and the back feed can be configured, the layout of the components is facilitated, and the maintenance work of the components is reduced as much as possible. It is to provide a packing machine which can be used.

[0007]

In order to achieve the above object,
The packing machine according to the present invention basically has a feed roller which is driven to rotate by a driving force from a driving DC motor and feeds the band, and presses the band with the feed roller in order to draw the band around the object to be packed. And a back feed roller for rotating the excess of the band to be wound around the outer peripheral surface of the article to be packaged and a back feed press roller for pressing the band against the same. In a packing machine which is configured to perform primary tightening, which is fastened at low speed and high torque, after performing primary tightening to be pulled back at high speed and low torque, the output fixed to the output shaft of the driving DC motor A pulley, a feed pulley that rotates the feed roller integrally, and a back feed roller that rotates integrally. A timing belt that does not slip over the outer periphery of the back feed pulley to be squeezed is wound, and one of the feed holding roller and the back feed holding roller is from the inside of the timing belt and the other is from the outside. The feed roller and the back feed roller are selectively pressed against and separated from each other.

More specifically, an eccentric shaft is fixed at a position eccentric with respect to the feed holding roller and the back feed holding roller, and the base end of the swing arm is fixed to the eccentric shaft. The oscillating end of the oscillating arm is connected to an operating rod of a solenoid-type actuator, and the linear motion of the operating rod is converted into a pivoting motion of the eccentric shaft via the oscillating arm, whereby the feeding for the feed is performed. A press roller and a back feed press roller are selectively pressed against and separated from the feed roller and the back feed roller, and further, the back feed press roller is connected to the back feed roller. The solenoid that presses against the roller It is mentioned as preferable specific examples that is characterized in that to perform the switching of the primary tightening and secondary tightening by increasing or decreasing the magnitude of the force the operating rod of formula actuator is aspirated.

[0009]

In the packing machine according to the present invention configured as described above, the rotational driving force of the driving DC motor is transmitted from the timing belt to the back feed roller and the feed roller. The swing arm swings by the operation of the solenoid type actuator that presses against the eccentric shaft, the eccentric shaft rotates by a predetermined angle, and the feed holding roller is pressed against the feed roller with the band interposed between them, and the band feed is performed. Is performed. Next, the feed holding roller is separated from the feed roller, and the driving D
The eccentric shaft is rotated by a predetermined angle by the swing arm that swings by the operation of the solenoid type actuator that presses the back feed press roller against the back feed roller while keeping the rotation direction of the C motor as it is. The primary presser roller is pressed against the back feed roller with the band in between, and the primary tightening is performed.Then, by further increasing the suction force of the solenoid actuator, the back feed retainer roller is attached to the back feed roller. Further tightening is performed with a stronger force to perform secondary tightening. In this way, the band feed and back feed directions can be easily switched simply by selectively pressing and separating the pressing roller while keeping the rotation direction of one drive DC motor always constant, In addition, by changing the speed of the drive DC motor and the suction force of the drive solenoid, switching between primary and secondary tightening can be performed quickly and easily.

[0010]

1 and 2 are a schematic plan view and a front view, respectively, showing a layout of a main part of an embodiment of a packing machine according to the present invention. The packing machine 1 shown in FIG. In the same manner as in the prior art, a gate-shaped arch portion 5 for guiding a band is provided on a box-shaped main housing 3 having a work table 4 on which an article to be packed W is placed,
A reel storage unit R for storing a reel unit (not shown) loaded with a band coil is provided therein.
A band processing mechanism is provided between the reel storage section R and the work table 4 for feeding, tightening, welding, cutting, and the like the band fed from the reel unit.

