JPH0711507U - Packing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] A pair of rollers can be immediately brought into pressure contact with or separated from each other at any time, and the pressure contact / separation timing can be freely set. (EN) Provided is a packaging machine which can be configured simply and inexpensively, and whose component parts can be easily laid out to obtain a large pressure contact force even with a small driving force. A roller 53 of a pair of rollers 51 and 53 is axially supported by a supporting member 55A, and an eccentric shaft 57 is fixed at a position eccentric to the roller 53 in the supporting member 55A. The base end portion of the swing lever 67 is fixed to the eccentric shaft 57, and the swing end portion of the swing lever 67 is connected to the operating rod 63a of the solenoid actuator 63 so that the linear motion of the operating rod 63a is the same as the above. It is converted into a rotational movement of the eccentric shaft 57 via a swing lever 67, whereby the one roller 53 is rotated.
Are selectively brought into pressure contact with and separated from the other roller 51.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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 object to be packed and to bond the polymerized portion by welding.

[0002]

[Prior art]

 Conventionally, in order to draw the band around the article to be packed placed on the work table, the band is sandwiched between a feed roller that is rotationally driven and a feed pressing roller that is pressed against the band, and then the band is sent out. , The band is wound around the outer peripheral surface of the object to be packed, and the excess feed is sandwiched between the back feed roller and the pressing roller that is pressed against the back feed roller and pulled back with high speed and low torque. It is well known that the packing machine is designed to carry out secondary tightening.

In such a packing machine, at the time of feeding the band, the feed roller and the pressing roller for the feed are brought into pressure contact with each other, and the backfeed roller and the pressing roller for the backfeed are kept apart from each other, while At the time of pulling back and 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, a method of selectively pressing and separating a pair of rollers at a predetermined timing according to a work form such as feeding, pulling back, and tightening of a band is conventionally known, for example, a base end. One roller is pivotally attached to the swing end of a swing lever whose part is pivotally supported, and the swing lever is cammed so that the one roller comes into pressure contact with and separates from the other roller. There is known one that is made to swing in the direction.

[0005]

However, in the case of using the cam and the rocking lever as described above (hereinafter referred to as the cam lever system), the press contact / separation timing is determined by the contour and rotational speed of the cam. , For example, in order to insert and remove the band end from between the rollers, it is necessary to stop the rotation while keeping an eye on when the cam is in a specific rotation position.At any time, immediately put a pair of rollers in a pressure contact state or in a separated state. In addition, there is a problem that it is difficult to change the pressure contact / separation timing that has been set once.In addition, the number of parts is large, and the layout of parts such as levers and cams is difficult. There is also a problem that a driving force is required.

In view of the above point, the present invention is designed such that a band is sandwiched between a pair of rollers, at least one of which is rotated and pressed against each other, so that the band is fed out, pulled back, and tightened. , A pair of rollers can be immediately put into pressure contact or separated at any time, and the pressure contact / separation timing can be set freely, and the roller pressure contact mechanism can be configured simply and at low cost. Moreover, it is an object of the present invention to provide a packaging machine in which the layout of its components is easy and a large pressure contact force can be obtained with a small driving force.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the packing machine according to the present invention basically has a band sandwiched between a pair of rollers, at least one of which is rotated and pressed against each other, to send out and pull back the band. One roller of the pair of rollers is pivotally supported by a supporting member while being tightened, and an eccentric shaft is fixed at a position on the supporting member that is eccentric to the roller. The base end of the rocking lever is fixed to the eccentric shaft, the rocking end of the rocking lever is connected to the actuation rod of the solenoid actuator, and the linear motion of the actuation rod is transmitted through the rocking lever. Is converted into rotational movement of the excentric shaft, whereby one of the rollers is selected with respect to the other. It is characterized in that manner is adapted to be brought into pressure contact and separation.

More specifically, in order to draw the band around the article to be packed placed on the work table, a feed roller that drives the band to rotate and a feed pressing roller that presses the band together. After being sandwiched and sent out, the band is sandwiched between a back feed roller, which is rotationally driven to rotate the excess portion of the band so as to be wound around the outer peripheral surface of the object to be packed, and a press roller, which is pressed against the band. At least one of the two pressing rollers is pivotally supported on the support member under the condition that the secondary tightening is performed by first tightening the torque and then tightening strongly at low speed and high torque. At the same time, the eccentric shaft is fixed to the support member at a position eccentric to the pressing roller. Is fixed to the eccentric shaft, and the base end of the rocking lever is fixed, and the rocking end of the rocking lever is connected to the operating rod of the solenoid actuator, and the linear movement of the operating rod is performed. Is converted into rotational movement of the excitonic shaft via the swing lever, whereby the pressing roller is selectively brought into pressure contact with and separated from the back feed roller. .

