JP2000226012A - Shrink packaging machine for annular material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shrink packaging machine of superior practical provisions, in the constitution of which a plane disposition space can be formed small, the machine can easily be attached to an existing line, only materials for which shrink packaging is required can selectively be picked up and the line is not required to be used for the restricted purpose as an exclusive shrink packaging line only. SOLUTION: A film feed section 11 and a heating chamber 15 are disposed on the side of an annular material carrier conveyor 9, and a primary hand mechanism 19 is so placed on a rail 45 as to move above the conveyor 9, and three second hand mechanisms 31 are set on a chain 33 passing through the heating chamber and traveling in the endless shape, while a third hand mechanism 19' for removing is disposed above the conveyor. When an annular material 17 is carried around, a hand 23 of the primary hand mechanism in the vertical posture is inserted inside the annular material and opened therein to hold the annular material, and then a holding hand is lifted and switched over to the horizontal posture to set the annular material in the standing-up posture and moved to the side of the conveyor, and while the primary hand mechanism is moved in the above state, the winding of a film 25 is carried out. Then the annular material is received by a hand 37 of the secondary hand mechanism and lastly the annular material is returned onto the conveyor by the third hand mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shrink wrapping machine for an annular material, and more particularly to a shrink wrapping machine having a hand mechanism for holding an annular material from the inside.

[0002]

2. Description of the Related Art There have conventionally been various proposals for a shrink wrapping machine for automatically shrink wrapping an annular material such as a wire rod or a tire around which an electric wire or a hose is wound. After the film for packaging is wound around an annular object in the shape of a sleeve, the packaging is completed by heat shrinking the film in the shape of a sleeve. JP-A-5-4627 and JP-A-9-77016 describe, for example, a shrink wrapping machine having such a configuration. Is held from the inside thereof, so that there is an advantage that the reliability of the operation can be obtained, for example, there is no possibility that the circular object falls down during the processing.

[0003]

SUMMARY OF THE INVENTION A shrink wrapping machine is
Normally, products are continuously arranged on a production line, so that they are required to have a compact shape, to be arranged in as small a space as possible, or to be arbitrarily attached to an existing line. In this regard, in the conventional shrink wrapping machine, since the entire process from picking up the annular material to film hanging, heat treatment and removal is developed in a horizontal plane, a considerable space is required for installation. There was a problem.

Further, in the conventional shrink wrapping machine, the heat shrinkage of the film is controlled by preliminary heating in a state where the annular material is held by the holding hand, that is, the portion projecting from the annular material is formed along the end face of the annular material. Preheating, and main heating, in which the annular material is transferred to a conveyor dedicated to the shrink tunnel, is performed in two stages, so it takes time, and it is not easy to attach it to the existing line. Was.
In particular, since it is difficult to configure a system for picking up only those to be packaged from the ring-shaped materials on the line and performing a shrink process, there is a problem that the shrink packaging machine must be developed as a dedicated line.

The present invention has been made in view of the above-mentioned conventional problems, and requires only a small planar arrangement space, and can be easily attached to an existing line. An object of the present invention is to provide a shrink wrapping machine for an annular material that is excellent in practical deployment, for example, it is possible to selectively pick up only what is necessary and not to restrict the line as a line dedicated to shrink wrapping. Another object of the present invention is to provide a shrink wrapping machine for an annular object that can simplify a heating step and effectively prevent a thermal trouble from occurring in a mechanism, in addition to the above objects. I do.

[0006]

In order to attain this object, a shrink wrapping machine for an annular object according to the first aspect of the present invention is provided with a track extending parallel to a conveyor for transporting the annular object, and a film wound around the annular object. A film supply section for supplying and a heating section for shrinking the wound film are arranged beside the conveyor in a direction parallel to the conveyor, and at least one hand mechanism for detachably holding an annular member is provided on the conveyor. The hand mechanism is supported on the track so as to move upward, and the hand mechanism is a holding hand that is opened and closed in a radial direction from a central axis, and a holding hand advance / retreat unit that advances and retreats the holding hand in the direction of the central axis. A shrink wrapping device, comprising: a posture switching means for switching the holding hand between a vertical posture in which the central axis extends vertically and a horizontal posture in which the central axis extends laterally. When the to-be-ringed object is conveyed, the holding hand is inserted into the inside space of the tongue in a vertical position and opened by holding the ring-shaped object, and then the holding hand is pulled up and switched to the horizontal position. The ring-shaped object is moved to the side of the conveyor in a standing posture, and in this state, at least the film is wound around the ring-shaped object while moving the hand mechanism along the track.