The band processing mechanism includes a driving DC motor 10 horizontally arranged at the right corner between the work table 4 and the partition member 9 (FIG. 2), and a horizontal DC motor at the left side of the partition member 9. And a band end processing unit 80 disposed just below a substantially central portion of the work table 4. The rotational driving force of the driving DC motor 10 is transmitted from an output pulley 11 fixed to the output shaft 10a to a back feed pulley 21 and a feed pulley 22 by an endless annular timing belt 12, and the driving force is further fed back. To the feed rotary shaft 16 and the back feed roller 51 fixed to one end thereof, and also to the feed rotary shaft 17 to which the feed pulley 22 is fixed and the feed roller 52 fixed to one end thereof. It has become so.

3 and 4, the back feed rotary shaft 16 and the feed rotary shaft 17 are composed of the drive DC motor 10 and the band end processing unit. 80, a frame-shaped roller support housing 15 disposed between the upper and lower sides of the frame-shaped roller support housing 15 rotatably and in parallel with the output shaft 10a of the motor 10; The back feed pulley 21 is fixed to one end (input side).

A back feed pressing roller 53 and a feed pressing roller 54 are respectively provided on the roller supporting housing 15 with a back feed roller pressing mechanism 61 and a feed roller pressing mechanism 62 described later.
Thus, it is arranged so as to be selectively pressed into contact with and separated from the back feed roller 51 and the feed roller 52 (described later in detail).

On the other hand, the rotational driving force of the cam motor 30 is controlled by a pulley 32 fixed to its output shaft 30a (FIG. 2).
Is transmitted to a pulley 46 provided on an input side of an electromagnetic clutch 47 disposed in the vicinity of the band end processing unit 80 by the endless annular V belt 34 wound around the electromagnetic clutch 47 and the electromagnetic clutch 47 and the electromagnetic brake. 48, the camshaft 90 of the band end processing unit 80
(FIG. 2), whereby the front grip 81, the rear grip 82, the press 84, the slide table 85, and the slide guide 86 provided in the band end processing unit 80, as well as a heater (not shown) However, in this type of packing machine, a well-known movable member is operated at a predetermined timing. The electromagnetic clutch 47 and the electromagnetic brake 48 are driven alternatively. When the electromagnetic clutch 47 is ON and the electromagnetic brake 48 is OFF, the band end processing unit 80 performs a predetermined operation, and the electromagnetic clutch 47
When the electromagnetic brake 48 is ON in the FF, the operation is held at the stop position.

In the present embodiment, in addition to the above-described overall configuration, in the present embodiment, the back feed roller pressing mechanism 61 and the feed roller pressing mechanism 62 attached to the roller support housing 15 are used. The pressing roller 53 for feeding and the pressing roller 54 for feeding are selectively pressed against and separated from the oblique lower portions of the back feed roller 51 and the feed roller 52, respectively.

That is, the back feed pressing roller 53 and the feed pressing roller 54 are formed as shown in FIG.
As shown in FIG. 4 and FIG.
The supporting members 55A, 56A are rotatably supported by supporting shafts 55, 56 fixed to 5A, 56A.
An eccentric position with respect to the pressing rollers 53, 54,
More specifically, the pressing rollers 53 and 54 have rotation axes X and Y at positions eccentric with respect to the rotation axes P and Q.
Both ends are fixed to end portions of eccentric shafts 57 and 58 rotatably supported at both ends by the roller support housing 15. And these eccentric shafts 57, 58 are attached to swing arms 67,
68 is fixed, and both swing arms 6
Elongated holes 67a, 67a,
A pin 65 inserted through the operating rod 63a, 64a of the solenoid type actuator 63, 64 through the pin 68,
66 are inserted freely, and the operating rod 63
a, 64a of the swing arm 6
7, eccentric shaft 57,
58, whereby the back feed hold down roller 54 is rotated by the timing belt 12.
Outside the feed roller 55 and the feed press roller 55
Are the inside of the timing belt 12 and the back feed roller 51 and the feed roller 52, respectively.
Are selectively pressed against and separated from.