[0009]

[Work]

 In the packing machine according to the present invention configured as described above, when the solenoid type actuator is actuated, its actuation rod is pulled in or projected. The linear movement of the working rod is converted into the rotational movement of the eccentric shaft via the swing lever. When the eccentric shaft rotates, one roller having a rotation axis at a position eccentric to the rotation axis swings about the rotation axis of the eccentric shaft. As a result, the one roller is brought into pressure contact with or separated from the other roller.

As described above, in the packing machine of the present invention, the pair of rollers can be pressed and separated by electrically turning on and off the solenoid actuator, so that the pair of rollers are immediately pressed and contacted at any time. It is possible to set the pressure contact / separation timing as well as to set the pressure contact / separation timing freely. In addition, the roller pressure contact mechanism can be assembled simply by connecting in series the solenoid actuator, swing lever, eccentric shaft, roller support member, etc., which are inexpensive and easily available, so the layout of the components is easy. At the same time, the overall structure is simple and can be manufactured at low cost.

Further, the driving force of the solenoid type actuator is expanded by the “lever principle” according to the ratio of the eccentric amount (distance between the rotation axes) between the eccentric shaft and the roller to the length of the swing lever. Therefore, even a small solenoid type actuator can obtain a sufficient pressure contact force.

[0012]

【Example】

 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 a conventional packing machine. Similarly to the above, a box-shaped main body housing 3 having a work table 4 on which an article W to be packed is placed is provided with a gate-shaped arch portion 5 for band guide, and a band coil is provided in the main body housing 3. A reel housing R for housing a reel unit (not shown) loaded with is provided, and the band delivered from the reel unit is fed, tightened, and welded between the reel housing R and the work table 4. A band processing mechanism for joining and cutting is provided.

This band processing mechanism includes a high-speed feed motor 10 horizontally arranged in the right corner between the work table 4 and the partition member 9 (FIG. 2), and the lower left side of the partition member 9. The cam motor 30 is arranged horizontally in the section, and the band end processing unit 80 is arranged just below the center of the work table 4. The rotational driving force of the high-speed feed motor 10 is transmitted from the pulley 11 fixed to the output shaft 10a thereof to the back feed pulley 21 and the feed pulley 22 by the endless annular V belt 12, and the driving force is further transmitted to the back feed pulley 21 and the feed pulley 22. The rotary shaft 16 for feed is transmitted from the pulley 21 through the friction clutch 25 to the rotary shaft 16 for back feed and the back feed roller 51 fixed to one end thereof, and the rotary shaft 17 for feed to which the feed pulley 22 is fixed and one end thereof. It is also transmitted to the feed roller 52 fixed to the.

More specifically, referring to FIGS. 3 and 4, the backfeed rotary shaft 16 and the feed rotary shaft 17 include the high-speed feed motor 10 and the band end. A frame-shaped roller support housing 15 arranged between the processing unit 80 and the frame-shaped roller support housing 15 is rotatably provided above and below and parallel to the output shaft 10a of the motor 10. The back feed pulley 21 is rotatably externally inserted to one end side (input portion) of the shaft 16 via a bearing 24, and the friction clutch 25 is provided on the rotating shaft 16 on the outer surface side of the back feed pulley 25. A pressing plate 26 that presses the friction element 27 of the above with a constant biasing force against the pulley 25 is integrally fitted and fixed by a key or the like. .

A one-wake latch 45, to which a rotational driving force from a cam motor 30 described later is transmitted, is connected to the back feed rotary shaft 16 on the outer side of the friction clutch 25. This one-way clutch 45 is of a well-known type in itself, and has a specially shaped cam (slug) between the inner ring and the outer ring, and its wedge action transmits rotation in only one direction. Is being done.

Further, in the roller support housing 15, a back feed pressing roller 53 and a feed pressing roller 54 are respectively provided by a back feed roller pressing mechanism 61 and a feed roller pressing mechanism 62, which will be described later, to the back feed roller. 51 and the feed roller 52 are arranged so as to be selectively brought into pressure contact with and separated from each other (detailed later).