According to the present invention, since a hand mechanism for moving at least from pickup of an annular object to winding of a film around the annular object and its moving space are provided by utilizing a space above the line, this type of mechanism is provided. About half of the space required for the packaging machine can be deployed vertically. Therefore, the planar space required for the arrangement can be reduced, and it can be easily attached to an existing line, and the line does not have to be restricted as a line dedicated to shrink wrapping.

In embodying the present invention, one hand mechanism consistently plays a role in holding an annular object in all steps from pickup of the annular object to winding of the film, heat treatment, and return to the conveyor. Alternatively, some hand mechanisms may be shared and sequentially delivered. In addition, the track in the present invention may be a fixed track like a rail, or a track itself running like a chain.

According to a second aspect of the present invention, in the shrink wrapping machine for an annular material according to the first aspect, a secondary hand mechanism that passes through a heating unit is provided separately from the hand mechanism on the track, and the annular material is hung on a film. Is received by the secondary hand mechanism while standing. By doing so, it is not necessary to separate the heating process for the film into preliminary heating and main heating, and the heating process is completed at once, so that the processing speed can be increased by that much,
The structure can be simplified.

According to a third aspect of the present invention, in the shrink wrapping machine for an annular object according to the second aspect, the holding hand of the secondary hand mechanism is constantly urged in the opening direction by a resilient member. The holding hand opening / closing means for opening / closing the holding hand is disposed outside the entrance and the exit of the heating unit. In this way, it is possible to reliably prevent a thermal trouble from occurring in the operation of the holding hand. That is, when a holding hand opening / closing means using a fluid pressure such as an air cylinder is directly mounted on the hand mechanism, when the holding hand opening / closing means passes through the heating section, the pressure of the fluid changes due to thermal influence. This is because there is a risk of malfunction, but such a thermal trouble does not occur with the configuration of the present invention.

According to a fourth aspect of the present invention, in the shrink wrapping machine for an annular object according to the second or third aspect, a plurality of secondary hand mechanisms are attached to an endless traveling chain extending in a direction parallel to the conveyor. Only the upper traveling path of the chain is passed through the heating unit.

In this manner, the processing speed can be increased, the tact of the entire line can be easily adjusted, and the hand mechanism can be protected from thermal damage. That is, even if the hand mechanism that has completed the required work after moving along the predetermined route does not immediately return to the movement origin, another hand mechanism performs processing for the next annular object, so that time loss for returning to the origin is reduced. No processing occurs and the processing speed can be considerably increased. In addition, by selecting the number and arrangement intervals of the hand mechanisms and the traveling speed of the traveling chain, the timing at which the hand mechanisms wait at the movement origin can be easily synchronized with the timing at which the annular material is supplied. It is very easy to match the tact of the whole line. Since a certain time elapses before the hand mechanism that has exited the heating unit returns to the origin, the time during which each of the hand mechanisms is exposed to a high temperature is extremely short, and thus the hand mechanisms are thermally affected. Can be minimized.

According to a fifth aspect of the present invention, in any one of the annular shrink wrapping machines according to any one of the second to fourth aspects, a tertiary hand mechanism for receiving the annular material passed through the heating unit and lowering it on the conveyor is provided above the conveyor. It is arranged in.
According to the present invention, the number of parts arranged above the conveyor is further increased, so that the planar space required for the arrangement can be further reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shrink wrapping machine 1 for a wire roll according to an embodiment of the present invention will be described below with reference to the drawings. [A. Overview] (Refer to FIGS. 1 to 3) First, an overview of the shrink wrapping machine 1 will be described. Reference numeral 3 denotes an installation base of the shrink wrapping machine 1, and a film hooking / transporting unit is provided at a rear portion of the installation base 3 (an upward direction in FIG. 1 is a rear side, and a leftward direction in the figure is a left side). 5 and a removing unit 7 are arranged side by side on the left and right, and a belt conveyor 9 extending in the left and right direction below the film hanging and conveying unit 5 and the removing unit 7 is provided. In addition, a film supply unit 11 is disposed on the left side of the installation base 3 (a side of the front side of the conveyor 9), and a heating transport unit 13 is disposed on the right side. ing.

Reference numeral 17 denotes a wire roll. The wire roll 17 is formed, for example, by winding and binding an electric wire in a roll shape. The wire roll 17 is transported on the belt conveyor 9 in a horizontal posture, that is, as shown by a solid line in FIG. 1, in a posture in which the axis of the roll extends in the vertical direction. Lots that pass through as they are and are to be shrink-wrapped are picked up by the primary hand mechanism 19 of the film hanging and transporting section 5.