More specifically, when the built-in solenoids are not energized and energized (OFF), the solenoid type actuators 63 and 64 are turned on.
The operating rods 63a and 64a are made to protrude largely outward as shown by the dashed line in FIG. 4 by the biasing force of the springs incorporated therein. Therefore, at this time, the swing arms 67 and 68 also assume the positions shown by the dashed lines in FIG. 4, and accordingly, the pressing rollers 53 and 54 move the back feed rollers as shown by the dashed lines in FIG. 51, a position separated from the feed roller 52;

On the other hand, when the built-in solenoid is energized (ON), as shown by a solid line (or broken line) in FIG. 4, the operating rod 63a is opposed to the biasing force of the built-in spring. , 64a inward. Therefore, at this time, the swing arms 67 and 68 take positions as shown by solid lines (or broken lines) in FIG.
7 and 58 rotate by a predetermined angle from the OFF position, the support members 55A and 56A swing, and the pressing rollers 53 and 54 are moved backward as shown by solid lines in FIG. 52.

The outer peripheral surfaces of the back feed roller 51 and the feed roller 52 are made of urethane rubber in which the band B hardly slips. Therefore, the back feed roller 51 and the back feed pressing roller 53
, And between the feed roller 52 and the feed holding roller 54, the band B is sandwiched, and the back feed roller pressing mechanism 61 and the feed roller pressing mechanism 62 are selectively provided as described later. By operating the band B, the band B can be precisely sent out (pulled) and pulled back (tightened) at any timing without causing slippage.

In the packing machine 1 of the present embodiment configured as described above, when packing the object to be packed W with the band B, the power supply of the control device 5 is turned on and the auto insert (the tip of the band B) is turned on. Is automatically sent out from the reel unit until the portion passes the feed roller 52), the driving DC motor 10 is started, and the output rotary shaft 10a is rotated in the forward direction in the high-speed mode, and Then, the solenoid type actuator 64 of the feed roller pressing mechanism 62 is operated (ON).
I'm sullen.

As a result, the rotational driving force of the driving DC motor 10 is transmitted from the timing belt 12 to the back feed roller 51 via the back feed pulley 21 and to the feed roller 52 via the feed pulley 22. Then, the feed roller 52 rotates in the forward direction (feed direction). At this time, the operating rod 64a of the solenoid type actuator 64 is retracted inward, and the swing arm 68 swings from the position shown by the one-dot chain line to the position shown by the broken line in FIG. 58 and the supporting member 56A rotate by a predetermined angle (counterclockwise direction in FIG. 4)
Then, the feed pressing roller 54 is pressed against the feed roller 52 with the band B interposed therebetween. At this time, the solenoid-type actuator 63 of the back-feed roller roller pressing mechanism 61 is in an OFF state, and the back-feed pressing roller 53 is separated from the back-feed roller 51.

By the above operation, the tip of the band B passes through the lower surface side of the work table 4 and is then guided around the gate-shaped arch portion 5 so as to go around the article to be packed W so that the band end processing is performed. It is sent between the slide guide 86 and the slide table 85 of the unit 80, and is detected by a feed completion detection proximity switch (not shown) disposed at the end of the slide guide 86 when viewed in the feeding direction of the band B of the slide guide 86. Is sent to the position where it is done.

At this time, the rear end side of the band B passes through a gap formed between the back feed roller 51 and the non-pressed back feed pressing roller 53, and guide surfaces 59a and the like of the guide member 59. Guide 84 and press 84 of band end processing unit 80 while being guided by
And it is sent out so as to pass through between the rear grip 82.

The band B is set by the proximity switch.
Is detected, the drive DC motor 10 is temporarily stopped, and the solenoid actuator 64 of the feed roller pressing mechanism 62 is turned off.
State. As a result, the band feeding is stopped, and the feed pressing roller 54 is returned to the original position (the position indicated by the one-dot chain line in FIG. 4). Thereafter, the cam motor 30 is started at a predetermined timing, the electromagnetic clutch 47 is turned on and the electromagnetic brake 48 is turned off, and the rotational driving force of the cam motor 30 is reduced to the V The power is transmitted to the camshaft 90 via the belt 34 and the electromagnetic clutch 47, whereby the front grip 81 of the band end processing unit 80 is raised, and the front end of the band B is held.