On the other hand, the rotational driving force of the cam motor 30 is divided into two systems and transmitted by the small-diameter pulley 31 and the large-diameter pulley 32 fixed to the output shaft 30a (FIG. 2). That is, the first system is arranged in parallel with the back feed rotary shaft 16, the feed rotary shaft 17, etc. by the endless annular V belt 33 that is wound around the small diameter pulley 31 upward. It is transmitted to a first relay pulley 36 fixed to one end of the relay rotating shaft 35, and from there, through a second relay pulley 38 fixed to the other end of the relay rotating shaft 35, a speed reducer described later. It is transmitted by the V-belt 39 to an input pulley 41 arranged on the input side of 40. Then, it is transmitted from the input pulley 41 to an output pulley 43 fixed to the output side of the speed reducer 40 via a friction clutch 42 designed to act as a torque keeper, and from there, via a timing belt 44. It is transmitted to the input side (outer wheel side) of the one-way clutch 45.

Further, the second system for transmitting the rotational driving force of the cam motor 30 is the band end processing unit 80 described above by the endless annular V-belt 34 wound around the large-diameter pulley 32 obliquely upward. Is transmitted to a pulley 46 provided on the input side of an electromagnetic clutch 47 disposed in the vicinity of, and from there, via the electromagnetic clutch 47 and electromagnetic brake 48, a camshaft 90 of the band end processing unit 80 (see 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 unit 80, and a heater for band heating and melting (not shown). In this type of packing machine, well-known movable members are made to operate at a predetermined timing. There is. 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 OFF. Thus, when the electromagnetic brake 48 is ON, the above operation can be held at the stop position.

In addition to the overall structure as described above, in the present embodiment, the back feed roller pressure contact mechanism 61 and the feed roller pressure contact mechanism 62 attached to the roller support housing 15 are used for the back feed operation. A pressing roller 53 and a feeding pressing roller 54 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, as shown in FIG. 3 and FIG. 4, support shafts 55 and 56 fixed to respective support members 55A and 56A. Are rotatably supported by the support members 55A and 56A, and the support members 55A and 56A are eccentrically located with respect to the pressing rollers 53 and 54, that is, the rotation axes P and Q of the pressing rollers 53 and 54. It is fixed to one end of eccentric shafts 57 and 58, both ends of which are rotatably supported by the roller support housing 15, which have rotation axes X and Y at eccentric positions. The base ends of the swing levers 67 and 68 are fixed to the eccentric shafts 57 and 58, and the solenoids are inserted into the long holes 67a and 68a formed at the swing ends of the swing levers 67 and 68. Pins 65, 66 inserted through the operating rods 63a, 64a of the actuators 63, 64 are loosely inserted, and the vertical linear movement of the operating rods 63a, 64a causes the swing levers 67, 68 to move. Is converted into rotational movement of the eccentric shafts 57 and 58, whereby the back feed pressing roller 54 and the feed pressing roller 55 are selectively pressed against and separated from the back feed roller 51 and the feed roller 52, respectively. It is supposed to be punished.

More specifically, the solenoid type actuators 63, 64 are operated by the urging force of the springs incorporated therein when the built-in solenoids are not energized and energized (OFF). The operating rods 63a and 64a are largely projected as shown by the alternate long and short dash line in FIG. Therefore, at this time, the swing levers 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 are made as shown by the one-dot chain line in FIG. The position is set apart from the back feed roller 51 and the feed roller 52.

On the other hand, when the built-in solenoid is energized and energized (ON), as shown by the solid line (or broken line) in FIG. 4, the actuating rod 63a is resisted against the biasing force of the built-in spring. , 64a are pulled inward. Therefore, at this time, the rocking levers 67 and 68 take the positions as shown by the solid lines (or broken lines) in FIG. 4, and accordingly, the eccentric shafts 57 and 58 rotate by a predetermined angle from the OFF position. Then, the support members 55A and 56A swing, and the pressing rollers 53 and 54 are pressed against the back feed roller 51 and the feed roller 52 as shown by the solid lines in FIG.

The outer peripheral surfaces of the back feed roller 51 and the feed roller 52 are made of urethane rubber which is unlikely to cause the band B to slip. Therefore, the band B is sandwiched between the back feed roller 51 and the back feed pressing roller 53, and between the feed roller 52 and the feed pressing roller 54, and the back feed roller pressing mechanism 61 and By selectively operating the feed roller pressure contact mechanism 62 as described later, the band B can be fed and pulled back accurately at any timing without causing slippage.

In the packing machine 1 of the present embodiment configured as described above, when packing the article W to be packed in the band B, the power of the control device (not shown) is turned on and the automatic insert (band B Is automatically fed from the reel unit to the position where the tip of the feed roller passes the feed roller 52), the high-speed feed motor 10 is activated to rotate the output rotary shaft 10a in the forward direction. The solenoid actuator 64 of the feed roller pressure contact mechanism 62 is operated (ON).

As a result, the rotational driving force of the high-speed feed motor 10 is transmitted from the V belt 12 to the back feed roller 51 via the pulley 21 and the friction clutch 25, and to the feed roller 52 via the pulley 22. As a result, the rollers 51, 52 rotate in the forward direction (feed direction), and the operating rod 64a of the solenoid type actuator 64 is pulled inward, so that the swing arm 68 is indicated by a chain line in FIG. It swings from the position shown to the position shown by the broken line, and accordingly, the eccentric shaft 58 and the support member 56A rotate by a predetermined angle (counterclockwise direction in FIG. 4), and the feed pressing member is rotated. A roller 54 is pressed against the feed roller 52 with a band B therebetween. When the back feed roller 51 rotates normally, the one-way clutch 45 provided at one end of the rotary shaft 16 is idling.

By the above operation, the tip of the band B (the cutting portion at the time of the previous packaging) passes around the lower surface side of the work table 4 and then circulates around the article W while being guided by the gate-shaped arch portion 5. And is fed between the slide guide 86 and the slide table 85 of the band end processing unit 80, and is disposed at the tip end when viewed in the feed direction of the slide guide 86. It is sent to the position detected by (not shown).

At this time, the rear end side of the band B passes through the gap formed between the back feed roller 51 and the back feed pressing roller 53 that is not in pressure contact with each other, and the guide surface 59a of the guide member 59 and the like. Is guided so as to pass through between the slide guide 86 of the band end processing unit 80, the press 84 and the rear grip 82. When the tip of the band B is detected by the proximity switch, the high-speed feed motor 10 is temporarily stopped and the solenoid actuator 64 of the feed roller pressing mechanism 62 is turned off. As a result, the band feed 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, 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 increased. It is transmitted to the camshaft 90 via the V-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.

Next, with the tip portion of the band B held, the high-speed feed motor 10 is restarted so that its output rotary shaft 10a is rotated in the direction opposite to that at the time of band delivery. At the same time, the solenoid actuator 63 of the back feed roller pressing mechanism 61 is operated (ON). As a result, similarly to the above, the rotational driving force of the high-speed feed motor 10 is transmitted from the V belt 12 to the back feed roller 51 via the pulley 21 and the friction clutch 25, and the feed roller 52 via the pulley 22. Is transmitted to the rollers 51 and 52 in the opposite direction (retracting direction), and the actuating rod 63a of the solenoid actuator 63 is retracted inward so that the swinging arm 67 is moved to one point in FIG. It swings from the position shown by the chain line to the position shown by the solid line, and accordingly, the eccentric shaft 57 and the support member 55A rotate by a predetermined angle (clockwise direction in FIG. 4), and the back feed presser roll is rotated. The roller 53 is pressed against the back feed roller 51 with the band B interposed therebetween.

At this time, the back feed roller 51 is rotated faster than the rotation speed at which the one-way clutch 45 is in the meshed state, so that the one-way clutch 45 (between the inner and outer wheels thereof) is in a slipping state, The rotational driving force from the cam motor 30 via the timing belt 44 is not transmitted to the rotary shaft 16 of the back feed roller 51. 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 pressed against the back feed roller 51, and the primary tightening is performed. .

When the band B comes into contact with the outer peripheral surface of the article to be packed W and the surplus amount of the delivery is pulled back, and the tension acting on the band B suddenly increases, the load acting on the high-speed feed motor 10 becomes large. At the same time, the frictional force between the backfeed roller 51 and the band B suddenly increases, whereby the friction clutch 25 slides out, and the rotary shaft of the backfeed roller 51 driven by the high-speed feed motor 10 is driven. The rotation speed of 16 decreases rapidly.

When the rotation speed of the rotation shaft 16 decreases to the rotation speed of the one-way clutch 45 rotated by the cam motor 30 to the outer ring side, the slug of the one-way clutch 45 meshes, and this time. A low-speed, high-torque rotational driving force is transmitted from the cam motor 30 to the rotary shaft 16 of the back feed roller 51 via the speed reducer 40, whereby the band B is fed to the back feed roller 51 and the back feed roller 51. The secondary tightening is performed by being strongly pulled while being sandwiched between the pressing roller 53. Then, when the band B is tightened to a certain degree, the friction clutch 42 provided on the input side of the speed reducer 40 starts to slide out, so that the article W to be packed is not excessively tightened in the band B. To be done.

