JP2002347706A - Arch structure of automatic packing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arch structure of an automatic packing machine which has a wider lateral movement of an arch than the width of a band when removing the band, secures charging of the band to the total length of a band introduction groove even with twist or wind at the end of the band, and secures removement of the band from the band introduction groove. SOLUTION: A band introduction groove 5 which openes at side surface is formed on an arch 2, an arch cover 8 facing to an opened surface of the band introduction groove 5 of the arch 2 is raised and fixed, lower parts on both sides of an arch frame 6 fixed on the outside of the arch 2 so as to move integrally therewith are supported by guide mechanisms 7 for guiding the lateral movement of the arch 2, to the arch 2 and the arch frame 6 a spring force in a direction constantly returning to a position where an opening of the band introduction groove 5 are closed with an opposing arch cover 8 is urged by coil springs 24 held in compression between opposing surfaces of the arch frame 6 and the arch cover 8, and the arch frame 6 is interlocked with a lateral movement mechanism 14 of the arch 2 to laterally move the arch 2 greater than the width of the band, so that the band is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic packing machine in which a package is wound with a thermoplastic band and both ends of the band are welded together, and an arch structure for arranging the band around the package. About.

[0002]

2. Description of the Related Art An automatic packing machine for packing a package by winding it around with a thermoplastic band is widely used for packing work. For example, an automatic packing machine for guiding a band which is cut off at a lower portion on a table is used. An arch is provided upright, and a band cutting and welding mechanism and a band sending / retracting mechanism on the side of the sled are provided at a position between both ends of the arch on the table. Supply the band into the guide groove from the part, and with the package placed on the table, clamp the tip end of the band coming out from the entrance end with a cutting welding mechanism, and remove the band from the band guide groove of the arch. The band is detached, the band is wound back by pulling back the band by the feed-out and pull-back mechanism, and thereafter, the band is cut and both ends are welded by the cutting and welding mechanism.

In a conventional automatic packing machine, a mechanism for detaching a band from a band guide groove of the arch is as follows.
A band guide groove was provided in the arch fixedly arranged on the table so as to open on the inner peripheral surface of the arch, and this opening was elastically closed by an opening / closing lid so that it could be opened and closed. The band is configured to be detached by pushing and opening the open / close lid.

[0004] In the above-mentioned automatic packing machine, a recent band mainly uses a narrow band having a width of 5 mm.

[0005]

However, when a narrow band is guided by the above-described conventional band guiding structure of an arch, there are the following problems.

A) When the band guide groove is narrowed to match the width of the band, the width of the opening / closing lid is also narrowed, and the mounting structure for opening and closing the band guide groove becomes complicated.

B) When the band is removed from the band guiding groove, the opening and closing cover is pushed and opened by the band. However, since the band is narrow, pushing and opening the opening and closing cover directly by this band means that the band moves laterally. Occurs and interferes with the band guiding groove,
The separation of the band from the guide groove is hindered.

C) If there is a gap between the opening of the band guide groove and the opening / closing lid that closes the band, the fed band may fall out of the gap due to twisting or meandering of the band tip, and the entire length of the band guide groove. Occurs when the band cannot be supplied.

Therefore, an object of the present invention is to provide a band guiding groove so as to open on the side surface of an arch, and to move the arch laterally beyond the band width when detaching the band. An object of the present invention is to provide an arch structure of an automatic packing machine capable of reliably filling a band with twisting or meandering at the end of the band, and reliably removing the band from a band guiding groove.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a band-guiding arch, which is cut off at a lower portion, provided on a table in an upright shape, and the entrance side of the arch is provided. After supplying the band into the band guiding groove from the end and clamping the tip end of the band coming out from the entry side end, the band is detached from the band guiding groove of the arch, and the band is wound by pulling the band back. In the arch structure of the automatic packing machine, in which the band is cut and the both ends are welded thereafter, a band guide groove opening on one side is formed in the arch, and the band guide groove of the arch is formed on the table. The arch cover facing the surface to be opened is fixed upright, and the lower part on both sides of the arch frame fixed so as to move integrally with the outside of the arch is supported by a guide mechanism for guiding lateral movement of the arch. A spring contracted between the arch and the arch frame between the opposing surfaces of the arch cover to urge the elasticity in a direction in which the opening of the band guide groove always returns to a position closed by the arch cover facing the arch cover. The configuration adopts a configuration in which the frame is interlocked with a mechanism for imparting lateral movement of the arch.

