JPH0826210A - Packing machine - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The transition from primary tightening to secondary tightening can be performed smoothly, and the band feed and back feed drive mechanisms can be configured simply and at low cost. Provide packing machine. [Structure] An output pulley 11 fixed to an output shaft 10a of a driving DC motor 10, a feed pulley 22 for integrally rotating a feed roller 52, and a back feed pulley 21 for integrally rotating a back feed roller 51 are provided over the outer circumference. The timing belt 12 is wound around, and one of the feed pressing roller 54 and the back feed pressing roller 53 is rotated by the timing belt 1.
The inner side of 2 and the other side are selectively pressed against and separated from the feed roller 52 and the back feed roller 51 from the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing machine adapted to wind a tape-shaped band made of a thermoplastic resin such as polypropylene around an article to be packed and to weld and bind the polymerized portion.

[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 rotationally driven and a feed pressing roller which is pressed against the band. Then, the band was wound around the outer peripheral surface of the object to be packed, and the excess feed was sandwiched between a back feed roller and a pressing roller pressed against the back feed roller to perform a primary tightening to pull back with high speed and low torque. A packing machine adapted to perform secondary tightening which is to be tightened firmly at low speed and high torque is well known.

In such a packing machine, when the band is sent out, the feed roller and the feed pressing roller are brought into pressure contact with each other, the back feed roller and the back feed pressing roller are brought into a separated state, and when the band is pulled back. Also, at the time of tightening, it is necessary to bring the pair of feed rollers into a separated state and to bring the pair of back feed rollers into a pressure contact state.

As described above, in the method of selectively pressing and separating the pair of rollers at a predetermined timing according to the work mode such as feeding out, pulling back and tightening of the band, conventionally, a high speed motor and a low speed motor are used. Two motors, a motor, are provided, and primary tightening and secondary tightening are performed by switching and using dedicated motors for high speed and low speed by drive transmission means such as an electromagnetic clutch, a friction clutch, and a speed reducer. Things are known.

[0005]

In the conventional packing machine as described above, there is a problem that slippage occurs in each of the above parts when the primary tightening shifts to the secondary tightening, and the number of parts increases and the number of constituent parts increases. However, it is difficult to lay out the vehicle and maintenance work such as maintenance and inspection of the electromagnetic clutch and the friction clutch is troublesome.

The present invention has been made in view of the above problems, and an object thereof is to improve the work efficiency by enabling a smooth transition from the primary tightening to the secondary tightening. In addition, 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. It is to provide a packing machine that can do this.

[0007]

In order to achieve the above object, a packing machine according to the present invention basically uses a driving force from a driving DC motor to draw a band around an object to be packed. After being sent by sandwiching it between a feed roller that is driven to rotate and sends out the band and a feed pressing roller that is pressed into contact with the band, the surplus amount to be sent is wound around the outer peripheral surface of the object to be packed. It is designed to be sandwiched between a back-feed roller that is driven to rotate and a back-feed pressing roller that is pressed against it, and to perform primary tightening that pulls back at high speed and low torque, and then to tighten tightly at low speed and high torque. In this packaging machine, the output pulley fixed to the output shaft of the driving DC motor and the feed roller are integrally rotated. And a back feed pulley that integrally rotates the back feed roller, a timing belt is wound around the outer circumference, and one of the feed pressing roller and the back feed pressing roller is the timing belt. From the inside, the other is selectively brought into pressure contact with and separated from the feed roller and the back feed roller from the outside.

More specifically, an eccentric shaft is fixed at a position eccentric to the feed pressing roller and the back feed pressing roller, and the base end of the swing arm is fixed to the eccentric shaft. A swinging end of the swinging arm is connected to an actuating rod of a solenoid actuator, and a linear movement of the actuating rod is converted into a pivoting movement of the eccentric shaft via the swinging arm, whereby the feed movement is performed. The pressing roller and the backfeed pressing roller are configured so as to be selectively brought into pressure contact with and separated from the feed roller and the backfeed roller, and further, the backfeed pressing roller is provided with the backfeed. Said solenoy which is pressed 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]

[Operation] 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, and first the feed pressing roller is fed to the feed roller. The oscillating arm is oscillated by the operation of the solenoid actuator that presses it against the eccentric shaft, and the eccentric shaft rotates by a predetermined angle, and the feed pressure roller is pressed against the feed roller with the band sandwiched between the feed roller and the feed roller. Is done. Next, separate the feed pressing roller from the feed roller, and drive D
While the rotation direction of the C motor remains the same, the eccentric shaft rotates by a predetermined angle by the swing arm that swings by the operation of the solenoid actuator that presses the back feed pressing roller against the back feed roller, and the back feed is performed. The pressure roller for press is pressed against the back feed roller with the band sandwiched between them to perform the primary tightening.Next, by further strengthening the suction force of the solenoid actuator, the pressure roller for back feed moves to the back feed roller. The secondary tightening is performed by pressing with a stronger force. In this way, the direction of band feed and back feed can be easily switched by simply pressing and pressing the pressing roller while keeping the rotation direction of one driving DC motor constant. Moreover, by changing the speed of the drive DC motor and the attraction force of the drive solenoid, it is possible to quickly and easily switch between the primary tightening and the secondary tightening.