The primary hand mechanism 19 has a holding hand 23 having three fingers 21 that open and close in the radial direction with respect to each other.
(See FIG. 6), and is moved between a pickup position shown by a solid line in FIG. 1 and a delivery position shown by a two-dot chain line in FIG.
1 is switched between a vertical position in which the finger 1 extends vertically and a horizontal position in which the finger 21 extends horizontally as indicated by a two-dot chain line in FIG.

The detaching section 7 also has a tertiary hand mechanism 19 'having exactly the same structure as the primary hand mechanism 19, and the tertiary hand mechanism 19' can also switch its posture between a vertical posture and a horizontal posture. It is in a horizontal posture as shown in FIG.

The wire rod 17 conveyed on the belt conveyor 9 is picked up from the belt conveyor 9 by being held from the inside by the holding hand 23 of the primary hand mechanism 19 which is at the initial position in a vertical posture. This holding is performed by the three fingers 21 being inserted into the inside of the wire roll 17 to open each other, and
Is performed by press-fitting the inner peripheral surface with appropriate strength.
Then, the primary hand mechanism 19 picking up the wire roll 17 is rotated by 90 ° at that position to be in a horizontal posture and the wire roll 17 stands up, that is, as shown in FIG. To an extended posture.

The film supply unit 11 includes a film (polyethylene film) 25 for packaging the wire roll 17.
The film 25 pulled out from the film roll 27 passes through the path shown in FIG. 2 and passes through a path extending in the vertical direction slightly before the primary hand mechanism 19 at the initial position. You. A pair of upper and lower heat sealers 29 and 29 ′ that are raised and lowered by an air cylinder are disposed on the right side of this path. Wire rod 1 picked up by primary hand mechanism 19
Numeral 7 is in a standing posture when the primary hand mechanism 19 falls down in a horizontal posture, and faces the film 25 passing through the path from the left side.

From this state, the primary hand mechanism 19 moves from FIG.
And the film 25 is relatively wound around the wire roll 17. Here, the movement of the primary hand mechanism 19 is temporarily stopped, and the heat sealers 29 and 29 'come into contact with each other with the film 25 interposed therebetween as shown by a two-dot chain line in FIG. As a result, the portion of the film 25 wound around the wire roll 17 is bound and cut off in a sleeve shape. Thus, the sleeve-shaped film is hung on the wire roll 17.

The heating / transporting section 13 includes three secondary hand mechanisms 3
One. These three secondary hand mechanisms 31 are attached to a chain 33 running endlessly at regular intervals.
Each has a holding hand 37 (see FIG. 10) having three fingers 35 that can be opened and closed. The traveling direction of the chain 33 is such that it travels to the right on the upper traveling path, and the upper traveling path passes through the heating chamber 15. 180 ° C to 200 ° inside this heating chamber 15
Heated to about C.

As shown in FIGS. 1 and 2, when the secondary hand mechanism 31 comes to the left and right sides of the heating chamber 15, the running of the chain 33 is temporarily stopped. As described above, when the chain 33 is temporarily stopped, the secondary hand mechanism 31 located on the left side of the heating chamber 15 faces the primary hand mechanism 19 that has reached the delivery position. Here, the primary hand mechanism 1
9 protrudes forward to relatively insert the holding hand 37 of the secondary hand mechanism 31 inside the wire roll 17, and then the holding hand 37 of the secondary hand mechanism 31 opens to hold the wire roll 17. Then, the holding hand 23 of the primary hand mechanism 19 closes and retreats.

From here, the primary hand mechanism 19 returns to the vertical position and returns to the pickup position,
Resumes running. As a result, the wire roll 17 received by the secondary hand mechanism 31, that is, the wire roll 17 on which the sleeve-like film 25 is hung, is passed through the heating chamber 15, and the film 25 is shrunk by heating and shrinking. . Then, the wire roll 17 is moved to the heating chamber 15.
Immediately after exiting from the right side, the chain 33 temporarily stops, and this wire rod (shrink-wrapped wire roll) 17 is transferred to the tertiary hand mechanism 19 ′ of the removing section 7, and this tertiary hand mechanism 19 ′ After receiving the wire roll, the wire roll is turned to the vertical position, thereby the wire roll 1
7 is lowered to the horizontal position on the belt conveyor 9.

While the wire roll 17 is passing through the heating chamber 15, the primary hand mechanism 19 picks up and hooks the film on the next wire roll 17 in the film hanging and transporting section 5, and the primary hand mechanism 19 is a chain. 33 comes to the delivery position at substantially the same timing as when it stops. The above operation is repeated, and the shrink wrapping of the wire roll 17 is performed one after another.