After the secondary tightening is performed in this manner, in the band end processing unit 80, the rear grip 82 holds the rear end side of the band B and the front end of the band B by the heater. The heating and melting of the polymerized portion with the rear end portion, the pressing and cooling of the melted polymerized portion with the press 84, and the cutting of the rear end of the band B are performed in a known manner and procedure, whereby the article W It is packed by band B.

As described above, in the packing machine 1 of the present embodiment, the solenoid type actuators 63 and 64 are electrically turned on and off so that the pair of backfeed rollers 51 and 53 and the pair of feed rollers 52 are fed. , 54 can be brought into pressure contact / separation with each other, so that the pair of rollers 51, 53 and 52, 54 can be immediately brought into a pressure contact state or in a separated state at an arbitrary time, and the pressure contact / separation timing can be set. It can be set freely.

Further, the roller pressure contact mechanisms 61 and 62 are inexpensive and easily available, and the solenoid actuators 63 and 64, the swing levers 67 and 68, the eccentric shafts 57 and 58, the roller support members 55A and 56A, etc. Since they can be assembled simply by connecting them in series, the layout of the components is easy, and the overall configuration is simple, making it cheap to manufacture.

Further, the driving force of the solenoid type actuators 63 and 64 is the amount of eccentricity between the eccentric shafts 57 and 58 and the rollers 53 and 54 with respect to the lengths of the swing levers 67 and 68 (rotation axis lines XP, Y- Since it is expanded by the "lever principle" according to the ratio of (distance between Q), a sufficient pressure contact force can be obtained even with a small solenoid type actuator.

[0036]

[Effect of device]

 As can be understood from the above description, the packing machine of the present invention is designed so that at least one of the rollers is rotated, and the band is sandwiched between a pair of rollers that are pressed against each other to feed out, pull back, and tighten the band. In addition to being able to immediately put the pair of rollers into pressure contact with each other at any time or to separate them, the pressure contact / separation timing can be freely set. It is simple and inexpensive to construct, and has an excellent effect that the layout of its components is easy and a large pressing force can be obtained with a small driving force.

[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 a characteristic part of the packing machine of the embodiment.

FIG. 4 is an enlarged front view showing a characteristic part of the packing machine of the embodiment.

[Explanation of symbols]

 51-back feed roller 52-feed roller 53-back feed pressing roller 54-feed pressing roller 55A, 56A-roller supporting member 57, 58-eccentric shaft 63, 64-solenoid actuator 63a, 64a-operating rod 67, 68-Rotating lever W-Item to be packed B-Band

Claims (2)

[Scope of utility model registration request] 1. A band B is sandwiched between a pair of rollers 51 and 53, at least one of which is rotated and pressed against each other, and the band B is fed out and pulled back,
A packing machine configured to perform tightening and the like, wherein one roller 53 of the pair of rollers 51 and 53 is used.
Is axially supported by the support member 55A, and the support member 5
An eccentric shaft 57 is fixed at a position eccentric to the roller 53 in 5A, a base end portion of a swing lever 67 is fixed to the eccentric shaft 57, and a swing end portion of the swing lever 67 is a solenoid. Type actuator 63 is connected to an operating rod 63a, and the linear movement of the operating rod 63a causes the swing lever 6 to move.
7. The packing machine is characterized in that it is converted into a rotational movement of the eccentric shaft 57 via 7 so that the one roller 53 can be selectively brought into pressure contact with and separated from the other roller 51. . 2. A feed roller 52 for rotating the band B and a feed pressing roller 54 for press-contacting the band B in order to draw the band B around the article W placed on the work table 4. After being sandwiched and sent out, the band B is sandwiched between a back feed roller 51, which is rotationally driven to rotate the sending surplus so as to wind the outer peripheral surface of the article W, and a pressing roller 53, which is pressed against the back feed roller 51. In the packing machine configured to perform the secondary tightening in which the fast tightening is performed at a high speed with a low torque and then the strong tightening is performed at a low speed with a high torque, at least the back feed pressing roller 53 of the two pressing rollers 53, 54 is provided. Is axially supported by the support member 55A, and the pressing roller 53 in the support member 55A is An eccentric shaft 57 is fixed at a position eccentric to the eccentric shaft 57, a base end of a swing lever 67 is fixed to the eccentric shaft 57, and a swing end of the swing lever 67 is an operating rod of a solenoid actuator 63. 63a, the linear movement of the operating rod 63a is converted into the rotational movement of the eccentric shaft 57 via the swing lever 67, whereby the pressing roller 53 selectively with respect to the back feed roller 51. A packing machine characterized in that it can be pressed and separated.