[0010]

1 and 2 are a schematic configuration plan view and a front view 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 the drawings is basically In the same manner as the conventional one, the gate-shaped arch portion 5 for band guide is provided on the box-shaped main body housing 3 having the work table 4 on which the article to be packed W is placed.
A reel housing R for housing a reel unit (not shown) having a band coil loaded therein is provided, and
A band processing mechanism for feeding, tightening, welding, cutting and the like of the band delivered from the reel unit is arranged between the reel housing R and the work table 4.

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

More specifically, referring to FIGS. 3 and 4, the backfeed rotary shaft 16 and the feed rotary shaft 17 are composed of the drive DC motor 10 and the band end processing unit. A roller support housing 15 in the shape of a frame arranged between the upper and lower ends of the roller support housing 15 is rotatably provided above and below the roller support housing 15 in parallel with the output shaft 10a of the motor 10. The back feed pulley 21 is fixed to one end side (input side).

Further, in the roller support housing 15, a back feed pressing roller 53 and a feed pressing roller 54 are respectively provided with a back feed roller pressure contact mechanism 61 and a feed roller pressure contact mechanism 62 which will be described later.
Thus, the back feed roller 51 and the feed roller 52 are selectively pressed against and separated from each other (described in detail later).

On the other hand, the rotational driving force of the cam motor 30 is driven by the pulley 32 fixed to its output shaft 30a (FIG. 2).
It is transmitted to the pulley 46 provided on the input side of the 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 brake. Camshaft 90 of the band end processing unit 80 via 48
(FIG. 2), and thereby, the front grip 81, the rear grip 82, the press 84, the slide table 85, the slide guide 86 provided in the band end processing unit 80, a heater, etc. (not shown) In this type of packing machine, a well-known movable member is made to operate at a predetermined timing. The electromagnetic clutch 47 and the electromagnetic brake 48 are driven alternatively, and 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 is turned on.
When the electromagnetic brake 48 is ON in the FF, the above operation is held at the stop position.

In addition to the overall structure as described above, in the present embodiment, the backfeed roller press-contact mechanism 61 and the feed roller press-contact mechanism 62 attached to the roller support housing 15 are used for the backfeed. The pressing roller 53 for feeding and the pressing roller 54 for feeding are selectively brought into pressure contact with and separated from obliquely 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 shown in FIG.
And as shown in FIG. 4, each individual support member 5
5A and 56A are rotatably supported by support shafts 55 and 56 fixed to the two support members 55A and 56A.
A position eccentric with respect to the pressing rollers 53, 54,
More specifically, the rotation axes X and Y are provided at positions eccentric to the rotation axes P and Q of the pressing rollers 53 and 54.
The eccentric shafts 57 and 58, both ends of which are rotatably supported by the roller support housing 15, are respectively fixed to one end portions thereof. The eccentric shafts 57 and 58 are attached to the swing arms 67 and 58, respectively.
The base end of 68 is fixed, and both swing arms 6
Elongated holes 67a formed at the swinging ends of 7, 68,
68a has a pin 65 inserted through the operating rods 63a, 64a of the solenoid type actuators 63, 64,
66 are loosely inserted, and the operating rod 63
The vertical linear movement of a and 64a causes the swing arm 6 to move.
7, 68 through the eccentric shaft 57,
58 is converted into a rotational movement of the timing belt 12.
On the outer side of the feed roller 55
Inside the timing belt 12, are the back feed roller 51 and the feed roller 52, respectively.
Are selectively pressed against and separated from each other.

More specifically, the solenoid type actuators 63 and 64 are configured so that when the built-in solenoids thereof are not energized and energized (OFF),
The actuating rods 63a and 64a are largely projected outward by the urging force of the springs incorporated therein, as indicated by the alternate long and short dash line in FIG. Therefore, at this time, the swinging arms 67 and 68 also take the positions as shown by the one-dot chain line in FIG. 4, and accordingly, the pressing rollers 53 and 54 as shown by the one-dot chain line in FIG. 51, a position separated from the feed roller 52.

On the other hand, when the built-in solenoid is energized and energized (ON), the operating rod 63a resists the biasing force of the built-in spring as shown by the solid line (or broken line) in FIG. , 64a are pulled inward. Therefore, at this time, the swing arms 67 and 68 are positioned as shown by the solid line (or broken line) in FIG. 4, and accordingly, the eccentric shaft 5 is moved.
7, 58 rotate from the OFF position by a predetermined angle, the supporting members 55A, 56A swing, and the pressing rollers 53, 54 are back-feed roller 51, feed roller as shown by the solid line in FIG. It is pressed against 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 is unlikely to slip. Therefore, the back feed roller 51 and the back feed pressing roller 53 are
Band B between the feed roller 52 and the feed pressing roller 54, and the back feed roller pressure contact mechanism 61 and the feed roller pressure contact mechanism 62 are selectively operated as described later. By operating the band B, it is possible to accurately feed (feed) and pull back (tighten) the band B at any timing without causing slippage.

In the packing machine 1 of the present embodiment having the above-mentioned structure, when the article W to be packed is packed in the band B, the power of the control device 5 is turned on and the automatic insert (the tip of the band B is turned on). Part is automatically fed from the reel unit to the position where it passes the feed roller 52), the drive DC motor 10 is started and its output rotation shaft 10a is rotated in the forward direction in the high speed mode. , The solenoid type actuator 64 of the feed roller pressure contact mechanism 62 is activated (ON)
Be punished.

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. The feed roller 52 rotates in the forward direction (feed direction). At this time, the operating rod 64a of the solenoid actuator 64 is pulled inward, and the swing arm 68 swings from the position shown by the alternate long and short dash line in FIG. 4 to the position shown by the broken line, and the eccentric shaft accordingly. 58 and support 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 roller pressure contact mechanism 61 for the back feed roller is in the 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 then is guided to the arch 5 of the gate shape so as to circulate around the object W to be packed and the band end processing is performed. The feed is sent between the slide guide 86 and the slide table 85 of the unit 80, and is detected by a proximity switch (not shown) for detecting the completion of feed, which is arranged at the tip end when viewed in the feed direction of the band B of the slide guide 86. It will be sent to the position.

At this time, the rear end side of the band B passes through a gap formed between the back feed roller 51 and the back feed pressing roller 53 which is not in pressure contact with each other, and the guide surface 59a of the guide member 59 and the like. Is guided by the slide guide 86 and the press 84 of the band edge processing unit 80.
And it is sent out so as to pass through between the rear grip 82 and the rear grip 82.

Then, by the proximity switch, the band B
When the leading end of the feed roller is detected, the drive DC motor 10 is temporarily stopped and the solenoid actuator 64 of the feed roller pressure contact mechanism 62 is turned off.
Be put in a 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 alternate long and short dash line in FIG. 4). Then, after that, the cam motor 30 is started at a predetermined timing, and the electromagnetic clutch 47 is turned on and the electromagnetic brake 48 is turned off, so that the rotational driving force of the cam motor 30 becomes V. It 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 tip portion of the band B is held.

When it is detected that the tip portion of the band B is held by, for example, an ON operation of a limit switch (not shown) for confirming the work operation origin provided in association with the camshaft 90, The drive DC motor 10 is restarted so that its output rotary shaft 10a is again rotated in the same direction as in the band delivery in the high speed mode, and the solenoid actuator 63 of the back feed roller pressing mechanism 61 is operated (ON). ) It is confused.

As a result, similarly to the above, 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 actuating rod 63a of the solenoid type actuator 63 is pulled inward to move the swing arm 67. In FIG. 4, the eccentric shaft 57 and the support member 55A swing by a predetermined angle (clockwise in FIG. 4) by swinging from the position indicated by the alternate long and short dash line to the position indicated 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-mentioned operation, the excess feed amount of the band B is pulled back with high speed and low torque while being sandwiched between the back feed roller 51 and the back feed pressing roller 53 which is pressed against the back feed roller 51, and the primary tightening is performed. Is done. Then, as will be described later, secondary tightening in which the tightening is performed at low speed and high torque is performed following the primary tightening.

FIG. 5 is a control block diagram of the drive DC motor 10. Constant voltage AC power source 41 (eg AC10
AC power from 0 V is converted into DC power having a predetermined value by the rectifier circuit 43 via the TRIAC 42 (for example, DC80).
V), and is supplied to the driving DC motor 10. The drive DC motor 10 is provided with a tacho-generator, and the comparator 44 includes a current supplied to the drive DC motor 10 detected by a current measuring circuit 45 and a rotary shaft 16 of the back feed roller 51. The signal (TG IN) from the tacho-generator of the driving DC motor 10 corresponding to the rotation speed is input and calculation is performed, and the output rotation shaft 10a of the driving DC motor 10 is rotated by a speed switch (SPEED-SW). The speed is automatically switched between two stages of high speed H and low speed L. The band B is on the high-speed output H side when the band B is sent out and at the time of primary tightening (see FIG. 5), and the band B is fed at high speed and low torque and then tightened at high speed and low torque. In addition,
The output from the comparator 44 is a phase shifter 46 and a driver 47.
It is designed to be fed back to the TRIAC via.

The band B causes the object W to be packed by the primary tightening.
When the tension applied to the band B is suddenly increased by coming into contact with the outer peripheral surface of the belt and pulling back the surplus output, the load applied to the drive DC motor 10 is increased, and
The rotation speed of the rotary shaft 16 of the back feed roller 51, which was driven by the driving DC motor 10, is rapidly reduced. Then, when the rotation speed of the rotary shaft 16 becomes equal to or lower than a predetermined value, a signal for instructing to complete the primary tightening and shift to the secondary tightening is given by the comparator 4
4 is output (SPEED OUT), the speed switch (SPEED-SW) is automatically switched to the low speed L side, and the drive DC motor 10 is switched to the low speed and high torque mode. The operating rod 63a of the solenoid actuator 63 of the press contact mechanism 61 is pulled inward more strongly than in 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 by force and secondary tightening is performed with low speed and high torque.

After the secondary tightening is performed in this way, in the band end processing unit 80, the rear grip 82 holds the rear end of the band B, and the front end of the band B by the heater and the rear end. Heating and melting of the polymerized portion with the end portion, press-fitting of the melted polymerized portion by the press 84.
The cooling and cutting of the rear end of the band B are performed in a known manner and procedure, whereby the article W to be packed is packed by the band B. 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 design changes can be made without departing from the present invention described in the claims. be able to.

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

[0032]

As can be understood from the above description, the packing machine of the present invention can smoothly perform the transition from the primary tightening to the secondary tightening, and can improve the working efficiency, and The drive mechanism for the band feed and the back feed can be simple and inexpensive, 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 drawings]

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

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

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

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

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

[Explanation of symbols]

 10 ... Drive DC motor 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 pressing roller 54 ... Feed pressing roller 57 ... Eccentric shaft 58 ... Eccentric shaft 63 ... Solenoid type actuator 63a ... Actuating rod 64 ... Solenoid type actuator 64a ... Actuating rod 67 ... Swing arm 68 ... Swing arm W ... Package B ... Band

Claims (3)

[Claims] 1. A feed roller 52 which is rotationally driven by a driving force from a driving DC motor 10 to send the band B around the article W to be packed and a feed roller 52 which is pressed against the feed roller 52. After being sandwiched between the pressing roller 54 and the feeding roller 54, the band B is wound around the outer peripheral surface of the article W to be wound, and the excessive feed amount is driven to rotate and the back feed roller 51 is pressed against the back feed roller 51. Pressing roller 53
In a packing machine configured to perform a secondary tightening in which a first tightening process is performed by sandwiching it between and and a high speed low torque and then a strong tightening process is performed at a low speed and a high torque, the packing machine is fixed to the output shaft 10a of the drive DC motor 10. Output pulley 11, a feed pulley 22 that integrally rotates the feed roller 52, and a back feed pulley 21 that integrally rotates the back feed roller 51.
The timing belt 12 is wound around the outer periphery of the feed roller 52, and one of the feed pressing roller 54 and the back feed pressing roller 53 is from the inside of the timing belt 12 and the other is from the outside thereof. And the back feed roller 51
A packing machine characterized by being selectively pressed against and separated from. 2. 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, and the swing arm 6 is attached to the eccentric shafts 58 and 57.
The base ends of the rocking arms 68 and 67 are fixed, and the rocking ends of the rocking arms 68 and 67 are fixed to the solenoid actuator 6.
3, 64 operating rods 63a, 64a are connected, and the linear movement of the operating rods 63a, 64a causes the swing arm 6 to move.
8, 67 through the eccentric shaft 58,
It is converted into a rotational movement of 57, whereby the feed pressing roller 54 and the back feed pressing roller 5 are converted.
3. The packing machine according to claim 1, wherein the feed roller 52 and the back feed roller 51 are selectively pressed against and separated from each other. 3. The back feed pressing roller 53.
The primary tightening and the secondary tightening are switched by increasing / decreasing the magnitude of the force with which the operating rod 63a of the solenoid type actuator 63 that presses against the back feed roller 51. The packing machine according to claim 2.