Next, details of the structure and operation of each of the above-described units will be sequentially described. [B. Film Hanging and Conveying Section] (See FIGS. 1 to 6) [B-1. Structure 41 indicates a machine base of the film hanging and conveying unit 5. The machine base 41 is long in the left-right direction, and a rail 45 is mounted on a rail base 43 (see FIG. 4) fixed to both front and rear ends of the upper surface, and a rack (not shown) is provided on the front side of the rear rail 45. Is formed.

Reference numeral 47 denotes a moving base of the primary hand mechanism 19. The moving base 47 has a rectangular frame shape, is slidably mounted on a rail 45, and has a sliding motor 49 mounted on the right side thereof. Have been. In addition, moving base 4
7 has a pinion gear 51 meshed with the rack.
(See FIG. 3) is rotatably mounted, and the pinion gear 51 is rotated by a motor 49. Accordingly, when the motor 49 is driven, the moving base 47 is moved in a direction corresponding to the rotation direction, whereby the primary hand mechanism 19 is moved between the above-described initial position and the delivery position.

A substantially square base plate 53 is mounted on the upper surface of the movable base 47, and a large rectangular hole 53a is formed at a substantially central portion thereof.
Has reached the front edge of the base plate 53. Above the front end of the base plate 53, a rotation shaft 55 extending in the left-right direction is provided so as to be rotatable around the axis.
A driven side timing pulley 57 is fixed to the right end of the rotation shaft 55. A motor 59 for rotating the hand mechanism is fixed to the right end of the rear end of the base plate 53. The drive timing pulley 61 (see FIG. 5) attached to the output shaft of the motor 59 and the driven timing pulley 57 are connected to each other. A timing belt 63 is stretched between them. Accordingly, the rotation shaft 55 is rotated according to the drive of the motor 59, and the rotation amount is a central angle of 90 °.

Reference numeral 65 denotes a hand mechanism base. The hand mechanism base 65 has a rectangular flat plate shape. The hand mechanism base 65 stands in a front-rear direction like a wall as viewed in the state shown in FIG. 5, and a coupling block 67 attached to the front surface thereof is fixed to the rotating shaft 57. The primary hand mechanism 19 is mounted on the back of the hand mechanism base 65.

The primary hand mechanism 19 includes a two-way air cylinder 69 (see FIG. 5) and this air cylinder 69.
The holding hand 37 is moved up and down by the controller. The air cylinder 69 is attached to an intermediate portion in the left-right direction on the back surface of the hand mechanism base 65 in a direction extending vertically, and a connecting plate 71 is fixed to a tip of a piston rod 69a projecting upward from its casing. Two guide rods 73 are attached to the left and right ends of the connection plate 71 in a hanging manner, and a holding hand attachment plate 75 is fixed to lower ends of the guide rods 73.

The holding hand 37 (see FIGS. 5 and 6)
A hand base 77 having a substantially equilateral triangular plate shape, three guide blocks 79 fixed to the lower surface of the hand base 77, and three guide blocks 79 slidably supported by the three guide blocks 79, respectively. And a finger 35. The three guide blocks 79 are provided so as to extend radially from each other with a straight line passing through the center of the hand base 77 in the vertical direction as a central axis, and are arranged at equal intervals in the circumferential direction. Specifically, in a state where the primary hand mechanism 19 is in a horizontal posture, one guide block 79 is disposed in a positional relationship extending directly above the central axis.

Each of the guide blocks 79 has a small air cylinder (not shown) which is driven in synchronization with each other, and has a guide groove 79a formed on the surface opposite to the hand base 77. Further, the three fingers 35 are formed in a relatively narrow plate shape extending in parallel with the axial direction of the air cylinder 69, and the base ends thereof are slidably engaged with the guide grooves 79 a of the guide block 79. In this state, it is connected to an actuator of an air cylinder (not shown). The distances of the three fingers 35 from the central axis are equal to each other. Such a holding hand 37 is connected to the piston rod 69a of the air cylinder 69 by attaching the hand base 77 to the holding hand mounting plate 75.

The primary hand mechanism 19 is configured as described above. Accordingly, the primary hand mechanism 19 is switched from the vertical attitude to the horizontal attitude or from the horizontal attitude to the vertical attitude by driving the motor 59 for rotating the hand mechanism, and in the state of being in the vertical attitude, FIG.
As can be seen from FIG.
Faces the belt conveyor 9 from directly above through the holes 53a of the base plate 53.

When the air cylinder 69 pushes the piston rod 69a out of the cylinder case, the holding hand 37 is moved to the retracted position shown by the solid line in FIG. 4, and from this state, the piston rod 69a is moved to the cylinder case. As it is drawn inward, it is moved to the protruding position indicated by the dashed line in FIG. The distance between the retracted position and the projected position, that is, the movement stroke of the holding hand 37 is
It is about 1.5 times the thickness of the wire rod 17. When the three fingers 35 are in the closed position, the radius of the circle formed by the outer peripheral surface of the protection member 81 is approximately three-fifths of the radius of the inner peripheral surface of the wire roll 17.
About.