When the tip of the band B is detected as being held by, for example, an ON operation of a limit switch (not shown) for confirming a work operation origin provided in connection with the camshaft 90, The driving DC motor 10 is restarted, the output rotary shaft 10a is rotated again in the high-speed mode in the same direction as that at the time of the band sending, and the solenoid type actuator 63 of the back feed roller pressing mechanism 61 is operated (ON). )

As a result, the driving D
The rotational driving force of the C motor 10 is transmitted from the timing belt 12 to the back feed roller 51 via the back feed pulley 21, and the operating rod 63a of the solenoid type actuator 63 is pulled inward, so that the swing arm 67 is moved. 4, the eccentric shaft 57 and the supporting member 55A rotate by a predetermined angle (clockwise direction in FIG. 4) from the position shown by the one-dot chain line to the position shown by the solid line. The feed pressing roller 53 is pressed against the back feed roller 51 with the band B interposed therebetween.

By the above operation, the surplus of the band B is pulled back at a high speed and a low torque while being sandwiched between the back feed roller 51 and the back feed pressing roller 53 pressed against the back feed roller 51. Is performed. Then, as will be described later, secondary tightening, which is performed at low speed and high torque, is performed subsequent to the primary tightening.

FIG. 5 is a control block diagram of the driving DC motor 10. As shown in FIG. Constant voltage AC power supply 41 (for example, AC10
0V) is converted to a predetermined value of DC power by the rectifier circuit 43 via the TRIAC 42 (for example, DC80).
V), and is supplied to the driving DC motor 10. The driving DC motor 10 is provided with a tacho generator, and a comparator 44 detects the current supplied to the driving DC motor 10 detected by the current measuring circuit 45 and the rotation shaft 16 of the back feed roller 51. A signal (TG IN) from the tachogenerator of the drive DC motor 10 corresponding to the rotation speed is input to perform a calculation, and the rotation of the output rotary shaft 10a of the drive DC motor 10 is performed by a speed switch (SPEED-SW). The speed is automatically switched between high speed H and low speed L. When the band B is sent out and the primary tightening is performed, the high-speed output H is set (see FIG. 5). After the band B is fed at a high speed and a low torque, the band B is also tightened at a high speed and a low torque. In addition,
The output from the comparator 44 is a phase shifter 46, a driver 47
Is fed back to the TRIAC via the.

The band B is moved to the packing object W by the primary tightening.
When the surplus of the transmission is pulled back in contact with the outer peripheral surface of the band and the tension acting on the band B increases rapidly, the load acting on the driving DC motor 10 increases,
The rotation speed of the rotating shaft 16 of the back feed roller 51 driven by the driving DC motor 10 rapidly decreases. When the rotation speed of the rotating shaft 16 becomes equal to or less than a predetermined value, the signal for instructing the completion of the primary tightening and shifting to the secondary tightening is output from the comparator 4.
4 (SPEED OUT), the speed switch (SPEED-SW) is automatically switched to the low-speed L side, and the driving DC motor 10 is switched to the low-speed high-torque mode. The operating rod 63a of the solenoid-type actuator 63 of the press-contact mechanism 61 is pulled in more strongly than at the time of the above-described primary tightening, and the back-feed pressing roller 53 is stronger than the back-feed roller 51 with the band B interposed therebetween. It is pressed against by force and secondary tightening by low speed and high torque is performed.

After the secondary tightening has been performed in this manner, in the band end processing unit 80, the rear end of the band B is held by the rear grip 82 and the front end and the rear end of the band B are heated by the heater. Heat melting of the polymerized portion with the end, press-bonding of the melted polymerized portion by press 84
Cooling, cutting of the rear end of the band B, and the like are performed in a known manner and procedure, whereby the article to be packed W is packed by the band B. As mentioned above, although one Example of this invention was described in detail, this invention is not limited to the said Example, Various design changes are made without departing from this invention described in a claim. be able to.