Here, a guide mechanism for guiding the lateral movement of the arch is supported by a guide shaft having a polygonal cross section fixed horizontally to a lower portion of the arch frame and capable of moving the guide shaft in the axial direction. , Can be formed with multiple grooved rollers and bearings attached to the table side,
The arch can be a single continuous article without any seams, and a metal such as aluminum or a synthetic resin can be used as the material of the arch.

The surface of the arch where the band guide groove is opened can be closed with no gap by pressing the arch against the arch cover by a spring. Does not protrude to the outside, the band can be filled with respect to the entire length of the band guide groove, and the band can be detached from the band guide groove only by moving the arch laterally larger than the band width. The structure can be simplified.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the structure of the main part of an automatic packing machine according to the present invention. In FIG. 1 and FIG. As is known, a band cutting and welding mechanism 3 and a band sending / retracting mechanism 4 on the side thereof are provided at a position between both ends of the arch 2 on the table 1. A band is supplied into the band guide groove 5 from the entry side end of the arch 2 and the package is placed on the table 1. In this state, the package is placed on the table, and when the start switch is turned on, the arch is turned on. 2 is clamped by the cutting and welding mechanism 3 on the leading end of the band coming out from the exit side of the band 2, and then the band is detached from the band guiding groove 5 by the lateral movement of the arch 2, and the band is pulled back by the feed-out and withdrawing mechanism 4. Wrap the package with , And performs welding of cutting both ends of the band in the cutting welding mechanism 3 after this.

As the arch, as shown in FIG. 3, a single continuous seamless material having a rectangular frame shape and four arcs at its four corners can be adopted. The material of the arch 2 is steel, aluminum or the like. The arch 2 is provided with a band guiding groove 5 that is open on one side surface over the entire length.
For example, the width (depth) is 10 to 12 mm and the thickness (opening width) is 3 mm so that a narrow object having a width of 5 mm can be guided with a margin.
Set to about.

A lower part of both sides of an arch frame 6 fixed to move outside the arch 2 is supported by a guide mechanism 7 for guiding a lateral movement of the arch 2 as shown in FIG. An arch cover 8 facing the surface where the second band guide groove 5 opens is fixed upright.

The arch frame 6 has a purpose of maintaining the shape of the arch 2, preventing aging, and imparting rigidity. As shown in FIG. 5, the upper frame 6 a using an L-shaped member and the vertical bars 6 on both sides are used.
b and a horizontal lower rail 6c using a flat bar at the lower end of both side vertical rails 6b are formed into a rectangular frame of a lower separation that is fitted to the arch 2 from the side opposite to the opening surface of the band guide groove 5. The arch 2 and the arch frame 6 are integrated by screwing each straight portion of the arch 2 to the upper rail 6a, the vertical rail 6b, and the lower rail 6c.

In fixing the arch 2 to the arch frame 6, a portion of the arch frame 6 for screwing the arch 2 is formed in a long hole 9 along the width direction of the arch 2. The position of the arch 2 can be adjusted in the width direction so that the surface of the arch 2 where the band guide groove 5 opens can be securely closed by the arch cover 8 described above.

To move the arch 2 laterally, guide mechanisms 7 provided on both lower sides of the arch frame 6 have a hexagonal cross section fixed to the lower part of the arch frame 6 at a right angle to the arch frame 6 so as to be horizontal. And a mounting shaft 11 fixed to the frame of the table 1 at a position corresponding to both ends of the above-mentioned guide shaft.
And a guide shaft 10 for supporting the shaft 0 from below.
The arch frame 6 and the arch 2 fixed thereto are larger than the width of the band by the guide shaft 10 which is formed by the bearing 13 which presses the upper part from above, and is supported by the grooved roller 12 and the bearing 13 so as to be movable in the axial direction. Large lateral movement is possible.

As the guide shaft 10 having a hexagonal cross section, the grooved roller 12, and the bearing 13 used for forming the guide mechanism 7, commercially available products can be used as they are, and the number of components can be reduced. There is an advantage that the durability, rigidity and reliability of the guide mechanism 7 can be achieved at low cost.

Further, as shown in FIGS. 1, 2 and 5, a lateral movement imparting mechanism 14 for imparting a lateral movement to the arch is provided by a support frame 15 on which a band cutting and welding mechanism 3 is mounted. 2, the cam 17 is fixed to the end of a cam shaft 16, and the lower part of a rod 18 disposed immediately above the cam 17 is pivoted to a support frame 15 by a fulcrum shaft 19. The upper end of the rod 18 is engaged with a pin 20a fixed to the lower part of the lower rail 6c of the arch frame 6 by a bracket 20, and the rod 18 is stopped.
The cam follower 21 pivotally fixed to the lower end of the cam 17 is in contact with the outer surface of the cam 17.

The camshaft 16 is rotated in synchronization with a drive source for operating the band cutting and welding mechanism 3 and in synchronization with the band cutting and welding step. As shown in FIG.
4A, the arch 2 is in a phase in which the band guide groove 5 is closed by the arch cover 8 and the cam 17 is rotated so that the higher part is the cam follower. When pushing up 21, rod 1
8 tilts counterclockwise in FIG. 2 about the fulcrum shaft 19, and the lower beam 6c of the arch frame 6 is moved in this tilting direction.
As shown in (B), it moves to the left side.

The arch cover 8 is formed by combining a front cover 8a and a rear cover 8b using an L-shaped member in a front and rear direction, and is formed in a downward U-shaped frame in which the arch 2 and the arch frame 6 are accommodated with a margin. , Table 1 on both lower ends
By being fixed on the table 1, it is placed upright on the table 1, the band guide groove 5 of the arch 2 faces the vertical wall of the rear cover 8 b, and the band guide groove 5 is closed by the vertical wall of the rear cover 8 b. It has become so.

At each corner of the arch 2, a pin mounting hole 22 penetrating in the width direction of the arch 2 and communicating with the band guiding groove 5 is provided in a portion exposed from the corner of the arch frame 6. The band A is securely removed from the band guide groove 5 through the hole 22.
Arch pin 23 for guiding horizontal movement of arch 2
Is movably inserted from the side opposite to the opening surface of the band guide groove 5, and a reaction force is applied between the head of the arch pin 23 and the arch 2 such that the arch pin 23 abuts on the front cover 8 a of the arch cover 8. In the arch 2, a conical coil spring 24 for urging elasticity in a direction of constantly moving to the position where the opening surface of the guide groove 5 is closed by the rear cover 6b is contracted.

The length of the arch pin 23 is shown in FIG.
The phase of the arch 2 is a phase in which the opening surface of the guide groove 5 is closed by the rear cover 8b, and is set to a length such that the tip faces the inner wall of the band guide groove 5 and does not protrude into the band guide groove 5. The pin mounting hole 22 is set to an inside diameter that allows the arch pin 23 to move in the axial direction, and the portion of the pin mounting hole 22 that overlaps the band guide groove 5 is formed by a counterbore 25 as shown in FIG. 23 is slightly larger than the outer diameter.

Therefore, when the lower part of the arch frame 6 is given a lateral movement by the lateral movement giving mechanism 14, the arch 2
The arch 2 is laterally moved in parallel with the arch pin 23 in contact with the front cover 8a as a guide, and the diameter of the arch pin 23 is made equal to or slightly larger than the opening width of the band guiding groove 5, whereby the arch 2 is closed. When the band A moves laterally from the position, the band A in the band guiding groove 5 is prevented from moving integrally with the lateral movement of the arch 2 at the tip of the arch pin 23, thereby ensuring that the band A is moved out of the band guiding groove 5. Can be removed.

By the way, the arch 2 is moved horizontally in parallel as a whole, and the opening of the band guiding groove 5 is closed by using the band A having a small width to achieve zero clearance. It is necessary to prevent A from jumping out of the gap due to twisting or meandering of the tip.

In the case where the arch 2 is formed as a continuous single piece, regardless of its material, bending of the corner causes springback, and in forming by heating, the pin mounting hole 22 due to residual stress after cooling, aging, etc. When the pin mounting hole 22 is guided by the arch pin 23 fixed to the arch cover 8, the positional dimensional relationship between the four corners of the pin mounting hole 22 may vary. When the arch 2 moves sideways,
A large frictional resistance is generated between the arch pin 23 and the pin mounting hole 22, and a strong lateral movement applying mechanism 14 is required for the lateral movement of the arch 2.

On the other hand, in the present invention, since the arch pin 23 is merely pressed against the front cover 8a by the coil spring 24, the arch pin 23 is moved in the direction in which the positional relationship between the four corners of the pin mounting hole 22 fluctuates. It can be freely moved, thereby effectively preventing an increase in frictional resistance between the arch pin 23 and the pin mounting hole 22.

Further, the portion of the pin mounting hole 22 on the side overlapping the band guide groove 5 is slightly larger than the outer diameter of the arch pin 23 by the counterbore 25 so that the band in the band guide groove 5 can be moved. The frictional resistance between the arch pin 23 and the pin mounting hole 22 can be reduced without hindrance, and the band A can be reliably separated from the band guide groove 5 by the arch pin 23.

With such a configuration, the arch 2 can be moved laterally smoothly with a small force, and the lateral movement imparting mechanism 14 can be used.
There is an advantage that it is not necessary to require rigidity in the structure of (1).

The arch 2 is urged by the coil spring 24 to be urged to press against the rear cover 8b.
In addition, since it is attached to the arch frame 6 so as to be position-adjustable within the range of the elongated hole 9, the entire surface of the opening of the band guide groove 5 can be closed with no gap. FIG.
When there is a gap a between the opening surface of the band guide groove 5 of the arch 2 and the rear cover 8b, the narrow and thin band A protrudes outside from the gap a.

When the arch 2 is made of a synthetic resin having a small coefficient of friction, there is an advantage that the sound generated when the band runs can be reduced. However, since the band runs at high speed, the band is thin, thin and hard. The side of the band guide groove 5 of the arch 2 may be cut off by the edge of the arch 2.

In order to prevent this, as shown in FIG. 8, slits 26 and 27 continuous with the band guiding groove 5 are provided at both ends of the arch 2 on the entrance side and the exit side of the band A.
Band guide plates 28 and 29 hardened by heat-treating the steel are fixed in 6 and 27 so that the band A does not directly contact the side surface of the band guide groove 5 on the entrance side and the exit side of the arch 2. Thereby, the band guiding groove 5 can be effectively protected.

The band guide plates 28 and 29 have a plane shape in which a portion corresponding to the entrance side of the band A is inclined, and the band guide plates 28 and 29 are long lengths used for fixing to the arch 2 with screws. The hole 30 allows the position of the band guide groove 5 to be adjusted in the width direction so that it can be used as a band width adjusting bracket.

The arch structure of the present invention has the above-described structure. Before packing, the cam follower 21 falls into the concave portion of the cam 17 as shown in FIG. 2, and the arch 2 is rearward as shown in FIG. The opening of the band guide groove 5 is closed by being pressed against the cover 8b, and the band A supplied into the band guide groove 5 from the entry side end of the arch 2 by the sending-out operation of the feed-out / retraction mechanism 4 is moved to the band guide groove 5 Of the band A which has been loaded over the entire length of the band A and has come out from the end on the exit side, and stops in a state where the tip detection switch is pressed.

When the start switch is turned on with the package placed on the table 1, the cutting and welding mechanism 3 is first turned on.
4A, the cam shaft 16 of the lateral movement applying mechanism 14 is rotated, and the arch 2 compresses the coil spring 24 to exceed the width of the band A as shown in FIG. Laterally, the band A is moved from the arch 2 to the arch 2 at each corner of the band guiding groove 5.
The band A is securely separated from the band guiding groove 5, and the band A is suspended in the air.

Subsequently, the feeding and retraction mechanism 4 is tightened, and the band A, which has been wound around the package by pulling the band A back, is tensioned, the cutting and welding mechanism 3 is operated, and the clamp and the band A in the middle of the band A are operated. In the middle of the process, the heater enters between the upper and lower bands A, melting of the opposing surface of the band A by pressing the upper and lower bands A across the heater, welding of the heater and welding of both ends of the band A by pressing the upper and lower bands A Are carried out in order, and the package in which the package is wound with a band is completed.

As a result, the camshaft 16 makes just one rotation, the cam follower 21 falls into the recess, and the arch 2 is laterally moved in the return direction by the movement applied by the lateral movement applying mechanism 14 and the pressing of the coil spring 24, and the band guide groove is formed. 5 is pressed against the rear cover 8b to close the opening of the band guiding groove 5,
The feed-out and retraction mechanism 4 operates to send out the band A
Is supplied over the entire length of the band guide groove 5 from the entry end of the arch 2, and the tip of the band A presses the tip detection switch of the cutting and welding mechanism 3 to stop the entirety and prepare for the next packing. become.

[0040]

As described above, according to the present invention, the band guiding groove is provided so as to open on the side of the arch, and this opening is closed by the arch cover, and when the band is detached, the arch is extended beyond the band width. As the band is moved, the opening of the band guide groove can be closed close to zero, and the entire length of the band guide groove can be completely filled with the band even if the band tip is twisted or meandered. Even if a narrow band is used, it will not jump out.

Also, when the band is detached, the arch is moved laterally more than the band width.
The band can be securely removed from the band guide groove, and the guide mechanism for guiding the lateral movement of the arch is formed by a guide shaft with a polygonal cross section, a grooved roller, and a bearing, so that a commercially available product can be used. It can be used, and the number of components can be reduced, and the durability, rigidity and reliability of the guide mechanism can be achieved at low cost.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing the structure of the main part of an automatic packing machine according to the present invention.

FIG. 2 is a longitudinal sectional side view of the above.

FIG. 3 is an exploded perspective view showing the structure of an arch.

FIG. 4A is a longitudinal sectional view showing a phase in which a band guide groove of an arch is closed by an arch cover, and FIG. 4B is a view showing a phase in a lateral movement state of an arch in which a band guide groove is opened and a band is detached. Longitudinal section

FIG. 5 is a perspective view showing an arch frame, and guide mechanisms and lateral movement mechanisms provided at lower portions on both sides thereof.

FIG. 6 is an enlarged sectional view showing a case where a gap is generated between a band guide groove of an arch and an arch cover.

FIG. 7A is a cross-sectional view showing the relationship between a pin mounting hole of an arch and a counterbore, and FIG.

FIGS. 8A and 8B are cross-sectional plan views showing the mounting structure of the band guide plate at both ends of the arch in an enlarged manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Table 2 Arch 3 Cutting welding mechanism 4 Sending out and pulling back mechanism 5 Band guide groove 6 Arch frame 6a Upper rail 6b Vertical rail 6c Lower rail 7 Guide mechanism 8 Arch cover 9 Slot 10 Guide shaft 11 Mounting block 12 Slotted roller 13 Bearing 14 lateral movement imparting mechanism 15 support frame 16 cam shaft 17 cam 18 rod 19 fulcrum shaft 20 bracket 20a pin 21 cam follower 22 pin mounting hole 23 arch pin 24 coil spring 25 counterbore 26 slit 27 slit 28 band guide plate 29 band guide plate 30 long Hole

Claims (3)

[Claims] 1. A band guiding arch, which is cut off at a lower portion, is provided upright on a table, a band is supplied into a band guiding groove from an entrance end of the arch, and a band is supplied from an entrance end. After clamping the tip of the band that came out, remove the band from the band guide groove of the arch, pull back this band, tighten the package, then cut the band and weld both ends automatically In the arch structure of the machine, a band guiding groove opening on one side is formed in the arch, and an arch cover facing the surface on which the band guiding groove of the arch opens is fixed on the table, and the arch cover is fixed outside the arch. The lower part of both sides of the arch frame fixed to move together is supported by a guide mechanism for guiding the lateral movement of the arch, and between the arch and the arch frame, between the opposing surfaces with the arch cover. The contracted spring urges the elasticity of the direction in which the opening of the band guide groove always returns to the position where the opening is closed by the facing arch cover, and the arch frame is interlocked with the arch lateral movement applying mechanism. Arch structure of automatic packing machine. 2. A guide mechanism for guiding a lateral movement of the arch, a guide shaft having a polygonal cross section fixed horizontally in a lower portion of the arch frame, and supporting the guide shaft so as to be movable in an axial direction. The arch structure of the automatic packing machine according to claim 1, wherein the arch structure is formed by a plurality of grooved rollers and bearings attached to the table side. 3. The arch according to claim 1, wherein the arch is formed of a single continuous piece.
The arch structure of the automatic packing machine described in.