[B-2. Operation] In the initial state, the primary hand mechanism 19 stands by at the vertical position at the pickup position, the holding hand 37 is at the retracted position, and the finger 35 is closed. From this state, when the wire roll 17 conveyed by the belt conveyor 9 comes on the center axis of the holding hand 37, the belt conveyor 9 temporarily stops. Then, the primary hand mechanism 19 first moves the holding hand 37 to the projecting position, inserts the tip of the finger 35 into the inside of the wire rod roll 17, and then moves the guide block 7
An air cylinder (not shown) built in 9 urges the fingers 35 in a direction to open each other. This allows
The finger 35 is pressed against the inner peripheral surface of the wire roll 17 to hold the wire roll 17. Since this pressure bonding by the finger 35 is performed at three equally spaced positions in the circumferential direction of the inner peripheral surface of the wire roll 17, the wire roll hardly deforms.

When the finger 35 holds the wire roll 17 in this manner, the holding hand 37 is returned to the retracted position. As a result, the wire roll 17 is picked up from the belt conveyor 9, and then the motor 59 is driven to bring the primary hand mechanism 19 into a horizontal posture as shown by a two-dot chain line in FIG. As a result, the picked-up wire roll 17 is in a standing posture, as shown by a solid line in FIG.

Here, the slide motor 49 is driven to move the primary hand mechanism 19 to the intermediate position. By this movement, the film 25 is relatively wound around the wire roll 17, and thereafter, the processing on the film 25 is performed by the operation described above, and the primary hand mechanism 1
9 moves to the delivery position while holding the wire rod 17 on which the film is hung.

[C. Heating and Conveying Section] (See FIGS. 1, 2, 7 to 10) [C-1. Structure] 91 indicates a machine base of the heating and conveying unit 13.
The above-mentioned chain 33 is provided in two front and rear parallel to each other, and is endlessly wound around four sprocket wheels 93 located at respective vertices of a flat inverted isosceles trapezoid. Bearing brackets 95 (see FIG. 7) protrude from the left and right ends of the upper end of the machine base 91. Two left and right rotating shafts 9 extending in the front-rear direction are provided at the ends of the bearing brackets 95.
7 is rotatably supported. The upper four of the four sprocket wheels 93 are respectively fixed to the front and rear ends of the rotating shaft 97, and the lower four are rotatable on another bearing bracket 99 (see FIG. 8) projecting downward from the machine base 91. It is supported by.

The left one of the left and right rotating shafts 97 is rotated by a chain running motor 101 (see FIGS. 7 and 8). Accordingly, when the motor 101 is driven, the two chains 33 simultaneously run in the same direction. The upper traveling path of the chain 33 is located slightly higher than the upper surface of the machine base 91, and the lower traveling path passes through the inside of the machine base 91.

As described above, the secondary hand mechanism 31
And a hand mechanism base 103 fixed to the chain 33, a casing 105 fixed to the hand mechanism base 103, a holding hand 37, and control means for controlling the fingers 35 of the holding hand 37. ing.

The hand mechanism base 103 is in the form of a square flat plate, and connecting members 107 (see FIG. 9) fixed to the front and rear ends of the back surface thereof are connected to the chain 33.
A small roller 109 is attached to the center of the back surface of the hand mechanism base 103, and the secondary hand mechanism 31 uses the rails 111 (FIGS. 7 and 8) while the roller 109 moves along the upper traveling path of the chain 33. 9), the posture is stably maintained by rolling the lower surface of the chain 33.
While moving on the lower traveling route, the roller 109 rolls on the upper surface of another rail 113 (see FIGS. 7 and 8), so that the posture is stably maintained.

The casing 105 (see FIG. 9 for the internal structure) has a drum-shaped box shape and is provided so as to rise from the rear half of the upper surface of the hand mechanism base 103. A cylindrical boss 117 extending in the front-rear direction is fixed to the center of the casing 105, and a control rod 119 is slidably inserted through the boss 117. The control rod 119 is always attached to the rear by a compression coil spring 121. It is being rushed.

The holding hand 37 of the secondary hand mechanism 31
It is provided so as to protrude rearward from the casing 105, and includes three guides 123 attached to the front surface of the casing 105 and three fingers 35 individually supported by the guides 123. The three guides 123 are a pair of guide walls 123 extending parallel to each other.
a provided in a direction extending in the radial direction with the boss 117 as a center, and are arranged at equal intervals in the circumferential direction. Specifically, one guide 123 is arranged in a positional relationship extending directly below the boss 117. Casing 1
In the front wall 05, holes 105a (see FIG. 9) are formed at positions respectively corresponding to the three guides 123.

Most of the finger 35 is formed in a relatively narrow plate shape extending in the front-rear direction, and its front end 35a is slidably engaged with the guide 123.
A protection member 125 is attached to the tip. Also,
A connecting piece 127 protrudes forward from a front end 35a of the finger 35, and the connecting piece 127
05 through the hole 105a formed in the casing 1
05, and a long hole 127a is formed.

A slider 129 (see FIG. 9) is slidably fitted to a portion of the boss 117 that passes through the casing 105. A substantially triangular connecting plate 131 is provided at the rear end of the control rod 119 (see FIG. 10).
Is attached, and the connecting plate 131 and the slider 129 are connected by bolts 133. Therefore, the control rod 119 and the slider 129 move in the front-rear direction integrally with each other. Three connecting pieces 135 project from the slider 129 in the radial direction, and the connecting pieces 135 are formed with long holes 135a.

Three lever support brackets 137 are mounted on the inner surface of the rear wall of the casing 105.
Connecting levers 139 are rotatably supported by the lever support brackets 137, respectively. This connecting lever 1
39 is formed in a substantially L-shape, the bent portion thereof is supported by a lever support bracket 137, and the roller 14
1 is provided. One of these rollers 141 is slidably engaged with a long hole 127a formed in the connecting piece 127 of the finger 35, and the other roller 141
Is a long hole 1 formed in the connecting piece 135 of the slider 129.
It is slidably engaged with 35a.

Therefore, when the control rod 119 moves backward (moves rightward in FIG. 9), the connecting lever 139 is moved.
Is rotated clockwise in FIG.
5 is pushed in a direction away from the boss 117. Conversely, when the control rod 119 moves forward (moves to the left in FIG. 9), the connecting lever 139 turns counterclockwise in FIG.
Press in the direction to approach. Thus, the three fingers 35 are opened when the control rod 119 moves backward, and are closed when the control rod 119 moves forward. Incidentally, the distances of the three fingers 35 from the boss 117 are equal to each other.

As described above, the control rod 119 is constantly urged rearward by the coil spring 121, and the opening operation of the finger 35 is performed by the coil spring 121.
Done by That is, when the control rod 119 is not pressed forward, the three fingers 35 are moved in the opening direction as the control rod 119 moves backward. When the finger 35 moves to the maximum in the opening direction, the radius of the circle formed by the protective member 125 of these three fingers 35 is slightly larger than the radius of the inner peripheral surface of the wire roll 17. A flange plate 127 is attached to the front end of the control rod 119.

The closing operation of the finger 35 is performed by a rod pulling cylinder 143 provided outside the hand mechanism 31. There are two left and right rod pulling cylinders 143, which are provided on the front sides of the two secondary hand mechanisms 31 located on both left and right sides of the heating chamber 15 when the traveling of the chain 33 is stopped, respectively. The rod engaging element 147 is attached to the tip of the piston rod 145 that protrudes. This rod engaging element 14
The upper and lower sides of the rod 7 have a substantially L-shape when viewed from the side. When the chain 33 stops, the flange plate 127 of the control rod 119 enters the inside of the rod engaging element 147 (see FIG. 9). ).

From this state, the rod tension cylinder 143
Is driven in the retracting direction, the rod engaging element 147 pulls the control rod 119 forward through the flange plate 127. As a result, the slider 129 moves forward to rotate the connection lever 139 counterclockwise, so that the three fingers 35 are moved in the closing direction. When the rod pulling cylinder 143 drives the piston rod 145 to protrude out of the casing from this state, the pulling of the control rod 119 forward is released. Thereby, the finger 35 is moved in the opening direction.

A mechanism base lock cylinder 151 is arranged below the rod pulling cylinder 143 (FIG. 7).
To FIG. 9). This mechanism base lock cylinder 151
The arm 153 protruding rearward is attached to the piston rod 151a.
The lock pin 155 is attached to the lower surface of the tip of the arm 153. An annular lock pin insertion portion 157 is fixed to the front end of the hand mechanism base 103. When the chain 33 stops, the mechanism base lock cylinder 151 is driven in a direction of retracting the piston rod 151a, whereby the lock pin 155
Is inserted into the lock pin insertion portion 157.

[C-2. Operation] In the initial state, the chain 33 is stopped at a predetermined stop position. Therefore, the secondary hand mechanisms 31 are located one by one on both the left and right sides of the heating chamber 15, and the piston rod 1 of the rod pulling cylinder 143 is moved.
45 is pulling the control rod 119 forward, and the finger 35 is closed. In addition, hand mechanism base 1
A lock pin 155 is inserted into the lock pin insertion portion 157 of 03 to precisely define the stop position of the secondary hand mechanism 31.

When the primary hand mechanism 19 comes to the delivery position from this state, the holding hand 2 of the primary hand mechanism 19
3 and the axis of the holding hand 37 of the secondary hand mechanism 31 stopped at the left side of the heating chamber 15 coincide with each other (see FIG. 1), and when viewed from the direction of this axis, the secondary hand The three fingers 35 of the mechanism 31
Located between two fingers 21. Here, the holding hand 23 of the primary hand mechanism 19 projects forward, and the holding hand 37 of the secondary hand mechanism 31 is relatively inserted inside the wire roll 17 (see FIG. 9). Next, the piston rod 14 of the rod tension cylinder 143 is
5 protrudes rearward to release tension on the control rod 119, whereby the finger 35 of the secondary hand mechanism 31 opens to hold the wire roll 17.

From here, the primary hand mechanism 19 closes the holding hand 23 and retreats, then returns to the vertical position and returns to the pickup position. And the secondary hand mechanism 31
In, the lock by the mechanism base lock cylinder 151 is released, and the chain 33 resumes running. As a result, the wire rod 1 received by the secondary hand mechanism 31
7, that is, the wire roll 17 on which the sleeve-shaped film is hung is passed through the heating chamber 15, and the film 25 is heated and shrunk to be shrink-wrapped.

[D. Removal Unit] (Refer to FIGS. 1 and 3) Reference numeral 161 denotes a machine of the removal unit 7, and a tertiary hand mechanism 19 'is mounted on the machine 161. As can be seen from the drawing, this tertiary hand mechanism 19 ′ is only symmetrical to the primary hand mechanism 19 and has no difference in structure. Therefore, the description of the structure of the tertiary hand mechanism 19 ′ will be omitted by assigning the same reference numerals to those used in the primary hand mechanism 19.

The position of the tertiary hand mechanism 19 'in the left-right direction is fixed. In an initial state, the tertiary hand mechanism 19' stands by in a horizontal posture, and the holding hand 23 closes the finger 21 at the retracted position. As described above, the chain 33 temporarily stops immediately after the wire rod 17 after the shrink wrapping comes out of the heating chamber 15 to the right. In this state, the axis of the holding hand 37 of the secondary hand mechanism 31 holding the wire rod 17 coincides with the axis of the holding hand 23 of the tertiary hand mechanism 19 '(see FIG. 1). As viewed from the direction of the axis, the three fingers 35 of the secondary hand mechanism 31 are located between the three fingers 21 of the tertiary hand mechanism 19 '.

Here, the tertiary hand mechanism 19 'projects the holding hand 23, inserts the tip of the finger 21 into the wire rod 17 and opens it, and then the secondary hand mechanism 31 closes the finger 35. As a result, the wire roll 17 is transferred to the tertiary hand mechanism 19 '. Thereafter, the tertiary hand mechanism 19 ′ returns the holding hand 23 to the retracted position and then rotates to the vertical position, and then projects the holding hand 23 to lower the wire roll 17 onto the belt conveyor 9. Then, the tertiary hand mechanism 19 'returns the holding hand 23 to the retracted position, and then returns to the horizontal posture and waits there. The wire roll shrink wrapping machine 1 is configured as described above.

Although the embodiment of the present invention has been described in detail, the specific configuration is not limited to this embodiment, and there is a change in design without departing from the gist of the present invention. Are also included in the present invention. For example, in the embodiment, the hand mechanism has three fingers. However, depending on the quality of the target circular object, even two fingers may be used.
There may be four or more. However, if three fingers are used, almost all of them can be held without deforming regardless of the quality of the annular material, and the versatility is expanded. In the embodiment, the annular material as the object to be wrapped is a wire rod. However, the present invention is not limited to the wire roll, and various annular materials (electric wires,
The present invention can be widely applied as a packaging machine for shrink-wrapping various kinds of rigid annular materials such as wires, thin strings, hoses, catheter tubes, and the like.

[0058]

As described above, according to the shrink wrapping machine for an annular object according to the first aspect, the hand mechanism for performing at least from picking up of the annular object to winding of the film around the annular object and its moving space are required. Since the space is provided using the space above the line, about half of the space required for this type of packaging machine can be developed in the vertical direction. Therefore, the planar space required for the arrangement can be reduced, and it can be easily attached to an existing line, and the line does not have to be restricted as a line dedicated to shrink wrapping.

According to the second aspect of the present invention, it is not necessary to divide the heat treatment for the film into the preliminary heat and the main heat, and the heat treatment is completed at once, so that the processing speed can be increased accordingly. , The structure can be simplified.

According to the third aspect of the invention, it is possible to reliably prevent a thermal trouble from occurring in the operation of the holding hand.

According to the fourth aspect of the present invention, the processing speed can be increased, the tact of the entire line can be easily adjusted, and the hand mechanism can be protected from thermal damage.

According to the fifth aspect of the present invention, since the number of parts arranged above the conveyor is further increased, the planar space required for the arrangement can be further reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a shrink wrapping machine for a wire roll according to an embodiment of the present invention.

FIG. 2 is a schematic front view of the wire roll shrink wrapping machine shown in FIG.

FIG. 3 is a front view of an essential part viewed from line AA in FIG. 1;

FIG. 4 is an enlarged sectional view taken along line BB of FIG. 1;

FIG. 5 is a perspective view in which a main part of a film hanging and conveying unit in the wire roll shrink wrapping machine shown in FIG. 1 is partially cut away and enlarged.

FIG. 6 is an enlarged front view of a hand mechanism (primary hand mechanism) of a film hanging and conveying unit in the wire roll shrink wrapping machine shown in FIG. 1;

FIG. 7 is an enlarged right side view of a heating and conveying unit of the wire roll shrink wrapping machine shown in FIG.

FIG. 8 is an enlarged perspective view of a main part of a heating and transporting unit in the wire roll shrink wrapping machine shown in FIG.

9 is a side view in which a hand mechanism (secondary hand mechanism) of a heating and conveying unit in the shrink wrapping machine for a wire rod shown in FIG. 1 is partially cut and enlarged.

10 is an enlarged rear view of a hand mechanism (secondary hand mechanism) of a heating and transporting unit in the wire roll shrink wrapping machine shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shrink-wrapping machine of cyclic | annular material 9 Conveyor 11 Film supply part 15 Heating part 17 Cylindrical substance 19 (At least 1) hand mechanism 19 'Tertiary hand mechanism 23 Holding hand 25 Film 31 Secondary hand mechanism 33 Traveling chain 37 (Secondary hand) Mechanism) holding hand 45 trajectory 55, 59 attitude switching means 69 holding hand advance / retreat means 119, 139, 143 holding hand opening / closing means 121 resilient means

Claims (5)

[Claims] 1. A trajectory extending parallel to a conveyor for transporting an annular object is provided, and a film supply unit for supplying a film to be wound around the annular object and a heating unit for shrinking the wound film are provided beside the conveyor. At least one hand mechanism that is arranged so as to be arranged in a parallel direction and detachably holds the annular object is supported on the track so as to move above the conveyor, and the hand mechanism is arranged in a radial direction from a central axis. Holding hand that is opened and closed, holding hand advance / retreat means for moving the holding hand in the direction of the central axis, and a vertical attitude in which the central axis extends vertically and a horizontal attitude in which the central axis extends laterally. And a posture switching means for switching between the first and second holding hands when the holding hand is in a vertical posture when the annular object to be shrink-wrapped is conveyed. After holding the ring by inserting and opening, the holding hand is pulled up and switched to the horizontal position, the ring is set to the standing position and moved to the side of the conveyor, and the hand mechanism is moved along the track in this state. A shrink wrapping machine for an annular material, wherein the film is wound around at least the annular material. 2. A shrink wrapping machine for an annular object according to claim 1, further comprising a secondary hand mechanism passing through a heating unit, separately from the hand mechanism on the track, and keeping the film-hung annular object in a standing posture. A shrink wrapping machine for an annular object, which is received by a secondary hand mechanism. 3. The shrink wrapping machine for an annular object according to claim 2, wherein the holding hand of the secondary hand mechanism is constantly urged in an opening direction by a resilient member to open and close the holding hand of the secondary hand mechanism. A shrink wrapping machine for a circular object, characterized in that holding hand opening / closing means for each are arranged outside the entrance and exit of the heating unit. 4. A shrink wrapping machine for an annular object according to claim 2, wherein a plurality of secondary hand mechanisms are attached to an endless traveling chain extending in a direction parallel to the conveyor, and an upper traveling path of the traveling chain. A shrink wrapping machine for an annular object, characterized in that only the heat is passed through a heating section. 5. A shrink wrapping machine for an annular material according to any one of claims 2 to 4, wherein a tertiary hand mechanism for receiving the annular material passed through the heating section and lowering the annular material on the conveyor is arranged above the conveyor. A shrink wrapping machine for annular products.