For example, in the illustrated embodiment, the solenoid type actuators 63 and 64 are arranged on the same side (right side) of the eccentric shafts 57 and 58 when viewed in plan view in FIG. 3, but one of them is connected to the eccentric shaft. Of course, it may be arranged on the left side of 57, 58. Further, instead of the timing belt 12, a roller chain or the like can be used.

[0032]

As will be understood from the above description, the packing machine of the present invention can smoothly shift from the primary tightening to the secondary tightening, and can improve the work efficiency. The drive mechanism for the band feed and the back feed can be configured simply and inexpensively, the layout of the components can be facilitated, and the maintenance work of the components can be reduced as much as possible.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a layout of a main part of an embodiment of a packing machine according to the present invention.

FIG. 2 is a schematic front view showing a layout of a main part of the packing machine of the embodiment.

FIG. 3 is an enlarged plan view showing the periphery of a back feed roller of the packing machine according to the embodiment.

FIG. 4 is an enlarged front view showing the periphery of a back feed roller of the packing machine according to the embodiment.

FIG. 5 is a control block diagram of a driving DC motor according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... DC motor for drive 10a ... Output shaft 11 ... Output pulley 12 ... Timing belt 21 ... Back feed pulley 22 ... Feed pulley 51 ... Back feed roller 52 ... Feed roller 53 ... Back feed press roller 54 ... Feed press roller 57 ... Eccentric shaft 58 ... Eccentric shaft 63 ... Solenoid actuator 63a ... Working rod 64 ... Solenoid actuator 64a ... Working rod 67 ... Swing arm 68 ... Swing arm W ... Packed object B ... Band

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-131111 (JP, A) JP-A-64-84811 (JP, A) JP-A-6-99925 (JP, A) 105104 (JP, U) JP-A 61-24510 (JP, U) JP-A 5-54209 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65B 13/22

Claims (2)

(57) [Claims] A feed roller for rotating the band (B) around the article to be packed (W) by a driving force from a driving DC motor (10) and sending out the band (B). 52) and a feed press roller (54) pressed against it and fed out. Then, the band (B) is rotationally driven so as to wind the band (B) around the outer peripheral surface of the article to be packed (W). The primary tightening is performed between the back feed roller (51) to be pressed and the pressing roller (53) for back feed pressed against the same, and the secondary tightening is performed after the primary tightening is performed at a high speed and a low torque, and then the tightening is strongly performed at a low speed and a high torque. An output pulley (11) fixed to an output shaft (10a) of the driving DC motor (10); Feed pulley allowed to integrally rotate over La (52) (22)
And a timing belt (12) which does not slip over the outer periphery of a back feed pulley (21) for integrally rotating the back feed roller (51), and is wound around the feed press roller (54).
And one of the back feed pressing rollers (53) is selectively pressed against the feed roller (52) and the back feed roller (51) from the inside of the timing belt (12) and from the outside thereof. The eccentric shafts (58) and (57) are fixed at positions eccentric with respect to the feed pressing roller (54) and the back feed pressing roller (53).
The base ends of the swing arms (68) and (67) are fixed to the eccentric shafts (58) and (57), and the swing ends of the swing arms (68) and (67) are solenoid type. The actuators (63) and (64) are connected to operating rods (63a) and (64a), and the linear movement of the operating rods (63a) and (64a) is performed via the swing arms (68) and (67). The rotation is converted into the rotational movement of the eccentric shafts (58) and (57), whereby the feed press roller (54) and the back feed press roller (53) are turned into the feed roller (52) and the back feed roller (53). 51) A packing machine characterized in that it can be selectively pressed into contact with and separated from the packing machine. 2. A back feed press roller (53).
Between the primary tightening and the secondary tightening by increasing or decreasing the magnitude of the force with which the operating rod (63a) of the solenoid-type actuator (63) is pressed against the back feed roller (51). The packing machine according to claim 1, wherein: